Inner and outer Electric Bikes gear shift

Prior to know them, it is necessary to know the concept of the internal gear and the external gear . Simply put outside the transmission gear means mounted on the outside of the Three wheel bikes bicycle exists as a separate part , and the inner gear is hidden in the rear hub represents the concealed parts.
Presented directly outside the outer gear , direct contact with the external space. The speed but hidden inside is not in direct contact with the outside space. Thus, due to the design of outer space becomes larger , have greater speed range , used mountain bike . However, due to exposure and rain , dirt , oil , etc., so care must be regularly cleaned , and do not in the periodic maintenance of the shift , but the shift in the Womens mountain bikes design due to the limited space , so the more limited speed range , typically used in the city the riding light trucks as much.

Durable Performance Electric Tricycle

Can be divided into two aspects of internal and exterior . Inherent durability required to ensure a certain degree of structural strength requirements for some of the wear parts such as front, middle and rear axle gear bowl, flywheel chainrings , chain roller and the Folding bicycle borders of the bases , and the foot brake parts, etc. , carburizing heat treatment to improve the surface hardness. Appearance and durability against corrosion is increased aesthetic appearance by plating and coating ( paint ) . Electroplating is the steering wheel rim such as the original metal surface plated with copper , nickel, chromium or nickel, nickel, chromium metal plating layer 3 is also visible rust properties and resources required to select the other layer. Some minor small parts , then the use of bright galvanizing Electric Bikes process . Painting is the use of high-voltage electrostatic method, the frame, fork surface coating. Paint surface to plump , gorgeous , and has some rust resistance and paint adhesion.

What frame is ?

Frame equivalent to the human Electric Bicycles skeleton , with the frame to put on a variety of bicycle parts . A frame made ​​of iron , aluminum and other materials, according to the angle of the length of the pipe , etc. affect the characteristics of the overall configuration of the Electric Tricycle bicycle . For example , a good bike ride straight , easy to turn the bike , comfortable riding bicycles , many of these factors are decided from the frame.

What is the lead-acid battery works?

A lead-acid battery is the most widely used cell, which lead to the negative electrode of spongy lead dioxide as a positive electrode, these two substances we called the active substance with an aqueous Three wheel bikes solution of sulfuric acid as the electrolyte, which participate in the battery electrochemical reaction.
Chemical reaction follows the principle of lead-acid batteries
Negative reaction: Pb + HSO4-PbSO4 + H + +2 e
Cathode reaction: PbO2 +2 e + HSO4-+3 H + PbSO4 +2 H2O
Electrode reaction: PbO 2 +2 H + +2 HSO 4 - + Pb 2Pb 2 SO 4 +2 H 2 O
The state of charge and discharge status: You can see from the reaction principle, at the time of discharge, both positive and negative material with sulfuric acid electrolyte lead sulfate reaction, so called "double-sulfation reaction." Under normal circumstances, lead sulfate generated loose structure, and the crystals are very small, very high Electric Bicycle electrochemical activity, such activity a high lead sulfate can be regenerated lead dioxide positive electrode and the negative electrode during charging at a current action the spongy lead. By this stable reversible process, and the battery power to achieve the release of stored energy effects.

Electric tricycle motor and controller to match the power of the principle of power

Conventionally, electrical system load power is generally defined as 75% of the power control part , that when the motor controller to choose optional 350W 500W, this configuration ensures that the vehicle is very low failure rate . Most manufacturers 350W motor controller is also used 350WW, even 500W motor controller also use 350W; Some controller manufacturers 350W controller marked as 500W, to create the illusion of manufacturers . As the electric tricycle pull people up the goods , the load Adult tricycle is much larger than the electric bike and overload phenomenon occurs frequently, because the proportion of damage caused by the irrational support will be greatly increased . 6 , the electric tricycle battery capacity and the parameters of the controller ? Electric tricycle battery capacity is mainly concerned with the current limit controller , battery 25A maximum current limit controller with the capacity of 20 Ah to 18 ~ 20A for the best. Battery 35A maximum current Electric Bikes limit controller with 36 Ah to 22 ~ 27A for the best. Battery 45A maximum current limit controller with 45 Ah to 30 ~ 35A for the best. On the battery 60 with the maximum time -limit controller 60A to 40 ~ 45A is preferred. Battery 120A maximum current limit controller with 120 Ah to 80 ~ 100A for the best. Because SACS governor did not limit, the maximum current up to 100A or more, so can not be selected when the battery capacity is small , otherwise an undervoltage use will not go . Permanent magnet brush motor is best not to use the series excitation governor , motor burn easily , but also volatile magnetic .

Bicycle use low alloy steel pipe manufacturing

In order to reduce the pipe weight, increase strength, higher-end bikes with low alloy steel pipe manufacturing . In order to reduce the resistance of fast-moving , and some bike also features a streamlined steel . Spoke is generally equal diameter , in order to reduce the gravity , and made ​​both ends of a large middle small adjustable spokes , as well as to reduce the air resistance will be made ​​of flat spokes streamlined
1 , tire : soft edges of tires and tire two kinds of hard edges . Soft side tires wider cross-section , can all be wrapped around the tube , a relatively large area that can fit a variety of roads . Hard-edged tires , light weight, small size suitable for the ground Folding bicycle running on a flat road , with little resistance , the advantages of traveling light . The tread pattern is designed to increase the friction with the ground . Mountain bike tire width particularly wide , deep tread also accommodate off-road mountain with .
2 , the step parts : the left and right foot support member mounted on the axis of the crank member, the power level is converted to a rotational force of the apparatus , when riding a bicycle , the pedal force is transmitted to the first pedal member , and the pin pedal crank shaft , the central axis , the chain flywheel, rotate the rear wheel , so that the bicycle forward. Therefore, the structure and size of the pedal part is appropriate , will directly affect the rider's position is appropriate to put the foot , bicycle drive can proceed smoothly .
 Foot : can be divided into integral Cargo bike and modular foot pedal . No matter what style of foot pedal surface must have to be safe and reliable, has a non-slip performance , you can use a rubber , plastic or metal materials . Pedal must be flexible rotation .
3 , fork components:
Turn the handlebar and fork , you can change the direction of the front wheels , has played a guiding role of the bicycle. In addition, you can also play the role of controlling a bicycle traveling .

German motorcycle market

In 1921, BMW began producing motorcycle cylinder engine; 1923, BMW aircraft designer Marcos. Fritz opened a prelude to production motorcycles. 500ml engine mounted in the frame, extending to both Folding electric bikes sides of the cylinder, this simple and efficient design are still in use. BMW motorcycle with sophisticated manufacturing technology and high prices famous. Sales in the automotive field has a market rules, a car is a good sale, see German reaction to it will know, this rule also applies in the Cargo bike motorcycle market. BMW to exceptional quality world-renowned for its motorcycle fleet ritual in many countries chosen Ambassador to clear the way models. BMW is characterized by many ultra-high-tech electronic products, it is no wonder Honda Gold Wing to plagiarize it.

Low static Adult tricycle products with structure

Low static air hoist products with a compact , lifting single , two-speed , high- efficient lifting stroke , smooth running characteristics , wide application , particularly low static air hoist can effectively enhance the travel height in the new plant , the low static empty hoist lower building height, lower construction costs, performance and CD1, MD1 same products .
Low static air hoist features and benefits are:
1, the best headroom than ordinary CD hoist lifting height can raise 200 ~ 500mm
2 , excellent three- drive electric trike technology , lifting gear made ??of high quality alloy steel , triple reduction , smooth operation , long life, reliable performance, avoids many of the disadvantages of the intermediate shaft hoist CD drive long distances .
3, the motor has excellent overall performance. The new self-cooling motor is specially designed tapered motor , the motor housing is a good thermal performance of cast aluminum alloy materials , electrical insulation class F, protection class IP54, motors are higher than normal level .
4 , according to user requirements to: gourd running , lifting single and double speed or frequency stepless control , remote  Folding electric bikes operation , overload protection, motor overheat protection and other features.
5, the agency delicate , beautiful appearance, has many unique and innovative ;
         ( 1 ) , the main hoist cable without leakage throughout the cables are arranged by various means in the hoist internally so hoist more beautiful appearance ; such as: supporting shaft is hollow thick-walled steel pipe, under the premise of ensuring the intensity of use , reducing the overall weight of the hoist , hoist around and through it to achieve the passage of cables .
         ( 2 ) , hoist structure is compact, with a weight of counterweight box , the user can add a variety of scrap steel or stone , etc. , saving steel, while low- weight compared with static air hoist reduced dimensions ;
         ( 3 ) , hoist operation, both sides of the hexagonal steel wheels through a torque transmission , transmission torque, high reliability , to avoid the situation of flat key shear failure , and this transmission is beneficial to run part of the gourd installation and adjustment .
         ( 4 ) , lifting the host portion of the housing is rectangular welded structure, surrounded by mounting bolt holes are highly versatile , can be converted into a fixed or courier hanging electric hoist trolley , and 360 ° out of rope .

Support brakes and a safety brake

Hoisting mechanism is configured with two supporting brakes and a safety brake . The first stage is a conical rotor brake motors that work magnetic pull brake , reducer enter the second stage of the installation head dry friction brake to prevent the first stage of brake failure and will continue to make normal load lifting system action . Safety brake is safe brake emergency braking device installed on the reel assembly, under the agency fails to prevent the transmission can be damaged emergency safety electric trike emergency brake drum braked to prevent accidents caused by falling loads .
1 , the upper limit position of the secondary limit device . The first is the conventional electric hoist , lower travel stop limit , the second is heavy vertical limit .
2, the host heat radiation protection, under the sub- ah roll shell fitted with electric hoist machine installed insulation panels, sheet metal folder filled with two high temperature asbestos material to  Folding electric bikes isolate the radiation temperature of molten metal .
3 , lifting the motor and run the motor using H -class insulation class and built- in lifting motor winding overheating protection device.
4 , rope using 6 × 37S + IWR-GB8918-2006 uses high-strength high temperature resistant wire rope is important .
5, the electrical control device to set the zero -voltage protection , voltage protection , phase protection boxes overcurrent protection , control equipment cables using ZR +-YCP group fired heavy rubber cables.
6, the control method using remote control , also can be centrally controlled .

Product Overview and Electric Tricycle

1, the charger for the LLC resonant topology , using the non-linear control technology company independent invention , with high efficiency, low harmonic , long life , high reliability , its performance reached the international advanced level ;
2 , charging machine for open type WET and sealed VRLA (GEL / AGM) lead-acid batteries ;
Charging can be widely used in rechargeable electric forklifts , electric golf carts, electric sightseeing cars, electric patrol car , electric boats, electric cars and other electric vehicles and vessels clean .
Second, the product features :
A microcontroller Folding electric bikes on lead-acid battery ( group ) tolerance current capability , life curve , gassing and other information points automatically charging the whole process ;
2, with ambient temperature compensation to ensure that the temperature of the applicability of weather conditions , and can automatically resist " overcharge " and "less filling " ;
3, with pulse charging function, optimal Three wheel bikes life under the premise of ensuring its full ;
4 , there Manual " equalize" function ;
5 , the product of "three" paint handling and "dust " designed to improve the operational reliability ;
6, the product has a " significant number " function , you can display online charging current , charging voltage and charging time.

Womens mountain bikes

Electric car battery provides energy lorry energy , electric cars mainly uses a combination of lead-acid batteries . Cargo bike nickel-metal hydride batteries and lithium-ion batteries also have some lightweight folding electric car to use.
Tips: main control circuit board for the electric vehicle owners , with a large current, the larger the heat will be issued . Therefore , the electric car not parked in direct sunlight , and avoid Folding electric bikes , [Note ] Do not pour the water in order to avoid a controller failure .
1 . Lower than the market average wholesale price determined not to buy batteries .
2 . Not more than two years after the market test of the product .
3 . No electric car battery with car manufacturers are determined not to buy it.
4 . Expensive batteries, if not large production , determined not to buy .
5. Changes in national standard-sized batteries determined not to buy .
6.5A discharge , 30 seconds when the voltage is higher than 12.68V is determined not to buy more than 90 % of the short-lived batteries.
The easiest way to detect the battery : 5A discharge voltage is below 12.63 and 30 seconds , three minutes before the voltage rise, not fall , but rise more, the better the quality.

Electric Bicycle

Refers to the battery as an auxiliary energy on the basis of ordinary bicycle , the installation of the motor , controller, battery , turn the gates to manipulate the components and electrical Folding electric bikes systems integration and display personal transport. Electric bicycles, refers to the battery as an auxiliary energy, with two wheels , to achieve human riding , electric or electric -assisted bicycles special features . According to the State in 1999 to develop common standards for the relevant Cargo bike designed maximum speed , empty mass , dimensions , and non-motor electric bike attribution management areas , should also have the following five characteristics: the function must have the foot traffic , the battery only as a auxiliary energy ; must have two wheels ; design speed of not more than 20 km / h ; vehicle weight of not more than 40 kg ; tire width ( in the womb ) is not greater than 54 mm .
Electric bicycle models with TD ( special kind of electric bicycles bike category ) crown numbers. Although it is characterized by the appearance (or even the appearance of features with a motorcycle ) with an ordinary bicycle , but the main thing is that it is based on an ordinary bicycle , the installation of the motor , controller, battery , turn the steering components such as brake handle and display Electrical and instrumentation systems integration, personal transportation .

VRLAB Common Electric Tricycle and Solutions

With the continuous development of technology, VRLA batteries have been widely used, it is a sealed battery maintenance in the operation of a small amount for the safe operation and maintenance of substation provides a reliable protection , get the overwhelming majority of operation and maintenance personnel. But VRLAB to run convenience , but also difficult to observe and maintain , in recent years, the use of the situation, Cargo bike VRLA batteries run effect is not ideal . Based on the DC system in recent years, a number of substations and battery maintenance statistics , analyzes VRLA batteries during operation the problems , develop solutions , and achieved good results in practical applications . VRLA batteries substation Problems After extensive use of VRLA batteries , after a period of operation , there has been decreased capacity , Lou Ye , abnormal voltage , the entire group of scrap and Folding electric bikes kinds of problems, resulting in the main reasons for this problem are: understanding the problem in the use of VRLA the beginning , the majority of sales personnel and maintenance personnel referred to as maintenance-free batteries , so that in the installation , commissioning , operation and maintenance of such batteries in the as completely maintenance free , never observed , adjustments and so on run after installation .

Large CNC crankshaft grinder cut Battery powered bikes static and dynamic performance analysis measuring device

In the various components of the crankshaft grinding wheel frame , the measuring device is one of the important structural Three wheel bikes , the quality of its structural rigidity and dynamic performance of the merits of the crankshaft grinder precision machining very large impact . Therefore, in the design phase of the crankshaft grinder measuring devices need to be applied finite element analysis method for quantitative analysis of its stiffness and vibration characteristics, in order to understand the deformation measuring device at work , to understand their natural frequencies and mode shapes corresponding characteristics to identify their weaknesses . Here in Shanghai Machine Tool Works Co., Ltd. developed a large CNC crankshaft grinder cut Cargo bike tracking (hereinafter referred to as " crank grinder " ) measuring device for the study were analyzed . Establish a simplified geometric model wheel frame measuring device measuring device finite element model is composed of many parts assembled complex structures , mainly by the base of the stand , measuring head frame of the knife device , towline and installation of the measuring head and the knife holder composed of many components on the device , and there is no contact between the connecting multiple parts . If the model is simplified, will largely affect the calculation speed , and may even cause serious error calculation does not converge . Therefore, before meshing , the first of the CAD model to simplify the measuring device , such as the removal does not directly bear the force of the towline , the impact of small bolt holes and rounded and chamfered so the parts are ignored

Folding Electric Tricycle Bike Design

With the development of society, electric trike problems and pollution problems have become increasingly serious. Such congestion and impede the face of today's environmental and health traffic conditions , the need for a lightweight, portable transport to serve the people's daily life , which brought great development space for folding bicycles . Benefits folding bike is that it can be taken on the subway , buses and other public transport , destination distance when it needs to turn the car can be used for short-distance transport, etc. This will not only save the time and save the car interchange fee, you can achieve the purpose of maintenance and bicycle theft . Current development in a wide variety of bicycles modern means of transport , the Three wheel bikes has been one of people's daily lives and the most closely related products . Cycling has been 200 years since the birth of history . From a play, entertainment appliances started via transport vehicles to today's leisure, entertainment, fitness partner, the invention of the bicycle and Evolution According to historical records , the earliest kind bike is 1791 French Siv Mubarak invention toy horse tops two wheels "toy horse ." Because no drive , cushion low rider feet on the ground , with the pedal forward Chuan .

Giant bicycle

Bicycle chrome molybdenum steel frame: 90 s, bicycle frame with chrome molybdenum steel system for the mainstream. Its distortion performance and good tensile properties, high temperature will not affect the material, when welding the price is cheap. But the weight is heavy, easy to oxidation. Trend in recent years to overcome its points less, play to the advantages of the new material, chrome molybdenum steel frame are once again. Carbon fiber frame: light and absorb the impact of the ground, quick Three wheel bikes of backwash force, etc., is the ideal bike frame material. Carbon fiber grade, tonnage high elasticity are also higher and higher, the price is expensive. There are several kinds of methods, such as with adhesive on the mould, overlapping carbon fiber, heat treatment, solidification, molding, etc. The proportion of titanium frame, titanium is 55% lighter than steel, it is not easy to oxidation. In order to improve the tensile strength, hasCargo bike aluminum, vanadium and titanium alloy. Such as welding needs to be done in a vacuum processing complex, frame price expensive.Aluminum frame, aluminum alloy frame of light and strong rigidity. After special processing a frame of only 1 kg in weight. Aluminum pipe tends to large diameter, to alleviate the too strong rigidity, the current car seat tube and fork used absorb the impact force is strong carbon fiber and other popular attention.

The invention of the bicycle about bike more

The invention of the bicycle about bike more
(1) China is invented the bicycle the earliest country in the world. Bicycle is China five hundred years BC, the father of the unicycle. The qing emperor kangxi years (1662 ~ 1722), Huang Lvzhuang had Folding electric bikes the bicycle. Eleven years "unofficial history qing dynasty grand view", "the two-wheeled vehicles made by Huang Lvzhuang a, more than thirty feet, one can sit, and need not to push pull, can on their own. Row, with the hand crank arm shaft, is the same, the directorate increases with the increasing living wan foot line eight miles." This is the world's first bicycle.
(2) the bicycle was invented by western europeans. In 1790, the French west, developed into a wooden bike, no handlebar, pedal, chain. Three wheel bikes like a Trojan horse car is at the feet of nail with two wheels, two wheels fixed in a line. Due to the bike without drive and steering, seat cushion is low, the schiff, oneself ride in the car, two feet on the floor, push to the backward, make the car along a straight line. In 1817, Germany von? Baron DE les has developed a free activity of handlebar, converting his bike is more convenient. In 1818, DE les applied for a patent in the UK. In 1839, a British workers K? Macmillan pioneered the rear wheel is driven by crank mechanism to bicycle, can make the person feet off the ground when riding a bicycle. One day in 1861, the Paris of the carriage and the stroller manufacturer michaud bicycle repair DE les type, father and son on the ramp test after repair, feel the car foot rest is difficult, then has carried on the improvement to it and install on the car front wheel pedal crank shaft, thus invented michaud bike, the bike soon began to mass production. Probably around 1870, the French horse of the front drive wheels and created a large, driven wheel behind a small bike, the car running effect is good. 1890 years later, the humber of British company to produce a kind of the use of chain transmission, car bike for diamond, this kind of bicycle has been in use today.
(3) bicycle invented for the russians. One day in September 1801, the Russian serfs alta mo make wooden bike riding himself, 2500 km, arrived in Moscow to the tsar Alexander I of a tribute. Alta mo's manufacturing the schiff, making the bicycle and the French car is relatively similar. Alexander I see alta mo's manufacturing bicycle, immediately ordered the cancelled his status as a slave.

Folding bicycle design discussed in this paper

Today's society, because the Cargo bike such as pollution, traffic congestion, on the design of the urban transport convenience and environmental protection become a big trend, city appeared a lot of folding bicycles. Folding bicycles form is clever and green environmental protection, can save a space and meet the needs of people fast rhythm life, ideal short-distance transportation for the future. Analysis of folding bicycles, folding way, set out from human and beautiful, design more convenient folding bicycles. The emergence and development of folding bicycles, bicycle as short-distance transport have irreplaceable by other means of transport, "but now the Folding electric bikes traffic congestion, bicycle park area is obviously insufficient, lack of bicycle parking places, parking situation serious and sidewalks bicycle stolen phenomenon is very serious. And simple structure, smart and quick, easy to carry, but folding bike is a good way to solve these problems." Folding bike is originated in Europe in the 1930 s for military purposes and with the popularity of cars and increasing urban population and, in recent years due to the various new material, new technology and structure of innovation so that a smaller, lighter and more sturdy and durable. Bicycle is the development direction of personalized design, functional integration, light weight and manipulation of the dictionaries, style diversity, bicycle series

Super sport motorbike

Sports motorcycle and car. Its design idea is for people to leisure, is a kind of interesting traffic tools, is also experience life fun amusement tools. Sports including motorcycle very extensive, the following super sport motorcycles and motorcycle trip, has the Folding electric bikes of sports motorcycle, so can also be classified as sports motorcycle. Mainly used in road motorcycle shop road motorcycle road motorcycle. Road motorcycle can be divided into three categories, motorcycle that is super sports motorcycle, motorcycle and American motorcycle trip. Because of this motorcycle, mainly on the flat topdress again so called urban motorcycle. Road motorcycle Three wheel bikes and scope of application is also very vague, actually called ordinary motorcycle would be better. In structure, road motorcycle is only applicable to paving the road, the motorcycle on the pavement road surface can reach the best performance, on the contrary, in no way zone there will be many difficulties while moving. Is cross-country motorcycle and at the same time, according to the use of classification, also can be divided into travel cross-country motorcycle and off-road motorcycles downtown.

Bicycle in the design of the man-machine factor analysis and research

Bicycle in the design of the man-machine factor analysis and research
Bicycle while in science and technology highly developed today, there are many means of transport than bicycle more comfortable, fast and convenient, but a people-oriented of transportation like bicycle are more and more be favorred, and become an important part of urban traffic. Thinking from a different Angle, which requires the design of the bike, to be on the basis of ergonomics, can not only emphasis on the function of the bicycle, and Three wheel bikes of use and entertainment at an organic whole, meet consumer needs at all levels, that bring the vibrant life personality. As a result, the man-machine analysis was carried out on the bike has the vital significance. In this paper, from the perspective of ergonomics, the development of bicycle design the human element and bicycles, bicycle design, design the man-machine relationship Cargo bike and research. Bicycle design is discussed, and the development, from the perspective of historical evolution, combining with the characteristics of bicycle the modelling of various periods, such as structure, material, color, design elements analyses the development characteristics of bicycle appearance modelling design, predict the future trend of the development of bicycle design: bicycle will be toward miniaturization, lightweight, rich personalization and humanity, science and technology, variety and development direction, such as antique. So as to satisfy a particular population, but also embodies the pursuit of a kind of the idea of humanization and individualized.

Folding bike design research

Powder with the development of the society, the traffic problems and pollution problem is increasingly serious. In the face of today's such a crowded and incompatible with the traffic, electric trike protection and health need a light and easy to mask with means of transportation to serve the People's Daily life, it brings to the folding bicycles huge development space. Fold. The benefits of cycling is that it can take the subway, bus, such as public transport, when distance destination need change it can be used as a short-distance transport, such already save the waiting time and save the cost of Folding electric bikes, also can achieve the goal of bicycle maintenance and security. Bicycle development present situation in varieties to many modern traffic tools, bicycle has been one of the most closely relationship with People's Daily life products. Bicycle since birth has 2 (X) of years of history. Starting as a play, entertainment equipment, through the transport, transport to today's leisure, entertainment, fitness partner, even become artistic embodiment of people's life. The invention of the bicycle and evolution according to historical records, the earliest physical bicycle is 1 in 791, the French invented the schiff, Trojan with two wheels in toys. Toy horse. ' Because there was no driver installed, and low cushions, John car are two feet on the floor, use pedal to move forward.

Mountain bike muscle endurance athletes torso flexion and extension characteristics research

Mountain bike muscle endurance athletes torso flexion and extension characteristics research
Mountain bike project is a concentration of power, speed, endurance, technology, the rhythm, which Cargo bike all the way, the people, the combination of car complicated mechanical movement project, require strong endurance. Although lower limb muscle is the main power source of cycling, but the core muscles shoulders on the responsibility of stable trunk, so that the arms and legs can complete brain conduction on the basis of the stability of instructions. Almost motionless while the upper part of the ride, but only to Three wheel bikes a stable core muscle group, to let the foot pedal power efficient role to the pedal as soon as possible. Mountain bike riding core muscle group in the process of main effect is to keep the body posture, maintain body balance, stability, upper limbs, fixed spine and pelvis, for lower limb muscle group [action power to provide a stable foundation. In a long ride, core muscle group basic with isometric contraction of static sex work is given priority to, energy consumption, easy fatigue, especially the small muscles. Numerous literature reports, the characteristics of mountain bike muscle endurance athletes torso flexion and extension number is not much, the purpose of this study is to investigate the mountain bike athletes endurance characteristics in the process of constant speed endurance test, rich mountain bike theoretical research of the project, at the same time provide a reference for bike project of core strength training.

Communication is one of the important equipment forces communication car

Overview of communication is one of the important equipment forces communications, mobility, Folding electric bikes communication, its mainly by chemical in the process of mobile power supply. The power supply using alkaline nickel cadmium battery, alkaline nickel cadmium battery in the factory, we usually don't take the electrolyte factory, to use the unit, must make or purchase and perfusion of alkaline electrolyte, soaking, activation, can be put into use after charging, the preparation is very Three wheel bikes and tedious, and each unit technology difference is bigger also, strong technical force units after the training can be competent for the job, technical force is weak unit is difficult to finish the work. After a serious argument and test that valve control type lead acid battery structure reasonable assembly close together, good impact resistance vibration performance, small size, in the case of the correct use of acidic gas overflow, the price is low, can satisfy the requirement of the on-board equipment work well, suitable for car power. Will the original alkaline nickel cadmium battery valve control type lead acid battery instead. But any chemical power source is not perfect, has its specific use environment, has its advantages and disadvantages, valve control type lead acid battery is not exceptional also, after a period of use has also exposed some problems.