JPH0689782B2 - Rolling element cage for rolling bearings - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rolling element retainer for a rolling bearing as a rotation guide element used for a contact surface that moves relatively as one of mechanical elements.

[Conventional technology]

For conventional rolling element cages for rolling bearings, the tubular material is usually the desired length in the longitudinal direction (depending on the height of the annular body).
After being cut into pieces, the radius of the upper edge of the ring-shaped body is drawn slightly larger than the radius of the lower edge, and then the circumference of the ring-shaped body is
A housing row for accommodating rolling elements is drilled through the pressing mechanism, and another pressing mechanism is provided on the inner peripheral surface portions of the upper and lower ring rings of the annular body after the housing row is drilled, Since it is necessary to perform a doweling process for holding the core of the rolling element, the number of processing steps is large.

Particularly, in the housing row drilling process, it is difficult to machine all the circumferential housing rows at the same time. Therefore, the upper housings of the circumferential housing rows must be machined sequentially. Therefore, it was necessary to rotate the ring-shaped body, position it, and repeat the drilling work after positioning. Therefore, it was not labor-saving and lacked in productivity.

Furthermore, it is necessary to arrange the number of ring-shaped rolling element housings having a predetermined circumferential portion as much as possible, but the width of the vertical frame for the boundary between the housings arranged in the circumferential direction and the adjacent housings is used. Since it is difficult in terms of press working technology to make the cross-sectional thickness of the ring-shaped material narrower than that of the material, it is unavoidable to reduce the thickness of the ring-shaped material. (Those of the known type have a thickness of 0.6 mm.) Therefore, the known cage with a row of housings is made of a thin plate material and holds the center of the rolling element in the housing space. Not only is it necessary to form dowels on the surface, but since it is a thin plate material, it lacks rigidity.

Therefore, using a cage made of such a thin material,
When the bearing is mounted on the bearing, it may distort the cage due to centrifugal force during high-speed rotation, which disturbs the smooth operation of the rolling elements and causes unnecessary heat generation due to friction. There were problems such as slight vibrations and other adverse effects on rotation.

An object of the present invention is to reduce the number of processing steps as much as possible, to save labor, and to provide a cage with high productivity at a low cost. Furthermore, a cage having excellent rigidity enables high-speed rotation. An object of the present invention is to provide a rolling element retainer for a rolling bearing capable of smoothing the movement of a rotary contact portion, and a manufacturing method thereof.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the rolling element cage for rolling bearings of the present invention, the material of the annular body of the cage is appropriately cut into a tubular body, and a housing is provided from the circumferential direction to the circumferential direction. Instead of perforating the housings and sequentially arranging the housing rows, the housing rows are pierced by the etching method using a flat material, and at the same time, the outer shape is formed into a predetermined trapezoidal shape.
Next, this trapezoidal material is bent into a ring-shaped body through a press working mechanism, and both end surfaces thereof are laser-welded to each other.

The trapezoidal flat material is curved in an annular shape and has a thickness corresponding to the height at which the dowel is provided without providing the dowel on the inner peripheral wall thereof. It can be shortened and is effective in increasing rigidity.

Then, through the etching method using the flat material, a row of housings for accommodating the rolling elements is bored, and
Manufacture of a holder that joins the first step of forming the outer shape of the material into a predetermined trapezoidal shape, the second step of bending the trapezoidal flat material in an annular shape, and the third step of welding both end surface portions of the annular body to each other. There is a way.

[Action]

As described above, since the flat material having a predetermined thickness is used and the housing row is drilled through the etching method, when the flat material is curved and formed into an annular shape, each housing is Because the openings are radial exactly,
The core of the inserted rolling element can be stably accommodated in the space of the housing, and the environment of high speed rotation can be improved.

Further, since the material forming the ring has a thickness corresponding to the dowel, the core of the rolling element can be stably held.

In addition, since the ring material is formed thick, it has excellent rigidity, and does not cause distortion due to centrifugal force or twisting of the opening wall of the housing even at high speed rotation. It deviates and does not cause unnecessary friction, which is effective in maintaining the load capacity.

〔Example〕

An embodiment will be described with reference to the drawings. In FIGS. 1 to 3, when the cage 1 has an annular shape, it does not have a dowel on its inner peripheral surface, and has a flat low surface having a thickness corresponding to the dowel. Using a carbon steel plate (for example, SPCC plate thickness 1.2 mm), the rolling element accommodating housing rows 2 and 2 are perforated by the etching method based on the housing row pattern suitable for accommodating the predetermined rolling elements, and at that time, the outer shape of the material is used. The flat material 1A formed in a predetermined cup-shaped trapezoidal shape is curved in an annular shape through a press mechanism (not shown), both end surface portions 3 of the annular member are brought into contact with each other, and the end surface portions are mutually laser-welded together. To obtain a cup-shaped product in which the upper edge is slightly wider than the lower edge.

In the embodiment shown in FIG. 1 (b), the rolling element accommodating housing row is arranged in multiple stages in groups A, B and C adjacent to the ring portions 1a, 1b. The relationship between the housing opening core wires of each of the housings and the housing opening core wires of the group B housing rows is that the opening core wires of the lower housings 2, 2 are When the cage 1 is mounted between the inner and outer races of the bearing together with the rolling element by arranging and drilling it at a position offset by 0.2 to 0.5 mm to the left, if the cage is slightly screwed, 1 can be stably held between the inner and outer rings and by the outer peripheral slope thereof.

In the above embodiment, it is of course possible that the thickness of the plate material to be used can be appropriately selected according to the radius of the cage, and the group A, group B and / or group C of the housing rows can be used as axes. Adjacent to the direction, drilled in multiple stages as appropriate, or
The vertical frame sections 4 and 4 are formed at a proper interval in the circumferential direction of the boundary vertical cross sections 4 and 4 of the housing to form a vertical frame section wider than the vertical cross sections 4 and 4,
It is also possible to adopt a configuration in which the rigidity of the cage is increased. (However, illustration is omitted.) It is needless to say that the capacities of the housings 2, 2 and the shape of the opening surface can be appropriately designed and implemented in accordance with the design of the rolling elements, and are arranged in the circumferential direction. The number of arranged housings 2, 2 can be appropriately designed and implemented according to the rolling bearing application and its load.

Next, the manufacturing process of the cage 1 for the rolling element of the rolling bearing is as follows: (a), 1st step Using a thin plate of low carbon steel plate having a predetermined width, the rolling element accommodating housings 2 and 2 rows are laterally arranged. Etching based on a section in which the rolling element accommodating housings 2 and 2 are arranged in multiple stages adjacent to the annulus (circumferential direction) and, if necessary, in the longitudinal direction (axial direction), and the external shape is formed in a trapezoidal shape. The process of drilling.

(B), 2nd step A step of bending the flat material 1A having the above-mentioned housing 2 and 2 rows perforated and having a trapezoidal outer shape into an annular shape through a pressing mechanism.

(C), Third step Both end edge portions 3 of the curved annular member,
3 is brought into contact with each other, and the process of laser welding to each other is combined to manufacture.

[Invention effect]

Since the present invention is configured as described above, it has the following effects.

(A) Since the flat material is used instead of the tubular material, the work of boring the housing is extremely labor-saving and the productivity is excellent.

(B) Since the housing row is drilled through the etching method using a flat material, the shape, capacity, and
The dimensional accuracy is extremely high, and the rolling elements can continue smooth rolling in the housing without fear of distorted friction.

(C), the flat material is made thicker (the dowel is not protruded, and the thickness corresponding to the dowel is added), and after the housing row is drilled, it is curved in an annular shape, and the both end edges thereof are welded by laser welding. As a result, the molten metal does not escape to the side at the butt end face, and thus there is no risk of burrs, and the rigidity in the circumferential and axial directions increases, so that the cage is retained even during high-speed rotation. Since there is no risk of distortion,
In the housing, the rolling element slides along the axis of the housing, and it is possible to prevent the occurrence of flat friction, and there is no danger of heat generation or one-sided slippage. Can be improved.

(D), the number of manufacturing steps is small, labor-saving and highly productive,
Extremely cheap (approx. 1/6 unit price of the current market price calculated by the inventor)
The invention has various industrial effects such as being provided.

[Brief description of drawings]

In the accompanying drawings showing an embodiment, FIG. 1 (a) is a plan view of a cage of the present invention, and FIG. 1 (b) is a perspective explanatory view thereof.
FIG. 2 is a front view of the flat material, FIG. 3 (a) is a plan view of a known cage, and FIG. 3 (b) is a perspective view of the same. DESCRIPTION OF SYMBOLS 1; cage, 2, 2; housing, 3, 3; end face portion, 4, 4; boundary vertical crossing portion, 1a, 1b; ring portion, group A, group B, group C; housing row, 5,5; Dowel

Claims (1)

[Claims] 1. A rolling element retainer for rolling bearings, wherein a row of housings for accommodating rolling elements is bored in multiple stages in the circumference of an annular body, and the annular body is made of a flat material by an etching method. According to the rolling bearing retainer for rolling bearings, in which the housing is bored, and the end surfaces are welded to each other, the flat material of the annular body is at least formed on the inner peripheral wall of the annular body. A low-carbon steel material having a thickness corresponding to the thickness of the dowel is used, and each opening window of the lower row of housings is positioned lower than the position of each opening window of the upper row of housings accommodating the rolling elements. The position of is shifted to the left, and the phase is sequentially displaced and arranged.
A rolling bearing characterized in that the width of the vertical rail between the housings arranged in multiple stages is formed by intermittently forming wide vertical rails at appropriate intervals along the rotation direction of the annular body. Rolling element cage.