Bearing and outer ring manufacturing method thereof

Abstract

The present invention discloses a bearing and a method for manufacturing its outer ring. The bearing comprises an outer ring, an inner ring, a plurality of balls, a retaining cage, and two dust covers. The outer ring has a first spiral groove and a second spiral groove. The first spiral groove and the second spiral groove are both disposed on the outer wall surface of the outer ring, intersecting and mirror-symmetrically with each other. The bearing of the present invention forms intersecting first and second spiral grooves by machining the outer surface of the outer ring. Compared to the two parallel grooves on the outer surface of the outer ring of existing bearing products, the intersecting first and second spiral grooves can enhance the bonding performance between the outer surface of the bearing outer ring and the polyurethane material. The present invention discloses a method for manufacturing a bearing outer ring. The first and second spiral grooves are machined using numerical control technology, which can significantly improve product yield and processing efficiency, thereby enabling mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular to a bearing and a method for manufacturing an outer ring thereof. Background Art

[0002] Bearings have a wide range of applications. Elevator bearings are widely used in escalators at airports, shopping malls, and train stations, as well as in elevators in high-rise residential buildings. Existing elevator bearings typically feature a standard bearing with an enlarged outer diameter and two parallel annular grooves machined into the outer surface of the outer ring. This allows for a polyurethane sleeve to be wrapped around the outer surface of the bearing ring. This polyurethane sleeve increases the bearing's load-bearing performance and reduces noise.

[0003] Existing elevator bearings functioned normally during the initial delivery phase of equipment engineering. However, after a period of use, the polyurethane sheathing on the bearing surface began to peel off, causing vibration, noise, poor operation, and even seizures during elevator operation. This was due to insufficient adhesion between the polyurethane material and the outer surface of the bearing outer ring, which resulted in the polyurethane sheathing easily peeling off. Summary of the Invention

[0004] Based on this, it is necessary to provide a method for manufacturing a bearing and its outer ring to address the technical problem that the polyurethane material sleeve on the existing bearing surface is easy to fall off.

[0005] A bearing comprises an outer ring, an inner ring, a plurality of balls, a retainer and two dust covers. The inner side wall of the outer ring is sleeved on the outer side wall of the inner ring, and the plurality of balls, the retainer and the two dust covers are all arranged between the outer ring and the inner ring.

[0006] The outer ring has a first spiral groove and a second spiral groove. Both are located on the outer wall of the outer ring. The first spiral groove spirals from the chamfered surface at one end of the outer ring's outer wall toward the other end. The second spiral groove, on the other hand, begins at the chamfered surface at the other end of the outer ring's outer wall and spirals toward the end of the first spiral groove's starting point. The first and second spiral grooves intersect and are mirror-symmetrical.

[0007] In one embodiment, the outer ring comprises an outer channel, an outer sealing groove, and an outer mounting surface. The outer channel is disposed along the inner sidewall of the outer ring in the middle of the inner sidewall; the outer mounting surfaces are disposed along the inner sidewall of the outer ring on either side of the outer channel; and the outer sealing grooves are disposed along the inner sidewall of the outer ring at the two side edges of the inner sidewall.

[0008] In one embodiment, the inner ring comprises an inner channel, an inner sealing groove, and an inner mounting surface. The inner channel corresponds to the outer channel and is disposed in the middle of the outer wall of the inner ring; the inner mounting surface corresponds to the outer mounting surface and is disposed on either side of the inner channel along the outer wall of the inner ring; and the inner sealing groove corresponds to the outer sealing groove and is disposed on either side of the outer wall of the inner ring.

[0009] In one embodiment, the outer mounting surface and the inner mounting surface cooperate to form a mounting interlayer, and the retaining frame is correspondingly mounted in the mounting interlayer.

[0010] In one embodiment, the outer channel and the inner channel correspond to each other to form a channel, and a plurality of balls are installed in the channel and correspond to each other in the retaining frame.

[0011] In one embodiment, the outer sealing groove and the inner sealing groove cooperate to form a sealing groove, and two dust covers are respectively disposed in the sealing groove and cover both sides of the retaining frame.

[0012] A method for manufacturing an outer ring of a bearing, the method being used to manufacture the outer ring of the bearing, comprising the following steps:

[0013] S1. Turning the forged bar to obtain the outer ring blank;

[0014] S2. Rough turning of the inner diameter and end face of the outer ring blank;

[0015] S3, turning the outer diameter and the other end face of the outer ring processed in S2;

[0016] S4, perform end face finish turning on the outer ring processed in S3;

[0017] S5. Turning the outer ring processed in S4 to form chamfers, an outer groove, an outer sealing groove, a first spiral groove, and a second spiral groove;

[0018] S6. Heat treatment is performed on the outer ring after machining.

[0019] S7, performing double end surface rough grinding and fine grinding on the outer ring after heat treatment;

[0020] S8. Perform centerless grinding on the outer ring after double end surface fine grinding;

[0021] S9. Perform outer diameter superfinishing on the outer ring after centerless grinding;

[0022] S10, performing fine grinding on the outer groove of the outer ring after the superfinishing process;

[0023] S11, performing super finishing drawing on the outer ring after the outer groove fine grinding process is completed;

[0024] S12, performing ultrasonic cleaning on the outer ring after the super finishing wire drawing process;

[0025] S13. Inspect the outer diameter and appearance of the cleaned outer ring;

[0026] S14. The outer ring after inspection is subjected to rust prevention treatment and enters a state ready for assembly.

[0027] The aforementioned bearings are machined on the outer surface of the outer ring to form intersecting first and second spiral grooves. Compared to the two parallel grooves on the outer surface of the outer ring of existing bearing products, the intersecting first and second spiral grooves enhance the bonding between the outer surface of the bearing outer ring and the polyurethane material, thereby forming a more stable and secure sleeve structure when the outer surface of the bearing outer ring is wrapped with the polyurethane material sleeve, thereby effectively improving the bearing's load-bearing, noise reduction, and vibration resistance. The bearing outer ring manufacturing method disclosed in this invention utilizes numerical control technology to machine the first and second spiral grooves, significantly improving product yield and processing efficiency, thereby enabling mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the outer ring structure of a bearing in one embodiment;

[0029] Figure 2 for Figure 1 An enlarged structural diagram of part M in the illustrated embodiment;

[0030] Figure 3 for Figure 1 An enlarged structural diagram of part N in the embodiment shown;

[0031] Figure 4 Schematic diagram of the inner ring structure of a bearing in one embodiment;

[0032] Figure 5 for Figure 1 An enlarged structural diagram of part P in the illustrated embodiment;

[0033] Figure 6 FIG. 1 is a schematic partial cross-sectional view of a bearing in one embodiment. DETAILED DESCRIPTION

[0034] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] See also Figure 6 The present invention discloses a bearing comprising an outer ring 1, an inner ring 2, a plurality of balls 3, a retainer 4, and two dust covers 5. The inner sidewall of the outer ring 1 is sleeved onto the outer sidewall of the inner ring 2, and the plurality of balls 3, retainer 4, and two dust covers 5 are disposed between the outer ring 1 and the inner ring 2. The retainer 4 is disposed between the outer ring 1 and the inner ring 2, with the plurality of balls 3 correspondingly disposed within the retainer 4. The two dust covers 5 are disposed on either side of the retainer 4.

[0036] See also Figure 1 The outer ring 1 has a first spiral groove 11 and a second spiral groove 12. Both the first spiral groove 11 and the second spiral groove 12 are located on the outer wall of the outer ring 1. The first spiral groove 11 spirals from the chamfered surface of the first end face 6 of the outer ring 1 toward the second end face 7 of the outer ring. The second spiral groove 12, in contrast to the first spiral groove 11, spirals from the chamfered surface of the second end face 7 of the outer wall of the outer ring 1 toward the first end face 6. The first and second spiral grooves 11 and 12 intersect and are mirror-symmetrical.

[0037] The outer surface of existing bearing outer rings features two parallel grooves, located near the edges of the outer ring near the first and second end faces, respectively. When a polyurethane sleeve is attached, the bond strength between the inner walls of the two parallel grooves and the sleeve is significantly higher than the bond strength between the two parallel grooves on the outer surface of the outer ring. However, in practice, the core contact surface between the bearing and its connecting components lies between the two parallel grooves on the outer ring's outer surface. Therefore, friction generated during operation primarily acts on this core contact surface. Because the bond strength between the polyurethane sleeve and the outer ring's outer surface is relatively weak at this core contact surface, the sleeve can easily detach from the bearing under prolonged friction, affecting normal operation and even causing complete detachment and damage. In comparison, the first spiral groove 11 and the second spiral groove 12 of the present invention are cross-spirally arranged on the outer surface of the outer ring 1, thereby greatly improving the bonding strength between the polyurethane material sleeve and the core contact surface of the outer ring 1. In practical applications, the bearing outer ring 1 of the present invention can not only effectively prevent the polyurethane material sleeve from falling off from the outer surface of the outer ring 1, thereby effectively coping with the axial friction and tangential friction of the outer ring 1, but also can improve the adhesion strength between the outer surface of the outer ring 11 and the polyurethane material, thereby forming a more stable and firm socket structure between the bearing and the polyurethane material sleeve, thereby effectively improving the bearing's load-bearing, noise reduction and vibration resistance.

[0038] See also Figure 1 、 Figure 2 as well as Figure 3 The outer ring 1 has an outer channel 13 , an outer mounting surface 14 and an outer sealing groove 15 . Among them, the outer channel 13 is an annular groove and is arranged along the inner side wall of the outer ring 1 in the middle of the inner side wall. One side surface of several balls 3 is respectively embedded in the outer channel 13 and is in rolling connection with the wall surface of the outer channel 13. In actual application, the outer ring 1 can rotate relative to the inner ring 2 through rolling friction with the several balls 3. The outer mounting surface 14 is two annular mounting surfaces and is arranged on both sides of the outer channel 13 along the inner side wall of the outer ring 1. The side of the retainer 4 away from the geometric center abuts the outer mounting surface 14. The outer sealing groove 15 is two annular grooves and is respectively arranged at the two side edges of the inner side wall of the outer ring 1. The edges of the two dust covers 5 away from the geometric center are embedded in the outer sealing groove 15 and are in sliding connection with the groove wall of the outer sealing groove 15. When the outer ring 1 and the inner ring 2 rotate relative to each other, the two dust covers 5 slide relative to the outer ring 1, thereby avoiding increasing the resistance to the relative rotation of the outer ring 1 and the inner ring 2.

[0039] See also Figure 4The inner ring 2 has an inner channel 21, an inner mounting surface 22, and an inner sealing groove 23. The inner channel 21 is an annular groove and is arranged in the middle of the outer wall of the inner ring 2 corresponding to the outer channel 13. A plurality of balls 3 are respectively embedded in the inner channel 21 on the other side of the outer ring 1 and are in rolling connection with the wall of the inner channel 21. In actual use, the inner ring 2 can rotate relative to the outer ring 1 through rolling friction generated by the balls 3. The inner mounting surface 22 is two annular mounting surfaces and corresponds to the outer mounting surface 14. It is arranged on both sides of the inner channel 21 along the outer wall of the inner ring 2, and the side of the retaining frame 4 close to the geometric center is in contact with the inner mounting surface 22; the inner sealing groove 23 is two annular grooves, and is respectively arranged on the two side edges of the outer wall along the outer wall of the inner ring 2 corresponding to the outer sealing groove 15. The edge of one side close to the geometric center of the two dust covers 5 is embedded in the inner sealing groove 23 and is slidably connected with the groove wall of the inner sealing groove 23. When the outer ring 1 and the inner ring 2 rotate relative to each other, the two dust covers 5 and the inner ring 2 slide relative to each other, thereby avoiding increasing the resistance when the outer ring 1 and the inner ring 2 rotate relative to each other.

[0040] See also Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 as well as Figure 6 The outer groove 13 and the inner groove 21 cooperate to form a groove 101. Several balls 3 are mounted within this groove 101, rolling in contact with each other. The balls 3 enable low-resistance relative rotation between the outer ring 1 and the inner ring 2. The outer mounting surface 14 and the inner mounting surface 22 cooperate to form a mounting interlayer 102. The retainer 4 is mounted within this interlayer 102, and the balls 3 fit within the retainer 4 in a one-to-one correspondence. This retainer 4 reduces the contact area between the balls 3 and the outer ring 1 and inner ring 2 while maintaining their stability. The outer sealing groove 15 and the inner sealing groove 23 cooperate to form a sealing groove 103. Two dust covers 5 are positioned within the sealing groove 103, covering both sides of the retainer 4. This prevents dust or oil from entering the bearing during use, thereby preventing the balls 3 from becoming attached to the bearing and increasing resistance to rotation.

[0041] The present invention also discloses a method for manufacturing the outer ring 1 of a bearing. The method is used to manufacture the outer ring 1 of the bearing, and comprises the following steps:

[0042] S1. Turning the forged bar to obtain a blank of the outer ring 1;

[0043] S2. Rough turning the inner diameter and end face of the outer ring 1 blank;

[0044] S3, turning the outer diameter and the other end face of the outer ring 1 processed in S2;

[0045] S4, performing end surface finish turning on the outer ring 1 processed in S3;

[0046] S5, turning the outer ring 1 processed in S4 to form chamfers, an outer channel 13, an outer sealing groove 15, a first spiral groove 11, and a second spiral groove 12;

[0047] S6. Heat treating the outer ring 1 after machining.

[0048] S7, performing double-end surface rough grinding and fine grinding on the outer ring 1 after the heat treatment;

[0049] S8, performing centerless grinding on the outer ring 1 after the double-end surface fine grinding;

[0050] S9, performing outer diameter superfinishing on the outer ring 1 after centerless grinding;

[0051] S10, performing fine grinding on the outer groove 13 of the outer ring 1 after superfinishing;

[0052] S11, performing super finishing drawing on the outer ring 1 after the outer groove 13 is finished by fine grinding;

[0053] S12, performing ultrasonic cleaning on the outer ring 1 after the super finishing wire drawing process;

[0054] S13, inspecting the outer diameter and appearance of the cleaned outer ring 1;

[0055] S14, performing anti-rust treatment on the outer ring 1 after the inspection, and entering a state ready for assembly.

[0056] In summary, the bearing disclosed in the present invention forms intersecting first and second spiral grooves by machining the outer surface of the outer ring. Compared to the two parallel grooves on the outer surface of the outer ring of existing bearing products, the intersecting first and second spiral grooves can enhance the bonding performance between the outer surface of the bearing outer ring and the polyurethane material, thereby forming a more stable and secure sleeve structure when the outer surface of the bearing outer ring is wrapped with the polyurethane material sleeve, thereby effectively improving the bearing's load-bearing, noise reduction, and vibration resistance. The bearing outer ring manufacturing method disclosed in the present invention uses CNC technology to process the first and second spiral grooves, which can significantly improve product yield and processing efficiency, thereby making mass production possible.

[0057] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A bearing, characterized in that: include: An outer ring, an inner ring, a plurality of balls, a retainer, and two dust covers; the inner side wall of the outer ring is sleeved on the outer side wall of the inner ring, and the plurality of balls, the retainer, and the two dust covers are all arranged between the outer ring and the inner ring; The outer ring has a first spiral groove and a second spiral groove; the first spiral groove and the second spiral groove are both provided on the outer wall surface of the outer ring, wherein the first spiral groove starts from a chamfered surface at one end surface of the outer wall of the outer ring and spirally extends toward the other end surface thereof, and the second spiral groove starts from a chamfered surface at the other end surface of the outer wall of the outer ring relative to the first spiral groove and spirally extends toward the end surface at the starting point of the first spiral groove; the first spiral groove and the second spiral groove intersect and are mirror-symmetrical; The first spiral groove and the second spiral groove are arranged in a cross-spiral manner on the outer surface of the outer ring, and the bonding strength between the polyurethane material sleeve and the contact surface of the outer ring core is improved; The outer ring has an outer channel, an outer sealing groove, and an outer mounting surface; the outer channel is arranged along the inner side wall of the outer ring in the middle of the inner side wall; the outer mounting surface is arranged along the inner side wall of the outer ring on both sides of the outer channel; the outer sealing groove is arranged along the inner side wall of the outer ring at both side edges of the inner side wall; A method for manufacturing an outer ring of a bearing comprises the following steps: S1. Turning the forged bar to obtain a blank of the outer ring; S2. performing rough turning on the inner diameter and end face of the outer ring blank; S3, turning the outer diameter and the other end face of the outer ring processed in S2; S4, performing end surface finish turning on the outer ring processed in S3; S5, turning the outer ring processed in S4 to form chamfers, the outer channel, the outer sealing groove, the first spiral groove, and the second spiral groove; S6, heat treating the outer ring after lathing; S7, performing double-end surface rough grinding and fine grinding on the outer ring after the heat treatment; S8, performing centerless grinding on the outer ring after double-end surface fine grinding; S9, performing outer diameter superfinishing on the outer ring after centerless grinding; S10, performing fine grinding on the outer groove of the outer ring after superfinishing; S11, performing super finishing drawing on the outer ring after the outer groove finish grinding; S12, performing ultrasonic cleaning on the outer ring after the super finishing wire drawing process; S13, inspecting the outer diameter and appearance of the outer ring after cleaning; S14, performing anti-rust treatment on the outer ring after inspection, and entering a state ready for assembly.

2. The bearing according to claim 1, characterized in that The inner ring has an inner channel, an inner sealing groove and an inner mounting surface; the inner channel corresponds to the outer channel and is arranged along the outer wall of the inner ring in the middle of the outer wall; the inner mounting surface corresponds to the outer mounting surface and is arranged along the outer wall of the inner ring on both sides of the inner channel; the inner sealing groove corresponds to the outer sealing groove and is respectively arranged along the outer wall of the inner ring at the two side edges of the outer wall.

3. The bearing according to claim 2, characterized in that The outer mounting surface and the inner mounting surface cooperate with each other to form a mounting interlayer, and the retaining frame is correspondingly mounted in the mounting interlayer.

4. The bearing according to claim 3, characterized in that The outer channel and the inner channel are matched to form a channel, and a plurality of balls are installed in the channel and matched in the retaining frame one by one.

5. The bearing according to claim 4, characterized in that The outer sealing groove and the inner sealing groove cooperate to form a sealing groove, and the two dust covers are respectively arranged in the sealing grooves and cover both sides of the retaining frame.

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