Phosphorization protection device for inner ring raceway and flange of tapered roller bearing
By designing a combined structure of a rubber ring and a throat clamp on the inner ring of the tapered roller bearing, the problem of damage to the raceway and ribs during the phosphating process is solved, efficient phosphating protection is achieved, the process is simplified and costs are reduced.
Patent Information
- Application Number
- CN202422853214.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2034-11-22
AI Technical Summary
The raceways and ribs of high-precision tapered bearings are easily damaged by the phosphating layer during the phosphating process, resulting in changes in surface roughness and profile. Existing technology requires secondary grinding to remove the phosphating layer, increasing costs and cycle time.
A phosphating protective device for the inner ring raceway and rib of a tapered roller bearing is designed. The raceway and rib are sealed with heat-resistant and acid-resistant rubber rings. The combined structure of the rubber ring and the hose clamp prevents the phosphating liquid from contacting the raceway and rib, ensuring normal phosphating of other parts.
The raceway and ribs are protected, the phosphating layer is avoided from being damaged, the process is simplified, the cost is reduced, the high-quality phosphating layer is ensured, and it is suitable for large-scale production.
Smart Images
Figure CN223397803U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of metal surface phosphating treatment, in particular to a phosphating protective device for the inner ring raceway and rib of a tapered roller bearing. Background Art
[0002] In many industries where tapered roller bearings are used, phosphate treatment is required for corrosion protection due to the unique working environments (humidity, salt spray, and rain). However, due to the stringent requirements for the roughness and profile of the raceways and ribs of high-precision tapered bearings, phosphate treatment cannot be performed on these locations. The phosphate layer would severely damage the surface roughness of the raceways and ribs, and even cause profile changes. The most common approach currently used in the bearing industry is to reserve machining allowances in the raceways and ribs before phosphate treatment of the tapered bearing inner ring. The raceways and ribs are then ground to remove the phosphate layer, and finally, a superfinishing process is performed to restore the raceway roughness and profile. While this approach can meet all the process requirements for the bearing inner ring, the secondary grinding process inevitably causes the phosphate layer on the outer surface of the bearing inner ring to be scratched and removed. Furthermore, the addition of at least three additional steps significantly increases processing costs and production cycles. Utility Model Content
[0003] In view of the defects of the background technology and the structural characteristics of the inner ring of a tapered roller bearing, the utility model provides a phosphating protection device for the inner ring of a tapered roller bearing, the raceway and the rib of the inner ring of the tapered roller bearing. When the inner ring of the tapered roller bearing is phosphating, other parts of the inner ring can be phosphated normally while the raceway and the rib can avoid phosphating, thereby ensuring that the outer edge of the rib can be phosphated, forming a clear phosphating boundary.
[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a phosphating protective device for the inner ring raceway and rib of a tapered roller bearing, comprising a rubber ring and a throat clamp; the rubber ring is sleeved on the inner ring raceway of the tapered roller bearing; a convex overhang gap is provided between one end face of the rubber ring and the small rib of the inner ring of the tapered roller bearing; the other end face of the rubber ring contacts the outer edge of the large rib of the inner ring of the tapered roller bearing; the rubber ring is locked by two throat clamps.
[0005] Furthermore, the rubber ring is composed of a raceway fitting surface, a large rib fitting surface, a small rib fitting surface and a locking fitting part in sequence; two upper and lower annular platforms are arranged on the circumferential surface of the locking fitting part; the raceway fitting surface is matched with the inner ring raceway of the tapered roller bearing, and the large rib fitting surface is matched with the large rib of the inner ring.
[0006] Furthermore, a chamfer is provided between the locking fitting portion and the large rib fitting surface; the large rib fitting surface is an irregular plane; the irregular plane is composed of an outer inclined surface and an inner inclined surface; an obtuse angle is formed between the outer inclined surface and the inner inclined surface; the obtuse angle is limited to the range of the large rib of the tapered roller bearing.
[0007] Furthermore, when the throat hoop is not tightened, the outer inclined surface contacts the outer edge of the large rib; when the throat hoop is tightened, the outer inclined surface and the inner inclined surface contact the large rib at the same time, and the outer inclined surface does not exceed the outer edge of the large rib.
[0008] Furthermore, the rubber ring is an integrated molding structure.
[0009] Furthermore, the throat clamp includes a metal ring and a locking buckle; the locking buckle is arranged on the outer surface of the metal ring.
[0010] Furthermore, the throat clamp is sleeved on two annular platforms of the locking fitting part; the plane where the throat clamp contacts the platform of the locking fitting part is a vertical plane; the annular platform close to the small rib is an annular right-angle groove; the two annular platforms and the inner ring of the tapered roller bearing are on the same axis.
[0011] A method for protecting the inner ring raceway and rib of a tapered roller bearing by phosphating includes using the protective device described above. The method includes the following steps:
[0012] a. Calculate the trimmed contact angle between the rubber ring and the outer edge of the large rib;
[0013]
[0014]
[0015] α—Inner ring large rib inclination angle;
[0016] β—inner inclined angle of the end face of the hollow cylindrical part;
[0017] γ—the angle of the outer inclined surface of the end face of the hollow cylindrical part;
[0018] IRHD—rubber hardness;
[0019] C—empirical coefficient;
[0020] b. Calculate the length of the overhang between the rubber ring and the small rib;
[0021]
[0022] H—the overhanging length of the inner edge of the truncated cone;
[0023] L—Width of oil groove on the inner ring small rib.
[0024] Compared with the prior art, the present invention has the following beneficial effects:
[0025] 1. This utility model is designed to meet the needs of shielding and protecting the raceway and ribs of the inner ring of a tapered roller bearing during phosphating. It can phosphate other parts of the inner ring while the raceway and ribs are not phosphated.
[0026] 2. The utility model adopts the method of extrusion expansion of heat-resistant and acid-resistant rubber ring to seal. The overall structure can expand with the temperature to ensure the stability of the seal, prevent the phosphating liquid from penetrating into the raceway and rib, and achieve the purpose of preventing the raceway and rib from being phosphated;
[0027] 3. The utility model does not require any modification of any mechanism of the phosphating equipment. The device can adapt to the phosphating equipment, is easy to install and disassemble, has low manufacturing cost, can adapt to large-scale production, and eliminates the complicated and tedious reverse grinding process;
[0028] 4. The utility model can realize phosphating of the outer edge of the rib, forming a clear boundary between the inner and outer phosphating of the rib, avoiding the defects in the prior art and avoiding secondary processing of the outer edge of the rib after phosphating. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Attachment Figure 1 It is a structural diagram of the utility model;
[0030] Attachment Figure 2 It is a cross-sectional view of the utility model;
[0031] Attachment Figure 3 For attachment Figure 2 A partial enlarged view of point I in the middle;
[0032] Attachment Figure 4 For attachment Figure 2 A partial enlarged view of position II in the middle;
[0033] Attachment Figure 5 This is a schematic structural diagram of the rubber ring of the present utility model;
[0034] Attachment Figure 6 This is a structural diagram of the throat clamp of the present utility model;
[0035] In the figure: 1. rubber ring, 2. inner ring of tapered roller bearing, 3. throat clamp, 4. small rib, 5. large rib, 6. locking fit, 7. raceway fitting surface, 8. right-angle groove, 9. outer inclined surface, 10. inner inclined surface, 11. metal ring, 12. locking buckle, 13. large rib fitting surface, 14. small rib fitting surface. DETAILED DESCRIPTION
[0036] The present invention will be further explained and illustrated below in conjunction with the embodiments and drawings.
[0037] Reference Attachment Figure 1-6 A phosphating protective device for the inner ring raceway and rib of a tapered roller bearing comprises a rubber ring and a throat clamp; the rubber ring is sleeved on the inner ring raceway of the tapered roller bearing; a convex overhang gap is provided between one end face of the rubber ring and the small rib of the inner ring of the tapered roller bearing; the other end face of the rubber ring contacts the outer edge of the large rib of the inner ring of the tapered roller bearing; the rubber ring is locked by two throat clamps.
[0038] It should be noted that the rubber ring is a heat-resistant and acid-resistant rubber sealing ring.
[0039] Furthermore, the rubber ring is composed of a raceway fitting surface, a large rib fitting surface, a small rib fitting surface and a locking fitting part in sequence; two upper and lower annular platforms are arranged on the locking fitting part; the raceway fitting surface fits with the inner ring raceway of the tapered roller bearing, and the large rib fitting surface fits with the large rib of the inner ring.
[0040] Furthermore, a chamfer is provided between the locking fitting portion and the large rib fitting surface; the large rib fitting surface is an irregular plane; the irregular plane is composed of an outer inclined surface and an inner inclined surface; an obtuse angle is formed between the outer inclined surface and the inner inclined surface; the obtuse angle is limited to the range of the large rib of the tapered roller bearing.
[0041] It should be noted that the rubber ring has no contact with the small rib. Since it is necessary to ensure that the small rib is completely phosphated and no part of the small rib is covered, all positions must be exposed. There is a convex gap between one end face of the rubber ring and the small rib of the inner ring of the tapered roller bearing, so it is necessary to calculate a distance longer than the covered position (see the following method steps for the calculation formula).
[0042] Furthermore, when the throat hoop is not tightened, the outer inclined surface contacts the outer edge of the large rib; when the throat hoop is tightened, the outer inclined surface and the inner inclined surface contact the large rib at the same time, and the outer inclined surface does not exceed the outer edge of the large rib.
[0043] It should be noted that when the throat clamp is tightened, due to the material pressure support of the rubber ring and the calculation of the trimming angle, the outer inclined surface will not produce a reverse wrapping on the outer edge of the large rib and affect the phosphating effect.
[0044] Furthermore, the rubber ring is an integrated molding structure.
[0045] Furthermore, the throat clamp includes a metal ring and a locking buckle; the locking buckle is arranged on the outer surface of the metal ring.
[0046] Furthermore, the throat clamp is sleeved on two annular platforms of the locking fitting part; the plane where the throat clamp contacts the platform of the locking fitting part is a vertical plane; the annular platform close to the small rib is an annular right-angle groove; the two annular platforms and the inner ring of the tapered roller bearing are on the same axis.
[0047] It should be noted that after the two throat hoops are installed, a protective cover can be placed outside the throat hoops to prevent the throat hoops from being corroded during phosphating. The throat hoops can then be used repeatedly, avoiding waste of resources and saving costs.
[0048] A method for protecting the inner ring raceway and rib of a tapered roller bearing by phosphating includes using the protective device described above. The method includes the following steps:
[0049] Before phosphating, the rubber ring is put on the inner ring raceway, and the two throat clamps are respectively put on the upper and lower annular platforms of the locking fit part of the rubber ring. When the throat clamp is tightened, the rubber ring generates a force toward both ends by squeezing, so that the rubber ring just contacts the outer edges of the large and small ribs, does not cover the outer edges of the large and small ribs, and generates appropriate contact pressure on the raceway and the large rib surface. The utility model requires that the rubber ring covers and seals the entire raceway and the large rib surface, so that the bearing inner ring raceway and the large rib surface are well sealed and protected. During phosphating, other parts of the inner ring can be phosphated while the raceway and the large rib parts avoid phosphating and obtain a higher quality boundary.
[0050] a. Calculate the trimmed contact angle between the rubber ring and the outer edge of the large rib;
[0051]
[0052]
[0053] α—Inner ring large rib inclination angle;
[0054] β—inner inclined angle of the end face of the hollow cylindrical part;
[0055] γ—the angle of the outer inclined surface of the end face of the hollow cylindrical part;
[0056] IRHD—rubber hardness;
[0057] C—empirical coefficient;
[0058] b. Calculate the length of the overhang between the rubber ring and the small rib;
[0059]
[0060] H—the overhanging length of the inner edge of the truncated cone;
[0061] L—Width of oil groove on the inner ring small rib.
[0062] Note: The overhang length is the length pressed onto the oil groove. A shorter overhang length will affect the phosphating shielding performance. A longer overhang length will produce a reverse wrapping effect, affecting the phosphating of the outer edge of the small rib.
[0063] It should be noted that the utility model includes 1 rubber ring and 2 throat clamps. The device needs to calculate the rubber ring structure and size that conforms to the rubber expansion characteristics according to the specific size of the inner ring of the tapered bearing, and select the appropriate rubber material according to the size range of the inner ring of the tapered bearing. Then, the stainless steel throat clamp specification is selected according to the designed outer diameter of the rubber ring. During phosphating, the large end of the rubber ring is inserted from the outer diameter of the small end of the inner ring of the tapered bearing, so that the rubber ring fits tightly with the large rib of the inner ring of the tapered bearing. Two throat clamps are used to lock the upper and lower positions of the rubber ring, so that the rubber ring fits tightly with the raceway and the large rib and is isolated from the outside world. During phosphating, other parts of the inner ring can be phosphated normally, while the raceway and the large rib are prevented from phosphating.
[0064] After determining the material of the rubber ring, the contact angle of the rubber ring needs to be calculated based on the compressive expansion performance of the rubber material and the rib angle of the tapered bearing inner ring. The calculation result is the key dimension that directly determines whether the rib will leak during the phosphating process.
[0065] The material selection of the rubber ring takes into account that the phosphating working temperature is between 20℃ and 95℃ and it can withstand the acidic environment. The tightening torque of the throat clamp is calculated based on the expansion of the inner ring of the tapered bearing at this temperature and the expansion characteristics of the rubber ring to ensure that the rubber ring is tightly sealed with the inner ring raceway and large rib of the tapered bearing, ensuring that good shielding performance can be obtained in the protected area during phosphating.
[0066] In addition, the rubber ring is composed of a frustum and a hollow cylindrical portion in sequence; an annular right-angle groove is provided on the outer circumferential surface of the frustum near the upper bottom surface; the outer diameter of the lower bottom surface of the frustum is equal to the outer diameter of the hollow cylindrical portion; the inner wall of the cavity formed by the hollow cylindrical portion and the frustum is matched with the raceway of the inner ring of the tapered roller bearing; one of the throat clamps is sleeved in the annular right-angle groove; the plane in contact with the annular right-angle groove is a vertical plane; the annular right-angle groove and the inner ring of the tapered roller bearing are on the same axis; one of the throat clamps is sleeved on the outer surface of the hollow cylindrical portion.
[0067] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.
Claims
1. A phosphating protective device for the inner ring raceway and rib of a tapered roller bearing, characterized by: It includes a rubber ring and a throat clamp; the rubber ring is sleeved on the raceway of the inner ring of the tapered roller bearing; a convex gap is provided between one end face of the rubber ring and the small rib of the inner ring of the tapered roller bearing; the other end face of the rubber ring contacts the outer edge of the large rib of the inner ring of the tapered roller bearing; the rubber ring is locked by the two throat clamps.
2. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 1, characterized in that: The rubber ring is composed of a raceway mating surface, a large rib mating surface, a small rib mating surface and a locking mating part in sequence; two annular platforms are arranged above and below the circumferential surface of the locking mating part; the raceway mating surface is matched with the raceway of the inner ring of the tapered roller bearing; the large rib mating surface is matched with the large rib of the inner ring of the tapered roller bearing.
3. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 2, characterized in that: A chamfer is set between the locking fit portion and the large rib fitting surface; the large rib fitting surface is an irregular plane; the irregular plane consists of an outer inclined surface and an inner inclined surface; an obtuse angle is formed between the outer inclined surface and the inner inclined surface; the obtuse angle is limited to the large rib range of the tapered roller bearing.
4. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 3, characterized in that: When the throat hoop is not tightened, the outer inclined surface contacts the outer edge of the large rib; when the throat hoop is tightened, the outer inclined surface and the inner inclined surface contact the large rib at the same time, and the outer inclined surface does not exceed the outer edge of the large rib.
5. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 2, characterized in that: The rubber ring is an integrated molding structure.
6. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 1, characterized in that: The throat clamp comprises a metal ring and a locking buckle; the locking buckle is arranged on the outer surface of the metal ring.
7. The phosphating protective device for the inner ring raceway and rib of a tapered roller bearing according to claim 2, characterized in that: The throat clamp is mounted on two annular platforms at the locking fitting part; the plane where the throat clamp contacts the platform of the locking fitting part is a vertical plane; the annular platform close to the small rib is an annular right-angle groove; the two annular platforms and the inner ring of the tapered roller bearing are on the same axis.