JP2008267569A - Valve device with actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic hydraulic control valve having a filter structure in which constraints of a filtration area are limited by an easy assembly. <P>SOLUTION: A second electromagnetic hydraulic control valve 7 comprises a capped type filter 53 coated with a valve housing 13. The capped type filter 53 forms an input filtration part α which prevents foreign objects from passing after permitting oil passing, an output filtration part β, and an exhaust filtration part γ on each part covering an input port 31, an output port 32 and an exhaust port 33 and is fixed to the electromagnetic actuator 12 using its caulking nail 44x in a state covered by the valve housing 13. The three functions can be set-up with only a capped type filter 53 and as the caulking nail 44x is used, costs can be saved. The assembling is easy because strong caulking never causes damage. Filtration areas of each filtration part α, β, γ can be provided larger so that oil passing resistance (pressure drop) can be suppressed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a valve device with an actuator configured by coupling a valve portion (for example, a ball valve, a spool valve, etc.) and an actuator portion (for example, an electromagnetic actuator, etc.), and in particular, a port ( (Shaft end port or radial port) filter structure.

(First conventional technique: Conventional technique in which a shaft end filter is provided at a shaft end port)
An electromagnetic hydraulic control valve (an example of a valve device with an actuator) is known that combines a three-way valve (an example of a valve unit) that adjusts an output hydraulic pressure and an electromagnetic actuator (an example of an actuator unit) that drives the three-way valve. (For example, refer to Patent Document 1).

The electromagnetic hydraulic control valve disclosed in Patent Document 1 will be described with reference to FIGS. In addition, a common code | symbol is attached | subjected and demonstrated to Example 1 mentioned later and a common function thing.
This electromagnetic hydraulic control valve is a combination of a three-way valve 11 that adjusts the communication state of an input port 31, an output port 32, and a discharge port 33, and an electromagnetic actuator 12 that drives the three-way valve 11.
The input port 31 disclosed in Patent Document 1 is a shaft end port provided to open at the shaft end of the valve housing 13 having a substantially cylindrical shape, and oil (an example of fluid) pumped from the oil pump is It flows from the input port 31 into the three-way valve 11.

In order to prevent foreign matter mixed in the oil from entering the valve housing 13 via the input port 31, a shaft end filter J1 that also serves as a spring seat is attached to the input port 31.
A shaft end filter J1 shown in Patent Document 1 is a mesh-structured mesh J2 molded into a resin member forming a spring holding portion J3. After being inserted into the input port 31, the shaft end filter J1 is formed at the end of the valve housing 13. The formed crimping claw J4 (thin wall portion) is fixed by crimping the spring holding portion J3.

(First problem)
Since the oil filtration area in the shaft end filter J1, that is, the opening area inside the spring holding portion J3 is regulated by the inner diameter of the opening inside the spring holding portion J3, there is a problem that the filtration area in the shaft end filter J1 is reduced. is there.
Since the spring holding portion J3 forming the spring seat is formed of resin, a resin molding burr (resin film) may be generated in the opening of the spring holding portion J3. As a result of the occurrence of resin molding burrs, the filtration area of the shaft end filter J1 is further reduced.

  Since the shaft end filter J1 is fixed by caulking the crimping claw J4 formed at the end of the valve housing 13 to the spring holding part J3, the caulking load is narrow so that the resin spring holding part J3 is not damaged. Therefore, it is necessary to set a high machining accuracy. When the caulking load is smaller than the appropriate load, the shaft end filter J1 is easily detached, and a gap is formed between the outer periphery of the shaft end filter J1 and the valve housing 13, and foreign matter enters the valve housing 13 from the gap. there is a possibility. On the contrary, if the caulking load is larger than the appropriate load, the spring holding portion J3 is cracked and the shaft end filter J1 is damaged.

(Second conventional technique: Conventional technique in which a radial filter is provided in a radial port)
On the other hand, there is a need to provide a radial filter at the output port 32 and the discharge port 33 (radial port) that open in the radial direction of the valve housing 13.
As described above, when the radial filter is attached to the output port 32 and the discharge port 33, the radial filter moves in the axial direction only by covering the valve housing 13 with the radial filter only provided in the cylindrical shape. .
Therefore, a technique is known in which an annular groove (or a rib sandwiching the filter) for restricting the axial movement of the radial filter is formed in the valve housing 13, and a belt-like radial filter is wound around and mounted in the annular groove. (For example, refer to Patent Document 2).

  In Patent Document 2, as a technique for winding and mounting a band-shaped radial filter in an annular groove, (1) a stat (protruding engagement portion) is provided in the annular groove in advance, and one of the radial filters is provided. The engagement hole formed at the band end is fitted into the stat in the annular groove, the radial filter is then wound into the annular groove, and the engagement hole formed at the other band end of the radial filter is subsequently attached to the stat. (2) A technique in which a radial filter is wound around the valve housing 13, and the overlapping portion of the band end of the radial filter is joined by spot welding or the like while being wound, (3) retained in the radial filter A technique is disclosed in which a resin frame is provided in advance, a radial filter is mounted in the annular groove, and the radial filter is held in the annular groove by the restoring force of the resin frame.

(Second problem)
As described in (1) above, the technique of providing filter fixing means such as a stat in the annular groove increases the manufacturing cost of the valve housing 13 by providing filter fixing means such as a stat in the valve housing 13. End up.
As shown in (2) above, the technique of spot welding the overlapping portions of the radial filter band ends while maintaining the state in which the radial filter is wound around the valve housing 13 is difficult to perform the welding operation. Inferiority.

As shown in (3) above, the technique of providing the holding resin frame on the radial filter generates a radial thickness of the resin frame, so that the valve housing 13 requires a radial frame mounting space. become. In other words, the provision of the frame in the radial filter prevents the valve housing 13 from being reduced in diameter.
As described above, when the radial filter is attached to the output port 32 and the discharge port 33 of the valve housing 13, in the related art, it is necessary to wrap the radial filter around the valve housing 13. Various problems have occurred.

(Third problem)
Further, when the shaft end filter J1 and the radial filter are attached to the input port 31 (shaft end port), the output port 32, and the discharge port 33 (radial port), respectively, the above first and second problems are caused. In addition, since the shaft end filter J1 and the radial filter are separately assembled, the number of parts and the number of assembling steps are increased, leading to an increase in manufacturing cost of the electromagnetic hydraulic control valve.
JP 2005-207545 A JP 2006-22816 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a valve device with an actuator having a filter structure with a small filter area restriction and easy assembly.

[Means of claim 1]
A cap-type filter in a valve device with an actuator that employs the means of claim 1 includes a filtering portion at a portion covering a port, and the actuator is connected to the valve housing by a coupling means provided in the actuator portion. It is fixed to the part.
Since the cap type filter is placed on the valve housing and fixed to the actuator part, the range of the filtration part (filtration area) is limited, and the passage resistance (pressure loss) of the fluid passing through the cap type filter is reduced. Can be suppressed.
Further, since the cap type filter is fixed using a coupling means provided in the actuator section, it is not necessary to provide a dedicated means for fixing the cap type filter, and the manufacturing cost can be reduced.

[Means of claim 2]
The actuator portion of the valve device with an actuator that employs the means of claim 2 is an electromagnetic actuator including a yoke that covers a coil that generates a magnetic force when energized, and the coupling means is a crimping claw formed at the end of the yoke. .
Thereby, a cap type filter can be fixed using the crimping claw (an example of a coupling means) provided in an actuator part.

[Means of claim 3]
The cap-type filter of the valve device with an actuator that employs the means of claim 3 is made of a thin metal plate formed in a shape that covers the valve housing, and the filtering portion is provided by a large number of holes formed in the thin metal plate. .
As a result, the cap-type filter component can be provided with only one thin metal plate, and the cost can be reduced.
Also, when the coupling means for fixing the cap type filter is the caulking claw of the actuator part, even if the cap type filter is strongly caulked by the caulking claw, there is no problem that the cap type filter is damaged, and the caulking fixing of the cap type filter It can be easily implemented.

[Means of claim 4]
The valve housing of the valve device with an actuator employing the means of claim 4 has a substantially cylindrical shape.
The port covered with the filtering part is a shaft end port that opens at the axial end of the valve housing, and the filtering part that covers the shaft end port is the fluid that flows into the shaft end port or the shaft end port. It is a shaft end filtration part which filters the fluid which flows out.
That is, according to the fourth aspect of the present invention, the present invention is applied to a shaft end filter for filtering the shaft end port, and a cap-type filter having a function of a shaft end filter can be easily assembled. In addition, the resin spring holding part can be eliminated, the filtration area of the shaft end filtration part is not limited by the opening area of the spring holding part, the filtration area of the shaft end filtration part can be provided large, and the shaft end port flows. Fluid passage resistance (pressure loss) can be suppressed.

  Furthermore, when combined with Claims 2 and 3, even if the cap type filter that performs the function of the shaft end filter is strongly caulked by the caulking claw of the actuator part, the cap type filter is not damaged and can be fixed easily. Can be implemented. That is, the first problem shown in the prior art can be avoided.

[Means of claim 5]
The valve housing of the valve device with an actuator employing the means of claim 5 has a substantially cylindrical shape.
The port covered with the filtration part is a radial port that opens in the radial direction of the valve housing, and the filtration part covering the radial port flows out of the fluid flowing into the radial port or out of the radial port. It is a radial direction filtration part which filters the fluid to do.
That is, according to the fifth aspect of the present invention, the present invention is applied to a radial filter for filtering a radial port, and a cap-type filter having a function of a radial filter can be easily assembled.

Since the cap type filter having the function of the radial filter is fixed by the coupling means (for example, caulking claw) of the actuator part, the cap type filter placed on the valve housing is moved in the axial direction from the opening position of the radial port. There is no gap. That is, the portion that functions as the radial filter does not shift in the axial direction. Further, it is not necessary to wrap and fix the valve housing. Thus, the second problem shown in the prior art can be avoided.
Further, when combined with the means of claim 4, the shaft end filter and the radial filter are only one cap type filter, and the manufacturing cost can be suppressed by reducing the number of parts and the number of assembling steps. That is, the third problem shown in the prior art can be avoided.

[Means of claim 6]
A circumferential groove extending in the circumferential direction in which the outer opening of the radial port opens in the groove is provided on the outer peripheral surface of the valve housing in the valve device with an actuator employing the means of claim 6. And a radial direction filtration part is provided in strip | belt shape in the circumferential direction along the circumferential groove | channel.
Thereby, the substantial filtration area of a radial direction filtration part can be enlarged, and the passage resistance (pressure loss) of the fluid which flows through a radial direction port can be suppressed.

The valve device with an actuator of the best mode includes a valve portion having a valve housing in which a shaft end port and a radial port through which oil (an example of fluid) can pass, and an electromagnetic actuator (actuator portion) that drives the valve portion Example).
This electromagnetic actuator includes a caulking claw (an example of a coupling means) that couples components (for example, a yoke and a magnetic plate) constituting the electromagnetic actuator or couples a valve housing and the electromagnetic actuator.
The valve device with an actuator according to the best mode includes one cap-type filter that covers the valve housing while covering the shaft end port and the radial port.
This cap type filter functions as both a shaft end filter for filtering the shaft end port and a radial filter for filtering the radial port, and allows oil to pass through the portion covering the shaft end port. And a shaft end filtering portion that prevents foreign matter from entering, and a portion that covers the radial port includes a radial filtering portion that allows oil to pass therethrough and prevents foreign matter from entering.
The cap type filter is made of a single sheet metal formed in a shape that covers the valve housing, and the shaft end filtration part and the radial direction filtration part are provided by a plurality of holes in the sheet metal, In the covered state, it is crimped and fixed by a crimping claw of the electromagnetic actuator.

A first embodiment in which the valve device with an actuator of the present invention is applied to two electromagnetic hydraulic control valves that perform hydraulic control will be described.
In the first embodiment, the “basic structure of the main part of the hydraulic control device” will be described first, and then “features of the first embodiment” will be described.

[Basic structure of hydraulic control unit]
The basic structure of the main part of the hydraulic control device will be described with reference to FIG. FIG. 3 illustrates the basic structure, and shows the first and second electrohydraulic control valves 6 and 7 shown in FIG. 3 to which the present invention is not applied.
The hydraulic control apparatus according to this embodiment includes a hydraulic controller that performs hydraulic control in an automatic transmission of an automobile.

  As shown in FIG. 3, the hydraulic controller shown in this embodiment includes a spool valve 1 that performs oil path switching control. This spool valve 1 is a well-known one in which a spool 3 for switching an oil passage is disposed inside a shaft hole (sliding hole) 2 formed in a case of a hydraulic controller. The spool 3 is urged in one direction (downward in FIG. 3) by the action of the return spring 4, and the end of the spool 3 on the side different from the return spring 4 (downward in FIG. 3) and the case of the hydraulic controller As the hydraulic pressure of the pilot chamber 5 formed between the two increases, the spool 3 is driven against the urging force of the return spring 4.

  The hydraulic pressure in the pilot chamber 5 is controlled by the first electromagnetic hydraulic control valve 6. The first electro-hydraulic control valve 6 is assembled to the case of the hydraulic controller, generates a driving hydraulic pressure in the pilot chamber 5 when energized, and discharges the driving hydraulic pressure in the pilot chamber 5 when energization is stopped. (Normally low) type. The first electrohydraulic control valve 6 has basically the same structure as a second electrohydraulic control valve 7 which will be described later. The detailed structure of the second electrohydraulic control valve 7 will be described.

In the hydraulic controller of this embodiment, even if the first electromagnetic hydraulic control valve 6 is energized and the driving hydraulic pressure is supplied to the pilot chamber 5, the second electromagnetic hydraulic pressure that positions the spool 3 below in FIG. A control valve 7 is mounted.
The second electromagnetic hydraulic control valve 7 controls the hydraulic pressure of the spring chamber 8 in which the return spring 4 is disposed. The second electromagnetic hydraulic control valve 7 is assembled to the case of the hydraulic controller, generates a drive hydraulic pressure in the spring chamber 8 when energized, and discharges the drive hydraulic pressure in the spring chamber 8 when energization is stopped. Of the type. The second electromagnetic hydraulic control valve 7 is energized to increase the hydraulic pressure of the spring chamber 8, so that the first electromagnetic hydraulic control valve 6 is driven by the hydraulic pressure supplied to the spring chamber 8 and the biasing force of the return spring 4. Regardless of the operation, the spool 3 is positioned below in FIG.

(Description of second electromagnetic hydraulic control valve 7)
Next, the second electrohydraulic control valve 7 (an example of a valve device with an actuator) will be described with reference to FIG.
As described above, the second electromagnetic hydraulic control valve 7 is assembled to the case of the hydraulic controller, and includes a three-way valve (an example of a valve unit) 11 and an electromagnetic actuator (an example of an actuator unit) that drives the three-way valve 11. And 12).

(Description of the three-way valve 11)
An example of the three-way valve 11 will be described with reference to FIG.
The three-way valve 11 includes a valve housing 13, a ball valve (input side valve body) 14, a bleed valve (discharge side valve body) 15, a shaft 16, and the like.

The valve housing 13 has a substantially cylindrical shape, and is provided with a magnetic metal (iron or the like) so as to constitute a part of the stator of the electromagnetic actuator 12. Inside the valve housing 13, an input chamber 21, an output chamber 22, and a discharge chamber 23 are formed from the left side to the right side in FIG.
The input chamber 21 is configured by a space in which the ball valve 14 is disposed. The output chamber 22 is configured by a space sandwiched between an input-side partition wall (ball valve seat member) 24 and a discharge-side partition wall (bleed valve seat member) 25 fixed in the valve housing 13. The discharge chamber 23 is constituted by a space in the valve housing 13 on the right side of FIG.

  Each of the input-side partition wall 24 and the discharge-side partition wall 25 includes a vertical surface with respect to the axial direction (the movement direction of the shaft 16), and the vertical surfaces are arranged to face each other. An input valve port 26 that communicates the input chamber 21 and the output chamber 22 is provided at the center of the input side partition wall 24. A discharge valve port 27 that communicates the output chamber 22 and the discharge chamber 23 is also provided at the center of the discharge-side partition wall 25. The input valve port 26 and the discharge valve port 27 are both provided on the axis of the shaft 16.

In the valve housing 13, an oil path is connected to the input port 31 to which oil (an example of fluid) pumped from the oil pump 28 (see FIG. 3) via the oil path or the like is input, and to the spring chamber 8 of the spool valve 1. And an output port 32 communicating with the low-pressure side such as in the oil pan, and a discharge port (drain port) 33 communicating with the low-pressure side.
The input port 31 communicates with the input chamber 21 and is opened at the axial end portion (left end in FIG. 1) of the valve housing 13. The output port 32 communicates with the output chamber 22 and is provided to open in the radial direction of the valve housing 13. The discharge port 33 communicates with the discharge chamber 23 and is provided to open in the radial direction of the valve housing 13.

  The ball valve 14 is a metal ball having a spherical shape, and is disposed in the input chamber 21. The ball valve is disposed in a compressed state inside the input chamber 21 and the hydraulic pressure supplied from the input port 31. A force for sitting on the input valve seat around the input valve port 26 is given by the biasing force of the spring 35. When the ball valve 14 is seated on the input valve seat, the input valve port 26 is closed, and the communication between the input chamber 21 and the output chamber 22 is blocked.

  The bleed valve 15 is formed on the shaft 16 in the discharge chamber 23, and is given a seating force on the discharge valve seat around the discharge valve port 27 by the driving force of the electromagnetic actuator 12. When the bleed valve 15 is seated on the discharge valve seat, the discharge valve port 27 is closed, and the communication between the output chamber 22 and the discharge chamber 23 is blocked.

The shaft 16 is made of a nonmagnetic metal having a substantially rod shape, and is supported so as to be slidable in the axial direction in a shaft hole 36 formed at the shaft center on the right side of the valve housing 13 in FIG. The shaft 16 has a movable element 42 (described later) of the electromagnetic actuator 12 fixed to the right side in FIG. 1 and moves integrally with the movable element 42.
Therefore, when the electromagnetic actuator 12 is energized and the mover 42 is positioned on the left side in FIG. 1, the tip of the shaft 16 separates the ball valve 14 from the input valve seat, and the input port 31 and the output port 32 are connected to the input valve. While communicating through the port 26, the bleed valve 15 is seated on the discharge valve seat to block communication between the output port 32 and the discharge port 33.
When the energization of the electromagnetic actuator 12 is stopped and the mover 42 is positioned on the right side of FIG. 1, the tip of the shaft 16 is buried in the input valve port 26 by the urging force of the input hydraulic pressure and the ball valve spring 35, and the ball The valve 14 is seated on the input valve seat to cut off the communication between the input port 31 and the output port 32, and the bleed valve 15 is seated away from the discharge valve seat so that the output port 32 and the discharge port 33 are connected via the discharge valve port 27. Communicate.

(Description of electromagnetic actuator 12)
An example of the electromagnetic actuator 12 will be described with reference to FIG.
The electromagnetic actuator 12 includes a coil 41, a mover 42, a shaft biasing spring 43, a yoke 44, a stator 45, a connector 46, and the like.

The coil 41 generates a magnetic force when energized to form a magnetic flux loop passing through the mover 42 and the magnetic stator (yoke 44 and stator 45). An insulating coating is provided around the resin bobbin. A large number of conducting wires (such as enameled wires) are wound.
The mover 42 is a magnetic metal (for example, a ferromagnetic material such as iron) having a substantially cylindrical shape, and is fixed to the right side of the shaft 16 in FIG.

  The shaft urging spring 43 is a compression coil spring that urges the movable element 42 in the valve opening direction (left direction in FIG. 1) and causes the tip of the shaft 16 to abut against the ball valve 14 even in a non-energized state. The movable element 42 is arranged in a compressed state between the right end face in FIG. 1 of the movable element 42 and a spring presser 47 fixed to the inside of the yoke 44. A breathing hole penetrating in the axial direction is formed at the center of the spring retainer 47.

The yoke 44 is a magnetic metal (e.g., a ferromagnetic material such as iron) having a substantially double cylinder. The yoke 44 is crimped by a caulking claw 44x formed with a thin wall at the opening end, which will be described later. The magnetic plate 52 is firmly coupled.
Specifically, the yoke 44 includes an outer peripheral yoke 44a that covers the outer periphery of the coil 41, an inner peripheral yoke 44b that covers the inner periphery of the coil 41 and the outer periphery of the mover 42, and an outer peripheral yoke 44a on the right side of the coil 41 in FIG. An annular yoke 44c that magnetically couples the inner peripheral yoke 44b is integrally provided. The inner peripheral yoke 44b covers the mover 42 in a non-contact manner, and performs radial magnetic transfer.

The stator 45 includes a small-diameter portion (portion inserted into the electromagnetic actuator 12) 51 on the right side of FIG. 1 of the valve housing 13 made of a magnetic metal (for example, a ferromagnetic material such as iron) and the small-diameter portion 51 of FIG. The magnetic plate 52 is press-fitted and fixed in contact with the leftmost step 51a.
The magnetic plate 52 is a substantially ring disk made of a magnetic metal (for example, a ferromagnetic material such as iron), and is caulked with the caulking claws 44x of the yoke 44 (specifically, the outer yoke 44a) as described above. Thus, it is fixed to the yoke 44 and is magnetically coupled to the yoke 44.
A small-diameter portion 51 of the valve housing 13 that forms part of the stator 45 is magnetically coupled to a magnetic plate 52 that is press-fitted into the outer periphery. The end face on the right side of FIG. 1 of the small diameter portion 51 faces the mover 42 in the axial direction and magnetically attracts the mover 42.

  The connector 46 is a connection means for making an electrical connection with an AT-ECU (electronic control unit for automatic transmission: not shown) via a connection line, and terminals connected to both ends of the coil 41 inside thereof. 46a is arranged.

[Features of Example 1]
In the features of the first embodiment, the “background of the first embodiment” will be described first, and then the “technology for solving the problem” will be described.

(Background of Example 1)
<Prior art shaft end filter>
The input port 31 is a shaft end port provided at the shaft end of the valve housing 13. The input port 31 is pressure-fed from the oil pump 28 and supplied with oil passing through an oil passage or the like. The oil supplied from the oil pump 28 to the input port 31 is clean oil filtered by an oil strainer or the like. However, there is a possibility that foreign matter (such as wear powder or burrs formed during manufacture and missing during use) existing in the oil supply path that communicates between the oil pump 28 and the input port 31 may be introduced to the input port 31.

Therefore, in order to prevent foreign matter mixed in the oil from entering the valve housing 13 from the input port 31, a shaft end filter J1 that also serves as a spring seat is provided in the input port 31, as shown in FIGS. It is attached.
The shaft end filter J1 of the prior art is formed by molding a mesh-structured mesh J2 into a resin member forming the spring holding portion J3, and is formed at the end of the input port 31 after being inserted into the input port 31. The crimping claw J4 (thin wall portion) was fixed by caulking the spring holding portion J3 (see Patent Document 1). However, the technique of fixing the shaft end filter J1 of the prior art in which the mesh J2 is molded with the resin spring holding portion J3 to the input port 31 with the caulking claw J4 has various problems as described above.

<Prior art radial filter>
On the other hand, the second electromagnetic hydraulic control valve 7 performs hydraulic control of the spring chamber 8 of the spool valve 1 as described above. For this reason, when the first electrohydraulic control valve 6 is energized while the energization of the second electrohydraulic control valve 7 is stopped, the volume of the spring chamber 8 decreases, and the second electrohydraulic control valve 7 Oil flows from the output port 32 toward the discharge port 33. However, when the energization of the first electrohydraulic control valve 6 is stopped while the energization of the second electrohydraulic control valve 7 is stopped, the volume of the spring chamber 8 increases and the second electrohydraulic control valve 7 is increased. The reverse flow phenomenon in which oil flows from the discharge port 33 toward the output port 32 occurs.

The oil that flows backward from the discharge port 33 toward the output port 32 is unfiltered oil that has not been filtered by an oil strainer or the like. For this reason, the foreign matter contained in the oil flowing from the discharge port 33 toward the output port 32 may enter the three-way valve 11 and cause the second electromagnetic hydraulic control valve 7 to malfunction.
Therefore, it is conceivable that a radial filter is attached to the outer periphery of the discharge port 33 to prevent foreign matters mixed in the oil from entering the inside of the three-way valve 11.

Even in the output port 32, the oil is returned from the spring chamber 8 side through the oil passage as the volume of the spring chamber 8 decreases. For this reason, foreign matter (abrasion powder or burrs formed during use and lost during use) flows into the output port 32 from the spring chamber 8 side into the spring chamber 8 and the oil passage communicating the spring chamber 8 and the output port 32. there's a possibility that.
For this reason, not only the discharge port 33 described above but also a radial filter may be attached to the outer periphery of the output port 32 to prevent foreign matters mixed in the oil from entering the inside of the three-way valve 11. is there.

However, the output port 32 and the discharge port 33 are radial ports that open in the radial direction of the valve housing 13, and the radial filter can be moved axially only by covering the valve housing 13 with a radial filter provided in a cylindrical shape. To the position of the output port 32 and the discharge port 33.
Therefore, a technique has been proposed in which an annular groove is formed in the valve housing 13 and a belt-shaped radial filter is wound around the annular groove and mounted (see Patent Document 2). However, the technique of winding and mounting a band-shaped radial filter in the annular groove has various problems as described above.

(Technology to solve problems)
The second electrohydraulic control valve 7 that solves the above problems will be described with reference to FIGS.
As described above, the second electromagnetic hydraulic control valve 7 includes the input port 31 (an example of a shaft end port) through which oil can pass, the output port 32 (an example of a radial port), and the discharge port 33 (an example of a radial port). ) Is formed, and a three-way valve (an example of a valve part) 11 having a valve housing 13 and an electromagnetic actuator (an example of an actuator part) 12 for driving the three-way valve 11 is provided. A crimping claw 44x (an example of a coupling means) for coupling the plate 52 (an example of a part constituting the electromagnetic actuator 12) is provided.

Further, the second electrohydraulic control valve 7 includes a cap-type filter 53 that covers the valve housing 13 while covering the input port 31, the output port 32, and the discharge port 33.
The cap-type filter 53 includes an input filtering unit α, an output filtering unit β, and a discharging filtering unit that allow the passage of oil and prevent the passage of foreign substances in the portions covering the input port 31, the output port 32, and the discharging port 33. γ is provided, and is fixed to the electromagnetic actuator 12 using a caulking claw 44x provided on the electromagnetic actuator 12 in a state of being covered with the valve housing 13.

An input filtering part α provided in a portion covering the input port 31 is a shaft end filtering part that filters oil supplied from the oil pump 28 to the input port 31 through an oil passage or the like, and functions as a shaft end filter.
An output filtering unit β provided in a portion covering the output port 32 is a radial filtering unit that filters oil returned from the spring chamber 8 through the oil path to the output port 32, and functions as a radial filter.
A discharge filtration part γ provided in a portion covering the discharge port 33 is a radial filter part that filters oil guided from the drain side (oil pan side) to the discharge port 33 through the oil passage, and functions as a radial filter. Fulfill.

On the outer peripheral surface of the valve housing 13, there is provided an output circumferential groove 54 extending in the circumferential direction in which the outer opening of the output port 32 opens in the groove, and the outer opening of the discharge port 33 opens in the groove. A circumferential groove 55 for discharge extending in the circumferential direction is provided.
On the other hand, the output filtering part β is provided in a ring band shape in the circumferential direction along the output circumferential groove 54, and the discharge filtering part γ is also provided in a ring band shape in the circumferential direction along the discharge circumferential groove 55. .
The groove width and the groove depth of the output circumferential groove 54 and the discharge circumferential groove 55 are not particularly limited as long as oil can easily flow in the circumferential direction in the groove covered with the cap-type filter 53. For example, the groove width is 3 to 8 mm, and the groove depth is about 0.8 to 5 mm.

The cap type filter 53 is formed in a shape that covers the valve housing 13. Specifically, the cap-type filter 53 includes a cylindrical portion 53a that covers the outer periphery of the valve housing 13, a disk portion 53b that covers the input port 31 at one end of the cylindrical portion 53a, and an outer diameter direction at the other end of the cylindrical portion 53a. And a flange portion 53c that is caulked to the caulking claw 44x.
The inner diameter dimension of the cylindrical portion 53a is substantially the same as the outer diameter dimension of the valve housing 13, and an extremely fine (0.1 mm or less) assembly clearance is formed between the valve housing 13 and the cylindrical portion 53a. The Thereby, the communication between each port by the clearance gap between the valve housing 13 and the cylinder part 53a is prevented.
The axial dimension of the cylindrical portion 53 a matches the axial dimension of the valve housing 13 exposed to the outside of the electromagnetic actuator 12.
The disk portion 53b also serves as a spring seat for the ball valve spring 35, and a step 53d for restricting the radial movement of the ball valve spring 35 is provided at a portion where the ball valve spring 35 is seated.

Each of the input filtering unit α, the output filtering unit β, and the discharge filtering unit γ is provided by a large number of holes 53 e formed in a thin metal plate that forms the cap-type filter 53. Each hole 53e allows passage of oil but prevents passage of foreign matter mixed in the oil, and is formed by a known technique such as laser irradiation or etching. The specific diameter of each hole 53e is a diameter that prevents passage of foreign substances and is difficult to clog. For example, the diameter is preferably in the range of 0.1 to 0.8 mm, and is 0.2 to 0.5 mm. The range is particularly preferred.
The cap-type filter 53 is provided with a thickness dimension that has low oil flow resistance and is not damaged by the oil flow or pressure. Specifically, when each hole 53e is formed by etching, the hole 53e is provided to a thickness (for example, in a range of 0.1 to 0.6 mm) that facilitates the formation of the hole 53e.

An example of a specific manufacturing method of the cap-type filter 53 is disclosed. First, a large number of holes 53e are formed by etching or the like before pressing, and then formed into the above-described shape that covers the valve housing 13 by pressing. It is what is done.
A specific method for assembling the cap-type filter 53 is as follows. Each functional component is assembled inside the valve housing 13 in which the magnetic plate 52 is coupled to the small-diameter portion 51 of the valve housing 13, and the cap-type filter 53 is put on the valve housing 13. The caulking claw 44x of the yoke 44 in which the coil 41 and the like are housed is caulked to the magnetic plate 52 together with the flange portion 53c of the cap type filter 53. Thereby, the three-way valve 11 and the electromagnetic actuator 12 are coupled, and the assembly of the cap-type filter 53 that functions as one shaft end filter and two radial filters is completed.

(Effect of Example 1)
The cap type filter 53 of the second electrohydraulic control valve 7 of the first embodiment is made of a sheet metal formed in a shape that covers the valve housing 13, and each of the filtering parts α, β, γ is formed of a sheet metal. Provided by a large number of holes 53e.
As a result, the three functions of the shaft end filter of the input port 31, the radial filter of the output port 32, and the radial filter of the discharge port 33 can be provided by only one cap-type filter 53 made of a thin metal plate. Can be suppressed.
Further, since the cap-type filter 53 is fixed by using the caulking claw 44x provided in the electromagnetic actuator 12, a dedicated means for fixing the cap-type filter 53 is unnecessary, and the manufacturing cost is reduced. be able to.
Further, the caulking claw 44x of the electromagnetic actuator 12 is used as a coupling means for fixing the cap type filter 53. However, even if the cap type filter 53 is strongly caulked by the caulking claw 44x, there is a problem that the cap type filter 53 is damaged. In addition, the cap-type filter 53 can be easily fixed by caulking.

Since the cap-type filter 53 is placed on the valve housing 13 and fixed by the caulking claw 44x of the electromagnetic actuator 12, the restrictions on the ranges (filtering areas) of the filtering portions α, β, and γ are small. For this reason, the passage resistance (pressure loss) of the oil in each filtration part (alpha), (beta), (gamma) can be suppressed.
Specifically, the range of the input filtering part α can be provided in a wide range (up to the inner diameter range of the input port 31) without being restricted by the spring holding part J3 shown in the prior art. Inflow resistance can be made smaller than that of the prior art.

  In addition, the valve housing 13 is provided with an output circumferential groove 54 and a discharge circumferential groove 55 communicating with the output port 32 and the discharge port 33, and an output filtering part β and a discharge filtering part γ are provided in a strip shape over the entire circumference. By providing the band width to be equal to or greater than the groove width (groove width of the output circumferential groove 54 and the discharge circumferential groove 55), the filtering is performed by providing the output port 32 and the discharge port 33 with the filtering parts β and γ. The increase in resistance can be suppressed, and the flow resistance of oil passing through the output port 32 and the discharge port 33 can be reduced.

[Modification]
In the above embodiment, the example in which the present invention is applied to the second electromagnetic hydraulic control valve 7 has been described. However, the present invention may be applied to the first electromagnetic hydraulic control valve 6 as well.
In the above embodiment, the clearance between the valve housing 13 and the cap-type filter 53 is reduced to prevent communication between the ports (between the input port 31 and the output port 32 and between the output port 32 and the discharge port 33). However, a seal member (such as an O-ring) may be provided to prevent communication between the ports.
In the above embodiment, an example in which the present invention is applied to an N / L type electromagnetic hydraulic control valve has been described. However, N / H (normally high) where the output is maximized in a state where energization of the electromagnetic actuator 12 is stopped. The present invention may be applied to a type of electromagnetic hydraulic control valve.

In the above embodiment, an example in which the present invention is applied to an electromagnetic hydraulic control valve used for hydraulic control of an automatic transmission has been shown. However, the present invention is applied to an electromagnetic hydraulic control valve that controls hydraulic pressure and oil flow rate other than in an automatic transmission. May be applied.
In the above embodiment, oil is shown as an example of the fluid, but a liquid or gas different from oil may be used. That is, the present invention may be applied to a valve device with an actuator that performs pressure regulation and metering of a fluid other than oil.

The structure of the three-way valve 11 shown in the above embodiment is an example for explaining the embodiment, and another three-way valve structure may be adopted.
In the above embodiment, the three-way valve 11 is shown as an example of the valve unit, but other valve structures such as a two-way valve (open / close valve) and a four-way valve may be used.
Furthermore, in the above embodiment, the ball valve 14 is used as an example of the valve portion, but other valve structures such as a spool valve may be used.
In the above embodiment, the cap type filter 53 is provided with the function of the shaft end filter and the function of the radial filter. However, the cap type filter 53 only has the function of the shaft end filter. Only the function of the direction filter may be provided to the cap type filter 53.

The structure of the electromagnetic actuator 12 shown in the above embodiment is an example for explaining the embodiment, and may be an electromagnetic actuator employing another structure.
In the above embodiment, the electromagnetic actuator 12 is used as an example of the actuator unit. However, a piezoelectric actuator using a piezoelectric stack, and an electric actuator that converts the rotation of the electric motor in the axial direction to drive the valve unit are used. Alternatively, a fluid actuator that drives the valve portion by hydraulic pressure or negative pressure may be used.

(Example 1) which is sectional drawing of an electrohydraulic control valve. It is the figure which looked at the cap type filter from the axial direction, and the perspective view of a cap type filter (Example 1). It is a principal part schematic of a hydraulic control apparatus. It is sectional drawing of an electrohydraulic control valve (conventional example). It is a perspective view of a shaft end filter (conventional example).

Explanation of symbols

7 Second electromagnetic hydraulic control valve (valve device with actuator)
11 Three-way valve (valve part)
12 Electromagnetic actuator (actuator part)
13 Valve housing 31 Input port (shaft end port)
32 Output port (Diameter port)
33 Discharge port (radial port)
41 Coil 44 Yoke (parts constituting the actuator part)
44x caulking nails (coupling means)
52 Magnetic plate (parts constituting the actuator part)
53 Cap-type filter 53e Hole 54 Output circumferential groove 55 Discharge circumferential groove α Input filtration part (shaft end filtration part)
β Output filtration part (Diameter filtration part)
γ discharge filtration part (diameter filtration part)

Claims (6)

A valve portion having a valve housing formed with a port through which a fluid can pass;
An actuator unit for driving the valve unit,
In the valve device with an actuator in which coupling means for coupling the parts constituting the actuator unit or coupling the valve housing and the actuator unit is provided in the actuator unit,
This valve device with actuator
A cap-type filter that covers the valve housing in a state of covering the port;
The cap-type filter includes a filtering portion that allows passage of fluid and prevents entry of foreign matter in a portion covering the port, and is fixed to the actuator portion in a state where the valve housing covers the valve housing. A valve device with an actuator. The valve device with an actuator according to claim 1,
The actuator unit is an electromagnetic actuator including a yoke that covers a coil that generates a magnetic force when energized.
The valve device with an actuator, wherein the coupling means is a crimping claw formed at an end portion of the yoke. In the valve device with an actuator according to claim 1 or 2,
The cap-type filter is a thin metal plate formed in a shape that covers the valve housing,
The valve device with an actuator, wherein the filtering part is provided by a number of holes formed in the thin metal plate. In the valve device with an actuator according to claim 1 to claim 3,
The valve housing has a substantially cylindrical shape,
The port covered with the filtration part is an axial end port that opens at an axial end of the valve housing;
The valve unit with an actuator, wherein the filtration part covering the shaft end port is a shaft end filtration part that filters the fluid flowing into the shaft end port or the fluid flowing out from the shaft end port. In the valve device with an actuator according to claim 1 to claim 4,
The valve housing has a substantially cylindrical shape,
The port covered with the filtration part is a radial port that opens in a radial direction of the valve housing;
The valve unit with an actuator, wherein the filtering part covering the radial port is a radial filtering part that filters a fluid flowing into the radial port or a fluid flowing out of the radial port. In the valve device with an actuator according to claim 5,
An outer circumferential surface of the valve housing is provided with a circumferential groove extending in a circumferential direction in which an outer opening of the radial port opens in the groove,
The valve device with an actuator, wherein the radial filtering section is provided in a band shape in the circumferential direction along the circumferential groove.

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