JP2021095936A - Vehicle breather device - Google Patents

Abstract

To provide a breather device which enables air suctioning and air exhaustion and uses a relatively small number of components.SOLUTION: A breather device 10 allows an internal space E1 and an external space E2 of a case 12 to communicate with each other and includes: a breather body 14 formed with a communication hole 20 communicating with the internal space E1; a first seat 22 which is seated on an external space E2 side opening edge 20a of the communication hole 20 formed at the breather body 14, and is formed with a first through hole 32 communicating with the communication hole 20; a second seat 24 which is provided overlapping with the external space E2 side of the first seat 22, is formed with a second through hole 34 which communicates with the external space E2 and does not overlap with the first through hole 32; and a spring 26 which biases the first seat 22 to the opening edge 20a through the second seat 24 to shield the communication hole 20 from the external space E2. An elastic modulus of the first seat 22 is larger than an elastic modulus of the second seat 24.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 such as a transmission case and a transaxle case, which is 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 (10) of Patent Document 1, the exhaust valve (31) and the intake valve are arranged coaxially, and further, a spring that urges the exhaust valve toward the internal space side of the case body to adjust the exhaust ( There is a problem that two springs, 36) and a spring (26) that urges the intake valve to the external space side of the case body to adjust the intake air, are provided, and the number of parts is large.

The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide a vehicle breather device capable of both intake and exhaust and having a relatively small number of parts. ..

The gist of the present invention is a vehicle breather device that communicates with the internal space and the external space of the case, and is formed on the breather main body having a communication hole communicating with the internal space and the breather main body. The first sheet, which is seated on the opening edge of the communication hole on the external space side and has a first through hole that communicates with the communication hole, is provided so as to be overlapped on the external space side of the first sheet. The second sheet is formed with a second through hole that communicates with the external space and does not overlap with the first through hole, and the first sheet is urged to the opening edge via the second sheet. The member is provided, and the elastic coefficient of the first sheet is larger than the elastic coefficient of the second sheet.

According to the vehicle breather device of the present invention, the breather main body having a communication hole communicating with the internal space and the opening edge of the communication hole formed in the breather main body on the external space side are seated. , The first sheet in which the first through hole communicating with the communication hole is formed is provided so as to be overlapped with the external space side of the first sheet, and communicates with the external space and does not overlap with the first through hole. A second sheet in which a second through hole is formed and an urging member that urges the first sheet to the opening edge via the second sheet are provided, and the elastic modulus of the first sheet is the above. It is larger than the elastic modulus of the second sheet. In this way, when the pressure in the internal space is high, at least the second sheet moves toward the external space side against the urging force of the urging member, so that the communication hole communicates with the external space and exhaust is allowed. When the pressure in the internal space is low, the first sheet having a large elastic modulus is elastically deformed more than the second sheet, so that the first through hole and the second through hole communicate with each other to allow intake. As a result, the first seat functions as both an intake valve for intake and an urging member for adjusting intake, so that the number of parts of the vehicle breather device can be relatively reduced.

It is sectional drawing at the time of valve closing in the breather device for a vehicle which is one Example of this invention. It is a top view of the 1st sheet provided in the vehicle breather device of FIG. It is a top view of the 2nd seat provided in the vehicle breather device of FIG. It is sectional drawing at the time of exhaust in the breather device for a vehicle of FIG. It is sectional drawing at the time of intake in the breather device for a vehicle of FIG. It is a figure which shows an example of the fixing method of the 1st seat and the 2nd seat provided in the breather device for a vehicle of FIG. It is a figure which shows another example of the fixing method of the 1st seat and the 2nd seat provided in the breather device for a vehicle of FIG. It is a figure which shows still another example of the fixing method of the 1st seat and the 2nd seat provided in the breather device for a vehicle of FIG. It is a figure which shows still another example of the fixing method of the 1st seat and the 2nd seat provided in the breather device for a vehicle of FIG. It is a cross-sectional view at the time of exhaust in the vehicle breather device of another embodiment of this invention, and is the figure corresponding to FIG. FIG. 10 is a cross-sectional view of the vehicle breather device of FIG. 10 at the time of intake, and is a view corresponding to FIG. It is a figure which shows an example of the 1st seat and the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows another example of the 1st seat and the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat and the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat and the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 2nd seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat provided in the vehicle breather apparatus of FIG. 1 and FIG. It is a figure which shows still another example of the 1st seat provided in the vehicle breather apparatus of FIG. 1 and 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 when the valve is closed, and is a cross-sectional view passing through the central axis CL of the breather device 10. The breather device 10 is provided, for example, in a case 12 including an electric motor of a vehicle (not shown). The internal space E1 of the case 12 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 internal space E1 and the external space E2 of the case 12 are communicated with each other by, for example, a breather device 10 provided in 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 CL, and a screw portion 14a to be fastened to the case 12 is formed at one end in the central axis CL direction, and a flange is formed at the other end. Part 14b is formed. The space inside the substantially cylindrical breather body 14 is a communication hole 20 that penetrates in the CL direction of the central axis and communicates with the internal space E1 of the case 12. The cap 18 has a bottomed tubular shape, and the end portion on the opening side thereof is a squeezing portion 18a partially projecting on the inner peripheral side. The communication hole 20 formed at the end of the breather body 14 on the external space E2 side by engaging the throttle portion 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 cap 18 is fitted to the breather body 14 so as to cover the opening edge 20a on the outer space E2 side of the above.

The breather device 10 has a first sheet 22 seated on the inside of the cap 18 at the opening edge 20a of the communication hole 20 of the breather main body 14, and a second sheet 24 overlapped on the external space E2 side of the first sheet 22. And a spring 26 that is inserted between the cap 18 and the second sheet 24 in a preloaded state to urge the first sheet 22 and the second sheet 24 toward the opening edge 20a. FIG. 2 is a plan view of the first sheet 22 viewed from the external space E2 side in the central axis CL direction, and FIG. 3 is a plan view of the second sheet 24 viewed from the external space E2 side in the central axis CL direction. The first sheet 22 is a low-rigidity disk-shaped member made of, for example, an elastomer such as relatively soft rubber, and the second sheet 24 is a disk-shaped member made of, for example, relatively hard rubber or plastic. Is. The elastic modulus of the first sheet 22 is made larger than the elastic modulus of the second sheet 24, so that the elastic deformation of the first sheet 22 is relatively easy with respect to the elastic deformation of the second sheet 24.

As shown in FIG. 2, the first sheet 22 has one first through hole 32 penetrating in the central axis CL direction (thickness direction) in the center. Further, as shown in FIG. 3, the second sheet 24 has six second through holes 34 penetrating in the central axis CL direction at positions away from the center centering on the central axis CL. The second through hole 34 is formed at a position that does not overlap with the first through hole 32 in the central axis CL direction when the first sheet 22 and the second sheet 24 are overlapped inside the cap 18. The shape of the second through hole 34 shown in FIG. 3 has a simple drilling process and is easy to manufacture, and the area of the hole can be widened and the accuracy of the area can be easily maintained.

The first sheet 22 is, for example, an elastic body having flexibility capable of following the shape of the opening edge 20a of the communication hole 20 and the second sheet 24, and the first sheet 22 is passed through the second sheet 24 by the spring 26. By being urged, as shown in FIG. 1, the space between the first sheet 22 and the opening edge 20a and the space between the first sheet 22 and the second sheet 24 are blocked, and the intrusion of foreign matter such as water is prevented. Will be done.

FIG. 4 is a cross-sectional view including the central axis CL of the breather device 10 at the time of valve opening, and is a cross-sectional view at the time of exhaust. As shown in FIG. 4, the first through hole 32 of the first sheet 22 is closed by the second sheet 24 having a lower elastic modulus than that of the first sheet 22. When the atmospheric pressure Pi of the internal space E1 is larger than the atmospheric pressure Po of the external space E2, the differential pressure Ps (= Pi-Po) between the internal space E1 and the external space E2 is the side surface of the internal space of the first sheet 22 as shown by the white arrow. It takes 22a. Further, the differential pressure Ps is directly applied to the internal space side surface 24a of the second sheet 24 that closes the first through hole 32, but the deformation amount of the second sheet 24 is larger than the deformation amount of the first sheet 22 in the central axis CL direction. Due to its small size, the first through hole 32 of the first sheet 22 remains closed and no gap is formed between the first sheet 22 and the second sheet 24. Therefore, the spring 26 receives the force due to the differential pressure Ps applied to the first sheet 22 and the second sheet 24.

When the differential pressure Ps becomes larger than the pressure value P1 which is the pressure at which the force received by the spring 26 and the urging force of the spring 26 are balanced by the differential pressure Ps, the spring 26 contracts and the first sheet 22 and the second sheet 24 are externally formed. Move to the space E2 side. At this time, as shown in FIG. 4, a gap is formed not between the first sheet 22 and the second sheet 24 but between the first sheet 22 and the opening edge 20a of the communication hole 20. As a result, the internal space E1 communicates with the external space E2 through the communication hole 20, and exhaust is performed as shown by the broken line arrow in FIG. The pressure value P1 can be predetermined, for example, by changing the elastic modulus of the spring 26.

FIG. 5 is a cross-sectional view including the central axis CL direction of the breather device 10 at the time of valve opening, and is a cross-sectional view at the time of intake. When the atmospheric pressure Pi of the internal space E1 becomes smaller than the atmospheric pressure Po of the external space E2, a differential pressure Ps (= Pi-Po) is applied to the external space side surface 24b of the second sheet 24 as shown by a white arrow, but the second sheet 24 is affected. Since the second through hole 34 is open, the differential pressure Ps is directly applied to the external space side surface 22b of the first sheet 22 that closes the second through hole 34. Since the elastic modulus of the first sheet 22 is larger than the elastic modulus of the second sheet 24, there is a difference in the amount of deformation in the CL direction of the central axis, and as shown in FIG. 5, the first sheet 22 and the second sheet 24 There is a gap between them.

When the differential pressure Ps becomes equal to or less than the pressure value P2 at which the first through hole 32 and the second through hole 34 start communicating with each other due to the gap between the first sheet 22 and the second sheet 24, the internal space E1 and the external space E2 Intake is performed in communication with and. The pressure value P2 can be predetermined, for example, by changing the elastic modulus of the first sheet 22.

Returning to FIG. 1, when the differential pressure Ps is larger than the pressure value P2 and is equal to or less than the pressure value P1, that is, when P2 <Ps (= Pi-Po) ≤ P1, the first sheet 22 presses the second sheet 24. By being urged by the spring 26 via the spring 26, the space between the first sheet 22 and the opening edge 20a and the space between the first sheet 22 and the second sheet 24 are sealed. The spring 26 is combined with a cap 18 that compresses the spring 26 to urge the first sheet 22 to the opening edge 20a via the second sheet 24 to block the communication hole 20 and the external space E2. It functions as a member.

In the conventional breather device, the prevention of foreign matter from entering from the outside and the exhaust when the pressure in the internal space rises are emphasized, and the intake performance when the internal space becomes negative pressure is not emphasized. For this reason, there is a possibility that the inside of the case of the vehicle motor becomes too 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. It was. Further, when the spring for adjusting the exhaust and the spring for adjusting the intake are provided coaxially as in the breather device of Patent Document 1, there is a state in which the urging forces of the two springs antagonize each other. There is a problem that the degree of freedom of exhaust characteristics is low, the difficulty of assembly is high, and the performance varies due to variations in component dimensions and changes in sliding conditions.

However, the breather device 10 of the present embodiment satisfies the three functions of foreign matter intrusion prevention, exhaust, and intake even if the installation position is low, and can prevent internal oil leakage when the vehicle rolls over. .. Further, since the structure is simple, the manufacturing cost is low, the size can be made almost the same as the conventional one, and the variation in the performance due to the variation in the component size and the change in the sliding state can be reduced.

Here, in the present embodiment, in order to make the pressure value P1 at the time of exhaust and the pressure value P2 of the intake pressure more as intended, the first sheet 22 and the second sheet 24 are not displaced in the radial direction. They may be fixed to each other. 6 to 9 are cross-sectional views including the central axis CL direction showing an example of the fixing method of the first sheet 22 and the second sheet 24, respectively. The fixing methods of FIGS. 6 to 9 may be used separately or in combination.

In FIG. 6, the second sheet 24 further has an annular protrusion 24c whose radial outer side of the side surface 24a of the internal space protrudes toward the internal space E1. The first sheet 22 is fitted inside the annular protrusion 24c, and the first sheet 22 and the second sheet 24 are fixed to each other in the radial direction. The annular protrusion 24c may have an intermittent annular shape.

In FIG. 7, the first sheet 22 further has a protrusion 22c protruding outward in the radial direction of the side surface 22b of the outer space, and the tip of the protrusion 22c further protrudes outward in the radial direction to form the second sheet. 24 is sandwiched in the thickness direction (central axis CL direction).

In FIG. 8, the first sheet 22 further has a V-shaped notch 22d on the radial outer side of the external space side surface 22b, and the second sheet 24 further has a protrusion 24d fitted into the internal space side surface 24a. .. The first sheet 22 and the second sheet 24 are fixed to each other by the fitting protrusion 24d biting into the V-shaped notch 22d.

In FIG. 9, the first sheet 22 is the first sheet by further applying the adhesive 40 to the radial outer side of the outer space side surface 22b and adhering to the radial outer side of the outer space side surface 24b in the second sheet 24. The 22 and the second sheet 24 are fixed to each other.

In FIG. 6, the first sheet 22 and the second sheet 24 are fixed to each other so as not to move in the radial direction, and in FIG. 7, the first sheet 22 and the second sheet 24 become immovable to each other in the radial direction and the central axis CL direction. In FIGS. 8 and 9, the first sheet 22 and the second sheet 24 are fixed to each other so as not to move in the radial direction and the central axis CL direction, and are fixed to each other so as not to rotate around the central axis CL. There is. By doing so, the variation in the pressure value P1 and the pressure value P2 can be reduced, and stable valve opening characteristics can be obtained.

As described above, according to the breather device (vehicle breather device) 10 of the present embodiment, the breather device 10 that communicates the internal space E1 and the external space E2 of the case 12 and is a communication hole that communicates with the internal space E1. The breather main body 14 on which the 20 was formed and the opening edge 20a on the outer space E2 side of the communication hole 20 formed in the breather main body 14 were seated to form a first through hole 32 communicating with the communication hole 20. The first sheet 22 and the second sheet 24 are provided so as to be overlapped on the outer space E2 side of the first sheet 22 and have a second through hole 34 that communicates with the outer space E2 and does not overlap with the first through hole 32. A spring (urging member) 26 for urging the first sheet 22 to the opening edge 20a via the second sheet 24 is provided, and the elasticity of the first sheet 22 is higher than that of the second sheet 24. large.

In this way, the elastic modulus of the first sheet 22 is larger than the elastic modulus of the second sheet 24, that is, the first sheet 22 with respect to the differential pressure Ps (= Pi-Po) between the internal space E1 and the external space E2. The amount of deformation of the second sheet 24 is larger than the amount of deformation of the second sheet 24. Therefore, in a normal case, that is, when the differential pressure Ps between the internal space E1 and the external space E2 is larger than the predetermined pressure value P2 and equal to or less than the predetermined pressure value P1 (when P2 <Ps ≦ P1). The first through hole 32 is closed by the internal space side surface 24a of the second sheet 24, and the flow of gas between the internal space E1 and the external space E2 is blocked. Further, when the pressure in the internal space is high, that is, when the differential pressure Ps is larger than the pressure value P1 (when Ps> P1), at least the second sheet 24 is on the external space E2 side against the urging force of the spring 26. By moving to, the communication hole 20 and the external space E2 communicate with each other. Further, when the pressure in the internal space is high, that is, when the differential pressure Ps is the pressure value P2 or less (when Ps ≦ P2), the first sheet 22 is elastically deformed toward the internal space E1 side more than the second sheet 24. By doing so, the first through hole 32 and the second through hole 34 communicate with each other.

Therefore, when the pressure in the internal space E1 is high, at least the second seat 24 moves against the urging force of the spring 26 to allow exhaust, and when the pressure in the internal space E1 is low, the elastic modulus is large. The seat 22 is elastically deformed more than the second seat 24, so that intake air is allowed. Therefore, since the first seat 22 functions as both an intake valve for intake and an urging member for adjusting intake during intake, the number of parts of the vehicle breather device can be relatively reduced.

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. 10 is a diagram showing a cross section of the breather device 110 of another embodiment of the present invention at the time of exhaust, and is a diagram corresponding to FIG. The first sheet 122 of the breather device 110 is provided with an annular grip portion 122c for gripping the flange portion 14b on the outer peripheral side, and is fixed to the flange portion 14b of the breather main body 14 so as not to come off from the breather main body 14. The cap 18 of the breather device 110 has a throttle portion 18a whose opening side is partially projected toward the inner peripheral side, and is further on the outer peripheral side of the flange portion 14b of the breather main body 14 so as not to come off from the breather main body 14. It is fitted to the outer periphery of the first sheet 122 located.

The first sheet 122 shown in FIG. 10 has one first through hole 32 like the first sheet 22 of FIG. Further, the second sheet 124 has six second through holes 34 like the second sheet 24 of FIG. The first through hole 32 of the first sheet 122 is closed by the second sheet 124, which has a lower elastic modulus than that of the first sheet 122. Therefore, when the air pressure Pi in the internal space E1 becomes larger than the air pressure Po in the external space E2, pressure is also applied to the second sheet 124, and the pressure applied to the second sheet 124 is received by the spring 26. When the differential pressure Ps (= Pi-Po) between the internal space E1 and the external space E2 becomes larger than the pressure value P1 which is the pressure at which the force received by the spring 26 and the urging force of the spring are balanced, the spring 26 contracts and the first The sheet 122 and the second sheet 124 move to the external space E2 side. At this time, as shown in FIG. 10, a gap is formed between the first sheet 122 and the second sheet 124, not between the opening edge 20a of the communication hole 20 and the first sheet 122. Therefore, the internal space E1 communicates with the external space E2 through the first through hole 32, and exhaust is performed as shown by the broken line arrow in FIG.

FIG. 11 is a cross-sectional view of the breather device 110 of FIG. 10 at the time of intake, and is a view corresponding to FIG. When the air pressure Pi in the internal space E1 becomes smaller than the air pressure Po in the external space E2, pressure is applied to the second sheet 124, but since the second sheet 124 has the second through hole 34, the second through hole 34 is formed. The differential pressure Ps (= Pi-Po) between the internal space E1 and the external space E2 is also directly applied to the external space side surface 122b of the first sheet 122 to be closed. Since the elastic modulus of the first sheet 122 is larger than the elastic modulus of the second sheet 124, as shown in FIG. 11, a gap is generated between the first sheet 122 and the second sheet 124 due to the difference in the amount of deformation.

The differential pressure Ps between the internal space E1 and the external space E2 becomes equal to or less than the pressure value P2 at which the first through hole 32 and the second through hole 34 start to communicate with each other due to the gap between the first sheet 122 and the second sheet 124. Then, the internal space E1 and the external space E2 are communicated with each other to perform intake.

Further, when the differential pressure Ps (= Pi-Po) between the internal space E1 and the external space E2 is larger than the pressure value P2 and equal to or less than the pressure value P1, that is, when P2 <Ps (= Pi-Po) ≤ P1. When the second sheet 124 is urged by the spring 26, the space between the first sheet 122 and the second sheet 124 is blocked, and the intrusion of foreign matter such as water is prevented. The spring 26 and the cap 18 that compresses the spring 26 function as an urging member that urges the first sheet 122 to the opening edge 20a via the second sheet 124 to block the communication hole 20 and the external space E2. doing.

According to this embodiment, the same effect as that of the first embodiment can be expected, and the gap when the first through hole 32 and the second through hole 34 communicate with each other can be lengthened, so that foreign matter such as water invades. Better against. Further, since the first sheet 122 is fitted to the breather main body 14 and the second sheet 124 is directly urged by the spring 26, there is an advantage that the first sheet 122 and the second sheet 124 are less likely to be displaced from each other. ..

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 and second embodiments, the breather devices 10 and 110 are provided in the case 12 accommodating the electric motor, but may be provided in the transmission case, the differential case, the engine case, and the like. ..

Further, in the above-mentioned Examples 1 and 2, the second sheets 24 and 124 were disk-shaped members made of hard rubber, plastic or the like, but the elastic modulus may be lower than that of the first sheets 22 and 122. It may be metal. Further, the second sheets 24 and 124 may be fixed to the end of the spring 26 so as not to rotate around the central axis CL.

Further, in the above-mentioned Examples 1 and 2, the pressure value P2 at the time of intake can be adjusted by changing the elastic modulus of the first sheets 22, 122 and the second sheets 24, 124, but the material The elastic modulus may be changed not by changing but by changing the shape or the like. For example, the elastic modulus may be changed by partially changing the thickness of the first sheets 22, 122 and the second sheets 24, 124. 12 and 13 are views showing other examples of the first sheets 22, 122 and the second sheets 24, 124, and are cross-sectional views thereof.

In the first sheet 222 and the second sheet 224 of FIG. 12, the diameters of the first through hole 32 and the second through hole 34 are relatively large, and the distance between the overlapping portions is relatively short in L1. Even if the deformation of the sheet 222 is relatively small, the first through hole 32 and the second through hole 34 communicate with each other. In the first sheet 232 and the second sheet 234 of FIG. 13, the diameters of the first through hole 32 and the second through hole 34 are relatively small, and the distance L2 of the overlapping portion between them is relatively long, so that the first sheet The first through hole 32 and the second through hole 34 do not communicate with each other unless the deformation of the 232 becomes relatively large. Further, since the first sheet 232 and the second sheet 234 can make the gap when the first through hole 32 and the second through hole 34 communicate with each other can be elongated, the liquid such as water needs to overcome the surface tension. When the differential pressure Ps (= Pi-Po) is a predetermined pressure value P3 or less, intake is possible, but communication can be cut off when water or the like infiltrates. Further, in the second embodiment, the pressure value P1 at the time of exhaust can be adjusted by changing the diameter of the first through hole 32.

Further, in the above-mentioned Examples 1 and 2, the cut 242a may be formed instead of the first through hole 32 as in the first sheet 242 shown in FIG. 14, and the shape may be opened at the time of ventilation. In this way, the shape that opens at the time of intake can be made into a shape with high reproducibility without any chance, and the predetermined pressure value P2 at the time of intake can be made a stable value, that is, a stable valve opening characteristic can be obtained. Is possible. Further, as in the first sheet 252 shown in FIG. 15, the cut 252a may be combined with the first through hole 32. If there is no first through hole 32 and only the cut 252a, the shape that opens at the time of intake may not be stable due to friction at the contact point, but in the first sheet 252 of FIG. 15, the cut 252a is the starting point of deformation. Further stable valve opening characteristics can be obtained. Further, the shape may be changed so that the cut of the first sheet 252 is changed to a crease or a groove. Further, the second seats 24 and 124 may be provided with a groove to stabilize the ventilation so that the valve opening characteristic becomes more stable.

Further, in the above-mentioned Examples 1 and 2, the first through hole 32 was provided in the center of the first sheets 22 and 122 and closed by the second sheets 24 and 124, but FIGS. 16 and 17 show. As shown in the above, the first through hole 32 and the second through hole 34 may be provided at positions shifted by a certain distance from the center. In FIG. 16, the first sheet 262 and the second sheet 264 are overlapped at positions where the first through hole 32 and the second through hole 34 are displaced by 180 degrees, and the first through hole 32 and the second through hole 34 are overlapped with each other. Since the distance is long, the absolute value of the differential pressure between the internal space E1 and the external space E2 at the start of intake can be set to a large value, that is, the pressure value P2 at the time of intake can be set to a relatively low value. In FIG. 17, the first sheet 262 and the second sheet 264 are overlapped at positions where the first through hole 32 and the second through hole 34 are displaced by 30 degrees, and the internal space E1 and the external space E2 at the start of intake air are overlapped with each other. The absolute value of the differential pressure can be a small value, that is, the pressure value P2 at the time of intake can be a relatively high value. By using the first sheet 262 and the second sheet 264, the pressure value P2 at the time of intake can be easily adjusted by changing the angle at the time of stacking. When the first sheet 262 and the second sheet 264 are used, for example, as shown in FIGS. 8 and 9, the first sheet 262 and the second sheet 264 are fixed to each other so as not to rotate around the central axis CL, or When the first seat 262 and the breather main body 14 are fitted as in the second embodiment, more stable valve opening characteristics can be obtained.

Further, in the above-mentioned Examples 1 and 2, the second sheets 24 and 124 had six second through holes 34 at positions away from the center, but different numbers and shapes, for example, FIG. 18 It may have a shape as shown in FIG. Since the second through hole 34 of the second sheet 284 of FIG. 18 is provided as large as possible, the absolute value of the differential pressure between the internal space E1 and the external space E2 at the start of intake is small, that is, at the time of intake. The pressure value P2 of can be set to a high value. Since the second through hole 34 of the second sheet 294 of FIG. 19 is provided as small as possible, the absolute value of the differential pressure between the internal space E1 and the external space E2 at the start of intake is large, that is, the pressure value. P2 can be set to a low value. Further, since the gap when the first through hole 32 and the second through hole 34 communicate with each other can be lengthened, it is possible to have a structure in which the communication can be cut off when water or the like enters, although the intake air can be taken. Unlike FIGS. 18 and 19, the second sheet 304 of FIG. 20 has the second through holes 34 evenly provided in four directions, so that the first sheets 22, 122 are provided so as to overlap the second sheet 304. Can evenly receive the atmospheric pressure Po in the external space, and it is possible to obtain more stable valve opening characteristics.

Further, in the above-mentioned Examples 1 and 2, the first sheets 22, 122 and the second sheets 22, 124 have uniform thicknesses, but the thicknesses may be partially different. In the first sheet 312 of FIG. 21, the thickness near the center is increased to increase the adhesion of the second sheet 24 to the vicinity of the second through hole 34, so that the internal space E1 and the external space E2 at the start of intake air are combined with each other. The absolute value of the differential pressure is large, that is, the pressure value P2 can be set to a relatively low value. Further, in the first sheet 322 of FIG. 22, by providing a portion having a small thickness in an annular shape, it is possible to set a deformed portion at the time of intake air, and it is possible to obtain a more stable valve opening characteristic.

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: Breather device (Vehicle breather device)
12: Case 14: Breather body 18: Cap (biasing member)
20: Communication hole 20a: Opening edge 22,122,222,223,242,252,262,321,322: First sheet 24,124,224,234,264,284,294,304: Second sheet 26: Spring (biasing member)
32: First through hole 34: Second through hole CL: Central axis E1: Internal space E2: External space

Claims (1)

A vehicle breather device that communicates between the internal space and external space of the case.
A breather body having a communication hole that communicates with the internal space,
A first sheet in which a first through hole is formed which is seated on the opening edge of the communication hole formed in the breather body on the external space side and communicates with the communication hole.
A second sheet which is provided so as to be overlapped on the external space side of the first sheet and has a second through hole which communicates with the external space and does not overlap with the first through hole.
An urging member for urging the first sheet to the opening edge via the second sheet.
A vehicle breather device characterized in that the elastic modulus of the first seat is larger than the elastic modulus of the second seat.

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