JPH09216523A - Four-wheel drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the clearance of an oil pan and a transfer case, by forming a boss for insertion and a boss for screwing to superpose the outermost periphery forming line of a fastening seat surface to the outermost periphery forming lines of the right side bearing and the left side bearing. SOLUTION: An insertion boss 60 for a fastening bolt 58 is formed to the right side case 10. A screwing boss 62 for a fastening bolt 58 is formed to the left side case 12. The axial centers F of the insertion boss 60 and the screwing boss 62 are approched to the axial center G of a transfer input shaft 14. To the outermost periphery forming line D of the fastening seat surface 74 of the insertion boss 60, a superposing H with the outermost periphery forming line E of the right side bearing 22 of the input shaft 14 is generated. By such a way, the fastening seat surface 74 of the insertion boss 60 is positioned to the outer side of a transfer case from the installing surface 76 of the right side bearing 22 of the input shaft 14. Consequently, the fastening seat surface 74 is prevented from interfeing with the outer ring of the right side bearing 22 of the input shaft 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-wheel drive system, and more particularly, it is possible to secure a clearance between the oil pan and the transfer case without changing the shape of the oil pan, and to improve the assemblability of the transfer case. Can improve,
The present invention relates to a four-wheel drive device that can set a transfer case into a shape that can be mounted without reducing the size of a bearing of the transfer and can improve the mountability of the transfer.

[0002]

2. Description of the Related Art Some vehicles are equipped with a four-wheel drive system for driving all front and rear wheels. The four-wheel drive system is provided with a transmission connected to an engine mounted horizontally on a vehicle, and a transfer is provided to the transmission.
There is one in which either the front wheel or the rear wheel is driven by the driving force output from the transmission and the other of the front wheel or the rear wheel is driven by the driving force output from the transfer.

An example of such a four-wheel drive device is shown in FIG. In FIG. 7, 102 is a four-wheel drive device and 104 is a transfer. Transfer 104
Is provided with the transfer case 106 formed on the right side case portion 108 and the left side case portion 110.

The transfer 104 has a transfer input shaft 112, a transfer first intermediate shaft 114, a transfer second intermediate shaft 116, and a transfer output shaft 118 as transfer shafts. The transfer input shaft 112 includes the right side case portion 108 and the left side case portion 1.
Input shaft right side bearing 120 and input shaft left side bearing 1 respectively
It is pivotally supported by 22.

The transfer first intermediate shaft 114 is provided on the right case portion 108 and the left case portion 110 by a first intermediate shaft right bearing 124 and a first intermediate shaft left bearing 126, respectively. The transfer second intermediate shaft 116 is
The right side case portion 108 and the left side case portion 110 each have a second
The intermediate shaft right bearing 128 and the second intermediate shaft left bearing 130 are pivotally supported.

The transfer output shaft 118 is axially supported by an extension case portion 132 attached to the left case portion 110 by an output shaft first bearing 134 and an output shaft second bearing 136, respectively.

In the transfer 104, an input gear 138 is provided on the transfer input shaft 112, a first intermediate input gear 140 and a first intermediate output gear 142 are provided on the transfer first intermediate shaft 114, and a second intermediate shaft is provided on the transfer second intermediate shaft 116. An intermediate input gear 144 and a second intermediate output gear 146 are provided, and an output gear 148 is provided on the transfer output shaft 118.

The transfer 104 includes gears 138-1.
The driving force output from the transmission (not shown) is distributed to the transfer input shaft 112 by the engagement of 48 and is input to the transfer first intermediate shaft 114 and the transfer second intermediate shaft 116.
And output from the transfer output shaft 118 via.

Reference numeral 150 is a drive axle connected to a differential gear provided in a transmission (not shown). Drive axle 1
50 transmits the driving force to either one of the front wheels and the rear wheels. Further, reference numeral 152 is a coupling member provided at the output end of the transfer output shaft 118. The coupling member 152 is coupled to a propulsion shaft (not shown) and transmits the driving force to either the front wheel or the rear wheel.

In this four-wheel drive system 102, the transfer case 106 of the transfer 104 is replaced by the right case part 1
08 and the left side case portion 110 are formed, and in order to connect the right side case portion 108 and the left side case portion 110 with the tightening bolt 154, the right side case portion 108 is provided with an insertion boss portion 156 through which the tightening bolt 154 is inserted. It is formed and provided, and the tightening bolt 15 is attached to the left side case portion 110.
4 is provided by forming a screwing boss portion 158 to be screwed.

An insertion hole 160 is formed in the insertion boss portion 156. A screwing hole 162 is formed in the screwing boss portion 158. The tightening bolt 154 is
The bolt shaft portion 164 is inserted in the insertion hole 160 of the insertion boss portion 156.
Is inserted into the threaded boss 158 and screwed into the threaded hole 162 of the threaded boss 158, and the bolt seating surface 168 of the bolt head 166 is pressed against the tightening seating surface 170 of the insertion boss 158. 108 and the left case part 110 are connected.

An example of such a four-wheel drive system is disclosed in Japanese Patent Laid-Open No. 62-163828. What is disclosed in this publication is a four-wheel drive device in which a viscous clutch is provided between a rotary shaft of a transfer and a propeller shaft, and a propeller shaft side flange of a viscous clutch that rotates integrally with one clutch plate and another The bearing that can support the thrust load is provided between the clutch plate and the rotating shaft of the transfer to which the hub of the viscous clutch that rotates integrally is connected.

[0013]

By the way, in the four-wheel drive system 102 shown in FIG. 7, the tightening bolts 154 of the transfer 104 are all of the same length to determine the shape of the transfer case 106. Insertion boss 15
6, the length A from the right side coupling surface 172 of the right side case portion 106 to the tightening seating surface 170 is 6 as shown in FIG.
Than the length C to the mounting surface 174 where 20 is mounted,
It is formed to be short.

Accordingly, the insertion boss portion 156 is formed so that the tightening seat surface 170 is located on the inner side of the transfer case 106 than the mounting surface 174 on which the input shaft right bearing 120 is mounted. .

However, the insertion boss portion 156 and the threaded boss portion 158, as shown in FIG.
0 so that the outermost peripheral forming line D of the tightening seat surface 170 does not overlap the outermost peripheral forming line E of the input shaft right bearing 120, that is, the tightening seat surface 170 does not interfere with the outer ring of the force shaft right bearing 120. The axis F of the insertion boss 156 and the threaded boss 158 must be separated outward from the axis G of the transfer input shaft 112.

Therefore, the conventional four-wheel drive system 102 is
The insertion boss portion 156 and the threaded boss portion 158 are projected to the engine side (not shown), and the oil pan 17
6 is caused, and it becomes difficult to secure the clearance J between the oil pan 176 and the transfer case 106 due to the interference with the oil pan 176, and there is an inconvenience that the assembling property is deteriorated.

Further, the interference with the oil pan 176 causes a problem that the shape of the oil pan 176 needs to be changed when the transfer 104 is assembled. Therefore, in the conventional four-wheel drive system 102, when the shape of the oil pan 176 is changed in order to avoid the interference with the oil pan 176, the amount of oil is reduced.

On the other hand, the tightening bolts 154 have the same length, and the length of the insertion boss 156 up to the tightening seat surface 170 is A, so that the transfer case 1 can be mounted.
When 04 is formed, the tightening seat surface 170 is formed as described above.
It becomes difficult to separate the shaft center F of the insertion boss portion 156 and the screwing boss portion 158 from the shaft center G of the transfer input shaft 112 so that the interference does not interfere with the outer ring of the input shaft right bearing 120. As a result, There is a problem that the input shaft right bearing 120 and the input shaft left bearing 122 are downsized.

Therefore, in the conventional four-wheel drive vehicle 102, the shafts of the insertion boss portion 156 and the threaded boss portion 158 are prevented so that the input shaft right side bearing 120 and the input shaft left side bearing 122 are not downsized. When the center F is formed apart from the axis G of the transfer input shaft 112, the oil pan 17
However, there is a problem in that mounting is difficult due to the interference with 6.

[0020]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a transmission connected to the engine and a transfer connected to the transmission.
A four-wheel drive device for driving either one of a front wheel and a rear wheel by a driving force output from the transmission and driving the other of a front wheel and a rear wheel by a driving force output from the transfer, wherein: Transfer cases are formed in the right side case part and the left side case part, and transfer shafts are rotatably supported in the right side case part and the left side case part by the right side bearing and the left side bearing, respectively. One of the parts is provided with an insertion boss part through which the tightening bolt is inserted, and the other is formed with a threaded boss part to which the tightening bolt is screwed, and the insertion boss part is provided. When the tightening seat surface is located on the outer side of the transfer case with respect to the mounting surface on which either the right bearing or the left bearing is mounted. Outermost formation wire of the clamping bearing surface is characterized by providing forming said inserting boss and screwing the boss portion so as to overlap the outermost formation wire of the right bearing and the left bearing also.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION In the four-wheel drive system of the present invention, a transfer case of a transfer is formed in a right case part and a left case part, and a transfer shaft is provided in the right case part and the left case part by a right bearing and a left bearing, respectively. The boss is provided so as to be axially supported, and one of the right side case and the left side case is provided with an insertion boss into which the tightening bolt is inserted, and the other side is also provided with a screwed boss to which the tightening bolt is screwed. Are formed and provided.

As a result, the insertion boss portion and the threaded boss portion are not projected toward the engine side, there is no problem of interfering with the oil pan, and the tightening seat surface does not interfere with the bearing. There is no.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show an embodiment of the present invention. In FIG. 6, 2 is a four-wheel drive device. This 4
The wheel drive device 2 is provided with a transmission (not shown) connected to the engine 4, and a transfer 6 connected with the transmission.

The four-wheel drive system 2 drives either one of a front wheel and a rear wheel (not shown) by a driving force output from the transmission, and a driving force output by the transfer 6 drives either a front wheel or a rear wheel. Drive the other.

As shown in FIGS. 3 to 5, the transfer 6 is provided with a transfer case 8 formed on the right side case portion 10 and the left side case portion 12.

The transfer 6 has a transfer input shaft 14, a transfer first intermediate shaft 16, a transfer second intermediate shaft 18, and a transfer output shaft 20 as transfer shafts.

The transfer input shaft 14 is mounted on the right case portion 10 and the left case portion 12 by an input shaft right bearing 22 and an input shaft left bearing 24, respectively.

The transfer first intermediate shaft 16 is mounted on the right case portion 10 and the left case portion 12 by a first intermediate shaft right bearing 26 and a first intermediate shaft left bearing 28, respectively. The transfer second intermediate shaft 18 includes the second intermediate shaft right bearing 3 in the right case portion 10 and the left case portion 12, respectively.
0 and the second intermediate shaft left bearing 32 are provided so as to be axially supported.

The transfer output shaft 20 has an output case first bearing 38 and an output shaft second bearing 4 in an extension case part 36 attached to the left side case part 12 by an attachment bolt 34, respectively.
It is supported by 0.

The transfer 6 is the transfer input shaft 1
4 is provided with an input gear 42. The transfer first intermediate shaft 16 is provided with a first intermediate input gear 44 and a first intermediate output gear 46. The first intermediate input gear 44 meshes with the input gear 42.

The transfer second intermediate shaft 18 is provided with a second intermediate input gear 48 and a second intermediate output gear 50. The second intermediate input gear 48 meshes with the first intermediate output gear 46. An output gear 52 is provided on the transfer output shaft 20. The output gear 52 meshes with the second intermediate output gear 50.

The transfer 6 distributes and inputs the driving force output from the transmission (not shown) to the transfer input shaft 14 by the meshing of the gears 42 to 52, and the transfer first intermediate shaft 16 and the transfer second intermediate shaft 18 are connected to each other. Is output from the transfer output shaft 20 via.

Reference numeral 54 is a drive axle connected to a differential gear provided in the transmission (not shown). The drive axle 54 transmits the drive force to either the front wheel or the rear wheel. Further, reference numeral 56 is a coupling member that couples the transfer output shaft 20 to a propulsion shaft (not shown). Coupling member 56
Transmits the driving force to the other one of the front wheel and the rear wheel by the propulsion shaft.

The four-wheel drive system 2 is provided with the transfer case 8 of the transfer 6 formed in the right case part 10 and the left case part 12. As shown in FIGS. 1 and 2, an insertion boss portion 60 through which the tightening bolt 58 is inserted is attached to the right-side case portion 10 so as to be connected to the right-side case portion 10 and the left-side case portion 12 with the tightening bolt 58. The left side case portion 12 is provided with a screwing boss portion 62 to which the tightening bolt 58 is screwed.

An insertion hole 64 is formed in the insertion boss 60. A threaded hole 66 is formed in the threaded boss portion 62. The tightening bolt 58 inserts the bolt shaft portion 68 into the insertion hole 64 of the insertion boss portion 60 and is screwed into the screw attachment hole 66 of the screw attachment boss portion 62 to insert the bolt seat surface 72 of the bolt head 70. The right side case portion 10 and the left side case portion 12 are joined by pressing and abutting against the tightening seat surface 74 of the boss portion 60.

The insertion boss 60 and the threaded boss 6
2, the insertion boss portion 60 and the screwing boss portion 62 formed in the portions of the right side case portion 10 and the left side case portion 12 separated from the engine 2 are the right side of the right side case portion 10 as shown in FIG. The length A from the coupling surface 76 to the tightening seat surface 74 of the insertion boss portion 60 is greater than the length C from the right coupling surface 76 to the mounting surface 78 to which the input shaft right bearing 22 of the right case portion 10 is attached. It is formed to be short.

On the other hand, of the insertion boss portion 60 and the threaded boss portion 62, the insertion boss portions formed at the portions of the right side case portion 10 and the left side case portion 12 in close proximity to the oil pan 80 of the engine 2. 60 and screwing boss 62
As shown in FIG. 2, the right side connecting surface 7 of the right side case portion 10 is
6 to the tightening seat surface 74 of the insertion boss 60 B
Is formed to be longer than the length C from the right side coupling surface 76 to the mounting surface 78 on which the input shaft right side bearing 22 of the right side case portion 10 is mounted.

Further, the insertion boss 60 and the screwing boss 6 which are formed at the portion closely facing the oil pan 80.
As shown in FIG. 1, the shaft center F of the insertion boss portion 60 and the threaded boss portion 62 is brought close to the shaft center G of the transfer input shaft 14 so that the tightening seat surface 74 of the insertion boss portion 60 is fixed. The outermost circumference forming line D is formed so as to overlap the outermost circumference forming line E of the input shaft right bearing 22 and the input shaft left bearing 24.

As a result, in the transfer 6, the tightening seat surface 74 of the insertion boss 60 is attached to either the input shaft right bearing 22 or the input shaft left bearing 24, or the input shaft right bearing 22 in FIG. It is positioned on the outer side of the transfer case 8 with respect to the mounting surface 76, and the outermost peripheral formation line D of the tightening seat surface 74 overlaps with the outermost peripheral formation line E of the input shaft right bearing 22 and the input shaft left bearing 24. The insertion boss portion 60 and the threaded boss portion 62 are formed in a portion of the engine 2 that is close to and opposed to the oil pan 80.

That is, the transfer 6 has the tightening seat surface 74 of the insertion boss 60 provided on the right case 10.
Is located on the outer side of the transfer case 8 with respect to the mounting surface 76 on which the input shaft right bearing 22 is mounted, so that the tightening seat surface 74 does not interfere with the outer ring of the input shaft right bearing 22. In this way, the insertion boss portion 60 in which the tightening seat surface 74 does not interfere with the outer ring of the input shaft right bearing 22 can bias the shaft center F toward the shaft center G side of the transfer input shaft 14.

As a result, the transfer 6 has the oil of the engine 2 such that the outermost peripheral line D of the tightening seat surface 74 overlaps the outermost peripheral line E of the input shaft right bearing 22 and the input shaft left bearing 24 by H. The shaft center F of the insertion boss portion 60 and the screwing boss portion 62 of the portion that closely faces the pan 80 is formed in the vicinity of the shaft center G of the transfer input shaft 14.

As described above, in the four-wheel drive system 2, the tightening seat surface 74 of the insertion boss 60 is located on the outer side of the transfer case 8 with respect to the mounting surface 76 on which the right bearing 22 is mounted. The insertion boss portion 60 and the screwing boss portion 62 are formed such that the outermost peripheral line D of the tightening seat surface 74 overlaps the outermost peripheral line E of the input right bearing 22 and the input shaft left bearing 24. As a result, the problem of interference with the oil pan 80 without protruding to the engine 4 side can be avoided, and interference of the tightening seat surface 74 with the input right bearing 22 and the input shaft left bearing 24 is avoided. it can.

Therefore, in the four-wheel drive system 2, the oil pan 8 does not need to be changed in shape.
The clearance J between 0 and the transfer case 8 can be secured, the assembling property of the transfer case 8 can be improved, and the change in the shape of the oil pan 80 is not required, so that the reduction of the oil amount is avoided. can do.

In addition, the four-wheel drive system 2 can be set to a shape in which the transfer case 8 can be mounted without causing downsizing of the input right side bearing 22 and the input shaft left side bearing 24 of the transfer 6, and The mountability of No. 6 can be improved.

[0045]

As described above, the four-wheel drive system of the present invention avoids the problem that the insertion boss portion and the threaded boss portion of the transfer case do not project to the engine side and interfere with the oil pan. It is possible to prevent the tightening seat surface from interfering with the bearing.

Therefore, the four-wheel drive system can secure the clearance between the oil pan and the transfer case without changing the shape of the oil pan, and can improve the assembling property of the transfer case. The transfer case can be set to a shape in which the transfer case can be mounted without reducing the size of the bearing, and the mountability of the transfer can be improved.

[Brief description of drawings]

1 is an enlarged cross-sectional view of an arrow I portion of FIG. 3 showing an embodiment of a four-wheel drive system according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a right case portion of the transfer.

FIG. 3 is a sectional view of a transfer.

FIG. 4 is a plan view of a transfer.

FIG. 5 is a side view of the transfer.

FIG. 6 is a schematic side view of a four-wheel drive system.

FIG. 7 is a sectional view of a transfer showing a conventional example of a four-wheel drive system.

FIG. 8 is an enlarged cross-sectional view of a right case portion of the transfer.

[Explanation of symbols]

 2 4 wheel drive device 4 engine 6 transfer 8 transfer case 10 right side case part 12 left side case part 14 transfer input shaft 22 input shaft right side bearing 24 input shaft left side bearing 58 tightening bolt 60 insertion boss part 62 screwing boss part 64 insertion hole 66 screwing hole 68 bolt shaft portion 70 bolt head portion 72 bolt seating surface 74 tightening seating surface 76 right coupling surface 78 mounting surface 80 oil pan

Claims (2)

[Claims] 1. A transmission is connected to an engine, a transfer is connected to the transmission, and one of front wheels and rear wheels is driven by a driving force output from the transmission and the transfer is performed. In a four-wheel drive device that drives either the front wheel or the rear wheel by the driving force output from the transfer case, the transfer case of the transfer is formed in the right case part and the left case part, and is provided in the right case part and the left case. Transfer shafts are supported by the right bearing and the left bearing, respectively, and a boss portion for inserting a tightening bolt is formed in either one of the right case portion and the left case portion, and the other one is also provided. A screwing boss portion to which the tightening bolt is screwed is formed, and the tightening seat surface of the insertion boss portion is provided on the right bearing and the left side. It is positioned on the outer side of the transfer case with respect to the mounting surface on which either one of the side bearings is mounted, and the outermost peripheral forming line of the tightening seat surface is overlapped with the outermost peripheral forming lines of the right bearing and the left bearing. A four-wheel drive device characterized in that a general boss portion and a threaded boss portion are formed and provided. 2. In the transfer, the tightening seat surface of the insertion boss portion is located on the outer side of the transfer case with respect to the mounting surface on which either the right bearing or the left bearing is mounted, and the tightening seat surface. Characterized in that the insertion boss portion and the screwing boss portion are formed at least at a portion which closely faces the engine so that the outermost peripheral formation line of is overlapped with the outermost peripheral formation lines of the right bearing and the left bearing. The four-wheel drive system according to claim 1.