JP2013160354A - Solenoid valve and tandem type solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent air from infiltrating into a spring storage chamber of a linear solenoid valve, with a small, simple structure.SOLUTION: A solenoid 14 and a spring 16 are respectively connected to both ends of a spool 13 fitted to a sleeve 12, and an oil reservoir 17 partitioned between the outer peripheral surface of the sleeve 12 and the inner peripheral surface of a sleeve support hole 11a of a valve body 11 communicates with a spring storage chamber 15 through an orifice 12f and also communicates with an atmosphere open port P1 at the upper part of the sleeve 12. The spring storage chamber 15 can thereby be filled with oil leaking from a pressure port P5, and oil in the oil reservoir 17 can be prevented from falling out of the atmosphere open port P1 under gravity. Air is thereby prevented from infiltrating into the spring storage chamber 15 from the oil reservoir 17. Moreover, since there is no need to separately constitute a large-sized oil reservoir with a high oil level, the valve body 11 can be miniaturized.

Description

  The present invention is connected to a sleeve in which a pressure port and an air release port are formed by fitting into a sleeve support hole of a valve body, a spool slidably fitted to the sleeve, and one end of the spool. A solenoid valve including a solenoid, a spring storage chamber formed on the other end of the spool, a spring stored in the spring storage chamber and biasing the spool toward the solenoid; The present invention relates to a combined tandem solenoid valve.

  With a linear solenoid valve that drives a spool with a linear solenoid, the spool may vibrate in the axial direction due to fluctuations in the oil pressure or current in the linear solenoid. is there.

  Therefore, when the spring storage chamber that stores the spring that biases the spool toward the linear solenoid is connected to the oil reservoir via the orifice, and the spool vibrates and the volume of the spring storage chamber increases or decreases, the spring storage chamber Japanese Patent Application Laid-Open Publication No. 2004-228561 discloses that oil in an oil reservoir is moved back and forth through an orifice and the vibration of the spool is suppressed by a damping force generated at that time.

JP 2002-130513 A

  By the way, what was described in the said patent document 1 forms a special oil sump in the inside of a valve body, and sets the oil level of an oil sump in the position higher than a linear solenoid valve, and it is air in a spring storage chamber. In this way, a large oil sump is required, which not only increases the size of the valve body, but also installs a linear solenoid valve in relation to the oil level of the oil sump. There is a problem that the position is restricted.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent air from entering the spring storage chamber of a linear solenoid valve with a small and simple structure.

  To achieve the above object, according to the first aspect of the present invention, there is provided a sleeve that is fitted into a sleeve support hole of a valve body to form a pressure port and an air release port, and is slidable on the sleeve. A spool that fits to one end of the spool, a solenoid connected to one end of the spool, a spring storage chamber formed on the other end of the spool, and the spool stored in the spring storage chamber toward the solenoid A solenoid valve having an urging spring, wherein the pressure port is disposed adjacent to the spring housing chamber, and an oil reservoir is defined between an outer peripheral surface of the sleeve and an inner peripheral surface of the sleeve support hole; The reservoir communicates with the spring storage chamber through an orifice and communicates with the atmosphere release port at the upper portion of the sleeve. Solenoid valve is proposed which is characterized in that the.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the sleeve support hole has an opening and is formed into a bag shape, and the sleeve is formed from the opening to the sleeve support hole. A solenoid valve is proposed, characterized in that is inserted.

  According to the invention described in claim 3, in addition to the configuration of claim 1 or claim 3, the volume of the oil sump is larger than the volume change amount of the spring storage chamber accompanying the movement of the spool. A solenoid valve is proposed.

  According to the invention described in claim 4, the first and second sleeves, which are fitted in the sleeve support holes of the valve body and are respectively formed with a pressure port and an air release port, and the first and second sleeves, respectively. First and second spools slidably fitted to the sleeve, first and second solenoids respectively connected to one end sides of the first and second spools, and the first and second spools The first and second spring storage chambers formed on the end sides, respectively, and the first and second spring storage chambers, respectively, and the first and second spools are directed toward the first and second solenoids, respectively. In a tandem solenoid valve having first and second springs for biasing, the pressure port is disposed adjacent to only one of the first and second spring storage chambers, A single oil sump is defined between one outer peripheral surface and the inner peripheral surface of the sleeve support hole, and the oil sump is passed through the first and second orifices to the first and second spring storage chambers, respectively. There is proposed a tandem type solenoid valve that communicates with at least one of the first and second sleeves and communicates with the atmosphere release port.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the sleeve support hole has two openings and penetrates the valve body, and A tandem solenoid valve is proposed in which the first and second sleeves are inserted.

  According to a sixth aspect of the invention, in addition to the configuration of the fourth or fifth aspect, the volume of the oil sump is changed in volume of the first spring storage chamber as the first spool moves. A tandem solenoid valve is proposed which is larger than the sum of the amount and the volume change amount of the second spring storage chamber accompanying the movement of the second spool.

  The linear solenoids 14 and 14 'of the embodiment correspond to the solenoid of the present invention, the damping orifices 12f and 12f' of the embodiment correspond to the orifice of the present invention, and the feedback ports P5 and P5 'of the embodiment. Corresponds to the pressure port of the present invention.

  According to the configuration of claim 1, the solenoid and the spring are respectively connected to both ends of the spool slidably fitted to the sleeve, and the oil is partitioned between the outer peripheral surface of the sleeve and the inner peripheral surface of the sleeve support hole of the valve body. Since the reservoir communicated with the spring accommodating chamber via the orifice and communicated with the atmosphere release port at the upper portion of the sleeve, the spring accommodating chamber can be filled with oil leaked from the pressure port. Therefore, when the volume of the spring storage chamber increases or decreases due to the vibration of the spool, the vibration of the spool can be suppressed by the oil in the spring storage chamber and the oil reservoir going back and forth through the orifice. Since the oil sump communicates with the air release port at the upper part of the sleeve, it is possible to prevent oil in the oil sump from dropping out of the air release port due to gravity, and to prevent air from entering the spring storage chamber from the oil sump. . In addition, since it is not necessary to separately configure a large oil reservoir having a high oil level, the valve body can be reduced in size.

  According to the second aspect of the present invention, since the sleeve support hole has an opening and is formed into a bag shape, the inner peripheral surface of the sleeve support hole and An oil sump can be formed between the outer peripheral surfaces of the sleeve.

  According to the third aspect of the present invention, since the volume of the oil reservoir is larger than the volume change amount of the spring storage chamber accompanying the movement of the spool, the maximum amount of oil is pushed out from the spring storage chamber to the oil reservoir. Even if the oil overflows, it is possible to leave more oil than the maximum amount in the oil reservoir, and when the oil is returned to the spring storage chamber, the spring storage chamber is filled with oil and air enters. Can be prevented.

  According to the fourth aspect of the present invention, the first and second solenoids and the first and second springs are respectively connected to both ends of the first and second spools slidably fitted to the first and second sleeves, respectively. A single oil sump defined between at least one outer peripheral surface of the first and second sleeves and an inner peripheral surface of the sleeve support hole is stored in the first and second springs via the first and second orifices, respectively. And communicated with the atmosphere release port at the top of at least one of the first and second sleeves, so that one of the first and second spring storage chambers adjacent to the pressure port can be filled with oil, This oil flows into the other of the first and second spring storage chambers through the oil reservoir, so that both the first and second spring storage chambers can be filled with oil. Therefore, when the volumes of the first and second spring storage chambers increase or decrease due to vibrations of the first and second spools, the oil in the first and second spring storage chambers and the oil reservoirs passes through the first and second orifices. By going back and forth, vibrations of the first and second spools can be suppressed. Since the oil sump communicates with the atmosphere release port at the upper part of at least one of the first and second sleeves, oil in the oil sump is prevented from falling off from the atmosphere release port due to gravity, and the first and second springs are stored from the oil sump. Air can be prevented from entering the chamber. In addition, since it is not necessary to separately configure a large oil reservoir having a high oil level, the valve body can be reduced in size.

  According to the fifth aspect of the present invention, since the sleeve support hole has two openings and penetrates the valve body, the first and second sleeves are respectively inserted into the sleeve support holes from the two openings. Only by this, an oil sump can be formed between the inner peripheral surface of the sleeve support hole and the outer peripheral surface of the sleeve.

  According to the sixth aspect of the present invention, the volume of the oil sump is determined by the volume change amount of the first spring storage chamber accompanying the movement of the first spool and the volume change amount of the second spring storage chamber accompanying the movement of the second spool. Since the maximum amount of oil is pushed out from both the first and second spring storage chambers into the oil sump and overflows from the oil sump, the amount of oil larger than the maximum amount of oil is exceeded. When the oil is returned to the first and second spring storage chambers, the first and second spring storage chambers can be filled with oil to prevent air from entering.

The figure which shows the structure of a linear solenoid valve (valve closed state). [First Embodiment] Action explanatory drawing (valve open state) corresponding to FIG. [First Embodiment] The figure which shows the structure of a linear solenoid valve (valve closed state). [Second Embodiment] The figure which shows the structure of a tandem type linear solenoid valve. [Third Embodiment]

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. 1 and FIG.

  As shown in FIG. 1, for example, a normally closed linear solenoid valve V used in a hydraulic control device for an automobile transmission includes a valve body 11 having a bag-like sleeve support hole 11a and a sleeve of the valve body 11. A bottomed cylindrical sleeve 12 fitted in the support hole 11a, a spool 13 fitted in the sleeve 12 so as to be axially slidable, and a linear solenoid 14 connected to one end of the spool 13; The linear solenoid 14 is disposed outside the valve body 11.

  An air release port P1, a discharge port P2, an output port P3, an input port P4, and a feedback port P5 are formed on the sleeve 12 from one end side (left end side in the figure) to the other end side (right end side in the figure). The atmosphere release port P1, the discharge port P2, the output port P3, and the input port P4 are connected to the atmosphere release oil passage H1, the discharge oil passage H2, the output oil passage H3, and the input oil passage H4, respectively. The air release oil path H1 is opened to the atmosphere, the discharge oil path H2 is connected to an oil tank, the output oil path H3 is connected to hydraulic equipment such as a hydraulic clutch, and the input oil path is connected to an oil pump. The feedback port P5 communicates with the output port P3 by a feedback orifice 12a penetrating the sleeve 12 in the radial direction and a first oil groove 12b formed on the outer peripheral surface of the sleeve 12 in the axial direction.

  The spool 13 is formed with a first groove G1, a first land L1, a second groove G2, a second land L2, and a third land L3 from one end side to the other end side, and has a cylindrical shape with a bottom. A spring accommodating chamber 15 is defined between the bottom wall 12 c of the sleeve 12 and the other end of the spool 13. The spring 16 stored in the spring storage chamber 15 urges the spool 13 toward the linear solenoid 14. The atmosphere release port P1 and the feedback port P5 are always open, but communication / blocking between the discharge port P2, the output port P3, and the input port P4 is controlled according to the position of the spool 13.

  An oil reservoir 17 is formed between the inner peripheral surface of the sleeve support hole 11 a and the outer peripheral surface of the sleeve 12. That is, a second oil groove 12d extending in the axial direction is formed in the upper part of the outer peripheral surface of the sleeve 12, and a space formed between the second oil groove 12d and the inner peripheral surface of the sleeve support hole 11a, The space formed between the bottom portion 11 b of the sleeve support hole 11 a and the bottom wall 12 c of the sleeve 12 communicates with each other, and these two spaces constitute the oil reservoir 17. One end of the oil reservoir 17 communicates with the atmosphere release port P1 through the oil hole 12e, and the other end of the oil reservoir 17 communicates with the spring storage chamber 15 through the damping orifice 12f.

  Next, the operation of the first embodiment of the present invention having the above configuration will be described.

  As shown in FIG. 1, when the linear solenoid 14 of the normally closed linear solenoid valve V is demagnetized, the spool 13 is moved to the left by the elastic force of the spring 16 to close the linear solenoid valve V, and the second land. The communication between the input port P4 and the output port P3 is cut off via L2, and the output port P3 and the discharge port P2 are connected via the second groove G2. As a result, the output oil passage H3 connected to the hydraulic equipment is disconnected from the input oil passage H4 connected to the oil pump and connected to the discharge oil passage H2 connected to the oil tank, and the operation of the hydraulic equipment is stopped. At this time, since the output port P3 is at atmospheric pressure, the feedback port P5 communicating with the output port P3 via the first oil groove 12b and the feedback orifice 12a is also at atmospheric pressure.

  When the linear solenoid 14 is excited from this state, the spool 13 is moved to the right while compressing the spring 16 as shown in FIG. 2 to open the linear solenoid valve V, and the output port P3 and the output port P3 are connected via the second groove G2. The input port P4 communicates with the output port P3 and the discharge port P2 through the first land L1. As a result, the output oil passage H3 connected to the hydraulic device is disconnected from the discharge oil passage H2 connected to the oil tank and connected to the input oil passage H4 connected to the oil pump, so that the hydraulic device operates.

  At this time, the hydraulic pressure of the output port P3 is transmitted to the feedback port P5 via the first oil groove 12b and the feedback orifice 12a, and the hydraulic pressure urges the step portions of the second land L2 and the third land L3 to the left. The spool 13 stops at a position where the sum of the rightward thrust generated by the linear solenoid 14 and the leftward elastic force of the spring 16 and the leftward hydraulic pressure generated at the feedback port P5 is supplied to the linear solenoid 14. The hydraulic pressure corresponding to the current value to be output can be output from the output port P3.

  When the linear solenoid valve V is in the open state, the feedback port P5 becomes high pressure, so that oil leaked from the feedback port P5 through the annular gap α between the outer peripheral surface of the third land L3 and the inner peripheral surface of the sleeve 12 Is supplied to the spring storage chamber 15 adjacent thereto. The oil supplied to the inside of the spring storage chamber 15 passes through the damping orifice 12f, fills the oil reservoir 17, and is discharged through the oil hole 12e formed in the oil reservoir 17 and the air release port P1. Since the oil hole 12e is provided at the highest position of the oil reservoir 17, the oil in the oil reservoir 17 is held without falling off due to gravity.

  Therefore, when the spool 13 vibrates in the axial direction due to fluctuations in the pressure of the oil flowing through the linear solenoid valve V, fluctuations in the current of the linear solenoid 14, etc., the oil in the spring storage chamber 15 passes through the damping orifice 12f. The vibration of the spool 13 can be suppressed by the damping force generated when the oil moves back and forth between the oil reservoirs 17 and passes through the damping orifice 12f.

  When the linear solenoid valve V shifts from the closed state to the open state and the spool 13 moves to the right, the volume of the spring storage chamber 15 is reduced according to the stroke of the spool 13, and oil equal to the reduced volume is supplied to the damping orifice 12f. The oil is discharged from the oil hole 12e to the air release port P1. Thereafter, when the linear solenoid valve V is closed and the spool 13 is moved to the left to the original position and the volume of the spring storage chamber 15 is increased, the oil remaining in the oil reservoir 17 passes through the damping orifice 12f and is stored in the spring. Since the air is returned to the chamber 15, air can be prevented from entering the spring storage chamber 15. At this time, the oil in the oil reservoir 17 is reduced by the amount returned to the spring storage chamber 15, but is quickly replenished by the oil replenished from the feedback port P5 through the spring storage chamber 15.

  If the volume of the oil reservoir 17 is smaller than the reduction of the volume of the spring storage chamber 15, the oil in the oil reservoir 17 is completely emptied when the spring storage chamber 15 expands after the volume reduction. Then, air may enter the spring storage chamber 15 from the oil reservoir 17 through the damping orifice 12f, and vibration of the spool 13 may not be suppressed. However, according to the present embodiment, since the volume of the oil reservoir 17 is set larger than the reduction of the volume of the spring storage chamber 15, the oil in the oil reservoir 17 is increased when the volume of the spring storage chamber 15 is increased. Is not emptied, and air can be reliably prevented from entering the spring storage chamber 15.

  As described above, according to the present embodiment, since the spring storage chamber 15 is provided adjacent to the feedback port P5 that is a pressure port, the spool 13 can be moved from the feedback port P5 without forming a special oil passage. The spring storage chamber 15 can be filled with oil leaking through the outer peripheral surface. Further, since the oil reservoir 17 communicating with the spring storage chamber 15 via the damping orifice 12f is formed between the bag-like sleeve support hole 11a of the valve body 11 and the outer peripheral surface of the sleeve 12, the oil reservoir 17 is formed from the opening of the sleeve support hole 11a. The oil sump 17 can be configured simply by inserting the sleeve 12, and the structure can be simplified and the assemblability can be improved.

  Further, since the oil hole 12e that communicates the oil reservoir 17 with the atmosphere opening port P1 is provided at the highest position of the oil reservoir 17, it is possible to prevent the oil in the oil reservoir 17 from falling out to the atmosphere opening port P1 due to gravity. Further, since the volume of the oil reservoir 17 is set to be larger than the reduction of the volume of the spring storage chamber 15, the oil in the oil reservoir 17 is not emptied when the volume of the spring storage chamber 15 is increased, and the spring storage chamber. Intrusion of air into 15 can be reliably prevented. Moreover, since it is not necessary to separately configure a large oil reservoir having a high oil level, the valve body 11 can be reduced in size, and the positional relationship between the oil surface of the separately configured oil reservoir and the linear solenoid valve V is considered. There is no need.

Second embodiment

  Next, a second embodiment of the present invention will be described with reference to FIG.

  The first embodiment is configured by a second oil groove 12d in which a part of the oil reservoir 17 is formed on the outer peripheral surface of the sleeve 12. However, in the second embodiment, the second oil groove 12d A corresponding third oil groove 12 g is formed on the inner peripheral surface of the sleeve support hole 11 a of the valve body 1. Also according to the second embodiment, it is possible to achieve the same function and effect as those of the first embodiment described above.

Third embodiment

  Next, a third embodiment of the present invention will be described with reference to FIG.

  The first embodiment or the second embodiment relates to a normally closed linear solenoid valve V (hereinafter referred to as a first linear solenoid valve V). The present invention relates to a tandem linear solenoid valve in which a closed linear solenoid valve V is combined with a normally open linear solenoid valve V ′ (hereinafter referred to as a second linear solenoid valve V ′).

  The structure of the second linear solenoid valve V ′ is similar to the structure of the first linear solenoid valve V (substantially the same as the linear solenoid valve V of the first embodiment), and the arrangement of the spool lands and grooves Only the arrangement of the port of the sleeve is different. The reference numerals of the constituent elements of the second linear solenoid valve V ′ are obtained by adding “′” to the reference numerals of the constituent elements of the corresponding first linear solenoid valve V ′.

  A sleeve support hole 11a is formed in the valve body 11 with openings at both ends, and the sleeve 12 of the first linear solenoid valve V is inserted from one opening, and the second opening from the other opening. The sleeve 12 'of the linear solenoid valve V' is inserted.

  The sleeve 12 ′ of the second linear solenoid valve V ′ has an air release port P 1 ′, a feedback port P 5 ′, an input port P 4 ′, an output from one end side (right end side) to the other end side (left end side). A port P3 'and a discharge port P2' are formed. The atmosphere release port P1 ', the input port P4', the output port P3 'and the discharge port P2' are respectively connected to the atmosphere release oil passage H1 ', the input oil passage H4', The output oil passage H3 ′ and the discharge oil passage H2 ′ are connected. A first groove G1 ′, a first land L1 ′, a second land L2 ′, a second groove G2 ′, and a third land L3 ′ are formed on the spool 13 ′ from one end side to the other end side. .

  A second oil groove 12d 'extending in the axial direction is formed in the upper part of the outer peripheral surface of the sleeve 12', and a space formed between the second oil groove 12d 'and the inner peripheral surface of the sleeve support hole 11a. The oil reservoir 17 is partitioned by the space formed between the sleeve 12 and the facing portion of the sleeve 12 '. The oil reservoir 17 communicates with the atmosphere release port P1 ′ via the oil hole 12e ′ and communicates with the spring accommodating chamber 15 ′ via the damping orifice 12f ′. Note that the spring accommodating chamber 15 of the first linear solenoid valve V communicates with the same oil reservoir 17 via the damping orifice 12f.

  Next, the operation of the third embodiment of the present invention having the above configuration will be described.

  As shown in FIG. 4, when the linear solenoid 14 'of the normally open second linear solenoid valve V' is demagnetized, the spool 13 'is moved to the right by the elastic force of the spring 16', and the second linear solenoid valve V '. Is opened, the output port P3 'and the input port P4' communicate with each other through the second groove G2 ', and the communication between the output port P3' and the discharge port P2 'is blocked through the third land L3'. . As a result, the output oil passage H3 ′ connected to the hydraulic equipment is cut off from the discharge oil passage H2 ′ connected to the oil tank and connected to the input oil passage H4 ′ connected to the oil pump, and the hydraulic equipment operates. At this time, since the output port P3 ′ communicating with the input port P4 ′ is at a high pressure, the feedback port P5 ′ communicating therewith via the first oil groove 12b ′ and the feedback orifice 12a ′ also has a high pressure.

  When the linear solenoid 14 'is excited from this state, the spool 13' moves to the left while compressing the spring 16 ', the second linear solenoid valve V' is closed, and the output port P3 is connected via the second groove G2 '. 'And the discharge port P2' communicate with each other, and the communication between the output port P3 'and the input port P4' is cut off via the second land L2 '. As a result, the output oil passage H3 ′ connected to the hydraulic equipment is disconnected from the input oil passage H4 ′ connected to the oil pump and connected to the discharge oil passage H2 ′ connected to the oil tank, and the operation of the hydraulic equipment is stopped.

  At this time, the hydraulic pressure at the output port P3 ′ gradually decreases, and is transmitted from the output port P3 ′ to the feedback port P5 ′ via the first oil groove 12b ′ and the feedback orifice 12a ′, and the first land L1 ′ and Since the hydraulic pressure for urging the step portion of the second land L2 'to the left gradually decreases, the sum of the leftward thrust generated by the linear solenoid 14 and the leftward hydraulic pressure generated at the feedback port P5' and the rightward direction of the spring 16 ' When the spool 13 'is stopped at a position where it is balanced with the elastic force, the hydraulic pressure corresponding to the current value supplied to the linear solenoid 14' can be supplied from the output port P3 '.

  By the way, the normally open type second linear solenoid valve V ′ is adjacent to the spring storage chamber 15 ′ with the discharge port P 2 ′ of atmospheric pressure, so that the spring storage chamber is interposed from the discharge port P 2 ′ through the outer periphery of the spool 13. Oil cannot be supplied to 15 ', and therefore oil cannot be supplied to the oil reservoir 17 from the spring storage chamber 15'. However, since the oil reservoir 17 is supplied with oil from the spring accommodating chamber 15 of the first linear solenoid valve V in the same manner as in the first embodiment, the oil reservoir 17 can hold the oil without any trouble. .

  Therefore, according to the third embodiment, in addition to the function and effect of the first embodiment, the oil reservoir 17 is shared by the first and second linear solenoid valves V and V ′, and the valve body 11 is compact. In addition, the first linear solenoid valve V ′ is normally open, and even if the oil reservoir 17 cannot be replenished with oil from the spring storage chamber 15 ′, the normally closed first Oil can be supplied to the oil reservoir 17 from the spring storage chamber 15 of the linear solenoid valve V.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the pressure port of the present invention is not limited to the feedback ports P5 and P5 ′ of the embodiment, and may be the input ports P4 and P4 ′.

11 Valve body 11a Sleeve support hole 12, 12 'Sleeve 12f, 12f' Damping orifice (orifice)
13, 13 'Spool 14, 14' Solenoid 15, 15 'Spring storage chamber 16, 16' Spring 17 Oil sump P5, P5 'Feedback port (pressure port)
P1, P1 'Air release port

Claims (6)

A sleeve (12) fitted with a sleeve support hole (11a) of the valve body (11) to form a pressure port (P5) and an air release port (P1);
A spool (13) slidably fitted to the sleeve (12);
A solenoid (14) connected to one end of the spool (13);
A spring storage chamber (15) formed on the other end of the spool (13);
A solenoid valve including a spring (16) housed in the spring housing chamber (15) and biasing the spool (13) toward the solenoid (14);
The pressure port (P5) is disposed adjacent to the spring accommodating chamber (15), and an oil reservoir (17) is defined between the outer peripheral surface of the sleeve (12) and the inner peripheral surface of the sleeve support hole (11a). The oil reservoir (17) communicates with the spring storage chamber (15) through an orifice (12f) and communicates with the air release port (P1) at the upper part of the sleeve (12). Solenoid valve to be used.   The sleeve support hole (11a) is formed in a bag shape having an opening, and the sleeve (12) is inserted into the sleeve support hole (11a) from the opening. The solenoid valve described in 1.   The solenoid according to claim 1 or 2, wherein the volume of the oil sump (17) is larger than a volume change amount of the spring storage chamber (15) accompanying the movement of the spool (13). valve. The first and second sleeves (12, 12), which are fitted into the sleeve support holes (11a) of the valve body (11) and are respectively formed with pressure ports (P5, P5 ') and atmospheric release ports (P1, P1'). 12 ')
First and second spools (13, 13 ') slidably fitted to the first and second sleeves (12, 12'), respectively;
First and second solenoids (14, 14 ') respectively connected to one end sides of the first and second spools (13, 13');
First and second spring accommodating chambers (15, 15 ') formed on the other ends of the first and second spools (13, 13'),
The first and second spools (13, 13 ') are stored in the first and second spring storage chambers (15, 15'), respectively, and are directed toward the first and second solenoids (14, 14 '). In the tandem type solenoid valve provided with first and second springs (16, 16 ') for urging each,
The pressure port (P5, P5 ') is disposed adjacent to only one of the first and second spring storage chambers (15, 15'), and at least the first and second sleeves (12, 12 ') are disposed. A single oil reservoir (17) is defined between one outer peripheral surface and the inner peripheral surface of the sleeve support hole (11a), and the oil reservoir (17) is divided into first and second orifices (12f, 12f ′), respectively. ) Communicated with the first and second spring storage chambers (15, 15 ') and at least one upper portion of the first and second sleeves (12, 12'). A tandem solenoid valve characterized in that it communicates with ′).   The sleeve support hole (11a) has two openings and penetrates the valve body (11), and the first and second sleeves (12, 12 ') are inserted through the two openings, respectively. The tandem solenoid valve according to claim 4, wherein the tandem solenoid valve is provided.   The volume (17) of the oil sump includes the volume change amount of the first spring storage chamber (15) accompanying the movement of the first spool (13) and the second volume accompanying the movement of the second spool (13 '). 6. The tandem solenoid valve according to claim 4, wherein the tandem solenoid valve is larger than a sum of volume changes of the spring storage chamber (15 ′).

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