An on-line measuring device for the chamfer of differential gear spline inner hole

Abstract

The application relates to an on-line measuring device for the chamfer of the gear spline inner hole of a differential gear, relates to the angle measuring technical field, and solves the problems of long measuring time of the chamfer of the gear spline inner hole of the differential gear, and the incapability of meeting the on-line production requirements, etc. The device integrates a measuring head and a lever on a measuring support to form an integrated structure, the measuring head is used as a fixed positioning point to position an angle surface, and the measuring head on the lever is used as a movable measuring point to measure the angle change; the distance between the positioning point and the movable measuring point is 1.72 mm; the bottom plate is inclined by 67.5 DEG, a groove for mounting the measuring support is processed on the bottom plate, the measuring support is inclined by 67.5 DEG with the bottom plate; a positioning groove is processed in the large end shaft diameter of the positioning seat and is used for sliding cooperation with the measuring support, and the small end shaft diameter is used for positioning the spline inner hole of the measured product; a display device is connected with the other end of the lever through a measuring point transmission, and is used for displaying the angle change measured by the movable measuring point. The device is simple in on-line measuring operation, fast, accurate and stable in measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of angle measurement, in particular to an online measurement device for chamfer of differential gear spline inner hole. BACKGROUND

[0002] In the automobile manufacturing industry, the differential is one of the most important components, and 99% of the cars are based on the differential to travel, so the quality of the differential directly affects the problem of whether the car can travel. The structure of the differential is composed of a differential housing, gears, planetary gears and a gear ring, and the gears and planetary gears are bevel gears. Since the differential is a ball cage structure, the gears and planetary gears are installed inside, two gears are on one axis, and the planetary gears are on the other axis, the two shafts are perpendicular to each other, and any gear is meshed with two planetary gears. Because the surface contacted by the planetary gear and the differential housing is a spherical surface, and the gear is a bevel gear, the two pairs of gears and planetary gears meshing inside the differential are called bevel gears. The inner hole of the gear is an inner spline hole, which transmits power to the automobile wheels through the connection with the spline shaft. In the connection between the spline hole and the spline shaft, the spline hole has a guide angle (matched with the spline shaft) at the end. The angle of the guide angle must be ensured in the production and manufacturing.

[0003] In the prior art, the differential production is basically customized for automobiles, so its production attribute is large-scale automatic production. The processing time of a gear may be one minute. According to the traditional method, the angle is detected by three-coordinate or profile gauge equipment. The detection time is about ten minutes when the detection equipment has no other measurement operation tasks, but when the detection equipment has other measurement operation tasks, the detection time cannot be determined. The production of the differential needs to be stopped when the measurement result is not finally determined, which causes economic losses that the production manufacturer cannot accept. Therefore, a measurement device capable of rapid detection within one minute is one of the optimal selection schemes at present.

[0004] In summary, the existing three-coordinate or profile gauge equipment is used to detect the angle of the guide angle. These devices need a relatively long detection time and cannot meet the online production requirements. Therefore, it is urgent to develop a universal inner hole angle measurement device. SUMMARY

[0005] The present application provides an online measurement device for chamfer of differential gear spline inner hole to solve the problems of long measurement time and inability to meet the online production requirements of the existing differential gear spline inner hole chamfer.

[0006] An online measurement device for chamfer of differential gear spline inner hole, the online measurement device comprises a bottom plate, a measurement support, a measurement head, a positioning seat, a lever and a display device.

[0007] The measuring head and the lever are installed on the measuring support to form an integrated structure, the measuring head serves as a fixed positioning point to position the angle surface, and the measuring head on the lever serves as a movable measuring point to measure the change of the angle surface; the distance between the positioning point and the movable measuring point is 1.72 mm;

[0008] The bottom plate is arranged to be inclined by 67.5°; a groove is processed on the bottom plate for installing the measuring support, and the measuring support is arranged to be inclined by 67.5° relative to the bottom plate;

[0009] The positioning seat is arranged as a stepped shaft structure, a large end shaft diameter is processed with a positioning groove for sliding fit with the measuring support, and a small end shaft diameter is used for positioning the spline inner hole of the measured product;

[0010] The display device is connected with the other end of the lever to transmit the measuring point, and is used for displaying the angle change measured by the movable measuring point.

[0011] The online measuring device has the following beneficial effects:

[0012] The online measuring device disclosed by the application installs the fixed measuring head on the measuring support and installs the movable measuring point measuring head through the lever, so that the distance between the measuring head and the movable measuring point is 1.72 mm, and the instability caused by the non-integrated installation of the two measuring points is avoided to affect the measurement result.

[0013] The online measuring device disclosed by the application designs the measuring support, the measuring head and the lever as an integrated structure, so that the positional relationship between the measuring head and the movable measuring point on the lever is fixed, the two measuring points are integrated on one component and have good integrity, the two measuring points are installed on the bottom plate, the distance between the two measuring points is 1.72 mm and does not change after installation, and the measurement accuracy is ensured.

[0014] The online measuring device disclosed by the application designs the measuring support with a thickness of 12 mm, the size is matched with the width of the positioning groove in the center of the positioning seat, and the measurement result of the normal angle of the taper hole is ensured.

[0015] The online measuring device disclosed by the application can be applied to the chamfer angle measurement of the inner spline hole of different measured product pieces. According to the different chamfer surface length and angle of different measured product pieces, the measuring point needs to avoid the tooth groove position, a corresponding positioning seat is designed for each different measured product piece, a positioning pin hole with a positioning tooth groove is installed on the positioning seat, the fixed point measuring head and the movable measuring point can fall on the inner hole surface of the cone, and the measurement point can measure the angle of the center surface.

[0016] The online measuring device disclosed by the application adopts the low-carbon steel carburizing and quenching process for the bottom plate, the surface of the bottom plate has high hardness, the center part is soft, the center part has good machinability, the bottom plate is processed with a certain inclination angle, and the operator is convenient to operate.

[0017] The online measurement device described in this invention is simple to operate, fast, accurate and stable in online measurement. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an online measuring device for the chamfering of the spline inner hole of a differential gear according to the present invention;

[0019] Figure 2 In order to be in Figure 1 A structural diagram showing the addition of the tested product component;

[0020] Figure 3 A schematic diagram illustrating the principle of measuring the chamfer of the inner hole of the differential spline;

[0021] Figure 4 This is the front view of the base plate;

[0022] Figure 5 This is a top view of the base plate;

[0023] Figure 6 This is the front view of the measuring support;

[0024] Figure 7 for Figure 6 The left view;

[0025] Figure 8 for Figure 6 The right view;

[0026] Figure 9 This is a schematic diagram of the lever structure;

[0027] Figure 10 This is a schematic diagram of the probe's structure;

[0028] Figure 11 A schematic diagram showing the structure for mounting the probe and lever on the measuring support;

[0029] Figure 12 This is the front view of the positioning seat;

[0030] Figure 13 for Figure 12 Side view;

[0031] Figure 14 for Figure 12 Top view.

[0032] In the figure: 1, the support plate, 2, the base plate, 2-1, the groove, 3, the measuring support, 3-1, the mounting hole, 3-2, the fixing hole, 3-3, the pin hole, 3-4, the through hole, 3-5, the M4 screw hole, 3-6, the locking hole, 4, the measuring head, 5, the positioning seat, 5-1, the positioning groove, 5-2, the positioning pin hole, 5-3, the positioning measuring head, 5-4, the threaded locking hole, 6, the measured product, 7, the lever, 7-1, the movable measuring point, 7-2, the transmission measuring point, 8, the micrometer. DETAILED DESCRIPTION

[0033] Combination Figure 1 The present embodiment is an on-line measuring device for the chamfer angle of the differential gear spline inner hole, which can be used as a general inner hole angle measuring device.

[0034] The chamfer angle of the differential spline inner hole of different measured products is different, generally in the range of 15° to 30°, and the angle tolerance range of the same product is required to be ±0.5° to ±3°; the chamfer angle of different measured products is different, and the length of the chamfer angle surface is in the range of 2.5mm to 6mm; the inner hole of the gear is a spline hole; the chamfer angle surface is not a continuous surface, and the measuring point must avoid the inner spline tooth groove position during measurement to ensure the accuracy of the measurement; the size of the spline inner hole of different measured products is different, and the inner hole diameter is in the range of 24mm to 50mm.

[0035] The present embodiment is designed for the above characteristics of the chamfer angle of the spline inner hole, and a fixed positioning point is designed, and then an active measuring point is designed to rotate around the positioning point; when the distance between the two points is 1.72mm, the positioning point is fixed, and the active measuring point rotates 1° around the fixed positioning point, and the displacement arc length of the active measuring point is 0.03mm, i.e. 30μm, when the central angle corresponding to this arc is relatively small (the arc angle of this arc is small), the arc length corresponding to any 1′ angle in this angle is theoretically equal, i.e. for 0° to 1° arc length in Y axis direction size change and 9° to 10° arc length in Y axis direction size change as Figure 3 shown, one is 0.03001mm, and the other is 0.02956mm, and both can be considered equal, and when the micrometer measures the central angle of the two arc lengths, each minute change is also the same, and the error is too small to be distinguished. Therefore, the angle value can be measured by using the micrometer or displacement sensor to measure the displacement change of the active point, and a corresponding calibration piece is needed for measurement to mark the standard angle, and a positioning seat with a corresponding angle is also needed for different measured products, and the active measuring point displacement is 1μm, i.e. 1 / 30 of 1°, and the display angle change is 2′.

[0036] The online measuring device of the embodiment adopts a measuring mode based on a micrometer and a sensor, is collection and measurement of linear displacement amount change, and displays size change in the Y-axis direction. Therefore, a measuring support 3 is designed, a fixed probe 4 is installed on the measuring support 3, and a probe of a movable measuring point is installed through a lever 7. In this way, the distance between the fixed probe 4 and the movable measuring point is 1.72 mm, and the instability caused by non-integrated installation is avoided to affect the measurement result.

[0037] As shown in Figure 1 and Figure 2 , the online measuring device of the embodiment includes a support plate 1, a bottom plate 2, a measuring support 3, a probe 4, a positioning seat 5, a lever 7, and a micrometer 8.

[0038] As shown in Figures 4 to 11 , the bottom plate 2 is installed on the support plate 1 at an inclination of 67.5°, a groove 2-1 is processed on the bottom plate 2, the measuring support 3 is fixedly connected with the groove 2-1 and is also inclined at an angle of 67.5° with the bottom plate 2, the length of the groove is 35 mm, and the width is 12 mm, which is gapless with the width and thickness of the measuring support 3. The inclination of the groove 2-1 with the bottom plate 2 at 67.5° mainly depends on the half angle of the taper hole of the measured product 6 being 15° to 30°. When the taper angle is 22.5°, the corresponding relationship of the probe 4 and the movable measuring point of the lever 7 is 0°, and the corresponding angle relationship of the measuring points of the probe 4 and the lever 7 is ±7.5° when the taper angle is 15° and 30°. In this way, the arc length of the Y-axis projection value is also the sine value, which can be as equal as possible. In addition, the distance between the center of the movable measuring point 7-1 of the lever 7 and the bottom plate 2 is 20 mm. Since the measuring device of the embodiment is a general type, it can adjust the measuring position according to different measured products 6. When the measuring angle of the measured product 6 is high, the measuring can be realized by thinning the end face of the positioning seat 5. There are two ø6 pin holes on the bottom plate 2 for fastening the bottom plate 2 and the measuring support 3 as a whole structure.

[0039] As shown in Figures 6 to 8 , the measuring support 3 is provided with a mounting hole 3-1 for installing the probe 4 and a fixed hole 3-2 fixed by an M4 screw; a pin hole 3-3 and a locking hole 3-6 for installing the lever 7; a through hole 3-4 for installing a display device, and an M4 screw hole 3-5 for fixing the display device on one side of the measuring support 3 perpendicular to the through hole;

[0040] As shown in Figures 9 to 11As shown, the probe 4 is mounted on the measuring support 3 through the mounting hole 3-1 and fixed by passing an M4 screw through the fixing hole; the lever 7 is mounted on the measuring support 3 through the pin hole 3-3. When the distance between the probe 4 and the movable measuring point 7-1 on the lever 7 is 1.72mm, it is locked by the locking hole 3-6. The probe 4 and the lever 7 are mounted on the measuring support 3 and form an integral structure with the measuring support 3.

[0041] In this embodiment, the probe 4 serves as a fixed positioning point on the angular plane, and the probe on the lever 7 serves as a movable measuring point 7-1 to measure the change in the angular plane. The 1.72mm is obtained through theoretical calculation. 1° equals 60′, and a circular angle is 360°. Assuming that 1′ corresponds to an arc length of 1μm, the circumference is equal to 0.001×60×360=21.6, and the radius is equal to 21.6÷2π=3.438. Half of the radius is 1.72mm.

[0042] like Figures 12 to 14 As shown, the positioning seat 5 is configured as a stepped shaft structure. A positioning groove 5-1, 12mm wide, is machined into the large end of the shaft diameter to allow for sliding clearance with the thickness of the measuring support 3. The positioning groove 5-1 ensures that the movable measuring point 7-1 of the probe 4 and lever 7 can penetrate into the tapered hole of the tested product part 6 to measure the chamfer angle, while also ensuring the measurement of the normal angle through the center. The small end diameter is used to position the spline inner hole of the tested product part 6, and a positioning pin hole 5-2 through the center is located on the small end shaft diameter. A positioning probe 5-3 with a positioning spline tooth groove is installed inside the positioning pin hole 5-2. A threaded locking hole is machined on the small end shaft diameter on the other side perpendicular to the positioning pin hole 5-2. A screw is used to lock the probe through the threaded locking hole 5-4, thus completing the positioning of the product part 6 under test. When the number of teeth on the product part 6 under test is even, the axis of the positioning pin hole 5-2 is parallel to the center plane of the positioning groove 5-1. When the number of teeth on the product part 6 under test is odd, the axis of the positioning pin hole 5-2 is inclined relative to the center plane of the positioning groove 5-1. Because it is a tapered hole machined from a spline hole, the measurement point must avoid the spline tooth groove. The diameter of the positioning seat 5 depends on the size of the spline hole of the product part under test. Therefore, a corresponding positioning seat is required for different product parts under test (the calibration parts for the calibration angle are shared).

[0043] In this embodiment, the display device includes a dial indicator or a sensor device;

[0044] When using a dial indicator 8 to display the measured angle, the dial indicator 8 rod passes through the through hole 3-4 of the measuring support 3 and abuts against the other end of the lever 7, the measuring point 7-2. The lever 7 adopts an isosceles right triangle structure, so that the angle change value measured by the moving measuring point 7-1 is proportionally displayed through the measuring point 7-2 at the end of the dial indicator 8.

[0045] The measurement principle of the online measurement device of the embodiment is as follows:

[0046] During measurement, the large end shaft diameter of the positioning seat 5 is placed on the measurement support 3, and the positioning groove 5-1 in the center of the large end shaft diameter ensures that the measuring head 4 and the movable measuring point 7-1 of the lever 7 are inserted into the tapered hole to measure the angle of the tapered hole, and at the same time, the perpendicular angle of the center passing measurement is ensured.

[0047] When the angle of the measured product 6 changes from 15° to 30°, the middle angle is 22.5°, therefore, the measurement support 3 is installed on the base plate 2 at an angle of 67.5°, at this time, the two measuring points on the measuring head 4 and the lever 7 installed on the measurement support 3 are theoretically measuring the value of 0° angle when measuring the 22.5° hole (half angle), in this way, the two points on the measuring head 4 and the lever 7 are 0° to ±7.5° apparent value changes when measuring the angle from 15° to 30°, 22.5° corresponds to 0°, 15° and 30° correspond to 7.5° apparent value changes.

[0048] When the spline inner hole of the measured product 6 is fixed on the small end shaft diameter of the positioning seat 5, the distance between the two measuring points is 1.72mm, and the locking is achieved through the locking hole 3-6, at this time, the lever 7 transmits the relative changes of the two measuring points to the micrometer 8, at this time, the measurement result of the angle displayed on the micrometer 8 is 2' per 1μm of the micrometer, assuming that the micrometer is set to 0 by using the 15° calibration piece, the angle of the measured product 6 is 17°36', and the apparent value of the micrometer is 78μm, if the angle of the measured product 6 is 25°15', the apparent value of the micrometer 8 is 307μm or 308μm, if the micrometer 8 is replaced by a sensor device, the actual angle value can be displayed through software programming, the display is 15° by using the 15° calibration piece, when the angle of the measured product 6 is 17°36', the display screen of the sensor device displays 17.6° or 17°36', similarly, when the angle of the measured product 6 is 25°15', the display screen of the sensor device displays 25.2° or 25°15'.

[0049] The online measurement device of the embodiment can be applied to the chamfer angle measurement of the spline inner hole of different measured products. Since the chamfer surface length of different measured products is different, the angle is different, and the measuring point needs to avoid the tooth groove position and other problems, a corresponding positioning seat 5 is designed for each different measured product, and a positioning measuring head 5-3 with a positioning tooth groove is installed on the positioning seat 5, which can ensure that the fixed point measuring head 4 and the movable measuring point 7-1 fall on the inner conical hole surface, and at the same time, it also ensures that the measuring point measures the angle of the center passing surface. The diameter of the positioning seat 5 depends on the size of the spline hole of the measured product.

[0050] In the embodiment, the bottom plate 2 is made of low carbon steel and is processed by carburizing and quenching, so that the surface of the bottom plate has high hardness and the center of the bottom plate is soft, the center of the bottom plate has good machinability, the bottom plate 2 is processed to have a certain inclination angle, and the operator is convenient to operate.

[0051] In the embodiment, the measuring support 3, the measuring head 4 and the lever 7 are designed as an integrated structure, so that the position relationship between the movable measuring points on the measuring head 4 and the lever 7 is fixed, that is, the distance between the two measuring points is 1.72 mm, and the lever 7 transmits the relative change of the two measuring points to the micrometer or the sensor. Since the two measuring points are integrated on one component and have good integrity, the two measuring points are convenient to install on the bottom plate 2, the distance between the two measuring points is 1.72 mm after installation and will not change, and the measurement accuracy is ensured. The thickness of the measuring support 3 is designed to be 12 mm, which matches the center positioning groove of the positioning seat 5, and ensures the measurement result of the normal angle of the tapered hole.

[0052] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

[0053] The above-described embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An on-line measuring device for the chamfer of the differential gear spline bore, characterized in that: The online measuring device comprises a base plate (2), a measuring support (3), a measuring head (4), a positioning seat (5), a lever (7) and a display device; The measuring head (4) and the lever (7) are installed on the measuring support (3) to form an integrated structure, the measuring head (4) is positioned as a fixed positioning point to position the angle surface, and the measuring head on the lever (7) is positioned as a movable measuring point (7-1) to measure the change of the angle surface; the distance between the positioning point and the movable measuring point (7-1) is 1.72 mm; The base plate (2) is inclined by 67.5°; a groove (2-1) is formed on the base plate (2) for installing the measuring support (3), and the measuring support (3) is inclined by 67.5° relative to the base plate (2); The positioning seat (5) is provided in a stepped shaft structure, a large end shaft diameter is provided with a positioning groove (5-1) for sliding fit with the measuring support (3), and a small end shaft diameter is used for positioning the spline inner hole of the measured product part; The display device is connected with the other end transmission measuring point (7-2) of the lever (7) for displaying the angle change measured by the movable measuring point (7-1).

2. The online differential gear spline bore chamfer measuring device according to claim 1, wherein: The length of the groove (2-1) on the base plate (2) is 35 mm, and the width is 12 mm, which is used for gapless fit with the width and thickness of the measuring support (3).

3. The online differential gear spline bore chamfer measuring device of claim 1, wherein: The measuring support (3) is provided with a mounting hole (3-1) for installing the measuring head (4) and a fixed hole (3-2) fixed by an M4 screw, a pin hole (3-3) and a locking hole (3-6) for installing the lever (7), a through hole (3-4) for installing the display device and an M4 screw hole (3-5) for fixing the display device.

4. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: The display device comprises a micrometer (8) or a sensor device; When the micrometer (8) is used for measuring and displaying the angle, the dial stem of the micrometer (8) penetrates through the through hole (3-4) of the measuring support (3) and abuts against the other end transmission measuring point (7-2) of the lever (7), and the angle change value measured by the movable measuring point (7-1) is transmitted to the micrometer (8) end through the transmission measuring point (7-2) for display in a proportional manner.

5. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: The width of the positioning groove (5-1) of the positioning seat (5) is 12 mm, which is used for sliding fit with the thickness of the measuring support (3) and makes the movable measuring point (7-1) of the measuring head (4) and the lever (7) probe into the spline hole of the measured product part (6) for measuring the chamfer angle.

6. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: A positioning pin hole (5-2) is arranged on the small end shaft diameter of the positioning seat (5) and a positioning measuring head (5-3) for positioning the tooth groove of the measured product part (6) is arranged in the positioning pin hole (5-2).

7. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: The distance from the center of the movable measuring point of the lever (7) to the base plate (2) is 20 mm; and the lever (7) adopts an isosceles right triangle structure.

8. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: The online measuring device is provided with corresponding positioning seats (5) for measuring different measured product parts (6), and the diameter of the positioning seat (5) depends on the size of the spline inner hole of the measured product part (6).

9. The on-line differential gear spline bore chamfer measuring device of claim 1, wherein: The online measuring device measures the measured product piece (6) with an angle changing from 15° to 30°, and when the middle angle is 22.5°, the corresponding angle relation of the movable measuring point of the probe (4) and the lever (7) is 0°, and when the corresponding angle is 15° and 30°, the corresponding angle relation of the movable measuring point of the probe (4) and the lever (7) is ±7.5°.

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