JPH047393Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pulley made of sheet metal, and more specifically, the pulley part is formed by slotting the outer peripheral surface of a disc-shaped material and is installed in the center. The present invention relates to an idler pulley in which a bearing member such as a bearing is attached to a bearing part.

[Prior art] In general, idler pulleys are
No. 41487, JP-A-55-17757 and JP-A-55-
It is known from the publication No. 47047. This type of idler pulley is completed by pressing a single disc made of steel plate, etc., and then going through multiple roller forming steps.As shown in Figure 1, there is a cylinder in the center of the idler pulley. A web 5 having a dogleg-shaped cross section is formed in the radial direction from one end of the bearing part 7, and a V-shaped cross-section is formed by folding back from the end of the web 5. A pulley part 3 consisting of a circumferential groove is formed, and a bearing member 11 (bearing) is fitted into the bearing part 7, and the bearing member 11 is fixed at one of both axial ends of the bearing part 7 in the roller forming process stage. form the bottom on the side,
A stopper 8 is formed by drilling a through hole in the bottom of the stopper 8. After fitting the bearing member 11 to the bearing part 7, the peripheral edge 9 of the web 5 is bent to serve as a receiving surface for the stopper 8. When the bearing member 11
The stopper 8 and the peripheral edge 9 receive an external force P on both sides in the axial direction.

[Problems to be solved by the invention] However, since such a conventional pulley 1 requires many bending processes, there is a limit to the thickness of the steel plate used as the material. Since it is molded, cracks are likely to occur especially in the folded portion. Furthermore, since the web 5 connecting the pulley part 3 and the bearing part 7 is formed in a single-sided state on one side of the pulley part 3, uneven rotation is likely to occur during rotational operation, resulting in poor high-speed rotation performance and durability. There was a missing part.

Further, as is well known, the bearing member 11 holds balls between an inner ring and an outer ring, and has a structure in which the gaps between the inner ring and the balls and between the outer ring and the balls are very narrow. Therefore, when the bearing member 11 receives an external force P when the stopper 8 and the peripheral edge 9 of the web are brought into pressure contact as described above, the inner ring and the outer ring are easily deformed, and the gap between them changes. In other words, the bearing member 11 is easily deformed by external force.
Since an external force must be applied to the bearing member 11, the bearing member 11 will be deformed to some extent. As a result, the rotational torque of the pulley becomes heavy,
Or, there was a drawback that it could not rotate.

Therefore, in view of the above-mentioned circumstances, this invention was made for the purpose of providing a high-quality idler pulley that can prevent uneven rotation and withstand high-speed rotation.

[Means for Solving the Problems] In order to solve the above problems, this invention aims to solve the above problems by forming a circular sheet metal into a dish-shaped material having a recess in the center and a flange around the outer periphery of the recess by press working. and the bottom of the recess is pressed in the opening direction by press working to form a bottomed cylindrical shape, and the flange is located approximately in the center of the bottomed cylindrical shape to form a web. A pulley part is formed with a slot on the outer peripheral edge of the flange part, a through hole is bored in the bottom of the bottomed cylinder to form a bearing part, and a bearing member is fitted into the bearing part, and The idler pulley is configured such that the web is pressed so that the inner circumferential edge of the bearing portion faces the bottom portion and protrudes toward the center, thereby providing a stopper for fixing the bearing member.

[Function] According to this invention having the above structure, the pulley part has a slit-shaped flange, and the flange is located approximately at the center of the bearing part, so the pulley part is not cantilevered and therefore does not rotate. Since no unevenness occurs, high-speed rotation performance and durability are improved.

[Example] Next, an example of this invention will be described based on the drawings.

As shown in FIG. 2, the idler pulley 10 of this invention is formed from a circular sheet metal through the processing steps described below, and a bearing member 11 (bearing) is fitted and fixed in the center. A cylindrical bearing part 12 and a bearing part 12 for fixing the bearing member 11.
stoppers 13 and 14 formed by bending both ends of the bearing part 12 toward the center; and an offset part formed by bending one end of the bearing part 12 and slanting toward the substantially central part of the bearing part 12 and extending in the radial direction. 15 and a flat portion 16, and a pulley portion 18 having a V-shaped cross section formed at the outer peripheral edge of the web 17.

The idler pulley 10 is molded through the steps shown in FIG. That is, by drawing the central part of the circular sheet metal 20 shown in FIG. 3a using a press or the like, a concave portion 21 and a flange portion 22 as shown in FIG. 3b are formed.
A plate-shaped material 23 is formed. Next, as shown in FIG. 3c, the recess 21 of the material 23 is
Push the bottom part inward by drawing process, and remove the flange part 2.
2 forms a bottomed cylindrical bearing portion 12 that is located approximately at the center in the axial direction and forms a web 17. Tsuba 2
2 is formed by forming a portion that is inclined from one end of the bearing portion 12 to form the offset portion 15, and a portion that continues flatly in the radial direction to form the flat portion 16. A through hole 25 having a stopper 13 is punched out in the center at the bottom of the bearing portion 12. The thus formed semi-finished product 26 is shown in FIG.
As shown in FIG. 2, the pulley portion 18 having a V-shaped cross section is formed by being held between rotatable receiving molds 27 and 28 and pressing the outer peripheral edge of the collar portion 22 with a slotted roller 29 while rotating. Then, as shown in FIG. 3e, the bearing member 11 is fitted into the bearing part 12, one end thereof is brought into contact with the stopper 13, and the other end is caulked around the peripheral edge of the bearing part 12. Then, the bearing member 11 is brought into contact with the stopper 14 to be formed.
This is to fix the That is, forming rollers are applied to both sides of the web 17, and one side is placed on the bearing part 1.
2 (arrow P in Figure 2).
), the flesh of the web 17 is moved toward the bearing portion 17 (see arrow R in FIG. 2), thereby causing the peripheral edge of the bearing portion 12 to protrude toward the bearing member 11 (spin caulking). be.

When the idler pulley 19 shown in FIG. 4 is processed through the processing steps shown in FIGS. 3 a to 3 c and then shown in FIG. is pressed and rotated to roughly form a V groove, and then a multi-groove forming roller, which replaces the slit roller, is rotated and pressed onto the V-groove, thereby forming a multi-strip V-groove pulley portion 30 with a substantially W-shaped cross section.
was formed. The rest of the configuration is the same as in the previous embodiment, so redundant explanation will be omitted. Note that the processing step is performed on the idler pulley 10,
This is an example for molding the molding material 19, and other methods may be used.

According to the idler pulley having the above configuration, since the web 17 is located at the center of the bearing part 12,
Since the center of the bearing member 11 coincides with the center of the pulley parts 18 and 30 and no uneven load is applied to the bearing member 11, the durability of the bearing member 11 is improved. Further, since the offset portion 15 is disposed obliquely from one end of the bearing portion 12 toward the center, it has spring properties, and the pulley portion 18,
When an excessive load is applied to the bearing member 11
It has a cushioning effect on.

[Effects of the invention] According to the invention described above, a circular sheet metal is formed into a plate-shaped material having a recess in the center and a flange around the outer periphery of the recess by press working, and the recess The bottom of the cylinder is pressed in the direction of the opening by press working to form a cylinder with a bottom, and the flange is located approximately in the center of the cylinder with a bottom to form a web. A pulley part is formed with slots, a through hole is bored in the bottom of the bottomed cylinder to form a bearing part, a bearing member is fitted into the bearing part, and the web is pressed. Since the idler pulley is provided with a stopper for fixing the bearing member so that the inner peripheral edge of the bearing part faces the bottom part and protrudes toward the center, the pulley part does not become cantilevered, which is advantageous in terms of strength. Therefore, when the belt is wrapped around the pulley, the load is evenly distributed without causing uneven load on the bearing member, preventing uneven rotation, resulting in high rotation efficiency and high speed. In addition to sufficiently withstanding rotation, it also improves the service life of bearing members. Furthermore, since it is molded from a single circular sheet metal, an idler pulley with a relatively small diameter can be obtained.

Furthermore, the bearing member is fitted and fixed by being held between the bottom of the bearing and a stopper that presses the web so that the peripheral edge of the bearing faces the bottom and protrudes toward the center. When forming, only a slight external force is applied to the axial end of the outer ring, and no compressive force is applied to the outer ring of the bearing member as in the conventional case. Therefore, there are effects such as no inconvenience that would hinder the rotation of the pulley.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional idler pulley, Figure 2 is a cross-sectional view of a conventional idler pulley.
The figure is a sectional view showing an embodiment of this invention, Figure 3a
-e are explanatory diagrams of the forming process of the idler pulley according to this invention, and FIG. 4 is a sectional view showing another embodiment of this invention. 10... Idler pulley, 11... Bearing member,
12... Bearing part, 13, 14... Stopper, 1
5...offset part, 16...flat part, 17...
Web, 18...Pulley part, 20...Circular sheet metal,
21... recess, 22... flange, 25... through hole, 2
7, 28... Receiving mold, 29... Slit roller,
30...Multi-row V-groove pulley part.

Claims (1)

[Scope of utility model registration request] A circular sheet metal is press-worked into a dish-shaped material having a recess in the center and a flange around the outer periphery of the recess, and the bottom of the recess is pressed in the direction of the opening. A cylindrical shape with a bottom is formed, and the flange portion is positioned approximately in the center of the cylindrical shape with a bottom to form a web, and a pulley portion is formed with a slot on the outer peripheral edge of the flange portion. A through hole is bored in the bottom of the shape to form a bearing part, a bearing member is fitted into the bearing part, and the web is pressed so that the inner peripheral edge of the bearing part faces the bottom part and the center of the bearing part is formed. An idler pulley comprising a stopper that protrudes in the direction and fixes the bearing member.