JPH0140370Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic transmission for a vehicle, and particularly to an automatic transmission for a vehicle equipped with a planetary gear mechanism. More specifically, the present invention relates to a lubrication structure for a brake device in a vehicle automatic transmission equipped with a planetary gear mechanism.

(Prior Art) Conventionally, automatic transmissions commonly used in automobiles have a planetary gear mechanism connected to the output shaft of a torque converter, and the planetary gear mechanism is appropriately combined with a brake, a clutch, etc. By engaging and disengaging the clutch, the power transmission path of the planetary gear mechanism is switched to obtain the required gear ratio.
There are many documents disclosing this type of automatic transmission using a planetary gear mechanism, but one example is JP-A-57
−9347 can be mentioned. In the planetary gear mechanism of this transmission, a brake drum is fixed to the pinion carrier, and a brake band is arranged to engage with the outer periphery of the brake drum.

(Problems to be solved by the invention) As mentioned above, in an automatic transmission having a planetary gear mechanism combined with a drum brake, it is necessary to lubricate the brake drum, but conventional transmissions do not have a structure for this purpose. Simple and effective measures have not been taken.

Therefore, the present invention aims to provide a simple and effective structure for lubricating drum brakes in an automatic transmission with a planetary gear mechanism.

(Means for solving the problem) In order to achieve the above purpose, in this invention,
One of the components of the planetary gear mechanism of the automatic transmission is connected to the inner periphery of the disk, and a brake drum is provided on the outer periphery of the disk so as to extend from the disk to one side in the axial direction. A curved portion curved in the same direction as the extending direction of the drum is formed in the intermediate portion, and a lubricating oil passage that penetrates the disk in the thickness direction is formed in a radially outer portion of the curved portion. A lubricant hole is formed that penetrates the drum in the thickness direction.

(Function) In a planetary gear mechanism of an automatic transmission, needle bearings are arranged on the front and rear surfaces of the disk that supports the brake drum to restrain movement in the axial direction. This needle bearing is supplied with lubricating oil from the transmission shaft. The lubricating oil used to lubricate the needle bearing flows radially outward along the surface of the disk due to centrifugal force, and normally returns to the return line as it is, but in the present invention, a curved portion is formed on the disk. Because of this, lubricating oil collects on the radially outer portion of this curve. Then, this lubricating oil passes through a lubricating oil passage formed in the curved portion and reaches the opposite surface. Since the curved portion is formed in the same direction as the brake drum, the lubricating oil is thus guided to the inner surface of the brake drum. The lubricating oil that has reached the inner surface of the brake drum passes through holes formed in the drum and is guided to the outer surface of the drum, where it performs a lubricating action. Therefore, the lubricating oil once used to lubricate the needle bearing is used again to lubricate the drum brake, and the lubrication effect can be enhanced with a simple configuration without increasing the discharge amount of the oil pump.

(Effects) According to the present invention, as described above, the disk that supports the brake drum is provided with a curved portion in the direction of the drum, and the lubricating oil passage that penetrates the disk in the thickness direction is provided in the radially outer portion of the curved portion. The brake drum can be effectively lubricated with a simple structure in which lubricating oil holes are formed in the thickness direction of the brake drum.

(Example) The figure shows an example of an automatic transmission equipped with the lubrication structure of the present invention, in which an input shaft 1 is connected to an engine crankshaft (not shown). A torque converter 2 and a multi-speed gear device 10 are arranged coaxially with the shaft 1 in order from the engine side. Torque converter 2 above
is equipped with a pump 3, a turbine 4, and a stator 5, and the pump 3 is fixed to an input shaft 1. The stator 5 rotates via a one-way clutch 6 on a fixed shaft 7 integral with the case 11 of the multi-speed gear system 10. The one-way clutch 6 is
Although stator 5 is allowed to rotate in the same direction as pump 3,
It has an effect that does not allow reversal.

The multi-speed gear device 10 has a base end fixed to the crankshaft 1 and a distal end extending through the center of the multi-speed gear device to drive an oil pump P disposed on the side wall of the device. It has a central shaft 12 connected to the pump. On the outside of this central shaft 12, a hollow turbine whose base end is connected to the turbine 4 of the torque converter 2, whose distal end extends to the side wall of the multi-speed gear unit 10, and is rotatably supported by the side wall. A shaft 13 is provided. A Ravigneau type planetary gear unit 14 is provided on the turbine shaft 13, and this planetary gear unit 14 is connected to a small diameter sun gear 15, and a large diameter sun gear 1 disposed on the side of the small diameter sun gear 15 far from the engine.
6, a long pinion gear 17, a short pinion gear 18, and a ring gear 19.
First and second clutch devices 20 and 21 are arranged in parallel on the side of the planetary gear unit 14 that is far from the engine. The first clutch device 20 connects and disconnects power transmission between the small diameter sun gear 15 and the turbine shaft 13 via the first one-way clutch 22. On the other hand, the second clutch device 21 is connected in parallel with the first clutch device 20 to connect and disconnect power transmission between the small diameter sun gear 15 and the turbine shaft 13. A first brake device 2 is disposed radially outwardly of the second clutch device 21.
3 is placed. This first brake device 2
3 is a drum brake, which includes a brake drum 23a connected to the large-diameter sun gear 16 and a brake band 23b hooked to the brake drum.
has. radially outward of the first clutch device 20 and the first brake device 2
A third clutch device 24 is disposed on the side of the first brake device 23, and this third clutch device 24 is connected to the brake drum 23a of the first brake device 23.
The power transmission between the large-diameter sun gear 16 and the turbine shaft 13 is switched on and off through the .

A second brake device 25 is arranged radially outward of the planetary gear unit 14 for engaging and disengaging the carrier 14a of the planetary gear unit 14 and the case 11 of the multi-speed gear device 10. A second one-way clutch device 26 is disposed between the first and second brake devices 23 and 25 in parallel with the second brake device 25 for engaging and disengaging the carrier 14a and the case 10a. On the side of the planetary gear unit 14 on the engine side, there is a fourth clutch device 27 for connecting and disconnecting power transmission between the carrier 14a of the planetary gear unit and the turbine shaft 13.
is located. This fourth clutch device 27
An output gear 28 connected to the ring gear 19 is arranged on the side of the engine side.
This gear 28 is provided on the output shaft 28a. In addition, the reference numeral 29 in the figure indicates a lock-up clutch for directly connecting the turbine shaft 13 and the crankshaft 1 without using the torque converter 2.

To explain the details of the brake device 23, the brake drum 23a is attached to the outer periphery of the disk 30, and from the outer periphery of the disk 30 to one side in the axial direction,
That is, it extends in the direction of the brake 24. The inner circumference of the disk 30 is fixed to the outer circumference of a disk portion 31 formed integrally with the large diameter sun gear 16, and both sides of the disk portion 31 are fixed to the outer circumference of a disk portion 31 formed integrally with the large diameter sun gear 16.
2 and 33, and movement in the axial direction is restrained. Furthermore, a curved portion 34 that bulges in the direction of the brake drum 23a is formed in the radially intermediate portion of the disk 30.
A lubricating oil passage 35 is formed in the radially outer portion of the lubricating oil passage 35 . The brake drum 23a also has a lubricating oil hole 36 that passes through the drum 23a in the thickness direction.
is formed. Oil sent from the oil pump P is sent through an oil passage 37 between the central shaft 12 and the turbine shaft 13, and is sent to the turbine shaft 13.
It passes through the oil hole 38 that penetrates in the thickness direction, and further,
The oil reaches the needle bearings 32 and 33 through an oil hole 39 formed in the large diameter sun gear 16, and lubricates the needle bearings. A portion of the oil that has lubricated the needle bearing 32 reaches the curved portion 34 through the side surfaces of the disk portion 31 and the disk 30, and tends to accumulate in the radially outer portion of the curved portion 34. This oil then reaches the opposite side of the disc 30 through the lubricating oil passage 35, and is guided by centrifugal force to the inner surface of the brake drum 23a along the surface of the disc 30. The oil thus led to the inner surface of the brake drum 23a reaches the outer surface of the brake drum 23a through the hole 36, and performs a lubricating action on the brake device 23.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an automatic transmission showing an embodiment of the present invention. FIG. 2 is an enlarged sectional view of the disk. 2...Torque converter, 10...Multi-stage gear transmission, 14...Planetary gear unit, 15
...Small diameter sun gear, 16...Large diameter sun gear, 23
... Brake device, 23a ... Brake drum,
23b... Brake band, 30... Disc,
31... Disc portion, 32, 33... Needle bearing, 34... Curved portion, 35... Lubricating oil passage, 36
...Lubricating oil hole.

Claims (1)

[Scope of utility model registration request] The drum brake has a planetary gear mechanism, and is provided with a drum brake for restraining one element of the planetary gear mechanism, and the drum brake includes a disk whose inner circumference is connected to the element of the planetary gear mechanism, and It consists of a brake drum provided on the outer periphery of the disk so as to protrude to one side in the axial direction, and a brake band arranged to be coupled to the outer periphery of the brake drum, and the disk has needle bearings on both axial sides. In a lubrication structure for an automatic transmission in which lubricating oil is supplied to the needle bearing from the transmission shaft side, the disk is curved at a radially intermediate portion in the same direction as the extending direction of the drum. A lubricating oil passage is formed in a radially outer portion of the curved portion to pass through the disk in the thickness direction, and the lubricating oil flowing along the disk surface via the needle bearing is directed to the brake. An automatic transmission characterized in that the brake drum is configured to lead the lubricating oil to the inner surface of the drum, and the brake drum is formed with a lubricating oil hole that penetrates the drum in the thickness direction and guides the lubricating oil from the inner surface to the outer surface. lubrication structure.