JPS5838166Y2 - Cage for split type rolling bearings - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cage for a split rolling bearing used as a connecting rod big end bearing in internal combustion engines such as automobiles and motorcycles, and compressors.

The cage for this type of split rolling bearing is shown in Figures 4 to 6.
As shown in the figure, it consists of two semicircular cage half-holes 1aylb with a substantially M-shaped cross section, and the cage half-holes 1a and lb are spaced at equal lengths on their circumferential surface. A plurality of pockets (Ic) into which the needle rollers 2 can be fitted are provided with their longitudinal directions aligned with the axial direction of the cage.

These two cage halves 1atlb are formed by fitting the needle rollers 2 into the pockets 1c so as to surround the shaft body or inner ring, and joining the circumferential end surfaces of the two cage halves 1a and 1b. A split type rolling bearing is configured in this way.

By the way, in the cage of the conventional split type rolling bearing, as is clear from FIG. 6, each cage is half-closed 1a.

Flange portions 1 extending in the radial center direction are provided at both circumferential ends of 1b.
d, and the radial width dimension of this collar portion 1d was formed to be constant over its entire circumferential length.

When such a split-type rolling bearing rotates, the cage not only rotates but also revolves, and the load acting on the cage is complex, especially when the two cages are partially idle. Abnormal impact force, pressing force, etc. are applied to the portion where the circumferential end surfaces of 1a and 1b are joined.

As a result, stress such as the impact force and pressurizing force is concentratedly applied to the semicircular arc-shaped retainer half body 1at1b at an approximately midpoint in the circumferential direction, resulting in cracks or breakage at that portion. There was a risk of bearing damage.

It was also confirmed that this failure occurred in a bench test using a cage for a split type rolling bearing.

In view of the above-mentioned problems, the present invention is based on the width dimension of the flange extending from the center in the radial direction of each cage half-hoist constituting the cage of a split type rolling bearing. The present invention proposes a new split-type rolling bearing retainer that can prevent damage to the crank and the like by gradually widening the retainer toward the center in the circumferential direction.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The split rolling bearing retainer according to the present invention will be described in detail below with reference to drawings showing embodiments.

In FIG. 1, reference numerals 10a and 1Ob are semi-circular retainer halves having an M-shaped cross section, and this retainer half 10a.

A plurality of pockets into which the needle rollers 2 can fit are formed on the circumferential surface of the roller 10b at equal length intervals, with the longitudinal direction of the pockets aligned with the axial direction of the cage.

And these two cage half-holidays 10a. 10b constitutes a cage.

Now, for example, the flange 10d extending in the radial center direction at the end in the circumferential direction of one of the retainer half-rests 10a has an outer circumferential circle of the flange 10d with an appropriate major radius Ro from the outer periphery center point 0.
The inner circumferential circle of the flange portion 10d is formed by a semicircular arc formed by the outer circumferential center point 0 on a perpendicular line passing through the outer circumferential center point O with respect to the straight line connecting the circumferential edges of the cage half body 10a. An inner circumferential center point O' is set at a position eccentrically outward by the length d, and a semicircular arc is formed from this inner circumferential center point O' with a radius Ri having an appropriate length smaller than the Ro.

Further, the other retainer half 10b also has an outer circumferential circle and an inner circumferential circle defined by semicircular arcs similar to those described above.

In addition, the center of the inscribed circle of the column provided between the plurality of pockets is set at the same position as the outer circumference center point O, because it is necessary to match the center of the bearing. The circle is formed concentrically with the outer circumferential circle of the collar portion 10d.

Therefore, these semicircular arc-shaped retainer halves 10a, 10b have flange portions 10c formed at the side ends of the retainer halves 10a, 10b as they move from both ends in the circumferential direction toward the center in the circumferential direction. The width dimension in the radial direction gradually becomes wider, and in the middle of the circumferential direction, it is widened by a dimension slightly shorter than the eccentric dimension d compared to the width dimension of the flange 10d at both ends in the circumferential direction. ing.

Therefore, it is possible to provide sufficient reinforcement against stresses such as impact force and pressurizing force that are intensively applied to the substantially intermediate position in the circumferential direction of the arc-shaped cage half bodies 10a and 10b. , 10b can be prevented from being damaged.

Next, a method of processing the split type rolling bearing retainer according to the present invention will be explained.

As shown in FIG. 2, the cross section is formed into a substantially M-shape, and a flange equivalent portion 11 is provided that is wider in the radial direction than the required finished dimension,
Further, a cage element body 12 is formed on the circumferential surface thereof to form a small number of pockets into which a plurality of needle rollers 2 can be fitted over a half circumference.

Next, determine the positions where both end faces 13a and 13b of the retainer half-rest should be at a portion that intersects with one diameter of the retainer body 12, and then draw a straight line connecting these both end faces 13a, 13b, that is, orthogonal to the diameter. On the diameter, a radius R of the appropriate length is centered on the inner circumference center point 0', which is eccentric by an appropriate length d from the outer circumference center O of this cage element body 12.
Turning is performed on the flange-corresponding portion 11 by i to form an inner circumferential circle that is eccentric with respect to the outer circumferential surface.

Thereafter, it can be cut at both end surfaces 13a and 13b to obtain the required semicircular arc-shaped retainer half 10a or 10b.

However, in this case, one cage half body 10a or 10b can be obtained by dividing the cage body 12 into two, but the remaining inner part of the cage body 12 will be discarded and the material will be The yield is not good.

FIG. 3 shows a manufacturing method that eliminates the waste of materials as described above.

That is, one cage element body 12 similar to that explained with reference to FIG.
The cage half bodies 12a and 12b are made.

Next, spacers 14, 14 of a suitable shape having a length of 2d are attached to both cage half bodies 12a.

The divided end faces are interposed between the two divided end faces of each of 12b so as to be separated by 2d, and fixed as an annular body.

After that, the center of this annular body, that is, the cage semi-dormant body 12
The center of the line segment connecting the centers 0 and 0 of at12b (a position separated by d from 0) is the inner circumference center point O', and the radius Ri
Turning is performed on the flange-corresponding portion 11 to form an inner circumferential circle eccentric to the outer circumferential circle of the retainer half body 12at12b.

and two spacers 14, 14 and cage half body 1
By separating 2a and 12b, respectively, two cage halves 10a and 10b having the required shape and dimensions are obtained.

According to this method, two cage halves 10 a are simultaneously
, 10 b can be obtained, there is no wastage of materials (cost can be reduced, and it is suitable for mass production).

As described in detail above, according to the split type rolling bearing cage according to the present invention, the cage half body 10a.

Flange portion 10 extending in the radial center direction at the side end portion of 10b
By forming the width dimension of d to gradually increase from the circumferential end of the retainer halves 10a, 1 ob toward the circumferential center, stress concentrated in the circumferential center can be accommodated. The mechanical strength of the cage can be reinforced, and damage accidents such as cracks and breakage of the retainer can be effectively prevented.

On the other hand, if the specifications of the cage are regulated by the strength at the center of the cage half, the dimensions of the flange at the ends of each half of the cage can be narrowed, making it possible to reduce the weight of the cage. become.

As described above, the present invention greatly contributes to improving the strength and reducing the weight of cages for split-type rolling bearings.

[Brief explanation of drawings]

FIG. 1 is a front view of a cage for a split type rolling bearing according to the present invention, and FIGS. 2 and 3 are front views showing a method of machining a cage half-open for a split type rolling bearing according to the present invention.
Fig. 4 is a plan view of a conventional split type rolling bearing cage shown together with needle rollers, Fig. 5 is a sectional view taken along line A-A in Fig. 4, and Fig. 6 is a plan view of a conventional split type rolling bearing cage. It is a front view. 10a, 10b... Cage half-open, 10 d... Flange portion, 12... Cage body, 14... Spacer.

Claims (1)

[Scope of utility model registration request] It is constructed by joining two semi-circular cage half-holes to form a circular shape, and a plurality of pockets into which rollers can be fitted are provided on the circumferential surface of each of the cage half-holes along the length thereof. In a split-type rolling bearing cage opened with its dimensional direction aligned with the axial direction of the cage, a flange is formed at the side end of each half-opened cage so as to extend in the radial center direction, The outer circumferential circle of the flange is formed by a semicircular arc whose center point is the bearing center, and the inner circumferential circle of the flange is formed by a semicircular arc whose center point is eccentrically outward with respect to the center point of the outer circumferential circle. A split type rolling bearing cage, characterized in that the radial width dimension of the collar portion gradually increases from the circumferential end portion of each cage half-opening toward the circumferential center portion. .