JPS5839989Y2 - Motorcycle drive sprocket mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drive sprocket mounting device for a motorcycle.

In this type of device, the drive sprocket is generally fixed via bolts to a fixing plate that fits onto the output shaft and is provided integrally with the output shaft. There was a risk that the drive sprocket could be removed and modified to a larger diameter one.

The present invention aims to provide a mounting device that makes it difficult to modify the drive sprocket, and includes a drive sprocket 5 that fits on the output shaft 4, and a fixing plate 7 that is integrally provided on the output shaft 4. , a drive sprocket mounting device for a motorcycle that is integrally connected via a bolt, a first screw rod 1 that screws the bolt into a drive sprocket 5 and a fixing plate 7; A large circular flange 2 is formed on the top, and a second screw rod 3 protruding from the flange 2 has the same screw direction as the first screw rod 1, and the second screw rod 3 has a smaller diameter than the circular flange 2. At the same time, the length is short enough to apply two nuts.

The second screw punch 3 can be used to apply one nut, but it cannot be made into a so-called double nut type, which is capable of applying two nuts, and has a relatively short length, such as a screw. 5 pitches or less is preferable.

In the figure, 6 indicates tribene. To explain its operation, the bolt of this invention is screwed onto the label at its bright part 1 and tightened, and when rotating for warping, a nut is first attached to the second screw punch 3 and then the nut is passed through the bolt. The bolt can be rotated by hand or by using a nut-like tool, and then the nut can be removed, leaving the bolt unremovable.

That is, in order to remove it, for example, put a nut on it,
If you turn this in the opposite direction, the nut will simply come off, leaving the bolt in place, making it impossible to remove it.
For example, the user cannot modify the drive sprocket 5 by replacing it with a larger diameter one.

In this case, if the nut is a double nut, rotation in the opposite direction is possible, but the second screw 3 is insufficient in length and is therefore not compatible with this method, and its diameter does not match the flange. 2, the contact surface between the nut screwed onto the screw punch 3 and the flange 2 is smaller than the contact surface between the flange 2 and the fixing plate 7, so the first Only the nut can be removed without loosening the screw 3.

In this way, when using the present invention, drive sprocket 5
The bolt that integrally connects the drive sprocket 5 and the fixing plate 7
a first screw rod 1 that is screwed together with the first screw rod 1; a large-diameter circular flange 2 formed on the top of the first screw rod 1; and a second screw rod that projects on the flange 2 and has the same thread direction as the first screw rod 1. 3, and the diameter of the second screw rod 3 is smaller than that of the circular flange 2, and the length is short enough to attach two nuts. Therefore, one nut can be attached to the second screw rod 3. Therefore, the bolt can easily screw together the drive sprocket 5 and the fixing plate 7, and the nut attached to the second screw rod 3 can be easily removed without loosening the first screw rod 1. Since the bolts that screw together the sprocket 5 and the fixing plate 7 cannot be easily removed, this has the effect of preventing modification of the sprocket.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the bolt, and FIG. 2 is a vertical sectional view showing an embodiment of the present invention. 1...Razu, 2...7 lunges, 3...
...Second screw punch, 4...Output shaft, 5...
...Drive sprocket, 7...Fixing plate.

Claims (1)

[Scope of utility model registration request] A drive sprocket mounting device for a motorcycle that integrally connects a drive sprocket 5 that fits onto an output shaft 4 and a fixing plate 7 that is integrally provided on the output shaft 4 via bolts. , a first screw rod 1 for screwing the bolt into the drive sprocket 5 and the fixing plate T, a large diameter circular flange 2 formed at the top of the first screw rod 1, and a screw protruding onto the flange 2. forming a second screw rod 3 having the same direction as the first screw rod 1;
A drive sprocket mounting device for a motorcycle, characterized in that the second screw rod 3 is made smaller in diameter than the circular flange 2 and short enough in length to attach two nuts.