CN202140425U

CN202140425U - Large and medium-sized four-point contact ball bearing

Info

Publication number: CN202140425U
Application number: CN201120249269U
Authority: CN
Inventors: 吴朝阳; 张松; 黄淑英
Original assignee: Changzhou Guangyang Bearing Co Ltd
Current assignee: Changzhou Guangyang Bearing Co Ltd
Priority date: 2011-07-15
Filing date: 2011-07-15
Publication date: 2012-02-08
Anticipated expiration: 2021-07-15

Abstract

The utility model relates to a large and medium-sized four-point contact ball bearing comprising an outer ring, two split inner rings, rolling bodies and a retainer, wherein pocket holes are uniformly distributed in the retainer along the peripheral direction; the rolling bodies are arranged in the pocket holes and are arranged between the outer ring and the two inner rings; embossing sections arranged at equal intervals are arranged on the inner peripheral wall of the retainer along the circumference direction; the bore diameter of the pocket hole is larger than the width of the embossing section; arc-shaped locking edges are arranged at two ends of the embossing section and extend to the central axis of the pocket hole; each two arc-shaped locking edges at each pocket hole form a fore shaft; and the overall arc length of each two arc-shaped locking edges is 2/5 to 1/3 of the line contact arc length of the rolling body. With the large and medium-sized four-point contact ball bearing, the assembly process can be simplified, the assembly precision and the assembly efficiency of the bearing can be improved, the friction resistance in the working of the bearing can be reduced, and the service life of the bearing can be prolonged.

Description

Big-and-middle-sized four-point contact ball

Technical field

The utility model relates to a kind of big-and-middle-sized four-point contact ball, belongs to technical field of bearings.

Background technique

Four-point contact ball belongs to a kind of radially single-row angular contact ball bearing; Raceway is to be used for the thrust load of supporting effect on both direction; Compare with double row bearing; The axial space that takies can reduce significantly, and it bears very big radial load and axial load under high rotational speed, so four-point contact ball is used in the motor more.Present four-point contact ball comprises inner ring and the rolling element and the retainer of outer ring, two splits, and the retainer upper edge circumferentially is evenly equipped with the pocket hole, each rolling element be installed on the retainer respectively and be arranged on outer circle rack and two inner rings between; Retainer plays equidistant separation roller and prevents that rolling element from dropping, and guiding also drives the effect that rolling element rotates, and the wrapping angle of bearing is at 35～45 °; Because the size of four-point contact ball is mostly more than 150mm; Therefore its outer ring, inner ring and retainer adopt metal to make, and especially retainer adopts Cu alloy material to process, fore shaft in retainer adopts; When retainer fore shaft amount excessive; Cause rolling element to get in the pocket hole less than retainer, and retainer fore shaft amount is little, can cause rolling element to break away from the pocket hole again.But retainer is a kind of at present is that cylindrical hole is processed in the pocket hole; Rolling element is installed in through riveting technology rolling element carried out behind the pocket hole spacingly again, make the distortion of pocket bore portion produce fore shaft through riveting technology, but riveting technology is difficult for guaranteeing that each fore shaft position is identical; Be prone to cause hold depth different; And can reduce bearing accuracy, under the condition that runs up, can cause bearing load carrying capacity to descend, and produce noise and cause lose efficacy the period of bearing; The bearing of this structure also exists the assembly technology complicacy, the problem that efficiency of assembling is low simultaneously.The retainer of the four-point contact ball that for this reason also has adopts has even distribution shoulder hole spacing to coming rolling element; Fore shaft and pocket hole in this shoulder hole comprises; Cylindrical hole is adopted in interior fore shaft and pocket hole, and simplify technology and improve efficiency of assembling to reach, but owing to fore shaft is made up of cylindrical hole; Therefore when rolling element is pressed into fore shaft; Rolling element is that annular wire contacts with fore shaft, therefore increased again when the rolling element assembling is pressed into power and fore shaft between surface friction drag, the pressure when therefore needing increase to add rolling element to be pressed into fore shaft and increase the difficulty of assembling; Perhaps satisfy installation requirement, therefore be difficult to reach the requirement that improves efficiency of assembling and installation precision simultaneously through the hold depth that reduces fore shaft.Moreover, be prone to the fretting wear and the heating of generation because four-point contact ball is mounted in the motor, and in the high speed operation, the fore shaft on the retainer and the area of contact of rolling element are big, and the normal use of influence power bearing.

Summary of the invention

The purpose of the utility model provides a kind of big-and-middle-sized four-point contact ball that improves efficiency of assembling and precision.

The utility model is that the technological scheme that achieves the above object is: a kind of big-and-middle-sized four-point contact ball; The inner ring and rolling element and the retainer that comprise outer ring, two splits; The retainer upper edge circumferentially is evenly equipped with the pocket hole, and each rolling element is installed in each pocket hole respectively and is arranged between outer ring and two inner rings, it is characterized in that: said retainer inner circle wall along the circumferential direction is provided with five equilibrium raised section at interval; The aperture in each pocket hole is greater than the width dimensions of each raised section; The two ends, raised section have the arc lock seaming to pocket hole extension of central axis, and each pocket hole two arcs lock seaming constitutes fore shaft, and total arc length of two arcs lock seaming is 2/5～1/3 of a rolling element line contact arc length.

Fore shaft on each pocket hole of the utility model retainer is to be made up of the arc lock seaming of two ends, raised section to pocket hole extension of central axis; So can make the interior fore shaft on the retainer through machining; Making fore shaft is the circumferencial direction setting along retainer, and bearing can be in working state preferably, the processing that the utility model can conveniently be lockstitched a border to two arcs; Guarantee the machining accuracy of each pocket hole and arc thereof lock seaming; So can simplify assembly technology, and improve the efficiency of assembling and the assembly precision of bearing, make bearing keep proper functioning.Each pocket hole on the utility model retainer is carried out spacing through the lock seaming of two arcs to rolling element; Total arc length is merely 2/5～1/3 of rolling element line contact arc length and two arcs are lockstitched a border; Therefore rolling element contacts with the line that fore shaft is merely part, under the reasonable hold depth prerequisite that guarantees the retainer fore shaft, neither can cause rolling element to break away from the pocket hole; Also can conveniently rolling element be pressed in the pocket hole of retainer; Simultaneously also can reduce surface friction drag between rolling element and the fore shaft, and improve bearing fretting wear and heating value in high speed operation, can improve the working life of bearing.

Description of drawings

Below in conjunction with accompanying drawing the embodiment of the utility model is made further detailed description.

The structural representation of the big-and-middle-sized four-point contact ball of Fig. 1 the utility model.

Fig. 2 is the structural representation of the retainer of model utility.

Fig. 3 is the A-A sectional structure schematic representation of Fig. 2.

Fig. 4 is the I place structure for amplifying schematic representation of Fig. 2.

Wherein: 1-outer ring, 2-rolling element, 3-retainer, 31-pocket hole, the lock seaming of 32-arc, 33-raised section, 4-inner ring.

Embodiment

See shown in Fig. 1～4 that the big-and-middle-sized four-point contact ball of the utility model comprises inner ring 4 and the rolling element 2 and the retainer 3 of outer ring 1, two splits; Retainer 3 upper edges circumferentially are evenly equipped with pocket hole 31, and are as shown in Figure 1, can adopt 12 pocket holes 31; Each rolling element 2 is installed in each pocket hole 31 respectively and is arranged between outer ring 1 and two inner rings 4; The retainer 3 that makes inner ring 4, outer ring 1 and rolling element 2 is housed combines and constitutes bearing, and the wrapping angle α of big-and-middle-sized four-point contact ball can be 30 °, or wrapping angle is 35 °; Or 45 ° of 40 ° of wrapping angles or wrapping angles etc.; The inboard in each pocket hole 31 is provided with fore shaft on the retainer 3, and the mounting center of rolling element 2 is of a size of φ 1, and the aperture size of this fore shaft is less than 0.015～0.05mm of rolling element 2 diameters.See shown in Fig. 1～4 that the utility model retainer 3 inner circle walls along the circumferential direction are provided with five equilibrium raised section 33 at interval, each pocket hole 31 is arranged between each raised section 33; Each raised section 33 is tilting and transit to the inner circle wall of retainer 3 along circumferential both sides, and the angle γ between the inner circle wall of the bi-side of raised section 33 and retainer 3 seamlessly transits to the inner circle wall of retainer 3 each raised section 33 at 35 °～50 °; Be convenient to process fore shaft, the aperture in each pocket hole 31 is greater than the width dimensions of each raised

section

33, and 33 two ends, raised section have the arc lock seaming 32 to pocket hole extension of central axis; The 31 liang of arc lock seamings 32 in each pocket hole constitute fore shaft; Total arc length of two arcs lock seaming 32 is 2/5～1/3 of rolling element 2 line contact arc lengths, owing to reduce the line contact length of rolling element 2 and two arcs lock seaming 32, conveniently rolling element 2 is pressed in the pocket hole 31 of retainer 3 during assembling; And can not cause rolling element 2 to break away from pocket hole 31 yet; Moreover also can reduce surface friction drag between rolling element 2 and the fore shaft, each arc lock seaming 32 of the utility model is the circumferencial direction settings along retainer 3, so two arcs lock seaming 32 is positioned at the circumferentially spacing of rolling element 2 on each pocket hole 31; See shown in Fig. 2～4; The aperture of the utility model arc lock seaming 32 and the aperture in pocket hole 31 are the same center of circle, can be convenient easy to process, and it is high to improve the processing essence.

See shown in Fig. 1～4 that the distance L between the aperture of the utility model arc lock seaming 32 and the hole wall in pocket hole 31 can be controlled in 0.15mm at 0.12～0.25mm like this distance L; 0.20mm; 0.22mm etc., and the thickness of arc lock seaming 32 at H at 1～3mm, can be controlled in 1.5mm, 2mm or 2.5mm etc. like thickness H; For the rolling element 2 of different size, make fore shaft on the retainer 3 have rational hold depth and mechanical strength preferably.

See shown in Figure 4ly, the utility model is for ease of leading to the rolling element 2 that is pressed into, and each pocket hole 31 transits to raised section 33 through internal taper hole, and the tapering 6 of internal taper hole is controlled at 15 °～25 °, through this internal taper hole is convenient rolling element is imported in the pocket hole 31.

Claims

1. big-and-middle-sized four-point contact ball; The inner ring (4) and rolling element (2) and the retainer (3) that comprise outer ring (1), two splits; Retainer (3) upper edge circumferentially is evenly equipped with pocket hole (31); Each rolling element (2) is installed in each pocket hole (31) respectively and is arranged between outer ring (1) and two inner rings (4); It is characterized in that: said retainer (3) inner circle wall along the circumferential direction is provided with five equilibrium raised section (33) at interval, and the aperture in each pocket hole (31) is greater than the width dimensions of each raised section (33), and two ends, raised section (33) have the arc lock seaming (32) to pocket hole extension of central axis; Each pocket hole (31) two arcs lock seaming (32) constitutes fore shaft, and total arc length of two arcs lock seamings (32) is 2/5～1/3 of rolling element (a 2) line contact arc length.

2. big-and-middle-sized four-point contact ball according to claim 1 is characterized in that: the distance L between the aperture of said arc lock seaming (32) and the hole wall of pocket hole (31) at 0.12～0.25mm, thickness H at 1～3mm.

3. big-and-middle-sized four-point contact ball according to claim 1 is characterized in that: said each pocket hole (31) transits to arc lock seaming (32) through internal taper hole.

4. according to claim 1 or 2 or 3 described big-and-middle-sized four-point contact balls, it is characterized in that: the aperture of said arc lock seaming (32) and the aperture of pocket hole (31) are the same center of circle.