JPH06341515A - Lubrication device for center differential gear - Google Patents

Abstract

PURPOSE:To eliminate the need for an oil pump, and thereby make a structure simple by letting lubricant be so constituted as to be fed to a center differential gear means provided for the main shaft of a transfer means by making use of the axial movement of a sliding yoke with respect to an output shaft. CONSTITUTION:A center differential gear means 32 is provided for a main shaft 20 inputting drive force in the transfer member 2, and a sliding yoke 82 is externally fitted in a rear side output shaft 56 disposed to the main shaft 20 in series out of the front and rear output shafts 54 and 56, to which the aforesaid drive force is distributed, in such a way that the yoke can freely be moved only in the axial direction. The axial movement of the sliding yoke 82 via a propeller shaft while being linked with the vertical movement of wheels due to a road surface condition when a vehicle is running, permits the yoke 82 to be moved to the direction A, so as to allow lubricant to be thereby sucked up into an expand and contract chamber 98 located between the rear side output shaft 56 and a slide pipe section 54 through a suction passage 112, and also allow lubricant within the expand and contract chamber 98 to be fed to the enter differential gear means 32 through a discharge passage 14-1, a check valve 118 and the like when the yoke is moved to the direction B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a center differential device, and in particular, an existing mechanism can be used to forcibly supply lubricating oil into the center differential device without requiring an oil pump. The present invention relates to a lubricating device for a center differential device that can surely lubricate the inside of the center differential device without increasing the size due to the installation of an oil pump.

[0002]

2. Description of the Related Art A four-wheel drive vehicle is provided with a transmission for converting a driving force of an internal combustion engine and taking it out, and a transfer device for distributing the driving force input from the transmission to two output shafts for output. It is provided. Some four-wheel drive vehicles are equipped with a center differential device that allows the differential between two output shafts of this transfer device.

An example of such a transfer device for a four-wheel drive vehicle is disclosed in Japanese Patent Application Laid-Open No. 63-270236. The transfer device for a four-wheel drive vehicle disclosed in this publication is equipped with a transmission having a center differential device, and a viscous coupling is incorporated in this center differential device to automate the differential lock operation of the center differential device. Is.

[0004]

By the way, the center differential device provided in the four-wheel drive vehicle is arranged in the transmission case, the transfer case, or the like.
In the past, in order to lubricate the inside of the center differential device, the rotating gear splashes the lubricating oil, the guide groove (gutter) drops the lubricating oil, the oil bath is immersed in the lubricating oil, and the oil pump forces it. Supply of lubricating oil was performed.

However, the lubrication by splashing the lubricating oil or dropping the lubricating oil has a disadvantage that it is difficult to supply the lubricating oil into the center differential device. Further, when the center differential device is arranged at a position higher than the lubricating oil surface, there is a disadvantage that the oil bath becomes difficult.

Further, in the oil pump forcibly supplying the lubricating oil into the center differential device, since it is difficult to secure the installation space in the existing mechanism,
There is an inconvenience that cannot be installed. Therefore, when installing the oil pump, there is a disadvantage that the size must be increased in order to secure the installation space.

For this reason, the lubricating device of the center differential device can be forcibly supplied with lubricating oil into the constantly rotating center differential device without causing an increase in size due to the installation of the oil pump, and reliable lubrication. Is expected to emerge.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a center differential device on the main shaft of a transfer device to which a driving force from a transmission is input, and the center differential device is provided. One output shaft of the two output shafts, to which the driving force is distributed while the differential is allowed by, is arranged in parallel with the main shaft, and the other output shaft of the two output shafts is arranged. It is arranged in series with the main shaft, and a sliding yoke of another propulsion shaft is externally fitted to the other output shaft arranged in series with the main shaft so as to be axially movable and non-rotatable. Lubricating oil feeding means for feeding lubricating oil into the center differential device by axial movement of the sliding yoke with respect to the other output shaft is provided.

[0009]

According to the structure of the present invention, the other output shaft of the two output shafts, to which the driving force is distributed while the differential is allowed by the center differential device provided on the main shaft of the transfer device, is used. Lubricating oil is fed into the center differential device by axial movement of a sliding yoke, which is arranged in series with the other shaft and is axially movable with respect to the other output shaft and is relatively non-rotatably fitted to the other output shaft. By providing the lubricating oil feeding means, the existing mechanism can be used to forcefully feed the lubricating oil into the center differential device without the need for an oil pump.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 1, 2 is a transfer device. The transfer device 2 is connected to a transmission (not shown) of an internal combustion engine vertically mounted on the front side of a four-wheel drive vehicle (not shown). In the transfer device 2, an input shaft 6 is supported by a transfer case 4 by an input bearing 8. The input shaft 6 has a front side that is one end side connected to an output shaft (not shown) of a transmission (not shown), and an input gear 10 is provided on the rear side that is the other end side.

The transfer case 4 has an input shaft 6
A counter shaft 12 is fixed in parallel with the above. Counter axis 1
A counter first gear 14 and a counter second gear 16 which are integrally provided on the shaft 2 are axially supported by a counter gear bearing 18. The counter first gear 14 is meshed with the input gear 10.

The transfer case 4 has an input shaft 6
The main shaft 20 is pivotally supported in series. Main shaft 20
Has a front side, which is one end side, axially supported by the main first bearing 22 on the input shaft 6, and an intermediate portion by the main second bearing 24 on the transfer case 4. A main gear 26 is supported by a main gear bearing 28 on the main shaft 20. The main gear 26 is meshed with the counter second gear 16.

Between the input shaft 6 and the main shaft 20,
A deceleration switching mechanism 30 is provided. The deceleration switching mechanism 30
By connecting the main shaft 20 to the input shaft 6, the driving force is directly transmitted to the main shaft 20, and by connecting the main gear 26 to the main shaft 20, the driving force is transmitted to the counter first and second gears 14 and 16. A switching operation is performed so as to cut off the transmission of the driving force to the main shaft 20 by decelerating via the transmission to the main shaft 20, or by releasing the connection between the input shaft 6, the main shaft 20, and the main gear 26.

On the rear side, which is the other end side of the main shaft 20,
A center differential device 32 is provided. The center differential device 32 is provided at a position higher than the oil level shown by the alternate long and short dash line in FIG. As shown in FIG. 5, the center differential device 32 includes a diff case 34, a diff small gear shaft 36, two diff small gears 38 and 40, and two diff front / rear large gears 42.
And 44.

The differential case 34 is arranged so as to cover the rear side of the main shaft 20, and is axially supported by the differential case bearing 46 on the transfer case 4. The differential small gear shaft 36 has a central portion fixed to the main shaft 20, and
Both end portions are fixed to the differential case 34, respectively. 2 above
The two diff small gears 38 and 40 are pivotally supported by the diff small gear shaft 36, respectively. The two differential front and rear large gears 42
44 is engaged with the small differential gears 38 and 40, respectively, and the front and rear gear bearings 48 of the differential are attached to the main shaft 20, respectively.
-It is pivotally supported by 49.

A drive sprocket 50 is integrally provided on the differential front large gear 42 of the center differential device 32. Therefore, the drive sprocket 50 is rotatably supported by the main shaft 20 by the differential front gear bearing 48 and rotates together with the differential front large gear 42. The drive sprocket 50 is coupled to and disengaged from the main shaft 20 by the front side switching mechanism 52 to cut off the transmission of the driving force.

The transfer device 2 is provided with two output shafts 54 and 56 to which a driving force is distributed while the differential is allowed by the center differential device 32. Among these two output shafts 54 and 56, the front output shaft 54 that is one of the output shafts is arranged in parallel with the main shaft 20, and the other output shaft that is the rear output shaft 56.
Are arranged in series with the main shaft 20.

The front output shaft 54 arranged in parallel with the main shaft 20 is connected to the transfer case 4 with the front output first.
It is axially supported by the second bearings 58 and 60. Front output shaft 5
4, a driven sprocket 62 is integrally provided. A drive chain 64 is wound around the driven sprocket 62 and the drive sprocket 50, and the driving force from the main shaft 20 side is transmitted to the front output shaft 54.

A front outer peripheral spline 66 is formed on the front output shaft 54. A front inner peripheral spline 72 is formed in a front slide pipe portion 70 on a front sliding yoke 68 of a front propulsion shaft (not shown) that is one propulsion shaft connected to the front output shaft 54. The front sliding yoke 68 connects the front inner peripheral spline 72 of the front slide pipe portion 70 to the front outer peripheral spline 6 of the front output shaft 54.
6 is fitted to the front output shaft 54 so as to be movable in the axial direction and non-rotatable relative to the front output shaft 54.

Reference numeral 74 is a front cap that seals the inside of the front slide pipe portion 70, reference numeral 76 is a front seal member that seals between the front slide pipe portion 70 and the transfer case 4, and reference numeral 78 is the front slide pipe portion 70. The front slide bearing is interposed between the transfer case 4 and the transfer case 4.

The rear output shaft 56 arranged in series with the main shaft 20 is integrally provided by connecting the front side, which is one end side, to the differential rear large gear 44 of the center differential device 32. Therefore, the differential rear large gear 44 is
The main shaft 20 is axially supported by the differential rear gear bearing 49,
It rotates together with the large rear differential gear 44.

A rear outer peripheral spline 80 is formed on the rear output shaft 56. A rear inner sliding spline 86 is formed in the rear slide tube portion 84 of the rear sliding yoke 82 of the rear propulsion shaft (not shown) which is another propulsive shaft connected to the rear output shaft 56. There is. The rear sliding yoke 82 connects the rear inner peripheral spline 86 of the rear slide pipe portion 84 to the rear outer peripheral spline 8 of the rear output shaft 56.
By spline fitting to 0, it is fitted onto the rear output shaft 56 so as to be axially movable and non-rotatable.

Reference numeral 88 is a rear cap that seals the inside of the rear slide tube portion 84, reference numeral 90 is a rear sealing member that seals between the rear slide tube portion 84 and the transfer case 4, and reference numeral 92 is a rear portion. The rear slide bearing is interposed between the side slide tube portion 84 and the transfer case 4.

As described above, in the transfer device 2, the center differential device 32 is provided on the main shaft 20 to which the drive force from the transmission (not shown) is input, and the center differential device 32 allows the drive force while allowing the differential. Two front / rear output shafts 54/56 to be distributed
One of the front output shaft 54 is arranged in parallel with the main shaft 20, and the other rear output shaft 56 of the two front and rear output shafts 54, 56 is arranged in series with the main shaft 20. Other rear output shaft 5 installed in series with the main shaft 20.
A rear sliding yoke 82 is externally fitted to the shaft 6 so as to be movable in the axial direction and not relatively rotatable.

To the center differential device 32 provided on the main shaft 20 of the transfer device 2, the lubricating oil is fed into the center differential device 32 by axial movement of the rear sliding yoke 82 with respect to the rear output shaft 56. Lubricating oil feeding means 94 is provided.

The lubricating oil supply means 94 is provided by partitioning a lubricating oil chamber 96 around the rear output shaft 56 in the transfer case 4 of the transfer device 2, and at the same time, the rear sliding pipe of the rear sliding yoke 82 is provided. An expansion / contraction chamber 98 which is expanded / contracted by the axial movement of the sliding yoke 82 is defined in the portion 84.

The lubricating oil chamber 96 is provided in the transfer case 4 between the differential case bearing 46 of the differential case 34 and the rear slide bearing 92 of the rear slide pipe portion 84. The expansion / contraction chamber 98 includes the rear side of the rear output shaft 56 and the rear cap 88 in the rear slide tube portion 84.
And a sliding yoke 82,
The rear cap 88 is moved by the axial movement of the rear output shaft 56.
It is moved closer to and away from the rear side and expanded and contracted.

The lubricating oil chamber 96 is scraped up by the meshing rotation of the input gear 10, which is the transfer gear of the transfer device 2, the counter first and second gears 14 and 16 and the main gear 26, and the drive chain 64. The lubricating oil is guided by the guide passage 100 and stored.

The guide passage 100 is provided in the transfer case 4
The lubricating oil receiving member 102 mounted above the gears 10, 14, 16 and 26, and the lubricating oil receiving member 10
The mounting holes 104 and 106 formed in the transfer case 4 to mount the transfer case 4, the wall portion 108 of the transfer case 4 extending from the rear end of the lubricating oil receiving member 102 to the upper part of the lubricating oil chamber 96, and the upper part of the lubricating oil chamber 96. Transfer case 4
And a guide hole 110 formed in the wall portion 108 of the.

The lubricating oil scraped up by the gears 10, 14, 16, 26 and the drive chain 64 is received by the lubricating oil receiving member 102, flows from the mounting holes 104, 106 to the wall portion 108 of the transfer case 4, and is guided. Hole 11
From 0 to the lubricating oil chamber 96.

The lubricating oil in the lubricating oil chamber 96 is supplied to the suction passage 1
12 is sucked into the expansion / contraction chamber 98. Suction passage 112
For example, as shown in FIG. 2, one rear outer peripheral spline tooth 80A of the rear outer peripheral spline 80 of the rear output shaft 56 fitted to the rear inner peripheral spline 86 of the rear slide tube portion 84 is formed. With the missing tooth, the lubricating oil chamber 9
6 is provided between the rear output shaft 56 and the rear slide pipe portion 54 so as to connect the expansion chamber 6 and the expansion chamber 98.

The lubricating oil in the expansion chamber 98 is supplied to the discharge passage 11
4 is discharged into the differential case 34 of the differential device 32. The discharge passage 114 includes an output shaft discharge passage 114-1 provided in the rear output shaft 56 and a main shaft discharge passage 114-2 provided in the main shaft 20.

The output shaft discharge passage 114-1 is opened on the rear end side of the rear output shaft 56 so as to face the expansion / contraction chamber 98 and on the front end side thereof, and on the front side of the rear output shaft 56 and the rear side of the main shaft 20. The terminal side is opened so as to face it. The main shaft discharge passage 114-2 is open to the rear end of the main shaft 20 so as to face the terminal end of the output shaft discharge passage 114-1 and to open the start end side, and the gear storage space inside the differential case 34 on the outer periphery of the main shaft 20. An opening is provided so as to face the terminal end of the central portion of 116.

A check valve 118 which allows the lubricating oil to flow into the differential case 34 is provided in the middle of the discharge passage 114. The check valve 118 is provided on the terminal side of the front output shaft discharge passage 114-1 of the rear output shaft 56.

As shown in FIGS. 3 and 4, the check valve 118 is provided with a valve chamber 120 on the terminal side of the output shaft discharge passage 114-1, and a valve plate 122 partitioning the valve chamber 120 is provided with a stop ring 1.
23, the valve plate 122 is provided with a valve hole 124, and the valve hole 1 is provided on the main shaft discharge passage 114-2 side of the valve plate 122.
24 is provided with a flat plate-shaped valve body 126 for opening and closing the valve body 126.
Of the retainer 13 to the valve shaft 128 extended to the valve chamber 120 side of the
0 is attached, a spring 132 for urging the valve body 126 in the direction of closing the valve hole 124 is provided between the valve plate 122 and the retainer 130, and a flat check valve structure is provided. .

Next, the operation will be described.

The transfer device 2 is connected to a transmission (not shown) of an internal combustion engine which is vertically installed on the front side of a four-wheel drive vehicle (not shown), and a driving force is input from the transmission to the input shaft 6
Entered in. The driving force of the input shaft 6 is the deceleration switching mechanism 30.
Is transmitted directly to the main shaft 20, is decelerated and transmitted via the input gear 10, the counter first and second gears 14 and 16, and the main gear 26, or is cut off.

When the drive sprocket 50 is connected to the main shaft 20 by the front side switching mechanism 52, the driving force input to the main shaft 20 is a front side arranged in parallel with the main shaft 20 by the center differential device 32. It is distributed and transmitted to the output shaft 54, drives front wheels (not shown) through the front propulsion shaft, and is distributed and output to the rear output shaft 56 arranged in series with the main shaft 20, A rear wheel (not shown) is driven via the rear propulsion shaft. At this time, the center differential device 32
Distributes the driving force to the front / rear output shafts 54/56 while permitting the differential between the front / rear output shafts 54/56 and outputs them.

On the other hand, the drive force input to the main shaft 20 is not transmitted to the front output shaft 54 when the drive sprocket 50 is disengaged from the main shaft 20 by the front switching mechanism 52, and the rear output is not output. It is output only to the shaft 56 and drives the rear wheels via the rear propulsion shaft.

In a four-wheel drive vehicle (not shown), the front and rear wheels are moved up and down depending on the road surface condition during traveling, and the front and rear propulsion shafts (not shown) are axially displaced accordingly. The axial displacements of the front and rear propulsion shafts are the same as those of the front output shaft 54.
These are absorbed by the axial movement of the front sliding yoke 68 that is spline-fitted in the axial direction and the axial movement of the rear sliding yoke 82 that is spline-fitted in the rear output shaft 56.

Lubricating oil feeding means 94 for feeding lubricating oil into the center differential device 32 provided on the main shaft 20 of the transfer device 2 moves axially with respect to the rear output shaft 56 of the rear sliding yoke 82. To supply the lubricating oil.

The lubricating oil feeding means 94 receives the lubricating oil scraped up by the meshing rotation of the gears 10, 14, 16 and 26 of the transfer device 2 and the driving of the drive chain 64, and the lubricating oil receiving member 102 and the mounting hole. The guide passage 100 is formed by the guide passages 104 and 106, the wall portion 108 of the transfer case 4, and the guide hole 110.

The lubricating oil introduced into the lubricating oil chamber 96 is made into a missing tooth of one rear outer peripheral spline tooth 80A of the rear outer peripheral spline 80 of the rear output shaft 56 so that the rear output shaft 5
6 is sucked into the expansion / contraction chamber 98 by the suction passage 112 provided between the rear slide pipe portion 54.

That is, when the front and rear wheels are moved up and down due to the road surface condition while the four-wheel drive vehicle is running and the front and rear propulsion shafts (not shown) are axially displaced, the front The axial displacement of the rear propulsion shaft is attempted to be absorbed by the axial movement of the front and rear sliding yokes 68 and 82.

As a result, the expansion / contraction chamber 98 defined between the rear side of the rear output shaft 56 and the rear cap 88 in the rear slide tube portion 84 of the lubricating oil feeding means 94 is slidable. It is expanded or contracted by the movement of the yoke 82 in the axial direction.

The lubricating oil in the lubricating oil chamber 96 expands in the expansion / contraction chamber 98 due to the axial movement of the sliding yoke 82 in the direction of the arrow A and becomes a negative pressure state.
Suction passage 1 provided between the rear slide pipe portion 54 and the rear slide pipe portion 54.
12 is sucked into the expansion / contraction chamber 98.

The lubricating oil in the expansion / contraction chamber 98 flows from the output shaft discharge passage 114-1 to the non-return valve when the expansion / contraction chamber 98 is compressed to a pressurized state due to the axial movement of the sliding yoke 82 in the direction of arrow B. Gear storage space 1 in the differential case 34 via the main shaft discharge passage 114-2 via 118.
It is discharged to 16 central parts.

The lubricating oil discharged to the central portion of the differential case 34 is spread and sent to the entire differential case 34 by a centrifugal force, and is sent to the differential case 34, the pinion shaft 36, and the differential small gear 3 which constitute the center differential device 32.
8 ・ 40 and the large rear gears 42 ・ 44 on the rear side of the differential are lubricated.

The check valve 118 provided on the terminal side of the output shaft discharge passage 114-1 is illustrated when the sliding chamber 82 is axially moved in the direction of arrow A to expand the expansion / contraction chamber 98 to a negative pressure state. As shown in FIG. 3, the valve body 126 is pressed against the valve plate 122 by the spring 132 to close the valve hole 124 and prevent the backflow of the lubricating oil to the expansion / contraction chamber 98 side. Further, the check valve 118 is provided with the rear sliding yoke 82.
When the expansion / contraction chamber 98 is contracted and put into a pressurized state by the axial movement of the valve in the direction of arrow B, the valve body 126 is separated from the valve plate 122 against the spring 132 and the valve hole 124 is opened, as shown in FIG.
To allow the lubricating oil to flow to the side of the differential case 34.

The suction passage 112 provided between the rear output shaft 56 and the rear slide pipe portion 84 has the check valve 1
The sectional area is smaller than the passage sectional area of the 18 valve holes 124. Therefore, although the lubricating oil in the expansion chamber 98 slightly flows backward through the suction passage 112 when the expansion chamber 98 is contracted, most of the lubricating oil is fed into the differential case 34 by the discharge passage 114 via the check valve 118. . In this case, for example, the guide hole 11 of the wall portion 108 of the transfer case 4 is
If a non-return valve that allows circulation to the lubricating oil chamber 96 side is provided on the lubricating oil chamber 96 side of 0 as shown by the broken line in FIG. 1, the pump function can be more reliably achieved and the lubricating oil can be sent. Can be paid.

As described above, the center differential device 32 provided on the main shaft 20 of the transfer device 2 is used.
The lubrication device of 2 has two front side parts to which the driving force is distributed while the differential is allowed by the center differential device 32.
The rear output shaft 56 of the rear output shafts 54 and 56 is arranged in series with the main shaft 20, and the rear output yoke is fitted onto the rear output shaft 56 so as to be axially movable and non-rotatable. Lubricating oil feeding means 94 for feeding lubricating oil into the center differential device 32 by axial movement of 82 with respect to the rear output shaft 56 is provided.

As a result, it is not necessary to separately provide an oil pump in the transfer device 2 by utilizing the existing mechanism such as the rear output shaft 56 and the rear sliding yoke 82.
Lubricating oil can be forcibly fed into the center differential device 32. Therefore, the inside of the center differential device 32 can be reliably lubricated without causing an increase in size due to the installation of the oil pump, and the structure is simple and compact, and can be installed in the transfer device 2. Therefore, the functions of the transfer device 2 and the center differential device 32 can be ensured while the functions of lubrication can be sufficiently fulfilled.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible. For example, the discharge passage 114 may include the differential small gear 38.
It is also possible to form a sliding contact portion between the differential gear 40 and the differential small gear shaft 36 so that the end side is opened. That is, as shown in FIG. 6, the main shaft discharge passage 114 provided in the main shaft 20.
-2 is provided on the outer periphery of the central portion of the main shaft 20 by opening the terminal end side, and the differential small gear shaft 36 having the central portion fixed to the main shaft 20 is started at the terminal end side of the main shaft discharge passage 114-2. It is also possible to provide a differential small gear shaft discharge passage 114-3 which is open at the end side and which is open at the end side at the sliding contact portion of the differential small gear shaft 36 where the small differential gears 38 and 40 are in sliding contact. Reference numeral 134 is a blind plug.

According to this structure, the lubricating oil can be directly supplied to the sliding contact portion between the small diff gears 38, 40 and the small diff gear shaft 36 in the diff case 34 where it is difficult to supply the lubricating oil. It can achieve various lubrication.

The check valve 118 of the flat plate type is provided in the valve chamber 1
20, valve plate 122, retaining ring 123, valve hole 124, valve hole 1
24, the valve body 126, the valve shaft 128, the retainer 130, and the spring 132. For example, as shown in FIG. 7, the valve chamber 136, the valve seat 138, the spherical valve body 140, the spring 142, the retainer 144, A ball type check valve 148 including a retaining ring 146 may be used. According to the ball type check valve 148, the plate type check valve 118 is provided.
The number of parts can be reduced and the structure can be simplified, and the cost can be advantageously increased.

[0056]

As described above, according to the present invention, the sliding yoke externally fitted to the other output shaft arranged in series with the main shaft of the transfer device so as to be axially movable and non-rotatable. By utilizing the axial movement with respect to the output shaft of the above, the existing mechanism is utilized by providing the lubricating oil feeding means for feeding the lubricating oil into the center differential device provided on the main shaft of the transfer device. The lubricating oil can be forcibly fed into the center differential device without the need for an oil pump. Therefore, the inside of the center differential device can be reliably lubricated without causing an increase in size due to the installation of the oil pump.

[Brief description of drawings]

FIG. 1 is a sectional view of a lubricating device of a center differential device showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line 〓-〓 in FIG.

FIG. 3 is a cross-sectional view of the check valve in a closing operation state.

FIG. 4 is a cross-sectional view of the check valve in an opening operation state.

FIG. 5 is an enlarged cross-sectional view of a main part of the center differential device.

FIG. 6 is an enlarged sectional view of a main part of a center differential device showing another embodiment of a discharge passage.

FIG. 7 is a sectional view of a center differential device showing another embodiment of the check valve.

[Explanation of symbols]

 2 transfer device 4 transfer case 6 input shaft 12 counter shaft 20 main shaft 32 center differential device 34 differential case 36 differential small gear shaft 38/40 differential small gear 42/44 differential rear / front large gear 50 drive sprocket 54 front output shaft 56 Rear output shaft 62 Driven sprocket 64 Drive chain 68 Front sliding yoke 70 Front slide pipe portion 80 Rear outer peripheral spline 82 Rear sliding yoke 84 Rear slide pipe portion 86 Rear inner peripheral spline 88 Rear cap 94 Lubricating oil supply Means 96 Lubricating oil chamber 98 Expansion / contraction chamber 100 Induction passage 112 Suction passage 114 Discharge passage 116 Gear storage space 118 Check valve

Claims (4)

[Claims] 1. A center differential device is provided on a main shaft of a transfer device to which a driving force from a transmission is input, and the center differential device has two output shafts to which a driving force is distributed while a differential is allowed. One of the output shafts is arranged in parallel with the main shaft, the other output shaft of the two output shafts is arranged in series with the main shaft, and is arranged in series with the main shaft. The sliding yoke of the other propulsion shaft is externally fitted to the other output shaft so as to be movable in the axial direction and non-rotatable relative to the other output shaft, and the lubricating oil is transferred to the center by axial movement of the sliding yoke with respect to the other output shaft. A lubricating device for a center differential device, which is provided with a lubricating oil feeding means for feeding the lubricating oil into the differential device. 2. The lubricating oil feeding means is provided by partitioning a lubricating oil chamber around the other output shaft in the transfer case of the transfer device, and the shaft of the sliding yoke in the sliding pipe portion of the sliding yoke. The expansion / contraction chamber that is expanded / contracted by the directional movement is defined and provided with an induction passage for receiving the lubricating oil scraped up by the transfer gear of the transfer device and guiding the lubricating oil to the lubricating oil chamber. Is provided between the other output shaft and the slide tube portion for sucking into the expansion chamber, and the discharge passage for discharging the lubricating oil of the expansion chamber into the differential case of the differential device is provided with the other output shaft. Lubricating oil feeding means provided on the main shaft and provided with a check valve in the middle of the discharge passage for allowing the lubricating oil to flow into the differential case. The lubricating device for a center differential device according to claim 1. 3. The discharge passage is a discharge passage having a terminal side opening into a gear storage space in the differential case.
Lubricator for the center differential device described in 1. 4. The lubricating device for a center differential device according to claim 2, wherein the discharge passage is a discharge passage having a terminal end opening at a sliding contact portion between a differential small gear and a differential small gear shaft in the differential case.