JPS58128987A - Suspension system for swing unit in motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention is a swing unit for a motorcycle.

This relates to a suspension system for a vehicle.

For example, small motorcycles use swing type engines, which incorporate the engine and continuously variable transmission into a single case.
This engine unit y) K rear wheels are integrally connected, and the front end of the engine unit 1) O is swingably pivoted to the vehicle body, and the rear part of the engine unit is connected to the vehicle body Kll via a quap soap. This type of swing-type engine has a suspended structure, and when a shock is applied to the rear wheel due to an uneven road surface, the rear wheel and engine unit swing, and the shock absorber absorbs the impact. K is designed to absorb.

By the way, normally the front end of the engine and the car body are
y) At the connecting part, rubber Dan f is interposed to absorb the shock applied to this part. 2-Pada Ynoy has metal sleeves fixed to the inner and outer surfaces of an elastic team such as F5 by baking, etc., and the inner metal sleeve is connected to the pivot in a non-rotatable manner, and the outer metal sleeve is connected to the engine. It has a structure that is fixed to the side so that it cannot rotate. In this case, since the elastic parts 1 and -f are torsionally deformed by the rocking of the engine, the torque at the time of rocking is absorbed.

However, ideally, the neutral load for this type of Rubber Dan/4 is in good condition, with the main stand accommodated, the driver seated on the seat, and the weight of one passenger in a full-body driving position. The impact caused by the unevenness of the road surface is applied to such a neutral load. However, in the past, the inner metal scooter with the rubber damper was fixed to the vehicle body II (pivot) K rigid, and the outer metal sleeve was fixed to the engine I.
Since it is fixed to the IK rigidity, it will be set with a neutral load during assembly. In other words, when assembling, the main stand is erected and the load for one passenger is not added, so the load becomes neutral when the main stand is put up. Rubber Dan in the state
Torsional torque in one direction is applied to JK, causing an eccentric initial load. Such an eccentric initial load on the torsion causes variations in the damping characteristics in the forward and backward directions during the rotational reciprocating motion during shock absorption, and also causes severe fatigue in the elastic parts 1 and -f, resulting in a short life.

In order to prevent such problems, it may be possible to take into account the eccentric initial load mentioned above at the time of assembly and apply an initial load in the opposite direction so that the load is exactly neutral when the driver gets on the vehicle. There are disadvantages in that it is time-consuming to assemble and requires a particularly troublesome rounding jig that applies an initial load in the opposite direction.

The present invention was made based on the above circumstances, and its purpose is to be able to set the rubber damper at an ideal neutral load during assembly, and to accommodate the main stand and to accommodate the weight of the occupant. It is an object of the present invention to provide a suspension system for a swing unit in a motorcycle, which maintains the above-mentioned neutral load even when the suspension is moved, has a long lifespan, and has a damping characteristic that does not vary during reciprocating movement.

In other words, a link is provided between the front end of the swing unit F and the vehicle body, and a rubber damper is installed between the link and the vehicle body, and the link and the swing unit F are relative to each other. It is characterized by being pivoted so that it can be rotated freely.

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

This example shows a scooter type motorcycle, and 1 in the figure.
is the pipe frame that makes up the car body, and the down cheek
It is composed of fl and left and right main pies f3, 3. Down cheap! A steering pipe 4 is connected to the steering wheel, and a steering shaft 5 is pivotally supported on the steering head pipe 4.

A front wheel 6 is attached to the lower end of the steering shaft 5, and a handle 1 is connected to the upper end.

The engine unit is an 8-wide swing type engine unit, and an engine 9 and an automatic continuously variable transmission case 10 are integrated. The front end portion of the engine unit 8 is pivotably supported to the rising portion of the main pipe 3 by means to be described later. Further, the rear part of the engine unit 8 is suspended from the main pipe 3 by a shock absorber 11.

The shock absorber 11 is a known one, and has a lower end force x y
The rear upper surface of the continuously variable transmission case 10 in the engine unit and # is pivotally supported, and the upper end is connected to the main tie f3.
It is pivotally supported by a bracket 12 provided on the upper part of. A rear wheel IJ is integrally attached to the continuously variable transmission case 10, and this rear wheel 13 is driven by the continuously variable transmission (
(not shown). Note that 14 indicates a main stand attached to the lower surface of the engine unit I, and 16 indicates a kick arm.

Above the engine 9 is the fuel tank 16, the main pipe!
A seat 17 is provided above the fuel tank 16. Also sheet 11
A carrier I8 is attached to the rear of the vehicle.

20 is a steg I-do, 2 is a leg shield, 22 is a fender that also serves as a front cover, 123 is a front cover of the engine, 24 is a left and right side cover, 25 is a top cover, and 2# is a handle cover. 20-2
C is made of synthetic resin.

The structure for swingably connecting the ennon unit 8 to the main pipes fs and s is shown in Figure 2 and! As shown in Figure 3,
This will be explained below based on 4.

Brackets 30 and 30 are provided at the front end of the engine unit 8, spaced apart to the left and right, and brackets 32, JJ and these main/4 ears are provided at the portion where the main/4 ears 3, 3 rise. A cross member 32 has been installed at 3°3. engine unit 9af
Rakey) JO230 and main/4 ear '3.3 side! The racket, 31° 3I and the cross member 32 are interconnected by links (gray) JJ, 33.

More specifically, the rear ends of the link plates 31 and 32 are opposed to the side surfaces of the engine unit side pufket 30130, and these link plates 37. JJ and brackets so, s.

are rotatably connected by one support shaft 34.

A spacer pipe 35 is attached to the outer peripheral surface of the support shaft S4 across the link plates ss and ss. For spacer pipe 35! Three bearings are located opposite the dandruff, toso, and so! 36.36 is covered. And plaque.

Rubber Dan Δsr and zy are fitted in JOK. In the assembled one, a), the inner metal sleeve t is rotatably inserted into the above-mentioned bearing slot IJ-fllpc, and the outer precious metal sleeve f4a is fitted with a
It is rigidly fitted to the inner wall of the toso.

In addition, 41 is the 0 cylinder, 42 is the spacer, 41 is the circlip, 44 is the oil seal, and the bearing sleeve is
i and ztt are lubricated with a lubricant such as grease, and this lubricant is prevented from leaking by the 0 cylinder 41 and oil seal aaK.

With this kind of connection structure, it is linked to the engine unit S@! The rates is and as are such that they can rotate relative to each other via the support shaft 34. Rubber Dan ΔIF is used to attenuate when a large impact is applied in the direction orthogonal to the support shaft J4, and the inner metal sleeve 3# of this 2 Bar Dan / 411 is connected to the Subena / Mother Eve through the bearing sleeve fJ-. Since the rubber dampers sr and sr are rotatably attached to the engine unit 81I and the link grates ss and ss, the rubber dampers sr and sr are designed so as not to obstruct the relative rotation of the engine unit 81I and the link grates ss and ss.

On the other hand, the connection between the link plates JJ, 33, the main side parts 31, 11, and the cross member 22 is configured as follows. Link play) 33. J
Surrounding pipe 45.45 is welded to the front end of J,
These surrounding pipes 46, 45 are inserted between the bracket 31.3 and the cross member 32, respectively. And each plaque 31 e J 1 % a stanbar 32 and surrounding plates 5, 45 are connected as
, a6.

Inside the two surrounding paddles 48 and 41 are the aforementioned rubber dampers S1.
Rubber bumpers A41, 41 having a similar structure are inserted. The outer metal sleeve 49, which is baked to Rubber Dan 2410 elastic tube -7'4#, is rigidly fitted on the inner circumferential surface of the surrounding pie f41, and the elastic tube f4
Is the inner metal s')-f50 baked into 8 a connection?
It is rigidly attached to the outer peripheral surface of the root 46.

The outer circumferential surface of the connecting gel 41 is formed to have a rectangular cross section and supports the inner metal slide f50 in a non-rotatable manner. 51.
51 indicates a spacer grate. For such a connection, Link Great JJ.

33 and the main quantity ear "J" and 111 are rotated relative to each other, the outer metal sleeve f4# and the inner metal sleeve flu of each of the rubber bumpers A4r and 4r are rotated relative to each other. The elastic tube 48, which is sewn to both three parts 49 and 50, is torsionally deformed, and the torque is damped by this elastic force.

In addition, in this embodiment, the left and right link grades 33
．． Connecting rod 55 is installed at Seki 33 and I? A pair of spring holders stt, stt are welded to this connecting rod 56 spaced apart from each other in the left and right directions. The spring holders sti, si are bottomed cylindrical bodies with an opening on the front side, into which a coil spring 68.511 is fitted via an elastic holder 117.57 made of synthetic resin material or rubber. . Coil springs ss and ss are elastic holders 5
7.57VCfH, and its front end faces the rear surface of the cross member 32 described above. coil spring 5
The front end of 1.58 and the rear surface of the cross member 32 are spaced apart from each other in the normal set state, and the link grade 3
3° 33 is arranged so that it comes into contact with the main piping fs, sK when it is rotated relative to it.

The operation of the embodiment according to the above configuration will be explained.

During normal driving, impact is transmitted through the rear wheels 13 due to unevenness of the road surface. Swing around. This vibration is absorbed and alleviated by the shock absorber 11.

By the way, when a relatively large impact is applied to the engine unit 8, this impact does not simply cause the engine unit 8 to rotate around the support shaft 34, but rather causes the engine unit 8 to rotate around the support shaft 34.
Acts as a force in the direction perpendicular to 4. When a force perpendicular to the support shaft J4 is generated between the engine unit 8 and the link grades sz and as, the engine unit 81Q
9 Rubber Dan I#3 accommodated in the brackets so and so of l
Absorb by 7.37. Also, at this time, the support shaft 54K
Since the reaction force Ii is given, the reaction force is applied to the front knob pad/44'l*4r through the link plates ss and ss.
K can be conveyed.

The front rubber dan Aalt41 is the outer metal sleeve 49
and an inner metal sleeve 50 each link plate zs
, js and connection - Since the root 46゜4e@ is connected to the rizo and de, the connection of the link rates ss and ss is effective against forces in both the local direction and the direction orthogonal to the axis on the root 4*, ng. Even if the elastic tube 11 deforms and damps it.

In addition, link plates ss and ss are connected gel) 415.
46 is rotated counterclockwise as shown in Fig. 2, the coil spring 58 attached to the IK, connection port, and door 55 is 32 and absorbs the torque acting on the link plates 31 and 33 due to the bending deformation of the coil spring 58.

Therefore, in the above embodiment, three stages of damping are performed by the rear horn 1-dun depth 37.37, the front horn 1-dun A 47° 41, and the coil springs ss, ss, so that shock absorption is achieved. Because it is large, it is difficult to transmit impact to the vehicle body, which improves ride comfort. Since the above three stages of damping are performed, the elastic characteristics of each rubber damper 37/41010 elastic tube 14B can be reduced, which also improves the riding comfort.

Further, since the engine unit 8 is rotated relative to the link plates ss, ss, the set load at the time of assembly can be set as a neutral load. In other words, when mounting the engine unit 8 to the vehicle body side, the main unit J and the link plate 3j are attached to the J side in advance.

Assemble 33. In this case, the link rate is 33.3
Since the engine unit 8 is not attached to the engine 3, the link grades sx and zx are connected to the main d with no load.
Ig J and JIC can be assembled, so the front rubber bumper T447 e4rK is not subjected to any torsional load and can be set with a neutral load (zero load).

In this way, the link plate 33 is connected to the main pipe 3.3.
. Just connect them. Tsutb,
Even if the main stand 14 is erected as shown in the first illustration line and connected to the engine unit ST link clay (J j ), 33 without applying any load other than the weight of the occupant on the vehicle body, the engine unit 1 beam/fugrate can be maintained. 33.31
Since it only rotates against the ideal initial load,
In other words, the main stand 14 is stowed, and the passenger is seated)
Even if you sit on a 77, the engine sinks due to the body sinking.

The relative rotation of the shaft 8 is allowed by this support shaft 340. Even if the vehicle body sinks, no torsional load is generated on the front rubber damper 4-47#47, so the front rubber dampers 41 and 4fl can maintain the initial load as a neutral load.

For this reason, when assembling the front rubber damper 91°41
Even if it is set to a neutral load, when the main stand 14 is retracted and the weight of one passenger is applied to the initial load state, the front rubber bumper 97°47 can be maintained at an almost neutral load state, and the torsional eccentric load can be maintained. Since this does not occur, there is no variation in the damping characteristics during reciprocating rotation.

In the above embodiment, a rear rubber damper sr is installed at the pivot point between the link plate 33 and the engine unit 811.
, sr are installed to absorb the impact in the direction perpendicular to the support shaft 34, but the present invention is not necessarily limited to installing this rubber bumper/431037, but simply by using the rubber bumper/431037 through the bearing. The four desired purposes can be achieved by connecting the link plates 33, 33 and the engine unit 8 so that they can rotate freely relative to each other.

Further, the coil springs ss and 5ttK are not limited to the above.

Furthermore, in the above embodiment, a so-called engine unit, in which the swing unit has an engine and a continuously variable transmission, has been explained, but the present invention is not limited to this, and the engine is mounted on the vehicle body. , swing unit, and can also be implemented by simply having a rear swing arm type that pivots the rear wheel.

As detailed above, the present invention is a swing uni.

A link is provided between the front end of the front end and the vehicle body side, and the swing unit and the link are connected so that they can rotate freely relative to each other.
It is connected to link l' via f. Therefore, according to this article, if the vehicle body side and the link are assembled in advance via a rubber damper, and the swing unit is rotatably connected to this link, the above-mentioned rubber damper z4 #i neutral load can be reduced during assembly. In addition, when the main stand is accommodated and the load of one passenger is applied, the initial load can be applied to the rubber damper by simply rotating the swing unit and the link relative to each other. Since no initial load is applied, Rubber Dan/# maintains a neutral load state even during initial loading, so there is no variation in damping characteristics in both directions, and since no initial load is applied, Rubber Dan/f suffers less fatigue and has a long life. Become. Moreover, no special jig is required during assembly, and assembly can be easily performed.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the motorcycle, FIG. ■It is an enlarged sectional view along the line. 1...Sfia'' frame (vehicle body), 8...engine unit (swing unit, g), 11...shi,. Quapsopa, 13...rear wheel, 3 Nogawa bracket, 3
3...Link plate, 34...Spindle, set・
...Bearing, 37...Rear rubber bumper/4.47...
Front Lava Applicant Agent Patent Attorney Takehiko Suzue JP-A-58-128987 (6)

Claims (3)

[Claims] (1) A swing unit that connects the rear wheels as one unit. The front end of the K is pivotally supported relative to the vehicle body.
In a motorcycle in which the rear part of the swing unit is suspended on the vehicle body via a shake absorber, a link is interposed between the front end of the swing unit and the vehicle body, and this link and the vehicle body are connected via a rubber bumper Δ. At the same time, this swing unit for a motorcycle is characterized in that the link and the swing unit are pivoted so that they can rotate freely relative to each other! Is racking device. (2) The above link, swing unit and Onl[. A suspension system for a swing unit in a motorcycle according to claim 1, further comprising a rubber bumper interposed with another rubber bump Δ that allows these relative rotations. (3) The swing unit in the motorcycle according to claim 1 or 2, wherein the swing unit is an engine unit that integrally includes an engine and a continuously variable transmission. suspension system.