JPH0214558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pump device for a power steering device, and an object of the present invention is to enable easy rearrangement of the direction of the pressure fluid discharge port depending on the installation position in the engine. That's true.

Generally, a pump device used in a power steering device is attached to the side of an automobile engine so that the pump rotor is rotationally driven by the engine, and is connected to the engine output shaft via a belt transmission device. At this time, the pump device is installed on the left side or right side of the engine depending on the installation position of the steering wheel (left steering wheel, right steering wheel), and its discharge port and reservoir button are connected to the supply and discharge port of the power steering device via a pipe. connected.

In such a pump device, it is necessary to change the direction of the discharge port depending on its mounting position so that it does not interfere with the engine.For this reason, conventionally, two types of pump devices are prepared depending on the mounting position. During assembly, the operator selects the required pump device according to the mounting position of the handle.

The present invention solves these conventional problems, and features a simple structure that allows one type of pump device to be installed on either the left or right side of the engine by changing the direction of the discharge port. It is something to do.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a pump housing, and a hollow chamber 2 with a bottom is formed in this pump housing 1, and this hollow chamber 2 is opened at one end surface of the pump housing 1. A rotating shaft 4 is inserted through a lid member 3 that closes the opening of the hollow chamber 2, and is rotatably supported by a bearing. The hollow chamber 2 includes a cam ring 5 that is in contact with one end surface of the lid member 3, a side plate 6 that is in contact with the other side of this cam ring 5, and a press plate 7 that is in contact with the other side of this side plate 6.
is stored. A cam surface is formed on the inner periphery of the cam ring 5, and a rotor 9 is housed within the cam ring 5. The rotor 9 holds a plurality of vanes 8 whose outer ends are in sliding contact with the cam surface so as to be slidable in the radial direction. This rotor 9 is engaged with one end of the rotating shaft 4 by a spline. The left side surface of the rotor 9 and the left end surface of the vane 8 are in sliding contact with the end surface of the lid member 3, and the right side surface of the rotor 9 and the right end surface of the vane 8 are in sliding contact with the side surface of the side plate 6, and each sliding surface has a sealing effect. was done,
As a result, a plurality of pump chambers partitioned by the vanes 8 are formed between the cam surface of the cam ring 5 and the rotor 9, and the volume of each pump chamber changes as the rotor 9 rotates. A lid member 3 and a side plate 6 are provided corresponding to the pump chamber that performs the expansion stroke.
A suction port 10 is formed therein, and a discharge groove 26 is formed in the lid member 3 and the side plate 6 corresponding to a pump chamber that performs a compression stroke. Suction port 10 formed in lid member 3 and side plate 6
are communicated with each other by a passage 27 formed between the cam ring 5 and the pump housing 1. Further, the discharge groove 26 formed in the side plate 6 communicates with the pressure chamber 29 through a through hole 28 formed in the pressure plate 7. Further, a circular mounting seat 23 is recessed in the pump housing 1, and a bypass passage 13 is opened at the center of the mounting seat 23, and a discharge passage 14 is opened at a position offset from the bypass passage 13 in the radial direction. When opened, the discharge passage 14 is connected to the pressure chamber 29.
I understand. Reference numeral 11 indicates a reservoir, and 12 indicates a fluid supply path communicating with the reservoir.

The present invention provides a pump main body having the above structure and a discharge port 16.
The valve housing 15 is separated from the valve housing 15. 1
8 is a spool valve built into the valve housing 15, and 19 is a control spool. Reference numeral 17 indicates a union connected to a pipe (not shown), and 24 indicates a detection port, which detects from the increase in pressure that the power steering device has been operated, and operates an air control valve to idle the engine.

This valve housing 1 separated from the pump body
A circular convex portion 20 that rotatably fits into the mounting seat 23 is formed at approximately the center position on the left and right sides of 5, and this convex portion 20 corresponds to the discharge passage 14 and communicates with a portion of the control spool 19. An annular passage 21 concentric with the protrusion 20 and a communication passage 22 bored in the center of the protrusion 20 that corresponds to the bypass passage 13 and communicates with the spool valve 18 are provided.

A pair of bolts 25 fasten and secure the valve housing 15 to the pump housing 1, and are arranged at symmetrical positions with respect to the axis of the valve housing 15.

In the above configuration, when the pump is driven, the fluid in the reservoir 11 is sucked into the pump chamber from the suction port 10 via the fluid supply path 12 and the bypass path 13, and is passed through the press plate 7 through the discharge groove 26 of the side plate 6. It is discharged into the pressure chamber 29 through the hole 28. The fluid discharged into the pressure chamber 29 enters the annular passage 21 of the valve housing 15 from the discharge passage 14, further passes through the fluid passage 19a formed in the control spool 19 and the constriction part 30, and then flows from the discharge port 16 to the power steering. It is sent to a collecting device. The fluid returned from the power steering device is led to the fluid supply path 12 through a return pipe (not shown) and sucked into the pump chamber again.

If the pump rotation speed is low, the pump discharge amount is also small, so the spool valve 18 closes the communication passage 22, and the entire amount is sent to the power steering device from the discharge port 16. However, as the rotation speed increases, the discharge amount decreases. also increases, and the communication passage 22 is opened to bypass the excess flow to the bypass passage 13.

Therefore, according to the present invention, the valve housing 15 having the discharge port 16 for delivering fluid to the power steering device is separated from the pump body and rotatably attached to the mounting seat 23 formed in the pump housing 1. No matter where the valve housing 15 is installed, it communicates with the discharge passage 14 through the annular passage 21, and the bypass passage 13 communicates with the communication passage 22. When assembling on the left or right side of the engine depending on the position (left-hand drive, right-hand drive), the valve housing 15 can be rotated 180 degrees to reverse the direction of the discharge port 16 to prevent the discharge port 16 from getting in the way of the engine. It can be rearranged so that it does not become Therefore, one type of pump device can be installed on either the left or right side of the engine, eliminating the need to prepare two types of pump devices corresponding to each mounting position as in the past, and the operator is free to assemble it. Eliminates the need to select the type of pump device.
In addition, once the discharge port is installed to face a specific direction during make-to-stock production, there is no need to disassemble the entire pump even if the specifications change. It has the advantage of being easy to rearrange as it only requires changing the mounting position.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the present invention, FIG. 2 is a view taken along the arrow in FIG. 1, and FIG. 3 is a sectional view taken along the line shown in FIG. 1...Pump housing, 5...Cam ring,
6...Side plate, 7...Press plate, 8
... Vane, 9 ... Rotor, 10 ... Suction port, 11 ... Reservoir, 12 ... Fluid supply path, 1
3...Bypass passage, 14...Discharge passage, 15...
...Valve housing, 16...Discharge port, 18...
Spool valve, 19... Control spool, 20... Convex portion, 21... Annular passage, 22... Communication passage, 23...
...Mounting seat, 25...bolts.

Claims (1)

[Claims] 1 A valve housing having a pressure fluid discharge port and a built-in spool for bypass-controlling the pressure fluid to a bypass passage is separated from the pump body, and the valve housing is installed in multiple positions so that the discharge port can be oriented in multiple positions. forming a circular mounting seat on the pump body for mounting at a certain position, the mounting seat has the bypass passage opened at a central position, and a discharge passage opened at a position offset in a radial direction from the bypass passage; The valve housing is provided with a circular convex portion that rotatably fits into the mounting seat, and the convex portion has a communication passage communicating with the bypass passage in the center thereof, and the discharge outlet concentrically with the convex portion. A pump device characterized by forming an annular passage communicating with the passage.