JP3079242B2 - Method of manufacturing piston material for clutch and ironing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a friction type multi-plate clutch,
Piston material used in the production of clutch pistons for automatic transmission clutches, etc., in particular, formed on the outer peripheral edge of the disk part to be thicker than the disk part and slides on the inner peripheral surface of the outer cylinder part of the clutch housing The present invention relates to a method of manufacturing a clutch piston material having rim portions connected in series and an ironing device used in the manufacturing process.

[0002]

2. Description of the Related Art Conventionally, a casting method or a hot forging method has been applied to the production of such a piston material.

[0003]

However, all of the above-mentioned conventional methods have a problem that the workability of the production is poor because the piston material must be manufactured at a high temperature.

[0004] In view of the above, it is an object of the present invention to provide a manufacturing method and an ironing apparatus capable of solving the above-mentioned problem by manufacturing the piston material by cold plastic working. .

[0005]

According to the present invention, a rim portion which is formed thicker than the disk portion and slides on the inner peripheral surface of the outer cylinder portion of the clutch housing is continuously provided on the outer peripheral edge of the disk portion. In producing the clutch piston material, a disk-shaped blank is subjected to drawing to form a first annular convex edge, and on one surface of the blank surrounded by the first annular convex edge,
A step of extruding a continuous portion with the first annular convex edge to form a second annular convex edge continuous with the first annular convex edge on the other surface of the blank; Forming the rim portion by ironing and sequentially forming the disc portion.

According to the present invention, ironing is performed on the first and second annular convex edges of a blank having a pair of first and second annular convex edges which are continuous with each other and project in opposite directions from each other on the outer peripheral portions of both surfaces. To manufacture a clutch piston material having a rim portion which is provided continuously with the outer peripheral edge of the disk portion and which is formed thicker than the disk portion and slides on the inner peripheral surface of the outer cylinder portion of the clutch housing. An ironing device for having a blank clamping surface for clamping a region inside the first and second annular convex edges of the blank, and facing the first and second annular convex edges. In order to form a rim molding cavity that allows the outer peripheral portions of the annular convex edges to protrude outward in the radial direction, a punch composed of a pair of opposing punch halves, and the punch fitted with the punch, The first and second annular protruding edges can be plastically deformed Characterized in that it comprises a pushing die to said rim portion molding cavities by.

[0007]

In the above manufacturing method, since the piston material is manufactured by cold plastic working, the workability of manufacturing the piston material is good.

According to the ironing apparatus, the rim can be easily formed with high precision.

[0009]

1 shows a clutch 1 for an automatic transmission. The cylindrical clutch housing 2 includes an outer cylindrical portion 3 that is disposed concentrically.
In addition, an annular end wall portion 5 is continuously provided between one ends of the inner cylindrical portion 4, and a hollow drive shaft 6 is continuously provided coaxially with the inner cylindrical portion 4 on the outer surface of the annular end wall portion 5. The drive shaft 6 is supported by a casing 8 via a bearing 7. A disc-shaped piston 9 is slidably fitted between the inner peripheral surface of the outer cylindrical portion 3 and the outer peripheral surface of the inner cylindrical portion 4, and a hydraulic chamber 10 is defined between the piston 9 and the end wall portion 5. Is done. A return spring 11 is connected to the piston 9, and the return spring 11 urges the piston 9 in a clutch disengaging direction. A plurality of drive clutch plates 14 and driven clutch plates 15 are alternately arranged between the inner peripheral surface of the outer cylindrical portion 3 and the outer peripheral surface of the cylindrical portion 13 of the driven member 12. Each drive clutch plate 14 is spline-coupled to the inner peripheral surface of the outer cylindrical portion 3, and each driven clutch plate 15 is spline-coupled to the outer peripheral surface of the cylindrical portion 13.

In the above configuration, when hydraulic pressure is supplied to the hydraulic chamber 10, the piston 9 moves forward by the hydraulic pressure, and the drive clutch plate 14 is pressed against the driven clutch plate 15 to connect the clutch 1, whereby the drive shaft 6 Driven member 12
Power is transmitted to. On the other hand, when the supply of the hydraulic pressure to the hydraulic chamber 10 is released, the piston 9 retreats due to the elastic force of the return spring 11, and the clutch 1 is disconnected, whereby the power transmission is released.

The piston 9 is an annular disk-shaped piston body 1
6 and a rim portion 1 which is connected to the outer peripheral edge of the piston body 16 and slides on the inner peripheral surface of the outer cylindrical portion 3 of the clutch housing 2
7 and a boss 18 connected to the inner peripheral edge of the piston main body 16 and sliding on the outer peripheral surface of the inner cylinder 4 of the clutch housing 2. The piston body 16 has a truncated conical stopper 19 protruding on the opposite side to the boss 18 at a portion connected to the boss 18, and the stopper 19 abuts on the annular end wall 5 of the clutch housing 2. In contact therewith, the retraction limit of the piston 9 is restricted. Further, the piston body 16 is
And a plurality of arc-shaped pressing projections 20 that face each other, and these pressing projections 20 are arranged on the same circumference. Rim 17
Is formed thicker than the piston body 16, and has an annular end face opposed to the drive clutch plate 14 and each pressing projection 2.
The 0 arcuate end faces are substantially on the same plane, and when the clutch 1 is connected, the rim portion 17 and each pressing protrusion 20 cooperate to press the drive clutch plate 14. Each pressing protrusion 20 also functions as a reinforcing portion of the piston 9. An annular groove 22 for mounting the seal member 21 is provided on the outer peripheral surface of the rim portion 17.
An annular groove 24 on which the seal member 23 is mounted is provided on the inner peripheral surface 8.

In manufacturing the piston 9, the first piston material is formed by cold plastic working, then the second piston material is formed from the first piston material by cold plastic working, and then the second piston material is formed. Of machining the piston material.

2 (a) to 2 (c) show a first piston material forming step. In the step (a), a disc-shaped blank 26 having a central hole 25 is manufactured, and the step (b) is carried out. in, first molding the annular tongue 27 ₁ blank 26, also formed into a thin frustoconical projection 28 which projects the lower hole 25 periphery thereof to the first annular convex edge 27 ₁ and the same direction, further first Annular convex edge 2
7 ₁ is formed one side 29 opposite the first on the side of the other surface 30 annular convex edge 27 second annular convex edge 27 ₂ continuous to ₁ projecting,
In the step (c), the rim portion 17 is formed and the disc portion 31 is formed.
To obtain a _first piston blank 321.

FIG. 2D shows the second piston blank 32 _2.
Are shown, this is obtained by forming the boss 18 and the piston body 16 is subjected to press working to the first piston element 32 _1.

FIG. 3 shows a drawing / pressing device 33 used in the step of FIG. 2B. The device 33 includes a punch 35 attached to the lower surface of an upper holder 34 that can be raised and lowered, and a die 37 disposed on the upper surface of a fixed lower holder 36. The punch 35 has an annular convex portion 39 on the outer periphery of the molding surface 38. The die 37 includes an annular fixing portion 40 and a movable portion 42 slidably fitted in a die hole 41 of the fixing portion 40. The movable portion 42 has a molding die surface 43 facing the molding die surface 38 of the punch 35, and an annular concave portion 44 disposed on the outer periphery thereof and facing the projection 39 of the punch 35.
Having. Reference numeral 45 denotes a guide rod of the movable portion 42, which is slidably fitted in a guide hole 46 of the lower holder 36.

FIG. 5 shows an ironing apparatus 47 used in the step of FIG. The device 47 comprises a punch 48,
A die 50 having a die hole 49 fitted with the punch 48 is provided. Punch 48 is opposed to over the pair consists of a lower punch half 48 _1, 48 _2, the upper punch half 48 ₁ is attached to the upper holder 51 the lower surface of the vertically movable, while the lower punch half 48 ₂ Is supported by a guide rod 54, and the guide rod 54 is
The second guide hole 53 is slidably fitted. Both punch halves 48 _1, 48 ₂ has a blank clamping surfaces 55 and 56,
They have annular notches 57, 58 on their outer circumference. The cavities 5 for forming the rim are formed by the notches 57, 58.
9 is formed.

The die 50 is disposed on the upper surface of the lower holder 52, and the die hole 49 has an annular forming hole 60 in the middle portion for fitting with the punch 48, and the upper side of the forming hole 60 faces upward. The lower side is formed in a tapered hole part whose diameter is increased downward, and the lower side is formed in a tapered hole part whose diameter is expanded downward.

[0018] hitting the first manufacturing the piston material 32 _1, in FIGS. 2 (a) step, to manufacture a blank 26 is subjected to punching the material sheet.

In the step of FIG. 2B, as shown in FIG. 3A, the blank 26 is placed on the molding die surface 43 of the movable part 42 of the die 37. At this time, blank 26
Is located above the fixed portion 40. Next, the punch 35 is lowered, and the convex portion 39 is brought into contact with the blank 26 to lower the movable portion 42. Due to its lowered, since a drawing process on the outer periphery of the blank 26 by the punch 35 and the die 37 in cooperation is performed, the first annular convex edge 27 ₁ is formed in the blank 26.

Then, as shown in FIGS. 3B and 4,
When the movable portion 42 comes into contact with the lower holder 36, the blank 2
Sixth first annular convex edge 27₁Smell on one side 29 surrounded by
And the first annular convex edge 27₁Connecting part with the convex part 39
The other surface of the blank 26 is extruded toward the concave portion 44.
30, a first annular convex edge 27;₁2nd annular convex edge 27 which continues to
_TwoIs molded. The blank 26 is provided with both mold surfaces 3
The projections 28 are formed by the cooperation of 8, 43.

In the step shown in FIG. 2C, as shown in FIGS. 5A and 6, the lower punch half 48 ₂ of the punch 48 is used.
The blank 26 is placed on the blank holding surface 56 of the
Placed in the annular tongue 27 ₁ downward. Next, the upper punch half 48 ₁ is lowered to move the upper and lower punch half 48 ₁ down.
_1, by both the blank clamping surfaces 55, 56 of the 48 _2, the first blank 26 is clamped to a region inside the second annular convex edge 27 _1, 27 _2. The rim molding cavity 59 is
It is formed so as to face the first and second annular convex edges 27 ₁ and 27 ₂ and to allow the outer peripheral portions of the annular convex edges 27 ₁ and 27 _{2 to} project outward in the radial direction.

As shown in FIG. 5B, both punch halves 4
8 ₁ and 48 ₂ are lowered, and the first and second annular convex edges 27 ₁ and 27 ₂ are ironed while the cavities 59 forming portions are fitted into the annular forming holes 60 of the die holes 49 and pass therethrough. , And is pushed into the cavity 59, whereby the rim portion 17 is formed, and at the same time, the disk portion 31 is formed.

[0023] than the first piston material 32 ₁ produced in this way, FIG. 2 (d) a second piston material 32 ₂ through a step is obtained, the machining on the second piston material 32 ₂ This forms annular grooves 22, 24 and the like.

[0024] In the FIG. 2 (b) step, it is also possible to mold the first annular convex edge 27 ₁ after forming the second annular convex edge 27 _2.

[0025]

According to the manufacturing method of the present invention, since the piston material is manufactured by cold plastic working, the manufacturing efficiency of the piston material can be improved.

Further, according to the ironing apparatus of the present invention, the rim portion can be accurately and easily formed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a clutch for an automatic transmission.

FIG. 2 is a process explanatory view of one embodiment.

FIG. 3 is a sectional view of a main part of a drawing and pressing apparatus for forming first and second annular convex edges, wherein (a) shows a state before forming;
(B) shows the state after molding.

FIG. 4 is an enlarged view of a portion indicated by an arrow 4 in FIG. 3 (b).

5A and 5B are cross-sectional views of main parts of an ironing device for forming a rim portion, wherein FIG. 5A shows a state before forming, and FIG. 5B shows a state after forming.

FIG. 6 is an enlarged view of a portion indicated by an arrow 6 in FIG.

[Explanation of symbols]

2 Clutch housing 3 Outer cylinder 17 Rim 26 Blank 27 ₁ , 27 ₂ First and second annular protruding edges 29 One surface 30 Other surface 31 Disk portion 32 ₁ First piston material 33 Squeezing and pressing device 47 Ironing 48 punch 48 _1, 48 ₂ on the lower punch half 55, 56 blank clamping surface 59 the rim portion molding cavity

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-179029 (JP, A) JP-A-3-151131 (JP, A) JP-A-6-10969 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B21D 53/88 B21D 22/30 F16D 25/06 B21D 53/84 B21D 53/86

Claims (2)

(57) [Claims] A rim formed on the outer peripheral edge of the disk portion (31) so as to be thicker than the disk portion (31) and sliding on the inner peripheral surface of the outer cylindrical portion (3) of the clutch housing (2). Department (17)
In producing the piston material for clutches with
The disk-shaped blank (26) is drawn to form a first annular protruding edge (27 ₁ ) and the first annular protruding edge (27 ₁ ).
One side (29) of the blank (26) surrounded by ₁ )
, A continuous portion with the first annular convex edge (27 ₁ ) is extruded to form a second annular convex edge continuous with the first annular convex edge (27 ₁ ) on the other surface (30) of the blank (26). (27 ₂₎
Forming the first and second annular projections (27 ₁ ,
27 ₂ ) a step of forming the rim portion (17) by ironing and sequentially forming the disc portion (31). 2. An outer peripheral portion on both sides (29, 30),
And a pair of first and second annular protrusions projecting in opposite directions to each other.
Rim (27₁, 27_Two) Having a blank (26)
First and second annular projections (27₁, 27_Two) Ironing process
And is continuously provided on the outer peripheral edge of the disc portion (31).
The clutch housing is formed thicker than the disk portion (31).
Rim (1) that slides on the inner peripheral surface of the outer cylindrical portion (3) of the ring (2)
7) clutch piston material (32)₁Manufacture)
An ironing apparatus for performing the blanking (2
6) The first and second annular projections (27)₁, 27_Two)Than
Clamping surface (55, 56) that clamps the inner area
And the first and second annular ridges (27₁, 2
7_Two) And the annular convex edges (27₁, 27_Two)
Rim that allows the outer periphery of the nose to protrude radially outward
To form a molding cavity (59),
Twin punch halves (48₁, 48_Two) Punch (4)
8) and the first and second fittings by fitting with the punch (48).
Annular convex edge (27 ₁, 27_Two) To plastically deform
By pressing into the rim molding cavity (59)
And a ladder comprising:
Processing equipment.