JPS6234045Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a carrier device for an automatic transmission. An automatic transmission for a vehicle generally includes a gear transmission mechanism incorporating a planetary gear mechanism and a frictional engagement device, and selects one of a plurality of gears by selectively engaging the frictional engagement device. It is configured to achieve either of the following. The planetary gear mechanism is configured with a plurality of pinions interposed between a sun gear and a ring gear, and a carrier that supports the pinions and a drum that constitutes a frictional engagement device are:
Each is connected to the input shaft by a separate support structure. For this reason, there has been a problem in that the oil passage for supplying hydraulic oil to the piston hydraulic chamber for clutch operation in the drum has to become complicated. Note that, as described in Japanese Patent Publication No. 52-40372, there are pinion shafts with a lubricating oil passage for lubricating the sliding contact portion of the shaft, but there is a lubricating oil passage for supplying hydraulic oil to the piston hydraulic chamber. No one is known to have one installed on the pinion shaft. In view of the above points, the present invention is designed to integrally fix a carrier and a clutch drum to both ends of the pinion shaft, and provide an oil passage for supplying hydraulic oil that passes through the pinion shaft and communicates with the piston hydraulic chamber of the drum. The purpose is to simplify the hydraulic oil supply passage, and to achieve this purpose, a gear transmission having a planetary gear mechanism and a power transmission member of the gear transmission are selectively engaged. In an automatic transmission equipped with a friction engagement device configured to achieve any one of a plurality of gears in combination, the automatic transmission is arranged between a sun gear and a link gear of the planetary gear mechanism and rotates on its own axis. A carrier supporting the pinion and a drum having a piston hydraulic chamber for operating the frictional engagement device are integrally fixed to both ends of a pinion shaft that rotatably supports a pinion that revolves around the pinion. It is characterized by a structure in which an oil passage for supplying hydraulic oil is provided that penetrates the shaft and communicates with the piston hydraulic chamber. DESCRIPTION OF THE PREFERRED EMBODIMENTS A carrier device for an automatic transmission according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In the hydraulic torque converter shown by reference numeral 1 in the figure, the input side is driven by a crankshaft (not shown) connected to the engine, and includes an impeller 2 connected to the crankshaft, and a fixed housing 4. It includes a stator 5 and a turbine 6 supported via a one-way clutch 3. The turbine 6 is supported by a rotating shaft 7, which operates as an output shaft of the torque converter 1 and at the same time as an input shaft of a gear transmission 8, which will be described later. The gear transmission 8 is constituted by a planetary gear mechanism 9, which includes forward and reverse sun gears 10, 11, long and short pinions 12, 13, a ring gear 14, and the pinion. It includes a carrier 15 that rotatably supports the carriers 12 and 13. The carrier 15 has a pinion shaft 1 that rotatably supports the pinion 12.
It is fixed to one end of 6. A pinion 12 constituting a power transmission member is attached to the other end of the pinion shaft 16.
The drum 18 of the clutch 17 acts as a frictional engagement device for controlling the connection between the input shaft 7 and the input shaft 7.
are fixed together. Code 19 is clutch 1
7 hub. Note that the pinion 13 is interposed between the sun gear 10 and the pinion 12. Another clutch 20 is incorporated which acts as a frictional engagement device to control the connection between the input shaft 7 and the forward sun gear 10 constituting the power transmission member. Numerals 21 and 22 are the drum and hub of clutch 20. Further, another clutch 23 is incorporated which acts as a frictional engagement device to control the connection between the input shaft 7 constituting the power transmission member and the reverse sun gear 11. Furthermore, a brake 27 supported by the housing 26 is provided for braking the reverse sun gear 11. Numerals 24 and 25 are the drum and hub of the clutch 23, and the hub 25 is integrally formed with the drum 21 of the clutch 20. The ring gear 14 is connected to an output shaft 38 of the gear transmission 8 via a connecting shell 28. On the other hand, a one-way clutch 29 is installed between the carrier 15 and the housing 26. Table 1 shows the operating conditions of the clutch, one-way clutch and brake in various gears.

[Table] In Table 1, E indicates that the corresponding clutch, one-way clutch, or brake is engaged. By referring to the drawings and Table 1 in conjunction, the operation of the automatic transmission in the various gears will be apparent to those skilled in the art. In the illustrated automatic transmission, clutches 17, 2
The structure of 0.23 is a conventionally known clutch structure for this type of automatic transmission. For example, the clutch 17 is composed of a drum 18 and a hub 19, and an outer plate 30 on the drum 18 side and an outer plate 30 on the hub 19 side are arranged to overlap in the axial direction so that they can rotate relative to each other. An inner plate 31 is provided. The outer plate 30 is the drum 1
It is connected to a long pinion 12 via a pinion 8 and rotates therewith. Further, the inner plate 31 is connected to the input shaft 7 via the hub 19, and rotates together with the input shaft 7. In order to press these outer plate 30 and inner plate 31 together in the axial direction and frictionally brake the relative rotation between them, a cylinder-piston device consisting of a cylinder 32 and a piston 33 is provided. By supplying hydraulic pressure to the piston hydraulic chamber 34 configured between the cylinder 32 and the piston 33, the piston 33 is driven to the right in the figure with respect to the cylinder 32, and the piston 3
The overlapping body of the outer plate 30 and the inner plate 31 is compressed between the outer plate 30 and the snap spring 35. Reference numeral 36 denotes a compression coil spring for returning the piston 33 when the hydraulic pressure is released. In addition, other clutches 20, 2
The structure of No. 3 is also similar. An oil passage 37 for supplying hydraulic pressure to the piston hydraulic chamber 34 is formed from the carrier 15 through the pinion shaft 16. The oil passage 37 communicates with an oil pan (not shown) via a control valve via a communication passage 38. By forming the oil passage 37 so as to pass through the pinion shaft 16 in this way, the formation of the oil passage can be significantly simplified compared to the conventional structure in which the oil passage 37 is communicated through the input shaft. Next, the effects of the automatic transmission carrier device of the present invention will be described. That is, according to the present invention, the pinion shaft that rotatably supports the pinion interposed between the sun gear and the link gear of the planetary gear mechanism has at both ends a carrier supporting the pinion and a friction engagement device for operating the pinion. A drum equipped with a piston hydraulic chamber is fixed integrally with the drum, and an oil passage for supplying hydraulic oil is provided that passes from the carrier through the pinion shaft and communicates with the piston hydraulic chamber, unlike the conventional example. Compared to a system in which hydraulic oil is supplied to the piston hydraulic chamber via the input shaft, this has the practical effect of significantly simplifying the formation of the oil passage.

[Brief explanation of the drawing]

The drawing is a half-longitudinal cross-sectional view of an automatic transmission according to an embodiment of the present invention. 8... Gear transmission, 9... Planetary gear mechanism, 1
7, 20, 23...Friction engagement device (clutch),
10, 11...Sun gear, 12...Pinion, 1
4...Ring gear, 15...Carrier, 16...
Pinion shaft, 18...Drum, 34...Piston hydraulic chamber, 37...Oil passage.

Claims (1)

[Scope of utility model registration request] A gear transmission having a planetary gear mechanism; and a friction engagement device configured to selectively engage a power transmission member of the gear transmission to achieve one of a plurality of gears. In the automatic transmission, the pinion shaft is located between the sun gear and the ring gear of the planetary gear mechanism, and rotatably supports the pinion that rotates and revolves around its axis. A carrier that supports the pinion shaft and the friction engagement device are provided at both ends of the pinion shaft. A drum having a piston hydraulic chamber for operation is fixed integrally with the drum, and an oil passage for supplying hydraulic oil is provided which passes from the carrier through the pinion shaft and communicates with the piston hydraulic chamber. Transmission carrier device.