JPS60107459A - Method for controlling flow rate of pressure oil into power steering gear and hydraulic reaction force chamber - Google Patents

Abstract

PURPOSE:To make capacity of a pump small by moving a control valve of a flow controller by means of the pressure in a power steering gear and supplying the pressure oil for a hydraulic reaction force chamber to the power steering gear. CONSTITUTION:As the pressure in a hydraulic reaction force chamber 22 is increased in straight running with high speed and an input shaft is pressed, the shaking of a steering wheel is eliminated and good stability of steering is obtained. In shifting steering with low speed, the pressure in a power steering gear 15 is increased and the pressure in a passage 16 is also increased, and a control valve 23 is moved to the left side to close a discharge port 17a and to open 17b, and therefore the pressure oil from a passage 20 is supplied to a passage 14 and the operation of the steering wheel is eased. In shifting steering with high speed, the control valve 23 is moved by the pressure difference between the power steering gear 15 and the hydraulic reaction force chamber 22 and the operation of the steering wheel is assisted by power. When the pressure in the hydraulic reaction force chamber 22 is larger than that in the power steering gear 15, the control valve is not moved and therefore it is possible to operate the steering wheel with weight and stability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for controlling the flow rate of pressurized oil to a power steering gear of an automobile and to a hydraulic reaction chamber for preventing wobbling of a steering wheel shaft during high-speed driving.

(Prior Art) Recent power steering devices for automobiles are provided with a hydraulic reaction force chamber in order to improve the stability of the steering feel during high-speed driving. Therefore, two hydraulic power sources are required for the power steering gear and the hydraulic reaction chamber, but conventionally, two pumps that produce the required flow rates for the power steering gear and the hydraulic reaction chamber, or a compound pump that integrates the two, have been used. Both had the disadvantage of requiring a large amount of space.

(Objective) The object of the present invention is to control the pressure oil for the hydraulic reaction chamber toward the power steering gear when it is not needed, and to stably perform the power steering gear and steering wheel steering during high-speed driving using the minimum capacity pump.

(Example) FIG. 1 shows a first embodiment of the apparatus for carrying out the method of the present invention.

A rotor 3 is attached to a shaft 2 rotatably mounted in a housing 1, and a vane 4 is fitted into the rotor 3 so as to be able to slide along the inner surface of a cam ring 5. A suction boat 7 is mounted on the side plate 6 on one side of the cam ring 5.
a, 7b and a discharge port 8 are formed, and a suction port 10a, an IOA, and a discharge port 11 are formed on the other side plate 9. Pressure oil from the discharge port 8 enters the flow rate control chamber 13 through the passage 12, is guided to the power steering gear 15 through the passage 14, and a portion is guided to the right side of the flow rate control device 17 through the passage 16. On the other hand, the discharge port 11
The pressure oil enters the flow rate control chamber 19 through the passage 18, passes through the passage 20, passes through the flow rate control device 17, and is guided from the passage 21 to the hydraulic reaction force chamber 22. Reference numeral 23 denotes a control valve of the flow rate control device 17, which is pushed by springs 24 and 25. The passage 21 and the left side of the flow rate control device 17 communicate through a passage 26.

27 is a suction tube, 28 is a passage, and 29 is a low pressure chamber.

Next, the method of the present invention will be explained. Oil sucked through the suction tube 27 enters the low pressure chamber 29 through the passage 28, enters the cam ring 5 through suction ports 7α, 7b110a, and 10.6, and is discharged from the discharge port 8.11 by the bay 74 that rotates together with the rotor 3. Ru. During normal low-speed straight running, pressure oil from the discharge port 8 enters the flow control chamber 13 through the passage 12 and is guided to the power steering gear 5 through the passage 14, while pressure oil from the discharge port 11 flows through the passage 18 into the flow control chamber 19. enters the flow rate control device 17 through the passage 20, enters the passage 21 through the discharge port 17α, and enters the hydraulic reaction chamber 22.
guided by. At this time, the control valve 23 opens the discharge port 1 to the passage 14.
7b is closed.

When the vehicle is traveling straight at high speed, the pressure in the hydraulic reaction force chamber 22 increases and pressurizes the input shaft, which eliminates the wobbling of the steering wheel and improves steering stability.

At this time, the control valve 23 moves to the right due to the increase in pressure in the passage 26, but the flow of pressure oil remains the same as before.

Here, the pressure in the hydraulic reaction force chamber 22 is controlled by the vehicle speed.

Next, during low-speed steering, the pressure in the power steering gear 15 increases, and the pressure in the passage 1G also increases, and the control valve 23 is moved to the left to close the discharge port 17 (Z and open 17b), thereby discharging the pressure oil from the passage 20. is supplied to the passage 14 to facilitate handle operation.

Next, during high-speed steering, the control valve 23 moves due to the pressure difference between the power steering gear 15 and the hydraulic reaction chamber 22 to power assist the steering wheel operation. When the pressure in the hydraulic reaction force chamber 22 is greater, the control valve 23 does not move and power assist is not provided, allowing for heavy but stable steering operation.

FIG. 6 shows a second embodiment of the apparatus for carrying out the method of the present invention, in which the pressure of the power steering gear 15 is sensed by a sensor, the pressure switch 30 is operated, and the valve 31 is electrically operated to carry out the same control as described above. Is going.

FIG. 7 shows a third embodiment of the apparatus for carrying out the method of the present invention, with two pairs of discharge ports 8 (Z, 86 and 11α, 116).
The same control as above is performed.

FIG. 8 shows a fourth embodiment of the apparatus for implementing the method of the present invention, in which a double pump using two sets of cam rings, rotors, vanes, and plates performs the same control as described above.

(Effects) According to the present invention, the pressure oil from the plurality of discharge ports formed in the pump device is separated into two parts, one pressure oil is guided to the power steering gear, and the other pressure oil is passed through the flow rate control device for hydraulic reaction. The pressure oil for the hydraulic reaction force chamber is supplied to the power steering gear by moving the control valve of the flow control device according to the pressure of the power steering gear, so that the flow rate required for the power steering gear is, for example, 61 J/min. , the flow rate required for the hydraulic reaction chamber is 3
11/min, conventional pumps with one pair of discharge ports require a pump capacity of 12 A'/min for the basic discharge volume, but with the present invention, the discharge volume to the power steering gear is also transferred to the hydraulic reaction chamber. The discharge amount is also 37! /min,
Since the pressure oil for the hydraulic reaction chamber can be supplied to the power steering gear when necessary, the basic discharge amount is half of the conventional one, 61! / m i
n, the pump capacity can be reduced, and less space is required.

[Brief explanation of the drawing]

1 is a front sectional view of a first embodiment of the method of the present invention, FIG. 2 is a left side view of the right side plate of FIG. 1, FIG. 3 is a side sectional view of the cam ring part of FIG. 1, and FIG. The figure is a right side view of the left side plate in Figure 1, Figure 5 is an explanatory diagram of the flow rate control method according to the first embodiment, Figure 6 is an explanatory diagram of the flow rate control method according to the second embodiment, and Figure 7 is an illustration of the flow rate control method according to the second embodiment. FIG. 8 is a front cross-sectional view of a fourth embodiment of the method of the present invention. 1... Housing, 2... Shaft, 3... Rotor, 4... Vane, 5... Cam ring, 6.9...
・Side plate, 8, 8a, 8b, 11. IC, 11
b - Discharge port, 17... Flow rate control device, 17
a, 17b...Discharge port, 23...Control valve. Patent applicant Koyo Automatic Machine Co., Ltd. Figure 1 1g345 Figure 5 Figure 6 Figure 15 Figure 7

Claims (1)

[Claims] The pressure oil from the plurality of discharge ports formed in the pump device is separated into two, one pressure oil is guided to the power steering gear, and the other pressure oil is guided to the hydraulic reaction chamber via the flow control device, and the pressure oil is guided to the power steering gear. A method for controlling the flow rate of pressure oil to a power steering gear and a hydraulic reaction chamber, in which a control valve of a flow control device is moved by pressure to supply pressure oil for the hydraulic reaction chamber to the power steering gear.