JPH065946Y2 - Power steering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power steering apparatus that swings a pinion shaft to move a spool and supplies pressure oil to a power cylinder.

(Conventional Device) FIGS. 2 to 4 show a conventional device, in which the pinion shaft 11 installed in the casing 10 of the drive mechanism D is shown with one end thereof protruding outside the casing 10. While not connected to the handle, the other end is connected to a pin 12 provided in the casing 10. The pinion 13 formed on the pinion shaft 11 is a rack that penetrates the casing 10.
It is engaged with 14.

Further, in the casing 10, the main body 1 of the control valve portion V is provided.
And the main body 2 of the hydraulic reaction force mechanism K are juxtaposed in the axial direction of the pinion shaft 11. That is, as shown in FIGS. 3 and 4, a pair of through bolt holes 3 and 4 are formed in the two main bodies 1 and 2.
And 5 and 6 are formed, and the through bolt holes 3 to
Using a tie rod (not shown) inserted in 6, insert the casing 1
0 and the main bodies 1 and 2 are connected.

The main body 1 of the control valve portion V is internally provided with a spool 15 and a spring provided at one end of the spool 15.
By the action of 16, the spool 15 normally keeps the neutral position shown. A connection hole 17 is formed in the spool 15, and a connection 18 of the swing lever 18 is formed in the connection hole 17.
a is inserted. The swing lever 18 is provided on the pinion shaft 11
When the pinion shaft 11 swings, the swing lever 18 also swings around a fulcrum 19.

A slider 20 that moves in the same direction as the spool 15 is installed in the main body 2 of the hydraulic reaction mechanism K, and a connecting hole 21 is formed at the center of the slider 20.
A connecting pin 23a of a rocking lever 23 that is linked to the pinion shaft 11 and rocks around a fulcrum 22 is inserted into the pin 21. In this way, both ends of the slider 20 are made to face the reaction force chambers 26, 27 via the spring bearings 24, 25. Then, springs 28 and 29 are provided in the reaction force 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. That is, this slider
20 and the spool 15 are arranged so that their phases are the same. For that purpose, the centering work between the hydraulic reaction force mechanism K and the control valve portion V must be performed accurately.

The reaction force chambers 26 and 27 as described above are connected to a solenoid valve (not shown), and depending on the traveling conditions of the vehicle,
The pressure inside the reaction force chambers 26 and 27 is adjusted.

Then, when the handle is rotated, the rotational force is transmitted to the pinion shaft 11. Even if the pinion shaft 11 rotates in this way, if the deflection resistance is large, the rack 14 does not move, and the pinion shaft 11 swings accordingly. When the pinion shaft 11 swings, the swing levers 18 and 23 swing accordingly, and the spool 15 and the slider 20 move. That is, the spool 15 is switched according to the rotation of the handle, and the oil discharged from the pump P is supplied to the power cylinder to maintain the power assist state.

On the other hand, according to the traveling condition of the vehicle, the pressure via the solenoid valve flows into the reaction force chambers 26, 27.When this pressure reaches the maximum, the power assist state is changed to the manual steering state. Switch.

That is, when the pressure in the reaction force chambers 26, 27 becomes maximum, the slider 20 is locked, so that even if the pinion shaft 11 tries to swing, the swing is hindered. Therefore, when the steering wheel is rotated, even if the turning resistance is large, the pinion shaft 11 does not swing, the spool 15 does not switch, and the rotational force of the pinion shaft 11 is directly transmitted to the rack 14. , This rack 14 moves.

Since the rack 14 moves with the rotation of the steering wheel, the manual steering state is set as described above.

(Problems to be Solved by the Present Invention) In the conventional device as described above, the casing 10, the main body 1 of the control valve V and the main body 2 of the hydraulic reaction mechanism K are connected to each other.
Since they are connected by a book tie rod, the control valve portion V and the hydraulic reaction force mechanism K must be centered at the same time.

However, centering the control valve portion V and the hydraulic reaction mechanism K, which are separate bodies, at the same time is extremely difficult for the work.

An object of the present invention is to provide a device that simplifies the centering work by first completing the centering of the hydraulic reaction force mechanism and then centering the control valve portion.

(Means for Solving the Problems) The present invention is provided with a control valve section mainly composed of a spool that moves with the swing of the pinion shaft, and a hydraulic reaction force mechanism that restricts the axial movement of the spool. A power steering device in which the control valve section and the hydraulic reaction mechanism are separated from each other, and both of them are arranged side by side in the axial direction of the pinion shaft with respect to the casing of the drive mechanism in which a rack or the like is installed. Is.

Based on the above-mentioned device, the present invention relates to a casing and a main body of a hydraulic reaction mechanism, which is a first structure for connecting them.
And a second bolt hole different from the first bolt hole is formed in each of the casing, the main body of the reaction mechanism, and the main body of the control valve portion.
Is characterized in that the hydraulic reaction mechanism is centered by passing the bolt through the bolt hole, and then the control valve portion is centered by passing the tie rod through the second bolt hole.

(Operation of the present invention) Since the present invention is configured as described above, first, the main body of the hydraulic reaction mechanism is joined to the casing of the drive mechanism while being centered, and then the main body of the control valve unit is centered. , Is joined to the hydraulic reaction mechanism.

(Effect of the present invention) According to the device of the present invention, the centering of the control valve portion can be performed after the centering of the hydraulic reaction mechanism, so that the centering work is simplified.

(Embodiment of the present invention) FIG. 1 shows a hydraulic reaction mechanism K of an embodiment of the present invention. The main body 2 of the hydraulic reaction mechanism K has bolt holes other than through bolt holes 3 and 4. 7 and 8, the casing 10 is also formed with bolt holes (not shown) at positions corresponding to the bolt holes 7 and 8.

Since the configuration other than the above is the same as the conventional one, detailed description thereof will be omitted, and while referring to FIGS.
The same components will be described with the same reference numerals.

Then, in order to assemble the apparatus of this embodiment, the main body 2 of the hydraulic reaction mechanism K is joined to the casing 10 of the drive mechanism D, and the casing 10 and the main body are screwed into the bolt holes 7 and 8. 2, and the hydraulic reaction force mechanism K is also centered at this time.

After the centering of the hydraulic reaction mechanism K is completed in this way, the main body 1 of the control valve portion V is joined to the main body 2, and the casing 10 and the main bodies 1 and 2 are connected by tie rods as in the conventional case. To do. When the casing 10 and the main bodies 1 and 2 are connected by the tie rods, the control valve portion V is centered at the same time.

As described above, since the hydraulic reaction force mechanism K is first positioned, that is, centered, and then the control valve portion V is centered, the centering work is easier than the conventional case where both of them are centered at the same time. become.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of the present invention, FIGS. 2 to 4 show a conventional apparatus, FIG. 2 is a sectional view, and FIG. 3 is a sectional view of FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3 to 6 ... through bolt hole, 7, 8 ... bolt hole, 10 ...
Casing, 11 …… pinion shaft, 14 …… rack, 15 ……
Spool, D ... Drive mechanism, V ... Control valve section, K ...
… Hydraulic reaction mechanism.

Claims (1)

[Scope of utility model registration request] 1. A control valve section having a spool as a main element, which moves with the swing of a pinion shaft, and a hydraulic reaction force mechanism for restricting axial movement of the spool, and the control valve section and the hydraulic pressure. In a power steering apparatus in which a reaction force mechanism is separated from each other, and both of them are arranged side by side in the axial direction of the pinion shaft with respect to a casing of a drive mechanism in which a rack or the like is installed, the casing and the main body of the hydraulic reaction force mechanism are To
A first bolt hole for connecting them is formed, and a second bolt hole different from the first bolt hole is formed in each of the casing, the reaction mechanism main body, and the control valve body. A power steering apparatus configured to form a bolt through the first bolt hole to center the hydraulic reaction mechanism, and then pass a tie rod through the second bolt hole to center the control valve portion.