JP2767523B2 - Lubricating device for tandem drive shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tandem drive shaft lubrication device for a vehicle.

[0002]

2. Description of the Related Art In a tandem drive shaft such as a rear two-shaft drive truck, a driving force from an engine is transmitted to two rear shafts, a front front shaft and a rear rear shaft. Therefore, a differential gear device is used. Conventionally, a differential gear device and a transfer have been arranged in a transfer case of a tandem drive shaft, and in order to improve lubrication between the drive gear and the input shaft of the transfer, the surface of the drive gear and the inner peripheral surface are connected. An oil path is formed to connect the two, and the lubricating oil is dropped from above the drive gear. (For the lubricating oil supply device, for example,
See No. 11163. In this prior art, a ring gear (reduction gear) scoops up the lubricating oil in the axle housing, and an oil passage for guiding the scooped up lubricating oil to the upper part of the transfer case is formed.

In a conventional tandem drive shaft lubrication system, there is almost no difference in rotation between the two shafts during straight running, and there is almost no difference in rotation between the drive gear and the input shaft.
At the time of cornering or the like, a rotation difference occurs between the two shafts, that is, between the drive gear and the input shaft. When the drive gear is driven only by the rear front shaft such as when the rear shaft is idling and the rotation difference between the drive gear and the input shaft is large, the amount of lubricating oil supplied is not sufficient, and the drive gear and the input shaft There was a risk of seizure damage between the two.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a lubricating device for a tandem drive shaft, in which a large amount of lubricating oil is supplied between a drive gear and an input shaft, and only the rear front shaft such as when the rear rear shaft idles. It is an object of the present invention to prevent seizure damage between the drive gear and the input shaft even if the rotation difference between the drive gear and the input shaft is large.

[0005]

According to the present invention, a differential gear device and a transfer are provided in a transfer case.
The drive gear of the transfer is rotatably supported on the outer peripheral surface of the input shaft, the front differential gear of the differential gear unit is integrally formed with the drive gear, and the through shaft is connected to the rear differential gear of the differential gear unit. In a lubricating device for a tandem drive shaft arranged so that a shaft crosses inside an axle housing,
An impeller is disposed at the rear end of the cylindrical portion of the rear differential gear,
The technical means is that the vicinity of the impeller and the contact surface between the drive gear and the input shaft are communicated by an oil passage. The oil passage between the vicinity of the impeller and the contact surface between the drive gear and the input shaft includes a first oil passage between the through shaft and the cylindrical portion of the rear inter differential gear, a second oil passage in the input shaft, and a through oil passage. An oil passage formed in the shaft (the right end opens near the impeller.)
And the second oil passage in the input shaft can be used.

[0006]

When the input shaft is driven, the drive gear and the rear differential gear / impeller rotate. The impeller functions as a pump, and supplies lubricating oil to the contact surface between the drive gear and the input shaft through an oil passage near the impeller and the contact surface between the drive gear and the input shaft.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The front transfer case 11 and the rear axle housing 12 are connected to each other, and the front part of the input shaft 1 is supported by a bearing 13 above the front end of the transfer case 11. The spider 15 of the differential gear device 3 is connected near the rear end of the input shaft 1, and the drive gear 2 of the transfer is supported on the outer peripheral surface of the input shaft 1 in front of the differential gear device 3. An inter differential pinion 16 is pivotally supported on the spider 15 of the differential gear device 3. The inter differential pinion 16 is a front inter differential gear 17 and a rear inter differential gear 18 integrally formed on the rear surface of the drive gear 2.
Mesh with. As described above, the differential gear device 3 includes the spider 1
5, Inter differential pinion 16, Front inter differential gear 17
And a rear inter differential gear 18 and the like. A partition wall 20 is formed in front of the axle housing 12, and a cylindrical portion 19 of a rear inter differential gear 18 is supported by a bearing 21 above the partition wall 20, and a rear end of the input shaft 1 is connected to the cylindrical portion 19. It is rotatably supported on the inner peripheral surface. By the bearing 22 at the lower part of the partition wall 20 and the pilot bearing 25 behind it,
The driven shaft 23 is rotatably supported, and the driven gear 24 connected to the front end of the driven shaft 23 meshes with the drive gear 2. The ring gear 4 is rotatably disposed on the axle housing 12, a hypoid pinion 26 connected to the rear end of the driven shaft 23 meshes with the ring gear 4, and the ring gear 4 is connected to the rear front shaft via a mechanism (not shown). You.
A lubricating oil 28 is stored in a lower portion of the transfer case 11 and the axle housing 12, for example. The shifter sleeve 27 is engaged with a gear formed integrally with the outer periphery of the input shaft 1 at the front side of the drive gear 2, and the shifter sleeve 27 is moved toward the drive gear 2, whereby the input shaft 1 and the drive gear 2 are moved. And can be directly connected.

The front end of a through shaft 31 is connected to the inner peripheral surface of the cylindrical portion 19 of the rear differential gear 18 via a spline (not shown) so as to be able to transmit the through shaft 31 so that the through shaft 31 crosses the inside of the axle housing 12. And a rear end of the through shaft 31 is supported by a bearing 32 at an upper rear end of the axle housing 12. An oil reservoir 33 for storing a lubricating oil 28 is formed below the cylindrical portion 19 of the rear differential gear 18, and the lubricating oil scraped up by the ring gear 4 is formed.
28 flows into the oil reservoir 33 from above the opening at the right end of the oil reservoir 33. In the cylindrical portion 19 of the rear differential gear 18, a gap 34 is provided between the rear end of the input shaft 1 and the front end of the through shaft 31. The first oil passage 5 communicating between the gap 34 and the rear end of the cylindrical portion 19 is formed by the through shaft 31 and the cylindrical portion 19.
The first oil passage 5 is formed at a location where
As shown in (a), it may be formed on the inner peripheral surface of the cylindrical portion 19 of the rear differential gear 18, or may be formed on the outer peripheral surface of the through shaft 31 as shown in FIG. 2 (b). . A plurality of openings may be provided on the surface of the through shaft 31 in the vicinity of the impeller 8, which will be described later, and an oil passage connecting the opening and the gap 34 may be formed in the through shaft 31. At the rear end of the cylindrical portion 19 of the rear differential gear 18, a plurality of impellers 8 are disposed via support brackets 36, and by rotating the cylindrical portion 19 and the impeller 8, the lubricating oil 28 in the oil reservoir 33 is removed. Pumping is performed toward the gap 34. An annular recess 35 is formed on the inner peripheral surface of the drive gear 2, and the annular recess 35 and the gap are formed in the input shaft 1.
A second oil passage 6 (a vertical oil passage in the front-rear direction provided at the center of the input shaft 1 and a horizontal oil passage connecting the front end of the vertical oil passage and the annular recess 35) communicating with the oil passage 34 are formed. Second oil passage 6
The lubricating oil supplied to the annular recess 35 through the lubricant lubricates between the inner peripheral surface of the drive gear 2 and the outer peripheral surface of the input shaft 1. A third oil passage 7 that connects the annular recess 35 to the surface of the drive gear 2 is formed, and a part of the lubricating oil 28 supplied to the annular recess 35 passes through the third oil passage 7 by centrifugal force. It flows out to the surface of the drive gear 2 and lubricates the shifter sleeve 27, the space between the drive gear 2 and the driven gear 24, and the like. In addition,
By omitting the third oil passage 7, lubrication between the shifter sleeve 27, the drive gear 2 and the driven gear 24, and the like can be performed by a conventional technique. In this case, the position of the second oil passage 6 in the vertical direction (the left-right direction in FIG. 1) of the horizontal oil passage can be appropriately selected.

The operation of the embodiment of the present invention will be described.
The driving force from the engine is transmitted by a transmission (not shown), a front propeller shaft, and a flange coupling.
The input shaft 1 is transmitted through the input shaft 10 to rotate the input shaft 1. The rotation of the input shaft 1 is controlled by the spider 15 of the differential gear device 3 and the inter differential pinion.
The power is transmitted to the front and rear inter differential gears 17 and 18 via the transmission 16. The rotation of the front differential gear 17 is transmitted to the rear front axle via the drive gear 2, the driven gear 24, the driven shaft 23, the hypoid pinion 26, the ring gear 4, and a transmission mechanism (not shown). The rotation of the rear differential gear 18 is transmitted to the rear rear axle via the cylindrical portion 19, the through shaft 31, and a tandem propeller shaft (not shown). When a difference in rotation occurs between the rear front axle and the rear rear axle during cornering, etc., the inter differential pinion
16 rotates to absorb this difference in rotation.

[0010] The rotation of the input shaft 1 rotates the ring gear 4, and the lubricating oil scooped up by the ring gear 4 flows into the oil reservoir 33 from the right end opening of the oil reservoir 33. The lubricating oil flowing into the oil reservoir 33 is pressure-fed by the impeller 8 and
The oil flows into the gap 34 through the oil passage 5 and other oil passages, and
The oil flows into the annular recess 35 of the drive gear 2 through the oil passage.
The lubricating oil that has flowed into the gap 34 lubricates between the outer peripheral surface of the rear end portion of the input shaft 1 and the inner surface of the rear differential gear 18 (including the cylindrical portion 19). (If necessary, an oil passage is formed between the outer peripheral surface of the rear end portion of the input shaft 1 and the inner surface of the rear inter differential gear 18, so that sufficient lubrication of this portion can be achieved.) Also, annular recess
The lubricating oil supplied to 35 lubricates between the inner peripheral surface of the drive gear 2 and the outer peripheral surface of the input shaft 1. Then, part of the lubricating oil 28 supplied to the annular recess 35 flows out to the surface of the drive gear 2 through the third oil passage 7 due to centrifugal force, and the shifter sleeve 27, the space between the drive gear 2 and the driven gear 24, etc. Lubricate.

[0011]

According to the present invention, there is provided a lubricating device for a tandem drive shaft, wherein an impeller is provided at a rear end of a cylindrical portion of a rear differential gear, and a portion between the vicinity of the impeller and a contact surface between the drive gear and the input shaft is provided. Are connected by an oil passage. When the input shaft is driven, the impeller functions as a pump, and a large amount of lubricating oil flows to the contact surface between the drive gear and the input shaft through the oil passage near the impeller and the contact surface between the drive gear and the input shaft. Supply. Therefore, even when driven only by the rear front shaft and the rotation difference between the drive gear and the input shaft is large,
No seizure damage occurs between the drive gear and the input shaft.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a connection portion between a rear differential gear and a through shaft in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input shaft 2 Drive gear 3 Differential gearing 8 Impeller 11 Transfer case 12 Axle housing 17 Front differential gear 18 Rear differential gear 31 Through shaft

──────────────────────────────────────────────────続 き Continuation of front page (56) References Japanese Utility Model 3-11163 (JP, U) Japanese Utility Model 5-71524 (JP, U) Japanese Utility Model 6-16761 (JP, U) Japanese Utility Model Sho 63- 164641 (JP, U) Japanese Utility Model 4-36155 (JP, U) Japanese Utility Model 3-85751 (JP, U) Japanese Utility Model 2-117465 (JP, U) Japanese Utility Model 2-109058 (JP, U) Japanese Utility Model No. 81223 (JP, U) Japanese Utility Model No. 63-150161 (JP, U) Japanese Utility Model No. 63-14424 (JP, U) Japanese Utility Model No. 61-64562 (JP, U) Japanese Utility Model No. 59-199061 (JP, U) Jikgyo Hei 4-35632 (JP, Y2) Jikgyo Hei 4-35631 (JP, Y2) Jikgyo 64-7061 (JP, Y2) Jikgyo 61-19233 (JP, Y2) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 57/04 F16H 48/08 B60K 17/36

Claims (1)

(57) [Claims] A differential gear device and a transfer are disposed in a transfer case, a drive gear of the transfer is rotatably supported on an outer peripheral surface of an input shaft, and a front differential gear of the differential gear device is connected to the drive gear. In a tandem drive shaft integrally formed and connected with a through shaft to a rear differential gear of a differential gear device and arranged so that the through shaft crosses inside the axle housing, a blade is provided at a rear end of a cylindrical portion of the rear differential gear. A tandem drive shaft lubrication device, wherein a vehicle is disposed, and a portion near the impeller and a contact surface between the drive gear and the input shaft are communicated by an oil passage.