Device and method for measuring tooth profile runout value of internal spline of shaft hole type part

Abstract

The invention discloses a device and a method for measuring the tooth profile runout value of an internal spline of a shaft hole part, and belongs to the technical field of motor manufacturing. The internal spline of the to-be-measured part and the dial indicator are connected through the lever structure, the inner wall run-out variable of the shaft hole part can be directly measured, the operation is simple, the design is unique, and the method is ingenious; the design that the two tips abut against each other can ensure that the center of the shaft to be measured is always coincident with the center of the tip hole of the device, and the device has universality for shafts with different shaft diameters; the long-strip hole guide rails are designed on the bottom plate, so that universality is achieved for shafts with different lengths; the measuring head and the tip can be replaced according to the size of a workpiece, and the structure has universality; the extension length of the measuring head can be adjusted through the hexagon socket cap screw, the screw and the nut, and the design can realize the measurement of the gear ring run-out values at different positions of the same internal spline, and has flexibility.

Description

Technical Field

[0001] The invention discloses a device and a method for measuring the runout value of a spline tooth profile in a shaft hole type part, belonging to the technical field of motor manufacturing. Background Art

[0002] Shaft holes are common mechanical parts. Currently, there are different methods for measuring the circular runout of the spline in such parts, including optical measuring instruments, three-coordinate measuring instruments, target detection methods, non-contact detection methods, and physical force detection methods. The measurement results are often inaccurate when using the light and shadow measurement method, and the three-coordinate detection method is relatively expensive. Therefore, it is very necessary to design a simple, practical and accurate measuring device. Summary of the invention

[0003] The objects of the present invention are:

[0004] The design of long hole guide rails allows the measurement of shaft hole parts of different lengths to be adapted. Taking into account that the gear ring runout of the internal spline can be directly measured, an innovative lever structure is applied to ensure that the measuring contact and the dial indicator contact move simultaneously. The double center design allows the center of the device's center hole to coincide with the axis of the shaft hole part to be measured.

[0005] The research in this project has positive significance for improving the efficiency and accuracy of measuring the runout of spline gear rings in shaft and hole parts. It has good processability and high application value in actual production.

[0006] The technical scheme of the present invention is: a device for measuring the runout value of the spline tooth profile in shaft hole parts, comprising a base plate 2, a screw plug 3, a spring a4, a bracket 5, a lever 6, a measuring lever 11, a live center 12, a bushing 13, a pin a14, a pull rod 15, a movable support 16, a spring b17, a baffle 18, a handle 20, a center 24, a probe 25, and a top block 27; the base plate 2 is slidably matched with the movable support 16, the baffle 18 is fixed on the movable support 16, the bushing 13 is installed in the hole of the movable support 16, and the live center 12 is installed On the bushing 13, the live center 12 is threadedly connected to the pull rod 15 and fixed by the pin 14; the spring 17 passes through the pull rod 15 and abuts between the live center 12 and the baffle 18, and the handle 20 is fixed on the movable support 16; the bracket 5 is fixed to one side of the base plate 2, and the lever 6 is fixed to the bracket 5. The lever 6 abuts against the contact of the dial indicator through the boss, the plug 3 and the bracket 5 are connected by threads, and a spring 4 is provided between the top block 27 and the plug 3. One side of the measuring lever 11 is connected to the lever 6, and the other side passes through the center 24 and cooperates with the probe 25.

[0007] The bottom plate 2 is a plate-like structure, and is provided with two corresponding long holes parallel to the length direction in the middle, which are slidably connected to the movable support 16 .

[0008] The bottom of the bracket 5 is a rectangular parallelepiped structure, with a fixing plate 5-1 at the left end of the upper surface, a support frame 5-2 and a meter frame 5-3 in the middle; the top 24 is fixedly connected to the tapered hole of the fixing plate 5-1, the lever 6 is installed on the support frame 5-2, and the dial indicator head 28 is fixed on the meter frame 5-3.

[0009] The lever 6 is a columnar step structure, with a mounting hole at the bottom of one end. The measuring lever 11 is installed in the mounting hole and fixed by a hexagon socket head screw 8. A boss is provided at the other end where the contact with the dial indicator head 28 is located, and the surface roughness of the boss is 0.8-1.6.

[0010] The live center 12 is a columnar structure with a stepped hole, and the end connected to the measured shaft is conical and matches with the 60° tapered hole of the measured shaft. The stepped hole matches with the pull rod 15 equipped with a spring 17.

[0011] The center point 24 is coaxial with the center of the conical surface of the live center point 12 .

[0012] The spring 17 is made of HB362-71 with a specification of 1.5×16×40 mm.

[0013] One side of the pull rod 15 is milled with a flattened portion to fit into a rectangular notch on the handle 20 .

[0014] The measuring method of the device for measuring the runout value of the internal spline tooth profile of shaft hole parts is as follows: during measurement, the center point 24 is first inserted into the shaft hole to be measured, and then the handle 20 is pulled to insert the live center point 12 into the other end of the shaft to be measured; the probe 25 is pressed against the part of the workpiece to be measured by means of the lever 6, and the workpiece is rotated so that the probe 25 passes through the part of the workpiece to be measured, and the runout of the internal spline of the shaft is converted into the numerical change of the dial indicator through the lever 6; one end of the lever 6 is pressed against the dial indicator probe, and the measuring lever 11 is inserted into the hole at the other end of the lever 6, and the probe 25 is fixed on the measuring lever 11, and the probe 25 is pressed against the spline part to be measured of the shaft to be measured, and the probe 25 contacts the pitch circle position of the spline of the shaft to be measured, thereby measuring the runout value, and then obtaining the runout variable of the internal spline of the shaft to be measured.

[0015] The beneficial effects of the present invention are:

[0016] The present invention connects the internal spline of the part to be measured and the dial indicator through a lever structure, and can directly measure the inner wall runout variable of shaft hole parts. The operation is simple and the design is unique and ingenious. The design of two top points facing each other can ensure that the center of the measured shaft is always coincident with the center of the top hole of the device, and it is universal for shafts with different shaft diameters. The design of the long hole guide rail on the bottom plate 2 is universal for shafts of different lengths. The probe 25 and the top point 24 can be replaced according to the size of the workpiece, and the structure is universal. The length of the probe 25 can be adjusted by the hexagon socket head screw 8, the screw 9, and the nut 10. This design can realize the measurement of the runout value of the gear ring at different positions of the same internal spline, and it is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional view of the present invention;

[0018] Figure 2 It is a right side view of the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the base plate 2;

[0020] Figure 4 It is a schematic diagram of the structure of the bracket 5;

[0021] Figure 5 It is a structural schematic diagram of the movable support 16;

[0022] Figure 6 It is a schematic diagram of the structure of lever 6;

[0023] Figure 7 It is a schematic diagram of the structure of the measuring lever 11 and the measuring head 25;

[0024] Figure 8 Partial schematic diagram of the probe when the toothed runout bracket is working.

[0025] Among them: 1-hexagon socket head screw, 2-base plate, 3-screw plug, 4-spring, 5-bracket, 6-lever, 8-hexagon socket head screw, 9-screw b, 10-nut, 11-measuring lever, 12-live top, 13-bushing, 14-pin a, 15-pull rod, 16-movable support, 17-spring, 18-baffle, 19-hexagon nut, 20-handle, 21-pin b, 22-T-slot bolt, 23-screw c, 24-top, 25-probe, 26-washer, top block 27, 28-dial indicator head DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings:

[0027] like Figure 1 , Figure 2As shown, a device for measuring the runout value of the spline tooth profile of shaft hole parts includes: a hexagon socket head screw 1, a base plate 2, a screw plug 3, a spring 4, a bracket 5, a lever 6, a hexagon socket head screw 8, a screw b9, a nut 10, a measuring lever 11, a live center 12, a bushing 13, a pin a14, a pull rod 15, a movable support 16, a spring 17, a baffle 18, a hexagonal nut 19, a handle 20, a pin b21, a T-slot bolt 22, a screw c23, a center 24, a probe 25, a washer 26, and a top block 27; the base plate 2 is slidably matched with the movable support 16, and the movable support 16 is fixed by the T-slot bolt 22, the washer 26, and the hexagonal nut 19; the baffle 18 is fixed to the movable support 16 by four screws c23, and the movable support 16 is equipped with a bushing Sleeve 13, live center 12 is threadedly connected with pull rod 15 and fixed by pin 14; spring 17 passes through pull rod 15 and rests between live center 12 and baffle 18. When the device is not working, spring 17 is in the position of natural length; handle 20 is fixed to movable support 16 by pin b21; bracket 5 is fixed to one side of base plate 2 by hexagon socket cylindrical head screw 1, lever 6 is fixed to bracket 5 by hexagon socket cylindrical head screw 8, screw b9 and nut 10, the contact of dial indicator passes through the through hole at the top of the table frame and is fixed by screw c23, plug 3 and bracket 5 are connected by threads, spring 4 is provided between top block 27 and plug 3, one side of measuring lever 11 is connected to lever 6 by hexagon socket cylindrical head screw 8, and the other side passes through center 24 and cooperates with probe 25.

[0028] like Figure 3 As shown, the bottom plate 2 is a plate-like structure, with two corresponding long holes parallel to the length direction in the middle, which are slidably connected to the movable support 16; the design of the long hole guide rail realizes the purpose of moving the movable support 16 left and right on the bottom plate.

[0029] like Figure 4 As shown, the bottom of the bracket 5 is a rectangular parallelepiped structure, with a fixing plate 5-1 at the left end of the upper surface, a support frame 5-2 and a meter frame 5-3 in the middle; the top 24 is fixedly connected to the tapered hole of the fixing plate 5-1, the lever 6 is installed on the support frame 5-2, and the dial indicator head 28 is fixed on the meter frame 5-3. The bottom surface is fixed to one side of the base plate 2 by a hexagon socket head screw 1, and the top 24 is connected and positioned with the bracket 5 by a taper fit. The meter frame 5-3 uses an open slot structure and a screw a7 to lock the meter head on the bracket 5. The schematic diagram of the assembly structure of the bracket 5 is shown in FIG. Figure 3 shown.

[0030] like Figure 6As shown, the lever 6 is a columnar step structure, with a mounting hole at the bottom of one end, and the measuring lever 11 is installed in the mounting hole and fixed by a hexagon socket head screw 8. The other end is provided with a boss at the contact position with the dial gauge head 28, and the surface roughness of the boss is 0.8-1.6. The lever 6 is locked with the measuring lever 11 by the hexagon socket head screw 8, and fixed to the bracket 5 by screws b9 and nuts 10, and the lever 6 is against the dial gauge contact 28 through the boss.

[0031] like Figure 7 As shown, one side of the measuring lever 11 is designed with a conical surface and a conical hole, which cooperates with the lever 6, and the other end is installed with a probe 25.

[0032] The spring 17 is a standard part, code-named 1.5×16×40HB362-71.

[0033] The bushing 13 and the movable support 16 are tightly matched by interference fitting;

[0034] The live center 12 is a columnar structure with a stepped hole, and the end connected to the measured shaft is conical, which matches the 60° tapered hole of the measured shaft, and the stepped hole matches the pull rod 15 equipped with a spring 17. An inner hole is drilled on the live center 12 and the pull rod 15, and they are welded together by pins to complete the connection; the center 24 is coaxial with the center of the tapered surface of the live center 12.

[0035] A rectangular notch is opened at one end of the handle 20, and a cylindrical hole is provided at the middle curved portion. The pin b21 is inserted into the cylindrical hole to complete the fixed connection with the movable support 16, so as to realize the rotation of the handle 20;

[0036] A flat is milled on one side of the pull rod 15 to fit into the rectangular notch on the handle 20 to ensure that the pull rod 15 moves axially. When a rotational torque is applied to one end of the handle 20, the torque is transmitted to the live center 12 through the pull rod 15, causing the live center 12 to move axially.

[0037] When measuring, first insert the center 24 into the measured shaft hole, then pull the handle 20 to insert the live center 12 into the other end of the measured shaft; rely on the lever 6 to make the probe 25 abut against the part of the workpiece to be measured, rotate the workpiece, make the probe 25 pass through the part of the workpiece to be measured, and convert the runout of the spline in the shaft into the value change of the dial indicator through the lever 6; one end of the lever 6 is in contact with the dial indicator probe, and the other end hole of the lever 6 is inserted with a measuring lever 11, and the probe 25 is fixed on the measuring lever 11, and the probe 25 is against the spline part of the measured shaft to be measured, and the position of the pitch circle of the spline of the measured shaft contacted by the probe 25 is as shown in FIG. Figure 8 As shown, the runout value is measured, thus achieving synchronous movement of the dial indicator probe and the probe contacting the internal spline, and then obtaining the internal spline runout variable of the measured shaft.

Claims

1. A device for measuring the runout value of spline teeth in shaft hole parts, characterized in that: The invention comprises a base plate (2), a screw plug (3), a spring a (4), a bracket (5), a lever (6), a measuring lever (11), a live center (12), a bushing (13), a pin a (14), a pull rod (15), a movable support (16), a spring b (17), a baffle (18), a handle (20), a center (24), a probe (25), and a top block (27); the base plate (2) and the movable support (16) are slidably matched, the baffle (18) is fixed on the movable support (16), a bushing (13) is installed in a hole of the movable support (16), the live center (12) is installed on the bushing (13), and the live center (12) The lever (16) is fixed to the movable support (16); the bracket (5) is fixed to one side of the bottom plate (2); the lever (6) is fixed to the bracket (5); the lever (6) is pressed against the contact of the dial indicator through the boss; the screw plug (3) and the bracket (5) are connected by threads; a spring (4) is arranged between the top block (27) and the screw plug (3); one side of the measuring lever (11) is connected to the lever (6); the other side passes through the top plate (24) and cooperates with the measuring head (25).

2. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The bottom plate (2) is a plate-like structure, and is provided with two corresponding long holes parallel to the length direction in the middle, which are slidably connected to the movable support (16).

3. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The bottom of the bracket (5) is a rectangular parallelepiped structure, the left end of the upper surface is provided with a fixing plate (5-1), the middle part is provided with a supporting frame (5-2) and a meter frame (5-3); the top (24) is fixedly connected to the tapered hole of the fixing plate (5-1), the lever (6) is installed on the supporting frame (5-2), and the dial indicator head (28) is fixed on the meter frame (5-3).

4. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The lever (6) is a columnar step structure, with a mounting hole at the bottom of one end. The measuring lever (11) is installed in the mounting hole and fixed by a hexagon socket head screw (8). The other end is provided with a boss at the contact position with the dial indicator head (28), and the surface roughness of the boss is 0.8-1.

6.

5. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The live center (12) is a columnar structure with a stepped hole, and the end connected to the measured shaft is conical and matches with the 60° tapered hole of the measured shaft. The stepped hole matches with a pull rod (15) equipped with a spring (17).

6. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The center of the cone surface of the center (24) and the live center (12) are coaxial.

7. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: The spring (17) is HB362-71, with a specification of 1.5×16×40 mm.

8. The device for measuring the runout value of the spline tooth profile in shaft hole parts according to claim 1 is characterized in that: One side of the pull rod (15) is milled with a flattened portion, which fits into a rectangular notch on the handle (20).

9. The measuring method for measuring the runout value of the spline tooth profile in shaft hole parts according to any one of claims 1 to 8, characterized in that: During measurement, the center (24) is first inserted into the hole of the measured shaft, and then the handle (20) is pulled to insert the live center (12) into the other end of the measured shaft; the probe (25) is pressed against the part of the workpiece to be measured by means of a lever (6), and the workpiece is rotated so that the probe (25) passes through the part of the workpiece to be measured, and the runout of the internal spline of the shaft is converted into a numerical change of the dial indicator through the lever (6); one end of the lever (6) is in contact with the dial indicator probe, and a measuring lever (11) is inserted into the hole at the other end of the lever (6), and the probe (25) is fixed on the measuring lever (11), and the probe (25) is pressed against the spline part of the measured shaft to be measured, and the probe (25) contacts the pitch circle position of the spline of the measured shaft, thereby measuring the runout value, and then obtaining the runout variable of the internal spline of the measured shaft.

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