JPH09188155A - Power transmission device - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to achieve commonization of components of a power transmission device for a two-wheel drive vehicle and a four-wheel drive vehicle. It can be easily changed to a power transmission device for driving vehicles and assembled, and it can improve the assemblability,
It is to improve maintainability such as disassembly and assembly, and to reduce costs. Therefore, according to the present invention, a main transmission unit connected to an engine and a two-wheel auxiliary transmission unit and a four-wheel auxiliary transmission unit that are selectively coupled to the main transmission unit are provided. The main shifting clutch portion of the main shifting input shaft and the main shifting coupling portion of the main shifting counter shaft, the two-wheel clutch portion of the two-wheel output shaft of the two-wheel shifting portion, and the two-wheel counter shaft of One of the two-wheel coupling section, the four-wheel clutch section of the four-wheel output shaft of the four-wheel transmission section, and the four-wheel coupling section of the four-wheel counter shaft is coupled and provided. Characterize.

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, it can achieve commonalization of components of the power transmission device for two-wheel drive vehicles and four-wheel drive vehicles. And 4
A power transmission device that can be easily changed to a power transmission device for a wheel drive vehicle and can be assembled to improve assembly performance, maintainability such as disassembly and assembly can be improved, and cost can be reduced. Regarding

[0002]

2. Description of the Related Art In a vehicle, a power transmission device is provided in order to convert a driving force of an engine mounted on the vehicle to a wheel according to a driving condition.

A power transmission device for a four-wheel drive vehicle is shown in FIG. In FIG. 3, 202 is a main transmission unit connected to an engine (not shown), and 204 is a four-wheel auxiliary transmission unit 204 coupled to this main transmission unit 202.

The main transmission unit 202 is a main transmission unit case 2
At 06, a main shift input shaft 208 to which the driving force from the engine is input and a main shift counter shaft 210 parallel to the main shift input shaft 208 are axially supported. An input side end of the main transmission input shaft 208, which is projected and extended toward the engine side, is connected to the engine via a clutch 212. Four-wheel auxiliary transmission unit 20 of main transmission counter shaft 210
The output side end, which is extended and extended to the four side, is provided so as to be axially supported by a four-wheel auxiliary transmission unit case 248 described later.

Between the main-gear input shaft 208 and the main-gear counter shaft 210, the first-gear to fourth-gear input gears 214 to 220 and the first-gear to fourth-gear counter gears 2 constituting the forward gear train are provided.
22 to 228, a reverse input gear 230, a reverse counter gear 232, and a reverse idler gear 234 that form a reverse gear train.

Further, the first and second speed counter gears 222.2
The main shift counter shaft 210 between 245 has a synchronous first-speed / second-speed switching mechanism 236 which is a switching mechanism for the forward gear train.
Is provided. The main transmission input shaft 208 between the third and fourth speed input gears 218 and 220 is provided with a synchronous third and fourth speed switching mechanism 238 that is a forward speed gear train switching mechanism.

Auxiliary transmission section 2 for four wheels of the input shaft 208 for main transmission
The output side end protruding to the 04 side is provided with a main shift clutch portion 242 which constitutes a direct coupling clutch mechanism 240 for the fifth speed. Auxiliary transmission section 2 for four wheels of unta shaft 210 for main transmission
On the output side, a reduction speed counter gear 244 forming a low final reduction gear train having a low reduction ratio and a high reduction counter gear 24 forming a high final reduction gear train having a high reduction ratio are provided on the output side.
6 is provided.

The four-wheel auxiliary transmission section 204 is provided by connecting the four-wheel auxiliary transmission section case 248 to the main transmission section case 206. The four-wheel auxiliary transmission unit 204 includes a four-wheel auxiliary transmission unit case 248, a four-wheel output shaft 250 that outputs a driving force to a rear propulsion shaft (not shown), and the four-wheel output shaft 250.
And a transfer output shaft 252 that outputs a driving force to a front-side propulsion shaft (not shown) in parallel with.

The input side end of the four-wheel output shaft 250, which is extended toward the main transmission portion 202 side, is axially supported by the output side end of the main transmission input shaft 208. At the input side end of the four-wheel output shaft 250, 5
A four-wheel clutch portion 254 that constitutes the direct clutch mechanism 240 for speed is provided.

The four-wheel output shaft 250 meshes with the reduction speed output gear 256 and the high reduction counter gear 246 which mesh with the reduction speed counter gear 244 to form a low final reduction gear train having a reduction speed ratio. A high reduction output gear 258 that constitutes a high final reduction gear train with a high reduction ratio is provided, and a high reduction speed ratio switching mechanism 260 is provided between the reduction speed output gear 256 and the high reduction output gear 258.

A transfer drive sprocket 262 and a transfer driven sprocket 264 are provided between the four-wheel output shaft 250 and the transfer output shaft 252.
And the transfer chain 266, and the four-wheel output shaft 2 adjacent to the transfer drive sprocket 262.
The 50 is provided with a two-wheel / four-wheel switching mechanism 268. An output side end of the four-wheel output shaft 250 is connected to a rear propelling shaft (not shown). An output side end of the transfer output shaft 252 is connected to a front propulsion shaft (not shown).

An example of such a power transmission device for a four-wheel drive vehicle is disclosed in Japanese Patent Application Laid-Open No. 2-300545. The power transmission device disclosed in this publication divides an output shaft for four wheels provided coaxially with the input shaft into a first output shaft for four wheels and a second output shaft for four wheels, and an output side end of the input shaft. And a first direct-coupling switching mechanism for switching the input shaft and the first output shaft for four-wheels between a direct connection stage and a non-direct-coupling stage between the input side ends of the four-wheel first output shaft. A final reduction gear train is provided between the input side of the vehicle first output shaft, and a high-low speed gear train is provided between the extension of the counter shaft and the four-wheel second output shaft.
The first output shaft for four wheels and the second output shaft for four wheels are switched between a direct connection stage and a non-direct connection stage between the output side end of the first output shaft for wheels and the input side end of the second output shaft for four wheels, Further, a high-low speed switching mechanism is provided for switching the high-low speed gear train to a non-meshing state when switching to the direct connection stage and switching the high-low speed gear train to a meshing state when switching to the non-direct-coupling stage.

[0013]

By the way, in the conventional power transmission device shown in FIG. 3, the main transmission portion 202 and the four-wheel auxiliary transmission portion 204 are provided, and the main transmission portion case 206 and the four-wheel portion are provided, respectively. It is assembled with the auxiliary transmission case 248 for a four-wheel drive vehicle.

However, in the conventional power transmission device, the main transmission counter shaft 210 is extended to the side of the four-wheel sub-transmission portion 204 so as to extend between the main transmission portion case 206 and the four-wheel sub transmission portion case 248. It is provided to support.

For this reason, in the conventional power transmission device, the four-wheel auxiliary transmission unit 204 is removed from the main transmission unit 202, and the two-wheel auxiliary transmission unit (not shown) is connected to the main transmission unit 202. Even if an attempt is made to assemble it for a wheel drive vehicle, the main shift counter shaft 2
Since components such as 10 cannot be shared, the ratio of commonization is low, which is disadvantageous in assembly and production.

[0016]

Therefore, in order to eliminate the above-mentioned inconveniences, the present invention is directed to a main transmission portion connected to an engine and a two-wheel auxiliary transmission portion selectively coupled to the main transmission portion. And a sub-transmission unit for four wheels, the main transmission unit is provided in the main transmission unit case by pivotally supporting a main transmission input shaft and a main transmission counter shaft parallel to the main transmission input shaft. The main speed change input shaft is provided with a main speed change clutch portion forming a direct coupling clutch mechanism at the output side end thereof, and the main speed change counter shaft is provided with a main speed change coupling portion at the output side end thereof. Is provided in the auxiliary transmission section case for two wheels by pivotally supporting an output shaft for two wheels and a counter shaft for two wheels parallel to the output shaft for two wheels.
An input side end of the two-wheel output shaft is provided with a two-wheel clutch part that constitutes the direct coupling clutch mechanism, and a two-wheel coupling part is provided at the input-side end of the two-wheel counter shaft. The transmission part is provided in the auxiliary transmission part case for four wheels by axially supporting an output shaft for four wheels and a counter shaft for four wheels and an output shaft for transfer parallel to the output shaft for four wheels. Is provided with a four-wheel clutch portion that constitutes the direct coupling clutch mechanism at the input side end thereof, and a four-wheel coupling portion is provided at the input side end of the four-wheel counter shaft, and the main shift clutch of the main shift input shaft is provided. Section and main shift coupling portion of the main shift counter shaft, a two-wheel clutch portion of the two-wheel output shaft, a two-wheel clutch portion of the two-wheel counter shaft, and a four-wheel clutch of the four-wheel output shaft. Section and the four-wheel counter shaft four-wheel coupling section are connected and installed. Characterized in that was.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The power transmission device of the present invention is provided with a main transmission portion, a two-wheel auxiliary transmission portion and a four-wheel auxiliary transmission portion which are selectively coupled to the main transmission portion, and the main transmission portion is provided. Of the main transmission input shaft, the main transmission clutch portion constituting the direct coupling clutch mechanism is provided at the output side end, and the main transmission coupling portion is provided at the output side end of the main transmission counter shaft. The two-wheel output shaft has an input-side end provided with a two-wheel clutch that cooperates with the main-transmission clutch to form a direct coupling clutch mechanism, and the two-wheel counter shaft has an input-side end provided with a main-transmission coupling portion. A four-wheel clutch unit that forms a direct-coupling clutch mechanism is provided at the input side end of the four-wheel output shaft of the four-wheel sub-transmission unit, which is provided with a two-wheel coupling unit to be coupled. For four wheels provided and coupled to the main speed change coupling portion at the input side end of the four-wheel counter shaft The engaging portion is provided.

As a result, in this power transmission device, the main shift clutch portion of the main shift input shaft and the main shift coupling portion of the main shift counter shaft are connected to the two-wheel clutch portion of the two-wheel output shaft and the two-wheel clutch portion. A two-wheel drive vehicle can be obtained by connecting the two-wheel coupling portion of the wheel counter shaft, while the main shifting clutch portion of the main shifting input shaft and the main shifting coupling of the main shifting counter shaft are connected. By connecting the four-wheel clutch portion of the four-wheel output shaft and the four-wheel coupling portion of the four-wheel counter shaft to the portion, a four-wheel drive vehicle can be obtained.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of a power transmission device according to the present invention. In FIG. 1 and FIG. 2, 2 is a main transmission unit connected to an engine (not shown), and 4 and 6 are sub-transmission units for two wheels and sub-transmission units for four wheels that are selectively coupled to the main transmission unit 2, respectively. It is a speed change unit.

The main transmission unit 2 is a main transmission unit case, and a main transmission unit first case 8 and a main transmission unit second case 10 are provided.
Is provided. The main transmission unit 2 includes a first wall portion 12 of a main transmission portion first case 8 and a second wall portion 1 of a main transmission portion second case 10.
4, a main transmission input shaft 16 to which a driving force from the engine is input is provided by being axially supported by an input shaft first bearing 18 and an input shaft second bearing 20.

Further, the main transmission unit 2 is provided on the first wall unit 12 of the main transmission unit first case 8 and the second wall unit 14 of the main transmission unit second case 10 in parallel with the main transmission input shaft 16. The gear shift counter shaft 22 is supported by a counter shaft first bearing 24 and a counter shaft second bearing 26.

A clutch 28 is provided at an input side end of the main transmission input shaft 16 which extends from the first wall portion 14 toward the engine side.
Is provided. The main gearshift input shaft 16 is connected to the engine via a clutch 28.

The first speed input gear 30 and the second speed input gear 32 forming the forward gear train are fixedly provided on the main speed-change input shaft 16, and the third speed input gear 34 and the fourth speed input gear 36 are provided. Is provided on the shaft support. The main shift counter shaft 22 is provided with a first speed counter gear 38 and a second speed counter gear 40, which form forward gears by meshing with the first speed to fourth speed input gears 30 to 36, respectively. The third speed counter gear 42 and the fourth speed counter gear 44 are fixedly provided.

The main shift counter shaft 22 between the first and second speed counter gears 38 and 40 is provided with a synchronous first and second speed switching mechanism 46 which is a switching mechanism for the forward gear train. 1
The first / second speed switching mechanism 46 includes a first / second speed hub 48 fixed to the main shift counter shaft 22 and a first / second speed counter gear 3.
First / second speed switching sleeve 5 that is engaged / disengaged with 8/40
0 is provided so as to be movable in the axial direction and non-rotatable.

The main transmission input shaft 16 between the third and fourth speed input gears 34 and 36 is provided with a synchronous third and fourth speed switching mechanism 52 which is a switching mechanism for the forward gear train. The 3rd speed / 4th speed switching mechanism 52 is a 3rd speed /
Engages the 4th speed hub 54 with the 3rd and 4th speed input gears 34 and 36.
A detachable third-speed / fourth-speed switching sleeve 56 is provided so as to be axially movable and non-rotatable.

A reverse input gear 58 constituting a reverse gear train is provided on the main transmission input shaft 16 between the first and second speed input gears 30 and 32. First and second speed counter gear 38
A reverse counter gear 60 that constitutes a reverse gear train is integrally provided on the first-speed / second-speed switching sleeve 50 of the first-speed / second-speed switching mechanism 46 provided on the main shift counter shaft 22 between 40 gears. There is.

The reverse input gear 58 and the reverse counter gear 60 mesh with a reverse idler gear 62.
Will be withdrawn. The reverse idler gear 62 is axially movably supported by a reverse idler shaft 64 supported by the main transmission section first case 8 and the main transmission section second case 10.

A shaft-shaped main gear shift shaft support portion 66 is provided at the output side end of the main gear shift input shaft 16 protruding from the second wall portion 14 to form a synchronous direct coupling clutch mechanism 68 for the fifth speed. There is provided a main shifting clutch portion 70 including a dock.
A shaft-shaped main speed change coupling portion 72 is provided at the output side end of the main speed change counter shaft 22 protruding from the second wall portion 14.

On the output end side of the second main transmission case 10, a main transmission joint surface 74 and a main transmission screw hole 76 are provided.

As shown in FIG. 1, the two-wheel auxiliary transmission section 4 includes a two-wheel auxiliary transmission section case 78 having a wall portion 80 in which a two-wheel output shaft 82 is provided in the middle thereof. 2 bearings 84/86
The counter shaft 88 for two wheels, which is parallel to the output shaft 82 for two wheels, is provided on the wall portion 80 by the counter shaft bearing 90 for two wheels.

A final reduction output gear 92 forming a final reduction gear train is fixedly provided on the two-wheel output shaft 82. The two-wheel counter shaft 88 is fixedly provided with a final reduction counter gear 94 that meshes with the final reduction output gear 92 to form a final reduction gear train.

A hole-shaped two-wheel support portion 96 is provided at the input side end of the two-wheel output shaft 82, and cooperates with the main gear shift clutch portion 70 of the main gear shift input shaft 16 to directly connect the clutch mechanism. 68
Is provided with a two-wheel clutch portion 98. The two-wheel support portion 96 is externally mounted on the main-transmission shaft support portion 66 of the main-transmission input shaft 16 and is axially supported by the bearing 100. In the two-wheel clutch portion 98, a direct coupling hub 104 fixed to the two-wheel output shaft 80 is provided with a direct coupling sleeve 104 which is axially movable and non-rotatable. The direct coupling sleeve 104 is engaged / disengaged with the main shift clutch portion 70.

At the input side end of the two-wheel counter shaft 88, a hole-shaped two-wheel coupling portion 106 is provided. Two-wheel joint 1
06 is mounted on the main speed change connecting portion 72 and is connected by a spline.

At the output side end of the two-wheel output shaft 80, a propulsion shaft connecting member 108 connected to a propulsion shaft (not shown) is provided by being held in the extension portion 110 of the two-wheel transmission section case 78. There is.

A two-wheel joining surface 112 having a shape matching the main-gear joining surface 74 is provided on the input end side of the two-wheel sub-giving section case 78 so as to match the main-gear screw hole 76. Thus, the two-wheel bolt hole 114 is provided. A mounting bolt 116 is inserted into the two-wheel bolt hole 114 and screwed into the main shift screw hole 76.

As shown in FIG. 2, the four-wheel sub-transmission unit 6 serves as a four-wheel sub-transmission unit case, and the four-wheel sub-transmission unit first.
A case 118 and a second case 120 for the four-wheel auxiliary transmission unit are provided.

The four-wheel auxiliary transmission unit 6 is a four-wheel auxiliary transmission unit first.
The first wall portion 122 of the case 118 and the second sub-transmission portion for four wheels
The middle of the four-wheel output shaft 126 is pivotally supported by the four-wheel output shaft first and second bearings 128 and 130 on the second wall portion 124 of the case 120, and four wheels are parallel to the four-wheel output shaft 126. The output side end of the counter shaft 132 is provided on the first wall 122 by a four-wheel counter shaft bearing 134.

In the four-wheel auxiliary transmission section 6, the transfer output shaft 136 parallel to the four-wheel output shaft 126 is provided on the first wall portion 122 and the second wall portion 124.
The shaft is supported by the second bearings 138 and 140.

On the input side of the four-wheel output shaft 126, a reduction speed output gear 142 which constitutes a low final reduction gear train having a low reduction ratio is pivotally supported and a high final reduction gear train having a high reduction ratio is formed. A high speed reduction output gear 144 is provided to be axially supported. The four-wheel counter shaft 132 has a reduction speed counter gear 146 that meshes with the reduction speed output gear 142 to form a low final reduction gear train.
Is fixedly provided, and a high reduction counter gear 148 that meshes with the high reduction output gear 144 to form a high final reduction gear train is fixedly provided.

A high reduction speed ratio switching mechanism 150 is provided on the four-wheel output shaft 126 between the reduction speed output gear 142 and the high reduction output gear 144. High reduction speed ratio switching mechanism 150
Shows a reduction speed output gear 142 and a high reduction output gear 14 in a high reduction speed ratio switching hub 152 fixed to the four-wheel output shaft 126.
A reduction ratio switching sleeve 154 that is engaged / disengaged with the gear No. 4 is provided so as to be axially movable and non-rotatable.

A transfer drive sprocket 156 is axially supported in the middle of the four-wheel output shaft 126. A transfer driven sprocket 158 is fixedly provided on the transfer output shaft 136. A transfer chain 160 is wound around the transfer drive sprocket 156 and the transfer driven sprocket 158.

Transfer drive sprocket 1
The four-wheel output shaft 126 adjacent to 56 is provided with a synchronous two-wheel / four-wheel switching mechanism 162. The two-wheel / four-wheel switching mechanism 162 includes a two-wheel / four-wheel switching hub 164 fixed to the four-wheel output shaft 126 and a two-wheel / four-wheel switching sleeve 166 provided axially movable and non-rotatable. Two-wheel / four-wheel switching sleeve 166 on the sprocket 156.
Drivance sprocket dock 16 for engaging and disengaging
8 are provided.

At the input side end of the four-wheel output shaft 126, a hole-shaped four-wheel support portion 170 is provided, and the main transmission input shaft 16 is provided.
The four-wheel clutch portion 172 that forms the direct coupling clutch mechanism 68 in cooperation with the main shift clutch portion 70 is provided.
The four-wheel support portion 170 is mounted on the main-gearing shaft support portion 66 of the main-gearing input shaft 16 and is supported by a bearing 174.
In the four-wheel clutch portion 172, a direct coupling hub 176 fixed to the four-wheel output shaft 126 is provided with a direct coupling sleeve 178 which is axially movable and non-rotatable. Direct connection sleeve 178
Is engaged / disengaged with the main shift clutch portion 70.

At the input end of the four-wheel counter shaft 132,
A hole-shaped four-wheel coupling portion 180 is provided. The four-wheel coupling portion 180 is mounted on the main gear shifting coupling portion 72 and is coupled by a spline.

A rear propulsion shaft connecting member 1 connected to a rear propulsion shaft (not shown) is provided at an output side end of the four-wheel output shaft 126.
82 is held by the extension portion 184 of the four-wheel transmission portion second case 120. At the output side end of the transfer output shaft 136, a front propulsion shaft connecting member 186 connected to a front propulsion shaft (not shown) is provided with a four-wheel transmission section first case 118.
It is provided so as to be held by the extension portion 188 of the.

A four-wheel joining surface 190 having a shape matching the main-gear joining surface 74 is provided on the input end side of the four-wheel sub-giving section first case 116, and the main-gear screw hole 76 is provided.
The four-wheel bolt holes 192 are provided so as to coincide with the above. The mounting bolts 116 are inserted through the four-wheel bolt holes 192,
It is screwed into the main shift screw hole 76.

Next, the operation of this embodiment will be described.

In the case of a power transmission device for a two-wheel drive vehicle, a two-wheel auxiliary transmission unit 4 is connected to the main transmission unit 2.

The main transmission shaft support 66 of the main transmission input shaft 16 of the main transmission unit 2 is covered with the two-wheel support portion 96 of the two-wheel output shaft 82 of the two-wheel auxiliary transmission unit 4, and the bearing 100 is used. Pivot,
The main clutch unit 70 of the main transmission input shaft 16 of the main transmission unit 2 is connected to the two-wheel clutch unit 98 of the two-wheel output shaft 82 of the two-wheel auxiliary transmission unit 4 to form the direct coupling clutch mechanism 68. To do.

The main shift counter shaft 2 of the main shift unit 2
The two main gear shifting coupling portions 72 are fitted with the two-wheel coupling portion 106 of the two-wheel counter shaft 88 of the two-wheel sub-transmission portion 4 and are coupled by splines.

Then, the two-wheel joint surface 112 of the two-wheel sub-transmission portion case 78 is brought into contact with the main-transmission joint surface 74 of the main-transmission portion second case 10, and the main-transmission portion of the main-transmission portion second case 10 is shifted. The two-wheel bolt hole 114 of the two-wheel auxiliary transmission portion case 78 is aligned with the two-wheel bolt hole 76, the mounting bolt 116 is inserted into the two-wheel bolt hole 114, and the main-speed screw hole 76 is screwed and tightened. .

Thus, the two-wheel sub-transmission unit 4 is coupled to the main transmission unit 2 to be assembled into a power transmission device for a two-wheel drive vehicle.

On the other hand, in the case of a power transmission device for a four-wheel drive vehicle, a four-wheel auxiliary transmission unit 6 is connected to the main transmission unit 2.

The main transmission shaft support 66 of the main transmission input shaft 16 of the main transmission 2 is connected to the four-wheel output shaft 126 of the four-wheel auxiliary transmission 6.
The four-wheel support portion 170 is externally mounted and is axially supported by a bearing 174, and the main-shift clutch portion 70 of the main-shift input shaft 16 of the main shift portion 2 has a four-wheel output shaft 126 of the four-wheel shift portion 6. The four-wheel clutch portion 172 is coupled to form the direct coupling clutch mechanism 68.

The main shift counter shaft 2 of the main shift unit 2
The second main gear shifting coupling portion 72 is fitted with the four-wheel coupling portion 180 of the four-wheel counter shaft 132 of the four-wheel shifting portion 6 and is coupled by a spline.

Then, the main transmission joint surface 74 of the main transmission portion second case 10 is brought into contact with the four-wheel joint surface 190 of the four-wheel auxiliary transmission portion first case 118, and the main transmission portion second case 10 is contacted. The sub-transmission portion first case 118 for four wheels is provided in the screw hole 76 for main transmission.
Align the four-wheel bolt holes 192 of the four-wheel bolt holes 1
Inserting the mounting bolt 116 into 92, screw hole 76 for main transmission
Screw on and tighten.

As a result, the four-wheel sub-transmission unit 6 is coupled to the main transmission unit 2 and assembled into a power transmission device for a four-wheel drive vehicle.

As described above, the power transmission device is provided with the main transmission unit 2, the two-wheel auxiliary transmission unit 4 and the four-wheel auxiliary transmission unit 6 which are selectively coupled to the main transmission unit 2. A main shift clutch portion 70 constituting a direct coupling clutch mechanism 68 is provided at the output side end of the main shift input shaft 16 of the main shift portion 2, and a main shift coupling portion 7 is provided at the output side end of the main shift counter shaft 22.
2 is provided, and at the input end of the two-wheel output shaft 82 of the two-wheel sub-transmission section 4, a two-wheel clutch section 98 that cooperates with the main shift clutch section 70 to form the direct coupling clutch mechanism 68 is provided. The input side end of the two-wheel counter shaft 88 is provided with the two-wheel coupling section 106 coupled to the main-speed shifting coupling section 72, and the four-wheel sub-transmission section 6 is provided with a four-wheel output shaft 126 at the input side end. A four-wheel clutch portion 172 that forms a direct coupling clutch mechanism 68 in cooperation with the shift clutch portion 70 is provided, and the four-wheel counter shaft 132 is coupled to the main shift coupling portion 72 at the input side end thereof. A connecting portion 180 is provided.

As a result, the power transmission device is configured such that the main gearshift clutch portion 70 of the main gearshift input shaft 16 and the main gearshift coupling portion 72 of the main gearshift counter shaft 22 are connected to the two-wheel output shaft 82.
2 of the two-wheel clutch portion 98 and the two-wheel counter shaft 88
By coupling the wheel coupling portion 106, it can be used for a two-wheel drive vehicle, while the main gear shifting clutch portion 70 of the main gear shifting input shaft 16 and the main gear shifting coupling portion 72 of the main gear shifting counter shaft 22. In addition, a four-wheel clutch portion 172 of the four-wheel output shaft 126 and a four-wheel coupling portion 18 of the four-wheel counter shaft 132.
By combining 0, it can be used for a four-wheel drive vehicle.

Therefore, in this power transmission device, the main transmission portion 2 can be used for both the two-wheel drive vehicle and the four-wheel drive vehicle, and the constituent parts of the power transmission device can be shared. Further, the dust power transmission device is configured so that by selecting and assembling the two-wheel sub-transmission unit 4 and the four-wheel sub-transmission unit 6 to the main transmission unit 2, the power of the two-wheel drive vehicle and that of the four-wheel drive vehicle are selected. The transmission device can be easily changed and assembled, the assembling property can be improved, the maintainability such as disassembly and assembly can be improved, and the cost can be reduced.

[0061]

As described above, the power transmission device of the present invention is provided with the main transmission portion and the two-wheel auxiliary transmission portion and the four-wheel auxiliary transmission portion that are selectively coupled to the main transmission portion. The main shift clutch section of the main shift input shaft of the shift section and the main shift coupling section of the main shift counter shaft, the two-wheel clutch section of the two-wheel output shaft of the two-wheel shift section, and the two-wheel counter By connecting the two-wheel coupling portion of the shaft, it can be used for a two-wheel drive vehicle, while the main shifting clutch portion of the main shifting input shaft of the main shifting portion and the main shifting counter shaft of the main shifting portion are used. By connecting the four-wheel clutch portion of the four-wheel output shaft of the four-wheel transmission unit and the four-wheel coupling portion of the four-wheel counter shaft to the joint portion, the four-wheel drive vehicle can be realized.

For this reason, in this power transmission device, the main transmission portion can be shared by the two-wheel drive vehicle and the four-wheel drive vehicle, and the constituent parts of the power transmission device can be shared, and the two-wheel drive vehicle can be achieved. Can be easily changed to a power transmission device for automobiles and four-wheel drive vehicles and can be assembled, which can improve the assemblability, which can improve the maintainability such as disassembly and assembly, and can reduce the cost. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a power transmission device for a two-wheel drive vehicle showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a power transmission device for a four-wheel drive vehicle.

FIG. 3 is a sectional view of a conventional power transmission device for a four-wheel drive vehicle.

[Explanation of symbols]

 2 Main transmission section 4 Two-wheel auxiliary transmission section 6 Four-wheel auxiliary transmission section 16 Main transmission input shaft 22 Main transmission counter shaft 68 Direct coupling clutch mechanism 70 Main transmission clutch section 72 Main transmission coupling section 82 Two-wheel coupling Output shaft 88 Two-wheel counter shaft 98 Two-wheel clutch unit 106 Two-wheel coupling unit 126 Four-wheel output shaft 132 Four-wheel counter shaft 136 Transfer output shaft 172 Four-wheel clutch unit 180 Four-wheel coupling unit

Claims (2)

[Claims] 1. A main transmission unit connected to an engine, and a two-wheel auxiliary transmission unit and a four-wheel auxiliary transmission unit selectively coupled to the main transmission unit, the main transmission unit being the main transmission unit. A main shift input shaft and a main shift counter shaft parallel to the main shift input shaft are pivotally supported on the case, and the main shift input shaft has a direct coupling clutch mechanism at the output side end thereof. A clutch portion is provided and a main transmission coupling portion is provided at the output side end of the main transmission counter shaft. The two-wheel auxiliary transmission portion is a two-wheel auxiliary transmission portion case and the two-wheel output shaft and the two-wheel auxiliary shaft portion. A two-wheel counter shaft parallel to the output shaft is axially supported, and a two-wheel clutch portion forming the direct coupling clutch mechanism is provided at the input side end of the two-wheel output shaft and the two-wheel counter shaft. A two-wheel coupling portion is provided at the input side end of the
A four-wheel output shaft, a four-wheel counter shaft parallel to the four-wheel output shaft, and a transfer output shaft are provided on the auxiliary wheel transmission case, and the input side end of the four-wheel output shaft is provided. Is provided with a four-wheel clutch portion that constitutes the direct coupling clutch mechanism, and a four-wheel coupling portion is provided at the input side end of the four-wheel counter shaft, and the main gear shift clutch portion and the main gear shift of the main gear shift input shaft are provided. For a main transmission of a counter shaft for a vehicle, a two-wheel clutch for the two-wheel output shaft, a two-wheel clutch for a two-wheel counter shaft, and a four-wheel clutch for the four-wheel output shaft and four wheels. A power transmission device, characterized in that either one of the four-wheel coupling portion of the vehicle counter shaft is coupled and provided. 2. A main transmission unit connected to an engine, and a two-wheel auxiliary transmission unit and a four-wheel auxiliary transmission unit selectively coupled to the main transmission unit, the main transmission unit being the main transmission unit. The case is provided with a main shift input shaft and a main shift counter shaft parallel to the main shift input shaft so as to support the forward shift gear train and the reverse gear between the main shift input shaft and the main shift counter shaft. And a main gear shift input mechanism, a main gear shift input shaft and a main shift counter shaft are provided with a forward gear shift train switching mechanism, and a direct coupling clutch mechanism is provided at an output side end of the main shift input shaft. And a main gearshift coupling portion is provided at the output side end of the main gearshift counter shaft, and the two-wheel subtransmission portion is a two-wheel subtransmission portion case and the two-wheel output shaft and the two wheels. And a counter shaft for two wheels parallel to the output shaft for
A final reduction gear train is provided between the two-wheel output shaft and the two-wheel counter shaft, and an input side end of the two-wheel output shaft cooperates with the main shift clutch portion to form the direct coupling clutch mechanism. A two-wheel clutch portion is provided and a two-wheel coupling portion coupled to the main shifting coupling portion is provided at the input side end of the two-wheel counter shaft, and the four-wheel auxiliary shifting portion is a four-wheel sub-shifting portion. A four-wheel output shaft, a four-wheel counter shaft parallel to the four-wheel output shaft, and a transfer output shaft are provided on the partial case so as to be supported between the four-wheel output shaft and the four-wheel counter shaft. A low final reduction gear train having a low reduction ratio and a high final reduction gear train having a high reduction ratio are provided, and the low final reduction gear train and the high final reduction gear are provided on either one of the four-wheel output shaft and the four-wheel counter shaft. A row switching mechanism is provided to allow the transfer between the four-wheel output shaft and the transfer output shaft. A two-wheel / four-wheel switching mechanism is provided on one of the four-wheel output shaft and the transfer output shaft, and a main sprocket clutch is provided at the input side end of the four-wheel output shaft. 4 to form the direct coupling clutch mechanism in cooperation with
A wheel clutch portion is provided, and a four-wheel coupling portion that is coupled to the main gear shifting coupling portion is provided at an input side end of the four-wheel counter shaft, and a main gear shifting clutch portion and a main gear shifting input shaft of the main gear shifting input shaft are provided. A two-wheel clutch portion of the two-wheel output shaft, a two-wheel clutch portion of the two-wheel counter shaft, and a four-wheel clutch portion of the four-wheel output shaft and four in the main shift coupling portion of the shift counter shaft.
A power transmission device, characterized in that either one of a four-wheel coupling portion of a wheel counter shaft and a four-wheel coupling portion are coupled to each other.