JPH04113061A - Poly-v pulley - Google Patents

Abstract

PURPOSE:To sufficiently enhance a reduction in weight and obtain a poly-V pulley excellent in strength by fitting a belt receiving member onto the circumferential wall of a pulley body and inserting a buried member into the pulley body at the time of molding the body. CONSTITUTION:A metal belt receiving member 1 and an embedded member 2 are obtained by forming a plurality of V channels 1a... parallel to each other, or a poly-V channel on the outer circumferential surface of a cup sheet metal member, working the bottom plate of the cup into a desired form, and boring a hole 2a in the center part. A pulley body 3 has a cylindrical form thickened in the peripheral part, a rotating shaft through hole 3a is formed in the center part, a plurality of bolt through holes 3b for connecting the poly-V pulley to the connecting member of a rotating shaft is formed, and a metal ring 4 is fitted thereto. Such a pulley body 3 is molded by charging a resin material in a space part formed in the state where an upper die A and a lower die B are provided on the upper part and lower part of the belt receiving member 1 and the embedded member 2, and at this time, the pulley body 3 is molded with the embedded member 2 being inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a poly V pulley for power transmission, which is used, for example, as a timing belt in a motor vehicle.

[Prior Art] This type of poly V pulley is used for a poly V belt having a plurality of protrusions having a triangular cross section formed on the inner peripheral surface. A plurality of parallel V grooves, that is, poly V grooves, which fit into the protrusions of the poly V belt are formed on its outer peripheral surface.

Such poly-V pulleys are generally manufactured by cutting a material or by casting. However, in recent years, in order to further reduce weight, sheet metal type poly V pulleys as shown in Fig. 6, which are manufactured by the method disclosed in Japanese Patent Publication No. 54-21309, or Poly V pulleys made of synthetic resin as shown in the figure are now being manufactured.

[Problems to be Solved by the Invention] However, in a poly V pulley formed only of sheet metal as shown in FIG. Therefore, there was a problem in that it was not possible to achieve sufficient weight reduction.

In addition, as shown in Fig. 7, poly V made of synthetic resin is used.
For pulleys, if foreign matter such as gravel gets between the poly V groove of the poly V pulley and the ridges of the poly V belt, the peaks and valleys of the poly V groove will be easily damaged, and the service life will be extremely shortened. The problem was that it was short.

The invention was made in view of the above circumstances,
The object of the present invention is to provide a poly-V pulley that can be sufficiently lightened and has excellent strength.

[Means for Solving the Problems] A poly V pulley according to the invention that achieves the above object has a pulley body made of synthetic resin and a cylindrical shape in which a plurality of mutually parallel V grooves extending in the circumferential direction are formed on the outer peripheral surface. A metal belt receiving member, and an embedded part that is integrated with the belt receiving member and is bent from one end of the belt receiving member toward the center of the cylinder, and the belt receiving member is attached to the peripheral wall of the pulley body. It is characterized in that the embedded member is fitted into the pulley body and inserted into the pulley body when the pulley body is molded.

[Function] In the poly V pulley constructed as described above, since the poly V groove is made of metal, even if foreign matter such as gravel gets in between the protrusions of the poly V belt, the peaks and valleys of the poly V groove can be avoided. is not easily damaged. In addition, since the belt receiving member made of metal is fitted onto the peripheral wall of the pulley body made of synthetic resin, the load in the radial direction on the belt receiving member can be received by the pulley body, thus making the belt receiving member thinner. It becomes possible to do so. By inserting the embedded member into the pulley body, the belt receiving member is securely attached to the outer circumferential wall of the pulley body.

[Example] The poly V pulley shown in FIG. 1 includes a cylindrical metal belt receiving member 1, an embedded member 2 integrated with the belt receiving member 1,
and a pulley body 3 made of synthetic resin.

The metal belt receiving member 1 and the embedded member 2 are mounted on the outer circumferential surface l111 of a cup-shaped sheet metal member M as shown in FIG. Multiple ■ extending in the circumferential direction and parallel to each other
It can be obtained by forming the groove 1a, that is, a poly V groove, processing the bottom plate m2 of the cup into a desired shape, and then drilling a hole 2a in the center of the portion corresponding to the bottom plate m2. The thickness of the sheet metal member used is approximately 0.8 m.

However, the belt receiving member 1 and the embedded member 2 do not necessarily have to be formed from the sheet metal member M as described above, and may be formed as a press-formed product or a cast product made of an aluminum alloy. good.

The pulley main body 3 has a disk shape with a thick peripheral edge, and a rotating shaft through hole 3a is formed in the center.

Further, in the pulley body 3, a plurality of bolt through holes 3b are formed at equal intervals around the shaft for connecting the poly-V pulley to a connecting member etc. with the rotating shaft.
A metal ring 4 is fitted to b. As shown in FIG. 3, such a pulley body 3 has an upper mold A and a lower mold B disposed above and below the belt receiving member 1 and the embedded member 2, and these molds A, B and the belt receiver. It can be molded by filling the space formed by the member 1 with a resin material. At this time, as is clear from the above, the pulley main body 3 is insert-molded with the embedded member 2.

In the poly V pulley constructed as described above, the belt receiving member 1 is fitted onto the peripheral wall of the pulley body 2, and the embedded member 2 is inserted into the pulley body 3. The pulley body 2, which occupies most of the volume of this poly-V pulley, is made of synthetic resin, and the belt receiving member 1 made of metal is attached to the outer periphery of the pulley body 2, so that the pulley body 2 can be made thinner. Therefore, the overall weight is much reduced compared to the poly V pulley shown in FIG. 6, which is formed only from sheet metal. In addition, since the Vltla...that is, the poly V groove that comes into contact with the protrusions of the poly V belt is made of metal, the peaks and valleys can be easily damaged even if gravel or the like gets caught between the protrusions and the protrusions. There is no. Furthermore, since the embedded member 2 integrated with the belt receiving member 1 is inserted into the pulley body, the heald receiving member 1 is firmly and immovably attached to the outer peripheral wall of the pulley body 3. The embedded member 2 also contributes to improving the strength of the pulley body 3.

It goes without saying that the poly V pulley according to the invention is not limited to that shown in FIG. 1 above.

The poly V pulley according to the invention shown in FIG. 4 has a belt receiving member 1, which is exactly the same as that shown in FIG. ing. The embedded member 12 is formed to match the shape of the pulley body 13 and to be placed at the center of the pulley body 13 in the thickness direction. The poly V pulley shown in FIG. 4 can be manufactured in exactly the same manner as the poly V pulley shown in FIG. 1 by changing the mold used for molding the pulley body 13.

The poly V pulley shown in FIG. 5 includes a belt receiving member 1, an embedded member 22, a pulley main body 23 made of synthetic resin, and a pulley boss 5 made of metal. The belt receiving member 1 is the first
It is formed in exactly the same shape as the poly V pulley shown in the figure. The embedded member 22 has a larger diameter than the embedded member 2 in the case of FIG. It is located close to the center. The pulley body 23 differs from the pulley body 3 shown in FIG. 1 in that a rib 23c extending in the radial direction is formed on the lower surface thereof, and the pulley boss 4 is fitted into the shaft penetrating portion 23a. The belt receiving member 1 is fitted onto the outer circumferential wall of the pulley body 23 in exactly the same manner as in FIG. 1. Such a poly-V pulley can also be manufactured using substantially the same procedure as the poly-V pulley shown in FIG. That is, when molding the pulley body 23, the pulley boss 5 is disposed in the shaft through hole 23a, and the upper and lower molds are changed to appropriate molds, so that the belt receiving member 1, the pulley boss 5, and the upper and lower molds are formed. It can be manufactured by filling the space with synthetic resin.

The poly V shown in FIGS. 4 and 5 formed as described above
The pulley can also provide the same effects as the poly V pulley shown in FIG.

[Effects of the Invention] According to claim 1, by making the pulley main body made of synthetic resin and making the belt receiving member thin, it is possible to obtain a poly V pulley that is extremely lightweight as a whole. In addition, even though it is lightweight, the peaks and valleys of the poly V groove are not easily damaged, so an economical poly V pulley with a long service life can be obtained. moreover,
Since the belt receiving member is firmly attached to the outer peripheral wall of the pulley body, rotation transmission is reliable and highly reliable.

[Brief explanation of drawings]

Figure 1 is a vertical sectional view of the left half of a poly V pulley, Figure 2 is a vertical sectional view of the left half of a cup-shaped sheet metal member, and Figure 3 is a left half illustrating the manufacturing process of the poly V pulley in Figure 1. FIG. 4 is a left half longitudinal sectional view of another poly V pulley, FIG. 5 is a left half longitudinal sectional view of another poly V pulley, and FIGS. 6 and 7 are conventional FIG. 3 is a vertical sectional view of the left half of the poly-V pulley of FIG. 1... Belt receiving member 2, 12.22... Embedded member 3, 13.23... Pulley body

Claims (1)

[Claims] (1) A pulley body made of synthetic resin, a cylindrical metal belt receiving member having a plurality of mutually parallel V grooves extending in the circumferential direction formed on the outer peripheral surface, and a belt receiving member that is integrated with the belt receiving member. It has an embedded part bent from one end of the receiving member toward the center of the cylinder, and the belt receiving member is fitted into the peripheral wall of the pulley main body, and the embedded member is inserted into the pulley main body during molding of the pulley main body. A poly V pulley characterized by being inserted into.