JPH0996345A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of gear sound and vibration by selectively combining a low reduction gear or a high reduction gear with an output shaft without dividing the output shaft, reducing parts in number, also making its constitution simple, and reducing the displacement and jiggling of each shaft center. SOLUTION: This power transmission device is provided with an input shaft 18 inputting driving force from an engine, an output shaft 28 over a shaft center identical to the input shaft 18, a counter shaft 40 in parallel with the input shaft 18 and the output shaft 28, a forward step gear, both a synchronizing mechanism and a reverse step gear in between the input shaft 18 and the counter shaft 40, a direct connection step clutch in between the input shaft 18 and the output shaft 28, and with paired low reduction gears of a low reduction ratio each and paired high reduction gears of a high reduction ratio each, which are arranged in between the counter shaft 40 and the output shaft 28 in such a way as to be selectively combined with the output shaft 28 by a switching mechanism provided for the output shaft 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission device, and more particularly to a power transmission device which has a simple structure and can be made compact.

[0002]

2. Description of the Related Art In a vehicle, a transmission for converting a driving force of an engine into a required one according to a traveling condition and extracting the required driving force,
A power transmission device including a transfer and the like for distributing the driving force is provided.

Such a power transmission device is disclosed, for example, in Japanese Unexamined Patent Publication No. 5-65945. As shown in FIG. 3, the one disclosed in this publication is provided with a manual transmission main body 202, an auxiliary transmission 204, and a two-wheel / four-wheel switching mechanism 206, and a driving force from the engine is input to the input shaft 208.
Is transmitted to the auxiliary shaft 210 via a pair of speed change gears, and then is transmitted to the transmission main body output shaft 21 via a final reduction mechanism 212.
4 is transmitted.

[0004]

However, in the conventional power transmission device, as shown in FIG.
2 is provided with the transmission main body output shaft 214, and the auxiliary transmission 204 is provided with the auxiliary transmission output shaft 216. Therefore, two output shafts 214, 216 are required. The number of points increases, the configuration becomes complicated,
Further, there is a disadvantage that the axial misalignment and the shake become large, which causes a large generation of gear noise and vibration, and also becomes expensive.

[0005]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an input shaft for inputting the driving force from the engine, and an output shaft is provided on the same axis as the input shaft. A counter shaft is provided in parallel with the input shaft and the output shaft, a forward gear, a synchronization mechanism, and a reverse gear are provided between the input shaft and the counter shaft, and between the input shaft and the output shaft. A direct connection stage clutch is provided, and a pair of reduction speed gears having a reduction speed ratio and a high reduction speed are provided between the counter shaft and the output shaft so as to be selectively coupled to the output shaft by a switching mechanism provided on the output shaft. A pair of high speed reduction gears having a specific ratio are provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention selectively couples a high reduction gear or a reduction speed gear to an output shaft without dividing the output shaft, reduces the number of parts, and simplifies the construction. It is possible to reduce axial misalignment and shake, reduce gear noise and vibration, and reduce the cost.

[0007]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, 2 is a power transmission device mounted on a vehicle (not shown), 4 is a manual transmission, 6 is a transfer, 8 is a transmission front case,
10 is a transmission center case, 12 is a transmission rear case, 14 is a transfer front case, and 16 is a transfer rear case.

In the transmission 4, in the transmission center case 10 and the transmission rear case 12, an input shaft 18 for inputting a driving force from an engine (not shown) is held by a transmission front case wall 20. The first input bearing 22 and the second input bearing 26 held by the transmission center case wall 24
It is rotatably provided by and. Further, in the transmission rear case 12, the transfer front case 14, and the transfer rear case 16, the output shaft 28 located on the same axis as the input shaft 18 is held by the transmission rear case wall portion 30 of the transmission rear case 12. The first output bearing 32 and the second output bearing 34 held by the transfer case 16 are rotatably provided.

At the front end portion of the output shaft 28, the output shaft 2
A rear end portion of the input shaft 18 is rotatably provided by inserting a rear end portion of the input shaft 18 through a needle bearing 38 into an input shaft insertion hole 36 formed in a front end surface of the shaft 8.

Further, the transmission center case 1
0 and the transmission rear case 12 have a counter shaft 40 arranged in parallel with the input shaft 18 and the output shaft 28.
Are the first and second counter bearings 42, 44 held by the transmission front case wall, the transmission center case wall 20, 24 and the third counter bearing 4 held by the transmission rear case wall 30.
It is rotatably provided by 6.

Further, the transmission center case 1
A reverse idler shaft 48, which is arranged parallel to the input shaft 18, is installed in the transmission front case wall 2
0 and the shaft support 50.

As input forward gears, a first speed input gear 52 and a second speed input gear 54 are fixedly provided on the input shaft 18, and a third speed input gear 56 and a fourth speed input gear 58 are provided. Is rotatably provided, and further, a 5-speed direct coupling dock clutch 60, which is a direct coupling stage clutch, is spline-coupled in the transmission rear case 12.
Moreover, the reverse input gear 62 is fixedly provided as a reverse gear between the first speed input gear 52 and the second speed input gear 54. The 5-speed direct coupling dock clutch 60 is disposed between the rear end portion of the input shaft 18 and the front end portion of the output shaft 28.

The counter shaft 40 serves as a forward gear on the counter side, and is meshed with a first speed input gear 52 at a front end portion thereof.
A third speed counter gear 64 and a second speed counter gear 66 meshing with the second speed input gear 54 are rotatably provided, and a third speed counter gear 6 meshing with a third speed input gear 56 is provided at a central portion.
8th and 4th speed counter gear 70 meshing with 4th speed input gear 58
And are fixedly provided.

The counter shaft 40 between the first speed counter gear 64 and the second speed counter gear 66 has a first speed / second speed synchronizing mechanism 72.
The first and second speed hubs 74 are fixedly provided. The first / second speed synchronizing mechanism 72 is integrally provided with a first / second speed switching sleeve 76 and a reverse counter gear 78.

The reverse idler shaft 48 is provided with a reverse idler gear 80 capable of meshing with and disengaging from the reverse input gear 62 and the reverse counter gear 78.

The third speed input gear 56 and the fourth speed input gear 5
A third speed / fourth speed hub 84 of a third speed / fourth speed synchronizing mechanism 82 is fixedly provided on the input shaft 18 between the eight. This 3rd speed
The fourth speed synchronizing mechanism 82 is provided with a third speed / fourth speed switching sleeve 86.

In the transmission rear case 12, an interposer 88 is splined and fixed to the front end portion of the output shaft 28.
A fifth speed hub 92 of a fifth speed synchronization mechanism 90 is fixedly provided between the fifth speed direct coupling dock clutch 60 and the fifth speed hub 92. The 5-speed synchronizing mechanism 90 is provided with a 5-speed switching sleeve 94.

In the transmission rear case 12, the counter shaft 40 is formed with a reduction speed drive gear 98 of a reduction speed mechanism 96, which is a pair of reduction speed gears, on the outer peripheral surface thereof in order to obtain a reduction speed ratio. In order to obtain a high reduction ratio, a high reduction drive gear 102 of the high reduction mechanism 100, which is a pair of high reduction gears, is spline-coupled to the rear end portion.

Further, on the output shaft 28, a reduction speed driven gear 104 meshed with the reduction speed drive gear 98 and a high reduction driven gear 106 meshed with the high reduction drive gear 102.
Are rotatably provided.

A high reduction speed hub 110 of a high reduction speed switching mechanism (synchronization mechanism) 108, which is a switching mechanism of a high reduction speed ratio, is fixedly provided on the output shaft 28 between the reduction speed driven gear 104 and the high reduction driven gear 106. . The high reduction speed switching mechanism 110 is provided with a high reduction speed switching sleeve 112.

In the transfer front case 14 and the transfer rear case 16, the output shaft 28 has
Transfer drive sprockets 114 and 2 from the front
A wheel / four-wheel switching mechanism (synchronization mechanism) 116 is sequentially provided. The two-wheel / four-wheel switching mechanism 116 includes a two-wheel / four-wheel switching dock clutch 118 connected to the transfer drive sprocket 114 and two-wheel / four-wheel switching mechanism fixed to the output shaft 28.
4-wheel switching hub 120 and 2-wheel / 4-wheel switching sleeve 122
And

At the rear end portion of the output shaft 28, the rear propulsion shaft connecting member 12 is held by the extension case 124 of the transfer rear case 16 and is spline-coupled.
6 are provided.

Further, the transfer front case 14 and the transfer rear case 16 are provided with a transfer front shaft 128 which is arranged in parallel with the output shaft 28 and which is pivotally supported by a first front bearing 130 and a second front bearing 132. ing. This transfer front shaft 1
28, a transfer driven sprocket 134 is fixedly provided corresponding to the transfer drive sprocket 114 of the output shaft 28.

This transfer drive sprocket 1
A transfer chain 136 is wound around the 14 and the transfer driven sprocket 134.

Further, the transfer front shaft 128 is provided with a front propulsion shaft connecting member 138 held by the transfer front case 14 and spline-coupled.

Next, the operation of this embodiment will be described.

When the input shaft 18 and the output shaft 28 are directly connected to each other, if the 5-speed switching sleeve 94 is connected to the 5-speed direct connection dock clutch 60, the input shaft 18 and the output shaft 28 are integrated and the input shaft 18 and the output shaft 28 are integrated. The output shaft 28 rotates with the rotation of 28.

When it is desired to separate the input shaft 18 and the output shaft 28 to obtain a reduced speed ratio, if the high reduced speed switching sleeve 112 is connected to the reduced speed driven gear 104, the rotation of the counter shaft 40 causes the reduced speed. The output shaft 28 rotates via the drive gear 98, the reduction speed driven gear 104, and the high reduction speed hub 110, and the reduction speed ratio can be obtained.

On the other hand, when it is desired to separate the input shaft 18 and the output shaft 28 to obtain a high reduction ratio, if the high reduction speed switching sleeve 112 is connected to the high reduction driven gear 106, the rotation of the counter shaft 40 causes high reduction. The output shaft 28 rotates via the drive gear 102, the high reduction driven gear 106, and the high reduction speed hub 110, and a high reduction ratio can be obtained.

As a result, it is possible to obtain a reduced speed ratio without dividing the output shaft 28. Therefore, only one output shaft 28 is required, the number of parts is reduced, and the structure is simplified, and It can be cheap.

Further, since the reduction speed drive gear 98 of the reduction speed mechanism 96 is provided on the counter shaft 40, the reduction speed mechanism 96 may be a pair of gears, which makes it lightweight and compact and inexpensive. it can.

Further, the output shaft 28 has a front end portion which is the input shaft 1.
8 is supported at the rear end portion and the central portion is supported by the first and second output bearings 32 and 34, and
Since it is supported at 3 points, it reduces axial misalignment and shake,
As a result, it is possible to reduce the occurrence of gear noise and vibration, and also to increase the support rigidity and to cope with high torque input, and thus to achieve a wide engine torque range (engine displacement range). This power transmission device 2 can be mounted on a vehicle.

Further, in the present invention, as shown in FIG. 2, the high speed reduction mechanism 100 is arranged on the front side of the vehicle with respect to the reduction speed mechanism 96, and the reduction speed drive gear 140 of the reduction speed mechanism 96 is arranged on the counter shaft 40. Even when the two-wheel / four-wheel switching mechanism 116 is provided on the front side of the vehicle with respect to the transfer drive sprocket 114 by spline coupling with the reduced speed driven gear 104, the same operation as in the above-described embodiment is performed. The effect can be obtained.

[0034]

As is apparent from the above detailed description, according to the present invention, the input shaft for inputting the driving force from the engine is provided, the output shaft is provided on the same axis as the input shaft, and the input shaft and the output are provided. A counter shaft is provided in parallel with the shaft, a forward gear, a synchronous mechanism and a reverse gear are provided between the input shaft and the counter shaft, and a direct connection stage clutch is provided between the input shaft and the output shaft. By providing a pair of reduction speed gears having a reduction speed ratio and a pair of high reduction gears having a high reduction ratio between the shafts so as to be selectively coupled to the output shaft by a switching mechanism provided on the output shaft, Without dividing the output shaft, the reduction speed gear or the high reduction gear is selectively coupled to the output shaft to reduce the number of parts, simplify the configuration, and further reduce the axial misalignment and the shake. It reduces the generation of gear noise and vibration, and can be inexpensive.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a power transmission device.

FIG. 2 is a partial configuration diagram of another power transmission device.

FIG. 3 is a configuration diagram of a conventional power transmission device.

[Explanation of symbols]

 2 power transmission device 4 transmission 6 transfer 18 input shaft 28 output shaft 40 counter shaft 60 5th speed direct connection dock clutch 96 low reduction mechanism 100 high reduction mechanism 108 high / low speed switching mechanism 116 two-wheel / four-wheel switching mechanism

Claims (1)

[Claims] 1. An input shaft for inputting a driving force from an engine is provided, an output shaft is provided on the same axis as the input shaft, and a counter shaft is provided in parallel with the input shaft and the output shaft. A forward gear, a synchronizing mechanism and a reverse gear between the input shaft and the output shaft, a direct connection clutch between the input shaft and the output shaft, and the output shaft between the output shaft and the counter shaft. A transmission mechanism provided with a pair of reduction speed gears having a reduction speed ratio and a pair of high reduction gears having a high reduction ratio so as to be selectively coupled to the output shaft by a switching mechanism provided in .