JP3012158B2 - Vehicle having steering wheel for two-way driving - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle having a front-facing driving handle and a rear-facing driving handle, and is suitable for a cargo-handling vehicle such as a forklift or the like, which can block a forward view, and an underground transportation vehicle that cannot make a U-turn. It is.

[0002]

2. Description of the Related Art Conventionally, a vehicle having a forward driving handle and a rearward driving handle so as to be able to drive in either front or rear direction has been used (for example, see Japanese Utility Model Laid-Open No. 57-79081). ).

FIG. 5 shows a conventional control device for controlling a steering force generating hydraulic actuator 107 in accordance with each rotation of the first handle 100 for forward operation and the second handle 101 for backward operation. The control device is the first
First hydraulic control valve 102 connected to handle 100
And a second hydraulic control valve 103 connected to the second handle 101, and a switching valve 104 connected to both control valves 102, 103. Double control valve 10
2 and 103, the pump 10
5 and the tank 106 are connected, and the hydraulic actuator 107 is connected. The hydraulic actuator 10
7 is transmitted to the wheels 108 via a steering device 109 such as a tie rod or a knuckle arm.

The switching valve 104 switches the flow of oil so as to send pressure oil to the first hydraulic control valve 102 during forward operation and to send pressure oil to the second hydraulic control valve 103 during backward operation. The switching is performed, for example, by interlocking the switching valve 104 with the rotation of the driving seat according to the driving posture. The first hydraulic control valve 102 controls the hydraulic pressure acting on the actuator 107 so as to generate a steering force and a steering angle according to the rotation of the first handle 100, and the second hydraulic control valve 103 controls the second handle 1
The hydraulic pressure acting on the actuator 107 is controlled so as to generate a steering force and a steering angle corresponding to the rotation of No. 01. As the control valves 102 and 103, for example, an orbit roll (trademark of Eaton Corporation, USA) can be used.

[0005]

In the above-mentioned conventional configuration,
Actuator 10 according to rotation of first handle 100
7, a first hydraulic control valve 102 for controlling the actuator 7, a second hydraulic control valve 103 for controlling the actuator 107 in accordance with the rotation of the second handle 101, and a switching valve 104 are required. This has led to an increase in weight and cost.

An object of the present invention is to provide a vehicle having a front and rear two-way driving handle capable of solving the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a vehicle including a forward driving handle, a rearward driving handle, and a control device for controlling an actuator for generating a steering force in accordance with the rotation of each handle. Are connected to each other via a rotation transmission mechanism, and the rotation transmission mechanism transmits the control device by reversing the rotation of one handle and transmitting the rotation without reversing the rotation of the other handle.
The rotation transmission mechanism rotates in the same direction as one handle.
A first gear that rotates and a first gear that meshes with the first gear;
A second gear rotatable about an axis parallel to a rotation axis of the gear;
A first rotating member that rotates coaxially with the second gear;
And a second rotating member that rotates in the same direction as the other handle
And wound around both rotating members so that both rotating members rotate in the same direction.
And a second gear and a first
With the rolling member, so that the tension of the endless member can be adjusted,
The first gear is swingable about the rotation axis thereof.
Of each handle to the control device via the second rotating member of
The rotation is transmitted, and the rotation about the axis parallel to the rotation axis of both rotating members is performed.
A rollable arm is supported by the vehicle and both arms
At the end, it can rotate about the axis parallel to the rotation axis of both rotating members
A roller is attached, and both rollers rotate around the endless member.
By being placed at the position in contact with the outside of the orbit, its endless
The material is characterized in that bending of the material is prevented .

[0008]

[0009]

According to the structure of the present invention, the rotation of one handle is inverted by the rotation transmission mechanism and transmitted to the control device, and the rotation of the other handle is transmitted to the control device without inversion. Since the steering force generating actuator is controlled in accordance with the rotation of the steering wheel, the direction of the steering force generated by the actuator matches when the rotation direction of the forward driving handle and the rearward driving handle are opposite to each other. Thereby, it is possible to make the rotation direction of the forward driving handle coincide with the steering direction for the driver during forward driving, and to match the rotation direction of the rearward driving handle with the steering direction for the driver during backward driving. it can.

[0010] The rotation of one handle is controlled by the first gear and the second gear.
Reversal can be transmitted to the control device via the gear, the first rotating member, the endless member, and the second rotating member, and rotation of the other handle can be transmitted to the control device without reversing via the second rotating member. By swinging the second gear and the first rotating member about the rotation axis of the first gear, the tension of the endless member can be adjusted. At this time, since the rotation center of the first gear does not change, there is no need to move one handle, and since the rotation center of the second rotation member does not change, it is not necessary to move the other handle and the control device. Absent. Both rotations at the position in contact with the endless member outside the orbit
Two rollers rotatable about an axis parallel to the rotation axis of the member
, The bending of the endless member can be prevented.
Furthermore, both rollers are centered on the axis parallel to the rotation axis of both rotating members.
It is attached to both ends of the arm that can rotate
The arm rotates according to the movement of the member, and always keeps both rollers
Fits end members to prevent endless members from flexing
Wear.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

A forklift 1 shown in FIG.
And a cargo handling device 3 provided at a front portion of the vehicle body 2, a counterweight 4 provided at a rear portion, a front wheel 5 serving as a driving wheel, and a rear wheel 6 serving as a steering wheel. The front wheel 5
The space between the rear wheel 6 and the rear wheel 6 is a driving space covered by the head guard 7. In the driving space, the first for forward driving
A handle 8, a second handle 9 for backward driving, and a driver seat 10 that is rotatable about a vertical axis and located between the handles 8, 9 are provided. In the operating space, operating devices such as an accelerator and a brake are provided for forward driving and backward driving, respectively. The cargo handling device 3 is a so-called cargo handling device of a general forklift, and is provided at a front portion of the vehicle body 2.

As shown in FIG. 2, both handles 8, 9
Are connected via a rotation transmission mechanism 15. That is, the rotation transmission mechanism 15 includes a first gear 20 connected to the first handle 8 via a handle shaft, a universal joint, and the like, and a second gear 21 meshing with the first gear 20.
A first pulley (first rotating member) 22 connected to the second gear 21 and a second pulley (second rotating member) 23 connected to the second handle 9 via a handle shaft, a universal joint, or the like. And a timing belt (endless member) 24 wound around both pulleys 22 and 23. The first gear 20 rotates in the same direction as the first handle 8, the second gear 21 rotates about an axis parallel to the rotation axis of the first gear 20, and the first pulley 22 is connected to the second gear 21. The second pulley 23 rotates in the same direction as the second handle 9, and the two pulleys 22 and 23 rotate in the same direction about axes parallel to each other. The second pulley 23
The rotation of each handle 8, 9 is transmitted to the control device 16 via. That is, the rotation transmission mechanism 15 inverts the rotation of the first handle 8 to transmit the rotation to the control device 16 and also controls the control device 1 without inverting the rotation of the second handle 9.
To 6.

The control device 16 is constituted by a hydraulic control valve for controlling a hydraulic actuator 19 for generating a steering force in accordance with the rotation of each handle 8, 9.
3, an input shaft 16a connected rotatably with a coaxial center.
Having. A pump 17, a tank 18, and a hydraulic actuator 19 are connected to the control valve 16, and the steering force generated by the actuator 19 is transmitted to the rear wheel 6 via a steering device 40 such as a tie rod or a knuckle arm. The control valve 16 controls the hydraulic pressure applied to the actuator 19 such that a steering force and a steering angle corresponding to the rotation of each of the handles 8, 9 input from the input shaft 16a via the second pulley 23 are generated. That is, when the rotation direction of the first handle 8 and the rotation direction of the second handle 9 are opposite to each other, the rear wheels 6 are steered in the same direction. As the control valve 16, for example, an orbit roll (trademark of Eaton Corporation, USA) can be used.

The second gear 21 and the first pulley 22
In order to adjust the tension of the timing belt 24,
The first gear 20 is swingable about a rotation axis thereof. That is, as shown in FIG.
0, the second gear 21 and the first pulley 22 are supported by a gear box 27, and the gear box 27
The first gear 20 is swingably supported about a rotation shaft 20 a of the first gear 20. An adjustment screw 28 screwed to a nut 25 attached to the vehicle body 2 can be pressed onto the gear box 27. Thereby, the adjusting screw 2
8 by rotating the first pulley 22
The second gear 21 and the gear box 27 swing about the rotation shaft 20a of the first gear 20. The swing of the first pulley 22 adjusts the tension of the timing belt 24.

Further, as shown in FIGS. 3A and 3B, a mechanism 29 for preventing the timing belt 24 from bending in the vertical direction is provided. That is, both pulleys 22, 2
An arm 30 is supported by the vehicle body 2 so as to be rotatable about an axis 30a parallel to the rotation axis of the roller 3, and a roller 31 rotatable about an axis parallel to the rotation axis of both pulleys 22, 23 at both ends of the arm 30 32 is attached at a position in contact with the outside of the orbit of the timing belt 24, and flanges 31 a and 32 a supporting the timing belt 24 are attached to the rollers 31 and 3.
2 is provided.

According to the above configuration, the rotation of the first handle 8 is inverted by the rotation transmitting mechanism 15 and transmitted to the control device 16, and the rotation of the second handle 9 is transmitted to the control device 16 without inverting the rotation. Since the device 16 controls the actuator 19 according to the rotation of each handle 8, 9, the first
When the rotation direction of the handle 8 and the rotation direction of the second handle 9 are opposite to each other, the direction of the steering force generated by the actuator 19 matches. Thereby, it is possible to make the rotation direction of the first handle 8 coincide with the steering direction for the driver during forward driving, and to match the rotation direction of the second handle 9 with the steering direction for the driver during backward operation. it can. For example, when the rotation direction of the first handle 8 is clockwise and the rotation direction of the second handle 9 is counterclockwise,
The forklift 1 is steered to the right for a driver in a forward driving state, and steered to the left for a driver in a backward driving state. Thereby, the control device 16
Can be configured with a single hydraulic control valve, and the configuration can be simplified, and the weight and cost can be reduced as compared with the conventional example that requires two hydraulic control valves and a switching valve.

Further, the tension of the timing belt 24 can be adjusted by swinging the second gear 21 and the first pulley 22 around the rotation shaft 20a of the first gear 20. Since the rotation center of the gear 20 does not change,
There is no need to move the first handle 8 connected to the first gear 20 and the center of rotation of the first pulley 22 does not change, so that the second handle 9 connected to the second pulley 23 and the control device There is no need to move 16 as well. Accordingly, when the rotation transmission is performed using the wrapping transmission mechanism, the tension of the timing belt 24 can be easily adjusted with a simple structure.

The present invention is not limited to the above embodiment. For example, a sprocket may be used instead of the first and second pulleys 22 and 23, and a chain may be used instead of the timing belt 24. Also, bevel gears 41, 42, 43, 44 and drive shaft 45 as shown in FIG.
The rotation of each handle 8, 9 may be transmitted to the control device 16 by a combination of the above. Alternatively, an electric actuator may be used as the actuator, and a computer that controls the electric actuator according to the rotation direction of the handle may be used as the control device. Alternatively, the rotation of the first handle 8 may be transmitted to the control device 16 without reversing the rotation, and the rotation of the second handle 9 may be transmitted to the control device 16 by reversing the rotation. The present invention is also applicable to vehicles other than forklifts.

[0020]

According to the present invention, the structure of the control device can be simplified, the weight and cost can be reduced, and further, when the rotation is transmitted by using a wrapping transmission mechanism, the tension adjustment of the endless transmission member is performed. easily performed with a simple structure, its free
Prevent deflection of end members to increase operation response
It is Ru can.

[Brief description of the drawings]

FIG. 1 is a side view of a forklift according to an embodiment of the present invention.

FIG. 2 is a structural explanatory view of a steering mechanism of the forklift.

FIG. 3 is a plan view of a rotation transmission mechanism of the steering mechanism, and FIG.

FIG. 4 is a configuration explanatory view of a modified example.

FIG. 5 is an explanatory diagram of a configuration of a steering mechanism in a conventional vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Forklift 8 1st handle (front-facing operation handle) 9 2nd handle (rearward operation handle) 15 Rotation transmission mechanism 16 Control device 19 Actuator 20 1st gear 21 2nd gear 22 1st pulley (1st rotating member) 23 Second pulley (first rotating member) 24 Timing belt (endless member)

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 1/04-1/28

Claims (1)

(57) [Claims] 1. A vehicle comprising a forward driving handle, a rearward driving handle, and a control device for controlling a steering force generating actuator according to the rotation of each handle, the two handles being connected to each other via a rotation transmission mechanism. The rotation transmission mechanism transmits the rotation of one handle to the control device by reversing the rotation and transmits the rotation of the other handle without reversing the rotation , and the rotation transmission mechanism transmits the rotation in the same direction as the one handle. Rotate
And a first gear meshed with the first gear and
A second gear rotatable about an axis parallel to the rotation axis of the second gear;
A first rotating member that rotates coaxially with the second gear,
A second rotating member that rotates in the same direction as the handle,
Wrap around both rotating members so that the rotating members rotate in the same direction.
And the second gear and the first rotating member are in tension with the endless member.
Around the rotation axis of the first gear so that
And the handle of each handle is transmitted to the control device via the second rotating member.
An arm to which rotation is transmitted and rotatable about an axis parallel to the rotation axis of both rotating members
Are supported by the vehicle, and both ends of the arm
A roller that can rotate around the axis parallel to the rotation axis of the material is attached
At the position where both rollers are in contact with the outer end of the orbit of the endless member.
A vehicle having a front and rear two-way driving handle , wherein the endless member is prevented from bending by being disposed .