JPH0671247U - Breather structure of automobile differential - Google Patents

Abstract

(57) [Abstract] [Purpose] When a breather hole is formed in a differential carrier, it is possible to more reliably prevent the lubricating oil from leaking to the outside of the differential carrier through the breather hole. [Structure] Between the front and rear ribs 19 and 20 protruding from the ceiling surface 18 of the differential carrier 2, the ceiling surface 1 of the differential carrier 2 is provided.
The intermediate rib 26 is projected from 8. The breather hole 21 is arranged between the intermediate rib 26 and the rear rib 20. The lower end of the rear rib 20 extends downward from the intermediate rib 26.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a breather structure for an automobile diff, and more specifically, in the case where a breather hole is formed in a diff carrier, lubricating oil scattered in an operating diff carrier does not leak outside through the breather hole. Regarding what you do.

[0002]

[Prior art]

 A conventional breather structure for an automobile differential (differential) is disclosed in Japanese Utility Model Laid-Open No. 1-140065.

According to this, the differential case is rotatably supported in the differential carrier about the lateral axis, and the ring gear is attached to the differential case on the axial center. A pair of front and rear ribs project from the ceiling surface of the differential carrier when viewed in the rotation direction above the differential case, and a breather hole for communicating the inside and outside of the differential carrier is formed on the ceiling surface of the differential carrier between the front and rear ribs.

When the pressure inside the diff carrier fluctuates when the diff operates, the air inside the diff carrier flows through the breather hole to the outside so that the pressure fluctuation is suppressed. Has become.

On the other hand, when the diff operates, the lubricating oil in the diff carrier is scraped up and scattered by the rotation of the diff case and the ring gear, but the lubricating oil is blocked from going to the breather hole by the front and rear ribs. This prevents the lubricating oil from leaking to the outside of the differential carrier.

[0006]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional configuration, a breather hole is provided between the front and rear ribs to prevent the lubricating oil from heading to the breather hole in each of the ribs. Although the portion is a small amount, it may jump between the front and rear ribs, which may cause leakage to the outside of the differential carrier through the breather hole.

[0007]

[The purpose of the device]

 The present invention was made in view of the above circumstances, and when a breather hole is formed in a diff carrier, it is better to prevent the lubricating oil from leaking to the outside of the diff carrier through the breather hole. The purpose is to prevent it surely.

[0008]

[Means for Solving the Problems]

 The feature of the present invention for achieving the above-mentioned object is that an intermediate rib is projected from the ceiling surface of the differential carrier between the front and rear ribs projecting on the ceiling surface of the differential carrier, and the intermediate rib and the The breather hole is provided between the rear rib and the rear rib, and the lower end of the rear rib extends downward from the intermediate rib.

[0009]

[Work]

 The operation of the above configuration is as follows.

An intermediate rib 26 is projected from the ceiling surface 18 of the differential carrier 2 between front and rear ribs 19 and 20 projecting from the ceiling surface 18 of the differential carrier 2, and the intermediate rib 26 and the rear rib 20 are separated from each other. The breather hole 21 is provided between the rear ribs 20 and the lower ends of the rear ribs 20 extend downward from the intermediate ribs 26.

Therefore, when the differential 1 is operated, the differential case 7 and the ring gear 14 rotate (arrow A in FIG. 2), and the lubricating oil 17 in the differential carrier 2 is scraped up and scattered. First, the front and rear ribs 19 and 20 prevent the lubricating oil 17 from going to the breather hole 21.

Further, a part of the scattered lubricating oil 17 tries to jump between the front rib 19 and the rear rib 20 even if the amount is small, but the lubricating oil 17 tries to jump in this way. It is blocked by the extending portion 27 at the lower end of the rear rib 20 (arrow B in FIGS. 1 and 4).

Further, even if the lubricating oil 17 is not blocked by the extending portion 27 and jumps between the front rib 19 and the intermediate rib 26 (arrow C in FIGS. 1 and 4), this lubricating oil 17 is blocked by the intermediate rib 26 to prevent it from going between the rear rib 20 and the intermediate rib 26 (arrow D in FIGS. 1 and 4). Therefore, it is possible to reliably prevent the lubricating oil 17 from going to the breather hole 21 arranged between the rear rib 20 and the intermediate rib 26.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 1 in the drawings is a differential mounted on the automobile, and arrow Fr in the drawings indicates the front of the automobile.

The differential 1 has a differential carrier 2 supported on the stationary side of the vehicle body. The diff carrier 2 is composed of a cast diff carrier main body 3 and a sheet metal diff carrier cover 5 that openably and closably closes an opening 4 formed in the front surface of the diff carrier main body 3.

A differential case 7 is housed in the differential carrier 2. The differential case 7 is supported by the differential carrier 2 via left and right bearings 8 and 8 and is rotatable about a lateral axis 9 extending in the left and right direction (arrow A in FIG. 2). A diff pinion 11 and a diff side gear 12 are supported by the diff case 7, and each diff side gear 12 is connected to the corresponding left and right wheels via axles 13. A ring gear 14 is attached to the differential case 7 on the axis 9.

A drive gear 16 is rotatably supported by a pair of front and rear bearings 15, 15 on the rear portion of the diff carrier main body 3 so as to be rotatable about its axis, and the drive gear 16 is meshed with the ring gear 14.

When the power from the engine is transmitted to the ring gear 14 via the drive gear 16, the ring gear 14 and the differential case 7 rotate integrally around the shaft center 9, whereby the left and right axle shafts are rotated. Equal driving torques are applied to the left and right wheels via the wheels 13 and 13, so that the vehicle can travel forward.

Lubricating oil 17 is accommodated in the differential carrier 2, whereby the meshing portion of each gear is lubricated.

A pair of front ribs 19 and rear ribs 20 project downward from the ceiling surface 18 of the diff carrier main body 3, and these front ribs 19 and rear ribs 20 are arranged in the rotational direction of the upper portion of the differential case 7. Seen, it is arranged in front and back. A breather hole 21 is formed in the ceiling surface 18 between the front rib 19 and the rear rib 20 so as to extend in the axial direction. A nipple 22 is screwed into the breather hole 21. One end of a tube 23 is connected to the nipple 22, and the other end of the tube 23 is extended to a place where rainwater does not enter and is open to the atmosphere here.

When the diff 1 operates, that is, when the diff case 7 and the ring gear 14 rotate, the pressure in the diff carrier 2 fluctuates. In this case, the air 24 in the diff carrier 2 is changed to the breather. By flowing through the hole 21 and the tube 23, the pressure fluctuation in the differential carrier 2 is suppressed.

An intermediate rib 26 projects downward from the ceiling surface 18 of the differential carrier 2 between the front rib 19 and the rear rib 20, and the breather hole is provided between the intermediate rib 26 and the rear rib 20. 21 are provided.

The lower ends of the rear ribs 20 extend downward from the intermediate ribs 26, and the extension portions 27 are formed. In this case, the lower ends of the front rib 19 and the rear rib 20 are located at substantially the same height, and the lower end of the intermediate rib 26 is above the lower ends of the front rib 19 and the rear rib 20. Is located in.

It is assumed that the differential case 7 and the ring gear 14 rotate (arrow A in FIG. 2) by the operation of the differential 1, and the lubricating oil 17 in the differential carrier 2 is scraped up and scattered. At this time, the fact that the lubricating oil 17 is directed to the breather hole 21 is first blocked by the front rib 19 and the rear rib 20, which prevents the lubricating oil 17 from leaking to the outside of the differential carrier 2. It

A part of the scattered lubricating oil 17 tries to jump between the front ribs 19 and the rear ribs 20 even if the amount thereof is small, but the lubricating oil 17 tries to jump like this. It is blocked by the extending portion 27 at the lower end of the rear rib 20 (arrow B 1 in FIGS. 1 and 4). Therefore, the lubricating oil 17 is prevented from heading to the breather hole 21.

Further, even if the lubricating oil 17 is not blocked by the extending portion 27 and jumps between the front rib 19 and the intermediate rib 26 (arrow C in FIGS. 1 and 4), this lubricating oil 17 is blocked by the intermediate rib 26 to prevent it from going between the rear rib 20 and the intermediate rib 26 (arrow D in FIGS. 1 and 4). Therefore, it is possible to more reliably prevent the lubricating oil 17 from going to the breather hole 21 arranged between the rear rib 20 and the intermediate rib 26.

Further, when the differential case 7 and the ring gear 14 reversely rotate (opposite to the arrow A in FIG. 2) and the lubricating oil 17 scatters, the lubricating oil 17 may face the breather hole 21. It is blocked by the rib 19 (arrow E in FIGS. 1 and 4).

It goes without saying that the ribs 19, 20, and 26 function as reinforcing members for the ceiling surface 18.

[0030]

[Effect of device]

 According to this invention, between the front and rear ribs protruding from the ceiling surface of the differential carrier, the intermediate rib is projected from the ceiling surface of the differential carrier, and the breather hole is provided between the intermediate rib and the rear rib. The rear ribs are arranged so that the lower ends of the rear ribs extend downward from the intermediate ribs.

Therefore, when the diff operation causes the diff case and the ring gear to rotate and the lubricating oil in the diff carrier is scraped up and scattered, it is first that this lubricating oil goes to the breather hole. It is blocked by the front and rear ribs.

Further, a part of the scattered lubricating oil tries to jump between the front ribs and the rear ribs even if the amount is small. It is blocked by the extension. Therefore, it is possible to prevent the lubricating oil from going to the breather hole, and to prevent the lubricating oil from leaking to the outside of the differential carrier.

Further, even if the lubricating oil is not blocked by the extending portion and splashes between the front ribs and the intermediate ribs, the lubricating oil is blocked by the intermediate ribs and the intermediate ribs. Attempts to face the ribs are prevented. Therefore, it is more reliably prevented that the lubricating oil goes to the breather hole provided between the rear rib and the intermediate rib, and it is more sure that the lubricating oil leaks to the outside of the differential carrier through the breather hole. Will be prevented.

[Brief description of drawings]

FIG. 1 is a partially enlarged view of FIG.

FIG. 2 is a side sectional view of the differential.

FIG. 3 is a plan sectional view of a differential.

FIG. 4 is a plan view of what is shown in FIG.

[Explanation of symbols]

 1 Differential 2 Differential Carrier 7 Differential Case 9 Shaft Center 14 Ring Gear 17 Lubricating Oil 18 Ceiling Surface 19 Front Rib 20 Rear Rib 21 Breather Hole 24 Air 26 Intermediate Rib 27 Extending Part

Claims (1)

[Scope of utility model registration request] 1. A diff case is rotatably supported in a diff carrier about a lateral axis, and a ring gear is attached to the diff case on the axis, and a pair of front and rear ribs are formed on the diff case when viewed in the rotational direction of the diff case. In a breather structure for an automobile diff, in which a breather hole that projects to the ceiling surface of the carrier and connects the inside and outside of the diff carrier is formed on the ceiling surface of the diff carrier between the front and rear ribs, the breather structure of the diff carrier is formed between the front and rear ribs. An intermediate differential is projected on the ceiling surface, the breather hole is arranged between the intermediate rib and the rear rib, and the lower end of the rear rib is extended downward of the intermediate rib. Breather structure.