JPH0426319Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a vehicle body connection method for a small vehicle, such as a scooter, in which the vehicle body is divided into front and rear parts, and the front and rear divided body parts are connected so as to be able to swing relatively vertically. It is related to the device.

Prior Art In scooter-type motorcycles whose drive device is a power unit that integrates an engine and a transmission case containing a chain etc. that transmits engine power to the rear wheels, the power unit is connected via a shock absorber for the rear wheels. In addition to being connected to the vehicle body, the front part of the power unit is pivotally connected to the vehicle body, and the vehicle body and power unit are connected at multiple locations.

In such power unit type scooter type motorcycles, in order to prevent engine vibrations or vibrations caused by road surface irregularities from propagating to the vehicle body,
It has been proposed that the connection between the front part of the power unit and the vehicle body is a link connection.

As a device that meets these requirements,
There is an engine holding device for a motorcycle described in Japanese Patent No. 57-194176. This engine holding device, as shown in FIGS. 9 and 10,
It was constructed with an articulated link connection structure that has a degree of freedom of swing in two directions.

Problems to be solved by the invention However, in the one described in JP-A-57-194176, the first link 01, the second link 0
Rubber bushes 04, 05, 06 which elastically support 2 and power unit 03 respectively have inner and outer cylinders 07, 08, 09, 010, 011, 012.
The torque acting on the articulated link coupling structure is applied to the rubber bushes 04 and 0.
Since the load is borne by elastic torsional deformation of the rubber bushes 04, 05, and 06, it is difficult to bear a large load, and the rubber bushes 04, 05, and 06 become thick and have a relatively short lifespan.

Or, in the method described in Japanese Patent Application Laid-open No. 58-112888, a stopper stay is integrally provided on a link that swings with respect to the vehicle body, and stopper rubbers are attached above and below the stopper stay, and the vehicle body is always The rubber bush at the base of the link bears the load that is applied to the link base, and when a load that exceeds this load is applied, the excess torsional torque is borne by the stopper rubber. The durability of the rubber bushing is low due to the heavy load, and the power unit attached to the tip of the link is elastically supported by the rubber bushing.
There are difficulties similar to those described in Japanese Patent No. 57-194176.

Means and Effects for Solving the Problems The present invention relates to an improvement of a body coupling device for small vehicles such as motorcycles that overcomes the above-mentioned difficulties. a first compression elastic member interposed between the first link, the one vehicle body portion and the collision branch of the support bracket of the first link; and the support at the tip of the support branch of the support bracket of the first link. Directed in a direction that intersects the branch,
a second link pivotably supported around an axis parallel to the pivot axis of the first link; a shaft portion integrally protruding from the first link; a shaft portion slidably attached to the shaft portion; The first link and the second link include a receiving part that is loosely fitted and integrally protrudes from the second link, and a locking part that is detachably attached to the tip of the shaft part.
a regulating means for regulating relative rocking of the links, and a second compression interposed between the receiving part of the regulating means and the first link and between the receiving part of the regulating means and the locking part, respectively. and an elastic member, and the other vehicle body is pivotally attached to the tip of the second link so as to be swingable about an axis parallel to the pivot shaft.

Since the present invention is constructed as described above,
When the load of the other vehicle body is applied to the tip of the second link, the load component that tends to cause the second link to swing is caused by the second link interposed in the regulating means.
The second link is elastically supported by a compression elastic member, and the load component along the longitudinal direction of the second link is interposed between the one vehicle body portion and the collision branch of the support bracket of the first link. It is elastically supported by a first compression elastic member.

In this way, in the present invention, since the first and second links are used, the degree of freedom in vibration absorption can be increased, and since the first link and the second link are connected to each other using a regulating means, The degree of freedom in mounting can be increased without limiting the mounting position, and the load of the other vehicle body applied to the tip of the second link causes compressive deformation of the first compression elastic member and the second compression elastic member. Since it is elastically supported, the load is buffered stably and reliably.

In addition, in the present invention, the load can be borne only by the first and second compression elastic members without using a rubber bushing, and even if a rubber bushing is used, not only the rubber bushing but also the first and second compression elastic members are always used. Since the rubber bushings also bear the load, excessive loads are prevented from being applied to the rubber bushings, resulting in high durability and reliability.

Embodiment Hereinafter, an embodiment of the invention shown in FIGS. 1 to 6, in which the present invention is applied to a power unit type scooter type motorcycle, will be described.

The power unit type scooter type motorcycle 1 is
It consists of a front body part 2, which is usually called the body, and a rear body part 10, which is called a power unit.At the front of the front body part 2, front forks 4, which are steered by a handle 3, are mounted on the left and right sides. A front wheel 5 is rotatably supported at the lower end of the front fork 4.

Further, the rear body portion 10 is configured by integrating an engine 11 and a transmission case 12 that houses a transmission means such as a transmission means and a chain for changing the speed and transmitting the power of the engine 11 to the rear wheels 13. A rear wheel 13 is rotatably supported at the rear end of the case 12.

Further, the front vehicle body 2 and the rear vehicle body 10 can be relatively moved along a vertical plane by a vehicle body coupling device 20 in front of the rear vehicle body 10 and a shock absorber 14 at the top and rear of the rear vehicle body 10. are elastically connected.

Further, the vehicle body coupling device 20 includes a first link 2
1, the second link 30, and the elastic receiving pieces 41, 4
2, 43, and 44.

In the first link 21 of the vehicle body coupling device 20,
As shown in FIG. 2, an outer cylinder 25 is rotatably fitted into the inner cylinder 22 through bearings 23 and washers 24 made of oil-less bearings at both ends thereof, and the outer cylinder 25 has left and right ends. The left end support bracket 26 and the right support bracket 27 are fixed together by welding, and the impact prong 27a of the right support bracket 27 is oriented substantially perpendicular to the impact prong 26a of the left end support bracket 26, Supporting prongs 26 of both brackets 26, 27
b, 27b are oriented substantially parallel to each other, and the right bracket contacting branch 2 is located to the left of the center of the outer cylinder 25.
A mounting piece 28 is integrally fixed by welding on the side opposite to 7a, and a bolt 29 is attached to the mounting piece 28 in a direction opposite to the right side bracket contacting branch 27a.
are integrally protruded.

In addition, in the second link 30, as shown in FIG. 2, an outer cylinder 34 is rotatably fitted into the inner cylinder 31 via bearings 32 made of oil bearings and washers 33 at both ends thereof. Support brackets 35 and 36 are welded together in mutually parallel radial directions to the cylinder 34, and the outer cylinder 3
The support brackets 35, 3 are centered on the central axis of 4.
A receiving plate 37 is integrally fixed to the outer cylinder 34 and the support brackets 35 and 36 by welding at an angle of 70° with respect to 6, and a hole 38 into which the port 29 can be loosely fitted is provided in the receiving plate 37. A mounting cylinder 40 is integrally fixed to the support brackets 35 and 36 in a direction parallel to the outer cylinder 34.

Furthermore, elastic receiving pieces 41 and 42 are provided at each tip of the left side support bracket collision branch 26a and the right side support bracket collision branch 27a of the first link 21.
are installed in one piece.

Moreover, the mounting piece 28, bolt 29, and receiving plate 37
The cap 47 and the nut 48 constitute a regulating means.

Since the embodiment shown in FIGS. 1 to 6 is constructed as described above, after the elastic receiving piece 43 is fitted to the bolt 29 of the first link 20, the receiving plate 37 of the second link 21 is fitted. With the bolt 29 fitted into the hole 38, the inner cylinder 31 of the second link 30 is inserted into the hole of the support branches 26b, 27b of the first link 21.
A bolt 45 is inserted into the hole and the inner cylinder 31, a nut 46 is screwed onto the bolt 45 and tightened, and an elastic receiving piece is attached to the tip of the bolt 29 of the first link 21 that protrudes from the receiving plate 37. 44 and cap 47
are fitted one after another, and a nut 48 is attached to the tip of the bolt 29.
By screwing them together, the vehicle body coupling device 20 can be assembled.

With the tips of the elastic receiving pieces 41 and 42 of the vehicle body coupling device 20 assembled in this way in contact with the stepped portion 7 of the rear frame 6 of the front vehicle body 2, insert them into the holes of the bracket 8 of the frame 6. By aligning the center with the inner cylinder 22 of the first link 21, inserting the mounting bolt 9 into the hole and the inner cylinder 22, and screwing and tightening a nut (not shown) onto the bolt 9, the vehicle body coupling device 20 can be connected to the front vehicle body. Can be attached to part 2.

Furthermore, align the center of the hole in the front bracket 15 of the rear body portion 10 with the mounting tube 40 of the second link 30 of the vehicle body coupling device 20, and
The rear vehicle body 10 can be connected to the vehicle body coupling device 20 by inserting the bolt 49 into the rear body and screwing a nut (not shown) onto the tip of the bolt 49.

When the front end of the rear body part 10, which is a power unit, is connected to the rear frame 6 of the front body part 2 so as to be able to swing up and down by the body coupling device 20, for example, as shown in FIG. When the force F acts on the mounting tube 40, the following buffering action acts on the vehicle body coupling device 20.

The force F is decomposed into a component force Fr along the longitudinal direction of the support brackets 35, 36 and a radial component force Fθ in a direction perpendicular thereto.

The component force Fr in the longitudinal direction of the bracket is the first link 21
This component force Fr acts directly on the pivot joint between the inner cylinder 22 and the mounting bolt 9, and this moment acts on the first link 21 in a counterclockwise direction around the inner cylinder 22 and the mounting bolt 9. 4
1 to the upper surface part 7a of the step part 7 of the rear frame 6.
The first link 21 is elastically loaded by the bolt 9
It can oscillate elastically around the center. A moment due to a force opposite to the component force Fr is elastically borne by the rear surface portion 7b of the elastic portion 7 via the elastic receiving piece 42.
In addition, the moment due to the radial component force Fθ acting on the support brackets 35 and 36 is
36, the elastic receiving piece 44, the cap 47, the nut 48, and the bolt 29 are supported by the mounting bolt 9, so the second link 30 can elastically swing around the bolt 45, and the second link 30 can swing elastically around the bolt 45, and The vibrations and impacts are damped by compressive elastic deformation of the elastic receiving piece 44. The moment due to the force in the opposite direction to the radial force Fθ is elastically borne by the elastic receiving piece 43.

In this way, no matter how the force acting on the front body part 2 from the rear body part 10 changes in any direction along the longitudinal vertical plane of the vehicle body through the central axis of the mounting tube 40, the elastic receiving pieces 41, 42 Since the force is elastically borne by one of the elastic receiving pieces 43 and 44, vibrations of the engine 11 and vibrations or shocks caused by running are effectively and reliably damped.

Furthermore, the vibrations or shocks accompanying the vibration of the engine 11 and running are absorbed by the compressive elastic deformation of the elastic receiving pieces 41, 42, 43, and 44, so the elastic receiving pieces 4
No unreasonable shearing force is applied to 1, 42, 43, and 44, improving durability.

Furthermore, the buffering means is not an oleo device;
Because of the elastic receiving pieces 41, 42, 43, and 44, the structure is extremely simple and compact, and the cost is low.

In the embodiment illustrated in FIGS. 1 to 6, the first
The inner cylinders 22, 31 and the outer cylinders 25, 34 of the link 21 and the second link 30 are able to rotate relatively freely via bearings 23, 32.
As shown in the figure, the outer cylinders 25 and 34 are integrally baked with the lapper bushing 50, the inner cylinders 22 and 31 are divided into a plurality of pieces in the longitudinal direction, and the predetermined divided inner cylinders 22a and 31a are attached to the inner peripheral surface of the rubber bushing 50. Separated inner cylinder 2 by integrally baking and tightening bolts and nuts
2, 31 are integrated with each other, and the inner and outer cylinders 22, 25,
When the spring force of the rubber bushing 50 is applied between the elastic receiving pieces 41 and 4,
In cooperation with the elasticity of Nos. 2, 43, and 44, even more effective cushioning performance can be exhibited.

Further, since not only the rubber bush 50 but also bearings 23 and 32 made of oil-less bearings are interposed between the inner and outer cylinders 22, 25, 31, and 34, the lateral rigidity of the coupling device is high.

Furthermore, if no downward force (clockwise moment in Fig. 8) is applied from the rear body part 10 to the front body part 2, the support brackets on both the right and left sides of the first link 21, as shown in Fig. 8, 26,2
The impact branches 26a, 27a of 7 may both be directed forward, and substantially the same effects as the embodiments shown in FIGS. 1 to 6 can be achieved.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating an embodiment of the vehicle body coupling device for small motorcycles according to the present invention;
The figure is a longitudinal sectional view taken along the - line in Figure 1, Figure 3 is a side view showing the embodiment applied to a scooter-type motorcycle, and Figure 4 is an exploded perspective view of this embodiment. , FIG. 5 and FIG. 6 are perspective views of the first and second links of the same embodiment, FIG. 7 is a longitudinal sectional view of the embodiment of the present invention, and FIG. 8 is a side view of still another embodiment. 9 and 10 are a cross-sectional view and a vertical cross-sectional view of a conventional vehicle body coupling device. 1... Power unit type scooter type motorcycle, 2... Front body part, 3... Handle, 4...
...Front fork, 5...Front wheel, 6...Rear frame, 7...Step, 8...Bracket, 9...
Mounting bolt, 10... Rear body part, 11...
Engine, 12...Transmission case, 13...Rear wheel,
14...Buffer, 15...Bracket, 20...
Vehicle body coupling device, 21... first link, 22... inner cylinder, 23... bearing, 24... washer, 25...
Outer cylinder, 26...Left side support bracket, 27...Right side support bracket, 28...Mounting piece, 29...
Bolt, 30...Second link, 31...Inner cylinder, 3
2... Bearing, 33... Washer, 34... Outer cylinder, 35... Support bracket, 36... Support bracket, 37... Reception plate, 38... Hole, 40...
Mounting tube, 41... Elastic receiver piece, 42... Elastic receiver, 43... , 44... , 45...
Bolt, 46...Nut, 47...Cap, 4
8...Natsuto, 49...Boruto.

Claims (1)

[Scope of utility model registration request] a first link pivotally supported on one vehicle body portion; a first compressive elastic member interposed between the one vehicle body portion and an impact branch of a support bracket of the first link; A second link is pivotably supported at the tip of the support branch of the support bracket of the first link in a direction perpendicular to the support branch and is pivotable about an axis parallel to the pivot axis of the first link. link and the first
a shaft portion integrally projecting from the link; a receiving portion slidably and loosely fitted onto the shaft portion and integrally projecting from the second link; and a receiving portion removably attached to the tip of the shaft portion. a regulating means for regulating relative rocking of the first link and the second link, each of which is a locking portion;
a second compression elastic member interposed between the receiving part of the regulating means and the first link and between the receiving part of the regulating means and the locking part, and a second compression elastic member is provided at the tip of the second link. A vehicle body coupling device for a small vehicle such as a motorcycle, characterized in that the other vehicle body is pivotally attached to the other vehicle body so as to be swingable about an axis parallel to the pivot shaft.