JPS5923120A - Direct-acting ball bearing - Google Patents

Abstract

PURPOSE:To aim at remarkable reduction of a frictional force in circulating movement, by arranging inclined channel rings formed with relay tracks at both ends of a sleeve including a load track and a non-load track in a direct-acting ball bearing. CONSTITUTION:Relay tracks 16 and 17 for allowing a free rotation of rotary members 12, having the same set as that of a load track 13 and a non-load track 14, are formed in the axial direction of inclined channel rings 18 which are fitted in both ends of a sleeve. Each relay track 16 is slightly inclined relative to the axis of the sleeve in such a manner that openings of each relay track 16 continuing to each load track 13 are offset to the outwardly radial direction at end surfaces contacting with end rings 19 provided outside of the inclined channel rings 18. In this manner, the inclined angle of the relay tracks 16 relative to the axis of the sleeve is set to a small amount, thereby effecting remarkably smooth circulating movement of the rotary members in the direction from a load area to a non-load area, and vice versa.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a linear motion ball bearing that moves a shaft in a straight line, and in particular to a linear motion ball bearing that is adapted to a shaft with a very small diameter.

For example, Japanese Patent Publication No. 41-1364 (Fig. 1).

As shown in FIG. A U-shaped circulator 4 is attached to form a plurality of closed oval rolling element circulation paths, and both ends thereof are fixed with side plates 6 to freely transfer and circulate the rolling elements 5 in each circulation path. Strained linear ball bearings are known.

However, in such a conventional device, when the rolling elements circulate in the circulation path, they receive the load and transfer it directly to the 9-inch circulator, or directly from the circulator to the load section, so that there is a problem in the circulation. The frictional force was large and there were performance problems. Unfortunately, conventional direct-acting ball bearings can only be used with a shaft diameter of six inches at most, and there is nothing that can be used for shafts with smaller diameters.

On the other hand, recently, the demand for ultra-compact, low-friction, and inexpensive linear motion rolling bearings has been increasing in the fields of computers, electrical products, etc. This invention is based on the above-mentioned linear motion ball bearings. The purpose of this invention is to provide a high-performance and low-cost product that enables ultra-miniaturization with low frictional force.

To explain the embodiment, in FIGS. 3 to 8,
Sleeve 1 having an inner diameter slightly larger than the diameter of the shaft 10
1, a load track 13 that partially exposes the rolling elements 12 and brings them into rolling contact with the shaft 10, and freely transfers and circulates the rolling elements 12;
A plurality of sets (at least 3 sets, implemented) of a no-load track 14 which is located on the outer diameter side of the raceway 13 and forms a slight clearance between the raceway 13 and the rolling element 12 and freely transfers and circulates the rolling element 12. In the example, four pairs of sleeves 11 are provided to extend through the sleeve 11 in parallel with the axis, and cylindrical portions 15 are formed at both ends of the sleeve 11, respectively.

In the cylindrical portion 15 at both ends of the sleeve 11, a slight gap is formed between the rolling elements 12 and the loaded raceway 13 and the unloaded raceway 14, respectively, so that the rolling elements 12 can freely roll. The same number of tracks 16.1 and 140 sets of the loaded track 13 and the unloaded track are fitted and fixed with diagonal groove widths 18 extending in the axial direction. At least each relay raceway 16 that is continuous with each load raceway 13 is arranged so that the opening of the raceway 16 is deviated toward the outer diameter side at the outer end side of the diagonal groove width 18, that is, at the end face side in contact with a side wheel 19, which will be described later. tilt slightly with respect to the axis.

The cylindrical portion 15 at both ends of the sleeve 11 is further provided with a diagonal groove width 18.
in contact with the outer ends in the axial direction, respectively continuous with the pair of relay raceways 16.17, and forming a circulation path for the rolling elements 12 closed in an oval shape in cooperation with the respective raceways 13, 14, 16, and 17. The side wheels 19, which are provided with the same number of semicircular arc-shaped circulation grooves 20 as the respective sets of tracks, are fitted and fixed.

That is, the cylindrical portions 15 at both ends of the sleeve 11 are fitted with the diagonal groove width 18 and the side wheels 19, respectively, and are fitted and fixed, and the rolling elements 12 are arranged in a closed oval circulation path. Although the sleeve 11 and the pair of diagonal groove rings 18 and the pair of side wheels 19 are arranged in a cylinder separate from the sleeve in the same manner as described above, Alternatively, instead of the cylindrical body, a housing to which a linear motion ball bearing is assembled may be used. Further, it is preferable that the inner diameters of the oblique groove ring I8 and the side ring 19 be the same as the inner diameter of the sleeve 11, and form a slight clearance 1 with respect to the shaft 10.

Any or all of the sleeve 11, oblique groove ring 18, and side ring 19 can be formed from a synthetic resin material containing reinforcing material such as carbon fiber, ceramic, sintered alloy, or the like. The materials used are selected appropriately depending on the purpose of use.

The present invention has the above-described configuration, and includes a loaded track and an unloaded track #1. ; Since a diagonal ring with a relay raceway is arranged at both ends of the sleeve having a neck, and a side ring with a semicircular circulation groove is arranged at the outer end in the axial direction, the inclination angle of the relay raceway with respect to the axis is By arbitrarily selecting , or by appropriately determining the axial length of the relay raceway, it is possible to significantly increase the diameter of the shaft on which the rolling elements roll into contact, to the J1 diameter, compared to the conventional method. Ultra-miniaturization of linear motion ball bearings can be achieved extremely easily. Furthermore, by setting the inclination angle of the diagonal groove ring to the axis of the relay raceway to be small, the rolling elements can circulately move from the load area to the no-load area or in the opposite direction very smoothly and effortlessly. This makes it possible to significantly reduce the frictional force during the circulation movement compared to the conventional one, and to provide a linear motion ball bearing with an extremely simple structure and high performance.

The trench sleeve, diagonal groove ring, and side ring are easy to process, and there is no need for a circulator formed from a tubular body, so the price can be kept extremely low.

Furthermore, by molding each of the above-mentioned members from synthetic resin, ceramic, etc., it is possible to reduce the required costs and reduce the weight of the bearing, and the inertia force during the operation of the direct-set 11-ball bearing can be significantly reduced. can do.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view taken along line 1-I in Fig. 2 of a conventional linear motion ball bearing, Fig. 2 is a longitudinal sectional view taken along line IT-IT in Fig. 1, and Fig. 3 is a cross-sectional view of a conventional linear motion ball bearing taken along line IT-IT in Fig. 1. The half longitudinal cross-sectional views, FIGS. 4 and 5, are cross-sectional views taken along the lines ■--■ and ■--■ in FIG. 3, respectively, and FIG. 6. 7 is a side view of the side wheel and diagonal groove ring as seen from the ■-■ line and the ■-vll line of FIG. 3, respectively, and FIG. 8 is a side view of the diagonal groove ring. 5 is a longitudinal sectional view taken along the line ■-■ in FIG. 4. FIG. DESCRIPTION OF SYMBOLS 10... Shaft, 11... Sleeve, 12... Rolling element, 13... Load raceway, 14... No-load raceway, 15...
... Cylinder part, 16° 17 ... Relay track, 18 ... Diagonal groove ring, 19 ... Side ring, 20 ... Circulation groove Applicant: Koyo Seiko Co., Ltd. " Figure 1 Figure 4

Claims (1)

[Claims] (1) A loaded raceway in which the rolling elements are partially exposed and roll in contact with the shaft, and a non-loaded raceway in which the rolling elements are also located on the outer diameter side and the rolling elements freely roll. a sleeve in which at least three sets of A circulation path for rolling elements, which is disposed through the diagonal groove ring and is disposed at the outer end in the axial direction of the diagonal groove ring and is continuous with the relay raceway that connects the pair, is cooperating with each of the raceways and is closed in an oval shape. and a side ring provided with a semicircular circulation groove to form a semi-circular groove, and each relay raceway continuous to at least each of the load raceways of the diagonal groove ring is offset toward the outer diameter side at the end surface on the side wheel side of the diagonal groove ring. It is slightly tilted with respect to the axis of the bearing so that each raceway and the circulation groove are continuous so that the rolling elements are freely transferred and circulated within the closed oval circulation path.
A linear motion ball bearing (2) characterized in that the sleeve, each oblique groove ring and a side ring are integrally positioned and fixed. A linear motion ball bearing according to claim (1), wherein at least one of the sleeve, diagonal groove ring, and side ring is made of synthetic resin, ceramic, or sintered. Claims (1) or (2) molded from any of the bonded metals.
) Linear motion ball bearings listed in