JPH06103072B2 - Electromagnetic proportional hydraulic control valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electromagnetic proportional hydraulic control valve used in, for example, a clutch control device for an automobile.

[Prior Art] As an electromagnetic proportional hydraulic control valve of this type, for example, a normally open type is proposed in Japanese Utility Model Application No. 60-161420. As shown in FIG. 1, the hydraulic control valve A described above includes a main control valve unit 1, a pilot control valve unit 2, and an electromagnetic actuator 3 that drives the pilot control valve unit 2. The main control valve portion 1 is composed of a housing 6 having a stepped valve chamber having a large diameter cylindrical portion 4 and a small diameter cylindrical portion 5, and a stepped spool 7 slidably fitted in the housing 6.

The pilot control valve portion 2 arranged at the right end portion of the housing 6 is a poppet valve 11 including a valve seat member 8 fitted in the housing 6 and a valve body 10 biased in an opening direction by a spring 9.
It is composed of

The electromagnetic actuator 3 includes a cylindrical solenoid assembly 12. At the left end of the solenoid assembly 12, a partition wall body 13 made of a magnetic material is joined to a sleeve 13a made of a non-magnetic material.
And a sleeve 14 made of a magnetic material is fitted to the right end of the solenoid assembly 12. Plunger 15 and iron core 16 are fitted in a hollow portion formed by partition wall body 13 and sleeve 14. Spring that penetrates through hole 18 formed in partition wall body 13
17 is interposed between the valve body 10 and the plunger 15. A spring 19 for suppressing flapping of the plunger 15 is interposed between the plunger 15 and the iron core 16.

The solenoid assembly 12 that drives the plunger 15 to the left
Cylindrical reel 12a, electromagnetic coil 12b, and cylindrical iron core 12c
And an annular iron core 12d. The electromagnetic actuator 3 including the solenoid assembly 12 is housed inside a cup-shaped housing 20.

[Problems to be Solved by the Invention] In the electromagnetic proportional hydraulic control valve as described above, the main control valve portion 1
At least the housing 6 and the stepped spool 7 must be exchanged in order to obtain a control characteristic of the reverse control of. Therefore, there is a problem in that it takes time and effort to manage parts, such as preparing two kinds of parts such as the housing 6, and the cost of parts increases.

In view of the above problems, an object of the present invention is to provide an electromagnetic proportional hydraulic control valve capable of changing the control direction of the main control valve portion to the reverse characteristic.

[Means for Solving the Problem] In order to achieve the above object, the structure of the present invention connects a pilot control valve section between a main control valve section and an electromagnetic actuator, and drives the pilot control valve by the electromagnetic actuator. In an electromagnetic proportional hydraulic control valve that adjusts the pilot hydraulic pressure in the pilot chamber at the end of the main control valve by a pilot control valve, the electromagnetic actuator is a pair of annular partition plates made of magnetic material at both ends of the reel of the electromagnetic coil. Plunger and pilot control in which sleeves of different lengths that are integrally formed with each partition plate are inserted into the inside of the winding frame with an axial gap, and are slidably inserted into a pair of sleeves. A first spring penetrating one of the partition plates is inserted between the valve body and the valve body, and a second spring is interposed between the plunger and the other partition plate. The first and second springs are electromagnetic. Turn off coil When the plunger is that configured to hold the position to be fitted to a long sleeve away from the short sleeve.

[Operation] Partition walls having sleeves of different lengths are recombinably joined to both ends of the winding frame around which the electromagnetic coil is wound, and each sleeve is fitted into the winding frame. Plungers are slidably fitted in sleeves of different lengths. A first spring penetrating one partition plate is interposed between the plunger and the valve body of the pilot control valve, and a second spring is interposed between the plunger and the other partition plate.

When the electromagnetic coil is demagnetized, the plunger is located in the longer sleeve, and when the electromagnetic coil is excited, it moves inside the shorter sleeve to move the valve body of the pilot control valve from the open position to the closed position or to the closed position. To open direction.

The operating characteristics of the main control valve are determined by the control direction of the valve body of the pilot control valve, and the control direction of the valve body of the pilot control valve is such that a partition plate having a long or short sleeve is arranged adjacent to the pilot control valve section. It depends on whether or not, that is, by changing the partition plate.

[Embodiment of the Invention] Next, a specific embodiment of the electromagnetic proportional hydraulic control valve according to the present invention will be described with reference to the drawings. First, an electromagnetic proportional hydraulic control valve having a positive control characteristic in the main control valve portion will be described, and then an electromagnetic proportional hydraulic control valve having a reverse characteristic will be described.

As shown in FIG. 2, an electromagnetic proportional hydraulic control valve A having a positive control direction has a main control valve portion 21 and a pilot control valve portion 22.
And an electromagnetic actuator 23. The main control valve portion 21 is provided with a stepped valve chamber 27 including a large diameter cylindrical portion 25 and a small diameter cylindrical portion 26 in a housing 24, and a stepped spool 28 is slidably fitted in the stepped valve chamber 27. To be done. A lid 29 is fitted on the left end of the large-diameter cylindrical portion 25, and is fixed by a retaining ring 30. At the left end of the large-diameter cylindrical portion 25 closed by the lid 29, a chamber 34 is defined together with the cylindrical portion 33 of the stepped spool 28. The valve seat member 31 of the pilot control valve portion 22 is fitted to the right end portion of the housing 24 via a seal member 32. Small diameter cylindrical part 26
A pilot chamber 36 is defined by the cylindrical portion 35 of the stepped spool 28 and the valve seat member 31 at the right end portion of the.

The annular groove 37 formed in the large-diameter cylindrical portion 25 is connected to the oil tank 39 via the drain 38. Annular groove 40 formed in the small diameter cylindrical portion 26
Is connected via an inlet 41 to the discharge port of a hydraulic pump (not shown). An annular groove 42 formed between the large-diameter cylindrical portion 25 and the small-diameter cylindrical portion 26 is connected via an outlet 43 to a hydraulic operating device such as a clutch control hydraulic actuator in an automatic transmission.

A notched cylindrical portion 44 having a slightly larger inner diameter and a shorter axial length than the large-diameter cylindrical portion 25 is formed adjacent to the right side of the annular groove 37. Similarly, adjacent to the left side of the annular groove 40, a notched cylindrical portion 45 having an inner diameter slightly larger than the small diameter cylindrical portion 26 and a shorter axial length is formed.

The stepped spool 28 has a large diameter portion 46 having a cylindrical portion 33 on the left end side.
And a small diameter portion 47 having a cylindrical portion 35 on the right end side. The stepped spool 28 is normally pressed against the valve seat member 31 by a return spring 48 interposed between the large diameter portion 46 and the lid 29. Between the large diameter portion 46 and the small diameter portion 47 of the stepped spool 28,
The diameter is smaller than that of the small-diameter portion 47, so that a wide annular space 49 is formed. Normally, the annular space 49 communicates with the annular groove 40 via the annular groove 42 and the notched cylindrical portion 45, and when the stepped spool 28 moves to the left against the force of the return spring 48, the annular space 49 becomes the annular groove 42. It is formed so as to communicate with the annular groove 37 via. An orifice 50, which constantly connects the annular groove 40 to the pilot chamber 36, is formed in the small diameter portion 47 of the stepped spool 28.

The pilot control valve section 22 includes a poppet valve 53 in which a valve body 52 is housed in a valve chamber 51 inside a valve seat member 31. Disc 52
Is urged in the opening direction by a spring 54, and the electromagnetic actuator 23 causes an orifice between the pilot chamber 36 and the valve chamber 51.
Configured to close 55. The valve seat member 31 has a tapered intermediate outer peripheral portion, and a split groove 56 is formed at the right end portion.
The valve chamber 51 always communicates with the oil tank 58 through the split groove 56 and the outlet 57.

The electromagnetic actuator 23 is connected to the right end portion of the housing 24 and includes a cylindrical solenoid assembly 59. The solenoid assembly 59 has an annular partition plate 62 made of a magnetic material at the left end.
The short sleeve 62a that is joined to the partition wall plate 62
It is inserted into 9a. An annular partition wall plate 63 made of a magnetic material is joined to the right end of the solenoid assembly 59, and a long sleeve 63a integral with the partition wall plate 63 is fitted into the winding frame 59a. Sleeve 62
A thin-walled cylindrical member 65 made of a non-magnetic material is fitted into the inner space of a, 63a. Sleeve 62a and sleeve 63 inside reel 59a
An axial gap is provided between a.

A plunger 64 having an orifice 66 is slidably inserted into the thin cylindrical member 62. The right end side of the sleeve 63a also has a function as a stopper for the plunger 64,
A plug 68 made of a non-magnetic material having a through hole 67 is fitted.
As described above, the partition plate 63 and the partition plate 62 form both end wall portions of the cylindrical solenoid assembly 59. The partition plate 62 is joined to the right end portion of the housing 24, specifically, the valve seat member 31 of the pilot control valve portion 22. A first spring 70 penetrating the through hole 61 is interposed between the valve body 52 and the plunger 64. A second spring 69 that suppresses flapping of the plunger 64 is interposed between the plunger 64 and the plug 68. The spring 54, which is stronger than the spring 69,
The valve body 52 is pressed against the partition plate 62.

In the solenoid assembly 59, an electromagnetic coil 59b is wound around a tubular winding frame 59a, a cylindrical iron core 59c is fitted around the electromagnetic coil 59b, and an annular iron core 59d is fitted at the left end of the winding frame 59a. Become. The electromagnetic actuator 23 including the solenoid assembly 59, the partition plate 62, and the partition plate 63 is fitted inside the housing 71. The lid 72 made of an elastic material closes the through hole 67 of the stopper 68 and absorbs a dimensional error in the axial direction.

Next, the operation of the electromagnetic proportional hydraulic control valve according to the present invention will be described separately for when the electromagnetic coil 59b is in the non-excited state and when it is in the excited state.

(I) De-energized state When the electromagnetic coil 59b of the electromagnetic actuator 23 is in the de-energized state, the plunger 64 is separated from the shorter sleeve 62a and held in the longer sleeve 63 by the first and second springs 70 and 69. Has been done. The valve body 52 is separated from the valve seat member 31 by the force of the spring 54 and is pressed against the partition plate 62. Therefore, the pressure oil that has entered the annular groove 40 through the inlet 41 from the hydraulic pump enters the pilot chamber 36 through the orifice 50 of the stepped spool 28, and further the orifice 55, the valve chamber 51, the split groove 56, and the outlet 57. Return to oil tank 58 via.

Since the stepped spool 28 is pressed against the valve seat member 31 by the force of the return spring 48, the passage area of the notched cylindrical portion 45 is maximized. The primary pressure oil from the hydraulic pump is
It enters the annular groove 42 from 41 through the annular groove 40, the notched cylindrical portion 45, and the annular space 49, and is sent from the outlet 43 to the hydraulically operated device. At this time, the secondary pressure of the oil sent from the outlet 43 to the hydraulically actuated device is maximum.

(II) Excited state When the electromagnetic coil 59b of the electromagnetic actuator 23 is excited, the plunger 64 moves to the left, and the valve body is moved through the spring 70.
Push 52 to the left against the force of spring 54. Valve body 52 and valve seat member
The gap with 31 is narrowed, and the pilot hydraulic pressure in the pilot chamber 36 increases. The pilot control valve section 22 functionally constitutes an electromagnetic relief valve. The stepped spool 28 is pushed to the left by the pilot hydraulic pressure and settles in a position that balances the force of the return spring 48. The passage area of the notched cylindrical portion 45 becomes narrower according to the leftward movement amount of the stepped spool 28. The primary pressure oil from the hydraulic pump enters the annular groove 42 through the inlet 41, the annular groove 40, the notched cylindrical portion 45, and the annular space 49, and is sent from the outlet 43 to the hydraulically operated equipment. At this time, the secondary pressure of the oil sent from the outlet 43 to the hydraulically operated device is reduced.

When a sudden and excessive hydraulic pressure acts on the inlet 41, the stepped spool 28 temporarily moves largely to the left, and the passage of the notched cylindrical portion 45 is closed by the small diameter portion 47 of the stepped spool 28. The annular space 42 allows the annular groove 42 to communicate with the notched cylindrical portion 44, and the hydraulic pressure in the annular space 49 is released to the oil tank 39 through the notched cylindrical portion 44, the annular groove 37, and the drain 38. Therefore, the rise of the secondary pressure is suppressed and the secondary pressure is always maintained at a substantially constant value.

Next, an electromagnetic proportional hydraulic control valve A having a reverse control direction will be described with reference to FIG. 3, but the same reference numerals as those used in FIG. 2 indicate the same contents, and a duplicate description will be omitted. The electromagnetic actuator 23, which includes the solenoid assembly 59, the partition plate 62, and the partition plate 63, has the housing 71 in an inverted state.
Is fitted inside. In other words, the longer sleeve 63a
A partition plate 63 having a is disposed adjacent to the pilot control valve section 22. The spring 70 'fitted in the through hole 67 of the stopper 68 is
It is interposed between the plunger 64 and the valve body 52. A spring 69 'is interposed between the partition plate 62 and the plunger 64. The lid 72 closes the through hole 61 of the partition plate 62.

Next, in the operation of the electromagnetic proportional hydraulic control valve according to the present invention,
The electromagnetic coil 59b will be described separately when it is in the non-excited state and when it is in the excited state.

(I) De-energized state When the electromagnetic coil 59b of the electromagnetic actuator 23 is in the de-energized state, the plunger 64 moves away from the shorter sleeve 62a and into the longer sleeve 63a, and the first and second springs 70 ', 6
Held by 9 '. The valve body 52 is in contact with the valve seat member 31 due to the force relationship between the three springs 54, 69 ′ and 70 ′.
Therefore, the pilot hydraulic pressure in the pilot chamber 36 is high, and the stepped spool 28 is pushed to the left by the pilot hydraulic pressure.

(II) Excited state When the electromagnetic coil 59b of the electromagnetic actuator 23 is excited, the plunger 64 moves to the right and the force of the spring 54 moves the valve body 52 to the right. The gap between the valve body 52 and the valve seat member 31 is widened, and the pilot hydraulic pressure in the pilot chamber 36 becomes low. The stepped spool 28 is pushed to the right by the force of the return spring 48, the passage area of the notched cylindrical portion 45 is increased, and the secondary pressure of the oil sent from the outlet 43 to the hydraulically operated device is increased. Valve body 52 is plugged
When it is pressed against 68 and the stepped spool 28 is pressed against the valve seat portion 31, the passage area of the notched cylindrical portion 45 becomes maximum,
The secondary pressure at the outlet 43 becomes maximum. The other operations are the same as those of the electromagnetic proportional hydraulic control valve having the positive control characteristic in the control direction shown in FIG.

Thus, by reversing the arrangement of the electromagnetic actuator 23 and replacing the two springs 69, 70 with springs 69 ', 70',
A characteristic in which the control direction of the main control valve portion 21 is reversed can be obtained.

[Effects of the Invention] As described above, the present invention can change the control direction of the main control valve portion to the normal characteristic or the reverse characteristic by changing the electromagnetic actuator, particularly the pair of partition plates to the normal arrangement or the reverse arrangement. Therefore, parts can be shared, part management becomes easy, and part cost can be reduced.

It is possible to easily establish a production system capable of swiftly responding to a situation in which the characteristics of the control direction are suddenly changed.

[Brief description of drawings]

FIG. 1 is a front sectional view of a conventional electromagnetic proportional hydraulic control valve,
FIG. 3 is a drawing for explaining the electromagnetic proportional hydraulic control valve according to the present invention, FIG. 2 is a front sectional view of the electromagnetic proportional hydraulic control valve in which the electromagnetic actuator is normally arranged, and FIG. 3 is a reverse electromagnetic actuator. It is a front sectional view of an electromagnetic proportional hydraulic control valve arranged. 21: Main control valve section, 22: Pilot control valve section, 23: Electromagnetic actuator, 36: Pilot chamber, 52: Valve body, 59: Solenoid assembly, 59a: Reel, 59b: Electromagnetic coil, 62, 63: Partition wall Board,
62a: short sleeve, 63a: long sleeve, 64: plunger, 69,69 ': second spring, 70,70': first spring

Claims (1)

[Claims] 1. A pilot control valve unit is connected between a main control valve unit and an electromagnetic actuator, the pilot actuator is driven by the electromagnetic actuator, and the pilot control valve drives the pilot control valve. In the electromagnetic proportional hydraulic control valve, the electromagnetic actuator has a pair of annular partition plates made of a magnetic material joined to both ends of the winding frame of the electromagnetic coil, and sleeves of different lengths formed integrally with each partition plate. Is inserted into the inside of the bobbin with an axial gap, and one partition wall plate is penetrated between the plunger and the valve body of the pilot control valve, which are slidably fitted in a pair of sleeves. Second springs are respectively interposed between the plunger and the other partition plate, and the first and second springs have their plungers separated from the short sleeve and fitted into the long sleeve when the electromagnetic coil is demagnetized. Characterized by being configured to hold a position, electromagnetic proportional pressure control valve.