JP2016211657A - Spool valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve (spool valve) capable of forcibly discharging foreign matter entering a fitting clearance between a sleeve and a spool with a simple structure, and useful both in economical aspect and performance aspect.SOLUTION: In a spool valve, a plurality of ports 71-73 are arrayed in an axial direction to a sleeve 3 in order of an output port 72, an input port 71 and a drain port 73, and between the input port 71 and the drain port 73, provided is a pressure storage chamber 20 communicating with the input port 71. In communication between the input port 71 and the output port 72, fluid stored in the pressure storage chamber 20 is discharged to the input port 71 side, thereby to forcibly eliminate foreign matter.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a spool valve used for controlling the pressure and flow rate of a fluid, and more particularly to a linear solenoid type solenoid valve suitable for hydraulic control of an automatic transmission for an automobile.

[Conventional technology]
As a linear solenoid type solenoid valve to which a spool valve is applied, various configurations have been put to practical use, and a typical example is a linear solenoid type solenoid valve described in Patent Document 1, for example. It has been known.

  This solenoid valve, as a basic configuration, has a cylindrical sleeve (valve housing) having various ports such as an input port (feed port), an output port (control port), a drain port (discharge port) and a feedback port, and a linear solenoid. And a spool (valve element) that slides in the axial direction within the sleeve. The spool is composed of an electromagnetic force by a linear solenoid and an urging member (an elastic body such as a coil spring). )) Is used to adjust the pressure of the target fluid (hereinafter referred to as oil) to be controlled by applying the biasing force (hereinafter also referred to as mounting load) and balancing these two forces. ing. Thereby, the supply pressure of oil supplied to the input port (hereinafter also simply referred to as hydraulic pressure) is adjusted to an output pressure corresponding to the input control signal to the linear solenoid when the oil flows out from the control port.

  However, in the solenoid valve with the basic configuration as described above, when the spool is moved by the linear solenoid, the spool comes into surface contact with the edge portion of each port, so it cannot be removed by foreign matter contained in the oil to be supplied or discharged or by the manufacturing process. There is a risk that foreign matter will be caught between the edge portion of each port and the spool, the spool will stick, and smooth sliding of the spool will be hindered. In particular, since the input port side communicating with the fluid supply source is located under high pressure, the problem of foreign matter biting on the input port side has become apparent.

  Therefore, in the solenoid valve described in Patent Document 1, the foreign matter reservoir groove is formed at a position where the input port faces the spool so that the spool stick can be reduced even if foreign matter is included in the oil of the input port. A foreign matter removing means has been proposed in which foreign matter is accumulated in the groove.

  By the way, in a system that plays a central role in vehicle control, such as an automatic transmission for automobiles, higher performance (higher accuracy) is required year by year, including its components. For this reason, there is an urgent need to improve the performance of the component parts that construct such a system, especially the solenoid valve that constitutes the main part.

[Problems of the prior art]
However, it has been pointed out that the foreign substance removing means using the foreign substance reservoir groove as described above is still insufficient in order to respond to such a request.

(1) In other words, as the higher performance (high accuracy) is pursued in terms of performance, the oil-tight performance and alignment function between the sleeve and the spool become stricter, so that the above foreign matter removing means functions more effectively. There is a fear that it will not.
(2) According to the experiments and research conducted by the present inventors, it has been concluded that the following two points are the main factors.
First, the foreign matter reservoir groove impairs the oil tightness performance and alignment function, and it is difficult to provide a foreign matter reservoir groove with a sufficient volume.
・ Secondly, the tolerance (fit clearance) between the sleeve and the spool becomes strict, and no matter how small the clearance is set, the periphery of the foreign material reservoir groove due to the pressure difference between the input port and other adjacent ports In this case, a phenomenon occurs in which foreign matter is caught in the minute gap (that is, the fitting clearance) between the sleeve and the spool, and such foreign matter is switched from the communication state of the input port. The point that it cannot be removed only by switching to the communication state.

JP 2007-92768 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is to make it possible to forcibly discharge foreign matter caught in the fitting clearance between the sleeve and the spool while having a simple configuration, and to reduce the cost. An object of the present invention is to provide a useful spool valve that contributes both in terms of performance and performance.

[Means of Claim 1]
The invention according to claim 1 (spool valve) includes at least an input port that communicates with a fluid supply source, an output port that supplies fluid to a controlled object, and a drain that communicates with a drain as a plurality of ports that penetrate in the radial direction. A cylindrical sleeve provided with a port, and is slidably disposed in the axial direction inside the sleeve, and communication between the input port and the output port and between the output port and the drain port is caused by the displacement in the axial direction. The basic configuration includes a spool to be controlled, a drive mechanism that drives the spool in one axial direction, and a biasing member that biases the spool in a direction against the drive direction of the drive mechanism. Yes.

  In the spool valve of the present invention, each port is arranged in the axial direction in the order of the output port, the input port, and the drain port with respect to the sleeve, and communicates with the input port between the input port and the drain port. A pressure accumulation chamber is provided, and when the input port communicates with the output port, the fluid stored in the pressure accumulation chamber is discharged from the input port side to the output port side.

According to the above configuration, even when a foreign object is caught between the sleeve and the spool, the fluid stored in the pressure accumulation chamber is forcibly removed by discharging from the input port side to the output port side. Therefore, a spool valve excellent in performance can be provided.
Further, the additional pressure accumulating chamber may have a simple structure in which an annular recess is formed on the inner peripheral side of the sleeve, and a high-performance spool valve can be provided at a low cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a solenoid valve for hydraulic control, which is used for the entire description of a solenoid valve for hydraulic control as an application example of a spool valve of the present invention and the first embodiment of the present invention (Example 1). The main part of the said solenoid valve is expanded and shown, and it is a cross-sectional view which follows the II-II line in FIG. 1 (Example 1). FIG. 2 is a diagram for explaining the operation of the solenoid valve when energized, wherein (a) is a longitudinal sectional view of the main part of the solenoid valve, and (b) is a diagram schematically showing the flow path configuration of the solenoid valve (Example 1). ). It serves for explanation of operation at the time of non-energization of the solenoid valve, (a) is a longitudinal sectional view of the main part of the solenoid valve, (b) is a diagram schematically showing the flow path configuration of the solenoid valve (Example) 1). It is a schematic block diagram which shows an example of the hydraulic system to which the spool valve of this invention is applied as a solenoid valve for hydraulic control.

 Hereinafter, the best mode for carrying out the present invention will be described in detail according to embodiments shown in the drawings. In the drawings, the same reference numerals in the drawings indicate the same or equivalent parts, and redundant description is omitted in principle.

[Example 1]
In the present embodiment, as a typical application example of the spool valve, a solenoid valve for hydraulic control (linear solenoid type solenoid valve) that has been particularly awarded for the hydraulic system of an automatic transmission for automobiles is shown. The positioning of the valve in the automatic transmission will be outlined with reference to FIG.

As shown in FIG. 5, a hydraulic system 100 in an automatic transmission includes an oil pump 101 that serves as a fluid supply source, a manual valve 102, a linear solenoid electromagnetic valve 103, a clutch mechanism 104 to be controlled, a hydraulic pipe 105, and the like. including.
The oil pump 101 pumps oil from an oil tank (for example, an oil pan that forms a drain) 106 of an engine or an automatic transmission through a filter 107 and supplies the oil to a manual valve 102 through a hydraulic pipe 105.
The manual valve 102 selects a P (parking), R (reverse), N (neutral), or D (drive) mode by operating a select lever (not shown).
A linear solenoid type solenoid valve (hereinafter abbreviated as a solenoid valve) 103 controls the communication state of the oil supply oil passage to the clutch mechanism 104 when the D mode is selected, and adjusts the oil supply pressure. The electromagnetic valve 103 includes a spool valve mechanism 1 and a linear solenoid 2 as an actuator for driving the spool valve mechanism 1. For example, the electromagnetic valve 103 is installed in a vehicle by being installed in an oil tank 106 so that its axis is horizontal. The

[Basic configuration of solenoid valve 103]
Next, a specific structure of the electromagnetic valve 103 will be sequentially described with reference to FIG.
In FIG. 1, the upper and lower parts of the figure indicate the sky direction and the ground direction when the vehicle is mounted.

  As described above, the electromagnetic valve 103 is roughly divided into two components, that is, a spool valve mechanism 1 and a linear solenoid 2 that drives the spool valve mechanism 1. As a basic configuration, a sleeve 3, a spool 4, a spring 5, and a cap 6 are provided.

The sleeve 3 has a cylindrical shape as a whole and constitutes a valve housing, and is formed of a nonmagnetic metal material such as an aluminum alloy. The sleeve 3 has four oil ports 71 to 74 and one breathing hole 75 as a plurality of ports 7 penetrating in the radial direction.
The four oil ports 71 to 74 communicate with the oil pump 101 via the manual valve 102, and supply the oil to the clutch mechanism 104 and supply the oil to the clutch mechanism 104, in addition to the output port 72 also called a control port. The drain port 73 communicates with the drain (oil tank 106) and is also called a discharge port, and the feedback port 74 communicates with the output port 72.
Note that the breathing hole 75 is for opening the storage chamber 9 of the spring 5 to the outside and preventing the indoor pressure from fluctuating due to the volume fluctuation of the storage chamber 9.

The spool 4 has a columnar shape as a whole, and constitutes a valve body that cooperates with the sleeve 3 of the valve housing, and is formed of a nonmagnetic metal material such as an aluminum alloy. The spool 4 is accommodated in the sleeve 3 so as to be slidable in the axial direction, and is accurately fitted to the inner peripheral surface of the sleeve 3 via a predetermined fitting clearance.
The spool 4 has a plurality of lands 8 that partition between the plurality of oil ports 7. In the illustrated example, three lands of an input port portion land 81, a drain port portion land 82, and a feedback port portion land 83 are provided so as to correspond to the input port 71, the drain port 73, and the feedback port 74, respectively. .
The spool 4 is in communication between the ports 71 to 74 depending on the relative position (axial displacement) with the sleeve 3, that is, between the input port 71 and the output port 72 and between the output port 72 and the drain port 73. The communication state between each is controlled.

  The spring 5 has a biasing force that presses the spool 4 toward one side (linear solenoid 2 side) in the axial direction, and biases a member that limits the amount of movement of the spool 4 in the axial direction by a balance action with the electromagnetic force of the linear solenoid 2. It is represented by a compression coil spring. The spring 5 is housed and held in a storage chamber 9 formed between the spool 4 and the cap 6, one end abuts on the end surface of the spool 4 opposite to the linear solenoid 2, and the other end abuts on the cap 6. ing.

  The cap 6 is an adjustment member that is also referred to as an adjustment screw, and is attached to the end of the sleeve 3 via a screw adjustment mechanism 10. The axial position of the cap 6 with respect to the sleeve 3 is changed by changing the screwing amount (axial tightening length) of the screw adjusting mechanism 10, and the urging force (mounting load) of the spring 5 is adjusted steplessly ( Can be adjusted).

  To supplement the structure on the side of the linear solenoid 2 that constitutes the drive mechanism, the linear solenoid 2 includes a solenoid coil 11, a fixed core 12, a plunger (movable core) 13, and a shaft 14 as basic components. Yes.

  The solenoid coil 11 has a cylindrical shape. When the solenoid coil 11 is energized, the solenoid coil 11 generates a magnetic force and excites the fixed core 12, thereby causing the plunger 13 formed in a columnar shape with a magnetic metal material such as iron to spring 5. Drive against the urging force of.

  The shaft 14 is interposed between the spool 4 and the plunger 13. The spring 5 biases the spool 4 toward the shaft 14, so that one end of the shaft 14 contacts the end surface of the spool 4 and the other end of the shaft 14 contacts the end surface of the plunger 13.

[Features of Example 1]
Here, the present invention is mainly characterized by a specific combination mechanism of the port 7 of the sleeve 3 and the land 8 of the spool 4. The first embodiment of the mechanism will be further described in detail with reference to FIGS. 1 and 2.

As described above, the sleeve 3 has four oil ports 71 to 74 as a plurality of ports 7 penetrating in the radial direction, and each port surrounds the outer periphery of the spool 4 on the inner peripheral side of the sleeve 3. With an annular groove 15 that opens.
Each port is arranged in the order of the output port 72, the input port 71, the feedback port 74, and the drain port 73 with respect to the sleeve 3 from left to right in the axial direction.
Therefore, the input port 71 and the output port 72 are adjacent to each other, and the feedback port 74 and the drain port 73 are sequentially arranged on the opposite side (opposite side) of the output port 72 with respect to the input port 71. .

  Furthermore, the sleeve 3 is provided with a pressure accumulating chamber 20 between the input port 71 and the feedback port 74 on the drain port 73 side. The pressure accumulating chamber 20 is formed as an annular recess that opens only on the inner peripheral side of the sleeve 3, and surrounds the outer periphery of the spool 4.

On the other hand, as described above, the spool 4 is fitted into the inner peripheral surface of the sleeve 3 with high accuracy, and the four oil ports 71 to 74 are divided to control the communication state between the ports. -83 are provided.
The lands 81 to 83 are arranged with respect to the spool 4 in the order of the input port portion land 81, the feedback port portion land 83, and the drain port portion land 82 from the left to the right in the axial direction.
Therefore, the input port land 81 is located on both axial sides of the annular groove 15 of the input port 71 with respect to the inner peripheral surface of the sleeve 3, and the feedback port land 83 is an annular groove of the feedback port 74. 15, the land portion located on the linear solenoid side, and the drain port portion land 82 are configured to slide with the land portions located on both axial sides of the annular groove 15 of the drain port 73.

  The three lands 81 to 83 are provided with annular aligning grooves 16, 17, and 18, respectively. Further, the output port 72 and the feedback port 74 are communicated with each other by a hydraulic path 19 of a portion (for example, a transmission housing) H to which the electromagnetic valve 103 is attached, and fluctuations in hydraulic pressure sent from the output port 72 to the control target are suppressed. It has a structure.

The pressure accumulation chamber 20 provided in the sleeve 3 is provided closer to the input port 71 side than the feedback port 74 due to the axial length of the land portions on both sides in the axial direction. It is close. In the relationship with the outer peripheral surface of the spool 4, the pressure accumulating chamber 20 has a basic configuration that substantially opposes the outer peripheral surface of the input port land 81 (surface sandwiching the alignment groove 16).
Therefore, although the pressure accumulating chamber 20 is easily communicated with the input port 71, the outer peripheral side of the input port land 8a is fitted with the outer peripheral surface of the spool 4 and the inner peripheral surface of the sleeve 3 with high precision. The input port 71 communicates through a slight gap (fitting clearance) formed at the bottom. In the present embodiment, in order to promote this communication state, the input port land 81 is provided with a pressure accumulating chamber communication groove 21 extending in the axial direction toward the input port 71 in a part of the alignment groove 16. The gap (fitting clearance) is locally expanded.

[Operation of solenoid valve 103]
Next, the operation of the electromagnetic valve 103 having the above configuration will be described.
Here, a notable action related to the central function of the present invention will be described with reference to FIGS.

  When the solenoid coil 11 of the linear solenoid 2 is energized, the solenoid coil 11 generates a magnetic force according to the energization amount and drives the plunger 13 in the left direction in FIG. 1 against the urging force of the spring 5. Thereby, the plunger 13 starts to drive the spool 4 in the left direction in FIG. 1 via the shaft 14 and moves the spool 4 to the position shown in FIG. 3A at the maximum.

In the state shown in FIG. 3A, the related flow paths are set as follows.
In other words, the effective axial width (land width) of the input port land 81 that divides the input port 71 and the output port 72 of the sleeve 3 is increased, and the distance between the input port 71 and the output port 72 is substantially increased. On the other hand, during this energization, the required hydraulic pressure of the controlled object (clutch mechanism 104) is low, so that the feedback port land 83 expands the opening area on the linear solenoid 2 side (land width). The feedback port 74 and the drain port 73 are set to be substantially in a circulation state (in short, a drain state).
Therefore, when the resistances of the related flow paths in the energized state are compared in three stages of large, medium, and small, the flow resistance between the input port 71 and the output port 72 is “ R1 ”, the flow resistance between the feedback port 74 and the drain port 73 is“ R2 ”, and the flow resistance between the pressure accumulation chamber 20 and the input port 71 or the feedback port 74 is“ R3 ”or“ R4 ”, respectively. , “R1, R4” is “large”, “R3” is “medium”, and “R2” is “small”.

  In the energized state shown in FIG. 3, the oil pressure of the input port 71 becomes relatively high because oil hardly flows from the input port 71 to the output port 72. For this reason, foreign matter that has entered the input port 71 together with oil (for example, having a size of several tens of microns) is fitted hydraulically and pressed against the clearance (gap), and both sides of the input port 71 in the axial direction (annular groove 15). The event of biting occurs at the edge portion).

In the present embodiment, the pressure accumulation chamber communication groove 21 is provided even when the spool 4 moves to the left most, so that the flow path resistance R3 between the input port 71 and the pressure accumulation chamber 20 is substantially reduced. "Middle" close to "."
As a result, oil easily flows from the input port 71 to the pressure accumulating chamber 20 as indicated by an arrow X in FIG. 3B, and the oil pressure between the input port 71 and the pressure accumulating chamber 20 is immediately equalized. Due to this pressure equalizing effect, high-pressure (same pressure as the input port 71) oil can be stored (accumulated) in the accumulator 20 while reducing biting on the accumulator 20 side (feedback port 74 side).

  The pressure accumulating chamber 20 communicates with a small gap (fitting clearance) between the sleeve 3 and the spool 4 even though the flow path resistance R4 between the feedback port 74 (and the drain port 73) is “large”. Therefore, the air that enters the pressure accumulating chamber 20 from the input port 71 together with the oil escapes to the feedback port 74 side through the gap. Therefore, only the oil can be effectively stored in the pressure accumulating chamber 20, and there is no situation where the pressure accumulating chamber 20 is filled with bubbles and the pressure accumulating effect is reduced.

  The output port 72 communicates with the feedback port 74, and the flow resistance R2 between the feedback port 74 and the drain port 73 is also “small”. Therefore, the oil leaked from the input port 71 to the output port 72 is The drain port 73 is surely discharged via the feedback port 74, and an unintended hydraulic pressure does not act on the controlled object.

  Next, after energizing the solenoid coil 11 of the linear solenoid 2 after the operation shown in FIG. 3 described above, the spool 4 starts to move rightward in the drawing by the urging force of the spring 5 and moves to the rightmost side. FIG. 4 (a) shows the state when this is done.

In this state, since the effective axial direction width (land width) of the input port land 81 that divides the input port 71 and the output port 72 of the sleeve 3 is small, the gap between the input port 71 and the output port 72 is The communication state is substantially established (“R1 = small”). At this time, the oil easily flows out to the output port 72 and the hydraulic pressure of the input port 71 becomes low. Therefore, a situation occurs in which the hydraulic pressure of the pressure accumulating chamber 20 is higher than the hydraulic pressure of the input port 71 for a short time. .
The following difference can be caused by this pressure difference.

  That is, in this state, the pressure accumulation chamber communication groove 21 is located in the pressure accumulation chamber 20, and practically does not function as a communication path. Therefore, the flow path resistance R3 is between the input port 71 and the pressure accumulation chamber 20. Although it is also “large”, the sleeve 3 and the input port side land 81 communicate with each other via a fitting clearance (gap). For this reason, the oil stored in the pressure accumulating chamber 20 flows out to the input port 71 side vigorously through the fitting clearance (gap) due to the pressure difference, and at this time, the entire input port side land 81 is completely discharged. An axial oil flow is generated as indicated by an arrow Y over the outer periphery. This makes it possible to forcibly discharge the foreign matter biting into the feedback port 74 side in the annular groove 15 of the input port 71 to the output port 72 side together with the flow.

  Incidentally, in the state shown in FIG. 4A, the resistances R1 to R4 of the related flow paths are R1 only “small” and the remaining R2 to R4 are all “large”.

  Thus, even when a foreign object is caught between the sleeve 3 and the spool 4, the fluid stored in the pressure accumulating chamber 20 is forcibly discharged from the input port 71 side to the output port 72 side. The electromagnetic valve (spool valve) 103 which can be removed and is excellent in performance can be provided.

[Effect of Example 1]
According to the present invention according to the first embodiment described above, the following operational effects can be obtained.

(1) Since the pressure accumulation chamber 20 that communicates with the input port 71 is provided between the input port 71 and the feedback port 74 on the drain port 73 side, the energization that causes the input port 71 and the output port 7 to be disconnected. Sometimes the oil from the input port 71 can be accumulated in the pressure accumulating chamber 20 and accumulated.
(2) In particular, the input port land 81 that divides the input port 71 and the pressure accumulating chamber 20 is provided with the pressure accumulating chamber communication groove 21 that promotes the communication state between the input port 71 and the pressure accumulating chamber 20. The hydraulic pressure in the pressure accumulating chamber 20 is equalized at an early stage, and the pressure in the accumulating chamber 20 is increased (same as that of the input port 71) while reducing the biting of foreign matter on the pressure accumulating chamber 20 side (feedback port 74 side) of the input port 71. Pressure) oil can be stored.
(3) When the non-energized state in which the input port 71 and the output port 72 are switched to the communication state, the oil stored in the pressure accumulating chamber 20 flows out to the input port 71 side. In particular, it is possible to forcibly discharge the foreign matter biting into the feedback port 7d side to the output port 72 side along with the flow.
(4) Thus, it is possible to provide an electromagnetic valve 103 capable of forcibly discharging foreign matter with oil stored in the pressure accumulating chamber 20 even when foreign matter is caught between the sleeve 3 and the spool 4. Can do.
(5) Moreover, since the pressure accumulation chamber 20 is simply provided in the sleeve 3 and the pressure accumulation chamber 20 itself can be easily formed as an annular recess, it can be provided at low cost.
(6) Thus, even if high performance (high accuracy) is pursued in terms of performance, it is possible to provide a useful solenoid valve 103 that is excellent in both performance and cost.

[Other Embodiments; Modifications]
Although the present invention has been described in detail with reference to one embodiment, various modifications can be made without departing from the spirit of the present invention, and modifications thereof are illustrated as other embodiments.

(1) In this embodiment, an example in which the control of the communication state between the input port 71 and the output port 72 is set to the shut-off state when energized and the communication state when de-energized is described. On the other hand, when the arrangement of the linear solenoid 2 and the spring 5 is reversed left and right, the operation at the time of energization / non-energization can be reversed.

(2) In the present embodiment, the oil port is applied to a type in which the feedback port 74 that suppresses the pressure fluctuation on the output port 72 side is specially provided. However, the oil port is a type that does not have a feedback control function by the feedback port 74. Of course, the drain port 73 can be directly arranged on the side opposite to the input port of the pressure accumulating chamber 20 to be similarly applied.

(3) Further, in this embodiment, the pressure accumulation chamber communication groove 21 is positively provided. However, depending on the degree of promoting the communication state between the input port 71 and the pressure accumulation chamber 20, the flow of the pressure accumulation chamber communication groove 21 is increased. Various kinds of channel areas, channel lengths, and the like can be selected. If no such promotion is desired, the pressure accumulation chamber communication groove 21 may be omitted.

(4) In the above embodiment, as an application example of the spool valve of the present invention, the hydraulic control electromagnetic valve 103 in the hydraulic system 100 of the automatic transmission for an automobile is illustrated. In addition to this, for example, the present invention can be similarly applied to an electromagnetic valve for hydraulic control incorporated in a valve timing adjusting device.
(5) In addition to the electromagnetic force, a reciprocating drive mechanism that converts a rotational motion such as a motor into a linear motion can be adopted as the drive mechanism of the spool 4.
(6) The spool valve of the present invention can be widely used as a control valve for controlling the flow rate and pressure for various fluids such as water other than oil.

  The features and effects of the present invention that have been described in detail above will be summarized as follows according to each means described as a dependent claim in the scope of claims.

(Feature 1 = Means of claim 2)
In the spool valve (solenoid valve 103) according to claim 1,
In addition to the three ports (input port 71, output port 72, drain port 73), a plurality of ports 7 include a feedback port 74 communicating with the output port 72. The feedback port 74 is connected to the pressure accumulating chamber 20 and the drain. It is characterized by being disposed between the port 73 (see Example 1).
According to the above means, even in the solenoid valve 13 having the feedback control function by the feedback port 74, it is utilized for forcibly removing the foreign matter caught in the oil stored in the pressure accumulating chamber 20 without sacrificing the feedback control function. can do.

(Feature point 2 = Means of claim 3)
In the spool valve (solenoid valve 103) according to claim 1,
The input port land 81 that divides the input port 71 and the pressure accumulating chamber 20 is provided with a pressure accumulating chamber communication groove 21 that promotes communication between the input port 71 and the pressure accumulating chamber 20. The pressure accumulation chamber communication groove 21 is positioned in the pressure accumulation chamber 20 during the communication (see Example 1).
According to the above means, high pressure (same pressure as the input port 71) oil can be stored in the pressure accumulating chamber 20 while reducing the biting of foreign matter on the pressure accumulating chamber 20 side (feedback port 74 side) of the input port 71. it can.
When the oil stored in the pressure accumulating chamber 20 is caused to flow out, the function of the pressure accumulating chamber communication groove 21 is substantially stopped, and the input port 71 is moved from the axial direction over the entire outer periphery of the fitting clearance (gap). It is possible to generate an oil flow that flows out vigorously, and thus it is possible to forcibly discharge the caught foreign matter to the output port 72 side together with the flow.

(Feature point 3 = Means of claim 4)
In the spool valve (electromagnetic valve 103) according to any one of claims 1 to 3,
The spool valve (solenoid valve 103) is used as a hydraulic control electromagnetic valve 103 in the hydraulic system 100 of the automatic transmission for automobiles (see Example 1).
According to the above-described means, it is possible to contribute to further reduction in price and performance in an automatic transmission for an automobile, which is required to be reduced in price and performance.

  DESCRIPTION OF SYMBOLS 1 ... Spool valve mechanism, 2 ... Linear solenoid (drive mechanism), 3 ... Sleeve, 4 ... Spool, 5 ... Spring (biasing member), 7 ... Oil port (port), 20 ... Pressure accumulation chamber, 71 ... Input port, DESCRIPTION OF SYMBOLS 72 ... Output port, 73 ... Drain port, 101 ... Oil pump (fluid supply source), 103 ... Linear solenoid type solenoid valve (spool valve), 104 ... Clutch mechanism (control object), 106 ... Oil tank (drain)

Claims (4)

As the plurality of ports (7) penetrating in the radial direction, at least an input port (71) communicating with the fluid supply source (101), an output port (72) for supplying fluid to the controlled object (104), and a drain ( 106) a cylindrical sleeve (3) with a drain port (73) communicating with it;
The sleeve (3) is slidably disposed in the axial direction, and is displaced between the input port (71) and the output port (72) and the output port (72) and the drain by axial displacement. A spool (4) for controlling the communication state with the port (73),
A drive mechanism (2) for driving the spool (4) in one axial direction;
In the spool valve (103) provided with a biasing member (5) for biasing the spool (4) in a direction against a driving direction by the driving mechanism (2),
The plurality of ports (7) are arranged in the axial direction in the order of an output port (72), an input port (71), and a drain port (73) with respect to the sleeve (3),
A pressure accumulation chamber (20) communicating with the input port (71) is provided between the input port (71) and the drain port (73),
A spool valve (103) for discharging the fluid stored in the pressure accumulating chamber (20) toward the input port (71) when the input port (71) and the output port (72) communicate with each other. . Spool valve (103) according to claim 1,
In addition to the three ports, the plurality of ports (7) include a feedback port (74) communicating with the output port (72),
The spool valve (103), wherein the feedback port (74) is disposed between the pressure accumulation chamber (20) and the drain port (73). Spool valve (103) according to claim 1 or claim 2,
The land (81) that partitions the input port (71) and the pressure accumulating chamber (20) has a pressure accumulating chamber communication groove (21) that promotes the communication state between the input port (71) and the pressure accumulating chamber (20). )
The spool valve (103), wherein the pressure accumulation chamber communication groove (21) is positioned in the pressure accumulation chamber (20) when the input port (71) communicates with the output port (72). In the spool valve (103) according to any one of claims 1 to 3,
The spool valve (103) is a linear solenoid electromagnetic valve (103) used for hydraulic control of an automatic transmission for automobiles.

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