JPH01130210A - Pressure regulating valve - Google Patents

Abstract

PURPOSE:To improve the responsiveness of a movable part by forming an opening part in a part being in the vicinity of an electromagnet part of a valve sleeve and allowing the inside of the electromagnet part to communicate with the outside through said opening part. CONSTITUTION:The pressure regulating valve 1 is constituted of a relief valve part 2 and an electromagnet part 3. This pressure regulating valve 1 brings the relief valve part 2 to relief operation in accordance with an electric signal which has been inputted to said electromagnet part 3, and outputs fluid pressure. Also, at the time of its relief action, a volume variation which occurs in the inside by following up a movement of a movable part of the electromagnet part 3, and a volume variation by generated heat are allowed to escape to the outside through an opening part 42 which has been formed in a valve sleeve 5. Moreover, when a fluid flows through said opening part 42, it is obstructed that a foreign matter invades the inside, by a filtering action by a filter member 45 of the opening part 42. In such a way, a manufacturing cost of the pressure regulating valve 1 can be suppressed low.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a pressure regulating valve used in automatic transmissions installed in automobiles, and in particular to an electromagnetic pressure regulating valve that controls fluid pressure in accordance with an electric signal. The present invention relates to a valve, and more particularly to a communication structure between the inside and outside of an electromagnet portion thereof.

(B) Conventional technology As shown in Japanese Patent Laid-Open No. 59-37309, a conventional electromagnetic pressure regulating valve has a pressure regulating valve section, a coil/coil assembly inside a case, a core, and a plunger at one end. and a sealed electromagnet section in which a push rod is fixedly attached and biased toward the pressure regulating valve section by a spring and arranged concentrically from the outer circumferential side toward the center, and one end of the push rod is The push rod is supported by a plate spring which is held between the case and the pressure regulating valve part and has a through hole in the middle part, and the other end of the push rod is
It is slidably supported within a support bushing threaded onto the core.

(c) Problems to be Solved by the Invention Therefore, although the conventional pressure regulating valve described above can prevent foreign matter from entering from the outside into the electromagnet part based on its sealing structure, When the movable part of the electromagnet section, which is a rod, moves, there is no escape for the volume change that occurs within the electromagnet section, which not only deteriorates the responsiveness of the electromagnet section, but also causes a pressure change that occurs due to the volume change inside the electromagnet section. Alternatively, pressure changes within the electromagnet due to temperature changes may affect the pressure regulating valve.
This had the disadvantage of impairing pressure adjustment accuracy.

In order to solve the above-mentioned problems, we have also developed an opening that communicates the inside and outside of the electromagnet part in the case body circumference of the electromagnet part. Not only is it extremely difficult to select the location where the opening is to be made, but it is also necessary to provide a means to prevent foreign matter such as iron powder from entering the electromagnet from the outside through the opening and deteriorating the performance of the electromagnet. However, there was a drawback that the structure of the electromagnet part was even more complicated.

Therefore, the present invention is configured such that an opening that communicates the inside of the electromagnet with the outside is formed on the valve sleeve side, which is easy to process, and a filter member is disposed in the opening, thereby improving responsiveness and pressure adjustment. Pressure 1 with good accuracy and no risk of foreign matter entering the electromagnet from the outside! The purpose is to obtain a fair balance.

- Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances. For example, as shown in FIG. A pressure regulating valve (2) comprising a pressure regulating valve section (2) equipped with a spool valve (6) slidably accommodated, and an electromagnet section (3) connected to the pressure regulating valve section (2). In 1), openings (42), (42) are formed in a portion of the valve sleeve (5) close to the electromagnet part (3), and the electromagnet part (42) is inserted through the openings (42), (42).
The inside of 3) communicates with the entire outside, and the opening (42
), (42) is characterized in that a filter member (45) is disposed on the valve sleeve (5) so as to cover the valve sleeve (5).

(E) Function Based on the above configuration, the pressure regulating valve (1) operates the pressure regulating valve section (2) in response to an electric signal input to its electromagnet section (3).
) to perform pressure regulating operation and output fluid pressure corresponding to the input electrical signal. During the pressure regulating action, a volume change occurs inside the electromagnet (3) due to the movement of the movable part of the electromagnet (3), and a change in volume occurs inside the electromagnet (3) due to the operation of the electromagnet (3). The volume change due to heat is released to the outside through the openings (42), (42) formed in the valve sleeve (5), so that the movable part of the electromagnet (3) operates with good response. In addition, as a result of the volume change being released as described above, a pressure regulating valve section (
Since pressure changes that adversely affect the operation of 2) are no longer generated, a highly accurate pressure regulation action corresponding to the input signal is performed in the pressure regulating valve section (2). Further, the heat generated inside the electromagnet section (3) is transferred to the opening section (42).

It is cooled by fluid entering through (42) and dissipated to the outside by fluid exiting through the openings (42), (42). Furthermore, the opening (42),
(42) When fluid flows through the filter member (45) disposed in the openings (42), (42)
The filtration action of this prevents foreign matter from entering the electromagnet portion (3) from the outside.

(F) Examples Examples of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the pressure regulating valve 1 is composed of a pressure regulating valve section 2 and an electromagnet section 3.

The pressure regulating valve section 2 is composed of a valve sleeve 5 and a spool valve 6, and the valve sleeve 5 has a female screw hole 9 into which a spring adjustment plug 7 is screwed, and a female screw hole 9 into which the spool valve 6 is slid. A guide hole 10 for guiding, and a guide hole 11 located between the guide hole 10 and the female threaded hole 9 and having a smaller diameter than the guide hole 10 are formed penetrating through the center in the axial direction, The valve sleeve 5 has a discharge port 1-12, an output port 13, a supply port 15 in the radial direction of the outer circumference of the valve sleeve 5 corresponding to the guide hole 10, and a boundary portion between the guide hole 10 and the guide hole 11. Feedback ports 16 are respectively formed to open in the radial direction on the outer circumference thereof, and an annular cutout is formed as necessary to smooth the flow of fluid in each port. Further, the spool valve 6 has two land portions 17 and 19 having the same outer diameter that are closely slidably guided in the guide hole 10, and one land portion 1.
9 and a small-diameter land portion 20 closely slidingly guided in the small-diameter guide hole 11;
The distance between the adjacent ends of 7 and 19 is such that the output port 13 can be alternately communicated with the supply port 15 and the discharge port 12 at a predetermined ratio by sliding the spool valve 6, and 13 communicates with feedback port 16 via feedback path 14 and orifice 21 . Further, a spring 22 is compressed between one end of the spool valve 6 and the plug 7, and the spring 22 allows the pressure from the feedback port 16 to cooperate with the biasing force due to the difference in area between the land portions 19 and 20. The spool valve 6 is biased rightward in the figure. In addition, the first
In the figure, the protruding portion 23 formed at the center of the right end surface of the spool valve 6 is a push rod 36 of the electromagnet portion 3, which will be described later.
This is the contact part with.

The electromagnet part 3 has a cylindrical case 32 made of a ferromagnetic material, and a flange-like portion 33a of one end of the case 32 contacts and engages with the cylindrical case 32 inside one end of the case 32, and extends from the flange-like portion 33a toward the other side inside the case 32. A thick cylindrical core 3 made of a ferromagnetic material and extending concentrically with the case 32.
3, a stationary part consisting of a coil assembly 35 which is clamped and fixed deep inside the cylindrical space formed by the case 32 and the core 33; A push rod 36 made of a magnetic material, and the push rod 36
The movable part includes a plunger 37 made of a ferromagnetic material that is fixedly installed on the other end side and is attracted by the coil assembly 35.

In the movable part, a plunger 37 is fixed to the other end of the push rod 36, that is, the side away from the pressure regulating valve part 2.
is in the shape of a thick disk, and the end of the cylindrical core 33, which forms a component of the stationary part when the plunger 37 is sucked, is fitted into the center of the side facing the core 33 with a minute interval therebetween. A cylindrical recess 37a is formed, and its outer circumferential portion 37b faces the inner circumferential surface of the case 32 with a small distance therebetween. In addition, an outer race 34a of a linear rolling bearing 34 is press-fitted and fixed in the hollow part 33b of the core 33 with a predetermined tightness, and a large number of balls 34b of the bearing 34 are radially moved toward the push rod 36 in a predetermined preload state. is supported so as to be movable in the axial direction. Note that the ball 34b is prevented from falling off the outer race 34a by a stopper member.

On the other hand, the end of the cylindrical case 32 on the side of the plunger 37 is closed by a lid member 39, and the other end is connected to the flange-like part 5a of the sleeve 5 of the valve part 2, a disc spring 40 having a suitable through-hole, and a core flange. They are coupled with the shaped portion 33a in between. In addition, when the electromagnet part 3 is in a non-excited state (see the upper half of FIG. 1), the disc spring 40 is biased in a direction that opposes the spring 22, that is, in a direction that assists the attraction of the plunger 37 based on the excitation, and When the plunger 37 moves by a predetermined amount based on the excitation of the electromagnetic portion 3, the disc spring 40 becomes a free length state and the urging force on the push rod 36 is released.

The valve sleeve 5 adjacent to the connecting portion between the pressure regulating valve section 2 and the electromagnet section 3 has an appropriate number of port-shaped openings 42, 42 that communicate the inner diameter portion of the valve sleeve 5 with the outside.
... is opened, whereby the opening 42
, 42 . . . so that the inside of the electromagnet portion 3 communicates with the outside.

Further, a cylindrical recess 43 is formed from the end of the valve sleeve 5 in the inner diameter part of the valve sleeve 5 where the openings 42, 42, etc. are opened, and the recess 43 is described later. The filter member 45, which has a structure with no directionality in the longitudinal direction, can be fitted from either the forward or reverse side.

As shown in detail in FIG. 2, the filter member 45 has a cylindrical shape and is made of a synthetic resin material.
An appropriate number of connecting portions 46b, 46b... that connect these annular portions 46a, 46a and connecting portions 46b, 46b...
It has a frame member 46 composed of window portions 46c, 46c formed by the above, and a mesh-like fiber member 47 is disposed inside the frame member 46. Furthermore, a locking protrusion 46d is provided at the center of at least two of the connecting portions 46b, 46b, . . . of the frame member 46.

46d is formed to protrude in the outer diameter direction, and the locking protrusion 4
6d and 46d are adapted to be locked in at least two locking recesses 43a formed corresponding to the cylindrical recess 43 formed in the valve sleeve 5.

Furthermore, since the filter member 45 has a predetermined elastic force,
By pushing the filter member 45 into the cylindrical recess 43 of the sleeve 5, the locking protrusion 46d engages with the locking recess 43a while being elastically deformed, and the filter member 45 is attached with one touch, and the inner circumference of the recess 43 is fixed. Filter member 45 outer peripheral surface and recess 4
3 and the end face of the filter member 45 are windowed with a predetermined interference, so that the filter member 45 and the sleeve 5 are in a predetermined sealed state. Note that when the filter member 45 is attached, the filter member 45 is symmetrical with respect to a plane that bisects the cylinder length in the longitudinal direction, and has no directionality in the longitudinal direction, so that it can be easily attached.

Since this embodiment has the above configuration, the electromagnet part 3
When the coil assembly 35 is energized, the case 32 and the core 3
3 and the plunger 37, an electromagnetic flux circuit is formed between the plunger 37 and the plunger 37,
The plunger 37 is attracted in response to the current (2) applied to the coil assembly 35, and the push rod 36 is moved to the left in the figure, thereby moving the spool valve 6. Pressure fluid, such as hydraulic pressure, is supplied from a pump or the like to the supply port 15 of the valve sleeve 5, and the valve sleeve 5 and the spool valve 6 are supplied from the supply port 15.
The connection is made between the lands 17 and 19 of the spool valve 6 through an opening formed by the lands 19 of the valve sleeve 5, and further via the output port 13 of the valve sleeve 5, which is always in communication with the lands 17 and 19, for example in an automatic transmission. It is supplied to each hydraulic equipment in the hydraulic system that requires pressure oil. Further, the pressure of the pressure oil output from the output port 13 is transmitted through the feedback path 1
4 and feedback port 1 via orifice 21
6 and guided into the sealed space formed by the land portion 19, the small-diameter land portion 20 adjacent thereto, and the valve sleeve 5, and the cross-sectional area A of the land portion 19 is changed from the cross-sectional area of the small-diameter land portion 20. Area difference A, -A2 after subtracting A2
is applied to the biasing force F5P of the spring 22 to press the spool valve 6 in the right direction in FIG. F two. , ' (the suction force of the plunger 37 and the biasing force of the disc spring 40) are slid within the valve sleeve 5 to a position where the spool valve 6 is balanced. and,
Due to the sliding displacement by the spool valve 6, the spool valve 6
The supply port 15 and the discharge port 12 of the valve sleeve 5 are controlled to open alternately with respect to the output port 13 by the lands 17.19 of the valve sleeve 5, and as a result, the output pressure P at the output port 13 is controlled to be Corresponding to the input electromagnetic signal, P = (FsaL-Fsp) / (AI A2)
−■.

Then, during the above-mentioned pressure regulating action, the push rod 3 of the electromagnet part 3
6. Due to the movement of the plunger 37, etc., a volume change occurs inside the electromagnet part 3, and the fluid inside the electromagnet part 3 expands due to the heat generated from each part of the electromagnet part 3, causing a volume change. Volume changes escape to the outside via openings 42.42 formed in the valve sleeve 5. Moreover, the heat generated inside the electromagnet section 3 is cooled and dissipated to the outside by the fluid sucking and discharging action accompanying the movement of the movable section inside the electromagnet section 3 during the pressure regulating operation.

Further, when the fluid is sucked and discharged, the fluid from the outside flowing into the electromagnet section 3 through the openings 42, 42 is filtered by the filter member 45. Foreign matter is prevented from entering into the interior of 3.

(G) As described in detail, according to the present invention, the valve sleeve (5)
An opening (42), (
42), and the inside of the electromagnet part (3) is communicated with the outside through the openings (42), (42), so there is no need to make any changes to the structure of the electromagnet part (3) itself. By simply forming the openings (42), (42) in the valve sleeve 5, which is easy to process, the electromagnet part (
3) The responsiveness of the movable part is significantly improved, and the accuracy of the pressure regulating characteristics by the pressure regulating valve section (2) of the pressure regulating valve (1) is improved. Also, the opening (42).

Since the filter member (45) is disposed on the valve sleeve (5) so as to cover the electromagnet part (42), the electromagnet part (3
) without complicating the structure of the electromagnet part (3) itself.
) can be prevented from entering the inside of the pressure regulating valve (1), and the filter member (45) can be extremely easily assembled when assembling the pressure regulating valve (1), so that the manufacturing cost of the pressure regulating valve (1) can be kept low. As described above, the performance can be improved without changing the external dimensions of the pressure regulating valve (1).

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the pressure wR regulating valve according to the present invention, and FIG. 2 is a perspective view showing a filter member fitted into the inner diameter part of the valve sleeve of the pressure regulating valve. be. DESCRIPTION OF SYMBOLS 1... Pressure regulating valve, 2... Pressure regulating valve part, 3... Electromagnet part, 5... Valve sleeve, 6... Spool valve, 42... Opening part, 45... Filter member. ,

Claims (6)

[Claims] (1) A pressure regulating valve comprising a pressure regulating valve section including a valve sleeve and a spool valve slidably accommodated in the inner diameter portion of the valve sleeve, and an electromagnet section connected to the pressure regulating valve section, An opening is formed in a portion of the valve sleeve near the electromagnet, and the inside of the electromagnet communicates with the outside through the opening, and a filter member is disposed in the valve sleeve so as to cover the opening. A pressure regulating valve characterized by: (2) The pressure regulating valve according to claim 1, wherein the filter member is disposed on the inner diameter side of the valve sleeve. (3) The pressure regulating valve according to claim 2, wherein the filter member has a cylindrical shape, and a cylindrical recess for fitting the cylindrical filter member is formed on the inner diameter side of the valve sleeve. . (4) The pressure regulating valve according to claim 3, wherein the cylindrical filter member is constituted by a frame member made of a synthetic resin material and a mesh-like fiber member disposed on the frame member. (5) A locking projection is formed on the outer peripheral surface of the frame member constituting the cylindrical filter member, and a locking recess into which the locking projection can lock is formed in the cylindrical recess on the inner diameter side of the valve sleeve. The pressure regulating valve according to claim 4. (6) The pressure regulating valve according to claim 5, wherein the cylindrical filter member is configured to be left-right symmetrical with respect to a plane that bisects the cylinder length in the longitudinal direction.