JPS61178264A - Steering operation limiting unit in steering device - Google Patents

Abstract

PURPOSE:To make it possible to turn a vehicle by a maximum steering angle in accordance with every various oscillating amount of a steering wheel shaft, by limiting the rotation of a pitman arm from exceeding a predetermined amount due to the movement of a limiting arm secured to the shaft in association with the vertical oscillation of the steering shaft exceeding a predetermined amount. CONSTITUTION:When a steering wheel shaft 1 tilts laterally, a limiting pin 14 goes away from a pin 17, and the limiting pin 14 simply moves freely along an elongated groove 16 during the vertical oscillating amounts of the right and left sections of the steering wheel shaft 1 are below a predetermined value with respect to the vehicle body, including the horizontal attitude of the steering shaft in which the steering shaft is not inclined to either one of left and right. Further, when the vertical oscillating amount exceeds a predetermined value so that the rotating amount of a pitman arm 8 reaches a predetermined value, the limiting pin 14 abuts against the front end side edge of the elongated groove 16, and therefore the pitman arm 8 is inhibited from further rotating due to the abutting action of the limiting pin 14. The limiting members such as, for example, the elongated groove 16, the limiting pin 14 are set so that it is possible to prevent steered wheels 12, 12 from being made in contact with the vehicle body 2 at the above-mentioned inhibiting position. Accordingly, it is possible to prevent such a risk that the inner side sections of the wheels are made into contact with the outside section of the vehicle body.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a motion regulating device in a steering device of a traveling vehicle such as a tractor, in which the left and right portions of a steering wheel shaft rotate around a center bin. This rocking motion when swinging up and down like a seesaw with respect to the VC vehicle body and this turning motion when the steering wheels make a sufficiently wide steering turn compete with each other, causing the steering wheel to move toward the outside of the vehicle body. The present invention proposes an effective steering operation regulating device for preventing the danger of the inner parts of the wheels coming into contact with each other.

[Conventional technology]

Conventionally, for example, a stopper that restricts excessive rotation of the pitman arm of the steering device was attached to the steering wheel shaft, or a neat left and right tie rod connected to the pitman arm, or a left and right end of this tie rod. It is known that a stopper is attached to the steering wheel axle to restrict the movement of a knuckle arm connected to the steering wheel.

However, when the steering wheel axle seesaws due to the unevenness of the road surface, the steering wheel also comes two layers closer to the vehicle body. The problem of contact cannot be solved with the above conventional devices. □ [Problem to be solved by the invention] In this invention, the regulation position of the steering operation is changed in accordance with the seesaw momentum VC of the steering wheel shaft, so that a rational regulation operation can be performed. This is a VC devised.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention has taken the following technical means □ That is, the left and right parts around the center bin (5) are
) The steering wheel axle (1) swings up and down relative to IIC.
The steering wheel axle (11) is provided with a king pin (11).
(Around I [steering wheel u that is pivotably supported so that the steering can be
In a steering device having a VC configuration in which zn is configured as a VC so that steering is turned by the rotational movement of a pitman arm (Iυ) of a steering mechanism, a regulation arm side fixed to a steering wheel axle (1),
There is a regulating member ←!9 which regulates the rotation of the pitman arm (lIl) by more than a certain amount of rotation of the steering wheel shaft (11) due to the movement of this regulating arm 0.

[Embodiment and operation] Next, an embodiment of the present invention will be described based on the drawings.

Fig. 2 shows a side view of the main part of the front part of the tractor as a traveling vehicle, and Fig. 2 shows a rear view of Fig. 1 as seen from the line A-A.
As shown, the left and right center portions of the steering wheel axle +11 are connected to centerbin bearings (31, +4) provided at the lower part of the vehicle body (2).
) is pivotally supported by the center bin (51K) which is loosely inserted in the front 11 direction, and the left and right parts of the steering wheel shaft (1) swing up and down like a seesaw with the entire center of the center bin (5). In the case of power steering shown as an example, the output shaft (7) 11' of the power steering unit (6)
The pitman arm (8), which is attached to C, rotates, and the tie rods (9χ (9)) connected to this box are
The knuckle arm 0υ is turned around the kingpin, thereby steering the left and right steering wheels aa and α3.

A regulation arm a3 is fixed near the left and right center of the steering wheel axle (1), a regulation bin fiak is protruded near the rotating tip of the pitman arm (8), and a regulation bin is attached to the long groove of the regulation member QS. Loosely insert I, and connect the VC near the rotating tip of the regulating arm α3.
A protruding bottle (171) is pushed through the regulating member ill.

Therefore, the steering wheel axle (1) moves the tilter from side to side,
When the regulation bin (141) moves away from the bin tiη, as shown in Fig. 1, the steering wheel axle (1) is in a substantially horizontal position with no inclination to the left or right. While the amount of vertical rocking of the left and right parts of the vehicle body (2) is below a certain value, the regulation pin A4 simply moves in the long groove (II), but as shown in FIG. When the amount of vertical swing exceeds a certain value and the amount of rotation of the pitman arm (8) reaches a predetermined value, the tip side edge (16a) of the long groove fIB comes into contact with the regulation bin I, This contact action causes the Pitman arm (8) to
In this blocking position, the rudder wheels fiz, aa are connected to each of the above-mentioned regulating members such as the long groove OQ1 regulating pin I so that they do not come into contact with the vehicle body (21K). All settings are set.

The above-mentioned regulating means may also be a cam mechanism,
The vertical movement of the steering wheel shaft (1) is performed in conjunction with VC, and the present invention can be fully applied even if the steering device is of the sector type.

The steering wheel axle (1) may be of an axle housing type in which a drive shaft is housed inside.

〔Effect of the invention〕

The steering motion regulating device according to the present invention is configured as described above, and the turning regulating motion of the steering wheels Q3, tJ2 is performed in relation to the vertical swing amount of the steering wheel shaft (1). Runotsu, steering wheel 0. Within the range where u3 does not touch,
The maximum steering turn can be made according to the amount of rocking of each of the steering wheel axles (1, 1), and the turning radius can be made sufficiently small, for example, on flat ground.

The above-mentioned conventional device had the disadvantage of always having to limit the amount of steering turning to a small value in consideration of the vertical swing of the steering wheel axle, but this invention provides the most rational steering regulation. The action was to be taken.

The line view and FIG. 2 are side views of the main parts of the device.

Code explanation 03... Steering wheel (13...
Regulation ground, O9... Regulation member

Claims (1)

[Claims] A steering wheel axle is provided around the center pin so that its left and right sides can swing up and down relative to the vehicle body.
A steering device in which a steering wheel, which is pivotally supported around a kingpin so as to be able to steer and turn, is configured to be steered and turned by a rotational operation of a pitman arm of a steering mechanism,
It has a regulating arm fixed to the steering wheel axle, and a regulating member that regulates the rotation of the pitman arm by more than a predetermined amount due to the movement of this regulating arm as the steering wheel axle vertically swings more than a certain amount. A steering motion regulating device in a steering device characterized by: