JP2010014235A - Breather mounting structure and power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable stable support and easy mounting operations from outside. <P>SOLUTION: There is provided a breather mounting structure 6 for pressing a one-way valve 5 for regulating an inner pressure of a transfer case 3, into a mounting hole 7 of the transfer case 3 having a varying inner pressure to support the on-way valve. A tubular portion 15 for ensuring a pressing length in the mounting hole 7 is protrudingly provided integrally with an inside of the transfer case 3. Thus, the transfer case 3 is easily mounted from outside to stabilize the support of the one-way valve 5, thereby permitting the one-way valve 5 to be hard to disengage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a breather mounting structure and a power transmission device used for a transfer of an automobile or the like.

  In a vehicle power transmission device, for example, a transfer, a one-way valve or a breather pipe is provided in a casing as a breather member for adjusting an internal pressure. With this one-way valve or breather pipe, high-pressure gas inside the casing can be discharged to the outside, and the internal pressure of the casing can be made appropriate.

  Examples of the breather mounting structure for mounting the breather member to the casing include those described in Patent Documents 1 and 2.

  In Patent Document 1, a mounting hole is formed in a mounting plate, and a breather unit is fitted into this mounting hole, and this mounting plate closes a viewing window for visually confirming the engagement of gears. It has a structure that doubles as.

  The thing of patent document 2 has the structure which formed the cylinder part which protruded outside in the inlet pipe, and inserted the breather pipe.

  Therefore, in the structure of Patent Document 1, there is an advantage that the breather unit can be easily attached from the outside, but there is a problem in the support strength because the breather unit is fitted and attached to the attachment hole.

  The structure of Patent Document 2 has an advantage that the support of the breather pipe is stabilized, but there is a problem that it is difficult to attach the breather pipe from the outside.

Japanese Utility Model Publication No. 7-14259 JP 2006-246588 A

  The problem to be solved is that mounting the breather unit by fitting it in the mounting hole has a difficulty in supporting strength, and inserting the breather tube into the cylinder part protruding outwards requires the breather tube to be It is difficult to install.

  In the breather mounting structure of the present invention, in order to make the support stable and easy to mount from the outside, the breather mounting for press-fitting and supporting the breather member for adjusting the internal pressure in the casing in the mounting hole of the casing having the internal pressure fluctuation It is a structure, and the most main feature is that a cylindrical portion for securing the length of the press-fitting in the mounting hole is integrally projected to the inside of the casing.

  The present invention is a breather mounting structure in which a breather member for adjusting the internal pressure in the casing is press-fitted and supported in a mounting hole of the casing having a variation in internal pressure, and the length of the press-fitting is secured by the mounting hole. A cylindrical portion for projecting was integrally provided inside the casing.

  For this reason, since the member for breathers is press-fitted into the cylindrical portion integrally protruding from the inside of the casing, it is possible to facilitate attachment from the outside of the casing. Moreover, since the length of press-fitting in the mounting hole is ensured by the cylindrical portion, the support of the breather member can be stabilized.

  The purpose of stabilizing the support and facilitating the attachment from the outside is realized by a cylindrical portion integrally projecting from the inside of the casing.

  1 to 3 relate to a first embodiment of the present invention, FIG. 1 is a side view of a power transmission device, FIG. 2 is an upper side sectional view of a breather chamber, and FIG. 3 is an enlarged sectional view of a cylindrical portion. is there.

  As shown in FIG. 1, a one-way valve 5, which is a breather member, is attached to a transfer case 3, which is a casing having fluctuations in internal pressure, by a breather mounting structure 6 in a transfer 1 that is a power transmission device. The one-way valve 5 is for adjusting the internal pressure in the transfer case 3, and is press-fitted and supported in the mounting hole 7 of the breather mounting structure 6 as shown in FIG.

  The mounting hole 7 is formed in a steel plate cover 9 which is a plate material constituting a part of the transfer case 3 in this embodiment. The cover 9 covers, for example, the upper part of the breather chamber 11 of the transfer case 3 and is fastened and fixed to the transfer case 3 with bolts 13.

  In the mounting hole 7, a cylindrical portion 15 is integrally projected to the inside of the transfer case 3. The cylindrical portion 15 is for securing the press-fitting length of the one-way valve 5 and is formed on the cover 9 by burring in this embodiment.

  The overall shape of the cylindrical portion 15 is formed so as to have a tapered shape toward the tip end side in the transfer case 3, and the outer surface of the cover 9 constituting the outer surface of the casing and the inner hole 15 a of the cylindrical portion 15. A round 17 is formed between the two. The round 17 can be replaced with a taper. This taper is set to 1/20 taper, for example.

  The taper of the overall shape of the cylindrical portion 15 is formed so that the diameter on the side of the round 17 is slightly smaller than the outer diameter of the fitting portion 5a of the one-way valve 5, and the fitting portion 5a is attached to the cylindrical portion 15 by press fitting. Yes.

  The attachment of the one-way valve 5 to the mounting hole 7 is performed by aligning the fitting portion 5a of the one-way valve 5 with the mounting hole 7 and press-fitting it as it is before fixing the cover 9 to the transfer case 3. Let it be done. At the time of press-fitting, the R 17 serves as a press-fitting guide, and smooth attachment by press-fitting can be performed.

  In the attached state, the press-fitting length can be secured by press-fitting the fitting portion 5a to the cylindrical portion 15.

  When the pressure in the transfer case 3 becomes high due to high temperature during power transmission, the breather chamber 11 discharges the pressure from the one-way valve 5 to the outside and keeps the pressure in the transfer case 3 constant.

  Furthermore, the breather chamber 11 prevents the lubricating oil splashed by the rotation of the gear in the transfer case 3 from splashing toward the one-way valve 5 and prevents the lubricating oil from leaking. In particular, since the airflow in the breather chamber 11 is guided along the cover 9 and on the outer periphery of the cylindrical portion 15 as indicated by an arrow, leakage from the one-way valve 5 can be reliably suppressed.

[Effect of Example 1]
The embodiment of the present invention is a breather mounting structure 6 in which a one-way valve 5 for adjusting the internal pressure in the transfer case 3 is press-fitted and supported in the mounting hole 7 of the transfer case 3 having a variation in internal pressure. A cylindrical portion 15 for securing the length of the press-fitting at the mounting hole 7 is integrally projected to the inside of the transfer case 3.

  For this reason, since the one-way valve 5 is press-fitted into the cylindrical portion 15 that protrudes integrally to the inside of the transfer case 3, the attachment from the outside of the transfer case 3 can be facilitated. Further, since the length of the press-fitting in the mounting hole 7 is secured by the cylindrical portion 15, the support of the one-way valve 5 can be stabilized and the one-way valve 5 can be made difficult to come off. In order to secure the length of press-fitting in the mounting hole 7, a seal can be made unnecessary.

  Since a round 17 or a taper is formed between the outer surface of the cover 9, which is the outer surface of the transfer case 3, and the inner hole 15a of the cylindrical portion 15, the fitting portion 5a of the one-way valve 5 is placed in the transfer case 3. It becomes a guide for an inlet when press-fitting into the mounting hole 7 from the outside, and can be easily attached by press-fitting.

  The cylindrical portion 15 has a tapered shape whose overall shape is tapered toward the distal end side in the transfer case 3.

  For this reason, the taper-shaped taper of the whole cylinder part 15 becomes an overall guide when the fitting part 5a of the one-way valve 5 is press-fitted into the mounting hole 7 from the outside of the transfer case 3, and the attachment by press-fitting is easily performed. Can be made.

  The cylindrical portion 15 was formed by burring on a cover 9 constituting a part of the transfer case 3.

  For this reason, formation of the cylinder part 15 can be performed easily. Further, the rigidity of the cover 9 which is a plate material can be improved.

  The cover 9 was fastened and fixed so as to cover the top of the breather chamber 11 of the transfer case 3.

  For this reason, the attachment of the one-way valve 5 to the transfer case 3 can be completed by attaching the cover 9.

[Modification]
FIG. 4 is a cross-sectional view of a main part according to a modification.

  In this modified example, a description will be given by adding A to the same reference numerals of corresponding components. The breather member is a breather pipe 5A as a cylindrical member, and the breather pipe 5A is connected to the cylinder portion 15A from the mounting hole 7A. The end 5Aa is press-fitted.

  A sealant can be filled between the round 17A of the mounting hole 7A and the flange 5Ab of the breather pipe 5A.

  5 and 6 relate to the second embodiment of the present invention, FIG. 5 is a side view of the power transmission device, and FIG. 6 is an upper side sectional view of the breather chamber. The basic configuration is the same as that of the first embodiment, and corresponding components are denoted by B with the same reference numerals, and redundant description is omitted.

  The breather mounting structure 6B of the present embodiment is obtained by press-fitting a fitting portion 5Ba of a one-way valve 5B, which is a breather member, from a mounting hole 7B into a cylindrical portion 15B.

  The steel plate cover 9B is welded and fixed to the upper edge of the breather chamber 11B of the transfer case 3B by aluminum die casting.

  Therefore, the present embodiment can achieve the same effects as the first embodiment while reducing the number of parts.

It is a side view of a power transmission device. (Example 1) It is upper part sectional drawing of a breather chamber. (Example 1) It is an expanded sectional view of a cylinder part. (Example 1) It is a side view of a power transmission device. (Example 2) It is upper part sectional drawing of a breather chamber. (Example 2) It is an expanded sectional view around a cylinder part. (Example 2)

Explanation of symbols

1,1B transfer device 3,3B transfer case (casing)
5,5B One-way valve (Breaser component)
5A breather pipe (breather member, cylindrical member)
6,6B Breather mounting structure 7,7A, 7B Mounting hole 9,9B Cover (plate material)
11, 11B breather chamber 15, 15B cylinder 17, 17B are

Claims (7)

A breather mounting structure in which a breather member for adjusting an internal pressure in the casing is press-fitted and supported in a mounting hole of a casing having an internal pressure variation,
A cylindrical portion for securing the length of the press-fitting in the mounting hole is integrally projected to the inside of the casing.
Breather mounting structure characterized by that. The breather mounting structure according to claim 1,
Between the outer surface of the casing and the inner hole of the cylindrical portion, a round or taper was formed,
Breather mounting structure characterized by that. The breather mounting structure according to claim 1 or 2,
The cylindrical portion has a taper that is tapered toward the tip side in the casing.
Breather mounting structure characterized by that. The breather mounting structure according to claim 1,
The cylindrical portion is formed by burring on a plate material constituting a part of the casing.
Breather mounting structure characterized by that. The breather mounting structure according to claim 4,
The plate material is fixed by welding or fastening to the casing,
Breather mounting structure characterized by that. The breather mounting structure according to claim 1,
The breather member is a one-way valve or a cylindrical member.
Breather mounting structure characterized by that. The breather mounting structure according to claim 1,
A gear for power transmission is provided inside the casing.
A power transmission device characterized by that.

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