JPH022697Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a power steering system that moves the pinion shaft horizontally to move the spool, supplies pressure oil to the power cylinder, and regulates the movement of the spool in response to a predetermined running signal. Regarding the collecting device.

(Conventional Device) In the conventional device shown in FIG. 1, a spool 2 is installed inside a valve body 1, and both ends of the spool 2 are exposed to reaction force chambers 3 and 4. A connecting pin 6 provided on a pinion shaft 5 is connected to the spool 2. The pinion shaft 5 is connected to a handle H, and when the handle H is rotated,
The rotational force is transmitted to the pinion shaft 5.

When the handle H is rotated, the rack engaged with the pinion of the pinion shaft 5 does not move due to the switching resistance, but the pinion shaft rolls on a rack shaft (not shown) and moves in parallel. Along with this horizontal movement of the pinion shaft 5, the connecting pin 6
swings, the spool 2 moves, supplies hydraulic oil from the pump P to the power cylinder, and performs a power shift.

In addition, this device detects the running conditions of the vehicle with a detector D, controls the solenoid valve S according to the detection signal, and adjusts the pressure supplied to the reaction force chambers 3 and 4 according to the running signal. This maintains the steering reaction force transmitted to the driver in an optimal state.

In the conventional device as described above, the control valve part whose main element is the spool 2 and the hydraulic reaction force mechanism whose main elements are the reaction force chambers 3 and 4 are integrated, and therefore the vehicle In some cases, the equipment could not be installed.

In other words, the engine room where the device is installed is crowded with various parts such as engine parts, cross members, and piping.
The space for installing the device is also extremely limited.

However, since the above-mentioned conventional device integrates the hydraulic reaction force mechanism and the control valve section, the length of the control valve section in the axial direction becomes too long, which causes problems in the connection between the device and other parts. There was a drawback that it could not be installed due to interference.

(Purpose of the invention) This invention separates the control valve part and the hydraulic reaction force mechanism, shortens the axial length of the control valve part,
The purpose is to provide a power steering device that can be installed even in crowded places.

(Embodiment of the present invention) Figures 2 to 4 show an embodiment of this invention, in which a pinion shaft 11 installed inside the main body 10 is shown.
has one end protruding outward from the main body 10 and is connected to the handle H, while the other end is connected to a reaction force pin 12 provided inside the main body 10 that resists horizontal movement. The pinion 13 formed on the pinion shaft 11 is connected to the rack 1 that passes through the main body 10.
It is engaged with 4.

Further, in the main body 10, a control valve section V and a hydraulic reaction force mechanism K are arranged side by side in the axial direction of the pinion shaft 11.

A spool 15 is installed inside the control valve section V, and the spool 15 is normally maintained at the neutral position shown in the figure by the action of a spring 16 provided at one end of the spool 15. A connecting hole 17 is formed in this spool 15, and a connecting pin 18 is inserted into this connecting hole 17.

The connecting pin 18 is connected to the pinion shaft 11, and as the pinion shaft 11 is displaced in parallel on the rack axis, the connecting pin 18 is connected to the fulcrum 19.
It is made to oscillate around the center.

Further, the hydraulic reaction force mechanism K is equipped with a slider 20 that moves in the same direction as the spool 15, and a connecting hole 21 is formed in the center of the slider 20.
A connecting pin 23 is inserted which is connected to the connecting pin 1 and swings around a fulcrum 22. Slider 2 like this
Both ends of 0 are exposed to reaction force chambers 26 and 27 via spring receivers 24 and 25. Springs 28 and 29 are provided in the reaction chambers 26 and 27, and the slider 20 whose position is regulated by the action of the springs 28 and 29 corresponds to the neutral position of the spool 15. In other words, the slider 20 and the spool 15 are made to have the same phase.

The reaction force chambers 26, 27 thus constructed are connected to the solenoid valve S, and the pressure within the reaction force chambers 26, 27 is adjusted according to the running conditions of the vehicle.

When the handle H is rotated, the rotational force is transmitted to the pinion shaft 11, and the pinion shaft 11 rotates while bending the reaction pin 12. Even if the pinion shaft 11 rotates in this way, if the deflection resistance is large, the rack 14 will not move, and the pinion shaft 11 will move on the rack shaft accordingly. When the pinion shaft 11 moves, the connecting pin 1
8 and 23 swing to move the spool 15 and slider 20. That is, the spool 15 is switched in accordance with the rotation of the handle H, and the oil discharged from the pump P is supplied to the power cylinder to maintain the power assist state.

On the other hand, depending on the running conditions of the vehicle, the pressure passing through the solenoid valve S is applied to the reaction force chamber 26,
When this pressure reaches the maximum, the power assist state is switched to the manual steering state.

In other words, when the pressure within the reaction force chambers 26, 27 reaches its maximum, the slider 20 becomes locked, and even if the pinion shaft 11 attempts to move, its rocking is prevented. Therefore, when the handle H is rotated, even if the switching resistance is large, the pinion shaft 11 does not move and the spool 15 does not switch, and the rotational force of the spool shaft 11 is directly transmitted to the rack 14. This is easy 1
4 moves.

As the handle H rotates, the rack 14 moves, resulting in a manual steering condition as described above.

In addition, the reference numeral 30 in the figure is a holding member for the rack 14, and is for ensuring the engagement between the rack 14 and the pinion 13.

(Configuration of the present invention) The configuration of the present invention includes a control valve section whose main element is a spool that moves with the horizontal movement of the pinion shaft, and a hydraulic reaction force mechanism that restricts the axial movement of this spool. In the power steering device,
The control valve section and the hydraulic reaction force mechanism are separated,
Both of them are arranged in parallel in the axial direction of the pinion shaft, and the hydraulic reaction force mechanism is characterized in that the movement of the pinion shaft is restricted when pressure is introduced into the reaction chamber.

(Effects of the Present Invention) In this invention, as the control valve section and the hydraulic reaction force mechanism are separated as described above, the length in the direction of the control valve section can be shortened, and the installation space can be reduced accordingly.

[Brief explanation of the drawing]

Figure 1 is a diagram of the steering system of a conventional device, Figures 2 to 4 show an embodiment of this invention, Figure 2 is a sectional view, and Figure 3 is a diagram of the steering system of the conventional device.
FIG. 4 is a cross-sectional view taken along the - line in FIG. 2. 11...Pinion shaft, V...Control valve section, 1
5...Spool, K...Hydraulic reaction force mechanism, 26,2
7...Reaction force chamber.

Claims (1)

[Scope of utility model registration request] In the power steering device described above, the power steering device is equipped with a control valve section whose main element is a spool that moves with the parallel displacement of the pinion along the rack axis, and a hydraulic reaction force mechanism that regulates the axial movement of the spool. The control valve part and the hydraulic reaction force chamber are separated, and both are arranged in parallel in the axial direction of the pinion shaft, and the hydraulic reaction force mechanism controls the movement of the pinion shaft when pressure is introduced into the reaction force chamber. A power steering device configured to regulate