JPH074345Y2 - Clutch hydraulic control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a clutch hydraulic control device used for a hydraulic clutch of a ship or the like.

[Prior Art] Generally, a clutch hydraulic control device used in a fishing boat or the like is
A low speed valve (trolling valve) is provided in the middle of the circuit connecting the oil pump and the clutch switching valve. This low-speed valve has a hydraulic pressure that allows the clutch to be fully connected (normally connected hydraulic pressure).
The hydraulic pressure that allows the clutch to be connected to a low pressure (half-clutch hydraulic pressure) can be set alternatively. In addition, such a low speed valve incorporates a hydraulic control valve mechanism controlled by a governor, and when the low speed valve or the switching valve is maintained at a constant position, even if the engine speed changes,
Upon receiving the control oil pressure from the governor, the control valve mechanism keeps the discharge pressure of the low speed valve constant.

[Problems to be Solved by the Invention] However, a so-called muffling device may be provided in the above device. This muffler is composed of a kind of pressure regulating valve and is for preventing gear rattling noise etc. from occurring in the gear mechanism connected to the clutch when the clutch is connected and the engine is operated at a low speed. Is.

More specifically, engine torque fluctuations are likely to occur during low-speed operation. Therefore, unless a silencer is provided, the hydraulic pressure supplied to the clutch is sufficiently high, so engine torque fluctuations (or rotational fluctuations) ) Is transmitted as it is, and as a result, the above-mentioned rattling noise occurs. The muffler is to prevent such problems, and is composed of a kind of pressure regulating valve, and has a function to adjust to a low hydraulic pressure so that the clutch connection becomes a half-clutch state in the low engine speed region. have.

In the structure proposed in the related art, the silencer (pressure regulating valve) is provided upstream of the low speed valve.
With this structure, the pressure regulator valve of the silencer is connected to the source pressure circuit to which the governor's hydraulic pressure supply circuit (hydraulic feed circuit) is connected. There arises a problem that a high hydraulic pressure (a hydraulic pressure sufficient to normally operate the governor) cannot be supplied.

In order to solve such a problem, it has been proposed to provide a valve mechanism for opening and closing the inlet circuit of the pressure regulating valve of the silencer with the low speed valve. With this structure, theoretically, the above-mentioned inconvenience can be solved, but in reality, since it is necessary to delicately set the opening / closing timing of the inlet circuit of the pressure regulating valve, an error may occur in the operation of the low speed valve, There is a problem that it becomes complicated.

The present invention seeks to provide a structure that solves the above-mentioned problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an oil pump for discharging hydraulic oil at a hydraulic pressure corresponding to the rotation speed of an engine or a clutch input shaft, and a hydraulic pressure supply to a hydraulic clutch. And a clutch switching valve that shuts off, a low pressure valve that can selectively set the hydraulic pressure that can completely connect the clutch and the hydraulic pressure that can completely connect the clutch, and a governor hydraulic pressure that corresponds to the change in the output shaft speed. A governor for operating and a hydraulic control valve mechanism that is installed together with the low pressure valve and is operated by the governor hydraulic pressure so as to maintain the outlet hydraulic pressure of the low pressure valve constant with respect to changes in the output shaft speed, and the outlet of the oil pump. To the inlet of the low pressure valve, the control pressure circuit to connect the outlet of the low pressure valve and the inlet of the clutch switching valve, and the inlet is connected to the source pressure circuit to set the oil pressure of the source pressure circuit to the set value. Do A clutch hydraulic pressure regulating valve is provided, and the clutch hydraulic pressure regulating valve is provided with an inlet connected to the source pressure circuit, an outlet connected to the low pressure portion via the low pressure circuit, and a setting hydraulic pressure inlet for setting the above set value. , A setting hydraulic pressure introducing circuit for introducing the outlet hydraulic pressure of the clutch switching valve to the setting hydraulic pressure inlet is provided, whereby the hydraulic pressure of the source pressure circuit is set according to the switching state of the clutch switching valve, A silencer circuit is connected to the low-pressure circuit, and a silencer pressure regulating valve that adjusts the oil pressure by discharging oil to the outlet is provided upstream of the silencer circuit, and a flow rate control valve is provided downstream of the silencer circuit. The control valve is configured to open only when the absolute value of the difference between the inlet oil pressure and the outlet oil pressure is equal to or less than a predetermined value.

[Embodiment] In FIG. 1, an inlet of an oil pump 1 is connected to an oil reservoir, and an outlet thereof is connected to an inlet 4 of a low speed valve 3 via a source pressure circuit 2. The outlet 5 of the low speed valve 3 is connected to the inlet 8 of the switching valve 7 via the control pressure circuit 6. Switch valve 7 is outlet 1
0, 11, 12 are provided, and the outlet 10 and the outlet 11 are connected to the hydraulic chambers of the reverse clutch 15 and the forward clutch 16 via clutch circuits 13 and 14, respectively.

The low-speed valve 3 itself has a known structure, and by moving the operating lever 20 thereof to the operating position, the internal spool 21 connects the inlet 4 and the drain port 22 at a certain opening degree, whereby the outlet 5 of the outlet 5 is connected. The hydraulic pressure is set relatively low. This low hydraulic pressure, when introduced into clutch 15 or clutch 16,
The value is such that they can be connected in the half-clutch state.

When the operating lever 20 of the low speed valve 3 is set to the non-operating position,
The communication opening between the inlet 4 and the drain port 22 is greatly reduced,
Or closed, resulting in clutch 15 or clutch
The outlet 5 supplies enough hydraulic pressure to fully connect 26.

The spool 21 is also controlled by the governor 25. The governor 25 is driven by an engine output shaft 26, and its oil inlet and outlet are connected to the source pressure circuit 2 and the low speed valve 3 via a governor feed circuit 27 and a governor feedback circuit 28, respectively. The governor 25 is configured to increase or decrease the discharge hydraulic pressure to the governor feedback circuit 28 when the rotation speed of the output shaft 26 changes. Therefore, when the operating lever 20 of the low speed valve 3 is maintained at a constant position, if the output shaft speed temporarily changes due to a change in the engine speed or a load acting on the output shaft, the governor hydraulic pressure is changed. The change is fed back to the low pressure valve 3, and the hydraulic pressure supplied from the low speed valve 3 to the control pressure circuit 6 is maintained constant, so that the output shaft rotation speed returns to the initial value. In order to perform such control, the outlet of the governor feedback circuit 28 is connected to the working chamber facing the spool 21 of the low speed valve 3.

The switching valve 7 includes a spool 31 which is operated by an operating lever 30, and the inlet 8 is selectively connected to the clutch circuit 13 or 14 depending on the position of the spool 31, or the inlet 8 is shut off. Connect both clutch circuits 13, 14 to the drain circuit.

A safety valve 35 is connected to the source pressure circuit 2, and an inlet circuit 37 of a clutch hydraulic pressure regulating valve 36 is connected downstream of the safety valve 35. The outlet of the clutch hydraulic pressure regulating valve 36 is connected to a low pressure circuit 38 (lubricating oil circuit). The low-voltage circuit 38 is the clutch 15,
It is connected to low-pressure parts such as 16 lubricated parts and other lubricated parts. Further, the low pressure circuit 38 is provided with a lubricating hydraulic pressure regulating valve 39.

The clutch hydraulic pressure regulating valve 36 includes an inlet circuit 37 and a low pressure circuit 38.
A spool 40 is provided for controlling the opening degree of communication with. The spool 40 is urged in the opening increasing direction by the pilot hydraulic pressure introduced from the inlet circuit 37 through the pilot hydraulic circuit 41, and the pilot hydraulic circuit 42 described later is also used.
The setting oil pressure introduced from the above and the elastic force of the internal oil pressure setting spring urge the opening degree decreasing direction.

Further, according to the present invention, a silencer 50 is provided between the control pressure circuit 6 and the low voltage circuit 38. The silencer 50 includes a pressure regulating valve 51 and a flow rate control valve 52. The inlet circuit 53 of the pressure regulating valve 51 is connected to the control pressure circuit 6, and the intermediate circuit 54 is connected to the inlet of the flow control valve 52. The outlet circuit 55 of the flow control valve 52 is connected to the low pressure circuit 38.

The pressure regulating valve 51 includes a spool 60 that controls the opening degree of the inlet circuit 53 and the intermediate circuit 54, and a spring 65 that biases the spool 60 in the opening degree decreasing direction. Further, the pressure regulating valve 51 is provided with a pilot hydraulic circuit 62 for exerting the hydraulic pressure of the inlet circuit 53 on the spool 60 in the opening increasing direction.

The flow control valve 52 includes a spool 70 that controls the opening degree of communication between the intermediate circuit 54 and the outlet circuit 55, and a spring 71 that biases the spool 70 in one direction. Further, the flow control valve 52 is provided with hydraulic oil chambers (not shown) facing both ends of the spool 70, and pilot hydraulic circuits 72, 73 connected to these chambers, respectively. The pilot hydraulic circuit 72 is connected to the intermediate circuit 54, from which the hydraulic pressure acts on the spool 70 in the opposite direction to the spring 71. Pilot hydraulic circuit 73 is outlet circuit 55
The hydraulic pressure therefrom acts on the spool 70 in the same direction as the spring 71. Further, the outlet circuit 55 is provided with a throttle 75 between the inlet of the pilot hydraulic circuit 73 and the outlet of the flow control valve 52.

The spool 70 of the flow control valve 52 communicates the intermediate circuit 54 and the outlet circuit 55 in the neutral position, and closes the internal passage even when the spool 70 is displaced from that position in either direction. Therefore, when the difference between the hydraulic pressure of the intermediate circuit 54 and the hydraulic pressure of the outlet circuit 55 is equal to (or approximately equal to) the value corresponding to the elasticity of the spring 71, the spool 70 is in the neutral position and opens the internal passage. On the other hand, when the difference (absolute value) between the hydraulic pressure of the intermediate circuit 54 and the hydraulic pressure of the outlet circuit 55 exceeds a predetermined range, the spool 70 moves in either direction from the neutral position and shuts off the internal passage.

The above-mentioned specifications of each part are specifically set so that each part operates as follows.

In the clutch disengaged (neutral) state, the switching valve 7 shuts off the hydraulic pressure to both the clutch circuits 13 and 14. In this state, each circuit is maintained at a low pressure.

Next, the clutch connection state will be described. First, in the trolling operation state, that is, in the operation state in which the operating lever 20 of the low speed valve 3 is moved to the operating position and the hydraulic pressure to the control pressure circuit 6 is significantly limited, the hydraulic pressure from the source pressure circuit 2 is changed to the low speed valve 3 After being decompressed to some extent by the switching valve 7, for example, the clutch circuit
Since it is supplied to the clutch 16 via 14, the clutch 16 is engaged in a half-clutch state, and the vessel makes a slight forward movement.

In this operating state, the hydraulic pressure of the intermediate circuit 54 is also low corresponding to the hydraulic pressures of the control pressure circuit 6 and the inlet circuit 53.

In this state, even if the hydraulic pressure discharged from the clutch hydraulic pressure regulating valve 36 to the low pressure circuit 38 also becomes relatively high, the outlet circuit 55
From the pilot hydraulic circuit 73 to the spool 70 becomes relatively larger than the hydraulic pressure from the pilot hydraulic circuit 72 to the spool 70, and the flow control valve 52 is closed. Therefore, oil cannot flow through the intermediate circuit 54, and the pressure regulating valve 51 stops its mechanism. As a result, the silencer 50 does not substantially affect the hydraulic pressure of the control pressure circuit 6.

Further, a case where the engine is operated at a low speed and the clutch 15 or 16 is connected without operating the low pressure valve 3 will be described.
In this state, the hydraulic pressure of the low pressure circuit 38 becomes relatively low corresponding to the engine speed, and the hydraulic pressure transmitted from the inlet circuit 53 to the intermediate circuit 54 becomes low corresponding to the hydraulic pressure of the control pressure circuit 6, It is higher than the low voltage circuit 38. As a result, the spool 70 maintains the neutral state, and the intermediate circuit 54 and the outlet circuit 55 communicate with each other. Therefore, the pressure regulating valve 51
Performs a pressure adjusting operation, and the hydraulic pressure of the control pressure circuit 6 is adjusted so low that the clutch 15 or 16 is in a half-clutch state.

Next, a state in which the engine is operated at a high speed and the clutch 15 or the clutch 16 is completely engaged without operating the low speed valve 3 will be described. In this state, the hydraulic pressure of the source pressure circuit 2 is sent to the clutch circuit 13 or the clutch circuit 14 via the low speed valve 3, the control pressure circuit 6, and the switching valve 7 without being substantially reduced. Therefore, a relatively high pressure is also introduced into the intermediate circuit 54 of the silencer 50, which results in the flow control valve 52 closing.
The hydraulic pressure is prevented from escaping from the control pressure circuit 6 to the low pressure circuit 38 via the silencer 50, and the control pressure circuit 6 is maintained at a predetermined high hydraulic pressure.

In an operating state in which the clutch is completely connected and the engine speed is low, torque fluctuation is likely to occur in the engine, and gear rattle of the power transmission system may occur.

However, according to the above-described present structure, in this operating state, the pressure regulating valve 51 operates to reduce the hydraulic pressure of the control pressure circuit 6 and, as a result, the clutch 15 or the clutch 16 becomes a half-clutch engagement, so that the clutch 15 or the clutch 16 is attached to them. It is possible to prevent noise from being generated in gears and the like.

[Advantages of the Invention] As described above, according to the present invention, the flow control valve 52 is provided side by side with the pressure regulating valve 51 to configure the silencer 50, whereby the silencer 50 is controlled downstream of the low speed valve 3. Since it can be installed side by side with the pressure circuit 6, the silencer 50 is prevented from directly affecting the hydraulic pressure supplied to the governor feed circuit 27 of the governor 25, and accurate hydraulic control is performed in any operating condition. The noise reduction device 50 adjusts the hydraulic pressure of the control pressure circuit 6 to a low pressure, and does not directly transmit torque fluctuations or rotation fluctuations when the engine is running at low speeds. Noise can be reliably prevented.

Of course, considering the operation of the governor 25, it is not necessary to provide an opening / closing mechanism for the inlet port of the silencer 50 in the low speed valve 3 as conventionally proposed, which simplifies the structure and improves the operation accuracy. be able to.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention. 1 ... Oil pump, 2 ... Source pressure circuit, 3 ... Low speed valve, 6 ... Control pressure circuit, 7 ... Switching valve, 13, 14 ... Clutch circuit, 15, 16
... clutch, 25 ... governor, 26 ... output shaft, 36 ... clutch hydraulic pressure regulating valve, 38 ... low pressure circuit, 50 ... silencer, 51 ... pressure regulating valve, 52 ... flow control valve

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An oil pump for discharging hydraulic oil at a hydraulic pressure corresponding to the rotational speed of an engine or a clutch input shaft, a clutch switching valve for supplying and disconnecting hydraulic pressure to and from a hydraulic clutch, and a hydraulic pressure for completely connecting the clutch. And a low pressure valve that can selectively set the hydraulic pressure that can incompletely connect the clutch,
A governor that generates a governor oil pressure corresponding to a change in the output shaft speed and a low pressure valve are installed side by side so that the governor oil pressure keeps the outlet oil pressure of the low pressure valve constant with respect to the change in the output shaft speed. A hydraulic control valve mechanism that is operated,
A source pressure circuit that connects the outlet of the oil pump and the inlet of the low pressure valve, a control pressure circuit that connects the outlet of the low pressure valve and the inlet of the clutch switching valve, and the inlet is connected to the source pressure circuit to control the hydraulic pressure of the source pressure circuit. A clutch hydraulic pressure regulating valve for setting a set value is provided, and the clutch hydraulic pressure regulating valve has an inlet connected to the source pressure circuit, an outlet connected to the low pressure portion via the low pressure circuit, and a setting for setting the above set value. A hydraulic pressure inlet is provided, and a setting hydraulic pressure introducing circuit for introducing the outlet hydraulic pressure of the clutch switching valve to the setting hydraulic pressure inlet is provided, whereby the hydraulic pressure of the source pressure circuit is set according to the switching state of the clutch switching valve. The control circuit and the low-pressure circuit are connected by a muffling circuit, and a muffling pressure regulating valve for adjusting the oil pressure by discharging oil to the outlet is provided in the upstream part of the muffling circuit, and the flow control valve is provided in the downstream part of the muffling circuit. The flow rate Valves and clutch hydraulic control system absolute value is characterized by being configured to open only when a predetermined value or less of the difference between the inlet pressure and outlet pressure.