JP6119543B2 - Hub member manufacturing method and hub member - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hub member manufacturing method and a hub member, and more specifically, a hub member manufacturing method that constitutes a friction engagement element together with a plurality of friction plates spline-fitted on the outer periphery, and a plurality of spline-fitting on the outer periphery. The present invention relates to a hub member that constitutes a friction engagement element together with the friction plate.

  Conventionally, as a manufacturing method of a multi-plate clutch carrier used in an automatic transmission or the like, a tooth-like groove is formed so that inner and outer surfaces of a tooth tip and a tooth base extend parallel to an axial direction with respect to a blank. There has been proposed a method of manufacturing a multi-plate clutch carrier by forming a flange wall directed radially inward at one end in the axial direction on the inner side (see, for example, Patent Document 1). In this manufacturing method, after forming the dentition-like groove, the outer surface of the tooth tip is formed by forming a flange wall by striking from the outside using a plunger having a width smaller than the width of the tooth tip of the dentition-like groove. The edges of the are not processed.

Special table 2007-504953 gazette

  In such a multi-plate clutch carrier, generally, a plurality of clutch plates are spline-fitted on the outer periphery, and the inner peripheral side hydraulic oil can be supplied to the plurality of clutch plates via a communication hole that connects the inner peripheral side and the outer peripheral side. Configured as follows. The above-described saddle wall is formed to prevent the oil (oil film) inside the multi-plate clutch carrier from moving to the end face side in the axial direction and flowing out to the outside when the vehicle is traveling. When this ridge wall is formed by the above-described method for manufacturing a multi-plate clutch carrier, the tooth side surface (tooth surface) of the dentition-like groove may swell relatively greatly outward when the ridge wall is formed. If the tooth side surface swells greatly to the outside, the assembling property when the friction plate is spline-fitted to the multi-plate clutch carrier thereafter is deteriorated.

  The main object of the present invention is to provide a hub member capable of improving assemblability when assembling a friction plate.

  The hub member manufacturing method and hub member of the present invention employ the following means in order to achieve the above-mentioned main object.

The manufacturing method of the hub member of the present invention includes:
A manufacturing method of a hub member that constitutes a friction engagement element together with a plurality of friction plates that are spline-fitted to the outer periphery,
(A) forming a material having a cylindrical part having a plurality of spline teeth formed on the outer periphery;
(B) At one end side in the axial direction of the cylindrical portion of the material, cut from the outer peripheral side of the cylindrical portion toward the inner peripheral side so that the larger diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth. Process,
(C) at the one end of the cylindrical portion after the cutting process, a step of projecting a large diameter portion of the spline teeth radially inward to form an inner protruding portion;
It is characterized by including.

  In the hub member manufacturing method of the present invention, first, a material (semi-finished product) having a cylindrical portion having a plurality of spline teeth formed on the outer periphery is formed. Subsequently, at the one end side in the axial direction of the cylindrical portion of the material, cutting is performed from the outer peripheral side of the cylindrical portion toward the inner peripheral side so that the larger diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth. In this way, by cutting from the outer peripheral side to the inner peripheral side of the cylindrical part at one end side in the axial direction of the cylindrical part, from the outer peripheral side (outer side) to the inner peripheral side (inner side) of the spline teeth. Sag. Then, at one end in the axial direction of the cylindrical portion after the cutting process, the large-diameter portion of the spline teeth is protruded radially inward to form an inner protruding portion. In the hub member manufacturing method of the present invention, when the inner protrusion is formed, the large diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth, and therefore the large diameter portion does not protrude from the small diameter portion of the spline teeth. Compared to the case where the small diameter portion, the large diameter portion and the tooth surface portion are flush with each other, there is less material around the portion where the inner protruding portion shape portion is to be formed in the tooth surface portion. Therefore, when forming an inner side protrusion part, the extent to which a tooth surface part swells outside can be suppressed. As a result, it is possible to improve the assembling performance when a plurality of friction plates are subsequently fitted to the hub member by spline fitting.

  In the hub member manufacturing method of the present invention, in the step (b), the spline includes a die disposed on the inner peripheral side of the cylindrical portion and a punch disposed on the outer peripheral side of the cylindrical portion. Using a processing device configured such that the clearance between the die and the punch at the tooth surface portion of the spline teeth is larger than the clearance between the die and the punch at the small diameter portion and the large diameter portion of the tooth In addition, it may be a step of cutting from the outer peripheral side of the cylindrical part toward the inner peripheral side at the one end side of the cylindrical part. By doing so, the sagging from the outside to the inside at the tip of the tooth surface portion of the spline teeth becomes larger. Thereby, when forming an inner side protrusion part, the extent which a tooth surface part swells outside can be suppressed more.

The hub member of the present invention is
A hub member that constitutes a friction engagement element together with a plurality of friction plates that are spline-fitted to the outer periphery,
It has a cylindrical part with a plurality of spline teeth formed on the outer periphery,
At one end in the axial direction of the cylindrical portion, a larger diameter portion protrudes in the axial direction than a small diameter portion of the spline teeth, and an inner protruding portion that protrudes radially inward is formed on the large diameter portion. ,
This is the gist.

  In the hub member of the present invention, at the one end in the axial direction of the cylindrical portion having a plurality of spline teeth formed on the outer periphery, the large diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth, and the large diameter portion An inner projecting portion that projects inward in the radial direction is formed. The large diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth, so that when the inner protrusion portion is formed, the large diameter portion does not protrude from the small diameter portion (the small diameter portion, the large diameter portion and the tooth of the spline teeth). Since the material around the portion where the inner projecting portion is to be formed in the tooth surface portion is less than that in which the surface portion is flush with the surface portion, the extent to which the tooth surface portion swells outward at that time is suppressed. As a result, it is possible to improve the assembling performance when a plurality of friction plates are subsequently fitted to the hub member by spline fitting.

It is a block diagram which shows the outline of a structure of the transmission 10 provided with the multi-plate clutch 1 which has the clutch hub 3 as a hub member which is one Example of this invention. 3 is an enlarged view of a part of one end of the clutch hub 3 in the axial direction. FIG. 5 is a manufacturing process diagram illustrating an example of a method for manufacturing the clutch hub 3. FIG. 2 is a configuration diagram showing an outline of a configuration of a material (semi-finished product) 300 of the clutch hub 3. FIG. It is explanatory drawing which shows the mode of a cutting process. 2 is a configuration diagram showing an outline of the configuration of a die 101. FIG. 2 is a configuration diagram showing an outline of the configuration of a punch 111. FIG. It is the enlarged view to which the periphery of the incision part 102,112 of the die | dye 101 and the punch 111 was expanded. It is a block diagram which shows the outline of a structure of the member 301 after a cutting | disconnection after a cutting process. It is explanatory drawing which shows a mode that the spline tooth | gear 331 of the member 301 after a cutting | disconnection was seen from the front end side (lower side of FIG. 9). It is explanatory drawing which shows the mode of a deformation process. It is a block diagram which shows the outline of a structure of the punch 131 of the deformation | transformation processing apparatus 120. FIG. FIG. 3 is a configuration diagram showing an outline of the configuration of the clutch hub 3 after formation of the weir portion 38 (when the manufacture of the clutch hub 3 is completed). It is explanatory drawing which shows a mode that the spline tooth | gear 33 of the clutch hub 3 after formation of the dam part 38 was seen from the front end side (lower side of FIG. 13). It is explanatory drawing used for demonstrating the manufacturing process of the clutch hub 3 of an Example, and the manufacturing method of the clutch hub 3a of a comparative example. It is the enlarged view to which the periphery of the cutting-tooth part 102a, 112a of the dice | dies 101a and the punch 111a of the cutting processing apparatus 100a of a comparative example was expanded. It is explanatory drawing which shows the mode of the front-end | tip of the spline teeth 331 and 331a of the Example after a cutting process, and a comparative example. It is explanatory drawing which shows the mode of the front-end | tip of the spline teeth 33 and 33a of the Example after a deformation process (at the time of completion of manufacture of the clutch hubs 3 and 3a) and a comparative example.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of a transmission 10 including a multi-plate clutch 1 having a clutch hub 3 as a hub member according to an embodiment of the present invention. FIG. It is the enlarged view to which a part of one end of the direction was expanded.

  As shown in the figure, a transmission 10 according to an embodiment is a stepped automatic transmission mounted on a vehicle, and includes an input shaft 11, a plurality of planetary gears, and a plurality of planetary gears connected to a crankshaft of an engine via a torque converter. A transmission mechanism having a clutch and a brake, an output shaft (not shown) connected to a driving wheel of the vehicle via a differential gear, and the like are provided. The multi-plate clutch 1 is configured as a hydraulic clutch of the transmission mechanism, and connects the input shaft 11 and the planetary carrier 13 of the planetary gear 12 of the transmission mechanism and releases the connection therebetween.

  The multi-plate clutch 1 is spline-fitted to the clutch drum 2 fixed to the input shaft 11, the clutch hub 3 fixed to the planetary carrier 13 of the planetary gear 12, and the inner periphery of the clutch drum 2 slidably. A plurality of annular clutch plates (driven plates) 4, a plurality of annular clutch plates (drive plates) 5 that are slidably fitted on the outer periphery of the clutch hub 3, and an axial slide in the clutch drum 2. A clutch piston 6 that is movably disposed and movable toward the clutch plates 4, 5, and a cancel that is disposed closer to the output shaft than the clutch piston 6 and that cancels the centrifugal hydraulic pressure generated in the clutch drum 2 Cancel plate 7 that defines oil chamber together with clutch piston 6, clutch piston 6 and cancel With a return spring 8 which is disposed between the plate 7, the. The multi-plate clutch 1 moves the clutch piston 6 toward the plurality of clutch plates 4 and 5 using hydraulic pressure of hydraulic oil supplied from a hydraulic control unit (none of which is shown) connected to an oil pump. The clutch drum 2 and the clutch hub 3 are connected by sandwiching a plurality of clutch plates 4 and 5 between the clutch piston 6 and the retaining plate 22 fixed to the clutch drum 2 via the snap ring 21. As a result, the clutch drum 2 and the clutch hub 3 rotate together, and the power from the engine can be transmitted from the input shaft 11 to the planetary carrier 13 of the planetary gear 12 via the clutch drum 2 and the clutch hub 3.

  As can be seen from FIG. 1, the clutch hub 3 constituting the multi-plate clutch 1 is configured as a bottomed cylindrical body, has a base 31 having an opening at the center and being fixed to the planetary carrier 13 of the planetary gear 12, And a cylindrical portion 32 extending in the axial direction (left side in the drawing) from the outer periphery of the base portion 31. As shown in FIGS. 1 and 2, a plurality of spline teeth 33 for slidably supporting the clutch plate 5 are formed on the outer periphery of the cylindrical portion 32 so as to extend in the axial direction of the clutch hub 3. On the inner side (back side) of each spline tooth 33, a recess 37 having a bottom surface on the inner side of the large diameter portion 34 of the spline tooth 33 is formed so as to extend in the axial direction of the clutch hub 3. Further, on the open end side (the left side in FIGS. 1 and 2) of the cylindrical portion 32, the large diameter portion 34 of the spline teeth 33 protrudes in the axial direction of the clutch hub 3 from the small diameter portion 35 (the tooth surface portion from the small diameter portion 35. 36 and protrudes in the axial direction toward the large diameter portion 34). Further, at the tip of each recess 37 (the left end in FIG. 1), a weir 38 as an inner protrusion that protrudes radially inward from the inside of the large diameter portion 34 of the spline teeth 33 so as to block the tip of the recess 37 to some extent. Is formed. In addition, a communication hole 39 that connects the inside and the outside of the large diameter portion 34 is formed in the vicinity of the dam portion 38 in the large diameter portion 34 of the cylindrical portion 32.

  In the multi-plate clutch 1 of the embodiment configured as described above, when the oil pump is operated as the vehicle travels (engine operation), the hydraulic oil is passed through the oil passage formed in the input shaft 11 in the clutch hub 3. Etc. The hydraulic oil supplied into the clutch hub 3 accumulates in a plurality of recesses 37 formed on the inner periphery of the clutch hub 3 and then flows around the clutch plates 4 and 5 through the communication holes 39. At this time, since the above-mentioned weir portion 38 is formed at the tip of each recess 37 of the clutch hub 3, the hydraulic oil flows out from the open end side of the clutch hub 3, that is, from the tip side of each recess 37. Can be suppressed. Therefore, in the multi-plate clutch 1 of the embodiment, a sufficient amount of hydraulic oil can be supplied from the communication holes 39 to the clutch plates 4 and 5 to lubricate and cool the plurality of clutch plates 4 and 5 well. It becomes. The hydraulic oil that has lubricated and cooled the clutch plates 4 and 5 flows into an oil pan (not shown) through an oil hole 23 formed on the outer periphery of the clutch drum 2.

  Next, how the clutch hub 3 of the multi-plate clutch 1 is manufactured will be described. FIG. 3 is a manufacturing process diagram showing an example of a manufacturing method of the clutch hub 3.

  When manufacturing the clutch hub 3, first, as shown in FIG. 4, a base 310 and a plurality of spline teeth 330 (a large diameter portion 340, a small diameter portion 350, a tooth extending from the outer periphery of the base portion 310 in the axial direction to the outer periphery. A material (semi-finished product) 300 of the clutch hub 3 is formed having a surface portion 360) and a cylindrical portion 320 having a recess 370 formed inside each spline tooth 330 (step S100). In addition, the cylindrical part 320 of this raw material 300 is formed so that the axial direction length may become longer than the axial direction length of the cylindrical part 32 of the clutch hub 3 finally obtained. This step is performed, for example, according to the following procedure. First, a metal plate having a base portion having an opening at the center and a cylindrical portion extending in the axial direction from the outer periphery of the base portion by punching and drawing the metal plate using a press molding device (not shown). A bottomed cylinder is obtained. Subsequently, the bottomed cylindrical body is pressed using a press molding device for spline molding (not shown), thereby forming a plurality of spline teeth 330 on the outer periphery of the cylindrical portion of the bottomed cylindrical body and the spline. A recess 370 is formed inside the tooth 330. Furthermore, the communication hole 39 (refer FIG. 1) is formed in the cylindrical part 320. FIG. Thereby, the material 300 is obtained. In this step, a plurality of spline teeth 330 and recesses 370 can be easily formed on the outer periphery of a bottomed cylindrical body having a cylinder by performing press working using a press molding apparatus.

  Subsequently, the material 300 is cut (trimmed) at the open end side of the tubular portion 320 to cut the axial length of the tubular portion 320 of the material 300 to the tube of the clutch hub 3. The length of the shape portion 32 is set (step S110). FIG. 5 is an explanatory diagram showing a state of cutting processing, FIG. 6 is a configuration diagram showing an outline of the configuration of the die 101 of the cutting device 100 used for cutting processing, and FIG. FIG. 8 is a configuration diagram showing an outline of the configuration of the punch 111. FIG. 8 is an enlarged view of the periphery of the die 101 and the cutting teeth 102 and 112 of the punch 111 at the time of cutting, and FIG. FIG. 10 is a configuration diagram illustrating an outline of the configuration of the post-cutting member 301, and FIG. 10 is an explanatory diagram illustrating a state where the spline teeth 331 of the post-cutting member 301 are viewed from the distal end side (the lower side in FIG. 9).

  As shown in FIG. 5, the cutting apparatus 100 includes a die 101 disposed on the inner peripheral side of the cylindrical portion 320 of the material 300 and a punch 111 disposed on the outer peripheral side of the cylindrical portion 320. As shown in FIGS. 5 to 7, the die 101 and the punch 111 have incisor portions 102 and 112, respectively. As shown in FIG. 6, the incision portion 102 of the die 101 is formed on a large diameter corresponding portion 103 corresponding to the large diameter portion 340 of the spline teeth 330 of the cylindrical portion 320 of the material 300 and a small diameter portion 350 of the spline teeth 330. A corresponding small diameter corresponding portion 104 and a tooth surface corresponding portion 105 corresponding to the tooth surface portion 36 are provided. And the large diameter corresponding | compatible part 103 is formed so that the small diameter corresponding | compatible part 103 may protrude below in FIG. 6 (open end side of the cylindrical part 320) from the small diameter corresponding | compatible part 104, and the tooth surface corresponding | compatible part 105 is the large diameter corresponding | compatible part 103 and The small diameter corresponding part 104 is formed so as to be continuous with a straight line. Further, like the die 101, the incisor portion 112 of the punch 111 has a large diameter corresponding portion 113, a small diameter corresponding portion 114, and a tooth surface corresponding portion 115. And the small diameter corresponding | compatible part 114 is formed so that it may protrude in the upper side in FIG. 7 from the large diameter corresponding | compatible part 113, and the tooth surface corresponding | compatible part 115 makes the large diameter corresponding | compatible part 113 and the small diameter corresponding | compatible part 114 continue in a straight line. Is formed. Further, as shown in FIG. 8, the die 101 and the punch 111 are, at the time of cutting, a clearance C 1 between the large diameter corresponding portion 103 and the large diameter corresponding portion 113 and a clearance C 2 between the small diameter corresponding portion 104 and the small diameter corresponding portion 114. Further, the clearance C3 between the tooth surface corresponding portion 105 and the tooth surface corresponding portion 115 is configured to be larger.

  In the cutting process, first, as shown in FIG. 5A, the die 101 is pressed against the inside of a plurality (three in FIG. 6) of spline teeth 330 from the inner peripheral side of the cylindrical portion 320 of the material 300 and punched. 111 is pressed against the outside of the spline teeth 330 from a position corresponding to the die 101 on the outer peripheral side of the cylindrical portion 320. Then, as shown in FIG. 5B, the punch 111 is moved radially inward to cut the open end side of the cylindrical portion 320 corresponding to the plurality of spline teeth 330. By repeatedly performing the same processing while rotating the material 300 in the circumferential direction of the cylindrical portion 320, one end side is cut over the entire circumference of the cylindrical portion 320. Through such a process, at the open end of the tubular portion 321 of the post-cutting member 301 (the tip of the spline teeth 331), as shown in FIG. 9, the large diameter portion 341 protrudes in the axial direction from the small diameter portion 351 of the spline teeth 331. (It protrudes in the axial direction from the small diameter portion 351 to the large diameter portion 34 through the tooth surface portion 361), and as shown in FIG. 10, sagging occurs inside the tip of each spline tooth 331. (See straight arrow). Moreover, in the cutting apparatus 100, the clearance C3 is made larger than the clearances C1 and C2, so that the sagging of the tip end of each spline tooth 331 is larger at the tooth surface portion 361 than at the large diameter portion 341 and the small diameter portion 351. That is, the sagging inward at the tip of the tooth surface portion 361 becomes larger.

  When the cutting process is performed in this way, the weir part 38 is formed by performing a deformation process for projecting the tip of the large diameter part 341 of the spline teeth 331 inward to the cylindrical part 321 of the member 301 after cutting (step S120). The manufacture of the clutch hub 3 is completed. FIG. 11 is an explanatory diagram showing the state of deformation processing, FIG. 12 is a configuration diagram showing an outline of the configuration of the punch 131 of the deformation processing apparatus 120 used for deformation processing, and FIG. FIG. 14 is a configuration diagram schematically showing the configuration of the clutch hub 3 after (when the manufacture of the clutch hub 3 is completed), and FIG. 14 shows the spline teeth 33 of the clutch hub 3 after the formation of the weir portion 38 on the tip side (in FIG. 13). It is explanatory drawing which shows a mode seen from the lower side. In FIG. 12, the spline teeth 331 of the post-cutting member 301 are also shown for easy understanding.

  As shown in FIG. 11, the deformation processing device 120 includes a die 121 disposed on the inner peripheral side of the cylindrical portion 321 of the post-cutting member 301 and a punch 131 disposed on the outer peripheral side of the cylindrical portion 321. Prepare. As shown in FIG. 12, the punch 131 has a projecting portion 132 narrower than the width (length in the circumferential direction) of the large-diameter portion 341 of the spline teeth 331 and a large-diameter portion when the weir portion 38 is formed by the projecting portion 132. And a pressing portion 133 formed so as to be aligned with the outer side of the circumferential edge portion 341e and the tooth surface portion 361.

  In the deformation process, first, as shown in FIG. 11A, the die 121 is cut from the inner peripheral side of the cylindrical portion 321 of the member 301 to the inside of the vicinity of the tips of a plurality of (for example, three) spline teeth 331. The punch 131 is pressed against the outside of the spline teeth 331 from a position corresponding to the die 121 on the outer peripheral side of the cylindrical portion 321 (specifically, the protruding portion 132 is pressed against the tip of the large diameter portion 341). Then, as shown in FIG. 11B, the punch 131 is moved radially inward, and the tip of the large diameter part 341 of the spline teeth 331 is protruded radially inward by the protrusion 132. As a result, as shown in FIGS. 13 and 14, a dam portion 38 is formed at the tip of the large diameter portion 34 of the spline teeth 33 of the clutch hub 3. By repeatedly performing the same processing while rotating the tubular portion 321 of the member 301 after cutting in the circumferential direction, the weir portion 38 is formed at the tip of the large diameter portion 34 of each spline tooth 33 of the tubular portion 32. In this step, as shown by the straight arrows in FIG. 14, the inner sag of the spline teeth 33 increases, and the outer bulge increases at the outer periphery. In the embodiment, since the large diameter portion 341 protrudes in the axial direction from the tooth surface portion 361 and the small diameter portion 341 at the tip of the spline teeth 331 of the cylindrical portion 321 (the lower end in FIG. 11), the large diameter portion, the tooth surface portion, Compared to the case where the small diameter portion is flush with the tip of the spline teeth, there is less material around the portion where the weir portion 38 is to be formed in the tooth surface portion 361 (around the tip of the large diameter portion 341 in the axial direction). For this reason, when the weir part 38 is formed, the material around the part of the tooth surface part 361 where the weir part 38 is to be formed easily moves inward in the radial direction, so that the extent of the tooth surface part 361 bulging outward can be suppressed. In addition, in the embodiment, in the cutting process, the clearance C3 between the tooth surface corresponding portion 105 of the die 101 and the tooth surface corresponding portion 115 of the punch 111 is increased to cause the cylindrical portion 321 to sag inside the tooth surface portion 362. Since it became larger, when forming the dam part 38, the extent which the tooth surface part 361 swells outside can be suppressed more. As a result, it is possible to further improve the assembling property when the plurality of clutch plates 5 are spline-fitted (assembled) to the clutch hub 3 after the manufacture of the clutch hub 3 is completed. In this embodiment, since the punch 131 having the protruding portion 132 narrower than the width (circumferential length) of the large-diameter portion 341 of the spline teeth 331 is used, in this deformation process, the width direction (circumferential) of the large-diameter portion 341 is used. In other words, a part near the center in the width direction is projected inward in the radial direction instead of the entire (direction). The part near the center in the width direction of the large diameter part 341 protrudes inward in the radial direction because if the entire width direction of the large diameter part 341 protrudes inward in the radial direction, teeth near the tip of the large diameter part 341 are projected. This is because the surface portion 361 is greatly deformed and the assembling property is deteriorated.

  FIG. 15A and FIG. 15B are explanatory views used to explain the manufacturing process of the clutch hub 3 of the embodiment and the manufacturing method of the clutch hub 3a of the comparative example, respectively. 15 (a) and 15 (b) both show a state in which the periphery of the open end (tip of the spline teeth 330) of the cylindrical portion 320 of the material 300 is viewed from the outer peripheral side, and the middle stage shows a post-cut member. The state where the periphery of the open ends of the cylindrical portions 321 and 321a of 301 and 301a is viewed from the outer peripheral side is shown, and the lower stage is the opening of the cylindrical portions 32 and 32a after deformation processing (when the manufacture of the clutch hubs 3 and 3a is completed). The appearance of the periphery of the edge viewed from the outer periphery side is shown.

  Here, as a comparative example, the open end side of the cylindrical portion 320a is set so that the tips of the large diameter portion 340a, the small diameter portion 350a, and the tooth surface portion 360a of the spline teeth 330a are flush with the material (semi-finished product) 300. A case where the clutch hub 3a is manufactured by performing a cutting process for cutting and performing a deformation process for projecting the tip of the large diameter part 341a of the cylindrical part 321a of the member 301a after the cutting to the inside in the radial direction to form the weir part 38a. To think about. In the case of the comparative example, in the cutting process, the cutting apparatus 100a is used instead of the cutting apparatus 100 of the embodiment, and in the deformation process, the deformation processing apparatus 120 is used as in the embodiment. FIG. 16 is an enlarged view enlarging the periphery of the die 101a and the cutting teeth 102a and 112a of the punch 111a during the cutting process of the cutting apparatus 100a of the comparative example. The incision portion 102a of the die 101a of the cutting apparatus 100a of the comparative example has a large diameter corresponding portion 103a, a small diameter corresponding portion 104a, and a tooth surface corresponding portion 105a, which are formed so as to be flush with each other. Further, the incision portion 112a of the punch 111a of the cutting apparatus 100a has a large diameter corresponding portion 113a, a small diameter corresponding portion 114a, and a tooth surface corresponding portion 115a, which are formed so as to be flush with each other. Therefore, the die 101a and the punch 111a are cut between the large diameter corresponding portion 103a and the large diameter corresponding portion 113a, between the small diameter corresponding portion 104 and the small diameter corresponding portion 114, and the tooth surface corresponding portion 105 and the tooth surface. The clearance C4 between the corresponding portions 115 is constant (for example, constant at the same level as the clearances C1 and C2).

  FIG. 17A and FIG. 17B are explanatory views showing the states of the tips of the spline teeth 331 and 331a of the example and the comparative example after cutting, respectively. The straight arrows in FIGS. 17A and 17B indicate the extent to which sagging occurs inside the tooth surface portions 361 and 361a of the spline teeth 331 and 331a. In the comparative example, as shown in FIG. 16, since the clearance C4 between the die 101a and the punch 111a is relatively small (for example, the same as the clearances C1 and C2), the spline teeth 331a after cutting are processed. The sagging inside the front end of the surface portion 361a is relatively small. On the other hand, in the embodiment, as shown in FIG. 8, the clearance C3 between the tooth surface corresponding portion 105 of the die 101 and the tooth surface corresponding portion 115 of the punch 111 is made relatively large (larger than the clearances C1 and C2). The sagging inside the tip of the tooth surface portion 361 of the spline tooth 331 after the cutting process is increased.

  18 (a) and 18 (b) are explanatory views showing the states of the tips of the spline teeth 33 and 33a of the example and the comparative example after deformation (when the manufacture of the clutch hubs 3 and 3a is completed), respectively. is there. 18 (a) and 18 (b), the inward-facing linear arrows (inner peripheral linear arrows) indicate the extent to which the sagging increases inward, and the outward linear arrows (outer peripheral side). The straight arrow) indicates the degree of swelling outward. In the comparative example, as can be seen from the middle and lower stages of FIG. 15B, when the weir part 38a is formed on the inner side (back side of the paper surface) of the large diameter part 341a, the weir part 38a is scheduled to be formed in the tooth surface part 361a. As shown in FIG. 18 (b), the portion on the outer peripheral side of the tooth surface portion 36a of the spline teeth 33a is sufficiently large because the material around the portion (the portions on the left and right sides of the weir portion 38a in FIG. 15 (b)) is sufficiently large. May swell relatively outward. Note that, as shown in FIG. 12, this swelling may not be sufficiently suppressed even if the tooth surface portion 361 a of the spline tooth 331 a is pressed from the outside by the pressing portion 133 of the punch 131. On the other hand, in the embodiment, as can be seen from the middle stage and the lower stage of FIG. 15A, when the weir part 38 is formed on the inner side (back side of the paper surface) of the large diameter part 341, the tooth surface part 361 Since there is little material around the portion where the weir portion 38 is to be formed (the portions on the left and right sides of the weir portion 38 in FIG. 15A), the outer peripheral side of the tooth surface portion 36 of the spline teeth 33 as shown in FIG. It is possible to suppress the extent that the portion of the swells outward. In addition, in the embodiment, the clearance C3 between the tooth surface corresponding portion 105 of the die 101 and the tooth surface corresponding portion 115 of the punch 111 is increased so that the spline teeth 331 after the cutting work are sag inside the tip of the tooth surface portion 361. Therefore, when the weir portion 38 is formed, it is possible to further suppress the extent that the outer peripheral portion of the tooth surface portion 36 of the spline teeth 33 bulges outward. As a result, in the embodiment, as compared with the comparative example, after the manufacture of the clutch hub 3 is completed, the assemblability when the clutch hub 3 is spline-fitted (assembled) to the clutch hub 3 is further improved. Can do.

  In the manufacturing method of the clutch hub 3 of the multi-plate clutch 1 of the above-described embodiment, first, one end side of the cylindrical portion 320 (with respect to the material 300 having the cylindrical portion 320 having the spline teeth 330 formed on the outer periphery ( The post-cut member 301 is cut from the outer peripheral side to the inner peripheral side of the cylindrical portion 320 so that the large diameter portion 340 protrudes in the axial direction from the small diameter portion 350 of the spline teeth 330 at the tip end side of the spline teeth 330. Get. Then, the weir portion 38 is formed by projecting the large diameter portion of the spline teeth 331 radially inward at one end of the cylindrical portion 321 of the post-cutting member 301. When the weir part 38 is formed, the large diameter part 341 protrudes in the axial direction from the small diameter part 351 of the spline teeth 331 so that the small diameter part, the tooth surface part, and the large diameter part are flush with each other. In comparison, the extent to which the tooth surface portion 361 (36) of the spline teeth 331 (33) bulges outward can be suppressed. As a result, it is possible to improve the assembling property when the plurality of clutch plates 5 are spline-fitted (assembled) to the clutch hub 3 after the manufacture of the clutch hub 3 is completed.

  Moreover, in the method of manufacturing the clutch hub 3 of the embodiment, the clearance C1 between the large diameter corresponding portion 103 of the die 101 and the large diameter corresponding portion 113 of the punch 111 and the small diameter corresponding portion 104 of the die 101 and the small diameter corresponding portion 114 of the punch 111 are used. The material 300 is cut using the cutting device 100 configured such that the clearance C3 between the tooth surface corresponding portion 105 of the die 101 and the tooth surface corresponding portion 115 of the punch 111 is larger than the clearance C2 between the die 101 and the punch. Thereby, since the sagging to the inner side of the tip of the tooth surface portion 361 of the spline teeth 331 of the cylindrical portion 321 of the post-cutting member 301 becomes larger, the tooth surface portion 36 of the spline teeth 33 is outside when the weir portion 38 is formed. The degree of swelling can be further suppressed.

  In the manufacturing method of the clutch hub 3 of the embodiment, the clearance C1 between the large diameter corresponding portion 103 of the die 101 and the large diameter corresponding portion 113 of the punch 111 and the small diameter corresponding portion 104 of the die 101 and the small diameter corresponding portion 114 of the punch 111 are determined. The material 300 is cut using the cutting device 100 configured such that the clearance C3 between the tooth surface corresponding portion 105 of the die 101 and the tooth surface corresponding portion 115 of the punch 111 is larger than the clearance C2. However, from the outer peripheral side of the cylindrical part 320 toward the inner peripheral side so that the large diameter part 340 protrudes in the axial direction from the small diameter part 350 of the spline tooth 330 on one end side (the tip side of the spline teeth 330) of the cylindrical part 320. Can be used as long as the clearances C1, C2, and C3 are substantially the same. It may performs cutting against 300. Even in this case, when forming the weir portion 38 by projecting the tip of the large diameter portion 341 radially inward, the large diameter portion 341 protrudes in the axial direction from the small diameter portion 351 of the spline teeth 331, thereby reducing the small diameter. As compared with the case where the portion, the tooth surface portion, and the large diameter portion are flush with each other, the extent to which the tooth surface portion 361 (36) of the spline teeth 331 (33) bulges outward can be suppressed.

  In the embodiment, the punch 131 of the deformation processing apparatus 120 includes the protruding portion 132 and the pressing portion 133, but may not include the pressing portion 133.

  In the embodiment, the clutch hub 3 constituting the multi-plate clutch 1 and the manufacturing method thereof have been described, but the present invention may be applied to the brake hub constituting the multi-plate brake and the manufacturing method thereof.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the clutch plate 5 corresponds to a “friction plate”, the multi-plate clutch 1 corresponds to a “clutch”, and the clutch hub 3 corresponds to a “hub member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the hub member manufacturing industry and the like.

  1 multi-plate clutch, 2 clutch drum, 3, 3a clutch hub, 4, 5 clutch plate, 6 clutch piston, 7 cancel plate, 8 return spring, 10 transmission, 11 input shaft, 12 planetary gear, 13 planetary carrier, 21 Snap ring, 22 retaining plate, 23 oil hole, 31, 310, 311 base, 32, 320, 320a, 321, 321a cylindrical part, 33, 33a, 330, 330a, 331, 331a spline teeth, 34, 34a, 340, 340a, 341, 341a Large diameter part, 35, 35a, 350, 350a, 351, 351a Small diameter part, 36, 36a, 360, 360a, 361, 361a Tooth surface part, 37, 370 Recessed part, 38, 38a Weir part, 39 communication holes, 100, 100 a cutting machine, 101, 101a, 121 dies, 102, 102a, 112, 112a incisors, 103, 103a, 113, 113a large diameter corresponding parts, 104, 104a small diameter corresponding parts, 105, 105a, 115, 115a teeth Surface corresponding portion, 111, 111a, 131 punch, 120 deformation processing device, 132 projecting portion, 133 pressing portion, 300 material, 301 post-cutting member, 341e edge, C1, C2, C3, C4 clearance.

Claims (3)

A manufacturing method of a hub member that constitutes a friction engagement element together with a plurality of friction plates that are spline-fitted to the outer periphery,
(A) forming a material having a cylindrical part having a plurality of spline teeth formed on the outer periphery;
(B) At one end side in the axial direction of the cylindrical portion of the material, cut from the outer peripheral side of the cylindrical portion toward the inner peripheral side so that the larger diameter portion protrudes in the axial direction from the small diameter portion of the spline teeth. Process,
(C) at the one end of the cylindrical portion after the cutting process, a step of projecting a large diameter portion of the spline teeth radially inward to form an inner protruding portion;
The manufacturing method of the hub member containing this. A method of manufacturing a hub member according to claim 1,
In the step (b), a die disposed on the inner peripheral side of the cylindrical portion and a punch disposed on the outer peripheral side of the cylindrical portion are the small diameter portion and the large diameter portion of the spline teeth. On the one end side of the cylindrical portion, using a processing device configured such that the clearance between the die and the punch at the tooth surface portion of the spline teeth is larger than the clearance between the die and the punch. It is a step of cutting from the outer peripheral side of the cylindrical part toward the inner peripheral side,
Manufacturing method of hub member. A hub member that constitutes a friction engagement element together with a plurality of friction plates that are spline-fitted to the outer periphery,
It has a cylindrical part with a plurality of spline teeth formed on the outer periphery,
At one end in the axial direction of the cylindrical portion, a larger diameter portion protrudes in the axial direction than a small diameter portion of the spline teeth, and an inner protruding portion that protrudes radially inward is formed on the large diameter portion. ,
Hub member.

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