JPS6311031Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is an auxiliary equipment drive device for a motorcycle that drives an auxiliary equipment such as a speedometer by the rotation of the front wheel. A hub is rotatably supported via a bearing provided in a bearing hole of the hub, and an opening is provided on the wheel hub side between one leg of the front fork and one end of the wheel hub. A gear case is disposed to be supported by the axle, and a drive shaft for driving auxiliary equipment such as a speedometer is rotatably accommodated in the gear case, and the drive shaft is connected to the wheel hub by a retainer. The present invention relates to an auxiliary drive device of a type that drives the vehicle.

The auxiliary drive device of the above type is, for example,
As shown in Japanese Utility Model Publication No. 37555 and Japanese Utility Model Publication No. 44-22938, this conventional method involves connecting the inner end of the retainer and the opening edge of the bearing hole of the wheel hub in order to rotate the retainer in conjunction with the wheel hub. Since a concave-convex engagement means was specially provided between the two, or the two were integrally connected with a screw,
Not only does the number of man-hours required to process the wheel hub increase, but the structure of the left and right bearing holes and the opening edges of the hub becomes asymmetrical, which increases manufacturing costs. A sealing member is interposed between the retainer and the opening end, and the sealing performance between them is maintained for the time being, but since no sealing means is provided between the retainer and the wheel hub, there is no seal between the retainer and the wheel hub. There is a risk that rainwater and dust may enter the bearing hole.

An object of the present invention is to provide an accessory drive device for a motorcycle with a simple structure that can eliminate all of the above-mentioned inconveniences and concerns.

In order to achieve the above object, according to the present invention, in the accessory drive device for a motorcycle of the type described above, the retainer is integrally press-fitted into the opening end of the bearing hole on the gear case side via a cylindrical dust seal. The dust seal includes a cylindrical portion to be fitted together, and an engaging pawl that is integrally formed with the cylindrical portion and engages with the drive shaft, and the dust seal includes a seal lip that slides into contact with the open end of the gear case over its entire circumference. It has an integral part.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an axle 2 is horizontally fixed to the lower ends of a pair of legs 1, 1' of a front fork F of a motorcycle. A wheel hub 3 of a front wheel W is rotatably supported in the center of the axle 2 via a pair of left and right ball bearings 4 and 5, and these bearings 4 and 5 are connected to both left and right ends of a bearing cylinder portion 3a of the wheel hub 3. The bearing holes 13 are fitted into left and right bearing holes 13 that open respectively.

A speedometer drive device D provided at the front of the motorcycle is provided between one leg 1' of the front fork F and one side end of the wheel hub 3. Next, the structure of this drive device D will be described. A gear case 6 is provided on the axle 2 between one side end of the bearing cylinder portion 3a and the leg portion 1'.
This gear case 6 includes a cylindrical inner case 6a that is fitted onto the axle 2 between the inner surface of the leg 1' and the hall bearing 5, and an outer case 6b that is integrally coupled onto the inner case 6a. One side of the outer case 6b is opened to face one side end of the wheel hub 3. In the gear case 6, a hollow cylindrical drive shaft 7 is rotatably supported on the inner case 6a, and screw teeth 7a are integrally carved on the outer periphery of one end of the drive shaft 7. A screw gear 8 rotatably supported on the outer case 6b of the gear case 6 is meshed with the screw gear 8, a transmission cable 9 is connected to the screw gear 8, and the other end of the transmission cable 9 is connected to a speedometer (not shown). It is linked. Therefore, when the drive shaft 7 is rotated,
The speedometer can be rotationally driven via the screw gear 8 and the transmission cable 9.

As clearly shown in FIG. 2, a pair of engagement pieces 7b, 7 are provided on the end surface of the drive shaft 7 on the side of the bearing cylinder portion 3a.
b are integrally protruded with a phase difference of about 180 degrees, and these engaging pieces 7b, 7b can be engaged with engaging claws 10b, 10b of a retainer 10, which will be described in detail later.

As clearly shown in FIG.
is made of metal and consists of a cylindrical portion 10a and a pair of engaging claws 10b, 10b bent inside the cylindrical portion 10a in a U-shape with a phase difference of approximately 180°. The engaging claws 10b, 10b extend to a position where they can engage with the locking pieces 7b, 7b of the drive shaft 7.

A dust seal 11 made of rubber or synthetic resin is provided on the outer periphery of the cylindrical portion 10a of the retainer 10.
The cylindrical body 11a of the retainer 10 is connected to the cylindrical body 10a of the retainer 10 through the cylindrical body 11a.
is press-fitted into the open end of the bearing cylinder part 3a of the wheel hub 3, whereby the retainer 10 is coupled to the bearing cylinder part 3a of the wheel hub 3 so as to be able to rotate integrally therewith. Cylindrical body 1 of the dust seal 11
A seal lip portion 11b is integrally formed at the outer end of gear case 1a, and this seal lip portion 11b contacts the inner peripheral surface of the open end of outer case 6b over its entire circumference to seal the open end of gear case 6. Case 6
Prevent dust, water, etc. from entering inside.

In the figure, reference numeral 12 denotes another tough seal that seals between the axle 2 and the bearing hole 13 that opens at the other end of the bearing cylinder 3a.

Next, the operation of the above embodiment will be explained.

Now, as the motorcycle runs, the wheel hub 3 of the front wheel W rotates on the axle 2, and as a result, the retainer 10 rotates together with the dust seal 11, and the pair of engaging pawls 10b and 1 protruding from the retainer 10 rotate.
0b engages with the engagement pieces 7b, 7b of the drive shaft 7, and the rotation of the wheel hub 3 is transmitted to the drive shaft 7 via the engagement claws 10b, 10b and the engagement pieces 7b, 7b. The screw gear 8 is rotationally driven by the rotation of the drive shaft 7, and a speedometer can be driven via a transmission cable 9 driven by the screw gear 8.

Incidentally, in the above embodiment, a case has been described in which the speedometer is driven by the drive shaft 7, but it goes without saying that other auxiliary devices may be driven.

As described above, according to the present invention, the wheel hub of the front wheel is rotatably supported on the axle horizontally suspended at the lower part of the front fork via the bearing provided in the bearing hole of the hub, and one of the front fork A gear case that has an opening on the wheel hub side and is supported by the axle is disposed between the leg of the wheel and one end of the wheel hub. In the auxiliary drive device for a motorcycle, the drive shaft is rotatably housed, and the drive shaft is driven by a retainer that is interlocked with the wheel hub. a cylindrical portion that is integrally press-fitted to the opening end via a cylindrical dust seal;
The dust seal includes an engaging pawl formed integrally with the cylindrical portion and engaged with the drive shaft, and the dust seal integrally has a seal lip portion that slides into contact with the open end of the gear case over its entire circumference. By simply press-fitting the cylindrical portion of the retainer into the bearing hole of the wheel hub via the cylindrical dust seal, the retainer can be rotated in conjunction with the wheel hub.
For this interlocking, it is no longer necessary to specially process a concave-convex engagement means between the retainer and the edge of the bearing hole opening of the wheel hub, or to specifically fix the gap with screws, as in the past. The left and right bearing holes of the wheel hub and the opening edges thereof can be formed symmetrically, which can greatly contribute to reducing manufacturing costs. Furthermore, the dust seal can seal not only between the retainer and the opening end of the gear case, but also between the retainer and the opening end of the bearing hole, so the inside of the gear case and the inside of the bearing hole can be sealed from the outside at the same time, even though it is a single unit. This contributes to improving the durability of the gear mechanism in the gear case and the bearing in the bearing hole, and also simplifies the sealing structure thereof, improving ease of assembly. In particular, since the cylindrical dust seal press-fits the retainer cylindrical part into the bearing hole, the sealing performance of the dust seal itself can be improved by the press force. As a result, the frictional connection force between the fitting surfaces of the retainer cylindrical portion and the bearing hole can be increased.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the device of the present invention, with FIG. 1 being a longitudinal sectional view thereof and FIG. 2 being an exploded perspective view thereof. F...Front fork, 1...Leg, 2...
Axle, 3...Wheel hub, 3a...Bearing cylinder part,
4, 5...bearing, 6...gear case, 7...drive shaft, 7b...engaging piece, 10...retainer, 10a
...Cylindrical portion, 10b...Engaging claw, 11...Dust seal, 11b...Seal lip portion, 13...Bearing hole.

Claims (1)

[Scope of utility model registration request] Axle 2 mounted horizontally at the bottom of front fork F
A wheel hub 3 of a front wheel is rotatably supported via bearings 4 and 5 provided in a bearing hole 13 of the hub 3, and a space between one leg 1 of the front fork F and one side end of the wheel hub 3 is provided. The wheel hub 3
A gear case 6 having an opening on the side and supported by the axle 2 is disposed, and a drive shaft 7 for driving auxiliary equipment such as a speedometer is rotatably accommodated in the gear case 6. 7 is driven by a retainer 10 interlocked with the wheel hub 3, the retainer 10 has a cylindrical dust seal 11 at the open end of the bearing hole 13 on the gear case 6 side. The cylindrical portion 10a is integrally press-fitted through the cylindrical portion 1.
the dust seal 11;
An auxiliary drive device for a motorcycle, characterized in that it integrally has a seal lip portion 11b that slides into contact with the open end portion of the gear case 6 over its entire circumference.