Simple measuring instrument for curvature of ball bearing inner ring channel

Abstract

The utility model relates to a simple measuring instrument for the curvature of a ball bearing inner ring channel. The device comprises a seat body, a first core shaft, a second core shaft, an instrument fixing frame, a first instrument and a second instrument, a vertical fixing panel is arranged on the seat body, a first shaft hole and a second shaft hole which are transversely arranged are formed in the fixing panel, the rear end of the first core shaft is fixed in the first shaft hole, the rear end of the second core shaft is fixed in the second shaft hole, the instrument fixing frame is fixed at the top of the fixing panel, and the instrument fixing frame is fixed at the bottom of the fixing panel. A first measuring rod of the first instrument and a second measuring rod of the second instrument are respectively and movably fixed on the instrument fixing frame, a first measuring head is arranged at the lower end of the first measuring rod, and a second measuring head is arranged at the lower end of the second measuring rod; and the middle part of the instrument fixing frame is connected to the top of the fixed panel in a sliding manner and can move back and forth or be fixed along the top of the fixed panel.

Description

Technical Field

[0001] This utility model relates to a ball bearing inner ring groove curvature measuring device, and in particular discloses a simple measuring instrument for the inner ring groove curvature of a ball bearing. Background Technology

[0002] The curvature R of the ball bearing raceway is generally measured using two methods: one is the comparative method, and the other is the method using high-precision instruments.

[0003] The comparative method of measurement is generally based on the two limit deviations R of the curvature tolerance RES EI of the target groove 3 of the ball bearing. ES and R EI Two gauges are made, named Large Gauge 1 and Small Gauge 2. During measurement, as follows... Figure 1 , Figure 2 and Figure 3 As shown, the two gauges are compared with the target channel 3 respectively. The contact between the gauges and the arc of the target channel 3 is observed to determine whether the channel curvature is between the two gauges, thus determining whether the channel curvature meets the requirements; for example... Figure 2 If there is a bottom gap 4 between the bottom of the large channel 1 and the bottom of the target channel 3, it means that the curvature of the target channel 3 is smaller than that of the large channel 1; as shown in Figure 3, if there is a side gap 5 between the small channel 2 and the two sides of the target channel 3, it means that the curvature of the target channel 3 is greater than that of the small channel 2.

[0004] The advantages of the comparative method of measurement are: it is quick and intuitive, and can be performed next to the processing equipment.

[0005] Its disadvantages are: it can only qualitatively determine whether the channel curvature is qualified, but cannot obtain the numerical value of the channel curvature. When the channel curvature exceeds the gauge size, the operator of the processing equipment cannot read the curvature value, and cannot make precise adjustments when adjusting the machine tool. They can only make adjustments based on experience, which takes a long time and affects production efficiency.

[0006] (2) High-precision instruments are used for measurement, generally profilometers are used for detection.

[0007] Its advantages are: accuracy and the ability to read numerical values.

[0008] The disadvantages are: slow testing speed and low efficiency. It cannot perform batch testing of bearing raceway curvature, and is generally used for very low-frequency sampling inspections. Furthermore, the profilometer is a high-precision instrument that must be placed in a temperature- and humidity-controlled environment away from vibration, making it far from the processing equipment and inconvenient for timely testing of raceway curvature. Each measurement causes wear on the profilometer's probe, and excessive measurements increase the probe replacement frequency, raising measurement costs. Summary of the Invention

[0009] The purpose of this invention is to overcome the defects in the existing technology and provide a simple measuring instrument for the curvature of the inner ring groove of a ball bearing that provides accurate, intuitive, and rapid measurement.

[0010] This utility model is implemented as follows: A simple measuring instrument for the curvature of the inner ring groove of a ball bearing includes a base 6, a first spindle 10, a second spindle 11, an instrument mounting bracket 12, a first instrument 13, and a second instrument 14; the base 6 is provided with a vertically fixed panel 7, and the fixed panel 7 is provided with a horizontally arranged first shaft hole 8 and a second shaft hole 9. The rear end of the first spindle 10 is fixed in the first shaft hole 8, and the rear end of the second spindle 11 is fixed in the second shaft hole 9. The instrument mounting bracket 12 is fixed to the top of the fixed panel 7, and the first measuring rod 26 of the first instrument 13 and the second instrument 14 are... The second measuring rod 27 is movably fixed on the instrument mounting bracket 12. The axis of the first measuring rod 26 is perpendicular to the axis of the first spindle 10, and the axis of the second measuring rod 27 is perpendicular to the axis of the second spindle 11. The lower end of the first measuring rod 26 is provided with a first measuring head 28, and the lower end of the second measuring rod 27 is provided with a second measuring head 19. The middle part of the instrument mounting bracket 12 is slidably connected to the top of the fixed panel 7 and can move back and forth or be fixed along the top of the fixed panel 7. The moving direction of the instrument mounting bracket 12 is parallel to the axis of the first spindle 10 and the axis of the second spindle 11.

[0011] The instrument mounting bracket 12 includes a horizontal fixing arm 20, a longitudinal slide bar 21 and a first fastening screw 16. The front end of the longitudinal slide bar 21 is fixed to the middle of the horizontal fixing arm 20, forming an inverted "T" shape. The longitudinal slide bar 21 is provided with a sliding groove 15. The first fastening screw 16 passes through the sliding groove 15 from top to bottom and is connected to the fixing panel 7.

[0012] A first end cap 17 and a second fastening screw 18 are provided behind the first shaft hole 8. The second fastening screw 18 passes through the first end cap 17 and the first shaft hole 8 and is connected to the rear end of the first spindle 10.

[0013] A second end cap 23 and a third fastening screw 24 are provided behind the second shaft hole 9. The third fastening screw 24 passes through the second end cap 23 and the second shaft hole 9 and is connected to the rear end of the second spindle 11.

[0014] The second measuring head 19 is a cylindrical measuring head; the first measuring head 28 is a hemispherical side head.

[0015] The top of the fixed panel 7 is provided with a groove 22 for placing the longitudinal slide bar 21.

[0016] The second measuring head 19 is detachably connected to the lower end of the second measuring rod 27 via a fourth fastening screw 25.

[0017] The first measuring rod 26 is fixed to the instrument mounting bracket 12 by the fifth fastening screw 29 and the second measuring rod 27 is fixed to the instrument mounting bracket 12 by the sixth fastening screw 30.

[0018] It also includes a zero-alignment standard part 31, which is ring-shaped and is sleeved on the first mandrel 10.

[0019] The diameter D of the second measuring head 19 is H / 2 to 7 / 8H, where H is the width of the inner ring groove of the ball bearing being measured.

[0020] The beneficial effect of this utility model is that by using the first and second instruments in conjunction with the first and second mandrels to measure two values ​​of the tested raceway, the groove curvature value of the tested inner raceway can be directly calculated.

[0021] Compared to the comparative method for range determination, the measurement values ​​of this invention are accurate and can be calculated intuitively, overcoming the shortcomings of the comparative measurement method. Compared to profilometer measurement, the instrument of this invention is inexpensive and can be used directly next to the machine tool, with no stringent requirements for the instrument's operating conditions. Furthermore, it allows for higher measurement frequency and faster measurement, making it more advantageous. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the target channel in the existing technology.

[0023] Figure 2 This is a diagram showing the positional relationship between the large channel and the target channel when measured using the comparative method with existing technology.

[0024] Figure 3 This is a diagram showing the positional relationship between Xiao Fan and the target channel when measured using the comparison method with existing technology.

[0025] Figure 4 This is a schematic diagram of the structure from the main view direction of this utility model.

[0026] Figure 5 yes Figure 4 A schematic diagram of the cross-sectional structure along the AA direction.

[0027] Figure 6 yes Figure 4 A schematic diagram of the cross-sectional structure along the BB direction.

[0028] Figure 7 This is a top view structural diagram of this utility model.

[0029] Figure 8This is a schematic diagram showing the positional relationship between the inner ring of the bearing being tested and the first instrument during zeroing in the use of this utility model.

[0030] Figure 9 This is a schematic diagram showing the positional relationship between the zeroing standard and the first instrument during zeroing in the use of this utility model.

[0031] Figure 10 This is a schematic diagram showing the positional relationship between the zeroing standard and the second instrument during zeroing in the use of this utility model.

[0032] Figure 11 This utility model provides a schematic diagram illustrating the positional relationship between the inner ring of the bearing being measured and the first instrument during the measurement process.

[0033] Figure 12 This utility model provides a schematic diagram illustrating the positional relationship between the inner ring of the bearing being measured and the second instrument during the measurement process.

[0034] Figure 13 This is a schematic diagram of the geometric relationship between the second measuring head of this utility model and the inner ring of the bearing being measured.

[0035] Among them: 1. Large groove; 2. Small groove; 3. Target channel; 4. Bottom clearance; 5. Side clearance;

[0036] 6. Base; 7. Fixed panel; 8. First shaft hole; 9. Second shaft hole; 10. First spindle; 11. Second spindle; 12. Instrument mounting bracket; 13. First instrument; 14. Second instrument; 15. Sliding groove; 16. First fastening screw; 17. First end cap; 18. Second fastening screw; 19. Second measuring head; 20. Lateral fixed arm; 21. Longitudinal slide bar; 22. Groove; 23. Second end cap; 24. Third fastening screw; 25. Fourth fastening screw; 26. First measuring rod; 27. Second measuring rod; 28. First measuring head; 29. ​​Fifth fastening screw; 30. Sixth fastening screw; 31. Zeroing standard part; 32. Inner ring of the bearing to be measured. Detailed Implementation

[0037] according to Figures 4-13 This utility model is a simple measuring instrument for the curvature of the inner ring groove of a ball bearing, including a base 6, a first spindle 10, a second spindle 11, an instrument mounting bracket 12, a first instrument 13, and a second instrument 14.

[0038] The base 6 is provided with a vertical fixing panel 7, which has a first shaft hole 8 and a second shaft hole 9 arranged horizontally. The rear end of the first spindle 10 is fixed in the first shaft hole 8, and the rear end of the second spindle 11 is fixed in the second shaft hole 9. Specifically, a first end cap 17 and a second fastening screw 18 are provided behind the first shaft hole 8. The second fastening screw 18 passes through the first end cap 17 and the first shaft hole 8 and is connected to the rear end of the first spindle 10. The diameter of the first shaft hole 8 is smaller than the diameter of the first end cap 17. A second end cap 23 and a third fastening screw 24 are provided behind the second shaft hole 9. The third fastening screw 24 passes through the second end cap 23 and the second shaft hole 9 and is connected to the rear end of the second spindle 11. The diameter of the second shaft hole 9 is smaller than the diameter of the second end cap 23.

[0039] The instrument mounting bracket 12 is fixed to the top of the mounting panel 7. The first measuring rod 26 of the first instrument 13 and the second measuring rod 27 of the second instrument 14 are respectively movably fixed to the instrument mounting bracket 12. The first measuring rod 26 and the second measuring rod 27 can move up and down or be fixed. Specifically, the first measuring rod 26 is fixed to the instrument mounting bracket 12 by a fifth fastening screw 29 and the second measuring rod 27 is fixed to the instrument mounting bracket 12 by a sixth fastening screw 30. When the fifth fastening screw 29 and the sixth fastening screw 30 are loosened, the first measuring rod 26 and the second measuring rod 27 can move up and down. The axis of the first measuring rod 26 is perpendicular to the axis of the first spindle 10, and the axis of the second measuring rod 27 is perpendicular to the axis of the second spindle 11. The lower end of the first measuring rod 26 is provided with a first measuring head 28, and the lower end of the second measuring rod 27 is provided with a second measuring head 19. The second measuring head 19 is detachably connected to the lower end of the second measuring rod 27 by a fourth fastening screw 25. The second measuring head 19 is a cylindrical measuring head; the diameter D of the second measuring head 19 is H / 2~7 / 8H, where H is the width of the inner ring groove of the ball bearing being measured. The first measuring head 28 is a hemispherical side head.

[0040] The instrument mounting bracket 12 is slidably connected to the top of the mounting panel 7 at its middle section and can move back and forth or be fixed along the top of the mounting panel 7. The moving direction of the instrument mounting bracket 12 is parallel to the axis of the first spindle 10 and the axis of the second spindle 11. Preferably, the instrument mounting bracket 12 includes a transverse fixing arm 20, a longitudinal slide rod 21, and a first fastening screw 16. The front end of the longitudinal slide rod 21 is fixed to the middle of the transverse fixing arm 20, forming an inverted "T" shape. The longitudinal slide rod 21 is provided with a sliding groove 15, and the first fastening screw 16 passes through the sliding groove 15 from top to bottom and is connected to the mounting panel 7. The top of the mounting panel 7 is provided with a groove 22 for placing the longitudinal slide rod 21.

[0041] In use, this utility model also includes a zeroing standard 31 used for zeroing the instrument before measurement. The zeroing standard 31 is annular and is sleeved on the first mandrel 10. The inner diameter of the zeroing standard 31 is the same as the inner diameter of the inner ring 32 of the bearing being measured, and the outer diameter of the zeroing standard 31 is the same as the groove diameter of the inner ring 32 of the bearing being measured.

[0042] The process of adjusting and aligning to zero during use is as follows:

[0043] 1. Fit the inner ring 32 of the bearing to be tested onto the first mandrel 10, with its inner end face pressed against the surface of the fixing panel 7 of the seat 6. Slightly loosen the first fastening screw 16 and move the instrument mounting bracket 12 back and forth. When the reading of the first instrument 13 is at its minimum value, tighten the first fastening screw 16 to fix the position of the instrument mounting bracket 12. At this time, the first measuring head 28 of the first instrument 13 is exactly located at the bottom of the groove of the inner ring 32 of the bearing to be tested. Figure 8 As shown.

[0044] 2. Remove the inner ring. Insert the zeroing standard part 31 onto the first mandrel 10, ensuring one end face is flush against the surface of the fixing panel 7. Then adjust the first instrument 13 to the zero position. Next, insert the zeroing standard part 31 onto the second mandrel 11, ensuring one end face is flush against the surface of the fixing panel 7. Then adjust the second instrument 14 to the zero position. (The rest of the text is missing.) Figure 9 , Figure 10 As shown. At this point, the instrument adjustment and zeroing are complete. Measurements can now be performed normally.

[0045] 3. Measurement and Calculation

[0046] according to Figures 11-12 First, fit the inner ring 32 of the bearing under test onto the first mandrel 10, ensuring its inner end face is flush against the surface of the fixing panel 7, and read the value A. Then, fit the inner ring 32 of the bearing under test onto the second mandrel 11, ensuring its end face is flush against the surface of the fixing panel 7, and read the value B. (The rest of the text is missing.) Figure 6 As shown.

[0047] By substituting values ​​A and B into the calculation formula, the measured value of the groove curvature R of the inner ring 32 of the bearing under test can be calculated.

[0048]

[0049] The geometric relationship between the second measuring head 19 and the groove of the inner ring 32 of the bearing being measured is as follows: Figure 13 As shown, the geometric relationships are as follows:

[0050] ① ac² + co² = ao²

[0051] ② ac = 0.5D

[0052] ③ co=do-cd

[0053] ④ cd = b - a

[0054] ⑤ ao=do=R

[0055] Combining the five formulas above, we can obtain the formula for calculating the groove curvature R of the inner ring 32 of the tested bearing:

[0056]

[0057] Where D is the diameter of the second measuring head 19, which is a known value; B is the measurement reading of the second instrument 14; and A is the measurement reading of the first instrument 13.

Claims

1. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing, characterized in that: The instrument includes a base (6), a first spindle (10), a second spindle (11), an instrument mounting bracket (12), a first instrument (13), and a second instrument (14). The base (6) has a vertically fixed panel (7), and the fixed panel (7) has a horizontally arranged first shaft hole (8) and second shaft hole (9). The rear end of the first spindle (10) is fixed in the first shaft hole (8), and the rear end of the second spindle (11) is fixed in the second shaft hole (9). The instrument mounting bracket (12) is fixed to the top of the fixed panel (7). The first measuring rod (26) of the first instrument (13) and the second measuring rod (27) of the second instrument (14) are respectively movable. The instrument is fixedly mounted on the instrument mounting bracket (12). The axis of the first measuring rod (26) is perpendicular to the axis of the first spindle (10), and the axis of the second measuring rod (27) is perpendicular to the axis of the second spindle (11). The lower end of the first measuring rod (26) is provided with a first measuring head (28), and the lower end of the second measuring rod (27) is provided with a second measuring head (19). The middle part of the instrument mounting bracket (12) is slidably connected to the top of the fixed panel (7) and can move back and forth or be fixed along the top of the fixed panel (7). The moving direction of the instrument mounting bracket (12) is parallel to the axis of the first spindle (10) and the axis of the second spindle (11).

2. The simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1, characterized in that: The instrument mounting bracket (12) includes a transverse fixing arm (20), a longitudinal slide bar (21) and a first fastening screw (16). The front end of the longitudinal slide bar (21) is fixed to the middle of the transverse fixing arm (20) to form an inverted "T" shape. The longitudinal slide bar (21) is provided with a sliding groove (15). The first fastening screw (16) passes through the sliding groove (15) from top to bottom and is connected to the fixing panel (7).

3. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1, characterized in that: A first end cap (17) and a second fastening screw (18) are provided behind the first shaft hole (8). The second fastening screw (18) passes through the first end cap (17) and the first shaft hole (8) and is connected to the rear end of the first spindle (10). A second end cap (23) and a third fastening screw (24) are provided behind the second shaft hole (9). The third fastening screw (24) passes through the second end cap (23) and the second shaft hole (9) and is connected to the rear end of the second spindle (11).

4. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1, characterized in that: The second measuring head (19) is a cylindrical measuring head; the first measuring head (28) is a hemispherical side head.

5. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 2, characterized in that: The top of the fixed panel (7) is provided with a groove (22) for placing the longitudinal slide bar (21).

6. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1 or 4, characterized in that: The second measuring head (19) is detachably connected to the lower end of the second measuring rod (27) by a fourth fastening screw (25).

7. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1, characterized in that: The first measuring rod (26) is fixed to the instrument mounting bracket (12) by the fifth fastening screw (29) and the second measuring rod (27) is fixed to the instrument mounting bracket (12) by the sixth fastening screw (30).

8. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 1, characterized in that: It also includes a zero-alignment standard (31), which is annular and is fitted onto the first mandrel (10).

9. A simple measuring instrument for the curvature of the inner ring groove of a ball bearing according to claim 4, characterized in that: The diameter D of the second measuring head (19) is H / 2~7 / 8H, where H is the width of the inner ring groove of the ball bearing being measured.

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