JP6448130B2 - Breather hose fixing structure - Google Patents

Description

  The present invention relates to a breather hose fixing structure for fixing a breather hose provided, for example, in a housing of an automobile transmission.

  Conventionally, when an automobile engine is rotating at a high speed, the air in the transmission housing is warmed and expanded in the transmission. When the engine is changed from a high speed to a low speed, the temperature in the transmission housing decreases. The air in the transmission housing contracts.

  In order to adjust the pressure in such a housing, a breather hose has been conventionally attached to a housing of an automobile transmission. This breather hose communicates the inside of the transmission housing with the outside, and discharges the air inside the housing to the outside and sucks the outside air into the housing according to the state of the transmission. ing.

  In the conventional mounting structure of such a breather hose, the base end portion of the breather hose is connected to the upper portion of the housing, and the distal end portion is used as a downward air release end, and the distal end portion is fixed by a bracket. . And it is performed by covering the opening part in the front-end | tip part of a breather hose with a cap, and suppressing that the lubricating oil in the housing of a transmission is scattered from the front-end | tip opening part.

  This kind of cap is formed so that the opening of the breather hose and the vicinity thereof can be accommodated from the outside, and a communication hole that communicates the inside and outside of the cap with a portion of the cap facing the transmission housing. Has been proposed (for example, see Patent Document 1).

  When the opening at the tip of the breather hose is closed with such a cap, the lubricant sprayed from the breather hose is received by the cap, so that the lubricant is prevented from scattering into the engine room. Yes. Then, the lubricating oil that hits the inner surface of the cap is discharged to the outside of the cap through the communication hole formed in the cap.

  However, the breather hose is routed and fixed by a bracket. If the tip opening of the breather hose is covered with a cap, the number of parts and work man-hours will increase and the unit price will be pushed up. .

  In order to solve this problem, it is conceivable to fix the tip of the breather hose that is open to the atmosphere toward the rib formed on the housing. In this structure, since the lubricant sprayed from the opening of the breather hose adheres to the ribs, it is prevented from splashing into the engine room. Will evaporate.

Japanese Utility Model Publication No. 60-77846

  However, when the tip of the breather hose that is opened to the atmosphere is fixed to the rib, the high-pressure liquid is sprayed onto the outer surface of the housing for cleaning. May enter the interior of the housing and reach the interior of the housing.

  That is, when the tip opening of the breather hose is directed to the rib, when high-pressure liquid is sprayed on the tip from a direction intersecting the axial direction of the tip, the tip is bent due to the flexibility of the hose. Thus, the tip opening is directed to the downstream side of the high-pressure liquid sprayed there. Thus, when the tip opening is directed downstream of the high-pressure liquid to be sprayed, the high-pressure liquid does not enter the breather hose from the tip opening.

  However, when the tip opening of the breather hose is directed to the rib, if high-pressure liquid parallel to the axial direction of the tip is sprayed on the rib in the vicinity of the tip, the high-pressure liquid that rebounds from the rib is released from the tip opening of the hose. If the liquid enters the inside and a large amount of liquid enters, the liquid may flow through the breather hose and reach the inside of the housing.

  The objective of this invention is providing the fixing structure of the breather hose which can prevent the inflow of the liquid to the inside of a breather hose at the time of washing | cleaning which sprays a high pressure liquid.

According to the present invention, the front end of the breather hose whose base end is connected to the housing that contains the lubricating oil is opened to the side wall of the rib formed of the ridge formed on the outer surface of the housing by the bracket. This is an improvement of the fixing structure of the breather hose to be fixed.

The characteristic configuration is that the bracket is provided with a shielding plate that is parallel to the rib and through which the tip of the breather hose passes.

  In this breather hose fixing structure, it is preferable that the shield plate is configured to be able to fix the distal end portion by inserting the distal end portion of the breather hose. In that case, there is a loose insertion hole in which the distal end portion of the breather hose can be loosely inserted. More preferably, a grommet that is formed on the shielding plate and holds the tip of the breather hose loosely inserted into the loose insertion hole is fitted into the loose insertion hole.

  In the breather hose fixing structure according to the present invention, since the shield plate through which the tip of the breather hose penetrates is formed in the bracket, the cleaning is performed by spraying high pressure liquid on the outer surface of the housing, and the tip of the breather hose is axially arranged. When parallel high-pressure liquid is sprayed on the rib in the vicinity of the tip, the high-pressure liquid is blocked by the shielding plate. For this reason, the high-pressure liquid that rebounds from the rib does not enter the inside from the tip opening of the breather hose. Therefore, in the present invention, the inflow of liquid into the breather hose can be prevented at the time of cleaning by spraying high pressure liquid.

  In addition, if the bracket is provided with a grommet, for example, which holds the tip of the breather hose fitted in the loose insertion hole of the main body and loosely inserted into the loose insertion hole, the breather is attached to the grommet. By simply inserting the tip of the hose, it becomes possible to fix the tip of the breather hose to the bracket due to the friction generated between the outer periphery of the tip and the inner periphery of the grommet. can do.

It is a front view which shows the fixation structure of the breather hose of this invention embodiment. It is the sectional view on the AA line of FIG.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the present invention is a breather hose fixing structure in which a breather hose 20 having a base end 20 a connected to a housing 10 is fixed to a distal end portion 20 b opened to the atmosphere via a bracket 30. is there.

  The housing 10 is mounted on a vehicle and contains oil. For example, an engine, a transmission, a transfer, or the like corresponds to this. These increase the temperature by operating, and a plurality of ribs 11 made of ridges for reinforcement and heat dissipation are formed on the outer surface in the vertical and horizontal directions.

  In this embodiment, the transmission housing 10 is illustrated, and a plug-like connector 12 (breather plug) is attached to the top surface side of the housing 10. The connector 12 is provided with a pipe 12 a (FIG. 2) to which the base end portion 20 a of the breather hose 20 is fitted, and the pipe 12 a is configured to communicate with the inside of the housing 10. Then, the base end portion 20 a of the breather hose 20 is fitted and fixed to the pipe 12 a of the connector 12.

  The breather hose 20 is provided in order to release the pressure in the housing 10 to the atmosphere and to prevent the generated oil mist from being scattered. A material that is formed of a soft material and can be freely curved as appropriate according to the convenience of layout or the like is used.

  Here, in order to obtain a desired path formed by the breather hose 20, the breather hose is at least at two locations, that is, the base end portion 20a connected to the housing 10 of the breather hose 20 and the distal end portion 20b opened. 20 must be fixed so that it does not move in the thrust direction (longitudinal direction of the breather hose 20) and the radial direction (twisted direction of the breather hose 20). In other words, if the two positions of the base end portion 20a and the tip end portion 20b of the breather hose 20 are positioned and fixed, the shape and arrangement of the path formed by the breather hose 20 can be made desired.

  Thus, in order to make the path formed by the breather hose 20 as desired, the breather hose 20 is prepared by being cut to a predetermined length, and the base end portion 20 a of the breather hose 20 is attached to the housing 10. It is fixed to the provided connector 12. In the drawing, in order to prevent the subsequent drop-out, the clip 13 that fastens the outer periphery of the base end portion 20a of the breather hose 20 fitted to the pipe 12a is shown. On the other hand, the front end portion 20b serving as an open end is fixed toward the rib 11 formed in the housing 10 by a bracket 30 described in detail below.

  Here, the bracket 30 for fixing the distal end portion of the breather hose 20 to the housing 10 is configured such that the distal end portion 20b can be fixed by inserting the distal end portion 20b of the breather hose 20, and this embodiment is described. The bracket 30 in FIG. 2 has a main body 31 having a loose insertion hole 31a (FIG. 2) into which the tip 20b of the breather hose 20 can be loosely inserted, and is fitted into the loose insertion hole 31a and loosely inserted into the loose insertion hole 31a. And a grommet 32 for holding the tip 20b of the breather hose 20.

  The main body 31 is made by processing a steel plate into a sheet metal, and includes a mounting portion 31b screwed to the housing 10, and a shielding plate 31c whose upper end is continuous with the end edge of the mounting portion 31b and forms a crank shape. In this embodiment, the mounting portion 31b is screwed to the housing 10 in the vicinity of the rib 11. In this case, the shielding plate 31c is located below the base end portion of the breather hose 20, and the shielding plate 31c is the breather hose 20. It is assumed that the attachment portion 31b is attached to the housing 10 so as to be parallel to the rib 11 facing the front end portion 20b.

  The shield plate 31c in which the free insertion hole 31a into which the tip 20b of the breather hose 20 can be loosely inserted is formed in a comparatively large flat plate shape, and the loose insertion hole 31a is formed in the approximate center thereof. To do. And the front-end | tip of the breather hose 20 which penetrated this shielding board 31c is comprised so that the rib 11 may face.

  The grommet 32 fitted into the loose insertion hole 31a of the housing 10 is a donut shape made of an elastic body such as rubber, and a groove 32a (FIG. 2) into which the edge of the loose insertion hole 31a enters the outer periphery. ) Is formed over the entire circumference. The grommet 32 is inserted into the loose insertion groove 31a by inserting the grommet 32 into the loose insertion hole 31a, and the groove edge of the loose insertion hole 31a is inserted into the concave groove 32a. The outer diameter D is smaller than the outer diameter D (FIG. 2).

  On the other hand, the tip 20b of the breather hose 20 is printed with a mark 20c for inserting the tip 20b into the loose insertion hole 31a until a slight gap is formed from the rib 11. Therefore, when the bracket 30 in this embodiment is inserted into the grommet 32 to the mark 20c while plastically deforming the tip 20b of the breather hose 20 so that the outer diameter D is reduced, the outer diameter D is reduced. Friction occurs between the outer periphery of the tip 20b that is to be expanded and restored and the inner periphery of the grommet 32 that is to prevent the outer diameter D from being increased. The frictional hose 20 is configured to be fixed to the bracket 30 with the tip 20b of the breather hose 20 facing the rib 11 formed on the housing 10 by this friction.

  Next, assembly of the transmission having such a breather hose fixing structure will be described.

  In this transmission assembly, a large number of gears are accommodated in the housing 10, and in the final stage of the assembly, the transmission housing 10 is filled with lubricating oil for lubricating these gears.

  The breather hose 20 is prepared by being cut to a predetermined length, and the base end portion 20a of the breather hose 20 is fitted to the pipe 12a of the connector 12 provided in the housing 10 to prevent subsequent dropout. Fasten with clip 13.

  A bracket 30 is attached to the housing 10. The bracket 30 is attached by screwing the attachment portion 31b of the bracket 30 to the housing 10 adjacent to the rib 11. The shield plate 31c is made parallel to the rib 11 and formed on the shield plate 31c. The loose insertion hole 31 a is positioned below the base end portion 20 a of the breather hose 20.

  A grommet 32 is fitted in the loose insertion hole 31 a of the housing 10. In this fitting, the grommet 32 is inserted into the loose insertion hole 31a, and the hole edge of the loose insertion hole 31a is caused to enter the concave groove 32a formed in the periphery. Thereby, the grommet 32 is fitted in the loose insertion hole 31a.

  Then, the tip 20b of the breather hose 20 is inserted into the grommet 32 up to the mark 20c, and a rib formed on the housing 10 of the breather hose 20 due to friction generated between the outer periphery of the tip 20b and the inner periphery of the grommet 32. 11 is fixed to the bracket 30.

  In the breather hose fixing structure according to the present invention, since the shield plate 31c through which the tip 20b of the breather hose 20 passes is formed in the bracket 30, the breather hose is at the time of cleaning for spraying high pressure liquid onto the outer surface of the housing 10. When high pressure liquid parallel to the axial direction of the tip portion 20b of the 20 is sprayed on the rib in the vicinity of the tip portion 20b, the high pressure liquid is blocked by the shielding plate 31c as shown by the broken arrow in FIG. It does not reach the rib 11 near 20b. For this reason, the high-pressure liquid that rebounds from the ribs 11 does not enter the inside of the breather hose 20 from the front end opening, and the liquid circulates inside the breather hose 20 and reaches the inside of the housing 10. This can be prevented.

  When the high pressure liquid is ejected toward the rib 11 in the vicinity of the distal end portion 20b of the breather hose while avoiding the shielding plate 31c, the ejected high pressure liquid flows from the direction intersecting the axial direction of the distal end portion 20b to the distal end portion. 20b will be sprayed. Then, although not shown, since the breather hose 20 has flexibility, the tip 20b is bent by the liquid sprayed from the direction intersecting the axial direction, and the high-pressure liquid sprayed by the tip opening is applied thereto. It will turn to the downstream side. Thus, when the tip opening is directed to the downstream side of the high-pressure liquid sprayed, the high-pressure liquid does not enter the breather hose 22 from the tip opening.

  Therefore, in the breather hose fixing structure of the present invention, the inflow of liquid into the breather hose 20 can be surely prevented during cleaning with spraying high-pressure liquid.

DESCRIPTION OF SYMBOLS 10 Housing 20 Breather hose 20a Base end part 20b Tip part 30 Bracket 31a Free insertion hole 31c Shielding plate 32 Grommet

Claims (3)

A breather hose (20) having a base end (20a) connected to a housing (10) containing lubricating oil therein is formed on the outer surface of the housing (10) to be opened to the atmosphere. In the structure for fixing the breather hose to be fixed by the bracket (30) toward the side wall of the rib (11) made of ridges ,
A structure for fixing a breather hose, characterized in that a shielding plate (31c) parallel to the rib (11) and through which the tip of the breather hose (20) passes is provided in the bracket (30) . The structure for fixing a breather hose according to claim 1, wherein the shielding plate (31c) is configured to be able to fix the distal end portion (20b) by inserting the distal end portion (20b) of the breather hose (20).   The breather hose (20) in which a free insertion hole (31a) into which a distal end portion (20b) of the breather hose (20) can be loosely inserted is formed in a shielding plate (31c) and loosely inserted into the free insertion hole (31a). The breather hose fixing structure according to claim 2, wherein a grommet (32) for holding the distal end (20b) is fitted into the loose insertion hole (31a).

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