JPS60146799A - Hydraulic steering system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to hydraulic steering systems.

Hydraulic drive systems for steering blades and the like that control the attitude and motion trajectory of flying objects, etc., have conventionally been powered by electric motors, as shown in the system diagram of FIG. 1, for example.

Variable discharge pump2. Reservoir 3. Relief valve 4, filter 5. Pressure gauge6. Accumulator 7, steering actuator 8. Steering control device 9, flight control device IO2 power supply 11
It is composed of

In such a hydraulic steering system, the electric motor is operated by electric power supplied from a power source 11 and transmits driving force in one direction and at a substantially constant rotational speed to the variable discharge pump 2, and the variable discharge pump is operated from the reservoir 3. It sucks in oil, compensates for variations in load flow rate using a built-in pressure adjustment mechanism, and discharges hydraulic oil at a constant pressure.The discharged hydraulic oil passes through a filter 5, operates a steering actuator 8, and then enters a reservoir 3. Return to

Here, accumulator 7 is the steering actuator.

As long as the consumption amount of Yueta 8 is within the capacity of the variable discharge pump, hydraulic oil is stored and the consumption flow rate changes.

If the capacity of the discharge pump is exceeded, hydraulic oil is released by -5 to prevent an extreme drop in system pressure, and the relief valve 4 detects an abnormal increase in system pressure and releases hydraulic oil until the pressure drops to normal. The pressure detector 6 indicates the value of the system pressure, and the flight control device IO transmits a signal for controlling the attitude of the flying object etc. to the steering control device 9, and the steering control device 9 receives this signal. It compares/presents the steering angle signal with the steering actuator 8 and transmits it to the steering actuator 8 to operate it.

However, such conventional steering hydraulic systems have the following drawbacks.

+11 Even in a state where the consumption flow rate of the steering actuator is small, that is, a state that occupies most of the operation, the electric motor and the variable discharge pump rotate at high speed and the energy loss is large.

(2) The pressure control mechanism of the variable discharge pump is complex, making it expensive and reducing reliability.

(8) Since the crystal pressure cannot be changed during operation, the flexibility of the control system is limited.

(4) A large-capacity accumulator is required to fill the gap between the peak flow rate of the steering actuator and the capacity of the variable discharge pump (usually set based on the normally used flow rate).

Electric motors and variable displacement pumps always operate at high speeds and therefore have relatively short wear lives.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide a hydraulic steering system that is inexpensive, has little energy loss, is compact, and has high flexibility and reliability.

To this end, the present invention controls the steering angle through an actuator inserted into the circulation circuit for the discharged oil of an oil pump driven by an electric motor, and when a command signal from a flight control device is input to the actuator, N is also controlled. In a hydraulic steering system that can be controlled by a steering control device that inputs an actual steering angle signal and outputs its deviation, a constant discharge oil pump driven by a reversible variable rotation speed motor;
A pressure control signal from the flight control device, a steering command signal from the steering control device, and a discharge oil pressure signal from the constant discharge oil pump are manually input to control the rotation speed and rotation direction of the reversible variable rotation speed motor. It is characterized by being equipped with a pump control device.

An embodiment of the present invention applied to an aircraft will be explained with reference to the drawings, and FIG. 2 is a system diagram thereof.

In the above diagram, the same symbols as in Figure 1 indicate A1, the same equipment as in the same diagram. It is a motor that can be controlled in number, and has a constant discharge pump 2.
It is mechanically connected to a.

Constant discharge 1'' 2 A is a gear pump (・ha,
A hydraulic pump with a simple structure such as an axial piston pump with a fixed swash plate.It is driven by an electric motor LA, sucks hydraulic oil stored in the reservoir 3, and discharges hydraulic oil in a volume proportional to the rotation speed to the hydraulic system. However, this hydraulic fluid passes through the filter 5, operates the steering actuator 8, and then returns to the reservoir 3.

IJ IJ-) Valve 4 detects an abnormality in system pressure and releases hydraulic fluid to a reservoir to protect the hydraulic system.

The flight control device 10 monitors the state of motion of the flying object, etc., and transmits a command signal optimal for the state to the steering control device 9 and the pump control device 124c.

The steering control device 9 compares/calculates the command signal 16 of the flight control device IO and the steering angle signal 13 from the steering actuator 8, and transmits the result to the steering actuator 8 and the pump control device 2.

The pump control device 12 includes a flight control device 10° and a steering control device 9. The signals from the pressure detector 6 are added, and based on this, the power supplied from the power supply 11 to the electric motor la is controlled.
Ru.

In such a steering system, the pump control device 12
The constant discharge pump 2a whose output is controlled by the reservoir 8
The hydraulic oil supplied thereto is sucked in and discharged. This hydraulic oil passes through the filter 5 and is sent to the steering actuator 8.

If the steering actuator 8 is stopped, it is sent here. There is only a slight leakage of hydraulic oil in the steering actuator 8 (from a servo valve, etc.), and the constant discharge pump 2a compensates for this leakage and discharges the hydraulic oil necessary to keep the pressure of the hydraulic system constant.

When the flight control device IO transmits a command signal 16 to the steering control device 9, the steering control device 9 processes this and sends a control signal 14.
and 15 are output.

The control signal 14 actuates the steering actuator 8, and at the same time the control signal 15 causes the pump control device 12 to actuate the control signal 2.
As a result, the rotational speed of the shearing motor 1 increases, and the discharge amount of the constant discharge pump 2a increases to compensate for the amount of hydraulic oil consumed due to the operation of the steering actuator 8.

At this time, the accumulator 7 compensates for a temporary shortage of hydraulic oil due to a time lag until the discharge amount of the constant discharge pump 2a increases, thereby minimizing pressure fluctuations in the hydraulic system.

When the flight control device IO transmits the pressure control signal 17 to the pump control device 12, the signal 19 from the pressure detector 6 is transmitted.
A control signal 2o proportional to this amount is generated, which activates the electric motor la to drive the pump 2a and push out hydraulic fluid to the hydraulic system.

Then, the system pressure is the signal 19 of the pressure detector 6.
is fed back to the pump control device 12,
When the difference with the pressure control signal 17 reaches within a predetermined value, the control signal 2o disappears by 1.

If the pressure of the hydraulic system deviates from a predetermined value due to load fluctuations or leakage, the pump control device 12 receives the signal 19 from the pressure detector 6 and controls the electric motor la in the direction in which the system pressure returns to the predetermined value. The direction of rotation is controlled and the system pressure corresponding to the pressure control signal 17 of the flight control device IO is always maintained.

According to such a steering system, the following effects are diminished.

+1+ Since only the minimum necessary power is consumed in response to fluctuations in the steering load, energy sources such as batteries for aircraft/flying objects can be downsized.

f2) 'it = dynamic Morse pump rotates at high speed and under high load only when necessary, so it is possible to increase the rating and downsize, and conversely, if the rating is the same, the life can be extended.

(3) Is it possible to construct a load-adaptive hydraulic system using a constant discharge pump that is structurally inexpensive?

(4) Since an accumulator of small Wj and ft is sufficient, the system can be downsized.

(5) The system can be operated at a pressure that minimizes energy consumption depending on the flight mode.

(6) By changing the pressure during flight, the gain of the steering system can be optimized.

(7) The present invention applies not only to aircraft but also torpedoes and torpedoes.

It can also be applied to the steering of space equipment and other transportation equipment.

In short, according to the present invention, the steering angle is controlled via an actuator inserted into the circulation circuit for the discharged oil of an oil pump driven by an electric motor, and a command signal from the flight control device is input to the actuator. Then, in a hydraulic steering system in which an actual steering angle signal of the steering angle is inputted to N and the deviation thereof is controlled by a steering control device, a constant discharge oil pump driven by a reversible variable rotation speed motor and a ,
A pressure control signal from the flight control device, a steering command signal from the steering control device, and a discharge oil pressure signal from the constant discharge oil pump are input to control the rotation speed and rotation direction of the reversible variable rotation speed motor. - By being equipped with a pump control device, a hydraulic steering system with even higher performance can be obtained.
The present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a known hydraulic steering system for an aircraft, and FIG. 2 is a system diagram showing an example in which a known aircraft hydraulic steering system is applied to an aircraft. la... electric motor, 2a... constant discharge pump, 3.
... Reservoir, 4... Relief valve, 5... Filter, 6... Pressure detector, 7... Accumulator, 8...
...Actuator, 9...Steering control device, lO...
・Flight control device, 11...Power source, 12...Bump control device, 13...Rudder angle signal, 14.15...Control signal, 16...Command signal, 17...Pressure valve] ft+IJ Control signal, 19... Signal, 20... City control signal Sub-agent Patent attorney Masafumi Tsukamoto

Claims (1)

[Claims] The rudder angle is controlled via an actuator inserted into the circulation circuit for the discharge oil of an oil pump driven by an electric motor, and when a command signal from the flight control device is input to the actuator, an actual rudder angle signal of the rudder angle is generated. In a hydraulic steering system, the hydraulic steering system is controlled by a steering control device that inputs a value and outputs the deviation thereof, and includes a constant discharge oil pump driven by a reversible variable rotation speed motor, a pressure control signal from the flight control device, and the steering control device. and a pump control device that inputs a steering command signal from a control device and a discharge oil pressure signal of the constant discharge oil pump to control the rotation speed and rotation direction of the reversing variable rotation speed motor. 1- Hydraulic steering system.