JPS6341278A - Actuating device for plural fluid apparatuses - Google Patents

Abstract

PURPOSE:To enable increase and decrease of the flow rate of the one apparatus without changing a flow rate to the other apparatus, by a method wherein a single pump is commonly used, flow dividers are respectively located to a delivery flow rate control means on the pump side and in a branch passage running to a fluid apparatus. CONSTITUTION:A suction port 11a of a pump 11 is connected to a reservoir 17, and a delivery port 11b is connected to a flow rate control valve 20 with an electromagnetic valve. A variable throttle 21a is built in an electromagnetic valve 21 in a control valve 20, and a spool valve 23, adapted to regulate the opening of a bypass port 22 so that pressures before and after the variable throttle 21a are kept at a specified value, and a spring 24 through the force of which to press in a direction in which the bypass port 22 is closed, are provided. The control valve 20 with an electromagnetic valve, paired with a constant delivery pump 11, has function of keeping a flow rate at a specified value irrespective of a change in the number of revolutions of a pump and serves as a flow rate control means which regulates a delivery flow rate to an arbitray value by changing the opening of the variable valve 21a.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for guiding fluid discharged from a hydraulic pump driven by an automobile engine to a plurality of fluid devices including a power steering device to operate the fluid devices. It is.

<Prior art> As a conventional fluid control device of this type,
As described in Japanese Patent No. 1289, there is a system in which a part of the working fluid of a pump for a power steering device is guided to a power braking device or the like to operate the same. In this case, in order to guide the fluid discharged from one constant discharge pump to a plurality of fluid devices, the flow rate is controlled to a constant flow rate by a flow rate control valve, and then the flow is divided by a flow divider. Therefore, the supply flow rate of the flow divider is constant, the flow rate of each distribution port is always constant, and each fluid device connected to the distribution port becomes an actuating device that operates with the supply flow rate constant. Therefore, it cannot be applied to devices that operate by actively changing the supply flow rate to the other fluid device.

For example, if one of the fluid devices is a power steering device, a constant flow rate is required, and the maximum operating pressure is set at a high pressure. If the other fluid device is a hydraulic motor for driving a cooling fan, it is necessary to variably control the rotation speed within a certain rotation range from a stopped state, and the flow rate is large and the operating pressure is relatively low. used in In order to operate a plurality of fluid devices having different operating characteristics, it was necessary to provide independent pumps and separate operating circuits.

<Problems to be Solved by the Invention> If the hydraulic circuits are separated into separate systems as described above, a plurality of pumps will be required, leading to an increase in cost. If a single pump system is used as in the conventional example, fluid devices having different operating characteristics cannot be used.

<Means for Solving the Problems> Therefore, the present invention makes it possible to control the fluid discharged from the pump and adjust the throttle opening in order to unify the pump system even for multiple fluid devices with different operating characteristics. A flow rate control means is provided with a solenoid valve that can arbitrarily adjust the delivery flow rate, and a flow diverter with a solenoid valve that can adjust the throttle opening is installed at the branch point of the fluid equipment supply path to connect each branch port to the first fluid equipment. Second
A solenoid valve control device is provided which is connected to the supply port of the fluid device and controls both of the solenoid valves in relation to each other when the supply flow rate of one fluid device is increased or decreased.

In order to increase the flow rate of one fluid device without changing the flow rate of the other fluid device, increase the delivery flow rate using the flow rate control means on the pump side and increase the divided flow rate of one side of the flow divider. ] Can be done. Also, without changing the delivery flow rate, n1. By changing the divided flow rate of the divider, it is possible to change the divided flow rate of each of the two divided flow ports.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, 10 is an automobile engine, 11 is a constant discharge pump, and a pulley 13 provided on a pump rotating shaft 12 is connected to an engine output shaft 16 via a belt 14 and a pulley 15. The suction port 11a of the pump 11 is connected to the reservoir 17, and the discharge port 11b is connected to the flow control valve 2 with a solenoid valve.
Connected to 0. A variable throttle 21a is built into the solenoid valve 21, and a spool valve 23 adjusts the opening degree of the bypass port 22 in order to keep the pressure difference before and after the variable throttle 21a constant, and a spool valve 23 adjusts the opening degree of the bypass port 22 in the direction of closing the bypass port 22. A pressing spring 24 is incorporated into the flow control valve 20. Bypass port 22 is connected to pump suction port 11a. A pressure relief valve 25 is inserted into a connecting line 28 between the supply line 26 and the low pressure line 27.

The flow control valve 20 with an electromagnetic valve, which is paired with the constant discharge pump 11, maintains the flow rate constant regardless of changes in the pump rotation speed and adjusts the delivery flow rate arbitrarily by changing the opening degree of the variable throttle 21a. This constitutes a flow control means for controlling the flow rate.

As a modification of this flow rate control means, a case where the pump is a variable discharge pump will be described. In Figure 2, 1
Reference numeral 11 denotes a variable discharge pump that changes the discharge amount by moving an eccentric ring, and a pulley 113 is provided on a pump rotating shaft 112, which is rotationally driven by the engine 10 via a belt as described above.

The pump discharge port 111b is provided with a cylinder 120 that adjusts the amount of eccentricity of the eccentric ring in order to keep the pressure difference before and after the variable throttle 121a constant. The pressure before and after the variable throttle 121a is introduced into the front and rear chambers of the cylinder 120, and when the pressure difference becomes large, the piston 123 is moved forward to reduce the eccentricity of the eccentric ring and the discharge amount. It operates to move backward and increase the amount of eccentricity of the eccentric ring, thereby increasing the discharge amount. As a result, the pressure difference before and after the variable throttle 121a is kept constant, and the delivery flow rate is kept constant regardless of changes in the pump rotation speed. Further, by applying a signal to the electromagnetic valve 121 and changing the opening degree of the variable throttle 121a, the flow rate can be increased or decreased accordingly. The solenoid valve 121 and cylinder 120 constitute a flow rate control means for the variable displacement pump. Note that 125 is a pressure relief valve. 30 is a flow divider with a solenoid valve, and a control spool 3 is installed in the valve housing 30a.
0b, a spring 30C is incorporated, and one branch port 31
is connected to a power steering device 35, and the other branch port 32 is connected to a hydraulic motor 36 for driving a cooling fan. A variable throttle 3 is provided between the supply line 26 and the control spool rear chamber 30d.
A solenoid valve 33 incorporating a valve 4 is provided, and by changing the opening degree of this variable throttle 34, the divided flow rate to the diverting port 32 is controlled. That is, the pressure before and after the variable throttle 34 is introduced into both end faces of the control spool 30b, and the orifice 31 is introduced to keep the pressure difference before and after the variable throttle 34 constant.
a, 32a, a constant flow rate corresponding to the opening degree of the variable throttle 34 flows to the distribution port 32, and the rest flows to the distribution port 31.

Outlet 37.3 of power steering device 35 and hydraulic motor 36
8 is connected to the reservoir 17 via a return line 39. 40 is a cooling fan driven by the hydraulic motor 36, and 41 is a radiator. 42 is a solenoid valve 21.3
3, to which signals from a water temperature sensor +43, a vehicle speed sensor 44, and a steering angle sensor 45 are input.

When increasing the supply flow rate of the hydraulic motor 36, the control bag W42 increases the opening degree of the variable throttle 34 of the solenoid valve 33 and also increases the opening degree of the variable throttle 21a of the solenoid valve 21. For example, the supply flow rate of the power steering device 35 is set to 61/
min, and the supply flow rate of the hydraulic motor 36 is 01/min.
In order to do this, the variable throttle 21a of the solenoid valve 21 must be
The opening degree is set such that the flow can be divided by min (Q+), and the variable throttle 34 of the solenoid valve 33 is kept in a closed state.

From this state, the supply flow rate of the hydraulic motor 36 is reduced to OIl/mi.
101 from n! /min to drive the cooling fan, the solenoid valve 21 is set to 16 j as shown in FIG.
2/min (Q+) opening and solenoid valve 33 to 101
/min (Q3) by setting the opening to 154
The flow rate of 7 m1n is 61/m1n at flow divider 3o.
(Q3) and 10 A/min (Q3),
The operation of the power steering device 35 and the driving of the cooling fan are achieved. Even if the cooling fan is stopped and its rotation controlled in this manner, a constant amount of fluid is continuously supplied to the power steering device 35, and even if there is only one pump system, the operation will not be hindered.

By the way, since it is more efficient in terms of power consumption that the flow rate supplied to the power steering device 35 is smaller during non-steering than during steady state, only the solenoid valve 33 is controlled during non-steering and steering. When the vehicle is not being steered, the variable throttle opening is increased to increase Q3 as shown in FIG. Furthermore, during steering, Q3 can be reduced as shown in FIG. 5 by reducing the aperture opening.

Furthermore, when driving at high speeds, a sense of steering stability can be obtained by lowering the power gain of the power steering device 35 and increasing the steering resistance, so as shown in FIG. 21 variable aperture opening is reduced, Q! It is also possible to control to reduce the

<Effects of the Invention> As described above, according to the present invention, the number of pumps is reduced to one, and a flow divider is provided in the pump-side delivery flow rate control means and the branch path to the fluid equipment, so that the flow rate can be controlled separately for each. Because of this, it is not only possible to increase or decrease the flow rate to one fluid device without changing the flow rate to the other fluid device, but it is also possible to change the split flow ratio of both fluid devices, which conventionally required two pumps. Even in the system that must be installed, only one pump is required, which has an economical effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a system diagram of the entire device, Fig. 2 is a partial system diagram when a variable displacement pump is used, and Fig. 3 is a flow rate characteristic when the cooling fan is driven. The figures shown in FIG. 4 and FIG. 5 show the relationship between the water temperature change and the branched flow rate, with FIG. 4 showing the flow rate characteristics when the vehicle is not being steered, and FIG. 5 showing the flow rate characteristics when the vehicle is being steered. FIG. 6 is a flow characteristic diagram showing the relationship between changes in vehicle speed and delivery flow iQ1. 11... Pump, 20... Flow rate control valve, 21...
Solenoid valve, 21a... Variable throttle, 30... Flow divider, 31.32... Diversion port, 33... Solenoid valve, 3
4...Variable aperture, 35...Power steering device, 36...
- Ura motor, 42...control device, 43...water temperature sensor.

Claims (3)

[Claims] (1) In a fluid device operating device that supplies fluid discharged from one pump driven by an automobile engine to first and second fluid devices having different operating pressure ranges and consumption flow ranges to operate them. , the pump is a constant discharge pump or a variable displacement pump, and the pump controls the fluid discharged from the pump to maintain a constant flow rate regardless of changes in rotational speed, and is equipped with an electromagnetic valve that can adjust the throttle opening to adjust the delivery flow rate as desired. A flow rate control means that can be adjusted is provided at the branch point of the fluid device supply path, and a flow divider with an electromagnetic valve that can adjust the throttle opening is provided at the branch point of the fluid device supply path, and each branch port is connected to the supply port of the first fluid device and the second fluid device. A plurality of fluids, characterized in that a solenoid valve control device is provided which connects the solenoid valves of the flow rate control means and the flow divider with solenoid valves in relation to each other in order to increase or decrease the supply flow rate of one fluid device. Equipment actuator. (2) The device according to claim 1, wherein the first fluid device is a hydraulic motor for driving a cooling fan, and the second fluid device is a power steering device. (3) The solenoid valve control device has a temperature sensor that detects the water temperature of the radiator, and when the water temperature is low, the control flow rate of the flow control valve is made equal to the supply flow rate of the power steering device, and the flow diverter is used to drive the cooling fan. 3. The apparatus according to claim 2, further comprising current control means for an electromagnetic valve that reduces the flow rate supplied to the hydraulic motor to almost zero and increases the flow rate of both the flow rate control valve and the flow diverter when the water temperature rises.