JP4258938B2 - Solenoid valve and method for manufacturing solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a current-controlled electromagnetic variable relief valve used for hydraulic control, in particular, a solenoid valve applied to hydraulic control of an automatic transmission for automobiles, etc. And method for manufacturing solenoid valve It is about.
[0002]
[Prior art]
As a conventional solenoid valve of this type, for example, the one shown in FIG. 11 is known. The solenoid valve 101 includes a solenoid 102 and a valve unit 103.
[0003]
The solenoid 102 moves in the axial direction into a coil 104 wound in a cylindrical shape, a center post 105 fixedly arranged on the inner peripheral side of the coil 104, and a plunger chamber 106 formed on the valve portion 103 side of the center post 105. A plunger 107 that is freely inserted and a spring 108 that is inserted between the plunger 107 and the center post 100 and presses the plunger 104 against the valve portion side are provided.
[0004]
The valve unit 103 includes a spool valve 119 provided at the end of the plunger 107 and a valve sleeve 120 that slides on the outer periphery of the spool valve 119.
[0005]
The valve portion 103 is provided with a supply pressure port SP penetrating in the axial direction, the center post 105 is provided with a drain port DP, and further, a pilot pressure port PP is provided at the base position of the valve portion 103. .
[0006]
The solenoid 102 is energized and the plunger 107 is attracted to the center post 105 against the spring force of the spring 108, whereby the supply pressure port SP and the pilot pressure port PP are communicated to control the fluid. .
[0007]
[Problems to be solved by the invention]
However, the conventional solenoid valve 101 has the following problems.
[0008]
As a method for adjusting the control characteristics of the solenoid valve 101, there are generally a method for adjusting the set load of the spring 108 and a method for adjusting the valve stroke. In particular, in the method for adjusting the valve stroke, the center post 105 is screwed or press-fitted. It was common to move and adjust them equally.
[0009]
As a specific example of screwing of the center post 105, for example, a male screw part 105a is provided on the outer periphery of the center post 105, a female screw part 112a that engages with the male screw part is provided on the upper plate 112, and the male screw part 105a and the female screw part 112a are engaged with each other. The center post 105 is screwed into the solenoid 102 for adjustment, and then the center post 105 and the upper plate 112 are crimped to obtain a finished product.
[0010]
However, when the screwing or press-fitting of the center post 105 is adopted as a method for adjusting the effective valve stroke, the structure of the solenoid valve 101 itself becomes complicated because the center post 105 is movable, resulting in an increase in cost. End up.
[0011]
Then, in order to crimp the center post 105 and the upper plate 112 after completion of adjustment to obtain a finished product, if the control characteristics are deteriorated due to impact or the like at the time of crimping after completion of adjustment, the proper adjustment at the time of adjustment of the solenoid valve 101 is performed. Control characteristics may not be obtained in the finished product.
[0012]
Next, in this conventional solenoid valve 101, the spool valve 119 and the valve sleeve 120 slide the spool valve 119, and the spool valve 119 has an outer periphery of the spool valve 119 and an inner periphery of the valve sleeve 120. 119 may tilt with respect to the valve sleeve 120.
[0013]
When the spool valve 119 is tilted with respect to the valve sleeve 120, line contact is made at two points of the spool valve 119 tip and the valve sleeve 120 end when the valve is closed, but as shown in FIG. Only the edge of the opening 119a of the spool valve 119 and the edge of the end of the valve sleeve 120 may come into contact to form a point contact. When this point contact state is repeated, the point contact portion is worn away, and the control characteristics of the solenoid valve 101 may change.
[0014]
If the control characteristic of the solenoid valve 101 is changed due to wear of the point contact portion, the control characteristic will not be restored. This limits the durability of the solenoid valve 101, and the life of the solenoid valve 101 is extended. It was difficult to plan.
[0015]
Furthermore, in the conventional solenoid valve, as shown in FIG. 13, foreign matter (contamination) I contained in the fluid enters the clearance between the sliding surfaces of the spool valve 119 outer periphery and the valve sleeve 120 inner periphery of the sliding portion. And sliding resistance occurs. As a result, the spool valve 119 cannot move smoothly, and the control characteristics change to hinder the control function. Depending on the degree, the solenoid valve 101 may become inoperable due to the spool valve 119 being caught.
[0016]
Foreign matter that has entered the clearance section is carried by the flow of fluid and drops from the clearance section, so that the valve function is restored. However, the longer the sliding surfaces of the sliding section are, the longer the distance that the foreign body needs to drop off. In other words, the time until the valve function is restored becomes longer.
[0017]
Thus, the length of the sliding surfaces of the sliding portion should be short from the contamination-resistant surface of the clearance portion that stabilizes the control characteristics. On the other hand, the spool valve 119 described above is in contrast to the valve sleeve 120. In order to reduce the contact per piece when tilting, it is necessary to provide long sliding surfaces of the sliding portions or to provide the sliding portions at positions separated by two places.
[0018]
FIG. 14 shows an example in which two sliding portions on which the spool valve 119 and the valve sleeve 120 slide are provided. In FIG. 14, two sliding portions 119e and 119f having different diameters are provided. In such a case, it is difficult to manufacture with high accuracy, resulting in an increase in cost.
[0019]
The present invention solves the above-described problems of the prior art, and an object of the present invention is to provide a solenoid valve that can be easily manufactured to obtain stable control characteristics for a long period And method for manufacturing solenoid valve Is to provide.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides:
A center post fixed inside the solenoid;
A plunger provided opposite to the center post and movable in the axial direction;
A spool valve interlocked with the plunger;
A valve sleeve sliding on the outer peripheral surface of the spool valve;
In a solenoid valve with
The center post has a through hole penetrating in the axial direction,
The plunger and the spool valve are provided separately,
The spool valve is press-fitted into the plunger by a jig inserted from the inside of the valve sleeve and from both axial sides through the through hole of the center post, and the axial length of the plunger and the spool valve is The effective valve stroke is adjusted by adjusting the pressure according to the press-fitting amount.
[0021]
Here, the effective valve stroke refers to the difference from the position where the spool valve starts to open to the position where the maximum opening is achieved.
[0022]
Therefore, the valve stroke is adjusted so that the control characteristic of the solenoid valve becomes appropriate, and the subsequent incorporation of the parts does not affect the control characteristic, so that a finished solenoid valve having a good quality with appropriate control characteristics can be obtained.
[0023]
Further, since adjustment is possible with a simple configuration in which the plunger and the spool valve are separated, the cost can be reduced as compared with the prior art.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0035]
(First embodiment)
First, a hydraulic control system for hydraulic control of an automotive automatic transmission to which the solenoid valve of the present embodiment is applied will be described with reference to FIG.
[0036]
In FIG. 5, a pressure reducing valve 502 is connected to a line pressure oil passage 501 to which a line pressure L is supplied, and a solenoid supply pressure S controlled to a constant pressure by the pressure reducing valve 502 is supplied by a solenoid supply pressure oil passage 503. Then, it is guided to the supply pressure port SP of the solenoid valve 1.
[0037]
In addition to the supply pressure port SP, the solenoid valve 1 is provided with a drain port DP and a pilot pressure port PP. The pilot pressure P controlled by the solenoid valve 1 from the pilot pressure port PP is supplied to the spool valve 505. To the pilot pressure oil passage 504 leading to
[0038]
A line pressure oil passage 501, a pilot pressure oil passage 504, and an output pressure oil passage 506 are connected to the spool valve 505. Then, the output pressure O guided to the output pressure oil passage 506 by the spool valve 505 is controlled by the line pressure L which is the base pressure and the pilot pressure P which is the operation signal pressure controlled by the solenoid valve 1.
[0039]
The output pressure oil passage 506 is connected to a piston oil chamber such as a clutch when not shown, and controls the clutch and the like according to the magnitude of the output pressure.
[0040]
In the hydraulic control system described above, when the solenoid valve 1 is energized, the supply pressure port SP and the pilot pressure port PP communicate with each other, and the drain port DP is shut off. Further, when the power is not supplied, the supply pressure port SP is cut off, and the pilot pressure port PP and the drain port DP are communicated.
[0041]
As a result, the pilot pressure P of the pilot pressure oil passage 504 can be controlled in the range of 0 to the solenoid supply pressure S.
[0042]
The configuration of the solenoid valve will be described with reference to FIG. The solenoid valve 1 includes a solenoid 2 and a valve unit 3.
[0043]
The solenoid 2 moves in the axial direction into a coil 4 wound in a cylindrical shape, a center post 5 fixedly disposed on the inner peripheral side of the coil 4, and a plunger chamber 6 formed on the valve portion 3 side of the center post 5. A plunger 7 that is freely inserted and is provided to face the center post 5, and a spring 8 that is inserted between the plunger 7 and the center post 5 and presses the plunger 7 against the valve portion 3 side. ing.
[0044]
The solenoid 2 has a configuration in which the coil 4 is wound around the bobbin 9, the center post 5 is fitted to the inner periphery of the half of the bobbin 9 on the side opposite to the valve portion 3, and the valve portion 3 side half is the plunger chamber 6. The portion 3 is provided so as to close the valve portion 3 side opening of the plunger chamber 6.
[0045]
A lower plate 10 is provided in contact with the end face of the solenoid 2 on the valve part 3 side. The lower plate 10 has a cylindrical shape with an outward flange, the flange portion 10 b abuts on the end surface of the solenoid 2 on the valve portion 3 side, and the cylindrical portion 10 a is embedded in the inner periphery of the bobbin 9 of the solenoid 2. The inner periphery of the cylindrical portion 10a of the lower plate 10 is covered with a thin resin portion 2a.
[0046]
The bobbin 9, the thin resin portion 2a, and the cylindrical portion 11 forming the outer peripheral wall of the valve portion are integrally formed with the lower plate 10 inserted.
[0047]
Further, the end of the center post 5 on the side opposite to the valve portion 3 further protrudes from the end of the solenoid 2, and an annular upper plate 12 serving as a yoke that forms a magnetic path at the end on the side of the center post 5 opposite to the valve portion 3. The inner diameter end of is fixed.
[0048]
A connector portion 13 is interposed between the upper plate 12 and the solenoid 2. A socket portion 14 provided with terminals 14 a is connected to the connector portion 13, and lead wires (not shown) extending from the solenoid 2 are embedded in the connector portion 13.
[0049]
The solenoid 2 is accommodated in the case 15, and the outer diameter end of the upper plate 12 is fitted and fixed to the opening on the side opposite to the valve portion 3 of the case 15, and the lower plate 10 on the valve portion 3 side opening on the case 15. The outer diameter end of the flange portion 10b is fitted and fixed.
[0050]
Thereby, the magnetic circuit H when the solenoid 2 is excited is formed so as to return to the center post 5 through the center post 5, the plunger 7, the lower plate 10, the case 15, and the upper plate 12.
[0051]
Further, the case 15 is provided with a mounting plate 16, and the solenoid valve 1 is fixed at a predetermined position by the mounting plate 16.
[0052]
The center post 5 is provided with a through hole 51 that penetrates in the axial direction and communicates with the drain port DP, and a support member 17 that supports the spring by adjusting the set load of the spring 8 is fixed to the through hole 51. . One end of the spring 8 is engaged with the end of the support member 17 facing the plunger chamber 6.
[0053]
The end face of the center post 5 facing the plunger chamber 6 is a tapered surface that gradually protrudes toward the plunger chamber 6 from the inner diameter end toward the outer diameter end, and the cylindrical portion 10a of the lower plate 10 that forms a magnetic path. It is opposed to the tip with a predetermined interval in the axial direction. A stopper 18 is disposed on the end face so as to be in close contact with the plunger 7 when the plunger 7 is attracted to the center post 5.
[0054]
The plunger 7 is smaller than the inner diameter of the solenoid 2 and has a large diameter portion 71 having a predetermined annular gap between the inner periphery of the solenoid 2 and a valve sleeve of the valve portion 3 extending from the valve portion 3 side end of the large diameter portion 71. The small-diameter portion 72 abuts the end face on the 20 end portion.
[0055]
A concave portion 73 is formed on the end surface of the large diameter portion 71 of the plunger 7 on the side opposite to the valve portion 3, and the other end of the spring 8 is fitted into the concave portion 73 and positioned. A concave portion 74 is also formed on the end surface of the small diameter portion 72 on the valve portion 3 side, and the spool valve 19 of the valve portion 3 is press-fitted into the concave portion 74.
[0056]
There is a gap between the outer periphery of the plunger 7 and the inner wall surface of the plunger chamber 6 so that the fluid can move in the axial direction.
[0057]
The valve portion 3 includes a spool valve 19 that is press-fitted into the concave portion 74 of the small-diameter portion 72 of the plunger 7, a valve sleeve 20 that slides on the outer periphery of the spool valve 19, and a cylindrical portion 11 that forms an outer peripheral wall. Yes.
[0058]
The valve sleeve 20 is fixed to the inner periphery of the cylindrical portion 11 and has a cylindrical shape with a uniform inner diameter.
[0059]
On the outer periphery of the cylindrical portion 11, an O-ring 21 is mounted for exhibiting hermeticity when the cylindrical portion 11 is fitted into an attachment hole or the like.
[0060]
The inside of the spool valve 19 penetrates in the axial direction and serves as a supply pressure port SP. Then, the fluid of the solenoid supply pressure S of the solenoid supply pressure oil passage 503 flows into the solenoid valve 1 from the supply pressure port SP.
[0061]
A pilot pressure port PP is provided at the base of the valve portion 3. The pilot pressure P controlled by the solenoid valve 1 is guided from the pilot pressure port PP to the pilot pressure oil passage 504.
[0062]
The pilot pressure port PP communicates with the drain port DP via the plunger chamber 6 and the through hole 51 of the center post 5 when the valve is closed, and communicates with the supply pressure port SP when the valve is opened.
[0063]
Here, the spool valve 19 will be described in more detail with reference to FIGS.
[0064]
The spool valve 19 includes an opening 19a through which fluid flows to the pilot pressure port PP, an annular groove 19b in which the entire outer peripheral surface around the opening 19a is non-slidable with the inner peripheral surface of the valve sleeve 20, and an opening 19a. Also, a split groove 19c that divides the sliding portion formed by the sliding surfaces of the spool valve 19 outer periphery and the valve sleeve 20 inner periphery on the solenoid supply pressure oil passage 503 side into two in the axial direction, and the split groove 19c are provided. A hole portion 19d as a passage penetrating the inner periphery of the spool valve 19 is provided.
[0065]
When the valve is opened, that is, when the plunger 7 is attracted to the center post 5, the opening 19 a is separated from the inner peripheral surface of the valve sleeve 20 and connects the supply pressure port SP and the pilot pressure port PP.
[0066]
The annular groove 19b prevents the edge of the opening 19a from coming into contact with the edge of the end of the valve sleeve 20, and has a smaller diameter than the outer diameter of the sliding portion over the entire circumference. The groove side surface of the annular groove is provided perpendicular to the axial direction.
[0067]
Similarly to the annular groove 19b, the division groove 19c is an annular shape provided around the entire circumference, and a portion where the division groove 19c is provided has a gap between the inner peripheral surface of the valve sleeve 20 and thereby the spool valve 19 is provided. Two sliding portions whose outer periphery slides on the inner periphery of the valve sleeve 20 are provided. Here, the sliding portion at the tip of the spool valve 19 is referred to as a first sliding portion 19e, and the sliding portion on the plunger 7 side is referred to as a second sliding portion 19f.
[0068]
The hole portion 19d is provided so that a gap between the dividing groove 19c and the inner peripheral surface of the valve sleeve 20 communicates with the inside of the spool valve 19 so that the gap becomes equal to the supply pressure S inside the spool valve 19. ing.
[0069]
Further, as shown in FIG. 2, the spool valve 19 is separate from the plunger 7, and the spool valve 19 is press-fitted into the concave portion 74 of the end surface of the small diameter portion 72 of the plunger 7, and as shown in FIG. 7 is integrated.
[0070]
In the solenoid valve 1 of the present embodiment, the solenoid 2 is excited and the plunger 7 is attracted to the center post 5 against the spring force of the spring 8, so that the opening 19 a of the spool valve 19 is opened to the valve sleeve. 20 The valve is opened away from the inner peripheral surface, and the supply pressure port SP and the pilot pressure port PP communicate with each other. At this time, the plunger 7 is in close contact with the stopper 18 disposed on the center post 5 to block the drain port DP.
[0071]
On the other hand, when the solenoid 2 is not energized, the plunger 7 is pressed against the valve portion 3 by the spring force of the spring 8, so that the spool valve 19 is located in the valve sleeve 20 and is closed, and the supply pressure port SP is shut off. The pilot pressure port PP and the drain port DP communicate with each other through the through hole 51 of the center post 5 and the plunger chamber 6.
[0072]
Here, in the solenoid valve 1 of the present embodiment, at the time of manufacture, as shown in FIG. 4, the plunger 7 and the spool valve 19 are in a stage after the caulking of the case 15 and before the spring 8 and the support member 17 are assembled. The effective valve stroke is adjusted by changing the total axial length of the solenoid valve 1 to make the control characteristics of the solenoid valve 1 appropriate.
[0073]
Here, the effective valve stroke refers to a difference from a position where the spool valve 19 starts to open to a position where the spool valve 19 reaches the maximum opening.
[0074]
As described above, since the plunger 7 and the spool valve 19 are integrated by press-fitting, the total length integrated with the plunger 7 is changed by adjusting the press-fitting amount of the spool valve 19 with respect to the plunger 7. Thus, the valve stroke is adjusted to make the control characteristics appropriate.
[0075]
In order to enable the adjustment of the press-fitting amount, the solenoid valve 1 has both axial direction sides of the supply pressure port SP side and the drain port DP side with respect to the plunger 7 and the spool valve 19 before the spring 8 and the support member 17 are assembled. It will be in the state opened to the outside.
[0076]
Then, as shown in FIG. 4, the jig 401 is inserted from both sides of the opened axial direction, and the concave portion 73 of the plunger 7 and the end portion on the supply pressure port SP side of the spool valve 19 are pressed by the jig 401 to press-fit. The spool valve 19 is press-fitted into the plunger 7 while adjusting the amount.
[0077]
In this adjustment, not only the total length of the plunger 7 and the spool valve 19 but also the position of the opening 19a of the spool valve 19 can be adjusted.
[0078]
Then, after making the control characteristics of the solenoid valve 1 appropriate, the spring 8 is inserted through the through hole 51 of the center post 5 and the support member 17 is fixed in the through hole 51 to complete the solenoid valve 1. I am letting.
[0079]
Therefore, in the present embodiment, the plunger 7 and the spool valve 19 are provided separately, and the effective valve stroke is adjusted by adjusting the press-fitting amount when the spool valve 19 is press-fitted into the plunger 7. Since the control characteristics are made appropriate, the finished product can be obtained without being influenced by the spring 8 and the support member 17 incorporated thereafter, and the solenoid valve 1 having appropriate control characteristics and good quality can be obtained. .
[0080]
Further, since adjustment is possible with a simple configuration in which the plunger 7 and the spool valve 19 are separated, there is no need to screw in or press-fit the center post 5 as in the prior art, and the cost is lower than in the prior art. You can plan.
[0081]
On the other hand, as shown in FIG. 2, the spool valve 19 is provided with an annular groove 19b on the outer peripheral surface of the spool valve 19 around the opening 19a, so that the edge of the opening 19a is the valve sleeve 20 in the valve open state. It is possible to prevent point contact by coming into contact with the edge of the end portion.
[0082]
In particular, the annular groove 19b is provided on the entire circumference, and the groove side surface of the annular groove 19b is perpendicular to the axial direction. Therefore, even when the spool valve 19 is tilted, the edge of this groove side surface is the end of the valve sleeve 20. As a result, the durability of the solenoid valve 1 can be extended and the life of the solenoid valve 1 can be extended.
[0083]
Further, since the annular groove 19b has a gap around the opening 19a of the spool valve 19 with respect to the inner peripheral surface of the valve sleeve 20, a minute burr is generated around the opening 19a when the opening 19a is processed. However, the sliding of the spool valve 19 with respect to the valve sleeve 20 is not affected.
[0084]
In addition to the present embodiment, the annular groove 19b can be variously modified such as being provided on the valve sleeve 20 side as shown in FIG. FIG. 6 shows an example in which the spool valve 19 is integrated with the plunger 7 (here, it will be described as a spool valve 19 having a plunger portion and a spool valve portion). In particular, only the annular groove 19b is taken up.
[0085]
6 (a) and 6 (b), the spool valve portion is provided with an annular groove 19b as in the present embodiment. In particular, in FIG. 6B, the side surface of the annular groove 19b opposite to the valve portion 3 is the end surface of the plunger portion. When the spool valve 19 is closed, the end surface of the plunger portion abuts the end surface of the valve sleeve.
[0086]
In FIG. 6C, an annular groove 19a is provided on the valve sleeve 20 side, and the same effect can be obtained by this.
[0087]
In addition, the spool valve 19 is provided with a dividing groove 19c, and the sliding portion has two positions in the axial direction (first and second sliding portions 19e and 19f), but both ends of the two sliding portions 19e and 19f. Therefore, the spool valve 19 is prevented from being tilted, so that it is possible to prevent the spool valve 19 from hitting one piece.
[0088]
The sliding resistance generated when foreign matter (contamination) contained in the fluid enters the clearance between the sliding portions 19e, 19f and the sliding surfaces on the inner periphery of the valve sleeve by the dividing groove 19c is divided as shown in FIG. Since the groove 19c is provided and the sliding portion itself is shortened, it is reduced and the control characteristics are stabilized. Even when a control failure occurs, the sliding parts 19e and 19f are short, so that the foreign matter is removed from the clearance part at an early stage, so that the time until return is short (the arrow in FIG. 7 indicates the flow of the foreign substance I).
[0089]
Further, since the two sliding portions 19e and 19f divided by the dividing groove 19c are provided with the same outer diameter, centerless machining is possible, the machining is easy, and the outer diameter can be created with high accuracy. Further, the movement of the spool valve 19 is stabilized, the control of the solenoid valve 1 is stabilized, and the two parts can be processed simultaneously as compared with the one having two sliding parts having different diameters, and the cost can be reduced.
[0090]
For example, as shown in FIG. 8B, various modifications can be made such as providing the dividing groove 19c on the valve sleeve 20 side, or providing a plurality of sliding portions at three or more locations. FIG. 8 shows a model in which only the dividing groove 19c is taken up as in FIG.
[0091]
Further, a hole portion 19d penetrating the inner and outer periphery is provided at the portion where the dividing groove 19c is provided, and the gap between the dividing groove 19c and the inner peripheral surface of the valve sleeve 20 communicates with the inside of the spool valve 19, so that the gap is spooled Since the pressure is equal to the supply pressure S inside the valve 19, it is difficult for foreign matter to enter the first sliding portion 19e.
[0092]
Further, since the fluid pressure is lower in the vicinity of the plunger 7 that has passed through the opening 19a of the spool valve 19, the foreign matter that has entered the gap between the dividing groove 19c and the inner peripheral surface of the valve sleeve 20 becomes the second sliding portion 19f. Between the valve sleeve 20 and the inner peripheral surface of the valve sleeve 20 (see FIG. 9, arrows indicate the flow of the foreign matter I).
[0093]
In this embodiment, the hole 19d that penetrates the inner periphery of the spool valve 19 is provided as a passage. However, as shown in FIG. 10B, the hole 19d is provided inside the valve portion 3 and goes outside the supply pressure port SP. Various modifications such as providing the passage 20a are possible. FIG. 10 is a model in which only the passage that makes the gap formed by the dividing groove 19c between the outer peripheral surface of the spool valve 19 and the inner peripheral surface of the valve sleeve 20 equal to the supply pressure is taken up as in FIGS. .
[0094]
【The invention's effect】
As described above, in the present invention, the center post has a through hole penetrating in the axial direction, the plunger and the spool valve are provided separately, and the inside of the valve sleeve and the through hole of the center post are provided. The solenoid valve is adjusted by press-fitting the spool valve to the plunger with jigs inserted from both sides in the axial direction, and adjusting the effective valve stroke by adjusting the axial length of the plunger and spool valve according to the amount of press-fitting. Since the control characteristics are appropriate, and the subsequent incorporation of the parts does not affect the control characteristics, it is possible to obtain a finished solenoid valve with appropriate control characteristics and good quality.
[0095]
Further, since adjustment is possible with a simple configuration in which the plunger and the spool valve are separated, the cost can be reduced as compared with the prior art.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a solenoid valve according to an embodiment.
FIG. 2 is a cross-sectional view and a top view showing a spool valve and a plunger according to an embodiment.
FIGS. 3A and 3B are a cross-sectional view and a top view showing a state where the spool valve and the plunger according to the embodiment are integrated. FIGS.
FIG. 4 is a cross-sectional view showing a state of an effective valve stroke adjustment of the solenoid valve according to the embodiment.
FIG. 5 shows a hydraulic control system to which a solenoid valve is applied.
FIG. 6 is a model diagram showing another example of the annular groove of the present invention.
FIG. 7 is an explanatory view showing the operation of the dividing groove of the present invention.
FIG. 8 is a model diagram showing another example of the annular groove of the present invention.
FIG. 9 is an explanatory view showing the operation of the hole of the present invention.
FIG. 10 is a model diagram showing another example of the passage of the present invention.
FIG. 11 is a longitudinal sectional view showing a conventional solenoid valve.
FIG. 12 is a diagram showing a point contact state between a spool valve and a valve sleeve.
FIG. 13 is an explanatory diagram showing a state in which foreign matter has entered the clearance portion.
FIG. 14 is a view showing a spool valve provided with two sliding portions.
[Explanation of symbols]
1 Solenoid valve
2 Solenoid
3 Valve section
4 Coils
5 Center post
51 Through hole
6 Plunger chamber
7 Plunger
8 Spring
9 Bobbin
10 Lower plate
10a Cylindrical part
10b Flange part
11 Tube
12 Upper plate
13 Connector section
14 Socket part
14a terminal
15 cases
16 Mounting plate
17 Support member
18 Stopper
19 Spool valve
19a opening
19b annular groove
19c Dividing groove
19d hole
19e 1st sliding part
19f 2nd sliding part
20 Valve sleeve
21 O-ring
SP supply pressure port
PP pilot pressure port
DP drain port

Claims (2)

A center post fixed inside the solenoid;
A plunger provided opposite to the center post and movable in the axial direction;
A spool valve interlocked with the plunger;
In a solenoid valve provided with a valve sleeve that slides on the outer peripheral surface of the spool valve,
The center post has a through hole penetrating in the axial direction,
The plunger and the spool valve are provided separately,
The spool valve is press-fitted into the plunger by a jig inserted from the inside of the valve sleeve and from both axial sides through the through hole of the center post, and the axial length of the plunger and the spool valve is The solenoid valve is characterized in that the effective valve stroke is adjusted by adjusting the pressure according to the press-fitting amount.   A center post fixedly disposed inside the solenoid and having a through-hole penetrating in the axial direction;
  A plunger provided facing the center post and movable in the axial direction;
  A spool valve provided separately from the plunger and interlocked with the plunger;
  In a method of manufacturing a solenoid valve comprising a valve sleeve that slides on the outer peripheral surface of the spool valve,
  The spool valve is press-fitted into the plunger by a jig inserted from the inside of the valve sleeve and from both sides in the axial direction through the through hole of the center post, and the axial length of the plunger and the spool valve. A method for manufacturing a solenoid valve, comprising adjusting the effective valve stroke by adjusting the pressure according to the press-fitting amount.

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