JP2001001777A - Transfer structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce parts number and the like for saving cost and prevent oil leakage by providing a flange joint mechanism in which a propeller shaft is detachably connected with a transfer output shaft, and a sealing material between a transfer case and the transfer output shaft in a full-time four-wheel drive. SOLUTION: This transfer is for full-time four-wheel drives and a front-side propeller shaft 34 is detachably connected with an output-side end of a transfer- side output shaft 72 by a flange joint mechanism 28. The flange joint mechanism 28 has a joint main body 104 connected with an output-side mounting flange 92. By loosening a connection bolt 114 to remove the joint main body 104, driving condition can be set in two-wheel drive. Further, a space between a transfer case and the transfer-side output shaft 72 is sealed with a seal member 98 to prevent oil leakage inside the transfer. With this configuration, a two- wheel/four-wheel switching mechanism becomes unnecessary and thus parts number and man-hour for assembly are reduced to save cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile transfer structure, and more particularly to an automobile transfer structure in which a propeller shaft is connected to a transfer output shaft.

[0002]

2. Description of the Related Art A vehicle includes, as a power transmission device, a transmission, a differential, and a transfer for distributing the driving force from a transmission side in order to convert the driving force of an engine to a required value in accordance with running conditions and to extract the driving force. ing.

[0003] In addition, there is a four-wheel drive vehicle that drives all four wheels of a front wheel and a rear wheel. This four-wheel drive vehicle has
There are so-called part-time four-wheel drive vehicles that can be switched between a two-wheel drive state and a four-wheel drive state, and so-called full-time four-wheel drive vehicles that are always in a four-wheel drive state.

[0004] As a power transmission device for a part-time four-wheel drive vehicle, for example, there is one shown in FIG. 8, reference numeral 202 denotes an engine of a four-wheel drive vehicle (not shown) of a front engine rear drive (FR), 204 denotes a transmission, and 206 denotes a transfer. Engine 2
02 is connected to a transmission case 208 of the transmission 204, and the transmission case 208 is connected to a transfer case 210 of the transfer 206.

A rear propeller shaft (not shown) is connected to an output end of the main shaft 212 supported by the transmission case 208 and supported by the transfer case 210.

In the transfer 206, a transfer output shaft 214 parallel to the main shaft 212 is supported by a transfer case 210.
At the output end of 14, a front propeller shaft (not shown)
Are connected to each other. The transfer 206 includes a drive sprocket 216 mounted on the main shaft 212.
And the driven sprocket 218 attached to the transfer output shaft 214 and the transfer chain 220, the driving force of the main shaft 212 is transferred to the transfer output shaft 2
14.

The transfer 206 is provided with a two-wheel / four-wheel switching mechanism 222. In the two-wheel / four-wheel switching mechanism 222, a shaft side hub 224 adjacent to a drive sprocket 2108 attached to the main shaft 212 is fixedly provided, and a switching sleeve 226 is spline-fitted to the shaft side hub 224 so as to be movable in the axial direction. And a sprocket-side hub 228 in which the switching sleeve 226 is engaged and disengaged from the drive sprocket 216 is separately provided.
A switching shaft 232 is provided for moving the switching fork 230 engaged with 26 in the engaging / disengaging direction.

As a result, the driving force transmitted to the transfer output shaft 214 by the two-wheel / four-wheel switching mechanism 222 can be intermittently switched between two-wheel drive and four-wheel drive.

FIG. 9 shows a power transmission device for a full-time four-wheel drive vehicle, for example. In FIG. 9, reference numeral 302 denotes a front engine rear drive (F
R) an engine of a four-wheel drive vehicle (not shown), 304 is a transmission, and 306 is a transfer. A transmission case 308 of a transmission 304 is connected to the engine 302.
Is connected to the transfer case 310 of the transfer 306.

A rear propeller shaft (not shown) is connected to an output side end of the main shaft 312 supported by the transmission case 308 and supported by the transfer case 310.

In the transfer 306, a transfer output shaft 314 is supported by a transfer case 310 in parallel with the main shaft 312. A front propeller shaft (not shown) is connected to an output end of the transfer output shaft 314. Is provided. The transfer 306 transmits the driving force of the main shaft 312 to the transfer output shaft 314 by the drive sprocket 316, the driven sprocket 318, and the transfer chain 320.

The transfer 306 is provided with a two-wheel drive switching mechanism 322. The two-wheel drive switching mechanism 322 is provided with a shaft side hub 324 fixedly provided adjacent to a drive sprocket 314 mounted on a main shaft 312, and a switching sleeve 326 is spline-fitted to the shaft side hub 324 so as to be movable in the axial direction. The drive sprocket 316 is integrally provided with a sprocket-side hub 328 in which the switching sleeve 326 is engaged and disengaged. A switching shaft 332 to be moved is provided.

In this manner, the drive sprocket 314 is fixed to the main shaft 312 by the two-wheel drive switching mechanism 322 during normal operation, so that the transfer output shaft 3
14 to transmit four wheels.

On the other hand, when the vehicle is towed due to a failure or the like, the drive sprocket 314 can be rotated around the main shaft 312 by the two-wheel drive switching mechanism 322,
The driving force transmitted to the transfer output shaft 314 can be cut off to achieve two-wheel drive with only the rear wheels, and the front wheels can be lifted and towed by the rear wheels.

In such a transfer structure,
As shown in FIG. 10, a driven sprocket 402 is integrated with a transfer output shaft 404 by a sliding yoke type joint mechanism 406 to form a propeller shaft 408.
Are linked.

Further, as a transfer structure of an automobile, for example, Japanese Patent Application Laid-Open No. 10-78115 and
No. 0-122340. The publications described in these publications describe front engine rear drive vehicles (F
R), the front transfer output shaft is provided with a two-wheel / four-wheel switching mechanism for switching between two-wheel drive and four-wheel drive,
It switches between two-wheel drive and four-wheel drive when necessary.

[0017]

By the way, in the conventional transfer structure, as shown in FIG. 9, in the case of a full-time four-wheel drive vehicle, the vehicle is always in a four-wheel drive state. A two-wheel drive switching mechanism is provided in consideration of when it is necessary to use two-wheel drive such as when the vehicle cannot be driven and the vehicle is towed on a drum tester at the time of vehicle inspection.

However, since the two-wheel drive switching mechanism, which is not always necessary, is provided, there is a disadvantage that the number of parts and the number of assembling steps are increased, thereby increasing costs.

Further, in the case of two-wheel drive, it is possible to remove the propeller shaft, but if the propeller shaft is removed from the transfer output shaft, there is a disadvantage that oil leaks from a portion of the transfer case which supports the transfer output shaft. was there.

[0020]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a transfer that always drives the vehicle in a four-wheel drive state, and a transfer sprocket is attached to a transfer case of the transfer. In a transfer structure of an automobile in which a transfer output shaft is provided to support and a propeller shaft is connected to the transfer output shaft, the propeller shaft is detachably attached to the transfer output shaft.
A flange joint mechanism provided with a mounting flange on the transfer output shaft is provided, and a seal member for sealing between the transfer case and the transfer output shaft is provided.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is directed to a full-time four-wheel drive vehicle in which a propeller shaft is detachably mounted on a transfer output shaft by a flange joint mechanism, so that there is no need for a two-wheel / four-wheel switching mechanism. During vehicle inspection and towing, the propeller shaft can be removed to bring the motorcycle into a two-wheel drive state, which reduces the number of parts and assembly man-hours, reduces costs, and uses a seal member to transfer the transfer case and the transfer output shaft. Can be prevented from flowing out of the oil in the transfer even if the propeller shaft is removed.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 4 show a first embodiment of the present invention. In FIG. 4, reference numeral 2 denotes a four-wheel drive vehicle of a front engine rear drive (FR) as a vehicle; 4.4, a side frame; 6.6, a front axle;
8 is a front wheel, 10 and 10 are rear axles, and 12 and 12 are rear wheels. The four-wheel drive vehicle 2 is a full-time one that is always in a four-wheel drive state. The front axle 6 is attached to a front differential 14. The rear axle 10 is attached to a rear differential 16.

The engine 18 is mounted on the side frames 4.
And a power unit 24 integrated with the transmission 20 and the transfer 22 are mounted on a mounting mechanism 26.
6 for elastic support. Further, the transfer 22 includes a flange joint mechanism 2 attached to the front differential 14.
8, a front propeller shaft 34 connected to the front joint mechanism 30 via a viscous joint 32, and a rear propeller shaft connected to the rear differential 16 via first and second rear and second joint mechanisms 36 and 38. 40 are connected.

As shown in FIG. 2, the engine 18 is provided with a transmission case 42 of the transmission 20 connected thereto. The transmission case 42 includes an upper transmission case 42-1 and a lower transmission case 42-1.
Consists of two. The transfer case 44 of the transfer 22 is connected to the transmission case 42. The transfer case 44 includes a front transfer case 44-1 and a rear transfer case 44-.
2 and are connected by a transfer case mounting bolt 44A.

In the transmission 20, the input shaft 46 has the input bearing 4 held by the transmission case 42.
8, a main shaft 50 is coaxially provided with the input shaft 46 and is supported by a main bearing 52 held by the transmission case 42 and the transfer case 44. A counter shaft 54 is supported by a counter bearing 56 held by the transmission case 42 in parallel with the main shaft 50, and a reverse idler shaft 58 is supported by the transmission case 42 in parallel with the main shaft 50 and the counter shaft 54. It is provided.

In the transmission 20, the input shaft 46, the main shaft 50, and the reverse idler shaft 5
8 and each speed change gear train 60 of the forward gear and the reverse gear
And a speed change mechanism 62 for switching between the respective speed change gear trains 60 is provided. A rear propeller shaft 40 is connected to an output side end of the main shaft 50 that is supported by the transfer case 44 via a rear first joint mechanism 36. A drive sprocket 70 is fixed to the main shaft 50 by a washer 66 and a spacer 68 via a bush 64.

The transfer 22 keeps the four-wheel drive vehicle 2 in a four-wheel drive state. This transfer 22
As shown in FIGS. 2 and 3, the transfer output shaft 72 is connected to the front transfer case 44-1 and the rear transfer case 4 in parallel with the main shaft 50 and the counter shaft 54.
4-2 are supported by the front output bearing 74 and the rear output bearing 76 which are held. A front propeller shaft 34 is detachably connected to the output side end of the transfer side output shaft 72 by a flange joint mechanism 28.
A driven sprocket 78 is provided on the transfer side output shaft 72 at a position corresponding to the drive sprocket 70.
Are provided by spline fitting. A transfer chain 8 is attached to the drive sprocket 70 of the main shaft 50 and the driven sprocket 78 of the transfer output shaft 72.
0 is wound.

As shown in FIG. 3, the transfer output shaft 72 has a shaft spline 82 into which a driven sprocket 78 is fitted, a front bearing support 84 on one side of the shaft spline 82, and a front bearing support 84. 84
A center side step portion 88 which is a step portion which is continuously provided with the seal support portion 86, and an output shaft side mounting flange 92 which is a mounting flange which is connected to the seal support portion 86 and is provided via an outer step portion 90. The other side bearing support portion 94 of the shaft side spline 82 and a screw portion 96 connected to the other side bearing support portion 94 are provided.

The seal support portion 86 is provided with a seal member 98 made of a rubber material or the like which seals with the front transfer case 44-1.

A fastening nut 100 which is fastened in contact with the rear output bearing 76 is screwed to the screw portion 96.

In the flange joint mechanism 28, FIGS.
As shown in FIG. 3, a plurality of (for example, six) output shaft-side mounting screw holes 102 are formed in the output shaft-side mounting flange 92 at equal intervals in the circumferential direction.
Are formed. The output shaft side mounting flange 9
The joint body 104 is connected to 2. This joint body 1
Reference numeral 04 denotes a front flange portion 108 in which a plurality of connection screw holes 106 are formed in the axial direction and a rear flange portion 112 in which a plurality of flange-side mounting holes 110 corresponding to the output shaft-side mounting screw holes 102 are formed. Become. This rear flange 1
12 is attached to the output shaft side mounting flange 92 by screwing the connection bolt 114 inserted through the flange side mounting hole 110 into the output shaft side mounting screw hole 102. The joint body 104 is provided with a DOJ (double offset joint) body 116. This DOJ body 1
Reference numeral 16 denotes a connection bolt 12 inserted through the bolt insertion hole 118.
0 is connected to the joint body 104 by being screwed into the connection screw hole 106.

Next, the operation of the first embodiment will be described.

In the four-wheel drive vehicle 2, since the vehicle is always driven in a four-wheel drive state, the driving force of the engine 18 is constantly transmitted to the front propeller shaft 34 and the rear propeller shaft 40.

At the time of vehicle inspection or towing, when the connecting bolt 114 of the flange joint mechanism 28 is loosened and removed, the rear flange 112 of the joint main body 104 can be separated from the output shaft side mounting flange 92, and the two-wheel -Even without the four-wheel switching mechanism, remove the front propeller shaft 34,
The four-wheel drive vehicle 2 can be brought into a two-wheel drive state. At this time, the end portion of the front propeller shaft 34 on the transfer 22 side may be held by the vehicle body, or the other of the front propeller shaft 34 may be detached from the front joint mechanism 30 to handle the front propeller shaft 34 separately. Can be.

Accordingly, since the two-wheel / four-wheel switching mechanism is not required, the number of parts and the number of assembling steps can be reduced, and the cost can be reduced.

In this way, even if the front propeller shaft 34 is removed, since the space between the transfer case 44 and the transfer output shaft 72 is sealed by the seal member 98, the oil in the transfer 22 is prevented from flowing out. Can be prevented.

FIG. 5 shows a first modification of the first embodiment.

In the first modified example, in the transfer 22, as shown in FIG. 5, the transfer output shaft 72 is of a two-part type, and a driven sprocket 78 is integrally formed with a shaft support 72A and an output shaft. And a flange portion 72B having a side mounting flange 92. The shaft support 72A is
Both ends are front and rear transfer cases 44-1, 44
-2, which are supported by front and rear output bearings 74 and 76. The flange portion 72B is provided at the seal support portion 86 by being fitted to the spline portion 132 of the shaft support portion 72A. The flange portion 72B is attached to the shaft support portion 72A by a fastening nut 136 screwed to the front thread portion 134. I have.

According to the first modification, the same effects as described above can be obtained, and the handling can be facilitated by dividing the transfer output shaft 72.

FIG. 6 shows a second modification of the first embodiment.

In the second modified example, in the transfer 22, as shown in FIG. 6, the front side of the base 78A of the driven sprocket 78 is extended to the center side step portion 88, and the base 78A of the driven sprocket 78 is extended.
The rear side of the driven sprocket 78 is extended to the screw portion 96, the front side of the base 78A of the driven sprocket 78, the rear side is the front side, and the front and rear output bearings 74 held by the rear transfer cases 44-1 and 44-2. It is supported by 76. The rear output bearing 76 is supported by the fastening nut 100 from the rear.

According to the second modification, the same effects as described above can be obtained, and the assembling property can be improved.

FIG. 7 shows a special structure of the present invention.
It shows an embodiment.

In the second embodiment, parts that perform the same functions as those in the first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, the side frame 4 is provided with the shaft holder 152 for holding the detached front propeller shaft 34. The shaft holder 152 has a locking portion 1 that is locked to the bottom 4A of the side frame 4 by the hole 4B.
54 and a holding portion 1 for holding the front propeller shaft 34
56 and the fixing bolt 15 on the upper 4C of the side frame 4.
8 and a fixing portion 160 fixed at 8.

According to the configuration of the second embodiment, when the front propeller shaft 34 is removed, the front propeller shaft 34 can be attached to the side frame 4 by the shaft holder 152, and the front propeller shaft 34 Can be easily handled. Further, the shaft holder 152 is connected to the bottom 4 of the side frame 4.
The front propeller shaft 34 can be firmly held because the front propeller shaft 34 is fixed to the upper portion 4C of the side frame 4 with the fixing bolt 158.

[0047]

As is apparent from the above detailed description, according to the present invention, in a full-time four-wheel drive vehicle, the propeller shaft is attached to the transfer output shaft so as to be detachable from the transfer output shaft. By providing a flange joint mechanism provided with a flange and providing a seal member for sealing between the transfer case and the transfer output shaft, the propeller shaft is detachably attached to the transfer output shaft by the flange joint mechanism. Even without a two-wheel / four-wheel switching mechanism, during vehicle inspection or towing, the propeller shaft can be removed to enable two-wheel drive, thereby reducing the number of parts and assembling man-hours, and reducing costs. In addition, the seal between the transfer case and the transfer output shaft is sealed by the seal member. Be excluded bets may prevent the oil in transfer flows out.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flange joint mechanism.

FIG. 2 is a sectional view of a transmission and a transfer.

FIG. 3 is a partial cross-sectional view of a transfer.

FIG. 4 is a schematic view of a vehicle.

FIG. 5 is a partial cross-sectional view of a transfer according to a first modification of the first embodiment.

FIG. 6 is a partial cross-sectional view of a transfer according to a second modification of the first embodiment.

FIG. 7 is a front view of a side frame to which a shaft holder according to a second embodiment is attached.

FIG. 8 is a sectional view of a conventional part-time transmission and transfer.

FIG. 9 is a cross-sectional view of a conventional full-time transmission and transfer.

FIG. 10 is a partial cross-sectional view of a conventional transfer.

[Explanation of symbols]

 2 Four-wheel drive vehicle 18 Engine 20 Transmission 22 Transfer 28 Flange joint mechanism 34 Front propeller shaft 72 Transfer output shaft 78 Driven sprocket 92 Output shaft side mounting flange 98 Seal member

Claims (4)

[Claims] 1. A transfer for constantly driving a vehicle in a four-wheel drive state is provided, and a transfer case of the transfer is provided for supporting a transfer output shaft on which a transfer sprocket is mounted, and a propeller shaft is connected to the transfer output shaft. In the transfer structure of an automobile, a flange joint mechanism provided with a mounting flange on the transfer output shaft is provided so that the propeller shaft can be detachably attached to the transfer output shaft, and the transfer case and the transfer output shaft are provided. A transfer structure for an automobile, characterized in that a seal member is provided for sealing between the two. 2. The transfer structure according to claim 1, wherein both ends of the transfer output shaft are supported by bearings held in the transfer case. 3. The transfer output shaft is of a two-split type, and includes a shaft supporting portion supported by a bearing held in the transfer case, and a flange portion spline-fitted to the shaft supporting portion. The transfer structure for an automobile according to claim 1, wherein 4. The transfer structure for an automobile according to claim 1, wherein said transfer output shaft is spline-fitted to said transfer sprocket which is supported by a bearing held by said transfer case.