JPH01238722A - Annular piston with apply tube for hydraulic servo mechanism of automatic transmission - Google Patents

Abstract

PURPOSE:To aim at improvement of the fitting accuracy of a sealing member by press-forming an annular piston portion and an apply tube portion integrally and interposing an annular sealing member between a pressure face and the check plate of the sealing member. CONSTITUTION:A piston body 1 consists of an annular piston portion 10 and an apply tube 1A, an annular projection 111 is provided on a pressure wall 11 and the body 1 and the pressure wall 11 is integrally formed by press- forming. The annular outside sealing member 3 is held between the pressure wall 11 and the check plate of the sealing member 2 and has an outer diameter larger than these by a predetermined size, and the annular inside sealing member 4 is held between the pressure wall 11 and the check plate 2 and has an inner diameter smaller than these. Due to like this construction, the fitting accuracy of the sealing members 3, 4 to the piston portion 10 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an annular piston with an apply tube for a hydraulic servomechanism of an automatic transmission.

[Prior Art] Automatic transmissions used in vehicles include a hydraulic servo mechanism consisting of an annular hydraulic cylinder and an annular piston to operate an annular frictional engagement device such as a multi-disc brake or a multi-disc clutch. used. Due to design constraints such as the compactness of automatic transmissions, this hydraulic servo mechanism may not be formed in a position close to the frictional engagement device, so the movement of the annular piston acts on the frictional engagement device through the apply tube. is being carried out. Here, since the piston must slide accurately within the cylinder, precision is required for its external dimensions, so it has been manufactured by cutting. The apply tube was manufactured separately from the piston using a press.

However, machined pistons had the disadvantage of being heavy and costly. In order to solve this difficulty, pistons manufactured by pressing from sheet metal have been devised. (
JP-A-49-68159) In this prior art press-made piston, the sealing material for sealing oil between the cylinder and the piston is held on stepped surfaces provided on the inner and outer circumferences of the piston, respectively. It was attached by parts.

[Problems to be Solved by the Invention] Incidentally, in the prior art (Japanese Unexamined Patent Publication No. 49-68159), the piston and the apply tube were molded separately, which caused a problem of poor productivity. In order to solve this problem, there is a technical means of integrally molding the piston and the apply tube.

In such means, in order for the piston to slide accurately within the cylinder in accordance with the hydraulic pressure and for the apply tube to operate the frictional engagement device accurately and reliably, sealing material is used on the outer and inner peripheries of the piston. However, compared to a case where the piston and the apply tube are separate bodies, the piston and the apply tube need to be positioned and attached more accurately with respect to the axis and the angle with respect to the axial direction.

In this way, the reason why the piston and apply tube are required to be installed more accurately than when they are separate parts is that the axial length of the piston and apply tube is greater than that of separate parts. This is because there is less play in the radial direction.

For the reasons mentioned above, if the piston and apply tube are integrally molded, and the sealant installation similar to the prior art described above works, the installation of the sealant required as described above for the integrally molded piston and apply tube is difficult. There is a problem that the accuracy cannot be achieved when attaching.

[Means for Solving the Problems] In order to solve the above problems, the present invention takes the following measures.

That is, the present invention includes a pressure-receiving wall (11) in the shape of an annular disc, an annular sealing material (3) attached to the pressure-receiving surface of the pressure-receiving wall, and a cylindrical portion extending in the axial direction from the outer periphery of the pressure-receiving wall. An annular piston (1) with an apply tube for a hydraulic servo mechanism of an automatic transmission, comprising an annular piston part (10) and an apply tube part (IA) extending cylindrical in the axial direction from the cylindrical part, , the annular piston part (10) and the apply tube part (IA) are integrally press-molded,
The annular sealing material (3) is attached to the pressure receiving surface of the pressure receiving wall (11) by sandwiching the annular sealing material (3) between the pressure receiving surface and the sealing material retaining plate (2). shall be.

[Effects of the Invention] According to the present invention, since the piston and the apply tube are integrally molded using a press, productivity is excellent and costs are reduced, and fuel efficiency of automobiles can be improved.

In addition, in the present invention, the sealing material of the piston part is brought into contact with the pressure receiving surface of the annular piston part, and is held by the stop plate while ensuring accuracy regarding the axial center and the angle in the axial direction, so that proper and reliable function is achieved. We offer an annular piston with an apply tube that performs the following functions.

[Example] Next, the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 shows an annular piston with an apply tube for a hydraulic servomechanism according to the present invention.

Reference numeral 1 denotes an annular piston portion 1 consisting of an annular disk-shaped pressure receiving wall 11 and a cylindrical portion 12 extending in the axial direction from the outer periphery of the pressure receiving wall 11.
0 and an apply tube part IA extending from the cylindrical part 12, and an annular protrusion 1 coaxially located in the middle part of the pressure receiving wall 11.
11 is provided protrudingly. The main body 1 and the protrusions 111 are manufactured by press molding. 2 is a sealing material retaining plate spot-welded to the protrusion 111, and the pressure-receiving wall 11
It is made of a circular iron plate with a shape corresponding to that of the 3 is held between the outer diameter side of the welded portion between the pressure receiving wall 11 and the sealing material retaining plate 2, and has an outer diameter larger than these by a predetermined dimension, and the outer edge portion 31 protrudes beyond the retaining plate. 4 is a pressure-receiving wall 11;
It is held between the inner diameter side of the welded portion between the sealing material retaining plate 2 and the inner diameter thereof by a predetermined dimension, and the inner edge portion 41 is formed into a cylindrical shape that protrudes toward the side of the retaining plate. This is an annular inner sealing material.

The sealing material 3.4 is made of a flexible material such as rubber, resin, or leather, and the outer diameter of the sealing material 3 and the inner diameter of the sealing material 4 are as follows.
It is determined in accordance with the outer diameter and inner diameter of the annular cylinder into which the piston portion 10 of the annular piston with apply tube is fitted.

The protrusions formed on the pressure receiving wall 11 of the main body piston portion may be a plurality of annular protrusions, in which case a single annular seal with a portion corresponding to the protrusions cut out is used as a sealing material. However, by forming the annular protrusion 111 as in the above embodiment, the back of the protrusion (
The inner wall can be an annular groove for receiving a spring placed behind the annular piston 1 with the apply tube.

In addition to welding the stop plate 2, all fastening means and fixing means can be used to attach the sealing material to the pressure-receiving wall 11, but welding is the most advantageous from the viewpoint of productivity.

FIG. 2 shows an automatic transmission for an automobile equipped with an annular piston with an apply tube according to the present invention, which is housed in a hydraulic torque converter 100 and a transmission case 10 fastened to the torque converter case A. 100 and a propeller shaft (not shown), and a hydraulic control device 300 for the gear transmission 200 installed below the transmission case 10.

The hydraulic torque converter 100 is housed in a torque converter case A, and includes a pump impeller 140 and a one-way clutch 150 connected to the crankshaft of the engine.
stator 17 connected to fixed part 160 via
0, and a turbine runner 180.

The gear transmission 200 has a tip (torque converter 100
The transmission case 10 is housed in a cylindrical transmission case 10 which is open at the rear end and has an output shaft hole 211 in the side wall 210. an overdrive device 13 provided on the side wall 210 and connected to the output shaft 50; an intermediate support wall 60 fixed at an intermediate position between both devices; An intermediate shaft 40 for transmitting power between the drive device 12 and the overdrive device 13 is provided.

The underdrive device 12 includes first and second planetary gear devices 15, 16, a clutch device 23, 24 and a brake device 2.
5.35.37, one clutch direction 34.36.

The first planetary gear device 15 includes a sun gear 17, a planetary binion 18, a ring gear 19, and a carrier 20 that rotatably supports the planetary binion 18. The clutch device 23 is actuated by a hydraulic servo 23A formed in a drum 79 connected to the input shaft 14.
4 and the ring gear 19.

The clutch device 24 includes a drum-shaped coupling mechanism 8 on the intermediate shaft 40.
A sun gear is connected to the human power shaft 14 and the sun gear 17 by a hydraulic servo 24A provided in the drum 81, which is coupled to the pump cover 52 via Controls the connection with the shaft 27. The brake device 35 is operated by an annular hydraulic servo 35A provided on the inner wall of the transmission case 10, and controls the connection between the sun gear shaft 27 and the transmission case 10. The second planetary gear device 16 is
Sun gear 30, planetary pinion 31, ring gear 3
2, and a carrier 33 that rotatably supports the planetary binion 31. Sun gear 30 is sun gear shaft 2
7, and a one-way clutch 34 and the brake device 35 are provided in series between the sun gear shaft 27 and the transmission case 10. career 3
3 and the transmission case 10, a one-way clutch 36 and a brake device 37 operated by a hydraulic servo 37A provided on the torque converter side of the intermediate support wall 60 are provided in parallel with each other. The one-way clutches 34 and 36 are arranged radially concentrically, that is, axially overlapping.

A hollow intermediate shaft 40 extending to the center of the transmission 200 is supported on one side by the intermediate support wall 60, and on the other hand is supported in a shaft hole 211 formed in a side wall 210 of the transmission case via an output shaft 50. It is disposed coaxially with the input shaft 14 and is spline-fitted to the carrier 20 and ring gear 32 to transmit power from the underdrive device 12 to the overdrive device 13 .

The overdrive device 13 includes a planetary gear device 41, a clutch device 43, a brake device 49, and a one-way clutch 54. The planetary gear device 41 includes a sun gear 42, a planetary pinion 43, a ring gear 44, and a carrier 45 that rotatably supports the planetary pinion 43. The carrier 45 is integrally formed with the intermediate shaft 40, and the clutch device 49 is provided in a clutch tram 82 that is connected to the sun gear 42 and rotatably supported by the central cylindrical portion 61 of the intermediate support wall 60. It is operated by hydraulic servo 48A to control the connection between carrier 45 and sun gear 42. The brake device 49 is connected to the transmission case 1
An annular hydraulic cylinder 102 formed around the shaft hole 211 on the 0 side W and a spring 1 fitted into the cylinder 102.
The sun gear 42 and transmission case 10
Control connections with Since the hydraulic cylinder 102 of the hydraulic servo 49A is formed using the rear side wall 110 of the transmission case 10 for the purpose of reducing the axial dimension of the automatic transmission, the friction engagement portion 4 of the brake device
9B, and the operation of the annular piston 103 of the hydraulic servo 49A is applied to the frictional engagement portion 49B by an apply tube formed integrally with the piston 103.

The ring gear 44 corresponds to the output of the gear transmission 200 and the overdrive device 13, and the ring gear 44 has an iron bearing 70 fitted into the shaft hole 211 of the transmission case.
The output shaft 50 supported via the axially extending shaft 50 is integrally connected to the output shaft 50 . One-way clutch 54 controls the connection between carrier 45 and sun gear 42 .

Table 1 shows the relationship between the operation of the gear transmission and the operation of the clutch brake and one-way clutch.

Table ■ In this table, the numbers represent the illustrated clutch devices, brake devices, and one-way clutches, and ○ indicates that the clutch device and brake device are engaged, △
means that the one-way clutch is engaged when the engine is running. Each clutch device, brake device, and disengagement are controlled by supplying and discharging hydraulic pressure from a hydraulic control device to a hydraulic servo that constitutes this device.

A transmission cover 51 that covers the opening of the transmission case 1° is fastened between the torque converter 100 and the underdrive device 12, and a pump cover 52 is attached to the underdrive device side of the cover 51.
An oil pump 9, which is a hydraulic power source, is connected in between.
A hydraulic control device 300 supplies hydraulic pressure for operating each clutch device and brake device and hydraulic fluid for a hydraulic torque converter.

As described above, in the annular piston with an apply tube of the present invention, the apply tube and the piston are integrally press-molded and the sealing material is attached to the piston part, so the wall thickness of the piston part can be reduced and the weight can be reduced. Therefore, it is effective in reducing fuel consumption of automobiles, and since cutting is not required, productivity is excellent and manufacturing costs can be reduced.

Further, according to the present invention, the sealing material of the piston part is brought into contact with the pressure receiving surface of the annular piston part, and is held by the stop plate while ensuring accuracy regarding the axial center and the angle in the axial direction. We offer annular pistons with apply tubes that perform reliably.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an annular piston with an apply tube for a hydraulic servo mechanism of an automatic transmission according to the present invention, and FIG. 2 is a sectional view of the automatic transmission for an automobile. In the figure 1... Annular piston with apply tube 2.
・Sealing material retaining plate 3.4 ・Sealing material

Claims (4)

[Claims] (1) an annular piston portion consisting of an annular disc-shaped pressure receiving wall, an annular sealing material attached to the pressure receiving surface of the pressure receiving wall, and a cylindrical portion extending in the axial direction from the outer periphery of the pressure receiving wall; An annular piston with an apply tube for a hydraulic servo mechanism of an automatic transmission, the annular piston and the apply tube being integrally press-molded. for a hydraulic servo mechanism of an automatic transmission, wherein the annular sealing material is attached to the pressure-receiving surface of the pressure-receiving wall by sandwiching the annular sealing material between the pressure-receiving surface and a sealing material retaining plate. Annular piston with apply tube. (2) providing a portion protruding in the direction of the pressure receiving surface around the annular disc-shaped pressure receiving wall, and fixing the sealing material retaining plate to the protruding portion;
The hydraulic servo for an automatic transmission according to claim 1, wherein an annular sealing material with a portion corresponding to the protruding portion removed is sandwiched between the pressure receiving wall and the sealing material retaining plate. Annular piston with apply tube for mechanism. (3) The protrusion is an annular protrusion, and the inner wall of the protrusion is a receiving groove for a spring installed behind the piston. An annular piston with an apply tube for a hydraulic servo mechanism of an automatic transmission as described in . (4) With an apply tube for a hydraulic servo mechanism of an automatic transmission according to claim 2 or 3, wherein the protrusion of the pressure receiving wall and the stop plate are fixed by welding. Annular piston.