JPH0536112Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a lubrication structure for a vehicle transfer.

(Prior art and its problems) In conventional vehicle transfers, in order to lubricate the gears, the lubricating oil collected by the oil guide member disposed above the gear train is directly transferred to the oil guide member. Since the lubricant was supplied to each gear from the outside, it had the disadvantage that the gears could not be sufficiently lubricated.

(Purpose of the invention) This invention was made in order to solve the above-mentioned problem, and its purpose is to provide a lubrication structure for a vehicle transfer that can sufficiently lubricate gears with a simple configuration.

(Means for Achieving the Object) In order to achieve the above object, a lubrication structure for a vehicle transfer according to the present invention is a structure for circulating lubricating oil within a vehicle transfer, which includes: A hollow part into which circulating oil flows is formed in the axial center of the shaft, and an oil inflow passage and an oil outflow passage communicating with the shaft surface are provided in this hollow part, and the circumference of the shaft is formed at the position of the oil inflow passage. a cylindrical bearing support retainer provided to surround the transfer gear; a cylindrical bearing support retainer provided above the gear train of the transfer;
an oil recovery guide member for recovering scattered lubricating oil; the inner circumferential surface of the retainer, a bearing member supported by the retainer, and a surface of a shaft supported by the bearing member; , forming an almost liquid-tight oil reservoir space, and providing a guide hole in the upper part of the retainer;
an oil circulation path in which the lubricating oil collected by the oil recovery guide member is dropped into the guide hole and injected into the oil reservoir space, and the lubricating oil is supplied to the hollow portion via the oil inflow path; It is characterized by the formation of

(Function) The lubricating oil collected by the oil collection guide member is dripped into the guide hole at the top of the retainer.
The oil is injected into an oil reservoir space formed using the inner peripheral surface of the retainer and the bearing member. The lubricating oil accumulated in this oil reservoir space flows into the middle part of the shaft center portion through the oil inflow path of the transfer shaft.
The lubricating oil that has flowed into the hollow portion is scattered out of the shaft from the oil outflow path due to centrifugal force as the shaft rotates, and supplies the lubricating oil to the gears of the transfer shaft.

Further, since the oil reservoir space is formed to be substantially liquid-tight, the lubricating oil that has flowed into the space can efficiently flow into the intermediate portion of the shaft from the oil inflow path.

(Embodiment) The figure shows a sectional view of the main part of a transfer to which a lubrication structure is applied, which is an embodiment of this invention.

This transfer is applied to four-wheel drive vehicles in which the engine is mounted vertically at the front, and the power transmitted from the engine to the transmission and transfer is transmitted to the front wheels by making a U-turn. That is,
An input shaft 16 to which the rotational output of the output shaft 15 of the transmission is inputted via a high/low adjusting mechanism (not shown).
is spline-fitted to a cylindrical connecting portion 18a formed at one end of a differential case 18 of a center differential 17 provided at the rear thereof, so that the rotation of the input shaft 16 is directly transmitted to the differential case 18. At the front end of the input shaft 16, there is an input gear 20 that meshes with the output gear 19 of the reduction gear system of the high/low adjustment mechanism described above, a spline (not shown) provided on the output shaft 15, and a high/low switching sleeve. A spline 21 that engages and disengages through the sleeve is integrally formed with the output shaft 1.
When the spline 5 and the spline 21 of the input shaft 16 are combined, the rotation of the output shaft 15 is directly caused by the rotation of the input shaft 16.
The output shaft 15 is transmitted to the output shaft 15 by the sleeve.
When the reduction gear system and the reduction gear system are coupled, the rotation of the output shaft 15 is reduced by the reduction gear system and transmitted to the input shaft 16.

The rear wheel side output shaft 2 is fitted with a spline to the side gear 22 near the transmission of the center differential 17.
3 are directly connected to each other, and the rear end portion of this rear wheel side output shaft 23 is connected to the rear divided case portion 2 of the transfer shaft 24.
The front end of the output shaft 23 on the rear wheel side is supported by a bearing 26 provided on the boss 25 of 4a, while the front end of the output shaft 23 on the rear wheel side is supported by a needle bearing 27 interposed between this front end and the input shaft 16 externally fitted thereto. Supported by

On the other hand, the input shaft 16 is connected to the transfer case 24
A boss 28 located near the front end of the intermediate split case portion 24b adjacent to the rear split case portion 24a.
The connecting portion 18a of the differential case 18, which is supported by a bearing 29 provided in the input shaft 16 and is spline-fitted to the input shaft 16, is fastened and fixed with a bolt 30 near the boss 28 of the intermediate split case portion 24b. It is supported by another bearing 32 provided in a cylindrical retainer 31.

A front wheel output gear 34 is directly connected to the side gear 33 on the rear side of the center differential 17 by spline fitting, and the rotation of the front wheel output gear 34 is transmitted to the front wheels from a front wheel drive shaft (not shown) via a chain 35. is configured to communicate. In addition, the front wheel side output gear 34 has a lock and
A spline 38 that engages and disengages with a spline 37 formed on the differential case 18 is integrally formed through the free switching sleeve 36, and the sleeve 3
6 is a spline 37,3 as shown in phantom in the figure.
When the splines 37 and 38 are engaged, a center differential lock is created in which the front wheels and rear wheels are directly connected. On the other hand, when the splines 37 and 38 are disconnected, the difference in rotation between the front and rear wheels is caused by the difference in rotation between the front and rear wheels. The center differential is absorbed by rotation and becomes free.

Further, an oil hollow part 40 is formed in the axial center of the rear wheel side output shaft 23, and this hollow part 40
The oil passages 41 extend from the input shaft 16, the center differential 17, and the front wheel side output gear 34 to each mounting part.
a, 41b, 41c, 41d, and 41e are formed. Furthermore, an oil passage 41g is also formed in the input shaft 16 and the connecting portion 18a of the differential case 18 that is spline-fitted thereto, and a cylindrical retainer 31 is provided with a bearing 32 that supports the connecting portion 18a of the differential case 18. An oil guide hole 31a is formed in the upper side of the oil guide hole 31a in the radial direction. The oil guide pipe 42 disposed inside the transfer case 24 in the axial direction thereof has a
An oil spout 42a is formed toward the oil guide hole 31a of the upper retainer 31, and the oil guide pipe 42 receives and collects the lubricating oil scraped up by each gear of the transfer, and this lubricating oil is passed through the oil spout. By dropping oil from 42a toward the oil guide 31a at the top of the retainer 31,
The oil is collected into the hollow portion 40 of the rear output shaft 23 through oil passages 41g and 41a. Since the oil spout 42a of the oil guide pipe 42 and the oil guide hole 31a at the top of the retainer 31 are not fixedly connected, the assembly of the transfer shaft is facilitated, and the degree of freedom in the installation location of the oil guide pipe 42 is increased, facilitating design. It has the advantage of becoming Another spout 42b is formed on the rear side of the oil guide pipe 42, and lubricating oil can also be supplied to the rear end side of the rear wheel output shaft 23 from this spout 42b. Further, the bearings 29 and 32, which form part of the wall surrounding the lubricating oil introduction path from the oil guide hole 31a of the retainer 31 to the hollow portion 40 of the rear wheel side output shaft 23, are filled with lubricating oil. A ring-shaped oil reservoir space is formed around the rear output shaft 23 by the inner peripheral surface of the retainer 31 and the side surfaces of the bearings 29 and 32.
It is formed in an almost liquid-tight state. Therefore, the lubricating oil collected in the oil guide pipe 42 can be efficiently introduced into the hollow portion 40.

In addition, if the bearings 29 and 32 are not ball bearings as shown in the figure, but the rear wheel output shaft 23 is rotatably inserted into a normal bearing hole, the almost liquid-tight state will be maintained as is. Since the seal 43 is maintained, the seal 43 is not required.

Note that the transfer case 24 includes a rear divided case portion 24a that is divided at a location indicated by the symbol A;
In addition to the intermediate split case part 24b, the front split case part (not shown) is divided into three sections at the location indicated by the reference numeral B, and these sections are assembled together by stay bolts 45.

In the transfer store having the above configuration, the lubricating oil scraped up by each gear is transferred to the oil guide pipe 42.
A part of it is once collected from the spout 42a to the oil guide hole 31a of the retainer 31 and the oil passage 41.
g, 41a, and is supplied to the hollow portion 40 of the axial center of the rear wheel side output shaft 23. Then, as the rear wheel side output shaft 23 rotates, the lubricating oil in the hollow portion 40 flows through the oil passage 41.
b, 41c, 41d, and 41e to each gear. That is, axial center lubrication is performed for each gear. Therefore, as in the case of the center differential 17, the side gears 22, 33 and pinion 39, which are surrounded from the outside by the differential case 18, are also sufficiently lubricated. Note that lubricating oil is directly supplied to the rear end side of the rear wheel side output shaft 23 from another spout 42b of the oil guide pipe 42.

Furthermore, in this transfer, lubricating oil is supplied to the hollow portion 40 from the front end side of the rear wheel side output shaft 23 via the retainer 31. 4
In wheel drive vehicles, it is customary to install the shaft in a position that is tilted slightly downward toward the rear.
The lubricating oil supplied to the gear is sufficiently distributed to each gear,
This will further improve the lubrication effect.

(Effects of the invention) As described above, according to the lubrication structure of the vehicle transfer of this invention, the oil sump space using the bearing support retainer is configured almost liquid-tight, and the oil is collected by the oil collection guide member. Since the lubricating oil is supplied to the oil reservoir space, the lubricating oil can be reliably supplied to the intermediate portion of the transfer shaft with an extremely simple structure, and efficient shaft center lubrication is possible.

Furthermore, the lubricating oil collected by the oil recovery guide member is supplied to the oil reservoir space by dripping into the guide hole at the top of the retainer, so there is no need to form a special oil path, and assembly is easy. This has the advantage of increasing flexibility in the installation location of the oil recovery guide member and facilitating design.

[Brief explanation of the drawing]

The figure is a sectional view showing the main parts of a transfer to which a lubrication structure is applied, which is an embodiment of the invention. 23... Rear wheel side output shaft, 31... Retainer, 3
1a... Oil guide hole, 40... Oil hollow part, 41a, 41g... Oil path, 42... Oil guide pipe (oil recovery guide member).

Claims (1)

[Claim for Utility Model Registration] A structure for circulating lubricating oil in a vehicle transfer, which forms a hollow part into which the lubricating oil flows in the axial center of the transfer shaft, and an oil inflow path and an oil outflow path that communicate with the shaft surface; a cylindrical bearing support retainer provided to surround the shaft at the position of the oil inflow path; and a gear train of the transfer gear. is placed above the
an oil recovery guide member for recovering scattered lubricating oil; the inner circumferential surface of the retainer, a bearing member supported by the retainer, and a surface of a shaft supported by the bearing member; , forming an almost liquid-tight oil reservoir space, and providing a guide hole in the upper part of the retainer;
an oil circulation path in which the lubricating oil collected by the oil recovery guide member is dropped into the guide hole and injected into the oil reservoir space, and the lubricating oil is supplied to the hollow portion via the oil inflow path; A lubrication structure for a vehicle transfer, characterized by forming a lubrication structure.