JPH0444462Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a power steering device for a two-wheel front wheel vehicle, and more specifically, it is an improvement of a coupling mechanism that interlocks and steers front and rear wheels. Regarding.

[Conventional technology]

A power steering device for a two-axle front vehicle requires a coupling mechanism that interlocks and steers the two front wheels, and the power steering device for a two-axle front vehicle equipped with this mechanism includes, for example: The one shown in Figure 2 is known or
The method shown in the specification (see Utility Model Application Publication No. 61-127077) has been proposed.

In Figure 2, steering gear box 1
A pitman arm 2 is provided on the vehicle, and is configured to swing when a steering wheel 3 is operated. A link 4 is connected to this pitman arm 2, and a booster 5 is operated by this link 4. A front idler arm 6 on the driver's seat side is connected to the booster 5 and is swingably provided on one frame 7. A front drag link 8 on the driver's seat side is connected to this front idler arm 6 on the driver's seat side. A front link mechanism 10 is provided on the front-to-front shaft 9, and is composed of a tie rod 10a and a tie rod arm 10b. The driver's seat side front drag link 8 is connected to a driver's seat side tie rod arm 10b (one end side of the front link mechanism 10) via a driver's seat side front arm 11.

A power cylinder 12 is supported by one frame 7 and operates in cooperation with the booster 5. A driver's seat side rear idler arm 13 is connected to this power cylinder 12 and is swingably provided on one frame 7. A driver's seat rear drag link 14 is connected to this driver's seat rear idler arm 13. A rear link mechanism 16 is provided on the longitudinal axis 15, and this rear link mechanism 16 is composed of a rear tie rod 16a and a rear tie rod arm 16b.
The driver's seat side rear drag link 14 is connected to a driver's seat side tie rod arm 16b (one end side of the rear link mechanism 16) via a driver's seat rear arm 17.

The driver's seat side front idler arm 6 and the driver's seat side rear idler arm 13 are connected by a driver's seat side middle link 18. Therefore, the front front wheels (not shown) and the front and rear wheels (not shown) are steered in conjunction with each other by the driver's seat side middle link 18.

[Problem that the invention attempts to solve]

However, in the case of such a conventional power steering device for a two-axle front-wheel vehicle, the front two wheels (or the front and rear wheels) lift up due to unevenness of the road surface, and the force acting on the steering link from only the front and rear wheels (or the front two wheels) increases. may be received. In such a case, the force from the booster 5 and the power cylinder 12 acts on the driver's side rear drag link 14 (or the driver's side front drag link 8), and It does not act on the rear drag link 14) on the seat side.

Therefore, in consideration of such load conditions, the front drag link 8 on the driver's seat side and the rear drag link 14 on the driver's seat side need to be strong enough to withstand the forces from the booster 5 and the power cylinder 12 at the same time. That's how much the strength had increased.

[Purpose of invention]

The present invention was devised to solve the above-mentioned problem, and its purpose is to apply force to the front drag link or rear drag link when the force acting on the steering link is applied only to the front front wheels or the front and rear wheels. It is an object of the present invention to provide a power steering device for a two-axle vehicle with front wheels capable of reducing the applied force.

[Means for solving problems]

In order to achieve the above object, the present invention connects a link to a pitman arm that is swung by a steering gear box, connects a driver's side front idler arm to a booster operated by this link, and connects a driver's side front idler arm to a booster operated by this link. The arm is swingably supported on one frame and connected to the front drag link on the driver's seat side. On the other hand, the driver's side rear idler arm is connected to a power cylinder that operates in cooperation with the booster, and this driver's side rear idler arm is swingably supported on one frame, and the driver's side rear idler arm is This rear drag link on the driver's seat side is connected to one end of a rear link mechanism provided on the front and rear axes via a rear arm.
Furthermore, in a power steering system for a front two-axle vehicle in which the front and rear wheels are steered in conjunction with each other by a middle link, the other end of the front link mechanism is connected to the side opposite to the driver's seat side. The auxiliary front drag link is connected to the auxiliary front drag link via an auxiliary front arm, and the auxiliary front drag link is connected to the auxiliary front idler arm provided on the other frame side, while the other end of the rear link mechanism is connected to the driver's seat side. The auxiliary rear drag link is connected to the auxiliary rear drag link on the opposite side via an auxiliary rear arm, and this auxiliary rear drag link is connected to the auxiliary rear idler arm provided on the other frame side, and the auxiliary front idler arm and the auxiliary rear idler The arm is connected by a middle link.

[Effect of invention]

In the case of a load condition in which the front wheels lift up and only the front and rear wheels receive force acting on the steering link, the force from the booster is transferred from the booster → driver's side front idler arm → driver's side front drag link → front arm → Front link mechanism → auxiliary front arm → auxiliary front drag link → auxiliary front idler arm → middle link → auxiliary rear idler arm → auxiliary rear drag link → auxiliary rear arm → rear link mechanism → transmitted to front and rear wheels. Therefore, the driver's side front drag link, auxiliary front drag link, and auxiliary rear drag link receive the same force from the booster.

On the other hand, the force from the power cylinder is transmitted from the power cylinder to the driver's side rear idler arm to the driver's side rear drag link to the rear arm to the rear link mechanism to the front and rear wheels. Therefore, the rear drag link on the driver's seat side receives only the force from the power cylinder.

Also, unlike the load conditions mentioned above, if the front and rear wheels lift up and only the front two wheels receive the load, the driver's side rear drag link, auxiliary rear drag link, and auxiliary front drag link are all connected from the power cylinder. On the other hand, the front drag link on the driver's side receives only the force from the booster.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power steering device for a front two-axle vehicle according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

The power steering device for a two-axle front-wheel vehicle according to this embodiment has a power steering system installed in the part where the driver's seat side middle link 18 of the conventional example shown in FIG. 2 is removed, and as shown in FIG. This is an addition of part A surrounded by a two-dot chain line. Therefore, explanation of the same parts as in the conventional example will be omitted, and only the added part A will be explained.

On the front tie rod arm 10b (the other end side of the front link mechanism 10) on the side opposite to the driver's seat side,
An auxiliary front drag link 8A is connected via an auxiliary front arm 11A. An auxiliary front idler arm 6A is connected to the auxiliary front drag link 8A, and this auxiliary front idler arm 6A is swingably supported by the other frame 7A.

Rear tie rod arm 16 on the side opposite to the driver's seat
b (on the other end side of the rear link mechanism 16), an auxiliary rear drag link 14A is connected via an auxiliary rear arm 17A. Auxiliary rear drag link 1
An auxiliary rear idler arm 13A is connected to the frame 4A, and the auxiliary rear idler arm 13A is swingably supported by the other frame 7A.

The auxiliary front idler arm 6A and the auxiliary rear idler arm 13A are connected by a middle link 19.

According to the above configuration, when the front front wheels are lifted up due to unevenness of the road surface and the load is distributed only between the front and rear wheels, the force from the booster 5 is transferred from the booster 5 to the driver's side front idler arm 6 to
Driver's side front drag link 8 → front arm 11 → front link mechanism 10 → auxiliary front arm 11A → auxiliary front drag link 8
A → Auxiliary front idler arm 6A → Middle link 19 → Auxiliary rear idler arm 13A → Auxiliary rear drag link 14A → Auxiliary rear arm 17
A→Rear link mechanism 16→Transmitted to the front and rear wheels. Therefore, the driver's seat side front drag link 8, the auxiliary front drag link 8A, and the auxiliary rear drag link 14A receive the same force from the booster 5.

On the other hand, the force from the power cylinder 12 is transferred from the power cylinder 12 to the rear idler arm 13 on the driver's seat side.
→Driver's seat side rear drag link 14→Rear arm 17→Rear link mechanism 16→Transmitted to the front and rear wheels.
Therefore, in the rear drag link 14 on the driver's seat side,
It receives only the force from the power cylinder 12.

Also, unlike the above-mentioned load distribution, if the front and rear wheels lift up and only the front wheels receive the force acting on the steering link, the driver's seat side rear drag link 14, the auxiliary rear drag link 14A, and the auxiliary front drag link Link 8A is power cylinder 1
2, while the driver's side front drag link 8 receives only the force from the booster 5.

Therefore, when the force acting on the steering link is received only by the front front wheels or the front and rear wheels, the driver's seat side front drag link 8 and the driver's seat side rear drag link 14 are connected to the booster 5 and the power cylinder 12. without simultaneously receiving the force from
Driver side front drag link 8 is booster 5
Only the force from the driver's side rear drag link 14
receives only the force from the power cylinder 12. That is, the force acting on the driver's seat side front drag link 8 or the driver's seat side rear drag link 14 can be reduced, and the strength can be reduced accordingly.

[Effect of idea]

As described above, according to the present invention, in a power steering system for a front two-axle vehicle, when the force acting on the steering link is received only from the two front wheels or the front and rear wheels, the front drag link or the rear drag link The force acting on the tug link can be reduced,
This has the effect of reducing the strength.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a power steering device for a two-axle front vehicle according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a conventional power steering device for a two-axle front vehicle. 1... Steering gear box, 2... Pitman arm, 4... Link, 5... Booster, 6... Driver's side front idler arm, 6
A...Auxiliary front idler arm, 7...One frame, 7A...Other frame, 8...Driver's side front drag link, 8A...Auxiliary front drag link, 9...Front front wheels, 10 ……
Front link mechanism, 11...Driver's side front arm, 11A...Auxiliary front arm, 12...
...Power cylinder, 13...Driver's side rear idler arm, 13A...Auxiliary rear idler arm,
14...Driver's side rear drag link, 14A...
...Auxiliary rear drag link, 15...Front and rear axle, 1
6... Rear link mechanism, 17... Driver's side rear arm, 17A... Auxiliary rear arm, 19... Middle link.

Claims (1)

[Scope of utility model registration request] A link is connected to the Pitman arm that is swung by the steering gearbox, and the driver's side front idler arm is connected to the booster operated by this link, and this driver's side front idler arm is swingably supported on one frame. This driver's side front drag link is connected to one end of the front link mechanism provided on the front-to-front axis via a front arm, while the booster is connected to the front drag link. The driver's side rear idler arm is connected to the operating power cylinder, and this driver's side rear idler arm is swingably supported on one frame and connected to the driver's side rear drag link. A two-axle front wheel vehicle in which a drag link is connected to one end of a rear link mechanism provided on the front and rear axes via a rear arm, and the front and rear wheels are interlocked and steered by a middle link. In a power steering system, the other end of the front link mechanism is connected to the auxiliary front drag link on the side opposite to the driver's seat via an auxiliary front arm, and this auxiliary front drag link is connected to the other frame side. The other end of the rear link mechanism is connected to the auxiliary rear drag link on the side opposite to the driver's seat via the auxiliary rear arm, and this auxiliary rear drag link is connected to the other end of the rear link mechanism. A power steering device for a two-axle front wheel vehicle, characterized in that it is connected to an auxiliary rear idler arm provided on a frame side, and further connects an auxiliary front idler arm and an auxiliary rear idler arm by a middle link.