JPH0256539B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multi-shaft type automatic transmission for vehicles in which transmission shafts are arranged in parallel.

[Prior Art] As shown in Fig. 1, a conventional automatic transmission for a vehicle is as follows.
An automatic transmission consisting of an input shaft connected to the output shaft of an engine through a coupling such as a fluid coupling or a friction clutch, and an output shaft connected in series so as to have a coaxial center with the input shaft and to which an output gear is attached. a first shaft rotatably supported by the case; a long shaft parallel to the first shaft and rotatably supported by the automatic transmission case; and a short shaft rotatably attached to the long shaft. One of the long shaft and the short shaft is an input shaft, and an input gear is provided, which is directly meshed with the output gear of the first shaft, or connected by a chain, or connected via an idler gear, The other is an output shaft and has a second shaft provided with an output gear, and a drive gear gear that meshes directly with the output gear of the second shaft, is connected via a chain, or is connected via an idler gear. A vehicular automatic transmission consisting of a differential, a first planetary gear transmission provided on the first shaft, and a second planetary gear transmission provided on the second shaft transmits large torque and increases the vehicle speed. On the output side of the second shaft having a corresponding rotational speed, a governor hydraulic control device for generating governor pressure according to the shaft speed is attached to the hydraulic control device of the automatic transmission. This governor hydraulic pressure generating device is driven by fixing a governor drive gear to the output shaft (output shaft of the second shaft) of the second planetary gear transmission, but conventionally, the governor drive gear is attached to the output shaft of the second shaft. Since taking up space will increase the axial dimension, a governor drive gear is formed between the outer circumference of the ring gear of the planetary gear set and the inner circumferential wall of the transmission case by connecting it to a rotating member that rotates together with the output shaft. A method was taken to do so. Such a method is also disclosed in JP-A-55-40371. However, the diameter of the governor drive gear becomes larger on the outer periphery of the ring gear, whereas the input gear of the governor hydraulic pressure generator has a smaller gear diameter due to installation space, so the sliding speed of the tooth surface is high, and durability is reduced due to wear. It had some disadvantages.

[Problems to be Solved by the Invention] Therefore, the present invention is capable of preventing wear of the tooth surface of the input gear of the governor hydraulic pressure generating device without increasing the axial dimension of the second shaft, and improving durability. The objective is to provide an automatic transmission for vehicles that can be improved.

[Means for Solving the Problems] In order to solve the above problems, the present invention has a first shaft connected to the output shaft of the engine via a starting device, and a shaft parallel to the first shaft. In a vehicle automatic transmission comprising a second shaft connected to the first shaft, and a differential having a large drive gear connected to an output gear of the second shaft, the first shaft comprises: It has an input shaft, an output shaft that is connected in series so as to have a coaxial center with the input shaft and has an output gear attached thereto, and a first planetary gear transmission provided between the input shaft and the output shaft. , the second shaft is rotatably supported by the automatic transmission case, and the second shaft includes a long shaft rotatably supported by the automatic transmission case, and a short shaft rotatably attached to the long shaft.
One of the long shafts and short shafts is an input shaft and is provided with an input gear connected to the output gear of the first shaft, and the other is an output shaft and is provided with an output gear, and between the input shaft and the output shaft. a second planetary gear transmission provided in the transmission case; The planetary gear unit has a one-way clutch installed between the sun gear shaft and the transmission case, the one-way clutch being fitted into a cylindrical part protruding from the intermediate wall on the input gear side,
A governor drive gear fixed to the carrier of the planetary gear unit is interposed between the outer peripheral wall of the cylindrical portion and the inner peripheral wall of the transmission case.

[Operations and Effects] According to the present invention, the one-way clutch is fitted into a cylindrical part protruding from the intermediate wall on the input gear side, and the governor drive gear fixed to the carrier of the planetary gear unit is fitted into the cylindrical part. Since the structure is interposed between the outer circumferential wall and the inner circumferential wall of the transmission case, the gear diameter of the governor drive gear can be reduced without increasing the axial dimension of the second shaft. By reducing the sliding speed of the tooth surface of the input gear of the governor hydraulic pressure generating device, wear of the tooth surface of the input gear can be prevented and durability can be improved.

[Embodiment] Fig. 1 shows a front engine, front drive type automatic transmission for an automobile. The transmission device of this automatic transmission includes a torque converter 100 that is a fluid coupling, an input shaft 210 that is integrated with the output shaft 110 of the torque converter, and a rear end (opposite to the engine) that has a coaxial center with the input shaft 210. Output gear 2 at the end)
3 is a first shaft 200 consisting of an output shaft 220 spline-fitted, a first planetary gear transmission mechanism 300 provided between the input shaft 210 and the output shaft 220 of the first shaft, and the first shaft The input gear 430 that meshes with the output gear 220 of the first shaft is attached to the rear end and is supported by the automatic transmission case, and the tip (the end next to the engine) is connected via a bearing. An input shaft 410 is a long shaft supported by an automatic transmission case, and an output shaft is a short shaft rotatably supported by the input shaft at the tip end of the input shaft 310 and is provided with an output gear 440. 420, and an input shaft 41 which is the long axis.
A second planetary gear transmission mechanism 500 is provided between the output shaft 420 and the output shaft 420, which is a short shaft, and has a large driving gear 610 that is parallel to the second shaft and meshes with the output gear 440 of the second shaft. Differential 600
Consisting of The torque converter 100 includes a front cover 102 connected to an engine output shaft 101.
, a pump impeller 103 connected to the front cover 102, a turbine runner 105 connected to the output shaft 110, and a stator 1 connected to the automatic transmission case via a one-way clutch 106.
07 and a direct coupling clutch 108. The first planetary gear transmission mechanism 300 provided between the input shaft 210 and the output shaft 220 of the first shaft 200 is an underdrive device for shifting into three forward stages and one reverse speed. gear set 31
0, rear planetary gear set 320, first multi-disc clutch 330, hydraulic servo 331 for engaging and releasing the multi-disc clutch, second multi-disc clutch 340, its hydraulic servo 341, first multi-disc brake. 350, its hydraulic servo 351, its second multi-disc brake 360, its hydraulic servo 361, and one-way clutches 370 and 380. The second planetary gear transmission mechanism 500 provided between the input shaft 410 and the output shaft 420 of the second shaft 400 includes a planetary gear set 510 provided with a governor drive gear 511 on the outer periphery, a multi-disc brake 520, and the like. It consists of a hydraulic servo 521, a multi-disc clutch 530, the hydraulic servo 531, and a one-way clutch 540. The differential 600 is a large drive gear 61 that meshes with the output gear 440 of the second shaft.
0, a differential gear box (gear box) 620 which is fastened to the large drive gear with bolts and whose support shafts protruding on both sides are rotatably supported by the automatic transmission case via bearings, and the center of the gear box 620. A small gear shaft 630 is supported at both ends by the peripheral box wall and fixed with pins, and is provided in the rotational direction of the gearbox 620. A pair of differential pinions 640 and 65 provided in
0 and the differential pinions 640 and 65, respectively.
680 and an axle 690.

This automatic transmission has a fastening surface 70 with the engine.
A torque converter housing 710 with an opening at 0A and housing the torque converter 100, and a differential 60 with an opening on the side opposite to the engine.
Differential housing 7 where 0 is stored
20, a second shaft support wall portion 730 that supports the tip of the second shaft (end near the engine), and a first room in which the planetary gear transmission mechanism 300 of the first shaft is housed. 811, 2nd
Transmission room 8 consisting of a second room 812 in which the planetary gear transmission mechanism 500 of the shaft is housed.
10 and the differential housing 720
The transmission case 8 consists of a differential room side wall portion 820 that covers the opening of the transmission case 8.
00, and a gear cover 900 fastened to the opposite side wall of the transmission case 500 to the torque converter. Reference numeral 910 denotes a hydraulic control device for the automatic transmission, which regulates the discharge pressure of the oil pump 130 provided between the torque converter 100 and the first planetary gear transmission mechanism 300 to line pressure, and controls the hydraulic servo, the torque converter, and the like. Output as hydraulic oil or lubricating oil to parts that require lubrication.

In this configuration, the governor drive gear 511
is the parking gear 4 welded to the output shaft 420.
The ring gear 51 is formed on the outer peripheral wall of the governor drive gear drum 442 and is a component of the planetary gear set 510.
The governor drive gear 5 is provided between the outer circumference of the governor drive gear 5 and the inner circumference wall of the second room 812 of the transmission case.
The sliding speed of the tooth surface with the input gear of the governor hydraulic pressure generating device that meshes with 11 increases.

Next, the present invention will be explained based on an embodiment shown in FIGS. 2 and 3.

In this embodiment, the second shaft 400 includes an output shaft 1 as a long axis and an input shaft 2 as a short axis. The output shaft 1 has a pair of tapered bearings 11, 1 at the rear end.
2, supported by the input gear 430 of the second shaft,
Furthermore, it is rotatably supported by the gear cover 900 of the automatic transmission case via a bearing 432 fitted in the hub 431 of the input gear, and the tip is a large diameter portion 10 with steps 121 and 131. A shaft hole 1 formed at the axial center of the tip large diameter portion 10
3 is the second shaft support part 73 of the torque converter case
The roller bearing 16 is externally fitted onto a support shaft 731 protruding from the shaft 731 through a roller bearing 16, and is rotatably supported. The input shaft 2 includes a cylinder 22 with an inner spline 21 that protrudes from the input gear 430 in the distal direction (engine direction). A second planetary gear transmission mechanism 500 provided between the input shaft 2 and the output shaft 1 of the second shaft is provided in the center of the second room 812 of the planetary gear set 3, the multi-disc brake 4, and the transmission case. Intermediate wall 85
0 is formed on the wall, and the multi-plate brake 4
A hydraulic servo 5 for engaging or disengaging, a multi-disc clutch 6, a parking gear 15 welded to a large diameter portion 10 provided at the tip of the output shaft, and a rear end of a parking gear 15 formed on the side wall to operate the multi-disc clutch. It consists of a hydraulic servo 7 and a one-way clutch 8.

The planetary gear set 3 includes a ring gear 31 that is spline-fitted to the cylindrical input shaft 2 protruding from the input gear and fixed with a snap spring 25, and a ring gear 31 that is externally fitted and spline-fitted to the rear end of the output shaft 1. the carrier 32, the hub portion 321 is fixed between the step 17 provided on the rear end of the output shaft 1 and the stopper ring 18 screwed to the rear end of the output shaft 1; A sun gear 33 provided on a sun gear shaft 34 rotatably fitted on the output shaft 1 between the stage 12 of the output shaft 1 and the carrier 32;
A planetary gear 35 is rotatably supported by the carrier 32 and meshed with the ring gear 31 and sun gear 33.
A hub portion 36A of the governor drive gear 36 is welded to A. The multi-disc brake 4 connects the transmission case 800 and the sun gear shaft 34 through a hub 41 welded to the tip of the sun gear shaft 34.
The clutch 6 can be fixed to the transmission case 800 or released from the transmission case 800, and the clutch 6 can be attached to the hub 4.
1 to the sun gear shaft 34 and the parking gear 15.
engage or disengage. One-way clutch 8
is attached between the sun gear shaft 34 and a cylindrical portion 851 protruding from the rear end of the intermediate wall 850 . The governor drive gear 36 is interposed between the outer periphery of the cylindrical portion 851 and the inner peripheral wall 812A of the second room 812 of the transmission case 800, and is connected to the input gear 851 of the governor hydraulic pressure generator 850 shown in FIG. It is meshed with.

In this second planetary gear transmission mechanism, when the brake 4 is released and the clutch 6 is engaged, the sun gear 33 is fixed to the carrier 32, so the power is transmitted from input gear 430 → input shaft 2 → ring gear 31 →
The transmission is carried out in the order of planetary gear 35 → carrier 32, (sun gear 33) → output shaft 1, (sun gear shaft 34, clutch 6, parking gear 5 and output shaft 1) → output gear 110, and the reduction ratio becomes 1, and the brake 4 is engaged and the clutch 6 is released, the sun gear shaft 34 is fixed to the transmission case 800, so the power is transferred to the input gear 4.
30 → input shaft 2 → ring gear 31 → carrier 32
The signal is transmitted in the order of →output shaft 1 →output gear 110, and a deceleration movement is performed.

In this second planetary gear transmission mechanism 500, during transmission, bending stress due to transmission between the input gear 430 and the output gear 230 of the first shaft is generated on the output shaft 1 with point A as the point of action, and 110 and the differential drive large gear 610, bending stress is generated with point B as the point of action. The stress applied to point B is borne by the support shaft 731 fixed to the automatic transmission case via the roller bearing 16, and is prevented from being applied as bending stress to the output shaft 1. Furthermore, since the output gear 230 of the first shaft and the input gear 430 of the second shaft are helical gears, the output shaft 1 has a thrust F on the left side in the figure.
1 is tapered roller bearing 11 and 12
It is generated in the planetary gear set 3 which is connected to the stage 17 via the carrier hub 32B and uses a helical gear, and is transmitted from the ring gear 31 to the input shaft 2, input gear 430, tapered roller bearing 11,
12, and stage 17 via carrier hub 321.
A thrust F2 on the left side in the figure is added to this, and a thrust F3 on the right side in the figure is added because the output gear 11 of the second shaft and the large driving gear of the differential are helical gears. The resultant force of the thrusts F1 and F2 is canceled out by the thrust F3 and the load on the left side in the figure that the bearing 432 receives, but the difference is borne by the intermediate wall 850 via the roller bearings 111 and 112.

As described above, the automatic transmission for a vehicle of the present invention has a second
The planetary gear transmission includes a planetary gear unit provided between an input gear on an intermediate wall provided in a transmission case, and a planetary gear unit provided between a sun gear shaft of the planetary gear unit and the transmission case. a directional clutch; a multi-disc brake provided on the output side of the intermediate gear for fixing or disengaging the sun gear shaft and the transmission case; and a multi-disc clutch for coupling or disengaging the sun gear shaft and the output shaft. has
The one-way clutch is fitted into a cylindrical part protruding from the intermediate support wall in the direction of the input gear, and the governor drive gear fixed to the carrier of the planetary gear set is connected between the outer peripheral wall of the cylindrical part and the transmission case. Since it is interposed between the governor drive gear and the inner circumferential wall, the gear diameter of the governor drive gear can be reduced without increasing the axial dimension of the second shaft, and the governor drive gear and the input gear of the governor hydraulic pressure generator can be connected to each other. The sliding speed of the tooth surface is small, which prevents tooth surface wear and improves durability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional automatic transmission for a vehicle, FIG. 2 is a sectional view of the second shaft portion of the automatic transmission for a vehicle according to the present invention, and FIG. 3 is an installation state diagram of a governor hydraulic pressure generator. be. In the figure, 400... second shaft, 1... output shaft of the second shaft, 36... governor drive gear, 850... governor hydraulic pressure generator.

Claims (1)

[Scope of Claims] 1. A first shaft connected to the output shaft of the engine via a starting device, a second shaft parallel to the first shaft and connected to the first shaft, and a second shaft connected to the first shaft. In a vehicle automatic transmission equipped with a differential having a large driving gear connected to two output gears, the first shaft is connected in series with an input shaft so as to have a coaxial center with the input shaft. and an output shaft to which an output gear is attached, and a first planetary gear transmission provided between the input shaft and the output shaft;
The second shaft is rotatably supported by the automatic transmission case, and the second shaft includes a long shaft rotatably supported by the automatic transmission case, a short shaft rotatably attached to the long shaft, and a long shaft. Alternatively, one of the short shafts is an input shaft and is provided with an input gear connected to the output gear of the first shaft, and the other is an output shaft and is provided with an output gear,
a second planetary gear transmission provided between the input shaft and the output shaft, the second planetary gear transmission being provided on the input gear side of an intermediate wall provided in the transmission case. and a one-way clutch installed between the sun gear shaft of the planetary gear unit and the transmission case, the one-way clutch protruding from the intermediate wall on the input gear side. A governor drive gear fitted into a cylindrical part and fixed to a carrier of the planetary gear unit is interposed between an outer circumferential wall of the cylindrical part and an inner circumferential wall of a transmission case. Automatic transmission. 2. The second planetary gear transmission is provided on the output gear side of the intermediate wall, and connects the sun gear shaft and the output shaft with a multi-disc brake that fixes or releases the sun gear shaft and the transmission case. 2. The automatic transmission for a vehicle according to claim 1, further comprising a multi-disc clutch that is released.