JP2012241733A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid valve with excellent reliability, which prevents a foreign matter from reaching a sliding part of a plunger even if an external connector is disposed facing upward.SOLUTION: Both an external opening part 5a and an internal opening part 5b are provided on the upper side (the side of the external connector 6). In a ventilation passage 5, a peripheral bypass 9 is provided extending from the side of the external connector 6 to the peripheral opposite side of a yoke 1. In the middle of the peripheral bypass 9, a U-turn part 9a turning at its lower part is formed. Even if foreign matters enter from the external opening part 5a, the foreign matters entering from the external opening part 5a stay on the bottom of the U-turn part 9a with their own weight without reaching the internal opening part 5b, thereby preventing the foreign matters from reaching a capacity variable chamber α (the sliding part of the plunger 3). An operation failure is prevented and reliability is improved. The peripheral bypass 9 is provided as a groove 11a in the outer peripheral face of a coil molded resin 11, to reduce the cost.

Description

  The present invention relates to a solenoid valve (solenoid valve) including a linear solenoid (electromagnetic actuator) in which an external opening of a breathing passage is provided at a fitting portion of an external connector and a yoke (a base portion of the external connector). The present invention relates to a technique suitable for use in a hydraulic control device for an automatic transmission.

The background art will be described with reference to FIGS. The reference numerals used in this background art (reference numerals in FIGS. 2 and 3) are the same functional elements as those in [Mode for Carrying Out the Invention] and [Examples] described later.
As shown in FIGS. 2 and 3, a linear solenoid 4 in which an external opening 5 a of a breathing passage 5 is provided in a fitting portion β of the external connector 6 and the yoke 1, and a valve V (drawing) driven by the linear solenoid 4. There is known a solenoid valve that is coupled to a spool valve (for example, see Patent Documents 1 and 2).
Patent Document 1 shows a solenoid valve using a ring core 8 (magnetic body ring that transfers magnetism between the sliding core 7 and the cup bottom of the yoke 1), and Patent Document 2 shows the ring core 8. The solenoid valve which is not used is shown.

As described above, in the solenoid valve in which the external opening 5a of the breathing passage 5 is provided at the base of the external connector 6, when the external connector 6 is arranged toward the upper side of the yoke 1 (top side in the vertical direction) The external opening 5a is opened above the yoke 1.
Therefore, “foreign matter falling from above {for example, when oil droplets fall from the mechanical part of the automatic transmission as shown on the right side of FIG. 3B” or “foreign matter gently falling in oil” {For example, as shown in the left side of FIG. 3B, when placed in oil in an oil pan, etc.} "easily enters the inside of the respiratory passage 5 from the external opening 5a.

As shown in FIG. 3, the breathing passage 5 disclosed in Patent Documents 1 and 2 includes “the fitting portion β of the external connector 6 and the yoke 1 (the base portion of the external connector 6)”, “the plunger 3 and the yoke 1. The volume fluctuation chamber α ”formed between the bottom portion of each of the two chambers communicates with the shortest distance.
For this reason, when the external connector 6 is arranged on the upper side, the foreign matter that has entered the respiratory passage 5 from the external opening 5a easily reaches the volume variation chamber α (the sliding portion of the plunger 3). For this reason, there is a concern that the sliding failure of the plunger 3 may occur due to the foreign matter reaching the volume fluctuation chamber α.
That is, in the conventional solenoid valve, when the external connector 6 is arranged upward, there is a concern that malfunction may occur due to the entry of foreign matter.

Japanese Patent No. 4569371 JP 2003-329164 A

  The present invention has been made in view of the above-described problems, and the object of the present invention is to determine whether a foreign object is present regardless of the direction in which the external connector is disposed (that is, even when the external connector is disposed upward). An object of the present invention is to provide a highly reliable solenoid valve that does not reach the volume fluctuation chamber (sliding portion of the plunger).

[Means of claim 1]
According to a first aspect of the present invention, both the external opening and the internal opening of the respiratory passage are provided on the external connector side in the circumferential direction of the yoke, and the circumferential bypass that extends from the external connector side to the opposite side of the circumferential direction of the yoke in the respiratory passage A road is provided.
This
(I) the circumferential detour has at least one turn in the circumferential direction of the yoke,
(Ii) The circumferential detour includes a U-turn portion that turns back in the circumferential direction of the yoke,
At least one of the above is adopted.
For this reason, even if the external connector is arranged facing upward, the foreign matter that has entered from the external opening accumulates in the lower part of the circumferential bypass due to the gravity of the foreign matter itself and does not reach the internal opening.
As described above, by providing the circumferential bypass in the breathing passage, the foreign substance can be accommodated in the volume variation chamber regardless of the arrangement direction of the external connector (that is, even when the external connector is arranged upward). Does not reach (plunger sliding part). For this reason, it is possible to prevent malfunction of the solenoid valve and improve reliability.

[Means of claim 2]
The internal opening of claim 2 is provided in a ring core that transfers magnetism between a stator component (for example, a sliding core) inserted and arranged inside the coil and a cup bottom of the yoke.

[Means of claim 3]
According to a third aspect of the present invention, in a state where the solenoid valve is mounted on a vehicle, a part of the circumferential bypass route reaches the ground direction in the circumferential direction of the yoke (lower part of the yoke).
As a result, the foreign matter that has entered from the external opening accumulates in the lower part of the yoke (a part of the circumferential bypass) due to the gravity of the foreign matter itself, and the foreign matter does not reach the internal opening.

[Means of claim 4]
According to a fourth aspect of the present invention, the circumferential detour includes a U-turn portion that is folded back in the circumferential direction of the yoke.
As a result, foreign matter accumulates in the lower portion of the U-turn portion, and the foreign matter does not reach the internal opening.

[Means of claim 5]
The circumferential detour of claim 5 is provided by a groove formed on the outer peripheral surface of the coil molding resin for molding the coil.
Thus, since the circumferential bypass is provided by the groove formed on the outer peripheral surface of the coil mold resin, even a complicated circumferential bypass can be easily formed.

It is explanatory drawing of the respiratory passage provided in a linear solenoid (Example). It is sectional drawing of a solenoid valve (conventional example). It is explanatory drawing which shows the penetration | invasion path | route of a foreign material (conventional example).

[Description of Embodiments] [Mode for carrying out the invention] will be described with reference to the drawings.
Solenoid valve
A magnetic yoke 1 having a bottomed and substantially cylindrical cup shape;
A coil 2 housed inside the yoke 1 and generating a magnetic force when energized;
A plunger 3 that is displaced in a linear direction by the magnetic force generated by the coil 2;
The linear solenoid 4 having

Between the plunger 3 and the bottom of the yoke 1, a volume variation chamber α whose volume varies with the displacement of the plunger 3 is formed.
Inside the linear solenoid 4, there is provided a breathing passage 5 that communicates the “volume fluctuation chamber α” and “the outside of the yoke 1”.
The external opening 5 a of the breathing passage 5 is provided in a fitting portion β (a base portion of the external connector 6) between the external connector 6 and the yoke 1.

  The internal opening 5 b of the breathing passage 5 is provided in the ring core 8 that transfers magnetism between the stator component (sliding core 7) inserted and arranged inside the coil 2 and the cup bottom of the yoke 1. The ring core 8 is assembled so that the inner opening 5 b faces in the same circumferential direction as the outer connector 6. The breathing passage 5 is provided with a circumferential bypass 9 extending from the external connector 6 side (the side where the external opening 5a and the internal opening 5b are provided) to the opposite side of the yoke 1 in the circumferential direction.

A specific example (example) to which the present invention is applied will be described with reference to the drawings. The following examples show specific examples, and it goes without saying that the present invention is not limited to the examples.
In the following embodiments, the same reference numerals as those in the “DETAILED DESCRIPTION OF THE INVENTION” denote the same functional objects. In the following description, the left side in FIG. 1 is described as left and the right side as right, but this left-right direction does not depend on the actual mounting direction.

  The solenoid valve shown in this embodiment is mounted on a hydraulic control device for an automatic transmission for a vehicle, and a valve V (for example, a spool valve, a ball valve, etc.) that performs oil path switching control and hydraulic control: FIG. And a linear solenoid 4 for driving the valve V.

The valve V is inserted and arranged in an oil circuit housing (oil passage case) that forms a large number of oil passages in the hydraulic control device.
A valve body 10 that is inserted directly into the oil circuit housing;
A valve body that is displaced inside the valve body 10;
A return spring that urges the valve body toward the side where the linear solenoid 4 is disposed (right side);
It is configured with.

The linear solenoid 4 drives the valve body on the side (left side) where the return spring is arranged against the urging force of the return spring.
(A) a magnetic yoke 1 having a bottomed and substantially cylindrical cup shape;
(B) a coil 2 that generates a magnetic force when energized (reference numeral, see FIG. 2);
(C) The coil 2 is molded and accommodated inside the yoke 1, and a coil mold resin 11 partially forming the external connector 6 outside the yoke 1;
(D) a plunger 3 that is displaced in a linear direction by the magnetic force generated by the coil 2;
(E) A magnetic attraction core that magnetically attracts the plunger 3 to the left side by the magnetic force generated by the coil 2; a cylindrical shape that covers the periphery of the plunger 3 and directly slides the plunger 3; A magnetic core, and a magnetic stator core 12 provided with a magnetic attraction core, a magnetic blocking portion, and a sliding core 7 integrally. When,
(F) a magnetic ring core 8 that transfers magnetism between the sliding core 7 (corresponding to a stator component) and the cup bottom of the yoke 1;
(G) a biasing ring 13 for pressing the sliding core 7 toward the cup bottom of the yoke 1;
Is provided.

  The yoke 1 is a magnetic metal (for example, a ferromagnetic material such as iron) that covers the periphery of the coil 2 and allows a magnetic flux to flow, and the components of the linear solenoid 4 (coil mold resin 11 + stator core 12 + ring core 8 + bias ring) 13 and the like, and then the claw portion formed at the left end portion is caulked to the valve body 10, whereby the valve V and the linear solenoid 4 are firmly coupled.

  The coil 2 generates a magnetic force when energized to form a magnetic flux loop passing through the yoke 1, the magnetic attraction core, the sliding core 7 and the plunger 3, and is made of a resinous bobbin (primary molding resin). A large number of conductive wires (such as enameled wires) with insulating coating are wound around them.

The coil molding resin 11 is a secondary molding resin that molds the coil 2 together with the bobbin to form the external connector 6.
The external connector 6 protrudes from the substantially U-shaped cutout portion 1a formed on the opening end side of the yoke 1 to the outside of the yoke 1, and is electrically connected to an electronic control device (AT-ECU not shown) that controls the solenoid valve. The connector terminal 6 a connected to both ends of the coil 2 is disposed inside the external connector 6.

The coil mold resin 11 is formed by replacing the bobbin after the winding of the coil 2 is completed and the assembly of the connector terminal 6a (including electrical connection with the coil end) with a resin mold (the shape of the coil mold resin 11). Set inside a mold to be determined), and a resin (for example, PPS, PBT, nylon resin, etc.) is poured into the resin mold and formed into a substantially cylindrical shape.
The cylindrical portion of the stator core 12 is inserted and disposed on the substantially cylindrical inner peripheral surface. Further, the substantially cylindrical outer peripheral surface (portion excluding the external connector 6) is inserted and disposed inside the bobbin.

The plunger 3 is a magnetic metal (for example, a ferromagnetic material such as iron) having a substantially cylindrical shape, and slides directly with the inner peripheral surface of the sliding core 7 as described above. The plunger 3 is transmitted with a biasing force of a return spring disposed on the valve V via a valve body and a shaft. That is, the plunger 3 is urged to the right side by the return spring together with the valve body.
A breathing hole 3a penetrating in the axial direction is formed inside the plunger 3 shown in FIG.

  The ring core 8 is a magnetic metal (for example, a ferromagnetic material such as iron) having a substantially disk shape, and a cylindrical surface is provided on the inner periphery to increase the contact area with the sliding core 7. Is provided with a disk surface in contact with the cup bottom of the yoke 1.

The urging ring 13 is an elastic body (a spring material or a rubber material) that is compressed between the bobbin (or the coil mold resin 11) and the ring core 8 and is elastically deformable at least in the axial direction.
Specifically, the urging ring 13 is a metal ring elastic body such as a wave washer or a disc spring, or a rubber ring elastic body such as an O-ring or a ring disc rubber.

Between the plunger 3 and the bottom of the yoke 1, a volume variation chamber α whose volume varies with the displacement of the plunger 3 is formed.
In order to displace the plunger 3 in the left-right direction by the magnetic force generated by the coil 2 and the biasing force of the return spring, it is necessary to make the volume fluctuation chamber α variable.
Therefore, the linear solenoid 4 of this embodiment includes a breathing passage 5 that communicates the volume variation chamber α with the outside of the yoke 1.

The breathing passage 5 includes an external opening 5a that opens to the outside of the yoke 1 and an internal opening 5b that opens to the volume variation chamber α. The external opening 5a includes the external connector 6 and the yoke 1. The fitting portion β (the base portion of the external connector 6) is provided.
The central portion of the cup bottom portion of the yoke 1 is provided with a convex portion 1b that protrudes inward. Even when the plunger 3 is pressed against the cup bottom portion of the yoke 1, the plunger 3 A gap is formed between the cup bottoms.

Here, the tip (right end) of the sliding core 7 is provided so as to form a gap with the cup bottom of the yoke 1, but if a ring core 8 that abuts the cup bottom is provided, the ring core 8 causes the breathing passageway. 5 is cut off.
Therefore, in this embodiment, a breathing groove that connects the outer peripheral side and the inner peripheral side is formed on the right surface (the surface that contacts the cup bottom) of the ring core 8, and this breathing groove is used as the inner opening 5b. .
In this embodiment, an example in which the internal opening 5b is formed in the ring core 8 is shown, but an internal opening 5b (breathing groove) that communicates the inside and outside of the ring core 8 may be provided at the cup bottom of the yoke 1.

As shown in FIG. 1, the solenoid valve of this embodiment is mounted on a vehicle with an external connector 6 disposed on the upper side of the yoke 1. That is, the external connector 6 is mounted on the vehicle in a state where it is arranged on the upper side in the vertical direction.
On the other hand, the internal opening 5b is provided in the same circumferential direction as the external connector 6 (external opening 5a). That is, the internal opening 5b is arranged toward the upper side of the plunger 3 in the vehicle mounted state.

  The breathing passage 5 extends from the external connector 6 side (the upper side when the vehicle is mounted) to the opposite side in the circumferential direction of the yoke 1 (the lower side when the vehicle is mounted) in the middle of the external opening 5a and the internal opening 5b. An extending circumferential detour 9 is provided.

Here, the external opening 5a and the internal opening 5b are provided in the same direction as the external connector 6 (upper side when mounted on the vehicle), and the circumferential bypass 9 is from the external connector 6 side (upper side when mounted on the vehicle). Extending to the opposite side of the yoke 1 in the circumferential direction (lower side when mounted on the vehicle)
(I) the circumferential bypass 9 rotates at least once in the circumferential direction of the yoke 1 or
(Ii) The circumferential bypass 9 includes a U-turn portion 9a that turns back in the circumferential direction of the yoke 1,
At least one of these will be adopted.

Therefore, as shown in FIG. 1, the circumferential bypass 9 of this embodiment includes a U-turn portion 9 a that turns back in the circumferential direction of the yoke 1, and the breathing passage 5 has this U-turn. It always communicates through the part 9a.
And this U-turn part 9a (a part of the circumferential detour 9) reaches the ground direction (lower part) in the circumferential direction of the yoke 1 when the vehicle is mounted.

The circumferential detour 9 including the U-turn portion 9 a is provided by a groove 11 a formed on the outer peripheral surface of the coil mold resin 11 inserted into the inner peripheral surface of the yoke 1.
Specifically, the outer peripheral surface of the coil mold resin 11 is provided with a convex surface 11 b that is substantially in close contact with the inner peripheral surface (cylindrical surface) of the yoke 1, and a recess slightly provided between the convex surface 11 b and a gap between the convex surface 11 b and the yoke 1. A groove 11a (concave surface) is provided, and a circumferential bypass 9 is provided by a gap between the inner peripheral surface of the yoke 1 and the groove 11a.

(Effect 1 of an Example)
In the solenoid valve of this embodiment, as described above, both the external opening 5a and the internal opening 5b are provided on the upper side (in the direction of the external connector 6), and the respiratory passage 5 is provided on the lower side from the upper side (external connector 6 side). A circumferential bypass 9 extending to the side (opposite to the circumferential direction of the yoke 1) is provided, and a U-turn portion 9 a is provided in the middle of the circumferential bypass 9.
For this reason, even if the external connector 6 is arranged facing upward and foreign matter enters from the external opening 5a, the foreign matter that has entered from the external opening 5a is moved to the lower part (U-turn) of the circumferential bypass 9 due to the gravity of the foreign matter itself. At the bottom of the portion 9a in the direction of gravity) and does not reach the internal opening 5b.
Thus, by providing the circumferential bypass 9 in the breathing passage 5, even if the external connector 6 is disposed on the upper side, the foreign matter does not reach the volume fluctuation chamber α (the sliding portion of the plunger 3). For this reason, it is possible to prevent malfunction of the solenoid valve and improve reliability.

(Effect 2 of Example)
If the groove 11a that forms the circumferential bypass 9 is formed on the inner peripheral surface of the yoke 1, the workability is poor, which increases the cost.
On the other hand, in this embodiment, as described above, the circumferential bypass 9 is provided by the groove 11a on the outer peripheral surface of the coil mold resin 11.
Thus, since the circumferential bypass 9 is provided by the groove 11a on the outer peripheral surface of the coil mold resin 11, even the complicated circumferential bypass 9 can be easily formed by the mold of the coil mold resin 11. And increase in cost can be suppressed.

  In the above embodiment, the example in which the present invention is applied to the solenoid valve using the ring core 8 has been described. However, the present invention may be applied to a solenoid valve not using the ring core 8.

  In the above embodiment, the U-turn portion 9a is provided in the circumferential bypass 9 and the circumferential bypass 9 is folded back. However, the breathing passage 5 is rotated so as to make one rotation inside the yoke 1. A direction detour 9 may be provided.

  In the above-described embodiment, the example in which the present invention is applied to the solenoid valve used in the hydraulic control device of the vehicle automatic transmission has been described. However, the present invention may be applied to other solenoid valves other than the automatic transmission. .

DESCRIPTION OF SYMBOLS 1 Yoke 2 Coil 3 Plunger 4 Linear solenoid 5 Breathing passage 5a External opening 5b Internal opening 6 External connector 7 Sliding core (stator part)
8 Ring core 9 Circumferential bypass 9a U-turn part 11 Coil mold resin 11a Groove α Volume fluctuation chamber β Fitting part

Claims (5)

A magnetic yoke (1) having a bottomed and substantially cylindrical cup shape, a coil (2) that is housed in the yoke (1) and generates a magnetic force when energized, and a coil (2) A plunger (3) that is displaced in a linear direction by the generated magnetic force,
A solenoid having a linear solenoid (4) in which a volume fluctuation chamber (α) whose volume changes with the displacement of the plunger (3) is formed between the plunger (3) and the bottom of the yoke (1). In the valve
The linear solenoid (4) includes a breathing passage (5) communicating the volume variation chamber (α) and the outside of the yoke (1),
The respiratory passage (5) includes an external opening (5a) that opens to the outside of the yoke (1), and an internal opening (5b) that opens to the volume fluctuation chamber (α).
The external opening (5a) is provided in a fitting portion (β) between the external connector (6) for energizing the coil (2) and the yoke (1),
The inner opening (5b) is provided in the same circumferential direction as the outer connector (6) in the circumferential direction of the yoke (1),
The solenoid valve according to claim 1, wherein the breathing passage (5) includes a circumferential bypass (9) extending from the external connector (6) side to the opposite side of the yoke (1) in the circumferential direction. The solenoid valve according to claim 1, wherein
The internal opening (5b) is provided in the ring core (8) that transfers magnetism between the stator component (7) inserted and arranged inside the coil (2) and the cup bottom of the yoke (1). A solenoid valve characterized by that. The solenoid valve according to claim 1 or 2,
This solenoid valve is mounted on the vehicle in a state of being mounted on the hydraulic control device of the vehicle automatic transmission,
A part of the circumferential bypass (9) reaches the ground direction in the circumferential direction of the yoke (1) when mounted on a vehicle. The solenoid valve according to any one of claims 1 to 3,
The said circumferential direction bypass (9) is equipped with the U-turn part (9a) turned back to the circumferential direction of the said yoke (1), The solenoid valve characterized by the above-mentioned. In the solenoid valve according to any one of claims 1 to 4,
The circumferential bypass (9) is formed on the outer peripheral surface of a coil molding resin (11) which molds the coil (2) and is inserted into the yoke (1) from the opening of the yoke (1). The solenoid valve is provided by a groove (11a).

Images