Phosphating protection device and method for inner ring raceway and flange of tapered roller bearing

Abstract

The invention relates to the field of metal surface phosphating treatment, in particular to a tapered roller bearing inner ring raceway and flange phosphating protection device and method, and the tapered roller bearing inner ring raceway and flange phosphating protection device comprises a rubber ring and a hose clamp; the rubber ring is sleeved on an inner ring raceway of the tapered roller bearing; a convex suspension gap is formed between one end surface of the rubber ring and the small flange of the inner ring of the tapered roller bearing; the other end face of the rubber ring is in contact with the outer edge of the large flange of the inner ring of the tapered roller bearing; and the rubber ring is locked through the two hose clamps. According to the invention, other parts of the inner ring can be normally phosphatized, and the roller path and the flange part are prevented from being phosphatized, so that the outer edge of the flange can be phosphatized, and a clear phosphatization limit is formed.

Description

Technical Field

[0001] The invention relates to the field of metal surface phosphating treatment, and in particular to a phosphating protection device and method for an inner ring raceway and a rib of a tapered roller bearing. Background Art

[0002] In many industries where tapered roller bearings are used, the bearings must be phosphated for corrosion protection due to the particularity of the working environment (humidity, salt spray, rain). However, due to the high requirements for the roughness and contour of the raceway and flange of high-precision tapered bearings, these positions cannot be phosphated. The phosphating layer will seriously damage the surface roughness of the raceway and flange and even cause the profile to change. The solution currently adopted by the vast majority of the bearing industry is to reserve machining allowances in advance at the raceway and flange positions, then perform overall phosphating treatment on the inner ring of the tapered bearing, then grind the raceway and flange positions to remove the phosphating layer, and finally restore the roughness and contour of the raceway through the super-finishing process. Although this solution can meet the various process requirements of the inner ring of the bearing, it will inevitably cause the phosphating layer on the outer surface of the inner ring of the bearing to be scratched and fall off during the secondary grinding process, and at least 3 additional processes have been added, resulting in a significant increase in processing costs and production cycles. Summary of the invention

[0003] In view of the defects of the background technology and the structural characteristics of the inner ring of a tapered roller bearing, the present invention provides a phosphating protection device and method 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 phosphated, 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 to form 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 the two throat clamps.

[0005] Furthermore, 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 upper and lower annular platforms are arranged on the circumferential surface of the locking mating part; the raceway mating surface fits with the inner ring raceway of the tapered roller bearing, and the large rib mating surface fits with the large rib of the inner ring.

[0006] Furthermore, a chamfer is arranged 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 comprises 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] The phosphating protection method for the inner ring raceway and rib of a tapered roller bearing includes using the protective device, and the method includes the following steps: a. Calculate the trimmed contact angle between the rubber ring and the outer edge of the large rib;

[0012]

[0013] α—Inner ring large rib inclination angle; β—inner inclined angle of the end face of the hollow cylindrical body; γ—Angle of the outer inclined surface of the end face of the hollow cylindrical body; IRHD—rubber hardness; C—empirical coefficient; b. Calculate the length of the gap between the rubber ring and the small rib;

[0014] H—the protruding length of the inner edge of the truncated cone; L—Width of oil groove on the inner ring small rib.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention 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, and can phosphate other parts of the inner ring while the raceway and ribs are not phosphated; 2. The present invention adopts the method of sealing by extrusion expansion of heat-resistant and acid-resistant rubber rings. The overall structure can expand with the temperature to ensure the stability of the seal, and prevent the phosphating liquid from penetrating into the raceway and the rib, so as to achieve the purpose of preventing the raceway and the rib from being phosphated; 3. The present invention 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 cumbersome reverse grinding process; 4. The present invention can achieve phosphating of the outer edge of the flange, forming a clear boundary between the inner and outer phosphating of the flange, avoiding the defects in the prior art and avoiding secondary processing of the outer edge of the flange after phosphating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 It is a structural schematic diagram of the present invention; Attached Figure 2 is a cross-sectional view of the present invention; Attached Figure 3 For attachment Figure 2 The local enlarged view of point I in the middle; Attached Figure 4 For attachment Figure 2 A partial enlarged view of position II in the middle; Attached Figure 5 It is a schematic structural diagram of the rubber ring of the present invention; Attached Figure 6 It is a structural schematic diagram of the throat hoop of the present invention; 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 part, 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

[0017] The present invention will be further explained and illustrated below in conjunction with embodiments and drawings.

[0018] Reference Figure 1-6 The 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.

[0019] It should be noted that the rubber ring is a heat-resistant and acid-resistant rubber sealing ring.

[0020] Furthermore, the rubber ring is composed of a raceway mating surface, a large rib mating surface, a small rib mating surface and a locking mating portion in sequence; two upper and lower annular platforms are arranged on the locking mating portion; the raceway mating surface fits with the inner ring raceway of the tapered roller bearing, and the large rib mating surface fits with the large rib of the inner ring.

[0021] Furthermore, a chamfer is arranged 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.

[0022] 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, and it is necessary to calculate the distance longer than the covered position (please refer to the following method steps for the calculation formula).

[0023] 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.

[0024] 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 wrap on the outer edge of the large rib and affect the phosphating effect.

[0025] Furthermore, the rubber ring is an integrated molding structure.

[0026] Furthermore, the throat clamp comprises a metal ring and a locking buckle; the locking buckle is arranged on the outer surface of the metal ring.

[0027] 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.

[0028] It should be noted that after the two throat hoops are installed, a protective sleeve can be put on the outside of the throat hoops to prevent the throat hoops from being corroded during phosphating, and the throat hoops can be used repeatedly to avoid waste of resources and save costs.

[0029] The phosphating protection method for the inner ring raceway and rib of a tapered roller bearing includes using the protective device, and the method includes the following steps: Before phosphating, the rubber ring is put on the inner ring raceway, and the two throat hoops are respectively put on the upper and lower annular platforms of the locking fitting part of the rubber ring. When the throat hoop is tightened, the rubber ring generates a force toward both ends through extrusion, so that the rubber ring just contacts with 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 present invention 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.

[0030] a. Calculate the trimmed contact angle between the rubber ring and the outer edge of the large rib;

[0031]

[0032] α—Inner ring large rib inclination angle; β—inner inclined angle of the end face of the hollow cylindrical body; γ—Angle of the outer inclined surface of the end face of the hollow cylindrical body; IRHD—rubber hardness; C—empirical coefficient; b. Calculate the length of the gap between the rubber ring and the small rib;

[0033] H—the protruding length of the inner edge of the truncated cone; L—Width of oil groove on the inner ring small rib.

[0034] Note: The overhang length is the length pressed onto the oil groove. A shorter overhang length will affect the phosphating shielding, while a longer overhang length will produce a reverse wrapping effect, affecting the phosphating of the outer edge of the small rib.

[0035] It should be noted that the present invention includes 1 rubber ring and 2 throat hoops. The device needs to calculate the rubber ring structure and size that meet the rubber expansion characteristics according to the specific size of the inner ring of the tapered bearing, and select a suitable rubber material according to the size range of the inner ring of the tapered bearing. Then, the stainless steel throat hoop 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 hoops 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.

[0036] After determining the material of the rubber ring, it is necessary to calculate the contact angle of the rubber ring based on the compressive expansion performance of the rubber material and the rib angle of the inner ring of the tapered bearing. The calculation result is the key dimension, which directly determines whether the rib will leak during the phosphating process.

[0037] 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.

[0038] In addition, the rubber ring is composed of a truncated cone portion and a hollow cylindrical portion in sequence; an annular right-angle groove is arranged on the outer circumferential surface of the truncated cone portion near the upper bottom surface; the outer diameter of the lower bottom surface of the truncated cone portion 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 truncated cone portion fits with the raceway of the inner ring of the tapered roller bearing; one of the throat clamps is arranged 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 arranged on the outer surface of the hollow cylindrical portion.

[0039] 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 familiar with 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 a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. The phosphating protection device for the inner ring raceway and rib of the tapered roller bearing is characterized by: It comprises 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 hanging 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.

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 arranged 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 within the range of the large rib 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 is 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 protection device for the inner ring raceway and rib of a tapered roller bearing according to claim 2 is characterized in that: The rubber ring is an integrated molding structure.

6. The phosphating protection device for the inner ring raceway and rib of a tapered roller bearing according to claim 1 is characterized in that: The throat hoop comprises a metal ring and a locking buckle; the locking buckle is arranged on the outer surface of the metal ring.

7. The phosphating protection device for the inner ring raceway and rib of a tapered roller bearing according to claim 2 is characterized in that: 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.

8. A tapered roller bearing inner ring rolling and rib phosphating protection method, comprising using the protection device according to any one of claims 1 to 7, the method comprising the following steps: a. Calculate the trimmed contact angle between the rubber ring and the outer edge of the large rib; ； ； α—Inner ring large rib inclination angle; β—inner inclined surface angle of the end surface of the hollow cylindrical body; γ—Angle of the outer inclined surface of the end face of the hollow cylindrical body; IRHD—rubber hardness; C—empirical coefficient; b. Calculate the length of the gap between the rubber ring and the small rib; ； H—the protruding length of the inner edge of the truncated cone; L—Width of oil groove on the inner ring small rib.

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