# US 4,392,542 A · Device for preventing displacement of an engine in a motorcycle

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- Number: US 4,392,542 A
- Document ID: US4392542A
- Status: Granted
- Kind: A
- Application number: 06/337,554
- Filed: 1982-01-06
- Granted: 1983-07-12
- Earliest claimed: 1981-01-09
- Assignees: Honda Giken Kogyo Kabushiki Kaisha
- Inventors: Yasuaki Aiba
- Web page: https://patentgrep.com/patent/US4392542A

## CPC

- B62K 11/04: characterised by the engine being between front and rear wheels
- B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE

## Abstract

A device for preventing displacement of an engine in a motorcycle when a driving chain which transmits the rotation of the engine to a rear wheel has created a counteraction on the engine when the motorcycle is started. The device comprises a rigid tubular member fitted about each end portion of each bolt mounting the engine on a body frame, and a generally cylindrical anti-vibratory rubber member encircling the tubular member, and secured thereto. The tubular member terminates at one end in a flange defining a pair of stops which can abut on the peripheral surface of a hole formed in the engine and through which the bolt extends.

## Claims

### Claim 1

A device for preventing displacement of an engine in a motorcycle which includes an engine, a body frame, a driving chain transmitting an output of said engine to a rear wheel, and a plurality of brackets fixed to said body frame for mounting said engine thereon by a plurality of mounting bolts, said mounting bolts being supported by said brackets and extending along a transverse direction of said motorcycle, and said engine being formed with holes to allow extension of said mounting bolts, comprising;
(a) a pair of rigid tubular members fitted about each of said mounting bolts, a member of said pair positioned adjacent to each end of said bolts, said tubular members having one end provided with a flange which defines a pair of stops abuttable on an inner peripheral surface of said holes, and
(b) a generally cylindrical anti-vibratory rubber member encircling each of said tubular members and secured thereto.

### Claim 2 (depends on 1)

The device of claim 1, wherein said rubber member comprises a generally cylindrical portion formed over each of said tubular member and disposed in said hole, and an annular flange portion disposed outwardly of said hole, said cylindrical portion having one end contacting said flange of each of said tubular member and having an outer surface contacting said inner surface of said hole, and further including a cylindrical boss projecting from the other end of said cylindrical portion into said annular flange portion.

### Claim 3 (depends on 2)

The device of claim 2, wherein said annular flange portion comprises a pair of annular plates of rigid material, and an annular mass of rubber disposed between said annular plates, one of said annular plates contacting said bracket attached to said frame and the other annular plate contacting said engine.

### Claim 4 (depends on 3)

The device of claim 3, wherein said boss is secured to said one annular plate but spaced apart from said other annular plate and said annular mass of rubber.

### Claim 5 (depends on 4)

The device of claim 4, wherein said stops extend along travel direction of said motorcycle and are spaced apart from said inner peripheral surface of said hole by a smaller distance than the vertical distance defined between said flange of said tubular members and said peripheral surface of said hole.

### Claim 6 (depends on 5)

The device of claim 5, wherein said flange is oval shape, and said stops are crescent shape.

### Claim 7 (depends on 5)

The device of claim 5, wherein said flange is generally circular, and said stops project from said flange diametrically opposite to each other and having substantially rectangular shape.

### Claim 8 (depends on 5)

The device of claim 5, wherein said flange is partially circular, and said stops are arcuately shaped.