JPH0728258U - Sheet metal pulley - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to prevent the deformation, breakage or breakage with time by reducing the load applied to the boss mounting part, especially at the boundary part, and to maintain a large friction force to achieve a predetermined transmission efficiency. (EN) The problem of uneven wear due to one-sided contact of the belt can be effectively solved. [Structure] A central flat portion 11A of an axial intersecting wall portion 11 integrally formed with a peripheral wall portion 12 forming a belt winding portion 14.
And the outer peripheral flat portion 11B formed on the side of the peripheral wall portion 12 are smoothly connected via the two bent portions 11c and 11d and the continuous portion 11E, and are fitted into the through hole 15 at the center of the central flat portion 11A. A mating surface 11 of a mounting flange portion 21 and a central flat portion 11A which are formed to project radially outward of the existing boss 20.
a is set on a straight line L that passes through the center of the belt winding portion 14 in the width direction or near the center of the width direction and is orthogonal to the axis of the boss 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a circular cup shape in which an axial intersecting wall portion and a peripheral wall portion are integrally formed by processing a sheet metal plate material, and a belt wrapping that is rotated together with the belt on the outer periphery of the peripheral wall portion by frictional force with the belt. The present invention relates to a sheet metal pulley in which a portion is formed.

[0002]

[Prior art]

 As a conventional sheet metal pulley of this type, for example, as shown in FIG. 3, a circular cup shape in which an axis intersecting wall portion 55 and a peripheral wall portion 51 are integrally formed by processing a metal plate material is used. A belt winding portion 54 that is rotated together with the belt by frictional force with the belt is formed on the outer periphery, and a through hole 56 is formed in the center of the axis intersecting wall portion 55 that is uniformly flat. A boss 57 for inserting a rotary shaft (not shown) is fitted into the through hole 56, and a mounting flange 57A formed on the boss 57 and extending outward in the radial direction has a flat inner surface of the axial line intersecting wall 55. Although not shown, it is known that it is fixed to the outer surface by a joining means such as brazing or welding, or by bolting.

Further, as shown in FIG. 4, a sheet metal member formed by bulging a central flat portion 55a of the axial intersecting wall portion 55 in a convex cross section in the pulley axial direction from an outer peripheral flat portion 51b on the peripheral wall portion 51 side. Pulleys are also known.

[0004]

[Problems to be solved by the device]

 Among the above-mentioned conventional sheet metal pulleys, in the case of the sheet metal pulley shown in FIG. 3, the tension force generated on the tension side of the belt during its rotation is evenly attached to the boss 57 via the flat intersecting wall portion 55. A large eccentric load is repeatedly applied to the fixed portion of the collar portion 57A by being transmitted to the fixed portion. That is, since the line of action of the tensile force F of the belt passing through the widthwise center of the belt winding portion 54 is deviated from the neutral plane C of the axis intersecting wall portion 55 by the distance r, the boss in the axis intersecting wall portion 55 is formed. Moment (F × r) acts on the XX cross-section of the boundary between the portion of 57 that is in contact with mounting collar 57A and the portion that protrudes from mounting collar 57A, and this moment causes X A load that causes a large bending stress and a shearing stress is repeatedly applied to the −X cross section, and as a result, the XX cross section may be damaged, which may lead to destruction.

Further, in the conventional sheet metal pulley shown in FIG. 3, when the belt is wound around the belt winding portion 54 and the sheet metal pulley is rotated by the frictional force between the belt winding portion 54, the axial line intersecting wall portion 55 and the boss 57. The peripheral wall portion 51 is apt to be largely deformed obliquely around the attachment portion with the attachment flange portion 57A, and as a result, the belt cannot obtain uniform friction with the belt winding portion 54, so that the transmission efficiency is reduced. In addition, there is a problem that the belt partially contacts the belt wrapping portion 54 and the belt is unevenly worn.

Further, in the conventional sheet metal product shown in FIG. 4, the axial line intersecting wall portion 55 is formed in a convex cross section, and it is formed between the central flat portion 55a and the outer peripheral flat portion 51b on the side of the peripheral wall portion 51. Since the two bent portions 51c and 51d are formed, the flexibility of the bent portions 51c and 51 can absorb the tensile force F of the belt, but from the line of action of the tensile force F 1. Since the distance r to the central flat portion 55a is longer than that in FIG. 3, the moment (F × r) acting on the XX section is large, and bending stress and shear stress are generated on the XX section. The load is almost the same as in the case of Fig. 3, and there is no possibility of eliminating the possibility that the XX section will be damaged over time and eventually lead to destruction. In the case of the sheet metal pulley shown in Fig. 4, Is the same as the sheet metal pulley in Fig. 3. To have the problem of uneven wear of reduction and belt transmission efficiency.

The present invention has been made in view of the above circumstances, and reduces the load applied to the boss mounting portion, particularly the boundary portion, to prevent deformation, damage or destruction over time, and A sheet metal that can ensure a normal rotation transmission function over a long period of time, can retain a large frictional force to ensure a predetermined transmission efficiency, and can effectively eliminate the problem of uneven wear due to uneven contact of the belt. The purpose is to provide a pulley made of.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the sheet metal pulley according to the present invention has a circular cup shape in which an axial intersecting wall portion and a peripheral wall portion are integrally formed by processing a metal plate material, and a belt is formed on the outer periphery of the peripheral wall portion. A belt winding portion that is rotated together with the belt by frictional force is formed, and a central flat portion in which the axial line intersecting wall portion is formed in the center and an outer peripheral flat portion formed in the peripheral wall portion side are provided. A boss that is smoothly connected through two bent parts and a continuous part, and that inserts a rotary shaft is inserted into a through hole formed in the center of the central flat part. A sheet metal pulley in which a mounting flange portion that is formed to extend radially outward is mounted on a central flat portion of the axis intersecting wall portion, and a mating surface between the central flat portion and the mounting collar portion of the boss is the belt. Center of width of wrapping part or Through the near direction center, and those which are set on a straight line perpendicular to the axis of the boss.

In the sheet metal pulley having the above structure, it is preferable that ears that project outward in the radial direction are integrally formed at both ends in the width direction of the peripheral wall portion.

Further, in the sheet metal pulley having the above structure, it is preferable that both end surfaces of the boss in the axial direction are housed within the width of the peripheral wall portion.

[0011]

[Action]

 According to the sheet metal pulley of the present invention configured as described above, the central flat portion of the axis intersecting wall portion and the mounting collar portion of the boss are aligned at a position on or near the line of operation of the tensile force of the belt. Because of the existence of the surface, the distance between the neutral surface of the central flat portion and the line of action of the tensile force becomes extremely small, and the boundary cross section between the portion abutting the mounting collar portion and the mounting collar portion in the central flat portion. The moment that acts on is very small. Further, since the tensile force is absorbed by the flexibility of the two bent portions formed through the continuous portion between the central flat portion and the outer peripheral flat portion, bending stress and shear stress are applied to the boundary cross section. The load generated is significantly reduced. As a result, it is possible to effectively prevent damage to the boundary cross section, and thus damage, and also to make the peripheral wall part oblique with the center flat part and the mounting flange part of the boss as the center. Deformation is also prevented, and almost uniform frictional force is obtained between the belt and the belt wrapping portion, which ensures a sufficient transmission efficiency at all times and prevents the belt from hitting the belt wrapping part on one side. The accompanying uneven wear of the belt is effectively eliminated.

Further, when the ears that project outward in the radial direction are integrally formed at both ends in the width direction of the peripheral wall portion as in claim 2, not only can the strength of the entire pulley be increased, but also The frictional force between the belt and the belt wrapping area is further increased, and high transmission efficiency can be secured.

Further, when the boss is configured such that both end faces in the axial direction thereof are accommodated within the width of the peripheral wall portion, the local boss is not formed. Therefore, when stacking and storing multiple sheet metal pulleys with their intersecting wall walls back to back, stable stacking is possible, and even when handled as a single unit, the boss accidentally collides with other objects. Therefore, it can be prevented from being deformed or damaged, which is very advantageous in handling.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing a sheet metal pulley according to an embodiment of the present invention. In FIG. 1, the sheet metal pulley 1 is composed of a pulley body 10 and a boss 20. 10 is formed into a circular cup shape by integrally forming an axial intersecting wall portion 11 and a peripheral wall portion 12 by subjecting a thin metal plate material to drawing or rolling, and a flat belt is formed on the outer periphery of the peripheral wall portion 12. A belt winding portion 14 around which (not shown) is wound is formed.

The axis intersecting wall portion 11 includes a central flat portion 11A formed at the center of the axis intersecting wall portion 11 and an outer peripheral wall located outside the central flat portion 11A in the axial direction of the pulley 1. It has an outer peripheral flat portion 11B formed on the side of the portion 12 and these flat portions 11A and 11B are smoothly connected to each other through the two bent portions 11c and 11d and the continuous portion 11E, and are located at the center of the central flat portion 11A. A through hole 15 is formed, and at both ends in the width direction of the peripheral wall portion 12, ears 12A, 12B that project outward in the radial direction are integrally formed.

The boss 20 is fitted into the through hole 15 at the center of the central flat portion 11A, and the mounting flange portion 21 is formed so as to extend horizontally in the radial outward direction of the boss 20, and is attached to the inner surface of the central flat portion 11A. Further, it is firmly fixed by, for example, ring-shaped projection welding or a plurality of bolts (not shown).

The boss 20 is set such that both axial end surfaces 20 a and 20 b are accommodated within the width of the peripheral wall portion 12 by the bending cross connection with the axial line intersecting wall portion 11 as described above. In addition, the inner surface 9 of the central flat portion 11A, that is, the mating surface 11a of the boss 20 with the mounting collar portion 21 passes through the center of the belt winding portion 14 in the width direction and is orthogonal to the axis C1 of the boss 20. It is set on the straight line L.

According to the sheet metal pulley having the above-described configuration, the line of action of the tensile force F by the belt matches the straight line L, and the mating surface 11a is present on the straight line L. The distance r between the neutral line C of the central flat portion 11A of the intersecting wall portion 11 and the line of action of the tensile force F (straight line L) becomes extremely small, and it comes into contact with the mounting flange portion 21 of the boss 20 in the central flat portion 11A. The load that causes bending stress and shearing stress is remarkably reduced in the boundary cross section XX between the bent portion and the portion protruding from the mounting flange portion 21.

Further, the tensile force F is absorbed by the flexibility of the two bent portions 11c and 11d formed between the central flat portion 11A and the outer peripheral flat portion 11B via the continuous portion 11E. Therefore, the load that causes bending stress and shear stress in the boundary cross section XX is further reduced. As a result, it is possible to prevent the boundary cross section X-X from being damaged over time, and eventually, to ensure normal rotation transmission performance for a long period of time.

Further, since the line of action of the tensile force F by the belt matches the straight line L, the peripheral wall receives a force centered on the attachment point between the central flat portion 11A and the attachment flange portion 21 of the boss 20. The part 12 and the belt winding part 14 are also prevented from being deformed obliquely, and a substantially uniform frictional force is obtained between the belt and the belt winding part 14, resulting in a reduction in transmission efficiency and a belt winding part. The uneven wear of the belt due to the uneven contact of the belt with respect to 14 is effectively eliminated. In addition, in this embodiment, since the entire boss 20 is housed within the width of the peripheral wall portion 12, the plurality of pulleys 1 can be stably stacked and stored, and the boss 20 can be replaced with other objects. It is also possible to prevent accidental bumps and deformation or damage.

In the above embodiment, the mounting flange portion 21 of the boss 20 is fixed to the inner surface of the central flat portion 11A, but the mounting flange portion 21 of the boss 20 is fixed to the outer surface of the central flat portion 11A. Even with the attached structure, the same operational effect as that of the above-described embodiment can be obtained.

In addition, in the above-described embodiment, the ears 12A and 12B that project outward in the radial direction are integrally formed at both ends in the width direction of the peripheral wall portion 12, but FIG. As described above, the peripheral wall portion 12 may be formed flat over the entire length in the width direction.

[0023]

[Effect of device]

 As described above, according to the present invention, by providing the mating surface of the central flat portion of the axis intersecting wall portion and the mounting flange portion of the boss on or near the line of action of the tensile force of the belt. , The moment acting on the boundary cross section between the part that is in contact with the mounting flange and the mounting flange in the central flat part by making the distance between the neutral plane of the central flat part and the line of action of the tensile force extremely small. Can be made very small, and the tensile force due to the belt can be absorbed by the flexibility of the two bent portions formed through the continuous portion between the central flat portion and the outer peripheral flat portion. Therefore, it is possible to remarkably reduce the load that causes the bending stress and the shearing stress in the boundary cross section, and effectively prevent the breakage of the boundary cross section and the occurrence of the breakage. Moreover, the peripheral wall is also prevented from being deformed diagonally around the mounting point between the central flat part and the mounting flange of the boss, and almost uniform friction force is obtained between the belt and the belt wrapping part. Therefore, it is possible to always ensure a sufficient transmission efficiency, and it is possible to effectively solve the problem of uneven wear of the belt due to the belt partially hitting the belt winding portion. Therefore, it is possible to maintain the reliable and efficient rotation transmission function for a long period of time.

When the ears that project outward in the radial direction are integrally formed at both ends in the width direction of the peripheral wall portion as in claim 2, not only can the strength of the entire pulley be increased, but also the belt and Higher transmission efficiency can be ensured by further increasing the frictional force with the belt winding portion.

Further, when the boss is configured such that both end surfaces in the axial direction are accommodated within the width of the peripheral wall portion, the local boss is not formed. Therefore, when stacking and storing multiple sheet metal pulleys with their intersecting wall walls back to back, stable stacking is possible, and even when handled as a single unit, the boss accidentally collides with other objects. As a result, it is possible to improve the handleability such that it can be prevented from being deformed or damaged.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a sheet metal pulley according to the present invention.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the present invention.

FIG. 3 is a vertical sectional view showing an example of a conventional sheet metal pulley.

FIG. 4 is a vertical cross-sectional view showing another example of a conventional sheet metal pulley.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet metal pulley 11 Axis intersecting wall part 11A Central flat part 11B Outer peripheral flat part 11a Mating surface 11c, 11d Bent part 11E Continuous part 12 Peripheral wall part 12A, 12B Ear part 14 Belt winding part 15 Through hole 20 Boss 21 Mounting collar Part L straight line

Claims (3)

[Scope of utility model registration request] 1. A belt wrapping, which is a circular cup shape in which an axial line intersecting wall portion and a peripheral wall portion are integrally formed by processing a metal plate material, and is rotated together with the belt on the outer periphery of the peripheral wall portion by a frictional force with the belt. A part is formed, and a central flat part in which the axial line intersecting wall part is formed at the center thereof and an outer peripheral flat part formed on the peripheral wall part side are smoothly formed through two curved parts and a continuous part. A boss for inserting the rotary shaft is inserted into a through hole formed in the center of the central flat portion, and a mounting flange portion that extends outward in the radial direction of the boss has the axial line crossing. A sheet metal pulley attached to a central flat portion of a wall portion, wherein a mating surface between the central flat portion and a mounting flange portion of a boss passes through the widthwise center of the belt winding portion or the vicinity of the widthwise center, And the straight line perpendicular to the axis of the boss A sheet metal pulley characterized by being set on the line. 2. The sheet metal pulley according to claim 1, wherein ears that project outward in the radial direction are integrally formed at both ends in the width direction of the peripheral wall portion. 3. The sheet metal pulley according to claim 1, wherein both end surfaces of the boss in the axial direction are housed within the width of the peripheral wall portion.