Four-point contact ball bearing raceway diameter measuring tool

Abstract

The utility model provides four point contact ball bearing raceway diameter measuring frock, including carbon fibre ruler, one scale head, second scale head, measuring instrument, pillar, two same size's steel ball are respectively one steel ball and second steel ball, measuring instrument includes dial, rod sleeve and measuring rod, be provided with one scale head and second scale head on carbon fibre ruler, the rod sleeve is connected on one scale head, the dial is set up on the side of the rod sleeve close to second scale head, the rod sleeve is set up on the measuring rod, one steel ball is set up on the end of measuring rod far from second scale head, and the spring is set up between the rod sleeve and one steel ball, the pillar is connected on second scale head, and the second steel ball is set up on the end of pillar far from one scale head, can realize the four point contact ball bearing raceway diameter of the outside diameter more than 500mm and carry out the measurement.

Description

Technical Field

[0001] This utility model belongs to the field of bearing technology, and in particular to a tooling for measuring the raceway diameter of a four-point contact ball bearing. Background Technology

[0002] The raceway diameter of a deep groove ball bearing is directly marked on the bottom of the raceway groove. When assembling gauge blocks and using a carbon fiber ruler to align with the raceway diameter specified in the product drawings, it is sufficient to match the diameter.

[0003] Standard method for measuring the raceway diameter of large deep groove ball bearings: Step 1: Assemble a gauge block according to the raceway diameter in the product drawing; Step 2: Verify the gauge block using a coordinate measuring machine; Step 3: Use the gauge block as a standard part and align it with a carbon fiber ruler; Step 4: Measure the raceway diameter of the deep groove ball bearing.

[0004] The raceway diameter of four-point contact ball bearings with an outer diameter ≤ 500mm can be measured using the D012 bearing instrument. However, there is no dedicated bearing instrument for the raceway diameter of four-point contact ball bearings with an outer diameter exceeding 500mm. Therefore, it is imperative to study the measurement of the raceway diameter of four-point contact ball bearings with an outer diameter exceeding 500mm.

[0005] When measuring the raceway diameter of four-point contact ball bearings and crossed cylindrical roller bearings, steel balls are required, which are assembled onto a carbon fiber ruler for measurement. The conventional method involves adhesively attaching two steel balls to the measuring instrument tip and support respectively. This method has two drawbacks: first, the contact area between the steel balls and the measuring instrument tip and support is small, making the balls prone to detachment; second, the adhesive application is manual, making it difficult to ensure that the steel balls on both sides are at the same horizontal level, which can easily lead to measurement errors. Therefore, the development of a steel ball connection fixture is imperative. Utility Model Content

[0006] In view of the above problems, the purpose of this application is to provide a tooling for measuring the raceway diameter of four-point contact ball bearings, so that the raceway diameter of four-point contact ball bearings with an outer diameter of more than 500 mm can be measured.

[0007] To achieve some or all of the above objectives or other objectives, this application provides the following technical solution: a four-point contact ball bearing raceway diameter measuring fixture, comprising a carbon fiber ruler, a first ruler head, a second ruler head, a measuring instrument, a support column, and two steel balls of the same size, namely, steel ball number one and steel ball number two; the measuring instrument comprises a dial, a sleeve, and a measuring rod; the carbon fiber ruler is provided with a first ruler head and a second ruler head, the sleeve is connected to the first ruler head, the dial is provided on the side of the sleeve closer to the second ruler head, the sleeve is fitted onto the measuring rod, the first steel ball is provided at the end of the measuring rod away from the second ruler head, and a spring is provided between the sleeve and the first steel ball; the second ruler head is connected to the support column, the second steel ball is provided at the end of the support column away from the first ruler head.

[0008] Furthermore, it also includes a steel ball connecting fixture; the steel ball connecting fixture includes a connecting part, a transition part, and a ball loading part, the connecting part, the transition part, and the ball loading part are coaxially arranged, the transition part is located between the connecting part and the ball loading part; the connecting part is provided with an external thread, and the side of the ball loading part that connects with the steel ball is provided with a fixture groove for accommodating the steel ball, the inner diameter of the fixture groove is matched with the steel ball, and the ball loading part is in contact with the surface of the steel ball.

[0009] Furthermore, the steel ball is connected to the carbon fiber ruler via the steel ball connecting fixture. The connection method between the steel ball and the steel ball connecting fixture includes the following steps: a) Place the connecting part of the steel ball connecting fixture vertically downwards, fill the fixture groove with glue, place the steel ball in the fixture groove, and ensure that the steel ball is in full contact with the glue. It can be used after 24 hours; b) Apply glue appropriately to the circumferential direction of the outer surface of the steel ball and the steel ball connecting fixture.

[0010] Furthermore, there are two steel ball connecting fixtures, namely a first connecting fixture and a second connecting fixture; the connecting part of the first connecting fixture is provided with a first external thread, the measuring rod is provided with a first internal thread that matches the first external thread, and the first steel ball is connected to the fixture groove of the first connecting fixture; the connecting part of the second connecting fixture is provided with a second external thread, the support column is provided with a second internal thread that matches the second external thread, and the second steel ball is connected to the fixture groove of the second connecting fixture.

[0011] Furthermore, the first ruler head includes a first moving part and a first fixed seat. The carbon fiber ruler is movably connected to the first ruler head through the first moving part, and the first fixed seat is detachably connected to the rod sleeve. The second ruler head includes a second moving part and a second fixed seat. The carbon fiber ruler is movably connected to the second ruler head through the second moving part, and the second fixed seat is detachably connected to the support column.

[0012] Furthermore, the measuring instrument is a dial indicator or a micrometer.

[0013] Furthermore, the measurement method using a four-point contact ball bearing raceway diameter measuring fixture includes the following steps: Step 1: Based on the structural parameters of the four-point contact ball bearing, calculate the theoretical ball top diameter at the contact point between the rolling element and the raceway. Ball top diameter = ball bottom diameter + 2 × rolling element diameter; Step 2: Assemble the gauge blocks according to the theoretical dome diameter, and use a coordinate measuring machine to verify the dimensions of the gauge blocks; Step 3: Prepare two steel balls with the same dimensions as the rolling elements in the four-point contact ball bearing to be measured. These two steel balls are designated as steel ball number 1 and steel ball number 2. Steel balls number 1 and 2 are movably connected to a carbon fiber ruler. The side of steel ball number 1 closer to steel ball number 2 is connected to the measuring instrument, and the side of steel ball number 2 closer to steel ball number 1 is connected to a support column. Adjust the distance between the two steel balls so that the farthest distance between their outer surfaces is equal to the theoretical sphere diameter, and keep the straight line between the two steel balls horizontal with the carbon fiber ruler. Step 4: Using the gauge block identified in Step 2 as a standard part, use a carbon fiber ruler to align with the dial indicator. Step 5: Place the carbon fiber ruler and steel ball assembly into the outer raceway of the bearing, push the measuring rod to compress the spring so that the steel ball contacts the raceway, and read the actual deviation value of the raceway diameter through the measuring instrument.

[0014] Furthermore, the measurement method is applicable to the measurement of raceway diameter of crossed cylindrical roller bearings with an outer diameter greater than 500 mm.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: by using conventional methods for measuring the raceway diameter of large deep groove ball bearings, and combining the structural characteristics of four-point contact ball bearings, this invention uses steel balls as a medium to convert the raceway diameter at the contact points of four-point contact ball bearings into the diameter of the top of the steel ball that can be measured by the steel ball. A carbon fiber ruler is used to measure the raceway diameter of four-point contact ball bearings with an outer diameter greater than 500mm. This measurement method can be extended to the measurement of the raceway diameter of crossed cylindrical roller bearings with an outer diameter greater than 500mm.

[0016] Based on the principle of threaded connection between the measuring rod and the measuring head of the measuring instrument, a connecting part of the steel ball connecting fixture is designed. In addition, by increasing the contact area of ​​the steel ball and optimizing the point contact to a surface contact, a ball loading part of the steel ball connecting fixture is designed, thereby realizing the connection between the steel ball and the measuring instrument and the support.

[0017] A steel ball connecting fixture is designed. The part of the fixture that connects to the measuring rod is designed with an external thread shape that matches the measuring rod. The other side is connected to the steel ball. To prevent the steel ball from falling off, the contact area between the steel ball and the fixture can be increased by designing it as a surface contact. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 A schematic diagram of the structure connecting the first ruler head to the first steel ball; Figure 3 This is a schematic diagram of the structure connecting the second ruler head to the second steel ball; Figure 4 A schematic diagram showing the outer ring raceway diameter of a four-point contact ball bearing. Figure 5 This is a structural schematic diagram of the steel ball connection fixture; Figure 6 Left view of the steel ball connecting fixture; Figure 7 A schematic diagram of the connection between the steel ball connecting fixture and the steel ball; Figure 8 This is the front view of ruler number one; Figure 9 This is a side view of the first ruler head; Figure 10 This is a side view of the second ruler head; In the diagram: 1. Carbon fiber ruler; 2. Ruler head 1; 3. Ruler head 2; 4. Measuring instrument; 401. Dial; 402. Rod sleeve; 403. Measuring rod; 5. Support; 6. Steel ball 1; 7. Steel ball 2; 8. Spring; 9. Connecting part; 10. Transition part; 11. Ball loading part; 12. Tooling groove; 13. Connecting tool 1; 14. Connecting tool 2; 15. Moving part 1; 16. Fixed seat 1; 17. Moving part 2; 18. Fixed seat 2; 19. Bearing outer ring. Detailed Implementation

[0019] To make the structure and function of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] See appendix Figure 1-10 Taking the measurement of the outer raceway diameter as an example, the four-point contact ball bearing raceway diameter measuring fixture includes a carbon fiber ruler 1, a first ruler head 2, a second ruler head 3, a measuring instrument 4, a support 5, and two steel balls of the same size, namely a first steel ball 6 and a second steel ball 7. The two steel balls have the same size as the rolling elements in the four-point contact ball bearing to be measured. The measuring instrument 4 includes a dial 401, a rod sleeve 402, and a measuring rod 403. The rod sleeve 402 is fixedly connected to the dial 401, and the rod sleeve 402 is fitted onto the measuring rod 403. The measuring rod 403 is slidably connected along the axial direction of the rod sleeve 402. The carbon fiber... The measuring ruler 1 is equipped with a first measuring head 2 and a second measuring head 3. A rod sleeve 402 is connected to the first measuring head 2. A dial 401 is installed on the side of the rod sleeve 402 closer to the second measuring head 3, and a measuring rod 403 is installed on the side of the rod sleeve 402 away from the second measuring head 3. A first steel ball 6 is installed at the end of the measuring rod 403 away from the second measuring head 3. A spring 8 is installed between the rod sleeve 402 and the first steel ball 6. A support column 5 is connected to the second measuring head 3. A second steel ball 7 is installed at the end of the support column 5 away from the first measuring head 2. The straight line between the first measuring head 2 and the second measuring head 3 is horizontal to the carbon fiber ruler 1.

[0021] It also includes a steel ball connecting fixture; the steel ball connecting fixture includes a connecting part 9, a transition part 10 and a ball loading part 11, the connecting part 9, the transition part 10 and the ball loading part 11 are coaxially arranged, the transition part 10 is disposed between the connecting part 9 and the ball loading part 11; the connecting part 9 is provided with an external thread, and the side of the ball loading part 11 that connects with the steel ball is provided with a fixture groove 12 for accommodating the steel ball, the inner diameter of the fixture groove 12 matches the steel ball, and the ball loading part 11 contacts the surface of the steel ball; the contact surface between the fixture groove and the steel ball is arc-shaped, so that the fixture groove contacts the surface of the steel ball.

[0022] The key point of this utility model is that, based on the principle of threaded connection between the measuring rod and the measuring head of conventional measuring instruments, a part of the steel ball connection fixture is designed. In addition, by increasing the contact area of ​​the steel ball and optimizing the point contact to a surface contact, another part of the fixture structure is designed, thereby realizing the connection between the steel ball and the measuring instrument and the carbon fiber ruler support.

[0023] The steel ball is connected to the carbon fiber ruler 1 through the steel ball connecting fixture. The connection method between the steel ball and the steel ball connecting fixture includes the following steps: a) Place the connecting part 9 of the steel ball connecting fixture vertically downwards, fill the fixture groove 12 with glue, place the steel ball in the fixture groove 12, and make the steel ball fully contact the glue. It can be used after 24 hours; b) Apply glue appropriately in the circumferential direction on the outer surface of the steel ball and the steel ball connecting fixture.

[0024] Assemble the tooling with the steel balls glued on to the measuring instrument and support. After assembly, the raceway diameter of the four-point contact ball bearing and the crossed cylindrical roller bearing can be measured.

[0025] The device includes two steel ball connecting fixtures: a first connecting fixture 13 and a second connecting fixture 14. The connecting part 9 of the first connecting fixture 13 is provided with a first external thread, and the measuring rod 403 is provided with a first internal thread that matches the first external thread. The first steel ball 6 is connected to the fixture groove 12 of the first connecting fixture 13. The connecting part 9 of the second connecting fixture 14 is provided with a second external thread, and the support column 5 is provided with a second internal thread that matches the second external thread. The second steel ball 7 is connected to the fixture groove 12 of the second connecting fixture 14.

[0026] The first ruler head 2 includes a first moving part 15 and a first fixed seat 16. The carbon fiber ruler 1 is movably connected to the first ruler head 2 through the first moving part, and the first fixed seat is detachably connected to the rod sleeve 402. The second ruler head 3 includes a second moving part 17 and a second fixed seat 18. The carbon fiber ruler 1 is movably connected to the second ruler head 3 through the second moving part, and the second fixed seat is detachably connected to the support column 5.

[0027] The measuring instrument 4 is a dial indicator or a micrometer.

[0028] The measurement method using a four-point contact ball bearing raceway diameter measuring fixture includes the following steps: Step 1: Based on the structural parameters of the four-point contact ball bearing, calculate the theoretical ball top diameter at the contact point between the rolling element and the raceway. Ball top diameter (D) = ball bottom diameter (d) + 2 × rolling element diameter (S). Step 2: Assemble the gauge blocks according to the theoretical dome diameter, and use a coordinate measuring machine to verify the dimensions of the gauge blocks; Step 3: Prepare two steel balls with the same dimensions as the rolling elements in the four-point contact ball bearing to be measured. The two steel balls are steel ball 6 (number 1) and steel ball 7 (number 2). Steel ball 6 and steel ball 7 are movably connected to the carbon fiber ruler 1. The side of steel ball 6 closest to steel ball 7 is connected to the measuring instrument 4, and the side of steel ball 7 closest to steel ball 6 is connected to the support column 5. Adjust the distance between the two steel balls so that the farthest distance between the outer surfaces of the two steel balls is equal to the theoretical sphere diameter, and keep the straight line between the two steel balls horizontal with the carbon fiber ruler 1. Step 4: Using the gauge block identified in Step 2 as a standard part, use a carbon fiber ruler 1 to align with the dial indicator. Step 5: Place the carbon fiber ruler 1 and steel ball assembly into the outer raceway of the bearing, push the measuring rod 402 to compress the spring 8 so that the steel ball contacts the raceway, and read the actual deviation value of the raceway diameter through the measuring instrument 4.

[0029] The measurement method is applicable to the measurement of raceway diameter of crossed cylindrical roller bearings with an outer diameter greater than 500 mm.

[0030] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A fixture for measuring the raceway diameter of a four-point contact ball bearing, characterized in that: The device includes a carbon fiber ruler, a first ruler head, a second ruler head, a measuring instrument, a support column, and two steel balls of the same size, designated as steel ball number one and steel ball number two. The measuring instrument includes a dial, a sleeve, and a measuring rod. The carbon fiber ruler has a first ruler head and a second ruler head. The sleeve is connected to the first ruler head, and the dial is located on the side of the sleeve closer to the second ruler head. The sleeve is fitted onto the measuring rod, and the first steel ball is located at the end of the measuring rod furthest from the second ruler head. A spring is installed between the sleeve and the first steel ball. The support column is connected to the second ruler head, and the second steel ball is located at the end of the support column furthest from the first ruler head.

2. The four-point contact ball bearing raceway diameter measuring fixture according to claim 1, characterized in that: It also includes a steel ball connecting fixture; the steel ball connecting fixture includes a connecting part, a transition part and a ball loading part, the connecting part, the transition part and the ball loading part are coaxially arranged, the transition part is located between the connecting part and the ball loading part; the connecting part is provided with an external thread, and the side of the ball loading part that connects with the steel ball is provided with a fixture groove for accommodating the steel ball, the inner diameter of the fixture groove is matched with the steel ball, and the ball loading part is in contact with the surface of the steel ball.

3. The four-point contact ball bearing raceway diameter measuring fixture according to claim 2, characterized in that: The device includes two steel ball connecting fixtures, namely, connecting fixture No. 1 and connecting fixture No.

2. The connecting part of connecting fixture No. 1 is provided with external thread No. 1, the measuring rod is provided with internal thread No. 1 that matches external thread No. 1, and the steel ball No. 1 is connected to the fixture groove of connecting fixture No.

1. The connecting part of connecting fixture No. 2 is provided with external thread No. 2, the support column is provided with internal thread No. 2 that matches external thread No. 2, and the steel ball No. 2 is connected to the fixture groove of connecting fixture No.

2.

4. The four-point contact ball bearing raceway diameter measuring fixture according to claim 1, characterized in that: The first ruler head includes a first moving part and a first fixed base. The carbon fiber ruler is movably connected to the first ruler head through the first moving part, and the first fixed base is detachably connected to the rod sleeve. The second ruler head includes a second moving part and a second fixed base. The carbon fiber ruler is movably connected to the second ruler head through the second moving part, and the second fixed base is detachably connected to the support column.

5. The four-point contact ball bearing raceway diameter measuring fixture according to claim 1, characterized in that: The measuring instrument is a dial indicator or a micrometer.

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