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electric bicycle

An electric bicycle, driving force technology, applied to vehicle components, rider driving, transportation and packaging, etc., can solve the problems of increasing crankshaft 71, damage or deformation, etc., to improve reliability, prevent damage or deformation, The effect of good rigidity

Active Publication Date: 2017-06-30
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the diameter of the crankshaft 71, particularly the portion 71a inserted into the bearing 75 of the crankshaft 71 or the portion 71b inserted into the side of the torque detecting cylinder 72 at the time of assembly cannot be increased too much.
[0022] Therefore, for example, if the positioning of the bearing 75 in the axial direction is not reliably performed, when a large downward force is applied from the crank arm 79 attached to the small-diameter side of the crankshaft 71, etc., the bearing 75 will lose its position relative to the crankshaft. The shaft 71 moves (slides) in the axial direction, and the part (supported part) 71a supported by the bearing 75 in the crank shaft 71 to which a large bending moment acts may be damaged or deformed.
In addition, the part (supported part) 71a supported by the bearing 75 in the crankshaft 71 and the part 71b between the engaging part 73 formed with the sawtooth part is in the shape of a round bar with a diameter equal to or less than the diameter of the narrow part of the sawtooth part. , the portion 71b may be damaged or deformed when a large downward force is applied from the crank arm 79, etc.

Method used

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Embodiment Construction

[0047] Next, an electric bicycle according to an embodiment of the present invention will be described based on the drawings. In addition, in the following description, the left-right direction means the direction in the state which faced the advancing direction.

[0048] figure 1 , figure 2 Among them, 1 is an electric bicycle. The electric bicycle 1 is equipped with a head tube 2a, a front fork 2b, a down tube (also called a down tube 2c) 2c, a seat tube (also called a seat tube) 2d, a chain rack 2e, a seat frame 2f, a bracket (also called bottom bracket) 2g, etc., a metal frame (also referred to as a frame) 2, a front wheel 3 rotatably attached to the lower end of the front fork 2b, and a rear wheel 4 rotatably attached to the rear end of the chain stay 2e , the handle 5 for changing the direction of the front wheel 3, the seat 6, the crank 7 composed of the crank shaft 17 and a pair of crank arms 18, the pedal 8 rotatably installed at the end of the crank arms 18, and...

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PUM

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Abstract

The present invention provides an electric bicycle capable of satisfactorily detecting the human driving force as the rotational force based on the pedaling force, and preventing damage or deformation of the crankshaft. The engagement parts (17Aba, 24a) of the crankshaft (17) and the torque detection cylinder (34) are arranged on the first bearing (29A) on the crank gear side and the counter crank gear side which rotatably support the crankshaft (17). In the intermediate portion between the second bearings (29B), a cylindrical body ( 40). Then, the cylindrical body (40) is brought into contact with the second bearing (29B), and the cylindrical body (40) restricts the movement of the second bearing (29B) to the engaging portion (17Aba, 24a) side in the axial direction. .

Description

technical field [0001] The present invention relates to an electric bicycle capable of running by adding an auxiliary driving force generated by an electric motor to a human driving force derived from pedaling force. Background technique [0002] Known electric bicycles are known, that is, there is an accumulator such as a storage battery and a motor powered by the accumulator, and by adding the auxiliary driving force (assisting force) of the electric motor to the pedaling force (human driving force) from the pedals, even the It is also possible to travel uphill and the like with ease. In this electric bicycle, a force corresponding to a pedaling force applied to the pedals is detected by a torque sensor, and an auxiliary driving force corresponding to the pedaling force is generated by an electric motor. [0003] In this case, as a method of using a torque sensor to detect the force corresponding to the pedaling force (human driving force), there is a method of disposing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M6/50B62M6/60
CPCB62M6/50B62M6/60B62J45/411B62J45/421B62M6/65B62M3/003
Inventor 川上将史山本达明
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD