JP3008248B2 - Transfer structure of four-wheel drive vehicle - Google Patents

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 vehicle in which front and rear wheels are driven by an engine mounted on a front part of a vehicle body, and more particularly to a transfer structure provided between a front differential gear and a rear differential gear.

[0002]

2. Description of the Related Art A transfer case of a conventional transfer is divided into two parts, a second transfer for supporting a transfer output shaft in the longitudinal direction of the vehicle at the rear of a first transfer case for supporting a transfer input shaft in the lateral direction of the vehicle. The case is connected, and the first transfer bevel gear provided at the left end of the transfer input shaft is meshed with the second transfer bevel gear provided at the front end of the transfer output shaft. Assembling of the first transfer bevel gear is performed through an opening formed in the left side surface of the first transfer case, and assembling of the second transfer bevel gear is performed using the second transfer bevel gear previously assembled.
This is performed by connecting the transfer case to the first transfer case.

[0003]

However, in the above conventional apparatus, the transfer case is divided into two parts, so that the number of parts increases and the manufacturing cost increases. In addition, the transfer case is divided into two parts after the transfer is assembled. Therefore, it is necessary to confirm the contact of the first transfer bevel gear and the second transfer bevel gear.

[0004] The present invention has been made in view of the above circumstances, and reduces the manufacturing cost of the transfer,
It is an object of the present invention to make it possible to easily check the contact of a transfer bevel gear and measure backlash.

[0005]

In order to achieve the above object, an invention according to claim 1 comprises a first transfer bevel gear provided on a transfer input shaft supported on a transfer case in a left-right direction of a vehicle body, and a transfer case. Meshes with a second transfer bevel gear provided on a transfer output shaft supported in the vehicle longitudinal direction,
In a transfer structure of a four-wheel drive vehicle, an opening through which a first transfer bevel gear can pass is formed on a side surface of a transfer case located on an extension of a transfer input shaft, and the opening is covered with a detachable side cover. , the front surface of the transfer case located on an extension of the transfer output shaft, the second transfer bevel gear to form an opening to pass therethrough, the opening of the front
Transfer output shaft to transfer case
The front opening is covered with a detachable front cover while being inserted and assembled .

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a tooth contact between the first transfer bevel gear and the second transfer bevel gear is provided between the second transfer bevel gear and the transfer case. It is characterized in that it is adjusted by the shim worn.

[0007]

According to the first aspect of the present invention, even if the transfer case is formed of one member, the transfer output shaft is inserted from the opening formed in the front surface of the transfer case to assemble the second transfer bevel gear. Also, the first transfer bevel gear can be assembled from an opening formed in the side surface of the transfer case. And
With these assembled, open the front of the transfer case.
Since the portions are open, it is possible to check the tooth contact of the first transfer bevel gear and the second transfer bevel gear and measure the backlash from the opening formed in the front surface of the transfer case.

According to the second aspect of the present invention, the contact between the first transfer bevel gear and the second transfer bevel gear is adjusted by the shim interposed between the second transfer bevel gear and the transfer case. A relatively low-cost one can be used.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 show an embodiment of the present invention. FIG. 1 is a schematic diagram of a power transmission system of a four-wheel drive vehicle, FIG. 2 is a skeleton diagram of a transmission, and FIG. 4 is a fragmentary enlarged view of FIG. 3, FIG. 5 is a view in the direction of arrow 5 in FIG. 4, FIG. 6 is a sectional view taken along line 6-6 of FIG. 4, and FIG.
FIG. 8 is a sectional view taken along line 7 in FIG.

As shown in FIG. 1, the engine E is mounted horizontally so that the crankshaft 1 faces the left and right direction of the vehicle body. A transmission for transmitting the driving force of the engine E to the left and right front wheels W _FL and W _FR and the left and right rear wheels W _RL and W _RR is connected to a torque converter 2 connected to a crankshaft 1 and to the torque converter 2. The transmission 3 includes a transmission 3, a front differential gear 4 connected to the transmission 3, a transfer 5 connected to the front differential gear 4, and a rear differential gear 6 connected to the transfer 5.

The front differential gear 4 is connected to left and right front wheels W via a front left axle 7 _L and a front right axle 7 _R.
Connected to _FL and W _FR . A rear differential gear 6 connected to the transfer 5 via a propeller shaft 8 is connected to left and right rear wheels W _RL , W _RR via a rear left axle 9 _L and a rear right axle 9 _R.

As is apparent from FIG. 3, a torque converter case 12, a transmission case 13, and a transmission case cover 14 are sequentially coupled to a right side surface of a crankcase 11 of the engine E, and a rear left side surface of the torque converter case 12 is provided. Is transferred to the transfer case 15. The transfer case 15 is a front cover 16
And a side cover 17. The front cover 16 covers an opening on the front surface of the transfer case 15, and the side cover 17 covers an opening on the left side of the transfer case 15.

Next, the structure of the transmission 3 will be described with reference to FIGS.

The transmission 3 housed inside the transmission case 13 includes a main shaft MS, a secondary shaft SS, and a counter shaft CS which are arranged in parallel with each other and extend in the left-right direction of the vehicle body.

A main drive gear 21 is fixed to the main shaft MS, and a main third speed gear 22 which can be coupled to the main shaft MS by a third speed clutch C _3.
And a main fourth-speed gear 23 integrally formed and connectable to the main shaft MS by a fourth-speed reverse clutch C _4R.
And the main reverse gear 24 are rotatably supported.

[0017] to the secondary shaft SS, together with the secondary driven gear 25 is fixed, the secondary first speed gear 26 can be coupled to the secondary shaft SS by the first speed clutch C _1, coupled to the secondary shaft SS by the second clutch C ₂ A possible secondary second gear 27 is rotatably supported.

A counter second gear 28, a counter third gear 29, and a final drive gear 30 are fixedly mounted on the counter shaft CS, and a counter idle gear 31, a counter fourth gear 32, and a counter reverse gear 33 are provided. A counter first gear 34 that is rotatably supported and can be coupled to the counter shaft CS via a first-speed hold clutch C _LH is rotatably supported. A reverse idle gear 35 meshes with the main reverse gear 24 and the counter reverse gear 33. Counter 1st gear 34
_{Can be connected} to the counter third gear 29 via a one-way clutch _COW , and the counter fourth gear 32 and the counter reverse gear 33 can be selectively connected to the counter shaft CS via a selector 36.

The main drive gear 21 meshes with the counter idle gear 31, and the counter idle gear 31 meshes with the secondary driven gear 25. The rotation of the crankshaft 1 of the engine E is controlled by the torque converter 2, the main shaft MS, and the main drive gear. 21, to the secondary shaft SS via the counter idle gear 31 and the secondary driven gear 25.

Accordingly, the secondary first speed gear 26 rotatably supported by the secondary shaft SS is connected to the first speed clutch C
_{When the} secondary shaft SS is connected to the secondary shaft SS at ₁ , the rotation of the secondary shaft SS becomes the first speed clutch C ₁ and the secondary 1
The transmission is transmitted to the counter shaft CS via the speed gear 26, the one-way clutch _COW and the counter third speed gear 29, and the first speed is established. Incidentally, the first speed clutch C ₁ is held in the engaged state even when establishing a second speed to fourth speed shift stage, at the time of the second speed to fourth speed gear establish the one-way clutch C _OW is slipped.

[0021] Upon binding to the secondary shaft SS in the secondary second gear 27 rotatably supported on the secondary shaft SS second clutch C _2, the rotation the second clutch C ₂ of the secondary shaft SS, secondary second gear 2
The gear is transmitted to the counter shaft CS via the seventh gear and the counter second speed gear 28, and the second speed is established.

[0022] When coupled to the main shaft MS by a main third-speed gear 22 rotatably supported on the main shaft MS third speed clutch C _3, the rotation of the main shaft MS is the third speed clutch C _3, a main third-speed gear 22 and the counter The signal is transmitted to the counter shaft CS via the third speed gear 29, and the third speed is established.

The counter shaft CS is rotatably supported on the counter shaft CS.
Counter 4th gear 32 held by the selector 36
When connected to the shaft CS, the main shaft MS
4th speed-reversed main 4th gear 23 rotatably supported
Scratch C_4RWhen coupled to the main shaft MS with
4th speed rotation of in-shaft MS-reverse clutch
C _4R, Main fourth gear 23, counter fourth gear 32,
Transmitted to the counter shaft CS via the selector 36.
The fourth gear is established.

While the counter reverse gear 33 rotatably supported on the counter shaft CS is connected to the counter shaft CS by the selector 36, the main reverse gear 24 rotatably supported on the main shaft MS is connected to the fourth speed-reverse clutch C. _{When the} main shaft MS is coupled to the main shaft MS by the _4R , the rotation of the main shaft MS becomes the fourth speed-reverse clutch _C4R , the main reverse gear 24, the reverse idle gear 35, the counter reverse gear 33, and the selector 36.
To the counter shaft CS, and the reverse gear is established.

When the first-speed hold clutch C _LH is engaged with the first-speed clutch C ₁ engaged, the first-speed hold shift speed is established. Establishing the 1st-speed hold gear when strong engine braking is required allows the one-way clutch C
_{Even if the OW} slips, the torque of the rear wheels W _RL and W _RR can be transmitted back to the engine E via the first-speed hold clutch C _LH .

Next, the structure of the front differential gear 4 will be described with reference to FIGS.

The front differential gear 4 housed in the rear part of the torque converter case 12 and the transmission case 13 includes a tapered roller bearing 41 provided in the torque converter case 12 and a transmission case 13.
And a differential case 43 rotatably supported by a tapered roller bearing 42 provided in the case. On the outer periphery of the differential case 43, a final driven gear 44 that meshes with the final drive gear 30 provided on the counter shaft CS, and a transfer drive gear 45 that transmits power to the transfer 5,
They are fastened together by a plurality of bolts 46.

The rotation of the counter shaft CS of the transmission 3 is transmitted to the differential case 43 via the final drive gear 30 and the final driven gear 44, and the rotation of the differential case 43 is transmitted to the left and right front wheels W _FL and W _FR . It is transmitted to the front left axle 7 _L and the front right axle 7 _R in accordance with the load.

A front left output shaft 47 connected to the front left axle 7 _L
And _L, relatively rotatably fitted to the front right output shaft 47 _R and the differential case 43 connecting to the front right axle 7 _R, both the output shafts 47 _L, 47 _R respectively differential side gears on opposite ends of the 48 Are spline-connected. A spring pin 4 is inserted in the differential case 43 so as to be orthogonal to the output shafts 47 _L and 47 _R.
A pair of differential pinion gears 51, 51 meshing with the two differential side gears 48, 48, respectively, are supported on the pinion shaft 50 fixed at 9.

Next, the structure of the transfer 5 will be described with reference to FIGS.

[0031] The rear portion of the torque converter case 12 and the supporting hole 12 ₁ for supporting the transfer case 15 is formed in the lateral direction, the supporting portion 15 ₁ projecting from the supporting hole 12 ₁ in the right side surface of the transfer case 15 Are fitted and fixed with four bolts 52. Front cover 16 covering the opening portion 15 ₂ formed on the front surface of the transfer case 15 is fixed by four bolts 53 ..., it covers the opening 15 ₃ formed on the left side surface of the transfer case 15 side The cover 17 has five bolts 54
Fixed by ...

The transfer input shaft 55, which is supported inside the transfer case 15 in the left-right direction of the vehicle, is integrally provided with a transfer driven gear 56 meshing with the transfer drive gear 45 at the right end thereof, and a first transfer bevel gear 57 at the left end thereof. Are fixed with nuts 58. The transfer input shaft 55 is
While being supported by the roller bearing 59 provided in the support portion 15 ₁ of the transfer case 15 in the left side of the transfer driven gear 56 is supported by the tapered roller bearing 60 provided in the support portion 15 ₁ of the transfer case 15 at its intermediate portion, Further, it is supported by a tapered roller bearing 61 provided between the first transfer bevel gear 57 and the side cover 17 at the left end.

The transfer input shaft 55 has two tapes.
Positioned in the axial direction by roller rollers 60 and 61
Is That is, the transfer input shaft 55
The thrust force is applied to the step 55 of the transfer input shaft 55.₁
To tapered roller bearing 60, distance collar
62, shim 63, first transfer bevel gear 57,
Side portion via tapered roller bearing 61 and shim 64
Step 17 of cover 17 ₁Will be accepted. Also Transf
The rightward thrust force of the input shaft 55 is
Washer 65, first transfer bevel gear 57,
63, distance collar 62 and tapered roller bearer
Step 1 of the transfer case 15 via the ring 60
5_FourWill be accepted. At this time, a pair of tapered roller
The set load of the rings 60 and 61 is shim 63 and shim 64
Is adjusted by the thickness of the.

The transfer output shaft 66, which is supported inside the transfer case 15 in the front-rear direction of the vehicle body, integrally has a second transfer bevel gear 67 meshing with the first transfer bevel gear 57 at a front end thereof, and a coupling at a rear end thereof. 68 are spline-fitted and fixed with nuts 69. Transfer output shaft 6
6 is supported by a tapered roller bearing 70 provided on the transfer case 15 at a front portion thereof, and is supported by a tapered roller bearing 71 provided on the transfer case 15 at a rear portion thereof.

The thrust force of the backward transfer output shaft 66, the second transfer bevel gear 67 via a shim 72 and the tapered roller bearing 70 is the receiving step portion 15 ₅ of the transfer case 15, the thrust force of the forward, the nut 69 the washer 73, is the receiving the stepped portion 15 ₆ of the transfer case 15 via the coupling 68 and the tapered roller bearing 71. The set load of the pair of tapered roller bearings 70 and 71 is performed by adjusting the amount of tightening of the nut 69. The tooth contact between the first transfer bevel gear 57 and the second transfer bevel gear 67 is changed by changing the thickness of the shim 72 interposed between the second transfer bevel gear 67 and the tapered roller bearing 70.
The adjustment is performed by adjusting the position 7 in the front-back direction.

The transfer 5 is assembled in advance as a sub-assembly, and the torque converter case 12
Assembled in The assembly of the transfer 5 is performed in the following procedure. First, the front cover 16 and the side cover 17
While removal of the added a preload to the tapered roller bearing 70 from the front of the opening 15 ₂ in the transfer case 15 by inserting a standard dummy transfer output shaft 66. Wherein in this state by inserting the measurement instruments through the opening 15 _2, by measuring the distance to the front end surface of the inner race shaft center tapered roller bearing 70 of the transfer input shaft 55, the second transfer bevel gear 6
7 to be interposed between taper roller bearing 70 and taper roller bearing 70
Set the thickness of 2. A plurality of shims 72 having different thicknesses are prepared at intervals of 30 microns, and a shim having a predetermined thickness is selected therefrom.

Subsequently, the standard dummy of the transfer output shaft 66 is removed, the selected shim 72 is mounted on the actual transfer output shaft 66 and inserted into the transfer case 15, and the coupling 68 is spline-fitted to the rear end. By fixing with the washer 73 and the nut 69, the assembling of the transfer output shaft 66 is completed.

Next, while supporting the a transfer driven gear 56 from the support portion 15 ₁ side by inserting the transfer input shaft 55 integrally provided with the roller bearing 59 and the tapered roller bearing 60 of the transfer case 15, the left side of the transfer case 15 distance collar 62 from the opening 15 the _third surface to the transfer output shaft 65, the shim 63, the first transfer bevel gear 5
7 is fixed with the washer 65 and the nut 58, and the side cover 17 is further mounted via the tapered roller bearing 61 and the shim 64, thereby completing the assembly of the transfer input shaft 65.

In this state, in front of the transfer case 15
Surface opening 15_TwoIs open for transfer
The opening can be formed without forming a special window in the case 15.
Fifteen _TwoFrom the first transfer bevel gear 57 and the second
Check the contact of the transfer bevel gear 67 with the tooth
Crash measurements can be made. Thus, Tran
Opening 15 at the front of spur case 15_TwoTo front cover
16 is attached, the sub-
The assembly is completed.

[0040] Transfer 5 completed as described above, the torque converter case 12 and the support part 15 ₁
In a state where the support hole 12 fitted sealingly abutted to _1, four bolts 5
Fixed at 2. By making the transfer 5 into a sub-assembly, the number of assembly steps in the main assembly line can be reduced.

As is apparent from FIG. 4, a transfer driven gear 56 provided at the right end of a transfer input shaft 55 that is cantilevered by the transfer case 15 and extends rightward is a final driven gear 44 provided on the outer periphery of the differential case 43. It is arranged on the left side of the rotation plane of. Therefore, even if the diameter of the final driven gear 44 is increased,
Does not interfere with the transfer input shaft 55, and the final drive gear 30 and the final driven gear 4
4 can be arbitrarily set. Further, since it is not necessary to reduce the diameter of the transfer input shaft 55 in order to avoid interference with the final driven gear 44, the capacity of the bearing supporting the transfer input shaft 55 can be sufficiently ensured.

Next, the operation structure of the transmission arm of the transmission 3 will be described with reference to FIGS.

On the left side of the torque converter case 12,
A speed change arm 82 is pivotally supported via a speed change shaft 81. The shift arm 82 is connected to a select lever 94 (see FIG. 6) provided in the vehicle cabin via a push-pull cable 83, and the shift shaft 81 is connected to the torque converter case 1.
2 and is connected to a manual valve (not shown) provided in a hydraulic control device inside the transmission 3.

The push-pull cable 83 includes an outer tube 84 and an inner cable 85, and the distal end of the outer tube 84 is connected to a connecting collar 87 by a joint 86. Coupling collar 87 is integrally provided with ₂ large-diameter body portion 87 ₁ and a small-diameter male screw portion 87, the outer tube 84 is supported on the torque converter case 12 by a nut 88 screwed to the male screw portion 87 ₁ .

[0045] That is, the lower surface of the support hole 12 ₁ of the torque converter case 12 notch extending in the longitudinal direction of the vehicle body 12 ₂
There are formed, the mounting bracket 89 so as to face the rear end of the notch 12 ₂ is fixed by two bolts 90, 90. The mounting bracket 89 is provided with a U-shaped notch 89 ₁ that opens upward, and the male screw portion 87 ₂ of the connecting collar 87 is fitted into the notch 89 ₁ to thereby form a nut 88.
Screw. Thereby, the main body part 87 of the connecting collar 87
The edge of the notch 89 ₁ of the mounting bracket 89 is clamped by the nut ₁ and the nut 88, and the outer tube 84 of the push-pull cable 83 is fixed to the mounting bracket 89.

Support hole 12 of torque converter case 12
₁Support portion 15 of transfer case 15₁
The notch 12_TwoUpward recess corresponding to
Fifteen ₇Is formed. The recess 15₇Is the transfer
A roller bearing 59 for supporting the input shaft 55 and a tape
Between the roller bearings 60, the support portions 15₁Under
Surface facing up to position close to transfer input shaft 55
The push-pull cable
83 are accommodated.

The distal end of the inner cable 85 slidably fitted in the outer tube 84 penetrates through the joint 86 and the connecting collar 87, and the inside of the flexible boot 91 supported by the male screw portion 87 _2. To the rod 92. The tip of a rod 92 extending from the boot 91 is connected to the shift arm 82 via a joint 93.

As described above, the push-pull cable 8
3 is formed on the lower surface of the transfer case 15
Since housed in 5 _7, without bypassing the lower surface of the transfer case 15 by connecting the select lever 94 and the shift arm 82 by a complex link mechanism, sufficient ground clearance by increasing the position of the push-pull cable 83 Can be secured. When the transfer 5, the propeller shaft 8, and the rear differential gear 6 are removed from the four-wheel drive vehicle of this embodiment to form a two-wheel drive vehicle, the push-pull cable 83 is connected between the four-wheel drive vehicle and the two-wheel drive vehicle. The handling is the same, and the manufacturing cost can be reduced.

Although the embodiments of the present invention have been described in detail, various design changes can be made without departing from the gist of the present invention.

[0050]

As is evident from the foregoing description, according to the invention described in claim 1, in front of the transfer case located on an extension of the transfer output shaft to form an opening in which the second transfer bevel gear may pass , Open this front
Transfer case for transfer output shaft from mouth
And the front opening is covered with a detachable front cover, so that the first and second transfer bevel gears can be used even if the transfer case is made of one member and the manufacturing cost is reduced. Can be assembled without hindrance. Further, since the meshing portion between the two transfer bevel gears is visible through the opening on the front surface of the transfer case, it is possible to check the tooth contact and measure the backlash without forming a special window.

According to the second aspect of the present invention,
Since the tooth contact between the first transfer bevel gear and the second transfer bevel gear is adjusted by the shim interposed between the second transfer bevel gear and the transfer case, the shim is interposed between the two transfer cases to reduce the tooth contact. As compared with the adjusting shim, the shim having a small size and a simple shape can be used.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a power transmission system of a four-wheel drive vehicle.

FIG. 2 is a skeleton diagram of a transmission;

FIG. 3 is a partially broken plan view of the transmission;

FIG. 4 is an enlarged view of a main part of FIG. 3;

FIG. 5 is a view in the direction of arrows in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

FIG. 7 is a sectional view taken along line 7-7 of FIG. 6;

FIG. 8 is a view in the direction of arrows in FIG. 6;

[Explanation of symbols]

15 Transfer Case 15 ₂ Opening 15 ₃ Opening 16 Front Cover 17 Side Cover 55 Transfer Input Shaft 57 First Transfer Bevel Gear 66 Transfer Output Shaft 67 Second Transfer Bevel Gear 72 Shim

Claims (2)

(57) [Claims] 1. A first transfer bevel gear (57) provided on a transfer input shaft (55) supported on a transfer case (15) in the left-right direction of the vehicle body, and a transfer output shaft supported on the transfer case (15) in a vehicle front-rear direction. The second transfer bevel gear (67) is meshed with the second transfer bevel gear (67) provided on the side of the transfer case (15) located on the extension of the transfer input shaft (55).
In a transfer structure of a four-wheel drive vehicle in which an opening (15 ₃ ) through which 7) can pass is formed, and this opening (15 ₃ ) is covered with a detachable side cover (17), a transfer output shaft ( opening the front, which can pass through the second transfer bevel gear (67) of the transfer case (15) located on an extension of 66) (15 ₂₎
Is formed, and the transfer is made from the opening (15 ₂ ) on the front side.
Transfer shaft (66) to transfer case (15)
A transfer structure for a four-wheel drive vehicle, characterized in that the front opening (15 ₂ ) is covered with a detachable front cover (16) while being inserted and assembled . 2. A first transfer bevel gear (57).
The tooth contact between the second transfer bevel gear (67) and the second transfer bevel gear (67) is adjusted by a shim (72) interposed between the second transfer bevel gear (67) and the transfer case (15). A transfer structure for a four-wheel drive vehicle as described in the above.