JPS621017Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rack and pinion type steering device, and its purpose is to separate the pinion shaft and the servo valve device that controls the power cylinder, and to stabilize the performance of the servo valve device.

In a conventional servo valve device for a general power steering device, the main valve member and the output shaft are integrally constructed. Therefore, when this is applied to a rack and pinion type steering device in which the output shaft is a pinion shaft, the pinion shaft is supported at both ends by bearings in the housing of the servo valve device, so the control valve is not easily manufactured. There was a problem in which valve performance deteriorated due to the influence of alignment errors between the pinion shaft and control valve and bending of the pinion shaft.

The present invention provides a practical steering device which eliminates the problems of the conventional power steering device, particularly in the rack and pinion type, through a simple and improved structure.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 show a first embodiment of a rack and pinion type power steering device having a servo valve device 7, in which 1 is a housing and 2 is a pinion shaft. This pinion shaft 2 has bearings 3 and 4 at both ends.
It is rotatably supported within the housing 1 and meshes with a rack shaft 5 perpendicular thereto. Reference numeral 6 denotes a rack receiving body, which is attached to the rack shaft 5 by a spring 6a.
is pressed against the back of the The rack shaft 5 corresponds to a piston rod of a power cylinder (not shown), and a second shaft is provided in both chambers of the power cylinder.
It is connected via a pipeline to the supply/discharge port of the servo valve device 7 shown in the figure.

The servo valve device 7 is disclosed in, for example, Japanese Patent Application Laid-Open No. 51-141132.
As shown in FIG. 2, it has a pressure oil supply port 20, a discharge port 21, and the above-mentioned supply/discharge port 22.
1 and the supply/discharge port 22 is provided with a control valve.

That is, 9 is a sleeve valve member rotatably fitted into the housing 1. This sleeve valve member 9 is separated from the pinion shaft 2 and connected by a pin 19 and a notch 18. A plurality of notches 18 are provided on the edge of the sleeve valve member 9, and a pin 19 is driven into the pinion shaft 2 and engaged in the notch 18 without any play in the rotational direction, but not in the front-rear direction and in the bending direction. On the other hand, the sleeve valve member 9 and the pinion shaft 2 are connected to each other so as to allow relative movement therebetween.

A main valve member 8 having two separate valve chambers is fitted into the sleeve valve member 9 connected to the pinion shaft 2 by the above-described structure. This main valve member 8 is also separated from the pinion shaft 2 in the axial direction,
As is clear from FIG. 3, it is integrally connected to the sleeve valve member 9 by a pin 10.

Further, a steering shaft 11 having a first flapper valve 13 and a second flapper valve 14 protrudingly arranged in the two valve chambers of the main valve member 8 is connected to the pinion shaft 2 via a bearing 15 at one end thereof. The other end is supported by the housing 1 via a bearing 16.
The steering shaft 11 and the pinion shaft 2 are
The torsion bar 17 that passes through the shaft center hole vertically connects the pin 2.
3a and 23b. FIG. 5 shows a second embodiment, in which the pinion shaft 2 is tapered and an adjustment nut 25 is installed at the bearing 3.
The sleeve valve member 9 is provided with two annular grooves 24 to adjust the position of the pinion shaft 2 in the axial direction by rotating the adjustment nut 25 to adjust the backlash with the rack shaft 5. Part 8
This configuration eliminates the flow of pressure oil between the pinion shaft 2 and the pinion shaft 2, and the other configurations are completely the same as the first embodiment.

Since the present invention has the above-mentioned structure, the lateral rotational force of the steering wheel is reduced by controlling the unillustrated power cylinder by the action of the servo valve device 7, and the steering wheel can be moved easily. Deflecting is just like a conventional power steering device.

Therefore, according to the present invention, the pinion shaft 2 and the control valve, that is, the sleeve valve member 9 and the main valve member 8 of the servo valve device 7, which were conventionally integrated, are separated, and the sleeve valve member 9 is separated from the pinion valve member 9. axis 2
The notch 18 and the pin 19 engage with each other in the rotational direction without play, and are connected to allow relative movement between the two in the front-rear direction and bending direction. 10, etc., so even if there is some misalignment between the pinion shaft 2 and the control valve due to manufacturing errors, or even if the pinion shaft 2 is bent, the pinion shaft 2, the sleeve valve member 9, and the main valve member 8, and thereby are not affected by the alignment between the pinion shaft 2 and the control valve or the bending of the pinion shaft 2. This has the advantage of stable and improved valve performance.

Furthermore, since the pinion shaft and the control valve are separated, the pinion shaft is tapered as shown in Figure 5, and an adjustment nut is used to adjust the pinion shaft in the axial direction independently of the control valve. It also has the advantage of being able to freely adjust the backlash with the rack shaft.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the center cross section of the device of the present invention, Fig. 2 is a sectional view taken along the line in Fig. 1, Fig. 3 is a sectional view taken along the line in Fig. 2, and Fig. 4 is a sectional view taken along the line in Fig. 2. ,
FIG. 5 is a sectional view corresponding to the line taken along the line in FIG. 1, showing another embodiment. 1...Housing, 2...Pinion shaft, 3, 4
... Bearing, 5 ... Rack shaft, 7 ... Servo valve device, 8 ... Main valve member, 9 ... Sleeve valve member, 1
0...Pin, 11...Steering shaft, 13, 14...Flapper valve, 15, 16...Bearing, 17...Torsion bar, 18...Notch, 19...Pin, 25...
…Adjust nuts.

Claims (1)

[Scope of utility model registration request] Both ends of a pinion shaft that meshes with a piston rack shaft of a power cylinder connected to a steering wheel via a required connection means are rotatably supported in a housing via bearings, and a sleeve valve member is rotated within this housing. The sleeve valve member is connected to the pinion shaft by a pin in a rotational direction and allows relative movement in the front-rear direction and bending direction, and the sleeve valve member is connected to the pinion shaft by a pin, and A pinion shaft and a main valve member separated in the axial direction are fitted and integrally connected, and one end of a steering shaft provided with a valve member that is relatively rotatably housed in the main valve member is connected to the pinion shaft via a bearing. What is claimed is: 1. A rack and pinion type steering device, characterized in that the other end of the rack and pinion type steering device is supported by a housing via a bearing, and the steering shaft and pinion shaft are connected by a torsion bar.