JP2018161962A - Tricycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tricycle that can be turned in a small radius.SOLUTION: A left swing arm 20 for a left wheel and a right swing arm 30 for a right wheel are supported on the left and right parts of a rear lower part of a vehicle body frame 2 so as to freely rotate vertically. An upper arm 41 and a lower arm 42 are supported on the upper part and lower part of the middle of the vehicle frame 2 so as to freely rotate vertically. At the respective rotatable ends of the upper arm 41 and the lower arm 42, an intermediate link 43 coupling upper and lower ends is provided. A shock absorber 44 is interposed between a rear part of the vehicle body frame 2 and the intermediate link 43. A rear-wheel position adjustment member 45 is supported on the intermediate link 43 so as to freely rotate using a forward/backward direction as an axial direction. In the rear-wheel position adjustment member 45, when a left portion moves upward/downward, a right portion moves downward/upward. A left control link 46 is coupled to the left side of the rear-wheel position adjustment member 45 and to the left swing arm 20, and a right control link 47 is coupled to the right side of the rear-wheel position adjustment member 45 and to the right swing arm 30.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a three-wheeled vehicle, and more particularly to a three-wheeled vehicle having two left and right rear wheels.

  Conventionally, there is a three-wheeled vehicle provided with two left and right rear wheels as described in FIG. 13 to FIG. 16 of Japanese Patent No. 3231067. In this three-wheeled vehicle, the rear body bracket 5 provided on the rear vehicle body swings left and right via a swing shaft on a swing bracket 95 supported on the front body bracket 3 provided on the front body frame 1 so as to freely swing up and down. The swing bracket 95 and the front body frame 1 are connected to each other via a rear cushion 8. Accordingly, the front vehicle body can swing left and right with respect to the rear vehicle body, and the rear vehicle body can swing up and down while the rear cushion 8 is extended and contracted with respect to the vehicle body.

  However, in the above-described conventional three-wheeled vehicle, when turning to the right or left, although the left and right rear wheels are in contact with the road surface, it is stable, but the left and right rear wheels remain vertical to the road surface. There was a drawback that turning is difficult.

Japanese Patent No. 3231067

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a three-wheeled vehicle that can be easily turned.

In invention of Claim 1,
A left swing arm for a left wheel supported by a rear left end of a body frame of a three-wheeled vehicle of one front wheel and two rear wheels via a swing support shaft so as to be swingable up and down;
A right swing arm for a right wheel supported on the rear right end of the vehicle body frame so as to be swingable up and down via a swing support shaft;
A left rear wheel rotatably mounted at the rear end of the left swing arm;
A right rear wheel rotatably mounted at the rear end of the right swing arm;
An upper arm and a lower arm supported so as to be swingable up and down via swing support shafts, respectively, above and below the center of the rear part of the body frame as viewed in the left-right direction;
An intermediate link in which upper and lower ends are respectively connected to a swing side end of the upper arm and a swing side end of the lower arm via a connecting shaft so as to be movable up and down.
A shock absorber interposed between a rear portion of the vehicle body frame and the intermediate link;
The intermediate link is pivotally supported via a pivot support shaft whose axial direction is the front-rear direction. When the left portion moves up and down from the pivot support shaft, the right portion moves down and up. A rear wheel position adjusting member;
A left control link having upper and lower ends connected to the left side and the left swing arm of the rear wheel position adjusting member via a connecting shaft;
A right control link having upper and lower ends connected to the right side and the right swing arm of the rear wheel position adjusting member via a connecting shaft;
It is characterized by having.
In invention of Claim 2,
The left rear wheel and the right rear wheel are driven by any one of in-wheel motor drive, belt drive drive, chain drive drive, and drive shaft drive.
It is characterized by.

  According to the present invention, when turning to the right or left, it is possible to make a small turn while ensuring the stability of the three-wheeled vehicle.

FIG. 1 is an external perspective view of a tricycle according to the present invention (Example 1). It is a side view of a motor tricycle. It is a top view of a motor tricycle. It is a rear view of a motor tricycle. It is the perspective view which abbreviate | omitted one part which shows the structure of the principal part of a tricycle. It is the top view which abbreviate | omitted partially which shows the structure of the principal part of a tricycle. It is the side view which abbreviate | omitted partially which shows the structure of the principal part of a tricycle. It is explanatory drawing which shows the function of a 2nd link structure. It is explanatory drawing which shows the effect | action of the 2nd link structure at the time of a tricycle turning right. It is explanatory drawing which shows the effect | action of the 2nd link structure at the time of a tricycle turning to the left. It is an external appearance perspective view which shows the modification of a motor tricycle. FIG. 10 is an external perspective view showing another modification of the motor tricycle.

  Hereinafter, the best mode of the present invention will be described based on examples.

FIG. 1 is an external perspective view of a motor tricycle according to the present invention, FIG. 2 is a side view of the motor tricycle shown in FIG. 1, FIG. 3 is a plan view of the motor tricycle shown in FIG. FIG. 5 is a partially omitted perspective view showing the main part of the motor tricycle of FIG. 1, FIG. 6 is a partially omitted plan view showing the configuration of the main part of the motor tricycle of FIG. 1, and FIG. It is the side view which abbreviate | omitted the part which shows the constitution of the principal part of the motorcycle.
In these drawings, reference numeral 1 denotes an automatic tricycle as an example of a three-wheeled vehicle having one front wheel and two rear wheels. Here, the two left and right rear wheels are in-wheel motor drive types. Reference numeral 2 denotes a body frame of the tricycle 1. The body frame 2 is installed between a left frame 3 and a right frame 4 arranged between the left side and the right side, and between the left frame 3 and the right frame 4. A plurality of horizontal frames 5, 6, 7 and the like. The horizontal frames 5, 6, and 7 are erected from the bottom to the top between the left frame 3 and the right frame 4 at the rear of the vehicle body frame 2. 10 is a handle rotatably mounted on the front end of the vehicle body frame 2, 11 is a front fork coupled to a steering shaft (not shown) rotatably supported on the front end of the vehicle body frame 2, and 12 is a front fork 11. This is a front wheel that can be freely rotated. Reference numeral 13 denotes a seat mounted on the vehicle body frame 2, and reference numeral 14 denotes an electrical box including a battery, a motor control device, and the like. The handle 10 is attached to the upper end of the steering shaft.

  Reference numeral 20 denotes a left swing arm for the left rear wheel. The left swing arm 20 extends linearly rearward from the left end portion of the rear lower portion of the vehicle body frame 2. A pair of brackets 21 are fixed to the rear lower portion of the left frame 3 and the left end portion of the horizontal frame 5. A front end portion of the left swing arm 20 is supported by a swing support shaft (pivot shaft) 22 provided in the bracket 21 so as to be swingable up and down. The rear end portion of the left swing arm 20 is equipped with an in-wheel motor 23 and a left rear wheel 24 that is rotatable and rotationally driven by the in-wheel motor 23. Reference numeral 30 denotes a right swing arm for the right rear wheel. The right swing arm 30 is linearly extended rearward from the right end portion of the rear lower portion of the vehicle body frame 2. A pair of brackets 31 are fixed to the rear lower portion of the right frame 4 and the right end portion of the horizontal frame 5. A front end portion of the right swing arm 30 is supported by a swing support shaft (pivot shaft) 32 provided in the bracket 31 so as to be swingable up and down. The rear end portion of the right swing arm 30 is equipped with an in-wheel motor 33 and a left rear wheel 34 that is rotatable and rotationally driven by the in-wheel motor 33.

  A rear suspension 40 is provided at the center of the rear part of the body frame 2 in the left-right direction, and absorbs an impact transmitted from the left rear wheel 24 and the right rear wheel 34 to the body frame 2. Of the rear suspension 40, 41 and 42 are an upper arm (A-type upper arm) and a lower arm that extend from the upper and lower sides of the rear portion of the body frame 2, and 43 is an intermediate link that is connected to the rear ends of the upper arm 41 and the lower arm 42. , 44 is a shock absorber (here, a damper with a spring) interposed between the rear portion of the vehicle body frame 2 and the intermediate link 43, and 45 is a rear wheel position adjusting member pivotally supported by the intermediate link 43. , 46 is a left control rod serving as a left control link having both ends connected to the left end of the rear wheel position adjusting member 45 and the left swing arm 20, and 47 is connected to the right end of the rear wheel position adjusting member 45 and the right swing arm 30. It is a right control rod as a right control link in which both ends are connected.

  The upper arm 41 has a structure in which a left branch arm 41a and a right branch arm 41b that extend obliquely rearward symmetrically are integrated on the rear end side. A pair of brackets 50 and 51 are fixed to a lateral frame 7 installed at the rear part of the vehicle body frame 2 symmetrically as viewed from the center. The front end of the left branch arm 41a is supported by a pair of brackets 50 via a swing support shaft 52 so as to be swingable up and down. The front end portion of the right branch arm 41b is supported by a pair of brackets 51 via a swing support shaft 53 so as to be swingable up and down. A pair of brackets 54 are fixed to the center of the horizontal frame 6 installed at the rear portion of the vehicle body frame 2. A front end portion of the lower arm 42 is supported by a pair of brackets 54 via a swing support shaft 55 so as to be swingable up and down. The lower arm 42 extends rearward along the center line in the left-right direction of the body frame 2 when viewed in plan. The intermediate link 43 is extended up and down in a substantially square bar shape, and a swing side end portion, which is a rear end portion of the upper arm 41, is connected to an upper end portion of the intermediate link 43 by a rotation support shaft 56. The swing side end portion, which is the rear end portion of the lower arm 42, is connected to the U-shaped support portion at the lower end portion of the intermediate link 43 by a rotation support shaft 57.

  The upper arm 41, the intermediate link 43, and the lower arm 42 constitute a first link mechanism 58. In the first link mechanism 58, the intermediate link 43 moves up and down using the swing support shafts 52, 53 and 55 as fixed fulcrums and the rotation support shafts 56 and 57 as movable fulcrums. The intermediate link 43 moves up and down at the center in the left-right direction of the three-wheeled vehicle 1 when viewed in plan. Further, when viewed from the side, the intermediate link 43 moves up and down almost in the middle of the longitudinal direction of the left swing arm 20 and the right swing arm 30. Note that the intermediate link 43 may be moved up and down from the middle in the longitudinal direction of the left swing arm 20 and the right swing arm 30 as viewed from the side.

  A U-shaped bracket 59 is fixed to the center of the horizontal frame 7 in the left-right direction. The upper end portion of the shock absorber 44 is supported by a bracket 59 via a support shaft 60. The lower end portion of the shock absorber 44 is the lower end portion of the intermediate link 43, and is supported by the support shaft 61 immediately above the rotation support shaft 56. A compression force is applied to the shock absorber 44 when the intermediate link 43 moves up, and an extension force is applied when the intermediate link 43 moves down. The shock absorber 44 absorbs an impact when the intermediate link 43 moves up and down.

  The rear wheel position adjusting member 45 is formed of a thick plate member having an isosceles triangle shape extending in the left-right direction. The rear wheel position adjusting member 45 is supported by the intermediate link 43 through the rotation support shaft 62 at the center in the left-right direction. The rotation support shaft 62 has an axial direction in the front-rear direction. The rotation support shaft 62 is disposed at the upper end of the intermediate link 43 and immediately below the rotation support shaft 56. The left control rod 46 has an upper end portion and a lower end portion connected to the left end portion on the rear side of the rear wheel position adjusting member 45 by the pinball joints 63 and 64 as connecting shafts, and the right side surface near the center as viewed in the front-rear direction of the left swing arm 20. It is connected to. The right control rod 47 has an upper end portion and a lower end portion on the right side portion on the rear side of the rear wheel position adjusting member 45 by the pinball joints 65 and 66 as connecting shafts, and the left side surface near the center as viewed in the front-rear direction of the right swing arm 30. It is connected to.

The left swing arm 20, the left control rod 46, the rear wheel position adjusting member 45, the right control rod 47, and the right swing arm 30 form a second link mechanism 67. The second link mechanism 67 uses the swing support shafts 22 and 32 as fixed fulcrums, the rotation support shaft 62 as a semi-fixed fulcrum, and the pinball joints 63 to 66 as movable fulcrums. Rocks.
When the rear wheel position adjusting member 45 rotates clockwise from the horizontal position when viewed from the back, the right control rod 47 pulls up the right swing arm 30 and the left control rod 46 pushes down the left swing arm 20 (FIG. 8 (1)). reference). On the other hand, when the wheel position adjusting member 45 is rotated counterclockwise from the horizontal posture as viewed from the back, the right control rod 47 pushes down the right swing arm 30 and the left control rod 46 pulls up the left swing arm 20 (FIG. 8 ( 2)).

  A motor control device (not shown) of the electrical box 14 controls the in-wheel motors 23 and 33 according to the driver's accelerator operation, brake operation, and handle operation, and rotates the left rear wheel 24 and the right rear wheel 34. To stop. The rear ends of the left swing arm 20 and the right swing arm 30 are equipped with a brake mechanism (not shown) that brakes the left rear wheel 24 and the right rear wheel 34 in accordance with the driver's brake operation.

Next, the operation of the above embodiment will be described.
While the tricycle 1 is traveling on a horizontal and flat road surface, the body frame 2 stands upright with respect to the road surface, and the horizontal frames 5, 6, and 7 are horizontal. When the rear wheel position adjusting member 45 is rotated clockwise from the horizontal posture as viewed from the back for some reason, the right control rod 47 pushes down the right wheel 34. Then, the load that the right wheel 34 pushes the road surface increases, the reaction force that the right wheel 34 receives from the road surface increases, and the right control rod 47 is pushed up. As a result, the rear wheel position adjusting member 45 returns to the horizontal posture. On the other hand, when the rear wheel position adjusting member 45 is rotated counterclockwise from the horizontal posture when viewed from the back for some reason, the left control rod 47 pushes down the left wheel 24. Then, the load that the left wheel 24 pushes the road surface increases, the reaction force that the left wheel 24 receives from the road surface increases, and the left control rod 46 is pushed up. As a result, the rear wheel position adjusting member 45 returns to the horizontal posture. In this manner, the rear wheel position adjusting member 45 is in a substantially horizontal orientation while traveling on a horizontal and flat road surface.

  When the left wheel 24 and the right wheel 34 get over the same step during driving and the left wheel 24 and the right wheel 34 receive a large reaction force from the road surface, the left control rod 46 and the right control rod 47 move the rear wheel position adjusting member 45. Push upward with great force. This upward force is transmitted from the pivot shaft 62 to the intermediate link 43 to move the intermediate link 43 upward. The shock absorber 44 connected between the intermediate link 43 and the lateral frame 7 acts to the vehicle body frame 2. The shock is reduced and transmitted.

  Unlike this, as shown in FIG. 9, since the vehicle turns right from the straight traveling state, when the driver cuts the handle 10 to the right and tilts the weight to the right, the body frame 2 tilts to the right from the standing state, and the horizontal frame 5 , 6 and 7 are tilted to the right. The left wheel 24 and the right wheel 34 are tilted integrally with the tilt of the body frame 2. The right wheel 34 on the curving side is kept in contact with the road surface 70. At this time, the rear wheel position adjusting member 45 is inclined integrally with the inclination of the vehicle body frame 2, and the left wheel 24 tends to float from the road surface 70. The load by which the right wheel 34 pushes the road surface 70 increases, the reaction force that the right wheel 34 receives from the road surface 70 increases, and the right control rod 47 is pushed up. As a result, the rear wheel position adjusting member 45 is rotated upward by rotating the right end of the rear wheel position adjusting member 45 counterclockwise as viewed from the rear, and is moved downward by rotating the left end of the rear wheel position adjusting member 45 counterclockwise. As a result, the left control rod 46 pushes the left swing arm 20 downward. Therefore, the left wheel 24 can maintain the ground contact state with the road surface 70, and the stability of the motorcycle 3 can be ensured. Further, since the left wheel 24 and the right wheel 34 are inclined to the right, a small turn is possible.

  On the other hand, as shown in FIG. 10, since the vehicle turns left from the straight traveling state, when the driver cuts the handle 10 to the left and tilts the weight to the left, the body frame 2 tilts to the left from the standing state, and the horizontal frame 5. 6 and 7 tilt to the left. The left wheel 24 and the right wheel 34 are tilted integrally with the tilt of the body frame 2. The left wheel 24 on the curving side is kept in contact with the road surface 70. At this time, the rear wheel position adjusting member 45 is inclined integrally with the inclination of the vehicle body frame 2, and the right wheel 34 tries to float from the road surface 70. The load by which the left wheel 24 pushes the road surface 70 increases, and the reaction force received by the left wheel 24 from the road surface 70 increases, pushing up the left control rod 46. Then, the rear wheel position adjusting member 45 is moved upward by rotating the left end portion clockwise when viewed from the back, and is moved downward by rotating the right end portion of the rear wheel position adjusting member 45 clockwise. As a result, the right control rod 47 pushes the right swing arm 30 downward. Therefore, the right wheel 34 can maintain the ground contact state with the road surface 70, and the stability of the motorcycle 3 can be ensured. Since the left wheel 24 and the right wheel 34 are inclined to the left, a small turn is possible.

  According to this embodiment, when turning to the right (or left), the left wheel 24 and the right wheel 34 are inclined with the inclination of the body frame 2. The right wheel 34 (or the left wheel 24) on the curving side is kept in contact with the road surface 70. At this time, the rear wheel position adjusting member 45 is inclined integrally with the inclination of the vehicle body frame 2, and the right wheel 34 (or the left wheel 24) tends to float from the road surface 70. The load by which the right wheel 34 (or the left wheel 24) pushes the road surface 70 increases, the reaction force that the right wheel 34 (or the left wheel 24) receives from the road surface 70 increases, and the right control rod 47 (or the left control rod 46). Push up. As a result, the right end (or left end) of the rear wheel position adjusting member 45 moves up, the left end (or right end) moves down, and the left control rod 46 (or right control rod 47) moves to the left swing arm 20. (Or right swing arm 30) is pushed downward. Therefore, the left wheel 24 (or the right wheel 34) can maintain the ground contact state with the road surface 70, and the stability of the motor tricycle 1 can be ensured. Further, since the left wheel 24 and the right wheel 34 are inclined to the right (left), a small turn is possible.

In the above-described embodiment, the rear wheel position adjusting member has a substantially isosceles triangular shape, but may have a horizontally long rectangular shape extending left and right around the rotation support shaft or a horizontally long elliptical shape. .
Further, in the above-described embodiment, the case where the left rear wheel and the right rear wheel are driven by the in-wheel motor has been described as an example. However, as shown in FIG. The left rear wheel 24 and the right rear wheel 34 are equipped with a power unit 80 including a differential gear, and left and right rotational driving forces generated by the power unit 80 are transmitted by belt drive type or chain drive type power transmission mechanisms 81 and 82. It is also possible to transmit the rotation to drive. In the case of the belt drive type, a belt type continuously variable transmission may be provided on the output side of the power transmission mechanisms 81 and 82. The power unit 80 can be replaced with a motor type.
Alternatively, as shown in FIG. 12, a power unit 90 including an engine and a transmission is mounted on the body frame 2 under the seat 13, and the rotational force generated by the power unit 90 is transmitted by the propeller shaft 91 to the rear left wheel 24 and the right wheel 34. The differential gear unit 92 installed in the middle of the motor is driven. A universal joint such as a constant velocity joint is connected between the input shaft of the propeller shaft 91 and the differential gear portion 92. The left and right drive shafts 93 and 94 are connected to the left and right output shafts of the differential gear portion 92 through universal joints such as constant velocity joints, respectively, and the output sides of the left and right drive shafts 93 and 94 are respectively connected to the right and left output shafts. You may make it connect with the rotating shaft of the left rear wheel 24 and the right rear wheel 34 via universal joints, such as a constant velocity joint. The power unit 90 can be replaced with a motor type.

  The present invention is applicable to various three-wheeled vehicles such as an in-wheel motor drive type, a belt drive type, a chain drive type, and a drive shaft drive type having two rear wheels.

DESCRIPTION OF SYMBOLS 1 Auto tricycle 2 Body frame 20 Left swing arm 24 Left rear wheel 30 Right swing arm 34 Left rear wheel 40 Rear suspension 41 Upper arm 42 Lower arm 43 Intermediate link 44 Shock absorber 45 Rear wheel position adjustment member 46 Left control rod 47 Right control rod

Claims (2)

A left swing arm for a left wheel supported by a rear left end of a body frame of a three-wheeled vehicle of one front wheel and two rear wheels via a swing support shaft so as to be swingable up and down;
A right swing arm for a right wheel supported on the rear right end of the vehicle body frame so as to be swingable up and down via a swing support shaft;
A left rear wheel rotatably mounted at the rear end of the left swing arm;
A right rear wheel rotatably mounted at the rear end of the right swing arm;
An upper arm and a lower arm supported so as to be swingable up and down via swing support shafts, respectively, above and below the center of the rear part of the body frame as viewed in the left-right direction;
An intermediate link in which upper and lower ends are respectively connected to a swinging side end of the upper arm and a swinging side end of the lower arm via a connecting shaft so as to be movable up and down.
A shock absorber interposed between a rear portion of the vehicle body frame and the intermediate link;
The intermediate link is pivotally supported via a pivot support shaft whose axial direction is the front-rear direction. When the left portion moves up and down from the pivot support shaft, the right portion moves down and up. A rear wheel position adjusting member;
A left control link having upper and lower ends connected to the left side and the left swing arm of the rear wheel position adjusting member via a connecting shaft;
A right control link having upper and lower ends connected to the right side and the right swing arm of the rear wheel position adjusting member via a connecting shaft;
A three-wheeled vehicle characterized by comprising: The left rear wheel and the right rear wheel are driven by any one of in-wheel motor drive, belt drive drive, chain drive drive, and drive shaft drive.
The three-wheeled vehicle according to claim 1.

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