JPH064094Y2 - Cage for rolling elements - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cage for rolling elements that are continuously accommodated in a guide body that constitutes a linear guide device or the like.

[Conventional technology]

Conventionally, the present applicant has proposed a linear guide device of this type as the second
The one shown in Fig. 6 is proposed. This device consists of rolling element 1
A retainer 18 for rotatably enclosing 5 and this retainer 18
Guide body 11 having a circulation path 14 for continuously accommodating
And a guide rail 17 for moving the guide body 11 through the rotation of the rolling element 15. As shown in FIG. 27, the cage 18 has a holding portion 181 that exposes and holds the upper and lower surfaces of the rolling element 15 and the rolling element 15.
A housing hole 181a for rotatably housing, a fitting portion 182 formed on both left and right sides and fitted into a guide groove 16 formed in the circulation path 14 of the guide body 11, and push-fitting portions formed on both front and rear sides. The rolling element 15 is configured to circulate in the circulation path 14 in accordance with the movement of the guide body 11.

[Problems to be solved by the invention]

According to such a cage 18, when the rolling elements 15 circulate in the circulation path 14, the pushing portions 183 of the adjacent cages 18 directly contact each other, so that the rolling elements 15 do not directly contact each other. As a result, generation of abnormal noise due to collision between rolling elements and reduction of life due to abrasion of the rolling element surface are prevented.

In order to obtain such an effect, particularly the pushing portion 18 of the cage 18
It is necessary to make 3 thick. However, the pusher 18
When 3 is made thicker, the pitch between the rolling elements 15 increases, and as a result, the rolling elements 1 accommodated in the circulation path 14
The number of 5 is reduced, and the load per rolling element 15 is increased by the reduced amount, and there is a problem in the strength and smooth rotation of the rolling element 15.

In view of such circumstances, the present invention satisfies the original functions of the retainer such as prevention of abnormal noise and smooth rotation of the rolling elements, and can increase the number of rolling elements to be arranged in the circulation path of the guide body. An object of the present invention is to provide a retainer.

[Means and Actions for Solving Problems]

The cage for rolling elements according to the present invention has a convex portion on the front side and a cutting portion on the rear side, and when the rolling element cage is accommodated in the circulation path of the guide body, the convex portion is on the cutting portion of the adjacent cage. It is configured to be loosely fitted and directly contact the rolling element exposed at the cutout portion. Therefore, the pitch between the rolling elements can be reduced because the convex portions directly contact the adjacent rolling elements, and as a result, the number of rolling elements accommodated in the circulation path can be increased.

〔Example〕

Hereinafter, a first embodiment of a rolling element cage according to the present invention will be described with reference to FIGS. 1 to 7. 1 to 3 show a linear guide device in which the cage of the present invention is used. In the figure, reference numeral 1 denotes a guide body in which the stacks 1a and 1b are united by a bolt 2 and a nut 3 via a positioning protrusion 1c, and 4 denotes a cross-sectional shape in which a cage 8 enclosing a rolling element 5 is loosely fitted. A circulation passage formed in the guide body 1 and formed in an annular shape, 6 are formed along both sides of the circulation passage 4, and a retainer 8 is formed.
And a guide groove 7 to be fitted with the lower contact surface 5 of the rolling element 5.
It is a guide rail which has a guide surface 7a that comes into contact with a'and allows the guide body 1 to move linearly.
The cage 8 rotatably accommodates and holds the rolling element 5 made of a metal ball, and is injection-molded using synthetic resin as a material.

As shown in FIGS. 4 to 7, the cage 8 is provided with rolling elements 5
A housing hole 81a that matches the outer diameter of the rolling element 5, a holding portion 81 that exposes and surrounds the upper and lower contact surfaces 5a and 5a 'of the rolling element 5, and is formed on both the left and right outer sides of the holding portion 81. A fitting portion 82 which fits into the guide groove 6 to hold the rolling element 5 in the circulation path 4, a convex portion 83 formed at a substantially intermediate portion in the vertical direction at the front portion of the cage 8. The rolling element 5 is exposed in the groove by cutting a part of the enclosing portion 81 into a groove at the rear portion on the opposite side of the convex portion 83, and the width of the groove allows the convex portion 83 to be loosely fitted. And a cutting portion 84 set to have a sufficient size. The rolling element 5 is securely held by the holding section 81 by inserting the holding section 8 into the housing hole 81a after injection molding alone or by insert molding.

Since the rolling element cage 8 of the present embodiment is configured as described above, it is sequentially fitted into the circulation path 4 from the cutting portion 84 side as shown in FIG. 1, but in this case, the fitting portion 82 is formed. It fits in the guide groove 6 on the guide body 1 side (Fig. 3), and the cages 8 are aligned along the circulation path 4 (see Fig. 2). At this time, the convex portion 83 is the cut portion 8 of the adjacent cage 8.
It fits in between 4 and contacts the surface of rolling element 5 directly. Therefore, the distance between the rolling elements 5 and 5 is determined by the depth of the cut portion 84, that is, the holding portion 8.
It is smaller than that of the conventional structure by the thickness of 1. As a result, the number of rolling elements 5 accommodated in the circulation path 4 increases,
When the guide body 1 slides on the guide rails 7 (arrow A in FIG. 2), the rider portion 4 in the circulation path 4 that should support an external load.
The number of rolling elements 5 in a is increasing.

Thereby, even if the rolling element 5 having the same strength as the conventional one is used, the allowable load of the entire device can be increased, and the strength can be improved. Further, if the external load is constant, the load to be shared by the individual rolling elements 5 is smaller than that of the conventional one, so that the guide body 1 can be smoothly run and the rolling elements 5
Lifespan is improved. Further, as described above, the convex portion 83 comes into contact with the rolling element 5 and the rolling elements 5 and 5 do not come into direct contact with each other, so that abnormal noise such as collision noise and deterioration of the surface of the rolling element 5 due to this will not occur. This is also prevented, and the life of the rolling element 5 is also improved by this.

8 to 11 show a second embodiment. In this embodiment, the convex portions 83 are provided in the upper and lower lower halves of the front portion of the holding portion 8, and the upper half thereof is cut off, and at the rear portion thereof, the cutting portion is point-symmetric with respect to the center of the cage 8. 84
Is provided. In this case as well, the convex portion 83 has the cutout portion 84.
Since it comes into contact with the rolling element 5 exposed by the above, the same operational effect as in the first embodiment can be obtained.

12 to 15 show a third embodiment. In this embodiment, the rolling element 5 is composed of a roller, and the convex portion 83 and the cutout portion 8 are provided.
4 has the same structure as in the first embodiment. Therefore, even if rollers are used, the cage 8 can prevent the so-called skewing of the rolling elements 5, so that the rolling elements 5 can be properly held in the circulation path 4, and the above-mentioned effects regarding strength, life, etc. can be obtained. can get.

16 to 20 show a fourth embodiment. Also in this embodiment, a roller is used as the rolling element 5 as in the third embodiment, and the convex portion 83 and the cutout portion 84 are constructed substantially in the same manner as in the second embodiment. Also in this case, the second
As shown in FIG. 0, the convex portion 83 of the cage 8 housed in the circulation path 4 of the guide body 1 described above is exposed by the cutout portion 84 without contacting the adjacent cage 8, and the rolling element 5 itself. Is to be directly pushed, and the same effect as that of each of the above embodiments can be obtained.

21 to 25 show a fifth embodiment. In this case, projections 82a, 82a fitted to the guide grooves 6 formed in the circulation passage 4 of the guide body 1 on both the left and right side surfaces of the cage 8. ′
The third embodiment has the same structure as that of the third embodiment, except that the structure is formed. Since the retainer 8 is held by the projections 82a and 82a 'through the guide groove 6 of the circulation path 4, it is not necessary to form the outer surface of the fitting portion 82 into a spherical shape as shown in FIG. It is advantageous in terms of molding process.

[Effect of device]

As described above, according to the present invention, the original purpose of the retainer, such as the ability to properly store the rolling elements in the circulation path and the prevention of abnormal noise during operation, and the guide device are achieved. It has advantages in practical use such as improvement in strength and smooth operation.

[Brief description of drawings]

1 to 7 relate to a first embodiment of a rolling element retainer according to the present invention, and FIG. 1 is an exploded perspective view showing an overall structure of a linear guide device to which the retainer of the present invention is applied, 2 is a side sectional view of the linear guide device, and FIG. 3 is a sectional view of FIG.
A sectional view taken along the line III-III, FIG. 4 is a perspective view of a cage containing a spherical rolling element, FIGS. 5 and 6 are plan and front views of the cage, and FIG. 7 is FIG. VII-VII sectional view, FIGS. 8 to 11 relate to the second embodiment, and FIG. 8 is a perspective view of a cage accommodating a spherical rolling element, FIGS.
FIG. 11 and FIG. 11 are plan views, side views and front views of the cage, and FIGS. 12 to 15 relate to the third embodiment.
The figure is a perspective view of a cage accommodating roller-like rolling elements,
FIG. 14 is a plan view of the cage, FIG. 14 is XIV-XIV of FIG.
FIG. 15 is a front view of the cage, FIGS. 16 to 20 are related to the fourth embodiment, and FIG. 16 is a perspective view of the cage accommodating the roller-like rolling elements, and FIG. Figures 18, 18 and 19 are a plan view, a side view and a front view of the cage,
FIG. 20 is a partial sectional view showing the operating state of the cage housed in the guide device, FIGS. 21 to 25 relate to the fifth embodiment, and FIG. FIG. 22, FIG. 23, FIG. 23 and FIG. 24 are plan views, side views and front views of the cage, and FIG. 25 is a side view showing an operating state of the cage housed in the guide device. 26 and 27 are a side sectional view of a conventional linear guide device and a perspective view of a cage. 1 ... Guide body, 4 ... Circulation path, 5 ... Rolling element, 7 ...
… Guide rails, 8 …… Cages, 81 …… Holding parts, 82
...... Insertion part, 83 ...... Convex part, 84 ...... Removal part.

Claims (1)

[Scope of utility model registration request] 1. A cage for a rolling element made of synthetic resin, which wraps around a rolling contact surface of a rolling element that drives a guide body while exposing it, and which is continuously arranged in a circulation path of the guiding body. A convex portion formed and a cutout portion which is formed on the rear side corresponding to the convex portion and exposes a rear surface of the rolling element, the convex portion is formed on the rear surface of the rolling element through the adjacent cutting portions. A rolling element cage characterized in that the cage is in abutment.