JPH07115105B2 - Multi-stage multi-groove V pulley and method for manufacturing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-groove V-pulley portion having a structure in which a plurality of V-grooves extending in the circumferential direction are formed in the axial direction and a boundary portion is defined by a separation band. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottomed cylindrical multi-stage multi-groove V pulley formed on the outer peripheral surface of a cylinder wall, and a method for manufacturing the same. More specifically, it is formed by rolling a preform obtained from a predetermined metal plate material. The multi-stage multi-groove V pulley is preferably a new multi-stage multi-groove V pulley in which the distance between adjacent multi-groove V pulley portions can be set larger than before, and a multi-stage multi-groove V pulley having the new structure is suitable. It relates to a method for manufacturing.

(Background Art) A multi-stage multi-groove V pulley having a structure having a plurality of multi-groove V pulley portions on the outer peripheral surface of the cylinder wall as described above is manufactured by casting a bottomed cylindrical pulley material having a cylinder wall portion, It can be manufactured by cutting the cylindrical wall portion of the pulley material. However, the method employing such a cutting process has a problem that the material yield is low, the manufacturing efficiency is low, the productivity is inferior, and the product weight is heavy.

Therefore, in recent years, in Japanese Patent Laid-Open No. 62-28036, a bottomed cylindrical preform obtained from a predetermined metal plate material is rolled to manufacture a multi-stage multi-groove V pulley having the above-described configuration. A method has been proposed. If the multi-stage multi-groove V pulley is manufactured according to the method disclosed in this publication,
The material yield can be improved, the productivity can be improved, and the product weight can be reduced as compared with the case where the multistage multigroove V pulley is manufactured by cutting.

However, the method of manufacturing a multi-stage multi-groove V pulley disclosed in this publication forms a separation band, which is a common thick wall portion, at the boundary between adjacent multi-groove V pulleys, and the adjacent multi-grooves are formed. Since the boundary of the V-pulley portions is defined by the common separation band, it can be applied to the manufacturing of a product having a narrow interval (angle separation distance) between the adjacent multi-groove V-pulley parts. If the spacing between the grooved V-pulley portions becomes larger than a certain amount, it becomes impossible to form a separation band having a width corresponding to the spacing between the multi-groove V-pulley portions. However, there is a problem that the method cannot be applied to those that must be formed.

(Problem to be Solved) Here, the present invention has been made in view of such circumstances, and the problem to be solved is a structure which can be advantageously manufactured by a rolling method. ,
Moreover, it is an object of the present invention to provide a multi-stage multi-groove V pulley having a structure in which a separation distance between adjacent multi-groove V pulley portions can be set sufficiently larger than that of a conventional multi-stage multi-groove V pulley manufactured by a rolling method. Another object of the present invention is to provide a method for suitably manufacturing a multi-stage multi-groove V pulley having such a structure.

(Solution) In order to solve such a problem, in the present invention, as described above, the multi-groove V pulley portion having a structure in which a plurality of V grooves extending in the circumferential direction are formed in the axial direction is a boundary. Cylindrical bottomed formed by rolling a bottomed cylindrical preform obtained from a predetermined metal plate material with a structure formed on the outer surface of the cylinder wall in a state where parts are defined by separation bands In the multi-stage multi-groove V pulley, the separation bands that define the boundaries of the multi-groove V pulley parts are formed independently for each multi-groove V pulley part, and the separation bands of the multi-groove V pulley parts that are adjacent in the axial direction are formed. A non-V groove forming band having a predetermined width is formed between them, and the multi-groove V pulley portions adjacent to each other in the axial direction are provided separated by the non V groove forming band.

Further, according to the first method of the present invention, in manufacturing the multi-stage multi-groove V pulley having such a structure, (a) a cylinder of a bottomed cylindrical preform obtained from a predetermined metal plate material. By pressing the two bending rollers against the wall, the abutting portion of the bending rollers is made into a recessed portion that is recessed radially inward, while the cylindrical wall portion between the recesses has a predetermined length. And (b) between the concave portions of the cylindrical wall of the bent product with respect to the cylindrical wall of the bent product obtained in the bending step, and (b) forming a bent product having a cylindrical shape. A thickening roller having a structure in which a plurality of concave grooves extending in the circumferential direction are provided at positions corresponding to the cylindrical portion and are separated from each other by a predetermined distance in the axial direction is pressed against the thickening roller to increase the thickness of the cylindrical wall. By molding, at the portions corresponding to the respective concave grooves of the thickening roller, A thickness increasing step of forming a thickness increasing product having a structure in which a ridge extending in the direction is formed; and (c) A groove extending in the circumferential direction is provided at a portion corresponding to each ridge, and a portion corresponding to each formation portion of the multi-groove V pulley portion defined by the ridges is provided. ,
A groove cutting roller having a structure provided with a plurality of V ribs is pressed against each other to form a separation band on each convex portion of the thickened product, and each multi-groove V pulley portion defined by the convex stripe portion is pressed. A groove cutting step of forming a plurality of V grooves in each of the forming portions and forming a plurality of multi-groove V pulley portions on the cylinder wall is included.

Further, according to the second method of the present invention, in manufacturing a multi-stage multi-groove V pulley having the same structure, (d) a cylindrical wall of a bottomed cylindrical preform obtained from a predetermined metal plate material. On the other hand, by bending three or more bending rollers to make the contact portions of the bending rollers concave inward in the radial direction, a bending product is formed in which the cylindrical wall is unevenly bent in the radial direction. And (e) with respect to the bent cylindrical wall obtained in the bending step, a groove extending in the circumferential direction is located at a portion corresponding to the bent convex portion of the bent cylindrical wall. In the direction corresponding to each of the concave grooves of the thickness-increasing roller, a plurality of thickness-increasing rollers having a structure provided at predetermined distances from each other are pressed against each other to increase the thickness of the cylinder wall. Thickening for molding thickened products with a structure in which ridges extending in the circumferential direction are formed And (f) with respect to the cylindrical wall of the increased-thickness product obtained in the thickening step, concave grooves extending in the circumferential direction at positions corresponding to the respective ridges of the increased-thickness product. And a multi-groove V defined by the ridges
A groove banding roller having a structure in which a plurality of V ribs are respectively provided is pressed against a portion corresponding to each formation portion of the pulley portion to form a separation band on each convex portion of the thickened product, And a groove cutting step of forming a plurality of V-grooves in the formation portion of each multi-groove V pulley section defined by the ridge and forming a plurality of multi-groove V pulley sections on the cylinder wall thereof. I did it.

(Operation) According to the multi-stage multi-groove V pulley according to the present invention, the separation distance between the adjacent multi-groove V pulleys is more than that of the conventional multi-stage multi-groove V pulley manufactured by the rolling method. The setting can be made large, and the multi-stage multi-groove V-pulley having such a structure can be favorably manufactured according to, for example, the first method or the second method of the present invention as described above.

That is, in the first method of the present invention, first,
Two bending rollers are pressed against the cylindrical wall of a bottomed cylindrical preform obtained from a predetermined metal plate material, and the abutting portions of the bending rollers are made into concave portions, and the cylinder between the concave portions is formed. A bent product having a structure in which a cylindrical portion of a predetermined length remains in the wall portion is molded. Then, a thickening roller having a plurality of concave grooves at a portion corresponding to the cylindrical portion is pressed against the cylindrical wall of the bent product, and a thickening product having a plurality of ridges on the cylindrical wall. A multi-groove V-pulley in which a groove is formed on the cylindrical wall of the increased-thickness product at a portion corresponding to each ridge of the increased-thickness product, and the boundary is defined by the ridges. A plurality of Vs are provided at corresponding parts of the part forming part.
A grooved reroller provided with ribs is pressed to form a plurality of multi-groove V-pulley portions whose boundaries are defined by separation bands and are spaced from each other by a sufficient distance in non-V groove formation bands having a predetermined width. .

Here, in the first method, as described above,
A cylindrical part is left on the cylinder wall of the bent product, and the thickened wall is provided with a plurality of recessed grooves at the portion corresponding to the cylindrical part of the cylinder wall of the bent product where the cylindrical part remains. Since the roller is pressed to increase the thickness of the cylinder wall of the bent product, the thickness of the cylinder wall can be sufficiently increased when the thickness increase product is formed by pressing the thickening roller. At the same time, the cylindrical wall of the bent product is satisfactorily pushed up and raised in each groove of the thickening roller, so that the ridge having a cross-sectional shape corresponding to each groove is satisfactorily formed. Therefore, when the groove cutting roller as described above is pressed against the cylindrical wall of such a thickened product to perform the groove cutting process, a plurality of multi-groove V pulley portions whose boundaries are defined by the separation bands have a predetermined width. It is possible to favorably manufacture the multi-stage multi-groove V-pulley having the structure according to the present invention, which is formed by the non-V-groove forming zones at a sufficient distance from each other.

Further, in the second method of the present invention, three or more bending rollers are pressed against the cylindrical wall of the bottomed cylindrical preform, and the abutting portions of the bending rollers are recessed portions. At the same time, at least one cylindrical wall portion between the recessed portions is formed with a bent convex portion that is curved and protrudes radially outward. Then, a thickening roller having a plurality of concave grooves at a portion corresponding to the bent convex portion is pressed against the cylindrical wall of the bent product in which the concave portion and the bent convex portion are formed, and the first method A thickened product similar to the thickened product molded according to is molded. Next, a groove cutting roller similar to the first method is pressed against the thickened product molded in this way, whereby a multi-stage multi-structure having a structure similar to that manufactured according to the first method is pressed. Groove V pulley is manufactured.

Here, like the second method, three or more bending rollers are pressed against the cylindrical wall of the bottomed cylindrical preform,
The abutting portions of the bending rollers are formed as concave portions, and at least one cylindrical wall portion between the concave portions is formed as a curved convex portion, and the curved wall of such a curved product is bent. Even if the thickening roller provided with a plurality of concave grooves is pressed against the portion corresponding to the convex portion to form the thickened product, the cylindrical wall of the thickened product is sufficiently good as in the first method. As the wall thickness is increased, the cylinder wall of the bent product is satisfactorily pushed up and raised in each groove of the thickness increasing roller, and the section corresponding to each groove of the thickness increasing roller is formed on the cylinder wall of the thickness increasing product. The ridge portion of the shape can be formed well. Therefore, if such a thickened product is subjected to the same grooving processing as in the first method, a plurality of multi-groove V pulleys whose boundaries are defined by separation bands are formed as in the first method. Thus, the multi-stage multi-groove V-pulley having the structure according to the present invention, in which the parts are formed with the non-V-groove forming zones having a predetermined width and separated from each other by a sufficient distance, can be well manufactured.

(Examples) In order to more specifically clarify the present invention,
Some embodiments will be described in detail with reference to the drawings.

First, FIG. 1 shows a half sectional view of a multi-stage multi-groove V pulley 2 according to the present invention. As is clear from the figure, the multi-stage multi-groove V-pulley 2 of the present embodiment has a substantially bottomed cylindrical shape as a whole, and the outer peripheral surface of the cylindrical wall 4 has an intermediate portion in the axial direction. At the position, a non-V groove forming band 6 which is a smooth cylindrical portion having a predetermined length is formed, and two multi-groove V pulley portions 8 and 10 are formed on both sides thereof. Then, the multi-groove V pulley portion 8 on the bottom wall portion 12 side of the multi-stage multi-groove V pulley 2
Between the separation zone 14 which is a thick wall section provided at the boundary with the non-V groove forming zone 6 and the flange section 16 provided at the end of the cylindrical wall 4 on the bottom wall section 12 side. In the above, four V grooves 20 extending in the circumferential direction are formed in the axial direction so as to be sandwiched between the separation band 14 and the flange portion 16 and the three V ribs 18 provided therebetween. The multi-groove V-pulley portion 10 on the opening side is provided with a separation band 22 similar to the separation band 14 provided at the boundary with the non-V groove forming band 6 and at the opening end of the cylindrical wall 4. The separation band between the flange 24 and
Five V-grooves 20 are formed by being sandwiched between 22 and the flange portion 24, and four V-ribs 18 provided therebetween.

Therefore, in the multi-stage multi-groove V pulley 2 having such a structure, the separation bands 14 and 22 are independently provided for the multi-groove V pulley portions 8 and 10, respectively, and between the separation bands 14 and 22. Since the non-V groove forming band 6 is provided at the position, the gap between the multi-groove V pulley portions 8 and 10 is larger than that of the conventional multi-stage multi-groove V pulley manufactured by the rolling method. The distance can be set extremely large.

By the way, the multi-stage multi-groove V pulley 2 having such a structure is manufactured according to the first method of the present invention, for example, according to the following procedure. That is, in manufacturing the multi-stage multi-groove V-pulley 2 having the above-described structure, first, a predetermined deep drawing process or the like is performed on a metal plate material punched out in a circular shape, so as to be shown in FIG. As is said,
A preform 26 having a substantially bottomed cylindrical shape is formed. And as shown in the figure, this preform 26
Is set in a rolling processing apparatus including a lower portion 28 and an upper portion 30 and a pad member 32 penetrating the upper portion 30 and protruding downward.

Here, in the preform 26, the bottom wall 12 is clamped between the pad member 32 and the lower mold 28 inserted therein, and the upper and lower ends of the cylindrical wall 4 are respectively pressed by the upper mold 30. And lower mold
The flange forming grooves 34, 36 of 28 are set in the rolling apparatus in a state of being projected. Then, after the preform 26 is set in the rolling processing device, the preform 26 is rotated around the center line of the preform 26 by the rotation of the rolling processing device to the upper and lower end portions of the tubular wall 4 of the preform 26. While the pair of bending rollers 38, 40 are pressed against each other, the upper die 30 is lowered, and as shown in FIG. 3, the contact portions of the bending rollers 38, 40 are recessed in an annular shape, The annular recesses 42 and 44 are formed and the cylindrical wall 4 thereof is formed.
The flange portions 24 and 16 are respectively formed at the upper and lower ends of the.

In addition, here, as the bending thrusters 38 and 40, those which are sufficiently thin as compared with the separation distance between the bending rollers 38 and 40 are adopted, and as shown in FIG. A cylindrical portion 46 having a predetermined length is provided between the recessed portions 42, 44 recessed by the abutment of the rollers 38, 40.
Remains undeformed. That is, the bending roller
Since the abutting portions of 38 and 40 are formed into annular recessed portions 42 and 44, and a bent product 48 having a structure in which a cylindrical portion 46 having a predetermined length is left between the recessed portions 42 and 44 is formed. is there.

Here, the portion between the recessed portions 42, 44 of the cylindrical wall 4 of the bent product 48 is left as the cylindrical portion 46, in the thickness increasing step described later, the separation band 14, of the target multi-stage multi-groove V pulley 2, Two ridges 58, 60 as raised portions of the cylinder wall 4 at the formation site of 22.
When the cylindrical wall portion between the recessed portions 42 and 44 is simply a bent convex portion that is curved outward in the radial direction and protrudes, those convex stripes are formed in the thickness increasing step described later. Part 5
This is because 8,60 cannot be formed well.

In the bending step, the condition for leaving the cylindrical strip 46 of a predetermined length in the bent product 48 is not only the ratio between the distance between the bending rollers 38, 40 and the thickness of the bending rollers 38, 40, but also the bending. Although it cannot be generally stated because it depends on the conditions such as the edge shapes of the rollers 38 and 40, the mechanical properties of the cylindrical wall 4 of the preform 26, and the pressing force applied to the bending rollers 38 and 40 at the time of molding a bent product, it is not possible to say unconditionally. If the thickness of the bending rollers 38, 40 is too thick compared to the distance between the rollers 38, 40, the concave portions 42, 44 of the bending product 48
Since the cylindrical wall portion between them becomes a bending convex portion that is simply curved and protrudes outward in the radial direction, as described above, the bending roller 3
It is necessary that the thickness of 8,40 is sufficiently thin compared to the distance between the rollers 38,40. Incidentally, the bending rollers 38 and 40 each having a thickness of 12 mm are brought into contact with the cylindrical wall 4 of the preform 26 in a state of being separated from each other by 44 mm, and the bending rollers 38 and 40 are separated from each other by 44 mm.
When the bent product 48 is formed by pressing the cylindrical wall 4 of the preform 26 with 38 to 40 by a pressing force of 22 tons, the portion between the recessed portions 42 and 44 of the cylindrical wall 4 of the bent product 48 is the third portion. It is recognized that it remains as a cylindrical portion 46 of a predetermined length, as shown.

Further, in FIGS. 2 and 3, reference numeral 50 is a return spring for returning the bending rollers 38, 40 which are brought close to each other in the bending step to the original position.

When the bent product 48 is obtained by such bending operation, then, as shown in FIG. 4, under the rotational operation around the center line of the bent product 48, with respect to the cylindrical wall 4 of the bent product 48,
A thickening roller 56 having two recessed grooves 52 and 54 extending in the circumferential direction is pressed against a portion of the bent product 48 corresponding to the cylindrical portion 46. Then, by this, the flange portions 16, 24 of the bent product 48
The tubular wall portion between them is flattened and made thicker, and as described above, the tubular wall portion corresponding to the concave grooves 52, 54 of the thickening roller 56 is well formed in the concave grooves 52, 54. It is extruded and raised, and ridges 58, 60 having a cross-sectional shape corresponding to the grooves 52, 54 are circumferentially formed on the outer peripheral surface of the cylindrical wall 4.

Here, the concave grooves 52 and 54 of the thickness increasing roller 56 are respectively provided at the portions corresponding to the target separation bands 22 and 14 of the multi-stage multi-groove V pulley 2, and thus are obtained in the thickness increasing step. The ridges 58 and 60 of the thickened product 62 thus formed are also formed at the portions corresponding to the formation portions of the separation bands 22 and 14 of the target multistage multigroove V pulley 2.

In addition, here, the respective ridges on the inner peripheral surface of the cylinder wall of the thickened product 62
The inner peripheral surface of the cylinder wall at the central portion in the axial direction of 58, 60 is
As shown in FIG. 4, respectively, the cylindrical wall 4 is bent outward in the radial direction, and the overlapping portions 64 are formed so as to be in close contact with each other in the axial direction.

When the forming operation of the thickness-increased product 62 as described above is completed, then, as shown in FIG. Groove driving roller having an outer cross-sectional shape that complements the cross-sectional shape of the outer peripheral surface of the cylindrical wall 4 of the target multi-stage multi-groove V pulley 2 under the rotating operation
66 is pressed. Then, by this, the multi-stage multi-groove V-pulley 2 having the target structure is formed.

More specifically, on the outer peripheral surface of the groove cutting roller 66, a cross section corresponding to the target separation bands 22 and 14 is located at a portion corresponding to the ridges 58 and 60 of the thickened product 62. Shaped groove 6
8 and 70 are formed, and V-groove forming ribs 72 of 5 and 4 are formed at the outer sides of the concave grooves 68 and 70 in the axial direction, respectively. Groove
A smooth cylindrical surface 74 is formed at a portion between 68 and 70. Then, here, by pressing such a groove cutting roller 66 against the cylindrical wall 4 of the thickened product 62, the desired cross-sectional shape of the ridges 58, 60 of the thickened product 62 is obtained. The separation bands 22 and 14 are formed, and the separation grooves 22 and 14 are located at the outer side portions in the axial direction of the separation bands 22 and 14, respectively, and have 5 and 4 V grooves 20 and 4 and 3 lines, respectively. V ribs 18 are formed to form the two multi-groove V pulley portions 10 and 8, and the two separation bands 22 and 14 that define the boundaries of the multi-groove V pulley portions 10 and 8 are formed. The non-V groove forming band 6 having a flat outer peripheral surface is formed at a position between them.

As described above, according to the method of the present embodiment related to the first method of the present invention, the two multi-groove V pulley portions 8 and 10 are formed by separating the non-V groove forming bands 6 having a predetermined width. The multi-stage multi-groove V-pulley 2 having the above structure can be favorably manufactured by rolling the bottomed cylindrical preform 26 obtained from a predetermined metal plate material. The multi-stage multi-groove V-pulley 2 manufactured in this manner is obtained by rolling the preform 26 having a bottomed cylindrical shape. Compared with the case where the groove V pulley is manufactured by cutting, the material yield and the productivity can be significantly improved, and the product weight can be significantly reduced.

In the method of the above embodiment, in order to adjust the separation distance between the multi-groove V pulley portions 8 and 10 by changing the width of the non-V groove forming band 6, in the thickening step, the cylindrical wall of the bent product 48 is used. The distance between the concave grooves 52, 54 of the thickness increasing roller 56 pressed against the thickness 4 may be adjusted so as to adjust the distance between the ridges 58, 60 formed on the thickness increasing product 62.

Further, in the above-described embodiment, an example of manufacturing the multi-stage multi-groove V pulley 2 including only the two multi-groove V pulley portions 8 and 10 has been described, but in the above-described embodiment, the number of concave grooves formed in the thickening roller 56 is formed. To increase the number of ridges formed on the thickened product 62, and press a groove cutting roller having concave grooves corresponding to the number of ridges formed on the thickened product. It is also possible to form three or more multi-groove V pulley portions which are separated from each other by the non-V groove forming band 6 on the outer peripheral surface of the cylinder wall.

The multi-stage multi-groove V pulley 2 can also be manufactured by the following method according to the second method of the present invention. In the method described below, only the bending step and the thickness increasing step are different from those of the above-described examples, and therefore only the bending step and the thickness increasing step will be described below in detail. In addition, here, the same components as those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, and detailed description thereof will be omitted.

That is, in the method of this embodiment, the preform 26 formed in the same manner as the method of the embodiment is set in the rolling device in the same manner as the method of the embodiment, but the preform In the bending process after the setting of the 26 rolling device, as shown in FIG.
The three bending rollers 76, 78, 80 are pressed against the cylindrical wall 4 of the preform 26 at a predetermined distance from each other. And, as a result, as shown in the figure,
The contact portions of the bending rollers 76, 78, 80 are recessed to form annular recesses 82, 84, 86 in the circumferential direction on the cylindrical wall 4, while the contact of the bending rollers 76, 78, 80 is made. Cylindrical wall portions between the contact portions are projected in a curved state, and circumferential annular bent convex portions 88, 90 are formed between the concave portions 82, 84, 86.

As is apparent from FIG. 6, at this stage, at both ends of the bent product 92 in which the concave portions 82, 84, 86 and the bent convex portions 88, 90 are formed, the flange portions similar to those in the above-described embodiment are formed. 16,24
Is formed.

When the bent product 92 is formed by such a bending step, then as shown in FIG. 7, the bending product 92 is rotated with respect to the cylindrical wall 4 of the bent product 92 about the center line thereof. In addition, the thickening roller 56 having the two recessed grooves 52 and 54 similar to those in the above-described embodiment at portions corresponding to the bent convex portions 88 and 90 of the bent product 92.
Is pressed. As a result, a thickened product 62 having the same structure as the method of the above-described embodiment is molded. Even in this case, the cylindrical wall 4 is satisfactorily pushed out into the concave grooves 52, 54 of the thickness increasing roller 56 and is raised, so that the concave grooves 52, 54 of the thickness increasing roller 56 are attached to the cylindrical wall portion of the thickness increasing product 62. Ridge 5 having a cross-sectional shape similar to
8 and 60 can be formed well.

Therefore, if the thickened product 62 thus obtained is subjected to grooving processing using the grooving roller 66 similar to that of the above-described embodiment, a structure similar to that manufactured according to the method of the above-described embodiment is obtained. That is, the multi-stage multi-groove V pulley 2 is obtained.

As described above, also according to the procedure according to the second method of the present invention, the multi-stage multi-structure having the structure in which the two multi-groove V pulley portions 8 and 10 are formed by separating the non-V groove forming bands 6 having a predetermined width from each other The groove V-pulley 2 can be satisfactorily manufactured by rolling the bottomed cylindrical preform 26 obtained from a predetermined metal plate material.

Incidentally, in the method of this embodiment, each concave groove 52, 54 of the thickening roller 56
Are provided in correspondence with the bent convex portions 88, 90 of the bent product 92, respectively, and the respective convex stripes are provided on the cylindrical wall portion of the thickened product 62 corresponding to the bent convex portions 88, 90 of the bent product 92. 58 and 60 are formed, for example, as shown in FIG. 8, the multi-groove V pulley portion 8 has three V grooves 20 while the multi-groove V pulley portion 10 has In the case of manufacturing a multi-stage multi-groove V-pulley 94 according to the present invention having seven V-grooves 20, as shown in FIG.
Both 52 and 54 are formed corresponding to the bent convex portion 90 of the bent product 92, and two convex ridges are formed on the cylindrical wall portion of the thickened product 62 corresponding to the bent convex portion 90 of the bent product 92. It is also possible to form 58 and 60, and conversely, when the number of V grooves formed in the multi-groove V pulley portion 8 is significantly larger than that in the multi-groove V pulley portion 10, Two concave grooves 52, 54 of the thickening roller 56 are formed corresponding to the bent convex portions 88 of the bent product 92, and the bent product 92 is formed.
For the cylinder wall portion of the increased-thickness product 62 corresponding to the bent convex portion 88 of
It is also possible to form the two ridges 58, 60.

Further, as described above, the two recessed grooves 52, 54 of the thickening roller 56 are provided corresponding to the common bending convex portion of the bent product, and the thickening product 62 corresponding to the common bending convex portion of the bent product 62. In the case of forming the two convex portions 58, 60 in the tubular wall portion of, as in the above-mentioned embodiment, both the tubular wall portion between the concave portions 82, 84, 86 of the bent product are not necessarily the bent convex portion. As shown in FIG. 10, the concave portions 82, 84 where the convex portions 58, 60 are to be formed based on the adjustment of the edge shape of the bending rollers 76, 78, 80, etc., as shown in FIG. , 86
A bent product 98 is formed by forming only one tubular part (here, the tubular part between the recessed portions 84 and 86) between the bent convex parts 96, and the bent wall 98 of the bent product 98 is As shown in FIG. 11, two concave grooves are formed corresponding to the bent convex portions 96 of the bent product 98.
It is also possible to press the thickening roller 56 provided with 52, 54 to form the thickened product 62. Even in this case, it is possible to mold the thickened product 62 having the same structure as the thickened product 62 molded according to the method of the above embodiment.

Further, also in the method as in the present embodiment, the number of bending rollers used in the bending step is increased to increase the number of bent convex portions of the bent product 92, and thus the number of convex streaks of the thickened product 62. By pressing a groove cutting roller having concave grooves corresponding to the number of the formed convex portions against the thickened product, the non-V groove forming bands 6 are provided on the outer peripheral surface of the cylinder wall. It is also possible to form three or more multi-groove V pulley portions.

Although some embodiments of the present invention have been described in detail above, these are literal examples, and the present invention is not construed as being limited to these specific examples, and does not depart from the scope of the invention. It goes without saying that the present invention can be carried out in a mode in which various changes, modifications, improvements, etc. have been made.

(Effects of the Invention) As is apparent from the above description, in the multi-stage multi-groove V pulley according to the present invention, the separation band that defines the boundary portion is provided independently for each multi-groove V pulley unit, and the separation bands are provided between the separation bands. Since the multi-groove V pulley portions adjacent to each other are provided by separating the non-V-groove forming band provided in the multi-groove V belt from the conventional multi-stage multi-groove V pulley manufactured by the rolling method. The separation distance between the V pulleys can be set to be sufficiently large, and
With the first and second methods according to the present invention, it is possible to satisfactorily manufacture by the rolling method. And hence
It is possible to manufacture a bottomed cylindrical multi-stage multi-groove V pulley having a large separation distance between the multi-groove V pulley parts, with a good material yield and good productivity, and a multi-stage multi-groove having such a structure. The product weight of the V-pulley can be reduced.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an example of a multi-stage multi-groove V pulley according to the present invention. 2 to 5 are explanatory cross-sectional views for explaining the manufacturing process in the case of manufacturing the multi-stage multi-groove V pulley shown in FIG. 1 according to the embodiment of the present invention. FIG. 6 and FIG. 7 are explanatory cross-sectional views for explaining a manufacturing process in the case of manufacturing the multi-stage multi-groove V pulley shown in FIG. 1 according to another embodiment method of the present invention. FIG. 8 is a cross-sectional view of an essential part showing another example of the multi-stage multi-groove V pulley according to the present invention, and FIG. 9 is a method for manufacturing the multi-stage multi-groove V pulley of FIG. 8 according to an embodiment method according to the present invention. FIG. 10 is an explanatory cross-sectional view for explaining a manufacturing process in the case of manufacturing the multi-stage multi-groove V pulley shown in FIG. 8 according to another embodiment of the present invention. FIG. 6 is an explanatory cross-sectional view for explaining the manufacturing process of. 2,94: Multi-stage multi-groove V pulley, 4: Cylindrical wall 6: Non-V groove forming band 8,10: Multi-groove V pulley part 14, 22: Separation band 16, 24: Flange part, 18: V rib 20: V Groove, 26: Preform 28: Lower mold, 30: Upper mold 32: Pad member 38, 40, 76, 78, 80: Bending roller 42, 44, 82, 84, 86: Recessed portion 46: Cylindrical portion 48, 92,98: Bent product 52,54: Groove (for thickening roller) 56: Thickening roller, 58,60: Convex section 62: Thickening product, 66: Grooving roller 68,70: Groove (groove) Cutting roller) 88, 90, 96: Bending projection

Claims (3)

[Claims] 1. A structure in which a plurality of multi-groove V-pulley portions having a structure in which a plurality of V-grooves extending in the circumferential direction are formed in the axial direction are formed on the outer surface of the cylinder wall, with a boundary portion defined by a separation band. Is a bottomed cylindrical multi-stage multi-groove V pulley formed by rolling a bottomed cylindrical preform obtained from a predetermined metal plate material, and defining a boundary of the multi-groove V pulley portion. Separation strips for each groove V
Multi-grooves which are formed independently of each other in the pulley section, and non-V-groove forming zones of a predetermined width are formed between the separation zones of the multi-groove V pulley sections which are adjacent in the axial direction, and the multi-grooves which are adjacent in the axial direction are formed. A multi-stage multi-groove V-pulley, characterized in that the V-pulley portion is provided so as to be separated from the non-V-groove forming band. 2. A multi-groove V-pulley section having a structure in which a plurality of V-grooves extending in the circumferential direction are formed in the axial direction is provided on the outer peripheral surface of the cylinder wall between separation bands that define the boundary of the V-pulley section. A method for manufacturing a bottomed cylindrical multi-stage multi-groove V-pulley, which is formed by forming a plurality of non-V-grooves having a predetermined width, and is obtained from a predetermined metal plate material. By pressing the two bending rollers against the cylindrical wall of the bottomed cylindrical preform, the abutting portion of the bending rollers is a recessed portion that is recessed radially inward. A bending step of forming a bent product having a structure in which the tubular wall portion between the recessed portions is left in a cylindrical shape with a predetermined length, and a tube of the bent product with respect to the tubular wall of the bent product obtained in the bending step. It is located in the part corresponding to the cylindrical part between the recessed parts of the wall, and the circumferential direction By pressing a thickening roller having a structure in which a plurality of recessed grooves are provided at a predetermined distance from each other in the axial direction, and press-molding the cylindrical wall of the roller, the recessed grooves of the thickening roller are formed. A thickness increasing step of forming a thickness increasing product having a structure in which a ridge portion extending in the circumferential direction is formed at a corresponding portion, and the thickness increasing process is performed on the cylinder wall of the thickness increasing product obtained in the thickness increasing step. A groove extending in the circumferential direction is provided at a portion of the meat product corresponding to each of the convex streak portions, and corresponds to each forming portion of the multi-groove V pulley portion defined by the convex streak portions. The grooved rollers each having a structure in which a plurality of V ribs are provided are pressed against each other to form the separation band on each convex portion of the thickened product, and the groove is defined by the convex stripe portion. The plurality of V-grooves are respectively formed in the formation portions of the multi-groove V-pulley portions, and the cylinders are formed. Wherein the plurality of the grooving step allowed to form a multi-grooved V pulley, multistage Tamizo V pulley manufacturing method which comprises a. 3. A multi-groove V-pulley portion having a structure in which a plurality of V-grooves extending in the circumferential direction are formed in the axial direction is provided on the outer peripheral surface of the cylinder wall between separation bands that define the boundary of the V-pulley portion. A method for manufacturing a bottomed cylindrical multi-stage multi-groove V-pulley, which is formed by forming a plurality of non-V-grooves having a predetermined width, and is obtained from a predetermined metal plate material. By pressing three or more bending rollers against the cylindrical wall of the bottomed cylindrical preform and recessing the abutting portions of the bending rollers inward in the radial direction, the cylindrical wall is formed in the radial direction. A bending step of forming a bent product having uneven concavities and convexities, and a cylindrical wall of the bent product obtained in the bending step, which is located at a portion corresponding to a bending convex portion of the cylindrical wall of the bent product. Grooves that extend in the same direction are separated from each other by a predetermined distance in the axial direction. A plurality of thickening rollers having a structure are pressed against each other, and the cylindrical wall of the thickening roller is thickened to form a ridge portion extending in the circumferential direction at a portion corresponding to each of the concave grooves of the thickening roller. The thickening step of forming a thickened product having a different structure, and the cylinder wall of the thickened product obtained in the thickening step is located at a portion corresponding to each of the ridges of the thickened product. A structure in which concave grooves extending in the circumferential direction are provided, and a plurality of V ribs are provided at portions corresponding to respective formation portions of the multi-groove V pulley portion defined by the convex stripes The groove cutting roller is pressed to form the separation band on each convex portion of the thickened product, and the plurality of V grooves are formed on the formation portion of each multi-groove V pulley portion defined by the convex stripe portion. A grooving step of forming each of them and forming the plurality of multi-groove V-pulley portions on the cylinder wall; Multistage Tamizo V pulley manufacturing method, which comprises,.