JP2007127139A - Breather device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breather device capable of achieving intake and exhaust while preventing oil leakage. <P>SOLUTION: An interposed plate 5 having an exhaust hole 5c and an intake hole 5b is provided in a breather valve 1 so as to be interposed in a passage 10 making a sealed space of a sealing device to be attached communicate with the outside, and a first valve 8 energized so as to close the exhaust hole 5c of the interposed plate 5 by a first spring 9 and a second valve 6 energized so as to close the intake hole 5b of the interposed plate 5 by a second spring 7 are arranged to face each other through the interposed plate 5. Thus, intake and exhaust can be achieved by the one breather valve 1 while preventing oil leakage. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a breather device that is preferably attached to an upper portion of a sealing device in which liquid is sealed in a sealed space, such as an automatic transmission and a differential device mounted on a vehicle.

  Conventionally, for example, in a sealing device typified by an automatic transmission, a differential device, etc. mounted on a vehicle, lubricating oil is enclosed in a sealed case, and leakage of the lubricating oil is prevented. There is provided a breather device (breather plug) for communicating outside air so that the internal pressure does not increase (Patent Document 1). This is used, for example, in a differential device of an automobile, and is configured such that a valve is urged toward a cap by a spring urged from the outside air side. In a normal state, a sealed space is sealed, for example, a vehicle When the internal pressure increases, the valve is moved away from the cap against the urging force of the spring by the internal pressure, and the inside and the outside air are communicated. It is possible to reduce (exhaust) the internal pressure.

JP 58-13171 A

  By the way, the above-mentioned breather device is used for a sealing device (relatively small differential device) having a relatively small case (sealing space), for example, when it enters a puddle after a long driving state. Even if it is cooled rapidly from a high temperature state, etc., it is used for a sealing device in which the case does not shrink so much and the internal pressure of the sealed space does not drop rapidly.

  However, for example, in a sealing device having a relatively large case (sealed space) represented by an automatic transmission or the like, when the temperature is rapidly cooled from a high temperature state, the case contracts and the internal pressure of the sealed space rapidly decreases. Occurs. For this reason, when a breather device capable of only exhausting as described above is used, the seal ring sealing the rotating shaft protruding from the case, for example, is deformed or dropped due to a sudden change in internal pressure, and functions as a seal ring. There is also a risk of damaging or the function inside the sealing device (for example, the function of the speed change mechanism).

  Therefore, for example, separately from the breather device capable of only exhausting, it is conceivable to newly provide a check valve that seals oil and allows intake. However, in order to dispose the breather device and the check valve, for example, it is necessary to make two holes in the case, which causes problems such as enlargement of the case accompanying the increase in case strength. Since the check valve is newly provided, the number of parts and the manufacturing process are increased. Furthermore, in order to newly arrange a check valve, it is necessary to provide a new installation space between a sealing device such as an automatic transmission or a differential device and another device adjacent thereto or a body frame, for example. As a result, there is a problem that the vehicle to be mounted is also enlarged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a breather device that enables intake and exhaust while preventing leakage of liquid sealed in a sealed space.

The present invention according to claim 1 is attached to a sealing device having a sealed space in which a liquid is enclosed, and the breather device (1) is interposed between the sealed space and the outside.
A passage (10) having an exhaust passage (for example, 5c) and an intake passage (for example, 5b) communicating the sealed space and the outside;
A first valve (8) for closing or opening the exhaust passage (eg 5c);
First biasing means (9) for biasing the first valve (8) so as to close the exhaust passage (for example, 5c);
Closing or opening the intake passage (for example, 5b), and a second valve (6) disposed opposite to the first valve (8);
Second urging means (7) for urging the second valve (6) so as to close the intake passage (for example, 5b),
The breather apparatus (1) is characterized in that.

The present invention according to claim 2 is an interposed member having an exhaust hole (5c) forming the exhaust passage and an intake hole (5b) forming the intake passage interposed on the passage (10). 5a)
The interposed member (5a) is disposed between the first valve (8) and the second valve (6).
The breather device (1) according to claim 1, wherein the breather device (1) is provided.

The present invention according to claim 3 is configured such that the first valve (8) and the second valve (6) are arranged concentrically (CT).
The breather device (1) according to claim 2, wherein the breather device (1) is provided.

According to a fourth aspect of the present invention, the urging force of the first urging means (9) is applied so that the liquid causes the first valve (8) to pass through the exhaust hole (5b) as the sealing device is inclined. The pressure in the sealed space is configured to be greater than the first pressure (P1), and the pressure in the sealed space is configured to be lower than the second pressure (P2) in the increased state at a predetermined high temperature state.
It exists in the breather apparatus (1) of Claim 2 or 3 characterized by the above-mentioned.

In the present invention according to claim 5, the second pressure (P2) is a pressure within a range in which the sealed state of the sealed space can be maintained.
The breather device (1) according to claim 4, wherein the breather device (1) is provided.

According to a sixth aspect of the present invention, the sealing device includes a case main body, a hole formed in the case main body, a rotation shaft protruding from the hole, and a gap between the hole and the rotation shaft. A sealing member for sealing
The second pressure (P2) is a pressure within a range in which the function of the seal member can be maintained by the pressure of the sealed space.
The breather device (1) according to claim 5, wherein the breather device (1) is provided.

According to a seventh aspect of the present invention, the interposition member (5a) has a disk shape having the intake hole (5b) in the center and the exhaust hole (5c) on the outer peripheral side of the intake hole (5b). Formed into
The first and second urging means comprise first and second coil springs (9, 7), respectively.
The first valve (8) has a hollow hole (8a) in a portion corresponding to the intake hole (5b) and is formed in a hollow disk shape having a larger diameter than the exhaust hole (5c), The exhaust hole (5c) can be closed,
The second valve (6) is formed in a disc shape having a diameter larger than that of the intake hole (5b) and smaller than that of the exhaust hole (5c), and can close the intake hole (5b). And
The interposing member (5a), the first and second coil springs (9, 7), the first and second valves (8, 6), and the interposing member (5a) of the passage (10) are used to form the sealed space. The side parts (10A, 10B) are arranged on the concentric (CT),
It exists in the breather apparatus (1) in any one of Claim 2 thru | or 6 characterized by the above-mentioned.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the first valve that closes or opens the exhaust passage and the second valve that closes or opens the intake passage are disposed opposite to each other on the passage that connects the sealed space and the outside. Therefore, it is possible to allow both intake and exhaust while preventing leakage of the liquid sealed in the sealed space. Thus, while the sealing device can be protected, for example, it is not necessary to newly provide a check valve, and the number of parts, the manufacturing process, the case of the sealing device can be increased. And enlargement of mounted vehicles can be prevented.

  According to the second aspect of the present invention, since the interposition member having the exhaust hole and the intake hole is disposed between the first valve and the second valve, the exhaust hole is blocked or opened by the first valve. In addition, both the closing and opening of the intake hole by the second valve can be made possible by a single interposed member, and the breather device can be made compact.

  According to the third aspect of the present invention, since the first valve and the second valve are arranged concentrically, the breather device can be made compact.

  According to the fourth aspect of the present invention, the biasing force of the first biasing means is set to be larger than the first pressure in a state where the liquid presses the first valve through the exhaust hole as the sealing device is inclined. In addition, since the pressure in the sealed space is configured to be lower than the second pressure in a predetermined high temperature state and increased, for example, even if the sealing device is inclined (upside down), the liquid sealed in the sealed space Leakage can be reliably prevented, and the air can be exhausted before the air pressure in the sealed space reaches a predetermined high temperature and is raised, so that the sealing device can be reliably protected.

  According to the fifth aspect of the present invention, since the second pressure is a pressure within a range in which the sealed state of the sealed space can be maintained, the sealed state of the sealing device can be maintained. It can be surely protected.

  According to the sixth aspect of the present invention, since the second pressure is a pressure within a range in which the sealing member can maintain its function by the atmospheric pressure of the sealed space, the exhaust is performed while maintaining the sealing function of the sealing device. The sealing state in the sealing device can be reliably protected.

  According to the seventh aspect of the present invention, the intervening member, the first and second coil springs, the first and second valves, and the portion on the sealed space side from the intervening member of the passage are arranged concentrically. In particular, it is possible to provide a breather device capable of preventing leakage of liquid and intake / exhaust without significantly changing the external shape of the conventional breather device.

  Further, since the first valve is formed in a hollow disk shape and the second valve is formed in a disk shape, it is possible to make intake and exhaust air concentrically. Even if the second valve is concentric with the portion on the sealed space side from the intervening member of the passage, for example, even if liquid suddenly flows in from the passage, the flow is buffered, and the fluid pressure of the liquid is directly applied to the first valve. Can be prevented. As a result, liquid leakage can be prevented more reliably.

  Further, when the first valve opens the exhaust hole, the second valve exhausts through the outer peripheral side of the second valve, the exhaust hole, and between the interposed plate and the first valve (or the hollow hole), and the second valve When the air intake hole is opened, it becomes possible to intake air through the hollow hole of the first valve, the air intake hole, and the outer peripheral side of the second valve, and the first valve, the interposed member, and the second valve Intake or exhaust can be achieved with a compact configuration in which the plates are arranged in parallel.

  Hereinafter, embodiments according to the present invention will be described with reference to FIGS. 1 to 5.

  A breather device (hereinafter referred to as “breather valve”) 1 according to the present invention is provided in a mounting hole (or a hose or the like) drilled in an upper portion of a transmission case of an automatic transmission (sealing device) mounted on a vehicle, for example. Usually, it is used in the up-down direction shown in FIG. 1 (at least in the direction in which the X1 direction is above the side). The transmission case of an automatic transmission is normally sealed to form a sealed space, and an automatic transmission fluid (liquid) (hereinafter referred to as “lubricant”) for controlling hydraulic pressure of a transmission gear mechanism and for lubrication is contained in the sealed space. , “ATF”).

  As shown in FIG. 1, the breather valve 1 includes a valve case 2 including a main body case 3 and a cover case 4, and a passage 10, which will be described in detail later, is formed in the valve case 2. The main body case 3 is made of, for example, a relatively hard metal or resin, and has a substantially circular tube portion 3A, and a mounting portion 3B on which a gasket 5 and a cover case 4 described later can be mounted in detail. Configured.

  A through-hole 3 a centering on a central axis (concentric) CT is formed inside the tube portion 3 </ b> A of the main body case 3, and constitutes a part of the passage 10 </ b> A. On the outside of the tube portion 3A, a flange portion 3b is formed approximately in the middle of the tube portion 3A in the X1-X2 direction, and is formed in, for example, a three-stage hanging shape on the X2 direction side from the flange portion 3b. A mounting portion 3c is provided. The attachment portion 3c can be crimped and attached to an attachment hole in the upper part of the transmission case of the automatic transmission. At the time of attachment, the flange portion 3b is positioned in contact with the transmission case.

  On the other hand, the mounting portion 3B of the main body case 3 is formed in a substantially flange shape as a whole, has a larger diameter than the through hole 3a inside, and is smaller than a second valve plate (second valve) 6 described later. A hole 3d having a small inner diameter is formed, and communicates with the through hole 3a to constitute a part of the passage 10B. A plurality of grooves 3e are formed on the inner peripheral surface of the hole portion 3d, for example, at equal positions in the circumferential direction, and engaging portions 5h of leg portions 5g of the gasket 5 described later can be fitted into the groove portions 3e. It is configured as follows. Further, since the opening portion of the hole portion 3d has a smaller diameter than the second valve plate 6 as described above, the contact portion 3f that abuts when the second valve plate 6 is driven to move in the X2 direction. ing. The end portion in the X2 direction of the mounting portion 3B is provided with a pressure contact portion 3g having an inner peripheral side formed in a taper shape and a tip end tapered. The gasket 5 is pressed against a gasket 5 described later. And the main body case 3 are sealed.

  The gasket 5 is made of, for example, a metal or resin having a relatively low hardness, and is roughly formed in a disc shape, and is interposed between the passage 10 and the interposed plate. And a plurality of leg portions 5g extending substantially vertically from 5a. In the gasket 5, the engaging portion 5h, which is the tip portion of the leg portion 5g, is fitted and engaged with the outer peripheral surface of the groove portion 3e of the case body 3, and the outer peripheral portion of the interposition plate 5a is the press-contact portion 3g. Is attached to the main body case 3 in a sealed manner, and is attached to the attachment portion 3B of the main body case 3 around the central axis CT. Has been.

  The inner peripheral surface of the leg portion 5g of the gasket 5 is formed to have a larger diameter than the outer diameter of the second valve plate 6 which will be described later, and hinders the movement of the second valve plate 6 in the X1-X2 direction. In particular, the engaging portion 5h is present only on the outer peripheral side of the groove portion 3e of the case body 3 to form a gap on the inner peripheral side of the groove portion 3e, and the second valve plate 6 is formed on the contact portion 3f. Even if the opening portion of the hole 3d is closed by contact, a passage through which air is conducted is secured.

  As shown in FIG. 2, the interposition plate 5a is formed with an intake hole (intake passage) 5b in the center portion, and, for example, four exhaust holes (exhaust passages) 5c on the outer peripheral side of the intake hole 5b. Is formed. In other words, the inner peripheral annular portion 5d that partitions the intake hole 5b and the four exhaust holes 5c is formed on the inner peripheral side of the outer peripheral annular portion 5f so as to be supported by the four bridges 5e. . In the present embodiment, the case where the number of exhaust holes 5c is four is described as an example, but it goes without saying that the number of exhaust holes 5c may be any number.

  On the other hand, as shown in FIG. 1, the hole 3 d formed in the gasket 5 has a second valve plate 6 disposed so as to face the surface of the interposition plate 5 a in the X2 direction, and the hole. A second spring (second biasing means) 7 contracted between the bottom portion 3h of the portion 3d and the second valve plate 6 is provided at a position centered on the central axis CT. The second valve plate 6 has a rubber disc shape, for example, and has an outer diameter larger than the intake holes 5b and smaller than the positions of the four exhaust holes 5c. Yes. Thus, the second valve plate 6 is configured to be able to close or open only the intake hole 5b based on the urging force of the second spring 7.

  The urging force of the second spring 7 is, for example, an atmospheric pressure (hereinafter referred to as “internal pressure”) in a sealed space of a transmission case of an automatic transmission to which the breather valve 1 is attached. When the pressure drops below the "outside air pressure"), the internal pressure at which the seal ring between the transmission case and the input shaft or output shaft can maintain the sealing function due to the differential pressure, that is, the seal ring is deformed or dropped. The second valve plate 6 may be an urging force that can move and drive the second valve plate 6 in the X2 direction before the pressure decreases to the internal pressure that impairs the sealing function. A relatively weak urging force that moves in the X2 direction is sufficient.

  It should be noted that when the internal air pressure decreases, the pressure at which the seal ring impairs the sealing function is generally the highest pressure for protecting the automatic transmission (because it cannot withstand the pressure drop). However, if there are other parts in the automatic transmission that impair the function at a pressure higher than the "inner air pressure at which the seal ring impairs the sealing function", it is not limited to this. In this case, of course, the urging force of the second spring 7 is set to be weaker than the pressure at which the function of the part is impaired.

  On the other hand, on the X1 direction side of the mounting portion 3B of the main body case 3, a cover case 4 made of, for example, metal or resin, which is formed in a generally cup shape as a whole, is connected to the front edge 4e of the cover case 4 by the pressure contact. It is mounted in a form that is crimped to the part 3g. Inside the cover case 4 are a small-diameter hole portion 4a having an inner diameter smaller than a first valve plate (first valve) 8 to be described later, and a diameter larger than the first valve plate 8 and the pressure contact portion 3g. A large-diameter hole portion 4c having an inner diameter substantially the same diameter as the outer diameter is formed, and the passage 10B is formed by the small-diameter hole portion 4a and the large-diameter hole portion 4c via the intake hole 5b or the exhaust hole 5c. A portion of the passage 10 communicating with the passage 10C is configured. Further, the opening portion of the small-diameter hole portion 4a has an abutting portion 4d that abuts when the first valve plate 8 is driven to move in the X1 direction because the small-diameter hole portion 4a has a smaller diameter than the first valve plate 8. It has become. For example, one groove portion 4d is formed on the inner peripheral surface of the large-diameter hole portion 4c (see the left side in FIG. 1), and the pressure contact portion 3g of the main body case 3 and the cover case 4 are large. There is a space between the hole 4c and a part of the passage 10D that communicates with the passage 10C.

  In the small-diameter hole 4a and the large-diameter hole 4c that are enclosed in the cover case 4 and the gasket 5, a first valve plate 8 disposed opposite to the surface in the X1 direction of the interposition plate 5a, A first spring (first urging means) 9 contracted between the bottom portion 4b of the small diameter hole 4a and the first valve plate 8 is provided at a position centering on the central axis CT. Yes. That is, the first valve plate 8 and the above-described second valve plate 6 are configured to face each other via the interposition plate 5a.

  The first valve plate 8 is made of, for example, rubber and has a hollow disk shape having a through hole 8a in the center portion. The outer diameter of the first valve plate 8 is larger than that of the exhaust hole 5c, and further from the inner diameter of the small diameter hole portion 4a. Is also formed to have a large diameter. The through hole 8a has an inner diameter that is larger than the intake hole 5b and smaller than the exhaust hole 5c, that is, has a diameter that overlaps the annular portion 5d of the interposition plate 5a. Has been. Accordingly, the first valve plate 8 is configured to be able to close or open only the exhaust hole 5 c based on the urging force of the first spring 9.

  The urging force of the first spring 9 is such that, for example, when the vehicle rolls over, the automatic transmission tilts, and accordingly, the ATF in the transmission case causes the first valve plate 8 to move through the exhaust hole 5c by its own weight. It is stronger than the first pressure P1 to be pressed (that is, the pressure generated according to the cross-sectional area of all the exhaust holes 5c), and for example, the pressure in the sealed space is increased to a predetermined high temperature state, and the inner pressure is higher than the outer pressure. When the pressure rises, the pressure at which the seal function of the seal ring can be maintained by the differential pressure, that is, before the pressure rises to the internal pressure of the second pressure P2 that causes the seal ring to deform or drop and impair the seal function. In addition, any biasing force may be used as long as the first valve plate 8 can be driven to move in the X1 direction. That is, if the urging force of the first spring 9 is “F” and expressed by a mathematical expression, the relationship “P1 <F <P2” may be satisfied.

  Here, when the internal pressure increases, the pressure within the range in which the seal ring can maintain the sealing function is generally the lowest pressure range for protecting the automatic transmission (it can withstand the highest pressure increase). 2), the second pressure P2 is set to “pressure within a range in which the seal ring can maintain the sealing function”. However, within the automatic transmission, this “pressure within the range in which the seal ring can maintain the sealing function” is set. If there is another part that impairs the function at a pressure lower than "pressure", this is not the case. In this case, the pressure at which the function of the part is impaired is set as the second pressure P2, and the second pressure P2 is exceeded. Of course, the urging force of the first spring 9 is set to be weak.

  As described above, the breather valve 1 includes the passages 10A, 10B, 10C, and 10D. The passage 10 communicates the sealed space in the transmission case of the automatic transmission with the outside. An intervening plate 5a is interposed between the passages 10C and 10D, and the first valve plate 8 and the second valve plate 6 are arranged to face each other via the intervening plate 5a. Further, all the constituent members are arranged concentrically with the central axis CT as the center, and as a whole, have the same plug shape as the conventional breather plug.

  Next, the operation of the breather valve 1 will be described with reference to FIGS. First, in a normal state, that is, in a state where the vehicle does not roll over and the outside air pressure and the inside air pressure are substantially the same, the first valve plate 8 is moved by the urging force of the first spring 9 as shown in FIG. The exhaust plate 5a is pressed by the intervening plate 5a in the X2 direction, closes the exhaust hole 5c by the first valve plate 8, and the urging force of the second spring 7 causes the second valve plate 6 to face the intervening plate 5a in the X1 direction. When pressed, the second valve plate 6 closes the exhaust hole 5b. In this state, the passages 10A and 10B and the passages 10C and 10D are disconnected, that is, the transmission case of the automatic transmission is in a state where intake and exhaust are not performed.

  Next, when the internal pressure in the transmission case rises above the first pressure P1 described above, for example, when the temperature of the automatic transmission rises (when it reaches a predetermined high temperature state), the exhaust hole 5c. The first pressure P1 acts on the portion of the first valve plate 8 corresponding to the exhaust hole 5c (that is, with respect to the cross-sectional area of the exhaust hole 5c), as shown in FIG. The first valve plate 8 is pressed and driven in the X1 direction against the bias of the 1 spring 9 to open the exhaust hole 5c, and the passages 10A and 10B and the passages 10C and 10D communicate with each other, that is, the second valve plate. 6, the air in the transmission case is exhausted as shown by the arrow AirA through the exhaust hole 5c, between the first valve plate 8 and the interposition plate 5a (or through hole 8a). As a result, the internal pressure in the transmission case is reduced, and the internal pressure does not exceed the second pressure P2 described above, and the automatic transmission is protected.

  At this time, even if the air pressure exhausted from the exhaust hole 5c is particularly strong, the outer peripheral portion of the first valve plate 8 contacts the contact portion 4d and does not move more than necessary in the X1 direction. The first valve plate 8 is prevented from being inclined by the air pressure.

  Thereafter, when the internal pressure in the transmission case is reduced from the first pressure P1 by the above-described exhaust, the urging force of the first spring 9 again exceeds the air pressure exhausted from the exhaust hole 5c, and the first valve The plate 8 presses the interposition plate 5a in the X2 direction to close the exhaust hole 5c, that is, returns to the state shown in FIG.

  Here, when the vertical direction of the automatic transmission is reversed, for example, when the vehicle rolls over, as shown in FIG. 4, the vertical direction (X1-X2 direction) of the breather valve 1 is also reversed, via the passage 10A. ATF flows into the breather valve 1. At this time, the ATF flow is buffered by hitting the vicinity of the center of the disc-shaped second valve plate 6 concentric with the passage 10A, and the fluid pressure is directly applied to the first valve plate 8 through the exhaust hole 5c. It does not occur.

  When the ATF flows into the passage 10B in this way, the weight of the ATF acts on the first valve plate 8 through the exhaust hole 5c, but the urging force of the first spring 9 is Since it is stronger than the first pressure P1 in the pressing state, the first valve plate 9 is not driven to be pressed in the X1 direction, and the exhaust hole 5c remains closed, that is, the ATF is external (passage 10C). Side).

  On the other hand, when the internal pressure in the transmission case is lowered, for example, when the temperature of the automatic transmission is suddenly lowered, it corresponds to the intake hole 5b of the second valve plate 6 closing the intake hole 5b. As shown in FIG. 5, the second valve plate 6 is pressed and driven in the X2 direction against the biasing force of the second spring 7, as shown in FIG. The intake hole 5b is opened, and the passages 10D and 10C and the passages 10B and 10A communicate with each other, that is, through the through hole 8a of the first valve plate 8, the intake hole 5b, and the outer peripheral side of the second valve plate 6. As shown in AirB, the air in the mission case is inhaled. As a result, the negative internal pressure in the transmission case is eliminated, and the automatic transmission is protected without the internal pressure being reduced to a pressure at which the above-described seal ring impairs the function.

  At this time, even if the air pressure sucked from the intake hole 5b is particularly strong, the outer peripheral portion of the second valve plate 6 contacts the contact portion 3f and does not move more than necessary in the X2 direction. The second valve plate 6 is prevented from being inclined by the air pressure.

  When the negative pressure of the internal pressure in the transmission case is eliminated by the intake air described above, the urging force of the second spring 6 again exceeds the air pressure sucked from the intake hole 5b, and the second valve plate 6 is moved in the X1 direction. Then, the intervening plate 5a is pressed to close the intake hole 5b, that is, the state shown in FIG. 1 is restored.

  As described above, according to the breather valve 1 according to the present invention, the first valve plate 8 that closes or opens the exhaust hole 5c and the second valve plate 6 that closes or opens the intake hole 5b are sealed in the transmission case. Since it is disposed oppositely on the passage 10 that communicates the space and the outside, it is possible to prevent both ATF enclosed in the sealed space in the mission case and to allow both intake and exhaust. it can. As a result, although it is possible to protect the automatic transmission, it is possible to eliminate the need for a new check valve, for example, increase the number of parts, increase the manufacturing process, It is possible to prevent the mounted vehicle from becoming enlarged.

Further, since the intervening plate 5a having the exhaust hole 5c and the intake hole 5b is disposed between the first valve plate 8 and the second valve plate 6, the exhaust hole 5c is blocked by the first valve plate 8 or Both the opening and the closing or opening of the intake hole 5b by the second valve plate 6 can be made possible by the single interposed plate 5a, and the breather valve 1 can be made compact.
Further, since the first valve plate 8 and the second valve plate 6 are arranged on the concentric CT, the breather valve 1 can be made compact.

  Further, the urging force of the first spring 9 is set to be larger than the first pressure P1 in a state where the ATF presses the first valve plate 8 through the exhaust hole 5c with the inclination of the automatic transmission, and the transmission case. Since the pressure in the sealed space is set to be lower than the second pressure P2 in a predetermined high temperature state and increased, the automatic transmission is sealed in the sealed space even if the automatic transmission is inclined (upside down). In addition, the ATF can be reliably prevented from leaking, and the air can be exhausted before the air pressure in the sealed space reaches a predetermined high temperature state and is raised, so that the automatic transmission can be reliably protected.

  In particular, the second pressure P2 is a pressure within a range where the sealed state of the sealed space can be maintained, and more specifically, within a range where the seal ring can maintain its function by the atmospheric pressure in the mission case. Therefore, the exhaust can be performed while maintaining the sealing function of the automatic transmission, and the sealed state in the automatic transmission can be reliably protected.

  Furthermore, the passages 10A and 10B on the side of the sealed space with respect to the intervening plate 5a, the first and second coil springs 9 and 7, the first and second valve plates 8 and 6 and the intervening plate 5a of the passage 10 are center axes CT. Since they are arranged concentrically, they can be configured as a single plug. In particular, ATF leakage can be prevented and intake / exhaust can be achieved without significantly changing the external shape of the conventional breather device. A breather valve 1 can be provided.

  Further, since the first valve plate 8 is formed in a hollow disk shape and the second valve plate 6 is formed in a disk shape, it is possible to allow intake and exhaust air concentrically, Even if the disc-shaped second valve plate 6 is concentric with the passages 10A and 10B on the side of the sealed space from the intervening plate 5a of the passage 10, for example, even if ATF flows in rapidly from the passage 10A, the flow is reduced. It can buffer, and it can prevent that the fluid pressure of ATF arises in the 1st valve board 8 directly. As a result, ATF leakage can be prevented more reliably.

  Further, when the first valve plate 8 opens the exhaust hole 5c, the outer peripheral side of the second valve plate 6, the exhaust hole 5c, and between the interposition plate 5a and the first valve plate 8 (or the through hole 8a). When the second valve plate 6 opens the intake hole 5b, the intake air passes through the through hole 8a, the intake hole 5b, and the outer peripheral side of the second valve plate 8 when the second valve plate 6 opens the intake hole 5b. It is possible to perform intake and exhaust while having a compact configuration in which the three plates of the first valve plate 8, the intervening plate 5a, and the second valve plate 6 are arranged in parallel.

  In the above-described embodiment, the case where the breather valve 1 is used in an automatic transmission has been described as an example. However, the present invention is not limited thereto, and liquid is sealed in a sealed space such as a differential device and a fuel tank. Needless to say, the present invention can be applied to any sealing device. In addition, it goes without saying that the liquid at this time varies depending on the sealing device, such as oil such as lubricating oil, gasoline, light oil, etc., but what kind of liquid is enclosed. Even if it exists, this invention can be applied.

Further, the breather valve 1 is formed in a substantially plug shape as a whole, and each component member is concentrically arranged. However, the shape of the breather valve 1 can be changed depending on the sealing device to be used and its vehicle mountability. Even if the first and second valves are arranged, the present invention is within the scope of application if the first and second valves are arranged to face each other and enable intake and exhaust and prevention of liquid leakage. At this time, in particular, the passages 10A and 10B are not formed in a straight line, but may be bent to buffer the liquid flow.
Furthermore, although this breather valve 1 demonstrated what the interposition board 5a intervened between the 1st valve board 8 and the 2nd valve board 6, it is not restricted to this, For example, the 1st valve board 8 exhausts. A member such as a stopper that positions the passage at a closed position, or a member such as a stopper that positions the second valve plate 6 at a position where the intake passage is blocked, may be disposed. It does not matter if it is not interposed.

  In the breather valve 1, the first and second valves are formed in a plate shape and are energized by the first and second springs, which are coil springs, respectively. The shape of the valve may be any shape that can close or open the intake hole and the exhaust hole, and may be an urging means such as a leaf spring as long as the first and second valves can be urged. May be.

Sectional drawing which shows the breather valve | bulb which concerns on this invention. AA arrow sectional drawing in FIG. Sectional drawing which shows the time of exhaust_gas | exhaustion of this breather valve. Sectional drawing which shows the case where the pressure of oil arises in this breather valve. Sectional drawing which shows the time of intake of this breather valve.

Explanation of symbols

1 Breather device (breather valve)
5a Intervening member (intervening plate)
5b Intake passage, intake hole 5c Exhaust passage, exhaust hole 6 Second valve (second valve plate)
7 Second urging means, second coil spring (second spring)
8 First valve (first valve plate)
8a Hollow hole (through hole)
9 First biasing means, first coil spring (first spring)
10 Passage CT Concentric (Center axis)
P1 First pressure P2 Second pressure

Claims (7)

In a breather device attached to a sealing device having a sealed space in which a liquid is enclosed, and interposed between the sealed space and the outside,
A passage having an exhaust passage and an intake passage communicating the sealed space with the outside;
A first valve for closing or opening the exhaust passage;
First biasing means for biasing the first valve so as to close the exhaust passage;
Closing or opening the intake passage, and a second valve disposed opposite the first valve;
Second urging means for urging the second valve so as to close the intake passage,
Breather device characterized by the above. An interposition member having an exhaust hole that forms the exhaust path and an intake hole that forms the intake path, interposed on the passage;
The interposition member is disposed between the first valve and the second valve;
The breather apparatus according to claim 1. The first valve and the second valve are arranged concentrically;
The breather apparatus according to claim 2. The sealed space is configured so that the biasing force of the first biasing means becomes larger than a first pressure in a state where the liquid presses the first valve through the exhaust hole as the sealing device is inclined. The internal pressure is configured to be lower than the second pressure in the elevated state at a predetermined high temperature state,
The breather apparatus according to claim 2 or 3, wherein The second pressure is a pressure within a range in which the sealed state of the sealed space can be maintained.
The breather device according to claim 4. The sealing device includes a case main body, a hole formed in the case main body, a rotating shaft protruding from the hole, and a seal member that seals between the hole and the rotating shaft. And
The second pressure is a pressure within a range in which the function of the seal member can be maintained by the pressure of the sealed space.
The breather apparatus according to claim 5. The interposition member is formed in a disc shape having the intake hole at the center and the exhaust hole on the outer peripheral side of the intake hole,
The first and second urging means comprise first and second coil springs, respectively.
The first valve has a hollow hole in a portion corresponding to the intake hole, and is formed in a hollow disk shape having a larger diameter than the exhaust hole, so that the exhaust hole can be closed,
The second valve is formed in a disk shape having a diameter larger than that of the intake hole and smaller than that of the exhaust hole, and is capable of closing the intake hole.
A portion on the sealed space side of the interposition member, the first and second coil springs, the first and second valves, and the passage on the sealed space side is disposed concentrically;
The breather apparatus according to any one of claims 2 to 6,

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