JP2549887Y2 - Air breather device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air breather device applied to a vehicle transmission and the like.

[0002]

2. Description of the Related Art In a vehicle transmission, an air breather device is mounted on the casing to reduce a load on a seal portion due to an increase in pressure inside the transmission casing and to prevent leakage of lubricating oil inside the casing due to breakage of the seal portion. As an example of the device, as shown in FIG. 4, a breather chamber d is formed on a bearing holding wall c for holding a bearing b in a casing a at a distance from one side surface of the bearing b. The breather chamber d communicates with a long breather hole f formed in the bearing holding wall c through a recess e formed in the center thereof so that the top of the breather hole f is closed by an air breather g. Is known.

[0003]

However, in the above-described structure, the oil that has entered the air breather chamber d and the recessed portion e from the clearance h between the outer ring and the ball and the inner ring and the ball of the bearing b re-enters the clearance h. The air is not drained into the casing a but gradually accumulates in the air breather chamber d and the concave portion e, and the operation time of the vehicle is extended and reaches the air breather hole f.

[0004] The oil that has reached the air breather hole f gradually closes the air breather hole f, and then the pressure inside the casing a rises and pushes the oil upward (to the air breather g side). By repeating this operation, the oil reaches the air breather g and blows out from the air breather g. The present invention has been developed to address such a problem, and has as its object to prevent oil from blowing out from an air breather hole.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiment. A breather chamber 4 is formed with an interval from one side surface of the bearing 2, and the breather chamber 4 is formed with a long hole formed in the holding wall 3 through a recess 5 formed in the center of the breather chamber 4. The top of the breather hole 6 is connected to the air breather
In the air breather device, the annular breathing chamber 4 is provided with an annular projecting wall 8 projecting from the front surface of the recess 5 and a drain hole 9 extending from the lower surface of the bearing 2 into the casing 1. It is characterized by.

[0006]

According to the present invention, the oil penetrating from the clearance between the balls of the bearing by the above means is drained into the casing from the lower drain hole along the wall surface of the casing. At this time, the oil on the wall is difficult to enter into the recess due to the protruding wall formed in a circular shape on the wall, and prevents oil from entering the recess and the breather hole.
The oil does not reach the air breather and blow out to the outside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 denotes a casing.
A breather chamber 4 is formed on a bearing holding wall 3 for holding the bearing 2 in the inner space at a distance from one side surface of the shaft 2.
Is communicated with a long breather hole 5 formed in the holding wall 3 through a concave portion 5 formed in the center thereof, and an air breather 7 for closing the breather hole 6 is provided at the top of the breather hole 6.
Is provided.

These are the same as the prior art described above, but in the present invention, the breather chamber 4 is provided with an annular projecting wall 8 projecting from the front surface of the recess 5 and the bearing 2 is provided.
A drain hole 9 extending from the lower surface to the inside of the casing 1 is provided.
In the figure, reference numeral 10 denotes a shaft, and 11 denotes a gear. Thus, casing 1
The oil that is scattered in the air enters the air breather chamber 4 from the clearance of the ball of the bearing 2, and the infiltrated oil is discharged from the drain hole 9 as shown by an arrow in FIG. At this time, the oil on the bearing holding wall 3 does not easily enter the recess 5 due to the projecting wall 8 projecting annularly from the wall surface, thereby preventing the oil from entering the recess 5 and the breather hole 6.

[0009]

As described above, according to the present invention, the breather chamber has an annular protruding wall protruding from the front surface of the recessed portion connected to the breather hole provided at the center of the breather chamber, and a drain extending from the lower surface of the bearing into the casing. Since oil is provided in the breather chamber, the oil that has entered the breather chamber is discharged into the casing through the drain hole, and the oil that continues on the wall surface flows into the recessed portion connected to the breather hole by the protruding wall. Since it is not provided, there is an effect that oil can be prevented from blowing out from the top of the breather hole.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Bearing 3 Bearing holding wall 4 Breather chamber 5 Depression 6 Breather hole 7 Air breather 8 Projection wall 9 Drain hole

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 54-15179 (JP, U) Japanese Utility Model Showa 55-36716 (JP, U) Japanese Utility Model Showa 57-61266 (JP, U) Japanese Utility Model Showa 58- 116887 (JP, U) Japanese Utility Model Showa 60-99355 (JP, U) Japanese Utility Model Showa 62-46853 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A breather chamber is formed in a bearing holding wall in a casing so as to be spaced from one side surface of a bearing, and the breather chamber is connected to the holding wall via a recess formed in a central portion thereof. In the air breather device, which is communicated with a breather hole of a long hole to be bored, and a top of the breather hole is closed by an air breather, an annular protruding wall protruding from a front surface of the recess in the breather chamber; An air breather device having a drain hole extending from a lower surface into a casing.