JPS59126160A - Pulley - Google Patents

Abstract

PURPOSE:To improve the strength of a pulley base plate and provide a compact and light pulley itself by attaching fixedly a reinforcing ring to the inner periphery of large diameter cylinder end outside the pulley base plate to reduce load concentration due to belt tension produced in the connection between said cylinder end and an annular flange. CONSTITUTION:A pulley base plate 1 is formed of a steel sheet to have integrally an annular flange 2 extending radially, a large diameter outside cylindrical portion 3 extending axially from the outer periphery of the flange 2 and a small diameter inside cylinder portion 4 extending axially from the inner peripheral edge of the flange 2. A reinforcing ring 7 comprises a cylindrical portion 8 extending axially and a collar 9 formed in the inner periphery of one end of the cylindrical portion 8 and extending radially inward. The cylindrical portion 8 is press fitted fixedly into the inner periphery of the end of the large diameter outside cylindrical portion 3 such that the collar 9 is located at the flange 2 side. Thus, even if a load is applied to the pulley base plate by belt tension, the load concentration in the connection between the large diameter outside cylindrical portion and the annular flange can be reduced to improve the strength and reduce the thickness of steel sheet itself so that a light and compact pulley can be provided.

Description

Detailed Description of the Invention - This invention has a pulley base comprising an inner small diameter cylindrical part, an outer one large diameter cylindrical part, and an annular flange that connects the two cylindrical parts at intervals in the radial direction. The present invention relates to a pulley in which a rolling bearing is fixed to the circumferential surface of the inner small-diameter cylindrical portion of the pulley base plate, and a belt guide portion is formed on the outer circumferential surface of the outer large-diameter cylindrical portion.

Conventional pulleys of this type include, for example, those shown in Figures 1 and 2.
There is a structure shown in the figure.

The pulley of FIG. 1 has a radially extending annular flange A
1, an outer large-diameter cylindrical portion B1 extending axially from the outer peripheral edge of the flange A1, and an inner small-diameter cylindrical portion C1 extending axially from the inner peripheral edge of the flange A1 are integrally formed by press working from a thin steel plate. to form an IJ-substrate D1 having a U-shaped cross section, and
The outer cylindrical surface of 1 is a belt EII7.1 circular surface, and a rolling bearing F1 is provided on the circumferential surface of the inner small diameter cylindrical portion C1.
The structure is press-fitted and fixed.

However, since such a pulley has a structure in which the belt g+ is supported in a cantilever manner, the load due to belt tension is concentrated at the joint between the annular flange Al and the outer large diameter cylinders HV and Bl, and the pulley board D1 is damaged at the joint. It is easy to break, and in order to prevent this, conventionally the thickness of the thin steel plate itself was increased to increase the strength of the pulley board D1, but this made it difficult to press.
In addition, the pulley board itself has become larger, and the pulley has become smaller.
Problems remained in terms of weight reduction.

The pulley shown in Fig. 2 is made of pulley boards D2 and D3, each having a U-shaped cross section, formed by press processing in the same manner as the pulley board DI of the pulley shown in Fig. 1, with their annular flanges A2 and A3 mutually connected. After butting, they are combined together with rivets G, and the pulley board 1'
l12, D3, each outer diameter 1 large i pre-cylindrical part B2,
The belt E2 is guided by the outer peripheral surface of B3, and the inner small diameter cylinder T
A rolling bearing F2 is fixed to the inner peripheral surface of a5c2 and cl.

In the case of the pulley shown in FIG. 2, the load received by the belt tension is the connection between the annular flange A2 and the outer large-diameter cylindrical part B2 of the pulley boards D2 and D3, and the connection part between the annular flange A] and the outer large-diameter cylindrical part B1. Since the load is distributed to the connecting portion, it is difficult for the connecting portion to break due to the concentration of load as described above. It is necessary to improve the strength of the abutting portions themselves, and the problem arises that the thickness of the annular flanges A2 and A3 themselves and the strength of the rivet G must be increased, and therefore the pulley boards D2 and D3 are also inevitably increased in size. There was a drawback that

In order to eliminate the drawbacks of the conventional pulley structure, the present invention provides a reinforcing ring on the inner periphery of the end of the outer large diameter cylindrical part of the pulley base plate G, and connects the pulley base G outer large diameter cylindrical part and the annular flange. The purpose of this invention is to improve the strength of the pulley board by alleviating the concentration of load due to belt tension that occurs at the joint with the pulley, and to provide a pulley that can be made smaller and lighter. .

The present invention will be explained below based on Examples.

FIG. 3 shows an embodiment of a pulley using a single pulley base plate 1, in which the pulley base plate includes a radially extending annular flange 2; The diameter cylindrical portion 3 and the inner small diameter cylinder @Is 4 extending in the axial direction from the circumferential green portion of the flange 2 are integrally pressed from thin copper (K) and formed into a U-shaped cross section. 05 is a belt. , above) guided by the side large diameter cylindrical part 3,
Further, the rolling bearing 6 is press-fitted into the inner circumferential surface of the inner small diameter cylindrical portion 4 and fixed thereto. Reference numeral 7 denotes a reinforcing ring, which is formed at each cross section consisting of a cylindrical portion 8 extending in the axial direction and a flange portion 9 formed on the circumference of one end of the cylindrical portion 8 and extending inward in the radial direction. is press-fitted and fixed to the end circumferential surface of the outer large-diameter cylindrical portion 3 so that the flange portion 9 is located on the annular flange 2 side.

Further, FIG. 4 shows a U-shaped cross section consisting of an annular flange 12 extending in the radial direction, an outer large-diameter cylindrical part] 3 extending in the axial direction, and a small-diameter cylindrical part on the I/E side] 4, as in the previous embodiment. The belt 15 is guided on the outer peripheral surface of the outer large-diameter cylindrical portion [3] of the pulley board 1], and a rolling bearing [6] is press-fitted onto the inner circumferential surface of the inner small-diameter cylindrical portion [4], and extends in the axial direction. The cylindrical portion]8 of the reinforcing ring 17, which has a linear cross section and is composed of a cylindrical portion]8 and a radially extending collar portion]9, is inserted into the end of the outer large diameter cylindrical portion]3 toward the annular flange 2 side. By press-fitting the periphery of the outer cylindrical part ]3 and fixing the outer surface of the collar part ]9 by caulking the end of the outer cylindrical part ]3,
The principle 17 is fixed inside the outer 1 large diameter cylindrical part 33. The inner diameter portion 19a of the flange portion 9 of the reinforcing ring 7 is extended in the radial direction to form a gap.

Here, the inner surface of the flange 19 of the reinforcing ring [7] is in contact with the outer end surface of the bearing positioning radial flange [4a]4a (1) of the inner small diameter cylindrical portion J4 of the pulley base plate [7], and It is positioned within the outer large diameter cylindrical portion 13.

The embodiment shown in FIG. 5 has two pulley boards 21 and 31.
Similarly to the embodiment shown in FIG. 3, the radially extending annular flange 22, 32, the axially extending outer large diameter cylindrical portion 23, 33, and inner small diameter cylindrical portion 24, 34 are bonded to the thin slag i plate force ≧ They are pressed together to form a U-shaped cross section, and the annular flanges 22. 21.3] is guided by the outer peripheral surface of the outer large diameter cylindrical portion 23.33,
．． 34 is a rolling bearing fixed to the circumferential surface of /bO 27 and 37 are reinforcing rings, respectively, and the outer large diameter cylindrical part 2
3.33 A cylindrical portion 28.38 extending in the axial direction that is press-fitted and fixed to the inner periphery of the end of the cylindrical portion 28.38.
751 and flange portions 29 and 39 extending in the inner diameter direction, the cross section has a single-shape shape.

Furthermore, the embodiment shown in FIG.
1,bj are each formed into a radially extending annular flange 42.52, an axially extending outer large-diameter cylindrical portion 43.53 and an inner small-diameter cylindrical portion 44.54, which are integrally press-formed from a thin steel plate to have a U-shaped cross section. At the same time, the axial length of the outer cylindrical portion 43.53 is made slightly longer than the axial length of the inner cylindrical portion 44.54, and this outer cylindrical portion 843.53
The tips of the two are butted against each other. Reference numeral 47 denotes a reinforcing ring, which is fixed in the axial direction by being press-fitted across the inner peripheral surface of both swords of the outer cylindrical portion 4\53. −
It has a single-shaped cross section consisting of an extending cylindrical portion 48 and a flange portion 49 extending from one end of the cylindrical portion 48 in the inner diameter direction. During the axial fitting between the cylindrical portion 48 of the reinforcing ring 47 and the outer cylindrical portion 43. The flange s49 is arranged as close as possible to the tip of the outer cylindrical portion 43.53.

Nase 45 is the outer large diameter cylindrical part 4 of the pulley board 41.5
The belt 353 is guided by the outer peripheral surface of the belt, and 46 is a rolling bearing fixed to the inner peripheral surface of the inner small diameter cylindrical portion 44.54.

The present invention has the above-described structure, and the reinforcing ring is fixed to the circumferential surface of the tip P9 of the outer large diameter cylindrical portion of the pulley board having a U-shaped cross section, so that even if a load due to belt tension is applied to the pulley board, Since the tip of the outer large-diameter cylindrical portion has high rigidity, it is possible to reduce the concentration of the load on the connection portion between the outer large-diameter cylindrical portion and the annular flange due to deformation of the tip, The strength of the entire pulley can be improved.

Therefore, the thickness of the thin steel plate itself used for the pulley board can be reduced, making press working easier and making it possible to reduce the weight and size of the pulley.

As in the embodiment shown in Fig. 4, by forming a slight gap between the inner diameter of the flange of the reinforcing ring and the extension of the inner ring of the rolling bearing, the flange is provided with a shield plate for the bearing. For example, if you install the pulley with the US side facing forward (2), you can further improve the dustproof performance from this front part 0I11.

Furthermore, the rollers can also function as a cover for the nine bearings.

In addition, as in the embodiment shown in FIG. 6, two pulley boards having a cut-off U-shape are brought into contact with the tips of their outer large-diameter cylindrical parts, and the reinforcing ring is attached to the inner peripheral surface of the two outer large-diameter cylindrical parts. By press-fitting and fixing the pulley across the two, it is possible to increase the rigidity of the tips of both outer large-diameter cylindrical parts with one reinforcing ring, thereby increasing the strength and reducing the weight of the pulley itself. I can highly recommend it.

[Brief explanation of the drawing]

1 and 2 are vertical cross-sectional views showing the structure of a conventional pulley, FIG. 3 is a vertical cross-sectional view showing an embodiment of the present invention, and FIG.
FIGS. 5 and 6 are longitudinal sectional views showing other embodiments of the present invention, respectively.

Claims (1)

[Claims] fl+ has a sheet metal pulley base comprising an inner small-diameter cylindrical part, an outer large-diameter cylindrical part, and an annular flange that connects the two rotary cylinder parts at intervals in the radial direction; A rolling bearing is fixed to the circumferential surface of the inner small-diameter cylindrical portion, a belt guide portion is formed on the outer circumferential surface of the outer large-diameter cylindrical portion, and a reinforcing ring is provided on the inner circumferential surface of the end of the outer large-diameter cylindrical portion. A pulley characterized by being fixed. C2) The pulley according to claim (1), characterized in that the reinforcing ring is formed into a linear cross section consisting of a cylindrical portion and a flange formed on the inner periphery of one end of the cylindrical portion. (3) The pulley base plate includes an annular flange extending in the radial direction, an outer 1 large-diameter cylindrical portion formed by extending in the axial direction from the outer peripheral edge of the flange, and an axially extending annular flange extending from the outer peripheral edge of the annular flange. The reinforcing ring is fixed to the circumferential surface of the distal end of the outer large diameter cylindrical portion of the pulley substrate. The pulley according to any one of Claims (11 or 2) 0 (4) @ one end of the inner ring of the rolling bearing is extended in the axial direction, and the outer circumferential surface of the extended part and the reinforcing ring are Claims characterized in that a slight gap is formed between the inner part of the tsuba (
The pulley according to any one of 1) to C3+. 6) The pulley base plate includes an annular flange extending in the radial direction, an outer large-diameter cylindrical portion extending in the axial direction from the outer peripheral edge of the flange, and an outer large diameter cylindrical part extending in the axial direction from the inner peripheral edge of the annular 7 flange. The above-mentioned pulley substrate is formed by two substrates each having a U-shaped cross section and an inner small-diameter cylindrical portion formed by the above-described method. Within the scope of the claims or (
2. The pulley according to any one of 2. (■ The pulley base plate includes an annular flange extending in the radial direction, an outer large diameter cylindrical portion extending in the axial direction from the outer peripheral edge of the flange, and an outer large diameter cylindrical portion extending in the axial direction from the inner peripheral edge of the annular flange. The pulley is made up of two substrates each having a U-shaped cross section and an inner small-diameter cylindrical portion formed by the above-mentioned methods, and the tips of the outer large-diameter cylindrical portions of the substrates abut each other. 2 with the above-mentioned U-shaped cross section on the outer periphery.
Claims characterized in that the tips of the outer large-diameter cylindrical portions of each of the two substrates are abutted against each other by press-fitting and fixing the inner peripheries. Pulley listed.