Method for controlling axial play of a combined bidirectional thrust angular contact bearing

Abstract

The present application relates to a combined bidirectional thrust angular contact bearing axial play control method, comprising: axial play existence control and axial play amount qualified control; the axial play existence control is formed by upper and lower settings of bearing horizontal placement forming combined outer ring, whether there is a gap between the two outer ring combined surfaces is obtained by rotating the upper outer ring; the axial play amount qualified control is: theoretically calculating the axial distance between the two raceway groove bottoms of the combined outer ring, then taking the two outer ring combined surfaces as the reference, respectively measuring the axial distance between the combined surface and the respective raceway groove bottom, obtaining the actual distance between the combined outer rings, so that the axial play exists and is qualified; the present application can well solve the axial play control problem of such special-shaped bearings and accumulate the control experience of bearing axial play.

Description

TECHNICAL FIELD

[0001] The present application relates to the detection control of bearing clearance, in particular to a combined bidirectional thrust angular contact bearing axial clearance control method, belonging to the technical field of bearing measurement. BACKGROUND

[0002] For the special-shaped combined bidirectional thrust angular contact ball bearing, since the bearing is independently developed, the structure is special (such as shown in the figure), the combined outer ring forms the whole outer ring of the bearing, and the inner assembly is located between the combined outer rings; therefore, there is no experience in the axial clearance control of the bearing, and it is impossible to ensure that the axial clearance of the bearing after the combination of each part meets the drawing requirements at one time. Figure 1 SUMMARY

[0003] In view of the lack of experience in the axial clearance control of the above-mentioned special-shaped bearing, after continuous exploration and summary in processing, a combined bidirectional thrust angular contact bearing axial clearance control method is proposed, so as to ensure that the axial clearance of each part is 100% qualified at one time.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is: a combined bidirectional thrust angular contact bearing axial clearance control method, comprising: axial clearance existence control and axial clearance amount qualified control;

[0005] The axial clearance existence control is achieved by arranging the upper and lower of the combined outer ring when the bearing is horizontally placed, and by rotating the upper outer ring to obtain whether there is a gap between the two combined surfaces of the outer ring; the axial clearance amount qualified control is: theoretically calculating the axial distance between the two raceway groove bottoms of the combined outer ring, and then measuring the axial distance between the combined surface and the respective raceway groove bottom with the two combined surfaces as the reference, to obtain the actual distance between the combined outer rings, so that the axial clearance exists and is qualified;

[0006] The combined bidirectional thrust angular contact bearing disclosed by the present application comprises: a semi-enclosed combined outer ring, the combined outer ring comprises an internal cavity formed by a first outer ring and a second outer ring, the opposite inner surfaces of the first outer ring and the second outer ring are respectively provided with raceways matched with steel balls, and a double-raceway inner ring is arranged in the cavity between the first outer ring and the second outer ring, the double raceways of the inner ring are respectively matched with the raceways of the first outer ring and the second outer ring to form a double-row angular contact bearing.

[0007] ​The first outer ring is an L-shaped structure with a large end face at one end and a small end face at the other end; the inner side of one end of the second outer ring is provided with a raceway, and the other end is a flange face, and the side close to the raceway has a stop edge structure, and the height of the stop edge plane is higher than the height of the flange face on the other side of the raceway; the small end face of the first outer ring faces the flange face of the second outer ring; the first outer ring and the second outer ring are combined together to form a whole outer ring, and the inner ring and the steel ball exist axial movement in the whole outer ring, and the axial movement amount is the axial play of the combined bearing.

[0008] Further, the specific steps for controlling the existence of the axial play are:

[0009] After assembling the first outer ring, the inner ring, the second outer ring and the steel ball of the bearing, the bearing assembly is placed horizontally, the bottom surface of the second outer ring faces downward and is fixed through a fulcrum, and the first outer ring is rotated; if the first outer ring rotates flexibly, the small end face of the first outer ring and the flange face of the second outer ring are not in contact, and there is a gap; the gap amount h is measured by using a plug gauge;

[0010] Further, the specific steps for controlling the existence of the axial play are:

[0011] When the gap amount h between the small end face of the first outer ring and the flange face of the second outer ring is controlled at about 0.02mm, the control method is as follows,

[0012] (1) Theoretically calculate the axial distance H between the raceway groove bottom of the inner ring and the second outer ring;

[0013] (2) Assemble and horizontally place the first outer ring, the inner ring and one row of steel balls, fix the bottom surface of the first outer ring, so that the inner ring is in a sinking state, after rotating for one week, measure the distance H1 between the end face of the first outer ring and the raceway groove bottom of the inner ring;

[0014] (3) Theoretically calculate the distance H2 between the flange face of the second outer ring and the raceway groove bottom, at this time the axial play is 0; H2=H-H1;

[0015] (4) In order to ensure the existence of the axial play, the actual distance H2' between the flange face of the second outer ring and the raceway groove bottom is H2+axial play;

[0016] (5) Horizontally place the second outer ring on the platform, measure the actual distance between the flange face of the second outer ring and the raceway groove bottom, and ensure that the measured value is equal to H2'.

[0017] The calculation principle of the axial distance H of the step (1) is that the centers of the second outer ring, the inner ring and the steel ball raceway are all on the contact angle line, when the axial play is 0, the steel ball and the raceway point coincide at the contact point position, the distance between the centers of the steel ball and the second outer ring and the inner ring is theoretically calculated, OA=R21-Rsteel ball, OB=R02-Rsteel ball;

[0018] In triangle AFO, ∠OAF=θ, calculate OF=OA*sinθ

[0019] In triangle OB'B, ∠B'BO=θ, calculate OB'=OB*sinθ

[0020] OE=B'E-OB'B'E≈BE=R02

[0021] OE=BE-OB*sinθ=R02-(R02-Rball)*sinθ

[0022] OD=FD-OF FD≈AD=R21

[0023] OD=AD-AO*sinθ=R21-(R21-Rball)*sinθ H=OE+OD=R02-(R02-Rball)*sinθ+R21-(R21-Rball)*sinθ=R02+R21-R02*sinθ-R21*sinθ+2*Rball*sinθ

[0024] Wherein, R01 refers to the first outer ring raceway radius; R02 refers to the inner ring raceway radius; R21 refers to the second outer ring raceway radius; Rball refers to the steel ball radius.

[0025] The technical key point of the application is that the axial distance between the inner ring and the second outer ring raceway groove bottom is theoretically calculated, the combined surface of the first outer ring and the second outer ring is taken as the medium, and the axial distance between the combined surface and the raceway groove bottom of each is measured respectively, so that the axial clearance exists and is qualified, the first-time success rate is guaranteed to reach 100%, and the axial clearance control problem of the special-shaped bearing is well solved, and the control experience of the bearing axial clearance is accumulated. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural diagram of the combined bidirectional thrust angular contact bearing of the application.

[0027] Figure 2 It is a control structure diagram of the bearing axial clearance.

[0028] Figure 3 It is a structure diagram of the axial distance H between the inner ring and the second outer ring raceway groove bottom of the bearing.

[0029] Figure 4 It is a structure diagram of the axial distance H between the inner ring and the second outer ring raceway groove bottom of the bearing. Figure 3 It is a structure diagram of the axial distance H between the inner ring and the second outer ring raceway groove bottom of the bearing.

[0030] Figure 5 It is a structure diagram of the distance H1 between the first outer ring small end surface and the inner ring raceway groove bottom.

[0031] Figure 6 It is a structure diagram of the actual distance between the second outer ring flange surface and the raceway groove bottom.

[0032] In the diagram, 01 is the first outer ring, 02 is the inner ring, 21 is the second outer ring, 04 is the steel ball, θ is the contact angle, and 21-1 is the flange face of the second outer ring. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Example

[0035] like Figures 2-6 The pair shown Figure 1 The combined bidirectional thrust angular contact bearing axial clearance control method includes: controlling the existence of axial clearance and controlling the qualified amount of axial clearance.

[0036] like Figure 1 As shown, the combined bidirectional thrust angular contact bearing includes: a semi-enclosed combined outer ring, wherein the combined outer ring is formed by a first outer ring 01 and a second outer ring 21 forming an internal cavity, and the inner surfaces of the first outer ring 01 and the second outer ring 21 are respectively provided with raceways that mate with steel balls 04. A double-raceway inner ring 02 is provided in the cavity between the first outer ring 01 and the second outer ring 21, and the double raceways of the inner ring 02 mate with the raceways of the first outer ring 01 and the second outer ring 21 to form a double-row angular contact bearing;

[0037] The first outer ring 01 has an L-shaped cross-section with a large end face at one end and a small end face at the other end; the second outer ring 21 has a raceway on the inner side of one end and a flange face 21-1 at the other end, with a retaining edge structure on the side near the raceway, and the height of the retaining edge plane is higher than the height of the flange face on the other side of the raceway; the small end face of the first outer ring 01 faces the flange face 21-1 of the second outer ring.

[0038] Methods for controlling bearing axial clearance:

[0039] After assembling the first outer ring 01, inner ring 02, second outer ring 21, and steel balls 04 according to the bearing structure, place the bearing assembly horizontally with the bottom surface of the second outer ring 21 facing down and fixed by a fulcrum. Rotate the first outer ring 01. If the first outer ring 01 rotates freely, there is no contact between the small end face of the first outer ring 01 and the flange face 21-1 of the second outer ring, indicating a gap. The gap amount h is measured using a feeler gauge. Figure 2 As shown;

[0040] Methods for controlling the axial clearance of bearings to meet standards:

[0041] When the gap amount h is controlled at about 0.02mm, the axial distance H between the inner ring 02 and the second outer ring raceway groove bottom 21 can be theoretically calculated as shown in Figure 3 According to the principle of the axial distance H as shown in Figure 4 The following can be calculated:

[0042] R02: 2.92 R21: 2.86 Steel ball diameter 5.556 Rsteel ball: 2.778 θ: 60° Theoretically calculated H:

[0043] H = R02 + R21 - R02 * sin θ - R21 * sin θ + 2 * Rsteel ball * sin θ

[0044] = 2.92 + 2.86 - 2.92 * sin 60° - 2.86 * sin 60° + 5.556 * sin 60°

[0045] = 5.78 - 2.528 - 2.477 + 4.812

[0046] = 5.587mm.

[0047] The distance H1 between the first outer ring 01 end face and the inner ring 02 raceway groove bottom is measured as shown in Figure 5 The value of H1 is 4.70mm.

[0048] The distance H2 between the second outer ring flange face 21-1 and the raceway groove bottom is theoretically calculated when the axial clearance is 0; H2 = H - H1; when the axial clearance is 0, H2 = H - H1 = 5.587 - 4.70 = 0.887mm. To ensure the existence of the axial clearance, the actual distance H2' between the second outer ring flange face 21-1 and the raceway groove bottom = H2 + axial clearance as shown in Figure 6 If the axial clearance is 0.01-0.02mm, the distance H2' between the second outer ring flange face 21-1 and the raceway groove bottom = H2 + (0.01-0.02) = 0.897-0.907mm.

Claims

1. A method of axial play control for a combined bidirectional thrust angular contact bearing, characterized in that, include: Control of axial clearance and control of axial clearance amount to ensure it meets requirements; The control of the axial clearance is achieved by placing the bearing horizontally to form the upper and lower configuration of the combined outer rings, and rotating the upper outer ring to determine whether there is a gap between the two outer ring assembly surfaces. The control of the qualified axial clearance is achieved by theoretically calculating the axial distance between the bottom of the two raceway grooves of the combined outer rings, and then, using the two outer ring assembly surfaces as a reference, measuring the axial distance from the assembly surface to the bottom of each raceway groove to obtain the actual distance between the combined outer rings, thus ensuring that the axial clearance exists and is qualified. The combined double-direction thrust angular contact bearing includes: a semi-enclosed combined outer ring, wherein the combined outer ring is composed of a first outer ring and a second outer ring forming an internal cavity; the inner surfaces of the first outer ring and the second outer ring are respectively provided with raceways that mate with steel balls; a double-raceway inner ring is arranged in the cavity between the first outer ring and the second outer ring; the double raceways of the inner ring mate with the raceways of the first outer ring and the second outer ring respectively to form a double-row angular contact bearing; the first outer ring has an L-shaped cross-section with one end being a large end face and the other end being a small end face; a raceway is provided on the inner side of one end of the second outer ring, and the other end is a flange face; the small end face of the first outer ring faces the flange face of the second outer ring; the first outer ring and the second outer ring are combined together to form an integral outer ring; The specific steps for controlling the axial clearance are as follows: After assembling the first outer ring, inner ring, second outer ring, and steel balls of the bearing, place the bearing assembly horizontally with the bottom surface of the second outer ring facing down and fix it with a fulcrum. Rotate the first outer ring. If the first outer ring rotates flexibly, there is no contact between the small end face of the first outer ring and the flange face of the second outer ring, and there is a gap. The gap h is measured with a feeler gauge. The specific steps for controlling the axial clearance to be within acceptable limits are as follows: When the clearance h between the small end face of the first outer ring and the flange face of the second outer ring is controlled within 0.01-0.02mm, the control method is as follows: (1) Theoretical calculation of the axial distance H between the bottom of the inner and outer raceway grooves; (2) Assemble the first outer ring, the inner ring and one row of steel balls and place them horizontally. Fix the bottom surface of the first outer ring and make the inner ring sink. After rotating one revolution, measure the distance H1 between the end face of the first outer ring and the bottom of the inner ring raceway groove. (3) Theoretically calculate the distance H2 between the second outer ring flange face and the bottom of the raceway groove. At this time, the axial clearance is 0; H2 = H - H1; (4) To ensure the existence of axial clearance, the actual distance H2' between the second outer ring flange face and the bottom of the raceway groove is H2 + axial clearance; (5) Place the second outer ring horizontally on the platform and measure the actual distance between the flange face of the second outer ring and the bottom of the raceway groove, ensuring that the measured value is equal to H2'.

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