JPH0114543Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a valve device in an integral power steering system for an automobile, and provides a device that does not give an unpleasant feeling while operating the steering wheel.

Figure 1 shows the general structure of a valve device used in a conventional integral power steering device.
A stub shaft 3 is connected to a steering shaft 2 provided with a steering shaft 2, and an inner rotor 4 is provided around the stub shaft 3, and a pin 5 protruding from the stub shaft 2 is provided on the inner rotor 4. The inner rotor 4 is connected to the inner rotor 4 by being inserted into a hole or groove 4a.

A torsion bar 6 is connected to the end of the stub shaft 2, a cylindrical portion 7a of an outer rotor 7 is provided on the outer periphery of the torsion bar 6, and a pin 8 is connected between the cylindrical portion 7a and the torsion bar 6.
connected by. The outer rotor 7
An inner rotor 4 is inserted into the inside of the rotor, and the two form a valve mechanism as shown in FIG.

9 is a piston, and a gear 10a of a sector shaft 10 meshes with a gear 9a provided on the outer periphery of the piston.

Oil for driving the steering device is supplied to the passage 11 from an oil pump (not shown),
The oil is returned to the oil tank through the discharge path 12.

Figure 2 shows the inner rotor 4 and outer rotor 7.
The hydraulic oil sent from the pump is supplied from the arrow P, and due to the relative displacement between the inner rotor 4 and the outer rotor 7 that occurs as the steering wheel 1 is operated, the hydraulic oil is supplied from the arrow P. The piston 9 is supplied to the left cylinder from L or to the right cylinder from arrow R.
is moved to the right or left, and the steering wheels are rotated left and right in accordance with the movement of the piston 9.

In the end, the rotation of the steering wheel 1 is caused by the stub shaft 2, the torsion bar 6, the outer rotor 7, and the pin 5 installed on the stub shaft 3.
The inner rotor 4 is rotated through the inner rotor 4 to operate the valve device as described above.

Now, a gap S is usually provided between the pin 5 protruding from the stub shaft 3 and the hole or groove 5a provided in the inner rotor 4 so that the inner rotor 4 and the outer rotor 7 can move smoothly.
(FIG. 3) This gap S is important for connecting the stub shaft 3 and the inner rotor 4. If the gap S is large, there will be a considerable amount of space between the inner rotor 4 and the stub shaft 3. This has the disadvantage that the response of the valve device V itself deteriorates.

As mentioned above, the gap S between the inner rotor 4 and the pin 5 is important for the smooth operation of the valve device V, but if there is this gap S, there will be no flow from the running wheel to the sector shaft 10, etc. The inner rotor 4 collides with the pin 5 due to the impact force received, and this impact vibration is transmitted to the steering wheel 1.

The larger the gap S between the inner rotor 4 and the pin 5, the larger the impact vibration, which has the drawback of giving the driver an uncomfortable feeling, that is, a "snapping" feeling through the steering wheel 1.

However, if there is no gap S between the inner rotor 4 and the pin 5, the inner rotor 4
There is a drawback that the movement between the outer rotor 7 and the outer rotor 7 is poor, resulting in malfunction, and for this reason, it has been substantially difficult to completely eliminate this gap S in conventional devices.

The present invention was developed by focusing on the above problem, and in order to make the inner rotor, which switches hydraulic pressure to the stub shaft, follow, in an integral power steering device, there is a gap between the pin attached to the stub shaft and the inner rotor. It is an object of the present invention to provide a valve device for an integral power steering device that eliminates the unpleasant operating feeling of a steering wheel caused by the gap between the two sides and has excellent responsiveness.

The structure of the valve device in the integral power steering device of the present invention to achieve the above object is such that a pin is attached to the stub shaft driven by the steering wheel, and the pin is attached to the inner rotor of the rotary valve surrounding the outer periphery of the stub shaft. It is characterized in that an engaging part with the pin is provided, and an elastic member is fitted between the engaging part and the pin.

The engaging portion can be formed by a hole, a groove, etc. provided in the inner rotor.

(1) The elastic member transmits force while being elastically deformed, so that the stub shaft and the inner rotor can move relative to each other, so the inner rotor quickly follows the movement of the stub shaft. (2) Since the deformable elastic member is interposed between the stub shaft and the inner rotor, the impact from the running wheels is prevented from being transmitted to the steering wheel, and (3) the above-mentioned Discomfort when operating the steering wheel due to the gap between the pin and the inner rotor can be eliminated.

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

FIG. 4 shows the connecting part between the stub shaft 3 and the inner rotor 4 that constitute the valve device of the present invention, and shows an elastic body 13 between the hole or groove 4a provided in the inner rotor 4 and the pin 5. It is distinctive in that it is interposed.

The elastic body 13 is made of, for example, rubber or soft synthetic resin. The elastic body 13 is usually fixed by being baked on the outer periphery of the pin 5, but in some cases it may be baked on the inner surface of the hole or groove 4a of the inner rotor 4. The point is that the gap S formed between the hole or groove 4a of the inner rotor 4 and the pin 5 may be filled with an elastic body.

The thickness of the elastic body 13 is the same as that of the hole or groove 4.
It is sufficient that the inner rotor 4 can be smoothly driven by eliminating "backlash" between the inner rotor 4 and the pin 5, and care should be taken not to make it thicker than necessary. (If the elastic body is made too thick, there is a risk of problems in durability.) Fig. 5 shows another embodiment of the present invention, in which an elastic body 13 and a metal cylindrical body 14 are provided around the outer circumference of the pin 5. This cylindrical body 14 is preferably press-fitted into the hole or groove 4a of the inner rotor 4 and fixed.

In the present invention, as described above, the pin 5, which is a means for connecting the stub shaft 3 and the inner rotor 4, is connected via the elastic body 13, so that the two are connected with virtually no gap. As a result, the movement of the stub shaft 3 is transmitted to the inner rotor 4 as is.

In that case, the movement of the stub shaft 3 is not directly transmitted to the inner rotor 4, but is transmitted via the elastic body 13, so that the movement of the stub shaft 3 is not directly transmitted to the inner rotor 4.
rotates smoothly and the valve mechanism operates accurately, and unlike conventional devices, the impact force of the running wheels is not transmitted to the steering wheel 1. Therefore, the driver can ensure that the running wheels are not moving forward of the vehicle. The steering wheel 1 can be operated with good feeling despite the vibrations caused by the vibration.

In the embodiment of the present invention, rubber or soft synthetic resin was used as the elastic body 13, but the present invention is not limited to this, and any material having the same effect as this elastic body may be used, for example. Metal springs can also be used.

As explained above, in the valve device of the integral power steering device of the present invention, a pin is attached to the stub shaft driven by the steering wheel, and a portion engaging with the pin is attached to the inner rotor of the rotary valve surrounding the outer periphery of the stub shaft. Since the elastic member is fitted between the engaging portion and the pin, the following effects can be obtained.

That is, even though a space is provided between the pin on which the stub shaft is attached and the inner rotor to prevent malfunction, the responsiveness is improved because an elastic member is fitted there. It is possible to provide a rotary valve device that does not cause discomfort when operating the steering wheel due to the provision of a gap.

[Brief explanation of the drawing]

Figure 1 is a sectional view schematically showing the rotary valve device of integral steering, and Figure 2 is a cross-sectional view showing the outline of the rotary valve device of integral steering.
The structure of the valve mechanism is shown in the AA cross section of the figure. FIG. 3 is a diagram showing the relationship between the stub shaft, inner rotor, and pin of a conventional device. FIG. 4 is a cross-sectional view of a portion similar to FIG. 3 showing the essential parts of the present invention. FIG. 5 shows another embodiment of the present invention, in which an elastic body and a metal cylinder are provided around the outer periphery of the pin. 1... Steering wheel, 3... Stub shaft, 4... Inner rotor, 4a... Hole or groove, 5... Pin, 6... Torsion bar, 7
...Outer rotor, 9...Piston, 10...
Sector shaft, 13...Elastic body.

Claims (1)

[Scope of utility model registration request] A pin is attached to a stub shaft that is driven by a steering wheel, an engaging portion for engaging the pin is provided on an inner rotor of a rotary valve surrounding the outer periphery of the stub shaft, and an elastic member is provided between the engaging portion and the pin. A valve device in the fitted integral power steering device.