JPS62120288A - Car body coupler for minicar - 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 characterized in that the vehicle body is divided into front and rear parts like a scooter, and the front and rear divided vehicle body parts are relatively freely swingable in the vertical direction and can be freely approached and separated in the front and rear directions. The present invention relates to a vehicle body connection device for a small vehicle connected to a vehicle.

A scooter-type motorcycle whose drive device is a power unit that integrates the engine and a transmission case containing a chain, etc. that transmits the engine power to the rear wheel! In liI,
In addition to connecting the power unit to the vehicle body via a rear wheel shock absorber, the front part of the power unit is also connected to the vehicle body for 11 vertical movements.

In such power unit type scooter type motorcycles, in order to prevent engine vibrations and vibrations caused by running due to uneven road surfaces from propagating to the vehicle body, the connection between the front part of the power unit and the vehicle body is connected by a link. something is proposed.

As a device that meets these requirements, Japanese Patent Application Laid-Open No. 57-1
There is a vehicle body connection device for a motorcycle described in Japanese Patent No. 94176, and this vehicle body connection device is an articulated link connection having a degree of freedom of swinging in two directions, as shown in FIGS. 1 and 2. It was composed of structures.

However, the first link 01. The rubber bushes 04.05.06 that elastically support the second link 02 and the power unit 03 respectively have inner and outer cylinders 07.08.09°010, 011. 012 is integrally baked,
Since the torque acting on the articulated link engagement structure is borne by the elastic torsional deformation of the barbushico 04.05.06, there is a restriction in bearing a large load.

In order to eliminate such inconveniences, the present applicant filed Utility Model Application No. 103063/1983 on July 10, 1981.

The vehicle body coupling device for a small vehicle of this application is constructed as shown in FIG.

The first link 0 is adjacent to the frame stepped portion 020 of the front body portion of the power unit type scooter type motorcycle.
21 is rotatably supported on the front vehicle body portion via a bolt 022, and elastic receivers 025, . 0
26 is attached, and the second link 02 is attached to the tip support bracket 027 of the first link 021 via the bolt 02g.
The base 030 of the second link 029 is pivotally supported, and the plate 031 that is integral with the base 030 of the second link 029 passes through a bolt 032 that is integral with the first link 021. Pieces 633 and 034 are screwed onto the tip of pole l-032 and pressed by Natsu l-035.
(The end of the second link 029 is attached to the cylinder 037 on the rear body part) 038 is pivotally mounted.

The vehicle body connection device shown in FIG.
8 to the end of the second link 029 (if a force F is applied to the cylinder 037, this force F is decomposed into a component in the longitudinal direction of the second link 029, ``r'', and a component Fθ in the direction perpendicular to this). , ``r is elastically borne by either one of the elastic receivers U 25 25, and 6, ``θ is the elastic receiver 033.
, 034 -115, and these elastic supports are pieces 025, 033.

034 is such that only the compressed element is added.

However,
As shown in FIG. 83, an excitation force P along the cylinder direction acts on the engine, but it is necessary to suppress the vibration of the power unit due to this excitation force P and prevent this vibration from being transmitted to the front vehicle body. In order to do this, the shock absorber may be tilted forward to exert a longitudinally directed force on the coupling device.

As a result, in the vehicle body coupling device shown in FIG. 3, a large load is always applied to the piece 034 of the elastic receiver, but since the piece 034 of the elastic receiver is made of rubber, the load and deformation are non-linear. There is a relationship, and the size of the piece 034 of the elastic receiver is limited, and when a large load is applied to the elastic receiver 1) piece 034, its spring constant increases, and the excitation force of the power unit increases. It is difficult to absorb enough P.

. The present invention relates to the improvement of a vehicle body connection device for small vehicles that overcomes these difficulties, and includes a jointed body that can swing in two directions by integrally interposing torsionally elastic bushings in the inner and outer cylinders. In a vehicle body connection device for a small vehicle in which one vehicle body portion and another vehicle body portion are elastically connected by a link connection structure, both ends of the articulated link connection structure are connected to the torsionally elastic bushings in a separate horizontal manner. By elastically connecting the compression elastic body oriented in the direction, the force acting in the front and rear directions on the two vehicle body parts can be divided and borne by the torsion elastic bushing and the compression elastic body. The torsionally elastic bushing and the compression elastic body can be given a load that does not increase the spring constant.

Hereinafter, an embodiment of the present invention shown in FIGS. 4 to 8 will be described in which the present invention is applied to a power uni 91-type scooter type motorcycle.

The power unit type scooter type motorcycle 1 consists of a front body part 2, which is usually called a body, and a rear body part 3, which is called a power unit.
It is constructed by integrating an engine 4, a transmission case 5 which is equipped with a transmission means for changing and transmitting the power of the engine 1 to the rear wheels 6, and a transmission means such as a chino. The axle of the rear wheel 6 is rotatably supported 1
゜Furthermore, the front body part 2 and the rear body part 3 are connected by a body coupling device 20 at the rear of the rear body part 3, and a slackener 7 tilted forward at the top and rear of the rear body part 3. , are elastically connected so that they can relatively swing along a vertical plane and move up and down and back and forth.

Furthermore, the vehicle body coupling system @20 is configured as described below.

First, move the main frame 8 of the front body part 2 to step 9.
The upper end of the resistant vessel 7 is pivotally connected to a cross member 10 that passes through both sides of the lower part and is curved upward, and is installed at the rear end of the cross member 10. Below the curved part, a reinforcing bracket 11 is welded to the body. The left and right main frames 8 are fixed together by a cross member 12 in front of the reinforcing stays 11.
is integrally connected to phase n by.

Further, the reinforcing stay 11 is provided with a hole 13, and this hole 13
The inner cylinder 22 of the first link 21 is attached to the support shaft 14 passing through the inner cylinder 22 of the first link 21.
are fitted, and the inner cylinder 22 is divided into several parts Wi in the axial direction,
Rubber bushings 23 are integrally baked into the two internal short tubes 22a, and the outer periphery of the rubber bushings 23 is also baked integrally with the steel sleeve 24, and the steel sleeve 24 is integrally fitted into the outer tube 25. bearings 26. are mounted on both ends of the inner cylinder 22 and outer cylinder 25. A washer 27 is interposed, and the hole 13
By screwing and tightening the nut 15 to the tip of the support shaft 14 which penetrates through the inner cylinder 22 and is fitted into the inner cylinder 22, the inner cylinder 22 is fixed to the reinforcing suite 114; It is designed to be elastically rotatable with respect to the inner cylinder 22.

Furthermore, the outer cylinder 25 has a bifurcated point support 28 and a holding bracket 1.
A rubber piece 46 is attached to the tip of this bifurcated point support 28, and this rubber piece 46Lt is in contact with the cross member 12 so as to sandwich it therebetween. Due to the contraction deformation of the piece 4G, it swings elastically around the support shaft 14 (7.
There is.

Furthermore, pass d through the hole 30 of the support plate 29.
The inner cylinder 32 of the second link 31 is fitted into the support @ 38, and the inner cylinder 32 is also divided into a plurality of parts in the axial direction: two of these short cylinders 32a have a rubber bushing 33 integrated with them ( The outer periphery of the rubber bushing 33 is made of steel sleeve 3.
The Il sleeve 34 is also baked integrally with the outer cylinder 3.
5, a bearing 3G and a washer 37 are interposed at both ends of the inner cylinder 32 and outer cylinder 35, and the hole 30
At the tip of the support shaft 38 that penetrates through and is fitted into the inner cylinder 32
- By screwing and tightening the bolts 39, the inner cylinder 32 is integrally fixed to the support bracket 29 of the first link 21.
The outer cylinder 35 is elastically rotatable relative to the inner cylinder 32.

In addition, a support bracket 40 is integrally fixed to the outer cylinder 35, and a cylinder 41 is attached to the tip of the support bracket 40, and the cylinder 41 is fitted onto a bolt 42 passing through the rear body portion 3. By screwing together a nut 43 at the tip of this bolt 42, the support bracket 40 is pivotally attached to the rear vehicle body portion 3.

Furthermore, when attaching the outer cylinder 25 of the first link 21 and the second link 31, a protruding piece 44 and a lever 45 are integrally fixed to the cylinder 41, and a rubber bushing is attached to the rear end of a shaft 49 that passes through the protruding piece 44. A sleeve 54 is attached through the lever 53, and the sleeve 54 and the lever 45 are connected with a bolt nut 55.
Compressed rubber pieces 47 and 4 are attached to this shaft 49 with the protruding piece 44 in between.
8 is loosely fitted, and a receiver piece 50 is fitted in front of this compressed rubber piece 48.
is arranged, and a nut 5 screwed onto the tip of the shaft 49
1, the compressed rubber piece 48 can be held between the projecting piece 44 and the receiving piece 50.

Further, the tip of the shaft 49 is connected to the mounting piece 16 of the front body part 2 via a tension coil spring 52.

The embodiments shown in FIGS. 4 to 8 are constructed as described above, and as shown in FIG. , loose 1
1i37 horizontally backward due to the supporting reaction force W si
A horizontal force nθ is generated and acts on the vehicle body coupling device 20.

This horizontal force W sin θ is a spring force generated by torsional deformation of the rubber bushings 23, 33, a spring force generated by compressive deformation of the rubber piece 46 and the compressed rubber piece 48, and a spring force generated by tensile deformation of the tension coil spring 52. Since the burden is divided into parts, each rubber bushing 23
．． 33. Rubber piece 46. The compressed rubber piece 48 has a large spring constant and is not under such a load condition that the rubber bush 23.
33. The rubber piece 4G and the compressed rubber piece 48 are easily elastically deformed;
It is possible to sufficiently absorb the excitation force P of the engine 4 and the vibration force when steering on an uneven road surface.

Furthermore, when a horizontal forward force acts on the vehicle body coupling device 20 due to sudden braking of the front wheels (not shown) or sudden acceleration of the engine 4, this instantaneous horizontal force is applied to the rubber bush 23.
．． The spring force generated by the torsional deformation in the opposite direction of the rubber bushings 23, 33. Rubber piece 46. No large load is applied to the compressed rubber piece 47, and this instantaneous horizontal force is transferred to the rubber bushings 23.33. Rubber piece 46. Compressed rubber pieces 47 can be absorbed.

Furthermore, rubber bushings 23.33. Since no excessive load is applied to the rubber piece 4G and the compressed rubber piece 47.48, the rubber bushings 23.33. Rubber piece 46. Compressed rubber piece 47.48
Good durability.

In the embodiment described above, the tip of the shaft 49 is connected to the attachment piece 16 of the front body part 2 via the tension coil spring 52, but depending on the arrangement of the shock absorber 7, the tension coil spring 52 may be omitted. You can also do that.

As described above, in the present invention, it is possible to apply a load to the torsion pressing bush and the compression elastic body to the extent that the spring constant thereof does not become large. It is possible to sufficiently absorb engine vibrations acting between the two city body parts and vibrations caused by driving due to uneven road surfaces.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional side view of a conventional motorcycle body coupling device, Fig. 2 is a longitudinal sectional view taken along line II-I in Fig. 1, and Fig. 3 is another conventional vehicle body coupling device. side view,
FIG. 4 is a partially cutaway side view of an embodiment in which the vehicle body coupling device for a small vehicle according to the present invention is applied to a power unit type scooter type motorcycle, FIG. 5 is a partially cutaway plan view thereof, and FIG. 7 is a longitudinal sectional view taken along the line Vl-Vl in FIG. 6, and FIG. 8 is an explanatory diagram illustrating that horizontal force acts on the embodiment. . 1...Power unit type scooter type motorcycle, 2.
...Front body part, 3...Rear body part, 4...Engine, 5...Transmission case, 6...Rear wheel, 7...
Buffer, 8... Main frame, 9... Step,
10...Cross member, 11...Reinforcement stay, 1
2... Cross member, 13... Hole, 14... Support shaft, 15... Nut, 16... Single mounting, 20...
...Vehicle body coupling device, 21...First link, 22...
Inner cylinder, 23...Rubber bushing, 24...WI sleeve 25...Outer cylinder, 26...Bearing, 27...Washer, 28...Bifurcated support piece, 29...Support Bracket, 30... hole, 31... second link, 32...
...Inner cylinder, 33...Rubber bushing, 34...Steel sleeve, 35...Outer cylinder, 36...Bearing, 37...
Washer, 38...Support shaft, 39...Nut, 40
...Support bracket, 41...Mounting tube, 42...
・Bolt, 43...Nut, 44...Protrusion, 45・
... Lever, 46 ... Rubber piece, 47.48 ... Compressed rubber piece, 49 ... Shaft, 50 ... Holder piece, 51 ...
Nut, 52...Tension coil spring, 53...
Rubber bushing, 54...sleeve, 55...bolt nut.

Claims (1)

[Claims] A body for a small vehicle, in which one body part and the other body part are elastically connected by an articulated link connection structure that is integrally interposed with a torsionally elastic bushing in the inner and outer cylinders and can swing in two directions. A vehicle body coupling device for a small vehicle, characterized in that both ends of the articulated link coupling structure are elastically coupled by a horizontally oriented compression elastic body separate from the torsionally elastic bushing.