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Chain tension applying device

An add-on, tensioning technology used in chain/belt drives, transport and packaging, vehicle gearboxes, etc.

Inactive Publication Date: 2010-05-12
SHIMANO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, once the conventional chain tensioning device is installed on the vehicle frame around the front sprocket or the rear sprocket, it may not be able to respond to changes in the axial distance between the vehicle frame and the sprocket.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0030] exist figure 1 Among them, the bicycle 10 adopting one embodiment of the present invention has a frame body 20, a suspension fork 22, a vehicle frame 12 with a rear swing arm 24, a handlebar 14 fixed on the suspension fork 22, and a chain 26 mounted thereon. , pedal PD and a gear crankshaft 28 of a front sprocket 28a and a drive unit 16 composed of a built-in transmission hub 30, etc., a front wheel 18 and a rear wheel 19 mounted on a suspension fork 22 and a rear swing arm 24. Suspension fork 22 is mounted on frame body 20 freely rotatably about a tilted longitudinal axis. The rear swing arm 24 has a rear suspension 32 and is freely swingably mounted on the rear of the frame body 20 . Such as image 3 As shown, a barb-shaped rear hook portion 24a for mounting the rear wheel 19 is formed on the rear end portion of the rear swing arm 24, and a mounting flange portion 24b extending downward is formed below the rear hook portion 24a. Such as Figure 5 As shown, while b...

no. 2 approach

[0048] In the above-mentioned first embodiment, the tension member 58 is constituted by the base member 66 and the moving member 68, but in the second embodiment, the tension member is constituted by only the moving member.

[0049] exist Figure 6 and Figure 7 In the same manner as the first embodiment, the chain tensioner 140 is mounted on the mounting flange portion 24b to apply tension to the chain 26 so that the chain 26 does not fall off from the front sprocket 28a or the rear sprocket 52 of the crankshaft 28 . The chain tensioner 140 has a bracket 156 that can be mounted on the mounting flange portion 24b, and is immovably fixed on a shaft that is substantially parallel to the axis of rotation of the rear sprocket 52 (hub shaft 42) with respect to the bracket 156. The tension member 158 in the first direction, the fixed position adjustment mechanism 160 ( Figure 7 ) and the force member 162 ( Figure 7 ).

[0050] The bracket 156 is fixed to the mounting flange po...

Embodiment approach

[0061] (a) In the above two embodiments, the brackets 56 and 156 are attached to the attachment flange portion 24b of the vehicle frame 12, but the brackets may be attached to the vehicle frame through the hub axle attachment portion. In this case, if the chamfer for stop is formed on the hub axle, it can stop and determine the installation phase of the bracket by this, and it can also stop with respect to the vehicle frame.

[0062] (b) In the above-mentioned first embodiment, the sliding shaft 70 is caulked and fixed to the bracket 56. In the second embodiment, the moving member 168 is rotatably supported by the sliding shaft 170, and vice versa. For example, in the first embodiment, the slide shaft 70 may be riveted and fixed to the base member, the clamping portion 72 may be formed on the bracket, and the fixed position in the first direction may be adjusted. Furthermore, in the second embodiment, the sliding shaft 170 may be rotatably mounted on the bracket, and the clamp...

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PUM

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Abstract

There is provided a chain tension applying device for a bicycle that can accommodate a change in an axial distance between a frame and a sprocket. A chain tensioner (40) is a device for applying tension to a chain (26), including: a bracket (56); a tension member (58); a securing position adjustment mechanism (60); and an urging member (62). The bracket is mountable to a frame (a mounting lug (24b)) of the bicycle. The tension member is secured to the bracket immovably in a first direction and movably in a second direction different from the first direction, and can apply tension to the chain.The securing position adjustment mechanism can adjust a securing position of the tension member to the bracket in the first direction by sliding. The urging member urges the tension member in the first direction.

Description

technical field [0001] The present invention relates to a tensioning device, in particular to a chain tensioning device for adding tension to a chain. Background technique [0002] Hang the chain between the front sprocket and the rear sprocket on the bike. The chain gradually elongates with use and easily falls off the sprockets. To prevent this, there are mechanisms that add tension to the chain. In a so-called light bike in Japan, a positive hook-type rear hook having an opening at the rear is formed at the rear end of the frame, and tension can be applied to the chain by moving the hub axle rearward. [0003] On the one hand, a barb-shaped rear hook opening obliquely below the front is formed on the rear end portion of a frame for a mountain bike or the like. In a chain mounted on a frame having such a barb-shaped rear hook, tension is usually applied to the chain by a rear derailleur of an external derailleur. However, recently, multi-staged built-in shift hubs have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B62M9/16
CPCB62M9/126B62M9/16
Inventor 浦部宏之
Owner SHIMANO INC
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