JPH0371318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motorcycle in which an engine is rubber-mounted to a vehicle body using anti-vibration rubber.

Generally, in motorcycles, the engine is rubber-mounted to the vehicle body via anti-vibration rubber in order to reduce the transmission of engine vibrations to the vehicle body. However, in chain-driven motorcycles, the chain is strongly stretched, especially when sudden acceleration or sudden engine braking is applied, so the tension of the chain acts on the engine. In this case, if the engine is rubber mounted as described above,
Since the engine is strongly pulled by the tension of the chain, torsional displacement may occur, and as a result, the distance between the front and rear sprockets may decrease, causing a large amount of slack in the chain.

The present invention was made based on the above circumstances, and even when the engine is subjected to chain tension, it is possible to prevent large displacement of the engine without reducing the vibration isolation performance of the engine relative to the vehicle body. Furthermore, the present invention aims to provide a rubber mount structure for an engine in a motorcycle that eliminates the need for a special structure for fixing the rod, reduces the number of parts, and ensures sufficient mounting strength for the rod.

That is, in order to achieve the above object, the present invention
In a motorcycle in which the engine is rubber-mounted to the vehicle body via anti-vibration rubber, and the power of the engine is transmitted to the rear wheels through a chain, an abbreviation of the direction in which the chain runs between the engine and the vehicle body. The present invention is characterized in that a rod is installed along the longitudinal direction of the vehicle body, and the connecting portion of this rod on the engine side is fastened together with a bolt that connects the engine to the vehicle body.

According to this configuration, even if a large tension is generated in the chain due to sudden deceleration or acceleration and this tension is transmitted to the engine, the rod receives this tension as a compressive force and counteracts it, so that the tension exceeds the allowable limit of the engine. Displacement can be prevented. Therefore, there is no large slack in the chain,
It is possible to prevent the occurrence of knocking noise and wear. At the same time, it is possible to use a vibration-proofing rubber that is soft and has excellent vibration-absorbing performance, and the vibration-damping performance of the engine can also be maintained well.

Furthermore, since the rods mentioned above are connected to the engine using the bolts used to connect the engine to the vehicle body, there is no need for special bolts to fasten the rods to the engine, and the rods are dedicated to the engine side. There is no need to provide a receiving part for the bolt, and the number of parts can be reduced and the structure can be simplified accordingly. Furthermore, since this bolt is for an engine mount, it has high rigidity and strength, and can sufficiently resist the force applied to the connection between the rod and the engine through the chain.

An embodiment of the present invention will be described below based on the drawings.

In the figure, reference numeral 1 denotes the vehicle body, in which tube members 4, 4 and down tubes 5, 5 made of extruded aluminum alloy and having a square cross section are connected between a steering head pipe 2 at the front end and brackets 3, 3 at the rear. It is configured as follows. Steering head pipe 2
includes a front fork 7 having a front wheel 6 at its lower end;
is pivotably supported so as to be freely steerable, and a clip-on handle 8, for example, is connected to the upper end of the front fork 7. The rear wheels 9 are attached to the brackets 3 and 3.
A rear arm 10 having a rear arm 10 is supported by a pivot shaft 11 so as to be swingable in the vertical direction. Note that a buffer (not shown) is bridged between the rear arm 10 and the vehicle body 1. Reference numeral 12 denotes an engine cooling radiator attached to the down tubes 5, 5, and as shown in FIG.
A heat dissipation core 14 is connected between 13b. An auxiliary tank 15 extending inwardly along the heat dissipation core 14 is provided at the upper end of one cooling water tank 13a.
A cap 16 is attached to the inner end of this auxiliary tank 15. In such a radiator 12, the cap 16 is connected to the cooling water tank 1.
Since it is placed inside the upper end of 3a, the handle 8
If the handle is a clip-on handle, even if the handle is rotated in one direction to the position shown by the imaginary line 8', the handle 8' will not hit the cap 16. Therefore, the height and width of the radiator 12 in the left and right direction can be ensured sufficiently, and the heat dissipation performance is high.

The radiator 12 is a water-cooled V-type engine 18
water-cooled. The water-cooled V-type engine 18 is rubber-mounted on the vehicle body 1 by means described later. Exhaust pipes 21, 21 are led out and extended rearward. A cabinet 22 integrally formed with the crank chamber of the engine 18 is located at the rear of the crank chamber, and a drive sprocket 23 is provided within the gear box 22 so as to be offset to one side. This drive sprocket 23 drives a driven sprocket 25 of the rear wheel 9 via a chain 24. Note that 26 is a fuel tank installed on the upper part of the vehicle body 1, 27 is a seat, and 28 and 28 are footrests.

The engine 18 is rubber mounted on the vehicle body 1 with the following structure. That is, the engine 18 is suspended on the vehicle body 1 side at the locations indicated by and in FIG. Since the rubber mount structures in the two parts are substantially the same, the part shown in FIG. There are brackets 3, 3 on the outer periphery of the bolt 30.
A collar 32 is inserted between the inner surfaces of the collar 32. A cylindrical anti-vibration rubber 33 is provided on the outer peripheral surface of the collar 32.
is fixed by baking, and a sleeve 34 is fixed by baking on the outer circumferential surface of the vibration isolating rubber 33.
The sleeve 34 is press-fitted into a fitting hole 36 of an engine bracket 35 protruding from the engine 18.

Also in the section, a bolt 38 similar to the bolt 30 in FIG. 4 is bridged between the tube members 4, 4, and a rubber mount structure similar to that in FIG. 4 is adopted between the pipe member 18 and the engine 18.

Therefore, the vibrations of the engine 18 are absorbed and relaxed by the vibration isolating rubber 33 at each section, and are less likely to be transmitted to the vehicle body 1 side.

The portion of FIG. 1 is detailed in FIG. 5, which is shown as a sectional view taken along the - line. That is, 40 is a bracket fixed to the tube members 4, 4, and a vibration-proof rubber case 41 is fixed to this bracket 40 by bolts 42. A sleeve 43 is press-fitted into the anti-vibration rubber case 41, and a cylindrical anti-vibration rubber 44 is baked and fixed to the inner peripheral surface of the sleeve 43. A collar 45 is baked and fixed to the inner peripheral surface of the vibration isolating rubber 44. A bolt 46 is press-fitted through the collar 45, and this bolt 46 is screwed onto the side surface of the engine 18. Therefore, even in such parts, the vibrations of the engine 18 are transmitted to the vibration isolating rubber 44 via the bolts 46, absorbed and alleviated by the vibration isolating rubber 44, and the vibrations of the engine 18 are transmitted to the vibration isolating rubber case 41, the bracket 40, and the pipe member. It is difficult for the signal to be transmitted to the 4th and 4th sides.

By the way, a rod 50 is spanned along the front-rear direction between the bolt 46 in FIG. 5 and the bracket 3 on the vehicle body 1 side. The bolt 46 passes through the insertion hole 51 formed at the front end of the rod 50, so that the front end of the rod 50 can be integrally attached to the engine 18 using the bolt 46 that connects the engine 18 and the bracket 40. is connected to.
The rear end of the rod 50 is rotatably connected to the bracket 3 via a ball joint 52.

The rod 50 is provided on an extension of the chain 24 in the spanning direction, and is preferably provided on an extension of a line connecting the center of the drive sprocket 23 and the center of the driven sprocket 25 along the front-rear direction. Placed.

Further, the configuration shown in FIG. 5 is configured symmetrically on the left and right sides of the vehicle body 1.

The operation of such a configuration will be explained. engine 1
Engine vibration is generated during operation of the engine 18, but each part of the engine 18 is suspended on the vehicle body 1 side via anti-vibration rubbers 44 and 33, so the vibrations are suppressed by these anti-vibration rubbers 44 and 33. The engine vibrations are absorbed, and therefore engine vibrations are difficult to transmit to the vehicle body 1.

On the other hand, when sudden acceleration or sudden engine braking is applied, the chain 24 is strongly extended, so the tension of the chain 24 is applied to the engine 1.
Each anti-vibration rubber 44, 3 has a rubber mount on it.
3 is elastically deformed, and the engine 18 is connected to the chain 24.
The material tends to be twisted approximately horizontally along the direction in which it is stretched. However, rods 50, 50 are arranged on both sides of the engine 18 along the longitudinal direction, and the front ends of these rods 50, 50 are fixed to the engine 18, and the rear ends are connected to the brackets 3, 3. Therefore, the thrust resistance of these rods 50, 50 prevents the engine 18 from being torsionally displaced in the horizontal direction.

As a result, the distance between the drive sprocket 23 and the driven sprocket 25 is not changed, so the chain 24 does not loosen significantly.
Chain knocking noise and sprocket 2 due to slack in 4
3 and 25 can be prevented.

In addition, the rods 50 and 50 are attached to the front and rear sprocket 2.
If it is provided on the extension of the line connecting the centers of 3 and 25, it will almost match the direction in which the tension is applied to the chain 24, and there will be no deviation in the vertical direction between the rods 50, 50 and the direction in which the tension is applied. The engine 18 will not tilt when the chain 24 is tensed.

Furthermore, if such rods 50, 50 are used, the longitudinal vibrations generated in the engine 18 will be transmitted to the brackets 3, 3 through these rods 50, 50, but in the engine 18, vibrations generated in the longitudinal direction will be transmitted to the side of the brackets 3, 3. In addition to the small vibration to
The longitudinal vibrations do not bother the occupants too much. The vertical vibrations occurring in the engine 18 are caused by the fact that the rear ends of the rods 50, 50 are connected to the bracket 3 via a ball joint 52, and the rod 50 swings around the ball joint 52. 52 to the vehicle body 1 side. Moreover, the front end of the rod 50, which opposes the tension of the chain 24, is fixed to the engine 18 side using the bolt 46 that connects the engine 18 and the bracket 40.
There is no need for special bolts for fixing the 0 to the engine 18. At the same time, since there is no need to provide a dedicated bolt receiving part on the engine 18 side, the number of parts can be reduced and the structure can be simplified, which has the advantage of contributing to cost reduction.

Further, since the bolts 46 are for connecting the engine 18 to the down tubes 5, 5 of the vehicle body 1, they are inherently high in rigidity and strength, and a chain is used at the connection between the engine 18 and the rod 50. Even if a large force is applied from the 24 side, this force can be sufficiently resisted. Therefore, sufficient mounting strength of the rod 50 can be ensured, and displacement of the engine 18 can be reliably prevented.

In the above embodiment, the rods 50, 50 are arranged on both the left and right sides of the engine 18, respectively. According to this, when tension is generated in the chain 24 and the engine 18 is torsionally displaced in a horizontal plane, the chain 24
A compressive force acts on the rod closer to the rod, and a tensile force acts on the rod farther from the rod, and torsional displacement of the engine 18 is prevented based on the rigidity of the rod against these forces.
However, the present invention is not limited to having rods on both the left and right sides at the same time, and even with at least one rod, the function of preventing torsional displacement of the engine 18 can be achieved.

According to the present invention described in detail above, even if a large tension generated in the chain due to sudden deceleration or acceleration is transmitted to the engine, the rod receives this tension as a compressive force and counteracts it, so that it exceeds the allowable limit of the engine. can prevent displacement. Therefore, there is no large slack in the chain,
It can prevent knocking noise and wear. In addition, since the anti-vibration rubber is soft and has excellent vibration-absorbing performance, it is possible to maintain good anti-vibration performance of the engine.

Furthermore, since the rod is connected to the engine using bolts that connect the engine to the vehicle body, there is no need for special bolts for fixing the rod, and there is also a special bolt receptacle on the engine side. Since there is no need to provide a separate section, the number of parts can be reduced and the structure can be simplified, making it possible to provide the device at a low cost. In addition, this engine mount bolt is inherently high in both rigidity and strength, so it can sufficiently resist the force applied to the connection between the rod and the engine through the chain, and the installation strength of this rod is also sufficient. This has the advantage of reliably preventing displacement of the engine.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the motorcycle, Fig. 2 is a bottom view, Fig. 3 is a front view of the radiator, Fig. 4 is a sectional view of the middle part of Fig. 1, and Fig. FIG. 5 is a sectional view taken along the line - in FIG. 1. 1...Vehicle body, 3...Bracket, 4...Pipe member, 5...Down tube, 18...Engine,
33, 44... Anti-vibration rubber, 46... Bolt, 50
... Rod, 52 ... Ball joint.

Claims (1)

[Scope of Claims] 1. A motorcycle in which an engine is rubber-mounted to a vehicle body via a vibration-proof rubber, and power from the engine is transmitted to the rear wheels via a chain, wherein the above-mentioned A rod is installed along the longitudinal direction of the vehicle body, located approximately on the extension line of the chain, and the connecting portion on the engine side of this rod is tightened together with the bolt that connects the engine to the vehicle body. A rubber mount structure for engines in motorcycles.