JPH0448975Y2 - - Google Patents

Description

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

(Prior art and its problems) FIG. 2 shows a mechanical diagram of a vehicle transfer to which a conventional shaft support structure is applied.

This transfer is applied to a four-wheel drive vehicle configured to have an engine placed vertically at the front and drive the front wheels in a U-turn. The rotation of the input shaft 4 is transmitted to the input shaft 4 via the adjustment mechanism 3, and the rotation of the input shaft 4 is transmitted to the differential case 6 of the center differential 5. Furthermore, a rear wheel side output shaft 8 is directly connected to one side gear 7 of the center differential 5, while a front wheel side output gear 10 is directly connected to the other side gear 9 of the center differential 5, that is, the side gear 9 closer to the transmission 1. , the rotation of the rear wheel side output shaft 8 is transmitted to the rear wheels, and the rotation of the front wheel side output gear 10 is transmitted to the chain 1.
1. The signals are transmitted to the front wheels via gears 12. And the differential case 6 of the center differential 5 mentioned above.
When the front wheel side output gear 10 and the front wheel side output gear 10 are connected via the sleeve 13, the front wheel and the rear wheel are directly connected in the center differential lock mode, and when the differential case 6 and the front wheel side output gear 10 are disconnected, the front wheel It is configured so that four-wheel drive can be performed in a center differential-free mode in which the center differential 5 absorbs the difference in rotation between the rear wheels and the rear wheels.

However, in the above transfer, the chain 11 for driving the front wheels in a U-turn is connected to the center differential 5.
Since it is disposed closer to the transmission 1, that is, closer to the front, there is a problem that the intersection angle of the front wheel drive shaft 14 becomes larger accordingly.

One way to improve this is to
1 may be set to the rear side of the center differential 5, for example, but in this case, the rear wheel side output shaft 8 and the front wheel side output gear 10 are directly connected to the two side gears 7, Between 9 and 9, the positional relationship is opposite to that of the prior art example, and the rear wheel side output shaft 8 must be extended forward, that is, toward the transmission 1 considerably. Therefore,
In order to improve the intersection angle of the front wheel drive shaft 14, a critical issue is how to support the shaft without impairing the assemblability of the transfer shaft.

(Purpose of the invention) This invention was made in order to solve the above problem, and it impairs the ease of assembling the transfer shaft support by improving the intersection angle of the front wheel drive shaft that drives the front wheels in a U-turn. It is an object of the present invention to provide a shaft support structure for a vehicle transfer that can be carried out without any problems.

(Means for Achieving the Object) In order to achieve the above object, the shaft support structure of the vehicle transfer of this invention includes an input shaft for inputting the rotational output of the transmission through a high/low adjusting mechanism; A center differential that inputs the rotation of this input shaft as rotation of the differential case, a rear wheel side output shaft that is directly connected to one side gear of this center differential and transmits the rotation to the rear wheels, and a rear wheel side output shaft that is directly connected to one side gear of this center differential and transmits the rotation to the rear wheels. Equipped with a front wheel side output gear that is directly connected and transmits the rotation to the front wheel side through a chain,
In a vehicle transfer, which is capable of performing four-wheel drive by switching between two modes, center differential lock and center differential free, by engaging and disengaging between the differential case and the front wheel side output gear,
The center differential is disposed between the input shaft and the front wheel side output gear, and one end of the rear wheel side output shaft is supported by a bearing provided in the input shaft that is externally fitted to this end, and the rear wheel side output shaft is The other end of the side output shaft is supported by a bearing provided on a boss of a first case portion of the transfer, and the input shaft is provided on a boss of a second case portion separated from the first case portion. In addition, a retainer is provided in the second case part, and the bearing provided in this retainer supports the connection part of the differential case that is integrally connected to the input shaft, thereby reducing the number of case divisions. The structure is such that the transfer can be easily assembled under the following conditions.

(Embodiment) FIG. 1 shows a cross-sectional view of the main part of a transfer to which a shaft support 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. In other words, the rotational output of the output shaft 15 of the transmission is at a high level (not shown).
The input shaft 16 inputted via the low adjustment mechanism is
A cylindrical connecting portion 18 formed at one end of the differential case 18 of the center differential 17 provided behind it.
A is spline-fitted with the input shaft 16 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 8, 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 rear side gear 33 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 the spline 3 as shown by the phantom line in FIG.
When the splines 7 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 transferred to the pinion of the center differential 17. The center differential is free, which is absorbed by the rotation of 39.

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
Oil passages 41 extend from the input shaft 16, the center differential 17, and the front wheel side output gear 34 to the mounting portions thereof.
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 retainer 31, and the oil scooped up by each gear of the transfer is received by the oil guide pipe 42, and the oil is poured from the oil guide hole 31a of the retainer 31. , oil path 41g,
41a and is collected into the hollow portion 40 of the rear wheel side output shaft 23. The oil guide pipe 42 has another spout 42 on its rear side.
b is formed so that oil can also be supplied to the rear end side of the rear wheel side output shaft 23 from this spout 42b. Additionally, oil leaks from the bearings 29 and 32, which constitute a part of the wall of the oil introduction path from the oil guide hole 31a of the retainer 31 to the hollow part 40 of the rear wheel side output shaft 23. A seal 43 is attached to each of them so that there is no leakage. The open front end portion of the hollow portion 40 is sealed by a plug 44 fitted to the end of the input shaft 16.

Note that the transfer case 24 is divided into a rear divided case portion 2 at a location indicated by the symbol A in FIG.
4a, an intermediate split case part 24b, and a front split case part (not shown) which is divided at the point indicated by reference numeral B in the same figure, and these sections are assembled together by stay bolts 45. ing.

(Effect of the invention) As described above, according to the shaft support structure of the vehicle transfer of this invention, the chain for driving the front wheels in a U-turn is disposed on the rear side of the center differential, and the intersection angle of the front wheel drive shafts is The bearings that support the rear wheel output shaft and other shafts are placed in positions where they can be assembled by simply dividing the transfer case into three parts, making it possible to divide the transfer case into multiple parts. The effect is that the crossing angle of the front wheel drive shafts can be improved without having to do so.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the main parts of a transfer to which a shaft support structure is applied, which is an embodiment of this invention;
FIG. 2 is a mechanical diagram showing a conventional example. 16...Input shaft, 17...Center differential, 18
...Differential case, 18a...Connection part, 22...Side gear, 23...Rear wheel side output shaft, 24a...Rear split case part (first case part), 24b...
Intermediate split case part (second case part), 25...
...Boss, 26...Bearing, 27...Bearing, 28...
Boss, 29...bearing, 31...retainer, 32...
...Bearing, 33...Side gear, 34...Front wheel side output gear, 35...Chain.

Claims (1)

[Scope of utility model registration request] An input shaft that inputs the rotational output of the transmission via a high/low adjustment mechanism, a center differential that inputs the rotation of this input shaft as rotation of the differential case, and a side gear that is directly connected to one side gear of this center differential and transmits the rotation. A rear wheel side output shaft that transmits the transmission to the wheels, and a front wheel side output gear that is directly connected to the other side gear of the center differential and transmits the rotation to the front wheels through a chain, and the differential case and the front wheel output gear are connected to each other. In a vehicle transfer that enables four-wheel drive by switching between two modes, center differential lock and center differential free, by engaging and disengaging the center differential, the center differential is connected between the input shaft and the front output gear. One end of the output shaft on the rear wheel side is supported by a bearing provided in the input shaft externally fitted on this end, and the other end of the output shaft on the rear wheel side is supported on the first side of the transfer shaft. the input shaft is supported by a bearing provided on a boss of a second case portion separated from the first case portion; 1. A shaft support structure for a vehicle transfer shaft, characterized in that a retainer is provided in the retainer, and a bearing provided in the retainer supports a connecting portion of the differential case that is integrally connected to the input shaft.