JPH0717660Y2 - Rear axle mounting structure for electric tricycle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a rear axle mounting structure for an electric three-wheeled vehicle, which receives a reaction force of drive wheels with a simple structure.

(Prior Art) In an electric three-wheeled vehicle, usually the rear two wheels are drive wheels,
In order to obtain a compact size, the axle is made to protrude from the gear box to which the motor is attached to the left and right. in this case,
The reaction force when the rear wheels rotate is applied to the gear box, and it is necessary to absorb this.

(Problems to be solved by the invention) In the prior art, as a structure for this purpose, the gear box is directly fastened to the vehicle body (vehicle body frame) with bolts, or the gear box and the vehicle body are connected by a torque rod. It had the structure of a sword (for example, JP-A-57
-90213 and Japanese Utility Model Laid-Open No. 60-84321). Although it was possible to receive the reaction force by this, if the gear box was bolted to the vehicle body, it became necessary to provide a part for fixing the entire gear box in the center of the vehicle body (between the left and right wheels), and the structure became complicated. Also, in the case of using a torque rod, securing a space for installing the torque rod prevents miniaturization, and it is said that sufficient effect cannot be obtained unless the length and size of the torque rod are properly selected. There was a problem. Further, there is a problem that the uneven vibration from the road surface input from the driving wheels cannot be sufficiently absorbed.

The present invention has been made to solve the above problems,
The gearbox is supported at one place on the body frame to absorb the reaction force when the drive wheels rotate, and at the same time, the rear axle is supported at two places on the body frame to simultaneously absorb the vibration from the road surface, and An object of the present invention is to provide a rear axle mounting structure for an electric three-wheeled vehicle, which has a simple structure and ensures a cushioning effect.

(Means for Solving the Problem) As a means for solving the above problems, the present invention extends in the front-rear direction of a vehicle body and has a rear portion having a stepped shape that rises upward, and is arranged in parallel with each other. A body frame having two side members, and the two side members,
A bridge member that is coupled in a direction orthogonal to the front-rear direction of the vehicle body, one front wheel that is disposed in the front portion of the vehicle body frame, and a rear portion that is disposed in the rear portion of the vehicle body frame and is substantially parallel to the bridge member. Two drive rear wheels mounted outside the side members at both left and right ends of a rear axle that is inserted into and supported by the axle tube, a gear box provided substantially in the center of the axle tube, and the gear box In a rear axle mounting structure of an electric tricycle, which is mounted on one side surface and has a rotation shaft and a drive motor arranged substantially parallel to the axle tube, a rear step mounting base of each of the side members is substantially An auxiliary member for connecting the rear end portion, a semi-circular bracket provided at the rear portion of the auxiliary member, a plate for attachment provided rearward at substantially the center of the bridge member, and a gear box On the front side A protrusion that engages with a mounting plate is provided, and while supporting the semi-circular bracket from the rear of the axle tube with a retainer via an elastic material in a slit case, the protrusion is used for mounting. The plate is mounted and supported via an elastic material, and the entire drive mechanism including the drive motor, the gear box, and the axle tube is mounted and supported on the body frame at three locations.

(Operation) As described above, according to the present invention, the protrusion of the gear box is mounted and supported on the plate of the bridge member provided between the two side members via the elastic member, and at this one mounting portion, The drive motor receives a reaction force when the rear axle rotates.

In addition, with respect to the semicircular bracket provided at the rear of the auxiliary member, two parts of the axle tube are attached and supported from the rear by a retainer via elastic materials with slits, and driven by these two attachment parts. Absorbs road surface unevenness vibration input from the wheel.

Further, the entire drive mechanism including the drive motor, the gear box and the axle tube is attached to the vehicle body frame at three points via the elastic material, and the position errors at these three points are absorbed by the elastic material.

Also, three parts of the entire drive mechanism are attached to the vehicle body frame to facilitate the attachment / detachment of the entire drive mechanism.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1 in which an essential part is shown in an exploded state. Reference numerals 1 and 2 denote side members forming a part of the vehicle body frame, that is, two side pipes. The side pipes 1 and 2 are arranged in parallel with the vehicle body in the front-rear direction, and the rear portions thereof have a stepped shape that rises upward. The side pipes 1 and 2 have a front portion (left portion in the figure) not shown reaching a suspension portion of one front wheel, and a seat (not shown) is attached to the upper portion thereof.

A bridge pipe 3, which is a bridge member, is bridged between the side pipes 1 and 2 in a direction orthogonal to the front-rear direction of the vehicle body. A plate 19 for attachment facing rearward is provided at a substantially central portion of the bridge pipe 3. plate
A hole 21 is formed in 19.

In addition, auxiliary pipes 4 and 5, which are auxiliary members curved downward, are provided between the bases of the side pipes 1 and 2 in the rising step shape and the substantially rear end portions. Semicircular brackets 14 and 15 facing rearward are attached to the rear sides of the auxiliary members 4 and 5, and a semicircular recess is formed in the center of the brackets 14 and 15.

Axle tubes 12 and 13 connected to each other via a gear box 6 are provided in the rear portion of the vehicle body frame, that is, the side pipes 1 and 2 substantially in parallel with the bridge pipe 3.
Rear axles 8 and 9 are respectively inserted into and supported by 13. Rear axle 8,9
Respectively project to the left and right of the axle tubes 12 and 13, and rear wheels 10 and 11 as driving rear wheels are attached to the tips of the projecting rear axles 8 and 9, respectively. That is, the rear wheels 10, 11 are the side pipes 1, 2
It is mounted on the rear axles 8 and 9 on the outer side of.

Further, a drive motor 7 is mounted on one side surface of the gear box 6 provided substantially in the center of the axle tubes 12 and 13. A rotation shaft (not shown) of the drive motor 7 is mounted substantially parallel to the axle tube 12. By this connection, the rotational force of the drive motor 7 is reduced by the gears in the gear box 6, and this rotational force is transmitted to the rear wheels 10 and 11.

Further, a flange-shaped projection 20 which is provided on the bridge pipe 3 and engages with a plate 19 for attachment is integrally formed with the gear box 6 at a front portion of the gear box 6 (a part in a direction intersecting with the axles 8 and 9). Has been formed. The protrusion 20 is provided with a hole 22.

Then, the projection 20 of the gear box 6 and the plate 19 for mounting the bridge pipe 3 are connected via a mount rubber 23 which is an elastic material. That is, the male screw 25 protruding to the lower portion of the mount rubber 23 is passed through the hole 22 of the protrusion 20 of the gear box 6 and fixed by the tightening nut 27. Further, a male nut 24 projecting above the mount rubber 23 is passed through the hole 21 of the plate 19 of the bridge pipe 3 to tighten the nut 26 for tightening.
Fix with. As a result, the gear box 6 is attached to and supported by the bridge pipe 3 via the mount rubber 23. That is, the gear box 6 is supported by the bridge pipe 3 at the projection 20 and one place.

The axle tubes 12 and 13 are attached and supported by brackets 14 and 15 provided on the auxiliary pipes 4 and 5 via a retainer 17 and a bolt 18 via a rubber bush 16 which is an elastic material having a slit in the axial direction. ing. The rear wheel 11 side in the figure is similar, but is not shown. That is, the axle tubes 12 and 13 are supported at two locations from the rear by the rubber bush 16 and the like.

When the electric tricycle configured as described above travels, the reaction force of the driving force is applied to the gear box 6 and the axle tubes 12 and 13. Since the axle tubes 12 and 13 are fixed to the auxiliary pipes 4 and 5 by the retainer 17 via the rubber bush 16, the reaction force cannot be received at this portion. Therefore, the reaction force is received by one mounting portion of the gear box 6. FIG. 2 shows a portion of the mount rubber 23 in this state, and shows that the mount rubber 23 is deformed and absorbs a reaction force.

And the brackets 14 and 15 provided on the auxiliary pipes 4,5
From the rear of the axle tubes 12, 13 from the rear, the rubber bush 16
Since it is attached and supported by the retainer 17 and the bolt 18 via the, the uneven vibration of the road surface input from the drive wheels 10 and 11 is absorbed by the rubber bushes 16 at these two places.

In the embodiment described above, male screws are mounted above and below the mount rubber 23.
24 and 25 are provided, and the gearbox 6 is attached to the bridge pipe 3 by the nuts 26 and 27 of the male screws 24 and 25, but this portion may have another structure. FIG. 3 shows an example thereof. The plate 19 projecting from the bridge pipe 3 is formed into a U shape (a box shape may be opened only at the rear side), and a mount rubber 23 interposed between the plate 19 and the projection on the gear box 6 side is provided. I have inserted 20. Even with such a structure, the reaction force in the direction indicated by the arrow can be effectively received.

(Effect of the Invention) As described above, according to the present invention, the protrusion of the gear box is mounted and supported on the plate for mounting the bridge member provided between the side members via the elastic material. The elastic material of the mounting portion can reliably receive the reaction force when the rear wheel rotates by the drive motor. As a result, the structure of the reaction force buffering section can be simplified and the size can be reduced.

Further, since the bracket provided on the auxiliary member has two parts of the axle tube mounted and supported by the retainer or the like via the elastic material,
The uneven vibration of the road surface input from the drive wheels can be absorbed by the elastic members at the two mounting portions.

Since the three parts of the entire drive mechanism including the drive motor, the gear box, and the axle tube are attached to the vehicle body frame via the elastic material, that is, the protrusions of the gear box are connected to the plate of the bridge member via the elastic material. Support it in one place, and further attach the axle tube to the body frame through elastic material.
Since the structure is such that the mounting portions are supported, it is possible to easily absorb the positional error (error in the mounting dimension) at these three positions of the mounting portion by the elastic material. This makes it easier to maintain the accuracy of related parts, which improves workability and is advantageous in cost.

Further, since the entire drive mechanism is attached to the vehicle body frame at only three places in this manner, the entire drive mechanism can be easily attached and detached, and the maintainability can be significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of an embodiment of the present invention in an exploded state, and FIG. 2 is a side view showing an operating state of the one shown in FIG.
FIG. 3 is a side view of another embodiment of the present invention. 1,2 ... Side pipe, 3 ... Bridge pipe 4,5 ... Auxiliary pipe, 6 ... Gearbox 7 ... Drive motor, 8,9 ... Axle 10,11 ... Rear wheel, 12,13 ... Axle pipe 14,15 ... Bracket, 16… Rubber bush 17… Retainer, 19… Plate 20… Protrusion, 23… Mount rubber

Claims (1)

[Scope of utility model registration request] 1. A vehicle body frame having two side members extending in the front-rear direction of the vehicle body, the rear portion of which is raised upward, and having two side members arranged in parallel with each other, and the two side members. A bridge member that is coupled in a direction orthogonal to the front-rear direction of the vehicle body, one front wheel that is disposed in the front portion of the vehicle body frame, and a rear portion that is disposed in the rear portion of the vehicle body frame and is substantially parallel to the bridge member. Two drive rear wheels mounted outside the side members at both left and right ends of a rear axle that is inserted into and supported by the axle tube, a gear box provided substantially in the center of the axle tube, and the gears. In a rear axle mounting structure for an electric tricycle, which is mounted on one side surface of a box and has a drive motor whose rotating shaft is arranged substantially parallel to the axle tube, a base of a rising step portion of each of the side members, With the rear end An auxiliary member to be coupled, a semi-circular bracket provided at the rear portion of the auxiliary member, a mounting plate provided rearward at approximately the center of the bridge member, and at the front side of the gear box, A projection that engages with a mounting plate is provided, and while supporting the semi-circular bracket from the rear of the axle tube with a retainer via a slitted elastic material, the projection is used for the attachment. A rear of an electric tricycle characterized in that the plate is mounted and supported via an elastic material, and the entire drive mechanism including the drive motor, the gear box, and the axle tube is mounted and supported on the vehicle body frame at three locations. Axle mounting structure.