JPH0448675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a restoring force generating device for a rocking tricycle in which a front vehicle body and a rear vehicle body are pivotally connected.

(Prior art) A front vehicle body that supports one front wheel and a rear vehicle body that supports two rear wheels are swingably connected via a connecting member provided in the longitudinal direction of the vehicle body on the left-right center line of the vehicle body. As a restoring force generating device for a type tricycle, as disclosed in Japanese Patent Publication No. 16411/1983, elastic members of a required length are provided on the left and right sides of the connecting member between the front and rear bodies, and both elastic members are connected in the longitudinal direction. It is known that the restoring force is obtained through the elastic deformation of the material. However, in such a restoring force generating device, since elastic members are disposed on the left and right sides of the connecting member, space is required on the left and right sides, making it impossible to make the device compact, and two elastic members are required. There were problems such as the number of parts to be installed increased and the number of parts had to increase.

(Object of the Invention) The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to reduce the number of parts, make the device more compact, and provide a swing type device with a simple structure. The present invention provides a restoring force generating device for a tricycle.

(Structure of the Invention) In order to achieve the above object, the present invention provides an elastic member in a direction that stands up with respect to the axis of the connecting member, and one end of the elastic member is pivotally connected to a location on the left-right center line of the front vehicle body. At the same time, the other end is pivoted on the left-right center line of the rear vehicle body and at a location deviating from the axis of the connecting member, and the elastic member is elastically deformed in accordance with the left-right rocking of the front vehicle body. It is characterized in that the restoring force is obtained by the members.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a left side view of the rocking tricycle, and FIG. 2 is a diagram showing the relationship between the front and rear vehicle bodies and the elastic members when turning from side to side as seen from the rear of the vehicle body.

The rocking tricycle 1 includes a front body 2 and a rear body 3. A head tube 4 is provided at the front of the front body 2, and a front wheel 5 serving as one steering wheel is supported by a front fork 6 inserted through the head tube 4. However, a handle 7 and a headlight unit 8 are attached to the upper part of the front fork 6.

At the rear of the front vehicle body 2, a seat post 11 is installed diagonally upward, a seat 12 is provided at the upper end of the seat post 11, and a bracket 13 is attached to the middle part of the seat post 11 facing backward. A joint case 14 is attached toward the rear near the rear end of the vehicle body 2 and the lower end of the seat post 11.

A shaft 15 is rotatably attached to the joint case 14, and the shaft 15 extends rearward, and the axis 16 of the shaft 15 is located between the left and right center of the front body 2 and the right and left of the rear body 3 when the tricycle 1 is viewed from above. A bracket 17 is fixed to the rear end of the shaft 15 so as to match the center.

The rear vehicle body 3 includes a loading platform 21 whose lower front end is attached and fixed to the bracket 17, and a rear fork 23 whose front end is pivoted to a pivot shaft 22 installed horizontally on the bracket 17 and extends rearward. A power unit 25 equipped with an engine 24 is attached and fixed to the vehicle, and the power unit 25 drives the two rear wheels 26 and 26 arranged on the left and right sides, respectively, and the rear action unit 27 provided between the cargo platform 21 and the power unit 25 generates power. If we consider that the unit 25 and the two rear wheels 26, 26 are suspended and supported, and therefore the rear body 3 is fixed, then the front body 2 can rotate freely around the shaft 15, and if we consider that the front body 2 is fixed, then the power Unit 25 and rear two wheels 26,2
6 is vertically swingable about a pivot shaft 22. In the embodiment, the shaft 15 and the rear vehicle body 3 are fixed, so the shaft 15 forms a part of the rear vehicle body 3.

31 is a restoring force generating device;
In the embodiment, it is provided between the bracket 13 attached to the seat post 11 and the shaft 15.

The restoring force generating device 31 includes an elastic member 32, and the elastic member 32 includes an upper member 34 having a cylindrical portion 33, and an upper portion inserted into the cylindrical portion 33 and extending downward. Rod-shaped lower member 35 to be removed
and a coil spring 36 compressed between the bottom of the cylindrical portion 33 and the upper end of the lower member 35, and the elastic member 32 is always biased by the coil spring 36 in a direction in which its overall length is reduced. 1 is arranged so that the elastic member axis 41 is located on the left and right center of the front and rear vehicle bodies 2 and 3 when viewed from above, and the axis 41 stands up with respect to the shaft axis 16 when viewed from the side. Although the two axes 41 and 16 intersect substantially at right angles in this example, the angle at which the axes 41 and 16 intersect may be arbitrary and may not be parallel to each other.

The elastic member 32 is attached to the vehicle body using the cylindrical portion 3.
3. A mounting portion 42 protruding from the upper surface and a mounting piece 43 provided on the bracket 13 are pivotally connected via a support shaft 44,
Also, the joint case 14 in the shaft 15
Mounting piece 4 provided at the location facing between the and bracket 17
5 and the lower end of the lower member 35 are pivotally connected via a support shaft 46, and the support shafts 44 and 46 are connected to the shaft 15, respectively.
, and the lower support shaft 46 is offset e with respect to the shaft axis 16.

Since this embodiment is configured as described above, when the front vehicle body 2 swings to the left during a left turn, for example, as shown in FIG. The elastic member 32 is tilted to the left with a radius R centered on the support shaft 46, and the elastic member 32 is tilted leftward with a radius r centered on the support shaft 46. The coil spring 36 is expanded against the elastic force of the spring 36, while the coil spring 36 is compressed, and the compression reaction force of the coil spring 36 provides a restoring force to return the front vehicle body 2 to a neutral state. That is, only one elastic member 32 is required to obtain the restoring force, and therefore the number of parts of the restoring force generating device can be reduced and the device can be made more compact.

In addition, the upper and lower support shafts 44 and 46 of the elastic member 32 are made parallel to the shaft axis 16, that is, the center of swing of the front vehicle body 2, and are rotatably attached to the front and rear frames 2 and 3, respectively, so that the left and right swings of the elastic member 32 are Movements are also smooth.

Furthermore, the swing center 16 of the front vehicle body 2 and the elastic member 32
Since the pivoting center 46 of the front vehicle body 2 is shifted e on the left-right center 51 of the vehicle body, as the inclination of the front vehicle body 2 becomes larger, the difference between the pivoting radii R and r due to the deflection e increases. The amount of compression of the coil spring 36 is increased in a quadratic curve to produce a progressive effect, which makes it easier to tilt the left and right front vehicle body 2 from a neutral state, giving the occupants a light feeling, and also makes it easier to tilt the left and right front body 2 from a neutral state. It acts as a force to strongly ground the rear measurement wheel 26, improving turning performance.

In the embodiment, the elastic member 32 that utilizes the elastic force of the compression spring 36 is used, but the elastic member 32 may be of a type that utilizes the elastic force of a tension spring. Instead of using a spring, for example, a hydraulic cylinder, a pneumatic cylinder, etc. may be used, and in short, the elastic member 3
2 may be any member that exhibits elastic force in response to deformation in the length direction, and the attachment locations of the elastic member 32 to the front and rear frames 2 and 3 are not limited to those in the embodiment.

(Effect of the invention) As is clear from the above explanation, according to the present invention,
Restoring force can be reliably obtained with a single elastic member, and the number of parts of this type of restoring force generating device for a rocking tricycle can be reduced, and the structure can be simplified and made more compact.

[Brief explanation of the drawing]

FIG. 1 is a left side view of the rocking tricycle, and FIG. 2 is a diagram showing the relationship between the front and rear vehicle bodies and the elastic members when turning from side to side as seen from the rear of the vehicle body. In the drawing, 2 is the front body, 3 is the rear body, 5 is the front wheel,
12 is the seat, 15 is the shaft, 26 is the rear wheel, 3
1 is a restoring force generating device, and 32 is an elastic member.

Claims (1)

[Claims] 1 In a rocking tricycle in which a front body supporting one front wheel and a rear body supporting two rear wheels are swingably connected via a connecting member provided in the longitudinal direction of the vehicle body on the left-right center line of the vehicle body. , an elastic member is provided in a direction standing up with respect to the axis of the connecting member, one end of the elastic member is pivotally connected to a location on the left-right center line of the front vehicle body, and the other end is pivoted to a location on the left-right center line of the rear vehicle body. A restoring force generating device for a rocking tricycle pivotally mounted at a location deviating from the axis of the connecting member.