JPS60252856A - Roller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a hollow portion, a folded cylinder portion extending in the axial direction from one end of the hollow portion into the hollow portion in a folded manner;
The bottom provided at the tip of the folded tube part above! a support supporting a rolling bearing on the outer periphery of the hollow portion; a screw passing through the hole in the bottom for fixing to a machine block or the like; and a screw rotating on the support through the rolling bearing. The present invention relates to a roller consisting of a possibly mounted roller body, in particular a roller such as a tensioner 7'-IJ for belt transmission.

Such a roller is known from FIG. 1 of West German Utility Model No. 8025902. In this prior art example, the head of the screw rests on the bottom surface facing the folded tube portion at the bottom, and the support body is pressed and fixed to the machine block with its end surface that does not have the folded tube portion.

In this case, the bottom for tightening the screw is curved and recessed towards the machine block, and the support is radially retracted and retracted. In other words, since the end surface of the folded cylindrical portion is free, it is possible to contract in the radial direction. This increases the radial play of the rolling bearing, which is arranged on a raceway machined on the outer periphery of the support, and also increases the amount of play in the radial direction of the rolling bearing, if the inner ring of the rolling bearing is fitted onto the support. loosens. This causes premature failure of the roller in both cases. In addition, in the case of a roller that is eccentrically passed through the bottom of a fixing screw and rotates around this screw to adjust the tension, the orbit deviates from its circular shape, which causes the rolling bearing to deteriorate more quickly. The above effects are especially true when the support is made of thin metal sheet for affordability and ease of molding.

The object of the invention is to create a roller whose support is stable in shape, at least in the area of the rolling bearing, when the support is fixed through the bottom.

This problem is solved by arranging the support on the machine block with its end face adjoining the folded tube and by arranging the head of the fixing screw 1 on the bottom side opposite the folded tube. .

In this structure, when fixing with a screw, the bottom curves and the folded tube first contracts from the end portion of the bottom and deforms into a conical shape. The other end of the folded tube, which transitions into the hollow part, is pressed against the machine block, so that the hollow part does not contract, so that the area of the rolling bearing is not affected by the shrinkage.

As a result, deformation of the rolling bearing raceway and dislocation of the inner ring will not occur.

Preferably, an annular gap l is provided between the hollow part and the folded cylinder part. This annular gap is particularly advantageous when there is a risk that some portion of the folded tube will expand due to the curvature of the bottom. In particular, if the folded tube section is long in the axial direction, the folded tube section may deform into a barrel shape. In this case, the annular gap absorbs the deformation of the barrel shape and prevents the folded cylindrical portion from coming into contact with the center portion from the inside and causing an adverse effect.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a cylindrical support whose outer periphery is machined with the raceway of a ball bearing, and the outer ring 3 of the bearing is supported on the outer periphery of the roller body qt support. The support body is formed from a thin metal plate, and has a hollow part, S
It integrally has a folded tube part 6 that protrudes into the hollow part in a folded manner at one end of the hollow part, and a bottom that closes the tip of the folded tube part B. As shown in the figure, there is an annular gap between the outer periphery of the folded tube part and the inner periphery of the hollow part.

Then, the end surface g formed by the folded tube part 6 and the hollow part S makes contact with the machine block 9 of the support 1 and fixes it to the machine block Te. For this purpose, pass 10% of the screw through the hole in the bottom 9, and this screw! Screw it into the screw hole // of the machine block 9 and tighten.

Since the hole in the bottom is eccentric, the belt (not shown) can be stretched by rotating the roller around the screw 70. There is a hole on the bottom 7 for hanging the tool/2
is the provision. Is it the bottom when I tighten the screw 10 inches? curves towards the mechanical block, so the bottom? and the corner of the folded tube part Otsu (
The region /3 of the corner) is retracted in the radial direction. The support body/ is strongly pressed against the machine block 9 by the axial force acting on the machine block 9 through the folded tube part 6 and the end surface gy (through it).As a result, the folded tube part contracts and deforms into a conical shape. The effect of shrinkage is not transmitted to the hollow part where the rolling bearing is fitted around the outer periphery.

In order to dampen vibrations during operation, it is recommended that an elastic shock absorber/I' be interposed between the bottom and the machine block as shown in the figure.

In the illustrated example, the axial length of the folded tube portion 6 is short, but it may be made longer.

[Brief explanation of the drawing]

The drawing is a sectional view showing a roller according to an embodiment of the present invention, in which / is a support body, C is a rolling bearing, ri is a roller body, 3 is a hollow part, 6 is a folded cylinder part, 7 is a bottom, and g is an end face, 9 is a mechanical block, and 10 is a screw.

Claims (2)

[Claims] (1) a hollow part S; a folded cylindrical part 6 extending in the axial direction from one end of the hollow part into the hollow part in a folded manner;
a support body/supporting body, which includes a bottom 7 provided at the tip of the folded cylindrical portion and supports a rolling bearing on the outer periphery of the hollow portion;
A screw io that is passed through a hole and fixed to a machine block t, etc.
and a roller body t rotatably mounted on the support body via the above-mentioned rolling bearing 2. Low 2° characterized in that the head of 10 is distributed on the opposite side of the folded tube part 6 of the bottom 7. (2) The roller according to claim (1), wherein an annular gap is provided between the hollow portion and the folded cylindrical portion 60.