JP4132219B2 - Piston member and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a piston member for switching a clutch of a shift switching device of an automatic transmission for an automobile, and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, this type of piston member has been applied as a piston member for switching the clutch of a shift switching device of an automatic transmission for an automobile, for example.
[0003]
FIG. 3 is a schematic configuration diagram showing a main part of a power connection part (clutch part) 100 of a conventional automatic transmission used in an automobile or the like.
[0004]
In the figure, a sleeve 101 is attached to an input side shaft (not shown) to which a driving force from the internal combustion engine side is transmitted.
[0005]
To the sleeve 101, the inner end of the radial portion 102a of the housing 102 having a bottomed cylindrical shape is fixed.
[0006]
A pressure plate 103, a cancel plate 104, and a multi-plate clutch 105, which are piston members, are arranged on the inner periphery of the axial direction portion 102b of the housing 102 from the radial direction portion 102a side.
[0007]
The pressure plate 103 is fitted in an annular hole between the outer periphery of the sleeve 101 and the inner periphery of the axial portion 102b of the housing 102, and is configured to be slidable in the axial direction while hermetically dividing the annular region KR. ing.
[0008]
Therefore, the pressure plate 103 is provided with an oil seal O1 that contacts the outer periphery of the sleeve 101 and slidably seals on the inner side of the inner diameter end portion 103a, and the axial direction portion of the housing 102 on the outer side of the outer diameter end portion 103b. An oil seal O2 that contacts the inner periphery of 102b and slidably seals is disposed.
[0009]
The cancel plate 104 is disposed so as to face the pressure plate 103, and movement in the axial direction is restricted by a stopper member 106 that is locked to the sleeve 101.
[0010]
A spring 107 is interposed between the pressure plate 103 and the cancel plate 104 and urges the pressure plate 103 to push it back in the opposite direction to the multi-plate clutch 105.
[0011]
The multi-plate clutch 105 is composed of a plurality of clutch plates. When the pressure plate 103 is moved by the control hydraulic pressure introduced into the pressure chamber AR, the multi-plate clutch 105 is pressed against the outer diameter end portion 103c of the pressure plate 103, so that the clutch plate Crimping is performed to transmit the driving force.
[0012]
In this way, in the configuration shown in FIG. 3, the pressure plate 103 is formed by cutting aluminum, and the piston function is exhibited by the pressure plate 103 and the two oil seals O1 and O2.
[0013]
Here, in recent years, for the purpose of simplifying the configuration and processing, a metal ring (corresponding to the pressure plate described above) is formed by press molding as shown in FIG. 4, and a rubber lip (the oil seal described above) is formed on the metal ring. ) Is used.
[0014]
FIG. 4 is a schematic configuration diagram of a piston member according to the prior art.
[0015]
As shown in FIG. 4, the piston member is configured by baking a rubber lip 120 on a metal ring 110 formed by press molding.
[0016]
As shown in the figure, the metal ring 110 is formed by press forming, roughly the cylindrical portion 110a extending in the axial direction, the end surface portion 110b at the axial end of the cylindrical portion 110a, and the outer peripheral side for hermetically dividing the annular region KR. A radial wall surface portion 110c and an inner circumferential radial wall surface portion 110d are formed.
[0017]
Here, the cylindrical portion 110a functions as a sliding portion with the inner periphery of the housing (corresponding to the inner periphery of the axial portion 102b of the housing 102 in the configuration shown in FIG. 3), and the end surface portion 110b is a clutch. The outer peripheral side radial wall surface 110c and the inner peripheral radial wall surface 110d have a function of dividing the region.
[0018]
Note that the sealing function is exhibited by the rubber lip 120 and other sealing members.
[0019]
As described above, the piston member shown in FIG. 4 is excellent in workability because the metal ring 110 can be formed by press working.
[0020]
[Problems to be solved by the invention]
However, in the case of the piston member according to the prior art shown in FIG. 4 as described above, the following problems have occurred although it is excellent in workability.
[0021]
In the case of the piston member described above, the dimensional accuracy of the surface that pushes the clutch plate is functionally important.
[0022]
Therefore, the distance L2 from the end surface to the end surface portion 110b of the outer peripheral radial wall surface portion 110c and the deflection of the end surface portion 110b with respect to the shaft core C are factors of dimensional accuracy that affects the functionality.
[0023]
However, when the metal ring is pressed, waviness occurs on the surface to be processed, and the dimensional accuracy is inferior to that when aluminum or the like is cut.
[0024]
Therefore, in order to obtain a desired dimensional accuracy, the undulation must be removed by crushing with a press. In the case of the above-described configuration, the entire surface of the outer peripheral side radial wall surface 110c, which is a dimensional reference surface, is pressed. Therefore, it is difficult to remove the undulation sufficiently because the undulation has to be removed and the load on the press is large.
[0025]
Therefore, in order to reliably obtain a desired dimension, after press molding, the outer peripheral side radial wall surface portion 110c and the end surface portion 110b must be further cut, which may increase the number of processing steps. It was.
[0026]
The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to provide a piston member and a manufacturing method thereof that improve dimensional accuracy while facilitating workability. There is.
[0027]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a piston member having a metal ring disposed in an annular hole so as to be reciprocally movable in an axial direction, and two regions separated by the metal ring are provided in two regions. In the piston member in which the pressing means for pressing the metal ring to the other region side is arranged and the position of the metal ring is adjusted by adjusting the pressing force of at least one pressing means, the metal ring is formed by press molding. A radial wall surface portion separating the two regions and a substantially cylindrical portion extending in the axial direction are formed, and a fitting portion into which a spring as the one pressing means is fitted to the radial wall surface portion A position that is formed so as to protrude in the extending direction of the cylindrical portion and that is adjacent to the substantially cylindrical portion in a radial direction different from the position where the fitting portion is formed in the radial wall surface portion. In, the extending direction of the symbolic cylindrical portion forms a projection projecting to the opposite side, so the size adjustment is performed is removed undulations only to a portion of the protrusion by crushing by a press, the distal end surface of該Tokki A dimensional reference surface from the tip surface to the axial end surface of the substantially cylindrical portion is used.
[0030]
Therefore, the dimension from the tip end face of the protrusion to the axial end face of the substantially cylindrical portion is adjusted by adjusting the process of the protrusion.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0032]
With reference to FIG. 1 and FIG. 2, the piston member which concerns on embodiment of this invention is demonstrated.
[0033]
FIG. 1 is a schematic configuration diagram of a piston member according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram illustrating a use state of the piston member according to an embodiment of the present invention.
[0034]
FIG. 2 shows a state in which the piston member according to the embodiment of the present invention is applied as a piston member for switching the clutch of the shift switching device of the automatic transmission for an automobile. The basic configuration and function of each part are the same as those described with reference to FIGS. 3 and 4 in the above description of the prior art, and therefore detailed description thereof will be omitted. Explained.
[0035]
In FIG. 2, 10 shows the whole power connection part (clutch part) of the automatic transmission, 1 is a metal ring formed by press molding and reciprocally moved in the annular hole, Reference numeral 20 denotes a housing, 30 denotes a multi-plate clutch, and 40 denotes a spring as pressing means.
[0036]
The metal ring 1 is moved in the axial direction by a control oil pressure (pressing means) introduced into the pressure chamber AR, whereby the clutch plate is crimped and the driving force is transmitted.
[0037]
Next, the piston member will be described in detail with reference to FIG.
[0038]
As shown in FIG. 1, the piston member is constituted by baking a rubber lip 3 on a metal ring 1 formed by press molding.
[0039]
As shown in the drawing, the metal ring 1 is roughly formed by press forming, a cylindrical portion 1a extending in the axial direction, an end surface portion 1b at the axial end of the cylindrical portion 1a, and two regions (a pressure chamber AR and an annular shape). An outer peripheral side radial wall surface portion 1c and an inner peripheral side radial wall surface portion 1d that are hermetically divided with a region KR) therebetween are formed.
[0040]
Here, the cylindrical portion 1a functions as a sliding portion with the inner periphery of the housing, the end surface portion 1b has a function of pressing the clutch plate, and the outer peripheral side radial wall surface portion 1c and the inner peripheral side radial wall surface. The section 1d mainly has a function of dividing the two areas.
[0041]
The sealing function is particularly exerted by the rubber lip 3 and the O-ring O in FIG.
[0042]
Moreover, in FIG. 1, 2 is a spring fitting part for fitting the spring 40 shown in FIG.
[0043]
And in this Embodiment, the protrusion 4 was provided in the outer peripheral side radial direction wall surface part 1c, It is characterized by the above-mentioned.
[0044]
The arrangement position, the number, the size, and the like of the protrusions 4 may be set as appropriate depending on the use environment, the material, and the like.
[0045]
And the front end surface of this protrusion 4 is used as the dimension reference surface of the metal ring 1 itself.
[0046]
That is, as described above, when applied as a piston member for switching operation of a clutch of a shift switching device of an automatic transmission for an automobile, the dimensional accuracy of the surface that pushes the clutch plate is functionally important. It becomes.
[0047]
Therefore, the distance L1 from the front end surface of the protrusion 4 provided on the outer peripheral radial wall surface portion 1c to the end surface portion 1b that presses the clutch plate, and the dimensional accuracy in which the deflection of the end surface portion 1b relative to the axis C affects the functionality. It becomes a factor of sex.
[0048]
Therefore, in this embodiment, when the swell due to the press work is generated, and the dimension needs to be adjusted for the above-described distance L1 and runout, the swell is removed by crushing the portion of the protrusion 4 by pressing. It becomes possible to adjust.
[0049]
Therefore, unlike the prior art, it is not necessary to crush the entire outer peripheral radial wall surface by pressing, and it is only necessary to crush only the portion of the protrusion 4 by pressing. Therefore, the workability is facilitated and the dimensional accuracy is improved without requiring additional processing such as the above.
[0050]
【The invention's effect】
As described above, the present invention is to mold the metal ring by press molding, provided with projections on the metal ring, the dimensions of the distal end surface of the projection, until the axial end face of the substantially cylindrical portion from the front end surface with reference plane, by the processing adjustment of the projection, it is possible to easily adjust the size of the distal end surface of the projection to the axial end face of the substantially cylindrical portion.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a piston member according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram showing a usage state of the piston member according to the embodiment of the present invention.
FIG. 3 is a schematic configuration diagram showing a main part of a power connection part (clutch part) of a conventional automatic transmission used in an automobile or the like.
FIG. 4 is a schematic configuration diagram of a piston member according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Metal ring 1a Cylindrical part 1b End surface part 1c Outer peripheral side radial direction wall part 1d Inner peripheral side radial direction wall part 2 Spring fitting part 3 Rubber lip 4 Protrusion 10 Power connection part (clutch part)
20 Housing 30 Multi-plate clutch 40 Spring

Claims (2)

A piston member provided with a metal ring disposed in an annular hole so as to be reciprocally movable in the axial direction,
In the two regions separated by the metal ring, a pressing unit that presses the metal ring toward the other region side is arranged, and the position of the metal ring is adjusted by adjusting the pressing force of at least one of the pressing units. In the piston member
The metal ring is formed by press forming a radial wall surface portion separating the two regions and a substantially cylindrical portion extending in the axial direction,
A fitting portion into which the spring as the one pressing means is fitted to the radial wall surface portion is formed so as to protrude in the extending direction of the substantially cylindrical portion, and the fitting portion is formed in the radial wall surface portion. A protrusion that protrudes in a direction opposite to the extending direction of the substantially cylindrical portion is formed at a position that is different in radial direction from the position that is adjacent to the substantially cylindrical portion, and only a portion of the protrusion is pressed by a press. A piston member, characterized in that the tip surface of the projection is used as a dimension reference surface from the tip surface to the axial end surface of the substantially cylindrical portion so that the swell is removed by crushing and the dimension adjustment is performed . A method of manufacturing a piston member including a metal ring that is disposed in an annular hole so as to be reciprocally movable in an axial direction,
In the two regions separated by the metal ring, a pressing unit that presses the metal ring toward the other region side is arranged, and the position of the metal ring is adjusted by adjusting the pressing force of at least one of the pressing units. In the manufacturing method of the piston member
A radial wall surface that separates the two regions, and a substantially cylindrical portion that extends in the axial direction, and the radial wall surface has a reference surface whose leading end surface extends to the axial end surface of the substantially cylindrical portion. A press molding step of forming the metal ring provided with a projection to be,
And a step of adjusting the dimensions by removing waviness by crushing the press only on the protrusions, and manufacturing the piston member.

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