JPH0741966Y2 - Transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a transfer device for distributing power from a transmission to front wheels and rear wheels.

(Prior Art) Generally, a transfer device of this type is disclosed, for example, in Japanese Utility Model Publication No. 61-1.
As shown in Japanese Patent No. 85618, a transfer case rotatably supports an input shaft directly connected to an output shaft of a transmission and an output shaft linked with front wheels or rear wheels via an upper bearing, and A high / low switching clutch mechanism is provided between the shafts, and a first counter gear that meshes with an input gear provided on the input shaft is provided below the both shafts.
A counter shaft provided with a second counter gear that meshes with the output gear provided in the output gear is arranged, and both ends of the counter shaft are rotatably supported by the transfer case via lower bearings. There is.

(Problems to be solved by the invention) By the way, as a method of incorporating a power take-off device in the above transfer device, for example, a shaft parallel to the counter shaft is rotatably supported in the transfer case, and the power take-off device is mounted on the shaft. A method of fixing the drive gear and meshing the drive gear with the counter gear is conceivable. However, in the structure described above, a storage space for the counter gear and the shaft supporting the gear is further provided in the transfer case. It is necessary to secure it, and there is a problem that the transfer case becomes large.

On the other hand, in the above transfer, an oil sump is provided at the bottom of the transfer case, and the counter gear is driven to splash up the lubricating oil stored in the oil sump so that the lubricating oil is applied to the lubrication part. However, the location where the lubricating oil is supplied is limited only by the splashing of the lubricating oil by the gear, and therefore the lubrication of the upper bearing that supports the input shaft or the output shaft is poor. It may be possible.

The present invention was developed in view of the above circumstances, focusing on the fact that there is a large dead space in the radial direction around the axis of the counter shaft between the counter gear and the bearing that supports the counter shaft, By incorporating a drive gear that constitutes a power take-off device in the dead space, lubrication of the bearing that rotatably supports the input shaft or the output shaft can be achieved at the same time without increasing the axial dimension of the transfer. The purpose is to provide a transfer device that can do this.

(Means for Solving the Problems) The present invention, however, supports the input shaft and the output shaft through the upper bearings in the transfer case having the oil sump at the bottom, and the high / low switching clutch between these shafts. A mechanism is provided, and a first counter gear that meshes with an input gear provided on the input shaft and a second counter gear that meshes with an output gear provided on the output gear are provided below the both shafts. In a transfer device in which a counter shaft is arranged and both ends of the counter shaft are rotatably supported via lower bearings, one of the counter gears in the counter shaft and the lower bearing facing the counter gear are provided. Between the upper bearing and the oil reservoir that can enter the oil sump It is characterized in that a drive gear for cut-off is provided.

(Operation) According to the present invention, the drive gear that constitutes the power take-off device is incorporated in a radially wide dead space existing around the axis of the counter shaft between the counter gear and the bearing that supports the counter shaft. Therefore, a drive gear having a large gear diameter can be arranged without causing an increase in the axial size of the transfer, and moreover, since the power take-off transfer gear is assembled to the counter shaft, the drive gear is supported. It is not necessary to separately prepare a shaft, and the drive gear causes the drive gear to splash up the lubricating oil in the oil sump, and the bearing of the input shaft or the output shaft arranged above the drive gear. Etc. are efficiently lubricated.

(Example) Hereinafter, a transfer device according to the present invention will be described with reference to an example shown in the drawings.

The transfer device shown in the figure includes a high / low switching clutch mechanism (1) for selecting high gear and low gear, and a 2/4 wheel switching clutch mechanism (2) for selecting 2 wheel drive and 4 wheel drive. A first storage chamber (32) for storing the high / low switching clutch mechanism (1) by partitioning the inside of the transfer case (3) with a partition wall (31).
And a second accommodating chamber (33) for accommodating the 2 / 4-wheel switching clutch mechanism (2), and lubricating oil is respectively applied to the inner bottom portions of the first and second accommodating chambers (32) (33). The oil sump (34) (35) for storing is provided.

An input shaft (4a) extending from a transmission (not shown) is rotatably supported in the first housing chamber (32) of the case (3) via a first upper bearing (41), and A rear output shaft (4b) is provided with second and third upper bearings (42) (43) on the extension axis of the input shaft (4a) from the first accommodation chamber (32) to the second accommodation chamber (33). It is rotatably supported via.

A first counter shaft (5) is provided below the iptt shaft (4a) in the first storage chamber (32).
It is rotatably supported via the second lower bearings (51) (52),
A front output shaft (4c) is rotatably supported below the rear output shaft (4b) in the second storage chamber (33) via bearings (44) (45).

Further, between the input shaft (4a) and the rear output shaft (4b) in the first storage chamber (32),
The high / low switching clutch mechanism (1) is provided. Specifically, the input gear (11) is attached to the input shaft (4a) by spline coupling, and the output gear is output to the rear output shaft (4b). The input gear (11) is supported by the first counter gear (53) provided on the counter shaft (5), and the output gear (12) is supported by the counter shaft. The second counter gears (54) provided in (5) are in mesh with each other.

A high / low clutch hub (13) is integrally formed on the shaft end of the rear output shaft (4b), and a high / low shift sleeve (14) is spline-coupled to the outer periphery of the high / low clutch hub (13). Is provided so as to be freely movable only in the axial direction, and a clutch gear (15) is provided on a side portion of the input gear (11) and the rear output gear (12).
(16) is integrally formed.

The high / low switching mechanism (1) above is based on the sleeve (1
4) is switched to high gear by engaging the high / low clutch hub (13) with the clutch gear (15) on the input gear (11) side, and the sleeve (14) is switched to the high / low clutch hub (13). 13) and the clutch gear (16) on the side of the rear output gear (12) to switch to a low gear, and further, the sleeve (14) is engaged only with the high / low clutch hub (13). , It can be switched to neutral.

Further, the rear output shaft (4b) in the first storage chamber (32) is provided with the 2 / 4-wheel switching mechanism (2) described above. Specifically, the rear output shaft (4) A clutch gear (21) is splined to 4b) and a 2/4 wheel switching clutch hub (23) provided with a 2/4 wheel switching sleeve (22) axially movable is rotated via a bearing (24). Freedom to support. A drive sprocket (25) is integrally formed on the side end of the 2/4 wheel switching clutch hub (23), and a driven sprocket (26) is integrally formed on the front output shaft (4c). (26)
The chain (27) is bridged over the gear, and the clutch gear (21) of the 2/4 wheel switching sleeve (22) meshes with the transmission to dispose the rear output shaft (4).
The power transmitted to b) is transmitted to the front output shaft (4c) via the chain (27).

Thus, in the embodiment shown in the figure with the above configuration, the second counter gear (54) in the counter shaft (5) and the second lower bearing (52) that rotatably supports the counter shaft (5) are provided. A drive gear (6) for power take-off having a diameter larger than that of the second counter gear (54) is fitted and fixed between the two, and the lower half of the drive gear (6) is attached to the first Oil sump (3) in the storage chamber (32)
It is submerged in the lubricating oil stored in 4).

Further, in the embodiment shown in the drawings, an idler shaft (61) and a power take-off output shaft (62) are provided below the counter shaft (5) in the first storage chamber (32) as bearings (63) (64). The output shaft for power take-off (6
The output gear (65) for power take-off is splined to 2) and the idler shaft (61)
Power take-off shift fork (not shown)
An idler gear (67) having a fitting groove (66) is movably supported in the axial direction by spline fitting, and the drive gear (6) and the power take-off output gear (65) of the idler gear (67) are supported. The driving force of the engine can be taken out to the outside through the output shaft (62).

Incidentally, (O) in the figure shows the lubricating oil surface housed in the oil sumps (34) (35).

In the transfer device having the above structure, the high / low shift sleeve (14) of the high / low switching clutch mechanism (1) is engaged only with the high / low clutch hub (13) to provide the clutch mechanism (1). Drive to the input shaft (4a) by switching the idler gear (67) to the drive gear (6) for power take-off and the output gear (65) for power take-off while switching the neutral position to neutral. The force is transmitted from the counter shaft (5) to the power take-off drive gear (6) and idler gear (6).
7), through the power take-off output gear (65), the power take-off output shaft (6
It is transmitted to 2) and taken out.

On the other hand, regardless of the shift position of the transfer, the driving force is always transmitted from the input shaft (4a) to the counter shaft (5) through the input gear (11). The drive gear (6) fixed to 5) also constantly rotates to splash up the lubricating oil in the oil sump (34), and the second upper bearing (4) located above the drive gear (6).
2) The lubricating oil is efficiently supplied to etc.

In the above embodiments, the power take-off is provided between the second counter gear (54) of the counter shaft (5) and the second lower bearing (52) that rotatably supports the counter shaft (5). Although the drive gear (6) is fitted and fixed, the first counter gear (53) and the counter shaft (5) in the counter shaft (5)
The drive gear (6) may be fitted and fixed between the drive gear (6) and the first lower bearing ((51), which rotatably supports the drive shaft. 5) may be integrally formed.

(Effect of the Invention) As described above, the present invention supports the input shaft and the output shaft via the upper bridges in the transfer case having the oil sump at the bottom, and provides the high / low switching clutch mechanism between these shafts. At the same time, a counter shaft having a first counter gear meshing with an input gear provided on the input shaft and a second counter gear meshing with an output gear provided on the output shaft is disposed below the shafts. Then, in a transfer device in which both ends of the counter shaft are rotatably supported via lower bearings, the counter shaft is provided between one of the counter gears and the lower bearing facing the counter gear. For power take-off that can face the upper bearing and enter the oil sump By providing the drive gear, the drive gear for power take-off can be arranged in a radially wide dead space existing around the axis of the counter shaft between the counter gear and the bearing supporting the counter shaft. Therefore, the gear diameter of the drive gear can be made sufficiently large to reduce the axial dimension of the drive gear. Therefore, the power take-off drive gear can be easily incorporated without increasing the axial dimension of the transfer. Moreover, since the transfer gear for power take-off is assembled to the counter shaft, it is not necessary to separately prepare a support shaft for the drive gear, and it is possible to reduce the number of parts and secure an installation space. Since there is no such thing, the transfer case can be made smaller, By the rotational drive of the counter shaft, the drive gear splashes up the lubricating oil in the oil sump, and the lubrication portion located above the drive gear, that is, the bearing supporting the input shaft or the output shaft, etc. It is now possible to reliably supply the lubricating oil.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a transfer device according to the present invention. (1) …… High / low switching clutch mechanism (3) …… Transfer case (34) …… Oil sump (4a) …… Input shaft (4b) …… Rear output shaft (5) …… Counter shaft (51) ...... First lower bearing (52) …… Second lower bearing (53) …… First counter gear (54) …… Second counter gear (6) …… Drive gear for power take-off

Claims (1)

[Scope of utility model registration request] An input shaft and an output shaft are supported by an upper bearing in a transfer case having an oil sump at the bottom, and a high / low switching clutch mechanism is provided between these shafts, and below the both shafts. A counter shaft provided with a first counter gear that meshes with an input gear provided on the input shaft and a second counter gear that meshes with an output gear provided on the output gear. In a transfer device in which both ends of the counter shaft are rotatably supported via lower bearings, one of the counter gears of the counter shaft and the lower bearing facing the counter gears face the upper bearings and A drive gear for power take-off that can enter the oil sump is provided. Transfer apparatus according to claim.