JP6506097B2 - Spool valve - Google Patents

Description

  The present invention relates to a spool valve.

DESCRIPTION OF RELATED ART Conventionally, there exists a thing as disclosed by patent document 1 as a spool valve used for hydraulic control apparatuses, such as an automatic transmission of a motor vehicle.
The spool valve has a sleeve having an input port, an output port and a drain port, and a spool which switches communication / shutdown of each port by axially displacing the inside of the sleeve, and controls the supply of oil to the control target Do. The spool is axially displaced by transmission of a thrust generated by an electromagnetic actuator, and functions as a valve body for opening and closing each port.

Further, as a technique relating to the spool valve, there is a technique for avoiding a phenomenon in which the foreign matter in the oil is caught in the gap between the spool and the sleeve and the spool can not slide.
For example, Patent Document 1 discloses a technique in which a circumferential groove for capturing foreign matter is provided at a position facing a port of a spool valve.

  The circumferential groove disclosed in Patent Document 1 allows the input port to face the circumferential groove even when the spool fully opens the input port and the spool fully closes the input port. Provided in According to this, it is possible to discharge the foreign matter captured at the time of full closing to the output port together with the flow of oil flowing from the input port to the output port at the time of full opening.

  However, in the above configuration, the axial length of the circumferential groove inevitably becomes large. If the circumferential groove for capturing foreign matter is too large, the sliding portion may become small and the sealing performance may be deteriorated. That is, when the sliding portion is desired to have a predetermined size in order to ensure sealing performance, the circumferential groove can not be enlarged, and it is difficult to design as described in Patent Document 1.

In addition, if the circumferential groove for capturing foreign matter is too large, there arises a problem that it becomes difficult to provide a centering groove for centering the spool. That is, providing the circumferential groove for capturing foreign matter causes a problem that the aligning function is lost.
Therefore, there is a need for a structure that can capture and release foreign matter while reducing the circumferential groove for capturing the foreign matter.

JP 2007-92768 A

  The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a spool valve capable of capturing and releasing foreign matter while reducing the circumferential groove provided on the spool for storing the foreign matter. It is to do.

The spool valve of the present invention comprises a sleeve and a spool described below.
The sleeve has an input port into which the oil flows and an oil pressure is input, an output port for outputting the oil pressure to the control target chamber, and a drain port for discharging the oil.

The spool has an input land which slides in the sleeve to open and close the input port, and a drain land which opens and closes the drain port.
The spool valve has a closed state in which the input port is closed by the input land to shut off between the input port and the output port, and the drain port is opened by the drain land to communicate between the drain port and the output port. The input port is opened by the input land to communicate between the input port and the output port, and the drain port is closed by the drain land to switch between open states in which the drain port and the output port are shut off.

In addition, the spool valve of the present invention is provided with a foreign matter capture groove and a foreign matter discharge port described below.
The foreign matter trapping groove is a circumferential groove formed on the outer peripheral surface of the input land, which can communicate with the input port in the closed state, and traps foreign matter contained in oil from the input port.

The foreign matter discharge port is a port formed in the sleeve, and in the open state, communicates with the foreign matter capture groove to discharge the foreign matter trapped in the foreign matter capture groove to the outside of the sleeve.
Here, in the open state, the entire foreign matter trapping groove faces the foreign matter discharge port.

According to the present invention, foreign matter can be captured and released even if the foreign matter capture groove is short in the axial direction.
In the conventional example, the groove for capturing foreign matter is in communication with the input port both in the closed state and in the open state, and the foreign matter captured in the closed state is input port in the open state. The foreign matter is discharged from the foreign matter trapping groove and discharged to the outside of the sleeve by utilizing the flow of oil from the oil to the output port. Therefore, the axial length of the groove is long.

  However, in the present embodiment, in the open state, the foreign matter is discharged from the foreign matter capture groove so as to communicate with the foreign matter discharge port provided separately from the input port, and the foreign matter is discharged to the outside of the sleeve by the foreign matter discharge port. doing.

  Therefore, at the spool position in the open state, the foreign matter discharge port may be provided at the position where the foreign matter trapping groove faces, and it is not necessary to increase the axial length of the foreign matter trapping groove. It becomes possible to freely design the position and size of the foreign matter trapping groove without being restricted by the relationship between the input port position and the opening / closing stroke amount. The opening / closing stroke amount is a stroke amount of the spool required to switch between the open state and the closed state.

  And since a foreign material capture groove can be made small, it becomes easy to provide a centering groove. Therefore, the aligning function of the spool is not impaired.

It is whole sectional drawing of a sleeve valve (Example 1). It is a principal part expanded sectional view of a sleeve valve (Example 1). It is a principal part expanded sectional view of a sleeve valve (Example 1). It is a principal part expanded sectional view of a sleeve valve (Example 2). It is a principal part expanded sectional view of a sleeve valve (Example 2). It is a principal part expanded sectional view of a sleeve valve (Example 3). It is a principal part expanded sectional view of a sleeve valve (Example 3). It is a principal part expanded sectional view of a sleeve valve (Example 4). It is a principal part expanded sectional view of a sleeve valve (Example 4). It is a principal part expanded sectional view of a sleeve valve (Example 5). It is a principal part expanded sectional view of a sleeve valve (Example 5). It is a principal part expanded sectional view of a sleeve valve (Example 6). It is a principal part expanded sectional view of a sleeve valve (Example 6). It is a principal part expanded sectional view of a sleeve valve (Example 6). It is a whole sectional view of a sleeve valve (modification).

  The mode for carrying out the present invention will be described in detail by the following examples.

Example 1
Configuration of Example 1
The configuration of the spool valve 1 according to the first embodiment will be described with reference to FIGS.
The spool valve 1 is used, for example, in a hydraulic control device such as an automatic transmission of an automobile.

The spool valve 1 comprises a cylindrical sleeve 2, a spool 3 axially slidably accommodated in the sleeve 2, a spring 4 urging the spool 3 toward one axial end (actuator side), and a spring 4. The actuator 5 is provided to move the spool 3 to one end in the axial direction against the biasing force.
Each configuration will be described in detail below.

  The sleeve 2 has a cylindrical shape, and communicates with the inside of the cylinder, and at least one each of an input port 8, an output port 9, a drain port 10, and a feedback port 11 are provided.

Each of the ports 8 to 11 has a hole penetrating through the cylindrical wall of the sleeve 2, and in the present embodiment, from the one end in the axial direction to the other end (from the right in the figure, to the left) The input port 8, the output port 9, and the drain port 10 are formed in this order.
The feedback port 11 is in constant communication with the output port 9.

The sleeve 2 is inserted into the insertion hole 13 a of the fixing member 13.
The fixing member 13 is formed with a flow path 13 b communicating with the input port 8, a flow path 13 c communicating with the output port 9 and the feedback port 11, and a flow path 13 d communicating with the drain port 10.

  The flow path 13b is connected to a pump 14 which is a hydraulic pressure source, the flow path 13c communicates with a control target chamber (not shown), and the flow path 13d is connected to a predetermined low pressure space (not shown). It is in communication.

The spool 3 has an input land 18 in sliding contact with the inner peripheral surface of the sleeve 2, a drain land 19, and a feedback land 20.
The input land 18 opens and closes the input port 8.
The drain land 19 opens and closes the drain port 10.

Each of the lands 18 to 20 is formed in the order of the feedback land 20, the input land 18, and the drain land 19 from one axial end to the other (from the right to the left in the drawing).
On the outer peripheral surface of the feedback land 20 and the input land 18, a centering groove 22 which is a circumferential groove for forming an oil film between the inner peripheral surface of the sleeve 2 and the inner peripheral surface of the sleeve 2 is formed.

  In the sleeve 2, the space between the input land 18 and the drain land 19 (the space formed around the small diameter shaft 24 connecting the input land 18 and the drain land 19) always communicates with the output port 9. The distribution chamber 25 is

Further, the space between the input land 18 and the feedback land 20 is a space in which the feedback port 11 communicates.
The input land 18 is formed larger in diameter than the feedback land 20, and the feedback pressure acts on the area corresponding to the difference in diameter between the input land 18 and the feedback land 20, so that the other end side in the axial direction A biasing force is applied to the spring 4 in a direction to resist the biasing force.

The spring 4 is a coil spring disposed on the other end side in the axial direction of the spool 3 and is formed in the spring chamber 27 formed between the lid 26 for closing the other end side in the axial direction of the sleeve 2 and the spool 3 Housed in
One end in the axial direction of the spring 4 is engaged with the spool 3 and the other end in the axial direction is engaged with the lid 26 to urge the spool 3 toward one end in the axial direction.

The actuator 5 is, for example, a linear solenoid. That is, an electromagnetic actuator having a known structure including a coil 30 generating a magnetic force by energization, a stator 31 disposed inside the coil 30 to form a magnetic circuit, a plunger 32 magnetically attracted to the stator 31 and the like It is. The drive of the actuator 5 is controlled by an electronic control unit (not shown).
The plunger 32 moves to the other axial end side by energization of the coil 30.

  FIG. 3 is a view showing a state in which the spool 3 is pressed to one end side in the axial direction by the biasing force of the spring 4 at the time of non-energization.

  FIGS. 1 and 2 are views showing a state in which the spool 3 is moved to the other axial end side by the driving force of the actuator 5 at the time of energization. The spool 3 in FIG. 3 is located at the movement limit position (ACT limit position) to the other axial end side by the actuator 5. In this embodiment, since the actuator 5 is a linear solenoid, the ACT limit position is determined by the movement limit position of the plunger 32 to the other axial end side. That is, the ACT limit position is a position at which the spool 3 is pushed by the plunger 32 and moved most to the other axial end side.

  The spool valve 1 of the present embodiment is a normally open type, and as shown in FIG. 3, the input land 18 opens the input port 8 and the drain land 19 closes the drain port 10 when not energized. ing. That is, the input port 8 and the output port 9 communicate with each other, and the output port 9 and the drain port 10 are in a disconnected state (open state).

  Then, when the coil 30 is energized, the spool 3 is driven to the other end in the axial direction against the biasing force of the spring 4, and as shown in FIG. 1 and FIG. It closes and the drain land 19 will be in the state which opened the drain port 10. FIG. That is, the connection between the input port 8 and the output port 9 is interrupted, and the communication between the output port 9 and the drain port 10 is established (closed state).

  When the input land 18 maximizes the opening area of the input port 8 in the open state, the output hydraulic pressure from the output port 9 becomes maximum. Further, in the closed state, no output hydraulic pressure is generated at the output port 9.

[Features of Example 1]
The spool valve 1 according to the present embodiment includes a foreign matter trapping groove 35 and a foreign matter discharge port 36 described below.

  The foreign matter trapping groove 35 is a circumferential groove formed on the outer peripheral surface of the input land 18, and can communicate with the input port 8 in the closed state (see FIG. 2), and foreign matter contained in oil from the input port 8 Capture

The foreign material capture groove 35 is formed on the outer peripheral surface of the input land 18 on the other axial end side with respect to the alignment groove 22.
Further, in the foreign matter trapping groove 35, in the closed state (see FIG. 2), the groove sidewall 35a on the other axial end side of the foreign matter trapping groove 35 is the axis of the outlet opening of the input port 8 (opening of the sleeve inner circumferential surface). It is provided to face the direction end 8 a in the radial direction.

That is, foreign matter in the oil from the input port 8 enters the foreign matter trapping groove 35 via the sliding clearance between the inner peripheral surface of the sleeve 2 and the input land 18 between the input port 8 and the foreign matter trapping groove 35. It is possible to communicate.
Foreign matter enters the gap between the groove sidewall 35a and the axial end 8a. Then, it is pushed by the oil or the subsequent foreign matter and falls into the foreign matter trapping groove 35.

  Preferably, one of the positions of the foreign material capture groove 35 is radially opposed to one axial end 8 a of the input port 8. For example, any position between the groove sidewall 35a on the other axial end side of the foreign material capture groove 35 and the groove sidewall 35b on the axial one end side radially faces the axial end 8a of the input port 8 May be

The foreign matter discharge port 36 is formed in the sleeve 2 between the input port 8 and the feedback port 11.
In the open state (see FIG. 3), the foreign material capture groove 35 and the foreign material discharge port 36 communicate with the foreign material discharge port 36 so that the foreign material captured by the foreign material capture groove 35 can be discharged.
For example, the positional relationship between the foreign material capture groove 35 and the foreign material discharge port 36 is a relationship in which the entire foreign material capture groove 35 radially faces the foreign material discharge port 36 in the open state (see FIG. 3).

  The foreign matter discharge port 36 communicates with the communication passage 38 communicating with the drain port 10 in the open state (see FIG. 3).

The communication passage 38 is formed in the drain land 19 and communicates with the drain port 10 in the open state, the communication port 40 in communication with the circumferential groove 39 in the open state, and the inside of the cylindrical wall of the sleeve 2. And an in-wall flow passage 41 for constantly communicating between the communication port 40 and the foreign matter discharge port 36.
The communication port 40 is a port opened and closed by the drain land 19 and is formed on the other end side in the axial direction of the drain port 10.

Action of Example 1
(1) When the coil is energized and the spool valve is closed (see Figure 2)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.

  In the closed state, the communication port 40 is closed to the drain land 19 and does not communicate with the circumferential groove 39, so the foreign matter discharge port 36 and the drain port 10 are shut off.

(2) When the coil 30 is deenergized and the spool valve 1 is opened (see FIG. 3).
When the coil 30 is de-energized, the spool 3 is returned to one axial end by the biasing force of the spring 4, the input land 18 opens the input port 8, and the input port 8 and the output port 9 communicate with each other. It becomes.

At this time, the foreign material capture groove 35 communicates with the foreign material discharge port 36. Then, the communication port 40 communicates with the circumferential groove 39, and the foreign matter discharge port 36 and the drain port 10 communicate with each other.
Thus, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the foreign matter discharge port 36. Then, the fluid is discharged to the outside of the sleeve 2 through the foreign matter discharge port 36, the communication passage 38 and the drain port 10.

  In the closed state, when it comes to the open state, the foreign matter which tries to enter the sliding clearance between the inner peripheral surface of the sleeve on the other axial end side of the input port 8 and the input land 18 becomes: The oil is discharged from the output port 9 to the outside of the sleeve in accordance with the flow of oil from the input port 8 to the output port 9.

[Effect of Example 1]
In the present embodiment, the foreign matter trapping groove 35 communicates with the input port 8 in the closed state, and communicates with the foreign matter discharge port 36 in the open state.
According to this, even if the foreign material capture groove 35 is short in the axial direction (that is, even if the groove width of the circumferential groove is small), foreign material can be captured and released.

  In the conventional example, the groove for capturing foreign matter is in communication with the input port 8 both in the closed state and in the open state, and the foreign matter captured in the closed state is input in the open state. The oil flow from the port 8 to the output port 9 is used to discharge foreign matter to the outside of the sleeve through the output port. Therefore, the groove needs to be in communication with the input port 8 even in the open state, and the axial length is long.

  However, in the present embodiment, in the open state, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the foreign matter discharge port 36 in communication with the foreign matter discharge port 36 provided separately from the input port 8. The foreign matter is discharged to the outside of the sleeve by the foreign matter discharge port 36.

  For this reason, at the spool position in the open state, the foreign matter discharge port 36 may be provided at the position where the foreign matter trapping groove 35 faces, and it is not necessary to increase the axial length of the foreign matter trapping groove 35. That is, the position and the size of the foreign matter trapping groove 35 can be designed freely without being restricted by the relationship between the input port position and the opening / closing stroke amount.

  And since the foreign material capture groove 35 can be made small, the alignment groove 22 can be easily provided. Therefore, the alignment function of the spool 3 is not impaired.

  Further, in the present embodiment, the foreign matter discharge port 36 communicates with the low pressure space outside the sleeve only when the foreign matter discharge port 36 is in the open state. According to this, the hydraulic pressure is easily loaded on the alignment groove 22 in the closed state or the hydraulic pressure adjustment state, and the alignment mechanism can be sufficiently exhibited.

  The hydraulic pressure adjustment state is a state between the open state and the closed state, and the input port 8 is opened by the input land 18 and the drain port 10 is opened by the drain land 19, and the input port Both the port 8 and the drain port 10 are in communication with the output port 9. At this time, an output hydraulic pressure corresponding to the axial position of the spool 3, that is, according to the opening degree of the input port 8 is generated at the output port 9.

Further, in the present embodiment, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the outside of the sleeve 2 via the foreign matter discharge port 36, the communication passage 38 and the drain port 10.
This is an example of the foreign matter discharge using the foreign matter discharge port 36.

Example 2
The second embodiment will be described with reference to FIGS. 4 and 5 focusing on differences from the first embodiment.
The same reference numerals as those in the first embodiment denote the same functional objects, and reference is made to the preceding description.
In the present embodiment, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the low pressure space through the foreign matter discharge port 36 and the spring chamber 27.

  That is, the spring chamber 27 communicates with the low pressure space outside the sleeve, and the sleeve 2 has a communication passage 45 capable of communicating the foreign matter discharge port 36 with the spring chamber 27.

The communication passage 45 is a communication port 46 which is opened by the drain land 19 and in communication with the spring chamber 27 in the open state, and a flow passage extending axially in the cylindrical wall of the sleeve 2. And a foreign matter discharge port 36 are constantly communicated with each other.
The communication port 46 is a port opened and closed by the drain land 19 and is formed on the other end side in the axial direction of the drain port 10.

[Operation of Example 2]
(1) When the spool valve is closed at coil energization (see FIG. 4)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.

  In the closed state, the communication port 46 is closed to the drain land 19, and the space between the foreign matter discharge port 36 and the spring chamber 27 is shut off.

(2) When the coil 30 is deenergized and the spool valve 1 is opened (see FIG. 5).
When the coil 30 is de-energized, the spool 3 is returned to one axial end by the biasing force of the spring 4, the input land 18 opens the input port 8, and the input port 8 and the output port 9 communicate with each other. It becomes.

At this time, the foreign material capture groove 35 communicates with the foreign material discharge port 36. Then, the communication port 46 is opened by the drain land 19, and the foreign matter discharge port 36 and the spring chamber 27 communicate with each other.
Thus, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the foreign matter discharge port 36. Then, the fluid is discharged to the outside of the sleeve 2 via the foreign matter discharge port 36, the communication passage 45, and the spring chamber 27.

  Also in the present embodiment, the same function and effect as in the first embodiment can be obtained.

[Example 3]
The third embodiment will be described with reference to FIGS. 6 and 7 focusing on differences from the first embodiment.
The same reference numerals as those in the first embodiment denote the same functional objects, and reference is made to the preceding description.
In the present embodiment, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the low pressure space through the foreign matter discharge port 36 and the space 48 between the actuator 5 and the sleeve 2.

The sleeve 2 is fixed to the actuator 5 in a state where one axial end surface of the sleeve 2 and the other axial end surface of the stator 31 are in contact with each other.
The diameter of the hole at one axial end side (including the opening at one axial end) of the sleeve 2 relative to the sliding portion of the feedback land 20 is sufficiently larger than that of the spool 3. A space 48 is formed. And this space 48 is in communication with the low pressure space outside the sleeve.

Further, the sleeve 2 has a communication passage 49 capable of communicating the foreign matter discharge port 36 with the space 48.
The communication passage 49 is formed in the feedback land 20 and communicates with the space 48 in the open state, the communication port 51 in communication with the circumferential groove 50 in the open state, and the cylindrical wall of the sleeve 2. An axially extending flow path is provided, and has an in-wall flow path 52 that constantly communicates between the communication port 51 and the foreign matter discharge port 36.

The communication port 51 is a port opened and closed by the feedback land 20 and is formed on one end side in the axial direction of the feedback port 11.
In the first embodiment, two alignment grooves 22 are provided in the feedback land 20, but in the present embodiment, a location where the circumferential groove 50 is provided is required, so one alignment groove 22 is provided. There is.

Action of Example 3
(1) When the spool valve is closed at coil energization (see FIG. 6)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.

  In the closed state, the communication port 51 is closed to the feedback land 20, and the space between the foreign matter discharge port 36 and the space 48 is shut off.

(2) When the coil 30 is deenergized and the spool valve 1 is opened (see FIG. 7).
When the coil 30 is de-energized, the spool 3 is returned to one axial end by the biasing force of the spring 4, the input land 18 opens the input port 8, and the input port 8 and the output port 9 communicate with each other. It becomes.

At this time, the foreign material capture groove 35 communicates with the foreign material discharge port 36. Then, the communication port 51 is opened by the feedback land 20, and the foreign matter discharge port 36 and the space 48 communicate with each other.
Thus, the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the foreign matter discharge port 36. Then, the fluid is discharged to the outside of the sleeve 2 via the foreign matter discharge port 36, the communication passage 49 and the space 48.

  Also in the present embodiment, the same function and effect as in the first embodiment can be obtained.

Example 4
The fourth embodiment will be described with reference to FIGS. 8 and 9, focusing on differences from the first embodiment.
The same reference numerals as those in the first embodiment denote the same functional objects, and reference is made to the preceding description.
The spool valve of the present embodiment, unlike the first to third embodiments, discharges the foreign material captured by the foreign material capture groove 35 to the input port 8.

The spool valve 1 is provided with drive means for moving the spool 3 so as to expand the communication area between the input port 8 and the foreign matter trapping groove 35 while maintaining the closed state.
The communication area is a cross-sectional area of the flow path that connects the input port 8 and the foreign material capture groove 35.

When the spool 3 is moved in the axial direction, the region of the foreign material capture groove 35 and the input port 8 facing in the radial direction changes.
In the present embodiment, in the closed state where the spool 3 has reached the ACT limit position, the communication area between the foreign material capture groove 35 and the input port 8 is the smallest, and from this state the spool 3 is in the axial direction When moved to the other end side, the communication area between the input port 8 and the foreign material capture groove 35 is enlarged.

In the present embodiment, as in the first embodiment, the groove sidewall 35a on the other axial end side of the foreign matter trapping groove 35 is provided to radially face the axial end 8a of the input port 8 The communication area at this time is approximately the same as the sliding clearance.
Then, when the spool 3 is moved to the other end side in the axial direction, the axial range in which the opening of the input port 8 and the opening of the foreign matter catching groove 35 are radially opposed is increased. That is, the communication area is expanded.

The spring 4 can be further contracted when the spool 3 reaches the ACT limit position.
The driving means applies hydraulic pressure to the other end side in the axial direction to the spool 3 from the state of reaching the ACT limit position, and moves the spool 3 to the other end side in the axial direction against the biasing force of the spring 4 It is a hydraulic pressure supply mechanism 53.

The details will be described below.
FIG. 8 shows a state where the coil 3 is energized and the spool 3 is driven to the other axial end side by the actuator 5 against the biasing force of the spring 4 and the spool 3 has reached the ACT limit position. . At this time, the spring 4 has a margin for further contraction.

The hydraulic pressure supply mechanism 53 includes a differential land 54, a differential port 55, a communication passage 56, and a valve 57.
The differential land 54 is a land having a diameter smaller than that of the feedback land 20 formed on one end side in the axial direction of the feedback land 20.
In the sleeve 2, the space between the differential land 54 and the feedback land 20 is a space in which the differential port 55 communicates.

  The differential port 55 is formed on one end side of the feedback port 11 in the axial direction, and is connected to the input port 8 by the communication passage 56. In the present embodiment, the communication passage 56 is formed in the fixing member 13.

  A valve 57 for opening and closing the communication passage 56 is disposed in the middle of the communication passage 56. The valve 57 is a solenoid valve whose drive is controlled by an electronic control unit (not shown).

When the communication passage 56 is opened by the valve 57 while the spool 3 has reached the ACT limit position, oil flows into the space between the differential land 54 and the feedback land 20 through the differential port 55.
Thus, the hydraulic pressure acts on the area corresponding to the difference in diameter between the differential port 55 and the feedback land 20, whereby the spool 3 is urged toward the other end side in the axial direction (the direction against the biasing force of the spring 4). Is added.

Action of Example 4
(1) When the spool valve is closed at coil energization (see FIG. 8)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.
The valve 57 closes the communication passage 56.

(2) The valve 57 is open (see FIG. 9).
From the state shown in FIG. 8, when the valve 57 opens the communication passage 56, oil flows into the space between the differential land 54 and the feedback land 20 through the differential port 55.
Thus, the hydraulic pressure acts on the area corresponding to the difference in diameter between the differential port 55 and the feedback land 20, whereby the spool 3 is urged toward the other end side in the axial direction (the direction against the biasing force of the spring 4). Is added.

As a result, the spool 3 moves to the other axial end side further than the ACT limit position.
The communication area between the foreign matter trapping groove 35 and the input port 8 is expanded, and the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the input port 8.

[Effect of Example 4]
According to the present embodiment, it is not necessary to capture and release the foreign matter in the foreign matter trapping groove 35 before and after the dynamic movement of the spool 3 which switches between the closed state and the open state, Before and after the movement of the spool 3, it is possible to capture and release foreign matter in the foreign matter trapping groove 35.
Therefore, it is not necessary to increase the axial length of the foreign material capture groove 35.

  And since the foreign material capture groove 35 can be made small, the alignment groove 22 can be easily provided. Therefore, the alignment function of the spool 3 is not impaired.

[Example 5]
The fifth embodiment will be described with reference to FIGS. 10 and 11, focusing on differences from the fourth embodiment.
The same reference numerals as those in the fourth embodiment denote the same functional objects, and the preceding description will be referred to.
In the present embodiment, the hydraulic pressure supply mechanism 53 drives the spool 3 using the feedback port 11 instead of the differential port 55.

  The hydraulic pressure supply mechanism 53 of this embodiment includes a hydraulic pressure distribution port 60, a distribution communication passage 61, a feedback land 20, a feedback port 11, a communication passage 62, and a valve 63.

The hydraulic pressure distribution port 60 is a port that can communicate with the distribution chamber 25, and is formed between the input port 8 and the output port 9. And it can be opened and closed by the input land 18.
The distribution communication path 61 is a flow path which makes the hydraulic pressure distribution port 60 and the feedback port 11 always communicate with each other.

In the present embodiment, the output port 9 and the feedback port 11 can communicate with each other by the hydraulic pressure distribution port 60 and the distribution communication passage 61.
When the spool 3 is located on the other axial end side of the predetermined position on the other axial end side of the ACT limit position, the input land 18 closes the hydraulic pressure distribution port 60. Otherwise, the input land 18 opens the hydraulic pressure distribution port 60, and the output port 9 and the feedback port 11 communicate with each other.

  The feedback port 11 of the present embodiment is connected to the input port 8 by the input port 8 and the communication passage 62. In the present embodiment, the communication passage 62 is formed in the fixing member 13.

A valve 63 for opening and closing the communication passage 62 is disposed in the middle of the communication passage 62.
The valve 63 is a solenoid valve whose drive is controlled by an electronic control unit (not shown).

  Note that the flow path of the flow path (the flow path formed of the hydraulic pressure distribution port 60 and the distribution communication path 61) that causes the output port 9 and the feedback port 11 to communicate with each other when the spool 3 has reached the ACT limit position. The resistance is larger than the flow path resistance of the communication path 62.

  Therefore, when the communication passage 62 is opened by the valve 63 from the state where the spool 3 has reached the ACT limit position, oil flows into the space between the input land 18 and the feedback land 20 through the feedback port 11. Then, the hydraulic pressure acts on the area corresponding to the diameter difference between the input land 18 and the feedback land 20, whereby an urging force to the spool 3 at the other axial end side (direction against the urging force of the spring 4) is applied. Be

[Operation of Example 5]
(1) When the spool valve is closed at coil energization (see FIG. 10)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.
The valve 63 closes the communication passage 62.

(2) The valve 63 is open (see FIG. 11).
From the state shown in FIG. 10, when the valve 63 opens the communication passage 62, the oil flows into the space between the input land 18 and the feedback land 20 through the feedback port 11.
As a result, the hydraulic pressure acts on the area corresponding to the diameter difference between the input land 18 and the feedback land 20, whereby the biasing force toward the other end side in the axial direction (the direction against the biasing force of the spring 4) is applied to the spool 3 Be added.

As a result, the spool 3 moves to the other axial end side further than the ACT limit position. As soon as it starts to move, the hydraulic distribution port 60 is closed by the input land 18.
As the spool 3 moves to the other axial end side, the communication area between the foreign material capture groove 35 and the input port 8 is expanded, and the foreign material captured in the foreign material capture groove 35 is released to the input port 8 .

  Also according to the present embodiment, the same function and effect as those of the fourth embodiment can be obtained.

[Example 6]
A sixth embodiment will be described with reference to FIGS. 12 to 14 focusing on differences from the fourth embodiment.
The same reference numerals as those in the fourth embodiment denote the same functional objects, and the preceding description will be referred to.
In the present embodiment, the spool 3 is divided into two in the axial direction in the middle of the input land 18, and a first portion 3A forming a portion on the other end side in the axial direction and a second portion forming a portion on the one end side in the axial direction And 3B. Then, only the first portion 3A is moved by the hydraulic pressure supply mechanism 53.
The details will be described below.

The spool 3 has a dividing surface 3 c at a predetermined position in the axial direction of the input land 18. A small diameter portion 3d smaller than the outer diameter of the input land 18 is provided at the other axial end of the second portion 3B.
When the first portion 3A and the second portion 3B are in contact with each other, the small diameter portion 3d is a circumferential groove formed on the outer periphery of the input land 18.

  The foreign matter trapping groove 35 is formed on the outer peripheral surface of the input land 18 of the first portion 3A.

The hydraulic pressure supply mechanism 53 of this embodiment includes a split port 66, a communication passage 67, and a valve 68.
The split port 66 is a port that communicates with the space 69 formed around the small diameter portion 3 d in the sleeve, and is formed between the input port 8 and the feedback port 11.

The communication path 67 is a flow path for communicating the split port 66 with the external low pressure space, and is formed in the fixing member 13. A valve 68 for opening and closing the communication passage 62 is disposed in the middle of the communication passage 67.
The valve 68 is a solenoid valve whose drive is controlled by an electronic control unit (not shown).

FIG. 12 shows the spool valve 1 when the coil is not energized.
At the time of non-energization, the valve 68 opens the communication passage 67, and no hydraulic pressure is generated in the split port 66 and the space 69. The spool 3 is urged toward one end side in the axial direction by the spring 4 and stands still in a state where the first portion 3A and the second portion 3B abut.

When coil energization is started from the state shown in FIG. 12, the spool 3 is urged toward the one end in the axial direction by the spring 4 and pushed toward the other end in the axial direction by the actuator 5, so the first portion 3A and the second portion 3B And move to the other end in the axial direction with the
FIG. 13 shows a state in which the spool 3 has reached the ACT limit position by energizing the coil 30.

  Then, when the communication passage 67 is closed by the valve 68 from the state where the ACT limit position is reached, oil pressure is generated in the split port 66 and the space 69. That is, since oil slightly flows into the space 69 from the input port 8 through the sliding clearance between the input land 18 and the inner peripheral surface of the sleeve, oil pressure is generated in the split port 66 and the space 69.

  When oil pressure is generated in the space 69, the first portion 3A is pressed to the other end side in the axial direction, and the second portion 3B is pressed to the one end side in the axial direction.

  In the state of reaching the ACT limit position, the first portion 3A moves to the other end side in the axial direction when receiving a pressing force larger than the biasing force of the spring 4 because the spring 4 still has room to contract. See Figure 14). The second portion 3B remains stationary in the state of being pressed to one end side in the axial direction. Therefore, only the first portion 3A moves to the other axial end side.

[Operation of Example 6]
(1) When the spool valve is closed at coil energization (see FIG. 13)
At this time, the spool 3 is in the ACT limit position, and the input land 18 closes the input port 8.
Foreign matter contained in the oil from the input port 8 travels toward the surface of the input land 18 exposed to the input port 8.
Then, the foreign matter which has advanced to one end side in the axial direction enters the foreign matter capture groove 35. That is, the foreign matter is trapped by the foreign matter trapping groove 35.
As described above, at this time, the valve 68 opens the communication passage 67, and the first portion 3A and the second portion 3B are in contact with each other.

(2) The valve 68 is closed (see FIG. 14).
As described above, when the valve 68 closes the communication passage 67 from the state shown in FIG. 13, oil pressure is generated in the split port 66 and the space 69, and the first portion 3A is further axially than the ACT limit position. Move to the side.
As a result, the communication area between the foreign matter trapping groove 35 and the input port 8 is expanded, and the foreign matter trapped in the foreign matter trapping groove 35 is discharged to the input port 8.

  Also according to the present embodiment, the same function and effect as those of the fourth embodiment can be obtained.

[Modification]
In the embodiment, the normally open type is used, but the normally closed type may be used.
That is, as shown in FIG. 15, the feedback port 11, the input port 8, the output port 9, and the drain port 10 are formed from one end side in the axial direction (the side away from the actuator 5). The present invention may be applied to a type in which the input port 8 is closed and the connection between the input port 8 and the output port 9 is blocked.

Reference Signs List 1 spool valve, 2 sleeve, 3 spool, 8 input port, 9 output port, 10 drain port, 18 input land, 19 drain land, 35 foreign object capture groove, 36 foreign object discharge port

Claims (7)

A sleeve (2) having an input port (8) into which oil flows and an oil pressure is input, an output port (9) outputting oil pressure to a control target chamber, and a drain port (10) discharging oil;
It has a spool (3) having an input land (18) which slides in the sleeve (2) to open and close the input port (8) and a drain land (19) which opens and closes the drain port (10). ,
The input port (8) is closed by the input land (18) to cut off between the input port (8) and the output port (9), and the drain port (10) is connected to the drain land (10). 19) and a closed state in which the drain port (10) and the output port (9) communicate with each other.
The input port (8) is opened by the input land (18) to establish communication between the input port (8) and the output port (9), and the drain port (10) is connected to the drain land (19). A spool valve which is closed by the switch to shut off between the drain port (10) and the output port (9),
A circumferential groove formed on the outer peripheral surface of the input land (18), which can communicate with the input port (8) in the closed state, and captures foreign matter contained in oil from the input port (8) Foreign object trapping groove (35),
It is a port formed in the sleeve (2), and in the open state, it is in communication with the foreign matter catching groove (35), and the foreign matter caught in the foreign matter catching groove (35) is made of the sleeve (2). And a foreign matter discharge port (36) for discharging to the outside ,
Wherein in the opened state, the spool valve the whole of the extraneous matter catching groove (35) and wherein the opposed to Rukoto the foreign matter discharge port (36). In the spool valve according to claim 1,
The drain port (10) is connected to a low pressure space outside the sleeve (2),
The sleeve (2) has a communication passage (38) capable of communicating the foreign matter discharge port (36) with the drain port (10).
A spool valve characterized in that foreign matter is discharged to the low pressure space through the foreign matter discharge port (36), the communication passage (38), and the drain port (10). In the spool valve according to claim 1,
A spring (4) for urging the spool (3) to one end in the axial direction;
An actuator (5) for moving the spool (3) to the other axial end side against the biasing force of the spring (4);
The sleeve (2) has a spring chamber (27) for housing the spring (4),
The spring chamber (27) is connected to a low pressure space outside the sleeve (2),
The sleeve (2) has a communication passage (45) capable of communicating the foreign matter discharge port (36) with the spring chamber (27).
A foreign material is discharged to the low pressure space through the foreign matter discharge port (36), the communication passage (45), and the spring chamber (27). In the spool valve according to claim 1,
A spring (4) for urging the spool (3) to one end in the axial direction;
An actuator (5) for moving the spool (3) to the other axial end side against the biasing force of the spring (4);
A space formed between the actuator (5) and the sleeve (2) and connected to a low pressure space outside the sleeve (2);
The sleeve (2) has a communication passage (49) capable of communicating the foreign matter discharge port (36) with the space (48),
A foreign matter is discharged to the low pressure space through the foreign matter discharge port (36), the communication passage (49), and the space (48). A sleeve (2) having an input port (8) into which oil flows and an oil pressure is input, an output port (9) outputting oil pressure to a control target chamber, and a drain port (10) discharging oil;
It has a spool (3) having an input land (18) which slides in the sleeve (2) to open and close the input port (8) and a drain land (19) which opens and closes the drain port (10). ,
The input port (8) is closed by the input land (18) to cut off between the input port (8) and the output port (9), and the drain port (10) is connected to the drain land (10). 19) and a closed state in which the drain port (10) and the output port (9) communicate with each other.
The input port (8) is opened by the input land (18) to establish communication between the input port (8) and the output port (9), and the drain port (10) is a drain land (19). A spool valve that switches between an open state closed by the valve to shut off between the drain port (10) and the output port (9),
A circumferential groove formed on the outer peripheral surface of the input land (18), which communicates with the input port (8) in the closed state and captures foreign matter contained in oil from the input port (8) A foreign matter capture groove (35),
And driving means (53) for moving the spool (3) so as to expand the communication area between the input port (8) and the foreign matter trapping groove (35) while maintaining the closed state.
Wherein in the opened state, the spool valve the whole of the extraneous matter catching groove (35) and wherein the opposed to Rukoto the foreign matter discharge port (36). The spool valve according to claim 5 is
A spring (4) for urging the spool (3) to one end in the axial direction;
An actuator (5) for moving the spool (3) to the other axial end side against the biasing force of the spring (4);
When the actuator (5) is deenergized, the input land (18) opens the input port (8), and the actuator (5) is energized to move the spool (3) to the other end side in the axial direction And the input land (18) closes the input port (8) by moving to the normally open type,
Assuming that the movement limit position of the spool (3) to the other axial end side by the actuator (5) is the ACT limit position,
The spring (4) can be further contracted when the spool (3) reaches the ACT limit position,
The driving means (53) applies an oil pressure to the other end side in the axial direction to the spool (3) from the state where the ACT limit position is reached, and the spool (3) is biased by the spring (4). A spool valve characterized in that it is a hydraulic pressure supply mechanism (53) for further moving it to the other end side in the axial direction. In the spool valve according to claim 6,
The spool (3) is axially divided into two in the middle of the input land (18), and forms a first portion (3A) forming a portion on the other end side in the axial direction and a portion on the one end side in the axial direction It consists of the second part (3B),
The foreign matter trapping groove (35) is formed on the outer peripheral surface of the input land (18) of the first portion (3A),
A spool valve characterized in that only the first portion (3A) is moved by the hydraulic pressure supply mechanism (53).

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