JP6460392B2 - Method and apparatus for manufacturing pulley for continuously variable transmission - Google Patents

Description

  The present invention relates to a technique for manufacturing a pulley for a continuously variable transmission and a manufacturing apparatus.

A technique for manufacturing a pulley for continuously variable transmission by hot forging is known.
As shown in FIG. 6, the continuously variable transmission pulley 1 is a metal member having an axisymmetric shape about the axis X and having a cone surface 2, a skirt portion 3, a shaft portion 4, and the like. . The continuously variable transmission pulley 1 constitutes one pulley by a movable pulley and a fixed pulley, and the continuously variable transmission pulley 1 illustrated here is a movable pulley.
As a prior art related to the method of manufacturing the continuously variable transmission pulley 1, for example, there is a technique disclosed in Patent Document 1 shown below.

In the conventional method for manufacturing a continuously variable transmission pulley disclosed in Patent Document 1, a continuously variable transmission pulley manufacturing apparatus 30 as shown in FIG. 7 is used. The conventional continuously variable transmission pulley manufacturing apparatus 30 is an apparatus for manufacturing the continuously variable transmission pulley 1 (see FIG. 6) by hot forging the material 5, and includes a forming roller 31, a die 32, and a drive shaft 33. Etc.
A conventional continuously variable transmission pulley manufacturing apparatus 30 includes an axis X that is a rotation axis of a material 5 that is a base of a continuously variable transmission pulley 1 and a rotation of a forming roller 31 that forms a cone surface 2. The axial centers Y, which are axial centers, are configured to be orthogonal to each other.

Then, in the conventional method for manufacturing a continuously variable transmission pulley, the forming roller 31 is displaced parallel to the axis X of the material 5 (in the direction of the arrow Z) while rotating the material 5 about the axis X, By pressing the roller surface 31 a of the forming roller 31 against the material 5, the forming roller 31 is driven to rotate to form the cone surface 2.
The continuously variable transmission pulley 1 illustrated here is a movable pulley, but the method of forming the cone surface is substantially the same for the fixed pulley.

In the prior art according to Patent Document 1, when the cone surface 2 is formed, the cone surface 2 is formed without using a large forging die by sequentially forming the cone surface 2 by pressing the forming roller 31 against the cone surface 2. Therefore, the molding load is reduced.
In the conventional method for manufacturing a continuously variable transmission pulley according to Patent Document 1, the radius of the forming roller 31 is increased in proportion to the radius of the cone surface 2 along the radial direction of the cone surface 2. As a configuration in which slip does not occur between the forming roller 31 and the cone surface 2, premature wear and seizure of the forming roller 31 and generation of molding defects are suppressed.

  However, in the prior art according to Patent Document 1, since the axis X of the material 5 and the axis Y of the forming roller 31 are orthogonal to each other, the diameter of the forming roller is relatively small, and the forming roller is broken. There was a problem of fear of doing.

Japanese Patent Application Laid-Open No. 2006-218496

  The present invention has been made in view of such a current problem, and for a continuously variable transmission that can reliably prevent breakage of the forming roller while preventing slippage between the forming roller and the cone surface. It is an object of the present invention to provide a pulley manufacturing method and manufacturing apparatus.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the method for manufacturing a pulley for a continuously variable transmission according to the present invention is a roller that is in contact with the material while rotating a substantially cylindrical material around an axis, and is in contact with the inner side of the material in the radial direction. A molding roller whose diameter is smaller than the diameter of the part that is in contact with the outer side in the radial direction of the material is pressed against the end surface of the material in a direction parallel to the axial direction of the material. A pulley for a continuously variable transmission in which the forming roller is driven to rotate and a cone surface is formed by the forming roller, wherein the ratio between the minimum diameter and the maximum diameter of the cone surface, The roller diameter of the portion in contact with the minimum diameter position on the cone surface and the ratio of the roller diameter of the portion of the forming roller in contact with the maximum diameter position on the cone surface are matched, and the forming roller is made to have a radius of the material. From direction outwardly toward the radially inward, the axis of the shaped roller, always is inclined with respect to the axis of the material so as to previously lowered with respect to the material, to molding the cone surface Features.

The continuously variable transmission pulley manufacturing apparatus according to the present invention includes a die that holds a substantially cylindrical material, a drive unit that rotationally drives the die, and a roller that contacts the material, and a radius of the material. A diameter of a portion that contacts the inner side in the direction is smaller than the diameter of a portion that contacts the outer side in the radial direction of the material, and a displacement portion that displaces the forming roller. While the material held by the die is rotated around the axis of the material by the drive unit, the forming roller is displaced by the displacement unit, and the forming roller is placed on an end surface of the material. A pulley for a continuously variable transmission that forms a cone surface by the forming roller that is driven and rotated in parallel with the axial direction of the shaft, wherein the forming roller has a minimum diameter of the cone surface. Diameter And the ratio of the roller diameter of the part of the forming roller that contacts the minimum diameter position on the cone surface and the ratio of the roller diameter of the part of the forming roller that contacts the maximum diameter position of the cone surface match, and From the radially outer side of the material toward the radially inner side, the axis of the forming roller is inclined with respect to the axis of the material so as to always descend first with respect to the material.

  As effects of the present invention, the following effects can be obtained.

  According to the method and apparatus for manufacturing a continuously variable transmission pulley according to the present invention, it is possible to reliably prevent breakage of the forming roller while preventing slippage between the forming roller and the cone surface.

The schematic diagram which shows the manufacture condition of the pulley for continuously variable transmission by the manufacturing apparatus of the pulley for continuously variable transmission which concerns on 1st embodiment of this invention. The schematic diagram which shows the dimension of the forming roller in the manufacturing apparatus of the pulley for continuously variable transmission which concerns on 1st embodiment of this invention. The schematic diagram which shows the manufacture condition of the pulley for continuously variable transmission by the manufacturing apparatus of the pulley for continuously variable transmission which concerns on 2nd embodiment of this invention. The schematic diagram which shows the dimension of the forming roller in the manufacturing apparatus of the pulley for continuously variable transmission which concerns on 2nd embodiment of this invention. The schematic diagram which shows the manufacturing condition (when the raw material without a hole is used) of the pulley for continuously variable transmission by the manufacturing apparatus of the pulley for continuously variable transmission which concerns on 1st embodiment of this invention. The schematic diagram which shows the pulley for continuously variable transmissions. The schematic diagram which shows the manufacturing condition of the pulley for continuously variable transmission by the manufacturing apparatus of the conventional pulley for continuously variable transmission.

Next, embodiments of the invention will be described.
First, a continuously variable transmission pulley manufacturing apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, a continuously variable transmission pulley manufacturing apparatus 10 according to a first embodiment of the present invention hot-forges a material 5 to manufacture a continuously variable transmission pulley 1 (see FIG. 6). The apparatus includes a forming roller 11, a die 12, a drive shaft 13, and a forming roller 14.

  The forming roller 11 is a roller member having a truncated cone shape or a conical shape for forming the cone surface 2 in the continuously variable transmission pulley 1, and includes a roller surface 11 a for forming the cone surface 2, and a die 12. Is supported by a displacement unit (not shown) so as to be displaceable in a direction parallel to the axis X.

The forming roller 11 has an axisymmetric shape with the axis Y as a center, and a shape in which the roller diameter is gradually changed in the direction of the axis Y.
The forming roller 11 may be any roller surface having a roller surface 11a formed at least in a range corresponding to the cone surface 2 in the direction of the axis Y. For example, as shown in FIG. A configuration in which cylindrical shaft portions are continuously formed in the outer range in the direction of the axis Y may be employed.

In the continuously variable transmission pulley manufacturing apparatus 10, the molding roller 11 has a large diameter side directed radially outward with respect to the material 5, and a molding roller 11 has a small diameter side directed radially inward with respect to the material 5. 11 is disposed above the material 5, and the axis Y is inclined with respect to the axis X of the material 5 so as to be lowered with respect to the material 5 from the large diameter side toward the small diameter side. The inclination angle of the axis Y with respect to the axis X is θ1. The inclination angle θ1 of the axis Y with respect to the axis X can be appropriately selected within the range of 0 ° <θ1 <90 °.
In the continuously variable transmission pulley manufacturing apparatus 10, the inclination angle θ1 is set to 30 °.

The forming roller 11 is pressed against the upper end of the material 5 by being displaced in a direction parallel to the axis X of the material 5 (in the direction of arrow Z) by the displacement portion (not shown). Then, the cone surface 2 is formed by plastically deforming the portion of the material 5 where the roller surface 11a is pressed.
Note that the axis Y of the forming roller 11 in the continuously variable transmission pulley manufacturing apparatus 10 intersects with the axis X of the material 5 and is not in a torsional relationship.

  The die 12 is a roller body for molding the back surface of the cone surface 2 in the continuously variable transmission pulley 1 and is pressed against the back side of the portion of the material 5 where the molding roller 11 is disposed. The material 5 is pressed between the forming roller 11 and the die 12 so that the cone surface 2 and the back side of the cone surface 2 are formed into a predetermined shape. The dice 12 are arranged in a range including the back side of the portion of the material 5 where the forming roller 14 is pressed.

The drive shaft 13 is a shaft member for rotationally driving the die 12. A concave shape corresponding to the convex shape of the lower surface of the die 12 is formed on the upper surface of the drive shaft 13. In a state where the dice 12 are fitted, the axial centers of the dice 12 and the drive shaft 13 are configured to coincide with each other at the axial center X.
The die 12 is driven to rotate about the axis X by driving the drive shaft 13 to rotate by a rotating mechanism (not shown).

  The forming roller 14 is a roller body for forming the side surface of the skirt portion 3 in the continuously variable transmission pulley 1, is pressed against the front side surface of the material 5, and is driven to rotate as the material 5 rotates. Then, the material 5 is rotated around the axis X while being pressed between the forming roller 14 and the die 12, so that the skirt portion 3 is formed into a predetermined shape.

  The continuously variable transmission pulley manufacturing apparatus 10 further includes other rollers (not shown) for forming the skirt portion 3 and the shaft portion 4 in addition to the forming roller 11, the die 12, and the forming roller 14.

  In this embodiment, as shown in FIG. 2, a portion having the smallest diameter in the completed cone surface 2 is defined as a portion P, and a portion having the largest diameter in the completed cone surface 2 is defined as a portion Q. The minimum diameter of the cone surface 2 at the part P is defined as φA1, and the maximum diameter of the cone surface 2 at the part Q is defined as φA2.

  Further, in the continuously variable transmission pulley manufacturing apparatus 10, a part that contacts the part P in the roller surface 11 a of the forming roller 11 is defined as a part R, and a part that contacts the part Q in the roller surface 11 a is defined as a part S. The diameter of the forming roller 11 in the region R is defined as φB1, and the diameter of the forming roller 11 in the region S is defined as φB2.

  In the continuously variable transmission pulley manufacturing apparatus 10, the ratio of the diameter of the part R to the part S (φB 2 / φB 1) on the roller surface 11 a of the forming roller 11 is set to the ratio of the diameter of the part P to the part Q on the cone surface 2. It is equal to (φA2 / φA1) (that is, φA2 / φA1φ = φB2 / φB1).

  In the continuously variable transmission pulley manufacturing apparatus 10, the roller surface 11 a of the forming roller 11 is configured such that the forming roller 11 is inclined so that the axis Y is inclined downward from the large diameter side toward the small diameter side. The ratio of the diameter of the part R to the part S (φB2 / φB1) in FIG. 5 is equal to the ratio of the diameter of the part P to the part Q in the cone surface 2 (φA2 / φA1), while the conventional forming roller 11 (see FIG. 7). The roller diameter can be increased as compared with the above.

  In the continuously variable transmission pulley manufacturing apparatus 10, the ratio of the diameter of the part R to the part S (φB 2 / φB 1) on the roller surface 11 a of the forming roller 11 is set to the ratio of the diameter of the part P to the part Q on the cone surface 2. By making it equal to (φA2 / φA1), the rotational speed at the part R of the forming roller 11 and the rotational speed at the part P of the material 5 are matched, and the rotational speed at the part S of the forming roller 11 and the part Q of the material 5 are matched. The rotational speeds are made to coincide with each other so that the forming roller 11 is reliably prevented from slipping with respect to the material 5 when the cone surface 2 is formed.

3 and 4 show a continuously variable transmission pulley manufacturing apparatus 20 according to a second embodiment of the present invention.
As shown in FIG. 3, the continuously variable transmission pulley manufacturing apparatus 20 according to the second embodiment of the present invention includes a forming roller 21, a die 22, a drive shaft 23, and a forming roller 24.
The continuously variable transmission pulley manufacturing apparatus 20 shown in FIG. 3 is different from the continuously variable transmission pulley manufacturing apparatus 10 (see FIG. 1) in the inclination angle of the forming roller 21. That is, in the continuously variable transmission pulley manufacturing apparatus 20, the inclination angle θ2 of the forming roller 21 is larger than the inclination angle θ1 of the forming roller 11 in the continuously variable transmission pulley manufacturing apparatus 10. The inclination angle θ2 between the axis X and the axis Y can be appropriately selected within the range of 0 ° <θ2 <90 °.
In the continuously variable transmission pulley manufacturing apparatus 20, the diameter of the forming roller 21 is smaller than that of the forming roller 11 of the continuously variable transmission pulley manufacturing apparatus 10.
In the continuously variable transmission pulley manufacturing apparatus 20, the inclination angle θ2 is set to 60 °.

  In the continuously variable transmission pulley manufacturing apparatus according to the present invention, in consideration of the molding load required for the molding roller and the restrictions on the arrangement space of the continuously variable transmission pulley manufacturing apparatus, the inclination angle of the molding roller and the molding roller The diameter can be set as appropriate. The inclination angle θ of the axis Y of the forming roller with respect to the axis X of the raw material is 30 ° ≦ θ ≦ from the viewpoint of ensuring the diameter of the forming roller without unnecessarily increasing the diameter of the forming roller. The angle is preferably 60 °.

In the continuously variable transmission pulley manufacturing apparatus 20, as shown in FIG. 4, the diameter at the portion R of the roller surface 21 a of the forming roller 21 is φC 1 corresponding to the inclination angle θ 2, and the roller surface of the forming roller 21. The diameter of the portion S of 21a is φC2, and the ratio of the diameter of the portion R to the portion S on the roller surface 21a (φC2 / φC1) is equal to the ratio of the diameter of the portion P to the portion Q of the cone surface 2 (φA2 / φA1). (That is, φA2 / φA1φ = φC2 / φC1).
When the diameters of the forming roller 11 and the forming roller 21 are compared, φB1> φC1 and φB2> φC2.

  That is, in the pulley manufacturing apparatus for a continuously variable transmission according to the present invention, the diameter at the part R and the diameter at the part S of the forming roller are appropriately set according to the inclination angle of the axis Y of the forming roller with respect to the axis X. Thus, the molding roller can be prevented from slipping during the molding of the cone surface while preventing the molding roller from being broken.

  That is, a continuously variable transmission pulley manufacturing apparatus 10 according to an embodiment of the present invention includes a die 12 that holds a substantially cylindrical material 5, a drive shaft 13 that is a drive unit that rotationally drives the die 12, and a material 5. A forming roller 11 having a diameter smaller than a diameter of a portion of the material 5 in contact with the outer side in the radial direction of the material 5, and a forming roller. A displacement portion that displaces 11, and the forming roller 11 is displaced by the displacement portion while rotating the material 5 held by the die 12 around the axis X of the material 5 by the drive shaft 13. The cone surface 2 is molded by the driven rotating molding roller 11 by pressing the molding roller 11 against the end surface of the material 5 in parallel to the direction of the axis X of the material 5. The ratio (φA2 / φA1) of the minimum diameter φA1 and the maximum diameter φA2 of the toner surface 2, the roller diameter φB1 of the portion R in contact with the minimum diameter position P on the cone surface 2 of the forming roller 11, and the cone surface 2 of the forming roller 11 Is the same as the ratio (φB2 / φB1) of the roller diameter φB2 of the portion S in contact with the maximum diameter position Q (that is, φA2 / φA1φ = φB2 / φB1), and from the radially outer side of the material 5 to the radially inner side On the other hand, the axis Y of the forming roller 11 is inclined with respect to the axis X of the material 5 so as to be lowered with respect to the material 5.

  And according to the pulley manufacturing apparatus 10 for continuously variable transmission of such a structure, it is possible to prevent the molding roller 11 from being broken while preventing slippage between the molding roller 11 and the cone surface 2. .

Next, a method for manufacturing the continuously variable transmission pulley 1 according to the embodiment of the present invention when the continuously variable transmission pulley manufacturing apparatus 10 is used will be described.
In addition, although the manufacturing method of the continuously variable transmission pulley 1 is demonstrated using the continuously variable transmission pulley manufacturing apparatus 10 which concerns on 1st embodiment here, the continuously variable transmission which concerns on 2nd embodiment is demonstrated. Even when the machine pulley manufacturing apparatus 20 is used, the continuously variable transmission pulley 1 can be manufactured by the same manufacturing method.

As shown in FIG. 1, in the method of manufacturing the continuously variable transmission pulley 1 according to the embodiment of the present invention, first, the material 5 is set on the die 12, and the die 12 is driven by the drive shaft 13. The material 5 is rotated around the axis X.
Then, in a state where the material 5 is rotating, the forming roller 11 is made to approach the material 5 from above in the direction of the arrow Z by a displacement mechanism (not shown) and is brought into contact with the upper end portion of the material 5.
At this time, the forming roller 11 is driven and rotated by the rotation of the material 5 and rotates about the axis Y.

  Then, while the forming roller 11 is driven to rotate by the rotation of the material 5, the forming roller 11 is further displaced in the direction of the arrow Z, and a predetermined forming load is applied to the material 5 to cause plastic deformation. The cone surface 2 having the copied shape can be formed.

  In the manufacturing method of the continuously variable transmission pulley 1 according to the embodiment of the present invention, when the cone surface 2 is formed while the forming roller 11 is driven to rotate by the rotation of the material 5, the forming roller 11 is interposed between the forming roller 11 and the material 5. Since slip does not occur, molding failure and seizure hardly occur on the cone surface 2, and a continuously variable transmission pulley 1 with good quality can be obtained, and wear of the molding roller 11 can be suppressed. Also, the running cost can be reduced.

  Furthermore, in the method for manufacturing the continuously variable transmission pulley 1 according to the embodiment of the present invention, the molding roller 11 having a larger diameter than the conventional one (see FIG. 7) can be used. It is possible to prevent the forming roller 11 from being broken when a forming load is applied to 5.

  That is, the continuously variable transmission pulley manufacturing method according to an embodiment of the present invention is a roller that is in contact with the material 5 while rotating the substantially cylindrical material 5 around the axis X. The forming roller 11 having a diameter smaller than the diameter of the portion in contact with the outer side in the radial direction of the material 5 is set on the end surface of the material 5 with the axis X of the material 5. This is a manufacturing method in which the cone surface 2 is formed by a forming roller 11 that is driven and rotated in a direction parallel to the direction, and the ratio (φA2 / φA1) between the minimum diameter φA1 and the maximum diameter φA2 of the cone surface 2 The ratio (φB2 / φB1) of the roller diameter φB1 of the part R in contact with the minimum diameter position P on the cone surface 2 of the forming roller 11 and the roller diameter φB2 of the part S in contact with the maximum diameter position Q on the cone surface 2 of the forming roller 11 (That is, φA2 (φA1φ = φB2 / φB1) and the forming roller 11 is directed from the radially outer side to the radially inner side of the material 5 so that the axis Y of the forming roller 11 is relative to the material 5 on the side where the cone surface 2 is formed. The cone surface 2 is formed by being inclined with respect to the axis X of the material 5 so as to be lowered first.

  And according to the manufacturing method of the pulley for continuously variable transmission of such a structure, it is possible to reliably prevent the molding roller 11 from being broken while preventing slippage between the molding roller 11 and the cone surface 2. .

Moreover, in the manufacturing method of the pulley 1 for continuously variable transmission which concerns on one Embodiment of this invention, using the raw material 6 of the aspect by which the hole is not penetrated in the shaft part 4 as shown in FIG. 5, continuously variable transmission Pulley 1 can be manufactured.
When the continuously variable transmission pulley 1 is manufactured using the material 6 having such a configuration, when the cone surface 2 is formed, deformation other than the cone surface 2 (particularly the shaft portion 4) is not affected. There is an advantage that the shape accuracy of the pulley 1 for the step transmission can be further increased.
When the continuously variable transmission pulley 1 is manufactured using the material 6, after forming the cone surface 2, a hole is formed in the shaft portion 4 by punching with a press or the like.

DESCRIPTION OF SYMBOLS 1 Pulley for continuously variable transmission 2 Cone surface 5 Material 10 Pulley manufacturing apparatus for continuously variable transmission (first embodiment)
11 Forming roller 12 Die 13 Drive shaft (drive part)

Claims (2)

While rotating a substantially cylindrical material around its axis,
A molding roller having a diameter that is smaller than a diameter of a portion that is in contact with the inner side in the radial direction of the material, and a diameter of a portion that is in contact with the outer side in the radial direction of the material; A method of manufacturing a pulley for a continuously variable transmission that presses an end surface of a material in a direction parallel to the axial direction of the material to rotate the forming roller in a driven manner and forms a cone surface by the forming roller. And
The ratio of the minimum diameter to the maximum diameter of the cone surface;
The ratio of the roller diameter of the part that contacts the minimum diameter position on the cone surface of the forming roller and the ratio of the roller diameter of the part that contacts the maximum diameter position of the cone surface of the forming roller;
And match
The forming roller,
From the radially outer side of the material toward the radially inner side, the axis of the molding roller is inclined with respect to the axis of the material so that it always falls first with respect to the material,
Forming the cone surface;
A method of manufacturing a pulley for a continuously variable transmission. A die holding a substantially cylindrical material;
A drive unit for rotationally driving the die;
A roller in contact with the material, and a forming roller having a diameter smaller than a diameter of a portion in contact with the outer side in the radial direction of the material, the diameter of the portion in contact with the inner side in the radial direction of the material;
A displacement part for displacing the forming roller;
With
While the material held by the die is rotated around the axis of the material by the drive unit, the forming roller is displaced by the displacement unit, and the forming roller is placed on an end surface of the material. A pulley for a continuously variable transmission that presses parallel to the axial direction of the shaft and forms a cone surface by the driven rotating roller.
The forming roller is
The ratio of the minimum diameter to the maximum diameter of the cone surface;
The ratio of the roller diameter of the part that contacts the minimum diameter position on the cone surface of the forming roller and the ratio of the roller diameter of the part that contacts the maximum diameter position of the cone surface of the forming roller;
Are matched, and
From the radially outer side of the material toward the radially inner side, the axis of the forming roller is inclined with respect to the axis of the material so as to always fall first with respect to the material.
An apparatus for producing a pulley for a continuously variable transmission.

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