JPH04249658A - Lubricating device for trans axle - Google Patents

Abstract

PURPOSE:To improve the lubrication performance for each bearing by installing an oil introducing wall part connected with an oil flowing groove and a retainer inner peripheral groove at the inner peripheral part of a retainer and continuously forming an oil guide part which can adjust the oil quantity supplied into the first and second bearings, on the oil introducing wall part. CONSTITUTION:As for the trans axle 2 of a four-wheel drive vehicle, the front side outer wheel 48 of a front side conical roller bearing 8 and the rear side outer wheel 54 of a rear side conical roller bearing 40 which support a transfer pinion shaft 30 in free revolution are held by a retainer 56. On the retainer 56, an oil flowing groove 62 for allowing the oil splashed up by the revolution of a transfer drive bevel gear and a transfer bevel pinion gear 28 onto each conical roller bearing 38, 40 to flow is formed. In this case, an oil introducing wall part 74 which is continuous to the oil flowing groove 62 and a retainer inner peripheral groove 75 is installed on the inner peripheral part of the retainer and an oil guide part 76 which can adjust the oil quantity supplied into each conical roller bearing 38, 40 is continuously formed on the oil introducing wall part 74.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a transaxle lubrication system, and more particularly to a transaxle lubrication system that can satisfactorily lubricate two bearings that rotatably support a gear shaft.

0002

2. Description of the Related Art A four-wheel drive vehicle (4WD) is equipped with a power transmission device that transmits driving force input from an internal combustion engine from an output shaft of a transaxle to a propulsion shaft. The transaxle consists of a clutch part, transmission gear part, differential part,
It consists of a transfer section, etc.

As shown in FIG. 7, the transfer portion 102 of the transaxle has a transfer bevel pinion gear 104 fixed to a transfer pinion shaft 106 that meshes with a transfer drive bevel gear (not shown) fixed to a transfer intermediate shaft.

The transfer pinion shaft 106 has a front tapered roller bearing 108 which is the first bearing on the transfer bevel pinion gear 104 side, and a front tapered roller bearing 10.
It is rotatably supported by a rear tapered roller bearing 110 which is a second bearing located apart from the rear tapered roller bearing 8 . A spacer 112 is provided on the transfer pinion shaft 106 between the front tapered roller bearing 108 and the rear tapered roller bearing 110.
is interposed.

The front tapered roller bearing 108 includes a front inner ring 114 in contact with the transfer pinion shaft 106, a front tapered roller 116 provided on the outer surface of the front inner ring 114, and a front outer ring 118 provided on the outer surface of the front tapered roller 116. .

The rear tapered roller bearing 110 includes a rear inner ring 120 in contact with the transfer pinion shaft 106, a rear tapered roller 122 provided on the outer surface of the rear inner ring 120, and a rear tapered roller 122 provided on the outer surface of the rear tapered roller 122. It consists of a side outer ring 124.

Front outer ring 118 of front tapered roller bearing 108
and the rear outer ring 124 of the rear tapered roller bearing are the retainer 12 attached to the transaxle case (not shown).
6. Therefore, a bearing holding hole 128 is formed in this retainer 126, as shown in FIG.

[0008] This retainer 126 is formed with an oil flow groove 130 for flowing oil that is scooped up by the rotation of the transfer drive bevel gear and the transfer bevel pinion gear 104 in the front tapered roller bearing 108 and the rear tapered roller bearing 110. .

The oil flow groove 130 is formed on the retainer end face 13 perpendicular to the axis C of the transfer pinion shaft 106.
2 and is formed by a groove inner surface 134 that is continuous and inclined toward the axis C side.

Further, this oil flow groove 130 communicates with a retainer inner circumferential groove 136 formed in the circumferential direction, thereby forming an oil guiding wall portion 138 having a length L. This retainer inner circumferential groove 136 has a rear tapered roller bearing 110.
A rear bearing oil circulation hole 140 is formed which communicates with the mouth of the bearing.

The retainer 126 is held in the transaxle case by fixing a retainer flange 142 to the transaxle case (not shown).

The transfer pinion shaft 106 is also provided with a propulsion shaft connecting flange 144 by spline connection.
A shaft coupling tube portion 146 is provided so as to be movable in the axial direction and non-rotatable.

The propulsion shaft connecting flange 144 is fixed to the transfer pinion shaft 106 by screwing a nut 148 onto the end of the transfer pinion shaft 106.

An oil seal body 148 is provided between the retainer 126 and the shaft coupling pipe portion 146 to prevent oil from flowing out.
is interposed.

A connecting portion cover 150 is provided at the tip of the retainer 126 to cover a continuous portion of the transfer pinion shaft 106 and the propulsion shaft connecting flange 144. In addition, in FIG. 8, the code|symbol 152 is a meat stealth part.

[0016] Furthermore, the structure of the transaxle is as follows:
For example, it is disclosed in Japanese Patent Publication No. 62-51765. The device described in this publication meshes the drive pinion shaft and ring gear in the final reduction section with appropriate tooth contact and backlash in the tooth depth and tooth trace directions, and This system efficiently transmits power to the axle shaft side and reduces noise caused by proper engagement between the drive pinion shaft and the ring gear.

[0017]

However, as described above, the oil scraped up by the rotation of the transfer drive bevel gear and the transfer bevel pinion gear is received by the jaws on the end face of the retainer and flows into the oil flow groove, and the oil is collected by the front tapered roller. In the structure for lubricating the bearing and the rear tapered roller bearing, the mouth of the oil flow groove is angular, so there is a problem that oil cannot flow smoothly into the oil flow groove.

[0018] Furthermore, the oil guided into the oil flow groove falls into the retainer inner peripheral groove of the retainer, and most of the oil is sucked out to the front tapered roller bearing, resulting in the inconvenience that the rear tapered roller bearing is not lubricated. was there.

Furthermore, since the lower surface of the oil flow groove (near the central portion of the retainer) is horizontal, oil easily falls into the inner circumferential groove of the retainer, and moreover, this fallen oil can be used effectively. There was an inconvenience that it was not possible.

Furthermore, since it is not possible to adjust the amount of oil to the front tapered roller bearing and the amount of oil to the rear tapered roller bearing, there is an inconvenience that the lubrication condition for both bearings becomes unstable. .

[0021]

[Means for Solving the Problems] Therefore, in order to eliminate the above-mentioned disadvantages, the present invention provides a first gear shaft that rotatably supports a gear shaft on which one gear of a pair of meshing gears is provided.
, the second bearings are arranged apart from each other, and the oil scraped up by the rotation of the pair of gears is made to flow into the oil flow groove of the retainer in which the first and second bearings are held.
, in a transaxle lubricating device for lubricating a second bearing, an oil guiding wall part that is continuous with the oil flow groove and the retainer inner peripheral groove is provided at the inner circumferential portion of the retainer, and the oil guiding wall part is provided with the oil guiding wall part that is continuous with the oil flow groove and the retainer inner circumferential groove. The present invention is characterized in that an oil guide part is provided in series to enable adjustment of the amount of oil to the first bearing and the amount of oil to the second bearing.

[0022]

According to the structure of the present invention, the oil scraped up by the rotation of the gear is guided from the oil flow groove to the oil guiding portion via the oil guiding wall portion. By changing the oil guide start position of this oil guide part as desired, the amount of oil to the first bearing and the amount of oil to the second bearing can be adjusted, thereby effectively lubricating both bearings. can.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail and specifically below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. In the diagram, 2 is a four-wheel drive vehicle (4WD vehicle)
transaxle. The transaxle 2 includes a clutch section 4 that connects and disconnects the driving force from an internal combustion engine (not shown) installed horizontally at the front of the vehicle body, a main shaft 6 provided with a plurality of gear trains, and a main shaft 6 provided with a plurality of gear trains. A speed change gear unit 10 having a counter shaft 8 provided with a gear train, a reduction drive gear 12 of a reduction gear mechanism provided on the counter shaft 8, and a reduction drive gear 12 meshing with the reduction drive gear 12 and fixed to the differential case 14. a front differential section 18 connected to the speed change gear section 10 by a driven gear 16; and a transfer drive gear 20 meshed with the reduction driven gear 16.
The transfer section 24 includes a transfer intermediate shaft 22 to which a transfer intermediate shaft 22 is fixedly attached.

This transfer section 24 includes a transfer drive bevel gear 2 provided on the transfer intermediate shaft 22.
A transfer bevel pinion gear 28 meshes with the transfer pinion shaft 3 which is substantially orthogonal to the transfer intermediate shaft 22.
It is configured by being fixed to 0.

A shaft coupling tube portion 34 of a propulsion shaft coupling flange 32 is provided on the transfer pinion shaft 30 by spline coupling so as to be movable in the axial direction but not rotatable.

The propulsion shaft connecting flange 32 is fixed to the transfer pinion shaft 30 by screwing a nut 36 onto the end of the transfer pinion shaft 30.

In the transfer section 24, the transfer pinion shaft 30 includes a front tapered roller bearing 38, which is a first bearing on the transfer bevel pinion gear 28 side, and a first tapered roller bearing 38 located rearwardly away from the front tapered roller bearing 38. 2
It is rotatably supported by a rear tapered roller bearing 40 which is a bearing.

A spacer 42 is provided on the transfer pinion 30 between the front tapered roller bearing 38 and the rear tapered roller bearing 40.
is interposed.

The front tapered roller bearing 38 includes a front inner ring 44 that is in contact with the transfer pinion shaft 30 and a front inner ring 44 that is in contact with the transfer pinion shaft 30.
The front tapered roller 46 provided on the outer surface of the front tapered roller 4
6 and a front outer ring 48 provided on the outer surface of the wheel.

The rear tapered roller bearing 40 includes a rear inner ring 50 in contact with the transfer pinion 30, a rear tapered roller 52 provided on the outer surface of the rear inner ring 50, and a rear tapered roller 52.
and a rear outer ring 54 provided on the outer surface of the rear outer ring 54.

The front outer ring 48 of the front tapered roller bearing 38 and the rear outer ring 54 of the rear tapered roller bearing 40 are connected to the retainer 50.
held by. This retainer 56 is provided with a retainer flange 60 that is fixed to a transfer case 58 that is a part of the transaxle case.

This retainer 56 has a front tapered roller bearing 38, a rear tapered roller bearing 40, a transfer drive bevel gear 26, and a transfer bevel pinion gear 2.
An oil flow groove 62 is formed in which the oil scraped up by the rotation of 8 flows.

The oil flow groove 62 is formed by a groove inner surface 66 that is continuous with a retainer end surface 64 that is substantially perpendicular to the axis C of the transfer pinion 30 and is inclined toward the axis C.

As shown in FIG. 4, the retainer 56 forming the oil flow groove 62 has a radius 70 formed therein to smoothly introduce oil into the oil introduction port 68 of the oil flow groove 62. There is.

In addition, a protrusion 7 is provided on the side surface of the groove inner surface 66.
2 is formed. This protrusion 72 is located, for example, approximately at the center of the front tapered roller bearing 38 and the rear tapered roller bearing 40.

The retainer 56 is also formed with an oil guide wall 74 that is an oil shelf and has a length L1 so as to be continuous with the oil inlet 68 and extend to the position of the rear tapered roller bearing 40. The oil guiding wall portion 74 extends beyond the retainer inner circumferential groove 75 formed in the circumferential direction to the mouth of the rear tapered roller bearing 40 .

A lip-shaped oil guide portion 76 with a length L 2 is provided at the lower end of the oil guide wall portion 74 in the central portion side, and extends in the direction of the axis C of the transfer pinion shaft 30 and toward the center of the oil flow groove 62 . It is installed with a slight protrusion.

Oil guide starting point P of this oil guide section 76
is located on the same line as the protrusion 72.

An oil seal body 78 is interposed between the retainer 56 and the shaft coupling pipe portion 34 to prevent oil from flowing out. In addition, at the tube end portion of the retainer 56,
Transfer pinion shaft 30 and propulsion shaft connection flange 3
A connection part cover 80 is provided to cover the connection part with 2. In addition, in FIG. 3, the reference numeral 82 is a portion where the flesh is removed.

Next, the operation of this first embodiment will be explained.

The oil scraped up by the rotation of the transfer drive bevel gear 26 and the transfer bevel pinion gear 28 reaches the oil inlet 68 of the oil flow groove 62, and a roundness 72 is formed in the retainer 56 of this oil inlet 68. As a result, oil is smoothly guided into the oil flow groove 62.

Since the oil in this oil inlet 68 is guided by the oil guiding wall 74 that is continuous with this oil inlet 68 and flows, it is difficult to fall into the inner peripheral groove 75 of the retainer, and the oil flows on the rear tapered roller bearing 40 side. It flows to.

At this time, the oil guide starting point P of the protrusion 72 and the oil guide portion 76 is located approximately at the center of the oil flow groove 62.
By matching and existing, the rear tapered roller bearing 38
Therefore, the amount of oil flowing to the rear tapered roller bearing 40 can be increased.

Furthermore, since a large roundness is formed from the lower part of the oil guiding wall 74 to the retainer inner circumferential groove 75 of the retainer 56, oil spilled from the oil guiding wall 74 flows between the front tapered roller bearing 38 and the rear conical roller bearing 38. The rotation of the spacer 42 between the roller bearings 40 smoothly guides the oil on the oil guiding wall portion 74 again, preventing oil from stagnation between the retainers 56 and making effective use of the oil.

[0046] As a result, the transfer pinion shaft 30
A front tapered roller bearing 38 and a rear tapered roller bearing 4 that support the
It is possible to perform well-balanced lubrication with zero and prevent seizures and the like from occurring.

FIGS. 5 and 6 show a second embodiment of the invention. In this second embodiment, parts having the same functions as those in the above-described first embodiment are given the same reference numerals and explained.

The features of this second embodiment are as follows. That is, the groove inner surface 66 of the oil flow groove 62 formed in the retainer 56 is formed on a straight line. Also,
The oil guide part 76 has an oil guide starting end P connected to the retainer 56.
It is formed to have a length L3 so as to be close to the outer edge side of the roller bearing and to be located substantially entirely between the front tapered roller bearing 38 and the rear tapered roller bearing 40.

According to the configuration of the second embodiment, the oil guide starting point P of the oil guide section 76 is located on the outer edge side of the retainer 56, and the oil guide section 76 has a large length L.
3, the flow of oil can be adjusted such that the amount of oil flowing to the rear tapered roller bearing 40 is increased while the amount of oil flowing to the front tapered roller bearing 38 is decreased.

[0050]

As is clear from the above detailed description, according to the present invention, an oil guide wall portion that is continuous with the oil flow groove and the retainer inner circumferential groove is provided in the inner peripheral portion of the retainer. By providing an oil guide part that can adjust the amount of oil to the first bearing and the amount of oil to the second bearing, the amount of oil to the first bearing and the second bearing can be adjusted as desired. As a result, both bearings can be lubricated in a well-balanced manner.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a transaxle according to a first embodiment of the invention.

FIG. 2 is a cross-sectional view of the transfer section taken along the line ⓓ-ⓓ of FIG. 3;

FIG. 3 is a front view of the transfer section in FIG. 2;

FIG. 4 is an enlarged sectional view of the vicinity of the oil flow groove.

FIG. 5 is a cross-sectional view taken along line V-V in FIG. 6 of a transfer section according to a second embodiment of the invention.

6 is a front view of the transfer section in FIG. 5. FIG.

FIG. 7 is a sectional view of a conventional transfer section.

FIG. 8 is a perspective view of a conventional retainer.

[Explanation of symbols]

2 Transaxle 10 Speed change gear part 22 Transfer intermediate shaft 24 Transfer part 26 Transfer drive bevel gear 28 Transfer bevel pinion gear 30 Transfer pinion shaft 38 Front tapered roller bearing 40 Rear tapered roller bearing 56 Retainer 62 Oil flow groove 72 Projection 74 Oil guide Wall portion 75 Retainer circumferential groove 76 Oil guide portion P Oil guide starting point

Claims (1)

[Claims] 1. First and second bearings rotatably supporting a gear shaft on which one gear of a pair of meshing gears is provided are arranged apart from each other, and the gear shaft is raked up by the rotation of the pair of gears. In the transaxle lubricating device, the first and second bearings are lubricated by flowing the oil into the oil flow groove of the retainer in which the first and second bearings are held, and the oil is applied to the inner circumference of the retainer. An oil guide wall is provided that is continuous with the flow groove and the retainer inner circumferential groove, and the oil guide wall includes an oil guide that makes it possible to adjust the amount of oil to the first bearing and the amount of oil to the second bearing. A transaxle lubrication device characterized by having a series of lubrication devices.