JPH0558567U - Steering device - Google Patents

Abstract

(57) [Summary] (Modified) [Object] The present invention has an object to provide a steering device that does not transmit the shocking kickback force input to the tire from the road surface to the steering wheel. A variable orifice shock absorber 15 is provided with a controller 16 which pivotally connects one end to an axle 11 and the other end to a tie rod arm 8a and controls the opening of the orifice based on a signal from a vehicle speed sensor 17.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention transmits the rotational force of the steering wheel to the tires through the steering gear box, the pitman arm, the drag link, the steering arm and the king pin, and the tie rod arms are respectively connected to the king pins of both the left and right tires. The tie rod arm relates to the steering device connected to the tie rod.

[0002]

[Prior art and problems]

 In the case of the conventional steering device, the kickback force input to the tire from the road surface is finally transmitted to the steering wheel, that is, the steering wheel via the steering arm, the drag link, the pitman arm, and the steering gear box. There is a problem that a large impact force is transmitted to the steering wheel when the input from the road surface is large.

Therefore, as shown in FIG. 6, a technique has been proposed in which a shock absorber 20 is provided between the pitman arm 4 and the frame 10 to attenuate the kickback force. However, the effect of the shock absorber 20 is increased. Thus, there is a drawback that the steering force increases when the damping force is increased.

[0004] Although there is Japanese Utility Model Laid-Open No. 62-26780 published by the present applicant, the above-mentioned problem cannot be solved by a technique relating to the fixing of a self-steering wheel.

[0005]

[Problems to be solved by the device]

 Therefore, it is an object of the present invention to provide a steering device that prevents a shocking kickback force input to a tire from a road surface from being transmitted to the steering.

[0006]

[Means for Solving the Problems]

 According to the present invention, the turning force of the steering wheel is transmitted to the tire through the steering gear box, the pitman arm, the drag link, the steering arm, and the king pin, and the tie rod arms are respectively connected to the king pins of both the left and right tires. , Those tie rod arms are connected to the tie rod, and the steering device is equipped with a variable orifice type shock absorber consisting of a cylinder piston rod, one end of which is pivotally attached to the axle and the other end is a tie rod arm. A controller, which is pivotally connected to the shock absorber, changes the variable orifice of the shock absorber according to the vehicle speed.

[0007]

[Explanation of effects]

 According to the steering device configured as described above, the kickback force input to the tire from the road surface is transmitted to the tie rod and the tie rod arm via the kingpin and is absorbed by the shock absorber at the tie rod. Not transmitted to. The tie rod, the arm, and the king pin need only be strong enough to withstand the impact force, and the other parts do not receive the impact force, so the weight can be reduced.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In explaining the embodiments, in order to facilitate understanding of the present invention, parts related to the conventional technique will be described with reference to FIGS. 2 and 3.

A steering gear box 3 is fixed to the tip of the frame 10, and the steering column 2 and the handle 1 are connected to the steering gear box 3 via a joint 13. Further, one end of a pitman arm 4 is fixed to a not-shown sector shaft inside the gear box 3, and the other end is connected to a drag link 5. The drag link 5 is connected to the steering arm 7 that pivots the tire 12a around the kingpin 6, and the left and right tires 12a and 12b provided at both ends of the axle 11 are tie rod arms 8 and 8 and a tie rod 9 respectively. They are connected so as to pivot in the same direction via and. The symbol C indicates a cab.

However, if the steering wheel 1 is rotated left and right, the drag link 5 is moved forward and backward, so that the left and right tires 12a and 12b are moved left and right through the steering arm 7, the tie rod arms 8 and 8 and the tie rod 9. Be pivoted. On the contrary, when the tires 12a and 12b are swung left and right by the input from the road surface, the handle 1 is swung right and left.

Next, an embodiment of the present invention will be described with reference to FIG.

One end (piston rod side in the illustrated example) of a variable orifice type shock absorber 15 is pivotally attached to the tie rod arm 8 a (the gear box 3 side in the illustrated example), and the other end is provided on the axle 11. It is pivotally attached to the attached bracket 18. Further, a controller 16 is fixedly mounted on a vehicle body (not shown), and the controller 16 is connected to, for example, a vehicle speed sensor 17 configured by providing a speedometer (not shown) with contacts and the shock absorber 15 by electric circuits. ..

Then, based on the signal from the vehicle speed sensor 17, the controller 16 controls the orifice of the shock absorber 15 at a high speed to increase the damping force, and at a low speed to open the orifice to weaken the damping force. It is configured.

Therefore, the kickback force input to the tire due to the unevenness of the road surface is conventionally transmitted to the steering wheel as shown in FIG. 5, but in the case of the present invention, As shown in FIG. 4, the weakened kickback force is transmitted from the steering arm 5 to the steering wheel 1. The degree of this attenuation is determined by the opening of the orifice, which changes with the speed.

Further, the mounting direction of the variable orifice type shock absorber 15 may be opposite to that of the present embodiment, and the piston rod side may be pivotally attached to the axle.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, the kickback force transmitted to the steering wheel is reduced, so that the driver is not disturbed by the disturbance caused by the road surface and safety is improved. Moreover, since the kickback force is damped by the tie rod arm, a large impact force is not applied to the steering linkage, the gearbox and the column, so that the weight of these parts can be reduced. Also, since the damping force is weakened at low speed, there is no drawback that the steering force becomes large.

[Brief description of drawings]

FIG. 1 is a plan view of a steering device showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional steering device.

FIG. 3 is a plan view of FIG.

FIG. 4 is a diagram showing an example of the effect of reducing the kickback force of the present invention.

FIG. 5 is a diagram showing an example of a conventional kickback force.

FIG. 6 is a diagram illustrating a known technique for reducing kickback force.

[Explanation of symbols]

 1 ... Steering wheel 2 ... Steering column 3 ... Steering gear box 4 ... Pitman arm 5 ... Drag link 6 ... King pin 7 ... Steering arm 8, 8a ... Tie rod arm 9・ ・ ・ Tie rod 10 ・ ・ ・ Frame 11 ・ ・ ・ Axle 12 ・ ・ ・ Tire 15 ・ ・ ・ Variable orifice type shock absorber 16 ・ ・ ・ Controller 17 ・ ・ ・ Vehicle speed sensor 18 ・ ・ ・ Bracket 20 ・ ・ ・ Shock absorber

Claims (1)

[Scope of utility model registration request] 1. A rotative force of a steering wheel is transmitted to a tire through a steering gear box, a pitman arm, a drag link, a steering arm and a king pin, and tie rod arms are connected to the king pins of both left and right tires, respectively. The tie rod arm of the above is a steering device connected to the tie rod, and provided with a variable orifice type shock absorber consisting of a cylinder piston rod, one end of which is pivotally attached to the axle and the other end is pivotally attached to the tie rod arm. A steering device comprising a controller for changing a variable orifice of the shock absorber according to a vehicle speed.