JP4100373B2 - solenoid valve - Google Patents

Description

  The present invention relates to a spool valve type solenoid valve that drives a spool using electromagnetic force.

Conventionally, as a hydraulic control valve for controlling the hydraulic pressure (hydraulic oil pressure) supplied to a hydraulic control device of an automatic transmission mounted on an automobile or the like, for example, an electromagnetic valve described in Patent Document 1 is known. is there. This solenoid valve is composed of a spool valve described below and a drive device incorporating a solenoid.
The spool valve is formed with a hollow cylindrical spool chamber, a sleeve formed with an input port, an output port, a drain port and the like communicating with the spool chamber, and a spool slidably inserted into the spool chamber. By adjusting the position of this spool, the pressure of hydraulic oil flowing out from the output port (output pressure) is controlled.
JP 2001-227669 A

  However, in the above solenoid valve, the drain port for discharging the hydraulic oil from the spool chamber is formed in the same direction as the mounting direction of the spool valve. For this reason, for example, as shown in FIG. 10, when the mounting surface 110 of the spool valve 100 stands upright with respect to the horizontal plane, the drain port 120 is disposed in the horizontal direction, so that the oil is not easily removed. When the oil remaining in the spool chamber 130 enters the driving device, the resistance increases and the responsiveness deteriorates. In particular, when foreign matter contained in the oil enters the sliding portion of the drive device, a problem of sliding failure occurs.

Further, as shown in FIG. 10, when another spool valve 150 having a common drain oil passage 140 is arranged on the upstream side (top side in the vertical direction), the oil flowing from the upstream side May flow into the drain port 120, which is a cause of deterioration in responsiveness.
The present invention has been made based on the above circumstances, and its purpose is to make it easier for the hydraulic fluid to flow out of the drain port, or to prevent the hydraulic fluid from flowing backward through the drain port, thereby reducing the responsiveness. The object is to provide a solenoid valve that can be prevented.

(Invention of Claim 1)
The present invention is an electromagnetic valve that includes a spool valve and a driving means, and the mounting surface of the spool valve is attached to the other side with an inclination of a predetermined angle with respect to a horizontal plane, and passes through the radial center of the spool chamber. Assuming that a vertical line that intersects the mounting surface of the spool valve at a right angle is assumed and the position where the vertical line intersects the inner peripheral surface of the spool chamber is the A position, the drain port has an inlet side opening connected to the spool chamber. The center of the part is provided so as to be located on the rural side in the top-and-bottom direction from the A position.
According to the above configuration, since the inlet of the drain port can be connected to a lower position with respect to the spool chamber, the working fluid easily flows out from the spool chamber to the drain port.

(Invention of Claim 2)
The solenoid valve according to claim 1 is characterized in that the drain port is provided at a position offset from the spool chamber toward the local side in the vertical direction.
According to this configuration, since the entire drain port can be arranged at a lower position with respect to the spool chamber, the working fluid easily flows out from the spool chamber to the drain port.

(Invention of Claim 3)
2. The solenoid valve according to claim 1, wherein the drain port is inclined from the inlet side connected to the spool chamber toward the outlet side connected to the discharge passage with respect to the direction in which the spool valve is installed toward the local side in the vertical direction. It is characterized by being provided.
According to this configuration, compared to the case where the drain port is provided in the same direction as the spool valve mounting direction (shown in FIG. 10), the drain port outlet side is provided at a lower position. Emission is improved.

(Invention of Claim 4)
The electromagnetic valve according to any one of claims 1 to 3, wherein the drain port is connected in a tangential direction of the spool chamber.
According to this configuration, since the drain port can be connected to the lowest position of the spool chamber, it is difficult for the hydraulic fluid to accumulate in the spool chamber, and the hydraulic fluid easily flows out from the spool chamber to the drain port.

(Invention of Claim 5)
The present invention is an electromagnetic valve that includes a spool valve and a drive means, and the mounting surface of the spool valve is mounted on the other side with a predetermined angle with respect to a horizontal plane, and the drain port is located upstream of the discharge passage. It has a backflow prevention structure that prevents the hydraulic fluid flowing from the side from flowing back into the spool chamber through the drain port.
According to this configuration, it is possible to prevent the flow of the working fluid that flows back through the drain port, so that the discharge performance of the working fluid is improved.

(Invention of Claim 6)
6. The electromagnetic valve according to claim 5, wherein the drain port is provided as a backflow prevention structure, with the lower end of the outlet side opening connected to the discharge passage retreating toward the spool chamber. And
According to this configuration, the hydraulic fluid flowing from the upstream side of the discharge passage is not received by the lower end side of the outlet side opening of the drain port, and can be prevented from flowing into the drain port.

(Invention of Claim 7)
6. The solenoid valve according to claim 5, wherein the drain port is provided at a position where the upper end of the outlet side opening connected to the discharge passage is lower than the lower end of the inlet side opening connected to the spool chamber as a backflow prevention structure. It is characterized by being.
According to this configuration, since the height difference can be provided between the upper end of the outlet side opening of the drain port and the lower end of the inlet side opening, the working fluid flowing from the upstream side of the discharge passage is allowed to flow in the drain port. Even when it flows into the inside, the flow of hydraulic fluid into the spool chamber can be suppressed by the height difference.

(Invention of Claim 8)
6. The solenoid valve according to claim 5, wherein the drain port is provided with a flange protruding into the discharge passage on the upper end side of the outlet side opening connected to the discharge passage as a backflow prevention structure. .
According to this structure, it can suppress that the hydraulic fluid which flowed from the upstream of the discharge passage flows into the inside of a drain port by the effect | action of the collar part provided in the upper end side of the exit side opening part of a drain port.

(Invention of Claim 9)
In any one of the solenoid valves described in claims 1 to 4, the drain port has any one of the backflow prevention structures described in claims 5 to 8.
In this case, the hydraulic fluid can easily flow out from the spool chamber to the drain port, and the hydraulic fluid flowing from the upstream side of the discharge passage can be prevented from flowing back into the spool chamber through the drain port. Can be improved.

(Invention of Claim 10)
The electromagnetic valve according to any one of claims 1 to 9, wherein the spool valve is disposed on the downstream side (the local side in the vertical direction) of another spool valve having a common discharge passage.
In this case, since the hydraulic fluid discharged from the upstream spool valve can be prevented from flowing into the spool chamber through the drain port provided in the spool valve of the present invention, the plurality of spool valves share the discharge passage. In the multiple configuration arranged in the vertical direction, it is possible to prevent deterioration of the responsiveness of the electromagnetic valve provided with the spool valve arranged on the downstream side.

(Invention of Claim 11)
Any one of the electromagnetic valves according to claims 1 to 10 can be used as a hydraulic control valve of an automatic transmission mounted on a vehicle.

  The best mode for carrying out the present invention will be described in detail with reference to the following examples.

FIG. 1 is a cross-sectional view of a spool valve showing a spool chamber and a drain port (AA cross-sectional view of FIG. 2), and FIG. 2 is a cross-sectional view of a hydraulic control valve (electromagnetic valve).
The solenoid valve of the present embodiment controls, for example, the hydraulic pressure (hydraulic oil pressure) supplied directly or indirectly to a multi-plate brake or a multi-plate clutch of an automatic transmission (not shown) mounted on an automobile. It is used as a hydraulic control valve 1 for this purpose.

As shown in FIG. 2, the hydraulic control valve 1 includes a drive device 2 and a spool valve 3, and an attachment surface 3 a of the spool valve 3 has an inclination of a predetermined angle with respect to a horizontal plane, and the other side 4 (See FIG. 1).
The drive device 2 includes a solenoid 5 resin-molded in a cylindrical shape, a yoke 6 that forms a magnetic circuit around the solenoid 5, a fixed iron core 7, a plunger 8, and the like.
In the solenoid 5, the duty ratio of the current supplied to the solenoid 5 is controlled by an unillustrated engine control device (referred to as ECU).

The yoke 6 also serves as a housing for the driving device 2 by forming a cylindrical outer peripheral portion 6a covering the outside of the solenoid 5 and an annular bottom surface portion 6b on one end side of the outer peripheral portion 6a.
The fixed iron core 7 is inserted into the solenoid 5 from the opening side (left side in the drawing) of the yoke 6 to the middle in the axial direction, and is provided integrally with the core portion 7a. And a flange portion 7b that closes the side, and together with the yoke 6, a fixed magnetic path is formed. The fixed iron core 7 is formed with a through hole 7c that penetrates the central portion in the radial direction in the axial direction.

The plunger 8 is slidably inserted inside the solenoid 5 so as to face the core portion 7a of the fixed iron core 7 in the axial direction, and is supported by the leaf spring 9 with an air gap between the plunger 8 and the core portion 7a. Yes. The leaf spring 9 is fixed to a protrusion 8 a provided at the end of the plunger 8 on the side opposite to the iron core, and the outer peripheral portion of the leaf spring 9 is caulked and fixed to the bottom surface portion 6 b of the yoke 6 via a cover 10.
The plunger 8 has a hole 8b formed at the center of the end surface on the iron core side (the left side in the figure), and one end of the shaft 11 is press-fitted and fixed in the hole 8b. The shaft 11 is inserted into the through-hole 7c of the fixed iron core 7, and the other end side end protrudes from the through-hole 7c.
When the solenoid 8 is energized through the ECU, the plunger 8 is attracted by the magnetic force generated between the plunger 8 and the plunger 8 and moves in the direction in which the air gap disappears (on the core 7a side).

The spool valve 3 includes a sleeve 13 that forms a hollow cylindrical spool chamber 12, a spool 14 that is slidably inserted into the spool chamber 12, and the like. One end of the sleeve 13 is a flange of the fixed iron core 7. The drive unit 2 is assembled by being in contact with the portion 7 b and being caulked and fixed to the end of the yoke 6.
The sleeve 13 has an input port 15 for supplying hydraulic oil to the spool chamber 12, an output port 16 for flowing hydraulic oil regulated from the spool chamber 12, and a drain oil passage 17 from the spool chamber 12 (see FIG. 1), a drain port 18 (first drain port 18a and second drain port 18b) for discharging the hydraulic oil, a feedback port 19 on which the pressure (output pressure) of the hydraulic oil flowing out from the output port 16 acts. Is provided.

  On the other hand, the spool 14 is provided with a first land 14a, a second land 14b, and a third land 14c in this order from the counter-drive device side (the left side in the figure) in the axial direction, and the outer peripheral surface of each land 14a to 14c and the spool chamber. A minute annular gap (clearance) is formed between the inner peripheral surface of the twelve. However, the first land 14a has a smaller outer diameter than the second land 14b and the third land 14c. Further, the inner diameter of the spool chamber 12 corresponding to the first land 14a is formed smaller than the inner diameter of the spool chamber 12 corresponding to the second land 14b and the third land 14c.

  A feedback chamber 20 communicating with the feedback port 19 is formed between the first land 14 a and the second land 14 b, and an output pressure is introduced into the feedback chamber 20. This output pressure acts on both side surfaces of the first land 14a and the second land 14b. However, the second land 14b has a larger outer diameter than the first land 14a, and the pressure receiving area on which the output pressure acts increases. Therefore, it acts as a force for pressing the spool 14 toward the driving device 2 side. The reason why the output pressure is fed back is to prevent the output pressure from fluctuating due to the fluctuation of the hydraulic pressure (input pressure) supplied to the input port 15.

A distribution chamber 21 for distributing hydraulic oil supplied to the input port 15 to the output port 16 and the first drain port 18a is formed between the second land 14b and the third land 14c.
The second drain port 18b is used when the hydraulic oil supplied to the distribution chamber 21 flows into the counter-distribution chamber side through the gap between the outer peripheral surface of the third land 14c and the inner peripheral surface of the spool chamber 12. It is provided to discharge the hydraulic oil.

The spool 14 is urged toward the driving device 2 by a spring 22 disposed on the side opposite to the driving device of the first land 14a, and a shaft portion 14d protruding forward (driving device 2 side) from the third land 14c. The tip is held in contact with the end surface of the shaft 11.
Therefore, the spool 14 has an electromagnetic attraction force (a force for attracting the plunger 8 in the left direction in FIG. 2) generated by energizing the solenoid 5, a force received by the spool 14 from the output pressure introduced into the feedback chamber 20, It stops at a position where three forces, which are the urging force of the spring 22, are balanced.

Next, the relationship between the spool chamber 12 and the drain port 18 will be described.
The hydraulic control valve 1 of the present embodiment has the following characteristics in order to make it easier for hydraulic oil to flow out from the spool chamber 12 to the drain port 18.
An imaginary vertical line passing through the center of the spool chamber 12 in the radial direction and perpendicular to the mounting surface 3a of the spool valve 3 is assumed, and the position where the vertical line intersects the inner peripheral surface of the spool chamber 12 on the drain port 18 side is the A position. Assuming that, the drain port 18 of this embodiment is provided so that the center (B position) of the inlet side opening connected to the spool chamber 12 is located on the local side in the vertical direction from the A position. (See FIG. 1).

  More specifically, as shown in FIG. 1, the center axis Po of the drain port 18 is provided at a position shifted from the center axis So of the spool chamber 12 to the local side in the vertical direction. In other words, the drain port 18 is connected to the spool chamber 12 at a position that is offset to the upside down region. In FIG. 1, the cross section of the shaft portion 14d of the spool 14 is omitted.

  According to the above configuration, the center of the drain port 18 is aligned with the center of the spool chamber 12, and the spool port 18 is compared with the case where the drain port 18 is provided in the same direction as the mounting direction of the spool valve 3 (see FIG. 10). When the valve 3 is disposed to be inclined with respect to the horizontal direction, the entire drain port 18 can be disposed at a lower position with respect to the spool chamber 12. As a result, the hydraulic oil easily flows out from the spool chamber 12 to the drain port 18, so that the amount of hydraulic oil remaining in the spool chamber 12 can be reduced. As a result, it is possible to suppress the hydraulic oil remaining in the spool chamber 12 from flowing into the drive device 2, thereby preventing the response of the drive device 2 from deteriorating due to the hydraulic oil flowing in.

FIG. 3 is a cross-sectional view of the spool valve 3 showing the spool chamber 12 and the drain port 18 (A-A cross-sectional view of FIG. 2).
As described in the first embodiment, the drain port 18 of the present embodiment is provided so that the center (B position) of the inlet side opening connected to the spool chamber 12 is located on the rural side in the vertical direction from the A position. 1 (see FIG. 1), and with respect to the mounting direction of the spool valve 3 indicated by an arrow in the figure, from the inlet side connected to the spool chamber 12 toward the outlet side connected to the drain oil passage 17, Inclined to the local side.

  According to the above configuration, the center of the drain port 18 is aligned with the center of the spool chamber 12, and the spool port 18 is compared with the case where the drain port 18 is provided in the same direction as the mounting direction of the spool valve 3 (see FIG. 10). The inlet of the drain port 18 can be provided at a lower position with respect to the chamber 12, and the inclination angle of the drain port 18 with respect to the spool chamber 12 can be made larger than the mounting direction of the spool valve 3. That is, the outlet side of the drain port 18 connected to the drain oil passage 17 can be provided at a lower position. As a result, the hydraulic oil easily flows out from the spool chamber 12 to the drain port 18, so that the amount of the hydraulic oil remaining in the spool chamber 12 can be reduced, and the hydraulic oil remaining in the spool chamber 12 moves into the drive device 2. Since it can suppress flowing in, the responsiveness deterioration of the drive device 2 can be prevented.

4 is a cross-sectional view of the spool valve 3 showing the spool chamber 12 and the drain port 18 (A-A cross-sectional view of FIG. 2).
As described in the first embodiment, the drain port 18 of the present embodiment is provided so that the center (B position) of the inlet side opening connected to the spool chamber 12 is located on the rural side in the vertical direction from the A position. In addition, as shown in FIG. 4, the spool chamber 12 is connected in the tangential direction. That is, the inner peripheral surface of the bottom portion in the circumferential direction of the drain port 18 is connected to the inner peripheral surface of the spool chamber 12 in a tangential direction.

  According to the above configuration, since the drain port 18 can be connected to the lowest position of the spool chamber 12, it is difficult for hydraulic oil to accumulate in the spool chamber 12, and the hydraulic oil that has flowed out of the spool chamber 12 into the drain port 18 is drain oil. Since it becomes easy to flow to the path 17, the amount of hydraulic oil remaining in the spool chamber 12 can be reduced. As a result, it is possible to suppress the hydraulic oil remaining in the spool chamber 12 from flowing into the drive device 2, thereby preventing the response of the drive device 2 from deteriorating due to the hydraulic oil flowing in.

6 is a cross-sectional view of the spool valve 3 showing the spool chamber 12 and the drain port 18 (cross-sectional view taken along the line AA in FIG. 2).
For example, as shown in FIG. 5, the spool valve 3 of the present embodiment is an example in which the spool valve 3 is arranged on the downstream side (the local side in the vertical direction) of the other spool valve 23 that shares the drain oil passage 17. There is a backflow prevention structure that prevents hydraulic oil flowing from the upstream side from flowing back into the spool chamber 12 through the drain port 18.

As shown in FIG. 6, the drain port 18 of the present embodiment is a spool valve indicated by an arrow in the lower end 18 d rather than the upper end 18 c of the outlet side opening connected to the drain oil passage 17 as shown in FIG. 6. 3 in the direction of the spool chamber 12 (in the direction of the inlet of the drain port 18) with respect to the mounting direction of 3 is set back by a predetermined amount L.
In this case, the hydraulic oil flowing from the upstream side of the drain oil passage 17 is not received by the lower end side of the outlet side opening of the drain port 18, so that the hydraulic oil flows into the drain port 18. Can be prevented.

FIG. 7 is a cross-sectional view of the spool valve 3 showing the spool chamber 12 and the drain port 18 (A-A cross-sectional view of FIG. 2).
As shown in FIG. 7, the drain port 18 of the present embodiment has a backflow prevention structure in which the upper end 18 c of the outlet side opening connected to the drain oil passage 17 is the inlet side opening connected to the spool chamber 12. It is provided at a position lower than the lower end 18e.
According to this configuration, since the height difference h can be provided between the upper end 18c of the outlet side opening of the drain port 18 and the lower end 18e of the inlet side opening, it has flowed from the upstream side of the drain oil passage 17. Even when the hydraulic oil flows into the drain port 18, the flow of hydraulic oil into the spool chamber 12 can be suppressed by the height difference h.

FIG. 8 is a cross-sectional view of the spool valve 3 showing the spool chamber 12 and the drain port 18 (A-A cross-sectional view of FIG. 2).
As shown in FIG. 8, the drain port 18 of the present embodiment is provided with a flange 24 protruding into the drain oil passage 17 at the upper end side of the outlet side opening connected to the drain oil passage 17 as shown in FIG. 8. ing.
According to this configuration, the hydraulic oil flowing from the upstream side of the drain oil passage 17 flows into the drain port 18 by the action of the flange 24 provided on the upper end side of the outlet side opening of the drain port 18. Can be suppressed. The flange 24 may be provided not only to protrude into the drain oil passage 17 but also to protrude downward so as to cover the upper end side of the outlet side opening of the drain port 18.

(Modification)
Although the hydraulic control valve 1 of Examples 4-6 described about the case where it arrange | positions in the downstream (region side of a top and bottom direction) of the other spool valve 23 which has the drain oil path 17 in common, Examples 4-6 The backflow prevention structure of the drain port 18 described in the above can be applied to the hydraulic control valve 1 described in the first to third embodiments. As a result, the hydraulic oil easily flows out of the spool chamber 12, and even when another spool valve 23 is arranged on the upstream side, the hydraulic oil flowing from the upstream side flows back through the drain port 18 and spools. It can suppress flowing into the chamber 12. As a result, the hydraulic oil discharge performance is improved, and the responsiveness of the drive device 2 can be prevented from deteriorating.

In the fourth to sixth embodiments, the case where the other spool valve 23 is arranged on the upstream side of the drain oil passage 17 has been described. However, even if the other spool valve 23 is not used, for example, as shown in FIG. In addition, even when another oil discharge route 25 is provided on the upstream side of the drain oil passage 17, the backflow prevention structure for the drain port 18 described in the fourth to sixth embodiments can be applied.
In Example 1, although the example which used the solenoid valve of this invention as the hydraulic control valve 1 was described, it is not limited to the hydraulic control valve 1, It can be used also for other uses (for example, flow control valve).

(Example 1) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. It is sectional drawing of a hydraulic control valve. (Example 2) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. (Example 3) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. (Example 4) which is sectional drawing which shows an example of the multiple structure which shares a drain oil path. (Example 4) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. (Example 5) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. (Example 6) which is sectional drawing of the spool valve which shows a spool chamber and a drain port. It is sectional drawing of the spool valve which shows the modification of a present Example. It is sectional drawing of the spool valve concerning a prior art.

Explanation of symbols

1 Hydraulic control valve (solenoid valve)
2 Drive device (drive means)
3 Spool valve 3a Spool valve mounting surface 12 Spool chamber 13 Sleeve 14 Spool 15 Input port 16 Output port 17 Drain oil passage (discharge passage)
18 Drain port 24 Isobe

Claims (11)

A hollow cylindrical spool chamber is formed, and an input port for supplying hydraulic fluid to the spool chamber, an output port for discharging the hydraulic fluid regulated from the spool chamber, and discharging the hydraulic fluid from the spool chamber to the discharge passage A spool valve having a sleeve provided with a drain port, and a spool slidably inserted into the spool chamber;
Drive means for driving the spool using electromagnetic force,
The mounting surface of the spool valve is an electromagnetic valve attached to the other side with a predetermined angle of inclination with respect to a horizontal plane,
Assuming that a vertical line passing through the center in the radial direction of the spool chamber and perpendicularly intersecting the mounting surface of the spool valve is assumed, and the position where the vertical line intersects the inner peripheral surface of the spool chamber is the A position, the drain The solenoid valve according to claim 1, wherein the port is provided such that a center of an inlet side opening connected to the spool chamber is located on a local side in a vertical direction from the position A. The solenoid valve according to claim 1,
The solenoid valve according to claim 1, wherein the drain port is provided at a position offset from the spool chamber to a local side in a vertical direction. The solenoid valve according to claim 1,
The drain port is provided so as to be inclined toward the local side in the vertical direction from the inlet side connected to the spool chamber toward the outlet side connected to the discharge passage with respect to the mounting direction of the spool valve. A solenoid valve characterized by that. The electromagnetic valve according to any one of claims 1 to 3,
The solenoid valve according to claim 1, wherein the drain port is connected in a tangential direction of the spool chamber. A hollow cylindrical spool chamber is formed, and an input port for supplying hydraulic fluid to the spool chamber, an output port for discharging the hydraulic fluid regulated from the spool chamber, and discharging the hydraulic fluid from the spool chamber to the discharge passage A spool valve having a sleeve provided with a drain port, and a spool slidably inserted into the spool chamber;
Drive means for driving the spool using electromagnetic force,
The mounting surface of the spool valve is an electromagnetic valve attached to the other side with a predetermined angle of inclination with respect to a horizontal plane,
The drain port has a backflow prevention structure for preventing hydraulic fluid flowing from the upstream side of the discharge passage from flowing back into the spool chamber through the drain port. valve. In the solenoid valve according to claim 5,
The drain port is a solenoid valve characterized in that, as the backflow prevention structure, the lower end of the drain side opening connected to the discharge passage is retracted toward the spool chamber. In the solenoid valve according to claim 5,
As the backflow prevention structure, the drain port is provided at a position where the upper end of the outlet side opening connected to the discharge passage is lower than the lower end of the inlet side opening connected to the spool chamber. And solenoid valve. In the solenoid valve according to claim 5,
The drain port is a solenoid valve characterized in that, as the backflow prevention structure, a flange protruding into the discharge passage is provided on an upper end side of an outlet side opening connected to the discharge passage. In any one of the solenoid valves according to claims 1 to 4,
The said drain port has the said backflow prevention structure in any one of Claims 5-8, The solenoid valve characterized by the above-mentioned. In any one of the solenoid valves according to claims 1 to 9,
The electromagnetic valve according to claim 1, wherein the spool valve is arranged on the downstream side (the local side in the vertical direction) of another spool valve sharing the discharge passage. The electromagnetic valve according to any one of claims 1 to 10, wherein the electromagnetic valve is used as a hydraulic control valve of an automatic transmission mounted on a vehicle.

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