JP4151601B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve in which a valve element is driven by an attractive force generated by energizing a coil.

[Conventional technology]
Conventionally, hydraulic pressure control is performed using an electromagnetic valve in which a valve element is driven by an attractive force generated by energizing a coil. As shown in FIG. 2 or FIG. 3, the conventional electromagnetic valve 100 includes an electromagnetic part 103 that drives the valve body 102 to one side in the axial direction by an attractive force generated by energizing the coil 101, and one end of the electromagnetic part 103. And a valve main body portion 105 that controls the hydraulic pressure of the output pressure port 104 when the valve body 102 is displaced in the axial direction.

  The electromagnetic unit 103 includes a plunger 106 that drives the valve body 102 in the axial direction by an attractive force generated by energizing the coil 101, and a plunger storage unit 107 that is disposed on the inner peripheral side of the coil 101 and stores the plunger 106. And have. The valve body 102 can be displaced in the axial direction by interlocking with the plunger 106 via the shaft 108, and the hydraulic pressure of the output pressure port 104 is controlled by changing the opening area along with this displacement. Such a solenoid valve 100 is used, for example, in a hydraulic control device of an automatic transmission, and mainly controls clutch pressure.

  The electromagnetic valve 100 is classified into a non-sliding electromagnetic valve shown in FIG. 2 and a sliding electromagnetic valve shown in FIG. 3 depending on non-contact or contact between the outer peripheral surface of the plunger 106 and the inner peripheral surface of the plunger accommodating portion 107. it can.

  In the non-sliding solenoid valve, for example, as shown in FIG. 2, a bearing mechanism is provided on one end side of the plunger 106, and the outer peripheral surface of the plunger 106 and the inner peripheral surface of the plunger accommodating portion 107 have a predetermined gap in the radial direction. It is arranged to have E. As a result, the outer peripheral surface of the plunger 106 and the inner peripheral surface of the plunger housing portion 107 are brought into close contact with each other by the suction force, thereby preventing the inoperability. However, the physique of the electromagnetic part 103 will become large by presence of the clearance gap E. FIG. Further, since the gap E forms a magnetic resistance, it is necessary to increase the number of turns of the coil in order to obtain a predetermined attractive force, and the size of the electromagnetic unit 103 is further increased.

  For this reason, the electromagnetic part 103 of the non-sliding type electromagnetic valve may be arranged outside a mounted device such as a hydraulic control device. Therefore, in order to prevent water and the like from entering the inside of the electromagnetic part 103, O-rings 109 are arranged in each part. Further, the surface of a member (for example, the core stator 110 or the yoke 111) that cannot prevent adhesion or intrusion of water or the like is subjected to rust prevention treatment.

  On the other hand, as shown in FIG. 3, the sliding solenoid valve is arranged so that the outer peripheral surface of the plunger 106 and the inner peripheral surface of the plunger housing portion 107 are in sliding contact. In the electromagnetic part 103 of the sliding type solenoid valve, the outer peripheral surface of the plunger 106 and the inner peripheral surface of the plunger accommodating part 107 are prevented from adhering to each other by the suction force. One side is subjected to non-magnetic treatment. In addition, one side is subjected to a hardening process (for example, a nitriding process) for improving wear resistance.

  For this reason, in the sliding solenoid valve, the gap E as shown in FIG. 2 is extremely small. Further, since the non-magnetic treated portion that becomes magnetic saturation is extremely thin, it is not necessary to increase the number of turns of the coil in order to obtain a predetermined attractive force. As described above, the electromagnetic part 103 of the sliding type solenoid valve can be made smaller in size than the electromagnetic part 103 of the non-sliding type solenoid valve, which is advantageous in that it can be placed inside the mounted device together with the valve body part 105. . In this case, it is not necessary to subject the surfaces of the core stator 110 and the yoke 111 to rust prevention, and the O-ring 109 is also unnecessary (see, for example, Patent Document 1).

[Deficiencies of conventional technology]
In recent years, the required number of solenoid valves has increased due to the trend toward multi-stage automatic transmissions. Therefore, there has been a growing demand for the electromagnetic unit 103 to be disposed outside the mounted device while employing a sliding solenoid valve. Yes.
When the electromagnetic part 103 of the sliding type solenoid valve is arranged outside the mounted device, like the electromagnetic part 103 of the non-sliding type solenoid valve, an O-ring 109 is arranged at a necessary place to provide water or the like inside. In addition to preventing intrusion, it is necessary to apply a rust prevention treatment to the surface of a member that cannot prevent water from adhering or entering.

As shown in FIG. 3, the core stator 110 of the sliding type electromagnetic valve has a plunger accommodating portion 107 formed on the other side in the axial direction, and a flange portion used for connecting the electromagnetic portion 103 and the valve main body portion 105 on one end side. 112 is formed. For this reason, the inner peripheral surface of the plunger accommodating portion 107 needs to be subjected to a nonmagnetic treatment or a hardening treatment that improves wear resistance. On the other hand, even if the O-ring 109 is disposed at the same position as the non-sliding solenoid valve, the flange portion 112 cannot be prevented from adhering or entering water or the like, and therefore needs to be subjected to rust prevention treatment.
As described above, when the electromagnetic part 103 of the sliding type electromagnetic valve is disposed outside the attached device, the core stator 110 needs to be subjected to both non-magnetic treatment or hardening treatment and rust prevention treatment. There is.

However, since the surface subjected to the non-magnetic treatment or the hardening treatment cannot be subjected to the anti-rust treatment, the core stator 110 of the conventional sliding electromagnetic valve is partially subjected to the non-magnetic treatment or the hardening treatment. It is necessary to perform rust treatment, and the surface treatment work becomes extremely complicated.
JP 2001-227669 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sliding electromagnetic valve that can reduce the complexity of the surface treatment of the core stator.

[Means of Claim 1]
According to the first aspect of the present invention, the electromagnetic part of the electromagnetic valve constitutes a magnetic circuit facing the plunger that drives the valve body in the axial direction by the attractive force generated by energizing the coil, and one end surface of the plunger. A facing surface is formed, a plunger housing member that slidably accommodates the plunger in the axial direction, and is coaxially coupled to one end side of the plunger housing member, and is used for coupling the electromagnetic portion and the valve body portion. And a flange member.
Further, the flange member is made of a material having an antirust effect such as stainless steel, for example, and an O-ring is arranged on the flange member to maintain airtightness with respect to the plunger and the plunger housing member.
According to this, the core stator of the sliding type electromagnetic valve is divided into a plunger housing member that requires a nonmagnetic treatment or a hardening treatment and a flange member that needs a rust prevention treatment. For this reason, unlike the conventional core stator, it is not necessary to perform a non-magnetic treatment or a curing treatment and a rust prevention treatment on one member, so that the work of applying a surface treatment to the core stator of the sliding electromagnetic valve is complicated Can be reduced.

Further, since the flange member is made of a material having a rust prevention effect, it is not necessary to subject the flange member to a rust prevention treatment, so that the complexity of the surface treatment work can be further reduced.

[Means of claim 2 ]
According to the second aspect of the present invention, the flange member is made of a material having an antirust effect, and includes a bearing portion that slidably holds a shaft that interlocks the plunger and the valve body.
In the sliding electromagnetic valve, in order to precisely control the displacement of the valve body, the outer peripheral surface of the plunger and the inner peripheral surface of the plunger housing member are processed with extremely high accuracy. In order to prevent foreign matter from entering the inside of the plunger housing member, a bearing surface on which the shaft slides is formed on either the flange member or the plunger housing member to seal the inside of the plunger housing member. Is preferred.
Such a bearing surface needs to be subjected to a curing treatment for the purpose of improving wear resistance, but a surface subjected to a rust prevention treatment or a non-magnetic treatment cannot be subjected to a curing treatment. For this reason, when the bearing surface is formed on the plunger housing member, it is necessary to partially perform a non-magnetic treatment or a curing treatment, and the surface treatment work of the plunger housing member becomes complicated. On the other hand, a flange member made of a material having a rust-preventing effect (for example, stainless steel) is not subjected to surface treatment and can be hardened.
As described above, if a bearing portion including a bearing surface is formed on a flange member made of a material having a rust-preventing effect, foreign matter can be prevented from entering the plunger housing member, and the plunger housing can be accommodated. The complexity of the surface treatment work of the member can be reduced.

The electromagnetic part of the best mode solenoid valve has a plunger housing member that slidably accommodates the plunger in the axial direction, and has a facing surface that forms a magnetic circuit facing the one end surface of the plunger, and rust prevention The flange member is made of a material having an effect, is coaxially connected to one end side of the plunger housing member, and is used for connection of the electromagnetic part and the valve main body part. The flange member is provided with an O-ring to maintain airtightness with respect to the plunger and the plunger housing member. The flange member is provided with a bearing portion for holding the shaft to interlock the flop plunger and the valve body slidably.

[Configuration of Example 1]
The solenoid valve 1 of Example 1 is demonstrated based on FIG.
The electromagnetic valve 1 controls the hydraulic pressure by driving the valve body 3 with an attractive force generated by energizing the coil 2. This electromagnetic valve 1 controls the clutch pressure used for the hydraulic control apparatus of the automatic transmission for motor vehicles, for example.

  The electromagnetic valve 1 is disposed on one end side of the electromagnetic unit 4 that drives the valve body 3 to one side in the axial direction by an attractive force generated by energizing the coil 2, and the valve body 3 is a shaft A valve main body 5 is provided in which hydraulic control of the output pressure port 28 is performed by displacing in the direction. In this embodiment, the electromagnetic unit 4 is arranged outside the hydraulic control device.

The electromagnetic unit 4 is formed with a plunger 6 that drives the valve element 3 to one side in the axial direction by an attractive force generated by energizing the coil 2, and an opposing surface 8 that constitutes a magnetic circuit facing the one end surface 7 of the plunger 6. The plunger 6 is slidably accommodated in the axial direction, and is coaxially connected to one end of the plunger receiving member 9 to be used for the connection between the electromagnetic unit 4 and the valve body 5. The flange member 10, the plunger 6, and the shaft 11 that interlocks the valve body 3 are provided.
As described above, the electromagnetic valve 1 is a sliding electromagnetic valve disposed so that the outer periphery of the plunger 6 and the inner periphery of the plunger housing member 9 are in sliding contact.

  The plunger housing member 9 and the flange member 10 are formed with connecting means for connecting them. In the present embodiment, the plunger housing member 9 and the flange member 10 are formed with screw portions 12 and 13 that are screwed together in the axial direction as connecting means. Then, when the screw portions 12 and 13 are screwed together, the plunger housing member 9 and the flange member 10 are coaxially connected to form the core stator 14. Here, the core stator 14 is a member used to connect the electromagnetic part 4 and the valve body part 5 while accommodating the plunger 6 to form a magnetic circuit between the plunger 6 and the plunger, as in the conventional case.

  The plunger 6 is a substantially cylindrical body made of a magnetic material such as pure iron. The outer peripheral surface of the plunger 6 is subjected to non-magnetic treatment so as not to become inoperable due to close contact with the inner peripheral surface of the plunger housing member 9 by a suction force. In addition, the breathing path 15 for ensuring the movement of the air accompanying the displacement in the axial direction is formed in the plunger 6 so as to penetrate in the axial direction.

  The plunger housing member 9 is a substantially cylindrical body whose other end surface is open, and is made of a magnetic material, like the plunger 6. The substantially cylindrical portion of the plunger housing member 9 forms a plunger housing portion 16 that houses the plunger 6 slidably in the axial direction. The inner peripheral surface of the plunger accommodating portion 16 is subjected to a curing process so as not to become inoperable due to scratches or foreign matter generated due to sliding contact with the outer peripheral surface of the plunger 6. In addition, a concave screw portion 12 that is screwed into a facing surface 8 that constitutes a magnetic circuit facing the one end surface 7 of the plunger 6 and a screw portion 13 of the flange member 10 is provided at a portion on one end side of the plunger accommodating portion 16. Is formed. And the through-hole 17 is provided so that the inside of the plunger accommodating part 16 and the inside of the screw part 12 may be communicated to an axial direction, and the shaft 11 moves the inside of this through-hole 17 to an axial direction.

  The flange member 10 is a substantially disk-shaped body made of a material having a rust prevention effect such as stainless steel. The inner diameter portion of the flange member 10 is thicker in the axial direction than the outer diameter portion, and the central portion including the shaft center is penetrated in the axial direction to hold the shaft 11 slidably. That is, the inner diameter portion of the flange member 10 forms a bearing portion 18 that slidably holds the shaft 11. The inner peripheral surface of the bearing portion 18, that is, the bearing surface 19 on which the outer peripheral surface of the shaft 11 slides is subjected to a hardening process in order to reduce deterioration due to the sliding of the shaft 11. A screw portion 13 that is screwed with the screw portion 12 of the plunger housing member 9 is formed in a convex shape on the other end surface of the bearing portion 18. Further, the outer diameter portion of the flange member 10 forms a flange portion 20 used for connection between the electromagnetic portion 4 and the valve main body portion 5.

  The electromagnetic unit 4 is disposed on the outer periphery of the plunger housing member 9, and generates a suction force between the one end surface 7 of the plunger 6 and the opposing surface 8 of the plunger housing member 9. And a resin portion 22 that insulates the coil 2 from the core stator 14 and the yoke 21.

And the tip of one end side of the yoke 21 surrounds the outer periphery of the flange portion 20 of the flange member 10 and the flange portion 23 on the valve body side, and is caulked to connect the electromagnetic portion 4 and the valve body portion 5. .
Further, since the O-ring 24 is disposed on one end side and the other end side of the resin portion 22, adhesion or intrusion of water or the like to the plunger 6 and the plunger housing member 9 that are not subjected to the rust prevention treatment is prevented. The

  The valve body 5 includes a spool-like valve body 3, a valve body 3 that is slidably received, an output pressure port 28 that outputs a hydraulic pressure that forms a clutch pressure, and a port 25 that controls the clutch pressure. And a spring 27 for urging the valve body 3 toward the other side in the axial direction. The valve body 3 is transmitted with a driving force by a suction force from the plunger 6 via the shaft 11. Thereby, the valve body 3 can be displaced to one axial direction against the urging force of the spring 27.

[Operation of Example 1]
When the coil 2 is energized, a magnetic circuit is formed between the one end surface 7 of the plunger 6 and the opposing surface 8 of the plunger housing member 9, and an attractive force is generated. Thereby, the plunger 6 is displaced to one side and drives the valve body 3 to one side against the urging force of the spring 27. When energization of the coil 2 is stopped, the attractive force between the one end surface 7 of the plunger 6 and the opposing surface 8 of the plunger housing member 9 disappears. Thereby, the valve body 3 is driven to the other side by the urging force of the spring 27, and the plunger 6 is also displaced to the other side in conjunction with this.
As described above, the opening area of the port 25 is changed, and the hydraulic control of the output pressure port 28 is performed.

[Effect of Example 1]
In the electromagnetic valve 1 according to the first embodiment, a facing surface 8 that forms a magnetic circuit is formed facing the one end surface 7 of the plunger 6, and a plunger housing member 9 that slidably houses the plunger 6 in the axial direction; The core stator 14 is configured by the flange member 10 that is coaxially connected to one end side of the plunger housing member 9 and is used to connect the electromagnetic part 4 and the valve body part 5.
Thus, by configuring the core stator 14 with the plunger housing member 9 that requires a non-magnetic process or a curing process and the flange member 10 made of a material having a rust-preventing effect, one core stator 14 is formed like a conventional core stator. There is no need to perform any one of non-magnetic treatment or curing treatment and rust prevention treatment on the member. As a result, the complexity of the surface treatment operation can be reduced.

Moreover, in the solenoid valve 1 of Example 1, the flange member 10 consists of a raw material which has a rust prevention effect like stainless steel, for example.
Thereby, since it becomes unnecessary to perform the antirust process to the flange member 10, the complexity of surface treatment work can be reduced further.

In the solenoid valve 1 of the first embodiment, the inner diameter portion of the flange member 10 forms a bearing portion 18 that holds the shaft 11 slidably.
Thereby, it can prevent that a foreign material penetrate | invades into the plunger accommodating part 16 from the valve main-body part side. Moreover, the complexity of the surface treatment work can be reduced by forming the bearing surface 19 requiring the hardening treatment on the flange member 10. That is, it is possible to form the bearing surface 19 on the plunger housing member 9, but the work of performing the curing process on the plunger housing member 9 that requires non-magnetic treatment is extremely complicated. Therefore, if the bearing portion 18 is formed on the flange member 10 that has not been subjected to any surface treatment, the complexity of the surface treatment work can be reduced.

It is sectional drawing which shows the structure of a solenoid valve (Example 1). It is sectional drawing which shows the structure of a non-sliding type solenoid valve (conventional example). It is sectional drawing which shows the structure of a sliding type solenoid valve (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Coil 3 Valve body 4 Electromagnetic part 5 Valve main-body part 6 Plunger 7 One end surface 8 Opposing surface 9 Plunger accommodating member 10 Flange member 11 Shaft 18 Bearing part

Claims (2)

An electromagnetic part that drives the valve body to one side in the axial direction by an attractive force generated by energizing the coil, and one end side of the electromagnetic part, and the valve body is displaced in the axial direction to reduce the valve opening area. In a solenoid valve having a valve body part in which oil pressure is controlled by changing,
The electromagnetic part is
A plunger that drives the valve body to one side in the axial direction by receiving and displacing the suction force generated by energizing the coil;
A facing surface that forms a magnetic circuit facing the one end surface of the plunger is formed, and a plunger housing member that slidably houses the plunger in the axial direction;
It is made of a material having an antirust effect, is coaxially connected to one end side of the plunger housing member, and has a flange member used for connection between the electromagnetic part and the valve body part ,
An electromagnetic valve characterized in that an O-ring is disposed on the flange member to maintain airtightness with respect to the plunger and the plunger housing member . The solenoid valve according to claim 1,
The said flange member is equipped with the bearing part which hold | maintains slidably the shaft which makes the said plunger and the said valve body interlock | cooperate, The solenoid valve characterized by the above-mentioned.

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