WO2002018828A1

WO2002018828A1 - Solenoid valve

Info

Publication number: WO2002018828A1
Application number: PCT/JP2001/007282
Authority: WO
Inventors: Ichiro Hirata; Norio Uemura; Yoshinari Kasagi
Original assignee: Nok Corporation
Priority date: 2000-08-28
Filing date: 2001-08-24
Publication date: 2002-03-07
Also published as: AU2001280160A1; DE10196576B4; DE10196576T1; JP4210775B2

Abstract

A solenoid valve used suitably for various types of hydraulic pressure controls, capable of increasing the slidability of a plunger, and providing excellent control characteristics, wherein the plunger (1) is formed generally in a cylindrical shape, a large diameter part (1a) forming a sliding portion is provided on the outer peripheral side of the plunger to slidably support the plunger on a sleeve, a plurality of projected surface parts (1d) and a plurality of groove parts (1e) are alternately provided in the large diameter part (1a), and the cross section thereof is formed in the shape of a petal.

Description

Description ^: Solenoy Dopano Lev Technical Field

The present invention relates to a solenoid suitably used for various fluid pressure controls and the like. Background art

Conventionally, as this type of solenoid valve, for example, there is one shown in FIG. FIG. 8 is a schematic configuration sectional view of a solenoid valve according to the related art.

The solenoid valve 200 includes a solenoid part 200 A, a valve part 200 B, and a cap.

Here, the knob portion 200B is a spool valve, and since the opening area of the valve changes in accordance with the stroke of the spool, the amount of fluid inflow and the amount of fluid can be controlled by controlling the stroke amount of the spool with a solenoid. It is configured to control the amount of outflow.

The solenoid part 200 A is generally driven by a coil 203, a plunger 201 magnetically attracted to the center post 202 by energizing the coil 203, and a drive of the plunger 201. And a rod 204 connected to the plunger 201 for transmitting the pressure to the valve portion 200B (specifically, the spool).

Also, a first bearing 205 and a second bearing 210 for improving the coaxiality of the reciprocating plunger 201 and the rod 204 and a sleep 2 for supporting the plunger 201 etc. 0 6 and the upper part that forms the magnetic path It is provided with a plate 207, a lower plate 209, a case 208, and the like.

Here, the plunger 201 is configured to be located away from the center post 202 in a normal state, that is, in a state in which the coil 203 is not energized.

Generally, the plunger 201 is configured to be biased in a direction away from the center post 202 by a biasing member such as a spring. In the illustrated example, the plunger is configured to be separated from the center post 202 via the spool by providing a spring that biases the spool in the direction of the solenoid portion 20OA.

By energizing the coil 203, a magnetic path is formed, and the plunger 201 is magnetically attracted to the center post 202.

Therefore, the magnetic force can be controlled by the magnitude of the current flowing through the coil 203, whereby the amount of movement of the plunger 201 is controlled by controlling the balance with the biasing member such as a spring. Thus, the stroke amount can be controlled, thereby controlling the flow rate of the fluid, and performing various fluid pressure controls such as hydraulic control.

Here, the basic performance required of a solenoid valve generally includes coaxiality. This is because if the coaxiality is insufficient, the plunger rod tilts with respect to the axis and repeats reciprocating motion, resulting in uneven wear in which only a part is worn, and the characteristics in the forward and return paths are reduced. This is because it leads to deterioration of control characteristics such as changing hysteresis and bias of magnetic flux toward the plunger. This coaxiality is determined by the dimensioning of each member, but as the number of members involved in axis alignment increases, the error propagation increases due to the dimensional tolerance of each member. You.

In the case of the solenoid valve 200 shown in FIG. 8 described above, the members involved in centering directly or indirectly contact the plunger 201, the center-to-bottom 202 and the opening 204. It is a supporting member. The plunger 201, the center post 202, and the rod 204 themselves, the first bearing 205, the second bearing 210, the sleeve 206, and the upper The plate 207, the lower plate 209, and the case 209 are nine members.

Therefore, the dimensional control of the nine members had to be strictly controlled, which placed a heavy burden on improving the coaxiality with high accuracy.

Therefore, in order to reduce this burden, a structure has been developed to reduce the number of members involved in centering by using the sleeper that supports the plunger and bearing the plunger itself.

Although details are omitted, in this case, the members involved in the centering are five members: a plunger, a rod, a center post, a sleeve, and a rod bearing. It is possible to improve the degree.

Also, unlike the configuration shown in FIG. 8, there is no need for a bearing structure at each end of the plunger, so that there is an advantage that the axial direction can be reduced.

In the case of a solenoid pulp configured in this way, the plunger performs smoothly and stably in a reciprocating motion, so that it has excellent slidability with respect to the inner circumference of the sleeve serving as the bearing, and has both ends in the axial direction. Pressure at It is required to provide a flow path (oil path etc.) on the outer peripheral surface of the plunger in order to eliminate the force load and enhance the slidability.

This will be described with reference to FIG. Fig. 7 is a schematic cross-sectional view of a plunger according to the prior art. ((A) is a cross-sectional view cut through the shaft center, (B) is a cross-sectional view cut along the axis ^ vertical direction (AA in (A)). (It is a cross section and corresponds to the whole part.)

As shown in the figure, the plunger 301 according to the prior art has a substantially cylindrical shape, is provided with a large-diameter portion 301 a that slides on the inner periphery of the sleeve, and has a groove 310 serving as a flow path. 1b is formed by cutting.

As a result, the inner circumference of the sleeve and the plunger 301 slide while contacting curved surfaces having substantially the same diameter, and the liquid (oil) force S flows through the flow path, so that no pressure load is applied. Since the liquid slides while obtaining lubricity, the reciprocating operation can be suitably performed.

However, in practice, it is necessary to provide a predetermined clearance between the inner diameter of the sleeve and the outer diameter of the plunger in order to smoothly slide, so that the plunger is completely removed from the sleeve. There is no reciprocating motion while maintaining coaxiality. As shown in Fig. 3 (B), the large-diameter portion 301a of the plunger and the inner circumference 302 of the sleeve are 1 in the cross section perpendicular to the axis. It will slide while touching at points.

However, in the case of the conventional technology as described above, the following problems have occurred.

As described above, the plunger slides against the sleeve while making contact at one point in the cross section perpendicular to the axis. However, there was a disadvantage that the sliding wear was poor. Also, since the outer diameter of the plunger and the inner diameter of the sleeve are almost the same, the gap near the sliding part is very narrow, and when foreign matter (impurity) enters, the foreign matter remains trapped. There was a problem that slidability deteriorated.

An object of the present invention is to provide a solenoid pulp having improved controllability and improved slidability of a plunger. Disclosure of the invention

In order to achieve the above object, in the present invention,

A solenoid pulp comprising: a plunger that reciprocates by a magnetic force generated by an exciting unit; and a sleeve that slidably supports the outer periphery of the plunger to perform a bearing.

The sleeve has an inner peripheral wall surface for carrying a bearing, and has a circular cross-sectional shape of the inner peripheral wall surface perpendicular to the shaft,

On the outer periphery of the plunger,

A plurality of convex portions extending in the axial direction, having a curved shape having a radius of curvature smaller than a distance from the axis to the outer peripheral surface, and sliding on the inner peripheral wall surface;

And a plurality of grooves, each of which is provided between adjacent convex surfaces and forms a channel extending in the axial direction.

Therefore, since the curved surface has a radius of curvature smaller than the distance from the axis to the outer peripheral surface, that is, the inner peripheral surface of the sleep also slides on a small curved surface, sliding with only one convex portion is difficult. As it becomes unstable, it slides on two adjacent convex surfaces. In other words, sliding at two points instead of one point in the section perpendicular to the axis as in the past become. As a result, sliding wear is reduced in the case of two-point contact as compared with the case of one-point contact because the load is dispersed.

In addition, since the circumference of the sleeve also slides on a small curved surface, the gap near the sliding portion can be made relatively large, and fluid can easily enter, so that lubricity is improved, and Even if foreign matter enters, it can easily escape to the flow path.

It is preferable that the convex portions are provided in the same orientation with respect to the circumferential direction, and are provided at odd positions.

Therefore, the convex portion and the groove have a positional relationship symmetrical with respect to the axis, and in a state where two adjacent convex portions move, the axial center of the intermediate position (groove) between the two convex portions is shifted. The outer peripheral surface on the opposite side across the is most distant from the inner periphery of the sleeve, but since this portion is a convex portion, rattling can be suppressed.

The cross section perpendicular to the axial direction of the flow path formed by the groove and the inner peripheral wall has a structure in which impurities contained in the fluid flowing into the solenoid pulp body are removed outside the solenoid valve body before flowing. The size and shape may be set to include the size and shape of the eye of the filter.

Therefore, the size of impurities contained in the fluid flowing into the solenoid valve body by the filter is limited to a size that can pass through the eyes of the filter. Therefore, no impurities are trapped in the flow path.

The convex portion and the groove provided on the outer periphery of the plunger are obtained by forging, and

On the end face of the plunger on the side opposite to the pressing direction at the time of forging molding, a concave portion recessed inside is provided, The bottom surface of the concave portion may be a pressed portion which is pressed against the ejector pin to remove the plunger body from the forging die after forging.

Therefore, when the ejector pin pushes the plunger body out of the forging die, even if burrs are generated at the portion pressed by the ejector pin (pressed portion), only burrs are generated at the bottom surface of the concave portion. There is no impact.

In the solenoid valve of the present invention,

A solenoid valve comprising: a plunger that reciprocates by a magnetic force of an exciting unit; and a sleeve that slidably supports the outer periphery of the plunger to perform a bearing.

The outer peripheral shape of a cross section perpendicular to the axial direction, which is a sliding portion with respect to the inner peripheral wall surface of the plunger, is a polygon. Here, “polygon” means that each corner is R This shall include cases where the shape is used.

According to this configuration, the plunger having a polygonal cross-sectional outer shape is slidably supported by the inner peripheral wall surface of the sleep having a circular cross-sectional shape. Therefore, the plunger slides at only one corner, so that the plunger slides at two adjacent corners. In other words, as in the conventional case, sliding occurs at two points instead of one point in a cross section perpendicular to the axis. As a result, the sliding wear is reduced in the two-point contact as compared with the one-point contact because the load is dispersed. In addition, sliding at the corners makes it possible to make the gap near the sliding part relatively large, facilitates fluid entry, and improves lubricity, and even when foreign matter enters. However, the air will escape into the flow path.

The outer peripheral shape may be an odd polygon. In particular, the outer peripheral shape is preferably a substantially regular octagon.

Therefore, the angular portion and the flat portion of the outer periphery of the plunger have a symmetrical positional relationship with respect to the axis center, and rattling can be reduced. In addition, the cross-sectional area of the flow path formed by the outer flat surface portion of the plunger and the inner peripheral wall surface of the sleeve can be set to an appropriate size in consideration of the balance between the supply of the magnetic path and the discharge of foreign matter. . When cutting the plunger, the flat part of the plunger is checked. It is preferable that the chuck be a three-point chuck. In this case, the outer peripheral shape is a multiple polygon of 3 (regular polygon). It is necessary that the regular octagon satisfies the condition suitably.

The cross section perpendicular to the axial direction of the flow path formed by the flat surface portion of the outer periphery of the plunger and the inner peripheral wall surface of the sleeve is provided with impurities contained in the fluid flowing into the solenoid valve main body before the flow. It is recommended that the filter be set to a shape including the size of the mesh of the filter to be removed outside the body of the solenoid valve.

Therefore, the size of the impurities contained in the fluid flowing into the solenoid valve body by the filter is limited to such a size as to pass through the eyes of the filter, and the cross section of the flow path is the size of the eyes of the filter. Since the dimensions include the shape, the impurities do not get caught in the flow path. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic configuration sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a schematic configuration sectional view of a plunger according to the first embodiment of the present invention,

Fig. 3 is a schematic diagram showing the sliding part between the plunger and the inner periphery of the sleeve.

FIG. 4 is a schematic diagram showing an example of the shape of a groove provided in the plunger, and FIG. 5 is a schematic configuration sectional view of the plunger according to the second embodiment of the present invention.

FIG. 6 is a schematic view showing a part of the manufacturing process of the plunger according to the embodiment of the present invention.

FIG. 7 is a schematic configuration cross-sectional view of a plunger according to the related art, and FIG. 8 is a schematic configuration cross-sectional view of a solenoid valve according to the related art. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be illustratively described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are intended to limit the scope of the present invention only to them unless otherwise specified. is not.

(First Embodiment)

With reference to FIGS. 1 to 5, a solenoid valve according to a first embodiment of the present invention will be described.

FIG. 1 is a schematic configuration of a solenoid valve according to an embodiment of the present invention. FIG. FIG. 2 is a schematic cross-sectional view of a plunger according to a first embodiment of the present invention ((A) is a cross-sectional view cut through an axis, and (B) is a cross-sectional view cut in a direction perpendicular to an axis). (This is the BB cross section in (A) and corresponds to the whole part.) Fig. 3 is a schematic diagram showing the sliding portion between the plunger and the inner periphery of the sleeve. Fig. 5 is a schematic view showing a part of a manufacturing process of a plunger according to an embodiment of the present invention.

The solenoid pulp 100 is composed of a solenoid 100 A, a valve 100 B, and a force.

Here, the valve portion 100B is a spoon lever, and a spool 15 is provided inside the valve sleeve 16 so as to be able to reciprocate, and according to the stroke of the spoon lever 15. Since the opening area of the valve formed in the vanoleb sleeve 16 changes, the amount of fluid inflow and outflow can be controlled by controlling the stroke amount of the spool 15 by the solenoid.

The solenoid section 100 A generally includes a coil 3, a plunger 1 magnetically attracted to the center boss 2 by conduction to the coil 3, a sleeve 4 serving as a bearing for the plunger 1, and a plunger 1. And a rod 7 connected to the plunger 1 for transmitting the drive of the motor to the spool 15.

In addition, the bobbin 6 around which the coil 3 is wound, the shim 8 for facilitating the plunger 1 being separated from the center post 2, the case 9, and the leakage of fluid from the inside of the valve portion 100B to the coil 3 side. It includes a packing 10 for preventing the magnetic field, an upper plate 11 for forming a magnetic path, and a bracket plate 12 for forming a magnetic path and fixing the solenoid valve body at a predetermined position. Further, by urging the bearing 13 of the rod 7 and the E-shaped ring 18 fixed to the spool 15, the plunger 1 is center-posted together with the spool 15 via the rod 7 together with the spool 15. The spring 14 includes a spring 14 that urges the coil 3 away from the connector 2, and a connector 17 that includes a terminal 17 a for energizing the coil 3.

Note that the coil 3 bobbin 6 is molded into an Assy (assemb1y) by a mold, and constitutes a mono-red coil sub-Asy5.

Here, the plunger 1 is configured to be located away from the center boss 2 in a normal state, that is, in a state where the coil 3 is not energized, that is, in the present embodiment, as described above, By biasing the spool 15 in the direction of the solenoid 100 A through the E-ring 18 by the spring 14, the plunger 1 is separated from the center post 2.

Then, by energizing the coil 3, a magnetic path (a magnetic path formed by the case 9, the upper plate 11, the plunger 1, the center post 2, and the bracket plate 12) is formed. Is magnetically attracted to the center post 2.

Therefore, the magnetic force can be controlled by the magnitude of the current flowing through the coil 3, whereby the amount of movement of the plunger 1 is controlled by controlling the amount of movement of the plunger 1 by controlling the balance with the biasing force of the spring 14. The stroke amount of 5 can be controlled, whereby the flow rate of the fluid can be controlled, and various fluid pressure controls such as hydraulic control can be performed.

Here, in the present embodiment, since the configuration is such that the plunger 1 is bearing by the sleeve 4, the members involved in the centering are There are five members: the lancer 1, rod 7, center post 2, sleeve 4, and rod bearing 13.Therefore, the burden of dimensional control is relatively small, and the coaxiality can be improved. .

Further, since there is no need to provide a bearing structure at both ends of the plunger 1, there is also an advantage that the axial direction can be reduced in size.

Next, the plunger 1 will be described in more detail.

The plunger 1 has a substantially cylindrical shape, and the rod 7 is fitted into the hole 1 b on the inner peripheral side, and is slidably supported by the sleep 4 on the outer peripheral side as described above, so that it becomes a sliding portion. A large diameter portion 1a is provided.

As shown in FIG. 2 (B), the large-diameter portion 1a is provided with a plurality of convex portions 1d and a plurality of groove portions _1e alternately, and has a cross-sectional shape like a petal. It has become.

The convex portion 1 d extends in the axial direction, and the distance from the tip (the farthest position from the axis) of each convex portion 1 d to the axis is set to be equal.

The convex portion 1d has a smooth curved shape, and the radius of curvature of the outer peripheral curved surface in a cross section perpendicular to the axis is set to be smaller than the distance from the tip of the convex portion 1d to the axis. I have. As a result, the distance from the tip of the convex portion 1d to the axis becomes smaller by the clearance than the inner peripheral diameter of the sleeve 4, so that the radius of curvature of the outer peripheral curved surface is naturally larger than the inner peripheral diameter of the sleeve 4. Become smaller.

For example, the distance from the tip of the convex portion 1d to the axis is 5 mm, and the radius of curvature near the tip of the convex portion 1d is 3 mm. In this case, the radius of the inner circumference of the sleeve 4 is 5 mm and is equal to the clearance. The diameter becomes larger.

The tip of the convex portion 1 d is disposed so as to be slidable on the inner peripheral surface of the sleeve 4.

A groove 1 e extending in the axial direction is provided between each adjacent convex surface 1 d, and a flow path is formed between the groove 1 e and the inner peripheral surface of the sleep 4.

In the solenoid valve 100 configured as described above, when the plunger 1 slides on the inner periphery of the sleeve 4, the sliding is performed smoothly as described in the above-described related art. Since the clearance is provided in the plunger, the plunger 1 does not reciprocate while keeping the axis completely coaxial with the sleeve 4. In the present embodiment, unlike the prior art, the radius of curvature (outer diameter) of the sliding surface is not substantially the same as the radius of curvature (inner diameter) of the inner peripheral surface of the sleeve. Since the radius of curvature of the convex portion 1d, which is the surface portion, is smaller than the radius of curvature (inner diameter) of the sleeve 4, it is extremely unstable to slide at only one point in a section perpendicular to the axis. Therefore, in reality, this is not the case, and as shown in Fig. 3 (A), the object slides while making two-point contact with the adjacent convex portion 1d.

Therefore, the load is dispersed and the load on the sliding portion is reduced as compared with the case where one point contact is made in a cross section perpendicular to the axis as in the prior art, so that the sliding wear property is improved.

In addition, since sliding occurs while the curved surfaces are in contact with each other, and the liquid (oil) flows through the flow path, there is no pressure load, and the liquid slides while obtaining lubricity. The reciprocating motion is the same as in the prior art. In the present embodiment, since the radius of curvature of the convex portion 1 d is smaller than the radius of curvature (inner peripheral diameter) of the sleeve 4, fluid flows from the flow path formed by the groove 1 e into the sliding portion. It is easy to flow into the pipe, so it has better lubricity than the conventional technology, and the slidability is improved. Furthermore, since the radius of curvature of the convex portion 1 d is smaller than the radius of curvature (inner diameter) of the sleeve 4, the gap near the sliding portion is larger than that of the conventional technology. Even if) has entered, foreign matter can easily escape into the flow path, so that a decrease in slidability due to the foreign matter can be prevented.

As described above, since the sliding property of the plunger is improved, fluid controllability such as hydraulic control is improved.

Hereinafter, more preferable specific examples will be described.

The above-mentioned convex portion 1d is preferably oriented in the circumferential direction, and is preferably provided in an odd number.

This is because the convex portion 1d and the groove portion 1e are arranged in a symmetrical positional relationship with respect to the axis center by providing the same orientation and an odd number of locations (see FIG. 2 (B)).

Therefore, as described above, the plunger 1 slides while contacting the two points by the adjacent convex portions 1 d, so that the outer peripheral surface on the opposite side with respect to the axis of the groove portion 1 e located at an intermediate position between the two points. Since this is the most distant from the inner circumference of the sleeve, making this portion a convex portion Id has the effect of minimizing the gap and suppressing rattling.

In the example shown in Fig. 2 (B), the groove 1e is a curved surface that smoothly connects the convex surface 1d and the curved surface, and has a radius of curvature R2 equivalent to the radius of curvature R1 of the convex surface 1d. Such a case was shown, but the invention is not limited to this, and a square groove 1 g as shown in FIG. 4 A triangular groove 1 h as shown in (B) may be used. Here, the cross section perpendicular to the axis of the flow path formed between the groove 1 e and the inner periphery of the sleep 4 should be dimensioned so that impurities contained in the fluid flowing through the flow path will not be caught and caught. desirable.

In order to achieve this, for example, if a filter for removing impurities contained in the fluid is installed on the flow path for guiding the fluid into the solenoid valve 100, the fluid flows into the solenoid pulp 100. The impurities contained in the fluid are smaller than those of the filter.

Therefore, by setting the dimension of the cross section perpendicular to the axis of the flow channel to include the size of the mesh of the filter, the inside of the channel formed by the groove 1 e and the inner periphery of the sleeve 4 is formed. It can be prevented that impurities are caught and clogged.

Therefore, stable slidability can be maintained.

Next, a preferred application example of the solenoid valve 100 according to the present embodiment will be described.

In engines such as automobiles, the intake and exhaust valves of the engine are opened and closed by the rotation of the force shaft. However, by controlling the pulp timing appropriately depending on the operating conditions (high speed / low speed), fuel efficiency is improved. Therefore, high exhaust gas purification can be obtained.

The control of the pulp timing can be performed by shifting the cam shaft in the rotation direction and changing the phase, and a technique of performing this using a solenoid valve is known as a known technique.

Here, in order to shift the camshaft in the rotation direction, a function such as a force S for performing hydraulic control by a solenoid valve and an arrangement space are required. In general, a solenoid valve is installed on the path of the engine oil flow path to use the engine oil.

Conventionally, a solenoid valve that performs on / off control has been used to perform control in two states, high speed and low speed.In recent years, linear control has been performed to achieve higher precision control. Solenoid pulp, which can be controlled, is being used.

Therefore, the above-described solenoid valve according to the embodiment of the present invention can be suitably used as such a linear control solenoid valve for valve timing control (VTC).

Here, as described above, in the case of using engine oil, since a large amount of foreign matter such as iron powder is contained in the engine oil, a force that uses a fluid under relatively bad conditions is used in the present embodiment. Such a solenoid valve is excellent in slidability by flowing foreign matter into the flow path, and thus can be suitably used even under such bad conditions.

Next, a method of manufacturing the plunger 1 constituting the solenoid valve 100 according to the present embodiment will be described with reference to FIG.

The plurality of convex portions 1 d and the plurality of grooves 1 e of the large-diameter portion 1 a of the plunger 1 are clamped by forging dies 50 and 51, and are pressed in the direction of arrow P in the figure to form a forging. It can be made by molding. The forging die 51 is shown by a dotted line in the figure for explanation of the subsequent manufacturing process.

In addition, 1f in the figure is the cutting part that is cut by the cutting process after forging.

Here, after the forging is performed, the forging die 51 is removed to remove the plunger 1 body from the mold. It is necessary to press (hit) the opposite end face in the direction of arrow Q with the ejector pin 52. '

Therefore, in the plunger according to the present embodiment, a concave portion 1c recessed inward from the tip surface is provided on the end surface opposite to the arrow P direction, and the bottom surface of the concave portion 1c is pressed by the ejector pin 52. It is a pressed part.

As a result, when pressed by the ejector pins 52, burrs generally occur. However, in the present embodiment, since the bottom surface of the concave portion 1c is the pressed portion, (P) in FIG. As shown in the enlarged view, the burrs B 1 and B 2 occur only in the concave portion, and do not affect the entire length of the plunger 1.

Therefore, if the stroke of the plunger affects the control as a solenoid valve, it is necessary to strictly control the entire length of the plunger. Cutting must be performed for the processing, but in the present embodiment, such a processing step is unnecessary because the burr does not affect the entire length of the plunger.

(Second embodiment)

A solenoid valve according to a second embodiment of the present invention will be described with reference to FIG. In the solenoid valve according to the second embodiment of the present invention, only the configuration of the plunger is different from that of the first embodiment, so only the plunger will be described in detail, and the description of the other components will be omitted. .

FIG. 5 is a schematic configuration sectional view of a plunger according to a second embodiment of the present invention cut in a direction perpendicular to an axis. The cross-sectional view taken along the axis of the plunger according to the present embodiment is the same as that of the above embodiment. This is the same as FIG. 2 (A) shown in the embodiment. Therefore, FIG. 5 is a view corresponding to the BB section in FIG. 2 (A).

As shown in FIG. 5, the large-diameter portion 1′a serving as a sliding portion with respect to the sleeve 4 of the plunger according to the present embodiment has a polygonal cross section perpendicular to the axial direction as shown in FIG. In the example, it is approximately a regular octagon.

The distance from the axis to the corner 1′d is set to be smaller than the inner diameter of the sleeve 4 by the clearance. Therefore, the corner 1 ′ d is disposed so as to be slidable on the inner peripheral surface of the sleeve 4.

Then, a flow path is formed between the flat portion 1 ′ e between the corner portions 1 ′ d and the inner peripheral surface of the sleep 4.

By configuring the plunger as described above, it is very unstable to slide at only one point in the cross section perpendicular to the axis, as in the case of the first embodiment. In reality, this is not the case, and the adjacent corners 1'd slide with two points of contact.

Further, in the present embodiment, since the corner 1 ′ d slides on the inner peripheral wall surface of the sleeve 4, the corner 1 ′ d is formed between the flat surface 1 ′ e and the inner peripheral surface of the sleeve 4. Since the fluid easily flows into the sliding part from the flow path, the lubricating property is more excellent than that of the conventional technology, so that the sliding property is improved.

Further, the corner 1′d slides on the inner peripheral wall surface of the sleeve 4. Therefore, the gap near the sliding part is larger than that of the conventional technology. Therefore, even if foreign matter enters the vicinity of the sliding part, the foreign matter easily escapes to the flow path. Can be prevented.

In this way, the slidability of the plunger is improved, so that fluid controllability such as hydraulic control is improved.

Further, in the present embodiment, the cross section is a substantially regular polygon and an odd-numbered polygon (in the illustrated example, a substantially regular octagon), so that the corner 1 ′ d and the plane 1 ′ e However, they are arranged in a symmetrical positional relationship with respect to the axis.

Therefore, as described above, the plunger 1 slides while being in two contact points by the adjacent corners 1′d, so that the plunger 1 is on the opposite side of the axis of the plane part 1′e which is an intermediate position between these two points. Since the outer peripheral surface of the sleeve is most distant from the inner periphery of the sleeve, making this part a corner 1'd has the effect of minimizing the gap and suppressing rattling.

Also, it is desirable that the corners 1 and d have an R shape, and if the R is too small, the wear will increase. Therefore, it is necessary to set the R to an appropriate value. The flow path formed between the peripheral surface and the peripheral surface will be described in detail.

Since a magnetic path is formed between the outer peripheral surface of the plunger and the inner peripheral surface of the sleeve 4, it is necessary to prevent the supply of magnetic flux from being hindered. The smaller the distance between the inner peripheral surfaces, the better.

On the other hand, in order to improve the slidability, the lubrication of the fluid (oil) is sufficient, and the larger the cross-sectional area of the flow path, the better, so that the oil does not stick. It is also desirable that the dimensions be such that impurities contained in the fluid flowing through the flow channel are not caught.

For example, when a filter that removes impurities contained in a fluid is installed on a flow channel that guides fluid into the solenoid pulp 100, impurities contained in the fluid flowing into the solenoid valve 100 are Only those smaller than the eyes of the filter. Therefore, by setting the cross-sectional dimension perpendicular to the axis of the flow path to include the size of the filter eye, it is possible to prevent impurities from being caught and clogged in the flow path. it can.

In consideration of the above points, it is necessary to set the dimensions and shape of the flow channel. In the present embodiment, since the cross-sectional shape is a regular polygon, the dimension and shape of the flow path are determined mainly by the regular square and the R dimension of the corner.

In addition, as a method of forming the plunger in the present embodiment, it is preferable to use a drawing process. Thus, there is an advantage that a slit process or the like for forming a flow path is not required as in the related art.

Also, the plunger can be formed by cutting. Here, when performing cutting, it is necessary to perform chucking in order to fix the plunger.However, the flat part 1'e is used to prevent the corner 1'd serving as the sliding part from being scratched. Must be fixed. Here, the chuck is a three-point chuck (third in the direction of 120 °) Force S Since it is suitable for machining with high accuracy, to fix the flat part 1'e with a three-point chuck, The outer shape of a simple section must be a multiple of 3 (regular polygon).

As described above, the outer peripheral shape of the cross section perpendicular to the axis of the plunger is The shape should be a regular polygon and an odd-numbered polygon from the viewpoint of preventing rattling, the size of the cross-sectional area of the flow path should be appropriate from the viewpoint of magnetic flux supply and lubricity, and the shape should be regular from the viewpoint of cutting. It is necessary to consider that it is a square and a multiple of three.

Considering these, it is optimal to use a substantially regular octagon.

Also, the setting range of R at corner 1'd is necessarily determined by the above conditions, but if R is too small, wear will increase. It is desirable to set to. Industrial applicability

As described above, in the present invention, since a plurality of convex portions and a plurality of grooves are provided on the outer periphery of the plunger, the plunger slides on the inner peripheral surface of the sleeve at two points in a cross section perpendicular to the axis. As a result, the load on the sliding portion is reduced, the sliding wear property is improved, and the control characteristics are improved. In addition, since the inner circumference of the sleeve also slides on a small curved surface, the gap near the sliding portion can be made relatively large, and fluid can easily enter, so that lubricity is improved, and Even when foreign matter enters, the foreign matter can escape into the flow path, so that the sliding property is improved and the control characteristics are improved.

If the convex portions are provided in the same orientation with respect to the circumferential direction and are provided in an odd number, rattling can be suppressed.

If the cross-section perpendicular to the axial direction of the flow path formed by the groove and the inner peripheral wall is set to the size and shape including the size and shape of the filter that removes impurities contained in the fluid, impurities will There is no pinching, and stable slidability can be maintained. On the end face of the plunger opposite to the pressing direction at the time of forging, a concave recess is provided inside, and this bottom face is pressed against the ejector pin to remove the plunger body from the forging die after forging. If the pressing portion is used, even if a paris is generated by the ezieta pin, the overall length of the plunger is not affected, and stable control can be performed without requiring a cutting process.

In addition, even when the outer peripheral shape of the cross section perpendicular to the axial direction of the plunger is a polygon, the plunger slides against the inner peripheral surface of the sleeve at two points in the cross section perpendicular to the axis. The load on the moving part is reduced, sliding wear is improved, and control characteristics are improved.

In addition, sliding at the corners makes it possible to make the gap near the sliding part relatively large, facilitates fluid entry, improves lubricity, and ensures that even if foreign matter enters, In addition, since foreign substances can escape into the flow path, the slidability is improved, and the control characteristics are improved.

If the outer peripheral shape is a substantially regular octagon, the corners and the plane part have a symmetrical positional relationship with respect to the axis center, which can reduce rattling and set the cross-sectional area of the flow passage to an appropriate size. And a three-point check can be performed when cutting.

If the cross-section perpendicular to the axial direction of the flow path formed by the flat surface portion of the outer periphery of the plunger and the inner peripheral wall surface of the sleeve is set to the size and shape including the size and shape of the filter for removing impurities contained in the fluid, No impurities are trapped in the flow path, and stable slidability can be maintained.

Claims

The scope of the claims

1. A solenoid valve comprising: a plunger that reciprocates by a magnetic force generated by an exciting unit; and a sleeve that slidably supports the outer periphery of the plunger to perform a bearing,

On the outer periphery of the plunger,

A plurality of convex portions extending in the axial direction sliding on the inner peripheral wall surface, the curved surface shape having a radius of curvature smaller than the distance from the axis to the outer peripheral surface;

A plurality of grooves, each of which is provided between adjacent convex surfaces, and which forms a flow path extending in the axial direction.

2. The solenoid valve according to claim 1, wherein the convex portion is provided in an equal orientation with respect to a circumferential direction, and is provided at an odd number of positions.

3.The cross section perpendicular to the axial direction of the flow path formed by the groove and the inner peripheral wall removes impurities contained in the fluid flowing into the solenoid valve body outside the solenoid pulp body before flowing. 3. The solenoid valve according to claim 1, wherein the size of the filter is set to a size including a size of an eye of the filter.

4. The convex surface and the groove provided on the outer periphery of the plunger are obtained by forging,

On the end face of the plunger on the side opposite to the pressing direction at the time of forging molding, a concave portion recessed inside is provided,

The plunger body is forged from the forging die after forging 4. The solenoid valve according to claim 1, wherein the solenoid valve is a pressed portion which is pressed by an ejector pin to be taken out.

5. A solenoid valve comprising: a plunger that reciprocates by a magnetic force of an exciting unit; and a sleeve that slidably supports the outer periphery of the plunger to perform a bearing.

A sliding part of the plunger with respect to the inner peripheral wall surface, wherein an outer peripheral shape of a cross section perpendicular to the axial direction is a polygon.

6. The solenoid valve according to claim 5, wherein the outer peripheral shape is an odd-numbered polygon.

7. The solenoid valve according to claim 5, wherein the outer peripheral shape is a substantially regular octagon.

8.The cross section perpendicular to the axial direction of the flow path formed by the outer peripheral flat surface portion of the plunger and the inner peripheral wall surface of the sleeve allows impurities contained in the fluid flowing into the solenoid valve body to flow therein. 8. The solenoid pulp according to claim 5, 6 or 7, wherein the dimension is set to include a dimension of a filter to be removed outside the solenoid valve body beforehand. Claims of amendment

[January 10, 2010 (10.0.102) Accepted by the International Bureau: Claims originally filed and 6 were withdrawn; Claims originally filed 1, 3-5 , 7 and 8 have been corrected

The other claims remain unchanged. (Page 2)] Claims

1. (After correction) A plunger that reciprocates by the magnetic force of the excitation means,

A sleeve for slidably supporting the outer periphery of the plunger and performing a bearing; and a solenoid pulp comprising:

On the outer periphery of the plunger,

A curved surface shape having a radius of curvature smaller than the distance from the axis to the outer peripheral surface, and at least odd-numbered portions provided equidistantly with respect to the circumferential direction and extending in the axial direction sliding on the inner peripheral wall surface. 5 or more convex surfaces,

A plurality of grooves, each of which is provided between adjacent convex surfaces and forms a flow path extending in the axial direction, comprising: a plurality of grooves;

2. (Delete)

3. (After the correction) The cross section perpendicular to the axial direction of the flow path formed by the groove and the inner peripheral wall is formed so that impurities contained in the fluid flowing into the solenoid valve body can be removed from the outside of the solenoid pulp body before flowing. 2. The solenoid valve according to claim 1, wherein the size of the filter is set to a size including a size of an eye of the filter to be removed.

4. (after correction) The convex surface and the groove provided on the outer periphery of the plunger are obtained by forging, and

On the end face of the plunger opposite to the pressing direction at the time of forging, a QII part recessed inside is provided,

The bottom surface of the recess is set on a paper in which the plunger body is recovered from the forging die after forging (Article 2 of the Convention). 4. The solenoid valve according to claim 1, wherein the portion is a pressed portion pressed by an ejector pin to be taken out.

5. (After correction) A plunger that reciprocates by the magnetic force of the excitation means,

A sleeve for slidably supporting the outer periphery of the plunger to perform a bearing.

A solenoid valve, wherein a sliding portion of the plunger with respect to the inner peripheral wall surface, the outer peripheral shape of a cross section perpendicular to the axial direction is an odd-numbered polygon of pentagon or more.

6. (Delete)

7. (After correction) The solenoid valve according to claim 5, wherein the outer peripheral shape is a substantially regular octagon.

8. (After capture) The cross section perpendicular to the axial direction of the flow path formed by the outer flat surface portion of the plunger and the inner peripheral wall surface of the sleeve is included in the fluid flowing into the solenoid valve body. 8. The solenoid valve according to claim 5, wherein the size of the filter is set to include the size and shape of an eye of a filter for removing impurities outside the body of the solenoid pulp before flowing in.

Paper captured (Article of the Convention)