JPH02125126A - Support structure for output shaft of automatic transmission - Google Patents

Abstract

PURPOSE:To secure concentricity and surely support shafts with the reasonable arrangement structure of the shafts by providing a stepped cylindrical rear shaft support member having a base section, a step section and a boss section, supporting the front end section of an output shaft on the front end inner periphery of the step section, and faucet-connecting the boss section to a hole formed on a rear wall face. CONSTITUTION:A boss section 125f is faucet-connected to a hole 303, and the centering precision of a rear shaft support member 125 is secured. The rear shaft support member 125 supports the sun gear shaft 108 of an auxiliary transmission on a base section 125a and the outer periphery of a step section 125d via bearings 125g and 125h. A thrust bearing 125j is arranged between the base section 125a and the step section 125d to receive the thrust applied to the sun gear shaft 108. The sun gear shaft 108 is surely supported by the rear shaft support member 125 both in the radial direction and the thrust direction. On the other hand, the inner periphery of the step section 125d supports the front section of an output shaft 120 via a bearing 120a. The inner periphery of the output shaft 120 supports the rear end section of an intermediate shaft 55 via a bearing 554.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a support structure for an output shaft of an automatic transmission equipped with a starting device and a planetary gear device.

[Prior art]

An automatic transmission that achieves four forward speeds by arranging a sub-transmission in series behind a main transmission equipped with a planetary gear is 1.
For example, the published technical literature S A E Tech
841.30 of nical Paper 5eries
4 is disclosed.

In the automatic transmission shown in this technical document.

The front and rear ends of the input shaft are supported by the transmission case via bearings, the front end of the output shaft is supported by the inner periphery of the rear end of the input shaft, and the rear end is supported by the transmission case by bearings. It has a supported shaft support structure.

[Problem to be solved by the invention]

In order to increase the number of gears of an automatic transmission to achieve, for example, five forward gears, the number of frictional engagement elements such as clutches increases, so it becomes necessary to have a multiple shaft structure. By configuring a shaft with multiple structures as an intermediate shaft, inserting this intermediate shaft between the input shaft and the output shaft, and supporting the front and rear ends of the intermediate shaft with the rear end of the input shaft and the front end of the output shaft, A rational shaft arrangement structure can be obtained. In order to achieve this shaft arrangement structure, it is important that the transmission case reliably support the input shaft and the output shaft.

An object of the present invention is to provide a support structure for an output shaft that achieves concentricity and reliable support.

[Means to solve the problem]

The present invention provides a rear wall surface (302) of a transmission case (3o).
The rear shaft support member (125) is provided with a stepped cylindrical rear shaft support member (125) that is attached to a hole (303) formed in the rear shaft support member (125).
5) is a base portion (125a) having the maximum outer diameter, and a multi-step stepped portion (125b) whose outer diameter is gradually reduced from the base portion toward the inside of the case.

125c, 125d) and a boss portion (125f) that protrudes on the opposite side of the stepped portion across the base, and the stepped portion is connected to the output shaft (120) at least at the inner peripheral portion of its front end. The front end portion of the case is supported, and the boss portion (125f) is attached by engaging a hole (303) formed in the rear wall surface (302) of the case with a spigot.

Note that the above-mentioned symbols in parentheses are in contrast to the drawings, but do not limit the configuration in any way.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 2 shows the skeleton of an automatic transmission, in which the automatic transmission 1 includes a torque converter 2, which is a starting device, and a transmission 3.
Equipped with. The transmission 3 is a main transmission 4 arranged concentrically.
and an auxiliary transmission 10, the main transmission 4 achieves four forward speeds and a reverse go speed, and the auxiliary transmission 10 achieves two speeds: a direct connection with a reduction ratio of 1 and a reduction ratio with a reduction ratio of 1 or more. Achieve. The transmission 3 uses five clutches, three brakes, and three one-way clutches as frictional engagement elements.

The torque converter 2 includes a converter case 21 that is an input member connected to the crankshaft of the engine, and the converter case 21 drives a pump impeller 22 . The hydraulic oil pressurized by the pump impeller 22 passes through the stator 23 supported by the case 3o of the transmission 3 via the one-sided clutch 24, drives the turbine runner 27, and transmits power to the turbine output shaft 28. A lock-up clutch 26 for coupling is provided between the pump impeller 22 and the turbine output shaft 28, and the converter case 21 and the output shaft 28 are directly coupled when necessary.

The output shaft 28 of the torque converter 2 acts as an input shaft of the main transmission 4, and this input is transmitted to the clutch drum 40 of the first clutch 41.

The first clutch 41 is a forward clutch that is always activated when the vehicle is moving forward, and power is transmitted via the clutch hub 43 to an outer race 46 that is integrated with the clutch hub 43 of the first one-way clutch 45. An inner race 47 of the one-sided clutch 45 drives a large sun gear shaft 48 and a large sun gear 49 that is integrated with the large sun gear shaft 48 . The first one-sided clutch 45 operates between 1st and 4th speeds.

A second clutch 52 is disposed inside the drum 40 of the first clutch 41 . The second clutch 52 is a clutch that operates in the fourth and fifth speeds, and the clutch hub 53 is connected to an intermediate shaft 55, and the intermediate shaft 55 supports the carrier 54 of the planetary gear system N8o.

The drum 40 of the first clutch 41 is the fifth clutch 65
drum 60. The fifth clutch 65 is a so-called coast clutch that transmits torque from the wheel side to the engine side, and its hub 67 is connected to the large sun gear shaft 4.
Combined with 8. A hub 74 of a third clutch 73 is connected to the drum 60 of the fifth clutch. The third clutch 73 is a so-called reverse clutch that operates during reverse travel, and the clutch drum 75 is connected to a small sun gear 78 via a small sun gear shaft 77. Third clutch 73
The drum 75 also serves as a brake drum for the first brake 71, and the first brake 71 is activated in the third and fifth speeds.

The planetary gear train M80 is a so-called Ravigneau-type planetary gear train that has two sun gears with different numbers of teeth and shares a carrier and a ring gear. However, in the present invention, a Ravigneau-type gear train with a ring gear as an output is used. adopt.

A shaft 81 is attached to the carrier 54 which is integrally connected to the intermediate shaft 55.
and one end of the shaft 83 is attached. The shaft 81 supports a long pinion 82 and the shaft 83 supports a short pinion 84. The large sun gear 49 meshes with the long pinion 82, and the small sun gear 78 meshes with the short pinion 84, respectively.

The other ends of the shaft 81 and the shaft 83 are connected to a hub 85 of a third brake 93, and the hub 85 supports a brake disc of a friction plate type brake 93 on its outer periphery, and the brake plate is supported on the case 30 side. Ru. The third brake 93 operates during reverse travel and for engine braking in 1st and 2nd gears.

The inner peripheral portion of the hub 85 forms an outer race 91 of the second one-way clutch 90, and an inner race 92 of the one-way clutch 90 is integrally fixed to the support 35 fixed to the case 30. The second one-sided clutch 90 operates in first and second speeds.

The short pinion 84 meshes with a ring gear 96 formed inside one end of a drum 95, and this drum 95 acts as an output member of the main transmission 4 and an input member of the sub-transmission 10.

That is, a ring gear 101 is provided inside the other end of the drum 95.
is integrally formed, and a shaft 105 is attached to this ring gear 101.
One end of the shaft 105, with which the pinion 102 supported by the output shaft 102 engages, is supported by a carrier 103, and the carrier 103 is integrated with the output shaft 120. The other end of the shaft 105 is connected to the clutch hub of the fourth clutch 104, and the clutch drum 110 of the fourth clutch 104 is connected to the second brake 11.
Also serves as the second brake drum.

The fourth clutch 104 operates in the second to fifth speeds, and brings the sub-transmission 10 into a directly connected state. The second brake 112 is a reverse brake that operates during reverse travel and during engine braking in first gear, and employs a band type brake.

The other end of the shaft 108, which has a sun gear 106 that meshes with the pinion 102 formed at one end, forms an inner race 109 of a third one-way clutch 113, and fixes an outer race 115 of the directional clutch 113 to the case 30. drum 11
0 is integrally coupled to shaft 108.

Figure 1 shows a cross section of an automatic transmission, and the whole is denoted by 1.
The automatic transmission shown by is composed of a torque converter 2 and a transmission 3. The torque converter 2 is installed in a case 20, and includes a drum-shaped converter case 21 connected to the crankshaft of the engine at the frontmost part (hereinafter, the side closest to the engine will be referred to as the "front side"). converter case 2
1 connects and drives an engine crankshaft and a pump impeller 22, and the hydraulic oil pressurized by the pump impeller 22 drives a turbine runner 27 and stator 2.
3 to the pump impeller 22. The turbine runner 27 drives a turbine shaft 28 directly connected thereto.

The stator 23 is connected to the fixed part 30 via the one-sided clutch 24.
A lock-up piston 25 is disposed between the turbine runner 27 and the drum-shaped converter case 21, and when necessary, a lock-up clutch 26 between the lock-up piston 25 and the converter case 21 is actuated to reduce the turbine output. The converter case 21 is directly connected to the shaft 28 which serves as the input shaft of the transmission. A case 20 of the torque converter 2 and a case 3 that houses the transmission 3
An oil pump cover 31 and a partition plate 32 are installed at the joint with 0.
and an oil pump housing 33.

The oil pump cover 31 consists of a face plate-like portion having an oil passage therein and a boss portion whose center portion protrudes rearward. The partition plate 32 supports the side surface of the rotating body of the oil pump 29 and defines an oil passage, etc., and forms the oil pump 29 within the oil pump housing 33 .

A rear end portion of the pump impeller 22 is coupled to a rotating body of an oil pump 29. The rotating body of the oil pump 29 is driven within the oil pump 29 to generate the necessary hydraulic pressure. The oil pump cover 31 has an oil pump 29 formed inside.
a face plate portion 311 that covers the entrance portion on the front side of the transmission case, and a hollow boss portion 312 that protrudes from the center of the transmission case into the inside of the case.
A hollow tubular support cylinder 34 is press-fitted into 2.

The support cylinder 34 supports the shaft 28 connected to the turbine runner 27 of the torque converter through a sleeve and a bearing inside the front and rear ends. This shaft 28 is an input shaft of the transmission 3, and the rear end of the shaft 28 is provided with a flange portion 281 that expands in the radial direction, and thrust bearings having the same diameter are interposed on both sides of the flange portion 281.

The outer circumference of the flange 281 is connected to an inner cylinder 401 of a clutch drum 4°, and a first clutch 41 is installed inside the clutch drum 40. The clutch drum 40 has a cylindrical shape with a supported front end and an open rear end, and rotates together with the input shaft 28 . Inner cylinder 401
The inner diameter side of the front support 31 slides and rotates on the outer circumferential surface of a cylindrical oil passage member 315 that forms an oil passage and is fitted to the outer circumference of the boss portion 312 of the front support 31 .

A large diameter piston 42 is provided on the outer circumference of the inner cylinder 401.
A piston 56 with a diameter of /J% is inserted in the form of a double piston. The large diameter piston 42 also serves as a cylinder for the small diameter piston 56, and is fitted inside the drum 40 in a fluid-tight manner. The large-diameter piston 42 is for operating the first clutch 41, and when the piston 42 is operated, the clutch plate is spline-engaged to the inside of the drum 40 and the clutch hub 43 is spline-engaged. Transmits power between the clutch disc and the clutch disc. A wall surface 431 extending in the axial direction is formed on the front side of the clutch hub 43.
Thrust bearings are arranged on both sides of 1. The inner diameter portion of the clutch hub 43 forms an outer race 46 of the first one-way clutch 45, and an inner race 47 of the − direction clutch 45 is formed integrally with the front end portion of the large sun gear shaft 48.

A large sun gear 49 is attached to the rear end of the large sun gear shaft 48 via serrations. The large sun gear shaft is cylindrical, and the inner periphery of its front and rear ends is connected to an intermediate shaft 55 by bearings.
I support it.

A second clutch 5 is disposed inside the large diameter piston 42 in the radial direction.
2 and a small-diameter clutch piston 56 that operates the clutch 52. The clutch plate is spline engaged with the inner peripheral surface of the piston 42, and the clutch disk is spline engaged with a clutch hub 53 disposed inside. The small-diameter piston 56 transmits power between the large-diameter piston 42 that rotates together with the drum 40 and the hub 53. It is always urged in the non-operating direction by a spring 541.

The clutch hub 53 has a wall surface 5 extending from the rear end side to the shaft center.
31, the intermediate shaft 55 is spline-serrated connected to the vicinity of the distal end thereof. The tip of the intermediate shaft 55 is the input shaft 28
It is supported via a bearing on the inner diameter of the rear end. The rear end of the intermediate shaft 55 is supported by the front end of an output shaft, which will be described later, and a carrier 54 that extends in the radial direction is provided near the rear end of the intermediate shaft 55.

The open rear end of the drum 40 containing the first clutch 41 and the second clutch 52 is connected to a fifth clutch by a spline.
The clutch drum 60 of the clutch is coupled to the clutch drum 60 of the clutch. A fifth clutch 65 is provided inside the clutch drum 60 and includes a clutch plate that is spline-engaged with the clutch drum 60 and a clutch disc that is spline-engaged with a clutch hub 67 located inside the clutch drum.
Deploy. A lower end of a wall surface 671 formed from the front side of the clutch hub 67 toward the axis is coupled to the large sun gear shaft 48 . An inner cylinder 601 is formed on the inner circumferential side of the clutch drum 60, and the outer circumferential side of the inner cylinder 601 supports a piston 66 in a slidable manner. A return spring 661 is provided between the piston 66 and the inner cylinder 601. The inner peripheral side of the inner cylinder 601 is rotatably supported by a stepped cylindrical member 771. clutch drum 60
A clutch hub 74 is integrally fixed to the drum 60 on the opposite side of the fifth clutch 65.
A clutch disk constituting the clutch 73 is supported via a spline.

The clutch plate of the third clutch 73 is supported by a drum 75 that also serves as an outer cylinder, and a belt-type first brake 71 is provided on the outer periphery of the drum 75. An inner cylinder 751 is formed on the inner circumferential side of the drum 75, and a piston 76 that operates the clutch 73 is slidably supported on the outer circumferential side of the inner cylinder 751. Inner cylinder 751
A return spring 761 is provided between the piston 76 and the piston 76 . The tip of the inner cylinder 751 is a cylindrical member 771
Since the drum 75 is spline-engaged with the inner circumference of the cylindrical member 771 and the front end of the small sun gear shaft 77, the drum 75 rotates together with the small sun gear shaft 77.

The small sun gear shaft 77 is cylindrical and has a small sun gear 78 formed at its rear end. The inner peripheral portions of the front and rear ends of the small sun gear shaft 77 are supported by the large sun gear shaft 48 via bearings.

A central support member 35 is provided at the center inside the case 30. This central support member 35 has a flange portion that engages with the inner peripheral portion of the case, a stepped boss formed in the inner diameter direction of the flange portion that protrudes to the front side, and a short boss that protrudes to the rear side, and protrudes to the front side. A small-diameter ring member 36 and a large-diameter ring member 37 are respectively fitted to the outer periphery of the stepped portion of the boss.

The small diameter ring member 36 rotates and slides on the inner circumference of the cylindrical member 771 at its outer circumference, and the large diameter ring member 37 rotates and slides on the inner circumference of the inner cylinder 751 of the drum 75 at its outer circumference via a bearing. It is rotatably supported by a member 37.

The intermediate shaft 55 supports the large sun gear shaft 48, and the large sun gear shaft 48 supports the small sun gear shaft 77.

This shaft part has a triple shaft structure.

The rear side of the flange portion of the central support member 35 forms a cylinder, into which a piston 94 for actuating a third brake 93 is fitted. An iron sleeve 38 is press-fitted into the inner diameter of the central support member 35, and the rear end of the sleeve 38 is formed into a ring shape, into which the inner race 92 of the second one-way clutch 90 is press-fitted. A return spring 941 is interposed between the inner race 92 and the piston 94. The outer race 91 of the second one-sided clutch 90 also serves as the hub of the third brake 93, and a brake disc is spline-engaged with the outer periphery of the outer race 91. The brake plate of the third brake 93 is fitted onto the inner periphery of the case 30 with a spline.

A ring member 911 is fixed to the rear side of the outer race 91 of the second one-sided clutch 9o.
1 and the carrier 54 of the intermediate shaft 55.
and supports the pinion shaft 83. These pinion shafts 8
A plurality of pinion shafts 1.83 are provided, and the pinion shaft 81 supports a long pinion 82 and the pinion shaft 83 supports a short pinion 84. Short pinion 84 meshes with small sun gear 78 and ring gear 96, and long pinion 82 meshes with large sun gear 49.

The ring gear 96 is fixed to the front end of the drum 95,
The inner hole formed in the wall surface 951 of the drum 95 has a gap between it and the intermediate shaft, and both sides of the inner hole are supported by thrust bearings. The ring gear 96 has a ring gear 101 at its rear end on the opposite side with this wall surface 951 in between.

The ring gear 101 provides input to the auxiliary transmission, and as described above, the auxiliary transmission is a reduction gear having one set of planetary gear trains, and is of the type that takes the input of the ring gear from the carrier and outputs it. . A pinion 102 that meshes with a ring gear 101 meshes with a sun gear 106, and the pinion 102 is supported by a shaft 105. The front end of the shaft 105 is supported by a carrier 103 formed at the front end of an output shaft 120, and a hub 107 of a fourth clutch 104 is provided at the rear end of the shaft 105. The clutch hub 107 supports a clutch disk by a spline, and supports a clutch plate by a spline on the inner circumference of an opposing drum 112.

A second brake 112 is arranged on the outer periphery of the drum 110.

A stepped cylindrical rear shaft support member 125 that protrudes toward the front of the case 30 is attached to the rear wall of the transmission case 30, and the inner circumference of the cylindrical sun gear shaft 108 is attached to the outer periphery of the rear shaft support member 125. Support the periphery. The sun gear shaft 108 has a sun gear 106 that meshes with the pinion 105 at its front end, and the rear part of the sun gear shaft 108 is integrated with the drum 110. A piston 116 is fitted inside the drum 110,
A return spring 117 is provided between the piston 116 and the sun gear shaft 108.

An inner race 109 of a third one-way clutch 113 is formed on the rear side of the drum 110 of the sun gear shaft 108, and an outer race 115 of the one-way clutch 113 is spline supported inside the case 30.

A rear case 301 that supports the output shaft 120 is attached to the rear end of the case 30, and the output shaft is supported by bearings arranged inside the front end of the rear shaft support member 125 and inside the rear end of the rear case 301. The outer diameter portion of the rear end of the intermediate shaft 55 is supported by a bearing.

The output shaft 120 is provided with a parking gear 126 and a speedometer drive gear 131.

The parking gear 126 cooperates with a pawl 127 disposed on the fixed side to achieve a parking brake, and the drive gear 131
drives the speedometer.

A flange 129 is integrally provided on the parking gear 126, and the rotation speed of the output shaft 120 is obtained by detecting passage of the flange through a slit with a sensor 130.

At the rear end of the output shaft 120 is a connecting member 135 to the axle shaft.
is inserted and fixed to the output shaft 120 with a nut 136. A hydraulic control device (not shown) is provided at the bottom of the transmission case 30, and a clutch of the transmission.

Controls brake operation. The hydraulic control device is covered with a cover 11 that also serves as an oil pan.

The operation of the single automatic transmission will be explained below.

This automatic transmission has five forward speeds and one reverse speed. Table 1 shows each speed and the operation of the frictional engagement elements that achieve the speed change.

Table 1 (0) indicates operation during engine braking. Table 1 shows the gear stage in the vertical column and the frictional engagement element in the contact area. The 0 mark indicates that the frictional engagement element is operating. , (○) indicates that it operates during engine braking,
Reference numerals 41, 52, 73°104.65 indicate the first to fifth clutches, and reference numerals 71, 112, .
93 indicates the first brake to the third brake, respectively;
Reference numerals 45, 90, and 113 indicate the first to third one-sided clutches, respectively.

Figures 3 to 8 show the power transmission paths at each gear stage, and the thick line portion is the path where the power is transmitted.
The shaded area indicates the element to be fixed.

Figure 3 shows the power transmission path at 1st speed, and shows the input shaft 28.
The power is transmitted from the first clutch 41 to the first one-sided clutch 45 and drives the large sun gear shaft 48 and the large sun gear 49. Since the shaft 81 of the long binion with which the large sun gear 49 meshes is fixed by the action of the second one-sided clutch 90, the rotation of the large sun gear 49 is decelerated and transmitted to the ring gear 96. This rotation is transmitted to ring gear 101 via drum 95. ] At high speed, the sun gear shaft 108 of the planetary device constituting the sub-reducer is fixed by the action of the third one-sided clutch 113, so the rotation input from the ring gear 101 is decelerated and transmitted to the carrier 103 and output shaft 120. Output from.

That is, in the first speed, the rotation that has been decelerated by the main transmission is further decelerated by the sub-transmission and then output.

FIG. 4 shows the power transmission path in 2nd speed, and the same path as in 1st speed is followed up to the drum 95, which also serves as the output shaft of the main transmission and the input shaft of the auxiliary transmission.

The fourth clutch 104 of the auxiliary transmission operates to maintain the auxiliary transmission in a directly coupled state, and the input from the drum 95 is transmitted to the output shaft 120 as is.

FIG. 5 shows the power transmission path at the third speed, in which the first brake 71 operates to fix the small sun gear shaft 77. The power of the large sun gear shaft 48 is decelerated from the large sun gear shaft 49 and transmitted to the ring gear. The reduction ratio at this time is small sun gear 78
, large sun gear 49° is determined by the number of teeth of ring gear 96. The fourth clutch 104 is operated to maintain the direct connection state of the sub-transmission, and the power of the drum 95 is directly transmitted to the output shaft.

FIG. 6 shows the power transmission path at the fourth speed, where both the first clutch 41 and the second clutch 52 operate. Therefore, the power of the input shaft 28 is transferred to the intermediate shaft 55 and the large sun gear shaft 4.
Since the planetary gear train does not move relative to each other, the intermediate shaft 55 and the large sun gear shaft 48 are directly connected to the drum 95. The auxiliary transmission is also maintained in a directly connected state, and eventually the input shaft 28 and output shaft 120 are directly connected.

FIG. 7 shows the power transmission path at the fifth speed, in which the second clutch 52 operates and the power from the input shaft 28 is transmitted to the intermediate shaft 55. The first brake 71 operates and the small sun gear shaft 7
7 is fixed, the rotation of the carrier 54 integrated with the intermediate shaft 55 is accelerated and transmitted to the drum 95. Since the direct connection state of the sub-transmission is maintained, the power of the drum 95 is directly transmitted to the output shaft 120.

The fifth speed is an overdrive in which the rotational speed of the input shaft 28 is increased and transmitted to the output shaft 120.

FIG. 8 shows the power transmission path during reverse movement, in which the third clutch 73 operates to transfer the power from the input shaft 28 to the small sun gear shaft 77.
tell to. Since the third brake 93 operates and fixes the short pinion shaft 83 that meshes with the small sun gear shaft 78,
The rotation of the small sun gear shaft 78 is reversed with deceleration and transmitted to the ring gear 96 and drum 95. Since the second brake 112 of the sub-transmission is also activated and fixes the sun gear shaft 108, the power input to the ring gear 101 is decelerated and transmitted from the carrier 103 to the output shaft 120.

Therefore, when reversing, the auxiliary transmission further decelerates the vehicle.

This speed change state is shown in the speed diagram of FIG.

In the figure, reference numeral 4 indicates a main transmission equipped with a Ravigneau planetary gear mechanism, and reference numeral 10 indicates an auxiliary transmission that achieves deceleration (underdrive).

The gear ratio of each transmission is determined by appropriately selecting the number of gear teeth of the planetary gear train, but in this transmission, the sub-transmission that acts as a speed reducer is activated only during first speed and reverse. The reason for this is to avoid, as much as possible, control to engage and disengage two clutches and brakes at the same time.

FIG. 10 shows details of the present invention, in which a wall 302 is formed perpendicularly to the central axis of the transmission at the rear end of the transmission case 3o, and a rear case 301 is attached. wall 3
A hole 303 is provided in the center of 02, and the rear shaft support member 125 is inserted into this hole 303 and fixed with a bolt 305.

The rear shaft support member 125 is a stepped cylindrical member that includes stepped portions 125b and 125C1125d whose outer diameters decrease sequentially from a base portion 125a having a maximum outer diameter toward the front, and a base portion 125a.
A boss portion 125f that protrudes rearward from the base is coaxially formed. The boss portion 125f that protrudes rearward is attached to the wall 3 of the case 30.
The centering precision of the rear shaft support member 125 is ensured by engaging the hole 303 provided in the rear shaft support member 125 with a spigot.

The rear shaft support member 125 supports bearings 125g, 125 by its base 125a and the outer periphery of the stepped portion 125d at the tip.
The sun gear shaft 108 of the sub-transmission is supported via h. A thrust bearing 125j is arranged on the vertical wall formed between the base 125a and the step 125b, and the sun gear shaft 1
Receives the thrust of 08. Therefore, sun gear shaft 1
08 is reliably supported by the rear shaft support member 125 in both the radial direction and the thrust direction.

The sun gear shaft 108 has a sun gear 102 of the sub-transmission at its tip.
A third one-way clutch 113 is provided on the outer periphery of the rear end.
An inner lace 109 is formed.

The outer periphery of the central part of the sun gear shaft 108 is connected to the fourth clutch 1.
It also serves as an inner cylinder 108a that slidably supports the piston 116 of No. 04.

The sun gear shaft 108 is provided with an oil passage 108b for supplying and discharging hydraulic oil to and from the piston 116, and an oil passage 125m is also formed in the rear shaft support member 125 corresponding to the oil passage 108b. Since the sun gear 108 rotates, oil seal rings 125n are fitted on both sides of the oil passage 125m.

The wall 302 of the case 30 is also provided with an oil passage 302a that communicates with the oil passage 125m of the rear shaft support member 125, and communicates with the hydraulic control device. Inner race 10 at the rear end of sun gear shaft 108
9 is also formed with an oil passage 109a for lubricating the third one-sided clutch 113, and communicates with an oil passage 125p for supplying lubricating oil formed in the rear shaft support member 125.

The inner peripheral portion of the stepped portion 125d at the tip of the rear shaft support member 125 supports the front portion of the output shaft 120 via the bearing 120a. The output shaft 120 has an oil passage 120d in the center,
It is supported by the rear carrier case 301 with bearings. The inner peripheral portion of the portion of the output shaft 120 supported by the bearing 120a supports the rear end portion of the intermediate shaft 55 via a bearing 554.

An oil passage 552 for lubrication passing through the intermediate shaft 55 is provided at the center of the intermediate shaft 55, and an oil passage 552a formed radially from this oil passage 552 is connected to the carrier 103 formed at the front end of the output shaft 120. Lubricating oil is supplied to the planetary gear section of the sub-transmission via an oil passage 103a provided inside. A thrust bearing 103b is arranged between the carrier 103 and the sun gear shaft 108.

〔Effect of the invention〕

In the automatic transmission output shaft support structure of the present invention, the rear shaft support member is a separate member from the rear wall of the transmission case. You can choose freely.

The rear shaft support member rotatably supports the sun gear shaft of the auxiliary transmission on its outer periphery using two radial bearings and one thrust bearing to receive radial and thrust loads, and its internal portion supports the sun gear shaft of the auxiliary transmission. The tip is supported by a radial bearing, and the thrust load of the output shaft is also supported via the sun gear shaft. Therefore, this rear shaft support member is accurately attached to the transmission case with its axis aligned, and the race surface of the bearing is aligned with high precision.
It is necessary to process while ensuring hardness that satisfies durability.

In addition, this rear shaft support member needs to supply and discharge hydraulic oil to the rotating sun gear shaft through an oil passage in a circumferential groove formed on the outer periphery, and the durability of the oil sealing fitted on both sides of the oil passage is required. In order to improve performance, high dimensional accuracy and surface roughness of the rotating and sliding parts are required.

Since this rear shaft support member is a stepped cylindrical member, it is easy to cut and grind, and can be processed with high precision. Furthermore, by appropriately selecting the material, it is easy to control the surface hardness through heat treatment. In addition, when attaching the rear shaft support member to the transmission case, the boss provided at the rear of the rear shaft support member is inserted into the circular hole formed on the rear wall of the case using a pilot engagement. , so-called centering is easy and highly accurate mounting can be achieved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an automatic transmission according to the present invention, and FIG. 2 is an explanatory diagram showing an outline of the automatic transmission. Figure 3 is an explanatory diagram showing the power transmission line at 1st speed, Figure 4 is an explanatory diagram showing the power transmission line at 2nd gear, and Figure 5 is an explanatory diagram showing the power transmission line at 3rd gear. Fig. 6 is an explanatory diagram showing the power transmission line when in 4th gear, Fig. 7 is an explanatory diagram showing the power transmission line when in 5th gear, and Fig. 8 is an explanatory diagram showing the power transmission line when in reverse. An explanatory diagram showing a route. FIG. 9 is a diagram showing the gear ratio, and FIG. 10 is a sectional view of the main parts. 1... Automatic transmission, 2... Torque converter, 4...
...Main transmission, 10...Sub-transmission, 28...Input shaft, 30...
...Transmission case. 35... Central support member, 48...
...Large sun gear shaft, 55...Intermediate shaft, 77...Small sun gear shaft, 120...
・・・・・・Output shaft, 125・・・・・・Rear support member. Patent Applicant: Aisin ADA Co., Ltd. Agent: Patent Attorney: Meiki 8 Akira (2 others) Fig.

Claims (1)

[Claims] (1) A support structure for an output shaft of an automatic transmission equipped with a starting device and a planetary gear device, which includes a stepped cylindrical rear shaft support member that is attached to a hole formed in the rear wall of the transmission case, and The shaft support member includes a base having the maximum outer diameter, a plurality of stepped portions whose outer diameters are gradually reduced from the base toward the inside of the case, and a boss that protrudes on the opposite side of the stepped portion across the base. and the stepped part supports the front end of the output shaft at least at the inner periphery of the front end thereof, and the boss part is mounted by engaging a hole formed in the rear wall surface of the case with a spigot. A support structure for the output shaft of an automatic transmission characterized by: