JPS608220Y2 - Breather device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a breather device.

In conventional devices of this type, the opening inside the case of the device is generally formed into a tubular shape or a small hole shape, so that oil scattered inside the case tends to adhere to the opening. When the amount of attached oil increases, an oil film is formed on the opening.

As the pressure inside the case increases, the oil film moves to the opening outside the case of the breather device, causing oil leakage.

Therefore, the present invention reduces the end of the breather pipe exposed inside the case to a smaller outer diameter than the center, attaches an opening at one end to the outer periphery, and separates the closed end at the other end from the opening at the end of the breather pipe. The present invention provides a breather device characterized in that the above-mentioned drawbacks are solved by providing a cylindrical mesh member covering the opening at the end of the breather pipe.

Embodiments of the present invention will be described below with reference to the accompanying drawings, but before that, a conventional device will be described.

In FIG. 1, 1 is a case wall, and a hole 1a is formed in the wall 1.

10 is a breather device, and this device 10 is a breather pipe 1.
1 and a cap 12, one of which is the pipe 11.
is fitted into the hole 1a of the case wall 1 at its substantially central portion in the axial direction, so that one end 11a thereof is exposed inside the wall 1, that is, downwardly as seen in the figure, and the other end 11
b is exposed outside the wall 1, that is, upwardly as seen in the figure;
The other cap 12 is connected to the other end 1 of the pipe 11.
1b with a predetermined gap passage.

Then, due to the rotation of a gear (not shown) in the case wall 1, the oil that is scattered spreads to one end 11a of the breather pipe 11.
As a result, an oil film 20 is formed on one end 11a of the breather pipe 11 as shown in the first figure, and as the pressure inside the case wall 1 increases, the oil film 20 rises as shown by the arrow in the same figure. The other end 11 is reached when the other end 11b is reached.
The oil flows out from the passage between b and the cap 12, resulting in an oil leak.

Next, the device of the present invention will be explained with reference to FIG.

However, since the configuration of FIG. 2 is substantially the same as that of FIG. 1, the same members in both are designated by the same reference numerals, and the different parts, that is, the main parts of the present invention will be explained.

Reference numeral 30 denotes a mesh-like member, and the member 30 is formed into a cylindrical shape with one end open and the other end closed, and the opening is attached to the outer periphery of one end 11a of the breather pipe 11 as shown in FIG. There is.

The oil is scattered by the rotation of a gear (not shown) inside the case wall 1, and hits the mesh member 30 projecting downward from the case wall 1, where the oil droplets are crushed and fall. , some of the oil adheres to the mesh parts and forms a fine oil film.

Therefore, formation of an oil film directly on the open end 11a of the breather pipe 11 is prevented, and when a pressure difference is created between the inside and outside of the case wall 1, a part of the oil film adhering to the mesh portion is broken. Because of the breeze effect,
Even if the pressure inside the case wall 1 increases, oil leakage due to the rise of the oil film is prevented.

Note that the mesh member 30 is not limited to the one formed in the downwardly protruding cylindrical shape of the embodiment, but, for example, only the attachment portion to the breather pipe 11 may be made small in diameter to prevent the formation of a fine oil film. The diameter of the part where the oil is attached, that is, the part where some oil is attached, may be made larger in diameter.

As described in detail above, according to the device of the present invention, the end of the breather pipe exposed to the inside of the case wall is narrowed to a smaller outer diameter than the central part fitted into the hole in the case wall, and one end is opened on the outer periphery. By attaching a cylindrical mesh member to cover the opening at the end of the breather pipe, and separating the other end closing part from the opening at the end of the breather pipe, the oil scattered inside the case can be prevented from entering the breather pipe. This prevents direct adhesion to the opening inside the case, and even if some of the scattered oil adheres to the mesh member and forms a fine oil film, the pressure difference between the inside and outside of the case prevents the cylindrical mesh member from sticking. Since the oil film is cut off at the other end closing part and the cylindrical part to create a breather, it is possible to prevent oil leakage caused by the rise of the oil film along the inner surface of the breather pipe due to the pressure increase in the case. It is only necessary to attach the opening of the cylindrical mesh member to the outer periphery of the end, which has an outer diameter smaller than the center part, and the mounting length is determined by the stepped part of the outer diameter, so there is no variation in the mounting length during assembly. Since it is easy to assemble and has a simple structure, it can be put to practical use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional breather device attached to a case wall, and is a diagram for explaining the operation. FIG. 2 is a diagram illustrating an embodiment of the present invention corresponding to FIG. 1. 1... Case wall, 1a... Hole, 11.
... Breather pipe, 11a ... One end of the breather pipe, 11b ... Other end of the breather pipe, 12 ... Cap, 30 ... Cylindrical shape mesh member.

Claims (1)

[Scope of utility model registration request] A breather pipe that is fitted into a hole in a case wall at its center and has one end exposed to the inside of the case wall and the other end exposed to the outside of the case wall, and a predetermined gap at the other end of the breather pipe. The breather pipe has a cap attached to hold the passage, and one end of the breather pipe is narrowed to an outer diameter smaller than that of the center part, and an opening at one end is attached to the outer periphery of the narrowed one end, and a closed part at the other end. A breather device comprising a cylindrical mesh member which is spaced apart from an opening at one end of the breather pipe and covers the opening at one end of the breather pipe.