JPH0650141B2 - Transmission shaft support device for automatic transmission for four-wheel drive - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transmission shaft support device for a four-wheel drive automatic transmission having a four-wheel drive transfer.

(Prior Art) Conventionally, an automatic transmission has an input shaft, an output shaft, a transmission shaft such as an intermediate transmission shaft arranged between the input shaft and the output shaft, and a planetary gear transmission that connects the transmission shafts. A transmission such as a device, a transmission case accommodating the transmission shaft and the transmission, and an extension housing connected to the transmission case by bolting or the like, and the output shaft has two fulcrums of an intermediate portion and an output side end portion. In the above, each is rotatably supported by the rear end of the transmission case and the rear end of the extension housing (see Japanese Utility Model Publication No. 34-12809).

By the way, it is preferable to drive the vehicle by four-wheel drive in order to improve the exercise performance and the rough road running performance.

Therefore, for example, two wheels-4 on the output side of the conventional automatic transmission.
There is provided an automatic transmission for four-wheel drive in which a transfer having a wheel switching clutch and a reduction gear is arranged in series (see Japanese Patent Laid-Open No. 56-75220).

In this case, in the four-wheel drive automatic transmission, the conventional automatic transmission described above serves as a transmission, and the transfer is arranged on the output side of the transmission. Therefore, the output shaft of the transmission functions as another intermediate transmission shaft.

That is, on the output side of the input shaft, the first intermediate transmission shaft is
A second intermediate transmission shaft is provided on the output side of the intermediate transmission shaft, and an output shaft is provided on the output side of the second intermediate transmission shaft, the input shaft being the first intermediate transmission shaft, and the first intermediate transmission shaft. Is connected to the second intermediate transmission shaft via the transmission of the transmission, and the second intermediate transmission shaft is connected to the output shaft via the reduction gear of the transfer.

Further, a transmission case for accommodating the transmission and a transfer case for accommodating the transfer are arranged, and the transfer case is formed by an extension case, a front transmission mechanism case, a rear transmission mechanism case and an extension housing.

The second intermediate transmission shaft is normally supported at two fulcrums by the rear end of the transmission case at the intermediate part and by the input end of the output shaft at the output end. On the other hand, the output shaft is supported at two fulcrums by the input side end portion by the rear end portion of the front transmission mechanism case and the output side end portion by the rear end portion of the rear transmission mechanism case.

(Problems to be Solved by the Invention) However, in the above-described conventional transmission shaft support device for an automatic transmission for four-wheel drive, since the second intermediate transmission shaft is not supported at the input side end, the intermediate side to the input side are not supported. If the distance to the end is long, whirling occurs at the input end, and the whirling imposes a load on the transmission of the transmission case, and the durability of the components of the transmission deteriorates.

The output side end of the second intermediate transmission shaft is supported by the input side end of the output shaft, but the input side end of the output shaft is the front transmission mechanism case and the output side end is the rear transmission mechanism. Since it is supported by the case, it becomes difficult to secure the concentricity of the output shaft, and whirling easily occurs at the output side end of the second intermediate transmission shaft. If the bearing or the like wears at the fulcrum of the output side end of the second intermediate transmission shaft due to the whirling, the whirling generated at the output side end of the second intermediate transmission shaft becomes even larger.

The present invention solves the problems of the conventional transmission shaft support device for a four-wheel drive automatic transmission and prevents whirling from occurring at the input side end of the second intermediate transmission shaft. The durability of the components of the transmission is improved, and when the bearing or the like is worn at the fulcrum of the output side end of the second intermediate transmission shaft, it occurs at the output side end of the second intermediate transmission shaft. An object of the present invention is to provide a transmission shaft support device for a four-wheel drive automatic transmission that can prevent the whirling of the vehicle from increasing.

(Means for Solving the Problems) Therefore, in the transmission shaft supporting device of the automatic transmission for four-wheel drive according to the present invention, the transmission case and the transfer case connected to the rear end portion of the transmission case are provided. Have.

The transmission case accommodates the first and second transmissions, and the transfer case accommodates the third transmission.

Further, an input shaft for transmitting the driving force from the engine to the first transmission device and a coaxial arrangement with the input shaft are provided, and the driving force from the first transmission device is transmitted to the second transmission device. A first intermediate transmission shaft for transmission, and a second intermediate transmission shaft arranged coaxially with the first intermediate transmission shaft for transmitting the driving force from the second transmission device to the third transmission device, And an output shaft which is disposed coaxially with the second intermediate transmission shaft and which transmits the driving force from the third transmission to the wheels.

Further, first supporting means for rotatably supporting the input side end of the second intermediate transmission shaft on the transmission case, and rotatably supporting the output side end of the second intermediate transmission shaft on the transfer case. And a third support means for rotatably supporting the intermediate portion of the second intermediate transmission shaft between the transmission case and the first support means and the second support means. Between the third support means and the second support means, there is provided fourth support means for rotatably supporting the second intermediate transmission shaft on the transfer case.

The amount of play in the third support means is set larger than the amount of play in the first and second support means, and the amount of play in the fourth support means is greater than the amount of play in the third support means. Is also set large.

(Operation and Effect of the Invention) In the present invention, the transmission shaft support device of the automatic transmission for four-wheel drive has a transmission case and a transfer case connected to the rear end of the transmission case.

The transmission case accommodates the first and second transmissions, and the transfer case accommodates the third transmission.

Further, an input shaft for transmitting the driving force from the engine to the first transmission device and a coaxial arrangement with the input shaft are provided, and the driving force from the first transmission device is transmitted to the second transmission device. A first intermediate transmission shaft for transmission, and a second intermediate transmission shaft arranged coaxially with the first intermediate transmission shaft for transmitting the driving force from the second transmission device to the third transmission device, And an output shaft which is disposed coaxially with the second intermediate transmission shaft and which transmits the driving force from the third transmission to the wheels.

Therefore, the driving force from the engine is transmitted to the first transmission through the input shaft, and the driving force of the first transmission is transmitted to the second transmission through the first intermediate transmission shaft.
The driving force from the second transmission is transmitted to the third transmission via the second intermediate transmission shaft, and the driving force from the third transmission is transmitted to the wheels via the output shaft. It

Further, first supporting means for rotatably supporting the input side end of the second intermediate transmission shaft on the transmission case, and rotatably supporting the output side end of the second intermediate transmission shaft on the transfer case. And a third support means for rotatably supporting the intermediate portion of the second intermediate transmission shaft between the transmission case and the first support means and the second support means. Between the third support means and the second support means, there is provided fourth support means for rotatably supporting the second intermediate transmission shaft on the transfer case.

The amount of play in the third support means is set larger than the amount of play in the first and second support means, and the amount of play in the fourth support means is greater than the amount of play in the third support means. Is also set large.

Thus, both ends of the second intermediate transmission shaft are supported by the first and second supporting means, and the intermediate portion is supported by the third supporting means, and the play amount in the third supporting means is first,
It is set to be larger than the play amount in the second support means.

Therefore, during normal traveling, the second intermediate transmission shaft can be supported by the two fulcrums by the first and second supporting means, but when the intermediate portion of the second intermediate transmission shaft is bent during high speed traveling, The second intermediate transmission shaft can be supported at three fulcrums by the first, second, and third supporting means.

As a result, whirling can be prevented from occurring at the input side end of the second intermediate transmission shaft, and the durability of the components of the transmission can be improved.

Further, the second intermediate transmission shaft is supported by the fourth supporting means between the third supporting means and the second supporting means, and the play amount in the fourth supporting means is the third supporting means. Is set to be larger than the play amount in.

Therefore, since the second intermediate transmission shaft is supported by the fourth supporting means, even if the bearing or the like is worn at the fulcrum of the output side end of the second intermediate transmission shaft,
It is possible to prevent the whirling generated at the output end of the intermediate transmission shaft from increasing.

(Example) Hereinafter, the Example of this invention is described in detail, referring drawings.

The automatic transmission 100 includes a torque converter 200 that is a fluid transmission device, a transmission 300 that is a main transmission, a hydraulic control device 400, a four-wheel drive transfer 500 that is a four-wheel drive auxiliary transmission, and a transfer control. Comprised of a device 600.

Transmission 300 is the first planetary gear set p
1, one multi-disc clutch C operated by hydraulic servo
0, one multi-plate brake B0, and one one-way clutch F0, an overdrive planetary gear transmission OD as a first transmission, a second planetary gear set p2, a third planetary gear set p3, and a hydraulic servo. Three multi-plate clutches C1 and C2, one belt brake B1, two multi-plate brakes B2 and B3, and two one-way clutches F1 and F2 which are operated by It is composed of a one-stage underdrive planetary gear transmission UD.

A case 110 of the automatic transmission includes a torque converter housing 120 that houses a torque converter 200, a transmission case 13 that houses an overdrive planetary gear transmission OD and an underdrive planetary gear transmission UD.
0, a transfer case 140 fastened to the rear side of the automatic transmission 100, and the torque converter housing 1
20, the transmission case 130, and the transfer case 140 are fastened with a large number of bolts.

The transfer case 140 includes an extension case 144 provided with an input shaft chamber 141, a speed change mechanism chamber 142 and a two-wheel / four-wheel switching mechanism chamber 143 from the front, a front transmission mechanism case 1466 and a rear transmission mechanism forming a transmission mechanism chamber 145. Case 147
And an extension housing 148 which forms an output shaft chamber 149 and is a rear lid of the transfer case 140.

The torque converter 200 is housed in a torque converter chamber 121 whose front side (engine side) of the torque converter housing 120 is open, and is connected to an engine output shaft by a front cover 111, and an annular ring welded to the outer periphery of the front cover 111. A plate-shaped rear cover 112, a pump impeller 205 provided around the inner wall of the inner wall surface of the rear cover 112, a turbine runner 206 arranged to face the pump impeller 205, and a turbine shell holding the turbine runner 206. 207,
A stator 201 supported by a fixed shaft (stator shaft) 203 via a one-way clutch 202, and a direct coupling clutch (lock-up clutch) 113 that directly couples the front cover 111 and the turbine shell 207.

An oil pump 150 is housed in a recess formed in the rear surface between the torque converter chamber 121 and a tubular transmission chamber 132 that is provided in the transmission case and that is continuous to the rear of the transmission case. An annular plate-shaped oil pump body 151 having a cylindrical portion 152 protruding in the center of the transmission case 130 is fitted to the front end of the transmission case 130 and is centrally positioned and fastened with a bolt. An oil pump cover 154 having a cylindrical front support 153 coaxial with the cylindrical portion 152 and protruding rearward is fastened. The oil pump body 151 and the oil pump cover 154 constitute an oil pump housing 155, which is a partition wall between the torque converter chamber 121 and the transmission chamber 132 and a front support wall of the transmission case 130. Further, an intermediate support wall 159 is formed in the middle of the transmission chamber 132 so as to separate the overdrive mechanism chamber 133 and the underdrive mechanism chamber 134 and to have a cylindrical center support 158 protruding rearward. It is fitted. A rear support wall 157 having a cylindrical rear support 156 protruding forward is provided integrally with the transmission case 130 at a rear portion of the transmission case 130, and a transmission chamber 132 is formed between the transmission case 130 and the partition wall 155. There is.

In the extension case 144 fitted and fastened to the outer surface of the rear supporting wall 157 of the transmission case, the outer case of the rear supporting wall 157 is fitted between the input shaft chamber 141 and the transmission mechanism chamber 142. In the extension case 144 that is fastened and fastened, the input shaft chamber 141 and the transmission mechanism chamber are
142 between the center support 156 of the rear support wall 157.
And a transfer front support wall 162 having a cylindrical transfer front support 161 having a coaxial center with
Are fastened to the extension case 144 with bolts. In addition, the transmission mechanism room 142 and the two-wheel / four-wheel switching mechanism room 1
A cylinder 164 of the brake B4, which is coaxial with the transfer front support 161, and has a cylindrical transfer center support 163 projecting rearward, is formed between and 43 and is fitted therein. Further, a front transmission mechanism case 146 and a rear transmission mechanism case 147 are integrally formed between the two-wheel / four-wheel switching mechanism chamber 143 and the transmission mechanism chamber 145 and between the transmission mechanism chamber 145 and the output shaft chamber 149. Formed on the tubular portion 16
Transfer intermediate support walls 167, 168 having 5, 166 are provided. Further, the front support 15 is provided on the rear end portion 140A.
A sleeve yoke 10 connected to a propeller shaft (not shown) of the vehicle so as to have a coaxial center with 3 is inserted and is rotatably supported via a ball bearing b1.

Inside the fixed shaft 203 inside the front support 153, the input shaft 11 of the transmission, which is the output shaft of the torque converter 200, is rotatably supported by the oil pump housing 155 at two front and rear fulcrums via bushes m1 and m2. . The input shaft 11 has a flange portion 12a behind the front support 153 and has a center hole 1 which is rearward in the axial center.
It has a rear end large diameter portion 12 in which 3 is formed. Behind the input shaft 11, the tip is inserted into the center hole 13 and the bush is inserted.
It is rotatably supported by the input shaft 11 via m4, the middle is rotatably supported by the center support 158 of the intermediate support wall 159 via the roller bearing r1, and the rear end is centered on the tip of the second intermediate transmission shaft 1. An overdrive planetary gear transmission O having a large-diameter portion formed with a rearward facing center hole 16 that makes sliding contact.
Underdrive planetary gear transmission U which is the output shaft of D
A first intermediate transmission shaft 14 which is an input shaft of D is arranged coaxially with the input shaft 11 in series. In addition, center support 15
8, the intermediate supporting wall 159 and the bush m4 constitute a first supporting means.

The second intermediate transmission shaft 1 which is a transmission shaft to which the transmission shaft support device for an automatic transmission for four-wheel drive according to the present invention is applied has a tip portion 1A whose input end is the first intermediate transmission shaft 14 which is the input end. Center hole
16 and is rotatably supported on the inner peripheral wall of the hole 16 via a bush m4. In this embodiment, the first intermediate transmission shaft 14 is further rotated by the center support 159 via the roller bearing r1. By being supported freely,
The transmission case 130 is rotatably supported. In the intermediate portion 1B, in the present embodiment, the ring gear that meshes with the ring gear R2 of the third planetary gear set p3 on the outer circumference and has a sleeve-like boss portion 2B that is a cylindrical shaft support portion protruding rearward in the center portion. The flange 2 is spline-fitted, and the sleeve-like boss portion 2B is a bush.
It is rotatably supported by the transmission case 130 by being rotatably supported by the rear support 156 via m5, and further, the intermediate portion 1B inserted into the transfer case 140 is the transfer front through the bush m6. By being rotatably supported by the support 161, it is rotatably supported by the transfer case 140,
The outer periphery is spline-fitted with the sun gear 544 of the planetary gear set pf. Rear end 1C where output is round end
Is a large-diameter portion 3B having a forward-facing center hole 3a formed at the input end portion 3A of the first output shaft 3 of the transfer 500 whose tip will be described later.
Is rotatably supported by the first output shaft 3 through the bush m8 and is also inserted into the first output shaft 3 and the bush m7.
It is rotatably supported by the transfer case 140 by being rotatably supported by the transfer center support 163 via. The first output shaft 3 is arranged coaxially with the second intermediate transmission shaft 1 in series, and has a central hole 3a which is in sliding contact with the rear end portion 1C of the second intermediate transmission shaft 1 at the input end portion 3A. It has a large diameter portion 3b, the large diameter portion 3b is connected to the carrier 547 of the planetary gear set pf by welding, and is rotatably supported by the transfer center support 163 via the bush m7, so that the transfer case 140 is supported. It is rotatably supported. The transfer center support 163, the cylinder 164 of the brake B4, and the bushes m7 and m8 form a second support means. In the present embodiment, the intermediate portion 3C is spline-fitted to the cylinder 543 of the clutch C4 on the outer circumference, and the output end portion 3B is spline-fitted to the sleeve yoke 10, and the sleeve yoke 10 is inserted through the ball bearing b1. Is rotatably supported at the rear end of the extension housing 148. In this way, by inserting the tip 1A of the second intermediate transmission shaft 1 into the center hole 16 of the first intermediate transmission shaft 14 and supporting it on the transmission case 130 via the intermediate supporting wall 158, the tip of the second intermediate transmission shaft 1 is formed. It is possible to reliably prevent the shake due to the rotation of the portion 1A.

Underdrive planetary gear transmission UD as in this embodiment
A center hole 16 is provided at the rear end of the first intermediate transmission shaft 14 which is the input shaft of the second intermediate transmission shaft 1, and the tip 1A of the second intermediate transmission shaft 1 is inserted and supported.
Further, by providing a center hole 3a at the tip of the first output shaft 3 and inserting and supporting the rear end 1C of the second intermediate transmission shaft 1,
The axial dimension of the entire transmission shaft can be shortened.

In each of the support portions of the front end portion 1A, the middle portion 1B and the rear end portion 1C of the second intermediate transmission shaft 1, the front end portion 1A and the rear end portion 1 are provided.
The play amounts S1 and S2 with the center support 159 and the transfer center support 163 of the transmission case in C are both set to the same degree, and the play amount S3 between the intermediate portion 1B and the rear support 156 is 2 above the play amounts S1 and S2. It is set to double or more and four times or less. As a result, the second intermediate transmission shaft 1 is rotatably supported by the two fulcrums at the front end portion 1A and the rear end portion 1C during normal traveling transmission. When the rotational balance becomes uneven, for example, when the frictional force of the multi-plate brake is partially strong in the circumferential direction, the intermediate portion 1B of the second intermediate transmission shaft 1 bends to cause whirling. When the whirling becomes a predetermined size, the intermediate portion 1B is supported by the rear support 156 of the rear supporting wall 157 via the boss portion 2B of the ring gear flange 2 and the bush m5, and the whirling is prevented from increasing. The rear support 156, the rear support wall 157, the boss portion 2B and the bush m5 constitute a third support means. In addition, the amount of play S3 between the intermediate portion 1B of the second intermediate transmission shaft 1 and the rear support 156 is increased, and the spline fitting between the outer periphery of the second intermediate transmission shaft 1 and the sleeve-like boss portion 2B is performed. When the play amount S4 due to the combination, the play amount S5 between the sleeve-shaped boss portion 2B via the bush m5 and the rear support 156 are substantially evenly distributed, the following effect can be obtained.

(A) The play amounts S4 and S5 can be increased to prevent the ring gear flange 2 from being twisted during assembly, and the assembling property of the ring gear flange is improved.

(B) By providing the play due to the play amount S4 between the second intermediate transmission shaft 1 and the boss portion 2B of the ring gear flange 2, the flange 2 floats with respect to the second intermediate transmission shaft 1,
Thrust bearing life is increased.

Further, the play amount S6 between the intermediate portion 1B and the transfer front support 161 of the transfer front support wall 162 is
It is set to be larger than the play amount S3 between B and the rear support 156, and only when the bush m5 or bush m8 wears
The intermediate portion 1B of the intermediate transmission shaft 1 is supported by the transfer front support 161 via the bush m6. The transfer front support 161, the transfer front support wall 162, and the bush m6 constitute a fourth supporting means.

In the overdrive mechanism chamber 133, a first planetary gear set p1 is provided on the rear side of the input shaft 11, its ring gear R0 is coupled to the first intermediate transmission shaft 14 via a flange plate 22, and the planetary carrier P0 is The sun gear S0 is connected to the flange portion 12a of the input shaft 11, and the sun gear S0
Formed in 3. On the front side of the first planetary gear set p1, a first hydraulic servo drum 24 that opens rearward is fixed to the inner race shaft 23, and its outer peripheral wall and the inner race shaft
An annular piston 25 is fitted between 23 to form a hydraulic servo C-0 of the clutch C0, a return spring 26 is provided on the inner race shaft 23 side, and a clutch C0 is provided inside the outer peripheral wall.
Is mounted and is connected to the carrier P0 via the clutch C0. A one-way clutch F0 having an inner race shaft 23 as an inner race is provided on the inner circumference of the first hydraulic servo drum 24, a clutch C0 and a brake B0 are provided on the outer race 27 and a transmission case 130 on the outer circumference thereof, and a center on the rear side thereof. A piston 29 is fitted on the front side of the support 159 to form a hydraulic servo B-0 of the brake B0, and a return spring 32 provided on an inner peripheral portion 31 of the tip of the center support 159 is fitted.

In the underdrive mechanism chamber 134, a second hydraulic servo drum 41 opening rearward is rotatably fitted to the center support 159 at the front, and an annular piston 42 is fitted between the inner and outer peripheral walls of the second hydraulic servo drum 41 so that the hydraulic pressure of the clutch C2. Servo C-
2 and the return spring 44 on the inner peripheral wall side,
A clutch C2 is mounted inside the outer peripheral wall. On the rear side of the second hydraulic servo drum 41, a third hydraulic servo drum 46 having a rearward opening and an annular projection 35 on the front side is fixed to the rear end portion 15 of the first intermediate transmission shaft 14, An annular piston 47 is fitted between the portion 15 and the outer peripheral wall to form a hydraulic servo C-1 of the clutch C1, a return spring 49 is mounted on the inner peripheral side, and a clutch C2 is mounted on the outer peripheral surface of the annular protrusion 35. The second and third hydraulic servo drums 41 and 46 are connected via C2. A second planetary gear set p2 is provided on the rear side of the third hydraulic servo drum 46, and a ring gear R1 thereof is connected to the third hydraulic servo drum 46 via an annular protrusion 48 and a clutch C1. The sun gear S1 is formed integrally with the sun gear shaft 45 by spline fitting to the tip portion 1A of the second intermediate transmission shaft 1. In addition, the second and third hydraulic servo drums 41 and 46
And, the connecting drum 60 molded so as to cover the second planetary gear set p2 in the minimum space is fixed to the outer periphery of the second hydraulic servo drum 41 at its tip, and the rear end is the rear side of the second planetary gear set p2. Is connected to the sun gear shaft 45 with
A belt brake B1 is provided on the outer peripheral side.

Transmission case 13 on the rear side of the brake B2
The brake disc b2 of the brake B2 and the brake disc b3 of the brake B3 are spline-fitted from the front to the spline 75 formed on the inside, and the rear support wall on the rear side thereof
A piston 77 is fitted in an annular hole between the outer peripheral side of the rear support 156 of 157 and the transmission case 130 to form a hydraulic servo B-3 of the brake B3, and the return spring 79 of the hydraulic servo B-3 is provided with a rear support 156. It is supported by a retainer attached to the tip. A one-way clutch F1 having a sun gear shaft 45 as an inner race is provided inside the brake B2, an outer race 39 is connected to the brake B2, and a return biasing means 90 and an inner race are provided behind the one-way clutch F1. A one-way clutch F2, in which 83 is sprite fitted to the fourth hydraulic servo drum 72 at the outside inner diameter, is mounted. In the third planetary gear set p3, the sun gear S2 is formed integrally with the sun gear shaft 45, the carrier P2 is connected to the outer race 86 of the front one-way clutch F2, the brake B3, and the ring gear R2 is the second intermediate gear. It is connected to the intermediate portion 1B of the transmission shaft 1.

The transmission 300 has a transmission case 130 depending on vehicle driving conditions such as vehicle speed and throttle opening.
Engagement of each clutch and brake by the hydraulic pressure selectively output from the hydraulic control device 400 in the valve body 403 built in the oil pan 401 fastened to the lower part of the Alternatively, the gear is released, and four forward gear shifts or one reverse gear shift is performed. Table 1 shows an example of the operation of each clutch, the brake, and the one-way clutch and the achieved shift speed (RANGE).

In Table 1, E indicates that the corresponding clutch, brake, and one-way clutch are engaged. (L) indicates that the corresponding one-way clutch is engaged only in the engine drive state and is not engaged in the engine brake state. Further, L is engaged in the corresponding one-way clutch engine drive state, but the engagement is not always necessary because the transmission of power is guaranteed by the clutch or brake installed in parallel therewith ( Lock). Furthermore, f corresponds to 1
Indicates that the directional clutch is free. In addition, x indicates that the corresponding clutch and brake are released.

The transfer 500 in FIG. 3 has a clutch C3, a brake B4 and a clutch C4 which are friction engagement elements and a second intermediate transmission shaft 1 which is an output shaft of the planetary gear sets p1 and p2 as an input shaft, and the input shaft (1 ), The first output shaft 3 of the transfer, the input shaft (1) and the first
A planetary gear set Pf arranged between the output shaft 3 and
A four-wheel drive sleeve 551 rotatably fitted over the first output shaft 3 and a second output shaft provided in parallel with the input shaft (1) and mounted in the opposite direction to the first output shaft 3. 4. It has a transmission mechanism 53 between the sleeve 551 and the second output shaft 4. The planetary gear set Pf constitutes a third transmission together with the clutch C3 and the brake B4, and has a sun gear 544 spline-fitted to the end of the input shaft (1), a planetary pinion 545 meshing with the sun gear 544, and the planetary gear set. It comprises a ring gear 546 that meshes with the pinion 545, and a carrier 547 that holds the planetary pinion 545 rotatably and is connected to the tip of the first output shaft 3 of the transfer 500.

Brake B4 uses ring gear 546 and transfer case 140
And a cylinder 164 formed in the transfer case 140, which is a multi-plate friction brake for engaging with the cylinder.
It is operated by a hydraulic servo B-4 configured with a piston 164P mounted in 164. The clutch C3 is disposed on the transmission 300 side of the planetary gear set Pf, and connects and disconnects the sun gear 544 and the carrier 547. The clutch C3 includes a cylinder 550 connected to the carrier 547 and a piston 550P mounted in the cylinder 550. It is operated by the constituted hydraulic servo C-3. The clutch C4 is the first output shaft 3 connected to the carrier 547 and the second output shaft 3 of the transfer 500.
A multi-plate friction clutch for connecting and disconnecting a sleeve 551 connected to one sprocket 556 of a transmission mechanism 553 for driving the output shaft 4, and a cylinder 558 rotatably supported by a transfer case 140 and the cylinder 558. Hydraulic servo C-4 consisting of piston 558P mounted inside
Is operated by. The transmission mechanism 553 includes a sprocket 556 spline-fitted to the sleeve 551, a sprocket 555 formed on the second output shaft 4, and a chain 557 stretched between these sprockets.

On the outer peripheral side of the cylinder 550 of the hydraulic servo C-3, a parking gear 559 is provided so as to surround the transmission 300.
When the shift lever is selected to the parking position, the pawl meshes with the parking gear 559 to fix the first output shaft 3.

During normal traveling, the line pressure supplied to the hydraulic control device of the automatic transmission is supplied to the hydraulic servo C-3 to engage the clutch C3, and the hydraulic servos B-4 and C-4 are exhausted to brake B4 and the clutch. Release C4. As a result, the sun gear 544 and the carrier 547 of the planetary gear set Pf are connected, and the power is transmitted from the input shaft (1) to the first output shaft 3 at a reduction ratio of 1, so that two-wheel drive traveling with only the rear wheels is obtained. At this time, the power from the input shaft (1) is transmitted from the carrier 547 to the first output shaft 3 via the clutch C3 without passing through the sun gear 544, the planetary pinion 545, and the ring gear 546. Load on the
Gear life is increased. When four-wheel drive is required during this two-wheel drive, the shift lever provided in the driver's seat or the like is manually shifted, and the line pressure is gradually supplied to the hydraulic servo C-4 of the transfer control device 600 to cause the clutch C4. Is smoothly engaged, the first output shaft 3 and the sleeve 551 are connected to each other, and power is transmitted to the front wheels via the transmission mechanism 553, the second output shaft 4 and the propeller shaft, and the input shaft (1) moves to the first shaft. Power is transmitted to the output shaft 3 and the second output shaft 4 at a reduction ratio of 1, and is in a four-wheel drive direct-coupling traveling state (high-speed four-wheel drive state).
Is obtained. If the shift lever is manually shifted when it is necessary to increase the output torque on a steep slope during the four-wheel drive traveling, the run pressure is gradually supplied to the hydraulic servo B-4 and the hydraulic servo C-3 operates at an appropriate timing. The hydraulic pressure is discharged, the brake B4 is gradually engaged, and the clutch C3 is smoothly released. As a result, the sun gear 544 and the carrier 547 are released and the ring gear 546 is fixed, and the power is reduced from the input shaft (1) via the sun gear 544, the planetary pinion 545, and the carrier 547 to the first output shaft 3 and the second output shaft 3. It is transmitted to the output shaft 4, and a four-wheel drive decelerated traveling state with a large torque (low-speed four-wheel drive state) is obtained. Table 2 shows the setting range of the manual shift of the transfer 500, the engagement and release of the brake B4, the clutches C3 and C4, and the running state of the vehicle.

In Table 3, ∘ indicates the engaged state of the friction engagement element, and × indicates the released state. The reduction ratio (3.0 in the example) was calculated by the reduction ratio = (1 + λ) /λ=3.0 when the tooth number ratio of the sun gear 544 and the ring gear 546 of the planetary gear mechanism is λ and the tooth number ratio λ is 0.5. It is a thing.

[Brief description of drawings]

FIG. 1 is a skeleton diagram of an automatic transmission for four-wheel drive adopting a transmission shaft support device for an automatic transmission for four-wheel drive of the present invention, and FIG. 2 is a transmission shaft of an automatic transmission for four-wheel drive of the present invention. FIG. 3 is a cross-sectional view of a main transmission of a four-wheel drive automatic transmission adopting a supporting device, and FIG. 3 shows a four-wheel drive automatic transmission adopting a transmission shaft supporting device of the four-wheel driving automatic transmission of the present invention. It is sectional drawing of an auxiliary transmission. In the figure, 1 …… Second intermediate transmission shaft, 3 …… First output shaft, 11 ……
Input shaft, 14 ... 1st intermediate transmission shaft, 100 ... Automatic transmission, 2
00 …… torque converter, 300 …… transmission, 400 …… hydraulic control device, 500 …… transfer

Front Page Continuation (72) Inventor Yoshiharu Harada, 1 Toyota Town, Toyota City, Aichi Prefecture, Toyota Motor Co., Ltd. (72) Inventor, Kazuaki Watanabe, 1 Toyota Town, Toyota City, Aichi Toyota Motor Company, Ltd. Examiner Chiba Fulfillment (56) Reference JP-A-53-123764 (JP, A)

Claims (2)

[Claims] 1. A transmission case, a transfer case connected to a rear end portion of the transmission case, first and second transmissions housed in the transmission case, and a third case housed in the transfer case. Of the transmission, an input shaft for transmitting the driving force from the engine to the first transmission, and an input shaft arranged coaxially with the input shaft. The driving force from the first transmission is transmitted to the second transmission. A first intermediate transmission shaft that is transmitted to the transmission, and a second intermediate transmission that is disposed coaxially with the first intermediate transmission shaft and that transmits the driving force from the second transmission to the third transmission. A shaft, an output shaft that is disposed coaxially with the second intermediate transmission shaft, and that transmits the driving force from the third transmission to a wheel, and an input side end of the second intermediate transmission shaft, Rotate freely in the case First supporting means for supporting, second supporting means for rotatably supporting the output side end of the second intermediate transmission shaft on the transfer case, the first supporting means and the second supporting means. Between the third supporting means for rotatably supporting the intermediate portion of the second intermediate transmission shaft to the transmission case, and the second supporting means between the third supporting means and the second supporting means. A fourth supporting means for rotatably supporting the intermediate transmission shaft on the transfer case, and a play amount in the third supporting means is set to be larger than a play amount in the first and second supporting means. The amount of play in the fourth supporting means is set to be larger than the amount of play in the third supporting means, the transmission shaft supporting device for a four-wheel drive automatic transmission. 2. A center hole is provided at an output side end of the first intermediate transmission shaft, and an input side end of the second intermediate transmission shaft is inserted into the center hole, so that an input side end of the output shaft. The transmission shaft support device for an automatic transmission for four-wheel drive according to claim 1, wherein a central hole is provided in the portion, and the output side end of the second intermediate transmission shaft is inserted into the central hole.