JPH0532863U - Air breather device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent oil from blowing out from the air breather hole. A breather chamber 4 is formed in a bearing holding wall 3 in a casing 1 at a distance from one side surface of the bearing 2, and the breather chamber 4 is provided with a recessed portion 5 provided in a central portion thereof. And a ring-shaped protruding wall 8 protruding to the front surface of the concave portion 5 in the breather chamber 4,
Drain hole 9 extending from the lower surface of the bearing 2 into the casing 1
It is characterized by having and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air breather device applied to a vehicle transmission or the like.

[0002]

[Prior Art]

 In a vehicle transmission, an air breather device is attached to the casing to reduce the load on the seal portion due to the increase in pressure inside the transmission casing and to prevent the leakage of lubricating oil inside the casing due to the damage of the seal portion. As an example of the apparatus, as shown in FIG. 4, a breather chamber d is formed in a bearing holding wall c that holds a bearing b in a casing a with a space from one side surface of the bearing b. Is communicated with a breather hole f, which is a long hole formed in the bearing holding wall c, through a recess e formed in the center thereof, and the top of the breather hole f is closed by an air breather g. Are known.

[0003]

[Problems to be solved by the device]

 However, in the structure as described above, the oil that has entered the air breather chamber d and the concave portion e through the clearance h between the outer ring and the ball and the inner ring and the ball of the bearing b is not drained again into the casing a through the clearance h. Instead, it gradually collects in the air breather chamber d and the recessed portion e, and reaches the air breather hole f as the operating time of the vehicle becomes longer.

The oil reaching the air breather hole f gradually closes the air breather hole f, and the pressure inside the casing a rises to push the oil upward (to the air breather g side). By repeating this operation, the oil reaches the air breather g and is blown out from the air breather g. The present invention was developed to address such problems, and it is an object of the present invention to prevent oil from blowing out from the air breather hole.

[0005]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiments. According to the present invention, a bearing holding wall 3 in a casing 1 is provided with one side surface of a bearing 2 and a space therebetween. To form a breather chamber 4, and the breather chamber 4 is communicated with a breather hole 6 which is a long hole bored in the holding wall 3 through a recessed portion 5 which is recessed in the central portion of the breather chamber 4. In the air breather device in which the top of the hole 6 is closed by the air breather 7, the breather chamber 4 has an annular projecting wall 8 projecting from the front surface of the recess 5, and the lower surface of the bearing 2 is connected to the inside of the casing 1. And a drain hole 9 are provided.

[0006]

[Action]

 According to the present invention, the oil that has entered through the clearance between the balls of the bearing by the above means is drained into the casing through the drain hole below by connecting the wall surface of the casing. At this time, the oil that connects the wall surface does not easily enter the recess due to the protruding wall formed in the annular shape on the wall surface, and prevents the oil from entering the recess and the breather hole, so the oil reaches the air breather and blows out to the outside. Will disappear.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 denotes a casing, and a bearing holding wall 3 for holding a bearing 2 in the casing 1 has a space on one side of the shaft 2. To form a breather chamber 4, and the breather chamber 4 is communicated with a breather hole 5 which is an elongated hole formed in the holding wall 3 through a recessed portion 5 which is recessed in the central portion of the breather chamber 4. An air breather 7 for closing the hole 6 is provided at the top of the hole 6.

Although these are the same as the above-mentioned conventional example, in the present invention, the breather chamber 4 is provided with an annular projecting wall 8 projecting to the front surface of the recessed portion 5, and the casing 1 is provided from the lower surface of the bearing 2. A drain hole 9 extending inside is provided. In the figure, 10 is a shaft and 11 is a gear. Thus, the oil present in the state of being scattered in the casing 1 infiltrates into the air breather chamber 4 through the clearance of the balls of the bearing 2, and the infiltrated oil passes through the bearing holding wall 3 and from the drain hole 9 as shown by the arrow in FIG. Is discharged. At this time, the oil that fills the bearing holding wall 3 does not easily enter the recess 5 by the protruding wall 8 that projects annularly on the wall surface, and prevents the oil from entering the recess 5 and the breather hole 6.

[0009]

[Effect of the device]

 As described above, according to the present invention, the breather chamber is provided with the annular projecting wall projecting to the front surface of the recessed portion which is connected to the breather hole provided in the center thereof and the drain hole which is connected to the inside of the casing from the lower surface of the bearing. Therefore, the oil that has entered the breather chamber is discharged into the casing through the drain hole, and the oil that connects the wall surface does not flow into the recessed portion that is connected to the breather hole due to the protruding wall. This has the effect of preventing oil from blowing out from the top of the breather hole.

[Brief description of 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 along the line AA of FIG.

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

[Explanation of symbols]

 1 casing 2 bearing 3 bearing holding wall 4 breather chamber 5 recessed portion 6 breather hole 7 air breather 8 protruding wall 9 drain hole

Claims (1)

[Scope of utility model registration request] 1. A bearing holding wall in a casing is provided with a breather chamber spaced apart from one side surface of the bearing, and the breather chamber is provided in the holding wall via a recessed portion provided in a central portion of the breather chamber. In an air breather device in which a breather hole of a long hole to be bored is communicated, and the top of the breather hole is closed by an air breather, in the breather chamber, an annular projecting wall projecting in front of the recessed portion, and the bearing. An air breather device, characterized in that a drain hole extending from the lower surface into the casing is provided.