JPH0730480Y2 - Operating mechanism of marine transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to an operating mechanism for a marine transmission, which is attached to the rear of a marine engine to reduce the rotational speed of the engine and to switch between forward and reverse gears. It is a thing.

(B) Prior Art In the conventional marine transmission operating mechanism, as shown in the conventional hydraulic circuit diagram of FIG.
When switching between forward / reverse hydraulic clutch switching and neutral is selected, and when the vehicle is in the forward / reverse operating state, pressure oil from the hydraulic pump is guided through the throttle 28 to the spring receiving piston pressure receiving chamber of the primary pressure regulating valve. The pressure oil of the hydraulic pump was gradually increased to loosely fit the hydraulic clutch.

(C) Problems to be solved by the invention However, in the conventional technology, when the hull becomes large, it becomes a problem that it can be operated only by the manual switching valve, and it is desired that remote control operation can be performed in a place other than the cab. is there.

Under such circumstances, the push-pull cable from the conventional manual switching valve remote control box is connected to the operating lever, but with such an operating mechanism, the operating force of the manual switching valve is heavy and However, there was a problem that the switching operation could not be performed reliably due to the frictional resistance.

On the other hand, it is possible to simply switch the manual switching valve to a solenoid valve, but in addition to the normal switching oil passage, the switching valve equipped with a pressure oil introduction port to the primary pressure regulating valve is a special switching valve. In addition, the pressure oil introduction path to this primary pressure regulating valve must have a large oil passage diameter in order to allow the pressure oil after passing through the throttle to flow in. There is a problem that the cost becomes high when it is manufactured.

The present invention solves the above problems.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

By sliding the main switching valve spool 1, the main switching valve V that switches the pressure oil from the hydraulic pump 6 to the forward hydraulic clutch 11, the neutral position, and the position to be the reverse hydraulic clutch 12 is moved from the hydraulic pump 6. Pressure oil is switched by the solenoid valve 2 and supplied to the cylinder chambers 37, 38 on both sides of the main switching valve spool 1, and is constituted by a hydraulic pilot type switching valve that slides on the main switching valve spool 1. To the solenoid valve 2 and at the solenoid valve 2, either the cylinder chamber 37, 38 on both sides of the main switching valve spool 1 or the cylinder chamber of the main switching valve V after switching to the neutral position.
The side from the hydraulic pump 6 to the main switching valve V in order to make the pressure of the hydraulic oil reaching 37, 38 higher than the initial oil pressure of the hydraulic oil that passes through the main switching valve V from the hydraulic pump 6 and reaches the hydraulic clutch. The resistance valve 5 is provided in the circuit of FIG.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a hydraulic circuit diagram of an operating mechanism of a marine transmission of the present invention,
2 is a front sectional view of the solenoid valve 2 and the main switching valve V, and FIG. 3 is a sectional view of the primary pressure regulating valve 3 and the resistance valve 5.
FIG. 4 is a hydraulic circuit diagram of a conventional operating mechanism for a marine transmission.

The overall configuration will be described with reference to FIG. 1, which is the configuration of the present invention.

The hydraulic oil is pressurized and discharged from the hydraulic pump 6. The hydraulic pump 6 is fixed to the portion of the marine engine, and two oil feed pipes 23 and 25 are extended from the hydraulic pump 6.

As shown in FIG. 3, the oil feed pipe 23 is connected to the valve case 24 to feed pressure oil to the resistance valve 5 and the safety valve 13. Then, in an emergency, the safety valve 13 is opened and the pressure oil is jetted to the tank port.

Further, the pressure oil sent from the oil sending pipe 23 and passing through the resistance valve 5 in the valve case 24 is branched, one of which passes through the trolling valve 4 through the oil passage 29 and the main valve of FIG. 2 through the oil passage Pc. It communicates with the lower oil passage of the case 9.

The trolling valve 4 is a pressure reducing valve, which further reduces the hydraulic pressure set by the primary pressure regulating valve 3 and causes the forward hydraulic clutch 11 or the reverse hydraulic clutch 12 to slip to a half-clutch state to maintain a slow speed during trolling fishing. This is the valve used to obtain the desired value.

The other pressure oil branched after passing through the resistance valve 5 reaches the primary pressure regulating valve 3 and resists the biasing spring 30 to move the primary pressure regulating valve 3 to the second pressure regulating valve 3.
Push toward the left side of the figure.

In addition, the pressure oil from the hydraulic pump 6 is fed by the oil feed pipe 25,
The spring receiving piston 33, which is supplied to the strainer 20 of the main valve case 9, passes through the throttle 28, and passes through the main switching valve V, is pressed by the biasing spring 31 by the oil supply pipe 22. Since the oil is being sent to the back chamber of the device, the urging force of the urging springs 30 and 31 is changed by the movement of the spring receiving piston 33, and the primary pressure regulating valve 3 is pressed and urged.

The pressure oil passing through the portion of the primary pressure regulating valve 3 against the urging force of the urging springs 30 and 31 passes through the oil cooler 19 and the strainer.
After passing through 18, the pressure is reduced to a low pressure by the secondary pressure regulating valve 17, and low pressure oil is sent to the lubrication parts 16 of the respective parts.

The pressure oil fed from the hydraulic pump 6 to the main valve case 9 by the oil feeding pipe 25 shown in FIG. 2 is branched to the portion of the throttle 28 of the P port main switching valve V of the solenoid valve 2 via the strainer 20. Is there.

The pressure oil that has passed through the throttle 28 is sent to the oil transfer pipe when the main switching valve V is switched to a position for sending the pressure oil to the forward hydraulic clutch 11 or the reverse hydraulic clutch 12 of the main switching valve V.
From 22 to the back chamber of the spring receiving piston 33, the bias springs 30 and 31
Press to gradually close the open primary pressure regulating valve 3,
The oil pressure sent from the trolling valve 4 to the oil passage Pc of the main switching valve V is configured to be gradually increased.

The structure of the throttle 28 and the primary pressure regulating valve 3 relieves the sudden hydraulic shock clutch engagement at the initial stage of the forward hydraulic clutch 11 engagement.

That is, in FIG. 2, the pressure oil that has passed through the throttle 28 is switched by the main switching spool 1 to reach the oil feed pipe 22, and the oil feed pipe 22 is, as described above, the valve case 24 of FIG.
At, the oil is fed to the back chamber of the spring receiving piston 33 of the biasing springs 30 and 31 for pushing the primary pressure regulating valve 3.

Further, the pressure oil that is switched into the forward hydraulic clutch 11 and the safety valve 13 and flows in passes through the resistance valve 5 and the trolling valve 4, and the pressure oil that has passed through the oil passage Pc is sent.

In the present invention, the solenoid valve 2 can be operated by a remote controller without providing a manual switching valve 21 as in the prior art. However, in order to use the solenoid valve 2 as a general-purpose mass-produced product, The main switching valve V cannot be directly used as a solenoid valve, and the solenoid valve 2 is used as a valve for operating the main switching valve V configured as a hydraulic pilot type switching valve.

The pressure oil switched by the solenoid valve 2 and passing through the oil passages 35, 36 flows into the cylinder chambers 37, 38 at the left and right ends for operating the main switching valve spool 1.

Then, the main switching valve spool 1 is pushed by the pressure oil flowing into one of the cylinder chambers 37, 38, and the pressure oil from the oil passage Pc is transferred to the forward hydraulic clutch 11 or the reverse hydraulic clutch.
It flows into 12.

In the present invention, the cylinder chamber of the main switching valve V is switched after being switched by the solenoid valve 2 so that the main switching valve spool 1 can be easily switched by the pressure oil switched by the small-sized solenoid valve 2 for mass production. The pressure of the pressure oil reaching 37, 38
After branching from the hydraulic pump 6 to both paths, the resistance valve 5 is inserted in the circuit on the main switching valve V side so that the initial hydraulic pressure of the hydraulic fluid passing through the main switching valve V and reaching the hydraulic clutch is higher. I dressed. That is, the resistance valve 5 whose initial hydraulic pressure is set higher than the initial hydraulic pressure of the primary pressure regulating valve 3
Is interposed between the hydraulic pump 6 and the main switching valve V.

The pressure of the pressure oil reaching the primary regulating valve 3 and the trolling valve 4 decreases by that amount, but this is a pressure drop that does not impair the function of the entire device.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

First, the main switching valve V, which requires a special configuration, cannot be configured as a solenoid valve, but since the solenoid valve 2 that hydraulically switches the main switching valve V is arranged, the solenoid valve 2 is By operating the remote control, the operation mechanism of the marine transmission could be changed to the remote control type.

Secondly, since the solenoid valve 2 can be used as a mass-produced general-purpose commercial product, it is possible to suppress an increase in cost required for remote control.

Thirdly, by making the pressure oil pressure on the solenoid valve 2 side larger than the initial oil pressure on the hydraulic clutch side by the resistance valve 5, the solenoid valve 2 can operate the main switching valve spool 1. The pressure can be obtained, the solenoid valve 2 can be used as a mass-produced commercial product, and the main switching valve V itself can be made compact by using the main switching valve spool 1 having a small diameter.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of an operating mechanism of a marine transmission of the present invention,
2 is a front sectional view of the solenoid valve 2 and the main switching valve V, and FIG. 3 is a sectional view of the primary pressure regulating valve 3 and the resistance valve 5.
FIG. 4 is a hydraulic circuit diagram of a conventional operating mechanism for a marine transmission. V ... Main switching valve 1 ... Main switching valve spool 2 ... Solenoid valve 3 ... Primary pressure regulating valve 4 ... Trolling valve 5 ... Resistance valve 6 ... Hydraulic pump

Claims (1)

[Scope of utility model registration request] 1. A main switching valve spool 1 is slid so that pressure oil from a hydraulic pump 6 is transferred to a forward hydraulic clutch 11.
Then, the main switching valve V for switching between the neutral position and the position for setting the reverse hydraulic clutch 12 is switched to the cylinder chambers 37, 38 on both sides of the main switching valve spool 1 by switching the pressure oil from the hydraulic pump 6 by the solenoid valve 2. It is configured by a hydraulic pilot type switching valve that supplies and slides on the main switching valve spool 1. The hydraulic pump 6 leads to the solenoid valve 2, and the solenoid valve 2
After switching to either of the cylinder chambers 37, 38 on both sides of the main switching valve spool 1 or to the neutral position, the pressure of the pressure oil reaching the cylinder chambers 37, 38 of the main switching valve V is changed to the hydraulic pump 6.
From the hydraulic pump 6 to the main switching valve V, the resistance valve 5 is interposed in the circuit on the side from the hydraulic pump 6 to the main switching valve V so as to be higher than the initial hydraulic pressure of the hydraulic oil passing through the main switching valve V to the hydraulic clutch. Operating mechanism for marine transmission.