JP2002211262A - Vehicle transfer device - Google Patents

Abstract

(57) [Problem] To provide a compact vehicle transfer device that is easy to assemble, can be subassembled, and is compact. In a transfer apparatus of a gear train system, a transfer case (20) includes a deep dish-shaped member (22) having an open end in an axial direction and a closing member for closing the open end.
(24), the transfer device is an input shaft (4, 5),
Both ends of the counter shaft (8) and the output shaft (14) are pivotally supported by the deep dish-shaped member and the closing member, respectively, and sub-assembled into a transfer case, and the sub-assembled transfer case is used as a transmission case (1a). When mounted at the end of the transmission, the input shaft is connected to the output shaft (2) of the transmission.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer apparatus for a vehicle, and more particularly, to a transfer structure that facilitates assembly and is compact.

[0002]

2. Related Art In a four-wheel drive vehicle, a transfer is provided after a transmission in order to transmit driving force from an engine to both front wheels and rear wheels. As for the transfer, a transmission system in which the output shaft of the transmission and a propeller shaft extending to the front and rear wheels are connected via a chain, and a transmission system in which the output shaft of the transmission and the propeller shaft are connected via a counter gear are used. The gear train type transfer is widely used.

Referring to FIG. 4, there is shown a sectional view showing a conventional gear train type transfer. As shown in FIG. 1, an input shaft 104 is coupled to an end of an output shaft 102 of a transmission (T / M) 100 by a lock nut 106 so as to be able to rotate synchronously with the output shaft 102.
Around 8 is provided a counter gear 110 composed of small-diameter teeth 110a and large-diameter teeth 110b so as to be rotatable via a pair of bearings 109 and 109 and to mesh with the input gear 104a of the input shaft 104. An output gear 112 is provided so as to mesh with the counter gear 110.

The output gear 112 is a large-diameter gear 11 having a large number of teeth.
2a and a small gear 112b having a small number of teeth are rotatably provided around the output shaft 114 connected to the propeller shaft through needle bearings 111a and 111b, respectively. The gear 112b meshes with the small-diameter teeth 110a or the large-diameter teeth 110b of the counter gear 110, respectively. A sleeve 118 is fitted around the outer periphery of the hub portion 116 of the output shaft 114 so as to be slidable in the axial direction of the output shaft 114, and the sleeve 118 is slid to operate on the large-diameter gear 112a side or the small gear. When it is moved to the 112b side, the engagement between the output shaft 114 and each of the gears 112a and 112b is selectively achieved, whereby switching between a high speed stage and a low speed stage, that is, high (H) / low (L) switching. Done.

[0005] The tip 102a of the output shaft 102 of the transmission 100 is supported by a transfer case 120 via a needle bearing 103, and the counter shaft 10
8 are also supported by the transfer case 120, and the output shaft 114 is also provided with a pair of bearings 115, 1
15 and is supported by the transfer case 120.

Incidentally, in such a gear train type transfer, in order to prevent uneven wear and abnormal noise of the gear, the rotation axis of the output shaft 102 of the transmission 100, the axis of the counter shaft 108, and the output shaft 114 are prevented. Need to be supported by the transfer case 120 so that the rotation axes of the transfer case are parallel. Accordingly, in order to accurately center the three axes, the transfer case 120 is required.
For this purpose, a casting capable of integrally forming the support portions of the shafts 102, 108, 114 is employed.

[0007] Thus, by fixing the transfer case 120 on the jig and performing drilling from one direction, the rotation axis of the output shaft 102, the axis of the counter shaft 108, and the rotation axis of the output shaft 114 can be accurately determined. Centering can be performed. In FIG. 4, each shaft 102, 1
One of the support portions 08 and 114 is supported separately from the main body of the transfer case 120.
This is due to the convenience of work for inserting and passing through the output shaft 114. Even in such a case, it is necessary to accurately center the fitting portion between the separate body and the main body. That is no different.

[0008]

However, when the transfer case is made of a casting as described above, the core must be used in the casting process, and the man-hour for producing the core and discharging the core after casting is reduced. There is a problem that casting cost is required. Further, in such an integrally formed transfer case, an opening is provided on one side of the shaft where the support portion of each shaft is not formed, and a gear or the like is mainly inserted from the opening to sequentially perform an assembling operation. Like that. However, since this opening is narrow, it is difficult to assemble it, and there is a problem that the number of assembling steps is large.

Further, as shown in FIG. 4, in the conventional transfer, the input shaft 104 is connected to the output shaft 102 of the transmission 100.
Since the countershaft 108, the output gear 112, and the like can be pre-assembled in the transfer case 102 in advance, the transfer of the input shaft 104
At the time of assembling, the assembly work must be performed, and the entire transfer cannot be sub-assembled, which also has a problem that the number of assembly steps is large.

On the other hand, the propeller shaft is connected to a differential gear, but the differential gear on the axle side is disposed lower than the transfer on the vehicle body side in consideration of vertical movement of the vehicle body during traveling. It extends with a constant intersection angle (depression angle) with respect to the rotation axis of the output gear of the transfer. If the positions of the transmission and the differential gear are constant, the intersection angle increases as the length of the transfer case in the axial direction increases. However, in general, the larger the angle of intersection, the greater the fluctuation in the rotation speed of the propeller shaft and the greater the vibration and noise. Therefore, it is preferable to make the transfer case as short and compact as possible in the axial direction.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a compact vehicle transfer device which is easy to assemble, can be subassembled, and is compact.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, an output of a transmission is provided at an end of a transmission case to an input shaft. A transfer device for a vehicle, wherein a counter shaft and an output shaft are arranged in a transfer case in parallel with each other,
The transfer case comprises a deep dish-shaped member having an open end in the axial direction and a closing member for closing the open end,
Each of the input shaft, the counter shaft and the output shaft is configured such that the counter gear of the counter shaft is engaged with the input gear of the input shaft and the output gear of the output shaft is engaged with the counter gear. Both ends are pivotally supported by the deep dish-shaped member and the closing member, respectively, and are sub-assembled into the transfer case.When the sub-assembled transfer case is attached to the end of the transmission case, the input shaft is The transmission is connected to an output shaft of the transmission.

[0013] That is, the transfer case has a "monad-like" structure in which the deep dish-shaped member, which is one case, and the closing member, which is the other case, are connected. Therefore, it is possible to easily insert and assemble all the components such as the input shaft, the counter shaft, the counter gear, the output shaft, and the output gear from the open end of the deep dish-shaped member, and it is extremely easy to make a sub-assembly. . As a result, the transfer case can be attached to the transmission only by the simple work of fixing the sub-assembled transfer case to the transmission while connecting the input shaft to the output shaft of the transmission, improving workability. I do.

[0014] Further, by making the transfer case in the "monaka-shaped" structure, it is not necessary to use a core as in the conventional case, and the number of casting steps is reduced. Further, the transfer case can be made of an aluminum alloy and formed into an aluminum die-cast, thereby making it possible to reduce the weight of the transfer. It should be noted that the present invention is realized by a dramatic improvement in processing accuracy by an NC machine or the like. In other words, if the transfer case is divided into one case and the other case to form a “mono” structure, the shaft hole processing is performed individually for each of the one case and the other case. Even in such a case, high-precision machining can be performed by the NC machine or the like, and accurate centering can be performed on the three axes of the input shaft, the counter shaft, and the output shaft.

According to the second aspect of the present invention, the output shaft of the transmission is supported by the transmission case via a bearing, and is integrated with an inner race of the bearing by a lock nut. One end of a shaft portion of the input shaft is supported by the deep dish-shaped member of the transfer case via a bearing, and an outer peripheral portion extends to the transmission side over the entire periphery to cover the lock nut. An oil seal is fitted between the outer peripheral extension and the deep dish-shaped member.

Accordingly, as described above, when the input shaft is sub-assembled into the transfer case, a bearing is required to support one end of the shaft portion of the input shaft to the transfer case. An oil seal is required between the shaft and one end of the input shaft to prevent leakage of lubricating oil to the outside.
Therefore, the transfer case tends to be longer in the axial direction, but the lock nut necessary for fixing the output shaft of the transmission is sunk into the input shaft so that the oil seal is radially outside the lock nut. The lock nut and the oil seal do not have to be arranged in series.

As a result, the length of the transfer case in the axial direction is shortened as much as possible to make the transfer compact, so that the intersection angle of the propeller shaft is not increased, and fluctuations in the rotational speed of the propeller shaft are suppressed, resulting in vibration and noise. Is prevented.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Referring to FIG. 1, there is shown a cross-sectional view of a transfer device for a four-wheel drive vehicle according to the present invention. Hereinafter, a transfer device for a vehicle according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the vehicle transfer apparatus according to the present invention comprises a gear train type transfer 3 which is directly attached to a transmission 1, and the transfer 3 has an input shaft 4 and a counter gear as in the prior art. 10 and output gear 1
It consists of two triple gears. Specifically, a counter gear 10 including a small-diameter tooth 10a and a large-diameter tooth 10b is provided around a counter shaft 8 so as to be rotatable through a pair of tapered bearings 9 and 9 and to mesh with the input gear 4a of the input shaft 4. An output gear 12 is provided so as to mesh with the counter gear 10.

The output gear 12 is a large-diameter gear 12a having a large number of teeth.
And two small gears 12b having a small number of teeth are connected to the front and rear wheels (W
Output shaft 14 connected to propeller shaft for F, WR)
The large-diameter gears 12a are rotatably provided around needle gears 11a and 11b, respectively.
The small gear 12b meshes with the small-diameter tooth 10a or the large-diameter tooth 10b of the counter gear 10, respectively. A sleeve 18 is fitted around the outer periphery of the hub 16 of the output shaft 14, and the sleeve 18 is slidable on the outer periphery of the hub 16 in the axial direction of the output shaft 14. That is, when the sleeve 18 is slid to either the large-diameter gear 12a or the small gear 12b, the engagement between the output shaft 14 and each of the gears 12a and 12b is selectively achieved. Switching between a low speed stage and a low speed stage, that is, high (H) / low (L) switching is possible.

The shaft 5, the counter shaft 8, and the output shaft 14 of the input shaft 4 configured as described above are supported by the transfer case 20. In the present invention, the transfer case 20 includes two cases: a half case (deep dish-shaped member) 22 in which the entire surface on one side is opened as an open end, and a half case (closing member) 24 provided to close the opening. The opening peripheral portion 23 and the opening peripheral portion 25 are in contact with each other over the entire circumference, and the bolt 26
To be integrated. That is, the transfer case 20 is divided into a half case 22 and a half case 24, and is configured in a “monaka” shape.

That is, one end 5a of the shaft portion 5 of the input shaft 4 and one end 14a of the output shaft 14 are supported by the half case 22 via the ball bearings 6 and 15, respectively. It is supported by the half case 22. On the other hand, the other end 5b of the shaft portion 5 of the input shaft 4 and the other end 14b of the output shaft 14 are supported by the half case 24 via the ball bearings 7 and 15, respectively. It is supported by the half case 24.

The transfer case 20 is composed of a half case 22 and a half case 24 in the shape of "mono", and one end 5a of the shaft portion 5 of the input shaft 4, the counter shaft 8, and the output shaft 14.
Are supported by one half case 22 and the other ends 5b, 8b, 14b are supported by the other half case 24, the shaft 5 of the input shaft 4, the counter shaft 8 However, the accuracy of each axis of the output shaft 14, that is, the machining accuracy of the hole machining of each support portion, becomes a problem. In this regard, the centering with high accuracy is possible by the spread of the NC machine.

More specifically, a half case 2 by an NC machine is used.
A hole is drilled in each of the support portions for each of the cases 2 and 24, and a pair of knock holes having the same positional relationship with respect to each axis are formed in the opening peripheral portions 23 and 25 with high accuracy in each of the half cases 22 and 24. Two holes are drilled in advance, and a knock pin is inserted into a pair of knock holes at these two positions during assembly to perform positioning. This makes it possible to accurately center each axis.

Then, the transfer case 2
If the “0” is formed in a “middle shape” by the half case 22 and the half case 24, the input shaft 4 and the counter shaft can be very easily formed through the opening at the open end of the half case 22 or the opening of the half case 24 in the assembling process. 8, components such as the counter gear 10, the output shaft 14, and the output gear 12 can be inserted and assembled. Therefore, the number of assembling steps is greatly reduced.

Also, unlike the prior art, the input shaft 4
When the transfer case 20 also supports the shaft portion 5 of the input shaft 4, the input shaft 4, the counter shaft 8, the counter gear 10,
All parts such as the output shaft 14 and the output gear 12 can be subassembled, that is, the transfer 3 can be configured as one transfer unit. Accordingly, the work on the main production line is performed by connecting only the transmission 1 and the transfer unit, that is, shifting the transfer case 20 while connecting the tip of the output shaft 2 of the transmission 1 to the shaft portion 5 of the input shaft 4. Only a simple operation of attaching to the case 1a of the machine 1 is required, and workability is remarkably improved.

Further, when the transfer case 20 is divided into a "monaka shape", it is not necessary to use a core as in the prior art when casting the half cases 22 and 24.
The man-hour for making the core and the man-hour for removing the core are eliminated, and the man-hour for casting is also reduced. Furthermore, if the transfer case 20 can be divided into a "monaka-shape", a die-casting method can be performed, the transfer case 20 can be made of aluminum die-cast using an aluminum alloy, and the weight of the transfer 3 can be reduced.

Referring again to FIG. 1, the tip of the output shaft 2 of the transmission 1 projects from the transmission 1 while the input shaft 4
A fitting hole 5c is formed in the shaft portion 5 along the shaft.
Specifically, the tip of the output shaft 2 is connected to the fitting hole 5c via serrations. As shown in the figure, the output shaft 2 of the transmission 1 is supported by a case 1a of the transmission 1 via a ball bearing 2b, and the output shaft 2 is fixed to the inner race of the ball bearing 2b.
A lock nut 2a is externally fitted to the output shaft 2 and screwed thereto. That is, the lock nut 2 a projects from the transmission 1 together with the output shaft 2 and bites into the transfer 3. On the other hand, one end 5a of the shaft portion 5 of the input shaft 4 has an outer peripheral portion extending toward the transmission 1 over the entire periphery to form an outer peripheral extension portion 5d.
Specifically, the outer peripheral extension 5d extends so as to overhang and cover the lock nut 2a. That is, the lock nut 2a that has bitten into the transfer 3 is substantially housed in a space formed inside the shaft portion 5 of the input shaft 4.

An oil seal 28 is provided between the outer peripheral extension 5d and the half case 22 of the transfer case 20 so as to be fitted on the shaft 5 to prevent leakage of lubricating oil.
Is provided. More specifically, the inner diameter of the oil seal 28 is larger than the outer diameter of the lock nut 2a, and the large-diameter oil seal 28 overlaps the lock nut 2a outside the lock nut 2a when viewed from the radial direction (see FIG. (Polymerization).

Thus, the dimension of the transfer case 20 in the axial direction is shortened by the overlap of the oil seal 28 and the lock nut 2a, and the transfer 3 is made compact. Therefore, the angle of intersection of the propeller shaft described above can be prevented from increasing, and fluctuations in the rotation speed of the propeller shaft can be suppressed to prevent vibration and noise.

In the above embodiment, the case where the half case 22 and the half case 24 are divided at the division point A substantially at the center of the transfer case 20 in the axial direction has been described as shown in FIG. However, as another embodiment, as shown in FIG. 2, as a transfer, a half case 22 ′ and a half case 24 ′ are divided at a division point A ′ that is deviated to one side from substantially the center in the axial direction. Transfer 3 '.

In some vehicles having a PTO device, the driving force of the engine is transmitted from the rear end of the shaft portion 5 of the input shaft 4 to the PTO device side. As shown in FIG. There is also a transfer 3 ″ in which a support portion at the other end of the shaft portion 5 is detachably provided separately. However, the present invention can be applied to the transfer 3 ″ of such a modified embodiment without any problem.

[0033]

As described above in detail, according to the vehicle transfer apparatus of the first aspect of the present invention, the transfer case is made up of the deep dish-shaped member as one case and the closing member as the other case. Since it has a "monaka" structure that can be connected, all components such as the input shaft, counter shaft, counter gear, output shaft, output gear, etc. are inserted from the open end of the deep dish-shaped member and easily assembled. And subassembly is extremely easy.

In addition, since the transfer case has such a "monaka-shaped" structure, it is not necessary to use a core as in the conventional case, and the number of casting steps can be reduced. Furthermore, the material of the transfer case can be aluminum die-cast as an aluminum alloy,
This makes it possible to reduce the weight of the transfer.

According to the vehicle transfer apparatus of the second aspect, when the input shaft is subassembled into the transfer case, a bearing for supporting one end of the shaft portion of the input shaft to the transfer case and the oil seal are connected in series. Although the transfer case tends to be longer in the axial direction, the lock nut required for fixing the output shaft of the transmission is sunk into the input shaft so that the oil seal can be adjusted to the radius of the lock nut. The lock nut and the oil seal do not need to be arranged in series, and the length of the transfer case in the axial direction can be made as short as possible to make the transfer compact. Thus, the intersection angle of the propeller shaft can be prevented from increasing, and fluctuations in the rotation speed of the propeller shaft can be suppressed to prevent vibration and noise.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vehicle transfer device according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the vehicle transfer device according to the present invention.

FIG. 3 is a sectional view showing a modified embodiment of the transfer device for a vehicle according to the present invention.

FIG. 4 is a cross-sectional view showing a conventional transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission 2 Transmission output shaft 2a Lock nut 2b Ball bearing 3 Transfer 4 Input shaft 5 Shaft 5d Outer peripheral extension 6 Ball bearing 7 Ball bearing 8 Counter shaft 9 Tapered bearing 10 Counter gear 12 Output gear 14 Output shaft 20 Transfer Case 22 Half case (deep dish-shaped member) 23 Opening edge 24 Half case (closing member) 25 Opening edge 28 Oil seal

Continued on the front page (72) Inventor Takashi Maruo 4-21-1, Shimomaruko 4-chome, Ota-ku, Tokyo F-term in Mitsubishi Automotive Engineering Co., Ltd. (reference) 3D043 AB17 EA02 EA12 EA32 EA35 EA39 EC01 EC03 3J009 DA13 EA04 EA05 EA11 EA21 EA35 EA44 EC06 FA03 3J063 AA01 AB02 AC01 AC03 BA01 BA03 BA04 BB03 BB27 CA01 CB13 CB14 CB41 CB44 CD02 CD03 CD42 CD45 CD53 CD63 XA03 XA08

Claims (2)

[Claims] 1. A transfer system for a vehicle, wherein an output of a transmission is transmitted to an input shaft at an end of a transmission case, and the input shaft, the counter shaft, and the output shaft are arranged in a transfer case in parallel with each other. The transfer case comprises: a deep dish-shaped member having an open end in an axial direction; and a closing member for closing the open end, wherein a counter gear of the counter shaft is engaged with an input gear of the input shaft. And the output gear of the output shaft is engaged with the counter gear so that both ends of the input shaft, the counter shaft, and the output shaft are pivotally supported by the deep dish member and the closing member, respectively. Then, when the sub-assembled transfer case is attached to the end of the transmission case, the input shaft is moved out of the transmission case. A transfer device for a vehicle, wherein the transfer device is configured to be coupled to a power shaft. 2. An output shaft of the transmission is supported by the transmission case via a bearing, and is integrated with an inner race of the bearing by a lock nut, while one end of a shaft portion of the input shaft is provided. Forming an outer peripheral extension portion that is supported by the deep dish-shaped member of the transfer case via a bearing and an outer peripheral portion extends to the transmission side over the entire periphery and covers the lock nut;
2. The vehicle transfer device according to claim 1, wherein an oil seal is fitted between the outer peripheral extension and the deep dish-shaped member.