JP2696528B2 - Method of manufacturing clutch outer of double hydraulic clutch and drum material with annular partition for clutch outer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of the Invention The present invention relates to a clutch outer of a dual hydraulic clutch, in particular, a boss supported on a transmission shaft and a drum surrounding the boss. And an annular partition connecting the outer peripheral surface of the boss and the inner peripheral surface of the drum to partition the drum into a pair of housings, each housing being adjacent to the annular partition to accommodate the piston in cooperation with the boss. Improvement of a clutch outer comprising a cylinder portion and a cylindrical portion connected to the cylinder portion to accommodate a clutch plate operated by a piston and having a spline on an inner peripheral surface, and a method of manufacturing a drum material with an annular partition for the clutch outer About.

(2) Conventional technology Conventionally, in this type of clutch outer, a drum and an annular partition wall are welded.

(3) Problems to be Solved by the Invention However, with the above configuration, when the clutch is turned on by operating the piston by supplying the hydraulic pressure into the cylinder portion, the pressing force of the piston and the corresponding reaction force are reduced. Due to this, there is a problem that stress concentration occurs at a welded portion between the drum and the annular partition wall, and thereby the durability of the clutch outer is impaired.

An object of the present invention is to provide a method for manufacturing the clutch outer and a drum material with an annular partition wall for the clutch outer, which can solve the above-mentioned problems.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a boss supported on a transmission shaft, a drum surrounding the boss, the boss outer peripheral surface and the boss. An annular partition wall connecting the inner peripheral surfaces of the drums to partition the drum into a pair of housings, each housing cooperating with the boss and a cylinder portion adjacent to the annular partition wall to accommodate a piston; In a clutch outer of a dual hydraulic clutch comprising a circumferential portion having a spline on an inner peripheral surface and connected to the cylinder portion to accommodate a clutch plate operated by the piston, the drum and the annular partition wall are joined. Forming a drum with an annular bulkhead by integrally forming it, welding the boss separate from the annular bulkhead to the annular bulkhead, and axially centering the outer peripheral surface of the drum,
A first feature is that annular concave portions having both ends in the axial direction are formed in a pair of cylinder portions sandwiching the annular partition wall.

Further, the present invention provides a boss supported on a transmission shaft, a drum surrounding the boss, an annular partition for continuously dividing the drum into a pair of housings between an outer peripheral surface of the boss and an inner peripheral surface of the drum. Each housing includes a cylinder portion adjacent to the annular partition for receiving a piston in cooperation with the boss, and is connected to the cylinder portion for receiving a clutch plate operated by the piston, and has an inner periphery. A dual hydraulic system comprising a cylindrical portion having a spline on its surface, and annular concave portions formed at a central portion in the axial direction of the outer peripheral surface of the drum with a pair of cylinder portions sandwiching the annular partition wall at both ends in the axial direction. It is used to obtain a drum with an annular partition wall constituting a clutch outer for a clutch,
In producing a drum material with an annular bulkhead in which the drum material without the spline and the annular bulkhead are integrally formed without a seam, mutually oppositely directed annular steps corresponding to the annular recesses are superimposed on each other in a superposed state. Using a pair of cylindrical forming dies for drum material, each having an inner peripheral portion corresponding to the annular partition wall on the outer peripheral portion of the metal annular plate material sandwiched between the end surfaces of the pair of cylindrical forming dies for drum material. A pair of annular split pieces is formed by making a cut that divides the thickness of the split piece over the entire circumference, and then the two split pieces are expanded to form a cylindrical portion made of the split pieces. By sequentially repeating the forming operation and the spreading operation, the diameter of the annular portion surrounded by the cylindrical portion is gradually reduced, and the bus bar of the cylindrical portion is gradually increased. Material and the dora The second feature to obtain the said annular partition wall that exists between consecutively has been both mold end surface to the material.

(2) Operation According to the clutch outer, when the clutch is turned on by operating the piston by supplying the hydraulic pressure into the cylinder portion, the drum and the annular partition wall are caused by the pressing force of the piston and the reaction force associated therewith. Even if stress concentration occurs at the connecting portion with the connecting portion, the connecting portion exhibits a sufficient strength because it has a seamless paired structure. On the other hand, since the boss does not receive the pressing force of each piston, there is no problem in strength even if it is separately welded to the annular partition.

In particular, since the annular concave portion is specially provided at the axial center portion of the outer peripheral surface of the drum, the splined cylindrical portion is continuously provided in each cylinder portion. While the required thickness (and thus rigidity) is ensured, waste at the center of the drum is reduced.

Further, according to the manufacturing method, a drum material having an annular partition wall for a clutch outer can be obtained in which a drum material and an annular partition wall are integrally formed seamlessly by repeating a cut forming operation and an expanding operation sequentially.

(3) Embodiment FIGS. 1 to 3 show a main part of an automatic multi-stage transmission of an automobile. A low-speed drive gear 2 and a high-speed drive gear 3 are rotatably supported on an input shaft 1 connected to an engine. A dual hydraulic clutch 4 is provided between the gears 2 and 3 so that they can be individually connected to the input shaft 1. The low-speed and high-speed drive gears 2 and 3 are engaged with low-speed and high-speed driven gears 5 and 6 fixed to an output shaft (not shown).

A clutch outer 7 of the dual hydraulic clutch connects a boss 8 spline-coupled to the input shaft 1 serving as a transmission shaft, a drum 9 surrounding the boss 8, and an outer peripheral surface of the boss 8 and an inner peripheral surface of the drum 9. The drum 9 to a pair of housings 10 ₁ ,
And an annular partition wall 11 for partitioning the 10 _2. Each housing 10 ₁ , 10 ₂ cooperates with a boss 8 to accommodate a cylinder portion 12 ₁ , 12 ₂ adjacent the annular partition 11 for receiving a piston, and a cylinder portion 12 for receiving a clutch plate actuated by the piston.
_1, 12 contiguous to _2, the spline 13 _1, 13 cylindrical portion 14 ₁ with _2, 14 ₂ and the more the inner peripheral surface and. A pair of cylinder portions 12 sandwiching an annular partition 11 is provided at an axially central portion of the outer peripheral surface of the drum 9.
An annular concave portion 9c is formed in each of the _first and _second ends, in which both ends in the axial direction are located.

The drum 9 and the annular partition 11 are integrally formed seamlessly to form a drum D with an annular partition, and the boss 8 separate from the annular partition 11 is welded to the annular partition 11.

Each cylinder unit 12 _1, 12 _2, the piston 16 _1, 16 ₂ to define a hydraulic pressure chamber 15 _1, 15 ₂ below the boss 8 cooperation is slidably fitted.

A plurality of drive clutch plates 17 ₁ , 17 ₂ and a pressure receiving plate 1 opposed to the pistons 16 ₁ , 16 ₂ with these cylindrical portions 14 ₁ , 14 ₂ interposed therebetween.
8 ₁ , 18 ₂ are slidably engaged with the spline. At this time, buffer springs 19 ₁ , 19 ₂ are provided between the pistons 16 ₁ , 16 ₂ and the drive clutch plates 17 ₁ , 17 ₂ adjacent thereto. Inserted. Pressure plate 18 ₁ , 1
8 ₂ is prevented from moving outward in the axial direction by a cylindrical plate 14 _1, 14 stop ring 20 ₁ is locked to _2, 20 _2.

Aitonaru drive clutch plate 17 _1, 17 ₂ and the pressure receiving plate 18 _1, 18 ₂ each between the driven clutch plates 21 _1, 21 ₂ is interposed, these driven clutch plates 21 _1, 21 _2, corresponding Clutch inners 22 ₁ and 2 integrally connected to one side of low-speed and high-speed drive gears 2 and 3
2 ₂ sliding is freely spline engaged to.

The retainer 23 _1, 23 ₂ is locked at both ends of the boss 8,
These retainers 23 ₁ and 23 ₂ and the piston 1 facing them
Between 6 _1, 16 _2, the spring 24 _first return emits bullet these pistons 16 _1, 16 ₂ to the backward direction, 24 ₂ is mounted under compression.

In the above, the left half of the clutch outer 7, the clutch inner 22 ₁ , the piston 16 ₁ , the clutch plates 17 ₁ and 21 ₁ , and the pressure receiving plate 1
8 ₁ and the return spring 24 ₁ constitutes the low-speed clutch 4 _1, also the right half portion of the clutch outer 7, a clutch inner 22 _2, the piston 16 _2, the clutch plate 17 _2, 21 _2, the pressure receiving plate 18 ₂ and the return spring 24 ₂ constitute a high-speed clutch 4 _2.

Timely pressure oil is adapted to be fed through two clutches 4 _1, 4 ₂ of the hydraulic chamber 15 _1, 15 oil passage 25 ₁ which is provided to the input shaft 1 to _2, 25 _2.

And Thus, if supply pressure oil to the hydraulic chamber 15 ₁ of the low-speed clutch 4 _1, the piston 16 ₁ driving and driven clutch plates 17 ₁ against the force of the spring 24 ₁ back receiving the hydraulic pressure 21 ₁ The pressure plate 18 ₁
Pressed against the, since they frictionally coupled, low-speed clutch 4 ₁ is turned on. Therefore, the rotational torque of the input shaft 1 is transmitted to the low-speed drive gear 2 via the low speed clutch 4 _1, and drives the output shaft (not shown) through a low speed driven gear 5.

Further, if supply pressure oil to the hydraulic chamber 15 ₂ of the high speed clutch 4 _2, Part clutch 4 ₂ is turned on, the rotational torque of the input shaft 1 will be transmitted from the high-speed drive gear 3 to the high-speed driven gear 6.

The low speed, the high speed clutch 4 _1, 4 ₂ in the ON state,
Piston 16 _1, 16 stress concentration in the connecting portion a between the _second pressing force and drum 9 and the annular partition wall 11 due to the reaction force associated therewith occurs, the coupling portion a is a unitary structure without seams Thus, the durability of the clutch outer 7 can be greatly improved.

Since the boss 8 does not receive the pressing force of the pistons 16 ₁ and 16 ₂ , there is no problem in strength even if the boss 8 is separately welded to the annular partition wall 11. is there. In addition, since the boss 8 has a unique function of guiding the sliding of the pistons 16 ₁ and 16 ₂ , the boss 8 is made as a separate material as described above so as to meet the function as a constituent material. Can be selected.

Figure 4 shows the annular partition wall with the drum material Do used in the production of the drum D with annular partition wall, it is a spline 13 _1, 13 ₂ no drum material 9 ₀ and the annular partition wall 11 on the inner peripheral surface seamlessly It is configured integrally.

Hereinafter, a method for producing the drum material Do with an annular partition will be described.

In FIG. 5, a pair of cylindrical molding dies 26 for a drum material is used.
_{The first} and _second 262 are configured so as to be able to freely contact and separate on the same axis, and can rotate in the same direction about the axis thereof. Both molds 26 _1, 26 end face 27 ₁ facing each of _2, 27 ₂ of diameter substantially equal to the diameter of the annular partition wall 11. One of the mold 26 _{and second} end faces 27 ₂ the positioning projections 28, and the other mold 26 _first end face 27 positioning recesses 29 capable of fitting the positioning projections 28 ₁ are respectively provided. The outer peripheral surfaces of the _two molds 26 ₁ and 262 form a drum molding surface in a state where they are superimposed on each other, and therefore, the outer peripheral surfaces thereof have opposite annular step portions corresponding to the annular concave portion 9c. 26c ₁ and 26c ₂ are formed.

First, the central hole of the metal annular plate 30 having a larger diameter than the end faces 27 _1, 27 ₂ of the diameter as shown in FIG. 5 (a)
31 is fitted into the positioning projection 28 of one of the molds 26 ₂ , and then both molds 26 ₁ and 26 ₂ are moved in a direction approaching each other,
Of the plate 30 between the end faces 27 _1, 27 ₂ with fitting the positioning projection 28 and positioning recess 29, to sandwiched the inner peripheral portion 30a corresponding to the annular partition wall 11. Plate 30 projecting from both end surfaces 27 ₁ and 27 ₂
Protruding length of the outer peripheral surface 30b in is approximately half the length of the drum material 9 _0.

As shown in FIG. 5 (b), while the two mold 26 _1, 26 ₂ and plate 30 is rotated in the same direction, the rotating cutter 32 cuts c which bisects the thickness of the outer peripheral portion 30b of the plate 30 put over the entire circumference to form a pair of annular split pieces 33 _1, 33 _2.

As shown in FIG. 5 (c), the two molds 26 ₁ , 26 ₂
Insert the rollers 3 in the cut c while rotating, then is reciprocated rotating roller 34 on both mold 26 _1, 26 ₂ in the axial direction, thereby the both split pieces 33 _1, 33 ₂ them pushed apart becomes the dividing piece 33 _1, 33 _2, and forming the cylindrical portion 36 surrounding the annular portion 35.

As shown in FIG. 5 (d), the diameter of the annular portion 35 is gradually reduced and the bus bar of the cylindrical portion 36 is gradually increased by successively repeating the cut forming operation and the expanding operation. 26 _1, 26 a drum material 9 ₀ that follows the outer peripheral surface of _2, the drum material 9 ₀ to consecutively has been both molds 26 _1, 26 ₂ of the end face 2
The annular partition 11 existing between 7 ₁ and 27 ₂ is obtained.

Figure 6 is the inner peripheral surface of the drum material 9 _0, splines
The molding apparatus used for molding 13 ₁ and 13 ₂ is shown.

The apparatus includes an upper mold 37 ₁ and the lower mold 3 facing each
A 7 _2, both types 37 _1, 37 ₂ and the inner punch 38 _1, 38 _2, the more the die 39 _1, 39 ₂ of the outer. Each punch 38 _1, 38 ₂ has a tooth portion 40 _1, 40 ₂ corresponding to the spline 13 _1, 13 ₂ on the outer circumferential surface and having an outside diameter capable of fitting into the drum material 9 _0. And each die 39 _1, 39 ₂ has a slightly smaller inner diameter than the outer diameter of the drum material 9 _0.

In the forming operation, both punches 38 ₁ and 38 ₂ are
_The annular partition 11 is fitted to both halves of
To sandwiched between 8 _1, 38 ₂ of the end face.

Lowered upper die 39 ₁ and ironing the halves of the drum material 9 ₀ by increasing the die 39 ₂ lower, thereby extra caused by its diameter and at the same time reducing the diameter of the halves obtaining a spline 13 _1, 13 ₂ material crowded flow to both the punch 38 _1, 38 each groove 41 ₁ of _2, 41 between _2.

C. Effects of the Invention According to the invention described in the item (1), by forming the drum and the annular partition wall seamlessly and integrally, it is possible to provide a clutch outer having excellent durability. In addition, by forming the boss separately from the annular partition wall, the workability of the boss can be improved, and a material suitable for the function can be selected as a constituent material of the boss.

In addition, in particular, in the axial center portion of the drum outer peripheral surface, since a pair of cylinder portions sandwiching the annular partition wall is formed with annular recesses whose axial ends are respectively located, a cylindrical portion with a spline is continuous with each cylinder portion, While ensuring the required thickness (and thus rigidity) of each of the cylindrical portion and the cylinder portion, the waste of the drum central portion is reduced, and the weight of the clutch outer can be reduced as a whole.

Further, according to the invention described in (2), the drum material with an annular partition wall for the clutch outer can be easily manufactured.

[Brief description of the drawings]

1 to 3 show a double hydraulic clutch, FIG. 1 is a front view of the entire longitudinal section, FIGS. 2 and 3 are lines II-II and III-I of FIG.
FIG. 4 is a vertical sectional front view of the drum material with an annular partition, FIG. 5 is an explanatory view of a manufacturing process of the drum material with an annular partition,
FIG. 6 is a vertical sectional front view of the spline forming apparatus. c ...... cut, D ...... annular partition wall with the drum, Do ...... annular partition wall with the drum material, 1 ...... input shaft (transmission shaft), 4 ...... duplex hydraulic clutch, 4 _1, 4 ₂ ...... slow, High speed clutch, 7 ...
... Clutch outer, 8 ... Boss, 9 ... Drum, 9c ...
Annular recess 9 ₀ ...... drum material, 10 _1, 10 ₂ ...... housing, 11 ...... annular partition wall, 12 _1, 12 ₂ ...... cylinder unit, 13 _1, 13 ₂
…… Spline, 14 ₁ , 14 ₂ … Cylindrical part, 16 ₁ , 16 ₂ … Piston, 17 ₁ , 17 ₂ … Drive clutch plate, 21 ₁ , 21 ₂ … Driven clutch plate, 26 ₁ , 26 ₂ …… Mold, 26c ₁ , 26c ₂ … Circular step, 27 ₁ , 27 ₂ … End face, 30… Plate, 30a, 30b… Inner, outer circumference, 33 ₁ , 33 ₂ … Split piece, 35 ... annular part, 36 ... cylindrical part

Claims (2)

(57) [Claims] A boss supported on a transmission shaft, a drum surrounding the boss, an annular partition wall connecting the outer peripheral surface of the boss and the inner peripheral surface of the drum to partition the drum into a pair of housings; Each housing includes a cylinder portion adjacent to the annular partition for receiving a piston in cooperation with the boss, and is connected to the cylinder portion for receiving a clutch plate operated by the piston, and has an inner periphery. In a clutch outer of a dual hydraulic clutch comprising a circumferential portion having a spline on a surface thereof, the drum and an annular partition are integrally formed seamlessly to form a drum with an annular partition, and the annular partition has a drum. It is characterized in that the separate bosses are welded, and annular concave portions are formed at the axially central portion of the outer peripheral surface of the drum in a pair of cylinder portions sandwiching the annular partition wall, with both axial ends located respectively. This is the clutch outer of the dual hydraulic clutch. 2. A boss supported on a transmission shaft, a drum surrounding the boss, an annular partition wall connecting the outer peripheral surface of the boss and the inner peripheral surface of the drum to partition the drum into a pair of housings. Each housing includes a cylinder portion adjacent to the annular partition for receiving a piston in cooperation with the boss, and is connected to the cylinder portion for receiving a clutch plate operated by the piston, and has an inner periphery. A dual hydraulic system comprising a cylindrical portion having a spline on its surface, and annular concave portions formed at a central portion in the axial direction of the outer peripheral surface of the drum with a pair of cylinder portions sandwiching the annular partition wall at both ends in the axial direction. It is used to obtain a drum with an annular partition that constitutes a clutch outer for a clutch, and a drum material having no spline and an annular partition are integrally formed seamlessly. In producing the drum material with the partition walls, a pair of cylindrical molding dies for the drum material each having, on the outer circumference, mutually opposite annular step portions corresponding to the annular recesses in a superposed state are used, and the annular partition walls are used. In the outer peripheral portion of the metal annular plate material sandwiched between the end faces of the pair of drum-shaped cylindrical molding dies, a cut that divides the thickness of the metal annular plate material into two is inserted over the entire circumference. Form a pair of annular split pieces, then expand both split pieces to form a cylindrical part consisting of those split pieces,
Thereafter, by sequentially repeating the cut forming operation and the push-out operation, the diameter of the annular portion surrounded by the cylindrical portion is gradually reduced, and the bus bar of the cylindrical portion is gradually increased. A method of manufacturing a drum material with an annular partition for a clutch outer of a dual hydraulic clutch, wherein the drum material and the annular partition provided between the end faces of both molds connected to the drum material are obtained.