JP6779681B2 - Electromagnetic switching valve with detent mechanism - Google Patents

Description

The present invention relates to an electromagnetic switching valve with a detent mechanism provided with a detent mechanism that self-holds a switching position of a valve body that switches and communicates between a plurality of flow paths.

In the conventional electromagnetic switching valve with a detent mechanism, the valve body is slidably inserted into the valve body in the axial direction, and one of the solenoid parts provided on both sides of the valve body is energized and sucked into the fixed iron core. The valve body is pressed toward one switching position by the iron core, or the valve body is pressed toward the other switching position by the movable iron core that is attracted to the fixed iron core by energizing the other solenoid part. Switching communication between the flow paths of. Then, two annular grooves are formed in the valve body apart from each other in the axial direction, and steel balls as spherical members are fitted into the one and the other annular grooves at the switching positions of one and the other to form an elastic member. It is provided with a detent mechanism that holds itself in a locked state by the elastic force of the spring (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-69015

However, in the electromagnetic switching valve with a detent mechanism disclosed in Patent Document 1, a steel ball fitted in the annular groove is housed in a holding member, and this holding member is formed by cutting carbon steel for mechanical structure. Therefore, it could not be manufactured inexpensively.

An object of the present invention is to provide an electromagnetic switching valve with a detent mechanism capable of inexpensively manufacturing a holding member of a detent mechanism for accommodating a spherical member and making the valve inexpensive.

In order to achieve such a problem, the present invention has taken the following measures. That is,
The valve body is slidably inserted into the valve body in the axial direction, and the valve body can switch and communicate between a plurality of flow paths through which fluid flows at one switching position and the other switching position separated in the axial direction. Both sides of the valve body are provided with solenoid parts that suck the movable iron core in the axial direction toward the fixed iron core by the suction force generated by energization, and one solenoid part is the movable iron core that is sucked into the fixed iron core by energization. A movable iron core is provided so as to press the valve body toward one switching position so that it can be engaged with one end in the axial direction of the valve body, and the other solenoid part is a movable iron core that is attracted to the fixed iron core by energization. A movable iron core is provided so as to press toward the other switching position so as to be engageable with the other end in the axial direction of the valve body, and the valve body has a valve body on one side provided with one solenoid part. A detent mechanism that self-holds at the other switching position is provided, and the detent mechanism uses an elastic member to accommodate a spherical member that cannot move in the axial direction and is movable in the radial direction in the holding member fixed to the valve body . The holding member fixed to the valve body constituting the detent mechanism is made of metal by providing two annular grooves that are urged toward the valve body and the spherical member is locked at one and the other switching positions in the axial direction. It is an electromagnetic switching valve with a detent mechanism, which is characterized by being formed of a sintered metal material obtained by molding and sintering a powder.

In this case, the valve body is provided with a holding-like member having substantially the same shape as the holding member and not provided with the spherical member and the elastic member on the other side portion provided with the other solenoid portion. Similar members may be formed of a sintered metal material obtained by molding and sintering metal powder.

As described in detail above, in the invention according to claim 1, the detent mechanism uses an elastic member to accommodate a spherical member that cannot be moved in the axial direction and is movable in the radial direction in a holding member fixed to the valve body. Two annular grooves, which are urged inward in the direction and in which spherical members are locked at one and the other switching positions, are provided axially apart from each other and held fixed to the valve body constituting the detent mechanism. The member was formed of a sintered metal material obtained by molding and sintering metal powder. For this reason, since the holding member is formed by molding metal powder and sintering it, the cutting process can be reduced and the manufacturing cost can be reduced as compared with the conventional one formed by cutting carbon steel for machine structure. , The valve can be cheaper.

Further, according to the second aspect of the present invention, the valve body is provided with a holding-like member having substantially the same shape as the holding member and not provided with a spherical member and an elastic member on the other side portion provided with the other solenoid portion. The holding-like member was formed of a sintered metal material obtained by molding and sintering metal powder. Therefore, since the holding-like member is formed by molding metal powder and sintering it, cutting work can be reduced and it can be manufactured at low cost, similarly to the holding member. Therefore, the valve can be made cheaper.

It is a vertical sectional view of the electromagnetic switching valve with a detent mechanism which showed one Embodiment of this invention. It is an enlarged sectional view of the main part C of FIG. It is an enlarged sectional view of the main part D of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a valve body, which has a substantially rectangular parallelepiped shape, and has a fitting / insertion hole 3 in which a spool-shaped valve body 2 is slidably fitted in the axial direction, and both sides of the valve body 1 are formed through. Female threads are engraved on both ends of the fitting hole 3 that opens to the surface. A supply flow path P for supplying a pressure fluid is opened at a substantially central portion in the axial direction of the fitting hole 3, and a fluid actuator (shown) has gaps on both sides of the connection point of the supply flow path P in the axial direction. The two load flow paths A and B connected to each other are opened, and the discharge flow paths R1 and R2 connected to the low pressure side with a gap outward in the axial direction of both load flow paths A and B, respectively. It is open. At one of the switching positions shown in the upper half of FIG. 1, the valve body 2 switches and communicates the supply flow path P with the load flow path A and the load flow path B with the discharge flow path R2, and connects with the discharge flow path R2 to the lower half of FIG. At the other switching position shown, the land portions 2A and 2B are provided so that the supply flow path P is switched and communicated with the load flow path B and the load flow path A is switched and communicated with the discharge flow path R1.

Reference numerals 5A and 5B are solenoid portions, and the fixed iron cores 6A and 6B are screwed into the female thread portions at both ends of the fitting hole 3 to be provided on both side portions of the valve body 1. Both solenoid portions 5A and 5B are generated by energizing the coils 9A and 9B by inserting the movable iron cores 7A and 7B into the tubular members 8A and 8B so as to be slidable in the axial direction so as to face the fixed iron cores 6A and 6B. The movable cores 7A and 7B are attracted in the axial direction toward the fixed cores 6 and 6B by the suction force, and the movable cores 7A and 7B are in contact with the fixed cores 6A and 6B at the end of the suction. The movable iron cores 7A and 7B are formed with three through holes 10A and 10B penetrating in the axial direction at equal intervals in the circumferential direction. The through holes 10A and 10B allow fluid to flow from one end to the other end and from the other end to one end of the movable iron cores 7A and 7B in accordance with the axial sliding of the movable iron cores 7A and 7B.

One solenoid portion 5A has a pin member 11A that presses the valve body 2 toward one switching position with a suctionable movable iron core 7A, and the pin member 11A loosely fits the insertion hole 12A of the fixed iron core 6A and is a movable iron core. It is provided so as to be engageable with 7A and one end of the valve body 2 in the axial direction. The other solenoid portion 5B has a pin member 11B that presses the valve body 2 toward the other switching position with the suctionable movable iron core 7B, and the pin member 11B is movable by loosely fitting the insertion hole 12B of the fixed iron core 6B. The iron core 7B and the other end of the valve body 2 in the axial direction are provided so as to be engaged with each other. By loosely fitting the pin members 11A and 11B into the insertion holes 12A and 12B of the fixed iron cores 6A and 6B, the pin members 11A and 11B flow through the gap between the insertion holes 12A and 12B and the pin members 11A and 11B, and the discharge flow path R1 of the valve body 1 The fluid of R2 flows inside the tubular members 8A and 8B, respectively.

Reference numeral 13 denotes a detent mechanism that self-holds the valve body 2 at one and the other switching positions, and is provided on one side of the valve body 1. As shown in FIG. 2, the detent mechanism 13 is composed of a holding member 14, steel balls 15 and 16 as spherical members, a spring 17 as an elastic member, and two annular grooves 18 and 19. The holding member 14 is sandwiched between the valve body 1 and the fixed iron core 6A via an elastic ring member 20 by screwing the fixed iron core 6A of one solenoid portion 5A into the female threaded portion of the fitting hole 3. It is attached inside the main body 1. The holding member 14 is formed of a sintered metal material obtained by molding and sintering metal powder, and corresponds to the sintered material SMF4030 for mechanical structural parts specified in Japanese Industrial Standards JIS Z2550: 2000. An insertion hole 21 penetrating in the axial direction is provided in the center of the holding member 14, and one end in the axial direction of the valve body 2 is inserted through the holding member 14. Further, in the holding member 14, the outer surface is recessed in an annular shape to form the accommodating groove 22, and two accommodating grooves 22 are radially penetrated between the forming portion of the accommodating groove 22 and the insertion hole 21 on the outer surface. The vertical holes 23 and 24 are formed so as to face each other, and the accommodating groove 22 passes through a substantially central portion of the vertical holes 23 and 24, and the groove width dimension is provided smaller than the diameter dimension of the vertical holes 23 and 24.

The steel balls 15 and 16 are provided so as to be immovable in the axial direction and movable in the radial direction by being fitted and inserted into the vertical holes 23 and 24 of the holding member 14. The spring 17 has a substantially C-shaped cross section, is accommodated in the accommodating groove 22 of the holding member 14, is pressed against the outer peripheral surfaces of the steel balls 15 and 16, and the steel balls 15 and 16 are brought into contact with the outer peripheral surfaces of the steel balls 15 and 16 by their own elastic force. It is urging inward in the radial direction. The two annular grooves 18 and 19 are formed in a substantially V shape on the outer peripheral surface of one end portion in the axial direction of the valve body 2 so as to be separated from each other in the axial direction, and one annular groove 18 is formed at one switching position of the valve body 2. The steel balls 15 and 16 urged by the elastic force of the spring 17 are locked, and the steel balls 15 urged by the elastic force of the spring 17 into the other annular groove 19 at the other switching position of the valve body 2. , 16 lock.

The other side portion of the valve body 1 is provided with a holding-like member 25 having substantially the same shape as the holding member 14 and not provided with steel balls 15, 16 and a spring 17. An insertion hole 26 penetrating in the axial direction is provided in the center of the holding-like member 25, and the other end in the axial direction of the valve body 2 is inserted. As shown in FIG. 3, the holding-like member 25 is interposed between the valve body 1 and the fixed iron core 6B by screwing the fixed iron core 6B of the other solenoid portion 5B into the female threaded portion of the fitting hole 3, and the valve. The space 27 partitioned by the main body 1, the valve body 2, and the fixed iron core 6B is filled. As a result, the acting force based on the pressure of the fluid flowing from the discharge flow path R1 to the space 27 acts on the valve body 2 to reduce pressing the valve body 2 toward the other switching position. The holding-like member 25 is formed of a sintered metal material (corresponding to SMF4030, a sintered material for machine structural parts) obtained by molding and sintering metal powder, like the holding member 14. There is. Reference numeral 28 denotes a terminal box provided on the upper part of the valve body 1, which electrically connects electrical wiring from an external power source to coils 9A and 9B of both solenoid portions 5A and 5B.

Next, the operation of such a configuration will be described.
The lower half of the valve body 2 in FIGS. 1 to 3 shows a state in which the steel balls 15 and 16 are locked in the other annular groove 19 and the valve body 2 is self-held at the other switching position, and both solenoid portions 5A. 5B is non-energized, and the valve body 2 switches and communicates the supply flow path P with the load flow path B and the load flow path A with the discharge flow path R1.

In this state, when one of the solenoid portions 5A is energized, the movable iron core 7A is attracted to the left side of FIG. 1 in the axial direction toward the fixed iron core 6A by the attractive force generated by the energization, and this attraction is performed through the pin member 11A. The valve body 2 is pressed to the left in FIG. 1 toward one switching position, and the steel balls 15 and 16 are separated from the other annular groove 19. At this time, as the valve body 2 is pressed to the left in FIG. 1, the movable iron core 7B of the other solenoid portion 5B is also pressed to the left in FIG. 1 via the pin member 10B.

Then, as shown in the upper half of the valve body 2 in FIGS. 1 to 3, when the valve body 2 reaches one of the switching positions, the steel ball 15 is urged inward in the radial direction by the elastic force of the spring 17. 16 locks in one of the annular grooves 18 to self-hold the valve body 2, and the valve body 2 switches and communicates the supply flow path P with the load flow path A and switches the load flow path B with the discharge flow path R2. Communicate. Then, one solenoid portion 5A is de-energized.

When the other solenoid portion 5B is energized in the state shown in the upper half of the valve body 2 in FIGS. 1 to 3 in which the valve body 2 is self-held at one switching position, the movable iron core 7B is fixed by the suction force generated by the energization. Axial suction is made toward the iron core 6B to the right in FIG. 1, and the valve body 2 is pressed to the right in FIG. 1 toward the other switching position via the pin member 11B, and the steel balls 15 and 16 are on one side. It separates from the annular groove 18 of. At this time, as the valve body 2 is pressed to the right in FIG. 1, the movable iron core 7A of one of the solenoid portions 5A is also pressed to the right in FIG. 1 via the pin member 10A. Then, when the sucked movable iron core 7B comes into contact with the fixed iron core 6B, the valve body 2 returns to the other switching position shown in the lower half of the valve body 2 in FIGS. 1 to 3, and the steel balls 15 and 16 are the other. It locks in the annular groove 19 and holds the valve body 2 by itself. Then, the other solenoid portion 5B is de-energized.

By this operation, the holding member 14 constituting the detent mechanism 13 was formed of a sintered metal material obtained by molding and sintering metal powder. For this reason, since the holding member 14 is formed by molding metal powder and sintering it, the cutting process can be reduced and the manufacturing cost is low as compared with the conventional one formed by cutting carbon steel for machine structure. And the valve can be cheaper. Further, the valve body 1 is provided with a holding-like member 25 having substantially the same shape as the holding member 14 and not provided with steel balls 15, 16 and a spring 19 on the other side portion provided with the other solenoid portion 5B. The holding-like member 25 was formed of a sintered metal material obtained by molding and sintering metal powder. Therefore, since the holding-like member is formed by molding metal powder and sintering it, cutting work can be reduced and it can be manufactured at low cost, similarly to the holding member 14. Therefore, the valve can be made cheaper.

In one embodiment, the steel balls 15 and 16 are used as the spherical member, but a ball or the like made of a hard material may be used, and the steel balls 15 and 16 are attached inward in the radial direction by an elastic force. A spring 17 having a substantially C-shaped cross section was used as the spring to be urged, but it was appropriately carried out by using two coil springs, leaf springs, etc. that urge the steel balls 15 and 16 inward in the radial direction, respectively. Of course you can do it.

1: Valve body 2: Valve body 5A, 5B: Solenoid part 6A, 6B: Fixed iron core 7A, 7B: Movable iron core 13: Detent mechanism 14: Holding member 15, 16 Steel ball (spherical member)
17: Spring (elastic member)
18, 19: annular groove 25: holding similar member

Claims (2)

The valve body is slidably inserted into the valve body in the axial direction, and the valve body can switch and communicate between a plurality of flow paths through which fluid flows at one switching position and the other switching position separated in the axial direction. Both sides of the valve body are provided with solenoid parts that suck the movable iron core in the axial direction toward the fixed iron core by the suction force generated by energization, and one solenoid part is the movable iron core that is sucked into the fixed iron core by energization. A movable iron core is provided so as to press the valve body toward one switching position so that it can be engaged with one end in the axial direction of the valve body, and the other solenoid part is a movable iron core that is attracted to the fixed iron core by energization. A movable iron core is provided so as to press toward the other switching position so as to be engageable with the other end in the axial direction of the valve body, and the valve body has a valve body on one side provided with one solenoid part. A detent mechanism that self-holds at the other switching position is provided, and the detent mechanism uses an elastic member to accommodate a spherical member that cannot move in the axial direction and is movable in the radial direction in the holding member fixed to the valve body . The holding member fixed to the valve body constituting the detent mechanism is made of metal by providing two annular grooves that are urged toward the valve body and the spherical member is locked at one and the other switching positions in the axial direction. An electromagnetic switching valve with a detent mechanism, which is characterized by being formed of a sintered metal material obtained by molding and sintering a powder. The valve body is provided with a holding-like member having substantially the same shape as the holding member and not provided with the spherical member and the elastic member on the other side portion provided with the other solenoid portion. The electromagnetic switching valve with a detent mechanism according to claim 1, wherein the metal powder is formed of a sintered metal material obtained by molding and sintering the metal powder.

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