WO2016035723A1

WO2016035723A1 - Piston orientation control structure

Info

Publication number: WO2016035723A1
Application number: PCT/JP2015/074563
Authority: WO
Inventors: 陽紀岩井
Original assignee: Nok株式会社
Priority date: 2014-09-05
Filing date: 2015-08-31
Publication date: 2016-03-10
Also published as: JP6632520B2; JPWO2016035723A1

Abstract

The present invention relates to a piston orientation control structure in a structure in which a circular piston (14) is inserted in a circular cylinder chamber (13) and a supply port (16) for supplying hydraulic fluid for operating the piston (14) is provided in the cylinder chamber (13). In the piston orientation control structure: a circular partition member (22) is disposed between the piston (14) and the supply port (16); through holes (25) for passing the hydraulic fluid are provided in the partition member (22); multiple through holes (25) are provided on the periphery of the partition member (22); and the farther the through holes are provided from the supply port (16), the larger the cross-sectional area of the opening is set to be. As a result, the present invention makes it possible to limit slanted operation of the piston (14) even in piston devices (11) of a type in which only a single supply port (16) is set on the periphery.

Description

Piston attitude control structure

The present invention relates to a reciprocating piston, and more particularly to a piston posture control structure.

Conventionally, as shown in FIG. 3 (A), a piston device 11 for switching clutch engagement / disconnection for use in an automatic transmission of a vehicle such as an automobile is known. This piston device 11 is an annular cylinder provided in a housing 12. An annular piston 14 that is reciprocally inserted into the chamber 13 is provided.

FIG. 3A shows a state in which the multi-plate clutch 20 is in an OFF state. When hydraulic oil is supplied from the hydraulic oil supply port 16 to the cylinder chamber 13 in this state, as shown in FIG. The piston 14 moves downward in the figure against the elasticity of the return spring 19 and presses the clutch 20 to turn it ON.

The piston 14 is made of a metal ring, and a lip-shaped seal 15 made of a rubber-like elastic body is vulcanized and bonded to the inner peripheral portion and the outer peripheral portion of the metal ring. Or “bonded piston seal (BPS)”.

The following problems are pointed out with respect to the above prior art.

That is, as described above, the cylinder chamber 13 and the piston 14 inserted into the cylinder chamber 13 are both annular. However, when the hydraulic oil supply ports 16 are arranged in a plurality of equal distributions on the circumference, the hydraulic pressure is increased. However, the piston 14 operates normally as shown in FIG. 3B without being inclined.

However, as shown in FIG. 4, when the hydraulic oil supply port 16 is installed only at one location on the circumference, the hydraulic pressure does not act evenly on the circumference of the piston 14. The tilt operation is performed with respect to the central axis 0 of the thirteen. Therefore, there is a possibility that the normal operation may be hindered, for example, the piston 14 presses the clutch 20 with only a part of the circumference.

JP2007-303493A (FIG. 6)

In view of the above, the present invention provides a piston posture control structure that can suppress the piston from tilting even when the hydraulic oil supply port is installed only at one location on the circumference. The purpose is to provide.

In order to achieve the above object, a piston posture control structure according to claim 1 of the present invention is an operation in which an annular piston is inserted into an annular cylinder chamber and the piston is operated at one place on the circumference of the cylinder chamber. An oil supply port is provided, and an annular partition member is installed between the piston and the supply port, and a through hole through which the hydraulic oil is passed is provided in the partition member. A plurality of the through-holes are provided on the circumference of the partition member, and an opening cross-sectional area is set to be larger as it is provided farther from the supply port.

According to the above configuration, the hydraulic oil supplied from the supply port is once blocked by the partition member, and supplied to the piston via the through hole provided in the partition member. A plurality of through-holes are provided on the circumference of the partition member, and the opening cross-sectional area is set larger as the distance from the supply port is increased. Therefore, the oil pressure easily acts on the piston evenly on the circumference. Thereby, even if it is a case where the supply port of hydraulic fluid is installed only in one place on the circumference, it can control that a piston carries out an inclination operation.

The piston posture control structure according to claim 2 of the present invention is the piston posture control structure according to claim 1, wherein the through hole is disposed at a position closest to the supply port. And a second through hole disposed farthest from the supply port and an intermediate through hole disposed between the first through hole and the second through hole on the circumference of the partition member. The opening cross-sectional area is set larger in the order of the first through hole, the intermediate through hole, and the second through hole.

According to this configuration, a hydraulic oil supply route having a multistage (three or more stages) structure is set over the first through hole, the intermediate through hole, and the second through hole. Therefore, since the posture of the piston is controlled at a number of locations, the posture of the piston can be further stabilized.

The piston posture control structure according to claim 3 of the present invention is the piston posture control structure according to claim 2, wherein the first through hole and the second through hole are symmetrical by 180 degrees on the circumference of the partition member. The intermediate through-holes are set in line symmetry with the diameter line of the partition member connecting the first through-holes and the second through-holes being set as line symmetry.

According to this configuration, a hydraulic oil supply route having a line-symmetric structure with the diameter line connecting the first through hole and the second through hole as the center line is set. Therefore, since the piston is prevented from tilting in the direction intersecting the center line, the posture of the piston can be further stabilized.

The piston posture control structure according to claim 4 of the present invention is the piston posture control structure according to any one of claims 1 to 3, wherein the partition member has a seal washer and an inner peripheral wall surface of the cylinder chamber. It is attached to.

According to this configuration, the partition member can be easily attached to the inner peripheral wall surface of the cylinder chamber with the seal washer. If there is a space for attaching the seal washer and the partition member, the present invention can be applied to the existing piston device. It is possible to incorporate the structure of the invention.

A piston posture control structure according to claim 5 of the present invention is the piston posture control structure according to any one of claims 1 to 4, wherein the piston is incorporated in an automatic transmission to disengage the clutch. It is an automatic transmission piston used for switching.

According to this configuration, the effects of the present invention can be realized in the field of pistons for automatic transmissions that are incorporated in automatic transmissions and used for switching clutch engagement / disengagement.

According to the present invention, it is possible to prevent the piston from being tilted even when the hydraulic oil supply port is installed at only one place on the circumference.

BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing of the piston apparatus provided with the piston attitude | position control structure based on the Example of this invention, Comprising: FIG. 1 (A) is sectional drawing which shows the state before hydraulic oil supply (clutch OFF), FIG.1 (B). Is a cross-sectional view showing the state after supplying hydraulic oil (clutch ON) It is a figure which shows the partition member with which the structure is equipped, Comprising: FIG. 2 (A) is sectional drawing of a partition member, FIG.2 (B) is a top view of a partition member FIG. 3A is a cross-sectional view of a main part of a piston device according to a conventional example, FIG. 3A is a cross-sectional view showing a state before supplying hydraulic oil (clutch OFF), and FIG. 3B is a diagram after supplying hydraulic oil (clutch ON). Sectional view showing the state of Sectional drawing which shows the malfunction (piston tilting action) occurrence state in the piston device

The present invention includes the following embodiments.
(1) A bonded piston seal (BPS) is used in an automatic transmission such as an automobile AT, and the BPS moves to the clutch side when a hydraulic load is applied. Here, there is no problem in operation when the hydraulic inlets are installed in plural (equal distribution) on the circumference, but the hydraulic pressure is equal to the BPS when the hydraulic inlet is at one place and the oil viscosity is high at low temperature. It will not be added and will be tilted.
(2) Therefore, in the present invention, a plate (partition member) in which holes of different sizes are processed is installed between the hydraulic inlet and the BPS. The hole of the plate is set so that it is smaller as it is closer to the hydraulic inlet, and gradually increases in the opposite direction on the circumference.
(3) According to the present invention, by providing holes of different sizes (orifice effect) on the plate, it becomes easier for oil to turn to the circumferentially opposite side of the hydraulic inlet, and an equal hydraulic pressure is applied to the entire BPS. Inclination operation is suppressed.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a main part of a piston device 11 having a piston posture control structure according to an embodiment of the present invention. The piston device 11 is incorporated in an automatic transmission such as an AT or CVT of a vehicle such as an automobile, and is used for switching the on / off state of the clutch 20 when the piston 14 is displaced in the axial direction by hydraulic pressure. It is configured. In FIG. 1, the vertical direction in the figure is the axial direction.

That is, as shown in FIG. 1A, an annular cylinder chamber 13 is provided in a partially illustrated housing (clutch housing) 12, and a piston 14 with an annular seal 15 reciprocates in the axial direction in the cylinder chamber 13. A supply port (hydraulic inlet) for inserting hydraulic oil for operating the piston 14 to one end of the circumference of the cylinder chamber 13 in the axial direction (upward in the figure) and at one end on the circumference thereof. 16 is provided. Reference numeral 17 denotes a piston receiving member attached to the inner peripheral wall surface of the cylinder chamber 13 by a washer 18, and a return spring 19 for returning the piston 14 is interposed between the piston receiving member 17 and the piston 14. Yes.

The piston 14 is made of a metal ring, and an inner peripheral cylindrical portion 14b is integrally formed on the inner peripheral end portion of the annular flat surface portion 14a toward the other axial direction (downward in the drawing), and the same shaft is connected to the outer peripheral end portion of the flat portion 14a. The outer peripheral cylindrical portion 14c is integrally molded toward the other direction, and the other end in the axial direction of the outer peripheral cylindrical portion 14c serves as a pressing portion 14d for pressing the multi-plate clutch 20. In addition, a lip-shaped seal 15 made of a rubber-like elastic body is adhered to the inner peripheral surface of the inner peripheral cylindrical portion 14b and the other end portion in the axial direction. Similarly, a lip-shaped seal 15 made of a rubber-like elastic body is bonded to the end of each of the hydraulic oils, and these seals 15 are hydraulic oil supplied from the supply port 16 to the pressurizing chamber 13a between the supply port 16 and the piston 14 ( It is provided to seal (hydraulic).

Since the piston 14 is obtained by vulcanizing and bonding the seal 15 made of a rubber-like elastic body to the metal ring in this way, it is also called “bonded piston” or “bonded piston seal (BPS)” because of its structure or function. Called.

On the other hand, the piston receiving member 17 is also formed by vulcanizing and bonding a seal 21 made of a rubber-like elastic body to a metal ring, and has an effect of canceling the pressure in the back pressure chamber 13b between the piston receiving member 17 and the piston 14. Therefore, it is also called “bonded canceller” or “bonded canceller seal (BCS)” because of its structure or function.

An annular partition member 22 is installed in the pressurizing chamber 13 a between the supply port 16 and the piston 14, and the partition member 22 causes the pressurizing chamber 13 a to be separated from the first chamber 13 c between the supply port 16 and the partition member 22, and the partition member. 22 and a second chamber 13d between the piston 14. Therefore, as shown in FIG. 2 (A), the partition member 22 has a shape in which an annular convex portion 22b is provided toward the axial direction one side at the outer peripheral end of the annular flat portion 22a, and the inner periphery of the flat portion 22a. The surface is in close contact with the inner peripheral wall surface of the pressurizing chamber 13a, and the tip end surface of the convex portion 22b is in close contact with one end surface in the axial direction of the pressurizing chamber 13a. The partition member 22 is attached to the inner peripheral wall surface of the cylinder chamber 13 with a seal washer 23. Therefore, a groove portion 24 for engaging the seal washer 23 is provided on the inner peripheral wall surface of the cylinder chamber 13. Yes. The partition member 22 is formed of a rigid material such as metal or hard resin.

Further, as shown in FIG. 2B, the partition member 22 is provided with a through hole 25 for allowing the hydraulic oil to pass from the first chamber 13c to the second chamber 13d. A plurality of openings are provided on the circumference, and the opening cross-sectional area is set to be larger as they are provided farther from the supply port 16 in the mounted state.

The through hole 25 includes a first through hole 25A disposed at a position closest to the supply port 16, a second through hole 25B disposed at a position farthest from the supply port 16, and a first through hole. Intermediate through holes 25C to 25H arranged between the hole 25A and the second through hole 25B are provided on the circumference of the partition member 22, and the first through hole 25A, the intermediate through holes 25C to 25h, and the second through hole are provided. The opening cross-sectional area is set larger in the order of 25B.

The through hole 25 includes a first through hole 25A disposed at a position closest to the supply port 16, a second through hole 25B disposed at a position farthest from the supply port 16, and a first through hole. Intermediate through holes 25C to 25H arranged between the hole 25A and the second through hole 25B are provided on the circumference of the partition member 22, and among these, the first through hole 25A and the second through hole 25B are the partition member 22. The intermediate through-holes 25C to 25h are arranged at 180 ° symmetrical positions on the circumference, and the size and size of the opening cross-sectional area of the partition member 22 connecting the first through-hole 25A and the second through-hole 25B are d. Is set to be line symmetric with respect to the center line of line symmetry.

Furthermore, in the drawing, the eight through holes are provided at equal intervals on the circumference in the figure, and the breakdown is the third through hole 25C and the fourth through hole clockwise from the first through hole 25A. The second through hole 25B passes through the hole 25D and the fifth through hole 25E, and the second through hole passes through the sixth through hole 25F, the seventh through hole 25G, and the eighth through hole 25H counterclockwise from the first through hole 25A. Among these holes, the third through hole 25C and the sixth through hole 25F have the same opening cross-sectional area and are set larger than the first through hole 25A, and the fourth through hole 25D. And the opening cross-sectional areas of the seventh through holes 25G are set to be the same size and larger than the third through holes 25C and the sixth through holes 25F, and the fifth through holes 25E and the eighth through holes 25H are opened. The cross-sectional areas are set to the same size and the fourth through hole 2 It is set larger than D and the seventh through hole 25G, the opening cross-sectional area of the second hole 25B is set to be larger than the fifth hole 25E and the eighth through hole 25H. Accordingly, the eight through holes are the first through hole 25A, the third through hole 25C and the sixth through hole 25F, the fourth through hole 25D and the seventh through hole 25G, the fifth through hole 25E and the eighth through hole 25H, and The opening cross-sectional area is gradually increased over five stages in the order of the second through holes 25B.

In the piston device 11 having the above-described configuration, the clutch OFF state shown in FIG. 1A is set to the initial operation position. When high pressure hydraulic oil is supplied from the supply port 16 in this state, the supplied hydraulic oil is supplied. Is temporarily stored in the first chamber 13c by the partition member 22, and supplied to the second chamber 13d via the through holes 25A to 25H provided in the partition member 22. A plurality of through holes 25A to 25H are provided on the circumference of the partition member 22, and the opening cross-sectional area is set larger as the distance from the supply port 16 increases. It becomes easy to work evenly on the circumference. Therefore, even when the supply port 16 is installed only at one location on the circumference of the cylinder chamber 13, it is possible to suppress the piston 14 from tilting as shown in FIG.

In the above configuration, since the hydraulic oil supply route having a multistage (five-stage) structure is set by the eight through holes 25A to 25H, the posture of the piston 14 can be controlled at a number of locations. Since the hydraulic oil supply route having a line-symmetric structure is set by the two through holes 25A to 25H, the piston 14 is prevented from inclining in a direction crossing the line-symmetrical center line (diameter line d of the partition member 22). It is possible to do. Therefore, the posture of the piston 14 can be further stabilized.

In the above configuration, since the partition member 22 is attached to the inner peripheral wall surface of the cylinder chamber 13 with the seal washer 23, the partition member 22 can be easily attached to the inner peripheral wall surface of the cylinder chamber 13 with the seal washer 23. In addition, if there is a space for attaching the seal washer 23 and the partition member 22, the structure of the present invention can be incorporated into an existing piston device.

In the above embodiment, the number of the through holes 25 is eight. However, this is merely an example, and the number of the through holes 25 may be seven or less, or nine or more.

Moreover, in the said Example, although the partition member 22 decided to contact the inner peripheral wall surface and end surface of the pressurization chamber 13a directly, interposing the seal | sticker (not shown) which consists of rubber-like elastic bodies between both. Therefore, the sealing property may be improved. In this case, the seal is preferably bonded in advance to the partition member 22.

DESCRIPTION OF SYMBOLS 11 Piston apparatus 12 Housing 13 Cylinder chamber 13a Pressurization chamber 13b Back pressure chamber 13c 1st chamber 13d 2nd chamber 14

Piston

14a, 22a Plane part 14b Inner peripheral cylinder part 14c Outer periphery cylinder part

14d Press part

15,21 Seal 16 Supply port 17 Piston receiving member 18 Washer 19 Return spring 20 Clutch 22 Partition member 22b Protruding portion 23 Seal washer 24

Groove portion

25, 25A to 25G Through hole d Diameter line of partition member

Claims

An annular piston is inserted into the annular cylinder chamber, and a supply port for supplying hydraulic oil for operating the piston is provided at one place on the circumference of the cylinder chamber,
An annular partition member is installed between the piston and the supply port,
The partition member is provided with a through hole through which the hydraulic oil passes.
A plurality of the through holes are provided on the circumference of the partition member, and an opening cross-sectional area is set so as to be farther from the supply port.
In the piston attitude control structure according to claim 1,
The through holes include a first through hole disposed closest to the supply port, a second through hole disposed farthest from the supply port, the first through hole, and the second through hole. An intermediate through hole disposed between the holes is provided on the circumference of the partition member,
A piston posture control structure, wherein an opening cross-sectional area is set larger in the order of the first through hole, the intermediate through hole, and the second through hole.
In the piston attitude control structure according to claim 2,
The first through hole and the second through hole are arranged at 180 ° symmetrical positions on the circumference of the partition member;
2. The piston attitude control structure according to claim 1, wherein the intermediate through hole is set in line symmetry with a diameter line of the partition member connecting the first through hole and the second through hole as a center line of line symmetry.
In the piston attitude control structure according to any one of claims 1 to 3,
The piston posture control structure, wherein the partition member is attached to an inner peripheral wall surface of the cylinder chamber with a seal washer.
In the piston attitude control structure according to any one of claims 1 to 4,
The piston is a piston for an automatic transmission that is incorporated in an automatic transmission and used for switching the engagement / disengagement of a clutch.