JP3408635B2 - Three-way solenoid valve and method of driving three-way solenoid valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way solenoid valve and a method for driving the three-way solenoid valve.

[0002]

2. Description of the Related Art As a conventional on-off type three-way solenoid valve, for example, when the solenoid is on, the input port is cut off from the output port and closed, and the output port communicates with the discharge port. In some cases, when the solenoid is off, the input port communicates with the output port to open the valve, and the output port is cut off from the discharge port.

[0003]

However, in such a conventional on-off type three-way solenoid valve as described above, when oil is drained from the output port to the discharge port when the solenoid is on, it is connected to the output port. Air may mix into the signal pressure circuit, and the compression ratio of air is higher than the compression ratio of oil.Therefore, when the solenoid is switched from on to off, the air in oil is compressed by the hydraulic pressure. Since it takes time, there is a problem that the responsiveness of the hydraulic circuit may be deteriorated when the three-way solenoid valve is switched from on to off. Further, as a method of driving a three-way solenoid valve, Japanese Patent Laid-Open No. 2-248
There is also a method of duty driving on the low voltage side as shown in Japanese Patent No. 782. This is because when the valve is closed and duty is driven while fluid does not flow from the input port to the output port, slight vibration is given to the movable part during valve closing and the solenoid is turned off. The valve is designed to operate smoothly. However, even in such a three-way solenoid valve that is duty-driven on the low pressure side, air may mix from the exhaust port side to the signal pressure circuit side when the valve is closed. However, the problem that the response of the hydraulic circuit may be deteriorated at the time of switching cannot be solved. The present invention aims to solve such problems.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by allowing an extremely low pressure to act on the signal pressure circuit side when the three-way solenoid valve is drained. That is, the three-way solenoid valve according to claim 1 of the present invention includes the case (10) in which the pressure supply port (10a), the signal pressure port (10b) and the drain port (10c) are formed, and the case (10). A valve seat member (34) having a seat surface (34a) formed therein, and a valve member (30) capable of opening or closing the seat surface (34a) of the valve seat member (34).
And a solenoid (18) for driving the valve member (30),
When a predetermined pressure is applied to the pressure supply port (10a) and the solenoid (18) is in either the off state or the on state, the valve is opened to open the pressure supply port (10a). ) To the signal pressure port (10b), the signal pressure port (10b) is disconnected from the drain port (10c), and the solenoid (18) is closed in either of the other states to close the signal pressure. Port (10b)
Is configured to be disconnected from the pressure supply port (10a) and the signal pressure port (10b) communicates with the drain port (10c). The pressure supply port (10a) and the signal pressure Port (10b)
It is characterized in that it has a throttle channel (38) that always communicates with. It should be noted that, as in claim 2, the throttle channel (38) includes the case (10) and the valve seat member (3).
It can be formed between the fitting portions with 4). Further, in the method for driving a three-way solenoid valve according to claim 3, when the solenoid is not energized, the signal pressure port is disconnected from the drain port and the pressure supply port is in communication with the signal pressure port in an open state, and the solenoid is energized. When duty-driving a three-way solenoid valve in which the signal pressure port communicates with the drain port and the pressure supply port is shut off from the signal pressure port, the valve member of the three-way solenoid valve moves in the valve closing direction. It is characterized in that the three-way solenoid valve is duty-driven in a state in which the movement stroke of the valve member is set so as not to close the valve completely even when it is driven.

[0005]

According to the first aspect of the present invention, the three-way solenoid valve is configured so that even when the signal pressure circuit of the three-way solenoid valve is drained, a minimum flow rate can be made to flow from the pressure supply side to the signal pressure circuit through the throttle passage. When configured, the signal pressure circuit can be maintained at an extremely low pressure even if the signal pressure circuit is drained, so that air does not accumulate in the circuit and the responsiveness of the hydraulic circuit is not reduced. Further, as in claim 3, the three-way solenoid valve is configured such that the pressure supply side communicates with the signal pressure circuit side when the solenoid is turned off, and the valve member of the three-way solenoid valve is driven in the valve closing direction. Even when the signal pressure circuit is drained, if the solenoid is duty-driven with the stroke of the valve member set so that the valve does not close completely, the signal pressure will be reduced even if the signal pressure circuit is drained. Since the circuit can be maintained at an extremely low pressure, air does not accumulate in the signal pressure circuit and the responsiveness of the hydraulic circuit does not deteriorate.

[0006]

EXAMPLE FIG. 3 shows an example of a partial configuration of a hydraulic circuit using a three-way solenoid valve. This is the CO clutch 50 and B
This is for controlling the 1 brake 52. The pressure supply port 10a of the three-way solenoid valve 40 for controlling the CO clutch 50 has a hydraulic pipe 4 connected to the throttle system.
2 is connected, and the signal pressure port 10b has a CO control valve 46 and a CO damper 4 of the signal pressure circuit 40.
8 is connected. B similar to the three-way solenoid valve 40
The three-way solenoid valve 60 for controlling the 1 brake 52 has a pressure supply port 60a to which a hydraulic pipe 42 connected to a throttle system is connected, and a signal pressure port 60a.
B1 control valve 62 and B1 damper 64 are provided in b.
The control pressure of is connected. By driving the three-way solenoid valve 40, the CO control valve 46 is operated, and the appropriate engagement control of the CO clutch 50 is performed.
Also, by driving the three-way solenoid valve 60, B
1 control valve 62 is activated, B1 brake 5
2 appropriate braking control is performed. In addition, in FIG.
2 relay valve 54, CO inhibit valve 56, C
Although the 3-relay valve 58 and the like are shown, since these are members that are not directly related to the present invention, detailed description of these members will be omitted. Also, three-way solenoid valves 40 and 6
Since 0 has the same structure, only the three-way solenoid valve 40 will be described below, and the description of the three-way solenoid valve 60 will be omitted. (First Embodiment) FIG. 1 shows a first embodiment of the present invention. In the first embodiment, the three-way solenoid valve 40 is configured to allow a minimum flow rate from the pressure supply side to the signal pressure circuit side even when the signal pressure circuit side is drained. . The three-way solenoid valve 40 includes a case 10 and a rear case 1 made of a magnetic material that form a magnetic circuit.
2, core 14 and core 1 screwed to the rear case 12
4, a bobbin 16 made of an insulating material arranged on the outer peripheral side of the coil 4, a coil (solenoid) 18 wound around the bobbin 16, and a coil 1.
8, a lead wire 20 for energizing 8, a support member 22 for fixedly supporting the lead wire 20, a plate 24 made of a magnetic material forming a part of a magnetic circuit, a plunger 26 arranged on the left end side of the core 14 in the drawing, Stem 2 integrated with plunger 26
8, a ball (valve member) 30 fixed to the stem 28, a guide member 32 for guiding the axial movement of the stem 28, and a first valve seat forming a first valve body portion with the ball 30 ( It has a valve seat member) 34, a second valve seat 36 disposed on the opposite side (right side in the drawing) of the first valve seat 34 with the ball 30 in between, and a spring 39. The case 10 has a pressure supply port 10a arranged so as to pass through an axial center portion thereof, a signal arranged so as to be orthogonal to the axial center of the case 10, and a signal arranged so as to be axially displaced from each other. A pressure port 10b and a drain port 10c are formed respectively. Core 1
4 has a relief hole 14a for discharging the oil that has flowed into the core 14 through the outer peripheral portion of the stem 28 and the outer peripheral portion of the plunger 26. First valve seat 34
A seat surface 34a is formed on the second valve seat 36, and a seat surface 36a is formed on the second valve seat 36 in the same manner.
The spring 39 described above is used for the plunger 26 and the stem 2.
A force is exerted so that the ball 30 integrated with 8 is pushed toward the first valve seat 34 against the force based on the hydraulic pressure from the pressure supply port 10a acting on the ball 30. As a result, when no current is supplied to the coil 18, the ball 30 moves toward the seat surface 34 a of the first valve seat 34 through the plunger 26 and the stem 28 against the force of hydraulic pressure by the spring 39. When the coil 18 is pressed, the seat surface 36a side of the second valve seat 36 is opened, and when a current is supplied to the coil 18, an electromagnetic force resists the force of the spring 39 and the plunger 26 and Ball 3 integrated with stem 28
0 is pushed rightward in FIG. 1 and is pushed toward the seat surface 36a of the second valve seat 36, so that the seat surface 34a side of the first valve seat 34 is opened. The above structure is the same as that of the conventional three-way solenoid valve. The first embodiment of the present application is characterized in that a throttle channel 38 that constantly connects the pressure supply port 10a and the signal pressure port 10b is formed between the first valve seat 34 and the case 10. . In the case of the first embodiment, the throttle channel 38 is a radial groove-shaped throttle flow formed between the left end surface of the first valve seat 34 in the drawing and the corresponding inner end surface of the case 10. It is composed of a passage 38a and an axially cylindrical space-like throttle passage 38b formed at a fitting portion of both members 10 and 34. Both throttle channels 3
8a and 38b are in communication with each other. Throttle channel 38
Is in a state where a predetermined rated pressure is supplied to the pressure supply port 10a and the signal pressure circuit is in communication with the drain (that is, the coil 18 is in the current-off state), and the throttle channel 38 flows from the pressure supply port 10a. Via signal pressure port 10b
The dimensions are set so that the signal pressure circuit can maintain a predetermined extremely low pressure (a pressure low enough to prevent air from being sucked from the drain port 10c side) by the fluid supplied to the.

Next, the operation of the first embodiment will be described. When a predetermined rated pressure is supplied to the pressure supply port 10a of the three-way solenoid valve 40 and no current is supplied to the coil 18, the plunger 26 and the stem 28
The ball 30 which is integral with
Since the second valve seat 36 is pressed against the seat surface 34a of the valve seat 34 and the seat surface 36a side of the second valve seat 36 is opened, the signal pressure port 10b communicates with the drain port 10c. As a result, the oil pressure of the signal pressure circuit is communicated with the tank, but the signal pressure port 10b
Always communicates with the pressure supply port 10a through the throttle channel 38. Therefore, the pressure reduced by the throttle channel 38 is supplied from the pressure supply port 10a to the signal pressure port 10b, the signal pressure circuit is kept at a predetermined extremely low pressure, and air is not accumulated in the circuit. In addition, air is prevented from entering the signal pressure circuit from the drain port 10c through the signal pressure port 10b. next,
When current is supplied to the coil 18, the plunger 2
6 and the ball 28 integrated with the stem 28 are springs 39
Seat surface 36a of the second valve seat 36 against the force of
Since the seat surface 34a side of the first valve seat 34 is opened by being pressed toward, the signal pressure port 10b is
The predetermined hydraulic pressure acts on the signal pressure circuit by directly communicating with the pressure supply port 10a. In this way, air is prevented from entering the signal pressure circuit, so that the response of the hydraulic circuit using the three-way solenoid valve 40 can be made better than before. In the configuration of the first embodiment, the signal pressure port 10b is the throttle channel 3
Since it is in constant communication with the pressure supply port 10a through the pressure supply port 8, the pressure supply port 1
Although a slight amount of lost oil flows from 0a toward the tank, such loss energy can be made small by properly designing the throttle passage 38. The three-way solenoid valve 4 of the first embodiment
0 is suitable for applications in which duty driving is required when the valve is open.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. As the three-way solenoid valve used in the second embodiment, a known type is used in which the valve is opened when the coil is not energized and closed when the coil is duty-driven. That is, the three-way solenoid valve does not require a throttle passage as in the first embodiment described above. However, in the present invention, in the three-way solenoid valve, the movement stroke of the ball is set so as not to be completely closed even when the ball (valve member) is driven in the valve closing direction. Further, as shown in FIG. 4A, the coil is driven at an intermediate duty when the coil is energized.

Next, the operation of the second embodiment will be described. When the coil is not energized, the three-way solenoid valve is opened, and a predetermined pressure is supplied to the signal pressure circuit from the pressure supply port, as shown in FIG. Next, when the coil is duty-driven, the signal pressure circuit is drained, but a minute flow rate continues to be supplied to the signal pressure circuit from the pressure supply port. The pressure is maintained and air is prevented from entering the signal pressure circuit. As a result, even in the drain state, air is not mixed in the signal pressure circuit, so that the response of the hydraulic circuit using the three-way solenoid valve can be made more stable and better than before. . The method for driving the three-way solenoid valve according to the second embodiment is suitable for applications in which it is not necessary to perform duty driving when the valve is opened.

In the description of the first embodiment,
Although the three-way solenoid valve 40 of the type that opens when the coil 18 is energized is used, the present invention is not limited to this, and the signal supply circuit is always connected from the pressure supply side through the throttle passage. Any type of three-way solenoid valve may be used as long as it is configured to allow an extremely small flow rate, and another type of three-way solenoid valve that opens when the coil is not energized. Further, in the above description of the first embodiment, the throttle passage 38 is formed in the three-way solenoid valve 40 by the case 10 and the valve seat 34, but the present invention is not limited to this, and for example, pressure It is also possible to connect the supply side and the signal pressure circuit side by an external throttle pipe.

[0011]

As described above, according to the present invention, even when the signal pressure circuit of the three-way solenoid valve is in communication with the drain, the signal pressure circuit is maintained in an extremely low pressure state,
Since it is possible to prevent air from entering the signal pressure circuit,
The responsiveness of the hydraulic circuit using the three-way solenoid valve can be made more stable and better than before.

[Brief description of drawings]

FIG. 1 is a diagram showing a three-way solenoid valve according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a method for driving a three-way solenoid valve according to the present invention.

FIG. 3 is a partial configuration diagram showing an application example in which the three-way solenoid valve of the present invention is used in a hydraulic circuit of an automatic transmission.

[Explanation of symbols]

10 cases 10a Pressure supply port 10b Signal pressure port 10c drain port 18 solenoid 30 balls (valve member) 34 Valve seat (valve seat member) 34a seat surface 38 Throttle channel 40 3-way solenoid valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-89881 (JP, A) JP-A-2-248782 (JP, A) JP-A-4-54387 (JP, A) Actual development 57- 53172 (JP, U) Actual development Sho 60-175970 (JP, U) Actual development 1-15884 (JP, U) Actual development 4-99481 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16K 31/06

Claims (3)

(57) [Claims] 1. A case (10) in which a pressure supply port (10a), a signal pressure port (10b) and a drain port (10c) are formed respectively, and a seat surface (34a) housed in the case (10). Valve seat member (3
4), a valve member (30) capable of opening or closing the seat surface (34a) of the valve seat member (34), and a solenoid (18) for driving the valve member (30). With a predetermined pressure acting on the supply port (10a),
When the solenoid (18) is in either the OFF or ON state, the valve is opened to supply the hydraulic pressure from the pressure supply port (10a) to the signal pressure port (10b) and the signal pressure port (10b) is used as the drain port. When the solenoid (18) is in the other state, the signal pressure port (10b) is closed and the signal pressure port (10b) is closed.
0a) and the signal pressure port (10b) is configured to communicate with the drain port (10c), the pressure supply port (10a) and the signal pressure port (1
0b) has a throttle channel (38) which is always in communication with the three-way solenoid valve. 2. The three-way solenoid according to claim 1, wherein the throttle channel (38) is formed between fitting portions of the case (10) and the valve seat member (34). valve. 3. The signal pressure port is disconnected from the drain port when the solenoid is not energized, and the pressure supply port is in communication with the signal pressure port in an open state. When the solenoid is energized, the signal pressure port becomes the drain port. In the method of driving a three-way solenoid valve in which the valve is closed and the pressure supply port is disconnected from the signal pressure port, the valve member of the three-way solenoid valve is driven in the closing direction. Even in such a case, a method for driving a three-way solenoid valve is characterized in that the three-way solenoid valve is duty-driven while the movement stroke of the valve member is set so as not to completely close the valve.