JPH0672168A - Lubricating device for transfer - Google Patents

Abstract

PURPOSE:To solve the lubrication shortage of a bearing by improving the shape of existing components utilizing lubricating oil through the agitation of a gear. CONSTITUTION:A first rib 60 receiving lubricating oil through the agitation of a gear 18 is integrally formed at the side face of a draft hole 58 bored in a transfer case 34, and second ribs 62 are integrally formed at both side faces, below the draft hole 58, of the transfer case 34. An oil reservoir 64 of lubricating oil flowing through the first rib 60 and the draft hole 58 is formed by the second ribs 62 and a retainer 52, and lubricaing grooves 66, 68 are formed at the contact face between the transfer case 34 and the retainer 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a four-wheel drive vehicle,
It is related to the lubricator of the transfer that distributes the power from the transmission to the front and rear wheels.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a transferer of a conventional full-time four-wheel drive vehicle.

The transfer 10 is an offset type transferer in which the output shifter 14 is arranged in an offset manner with respect to the input shifter 12.

A center differential 16 and two gears 18 and 20 are arranged on the output shaft 14. Gear 18 is bolt 2 to the differential case 22 of the center differential 16.
4, the gear 20 is rotatably supported on the differential case 22 via a needle bearing 26. And these two gears 18,
A synchronizer 32 is arranged between the 20 and the synchronizer 3
2 operates in synchronization with the gear 20 on the high side, whereby two-stage gear shifting is performed.

The differential case 22 is rotatably supported by a rear transfer case 34 via a tapered roller bearing 36. In addition, a rear extension case 38 is provided on the rear side of the transfer case 34.
Is installed. In the rear extension case 38, an output front shift 28 of the output shift 14 and a rear output shift shaft 30 on the rear side connected via a bevel gear in the differential case 22 are extended from the transfer case 34. A viscous coupling ring 40 is mounted on the output shutter shaft 30. Further, an idler shaft 42 arranged in parallel between the input shaft 12 and the output shaft 14 extends from the transfer case 34, and a lubricating oil pump 44 is mounted on the idler shaft 42. . The lubricating oil pump 44 has an oil passage 46 formed in the rear extension case 38 and the output shaft shaft 14,
The respective lubricated parts on the output shaft 14 were forcibly lubricated via the valve 48.

[0006]

In the above-mentioned prior art, lubrication of the tapered roller bearing 36 is performed, for example, because the tapered roller bearing 36 is located in the concave portion between the differential case 22 and the viscous coupling 40. Splash lubrication is not suitable. For this reason,
Oil passage 4 bored in the outlet shaft 30
The oil hole 50 was bored from 8 to the tapered roller bearing 36, and the lubrication oil pump 44 forcedly lubricated it as described above.

However, the lubrication of the tapered roller bearing 36 is performed because the viscous coupling 40 is adjacent to the differential case 22 located on the inner circumference of the tapered roller bearing 36, so that the spline fitting portion between the differential case 22 and the output shutter shaft 30 is engaged. Most of the lubricating oil from the oil hole 50 located at the position is the viscous coupling 4.
There is a problem that the rotation of 0 causes the oil to flow along the viscous coupling 40, and the amount of lubricating oil in the tapered roller bearing 36 decreases.

Further, due to insufficient lubrication of the tapered roller bearing 36, the retainer 52 and the tapered roller bearing 36 which are fixed to the transfer case 34 located on the outer periphery of the tapered roller bearing 36 by a bolt 56 with a predetermined preload. Since the preload adjusting shim 54 provided between the outer race and the outer race rotates together with the tapered roller bearing 36, there is a problem that the preload shim 54 is worn.

In order to solve the above problem, the amount of lubricating oil is increased. However, since most of the lubricating oil flows along the viscous coupling 40 as in the above, the lubrication of the tapered roller bearing 36 is insufficient. It is also possible to project the outer race in the direction of the viscous coupling 40 so as to receive the lubricating oil, but in this case, since it becomes a special bearing, there is a problem that the cost is increased and the axial length is extended. .

Therefore, it is a technical object of the present invention to improve the shape of conventional components by using lubricating oil generated by agitation of gears to eliminate insufficient lubrication of tapered roller bearings.

[0011]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention has a center differential and a viscous coupling arranged adjacent to each other on an output shaft and a center differential differential case on the rear side. A retainer and a bearing member that are rotatably supported by a bearing member disposed in a recess between the center differential and the viscous coupling with respect to the transfer case and are fixed to the transfer case with a predetermined preload. In a lubricator for a transfer that lubricates the bearing member by interposing a shim for adjusting preload between the outer race and the outer race, lubrication by stirring the gear fixed to the differential case on the side surface of the ventilation hole formed in the transfer case. The first rib that receives oil is integrally formed, and the second rib is integrally formed on both side surfaces of the transfer case below the ventilation hole. An oil reservoir is formed to prevent the lubricating oil received by the first rib by the second rib and the retainer from being blocked by the ventilation hole, and the lubricating oil in the oil reservoir is provided on the contact surface between the transfer case and the retainer. That is, the lubricant is supplied to the bearing member and the preload adjusting shim through the formed lubricating groove.

[0012]

As a result of the above measures, the lubricating oil scraped up by the gear is received by the first rib,
The oil is supplied to the oil sump through the ventilation hole, and from there, the preload adjusting shim and the bearing member can be lubricated through the lubrication groove. Therefore, the lubrication of the preload adjustment shim and the bearing member can be improved by simply changing the rear transfer case and the retainer without adding new parts, and the preload adjustment shim is preferably lubricated. The wear of the preload adjusting shim due to the rotation of the outer race of the member can be suppressed.

[0013]

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

FIG. 1 is a sectional view of a lubricating device for a transfer according to the present invention, and FIG. 2 is a front view of the lubricating device of FIG. 1 as seen from the rear side. It should be noted that the same components as those of the conventional components are designated by the same reference numerals.

As shown in FIGS. 1 and 2, the rear transfer case 34 is provided with a ventilation hole 58 for pressure adjustment inside the transfer case 34. This vent 5
A first rib 60 is formed integrally with the transfer case 34 on the side surface of the No. 8. The first rib 60 is the differential case 2
It is formed only on one side surface of the ventilation hole 58 so that the lubricating oil scraped up by the gear 18 bolted to the 2 can be received. Further, second ribs 62 are formed integrally with the transfer case 34 on both side surfaces of the transfer case 34 which is located below the ventilation hole 58 and extends rearward from the position of the ventilation hole 58. . The second ribs 62 are bolted to the transfer case 34 with a predetermined preload, and form a sump 64 with the retainer 52 that extends from the transfer case 34 in the vertical direction by a predetermined amount. Lubricating grooves 66 and 68 communicating with the preload adjusting shim 54 and the tapered roller bearing 36 are formed on the contact surfaces of the transfer case 34 and the retainer 52, respectively. Therefore, the lubricating oil in the oil sump 64 is supplied to the preload adjusting shim 54 and the tapered roller bearing 36 via the lubricating grooves 66 and 68.

The operation of this embodiment based on the above configuration will be described below.

In FIG. 2, when the output shaft 30 rotates counterclockwise, the vehicle is in a forward traveling state.
In this state, as shown in FIG. 1, the gear 18 scrapes up the lubricating oil in the transfer case 34, and the scraped lubricating oil is received by the first rib 60 on the side surface of the ventilation hole 58. Then, the lubricating oil is supplied to the oil sump 64 through the ventilation hole 58, and lubricates the tapered roller bearing 36 from there through the lubrication grooves 66 and 68. At that time, the preload adjusting shim 54 disposed between the retainer 52 and the outer race 36a can be lubricated at the same time. Therefore,
Tapered roller bearing 36 and shim 5 for adjusting preload
Insufficient lubrication in No. 4 is eliminated, and seizure of bearings and wear of shims are prevented over a long period of time. Further, in the lubrication device for the tapered roller bearing 36 and the preload adjusting shim 54 of the present invention, the first and second ribs 60, 62 are integrally formed on the existing rear transfer case 34, and the transfer case is formed. Since the lubricating grooves 66, 68 are formed on the contact surfaces of the retainer 34 and the retainer 52, it is not necessary to add new parts, and a simple design change is sufficient. Therefore, it is not necessary to change the shape of the bearing.

Further, the conventional oil pump 44 to the oil hole 5
The lubricating oil forcibly guided to 0 is introduced into the differential case 22 and can sufficiently lubricate the center differential 16.

[0019]

As described above, according to the present invention, the lubricating oil scraped up by the gear is received by the first rib and is supplied to the oil sump through the ventilation hole, from which the lubricating groove is formed. Lubricate the preload adjusting shims and bearing members. Therefore, it is possible to improve the lubrication of the preload adjusting shim and the bearing member by simply changing the rear transfer case and the retainer without adding new parts.
Since the preload adjusting shim is preferably lubricated, the wear of the preload adjusting shim due to the rotation of the outer race of the bearing member is suppressed, and the tapered roller bearing can be stably maintained for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a transfer lubricating device according to the present invention.

FIG. 2 is a front view of the lubricating device of FIG. 1 according to the present invention as viewed from the rear side.

FIG. 3 is a cross-sectional view of a prior art transfer of the present invention.

[Explanation of symbols]

 10 Transformer 12 Imput Shaft 14 Output Shutter 16 Center Differential 18 Gear 22 Differential Case 34 Rear Transfer Case 36 Ted Roller Bearing (Bearing Member) 40 Viscous Cup Ring 52 Retainer 54 Preload Adjusting Shim 58 Vent Hole 60 Number 1 rib 62 second rib 64 oil sump 66,68 lubrication groove

Front Page Continuation (72) Inventor Takao Ooi 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor, Yasuo Tanaka 1 Toyota Town, Toyota City, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Claims] 1. A center differential and a viscous coupling are arranged adjacent to each other on an output shaft, and a differential case of the center differential is located between the center differential and the viscous coupling with respect to a rear transfer case. A crusher for preload adjustment is interposed between a retainer, which is rotatably supported via a bearing member arranged in the recess of the bearing, and is fixed to the transfer case with a predetermined preload, and an outer race of the bearing member. In a lubricator for a transfer that lubricates the bearing member,
A first rib is integrally formed on a side surface of a ventilation hole formed in the transfer case to receive lubricating oil due to stirring of a gear fixed to the differential case, and the first rib of the transfer case below the ventilation hole is formed. Second ribs are integrally formed on both side surfaces, and an oil reservoir is provided to dampen the lubricating oil received by the first rib by the second rib and the retainer via the vent hole. A lubricating device for a transfer, wherein lubricating oil is supplied to the bearing member and the preload adjusting shim through a lubricating groove formed on a contact surface between the transfer case and the retainer.