JP3293145B2 - Lubrication device in final reduction gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device in a final reduction gear, and more particularly, to a lubricating device having a ring gear meshing with a drive pinion of a drive shaft and a differential housing having an axle shaft mounted through a differential side bearing. The present invention relates to a lubrication device in a final reduction gear that is supported by a differential carrier.

[0002]

2. Description of the Related Art A driving force of an internal combustion engine mounted on a vehicle such as an automobile, for example, a vehicle of a front-wheel-drive internal-combustion engine rear-wheel drive system is converted into a desired torque and rotation speed by a transmission and taken out. And transmitted to the left and right axle shafts respectively by the final reduction gears via the gears to drive the left and right wheels.

In the final reduction gear, one end of a drive shaft is connected to a propulsion shaft, and a drive pinion is fixedly mounted on the other end of the drive shaft, and the drive pinion meshes with a ring gear. This ring gear is fixed to the differential housing.

In this differential housing, first and second differential pinions supported by a differential pinion shaft are mounted. First and second differential side gears mesh with the first and second differential pinions. The first and second differential side gears are respectively connected to first and second axle shafts oriented in the left-right direction of the vehicle.

The differential housing is supported by first and second differential side bearing bosses of the differential carrier via first and second differential side tapered roller bearings as differential side bearings. Outside the first and second differential side tapered roller bearings, first and second differential side oil seals for performing oil sealing between the first and second axle shafts and the differential carrier are disposed, respectively.

[0006] Such a final reduction gear is disclosed, for example, in Japanese Utility Model Publication No. 59-39231.
This final reduction gear is particularly related to a drive pinion interposed between a ring gear and a propeller shaft, and has a centering projection on a surface of the solid head pinion on the drive pinion shaft side. A drive pinion shaft that is hollow and has a flange separate from the pinion,
The drive pinion shaft is welded in such a state that the inner diameter surface of one end on the flange side is fitted to the outer diameter surface of the centering projection and the end surface of the flange is provided on the end surface of the drive pinion shaft. is there.

[0007]

By the way, in the conventional lubricating device in the final reduction gear, the drive pinion is rotated in a predetermined direction, power is transmitted to the ring gear to rotate the ring gear, and the drive pinion and the ring gear rotate. The lubricating oil in the differential carrier was splashed, and the lubricating oil was supplied to the first and second differential side tapered roller bearings and the first and second differential side oil seals.

However, the first and second differential side tapered roller bearings are provided inside the first and second differential side oil seals, and the first and second differential side tapered roller bearings are provided only by rotation of the drive pinion and the ring gear. It is difficult to supply lubricating oil to the second differential side oil seal, which is disadvantageous in practical use.

[0009]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides a method in which a ring gear meshing with a drive pinion of a drive shaft is mounted so as to be biased to one side on the center line extension of the drive shaft. A lubricating device in a final reduction gear that is supported by a differential carrier via a pair of left and right differential side bearings and has a differential housing to which left and right axle shafts are attached, the differential carrier having a differential carrier cover at one end. Differential oil seals are respectively provided between the left and right axle shafts outside the differential side bearing and the differential carrier, and the differential carrier between the differential side oil seal and the differential side bearing is opened to the differential carrier cover side to open each differential. Each differential side groove reaching the side oil seal is provided A pair of lubricating oil guides are provided on the inner wall surface of the differential carrier cover and extend from the central portion to the respective differential side grooves, and the pair of lubricating oil guides is one of lubricating oil guides located on the side close to the ring gear. And a lubricating oil guide portion located on a side away from the ring gear is connected to a lower side of the other differential side groove.

[0010]

According to the invention described above, when the final reduction gear is driven, the drive pinion rotates, transmitting power to the ring gear meshing with the drive pinion, rotating the differential housing, and transmitting power to the axle shaft. While transmitting, the ring gear follows the lubricating oil in the differential carrier. At this time, the lubricating oil carried around by the ring gear flows upward from below on the inner wall surface side of the differential carrier cover close to the ring gear, and flows downward from above on the inner wall surface away from the ring gear of the differential carrier cover. Instead, it flows downward from above with the ring gear. As a result, the lubricating oil flowing upward from the inner wall surface of the differential carrier cover on the side close to the ring gear flows along the lower side of the lubricating oil guide disposed so as to communicate with the upper side of one of the differential side grooves. It is guided in the direction of the differential side groove, flows in, and is supplied to one differential side oil seal. Also, the lubricating oil flowing from the upper side to the lower side on the inner wall surface of the differential carrier cover on the side away from the ring gear flows along the upper side of the lubricating oil guide portion disposed so as to communicate with the lower side of the other differential side groove. It is guided in the groove direction, flows in, and is supplied to the other differential side oil seal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a final reduction gear provided in the vehicle, 4 denotes a differential carrier, and 6 denotes a drive shaft. One end of the drive shaft 6 is connected to a propulsion shaft (not shown). The drive shaft 6 is supported by a front tapered roller bearing 8 and a rear tapered roller bearing 10 in a differential carrier 4, and is connected to a vehicle (not shown). ). A spacer 12 is provided between the front and rear tapered roller bearings 8 and 10. Further, the differential carrier 4 has a differential carrier cover 38.

A drive pinion 14 is fixedly mounted on the other end of the drive shaft 6, and the drive pinion 14 meshes with a ring gear 16. The ring gear 16 is attached to a differential housing 18 by a ring fixing bolt 20.
Has been fixed by.

In the differential housing 18, first and second differential pinions 24-supported on a differential pinion shaft 22 are provided.
1, 24-2 are attached. First and second differential side gears 26-1 and 26-2 mesh with the first and second differential pinions 24-1 and 24-2, respectively. The first and second differential side gears 26-1 and 26-2 are connected to first and second axle shafts 28-1 and 28-2, respectively, which are oriented in the left-right direction of a vehicle (not shown). .

The ring gear 16 is fixed to the differential housing 18 so as to be deviated to one side on the extension of the center line of the drive shaft 6 and deviated to the lower first axle shaft 28-1 side in FIG. .

The differential housing 18 is provided with first and second differential side bearing boss portions 32 of the differential carrier 4 via first and second differential side tapered roller bearings 30-1 and 30-2 which are a pair of left and right differential side bearings. -1, 32-
2 supported. Outside the first and second differential side tapered roller bearings 30-1 and 30-2, the first and second differential side tapered roller bearings 30-1 and 30-2 are provided.
First and second differential side oil seals 34-1 and 34-2 for performing an oil seal between the second axle shafts 28-1 and 28-2 and the differential carrier 4 are provided, respectively.

As shown in FIGS. 3 and 4, the differential carrier 4 has first and second first and second differential side oil seals 34-1 and 34-2 which open toward the differential carrier cover 38 and reach the first and second differential side oil seals 34-1 and 34-2. The differential side grooves 36-1 and 36-2 are provided.

As shown in FIG. 2, the differential carrier 4 is provided with lubricating oil which is entrained by the ring gear 16 and is provided on the inner wall surface 4 of the differential carrier cover 38 of the differential carrier 4.
0, the first and second differential side oil seals 34
-1, 34-2, the differential carrier cover 38
A pair of lubricating oil guides, for example, ribs 42 utilizing a rib structure, are provided on the inner wall surface 40 from the center to the first and second differential side grooves 36-1 and 36-2.

More specifically, the differential carrier cover 38
In FIG. 2, the shape of the rib portion 42 provided from the right end on the first axle shaft 28-1 side to the left end on the second axle shaft 28-2 side in FIG. 1, the first rib portion 42-1 is disposed above the first differential side groove 36-1 on the side of the ring gear 16 located on the side of the first axle shaft 28-1. Differential housing 1 located on 28-2 side
On the 8th side, the second rib portion 42-2 is disposed below the second differential side groove 36-2. That is, the pair of rib portions 42 are arranged so that the first rib portion 42-1 located on the side close to the ring gear 16 communicates with the upper side of the one first differential side groove 36-1. The second rib portion 42-2 located on the side to be separated is provided so as to communicate with the lower side of the other second differential side groove 36-2. In the present invention, the rib structure is shown as an example. However, considering the purpose of guiding the lubricating oil entrained by the ring gear 16 to the first and second differential side grooves 36-1 and 36-2, It is not always necessary to use a rib structure, and for example, a step portion may be provided instead of the rib portion 42.

Next, the operation will be described.

When the internal combustion engine is driven (not shown), the drive pinion 14 rotates, transmitting power to the ring gear 16 meshing with the drive pinion 14, rotating the differential housing 18, and Second axle shaft 28
-1 and 28-2, and the ring gear 16 carries the lubricating oil in the differential carrier 4 with it.

The ring gear 16 is fixed to the differential housing 18 so as to be deviated to one side on the extension of the center line of the drive shaft 6 and deviated to the lower first axle shaft 28-1 side in FIG. .

As a result, when the ring gear 16 and the differential housing 18 rotate in the direction of arrow A, the differential carrier 4
On the first axle shaft 28-1 side, the lubricating oil is splashed upward by the ring gear 16, while on the second axle shaft 28-2 side in the differential carrier 4, the lubricating oil is raised by the differential housing 18. I can jump up.

At this time, the lubricating oil is supplied to the second axle shaft 28
-2 side than the outer peripheral surface of the differential housing 18
The ring gear 16 is more greatly taken on the outer peripheral surface of the ring gear 16 located on the first axle shaft 28-1 side. Accordingly, the lubricating oil flows upward from below on the first inner wall surface 40-1 side of the differential carrier cover 38, as shown by the arrow in FIG. 2, and on the second inner wall surface 40-2 side of the differential carrier cover 38. Does not flow upward from below, but flows downward from above along with the ring gear 16.

The ring gear 16 of the differential carrier cover 38
The lubricating oil flowing from the lower side to the upper side on the first inner wall surface 40-1 on the side close to the first rib portion 42-1 is disposed so as to communicate with the upper side of the first first differential side groove 36-1. It is guided along the lower side in the direction of the first differential side groove 36-1 and flows in, and is supplied to the first differential side oil seal 34-1. Further, the lubricating oil flowing from the upper side to the lower side on the second inner wall surface 40-2 of the differential carrier cover 38 on the side away from the ring gear 16 is disposed so as to communicate with the lower side of the other second differential side groove 36-2. Along the upper side of the provided second rib portion 42-2, it is guided and flows in the direction of the second differential side groove 36-2, and is supplied to the second differential side oil seal 34-2. In this way, the lubricating oil that flows is collected by the ribs 42 and then the first and second ribs 42-1 and 42-2.
Along the first and second differential side grooves 36-1, 36-
It is guided in two directions, flows in, and is supplied to the first and second differential side oil seals 34-1 and 34-2, respectively.

Thus, the first and second sides of the differential carrier cover 38 between the side close to the ring gear 16 and the side away from it are separated.
Lubricating oils having different flow directions can be appropriately collected and supplied to the first and second differential side oil seals 34-1 and 34-2 on the inner wall surfaces 40-1 and 40-2, respectively. The lubricating performance can be improved by improving the supply of the lubricating oil to the two differential side oil seals 34-1 and 34-2, and the first and second differential side oil seals 34-1 and 34-2 can be improved.
2 can be extended in service life, which is economically advantageous.

Further, since the rib portion 42 can be integrally formed on the inner wall surface 40 of the differential carrier cover 38, the structure is not complicated, the production is easy, and the cost can be reduced.
Economically advantageous.

[0028]

As described above in detail, according to the present invention, the differential carrier is provided for guiding the lubricating oil with which the ring gear rotates to the differential side oil seal provided between the differential carrier and the axle shaft outside the differential side bearing. A pair of lubricating oil guides provided on the inner wall surface of the cover are arranged so that the lubricating oil guide located on the side close to the ring gear is connected to the upper side of one of the differential side grooves and located on the side separated from the ring gear. By disposing the lubricating oil guide to communicate with the lower side of the other differential side groove,
The lubricating oil flowing upward from below on the inner wall surface of the differential carrier cover adjacent to the ring gear is guided along the lower side of one lubricating oil guide in the direction of the differential side groove and supplied to the differential side oil seal. Further, the lubricating oil flowing from the upper side to the lower side on the inner wall surface of the differential carrier cover away from the ring gear is guided along the upper side of the other lubricating oil guide portion in the direction of the differential side groove to the other differential side oil seal. Can be supplied. For this reason, it is possible to appropriately collect and supply lubricating oils having different flow directions to the respective differential side oil seals on the respective inner wall surfaces on the side of the differential carrier cover close to the ring gear and on the side separated from the ring gear,
Lubricating oil can be supplied to the differential side oil seal in a favorable manner, and the lubricating performance can be improved. The service life of the differential side oil seal can be extended, which is economically advantageous.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lubricating device in a final reduction gear transmission showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 1;

[Explanation of symbols]

 2 Final reduction gear 4 Differential carrier 6 Drive shaft 14 Drive pinion 16 Ring gear 18 Differential housing 24-1 First differential pinion 24-2 Second differential pinion 26-1 First differential side gear 26-2 Second differential side gear 28-1 First axle shaft 28-2 Second axle shaft 30-1 First differential side tapered roller bearing 30-2 Second differential side tapered roller bearing 34-1 First differential side oil seal 34-2 Second differential side oil seal 36-1 First differential side groove 36-2 second differential side groove 38 differential carrier cover 40 inner wall surface 42 rib 42-1 first rib portion 42-2 second rib portion

Claims (1)

(57) [Claims] 1. A ring gear meshing with a drive pinion of a drive shaft is provided on one side on a center line extension of the drive shaft.
The differential housing of left and right axle shaft is mounted with mounted to bias, in the lubricating device in the final reduction gear is rotatably supported on the differential carrier via a pair of left and right differential side bearing, the differential carrier end section It has a differential carrier cover, de between the differential side bearing the differential side oil seal provided respectively between the outer left and right axle shaft differential carrier than the differential side oil seal and the differential side bearing
Open the differential carrier cover side and open each differential.
Each differential side groove reaching the side oil seal is provided.
From the center to the inner wall of the differential carrier cover.
A pair of lubricating oil guides directed to each differential side groove are provided , and the pair of lubricating oil guides are located near the ring gear.
Lubricating oil guide on one side
And the ring gear
Lubricating oil guide located on the side away from the other
A lubricating device in the final reduction gear, which is provided so as to communicate with a lower side of the id groove .