JPH0861541A - Linear solenoid valve - Google Patents

Abstract

(57) [Abstract] [Purpose] The twisting force generated in the valve body pressing spring 15 is removed to eliminate the hysteresis when the valve body 6 moves left and right. [Structure] The other end 6B of the valve body 6 and the spring adjusting screw 14
A transmission member 30 that can move in the longitudinal direction of the valve body 6 and that is allowed to rotate is disposed between and. The valve body pressing spring 15 is contracted between the other end 30B of the transmission member 30 and the spring adjusting screw 14, and one end 30A of the transmission member 30 is provided.
Contacts the other end 6B of the valve body 6. Valve body pressing spring 1
The elastic force of 5 is applied from one end 30A of the transmission member 30 toward the other end 6B of the valve body 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a valve body guide hole formed in the valve body, and a plurality of flow paths are formed in the valve body guide hole.
The flow path has a valve portion whose opening is controlled by a valve body, and a solenoid portion having a coil, a fixed core, a movable core, and an operating rod integrally attached to the movable core in a housing. The present invention relates to a linear solenoid valve in which a valve body is elastically urged by a valve body pressing spring to come into contact with the operating rod, and is used as a valve for hydraulic control used in an automatic transmission of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally used linear solenoid valves will be described with reference to FIG. The linear solenoid valve R includes a valve portion V and a solenoid portion S, and the valve portion V has the following configuration. The valve body 1 has a flange portion 2 at one end on the right side in the drawing, a valve body guide hole 3 is bored in the inside along the longitudinal direction, and a solenoid portion S described later is fitted and arranged in the flange portion 2. A fitting hole 4 is formed, and a female screw hole 5 is provided at the other end on the left side of the valve body 1 concentrically with the valve body guide hole 3. First to sixth flow paths P1 to P6 are opened in the valve body guide hole 3 from the flange portion 2 side to the left in the drawing, and the flow paths P1 to P are provided.
6 is open on the lower surface of the valve body 1. And the valve body guide hole 3
A valve body 6 for controlling the opening of the flow path is movably arranged therein. The first flow path P1 is formed so as to accommodate one end 6A of the valve body 6 and is opened to an oil sump 7 such as a transmission case of a transmission. The second flow path P2 and the fifth flow path P5 are opened to the oil sump 7. The third flow passage P3 is connected to the control oil passage 9 connected to the hydraulic pressure operating unit 8, and the fourth flow passage P4 is connected to the hydraulic pressure source 10.
Is connected to the high pressure oil passage 11. Also, the sixth flow path P6
Is connected to the reaction force chamber 12 which the other end 6B of the valve body 6 faces, and is connected to the control oil passage 9 through the orifice 13.
On the other hand, the spring adjusting screw 14 is screwed into the female screw hole 5 formed at the other end of the valve body 1 to close the female screw hole 5, and the spring adjusting screw 14 and the other end 6B of the valve body 6 are provided.
A valve body pressing spring 15 is contracted between and, and the valve body 6 is pressed and biased rightward in the figure by the elastic force of the valve body pressing spring 15. (The valve body pressing spring 15 is contracted in the reaction force chamber 12)

The solenoid section S has the following structure. Two
Reference numeral 0 denotes a bottomed cylindrical housing having the other end open and a bottom portion 20A at one end. Inside the housing 20, a coil bobbin 22 around which a coil 21 is wound is arranged, and the other end side of the coil bobbin 22 is arranged. A fixed core 23 having a protrusion 23A that is fitted into the fitting hole 4 of the valve body 1 is fixedly disposed in the valve core 1, and the fixed core 23 is provided in the coil bobbin 22.
A movable core 24 is arranged so as to be movable in opposition to. An operating rod 25 is attached to the movable core 24 concentrically with the movable core 24, and one end of the operating rod 25 is supported by the bottom portion 20A of the housing 20 so as to be movable in the longitudinal direction. The other end of the operating rod 25 has a fixed core 23.
The other end 25B of the operating rod 25 projects leftward from the other end surface 23B of the protrusion 23A of the fixed core 23 in the figure by a bearing 26 provided on the.

Then, the protrusion 23A of the fixed core 23 of the solenoid portion S is fitted and fixed in the fitting hole 4 of the valve body 1 so that the solenoid portion S is fixed to the valve portion V and the linear solenoid valve R. Is formed. In this state, the valve body 6 has the other end 6B at the valve body pressing spring 15
Is elastically pressed to the right in the figure by
One end 6A of the valve body 6 elastically contacts the other end 25B of the operating rod 25.

[0005]

According to such a conventional linear solenoid valve, the coil 21 of the solenoid section S is
When the power is applied to the movable core 24, the movable core 24 is attracted and moved toward the fixed core 23, and the operating rod 25 integrally attached to the movable core 24 resists the elastic force of the valve body pressing spring 15 to the left. According to this, the second flow path P2 and the third flow path P3 are cut off, the third flow path P3 and the fourth flow path P4 are communicated with each other, and are generated in the hydraulic pressure source 10. High-pressure oil is supplied from the high-pressure oil passage 11 toward the control oil passage 9. This hydraulic pressure is supplied from the control oil passage 9 to the hydraulically actuated valve 8 and into the reaction force chamber 12 via the orifice 13 and the sixth flow passage P6, and is supplied to the reaction force chamber 12. The hydraulic pressure and the elastic force of the valve element pressing spring 15 act on the other end 6B of the valve element 6 as a reaction force to press the valve element 6 toward the actuating rod 25 (right in the figure). As a result, the valve body 6 moves left and right so as to balance the electromagnetic thrust to the left of the actuating rod 25 by the movable core 24 and the reaction force, and the hydraulic actuating portion 8 has a current flowing through the coil 21 of the solenoid portion S. A hydraulic pressure proportional to the value can be supplied.

The valve body pressing spring 15 contracted in the reaction force chamber 12 has an error in elastic force (spring force) with respect to a set length which the spring itself has at the time of manufacture.
Alternatively, the elastic force of the valve body pressing spring 15 is adjusted by rotating the spring adjusting screw 14 in order to adjust the elastic force when the hydraulic pressure is set. On the other hand, both ends of the valve body pressing spring 15 are directly locked to the spring adjusting screw 14 and the other end 6B of the valve body 6, and in this state, the spring adjusting screw 14 is rotated so that the elasticity of the valve body pressing spring 15 is increased. When the force is adjusted, both ends of the valve body pressing spring 15 are locked, so that the twisting force remains inside the valve body pressing spring 15. Further, as described above, the twisting force is also generated when the valve body 6 is moved left and right to obtain the balance between the electromagnetic thrust of the operating rod 25 and the above-mentioned reaction force. That is, the valve body 6 moves to the left and the valve body pressing spring 15
Is bent in the contracting direction, a twisting force is generated inside the valve body pressing spring 15, and when the valve body 6 moves rightward to release the bending of the valve body pressing spring 15, the twisting force is opposite to the above-mentioned twisting force. Directional twisting force is generated. When the twisting force remains or is generated inside the valve body pressing spring 15, the valve body 6 receives a radial load due to the twisting force. Therefore, when the valve body 6 moves to the left and right, friction occurs on the outer periphery of the valve body 6, and the movement locus of the valve body 6 varies. As a result, a hysteresis (pressure difference) may occur in the control oil pressure when the valve body 6 moves left and right, which is not preferable.

The linear solenoid valve according to the present invention is
It is possible to prevent the twisting force from remaining or being generated inside the valve body pressing spring, and to perform extremely accurate hydraulic control without causing hysteresis in the control hydraulic pressure during hydraulic control during lateral movement of the valve body. An object of the present invention is to provide a linear solenoid valve that can be used.

[0008]

According to the present invention, in order to achieve the above object, a valve body guide hole is bored in the valve body along the longitudinal direction, and a plurality of flow passages are provided in the valve body guide hole. A valve portion in which a passage is opened and a valve body for controlling the opening of the flow passage is movably arranged in the valve body guide hole, and a coil, a fixed core, a movable core, and a movable core are integrated in a housing. And a spring adjusting member attached to the valve body facing the other end of the valve body. In a linear solenoid valve in which one end of the valve body is elastically biased against the other end of the actuating rod and abuts, the linear solenoid valve is arranged coaxially with the valve body between the other end of the valve body and the spring adjusting member. A transmission member that can move in the moving direction of the valve body is arranged to press the valve body. The first feature is that the pulling is contracted between the spring adjusting member and the other end of the transmission member, and the elastic force of the valve body pressing spring is applied to the other end of the valve body via one end of the transmission member. .

In addition to the first characteristic, the present invention has a second characteristic that one end of the transmission member and the other end of the valve element are in contact with each other by a spherical surface and a flat surface.

Further, in addition to the first feature, the present invention provides
A third feature is that one end of the transmission member and the other end of the valve body are brought into contact with each other through a conical concave hole formed in a spherical surface and a flat surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the linear solenoid valve according to the present invention will be described below with reference to FIG. Note that the same reference numerals are used for the same structural parts as those in FIG. 4, and the description thereof will be omitted. The valve body guide hole 3 penetrates the valve body 1 in the longitudinal direction, and the reaction force chamber 12
And a reaction force chamber 12 between the other end 6B of the valve body 6 movably arranged in the valve body guide hole 3 and the spring adjusting screw 14 screwed into the female screw hole 5 of the valve body 1. The transmission member 30 is arranged in the valve body guide hole 3 so as to be rotatable and movable in the longitudinal direction of the valve body guide hole 3. Specifically, this transmission member 3
0 has a cylindrical shape and is disposed on the other end side of the valve body guide hole 3, one end 30A of the transmission member 30 faces the other end 6B of the valve body 6, and the other end 30B of the transmission member 30 has a spring adjusting screw 14 To face. Further, one end of the valve body pressing spring 15 contracted in the reaction force chamber 12 has the other end 30 of the transmission member 30.
B, and the other end of the valve body pressing spring 15 is locked on the spring adjusting screw 14. That is, with the valve body pressing spring 15 contracted between the spring adjusting screw 14 and the transmission member 30, one end 3 of the transmission member 30 is
0A is pressed by the other end 6B of the valve body 6 and the valve body 6 is pressed to the right in the figure, and one end 6A of the valve body 6 is elastically pressed and abutted against the other end 25B of the operating rod 25. . And
Similarly to the conventional example, when the coil 21 of the solenoid S is energized, the valve body 6 is affected by the electromagnetic thrust of the operating rod 25, the pressing force of the hydraulic pressure in the reaction chamber 12, and the elastic force of the valve body pressing spring 15. By moving left and right so as to balance with the reaction force, hydraulic pressure proportional to the current value flowing in the coil 21 is supplied to the hydraulic operating unit 8 via the control oil passage 9.

According to the linear solenoid valve R of the present invention, in particular, one end of the valve body pressing spring 15 is not directly locked to the other end 6B of the valve body 6 and the valve body is interposed via the transmission member 30. The elastic force of the pressing spring 15 is applied to the valve body 6
Since the elastic force of the valve body pressing spring 15 is adjusted by rotating the spring adjusting screw 14, the rotating force is applied to the valve body pressing spring 15 by rotating the spring adjusting screw 14. But,
As soon as the valve body pressing spring 15 receives the rotational force,
Transmission member 3 in which one end of the valve body pressing spring 15 is locked
0 receives the rotational force and immediately rotates in the same direction as the rotational force. This is because the length of the transmission member 30 in the longitudinal direction is extremely shorter than the length of the valve body 6 in the longitudinal direction.
This is because the resistance to rotation is extremely small. Further, when the valve body 6 moves to the left and right, the valve body pressing spring 15 generates a twisting force, but similarly to the above, the transmission member 30 receives the twisting force and releases the twisting force.
It rotates instantly.

According to the above, the twisting force does not remain or occur inside the valve body pressing spring 15, and the elastic force is uniformized when the transmission member 30 moves to the valve body 6 in the left and right directions. In addition, it was possible to act in the same direction. Thus, when the valve body 6 moves left and right so as to balance the electromagnetic thrust and the reaction force of the operating rod 25, the movement locus of the valve body 6 during the rightward movement and the leftward movement of the valve body 6 is shown. Can be the same,
As a result, the movement of the valve body 6 can be accurately and proportionally controlled in proportion to the current value flowing through the coil 21, and extremely accurate hydraulic control without hysteresis (pressure difference) can be performed. Is.

Further, since one end 30A of the transmission member 30 has a spherical shape and the other end 6B of the valve body 6 has a flat surface, the one end 30A of the transmission member 30 and the other end 6B of the valve body 6 contact each other. The contact is point contact, and when the transmission member 30 receives the rotational force of the valve body pressing spring 15, the transmission member 30 is more likely to rotate, and the twisting force of the valve body pressing spring 15 is further effective. Can be eliminated. Further, even when the center of the transmission member 30 in the longitudinal direction and the center of the valve body 6 in the longitudinal direction are misaligned, the elastic pressing force of the transmission member 30 in the longitudinal direction is exerted in the longitudinal direction of the valve body 6. Can be transmitted in a positive manner. In the embodiment shown in FIG. 2, one end 30A of the transmission member 30 has a flat surface and the other end 6B of the valve body 6 is provided.
The same action and effect can be obtained with a spherical surface.

Further, in the embodiment shown in FIG. 3, the transmission member 30 is used.
One end 30A of the is made a flat surface, and a conical concave hole 31 is bored in the central portion thereof along the longitudinal center of the transmission member 30,
On the other hand, the other end 6B of the valve body 6 has a spherical surface,
According to the present example, the movement of the transmission member 30 in the longitudinal direction acts by centripetally working toward the center of the valve body 6 in the longitudinal direction, and the elastic force of the valve body pressing spring 15 is effectively transmitted through the transmission member 30. It can act on the valve body 6. Further, the transmission member 30 and the other end of the valve body 6 are in annular contact,
The elastic force can be effectively applied from the transmission member 30 to the valve body 6. It is preferable that the outer diameter of the transmission member 30 is smaller than the outer diameter of the valve body 6 because the resistance against rotation of the transmission member 30 can be further reduced. or,
In the present embodiment, the spring adjusting member is the spring adjusting screw 14 screwed to the valve body 1, but it is of course possible to simply press-fit and fix the spring adjusting screw 14.

[0016]

As described above, according to the first feature of the present invention, the valve body is arranged concentrically with the valve body between the other end of the valve body and the spring adjusting member, and is arranged in the moving direction of the valve body. A transmission member that can move along is arranged, the valve body pressing spring is contracted between the spring adjusting member and the other end of the transmission member, and the elastic force of the valve body pressing spring is passed through one end of the transmission member. Since it is applied to the other end of the valve body, no twisting force remains or is generated in the valve body pressing spring, so that the hysteresis (pressure difference) in the lateral movement of the valve body can be completely suppressed, and thus accurate hydraulic control can be performed. It was something that could be done. Further, according to the second feature, since one end of the transmission member and the other end of the valve body are in contact with each other on the spherical surface and the flat surface, when the transmission member receives the rotational force by the valve body pressing spring, the transmission member is transmitted. It is possible to reduce the resistance to rotation of the transmission member, and to rotate the transmission member more favorably, and it is possible to effectively eliminate the twisting force of the valve body pressing spring 15. Further, according to the third feature, since one end of the transmission member and the other end of the valve body are brought into contact with each other by the conical concave hole formed in the spherical surface and the flat surface, the movement of the transmission member in the longitudinal direction can be prevented. The center of the body can be made to act toward the center in the longitudinal direction, and the elastic force of the valve body pressing spring can be effectively applied to the valve body via the transmission member.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a linear solenoid valve according to the present invention.

FIG. 2 is a side view of a main portion showing a contact surface shape of a contact portion between one end of the transmission member and the other end of the valve body.

FIG. 3 is a side view of a main part including a cross-sectional view of the main part showing another example of the contact surface shape of the contact part between one end of the transmission member and the other end of the valve body.

FIG. 4 is a vertical sectional view showing a conventional linear solenoid valve.

[Explanation of symbols]

 1 valve body 3 valve body guide hole 6 valve body 6A one end of valve body 6B other end of valve body 14 spring adjusting screw 15 valve body pressing spring 20 housing 21 coil 23 fixed core 24 movable core 25 operating rod 25B other end of operating rod 30 transmission member 30A One end of transmission member

Claims (3)

[Claims] 1. A valve body guide hole 3 is bored along a longitudinal direction in a valve body 1, and a plurality of flow paths P1 to P6 are bored in the valve body guide hole 3 so as to be bored. A valve portion V in which a valve body 6 for controlling the opening of the flow passage is movably arranged in a valve body guide hole, and a coil 21, a fixed core 23, a movable core 24, and a movable core 24 are integrally mounted in a housing 20. And a solenoid portion S provided with the actuated rod 25,
A valve body pressing spring is contracted between the other end 6B of the valve body 6 and a spring adjusting member 14 attached to the valve body 1 so as to face the other end, and one end 6A of the valve body 6 is the other end of the operating rod 25. 25
In the linear solenoid valve that is elastically urged and abutted against B, the other end 6B of the valve body 6 and the spring adjusting member 1
4 is disposed concentrically with the valve body 6 and the valve body 6
A transmission member 30 that can move along the moving direction of
The valve body pressing spring 15 is contracted between the spring adjusting member 14 and the other end 30B of the transmission member 30, and the elastic force of the valve body pressing spring 15 is passed through one end 30A of the transmission member 30 to the other end of the valve body 6. A linear solenoid valve characterized by being added to 6B. 2. The linear solenoid valve according to claim 1, wherein the one end 30A of the transmission member 30 and the other end 6B of the valve body 6 abut on a spherical surface and a flat surface. 3. The conical concave hole 31 for making one end 30A of the transmission member 30 and the other end 6B of the valve body 6 in a spherical surface and a flat surface abut on each other. Linear solenoid valve.