JP3696714B2 - Integrated drum molding method having internal and external teeth - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an integrated drum forming method for forming an integrated drum having internal teeth and external teeth by a flow forming machine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, drum members shown in FIGS. 10 and 11, for example, have been known as drum members that respectively engage with a clutch plate of a two-multiplate clutch by a transmission mechanism of an automatic transmission.
[0003]
As shown in FIG. 10, this drum member is manufactured by press-molding a first drum having inner spline teeth and a second drum having outer spline teeth, respectively. The first drum and the second drum Are integrated by electron beam welding (FIG. 11).
[0004]
[Problems to be solved by the invention]
However, in the conventional drum member, two independent first drums and second drums are manufactured, and both drums are welded to form a drum member having internal teeth and external teeth. Therefore, there are problems listed below.
[0005]
(1) In manufacturing the drum member, the press molding process of the first drum, the press molding process of the second drum, and the electron beam welding operation of both the drums must be performed, so that the manufacturing time is increased.
[0006]
(2) The first and second drums are welded with an electron beam. After welding, there is an unwelded part because it is not possible to check the unwelded part by applying force to both drums at the manufacturing stage. There is a possibility that the drum member is supplied as a product, and in order to maintain high product quality, it is necessary to perform a welding operation while paying close attention.
[0007]
(3) Since the first drum and the second drum are welded by the electron beam, there is a welding distortion caused by material heating accompanying welding and an axial misalignment in which the axial centers of the first drum and the second drum are at least within a tolerance range. Inevitable, spline teeth are inclined due to welding distortion, and the gap between the clutch plate and the clutch plate cannot be kept constant due to axial misalignment.
[0008]
As a result, the clutch plate fitted to the spline teeth cannot move smoothly along the spline teeth when the clutch is engaged or released, and dragging occurs, or the clutch plate is fitted in an inclined state to cause plate wear. May cause uneven wear that is partially offset.
[0009]
In the above description of the prior art, an example in which a drum is manufactured by press molding has been described. However, as described in Japanese Patent Laid-Open No. 7-51781, recently, as a method of processing internal teeth with high accuracy and high strength, Flow forming is known.
[0010]
This flow forming is performed by cold plastic deformation in which the forming roller is pressed against the material, the rotating material is moved in the axial direction while maintaining a high pressing force, and the extruded material is poured into the inner internal mold. This is a processing method for forming internal teeth on the inner surface. Therefore, there is no spring back in the elastic deformation region as in press molding, and teeth can be molded with high precision, and fiber flow phenomena such as landslides and miniaturization of metal structure crystals occur, which is higher than the material. It becomes strength.
[0011]
Therefore, assuming that a drum member having internal teeth and external teeth is configured using a drum having internal teeth by flow forming described in FIG. Since the drum having teeth is separately formed and the two drums are integrated by welding, the above problem remains unsolved.
[0012]
The problem to be solved by the present invention is to ensure high product quality, prevent tooth inclination, and prevent axial misalignment between internal and external teeth, while achieving high accuracy and high strength internal and external teeth. An object of the present invention is to provide a method for forming an integral drum by short-time molding.
[0013]
[Means for Solving the Problems]
(Solution 1)
The solution 1 (Claim 1) of the above-mentioned problem 1 is an integrated type integrally including a first drum portion in which inner teeth are formed from a single circular plate member, a second drum portion in which outer teeth are formed, and a boss portion. In an integrated drum molding method for molding a drum,
The circular plate member is sandwiched between a mandrel having an inner tooth mold on the outer periphery and a pressure plate having an outer peripheral surface serving as an inner surface mold of the second drum portion, and the boss portion is formed by aligning the axial centers of the mandrel and the pressure plate. A plate material fixing step for clamping and fixing,
Using a material bending roller, a drum portion preforming step for preliminarily forming a portion to be the first drum portion and a portion to be the second drum portion from a rotating circular plate material;
An external tooth base surface forming step of forming an external tooth base surface on a portion to be a pre-formed second drum portion using a pressing roller;
Using two forming rollers arranged opposite to each other at the rotational axis symmetry position of the mandrel, the two rollers are pressed against the preformed first drum portion, and the first drum portion is moved in the axial direction while maintaining the roller pressing. A flow forming internal tooth forming step of forming internal teeth on the inner surface of the first drum portion by cold plastic deformation by flow forming;
Cold by rolling by using a backup roller that supports the external tooth die and the pressure plate arranged opposite to the external tooth base surface at positions opposite to the external tooth die, and moving the rotationally synchronized external tooth die in the radial direction. A rolling external tooth forming step of forming external teeth on the outer surface of the second drum portion by plastic deformation;
It is characterized by having.
[0014]
(Solution 2)
The solution 2 (Claim 2) of the above problem 2 is the integral drum forming method having internal teeth / external teeth according to Claim 1,
The outer diameter of the mandrel is set to be larger than the outer diameter of the pressure plate, the inner tooth forming die and the second drum part inner surface die having the same diameter as the outer diameter of the pressure plate are formed on the outer periphery of the mandrel, and the outer surface of the pressure plate is A two-drum axially projecting portion inner surface type is formed.
[0015]
(Solution 3)
The solution 3 (Claim 3) of the above problem 3 is the integral drum molding method having internal teeth / external teeth according to Claim 2,
An intermediate step wall is set between the inner tooth mold formed on the outer periphery of the mandrel and the second drum part inner surface mold,
In the external tooth base surface forming step, the gap is crushed by pressing the portion to be the pre-formed second drum portion in the radial direction using a pressing roller, and the inner side wall surface of the intermediate step wall and the second drum portion An external tooth base surface having an axial protruding portion protruding outward from the boss portion is formed by deforming in accordance with the shape of the inner surface mold and the axial protruding portion inner surface mold.
[0016]
(Solution 4)
The solving means 4 (Claim 4) of the above problem 4 is the integrated drum molding method having internal teeth / external teeth according to Claims 1 to 3,
The processes of the respective steps are performed in the order of plate material fixing step → drum portion preforming step → external tooth base surface forming step → rolling external tooth forming step → flow forming internal tooth forming step.
[0017]
(Solution 5)
The solving means 5 (Claim 5) of the above problem 5 is the integral drum forming method having internal teeth / external teeth according to Claims 1 to 4,
The inner teeth are spline teeth, the outer teeth are involute teeth, and the molded integrated drum is provided in the transmission mechanism of an automatic transmission that fits the clutch plates of two multi-plate clutches into the spline teeth and involute teeth, respectively. The present invention is characterized by being applied as a drum member.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
The first embodiment is an integrated drum forming method having internal teeth and external teeth corresponding to the inventions of claims 1 to 5.
[0019]
First, the configuration of the integrated drum will be described.
[0020]
FIG. 1 is a cross-sectional view showing an integrated drum having internal teeth and external teeth formed by the integrated drum forming method having internal teeth and external teeth according to Embodiment 1, and FIG. 2 shows internal teeth of the integrated drum. FIG. 3 is a view showing external teeth of the integrated drum, and FIG. 4 is an automatic transmission to which the integrated drum formed by the integrated drum forming method having the internal teeth and external teeth of the first embodiment is applied. It is sectional drawing which shows a transmission mechanism.
[0021]
As shown in FIG. 1, the integrated drum A is formed by using a single circular plate as a raw material, and is formed with a first drum portion 1 in which spline inner teeth 1a are formed and involute outer teeth 2a. The second drum portion 2 and the boss portion 3 extending in the radial direction from the second drum portion 2 are integrally formed. An intermediate step portion 4 is provided between the first drum portion 1 and the second drum portion 2. Is set.
[0022]
As shown in FIG. 2, the spline inner teeth 1a are formed with a plurality of trapezoidal teeth at equal intervals, and the involute outer teeth 2a are involute-shaped teeth at equal intervals as shown in FIG. A plurality are formed.
[0023]
As shown in FIG. 3, the integrated drum A is applied as a high clutch drum provided in a transmission mechanism of an automatic transmission.
[0024]
In FIG. 3, 5 is an input shaft, 6 is an oil pump cover, 7 is a reverse clutch drum connected to a sun gear of a front planetary gear (not shown), and A is an integral type as a high clutch drum connected to the input shaft 5. Drum, 8 is a band brake that is engaged at the second forward speed and the fourth speed, 9 is a reverse clutch (multi-plate clutch) that is engaged at the reverse stage, and 10 is a high clutch (multi-plate) that is engaged at the third forward speed and the fourth speed. Clutch), 11 is a reverse clutch piston, and 12 is a high clutch piston.
[0025]
The driven plate 10a of the high clutch 10 is fitted to the spline inner teeth 1a of the integrated drum A, and the drive plate 9a of the reverse clutch 9 is fitted to the involute outer teeth 2a of the integrated drum A.
[0026]
Next, the configuration of the integrated drum molding machine will be described.
[0027]
FIG. 5 is a schematic front view showing an integrated drum molding machine used in the integrated drum molding method of the first embodiment.
[0028]
In FIG. 5, 20 is a machine frame, 21 and 22 are swing arms, 23 and 24 are arm guides, 25 is a bending roller support slide base, 26 and 27 are roller support slide bases, 28 is a material bending roller, and 29 is forming. A roller, 30 is a backup roller, 31 is an external tooth die, 32 is a pressing and forming roller, and 33 is a mandrel.
[0029]
The mandrel 33 is fixed to a first forming shaft 34 (to be described later) that performs a rotating operation and a sliding operation that moves while maintaining the rotating shaft, and a material bending roller 28, a forming roller 29, a backup roller 30, and an external tooth die 31. And the pressing and forming roller 32.
[0030]
The rollers and the like used for each process are exchanged as necessary and moved in the radial direction by the swinging motions by the swinging arms 21 and 22 and the sliding motions by the support slide bases 25, 26, and 27. An amount is also given.
[0031]
Next, an integrated drum forming method having internal teeth and external teeth will be described.
[0032]
Prior to the description of the integrated drum molding method, the configuration of the molding material clamp will be described with reference to FIG.
[0033]
The mandrel 33 is set to have an outer diameter larger than the outer diameter of the pressure plate 36 and is fixed to the first molding shaft 34 via a die-cutting ring member 35. The molding die 33a is formed, the second drum part inner surface mold 33b is formed in a small diameter part having the same diameter as the outer diameter of the pressure plate 36, and an intermediate step is formed between the inner tooth molding die 33a and the second drum part inner surface mold 33b. A wall 33c is formed.
[0034]
The pressure plate 36 is fixed to a second molding shaft 38 via a synchronous gear 37, and an axially protruding portion inner surface die 36a of the second drum portion 2 is formed on the outer periphery thereof.
[0035]
Further, at the end portions of the mandrel 33 and the pressure plate 36, a centering convex portion 33d and a centering concave portion 36b which are fitted to each other are formed.
[0036]
The integral drum A is formed in the order of plate material fixing step → drum portion preforming step → external tooth base surface forming step → rolled external tooth forming step → flow forming internal tooth forming step. Hereinafter, each process will be described.
[0037]
[Plate material fixing process]
In the plate material fixing step, as shown in a portion below the axis O in FIG. 6, a circular plate material A ′ whose outer peripheral portion is slightly bent toward the mandrel 33 side, a mandrel 33 having an inner tooth mold 33a on the outer periphery, and an outer peripheral surface Is sandwiched between the pressure plate 36 which is the axially projecting portion inner surface mold 36a of the second drum portion 2, and the boss portion 3 is clamped and fixed by aligning the axial centers O of the mandrel 33 and the pressure plate 36. .
[0038]
In this plate material fixing step, the centering convex portion 33d and the centering concave portion 36b are fitted to make the axis O of the mandrel 33 and the pressure plate 36 coincide with each other, and the flat plate is deformed by applying clamping pressure to deform the boss portion 3. Shape.
[0039]
[Drum part preforming process]
In the drum portion preforming step, as shown in the portion above the axis O in FIG. 6, using the material bending roller 28, the rotating circular plate material A ′ is bent toward the mandrel 33, and the first drum portion 1 and The part which becomes and the part which becomes the 2nd drum part 2 are shape | molded preliminarily.
[0040]
[External tooth base surface forming process]
In the external tooth base surface forming step, as shown in FIG. 7, a pressing and forming roller 32 is used to press the preliminarily formed portion to be the second drum portion 2 in the radial direction, thereby crushing the gap, An external tooth base surface having an axial protruding portion that protrudes outward from the boss portion 3 by being deformed according to the shape of the inner diameter side wall surface of the wall 33c, the second drum portion inner surface mold 33b, and the axial protruding portion inner surface mold 36a. Mold.
[0041]
[Rolling external tooth forming process]
In the rolling external tooth forming step, as shown in FIG. 8, a backup roller 30 that supports an external tooth die 31 and a pressure plate 36 disposed opposite to the external tooth base surface at positions opposite to the external tooth die 31 is used. The external teeth 2 a are formed on the outer surface of the second drum portion 2 by cold plastic deformation by rolling by moving the rotationally synchronized external teeth die 31 toward the axis O in the radial direction.
[0042]
Here, the rotation synchronization of the external tooth die 31 is achieved by providing the external tooth die 31 on the rotary shaft 40 provided with the synchronous gear 39 that meshes with the synchronous gear 37.
[0043]
[Flow forming internal tooth forming process]
As shown in FIG. 9, the flow forming internal tooth forming step uses a forming roller 29 and a pressing and forming roller 32 that are arranged to face each other at the rotational axis symmetrical position of the mandrel 33, and is preliminarily formed with the first drum portion 1 (FIG. 8), the two rollers 29 and 32 are pressed from the end positions, and the first drum portion 1 is subjected to cold plastic deformation by flow forming that moves the first drum portion 1 in the axial direction while maintaining the roller pressure. Inner teeth 1a are formed on the inner surface.
[0044]
That is, the deformation of the plate material is plastic deformation that flows into the internal gear mold 33a by the movement while maintaining the roller pressure, and the internal teeth 1a are formed on the inner surface of the first drum portion 1 as the internal gear mold 33a. At this time, there is an overflow in which the plate material flows in the moving direction and a backflow in which the plate material flows in the direction of the second drum portion 2. The overflow portion is cut by post-processing, and the backflow portion is externally toothed by the intermediate step portion 4. 2a is absorbed without overlapping.
[0045]
Next, the effect will be described.
[0046]
(1) An integrated drum A having a first drum part 1 with internal teeth 1a formed therein, a second drum part 2 with external teeth 2a formed therein, and a boss part 3 are integrally formed from a single circular plate A ′. In the integrated drum forming method having internal teeth / external teeth, the axis O of the mandrel 33 and the pressure plate 36 are aligned and the boss portion 3 of the circular plate A ′ is clamped and fixed while rolling. Since the outer teeth 2a are formed on the outer surface of the second drum portion 2 by interplastic deformation and the inner teeth 1a are formed on the inner surface of the first drum portion 1 by cold plastic deformation by flow forming, ensuring high product quality Of the integrated drum A by the short-time molding having the high-precision and high-strength internal teeth 1a and external teeth 2a, while preventing the inclination of the teeth and preventing the axial misalignment between the internal teeth 1a and the external teeth 2a. A molding method can be provided.
[0047]
That is, since the two drums having the inner teeth and the outer teeth are not integrated by welding as in the prior art, the integrated drum A having the outer teeth 2a and the inner teeth 1a is processed by one clamp. , The problems due to welding are solved, high product quality is ensured, teeth are prevented from tilting, and axial misalignment between the inner teeth 1a and outer teeth 2a is achieved. Drum A can be manufactured.
[0048]
Moreover, since both the internal tooth 1a and the external tooth 2a are formed by cold plastic deformation, it can be set as a highly accurate and high-intensity tooth surface.
[0049]
(2) The outer diameter of the mandrel 33 is set larger than the outer diameter of the pressure plate 36, and the inner tooth forming die 33 a and the second drum portion inner surface die 33 b having the same diameter as the outer diameter of the pressure plate 36 are formed on the outer periphery of the mandrel 33. Since the axially protruding portion inner surface die 36a of the second drum portion 2 is formed on the outer periphery of the pressure plate 36, the inner surface die of the second drum portion 2 is obtained by the mandrel 33 and the pressure plate 36, and the inner surface of the second drum portion is obtained. Compared with the case where the mold is obtained by using only the pressure plate, it is possible to further increase the matching accuracy of the axis O of the inner tooth 1a and the outer tooth 2a.
[0050]
(3) An intermediate step wall 33c is set between the internal tooth forming die 33a formed on the outer periphery of the mandrel 33 and the second drum portion inner surface die 33b, and in the first and second drum portion pre-forming steps, Using the bending roller 28, the portion of the rotating circular plate A ′ that becomes the first drum portion 1 is bent toward the mandrel 33, and the portion of the bent plate that becomes the second drum portion 2 is the outer diameter of the intermediate step wall 33c. By deforming according to the shape of the side wall surface and the step surface, the mandrel 33 is bent with a gap with the second drum portion inner surface mold 33b, and in the external tooth base surface forming step, a pressing and forming roller 32 is used. By pressing the preformed second drum portion 2 in the radial direction, the gap is crushed, and the inner side wall surface of the intermediate step wall 33c, the second drum portion inner surface mold 33b, and the axially projecting portion inner surface mold 36a. Fits shape Since the external tooth base surface having an axial protrusion protruding outward from the boss portion 3 is formed by deforming the external teeth, the surplus accompanying plastic deformation when the external tooth die 31 is pushed into the external tooth base surface. A flow pattern in which the material of the minute part flows to the axial protruding portion is created, and the external teeth can be formed in an orderly manner, and the dimension control of the axial protruding amount after the external teeth can be formed.
[0051]
(4) Since each process is performed in the order of plate material fixing process → drum part preforming process → external tooth base surface forming process → rolling external tooth forming process → flow forming internal tooth forming process, After forming the internal teeth 1a, the inclination of the external teeth 2a caused by the axial offset positional relationship between the external tooth die 31 and the backup roller 30 during the formation of the teeth 2a is corrected by flow forming to form the internal teeth 1a. Compared to the case where the external teeth 2a are formed, it is possible to obtain the external teeth 2a with high accuracy in which the meshing shaft coincides with the rotation shaft.
[0052]
(5) The internal teeth are the spline internal teeth 1a, the external teeth are the involute external teeth 2a, and the formed integrated drum A is the plates 9a and 10a of the two clutches 9 and 10, respectively, the spline internal teeth 1a and the involute external teeth. Since it is applied as a high clutch drum provided in a transmission mechanism of an automatic transmission fitted to 2a, the plates 9a and 10a fitted to the inner teeth 1a and the outer teeth 2a are not inclined and set to the clutch 9, 10 can be smoothly moved along the inner teeth 1a and the outer teeth 2a at the time of engagement and release, clutch drag and plate uneven wear can be prevented, and durability reliability of the clutches 9 and 10 can be improved.
[0053]
(Other embodiments)
In the first embodiment, an example in which the integrated drum to be molded is applied as a drum member provided in the transmission mechanism of the automatic transmission has been shown, but it can be applied as a transmission mechanism of equipment other than the automatic transmission. Applicable to internal teeth and external teeth as gear teeth, two adjacent planetary gear sets with internal teeth as one sun gear and external teeth as the other ring gear, both gears connected by a rotating member Can do.
[0054]
In the first embodiment, an example of performing the rolling external tooth forming process → the flow forming internal tooth forming process has been shown, but conversely, the flow forming internal tooth forming process → the rolling external tooth forming process is performed in this order. Also good.
[0055]
In the first embodiment, the example in which the second drum portion and the boss portion are T-shaped has been described. However, the second drum portion may have an inverted L-shape extending in the axial direction from the end position of the boss portion.
[0056]
【The invention's effect】
According to the first aspect of the present invention, an integrated drum is integrally formed having a first drum portion in which internal teeth are formed, a second drum portion in which external teeth are formed, and a boss portion from a single circular plate. In the integrated drum forming method having internal teeth and external teeth, the flow is maintained while the axial center of the mandrel and the pressure plate are aligned and the boss portion of the circular plate member is clamped and fixed as described in claim 1. A method of forming internal teeth on the inner surface of the first drum portion by cold plastic deformation by forming and forming external teeth on the outer surface of the second drum portion by cold plastic deformation by rolling, that is, the outer teeth and the inner teeth The one-clamp processing method ensures high product quality, prevents tooth inclination, and prevents axial misalignment between the internal and external teeth, while ensuring high-precision and high-strength internal and external teeth. Provided is a method for forming an integrated drum by short-time molding. Can.
[0057]
According to a second aspect of the present invention, in the integrated drum forming method having the inner and outer teeth according to the first aspect, the outer diameter of the mandrel is set larger than the outer diameter of the pressure plate, Since the second drum part inner surface mold having the same diameter as the outer diameter of the tooth forming die and the pressure plate is formed, and the axially projecting portion inner surface mold of the second drum part is formed on the outer periphery of the pressure plate, Compared with the case where the inner surface mold of the drum portion is obtained by the mandrel and the pressure plate and the inner surface mold of the second drum portion is obtained only by the pressure plate, the accuracy of the axial alignment of the inner teeth and the outer teeth can be further increased.
[0058]
According to a third aspect of the present invention, in the integrated drum forming method having the inner teeth and the outer teeth according to the second aspect, the inner tooth forming mold formed on the outer periphery of the mandrel and the second drum portion inner surface mold An intermediate step wall is set between the two, and in the external tooth base surface forming step, a pressure roller is used to squeeze the gap by pressing the pre-formed second drum portion in the radial direction. This is because a method for forming an external tooth base surface having an axial protruding portion that protrudes outward from the boss portion by deforming in accordance with the shapes of the inner diameter side wall surface, the second drum portion inner surface mold and the axial protruding portion inner surface mold. In addition to the effect of claim 2, a flow pattern is created in which when the external tooth die is pushed into the external tooth base surface, surplus material accompanying plastic deformation flows into the axial protrusion, and the external teeth are formed in an orderly manner. Can and can Dimensional control of the axial projecting amount after the external teeth forming can also be performed.
[0059]
In the invention described in claim 4, in the integrated drum forming method having the internal teeth / external teeth according to claims 1 to 3, the process of each step is performed as follows: plate material fixing step → drum portion pre-forming step → The external tooth base surface molding process → Rolled external tooth molding process → Flow forming internal tooth molding process, so in addition to the above effects, the axial direction of the external die and the backup roller when molding external teeth by rolling The inclination of the external teeth caused by the offset positional relationship is corrected by flow forming that forms the internal teeth, and it is possible to obtain external teeth with higher meshing shaft accuracy than when forming the external teeth after forming the internal teeth first. it can.
[0060]
According to a fifth aspect of the present invention, in the integrated drum forming method having the inner teeth and the outer teeth according to any one of the first to fourth aspects, the inner teeth are formed as spline teeth and the outer teeth are formed as involute teeth. In addition to the above effects, in addition to the above effects, the internal drum is applied to the internal teeth and external teeth as the clutch drum of two multi-plate clutches is fitted to the spline teeth and the involute teeth. The clutch plate to be fitted is not inclined and can be moved smoothly along the inner and outer teeth when the multi-plate clutch is engaged or released, preventing clutch drag and uneven wear of the clutch plate, The durability reliability of the multi-plate clutch can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an integrated drum having internal teeth / external teeth formed by an integrated drum forming method having internal teeth / external teeth according to Embodiment 1;
FIG. 2 is a view showing internal teeth of an integrated drum.
FIG. 3 is a view showing external teeth of an integrated drum.
4 is a cross-sectional view showing a transmission mechanism of an automatic transmission to which an integrated drum formed by an integrated drum forming method having internal teeth and external teeth according to Embodiment 1 is applied. FIG.
5 is a schematic front view showing an integrated drum molding machine used in the integrated drum molding method of Embodiment 1. FIG.
6 is a process explanatory diagram of a plate material fixing step and a drum portion pre-forming step of the integrated drum forming method of Embodiment 1. FIG.
FIG. 7 is a process explanatory diagram of an external tooth base surface forming step of the integrated drum forming method of the first embodiment.
FIG. 8 is a process explanatory diagram of a rolling external tooth forming step of the integrated drum forming method according to the first embodiment.
FIG. 9 is a process explanatory diagram of a flow forming internal tooth forming process of the integrated drum forming method of the first embodiment.
FIG. 10 is a cross-sectional view showing a drum member for an automatic transmission according to a conventional molding method.
11 is an enlarged cross-sectional view showing an electron beam welded portion (B portion in FIG. 10) of a drum member for an automatic transmission according to a conventional forming method.
[Explanation of symbols]
A 'Circular plate material A Integrated drum 1 First drum part 1a Internal tooth 2 Second drum part 2a External tooth 3 Hub part 9 Reverse clutch (multi-plate clutch)
10 High clutch (multi-plate clutch)
28 Material bending roller 29 Forming roller 30 Backup roller 31 External tooth die 32 Pressing and forming roller 33 Mandrel 36 Pressure plate

Claims (5)

In an integrated drum forming method of forming an integrated drum integrally including a first drum portion in which internal teeth are formed from a single circular plate, a second drum portion in which external teeth are formed, and a boss portion,
The circular plate member is sandwiched between a mandrel having an inner tooth mold on the outer periphery and a pressure plate having an outer peripheral surface serving as an inner surface mold of the second drum portion, and the boss portion is formed by aligning the axial centers of the mandrel and the pressure plate. A plate material fixing step for clamping and fixing,
Using a material bending roller, a drum portion preforming step for preliminarily forming a portion to be the first drum portion and a portion to be the second drum portion from a rotating circular plate material;
An external tooth base surface forming step of forming an external tooth base surface on a portion to be a pre-formed second drum portion using a pressing roller;
Using two forming rollers arranged opposite to each other at the rotational axis symmetry position of the mandrel, the two rollers are pressed against the preformed first drum portion, and the first drum portion is moved in the axial direction while maintaining the roller pressing. A flow forming internal tooth forming step of forming internal teeth on the inner surface of the first drum portion by cold plastic deformation by flow forming;
Cold by rolling by using a backup roller that supports the external tooth die and the pressure plate arranged opposite to the external tooth base surface at positions opposite to the external tooth die, and moving the rotationally synchronized external tooth die in the radial direction. A rolling external tooth forming step of forming external teeth on the outer surface of the second drum portion by plastic deformation;
An integrated drum molding method having internal teeth and external teeth. In the integral drum molding method having the internal teeth and external teeth according to claim 1,
The outer diameter of the mandrel is set to be larger than the outer diameter of the pressure plate, an inner tooth forming die and a second drum part inner surface die having the same diameter as the outer diameter of the pressure plate are formed on the outer periphery of the mandrel, and the outer surface of the pressure plate is An integral drum forming method having internal teeth and external teeth, characterized in that an inner surface mold of axially projecting portions of two drum portions is formed. In the integral drum molding method having the internal teeth and external teeth according to claim 2,
An intermediate step wall is set between the inner tooth mold formed on the outer periphery of the mandrel and the second drum part inner surface mold,
In the external tooth base surface forming step, the gap is crushed by pressing the portion to be the pre-formed second drum portion in the radial direction using a pressing roller, and the inner side wall surface of the intermediate step wall and the second drum portion It has internal teeth and external teeth characterized by forming an external tooth base surface having an axial protruding portion that protrudes outward from the boss portion by being deformed according to the shape of the inner surface mold and the axial protruding portion inner surface mold. Integrated drum molding method. In the integral drum formation method which has the internal teeth and external teeth according to claim 1 to claim 3,
The internal teeth and external teeth are characterized in that the processing of each of the steps is performed in the order of plate material fixing step → drum portion pre-forming step → external tooth base surface forming step → rolled external tooth forming step → flow forming internal tooth forming step. An integrated drum molding method. In the integral drum molding method having the internal teeth / external teeth according to claim 1 to claim 4,
The inner teeth are spline teeth, the outer teeth are involute teeth, and a molded integrated drum is provided in a transmission mechanism of an automatic transmission that fits two multi-plate clutch clutch plates into the spline teeth and involute teeth, respectively. An integrated drum forming method having internal teeth and external teeth, characterized in that it is applied as a drum member.

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