JP2021143694A - Breather device for vehicle - Google Patents

Abstract

To provide a breather device for a vehicle capable of intake and exhaust and capable of stopping intake when sudden intake occurs.SOLUTION: A first valve member 22 is formed with a through hole 24 communicating with a communication hole 20. A second valve member 32 is integrally provided with an intake valve element 36 that functions as an intake valve part that can be displaced to the first valve member 22 side with a gap S1 on a case outer space E2 side of the first valve member 22. The intake valve element 36 closes the through hole 24 by being displaced toward the first valve member 22 side until a gap S1 disappears due to an intake speed Vi due to a differential pressure Ps1 at the time of intake. Consequently, in a breather device 10 for a vehicle capable of intake and exhaust, intake can be stopped when sudden intake occurs such that the gap S1 disappears.SELECTED DRAWING: Figure 1

Description

The present invention relates to a breather device for a vehicle.

A vehicle breather device for eliminating the pressure difference between the internal space and the external space of a case that houses a power transmission mechanism, such as a transmission case or a transformer axle case, and is a vehicle breather device capable of both intake and exhaust. Has been proposed. For example, the breather device described in Patent Document 1 is that.

Japanese Unexamined Patent Publication No. 2009-106024

By the way, in the breather device of Patent Document 1, when the pressure applied to the intake valve becomes large, the coil spring contracts to perform intake. For this reason, for example, when the case is covered with water and cooled while traveling in a flooded passage, a negative pressure is generated in the case, the intake valve opens, sudden intake occurs, and water is sucked together with air. There is a possibility that it will end up.

The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide a breather device for a vehicle capable of inhaling and exhausting and stopping intake when sudden intake occurs. To do.

The gist of the present invention is (1) a vehicle breather device capable of intake and exhaust between the space inside the case and the space outside the case, and (2) a communication hole communicating with the space inside the case. The formed breather main body, (3) a cap that covers the opening edge of the communication hole on the outer space side of the case of the breather main body, and (4) a first that is sequentially arranged on the opening edge in the cap. A valve member and a second valve member are provided, (5) the first valve member is formed with a through hole that communicates with the communication hole, and (6) the second valve member has the said first valve member. A displaceable intake valve portion is integrally provided on the first valve member side with a gap on the outer space side of the case. (7) The intake valve portion is the first until the gap disappears due to the differential pressure at the time of intake. 1 The purpose is to close the through hole by being displaced toward the valve member side.

According to the vehicle breather device of the present invention, the first valve member is formed with a through hole that communicates with the communication hole, and the second valve member is on the outer space side of the case of the first valve member. An intake valve portion that can be displaced to the first valve member side with a gap is integrally provided, and the intake valve portion is displaced to the first valve member side by the differential pressure at the time of intake until the gap disappears. This closes the through hole. Therefore, in a vehicle breather device capable of intake and exhaust, when sudden intake occurs such that the gap between the first valve member and the intake valve portion is closed, the through hole of the first valve member is the intake valve. Since it is blocked by the part, the intake can be stopped.

Here, preferably, an intake hole is formed in the second valve member, and the second valve member connects the intake valve portion to the inner circumference of the intake hole so as to be displaceable toward the first valve member. The intake valve connection portion is integrally provided, and the intake valve portion is provided inside the intake hole and is larger than the through hole. Therefore, the through hole of the first valve member can be closed by the intake valve portion with a simple configuration.

Further, preferably, when the intake speed of the air passing through the gap is lower than the predetermined value, the intake valve portion does not block the through hole, but the intake speed of the air passing through the gap is equal to or higher than the predetermined value. In that case, the intake valve portion closes the through hole. Therefore, when the intake speed is relatively slow, intake is possible, and when the intake speed is relatively high, intake is not possible.

Further, preferably, the second valve member, the first valve member, and the third valve member are arranged in this order on the opening edge in the cap, and the first valve member is formed on the third valve member. An exhaust valve portion displaceable on the first valve member side is integrally provided on the outer space side of the case with a gap, and the exhaust valve portion is the first until the gap disappears due to the differential pressure during exhaust. The through hole is closed by being displaced toward the valve member side. Therefore, in a vehicle breather device capable of intake and exhaust, the exhaust can be stopped when a sudden exhaust that eliminates a gap occurs.

Further, preferably, the second valve member has an intake hole at a position that does not overlap with the through hole, and the intake valve portion is a sheet-like member whose center bulges toward the outer space side of the case. Therefore, the through hole of the first valve member can be closed by the intake valve portion with a simple configuration.

It is sectional drawing of the breather device for a vehicle which is an Example of this invention. It is a top view which shows the 1st valve member in the breather device for a vehicle of FIG. It is a top view which shows the 2nd valve member in the breather device for a vehicle of FIG. It is a top view which shows the 1st spacer in the breather device for a vehicle of FIG. It is sectional drawing which passes through the central axis C1 of the breather device for a vehicle of FIG. 1, and is the figure which shows the state which the intake valve has closed the through hole. It is sectional drawing which passes through the central axis C1 of the breather device for a vehicle of FIG. 1, and is the figure which shows the state at the time of exhaust. FIG. 5 is an enlarged cross-sectional view showing only the first valve member, the first spacer, and the second valve member of the vehicle breather device in the state of FIG. 1. FIG. 5 is an enlarged cross-sectional view showing only the first valve member, the first spacer, and the second valve member of the vehicle breather device in the state of FIG. It is a figure which shows the cross section of the breather device for a vehicle of another Example of this invention, and is the figure corresponding to FIG. 9 is a plan view showing a third valve member in the vehicle breather device of FIG. 9. 9 is a plan view showing a second spacer in the vehicle breather device of FIG. 9. 9 is a perspective view showing a cylindrical spacer in the vehicle breather device of FIG. 9. It is a figure which shows the cross section of the breather device for a vehicle of still another Example of this invention, and is the figure corresponding to FIG. It is a top view which shows the 1st valve member in the breather device for a vehicle of FIG. It is a top view which shows the 2nd valve member in the breather device for a vehicle of FIG. It is a figure which shows the cross section of the breather device for a vehicle of FIG. 13, and is the figure corresponding to FIG. It is a figure which shows the cross section of the breather device for a vehicle of still another Example of this invention, and is the figure which shows the state which the annular exhaust valve part has closed the through hole. It is a figure which shows the cross section at the time of exhausting of the breather device for a vehicle of FIG. 17, and is the figure corresponding to FIG. It is a figure which shows the cross section at the time of intake | intake of the breather device for a vehicle of FIG. 17, and is the figure corresponding to FIG. FIG. 17 is a view showing a cross section of the vehicle breather device of FIG. 17, in which the intake valve portion has a through hole closed, and is a view corresponding to FIG. It is a figure which shows another example of the 1st valve member and the 2nd valve member provided in the breather device for a vehicle of FIG. It is a figure which shows still another example of the 1st valve member and the 2nd valve member provided in the vehicle breather device of FIG. It is a figure which shows still another example of the 2nd valve member provided in the breather device for a vehicle of FIG. It is a figure which shows still another example of the 2nd valve member provided in the breather device for a vehicle of FIG. It is a figure which shows still another example of the 2nd valve member provided in the breather device for a vehicle of FIG.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. In the following examples, the drawings are appropriately simplified or deformed, and the dimensional ratios and shapes of each part are not necessarily drawn accurately.

FIG. 1 is a cross-sectional view of a vehicle breather device (hereinafter referred to as a breather device) 10 according to an embodiment of the present invention, passing through the central axis C1. The breather device 10 is provided, for example, in a case 12 including an electric motor and a gear mechanism of a vehicle (not shown). The space inside the case E1 is a substantially sealed space, and is filled with oil or the like for the purpose of cooling an electric motor, lubricating various gear mechanisms, or the like. The case inner space E1 and the case outer space E2 are communicated with each other by, for example, a breather device 10 provided on the upper part of the case 12, and intake and exhaust are performed.

The breather device 10 includes a breather main body 14 and a cap 18. The breather body 14 is, for example, a substantially cylindrical member centered on the central axis C1, a screw portion 14a to be fastened to the case 12 is formed at one end in the direction of the central axis C1, and a flange is formed at the other end. Part 14b is formed. The breather main body 14 is provided with a communication hole 20 that penetrates the breather main body 14 in the central axis C1 direction and communicates with the case inner space E1. The cap 18 has a bottomed tubular shape, and an engaging protrusion 18a that partially protrudes to the inner peripheral side is formed at an end portion on the opening side thereof. By engaging the engaging projection 18a with the flange portion 14b of the breather body 14 so that the cap 18 does not come off from the breather body 14, the opening of the communication hole 20 which is the end surface of the breather body 14 on the case outer space E2 side. The cap 18 is fitted to the breather body 14 so as to cover the edge 20a.

The breather device 10 has a first valve member 22, a first spacer 26, and a second valve member 32 which are sequentially arranged on the opening edge 20a inside the cap 18. Further, the breather device 10 is inserted between the cap 18 and the first valve member 22 in a preloaded state, and the first valve member 22, the first spacer 26, and the second valve member 32 are inserted into the opening edge 20a. It has a coil spring 28 that urges toward and seats the first valve member 22 on the opening edge 20a. FIG. 2 is a plan view of the first valve member 22 viewed from the case outer space E2 side in the central axis C1 direction, and FIG. 3 is a plan view of the second valve member 32 viewed from the case outer space E2 side in the central axis C1 direction. FIG. 4 is a plan view of the first spacer 26 as viewed from the case outer space E2 side in the central axis C1 direction.

The first valve member 22 is, for example, a disk-shaped member made of synthetic resin, rubber, metal, or the like, and the second valve member 32 has lower rigidity and is relatively more flexible than, for example, the first valve member 22. It is a disk-shaped member made of synthetic resin, rubber, or the like.

As shown in FIG. 1, the first valve member 22 has one through hole 24 penetrating in the central axis C1 direction (thickness direction), and the through hole 24 communicates with the communication hole 20. .. As shown in FIG. 3, the second valve member 32 is formed with a C-shaped intake hole 34 having a diameter larger than that of the through hole 24. The C-shaped intake hole 34 penetrates the second valve member 32 in the central axis C1 direction (thickness direction). An intake valve 36 which is formed to have a diameter larger than that of the through hole 24 and opens and closes the through hole 24 is provided on the inner circumference of the intake hole 34. Further, the second valve member 32 is integrally provided with an intake valve connecting portion 38 that connects the intake valve child 36 and the outer peripheral edge of the second valve member 32. The intake valve connecting portion 38 is positioned inside the intake hole 34 so that the intake valve 36 can be displaced toward the first valve member 22 and can be brought into close contact with the first valve member 22. That is, an intake hole 34 is formed in the second valve member 32, and the second valve member 32 is an intake valve connection that connects the intake valve 36 to the inner circumference of the intake hole 34 so as to be displaceable toward the first valve member 22. It has a portion 38 integrally.

A disk-shaped, that is, an annular first spacer 26 having a first spacer hole 26a larger than the intake valve 36 is sandwiched between the first valve member 22 and the second valve member 32. .. As a result, the intake valve 36 of the second valve member 32 is provided on the case outer space E2 side with a predetermined gap S1 from the first valve member 22. The first spacer 26 is, for example, an annular member made of synthetic resin, rubber, metal, or the like.

Inhalation is performed when the air pressure Pi in the case inner space E1 becomes lower than the air pressure Po in the case outer space E2. Specifically, as shown by the broken line arrow in FIG. 1, the air in the case outer space E2 passes through the intake hole 34 of the second valve member 32 and is between the intake valve 36 and the first valve member 22. It passes through the gap S1, passes through the through hole 24 of the first valve member 22, passes through the communication hole 20, and enters the case inner space E1. FIG. 5 is a cross-sectional view taken through the central axis C1 of the breather device 10 and shows a state in which the intake valve 36 closes the through hole 24 when the intake speed Vi is equal to or higher than a predetermined value Ti. In the gap S1, the differential pressure Ps1 (= Po-Pi) between the air pressure Po in the outer space E2 of the case and the air pressure Pi in the inner space E1 of the case becomes large, and the intake speed Vi of the air passing through the gap S1 is equal to or higher than the predetermined value Ti. In this case, as shown in FIG. 5, the intake valve 36 is provided so as to be displaced toward the first valve member 22 so as to be in close contact with the first valve member 22 and close the through hole 24.

Therefore, in the breather device 10, when the intake speed Vi of the air passing through the gap S1 at the time of intake is equal to or higher than the predetermined value Ti, as shown in FIG. 5, the intake valve 36 is the third until the gap S1 disappears due to the intake speed Vi. The intake air is stopped by shifting to the valve member 22 side and closing the through hole 24. Further, when the intake speed Vi of the air passing through the gap S1 at the time of intake is lower than the predetermined value Ti, as shown in FIG. 1, the gap S1 is not eliminated by the intake speed Vi and the through hole 24 is not closed. Followed. Further, the gap S1 is provided so that the pressure loss is increased and the amount of the pressure loss is reduced when the liquid passes through the gap S1 so that the outflow of oil from the inside of the case 12 and the infiltration of water or the like from the outside of the case 12 can be reduced. Has been done.

FIG. 6 is a cross-sectional view taken through the central axis C1 of the breather device 10 at the time of exhaust. When the differential pressure Ps2 (= Pi-Po) between the air pressure Pi in the case inner space E1 and the air pressure Po in the case outer space E2 is small, the first valve member 22 and the intake valve 36 Since the gap S1 between them is maintained, exhaust through the gap S1 is allowed. However, when the atmospheric pressure Pi in the case inner space E1 is higher than the atmospheric pressure Po in the case outer space E2 and the differential pressure Ps2 (= Pi-Po) rapidly increases, the coil spring 28 contracts as shown in FIG. The member 22 and the second valve member 32 move to the case outer space E2 side. As a result, the case inner space E1 communicates with the case outer space E2 through the communication hole 20, and exhaust is performed as shown by the broken line arrow in FIG. Regarding exhaust, the elastic modulus of the coil spring 28 may be changed so that exhaust is performed when the exhaust speed Vo is equal to or higher than a predetermined value To.

The dimensions and materials of the first valve member 22 and the second valve member 32 are set in the gap S1 so that the gap S1 is reduced when the differential pressure Ps1 (= Po-Pi) rapidly increases, for example, due to the rapid cooling of the case 12. ing. 7 and 8 are enlarged cross-sectional views showing only the first valve member 22, the first spacer 26, and the second valve member 32 in the breather device 10 of FIG. FIG. 7 shows a state at the time of intake when the intake speed Vi is lower than the predetermined value Ti. FIG. 8 shows a state in which the intake valve 36 closes the through hole 24 when the intake speed Vi is equal to or higher than a predetermined value Ti.

As shown in FIGS. 7 and 8, the breather device 10 is provided with, for example, an annular protrusion 36a in the intake valve 36 of the second valve member 32 in order to provide a narrower gap S1a in the gap S1. May be good. By providing a narrower annular gap S1a in the gap S1 between the first valve member 22 and the second valve member 32 in this way, non-uniformity that tends to occur on the case outer space E2 side of the through hole 24 during intake air is provided. Since the negative pressure becomes uniform, a stronger negative pressure can be evenly received by the intake valve 36. Further, even when water enters the cap 18, a film having a uniform pressure is formed inside the protrusion 36a due to the capillary phenomenon, so that the intrusion of water or the like into the case inner space E1 can be further reduced.

In the conventional breather device, the prevention of foreign matter from entering from the outside and the exhaust when the pressure of the case internal space E1 rises are emphasized, and the intake performance when the case internal space E1 becomes negative pressure is not emphasized. .. For this reason, there is a possibility that the inside of the case of the vehicle electric motor becomes excessively negative pressure, or the lip of the oil seal is excessively pressed by the negative pressure and becomes excessively worn. On the other hand, if a hose is attached to the breather device and the opening of the hose is provided at a high position in order to satisfy the two functions of exhaust and intake, there is a problem in securing the installation space and cost. rice field.

Further, when the coil spring for adjusting the exhaust gas and the coil spring for adjusting the intake air are provided coaxially as in the breather device of Patent Document 1, there is a state in which the urging forces of the two coil springs antagonize each other. Assembling becomes more difficult, and there is a problem that the performance also varies due to variations in component dimensions and changes in the sliding state. Further, in order to keep both the exhaust gas and the intake air closed, in the case of the breather device of Patent Document 1, it is necessary to make the urging force of the coil spring that adjusts the exhaust gas larger than that of the coil spring that adjusts the intake air. , The degree of freedom of intake / exhaust characteristics was low. Further, a negative pressure is generated when the case is cooled by being covered with water when the vehicle is traveling on a flooded road, but in the case of the breather device of Patent Document 1, when the pressure applied to the intake valve becomes large, the coil spring is generated. Since it shrinks and inhales, there is a possibility that water will be sucked in together with the air.

However, in the breather device 10 of the present embodiment, the first valve member 22 is formed with a through hole 24 that communicates with the communication hole 20, and the intake valve 36 is formed in the second valve member 32 in the case outer space E2 of the first valve member 22. Since the first valve member 22 is displaceable with a gap S1 on the side, both intake and exhaust can be performed between the case inner space E1 and the case outer space E2 with a simple configuration. There is.

Further, since the gap S1 is provided so as to disappear when the intake speed Vi is equal to or higher than the predetermined value Ti, the case 12 is covered with water and cooled, for example, when traveling on a flooded passage, and a negative pressure is generated. When sudden intake occurs, the through hole 24 can be closed by the intake valve 36 to reduce the ingress of water or the like. Further, for example, even when the pressure inside the case 12 suddenly rises, the oil blowout can be reduced, and the oil can be exhausted when the pressure inside the case 12 has settled down to some extent. Further, by providing the gap S1 so as to increase the pressure loss due to the flow path resistance and reduce the outflow amount when the liquid passes through the gap S1, water or the like can enter from the outside of the case 12 and the breather device 10 It is possible to reduce the outflow of oil and the like in the case 12 when the is laid on its side.

Further, the intake valve 36 is provided on the case outer space E2 side of the first valve member 22 with a gap S1 spaced apart, and is provided so as to be displaceable on the first valve member 22 side and in close contact with the first valve member 22. .. When the breather device 10 is submerged or water enters the cap 18, the intake valve 36 moves to the first valve member 22 side due to water pressure (for example, head pressure), and the through hole 24 is opened. Since it is closed, it is possible to provide a gap S1 so as to reduce the intrusion of water or the like into the case 12.

As described above, according to the breather device 10 of the present embodiment, the first valve member 22 is formed with a through hole 24 that communicates with the communication hole 20, and the second valve member 32 is a case of the first valve member 22. An intake valve 36 that functions as a displaceable intake valve portion on the first valve member 22 side with a gap S1 separated on the outer space E2 side is integrally provided, and the intake valve 36 has a differential pressure Ps1 (=) at the time of intake. The through hole 24 is closed by being displaced toward the first valve member 22 until the gap S1 disappears due to the air intake speed Vi by Po-Pi). Therefore, in the breather device 10 capable of intake and exhaust, the intake can be stopped when a sudden intake occurs such that the gap S1 disappears.

Further, according to the breather device 10 of the present embodiment, the intake hole 34 is formed in the second valve member 32, and the second valve member 32 can displace the intake valve 36 toward the first valve member 22 side. The intake valve connecting portion 38 connected to the inner circumference of the intake hole 34 is integrally provided, and the intake valve 36 is provided inside the intake hole 34 and is larger than the through hole 24. Therefore, the through hole 24 can be closed by the intake valve 36 with a simple configuration.

Further, according to the breather device 10 of the present embodiment, when the differential pressure Ps1 (= Po-Pi) is small and the intake speed Vi of the air passing through the gap S1 is lower than the predetermined value Ti, the intake valve 36 is a through hole. Although the 24 is not blocked, the intake valve 36 closes the through hole 24 when the differential pressure Ps1 is large and the intake speed Vi of the air passing through the gap S1 is equal to or higher than the predetermined value Ti. Therefore, when the intake speed Vi is relatively slow, intake is possible, and when the intake speed Vi is relatively high, intake is not possible.

Subsequently, another embodiment of the present invention will be described in detail with reference to the drawings. In the following description, parts common to each other in the examples are designated by the same reference numerals and the description thereof will be omitted.

FIG. 9 is a view showing a cross section of the breather device 110 of another embodiment of the present invention, and is a view corresponding to FIG. The breather device 110 of this embodiment is not provided with the coil spring 28. In the breather device 110, the second valve member 32, the first spacer 26, the first valve member 22, the second spacer 56, and the third valve member 42 are arranged in this order on the opening edge 20a inside the cap 18, and they are overlapped with each other. A cylindrical spacer 58 that functions as a holding means for holding the cap 18 and the third valve member 42 is interposed between the cap 18 and the third valve member 42.

FIG. 10 is a plan view of the third valve member 42 viewed from the case outer space E2 side in the central axis C1 direction, and FIG. 11 is a plan view of the second spacer 56 viewed from the case outer space E2 side in the central axis C1 direction. Is. Further, FIG. 12 is a perspective view showing the cylindrical spacer 58. The third valve member 42 is, for example, a disk-shaped member made of synthetic resin, rubber, or the like, which has lower rigidity and is relatively more flexible than the first valve member 22.

As shown in FIG. 10, the third valve member 42 is formed with a C-shaped exhaust hole 44 having a diameter larger than that of the through hole 24. The C-shaped exhaust hole 44 penetrates the third valve member 42 in the central axis C1 direction (thickness direction). An exhaust valve 46, which is formed to have a diameter larger than that of the through hole 24 and opens and closes the through hole 24, is provided on the inner circumference of the exhaust hole 44. Further, the third valve member 42 is integrally provided with an exhaust valve connecting portion 48 for connecting the exhaust valve child 46 and the outer peripheral edge of the third valve member 42. The exhaust valve connecting portion 48 is positioned on the inner circumference of the exhaust hole 44 so that the exhaust valve child 46 can be displaced toward the first valve member 22 and can be brought into close contact with the first valve member 22. That is, an exhaust hole 44 is formed in the third valve member 42, and the third valve member 42 connects the exhaust valve member 46 to the inner circumference of the exhaust hole 44 so as to be displaceable toward the first valve member 22. It has a portion 48 integrally.

As shown in FIG. 11, a second spacer hole 56a larger than the exhaust valve 46 is provided between the first valve member 22 and the third valve member 42 in a disk shape, that is, the first spacer 26. A similar annular second spacer 56 is sandwiched. As a result, the exhaust valve 46 of the third valve member 42 is provided from the first valve member 22 on the case inner space E1 side with a predetermined gap S2.

The cylindrical spacer 58 holds the first valve member 22 in a state of being seated on the opening edge 20a. As shown in FIG. 12, the cylindrical spacer 58 is provided with a plurality of ventilation holes 58a on the side wall for intake and exhaust. Further, although not shown, a gap for drainage is provided in the lower part of the cylindrical spacer, or a notch for drainage is provided in the second valve member 32 or the like so that water does not endure in the cap 18 when flooded. It is drained to the outer space E2 of the case.

Exhaust is performed when the air pressure Pi in the case inner space E1 becomes higher than the air pressure Po in the case outer space E2. Specifically, the air in the case inner space E1 passes through the exhaust hole 44 of the third valve member 42, passes through the gap S2 between the exhaust valve member 46 and the first valve member 22, and further passes through the first valve member 22. It passes through the through hole 24 of the above, passes through the gap S1, passes through the intake hole 34 of the second valve member 32, and goes out to the case outer space E2. In the gap S2, the differential pressure Ps2 (= Pi-Po) between the air pressure Pi in the case inner space E1 and the air pressure Po in the case outer space E2 becomes large, and the exhaust speed Vo of the air passing through the gap S2 becomes a predetermined value To or more. In this case, the exhaust valve child 46 is provided so as to move toward the first valve member 22 and come into close contact with the first valve member 22 to close the through hole 24.

Therefore, in the breather device 110, when the exhaust speed Vo of the air passing through the gap S2 at the time of exhaust is equal to or higher than the predetermined value To, the exhaust valve 46 moves to the first valve member 22 side to close the through hole 24. Exhaust stops. Further, when the exhaust speed Vo of the air passing through the gap S2 at the time of exhaust is lower than the predetermined value To, the gap S2 is not closed and the through hole 24 is not closed, so that the exhaust continues. At the time of intake, when the intake speed Vi of the air passing through the gap S1 is equal to or higher than the predetermined value Ti as in the first embodiment, the intake valve 36 moves to the first valve member 22 side and closes the through hole 24. This stops the intake.

As described above, according to the breather device 110 of the present embodiment, the second valve member 32, the first valve member 22, and the third valve member 42 are arranged in this order on the opening edge 20a in the cap 18, and the third valve member 42 is arranged in this order. The valve member 42 is integrally provided with an exhaust valve 46 that functions as an exhaust valve portion that can be displaced toward the first valve member 22 with a gap S2 on the case inner space E1 side of the first valve member 22. The child 46 closes the through hole 24 by being displaced toward the first valve member 22 by eliminating the gap S2 due to the exhaust speed Vo due to the differential pressure Ps2 (= Pi-Po) at the time of exhaust. Therefore, the vehicle breather device 110 capable of intake and exhaust has the same effect as that of the first embodiment, and may stop the exhaust when a sudden exhaust such that the gap S2 disappears occurs. can. Further, since the coil spring 28 is not provided, the dimension of the breather device 110 in the central axis C1 direction can be shortened. Further, when the breather device 10 is laid on its side, the outflow of oil or the like in the case 12 can be reduced by the exhaust valve 46 closing the through hole 24.

FIG. 13 is a view showing a cross section of the breather device 210 according to still another embodiment of the present invention. FIG. 14 is a plan view of the first valve member 222 viewed from the case outer space E2 in the central axis C1 direction, and FIG. 15 is a plan view of the second valve member 232 viewed from the case outer space E2 in the central axis C1 direction. be.

As shown in FIG. 14, the first valve member 222 has a through hole 224 on the outer peripheral side, and the through hole 224 communicates with the communication hole 20. The second valve member 232 is a sheet-like member whose central portion bulges toward the outer space E2 side of the case, that is, a so-called diaphragm, and the central portion functions as an intake valve portion 236. Further, the second valve member 232 has an intake hole 234 at a position that does not overlap with the through hole 224 in the central axis C1 direction, that is, at the center as shown in FIG. Since the intake valve portion 236 swells toward the case outer space E2 in the normal state, that is, even when there is no difference between the air pressure Pi in the case inner space E1 and the air pressure Po in the case outer space E2, the intake valve portion 236 and the first valve A predetermined gap S1 is provided between the member 22 and the member 22.

FIG. 16 is a cross-sectional view of the breather device 210, showing a state in which the intake valve portion 236 of the second valve member 232 closes the through hole 24 when the intake speed Vi is equal to or higher than a predetermined value Ti. In the gap S1 between the intake valve portion 236 and the first valve member 22, when the intake speed Vi of the air passing through the gap S1 is equal to or higher than the predetermined value Ti, the intake valve portion 236 of the second valve member 232 is the first. It is provided so as to move to the valve member 222 side and come into close contact with the first valve member 222 to close the through hole 24.

As described above, according to the breather device 210 of the present embodiment, the second valve member 232 has an intake hole 234 at a position not overlapping with the through hole 224 of the first valve member 222, and the second valve member 232 has an intake hole 234. The intake valve portion 236 that functions as the provided intake valve portion is a sheet-like member whose center is bulged toward the case outer space E2. Therefore, it has the same effect as that of the first embodiment, and the through hole 224 of the first valve member 222 can be closed by the intake valve portion 236 with a simple configuration. Further, since the intake valve portion 236 of the second valve member 232 of the present embodiment can have a large pressure receiving area with respect to the intake valve portion 36 of the above-described embodiment, the through hole 224 can be formed even at a relatively low water pressure or intake speed Vi. It can be closed by the intake valve portion 236.

FIG. 17 is a view showing a cross section of a breather device 310 according to still another embodiment of the present invention. The breather device 310 includes a first valve member 22, a first coil spring 328, a second valve member 332, and a second coil spring 360. The first valve member 22 is arranged so as to be seated on the opening edge 20a inside the cap 18. The first coil spring 328 is inserted between the cap 18 and the first valve member 22 in a preloaded state to urge the first valve member 22 toward the opening edge 20a. The second valve member 332 integrally includes an intake valve portion 332a, an intake valve support portion 332b, a bottom portion 332c, and an annular exhaust valve portion 332d.

The case inner space E1 side of the second valve member 332 is a cylindrical portion having a bottom portion 332c and is arranged in the communication hole 20. A disk-shaped intake valve portion 332a is provided on the case outer space E2 side of the second valve member 332, and is arranged outside the communication hole 20. At the center of the outside of the bottom portion 332c, an intake valve support portion 332b is provided so as to project toward the case outer space E2 side and connect the center of the disc-shaped intake valve portion 332a and the center of the bottom portion 332c. An annular exhaust valve portion 332d is projected from the bottom portion 332c so as to surround the intake valve support portion 332b.

One end of the second coil spring 360 is housed inside the bottom portion 332c. The other end of the second coil spring 360 is supported by a step portion 14c provided in the communication hole 20 of the breather main body 14. The second coil spring 360 is inserted between the second valve member 332 and the breather main body 14 in a preloaded state in the communication hole 20, and urges the second valve member 332 toward the first valve member 22. .. The annular exhaust valve portion 350d is in contact with the first valve member 22 by urging the second valve member 332 by the second coil spring 360.

The intake valve support portion 332b is longer than the annular exhaust valve portion 332d in the central axis C1 direction, and the outer diameter is smaller than the inner diameter of the through hole 24. The intake valve portion 332a of the second valve member 332 has a disk shape and is arranged on the case outer space E2 side of the first valve member 22. The intake valve portion 332a is connected to the bottom portion 332c by an intake valve support portion 332b that passes through the through hole 24 and projects toward the case outer space E2 side of the first valve member 22. The intake valve portion 332a is provided on the case outer space E2 side of the first valve member 22 so that a predetermined gap S1 is separated from the first valve member 22.

The urging force of the first coil spring 328 is larger than the urging force of the second coil spring 360. Therefore, in the normal state, that is, when there is no difference between the air pressure Pi in the case inner space E1 and the air pressure Po in the case outer space E2, the communication hole 20 is attached to the first coil spring 328 as shown in FIG. The through hole 24 of the first valve member 22 is closed by the urged first valve member 22, and the through hole 24 of the first valve member 22 is closed by the annular exhaust valve portion 332d of the second valve member 332 urged by the second coil spring 360. , The breather device 310 is closed.

FIG. 18 is a cross-sectional view taken through the central axis C1 of the breather device 310 at the time of exhaust. When the atmospheric pressure Pi of the case inner space E1 becomes higher than the atmospheric pressure Po of the case outer space E2, the force due to the differential pressure Ps2 (= Pi-Po) between the atmospheric pressure Pi of the case inner space E1 and the atmospheric pressure Po of the case outer space E2 becomes the first. The coil spring 328 receives. The first coil spring 328 also receives the urging force of the second coil spring 360. When the differential pressure Ps2 becomes larger than the pressure value P1 which is the pressure at which the force received by the first coil spring 328 by the urging force and the differential pressure Ps2 by the second coil spring 360 and the urging force of the first coil spring 328 are balanced, The first coil spring 328 contracts, and the first valve member 22 and the second valve member 332 move to the case outer space E2 side. As a result, the first valve member 22 is separated from the opening edge 20a, the case inner space E1 communicates with the case outer space E2 through the communication hole 20, and exhaust is performed as shown by the broken line arrow in FIG.

FIG. 19 is a cross-sectional view taken through the central axis C1 of the breather device 310 at the time of intake. When the atmospheric pressure Pi of the case inner space E1 becomes lower than the atmospheric pressure Po of the case outer space E2, the force due to the differential pressure Ps1 (= Po-Pi) between the atmospheric pressure Po of the case outer space E2 and the atmospheric pressure Pi of the case inner space E1 becomes second. The coil spring 360 receives. When the differential pressure Ps1 becomes larger than the pressure value P2, which is the pressure at which the force received by the second coil spring 360 by the differential pressure Ps1 and the urging force of the second coil spring 360 are balanced, the second coil spring 360 contracts and the second The valve member 332 moves to the case inner space E1 side. As a result, the annular exhaust valve portion 332d is separated from the first valve member 22, the case outer space E2 communicates with the case inner space E1 through the communication hole 20, and intake air is performed as shown by the broken line arrow in FIG. ..

FIG. 20 is a cross-sectional view taken through the central axis C1 of the breather device 10 and shows a state in which the intake valve portion 332a closes the through hole 24 when the intake speed Vi is equal to or higher than a predetermined value Ti. At the time of intake, in the gap S1, when the intake speed Vi of the air passing through the gap S1 is equal to or higher than the predetermined value Ti, the second valve member 332 moves to the first valve member 22 side and takes in air as shown in FIG. The valve portion 332a is provided so as to be in close contact with the first valve member 22 and close the through hole 24.

As described above, according to the breather device 310 of the present embodiment, the first valve member 22 is formed with a through hole 24 communicating with the communication hole 20, and the second valve member 332 is formed with the first valve member 22. An intake valve portion 332a that can be displaced to the first valve member 22 side with a gap on the case outer space E2 side is integrally provided, and the intake valve portion 332a has a gap due to the differential pressure Ps1 (= Po-Pi) at the time of intake. The through hole 24 is closed by being displaced toward the first valve member 22 until S1 disappears. Therefore, the breather device 310 for a vehicle, which has the same effect as that of the first embodiment and is capable of intake and exhaust, can stop the intake when a sudden intake occurs such that the gap S1 disappears. can.

Although the examples of the present invention have been described in detail with reference to the drawings, the present invention also applies to other aspects.

For example, in the above-mentioned first to fourth embodiments, the breather devices 10, 110, and 210 are provided in the case 12 that houses the electric motor, but are provided in the transmission case, the differential case, the engine case, and the like. May be good.

Further, in the above-described first and second embodiments, the predetermined value Ti of the intake air speed Vi that closes the gap S1 is a change in the size of the gap S1, the shape and material of the intake valve connecting portion 38, the shape of the through hole 24, and the like. However, for example, as shown in FIGS. 21 and 22, the distance between the through hole 24 and the intake hole 34 may be changed. 21 and 22 are views showing other examples of the first valve member 22 and the second valve member 32, and are cross-sectional views thereof.

The first valve member 22 and the second valve member 32 in FIG. 21 have a relatively short distance L1 between the through hole 24 and the intake hole 34. Therefore, in order for the flow path resistance to be small and the gap S1 to be closed, it is necessary to have a relatively high intake speed Vi. Therefore, although air can easily pass through, water and the like can easily enter. Since the distance L2 between the through hole 24 and the intake hole 34 is relatively long in the first valve member 22 and the second valve member 32 in FIG. 22, the flow path resistance is large and the pressure receiving area of the intake valve 36 is also large. Therefore, the gap S1 is closed at a relatively low intake speed Vi. Further, the surface tension makes it difficult for water to pass through, and the water that has entered the gap S1 acts as a packing for the liquid, so that negative pressure easily acts on the intake valve 36. The distance between the exhaust hole 44 and the through hole 24 of the second embodiment, the distance between the intake hole 234 and the through hole 224 of the third embodiment, the outer end of the second valve member of the fourth embodiment and the through hole 24. The same applies to the distance between and.

Further, in the above-described first to fourth embodiments, the predetermined value Ti of the intake speed Vi in which the gap S1 is closed may be adjusted by changing the shape of the second valve members 32, 232, and 332. For example, the intake valve portion 236 of the third embodiment may be concave or convex so that the through hole 224 is difficult to close or easily closed. Further, for example, the second valve member 32 of the first embodiment may have a shape as shown in FIGS. 23, 24, and 25. When the second valve member 32 has the shape shown in FIG. 25, the pressure receiving area of the intake valve 36 becomes wide, so that the differential pressure Ps1 can be uniformly received and the displacement of the intake valve 36 can be made uniform. can. The same applies to the shape of the third valve member 42 of the second embodiment.

Further, in the above-mentioned first and second embodiments, the second valve member 32 is provided with a protrusion 36a for providing a narrower gap S1a in the gap S1, but it is not necessary. Further, the third valve member 42 of the third embodiment, the second valve member 232 of the third embodiment, and the second valve member 332 of the fourth embodiment are also provided with protrusions for providing a narrower gap S1a. May be good. Further, the first valve members 22 and 222 of Examples 1 to 4 may be provided with a protrusion for providing a narrower gap S1a in the gap S1.

It should be noted that the above is only one embodiment, and the present invention can be implemented in a mode in which various changes and improvements are made based on the knowledge of those skilled in the art.

10, 110, 210, 310: Breather device (Vehicle breather device)
14: Breather body 18: Cap 20: Communication hole 20a: Opening edge 22, 222: First valve member 24, 224: Through hole 32, 232, 332: Second valve member 36: Intake valve child (intake valve portion)
46: Exhaust valve (exhaust valve)
236, 332a: Intake valve portion 332d: Circular exhaust valve portion (exhaust valve portion)
E1: Case inner space E2: Case outer space Ps1: Differential pressure during intake Ps2: Differential pressure during exhaust S1: Gap

Claims (1)

A vehicle breather device that can take in and out air between the space inside the case and the space outside the case.
A breather body having a communication hole that communicates with the space inside the case,
A cap that covers the opening edge of the communication hole on the outer space side of the case of the breather body,
In the cap, a first valve member and a second valve member arranged in order on the opening edge are provided.
The first valve member is formed with a through hole that communicates with the communication hole.
The second valve member is integrally provided with an intake valve portion that can be displaced to the first valve member side with a gap on the case outer space side of the first valve member.
A vehicle breather device characterized in that the intake valve portion is displaced toward the first valve member side by a differential pressure during intake until the gap disappears, thereby closing the through hole.

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