JPS59190519A - Device for preventing hydraulic clutch from shock in fitting - Google Patents

Abstract

PURPOSE:To prevent a hydraulic clutch from shock in fitting by regulating work ing oil pressure automatically on the basis of the signal from an oil pressure detector in fitting the hydraulic clutch. CONSTITUTION:Working oil sucked from an oil pan 1 by a gear pump 2 is introduced from an oil supply path 6 into a pressure regulating valve 6 to be regulated with respect to its pressure, and then introduced into an advancing cylinder 10 or a retreating cylinder 11 of a hydraulic clutch respectively through an advancing change-over valve 8 or a retreating one 9 from an oil supply path 7 after regulating pressure. On a servo valve 17 of a drive device 13 for the pressure regulating valve 6 is mounted a detecting guide pin 20 which moves integrally with the servo valve 17 and the position of which is measured by a potentiometer 21 to form thereby an oil pressure detector 22.

Description

[Detailed description of the invention] It's about location.

In hydraulic clutches for forward/reverse switching in marine engines, etc., as a method to prevent the shock that occurs when the hydraulic clutch is engaged, a slow-fitting valve that applies a conventional pressure regulating valve structure is used.・There is a problem that when the hydraulic circuit is opened to the reverse cylinder, the pressure is low and it takes too much time to insert it.

In addition, a method of preventing shock at the time of insertion is also used by performing insertion by trolling, but in this case as well, there is the problem that the insertion time is too long as in 1). , plus l- 0-! The drawback is that it is cumbersome to operate the lever manually when placing the J-song.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and utilizes a pressure regulating valve for trolling, and prevents the hydraulic clutch from being jammed when engaged. The purpose is to shorten the fitting time.

That is, the hydraulic clutch insertion shock prevention device of the present invention includes a latch hydraulic direction switching device that can electrically switch the hydraulic clutch for switching engine forward and reverse movement, a pressure regulating valve that can adjust the working oil pressure to an arbitrary pressure, This system is characterized by being composed of an oil pressure detector and a control device.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a hydraulic oil circuit for forward/reverse switching of a hydraulic clutch of a marine engine according to a first embodiment of the present invention.

The hydraulic clutch shown in FIG. 1 sucks hydraulic oil from an oil pan 1 of a marine engine (not shown) into a gear pump 2, and... The pressure-regulated hydraulic oil is introduced into the pressure regulating valve 6 that operates in the pressure increasing direction ((2) or the pressure decreasing direction indicated by the arrow), and the regulated hydraulic oil is passed from the port 16 via the oil supply path 7 to either the forward switching valve 8 or the shunting/reverse switching valve 9. The hydraulic clutches are introduced into the forward cylinder 10 or the reverse cylinder 11 of the hydraulic clutch, respectively, to operate the respective hydraulic clutches.

Next, the clutch hydraulic direction switching device 12, which is surrounded by a dashed line and consists of the forward switching valve 8 and the reverse switching valve 9, includes:
A pilot valve 18 that can be electrically switched is provided, and by moving this pilot valve 18 in the forward direction of arrow F or the backward direction of arrow R, the hydraulic oil from the oil supply path 5 is transferred to this direction according to its position. By pressing the valve end of either the forward switching valve 8 or the reverse switching valve 9 through the pilot valve 18 against the spring force of the spring 19 provided in each, the forward switching valve 8 or the reverse switching valve 9, and as a result, the direction in which the clutch hydraulic oil flows is changed to the forward cylinder 10,
Alternatively, the reverse cylinder 11 can be switched in each direction.

However, the pressure regulating valve 6 is activated by increasing the pressure I, t or decreasing the pressure R in the axial direction of the built-in servo valve 17.
Pressure-regulated hydraulic oil is supplied to 6, and 17A in the figure is a servo valve stopper.

On the other hand, a drive device 16 surrounded by a dashed line is a DC motor 14.
The power is transmitted to the servo valve 17 by the motor output shaft 15, and the hydraulic pressure of the hydraulic oil from the gear pump 2 can be adjusted to a desired pressure via the pressure regulating valve 6. It makes it possible.

Next, a detection guide pin 20 is attached to the servo valve 17 of this drive device 16, and its position is measured by a potentiometer 21 as it moves together with the servo valve 17. Four oil pressure detectors 22 are constructed by one point g1 line.

Here, there is a unique relationship between the reading of the potentiometer 21 and the hydraulic pressure P of the hydraulic oil regulated at the port 16, as shown in the diagram shown in FIG.
The pressure P can be detected by reading .

Next, the operation and control of the hydraulic clutch having the above configuration will be described with reference to the block diagram of FIG. 3 showing the control device 24 and the flowchart of control by the control device 24 of FIG. 4.

When the hydraulic clutch is in neutral state, no pressure is supplied to the forward cylinder 10 and the reverse cylinder 11, and the hydraulic pressure regulated at the port 16 is supplied to the forward switching valve 8 and the reverse cylinder. At this time, the pressure regulating valve 6 maintains the high pressure P1 with the servo valve 17 pushed out.

This high pressure P1 is a predetermined pressure, and the output of the potentiometer 21 is converted to N by converter 25 in Figure 3.
The converted value is stored in the storage device 26 in the control device 24.

In addition, the arithmetic unit 29 in the control device 24 controls the relays (1) 27 and (2) so that the stored values are the same in the neutral state.
The pressure regulating valve 6 is controlled via 28.

Next, at the time of fitting, when the shift latch position changeover switch 60 is manually inputted to the control device 24 for fitting the forward cylinder 10 and the reverse cylinder 11, the following operations are performed.

That is, the control device 24 operates the clutch hydraulic direction switching device 12 in the forward direction F1 or in the reverse direction R, which has received the input, and then waits for a preset waiting time T2 depending on the rotation speed of the marine engine. The pressure regulating valve 6 is operated via the relay (2) 28, and this is also lowered to a preset low pressure P2 while reading the output of the potentiometer 21.

Note that the above waiting time T2 does not delay the insertion time T1,
In addition, in the case of a marine engine, for example, the optimal time without impact shock can be obtained depending on the rotational speed of the engine so that the startup of the propeller rotation is smooth.

Next, after waiting for a preset waiting time T3, the pressure regulating valve 6 is operated via the relay (1)' 27, and the hydraulic pressure is increased to the high pressure P1 while being compared with the output of the potentiometer 21.

Note that the waiting time T3 is a value that optimizes the start-up nine hours T4, and like the waiting time T2, this value is also obtained in advance from the engine rotation speed.

Unfortunately, as shown in the upper part of Fig. 5, when hydraulic control is not performed, the start-up time is T4/2, and the start-up time 9 is fast, so the shock at the time of insertion becomes large. When the hydraulic pressure is adjusted by the control device 24 as shown in FIG.

Next, Fig. 6 is a two-row chart of the control in the control device of the hydraulic clutch insertion shock prevention device in Embodiment 2 of the present invention, and Fig. 7 is a time chart of the control. The shell 2 has almost the same structure and function as the first embodiment, and the control device 24 shown in the hydraulic clutch hydraulic path diagram in FIG. 1 and the block diagram in FIG. 3 is applied. The same parts as in Example 1 will be described using the same part numbers.

The operation and control of the hydraulic clutch in the neutral state of the second embodiment are also similar to those in the second embodiment, but the operation and control when the forward cylinder 10 and the reverse cylinder 11 are engaged will be described below.

First, at the time of fitting, when an input to fit the shift latch position changeover switch 60 into the forward cylinder 10 or reverse cylinder 11 side is entered into the control device 24, the following operation is performed.

First, the control device 24 operates the clutch hydraulic direction switching device 12 in the forward direction F1 or the reverse direction R where the input is applied.
Then, the rotational speed of this marine engine is checked, and only if it is in a low rotational speed range where a rattling noise is produced, the operation moves to the time chart shown in FIG.

That is, the pressure regulating valve 6 is operated via the relay (2) 28 after waiting for a waiting time T2 which is preset and memorized depending on the engine rotation speed, and the potentiometer 21 is adjusted to a low pressure P2 which is also preset and memorized. Immediately lower the oil pressure while comparing the output.

Note that the waiting time T2 does not delay the insertion time T1;
In addition, the optimal value that does not generate rattling noise is the one obtained by the engine rotation speed of 3 degrees, and the low pressure P3 is
This is the pressure that must be lowered in order to avoid rattling noise, and this is also obtained in advance by the clutch.

Note that while the input to the clutch position changeover switch 3o remains at 1, the control device 24 controls to maintain the low pressure of P3 to prevent rattling noise from occurring. (On the other hand, when an operation to return to neutral is input, the control device 24 operates the clutch hydraulic direction switching device 12 to neutral, and immediately changes the pressure regulating valve 6 to the high pressure PI in the neutral state via the relay (1) 27. Return it and prepare for the next action.

Therefore, the hydraulic clutch insertion shock prevention device of the present invention solves the problems of the conventional devices in which a shock occurs when the clutch is inserted without a smooth insertion valve, and that the insertion time becomes longer when a gradual insertion valve is installed. This can improve the feeling of maneuvering and the comfort of the ship.

In addition, the actual operation of the hydraulic clutch by a person is completely unchanged from conventional methods, and the operability is not compromised.The entire device can be electrically controlled, making remote control easy and improving workability. It also has the advantage of leading to improvement.

Furthermore, the present invention can be effectively applied as a measure to prevent rattling noise that occurs when the clutch is engaged at low speed.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the hydraulic oil circuit of a hydraulic clutch of a marine engine according to Embodiment 1 of the present invention, and Fig. 2 is a diagram showing the relationship between the pressure regulating characteristics of the pressure regulating valve of Fig. 1 and the reading of the potentiometer. , FIG. 3 shows tlj! which controls the hydraulic clutch shown in FIG. 1.
A block diagram of the I control device, FIG. 71 is a flowchart of the control device of FIG. 3, FIG. 5 is a time chart of the 'A5I'J control device of FIG. Flowchart 1 of the control device for the clutch insertion shock prevention J1 device is shown in 9, and FIG. 7 shows the time chart 1 of the control device shown in FIG. 6. 1...Pressure adjustment valve, 8...Forward switching valve, 9...
Reverse switching valve, 'I2...Clutch hydraulic direction switching device, 16...Drive device, Fu4...DCC morph 15.
... Motor output shaft, 17 ... Servo valve, 18 ... Pilot valve, 21 ... Buttonyometer, 22 ...
Oil pressure detector, 24...! I control device, 25...A,
/D conversion J? j, 26...Storage device, 27...Relay (1), 28...Relay (2), 29...Arithmetic unit, 30...Kurasoji position changeover switch, T2゜T3
...Waiting time, P''...High pressure, P2. P3...Low pressure.

Claims (1)

[Claims] The hydraulic clutch for engine forward/reverse switching is comprised of an electrically switchable latch hydraulic direction switching device, a pressure regulating valve that can adjust the working oil pressure to any pressure, an oil pressure detector, and a control device. Hydraulic clutch intrusion shock prevention device.