JPH1147867A - Tapered spline tooth forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device capable of forming a tapered spline tooth without causing the large-sizing of device and the remarkable increase of manufacturing costs. SOLUTION: The tapered spline tooth forming parts 43 mutually expanding in a normal condition are provided in the inner peripheral surface of respective tip end parts of plural cylindrical parts 45 extending along the axial center so as to encircle the axial center of the rough shape material Ws of a second gear positioned and held in the working position, and moreover these tapered spline tooth forming parts 43 are held in the state mutually approached with the chuck pusher 16 transferring along the above axial center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming tapered spline teeth used in a transmission gear or the like, and more particularly, to a plurality of straight splines parallel to each other on an outer peripheral surface in advance. The holding member is brought into contact with both ends of the rough material having teeth formed along the axial direction to position and hold the rough material at a predetermined processing position. The present invention relates to an improvement in a tapered spline tooth forming device in which a tapered spline tooth forming section is pressed against a straight spline tooth of a material to form the straight spline teeth into tapered spline teeth.

[0002]

2. Description of the Related Art For example, there is a clutch gear applied to a transmission of a four-wheeled vehicle in which tapered spline teeth are applied as a meshing mechanism with a sleeve in order to prevent inadvertent gear disengagement.

The tapered spline teeth are formed in a tapered shape so that the tooth thickness gradually increases toward the tip end. Due to factors such as
The force in the pull-out direction is not generated on the spline teeth of the sleeve.

As described above, since the thickness of this type of tapered spline tooth varies along the axial direction, a conventional apparatus for forming a straight spline tooth is used. It is difficult to mold.

For this reason, conventionally, a molding apparatus as shown in FIG. 10 has been provided.

The molding apparatus includes an upper mold 1 and a lower mold 2 which can be opened and closed with each other, and a work base 3 arranged with the axis of the lower mold 2 along a vertical direction, and a work base 3 with each other along a horizontal direction. A plurality of dies 4 are provided radially, and each of the dies 4 moves forward and backward in the longitudinal direction in such a manner that each die approaches and separates from the axis of the work base 3.

In the above-mentioned molding apparatus, first, the rough material Ws is arranged at the tip of the work base 3, and from this state, the upper mold 1 is moved.
Is moved downward, thereby positioning and holding the coarse material Ws between the upper mold 1 and the lower mold 2. At this time, a plurality of straight spline teeth Ss parallel to each other are formed in advance on the outer peripheral surface of the coarse material Ws along the axial direction by applying a molding apparatus which has been used conventionally.

From the above-mentioned state, the plurality of dies 4 are moved in the directions approaching the axis of the work base 3, and the tapered spline tooth forming portions 4 formed at the tips of the dies 4 are formed.
When a is pressed against the straight spline teeth Ss of the coarse material Ws, the straight spline teeth Ss are each formed into a tapered spline tooth.

According to such a forming apparatus, since only forging is performed, the manufacturing process of the clutch gear can be simplified, and the metal flow is not cut by the gear portion of the clutch gear and the tapered spline teeth. A high-strength clutch gear can be formed.

[0010]

By the way, in the molding apparatus described above, a large number of independent dies 4 are arranged radially, and these dies 4 are moved in the horizontal direction along their respective longitudinal directions. For this reason, a large die space is required in the outer peripheral area of the coarse material Ws, which leads to an increase in the size of the apparatus.

Further, in order to accurately press the individual dies 4 arranged radially against the straight spline teeth Ss, the dies 4
And its sliding parts require high processing accuracy,
This is a factor that significantly increases the manufacturing cost of the device.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an apparatus capable of forming tapered spline teeth without increasing the size of the apparatus and significantly increasing the manufacturing cost.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a holding member is applied to each end face of a rough member having a plurality of straight spline teeth parallel to each other formed on an outer peripheral surface thereof in advance along an axial direction. The rough shaped material is positioned and held at a predetermined processing position by being in contact with the raw material, and from this state, a tapered spline tooth forming portion is pressed against a straight spline tooth of the rough shaped material, whereby the straight spline tooth is formed. In a tapered spline tooth forming device that is each formed into a tapered spline tooth, each extends along the axis in a mode surrounding the axis of the coarse material positioned and held at the processing position, And each of the tapered spline tooth forming portions is provided on the inner surface of each of the distal end portions, and each of the tapered spline tooth forming portions expands to each other in a normal state. When the front ends of the coarse material are positioned close to the straight spline teeth of the rough material positioned and held at the machining position, and the respective tips are brought close to each other against the individual elastic force, the shaft of the rough material is A plurality of elastic tongue pieces, each of which forms a substantially cylindrical centered center, and each of the tapered spline tooth forming portions is arranged at a position in contact with a straight spline tooth of the coarse material, and In the state of being separated from and contacting the outer peripheral surface of the piece, the movable member is disposed so as to be movable along the axis of the coarsely shaped material positioned and held at the processing position, and occupies the outer peripheral region of each tapered spline tooth forming portion. And a pressing member for holding the respective tips in a state of being close to each other against the elastic force of the elastic tongue.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing one embodiment. FIG. 1 conceptually shows one embodiment of a tapered spline tooth forming apparatus according to the present invention. The molding device exemplified here is a clutch gear used as a transmission gear of a motorcycle or a four-wheeled vehicle, for example, a second gear W provided on a counter shaft of a four-wheeled vehicle transmission as shown in FIG. 6D and FIG.
This is applied when a second gear semi-molded product Wh as shown in FIGS. 6 (f) to 6 (h) is formed from a second gear crude material Ws as shown in (e) by a forging press machine. is there.

Here, the second gear W of the transmission is shown in FIG.
As shown in the figure, a gear portion G having a helical tooth g for shifting formed on the outer peripheral surface, and a tapered spline tooth disposed on one side surface of the gear portion G and having a smaller diameter than the gear portion G. T
s, and a cone portion C which is disposed on one side of the spline portion S and has a tapered cone portion whose outer diameter gradually decreases as the distance from the spline portion S increases.
The gear portion G, the spline portion S, and the cone portion C are integrated with each other in a state where their axes are aligned with each other, and a counter shaft mounting hole Hc is formed at the center thereof. As shown in FIG. 6 (h), the tapered spline teeth Ts gradually increase as the tooth thickness along the axial direction moves toward the cone portion C, and further include a chamfer Ch for assisting meshing at the tip portion. Have.

On the other hand, as shown in FIG. 6 (d), the second gear coarse material Ws to be molded by the molding apparatus corresponds to the gear portion G, the spline portion S and the cone portion C of the second gear W described above. G ', S', and C 'are roughly formed, and a shaft hole Hj having a diameter smaller than the countershaft mounting hole Hc is formed at the center thereof.
A plurality of straight spline teeth Ss parallel to each other are formed along the axial direction on the outer peripheral surface of the spline portion equivalent portion S '. As shown in FIG. 6 (e), the straight spline teeth Ss have a constant tooth thickness along the axial direction, and have a chamfer Ch at the front end similar to the tapered spline teeth Ts described above. .

The second gear coarse material Ws is formed through the following procedure.

(1) SC steel (carbon steel casting), SCM
Steel (chromium molybdenum steel), SNC steel (nickel chrome steel), SNCM steel (nickel chromium molybdenum steel), SCr steel (chromium steel) and other appropriate steel materials are selected, and FIG. As shown in a), this is cut to a required length to obtain a raw material Wo.

(2) The raw material Wo is subjected to appropriate hot forging such as upsetting to form a first material W1 as shown in FIG. 6 (b).

(3) The first material W1 is further appropriately forged, and the second material W1 as shown in FIG.
Form 2

(4) Drilling is performed on the second material W2,
Applying processes such as shot blasting and cold coining,
A second gear coarse material Ws as shown in FIG. 6D is formed.

As shown in FIG. 1, an upper ram base 10 and a lower ram base which move in the vertical direction to open and close with respect to each other, as shown in FIG. 30.

The upper ram base 10 has a flat shape with a lower surface 10a extending horizontally, and an upper die mounting hole 10b formed in the center thereof has a sleeve holder 11 and a sleeve 1a.
Holding 2.

The sleeve holder 11 is provided with the upper die mounting hole 1.
0b, the outer diameter of which is substantially the same as the inner diameter of the upper die mounting hole 10b, and has a columnar shape shorter than the upper die mounting hole 10b, and has a spring receiving hole 11a at the center thereof. Is fitted and held in the upper mold mounting hole 10b in a state where the abutment is in contact with the inner bottom surface of the upper mold mounting hole 10b. Reference numeral 13 in the drawing denotes a spring seat fitted to the base end of the spring housing hole 11a.

The sleeve 12 has a base portion having a columnar shape having the same outer diameter as the sleeve holder 11 and a tip portion having a columnar shape having a diameter sufficiently larger than that of the sleeve holder 11. It has a sliding hole 12a having a diameter smaller than the inner diameter of the spring receiving hole 11a, and the upper die is mounted via the base end with its base end surface in contact with the front end surface of the sleeve holder 11. It is fitted and held in the hole 10b.

The sleeve 12 has the sliding hole 1 described above.
A guide shaft 14 is provided on 2a, and a guide ring 15 and a chuck pusher (pressing member) 16 are provided on the distal end surface thereof.

The guide shaft 14 is provided with the sliding hole 12a.
A regulating flange having an outer diameter substantially the same as the inner diameter of the sliding hole 12a and a cylindrical shape having a length substantially the same as the inner diameter of the spring accommodating hole 11a at the base end thereof; 14a, and a work pusher (holding member) 17 is held on the distal end surface thereof.
4a is arranged in the spring accommodating hole 11a of the sleeve holder 11, while the work pusher 17 is arranged on the distal end surface side of the sleeve 12. Further, in the spring accommodating hole 11a of the sleeve holder 11, between the base end surface and the spring seat 13 It is slidably fitted in the sliding hole 12a with the pressing spring 18 interposed.

The work pusher 17 has a first cylindrical portion 17a having substantially the same outer diameter as the gear portion G 'of the second gear coarsely formed material Ws, and a tip end to a tip end of the first cylindrical portion 17a. , A tapered portion 17b extending so that the outer diameter gradually decreases as it goes toward, and a portion G 'corresponding to the gear portion of the second gear coarse material Ws extending from the tip end of the tapered portion 17b. A second cylindrical portion 17c having a columnar shape with a slightly smaller outer diameter, and the other side surface of the second gear coarsely formed material Ws, that is, a spline portion S is disposed on the tip end surface of the second cylindrical portion 17c. Forming a contact fitting portion 17d for fitting the second gear coarse material Ws to the axis of the second cylindrical portion 17c by abuttingly fitting to the side surface not provided. And guide the shaft center In a state of being matched with the axis of bets 14 are in contact held in the distal end surface of the guide shaft 14 through the proximal end face of the first cylindrical portion 17a.

As is apparent from the drawing, the work pusher 17 is normally provided with the above-described pressing spring 18.
Of the first cylindrical portion 17a is kept away from the distal end surface of the sleeve 12.

The guide ring 15 is provided with the sleeve 1 described above.
2 has a guide hole 19 at the center thereof, and has a guide hole 19 at the center thereof. 1
2 is fixed to the tip surface. The guide hole 19 has a first cylindrical guide portion 19a having substantially the same inner diameter as the outer diameter of the first cylindrical portion 17a, and the same inclination angle from the tip of the first cylindrical guide portion 19a as that of the above-described tapered portion 17b. Tapered hole portion 19 extending so that the inner diameter gradually decreases with
b, extending from the tip of the tapered hole portion 19b,
The second cylindrical portion 17c having an inner diameter substantially the same as the outer diameter of the second cylindrical portion 17c.
And a cylindrical guide portion 19c. When the work pusher 17 is in the normal state, the tapered hole portion 19c is provided.
b, the inner peripheral surface thereof abuts against the tapered portion 17b, and the distal end portion of the second cylindrical portion 17c projects outside from the distal end surface of the guide ring 15 through the distal end opening of the second cylindrical guide portion 19c. I have.

The chuck pusher 16 has a cylindrical shape having the same outer diameter as the guide ring 15, and has an insertion hole 16a and an inclined cam hole 16b at the center thereof. The inclined cam hole 16 b is fixed to the distal end face of the guide ring 15 in a state where the axis of the inclined cam hole 16 b is aligned with the axis of the guide ring 15.

The insertion hole 16a is provided in the second gear coarse material Ws.
Formed with an inner diameter slightly larger than the outer diameter of the portion G 'corresponding to the gear portion.
7 accommodates a portion protruding from the distal end surface of the guide ring 15.

The inclined cam hole 16b is formed such that the inner diameter gradually increases from the distal end to the distal end of the insertion hole 16a, and forms an annular inclined cam surface 16c on the inner peripheral surface.

Reference numeral 20 in the figure denotes an upper die case having a cylindrical shape. The upper die case 20 is fitted on the outer peripheral portion of the leading end of the sleeve 12, the guide ring 15 and the chuck pusher 16, and the sleeve 12, the guide ring Fifteen
And the chuck pusher 16 are integrally connected to each other.

On the other hand, the lower ram base 30 has a flat shape in which the upper surface 30a extends horizontally, and has a lower die mounting hole 31 at the center thereof. The lower die mounting hole 31 has a case fixing portion 31 a having an inner diameter substantially the same as the outer diameter of the upper die case 20.
And a small-diameter holder fixing portion 31b formed on the inner bottom surface of the case fixing portion 31a, and the lower ram base 30 is fixed to the lower ram base 30 in such a manner that each axis is aligned with the axis of the upper die mounting hole 10b. The lower end of the lower die case 32 is fixedly held to the case fixing portion 31a.

The lower die case 32 is
0 and the case fixing portion 31 of the lower die mounting hole 31
a having a bottomed cylindrical shape having a length sufficiently larger than a, and having an insertion hole 32a having a diameter larger than that of the holder fixing portion 31b at the center of the bottom wall.
Is housed.

The die holder 33 includes a fixing columnar portion 33a having an outer diameter substantially the same as the inner diameter of the holder fixing portion 31b in the lower die mounting hole 31, and a holding columnar portion 33b having an outer diameter substantially the same as the inner diameter of the lower die case 32. And a fixing cylindrical portion 33a through an insertion hole 32a of the lower die case 32.
Is fixedly held to a holder fixing portion 31b of the lower die mounting hole 31. A work base (holding member) 3 is provided at a center portion of the upper surface of the holding columnar portion 33b via a work base holder 34.
5 is held.

The work base 35 has a mounting flange 35a on the peripheral surface of the base end and an annular receiving groove 3 on the peripheral surface of the tip end.
5b, and a portion located on the tip side with respect to the accommodation groove 35b has a columnar shape slightly larger in diameter than the spline portion equivalent portion S 'of the second gear crude material Ws. The lower die mounting hole 31 is disposed on the upper surface of the die holder 33 so as to match the axis thereof.

As is apparent from the drawing, the work base 35 has a sufficient length so that the end thereof protrudes from the upper end edge of the lower die case 32, and the end surface of the second gear coarse material Ws is formed on the end surface. It has a positioning accommodation hole 35c for defining a processing position. Positioning accommodation hole 35c
Is that when the cone portion C 'of the second gear coarse material Ws is fitted, the axis of the second gear coarse material Ws matches the axis of the work base 35 and the second gear coarse material Ws The function is to position the straight spline teeth Ss formed on Ws on the upper end surface of the work base 35.

Further, around the work base 35,
A tapered spline tooth forming die 40 and a chuck holder 36 are sequentially arranged, and a knockout spring member 37 is interposed between the work base 35 and the tapered spline tooth forming die 40.

The tapered spline tooth mold 40 is made of SU
J2 (high carbon chromium bearing steel) and other materials with high elasticity formed by applying a forming method such as electric discharge machining from a material with relatively high elasticity. It has a positioning flange 41 on the base end peripheral surface, In addition, on the outer peripheral side of the cylindrical portion (elastic tongue piece) 45, a portion extending from the positioning flange 41 to a substantially intermediate portion in the axial direction is formed to be thin, and further, the central portion has the same inner diameter as the outer diameter of the work base 35 described above. And is fixed to the upper surface of the work base holder 34 via the positioning flange 41 with its axis aligned with the axis of the work base 35. .

This tapered spline tooth mold 40 is
The distal end of the cylindrical portion 45 has a length protruding upward from the upper end surface of the work base 35 by a distance corresponding to the length of the straight spline teeth Ss formed on the second gear coarse material Ws. A plurality of tapered spline tooth forming portions 43 are provided on the inner peripheral surface of the distal end portion.

The tapered spline tooth forming section 43 is formed as shown in FIG.
As shown in FIG. 5 to FIG. 5, when the portion C 'corresponding to the cone portion of the second gear coarse material Ws is fitted into the positioning receiving hole 35c of the work base 35, the second gear coarse material Ws is formed. Projecting portions provided at respective portions of the straight spline teeth Ss facing each other,
The tapered spline teeth Ts of the second gear W between each other
In order to secure a concave portion having the same shape as the above, the width is gradually reduced toward the base end side along the axis of the tapered spline tooth forming die 40.

These tapered spline tooth forming portions 43
Is a cylindrical portion 4 located between the front end surface of the tapered spline tooth forming die 40 and immediately before the positioning flange 41.
5 is provided with a radial slit 44 along the axis of the tapered spline tooth forming die 40, so that it is equally divided with the cylindrical portion 45, so that each cylindrical portion 45, particularly a thin portion, is elastic. It is possible to move in a manner of expanding and contracting each other by deforming to each other, and in the normal state, each of them is kept slightly expanded from the base end of the thin part in the normal state due to the stress characteristics due to the slit processing described above. On the other hand, the inner diameter Ds of the imaginary circle connecting the respective inner end faces when the respective cylindrical portions 45 are brought close to each other against the elastic force of the respective cylindrical portions 45 has a portion S 'corresponding to the spline portion of the above-described second gear coarse material Ws. And the outer diameter ds connecting the grooves between the straight spline teeth Ss is the same as the outer diameter Dp of the circle connecting the respective outer peripheral surfaces is the inner diameter D of the insertion hole 16a in the chuck pusher 16 described above. It is configured to be almost the same as p.

As shown in FIG. 1, the chuck holder 36 has the same outer diameter as the holding columnar portion 33b of the die holder 33, and at the center thereof has an outer diameter Dp smaller than the outer diameter Dp of the tapered spline tooth forming die 40. Large regulation hole 3
6a, which is fixedly held on the upper surface of the work base holder 34 and the inner peripheral surface of the lower die case 32 with its axis aligned with the axis of the work base 35. I have.

As is apparent from the drawing, the chuck holder 36 projects upward beyond the upper edge of the lower die case 32 and has a tip portion corresponding to an annular accommodation groove 35b formed in the work base 35. Has a length that allows it to be arranged.

The regulating hole 36a formed in the chuck holder 36 is provided with the accommodation groove 35b of the work base 35.
The portion located on the tip end side from the portion corresponding to is slightly smaller in diameter, and by contacting the tip end outer peripheral surface of the tapered spline tooth forming die 40, the tapered spline tooth forming portions 43 When the most expanded state position is regulated, and the portion C 'corresponding to the cone portion of the second gear coarse material Ws is fitted into the positioning receiving hole 35c of the work base 35, the inside of each of the tapered spline tooth forming portions 43 is formed. The end portions serve to keep the straight spline teeth Ss formed on the second gear coarse material Ws slightly interposed between the straight spline teeth Ss.

The knockout spring member 37 is formed in a ring shape from a material having high elasticity such as rubber.
It is fitted and held in a receiving groove 35b formed in the work base 35, and in a normal state, the tapered spline tooth forming section 4
3 are mutually expanded, and the tapered spline tooth mold 40
The outer peripheral surface of each of the control holes 36a of the chuck holder 36 is
While the outer peripheral surface of the tapered spline tooth forming die 40 is pressed easily and elastically deformed, and the tapered spline tooth forming portions 43 are brought close to each other. Can be held.

Reference numeral 38 in the drawing denotes a lower die presser. The lower spline tooth forming die 40, the work base holder 34, the work base 35 and the die holder 33 are respectively connected to the lower ram base 30 via the chuck holder 36. Has the effect of retaining Also, reference numeral 21 in the figure
Is an upper die holding member, which functions to hold the upper die case 20 on the upper ram base 10.

In the molding apparatus configured as described above, FIG.
As shown in (a), the upper ram base 10 is held at its top dead center, and the state in which the upper ram base 10 is farthest from the lower ram base 30 is the molding standby state.

When the second gear coarse material Ws is molded from the molding standby state described above, first, the work base 3
By fitting the portion C 'corresponding to the cone portion into the positioning accommodating hole 35c of No. 5, the axis of the second gear crude material Ws is arranged so as to match the axis of the work base 35.

At this time, the outer peripheral surface of the tapered spline tooth forming die 40 comes into contact with the regulating hole 36 a of the chuck holder 36 by the elastic force of each cylindrical portion 45 and the pressing force of the knockout spring member 37. Yes,
Since the inner end of each tapered spline tooth forming portion 43 is slightly interposed between the straight spline teeth Ss, the tapered spline tooth forming portion 43 and the second gear coarse material Ws are eventually connected. Is also performed in the circumferential direction at the same time. At this time, the distance between the upper end surface of the second gear coarse shaped material Ws disposed on the work base 35 and the front end surface of the second cylindrical portion 17c of the work pusher 17 is determined by the distance between the front end surface of the chuck holder 36 and the chuck pusher. 16 is smaller than the distance from the tip end surface.

The second gear coarse material Ws is used for the work base 3
When the upper ram base 10 is moved downward by operating the forging press machine from the state where it is arranged in the position 5, as shown in the left part of the center line in FIG.
Abuts on the other side surface of the second gear coarse material Ws, so that the second gear coarse material Ws is located between the work base 35 and the work pusher 17.
Will be positioned and held.

At this time, the tapered spline tooth forming section 4
3 has an inclined cam hole 16 of a chuck pusher 16.
b is occupied only, and the tapered spline tooth forming portions 43 are still held in a mutually expanded state.

From the above-described state, the upper ram base 10 is further moved.
Is moved downward, the inclined cam surface 1 of the chuck pusher 16 is moved.
6c, the tapered spline tooth forming portions 43 gradually form an arc shape starting from the base end of the thin portion against the elastic force of each tubular portion 45 and the elastic force of the knockout spring member 37. When the upper ram base 10 reaches the bottom dead center, the insertion hole 16a of the chuck pusher 16 occupies the outer peripheral area of the tapered spline tooth forming part 43, and the tapered The spline tooth forming portions 43 are held in a state of being close to each other.

In this state, each of the tapered spline tooth forming portions 43 is pressed with a large force between the straight spline teeth Ss of the second gear coarse material Ws. The spline teeth Ss are plastically deformed, and the tapered spline teeth Ts are formed according to the shape of the tapered spline tooth forming section 43 as shown in FIG.

During these operations, the work pusher 17 is appropriately moved upward with respect to the upper ram base 10 by the bending of the pressing spring 18, and the second gear coarse material W
s is held in contact with the other side surface.

As the operation of the forging press machine progresses from the above-described state, the upper ram base 10 gradually moves upward, and eventually returns to the state shown in FIG.

During this time, the tapered spline tooth forming die 40
When the chuck pusher 16 deviates from the outer peripheral area, the elastic restoring force of each tubular portion 45 and the elastic restoring force of the knockout spring member 37 return to the state in which the tapered spline tooth forming portions 43 are mutually expanded. Therefore, the second gear coarse shaped material Ws after the molding is completed,
That is, the second gear semi-molded product W as shown in FIG.
h can be easily taken out of the work base 35, and the next second gear coarse material Ws can be arranged.

By repeating the above-described operation, the tapered spline teeth Ts are sequentially formed on the second gear coarse material Ws.

As described above, according to the molding apparatus, the second gear coarse material Ws disposed in the positioning receiving hole 35c of the work base 35 extends along the axis so as to surround the axis. A plurality of cylindrical portions 45 are provided with tapered spline tooth forming portions 43 which expand in a normal state on the inner peripheral surfaces of the respective tip portions, and these tapered spline teeth are moved by the chuck pusher 16 which moves along the axis described above. Since the tooth forming portions 43 are held close to each other, a moving area for expanding and contracting the tapered spline tooth forming portion 43 is provided in the outer peripheral region of the second gear coarse material Ws, and Chuck pusher 16
It is only necessary to secure an area for moving along the axial direction, so that it is possible to prevent the device from becoming large.

In addition, according to the above-mentioned forming device, the tapered spline tooth forming portions 43 are mutually expanded and contracted by utilizing the elastic force of the cylindrical portion 45. It is not necessary to prepare a guide processed with high precision for guiding the movement, and it is possible to prevent a situation in which the manufacturing cost is significantly increased.

In the above-described embodiment, an apparatus for forming the tapered spline teeth Ts of the second gear W is illustrated. However, the present invention is not limited to this. For example, as shown in FIG. , A shaft and a clutch gear integrally formed, for example, a tapered spline tooth Ts of a main shaft M formed integrally with a spline shaft St, a bearing Ju and an input gear Gi used in a transmission for a four-wheeled vehicle. Molding is also possible.

FIG. 8 exemplifies a forming apparatus for forming the above-mentioned coarse material Ms of the main shaft M.

In this forming apparatus, a member corresponding to the guide shaft 14 of the forming apparatus shown in FIG.
Is applied as a work pusher shaft (holding member) 50 having the same outer diameter as the spline shaft-equivalent portion St ', and a member obtained by integrally molding a member corresponding to the guide ring 15 and the sleeve 12 is applied as a sleeve body 51. A guide hole 51a for accommodating a spline shaft equivalent portion St 'and a bearing equivalent portion Ju' of the crude material Ms is formed at the center. This guide hole 51a
Is the upper end formed with a smaller diameter than the base end,
The upper end has an inner diameter substantially the same as the outer diameter of the work pusher shaft 50 and a portion St 'corresponding to the spline shaft in the coarse material Ms. The other configuration including the tapered spline tooth forming die 40 is the same as that of the forming apparatus shown in FIG. 1, and the tapered spline teeth Ts are formed on the rough material Ms by the same operation. The same components are denoted by the same reference numerals, and their detailed configurations and operations will not be described.

In the forming apparatus shown in FIG. 8, the tapered spline tooth forming section 43 is also provided on the outer peripheral area of the coarse material Ms.
Moving area for expanding and contracting, and chuck pusher 1
Since it is sufficient to secure a region for moving the shaft 6 along the axial direction, it is possible to prevent the device from being enlarged, and to form each tapered spline tooth using the elastic force of the cylindrical portion 45. Since the parts 43 are mutually expanded and contracted, it is not necessary to prepare a guide processed with high precision for guiding the movement of the tapered spline tooth forming part 43, and it is possible to prevent a situation in which the manufacturing cost is significantly increased. be able to.

In each of the above-described embodiments and modified examples, a slit is formed in a cylindrical portion integrally formed in a cylindrical shape in advance to form an elastic tongue piece whose base ends are connected to each other. Therefore, it is not necessary to position these elastic members when manufacturing the device, and it is possible to reduce the manufacturing cost.

However, according to the present invention, the elastic tongues may be individually formed and arranged in a cylindrical shape centered on the axis of the coarse material having the positioning and holding. Each base end may be fixedly held, and even with such a configuration, the same operation and effect as those of the above-described molding apparatus can be expected.

In each of the above-described embodiments and modified examples, a knockout spring member is used. Therefore, when the tapered spline tooth forming portion is in a state of being bitten by the coarse material, the knockout spring member is used. Although this can be reliably released by the elastic restoring force of the knockout spring member, it is not always necessary to apply the knockout spring member in the present invention.

[0070]

As described above, according to the present invention,
A tapered spline tooth forming portion that normally expands on the inner peripheral surface of each of the distal ends of a plurality of elastic members extending along the axis so as to surround the axis of the crude material positioned and held at the processing position. Is provided, and the tapered spline tooth forming portions are held in a state of being brought close to each other by the pressing member moving along the axis described above. Since it is sufficient to secure a moving area for the expansion and contraction of the spline-shaped tooth forming portion, and an area for the pressing member to move along the axial direction,
It is possible to prevent a situation in which the device becomes large.

Further, since the respective tapered spline tooth forming portions are mutually expanded and contracted by utilizing the elastic force of the elastic member, the processing is performed with high precision for guiding the movement of the tapered spline tooth forming portions. It is not necessary to prepare a guide, and it is possible to prevent a situation in which the manufacturing cost is significantly increased.

[Brief description of the drawings]

FIG. 1 is a sectional view conceptually showing one embodiment of a tapered spline tooth forming apparatus according to the present invention.

FIG. 2 is a sectional view conceptually showing a main part of the tapered spline tooth forming apparatus shown in FIG.

FIG. 3 is a view taken in the direction of arrows III in FIG. 2;

FIG. 4 is an enlarged view of a part IV in FIG.

FIG. 5 is a view taken in the direction of arrow V in FIG. 4;

6 is a conceptual diagram showing a manufacturing process of a clutch gear to which the tapered spline tooth forming device shown in FIG. 1 is applied.

FIG. 7 is a sectional view conceptually showing a second gear of a transmission for a four-wheeled vehicle formed by applying the tapered spline tooth forming apparatus shown in FIG. 1;

FIG. 8 is a sectional view conceptually showing a modified example of the tapered spline tooth forming apparatus according to the present invention.

9 is a sectional view conceptually showing a main shaft of a transmission for a four-wheeled vehicle formed by applying the tapered spline tooth forming device shown in FIG.

FIG. 10 is a sectional view conceptually showing a conventional tapered spline tooth forming apparatus.

[Explanation of symbols]

 Reference Signs List 16: chuck pusher 17: work pusher 35: work base 43: tapered spline tooth forming part 45: cylindrical part 50: work pusher shaft Ss: straight spline tooth Ts: tapered spline tooth Ws, Ms: coarse material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Nakamura 300 Takatsuka-cho, Hamamatsu-shi, Shizuoka Suzuki Co., Ltd. (72) Inventor Takeshi Takeshi 192-1, East of Hamaigawa character house in Igawa-cho, Igawa-machi, Minami-Akita-gun, Akita Suzuki Parts Akitanai

Claims (1)

[Claims] 1. A rough shaped material having a plurality of straight spline teeth parallel to each other formed on an outer peripheral surface thereof in advance along an axial direction.
The rough member is positioned and held at a predetermined processing position by bringing the holding members into contact with both end surfaces thereof, and from this state, the tapered spline tooth forming portion is pressed against the straight spline teeth of the rough member. Accordingly, in the tapered spline tooth forming apparatus configured to form the straight spline teeth into the tapered spline teeth, each of the linear spline teeth surrounds the axis of the coarse material positioned and held at the processing position. Each of the tapered spline tooth forming portions extends along the axis and is provided on the inner surface of each of the distal end portions. , While being arranged at a position separated from the straight spline teeth of the coarse material that is positioned and held at the processing position, the respective tips are opposed to individual elastic forces. When they are brought close to each other, they form a substantially cylindrical shape centered on the axis of the coarse material, and each tapered spline tooth forming part is arranged at a position where it comes into contact with a straight spline tooth of the coarse material, respectively. A plurality of elastic tongues to be provided, and a plurality of tapered splines disposed so as to be movable along the axis of the coarse material positioned and held at the processing position so as to be in contact with and separated from the outer peripheral surface of the plurality of elastic tongues. A pressure member for holding the respective tips in a state of being close to each other against the elastic force of the elastic tongue when occupied in the outer peripheral area of the tooth forming portion. Tooth forming equipment.