JPH03284426A - Power transmission of four-wheel drive car - Google Patents

Abstract

PURPOSE:To facilitate the exchange of intermediate gear lines of different number of tooth by providing first and second intermediate gear lines on a position in the side of a side case of a main shaft of a transmission, of an intermediate shaft that communicates either to a front or rear wheel, as well as of an input shaft of a driving force distribution device that communicates to the other, in such a way that the gear line may be attached to or detached from the side case positions. CONSTITUTION:In a power transmission 4 that transmits the driving force from a transmission 6 to front and rear wheels, a main shaft 20 of the transmission 6, an intermediate shaft 24 that communicates either to front or rear wheel, and an input shaft 46 of a driving force distribution device 8 that communicates to the other, are provided on a main case part 10-1 as well as on a side case part 10-2, respectively, in such a way that they are journalled thereto. First and second intermediate gear lines 76, 78 that communicate to the main shaft 20, the intermediate shaft 24, and the input shaft 46, are provided freely attachable/detachable. The first intermediate gear line 76 is composed of an intermediate driving gear 80 and of an intermediate driven gear 82, and each gear 80, 82 is provided on the main shaft 20 as well as on the intermediate shaft 24 by spline and the like, freely attachable/detachable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power transmission device for a four-wheel drive vehicle, and more particularly to a power transmission device for a four-wheel drive vehicle that can easily change the gear ratio.

[Conventional technology]

In a four-wheel drive vehicle that drives both front and rear wheels, one of the front and rear wheels is driven by the driving force taken out from a transmission, and the driving force taken out from the transmission is distributed by a driving force distribution device. Some vehicles are equipped with a power transmission device that drives either the front or rear wheels. As a power transmission device for such four-wheel drive vehicles,
There are disclosures in Japanese Patent Publication No. 43884, Japanese Patent Publication No. 5294/1983, Japanese Patent Publication No. 35444/1983, Japanese Utility Model Application Publication No. 84725/1988, and the like.

The power transmission device disclosed in Japanese Patent Publication No. 62-43884 is provided with a differential that transmits driving force to either the front or rear wheels, and distributes the driving force to the other of the front or rear wheels via this differential. A clutch mechanism for switching between two-wheel drive and four-wheel drive is provided between the differential and the drive force distributor.

Further, the power transmission device disclosed in Japanese Patent Publication No. 63-5294 is provided with a front and rear wheel differential that allows the driving force taken out from the transmission to operate between the front and rear wheels. One side differential connected to the front and rear wheels drives one of the front and rear wheels, and the other side differential connected to the other side of the front and rear wheel differential drives the other one of the front and rear wheels.

Furthermore, the power transmission device disclosed in Japanese Patent Publication No. 63-35444 provides a common output shaft for the main transmission gear train and the auxiliary transmission gear train of the transmission having the main transmission gear train and the auxiliary transmission gear train. Idle shafts that pivotally support the idle gears of the auxiliary transmission gear train are provided in parallel, the ends of the output shaft and the idle shaft on the internal combustion engine side are each pivotally supported outside the clutch case wall on the internal combustion engine side, and the idle shaft is A clutch release arm is provided in the space within the wall of the clutch case where it is pivotally supported.

Furthermore, the power transmission device disclosed in Japanese Utility Model Application Publication No. 60-84725 is provided with a differential connected to the transmission via a final reduction gear train, and a driving force distributor connected to the differential. , the differential and the driving force distributor are connected by a gear train different from the final reduction gear train.

The power transmission system for conventional four-wheel drive vehicles is as follows:
For example, there is one shown in FIG. In the figure, 102
104 is an internal combustion engine, 104 is a power transmission device, 106 is a transmission,
108 is a driving force distributor. The power transmission device 104 is
A transmission case 110 and a distributor case 112 attached to the transmission case 110 are provided.

In the transmission case 110, for example, a torque converter 114 and an auxiliary transmission mechanism 116, which constitute the transmission 106, are arranged. An idler gear 120 is meshed with the output gear 118 of the transmission 106, and a final reduction driven gear 124 is meshed with a final reduction drive gear 122 integrated with the idler gear 120. is fixed to a differential housing 128 of a differential 126 connected to either the front or rear wheels. This differential 12
6 is provided with a differential gear train 130 within the differential housing 128.

Further, inside the distributor case 112, a driving force distributor 1 is provided.
An input gear 132 and an output gear 134 constituting 08 are disposed. The input gear 132 and the output gear 134 are provided at one end of the input shaft 136 and the output shaft 138, respectively, and are meshed with each other. A driven gear 14 that meshes with the final reduction driven gear 124 is provided on the other end side of the input shaft 136.
0 is set. Further, on the other end side of the output shaft 138, a propulsion shaft (not shown) is connected to the other of the front and rear wheels.
A joint 142 is provided to connect the two.

As a result, the power transmission device 104 automatically converts and extracts the driving force of the internal combustion engine 102 according to the operating state using the torque converter 114 of the transmission 106 and the auxiliary transmission mechanism 116, and outputs the driving force to the front and rear wheels via the differential 126. drive either one. Further, the driving force taken out from the transmission 106 is distributed to the input gear 132 and output gear 134 of the driving force distributor 108 via the driven gear 140, and is transmitted from a propulsion shaft (not shown) to either the front or rear wheels via a differential. to drive.

[Problems to be Solved by the Invention] By the way, when changing the gear ratio of the conventional four-wheel drive vehicle power transmission device 104 shown in FIG. The gear 122, the driven gear 140 meshing with the final reduction drive gear 122 via the final reduction driven gear 124, and the differential gear train 130 of the differential 126 connected to either the front or rear wheels are replaced. The input gear 132 and the output gear 134 of the driving force distributor 108 are connected to the other wheel of the front and rear wheels in order to change the number of teeth and to change the rotation speed with the other wheel, or as shown in the figure. The gear ratio is changed by changing the number of teeth by replacing the final reduction gear train (not shown) connected to the other of the front and rear wheels.

However, in the conventional power transmission device 104, when changing the gear ratio, the transmission case 110 of the power transmission device 104
It is also necessary to disassemble the final reduction case (not shown) of the final reduction device of the final reduction gear train connected to the distributor case 112 or the other of the front and rear wheels, and to Gears need to be replaced.

Therefore, it is necessary to disassemble various types of cases and replace a large number of gears, so changing the gear ratio takes time and effort, and there is an inconvenience that the gear ratio cannot be changed easily.

Also, by requiring a large number of gears with different numbers of teeth,
There was an inconvenience that the cost of changing the tooth ratio increased.

[Purpose of the invention]

Therefore, an object of the present invention is to make it possible to change the gear ratio without disassembling various types of cases or replacing a large number of gears with different numbers of teeth, thereby making it easy to change the gear ratio. The object of the present invention is to realize a power transmission device for a four-wheel drive vehicle that can reduce the cost of changing the gear ratio.

[Means for solving problems]

In order to achieve this object, the present invention drives one of the front and rear wheels using the driving force taken out from the transmission, and distributes the driving force taken out from the transmission by a driving force distribution device to either the front or rear wheels. In a power transmission device for a four-wheel drive vehicle that drives one or the other, the case of the power transmission device is provided at least divided into a main case portion and a side case portion that is detachable from the main case portion,
A main shaft of the transmission, an intermediate shaft that communicates with one of the front and rear wheels, and an input shaft of the driving force distributor that communicates with the other of the front and rear wheels are supported on the main case portion and the side case portion, respectively. first and second intermediate gear trains that connect the main shaft, the intermediate shaft, and the input shaft, respectively, are removably provided on the side case portion of the main shaft, the intermediate shaft, and the input shaft. It is characterized by:

[Effect]

According to the configuration of the present invention, the intermediate shaft and the front and rear wheels are connected to one another of the main shaft and the front and rear wheels of the transmission which are respectively supported by the main case part and the side case part. First and second intermediate gear trains that connect the main shaft, intermediate shaft, and input shaft, respectively, are removably provided at a portion on the side of the side case portion that is connected to the input shaft of the driving force distributor. As a result, by removing the side case part that is removably attached to the main case part,
Since the intermediate gear train can be exposed, it can be replaced with different first and second intermediate gear trains having different numbers of teeth.

〔Example〕

Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an embodiment of the invention.

In the figure, 2 is an internal combustion engine, 4 is a power transmission device, 6 is a transmission, and 8 is a driving force distributor. This power transmission device 4 drives one of the front and rear wheels using the driving force taken out from the transmission 6, and distributes the driving force taken out from the transmission 6 by a driving force distribution device 8 to either the front or rear wheels. It drives the other.

The case 10 of the power transmission device 4 includes a main case portion 1O-
1 and a side case part 10-2 which is detachably attached to the main case part. In this embodiment, it is further divided into a bottom case portion 10-3. In this case 10, there is provided a transmission installation space 12 in which the transmission 4 is installed, and a driving force distribution device 8.
A distributor space 14 is provided in which a distributor is installed.

In the transmission installation space 12, for example, a torque converter I6 and an auxiliary transmission mechanism 18, which constitute the transmission 6, are arranged. The driving force converted by the torque converter 16 and the auxiliary transmission mechanism 18 is outputted by the main shaft 20. The main shaft 20 passes through the main case portion 10-1 at the other end that is spaced apart from the internal combustion engine 2, and connects to the side case portion 1.
The main first and second bearings 22-1 and 22-1 protrude toward the 0-2 side.
22-2 to be pivotally supported on the main case part 10-1 and the side case part 10-2, respectively.

The main case part 10-1 and the side case part 10-
2 includes an intermediate shaft 24 that connects to either one of the front and rear wheels.
are supported by intermediate first and second bearings 26-1 and 26-2. This intermediate shaft 24 is provided with a one-side final reduction drive gear 30 on one end side, which constitutes one-side final reduction gear train 28 that is disposed in parallel with the main shaft 20 and transmits driving force to either the front or rear wheels. ing. This - side road deceleration drive gear 3
0 is provided in mesh with the negative side path deceleration driven gear 32. The - side path reduction driven gear 32 is fixed to the differential housing 36 of the - individual differential 34 . The differential housing 36 is
It is pivotally supported by the main case part 10-1 and the bottom case part 10-3 by the differential cylinder 1 and second bearings 38-1 and 38-2. Further, a differential gear train 39 is provided within the differential housing 36 .

A driving force distributor 8 is disposed in the distributor space 14 and is connected to the other of the front and rear wheels. In the driving force distributor 8, an input gear 42 and an output gear 44, which are a distribution gear train 40, are provided at one end of an input shaft 46 and an output shaft 48, respectively, and are meshed with each other. The input shaft 46 is disposed in parallel with the main shaft 20, is supported by the input side retainer 48 by first and second input bearings 50-1 and 50-2, and is supported by a third input bearing 50-3. Side case part 1
It is pivotally supported on 0-2.

This input end retainer 48 is attached to the case input side attachment portion 52 of the main case portion 10-1 with attachment bolts 54. Thereby, the input shaft 46 is connected to the input side retainer 4
The main case part 10-1 is rotatably supported by the first and second human-powered bearings 50-1 and 50-2 via the shaft 8, and
It is rotatably supported on the side case portion 10-2 by a third input bearing 50-3. Note that the input side retainer 48 includes:
An input side oil seal 56 is provided.

Further, the output shaft 48 is provided in an output side retainer 58 so as to be pivotally supported by first and second output bearings 60-1 and 60-2. This output side retainer 58 is connected to the main case section 10.
-1 is attached to the case output side attachment part 62. The output shaft 48 has an output gear 44 that meshes with the human gear 42 provided at one end of the input shaft 46 at one end, and the other end protrudes outside the output retainer 58 .

A distributor case 64 is provided outside the output side retainer 58. A transmission shaft 66 is supported by a transmission bearing 68 in the distributor case 64 .

One end of the transmission shaft 66 is provided so as to be engageable and detachable from the other end of the output shaft 46 by a switching mechanism 70 . Also,
The other end of the transmission shaft 66 is provided with a joint 72 to which a propulsion shaft (not shown) is connected to the other of the front and rear wheels (not shown). Note that the distributor case 64 is provided with an output side oil seal 74.

In this way, the power transmission device 4 is connected to the main shaft 2 of the transmission 6.
0, the intermediate shaft 24 that communicates with either one of the front and rear wheels, and the input shaft 46 of the driving force distributor 8 that communicates with the other of the front and rear wheels. They are each pivotably supported. The main shaft 20, the intermediate shaft 24, and the input shaft 46 are connected to the side case part 10-2 at the side of the main shaft 20, the intermediate shaft 24, and the input shaft 46. 76
・78 is removably provided.

That is, the first intermediate gear train 76 includes a first intermediate drive gear 80 and a first intermediate driven gear 82 that transmit the driving force output from the main shaft 20 to either the front or rear wheels. The first intermediate drive gear 80 is detachably engaged with the main shaft 20 between the main case part 10-1 and the side case part 102 by a spline or the like. This first
The first intermediate driven gear 82 that meshes with the intermediate drive gear 80 is
The intermediate shaft 24 is removably engaged with the other end of the intermediate shaft 24 on the side case portion 1O-2 side by means of a spline or the like. Therefore, the first intermediate gear train 76 is provided in close proximity to the inner surface of the side case portion 10-2, and is removably attached to the main shaft 20 and the intermediate shaft 24.

Further, the second intermediate gear train 78 includes a second intermediate drive gear 84 and a second intermediate driven gear 86 that transmit the driving force output from the main shaft 20 to the other of the front and rear wheels. The second intermediate drive gear 84 is provided on the first intermediate drive gear 80 that is removably attached to the main shaft 20 . A second intermediate driven gear 8 that meshes with this second intermediate drive gear 84
6 is a side case portion 1 of the input shaft 46 of the driving force distributor 8;
The other end, which is the part on the 0-2 side, is removably engaged with a spline or the like. Therefore, it is provided in close proximity to the inner surface of the side case portion 10-2 and is detachably attached to the main shaft 20 and the input shaft 46.

Note that reference numerals 88 and 90 indicate fixing nuts that are screwed onto the other ends of the intermediate shaft 24 and the input shaft 46, respectively.

Next, the effect will be explained.

The power transmission device 4 automatically converts the driving force of the internal combustion engine 2 according to the operating state using the torque converter 16 of the transmission 6 and the auxiliary transmission mechanism 18 and outputs it to the main shaft 20, and transmits the driving force to the first intermediate gear train 76. The first intermediate drive gear 80 and the first intermediate driven gear 82 that constitute the side road reduction gear train 28, the one side final reduction drive gear 30 and the side road reduction driven gear 32 that constitute the side road reduction gear train 28.
For example, one of the front and rear wheels (not shown) is driven via the differential 34. The power transmission device 4 also transfers the driving force of the main shaft 20 taken out from the transmission 6 to the second
The input gear 4 of the driving force distributor 8 is connected to the input gear 4 of the driving force distributor 8 via the second intermediate drive gear 84 and the second intermediate driven gear 86 that constitute the intermediate gear train 78.
2 and the output gear 44 to drive the other of the front and rear wheels (not shown).

When changing the tooth ratio of the power transmission device 4, first remove the side case part 10-2 which is removably provided on the main case part 10-1, and then・Expose 78.

Next, the fixing nuts 88 and 90 and the second main bearing 22
-2, the second intermediate bearing 26-2 and the third input bearing 50-3 are removed, and the first and second intermediate gear trains 76 and 78 are removably installed on the main shaft 20, the intermediate shaft 24, and the input shaft 46. , and install different first and second intermediate gear trains 76 and 78 with different numbers of teeth.

Thereby, the tooth number ratio of the power transmission device 4 can be changed.

In this way, the main shaft 20, the intermediate shaft 24, and the input shaft 46, which are pivotally supported in the main case part 10-1 and the side case part 10-2, are provided at the parts on the side case part 10-2 side. By detachably providing first and second intermediate gear trains 76 and 78 that connect the main shaft 20, intermediate shaft 24, and input shaft 46, respectively, the main case portion 10-1
Since the first and second intermediate gear trains 76 and 78 can be exposed by removing the side case part 10-2 that is removably provided in the It can be replaced with columns 76 and 78.

Therefore, by simply removing the side case portion 10-2, the gear ratio can be changed, which makes it possible to change the final reduction gear of the final reduction gear train connected to the distributor case or the other of the front and rear wheels. There is no need to disassemble the final reduction case, etc. (Also, there is no need to replace a large number of gears because the gear ratio can be changed by replacing only the first and second intermediate gear trains 76 and 78. Therefore, it is possible to change the gear ratio without having to disassemble various cases or replace many gears with different numbers of teeth, and it is also possible to change the gear ratio without having to prepare many gears with different numbers of teeth. Thereby, the tooth ratio can be easily changed and the cost of changing the tooth ratio can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, the intermediate shaft and the front and rear wheels, which are connected to either the main shaft and the front and rear wheels of the transmission which are respectively pivotally supported in the main case part and the side case part, and the front and rear wheels are connected to each other. First and second intermediate gear trains, which connect the main shaft, the intermediate shaft, and the input shaft, respectively, are removably provided at a portion on the side of the side case portion that communicates with the input shaft of the driving force distributor. As a result, by removing the side case part that is removably attached to the main case part, the first
- Since the second intermediate gear train can be exposed, it can be replaced with different first and second intermediate gear trains having different numbers of teeth.

Therefore, by simply removing the side case part, the gear ratio can be changed, so that the final reduction case of the final reduction gear of the final reduction gear train connected to the distributor case or the other of the front and rear wheels, as in the past. There is no need to disassemble etc.
Further, since the gear ratio can be changed by replacing only the first and second intermediate gear trains, there is no need to replace a large number of gears. Therefore, it is possible to change the gear ratio without having to disassemble various cases or replace many gears with different numbers of teeth, and it is also possible to change the gear ratio without having to prepare many gears with different numbers of teeth. do not have. Thereby, the tooth ratio can be easily changed, and the cost of changing the tooth ratio can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a power transmission device for a four-wheel drive vehicle showing an embodiment of the present invention. FIG. 2 is a schematic sectional view of a conventional power transmission device for a four-wheel drive vehicle. In the figure, 2 is an internal combustion engine, 4 is a power transmission device, 6 is a transmission, 8 is a driving force distribution device, 10 is a case, 10-1 is a main case part, 10-2 is a side case part, and 20 is a main shaft. , 24 is an intermediate shaft, 28 is one side final reduction gear train, 34 is an example differential, 40 is a distribution gear train, 46 is an input shaft, 48 is an output shaft, 76 is a first intermediate gear train, 78 is a second intermediate gear train A gear train, 80 is a first intermediate drive gear, 82 is a first intermediate driven gear,
84 is a second intermediate drive gear, and 86 is a second intermediate driven gear.

Claims (1)

[Claims] 1. A four-wheel drive vehicle in which one of the front and rear wheels is driven by the driving force taken out from the transmission, and the driving force taken out from the transmission is distributed by a driving force distribution device to drive the other one of the front and rear wheels. In the power transmission device, the case of the power transmission device is divided into at least a main case portion and a side case portion that is detachable from the main case portion, and the main shaft of the transmission and one of the front and rear wheels are attached to the main shaft of the transmission. An intermediate shaft that communicates and an input shaft of the driving force distributor that communicates with the other of the front and rear wheels are respectively pivotally supported in the main case part and the side case part, and the main shaft, the intermediate shaft, and the input shaft are connected to each other. A power transmission device for a four-wheel drive vehicle, characterized in that first and second intermediate gear trains connecting the main shaft, intermediate shaft, and input shaft, respectively, are removably provided on the side portion of the side case portion. .