JPH0861543A - Linear solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the hysteresis of the control oil pressure when the valve body 6 moves left and right. [Structure] The valve body 6 is provided with a hydraulic pressure introducing passage 30 that opens to a fourth passage P4 that is continuous with the high-pressure oil passage 11. From the hydraulic pressure introduction passage 30 toward the outer periphery of the valve body 6, a single hydraulic pressure injection hole 31
Are provided along the longitudinal direction of the valve body 6. Each single hydraulic injection hole 31 is opened so as to face each valve body bearing hole H formed by the valve guide hole 3 and is opened in the same direction in the cross section 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 the valve body 6 and
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.) In the valve body guide hole 3, the portion of the valve body guide hole 3 that does not open to each of the flow paths P1 to P6 is a valve. The valve body bearing hole portion H supports the body 6 so as to be movable in the longitudinal direction, and the valve body guide hole 3 between adjacent flow paths serves as the valve body bearing hole portion H. For example, the first flow path P
Between the first flow path P2 and the second flow path P2, or between the fourth flow path P4 and the fifth flow path P4.
The valve body bearing hole portion H is formed between the flow passage P5 and the flow passage P5.

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 hydraulic operating portion 8 and is supplied into the reaction force chamber 12 via the orifice 13 and the sixth flow path P6. 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. In this way, the valve body pressing spring 1
When a twisting force remains in the inside of the valve 5, when the valve body 6 moves left and right to obtain the balance between the electromagnetic thrust of the operating rod 25 and the above-mentioned reaction force as described above, the valve body 6 moves in the right direction. There is a difference in the movement locus of the valve body 6 during the movement and the leftward movement, and as a result, a hysteresis (pressure difference) may occur in the control oil pressure when the valve body 6 moves left and right,
Not preferred.

The linear solenoid valve according to the present invention is
An object of the present invention is to provide a linear solenoid valve capable of performing extremely accurate hydraulic pressure control without causing hysteresis (pressure difference) in the control hydraulic pressure during hydraulic pressure control when the valve element is moved left and right.

[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. Road P1
To P6 are opened and drilled, and a valve portion in which a valve body for controlling the opening of the flow path is movably arranged in the valve body guide hole, and a coil, a fixed core, a movable core and a movable core in the housing. A valve body pressing spring is contracted between the other end of the valve body and a spring adjusting member attached to the valve body facing the other end and a solenoid portion having an operating rod integrally attached thereto. In the linear solenoid valve in which one end of the valve element is elastically urged against the other end of the operating rod to abut,
In the valve body, a hydraulic pressure introducing passage that opens to the fourth flow passage communicating with the high pressure oil passage is formed, and a single hydraulic injection hole extends from the hydraulic introducing passage toward the outer periphery of the valve body along the longitudinal direction of the valve body. And a plurality of the single hydraulic injection holes are formed so as to face the respective valve body bearing hole portions H formed by the valve body guide holes and to open in the same direction in the cross section of the valve body. It is characterized by having done.

[0009]

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. 3, and the description thereof will be omitted. The valve body 6 movably arranged in the valve body guide hole 3 in the longitudinal direction thereof is provided with a hydraulic pressure introduction passage 30 and a hydraulic pressure injection hole 31 branching from the hydraulic pressure introduction passage 30. The hydraulic pressure introducing passage 30 is provided with a first hydraulic pressure introducing passage 30 </ b> A formed in the transverse section of the valve body 6 facing the fourth passage P <b> 4 and a first hydraulic introducing passage formed in the longitudinal direction of the valve body 6. The second hydraulic pressure introducing passage 30B is connected to 30A, and the high-pressure oil boosted by the hydraulic pressure source 10 is supplied into the fourth flow passage P4 via the high-pressure oil passage 11, and the inside of the fourth flow passage P4. High-pressure oil is supplied from the first hydraulic pressure introducing passage 30A into the second hydraulic pressure introducing passage 30B. The second hydraulic pressure introducing passage 30B in the present embodiment is bored in the longitudinal direction toward the right end 6A from the other end 6B of the valve body 6,
The opening at the other end 6B of the valve body 6 of the second hydraulic pressure introduction passage 30B is closed by the plug P.

On the other hand, the hydraulic injection hole 31 is formed as follows. The hydraulic pressure injection hole 31 is branched from the second hydraulic pressure introduction path 30B of the hydraulic pressure introduction path 30 and opens to the outer circumference of the valve body 6, and a single hydraulic pressure injection hole 31 has a plurality of gaps in the longitudinal direction of the valve body 6. Was drilled. The hydraulic injection hole 31 is opposed to the valve body bearing hole portion H formed by the valve body guide hole 3 that does not open in the adjacent flow passages P1 to P6, and is opened in the present embodiment. Is the valve body bearing hole portion H between the first flow passage P1 and the second flow passage P2, the valve body bearing hole portion H between the fourth flow passage P4 and the fifth flow passage P5, and the fifth flow. Road P5 and 6th
Three single hydraulic injection holes 31 are provided for each of the valve body bearing hole portions H between the flow passage P6 and the flow passage P6. The openings of the respective hydraulic injection holes 31 with respect to the outer circumference of the valve body 6 are opened in the same direction in the cross section of the valve body 6 (cross section orthogonal to the longitudinal direction of the valve body 6). That is, in the present embodiment, the holes are bored upward from the second hydraulic pressure introducing passage 30B in the vertical direction. The opening of the hydraulic injection hole 31 is well shown in FIGS.

Then, as in the conventional example, the solenoid S
When the coil 21 is energized, the valve body 6 balances the electromagnetic thrust of the actuating rod 25, the pressing force of the hydraulic pressure in the reaction force chamber 12, and the reaction force of the elastic force of the valve pressing spring 15. Flow path P that is moved left and right as described above, and the high-pressure oil generated by the hydraulic pressure source 10 is supplied through the high-pressure oil passage 11.
The high-pressure oil in 4 is supplied to the hydraulic working chamber 8 via the third flow passage P3 and the control oil passage 9, and the hydraulic pressure proportional to the current value flowing in the coil 21 could be supplied to the hydraulic working chamber 8. It is a thing.

According to the linear solenoid valve of the present invention, the high pressure oil (for example, the pressure is increased to 5 Kg / Cm2) supplied into the fourth passage P4 through the high pressure oil passage 11 is the valve body 6. Through the first hydraulic pressure introducing passage 30A provided in the inside of the second hydraulic pressure introducing passage 30B, and the high-pressure oil is further discharged from a single hydraulic injection hole 31 opening along the longitudinal direction of the outer circumference of the valve body 6. The fuel is injected toward the corresponding valve body bearing hole portion H. Since the single hydraulic injection hole 31 is provided on the outer periphery of the valve body 6 in the same direction in the cross section of the valve body 6, the valve body 6 extends from the hydraulic injection hole 31 to the valve body bearing hole. The reaction force of the high-pressure oil injected toward the portion H supports the valve body bearing hole portion H (in other words, the valve body guide hole 3) on a fixed side. The one side determined in this embodiment is below the valve body bearing hole H.

On the other hand, as described above, the valve body pressing spring 15 contracted in the reaction force chamber 12 has an error in elastic force (spring force) with respect to the set length of the spring itself at the time of manufacture, or when the hydraulic pressure is set. In order to adjust the elastic force of the valve body, the elastic force of the valve body pressing spring 15 is adjusted by rotating the spring adjusting screw 14, for example. Since the adjusting screw 14 and the other end 6B of the valve body 6 are directly engaged, the valve body pressing spring 1
The twisting force will remain inside 5. The twisting force of the valve body pressing spring 15 causes the rightward movement of the valve body 6 to the left when the valve body 6 moves left and right to obtain a balance between the electromagnetic thrust of the operating rod 25 and the above-mentioned reaction force. At the time of movement, there is a fear that the movement locus of the valve body 6 may be different.

However, in the linear solenoid valve according to the present invention, the valve body 6 injects high-pressure oil from the hydraulic injection passage 31 toward the valve body bearing hole portion H, and the valve body 6 makes the valve body bearing hole portion H. Since the valve body 6 is supported in a fixed direction with respect to the (valve body guide hole 3), even if the torsional force of the valve body pressing spring 15 is applied from the other end 6B of the valve body 6, the valve body 6 is caused by the torsional force. The rotation or inclination of is suppressed,
When the valve body 6 moves to the right and to the left, the valve body 6 is in a constant position and the movement locus of the valve body 6 can be made the same. As described above, the lateral movement of the valve body 6 can be controlled accurately in proportion to the current value flowing in the coil 21 and on the same locus, and extremely accurate hydraulic control without hysteresis (pressure difference) is performed. I was able to do it. In this embodiment, the spring adjusting member is the spring adjusting screw 14 screwed to the valve body 1, but it may be simply press-fitted and fixed.

[0015]

As described above, according to the linear solenoid valve of the present invention, a hydraulic pressure introducing passage that opens to the fourth flow passage communicating with the high pressure oil passage is bored in the valve body, and the valve body is introduced from the hydraulic introducing passage. A plurality of single hydraulic injection holes are formed along the longitudinal direction of the valve body toward the outer periphery of the valve body, and each single hydraulic injection hole is formed by a valve body bearing hole portion formed by a valve body guide hole. Since it is opened facing H and is opened in the same direction in the cross section of the valve body, the valve body is placed in a fixed position with the injection pressure of the high pressure oil in the valve body guide hole including the valve body bearing hole. It is possible to support and position the valve body on the same trajectory when the valve body moves left and right,
As a result, the hysteresis (pressure difference) when the valve body is moved left and right can be completely suppressed, and thus accurate hydraulic control can be performed.

[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 longitudinal sectional view of a main part of the valve body taken along the line AA in FIG.

FIG. 3 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 11 high pressure oil passage 14 spring adjusting screw 15 valve body pressing spring 20 housing 21 coil 23 fixed core 24 movable core 25 operating rod 25B operation The other end of the rod 30 Hydraulic pressure introduction path 31 Hydraulic pressure injection hole H Valve body bearing hole P4 Fourth flow path S Solenoid part V Valve part R Linear solenoid valve

Claims (1)

[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 15 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 connected to the operating rod 25. In the linear solenoid valve that elastically urges and abuts against the end 25B, a hydraulic pressure introducing passage 30 that opens to the fourth flow passage P4 that communicates with the high pressure oil passage 11 is formed in the valve body 6, and the hydraulic introducing passage 30 is formed. A plurality of single hydraulic injection holes 31 are bored along the longitudinal direction of the valve body 6 toward the outer periphery of the valve body 6, and the single hydraulic injection holes are formed by the valve body guide holes 3. A linear solenoid valve which is opened so as to face each valve element bearing hole portion H and which is opened in the same direction in a cross section of the valve element 6.