JPS6010958Y2 - Motorcycle chain guide device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a guide device for a rear wheel drive chain of a motorcycle, especially an off-road vehicle, which allows the chain to engage smoothly with the sprocket even when driving on rough terrain, and which also provides a sturdy chain. The purpose is to obtain a guide device.

In order to distantly relate to that purpose, it has been structured as follows.

That is, a pair of guide plates 7ay7b facing each side of the rear wheel drive chain 3 of the motorcycle are attached to the rear fork 1 with bolts 6 passing through the guide plates 7a, 7b and the upper spacer 9 between them.

6a is a nut fixed to the rear fork 1, and 5 is a bracket interposed between the guide plate 7a and the rear fork 1.

Then, the lower surface 9a of the upper spacer 9 is brought close to the upper surface of the link plate 3a of the chain 3, and the bolt 13a is passed through the spacer 9 from the lateral direction immediately above the lower surface 9a of the upper spacer 9, that is, at a position close to the chain 3. Te Natsu 13
Tighten and fix both guide plates 7a and 7b together with b.

Also the above guide board? a,? A cylindrical spacer 12a, 12b divided in half in the axial direction is interposed in the lower part between b, and a chain 3 is inserted into the narrow diameter stepped portion formed in the cylindrical spacer 12a, 12b.
A tubular guide roller 8 that receives the lower surface of the link plate 3a is fitted therein, and a bolt 10 is passed through the inner hole of each cylindrical spacer 12a, 12b, and the two guide plates 7a, 7b are jointly tightened together with a nut 11.

The tubular guide roller 8 and spacer 9 may be made of synthetic resin or aluminum alloy.

As mentioned above, the present invention is based on the link plate 3 of the chain 3.
Since the lower surface of the chain 3 is supported by the tubular guide roller 8 and the lower surface 9a of the upper spacer 9 is brought close to the upper surface of the link plate 3a, vertical vibration of the chain 3 is almost suppressed.

Also, just above the bottom surface of the upper spacer 9 and the cylindrical spacer 1
2a, 12b are passed through horizontal bolts 13a, 10, and are jointly tightened with both guide plates 7a, 7b with nuts 13b, 11, so that both guide plates 7a, 7b can be fastened to the bolts and nuts near the chain 3. 13a, 13b,
10. Since it is reinforced by 11, when driving on uneven ground, the chain 3 shakes violently as shown in Fig. 3, and both guide plates are damaged. A highly durable chain guide device can be obtained without deforming the guide plate or loosening the assembly bolts/nuts IO, IT, etc. even if they hit points a and 7b.

Further, a cylindrical spacer 12 at the bottom of both guide plates 7a and 7b
Divide a and 12b into two in the axial direction, and insert both spacers 12.
Since the tubular guide roller 8 is fitted into the narrow diameter stepped portions of a and 12b, the assembly of the guide roller 8 is simple in structure.

In addition, since the link plate 3a of the chain 3 is supported by the guide roller 8, the chain does not oscillate laterally or move up and down, as in the case where the guide roller 8 receives the lower surface of the chain-side roller fitted to the link plate connecting pin. This prevents the lower surface of the link plate 3a from riding on the guide roller and damaging the plate or causing noise.

[Brief explanation of the drawing]

FIG. 1 is a front view of the chain guide device of the present invention, FIG. 2 is a longitudinal cross-sectional view thereof, and FIG. 3 is a cross-sectional view of the chain in a horizontally swaying state. 1 is the rear fork, 2 is the rear sprocket, 3 is the chain, 3a is the link plate, 6.10° 13a is the bolt, 6a, 11, 13b are nuts, ? a and 7b are guide plates, 8 is a tubular guide roller, 9 is an upper spacer, 9a is its lower surface, and 12a and 12b are cylindrical spacers.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of guide plates facing each side of the rear wheel drive chain of a motorcycle are attached to the rear fork with bolts that pass through both guide plates and the upper spacer between them, and the upper part thereof Place the lower surface of the spacer close to the upper surface of the link plate of the chain, pass a bolt through the upper spacer from the side just above the lower surface of the upper spacer, tighten it together with both guide plates with nuts, and fix the spacer between the above two guide plates. A cylindrical spacer divided into two in the axial direction is interposed at the bottom, and a tubular guide roller that receives the lower surface of the link plate of the chain is fitted into the narrow diameter step formed in the cylindrical spacer, and the inside of each cylindrical spacer is A chain guide device for motorcycles that is connected to both guide plates by passing bolts through holes and tightening them together with nuts.