CN102312925A - A method for fixing a thrust bearing ring - Google Patents

Abstract

The invention relates to a fixing method of a thrust bearing ring, which is suitable for fixing the thrust bearing ring on a bearing seat in a precision rotating shaft system. The problem to be solved is that the thrust bearing ring can be fixed on the bearing seat made of materials with different expansion coefficients, and the mutual influence caused by mutual deformation is small when the ambient temperature changes, so as to ensure the accuracy of the rotating shaft system. In the present invention, the thrust bearing ring is positioned on the mounting surface of the bearing seat through three radial positioning blocks; a compression sleeve is embedded in a plurality of through holes uniformly distributed along the circumference of the thrust bearing ring in the radial direction, and through The screws inserted into the compression sleeve limit the thrust bearing ring in the axial direction, so that the connection surface of the thrust bearing ring and the mounting surface of the bearing seat just fit together. There is a gap between the radial positioning block, the compression sleeve and the thrust bearing ring, so that the thrust bearing ring can freely expand and contract when the temperature changes.

Description

A method for fixing a thrust bearing ring

technical field

The invention relates to a fixing method of a thrust bearing ring in a rotating shaft system, in particular to a fixing method of a thrust bearing ring.

Background technique

In order to ensure the rotation accuracy of the vertical shaft system of the photoelectric theodolite, there is a high precision requirement for the flatness of the raceway surface of the thrust bearing ring in the shaft system. Generally, the thrust bearing ring is fixed on the cast iron or cast steel bearing seat. Since the expansion coefficients of the thrust bearing ring and the bearing seat are basically the same, the impact on the thrust bearing ring is small when the ambient temperature changes. In order to reduce the weight of the equipment, the material of the bearing housing is cast aluminum. In this way, the thrust bearing ring is fixed on a material whose expansion coefficient is inconsistent with the thrust bearing ring. When the ambient temperature changes greatly, due to the thrust bearing ring Inconsistent with the deformation of the bearing seat, the thrust bearing ring is deformed, which affects the rotation accuracy of the shaft system, and then affects the measurement accuracy of the photoelectric theodolite.

Contents of the invention

The object of the present invention is to provide a fixing method for a thrust bearing ring, which is used to fix the thrust bearing ring on a bearing seat made of a material with a different expansion coefficient from that of the thrust bearing ring. When the ambient temperature changes, The deformation of the thrust bearing ring is small due to the inconsistent deformation of the thrust bearing ring and the bearing seat, so that the rotating shaft system has lower temperature sensitivity.

A method for fixing a thrust bearing ring provided by the present invention uses three radial positioning blocks to radially position the thrust bearing ring on the mounting surface of the bearing housing; The compression sleeve is embedded in multiple through holes, and the thrust bearing ring is limited in the axial direction by the screw inserted into the compression sleeve, so that the connection surface of the thrust bearing ring and the installation surface of the bearing seat just fit; There is a gap between the positioning block and the compression sleeve and the thrust bearing ring, so that the thrust bearing ring can expand and contract freely when the temperature changes.

In the thrust bearing ring, three evenly distributed slots are formed in the circumferential direction, the slots have two sides parallel to each other, and the slotting direction is along the radial direction of the thrust bearing ring; evenly distributed on the circumference of a certain radius Multiple vias.

On the two sides of the radial positioning block in contact with the groove of the thrust bearing ring, the clearance is guaranteed to be 0.002-0.004mm; there is an appropriate amount of clearance in the radial direction of the thrust bearing ring, and when the ambient temperature changes, the diameter The positioning block does not interfere with the thrust bearing ring.

In the above-mentioned compression sleeve, there is an appropriate amount of clearance between the through hole of the thrust bearing ring in the diameter direction, and when the ambient temperature changes, the compression sleeve does not interfere with the through hole of the thrust bearing ring; The length of the through hole of the thrust bearing ring is 0.01-0.02mm, so that after the screw is pre-tightened, the connecting surface of the thrust bearing ring and the installation surface of the bearing seat just fit together.

The flatness of the connection surface of the thrust bearing ring and the installation surface of the bearing seat is less than 0.01mm.

The method for fixing the thrust bearing ring of the present invention has the following advantages: 1) the structure is simple and reliable, and the implementation is convenient; 2) the thrust bearing ring can be fixed on a bearing housing made of a material with a different expansion coefficient from the thrust bearing ring, Moreover, when the ambient temperature changes, the mutual influence caused by mutual deformation is small, ensuring the precision of the rotating shaft system, and making the rotating shaft system have lower temperature sensitivity.

Description of drawings

Fig. 1 is a front view of the structure formed when the fixing method of a thrust bearing ring of the present invention is completed;

Figure 2 is a partially enlarged view of Figure 1;

Fig. 3 is the structural diagram of the thrust bearing ring among the present invention;

Fig. 4 is the structural diagram of the radial positioning block among the present invention;

Fig. 5 is a structural diagram of the compression sleeve in the present invention.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, 1 is the bearing seat, 2 is the thrust bearing ring, 3 is the ordinary cylindrical pin, 4 is the spring washer, 5 is the hexagon socket head screw (M4), 6 is the radial positioning block, and 7 is the Compression sleeve, 8 are hexagon socket head cap screws (M8), and 9 are flat washers.

Put the thrust bearing ring 2 on the mounting surface of the bearing seat 1, put the spring washer 4 on the radial positioning block 6, and install the radial positioning block 6 on the bearing seat 1 with the hexagon socket head cap screw (M4) 5 On the top, the thickness between the two sides of the radial positioning block 6 is matched, and the two sides of the radial positioning block 6 are in contact with the grooved sides of the thrust bearing ring 2 to ensure that the radial positioning block 6 and the thrust bearing ring 2 are slotted The gap between the contact surfaces on both sides of the contact is 0.002 ~ 0.004mm, and there is a gap L1 in the radial direction between the radial positioning block 6 and the thrust bearing ring 2; put the compression sleeve 7 into the through hole of the thrust bearing ring 2 Inside, there is a gap L2 between the outer circle of the compression sleeve 7 and the through hole of the thrust bearing ring 2. Put the flat washer 9 on the tight sleeve 7, and then use the inner hexagon socket head screw (M8) 8 to penetrate the compression sleeve 7 and screw it into the screw hole of the bearing seat 1, pre-tighten the inner hexagon socket head screw (M8) 8, so that Push the connection surface of the bearing ring 2 and the mounting surface of the bearing seat 1 just fit.

The gaps L1 and L2 are related to the materials selected for the bearing seat 1 and the thrust bearing ring 2 and the diameters of the distribution of fixing screw holes on the bearing seat 1 .

As shown in the specific implementation example, the material of the bearing seat 1 is cast aluminum with an expansion coefficient of 2.4×10 ^-5 , and the material of the thrust bearing ring 2 is bearing steel with an expansion coefficient of 1.2×10 ^-5 . The distribution diameter of the screw holes to the positioning block 6 is 367 mm, the distribution diameter of the screw holes used for the axial limit of the thrust bearing ring 2 is 421 mm, and the ambient temperature range is 80 ° C (-35 ° C ~ +45 ° C), then :

L1＝(2.4-1.2)× ^10-5 ×367×80/2≥0.2mm

L2＝(2.4-1.2)× ^10-5 ×421×80/2≥0.21mm

The materials of the thrust bearing ring 2, the radial positioning block 6 and the compression sleeve 7 are selected from steel.

Claims (10)

1. A fixing method for a thrust bearing ring, characterized in that: through three radial positioning blocks, the thrust bearing ring is radially positioned on the mounting surface of the bearing seat; The compression sleeve is embedded in multiple through holes of the cloth, and the thrust bearing ring is limited in the axial direction by the screw inserted into the compression sleeve, so that the connection surface of the thrust bearing ring and the installation surface of the bearing seat just fit; There is a gap between the radial positioning block and the compression sleeve and the thrust bearing ring, so that the thrust bearing ring can expand and contract freely when the temperature changes. 2. A method for fixing a thrust bearing ring according to claim 1, characterized in that: the thrust bearing ring has three evenly distributed slots in the circumferential direction, and the slots have two mutually parallel slots. On the side, the slotting direction is along the radial direction of the thrust bearing ring; a plurality of through holes are evenly distributed on the circumference of a certain radius. 3. A method for fixing a thrust bearing ring according to claim 2, characterized in that: the gap between the radial positioning block and the two sides of the thrust bearing ring in contact with the groove is 0.002-0.004mm . 4. A method for fixing a thrust bearing ring according to claim 1, characterized in that: said radial positioning block has an appropriate amount of gap with the radial direction of the thrust bearing ring, and when the ambient temperature changes, The radial positioning block does not interfere with the thrust bearing ring. 5. A method for fixing a thrust bearing ring according to claim 1, characterized in that: said compression sleeve has an appropriate amount of clearance with the through hole of the thrust bearing ring in the diameter direction, and at ambient temperature When changing, the compression sleeve does not interfere with the through hole of the thrust bearing ring. 6. A method for fixing a thrust bearing ring according to claim 1, characterized in that: the length of the compression sleeve is 0.01-0.02mm longer than the through hole of the thrust bearing ring, ensuring that the screw is pre-installed. After tightening, make the connection surface of the thrust bearing ring and the installation surface of the bearing seat just fit. 7. A method for fixing a thrust bearing ring according to claim 1, characterized in that: the flatness of the connecting surface of the thrust bearing ring is less than 0.01 mm. 8. A method for fixing a thrust bearing ring according to claim 1, characterized in that: the flatness of the mounting surface of the bearing housing is less than 0.01 mm. 9. A method for fixing a thrust bearing ring according to claim 1, characterized in that: the thrust bearing ring (2) is placed on the mounting surface of the bearing seat (1), and the radial positioning block ( 6) Put the spring washer (4) on top, and then install the radial positioning block (6) on the bearing seat (1) with the hexagon socket head screw M4 (5), and install it between the two sides of the radial positioning block (6). thickness, the two sides of the radial positioning block (6) are in contact with the grooved sides of the thrust bearing ring (2), ensuring that the two sides of the radial positioning block (6) in contact with the groove of the thrust bearing ring (2) The gap between the contact surfaces is 0.002-0.004mm, and there is a gap L1 in the radial direction between the radial positioning block (6) and the thrust bearing ring (2); put the compression sleeve (7) into the thrust bearing ring ( 2) In the through hole, there is a gap L2 between the outer circle of the compression sleeve (7) and the through hole of the thrust bearing ring (2). Grind the height of the compression sleeve (7) to ensure that the compression sleeve (7) is higher than the stop Push the 2 sides of the bearing ring by 0.01-0.02mm, place a flat washer (9) on the compression sleeve (7), and then penetrate the compression sleeve (7) and screw it into the bearing seat (1 ), pre-tighten the hexagon socket head screw M8 (8), so that the connecting surface of the thrust bearing ring (2) and the mounting surface of the bearing seat (1) just fit; The gaps L1 and L2 are related to the materials selected for the bearing seat (1) and the thrust bearing ring (2) and the diameters of the distribution of fixing screw holes on the bearing seat (1). 10. A method for fixing a thrust bearing ring according to claim 9, characterized in that: the material of the bearing seat (1) is cast aluminum, the expansion coefficient is 2.4×10 ^-5 , and the material of the thrust bearing ring (2) is Bearing steel with an expansion coefficient of 1.2×10 ^-5 , the distribution diameter of the screw holes used to fix the radial positioning block (6) on the bearing seat 1 is 367mm, and the screw holes used for the axial limit of the thrust bearing ring (2) The distribution diameter is 421mm, and the ambient temperature range is 80°C, that is, -35°C～+45°C, then: L1＝(2.4-1.2)× ^10-5 ×367×80/2≥0.2mm L2＝(2.4-1.2)× ^10-5 ×421×80/2≥0.21mm And the materials of the thrust bearing ring (2), the radial positioning block (6) and the compression sleeve (7) are steel.

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