JPH05155373A - Motor tricycle - Google Patents

Abstract

PURPOSE:To endow a joint for connecting the vehicle body frame and a power unit with a simple structure and durability. CONSTITUTION:A rocking axis 16 extended in the transversal direction of a motor tricycle 1 is provided in a car body frame 2, the base end part (a pivot pipe 22) of a swing arm 12 extended rearward is rotatably pivoted to the rocking arm 16, and rocking rotary axes 17 and 17 overlapping on the plane center line A of the motor tricycle 1 are provided on the swing arm 12, and a power unit 11 is rotatably pivoted to the rocking rotary axes 17 and 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-wheeled motor vehicle in which a power unit is swingably and swingably connected to a body frame.

[0002]

2. Description of the Related Art Most of the three-wheeled motor vehicles have a power unit (in which an engine and a power transmission device are integrally formed) in which a pair of left and right rear wheels are pivotally supported on a vehicle body frame which steerably supports front wheels. The power unit is swingable and swingable around the joint with the rear wheel. Therefore, the shock applied to the rear wheels from the road surface while traveling is absorbed by the swing of the power unit, and the body frame leans to the side while the left and right rear wheels are grounded during cornering, and the motorcycle is You can bend smoothly by moving the center of gravity to the inside of the curve.

[0003]

However, in such a three-wheeled motor vehicle, as described above, the power unit needs to be capable of swinging and swinging with respect to the vehicle body frame. Therefore, the joint portion connecting the vehicle body frame and the power unit to each other is required. Had a problem that the structure was complicated, the cost was high, and the durability of the joint was low.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a three-wheeled motor vehicle having a simple structure and high durability in a joint portion connecting a vehicle body frame and a power unit. And

[0005]

In order to achieve the above object, a three-wheeled motor vehicle according to the present invention has a body frame that supports steerable front wheels, and a power unit in which a pair of left and right rear wheels are pivotally supported. In a three-wheeled motor vehicle that is swingably and swingably connected to each other, a swinging shaft extending in the width direction of the three-wheeled motor vehicle is installed on a vehicle body frame, and a base end portion of a swing arm extending rearward is pivotally attached to the swinging shaft. At the same time, a swing shaft located on the center line of the plane of the motorcycle is installed on the swing arm, and the power unit is pivotally attached to the swing shaft.

[0006]

The power unit and the left and right rear wheels can swing together with the swing arm around the swing axis provided on the body frame, and at the same time, swing around the swing axis provided on the swing arm.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a motorcycle according to the present invention,
2 is a right side view, and FIG. 3 is a perspective view seen from the rear right side. These drawings show only the most basic components of the motorcycle, and the seating seat, frame cover, engine accessories, electrical components, etc. are all omitted.

The motorcycle 3 includes, for example, an underbone type vehicle body frame 2, and the vehicle body frame 2 includes a head pipe 6 for supporting a front fork 4 on which a front wheel 3 is pivotally supported together with a handlebar 5 so as to be steerable. A down tube 7 extending from the head pipe 6 to the lower rear,
Horizontal pipe 8 fixed to the rear end of the down tube 7.
And a rear frame 9 which extends from the both ends of the horizontal pipe 8 to the upper rear and supports a seat (not shown).

A power unit 11 having the same basic structure as that of a general two-wheel scooter is connected to a rear portion of the vehicle body frame 2 via a swing arm 12, and a pair of left and right rear wheels 13 are provided at the rear portion of the power unit 11. 14 is pivotally supported by a rear axle shaft 15.

A swing shaft 16 extending in the width direction of the motorcycle 3 is installed on, for example, a horizontal pipe 8 of the vehicle body frame 2, and the base end portion of the swing arm 12 extending rearward is pivotally attached to the swing shaft 16. To be done. Further, as shown in FIG. 1, the swing arm 12 is provided with swing shafts 17, 17 positioned on the plane center line A of the motorcycle 3 and spaced apart from each other in the front-rear direction. Eleven are pivotally attached.

FIGS. 4 and 5 show the swing shaft 16 and the swing shaft 1 described above.
7 shows an example of a pivot structure of 7,17. In this embodiment, the pivoting structure of the rocking shaft 16 and the rocking shafts 17, 17 is the same as the pivoting structure between the vehicle body frame and the power unit in a general two-wheel scooter.

The swing shaft 16 has a bolt shape and is supported between brackets 18 fixed to both ends of the horizontal pipe 8.
It is fixed with a nut 19. A spacer pipe 21 is inserted through the swing shaft 16 so as to be interposed between the brackets 18, 18, and a pivot pipe 22 serving as a base end portion of the swing arm 12 is provided on the outer periphery of the spacer pipe 21 with roller bearings 23, 23. It is rotatably supported via. The swing arm 12 is fixed to the pivot pipe 22 by welding or the like.

The swing shafts 17, 17 are supported between brackets 24, 24 fixed to the swing arm 12,
Fixed with nuts 25, spacer pipe 26
Is inserted between the brackets 24, 24, and a boss 28 of the power unit 11 is rotatably supported by a roller bearing 27 on the outer periphery of the spacer pipe 26.

Therefore, the power unit 11 and the rear wheel 1
The swing arms 3 and 14 are swingable around the swing shaft 16 of the body frame 2 together with the swing arm 12, and at the same time swing around the swing shafts 17 of the swing arm 12, and the left and right rear wheels 13 are provided. , 14 is grounded, the body frame 2 is leaned to the left and right, and the motorcycle 1 is smoothly and stably cornered.

The body frame 2 and the power unit 1
A shock absorber 29 is connected to the rearmost portion of each of the power supply units 1 to buffer the rocking shock of the power unit 11. The lower end 29a of this shock absorber 29 is
For example, as shown in FIG. 2, since it is positioned on the extension line B of the swinging shafts 17 and 17 and does not expand and contract due to lean of the vehicle body frame 2, the vehicle body frame 2 receives the reaction force of the shock absorber 29. You can lean smoothly without any problems.

In this motorcycle 1, the joint portion connecting the vehicle body frame 2 and the power unit 11 is constituted by a rocking shaft 16 and rocking shafts 17, 17 having a very simple and durable pivoting structure. 16 and swing axis 1
Since the pivoting structure between the vehicle body frame and the power unit in a general two-wheel scooter can be applied to the pivoting structures 7 and 17 as it is, the parts and the processing equipment can be shared, and the cost can be reduced. The joint is highly durable.

[0018]

As described above, in the motorcycle according to the present invention, the vehicle body frame for supporting the front wheels is steerable.
In a three-wheeled motor vehicle in which a pair of left and right rear wheels are pivotally supported to be swingable and swingable through joints, a swing shaft extending in the width direction of the three-wheeled vehicle is installed on a vehicle body frame. A swing shaft extending rearward is pivotally attached to the drive shaft, and a swing shaft located on the plane centerline of the motorcycle is installed on the swing arm, and the power unit is pivotally attached to the swing shaft. Is.

Therefore, the joint portion connecting the vehicle body frame and the power unit is formed of an extremely simple and durable pivot structure by the swing shaft and the swing shaft, and the cost is low and the durability is high.

[Brief description of drawings]

FIG. 1 is a plan view of a motorcycle according to an embodiment of the present invention.

FIG. 2 is a right side view of the motorcycle.

FIG. 3 is a perspective view of the motorcycle as viewed from the rear right side.

FIG. 4 is a plan sectional view showing a pivotal structure of a swing shaft.

FIG. 5 is a plan sectional view showing a pivotal structure of a rocking shaft.

[Explanation of symbols]

 1 Motorcycle 3 Body Frame 3 Front Wheel 11 Power Unit 12 Swing Arm 13, 14 Rear Wheel 16 Swing Axis 17 Swing Axis 21, 26 Spacer Pipe 22 Pivot Pipe 23, 27 Roller Bearing 29 as a Base End of Swing Arm Shock Absorber A Center line of the motorcycle

Claims (1)

[Claims] 1. A motorcycle comprising a vehicle body frame that steerably supports front wheels, and a power unit, in which a pair of left and right rear wheels are pivotally supported, swingably and swingably connected through a joint portion. A swing shaft extending in the width direction is installed on the body frame, and a swing arm extending rearward is pivotally attached to the swing shaft, and a swing shaft located on the plane center line of the motorcycle is provided on the swing arm. The motorcycle is characterized in that the power unit is pivotally attached to the swing shaft.