CN210235196U

CN210235196U - Inverted tricycle

Info

Publication number: CN210235196U
Application number: CN201921279843.4U
Authority: CN
Inventors: Hao Yan; 严豪
Original assignee: Keihin R&D China Co Ltd
Current assignee: Hitachi Astemo Automotive Systems China Ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-04-03
Anticipated expiration: 2029-08-08

Abstract

The utility model provides an inversion formula tricycle, inversion formula tricycle includes: a vehicle body; front wheels, two of which are rotatably connected to a front portion of the vehicle body, a rotation axis of the front wheels extending in a left-right direction; the steering mechanism comprises a grab handle, a steering pull rod and a wheel fork, wherein the wheel fork can be rotatably connected to a vehicle body, the rotating axis of the wheel fork extends along the vertical direction, the steering pull rod extends along the front-back direction, and a rear wheel can be rotatably connected to the wheel fork, the rotating axis of the rear wheel extends along the left-right direction, one end of the steering pull rod is connected with the grab handle, the other end of the steering pull rod can be pivotally connected with the rotating shaft of the wheel fork or the rear wheel around multiple directions, and the rear wheel can be driven to swing in the left-right direction through operating the grab handle through the steering pull rod to realize the steering of the inverted tricycle. By adopting the technical scheme, the steering pull rod is used for driving the rear wheels to swing left and right to realize the steering of the inverted tricycle, and the sliding friction between the tires and the ground in the steering process is avoided.

Description

Inverted tricycle

Technical Field

The utility model relates to a vehicle field, in particular to inversion formula tricycle.

Background

In the prior art, an inverted tricycle includes two front wheels and one rear wheel, and the two front wheels are used as steering wheels and the rear wheel is used as a driving wheel driven by a motor.

As shown in fig. 1, the steering structure of the steered wheel is designed with reference to a steering system of an automobile. The steering structure of the steerable wheels includes a rocker arm 10 connected to two steerable wheels, a tie rod 20, and a vehicle body 30 to form a quadrangular structure, which is called an ackermann steering mechanism. By utilizing the structure, when the steering wheel rotates by a certain angle, the steering wheels on two sides can deflect by different angles, and when the intersection point of the extension lines of the axes of the two steering wheels is superposed with the extension line of the axis of the rear wheel, the three wheels can do pure rolling motion to realize vehicle turning. The ackerman steering mechanism is an ideal physical model, and in actual work, the intersection point of the axes of two steering wheels can not be always coincided with the axis of a rear wheel, and only within a certain swing angle range, the distance between the intersection point of the axes of the steering wheels and the axis of the rear wheel is changed in an interval as small as possible, so that the sliding friction between a tire and the ground can not be avoided.

SUMMERY OF THE UTILITY MODEL

Based on the problem of above-mentioned prior art, the utility model aims at providing an inversion formula tricycle, this tricycle can avoid the sliding friction between wheel and the ground to bigger degree when turning to.

The utility model provides an inversion formula tricycle, inversion formula tricycle includes:

a vehicle body;

front wheels, two of which are rotatably connected to a front portion of the vehicle body, a rotation axis of the front wheels extending in a left-right direction;

steering mechanism, steering mechanism includes grab handle, steering linkage, fork, the fork can connect with rotating in the automobile body, the axis of rotation of fork extends along upper and lower direction, steering linkage extends along fore-and-aft direction to and

a rear wheel rotatably connected to the wheel fork, a rotation axis of the rear wheel extending in a left-right direction,

one end of the steering pull rod is connected with the grab handle, the other end of the steering pull rod can be pivotally connected with the wheel fork or the rotating shaft of the rear wheel in multiple directions, and the steering of the inverted tricycle is realized by operating the grab handle through the steering pull rod to drive the rear wheel to swing in the left-right direction.

Preferably, the grab handle is hinged to the vehicle body, one end of the steering pull rod can be pivotally connected with the grab handle in multiple directions, and the grab handle can drive the steering pull rod to move in the front-back direction relative to the vehicle body in a swinging mode.

Preferably, the steering link is connected to the grip via a joint bearing.

Preferably, the rotation axis of the fork is offset in the front-rear direction from the rotation axis of the rear wheel.

Preferably, the fork extends more backward than it extends downward, the rear wheel is mounted on a lower portion of the fork, a rotation axis of the rear wheel is located rearward of the rotation axis of the fork, and a contact point of the rear wheel with the ground is located rearward of an intersection point of the rotation axis of the fork and the ground.

Preferably, the tie rod extends further forward and further outward in the left-right direction.

Preferably, the steering rod is connected with a rotating shaft of the rear wheel through a joint bearing.

Preferably, both sides in the left and right directions of the vehicle body are provided with the grab handles, and the left and right sides of the wheel fork are connected with the steering pull rod, so that the inverted tricycle can be steered by double-hand operation.

Preferably, a seat for a driver to sit is provided between the front wheel and the rear wheel, and the two grips are located on left and right sides of the seat.

Preferably, two sets of brake mechanisms are installed to the wheel fork, and brake mechanism includes brake grab handle and brake subassembly, two the brake grab handle is connected respectively in two the grab handle, the brake grab handle is connected the brake subassembly.

By adopting the technical scheme, the steering pull rod is used for driving the rear wheels to swing left and right to realize the steering of the inverted tricycle, and the sliding friction between the tires and the ground in the steering process is avoided.

Drawings

Fig. 1 shows a schematic view of an "ackerman steering mechanism" of a steering system in the prior art.

Fig. 2 shows a schematic structural diagram of an inverted tricycle according to an embodiment of the present invention.

Fig. 3 shows a cross-sectional view of an inverted tricycle according to an embodiment of the present invention.

Fig. 4 shows a schematic view of a steering mechanism of an inverted tricycle according to an embodiment of the present invention.

Fig. 5 is a schematic view of another angle of the steering mechanism of the inverted tricycle according to the embodiment of the present invention.

Fig. 6 shows a partial enlarged view of the rear wheel portion of an inverted tricycle according to an embodiment of the present invention.

Fig. 7 shows a schematic view of the steering principle of an inverted tricycle according to an embodiment of the present invention.

Description of the reference numerals

10 rocker arm 20 track rod 30 body

1 vehicle body

2 front wheel

3 rear wheel

Wheel mounting part 442 of wheel fork 441 rotating shaft part of steering rod 44 of 4-steering mechanism 41 grab handle 42 knuckle bearing 43

5 brake mechanism 51 brake handle 52 brake assembly

X front-back direction Y left-right direction Z up-down direction.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

Unless otherwise specified, the front-rear direction X is the front-rear direction of the inverted tricycle, the left-right direction Y is the left-right direction of the inverted tricycle, and the up-down direction Z is the up-down direction of the inverted tricycle.

As shown in fig. 2 to 7, the present invention provides an inverted tricycle, which includes a tricycle body 1, front wheels 2, rear wheels 3 and a steering mechanism 4, wherein the two front wheels 2 are rotatably connected to the front portion of the tricycle body 1, and the rear wheel 3 is connected to the rear portion of the tricycle body 1 through the steering mechanism 4. The rear wheel 3 is positioned at the middle position of the two front wheels 2 in the left-right direction Y, and the direction of the rear wheel 3 is changed by swinging the rear wheel 3 in the left-right direction Y, so that the inverted tricycle is steered.

As shown in fig. 3 to 5, the steering mechanism 4 includes a grip 41, a knuckle bearing 42, a steering link 43, and a wheel fork 44.

The wheel fork 44 has a rotation shaft portion 441 and a wheel mounting portion 442 connected to the rotation shaft portion 441, the rotation shaft portion 441 extends in the vertical direction Z, and the rotation shaft portion 441 is rotatably connected to the vehicle body 1 so that the wheel fork 44 can rotate about the axis of the rotation shaft portion 441. The wheel mount 442 may be two tubes connected below the rotating shaft portion 441, the two tubes being located on both sides of the rear wheel 3, and the rear wheel 3 being rotatably connected to the wheel mount 442 by the rotating shaft. The fork 44 used in this application is similar in construction to a conventional front fork of a bicycle and is used to mount a steerable wheel, but the steerable wheel on the bicycle is the front wheel, while the steerable wheel mounted to the fork 44 in this application is the rear wheel 3.

The two grips 41 are hinged to both sides of the vehicle body 1 in the left-right direction Y, the grips 41 may be rod-shaped, one end of the grip 41 is used for holding by hand, and the other end of the grip 41 may be connected to a steering link 43 through a knuckle bearing 42. One end of the handle 41 can swing to operate the handle 41, and further, the steering rod 43 is driven to move in the front-back direction X. The position of the articulation of the grip 41 to the body 1 may be located between the two ends of the grip, the two ends of the grip 41 moving in opposite directions when the grip 41 is rotated, for example one end moving forward and the other end moving backward.

The steering link 43 extends in the front-rear direction X, one end of the steering link 43 is pivotably connected to the grip 41 via a joint bearing 42, and the other end of the steering link 43 is pivotably connected to a rotating shaft or wheel mount 442 of the rear wheel 3 via a joint bearing 42, and the joint bearing 42 can pivotally connect the wheel fork 44 to the steering link 43 in multiple directions. Preferably, the other end of the steering linkage 43 is connected to the axle of the rear wheel 3, so that the rear wheel can be directly deflected by the steering linkage 43. The seat is positioned between the front wheel 2 and the rear wheel 3, and the grips 41 are positioned on both sides of the seat in the left-right direction Y, so that the driver can operate the grips 41 to rotate the fork 44 about the axis of the rotation shaft portion 441 by operating the steering rod 43. The tie rod 43 extends outward in the lateral direction as it extends forward, and for example, the tie rod 43 on the left extends leftward as it extends forward, so that the rear wheel 3 does not easily contact the tie rod 43 when the rear wheel 3 is deflected, and the rotation of the rear wheel 3 is affected.

When the two grips 41 located on the left and right sides of the seat are operated, the operation directions are opposite, for example, the left grip 41 is pushed forward, and the right grip 41 is pulled backward, so that the fork 44 is rotated to the left, and the inverted tricycle is turned to the right. The left grip 41 is pulled backwards, and the fork 44 is rotated rightwards by pushing the right grip 41 forwards, so that the inverted tricycle turns leftwards, which is in accordance with the operation habit of people.

It will be appreciated that when the inverted tricycle is driven in a straight line, the axis of rotation of the front wheel 2 and the axis of rotation of the rear wheel 3 are parallel. As shown in fig. 7, when a driver needs to turn, the front wheels 2 do not deflect, and the driver operates the steering mechanism 4 to turn the rear wheels 3 at an angle to the left or right, so that the rotating shaft of the rear wheels 3 deflects. Since there must be an intersection between two non-parallel straight lines in the same plane, there must be an intersection between the axis of rotation of the front wheel 2 and the axis of rotation of the rear wheel 3. The rotation axis of the front wheel 2 is fixed and the rotation axis of the rear wheel 3 can be deflected, so that the intersection of the rotation axis of the front wheel 2 and the rotation axis of the rear wheel 3 necessarily falls on the extension of the rotation axis of the front wheel 2. When the rear wheel 3 rotates at any angle, the rotating axis of the rear wheel 3 and the rotating axis of the front wheel 2 both have an intersection point on the extension line of the rotating axis of the front wheel 2, at the moment, the vehicle body 1 rotates around the intersection point of the two rotating axes in a circumferential manner, the path traveled by the three wheels is an arc of a concentric circle with three different radiuses, and the three wheels all do pure rolling motion, so that the sliding friction between the wheels and the ground is avoided.

Further, the wheel mount 442 is curved and extends, the rear wheel 3 is mounted to the lower end of the wheel mount 442, and the wheel mount 442 extends rearward as it extends downward, so that the rotation axis of the rotation shaft portion 441 and the rotation axis of the rear wheel 3 are offset in the front-rear direction X, for example, the rotation axis of the rear wheel 3 is located rearward of the rotation axis of the rotation shaft portion 441. The curved extension of the wheel mounting portions 442 makes it possible to make the vehicle compact and to make the vehicle small in dimension in the front-rear direction X, while ensuring a constant front-rear wheel base.

Specifically, the intersection point of the rotation axis of the rotation shaft portion 441 of the fork 44 and the ground is a, the contact point of the rear wheel 3 and the ground is B, and the contact point of the rear wheel 3 and the ground is located directly below the rotation axis of the rear wheel 3. The points a and B are offset in the front-rear direction X and the point a is located forward of the point B. As fork 44 rotates, the ground applies a frictional force to rear wheel 3 that resists rotation of fork 44, in a direction opposite to the direction of rotation of fork 44. On the other hand, the friction force forms a moment with the rotating axis of the fork 44 to prevent the fork 44 from rotating, so that the rear wheel 3 is easy to keep running straight, the driver is prevented from holding the grab handle all the time to prevent the rear wheel 3 from deflecting, and the operation burden of the driver is reduced.

The wheel fork 44 can be connected with the brake mechanism 5, the brake mechanism 5 comprises a brake handle 51 and a brake component 52, the brake component 52 can be connected with the wheel fork 44, the brake component 525 is connected with the brake handle 51 through a brake cable, and the brake handle 51 is connected with the handle 41. The brake mechanism 5 is provided with two groups, the left brake grip 51 controls one group, the right brake grip 51 controls the other group, and both the left hand and the right hand can hold the brake grip 51 for braking. If one group of brake mechanisms 5 fails, the other group of brake mechanisms 5 can be normally used, and the stability of braking is improved. It will be appreciated that the two sets of brake mechanisms 5 can be completely independent, i.e., one brake lever 51 controls one brake assembly 52, or two brake levers 51 can be connected to a single brake assembly 52, each brake lever 51 being operable to brake the brake assembly 52.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

1. An inverted tricycle, comprising:

a vehicle body (1);

front wheels (2), wherein the two front wheels (2) are rotatably connected to the front part of the vehicle body (1), and the rotating axis of the front wheels (2) extends along the left-right direction (Y);

a steering mechanism (4), the steering mechanism (4) comprises a handle (41), a steering pull rod (43), a wheel fork (44), the wheel fork (44) can be rotatably connected to the vehicle body (1), the rotation axis of the wheel fork (44) extends along the up-down direction, the steering pull rod (43) extends along the front-back direction (X), and

a rear wheel (3), the rear wheel (3) being rotatably connected to the fork (44), a rotation axis of the rear wheel (3) extending in a left-right direction,

one end of the steering pull rod (43) is connected with the grab handle (41), the other end of the steering pull rod (43) is pivotally connected with the wheel fork (44) or a rotating shaft of the rear wheel (3) in multiple directions, and the rear wheel (3) can be driven to swing in the left-right direction (Y) through the steering pull rod (43) by operating the grab handle (41) so as to realize the inverted tricycle steering.

2. The inverted tricycle according to claim 1, wherein the handle (41) is hinged to the body (1), one end of the steering rod (43) is pivotally connected to the handle (41) about multiple directions, and the handle (41) is swingable relative to the body (1) to move the steering rod (43) in the fore-and-aft direction.

3. Inverted tricycle according to claim 2, characterised in that the steering rod (43) is connected with the handgrip (41) by means of a knuckle bearing.

4. Inverted tricycle according to claim 1, characterised in that the axis of rotation of the fork (44) is offset in the front-rear direction (X) from the axis of rotation of the rear wheel (3).

5. The inverted tricycle according to claim 1, wherein the fork (44) extends more backward than it extends downward, the rear wheel (3) is mounted at a lower portion of the fork (44), a rotation axis of the rear wheel (3) is located rearward of the rotation axis of the fork (44), and a contact point of the rear wheel (3) with the ground is located rearward of an intersection point of the rotation axis of the fork (44) with the ground.

6. The inverted tricycle according to claim 1, wherein the tie rod (43) extends further to the front than to the outside in the left-right direction.

7. Inverted tricycle according to claim 1, characterised in that the steering rod (43) is connected with the axle of the rear wheel (3) by means of a knuckle bearing.

8. The inverted tricycle according to claim 1, wherein the grip handle (41) is provided on both sides of the body (1) in the left-right direction (Y), and the steering rod (43) is connected to both the left and right sides of the fork (44), so that the inverted tricycle can be steered by both hands.

9. Inverted tricycle according to claim 8, characterised in that between the front wheel (2) and the rear wheel (3) there is a seat for the driver to sit on, and two grips (41) are located on the left and right sides of the seat.

10. The inverted tricycle according to claim 8, wherein the fork (44) is fitted with two sets of brake mechanisms (5), the brake mechanisms (5) comprising a brake lever (51) and a brake assembly (52), the two brake levers (51) being connected to the two levers (41), respectively, the brake lever (51) being connected to the brake assembly (52).