JP2010242872A - Breather - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a breather having high waterproofness to water leaking in a case via the breather, by adjusting pressure of the case inside, by surely collecting liquid of the case inside without discharging, even when pressure in the case suddenly increases. <P>SOLUTION: This breather adjusts internal pressure of the case inside, by reducing the internal pressure by exhausting to an external part, when the internal pressure of the case inside becomes high by exceeding predetermined pressure. The breather includes an exhaust passage for communicating with the external part from the case inside, a liquid collecting passage for collecting liquid discharged from the case inside to the case inside, and a discharge valve means for opening a valve when the internal pressure of the case inside exceeds the predetermined pressure, and is characterized in that a fluid collecting passage is arranged on the atmospheric side going over the discharge valve means, and a collecting valve means is arranged in this fluid collecting passage, and a rubber elastic material labyrinth lip opposed with a narrow clearance to a case surface is arranged on the outer peripheral edge of a cover body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a breather.
The present invention also relates to a breather that is mounted on an apparatus such as an automatic transmission such as an automobile and adjusts the internal pressure of the apparatus by reducing the pressure when the internal pressure of the apparatus changes.

Furthermore, the present invention relates to a breather suitable for being attached to the top of a sealing device in which a liquid is sealed in a sealed space.
The present invention also relates to a breather having a high waterproof property against water or the like entering the case through the breather while ensuring sufficient gas circulation between the inside and the outside of the case.

Conventionally, a breather as shown in Patent Document 1 is known.
This type of breather has a structure in which the valve plate is opened and closed by a coil spring, so that not only the structure becomes complicated, but the valve plate opens more than necessary, so that the fuel and hydraulic oil in the device can easily flow out. Caused a problem that muddy water could easily enter.

Accordingly, a breather having an improved structure as shown in FIG. 4 has been proposed as an improved breather. (Patent Document 2)
That is, the breather exhausts the internal pressure in the case 600 from the exhaust path 401 provided in the case 600, and recovers the liquid such as oil mixed in the exhaust path 401 to the fluid recovery path 501 provided in the case 600. Is.

The breather includes a hexagon bolt 200 fastened to the screw hole 601 of the case 600, a cover 700 that covers and surrounds the hexagon bolt 200, and a partition member that is mounted in the space formed by the cover 700. It consists of 140.

The hexagonal bolt 200 has a communication hole 201 provided in the shaft center from the tip end side of the screw portion, a first and second passages 202 and 203 that communicate with the communication hole 201 at right angles and open to the outer peripheral surface of the shaft portion. Is provided.
The cover 700 includes a disc portion 701 and a cylindrical portion 702 that extends downward at an outer diameter end of the disc portion 701.

The disc portion 701 is provided with an insertion hole 703 through which the hexagon bolt 200 is inserted.
The cylindrical portion 702 is provided with an exhaust hole 704 for exhausting to the outside.
The partition member 140 includes a metal ring 101 and a rubber-like elastic body 102 made of a material such as acrylic rubber that is integrally baked around the metal ring 101.

The metal ring 101 includes an annular portion 103, a first cylindrical portion 104 that is bent upward from the inner diameter end of the annular portion 103 and extends upward, and is bent downward from an outer diameter end of the annular portion 103. The second cylindrical portion 105 extends.
The partition member 140 includes a lip portion 106 that extends upward from the upper surface of the annular portion 103 and toward the outer diameter direction.

The partition member 140 partitions the space in the cover 700 into an exhaust chamber 800 and a collection chamber 900.
In the breather having such a configuration, when the pressure in the case 100 exceeds a predetermined pressure, the lip portion 106 of the partition member 140 opens away from the contact state with the disc portion 701 of the cover 700, and the exhaust gas is exhausted. Exhaust is performed from the chamber 800 through the exhaust hole 704 to reduce the internal pressure.

Further, when the case 600 has a large amount of liquid such as oil, the liquid such as oil is guided from the exhaust passage 401 to the communication hole 201, and the liquid such as oil in the communication hole 201 is communicated with the communication hole as the internal pressure increases. It moves upward in 201.

Here, the communication hole 201 is provided with a first passage 202, and a liquid such as oil flows into the first passage 202.
Thereby, the liquid such as oil is guided to the recovery chamber 900 through the first passage 202 and is recovered from the recovery chamber 900 through the fluid recovery path 501 into the case 600.

However, liquid such as oil that has passed through the first passage 202 and has flowed out of the second passage 203 is difficult to recover, and has a high risk of being discharged outside through the lip portion 106.
In particular, this tendency was remarkable when the internal pressure in the case 600 suddenly increased.
Further, when the internal pressure in the case 600 becomes a negative pressure, the lip portion 106 hinders the intrusion of the atmosphere from the outside, causing a problem that the internal negative pressure cannot be eliminated.
Furthermore, there is a concern that water, earth and sand, etc. may enter the case 600 when the breather attachment site is immersed in water.

JP 2007-127139 A JP 2001-355713 A

  The present invention has been made in view of the above-described problems, and even when the pressure in the case suddenly increases, the liquid inside the case is not discharged, but is reliably recovered, and only exhausted to the outside. An object of the present invention is to provide a breather that can adjust the pressure inside the case and has high waterproofness against water that enters the case through the breather.

  The breather of the present invention is a breather for adjusting the internal pressure inside the case by exhausting outside to reduce the internal pressure when the internal pressure inside the case exceeds a predetermined pressure. An exhaust path that leads from the inside to the outside, a liquid recovery path that recovers the liquid discharged from the inside of the case, and a discharge valve means that opens when the internal pressure inside the case exceeds a predetermined pressure. In the breather, the fluid recovery passage is provided on the atmosphere side beyond the discharge valve means, the recovery valve means is provided in the fluid recovery passage, and a disk-like cover body fixedly held on the surface of the case, and the cover body A partition member that partitions the space surrounded by the exhaust chamber and the recovery chamber, and the exhaust valve means includes an exhaust lip made of a rubber-like elastic material provided integrally on the partition member side. The cover body side is elastically contacted in a form extending toward the atmosphere side, and the recovery valve means includes a recovery lip made of a rubber-like elastic material integrally provided on the partition member side, and the case side. The cover body is elastically contacted so as to extend toward the inner side, and a labyrinth slip made of rubber-like elastic material facing the case surface with a narrow gap is provided on the outer peripheral edge of the cover body.

The present invention has the following effects.
According to the breather of the first aspect of the invention, even when the pressure in the case suddenly increases, the liquid inside the case can be reliably recovered without being discharged, and only the outside can be exhausted. High water resistance against water entering the case through the breather.
According to the breather of the invention described in claim 2, when the structure is simple and the internal pressure becomes equal to or higher than the predetermined pressure, the valve can be opened to release the internal pressure to the outside, and when the internal pressure becomes negative. Can surely guide the atmosphere to the inside.

According to the breather of the invention described in claim 3, the structure is simple and prevents the entry of water or the like from the outside, and when the internal pressure becomes negative, the atmosphere can be reliably guided to the inside. I can do it.
According to the breather of the invention described in claim 4, when the internal pressure becomes a negative pressure, the atmosphere can be introduced uniformly from the circumferential direction, so that the negative pressure can be quickly eliminated.

According to the breather of the fifth aspect of the present invention, it is possible to reliably prevent the ingress of water / muddy water from the outside, and more reliably prevent the internal fluid from flowing out of the case.
According to the breather of the sixth aspect of the invention, the outflow of the internal fluid can be prevented even in a situation where the fluid in the case bumps.

According to the breather of the invention described in claim 7, the fluid in the fluid recovery path can be recovered smoothly.

It is sectional drawing which shows 1st Embodiment of the invention concerning a breather. It is sectional drawing which shows 2nd Embodiment of the invention concerning a breather. It is a partial enlarged view for demonstrating the function of 2nd Embodiment of FIG. It is sectional drawing which showed the breather which concerns on a prior art.

The best mode for carrying out the present invention will be described below with reference to the drawings.
<First Embodiment>
In FIG. 1, the breather according to the present invention adjusts the internal pressure inside the case 6 by exhausting outside to reduce the internal pressure when the internal pressure inside the case 6 exceeds a predetermined pressure. Is.

The breather includes an exhaust path 4 that leads from the inside Y of the case 6 to the outside, a liquid recovery path 5 that collects the liquid discharged from the inside 6 of the case 6 in the inside 6 of the case 6, and an internal pressure inside the case 6 that is a predetermined pressure. The exhaust valve means 1 is opened when the pressure exceeds 1, the fluid recovery passage 5 is provided on the atmosphere X side beyond the exhaust valve means 1, and the recovery valve means 3 is provided in the fluid recovery passage 5.
A disk-shaped cover body 7 is fixed and held on the surface of the case 6.
The cover body 7 is made of a resin material such as a polyamide resin, a metal material, or the like, and includes a disc portion 71 and a cylindrical portion 72 that extends downward to an outer diameter end of the disc portion 71.
The disc portion 71 is provided with an insertion hole through which the hexagon bolt 15 is inserted.

Further, the space 13 surrounded by the cover body 7 is partitioned into an exhaust chamber 8 and a recovery chamber 9 by a partition member 14.
The exhaust valve means 1 has an exhaust lip 1 made of a rubber-like elastic material made of a material such as acrylic rubber, which is integrally provided on the partition member 14 side, facing the cover body 7 side and the atmosphere X side. Elastic contact in a stretched form.
Further, the recovery valve means 3 is elastically contacted with a recovery lip 3 made of a rubber-like elastic material integrally provided on the partition member 14 side so as to extend toward the inner Y side on the case 6 side. .

At the lower end edge of the cylindrical portion 72 of the cover body 7, a labyrinth slip 20 made of rubber-like elastic material is provided so as to face the surface of the case 6 with a narrow gap.
Further, a labyrinth passage 2 is provided on the atmosphere X side beyond the fluid recovery passage 5.
A baffle plate 11 is disposed on the inside Y side of the exhaust path 4.
Furthermore, the bottom surface 12 of the collection chamber 9 is an inclined surface that converges toward the collection lip 3 side.

The partition member 14 includes a metal ring 16 and a rubber-like elastic body 17 made of a material such as acrylic rubber that is integrally baked around the metal ring 16.
The metal ring 16 includes an annular portion 161, a first cylindrical portion 162 that is bent downward from the inner diameter end of the annular portion 161 and extends downward, and is bent downward from an outer diameter end of the annular portion 161. The second cylindrical portion 163 extends.
The partition member 14 includes an exhaust lip 1 that extends upward and outward from the upper surface of the annular portion 161, a recovery lip 3 that extends downward and radially toward the lower surface of the annular portion 161, and The labyrinth protrusion 10 extends substantially straight from the upper surface of the outer peripheral end of the annular portion 161 upward and extends toward the disc portion 7 of the cover body 7.

The partition member 14 has an exhaust hole 18 for communicating the passage 61 and the exhaust chamber 8 inside the exhaust lip 1, and a collection hole for communicating the exhaust chamber 8 and the collection chamber 9 outside the exhaust lip 1. 19 is provided.
The cover body 7, the partition member 14, and the baffle plate 11 are integrated by screwing a hexagon bolt 15 into a screw groove provided in the case 6.
Further, a cylindrical sleeve 151 and a washer 152 are arranged on the outer periphery of the hexagon bolt 15 in order to avoid excessive tightening.

In the breather having such a configuration, when the pressure in the case 6 exceeds a predetermined pressure, the exhaust lip 1 opens away from the contact state with the disc portion 71 of the cover body 7, and the labyrinth from the exhaust chamber 8 opens. Exhaust is performed to the atmosphere X side through the passage 2 to reduce the internal pressure.
Further, when there is a lot of liquid such as oil inside the case 6, the liquid such as oil is first prevented from entering the exhaust path 4 by the baffle plate 11.
Then, the liquid such as oil that has reached the exhaust lip 1 is returned from the exhaust hole 18 to the inside of the case 6.
Furthermore, liquid such as oil that has exceeded the exhaust lip 1 is stored in the recovery chamber 9 through the recovery hole 19.

The liquid accumulated in the recovery chamber 9 is separated from the upper surface of the case 6 when the pressure on the recovery chamber 9 side becomes higher than the internal Y side (when the internal Y becomes negative pressure). And flows into the passage 61 side.
In particular, since the bottom surface of the collection chamber 9 is an inclined surface that converges toward the collection lip 3 side, the liquid is smoothly collected.
Further, an annular lip is provided on each of the inner peripheral surface in contact with the outer peripheral surface of the sleeve 151 on the radially inner peripheral side of the rubber-like elastic body 17 and the axial end surface in contact with the inner peripheral side of the disc portion 71 of the cover body 7. , Has improved sealing.

<Second Embodiment>
In FIG. 2, the difference from the first embodiment described above is that a protrusion 21 is provided in the vicinity of the tip end side of the labyrin slip 20 on the cover body 7 side.
As a result, as shown in FIG. 3, the labyrinth slip 20 is first deformed from the state shown in FIG. 3A to the state shown in FIG.
That is, only the tip of the labyrinth slip 20 is in contact with the surface of the cover body 7.
Next, as shown in FIG. 3 (c), when the projection 21 comes into contact with the surface of the cover body 7, the contact of the tip of the labyrin slip 20 is released, and the atmosphere on the outside X side enters the inside Y side. By allowing, the negative pressure on the internal Y side is eliminated.
If at least one protrusion 21 is present, the function can be exhibited. However, it is preferable to provide a plurality of protrusions 21 on the surface of the labyrin slip 20 so that air can be uniformly introduced from the circumferential direction.

  The present invention is not limited to the best mode for carrying out the invention described above, and various other configurations can be adopted without departing from the gist of the present invention.

1 exhaust lip 2 labyrinth passage 3 recovery lip 4 exhaust passage 5 fluid recovery passage 6 case 7 cover body 8 exhaust chamber 9 recovery chamber 10 labyrinth projection 11 baffle plate 12 bottom surface 13 space 14 partition member 15 hexagon bolt 16 metal ring 17 rubber-like elasticity Body 18 Exhaust hole 19 Recovery hole 20 Labyrinth slip

Claims (7)

  When the internal pressure inside the case (6) exceeds a predetermined pressure, the breather exhausts outside to reduce the internal pressure, and adjusts the internal pressure inside the case (6) (Y). The exhaust path (4) leading from the inside (Y) of the case (6) to the outside, and the liquid discharged from the inside (Y) of the case (6) is collected in the inside (Y) of the case (6). In a breather comprising a liquid recovery path (5) and a discharge valve means (1) that opens when the internal pressure inside the case (6) exceeds a predetermined pressure, the discharge valve means (1) The fluid recovery passageway (5) is provided on the atmosphere (X) side beyond, the recovery valve means (3) is provided in the fluid recovery passageway (5), and a disk-like shape fixed and held on the surface of the case (6). A cover body (7) and a space (13) surrounded by the cover body (7) are connected to an exhaust chamber (8). A partition member (14) for partitioning into a recovery chamber (9), and the discharge valve means (1) is an exhaust lip made of a rubber-like elastic material provided integrally on the partition member (14) side ( 1) is in elastic contact with the cover body (7) side so as to extend toward the atmosphere (X) side, and the recovery valve means (3) is integrated with the partition member (14) side. A provided recovery lip (3) made of rubber-like elastic material is in elastic contact with the case (6) side so as to extend toward the inside (Y) side, and is outside the cover body (7). A breather characterized in that a labyrinth slip (20) made of rubber-like elastic material is provided on the peripheral edge (72) with a narrow gap facing the surface of the case (6).   The breather according to claim 1, wherein a protrusion (21) is provided on the cover body (7) side in the vicinity of the tip end side of the labyrinth slip (20).   When the labyrinth slip (20) has a negative pressure on the inside (Y) side of the case (6), first the tip of the labyrinth slip (20) is in contact with the surface of the cover body (7), and then the protrusion The breather according to claim 2, wherein the contact of the tip of the labyrin slip (20) is released by contacting the surface of the cover body (21).   The breather according to claim 2 or 3, wherein a plurality of the protrusions (21) are provided on the surface of the labyrinth slip (20).   The labyrinth passage (2) is provided on the atmosphere (X) side beyond the fluid recovery passage (5) and on the inner side (Y) side than the labyrin slip (20). The breather as described in any one of -4.   The breather according to any one of claims 1 to 5, wherein a baffle plate (11) is provided on the inside (Y) side of the exhaust path (4).   The breather according to any one of claims 1 to 6, wherein the bottom surface (12) of the recovery chamber (9) is an inclined surface that converges toward the recovery lip (3).

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