JPS5977131A - Electron oil pressure control device of hydraulic clutch - Google Patents

Abstract

PURPOSE:To obtain low operating oil pressure at low-speed rotation and high operating oil pressure at high-speed rotation by opening and closing a solenoid valve connected to an outlet of a low-pressure escape valve disposed in an oil pressure supply path to a switching valve of a clutch. CONSTITUTION:An electron controller 12 is adapted to send ON and OFF signals to a solenoid valve 7 corresponding to the rev count of an engine E, thereby opening and closing a valve sheet 7F. In the low rotating speed area of the engine E, the solenoid valve 7 is opened by the electron controller 12, so that oil pressure is kept low by a low-pressure escape valve 5, and in the high rotating speed area of the engine E, the solenoid valve 7 is closed, so that oil pressure flows only in a by-pass 11 with a throttle valve 10, thereby keeping oil pressure high. Between high operating oil pressure side and low operating oil pressure side, hysteresis has a width indicated by oblique lines in the moving area between UP and DOWN of rev count of the engine. The width of the hysteresis H can be freely controlled by the electron controller 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic hydraulic control device for a hydraulic clutch of a marine engine, etc., which is provided in a hydraulic pressure supply path to the hydraulic clutch.

In a ship, power is transmitted from the engine to the propeller by installing a hydraulic clutch in the deceleration gear transmission section provided in the power transmission path, and switching the hydraulic clutch to switch between forward and backward motion. The oil pressure supplied to the hydraulic clutch is set to the highest oil pressure required for power transmission, that is, to obtain the necessary transmission torque at high rotations and high loads, regardless of the engine speed.

Therefore, in the past, the oil pressure was unnecessarily high compared to the transmission torque at low rotation speeds and low loads, resulting in large horsepower loss and due to engine torque fluctuations at low speed rotations, the transmission gear This causes a rattling sound and an unpleasant noise.

Therefore, as a pressure adjustment device for the above-mentioned hydraulic clutch,
There is a need for a two-stage pressure regulating system that can provide a high working oil pressure when the engine rotates at high speed and a low working oil pressure when the engine rotates at low speed.

On the other hand, a pressure control valve that allows the flow of hydraulic oil only when the engine is running at low speeds is installed in the hydraulic system path of the hydraulic clutch to reduce the hydraulic pressure of the hydraulic oil applied to the hydraulic clutch when the engine is at low speeds. Japanese Patent Laid-Open No. 56-97629 discloses a hydraulic control device for a hydraulic multi-disc clutch as described above, but in this case, two-stage pressure regulation is not possible and the structure thereof is complicated.

In order to make it possible to adjust the pressure in one level, high or low, in response to the transmission torque of the hydraulic clutch, a pressure regulating piston and an intermediate piston were fitted from the front inside the cylinder, which had one drain hole formed on the side. Japanese Utility Model Application No. 55-57520 has also been proposed regarding a pressure regulating device for a hydraulic clutch, but in this case, there is only one drain hole, and there is a problem that the movement from high pressure to low pressure is not smooth.

Furthermore, a device was proposed in Japanese Utility Model Application No. 55-54621 in which a pressure regulating valve for low pressure and a pressure regulating valve for high pressure were installed in the pressure supply path leading to the hydraulic clutch, but the pressure regulating valves for low pressure and high pressure were each separate. Therefore, there are difficulties in terms of space and cost.

Therefore, the present invention solves the above-mentioned conventional problems, and enables automatic two-stage pressure regulation in which a low working oil pressure is obtained during low-speed rotation and a high working oil pressure during high-speed rotation, and the rotational speed changes from low pressure to high pressure. The purpose of this invention is to eliminate rattling noise and gear noise by providing an electronic hydraulic control device for a hydraulic clutch that can freely control the range of the hydraulic clutch.

That is, the electronic hydraulic control device for the hydraulic clutch of the present invention has the following features:
A low pressure regulating valve is provided in the hydraulic pressure supply path that sends the hydraulic pressure supplied from the hydraulic pump driven by the engine to the switching valve of the hydraulic clutch, and a solenoid valve is provided at the outlet of the low pressure regulating valve. It is constructed by providing an electronic controller that can open and close the valve according to the rotational speed of the engine.

The present invention will be described in detail below with reference to the drawings, in which the same parts are designated by the same part numbers in each embodiment.

First, FIG. 1 is an overall system diagram of a hydraulic control system in Embodiment 1 of the present invention. In FIG. 1, 1 is a hydraulic pump driven by an engine indicated by E, 2 is a forward/reverse switching valve, 6A is a hydraulic cylinder for forward movement, and 6B is a hydraulic pressure cylinder for reverse movement. It is designed to be sent to either 3A or 3B.

5 is the hydraulic pump 1 and the hydraulic cylinder 3A.

This is a low pressure regulating valve disposed in the middle of the hydraulic pressure supply path 6 leading to 6B, and a conventionally commonly used solenoid valve 7 is provided at the outlet of this low pressure side pressure regulating valve 5.
! 1 is provided with a secondary pressure regulating valve 8, and the hydraulic oil leaked via the low pressure regulating valve 5 and the solenoid valve 7 is secondarily pressure regulated by the secondary pressure regulating valve 8 and flows to each lubricating part of the engine E. A safety valve 9 is disposed in this hydraulic pressure supply path 6, and an outlet of the safety valve 9 is also communicated with an outlet of the electromagnetic valve 7.

In the first embodiment, a bypass passage 1 with a throttle valve 10 interposed is provided before and after the solenoid valve 7 provided on the outlet side of the low pressure regulating valve 5.
1 is provided, but this is because the amount of hydraulic oil when the solenoid valve 7 is released may be throttled by the solenoid valve 7, and in that case, the pressure regulation level by the low pressure regulating valve 5 will increase and be replaced. So,
This was provided to prevent this.

Next, the above-mentioned solenoid valve 7 is of a conventionally commonly used type, and communication between the inflow lower A and the outflow lower B is provided at the lower part of the movable iron core 7E that can move up and down within the coil 7D. The valve seat 7F is used for opening and closing operations.

Further, an electronic controller 12 shown in a broken frame in FIG. 1 is provided for opening and closing the solenoid valve 7. It sends ON and OFF signals to the movable iron core 7E and opens and closes the valve seat 7F.

In the electronic hydraulic control device of the present invention having the above configuration,
Oil pressure (Kf/crr!) and engine speed (r
pm), the solenoid valve 7 is opened by the electronic controller 12 in the low rotational speed range of the engine E, and the oil pressure is maintained at a low pressure by the low pressure regulating valve 5.
In the high rotation speed range of the engine E, the solenoid valve 7 is closed and the oil pressure flows only through the bypass path 11 equipped with the throttle valve 1U, so that the oil pressure is maintained at a high pressure.

That is, in the electronic hydraulic control device of the present invention, a low working oil pressure can be obtained in a low engine speed range, and a high working oil pressure can be obtained in a high engine speed range, especially on the high working oil pressure side. Engine speed UP and DOW between
It has a hysteresis width shown by the slope aH of the movement range with respect to N, and the width of the hysteresis H can be freely controlled by this 'weight controller 12.

In addition, this electronic controller 12 has a relay 12A, an I/Q port 12B, a RAM, and an RO as shown in FIG.
M, consists of a timer 1201 and a waveform shaper 12D connected to the CPU, and further connected to the rotation sensor 16 of the engine E.

In addition, in the diagram showing the relationship between engine speed (rpm) and noise level (dBA) in Figure 3, in the hydraulic clutch to which the electronic hydraulic control device of the present invention is applied, the actual
As shown by A, the noise level is below the target value of curve mT, and compared to the conventional pressure regulating hydraulic clutch shown by broken line B, the noise level is significantly improved, especially in the low engine speed range. This has been confirmed by experimental results.

Next, FIG. 4 shows a second embodiment of the present invention, which has almost the same configuration and function as the first embodiment shown in FIG. By providing a notch hole 7C in the partition wall between A and the outflow lower B, the first
By omitting the bypass path 11 shown in the figure, the cost is reduced and the device is made more compact and simple.

Therefore, in the second embodiment, when the oil pressure is low, the solenoid valve 7 is open, and the hydraulic oil flows from both the passage of the solenoid valve 7 and this notch hole 7C, and the pressure is regulated to a low pressure by the low pressure regulating valve 5. However, in this case, in order to prevent the flow from the notch hole 7C from interfering with the flow from the path of the solenoid valve 70 and increasing the pressure on the inlet side of the solenoid valve 7, the passage of the solenoid valve 7 is A notch 7G is formed on the outlet side to have a shape different from that of Embodiment 1 in FIG. 1 to smooth the flow.

Next, when moving to the high oil pressure side, the passage of the electromagnetic valve 7 is closed, and the notch hole 7C restricts the pressure to a high oil pressure.

Therefore, by applying the present invention, it is possible to freely control a two-stage hydraulic pressure curve in which a low working pressure is obtained when the pressure is low and a high working pressure is obtained when the rotation is high, and rattle noise can be reduced. It is possible to reduce the noise caused by the hydraulic pump operated by the engine.

Still, it has the effect of eliminating the shock when the hydraulic clutch is engaged.

The present invention can be effectively applied to a wide range of models as a pressure control device for hydraulic clutches in general.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram of an electronic hydraulic control device for a hydraulic clutch in Embodiment 1 of the present invention, and FIG. 2 is a diagram showing the relationship between oil pressure and engine rotation speed in the electronic hydraulic control device of FIG. 1. FIG. 3 is a diagram showing the relationship between engine speed and noise level in the electronic hydraulic control device of FIG. 1 and the conventional hydraulic control device, and FIG. 4 is a diagram showing the electronic hydraulic pressure of the hydraulic clutch in Example 2 of the present invention. FIG. 2 is an overall system diagram of the control device. 1...Hydraulic pump, 2...Switching valve, 5A + 5B
... Hydraulic cylinder, 5... Low pressure regulating valve, 6... Hydraulic pressure supply path, 7... Solenoid valve, 12... Electronic controller, 13... Rotation sensor, E... Engine. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] A low pressure regulating valve is provided in the hydraulic pressure supply path that sends the hydraulic pressure supplied from the hydraulic pump driven by the engine to the switching valve of the hydraulic clutch, and a solenoid valve is provided at the outlet of the low pressure regulating valve. An electronic hydraulic control device for a hydraulic clutch, comprising an electronic controller that can open and close a valve according to the rotational speed of the engine.