JP3093809U - Chain extension adjustment device for motorcycles - Google Patents

Abstract

(57) [Summary] [Problem] The present invention relates to a motorcycle for rough terrain running on rough terrain or the like, and the drive chain of the vehicle vibrates due to severe throttle opening / closing operation or running on rough terrain. As a result, the chain is automatically compensated for elongation or loosening in order to prevent the chain from becoming too loose and causing an accident such as touching and damaging the car body, or coming off and breaking. An object of the present invention is to provide a highly practical motorcycle chain extension adjusting device for the purpose of preventing its wear. The present invention solves the problem that a conventional chain for a motorcycle for running on uneven terrain is guided and supported by a pulley to support the movement of the chain in order to prevent the chain from extending or relaxing due to a severe operation of a throttle. It is provided as a means.

Description

[Detailed description of the invention]       [0001]     [Technical field to which the invention belongs]   The present invention is mainly concerned with motocross motorcycles, When driving on rough terrain with a motorcycle for It is uncommon for both to hurt because the chain is loose and hits the car body due to frequent Since it was not in the state, it was devised to prevent these phenomena.       [0002]     [Prior art]   Conventional motorcycles for running on uneven terrain are different from normal motorcycles in their nature. There are various obstacles and courses with high and low levels. As a result of competing in the field, it is assumed that the chain touches the car body, The rear axle is protected by attaching a plastic protective cover, etc. The abrasion of the cover was severe, and it was not possible to bear the role.       [0003]     [Problems to be solved by the invention]   In order to prevent the above and below chains from swaying, When the chain that transmits the gin's output to the rear wheel sprocket accelerates, the ascending chain The chain extends to a straight line, and conversely, during deceleration, the descending chain As a result, the ascending chain will loosen and hit the body, causing acceleration and deceleration. It was devised to prevent this from being repeated every time.       [0004]     [Means for Solving the Problems]   In the present invention, a metal Y-shaped body base is attached parallel to the rear wheel axle, Open the arm at the end up and down, and use the end of the arm to move the ascending and descending chains. Attach a pulley that guides while holding it gently, and the pulley is always a chain If the upper and lower chains are held by a spring so as to be crimped to The pulley not only serves as an effective chain guide, but also Prevents run-out and adjusts elongation and relaxation. Even when frequent acceleration / deceleration operations are performed, the chain always transmits power to the rear wheels in an appropriate state. In addition, the vehicle body was prevented from swinging and damaging the vehicle body, and the problem was easily solved.       [0005]     [Effect of the invention]   The present invention has a simple structure as described above, does not require any special operation, and If a pulley is attached, even if it needs to be replaced due to wear with the chain, it is easy Can be replaced, so that the chain and sprockets wear out and damage the body Running on rough roads with motorcycles, motocross and tiger It is a simple and very effective device for motorcycles used in ear events.       [0006]     【Example】   The present invention will be described with reference to the accompanying drawings, in which an embodiment of the present invention is shown. Is attached to the rear axle 2 and the two arms 3 and 4 are movable in a fan shape at the top and bottom. At the tip of each arm, while slackening the chain 7 And pulleys 5 and 6 for guiding the arm, and the upper arm 3 holds the ascending chain. The lower arm 4 clamps the descending chain and pushes the upper and lower chains, respectively. The springs 8 are pulled together so that they can be pressed, so that the ascending The chain and the descending chain are loosely held inside each pulley, and Each pulley was constructed to always pressurize and extend the chain.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an image side view showing the operation of the present invention, wherein the upper part shows a stopped state, the middle part shows an acceleration state, and the lower part shows the relationship between the chain in a deceleration state and the present invention. [Description of Signs] 1 Main body of device, 2 Rear wheel axle 3 Upper arm, 4 Lower arm, 5 Upper pulley, 6 Lower pulley, 7 Chain 8 Spring,

Claims (1)

[Claim 1] A metal Y-shaped main body is attached to a rear axle of a motorcycle in parallel, a tip end is formed into an arm shape which opens up and down, and springs are attached to attract each other. Attach a pulley that also serves as a chain guide to each protruding end, fit the chain into the chain guide in each pulley, and adjust the chain in the upper and lower arm chain guides to properly adjust the extension and relaxation of the chain. A chain extension adjusting device for a motorcycle, characterized in that these drive devices are protected by always having an appropriate tension, and that the vehicle body can be prevented from being damaged due to the swing.