A device for detecting the inner diameter of an automotive differential housing

Abstract

A device for detecting the inner diameter of an automotive differential housing is disclosed. The differential housing has a flange with at least one set of symmetrical mounting holes. A base is included, with two first positioning holes adapted to one set of mounting holes. Connectors passing through the mounting holes and the first positioning holes are provided on the base. The connectors are detachably connected to the base. The upper parts of the two connectors are connected by a portal frame. A detection unit is located at the lower part of a vertical rod. The detection unit includes a probe rod, an inverted conical component, and an infrared ranging device. The probe rod is rotatably connected to the vertical rod. The conical component is sleeved on the outside of the probe rod. The probe rod, conical component, and vertical rod are all coaxially arranged. The conical component has a mounting groove, and the infrared ranging device is correspondingly installed in the mounting groove. This invention allows the conical component to abut against the upper end of the shaft hole by moving it downwards, facilitating the detection of the inner diameter of the shaft hole in the horizontal plane by the two infrared ranging devices when the probe rod is rotated.

Description

Technical Field

[0001] This utility model relates to the field of differential housing drilling technology, specifically a device for detecting the inner diameter of an automotive differential housing. Background Technology

[0002] Measuring the inner diameter of the differential housing's shaft bore is crucial for ensuring its assembly accuracy, operational reliability, and lifespan. Current technology typically involves simple measurements using a handheld micrometer. This method relies entirely on the operator's technique; the force applied and the micrometer's accuracy can significantly affect the reading, leading to substantial errors.

[0003] To improve measurement accuracy, existing technologies include using infrared rangefinders to detect the inner diameter of shaft holes. Specifically, the differential housing is first fixed, then an infrared rangefinder is inserted into the shaft hole via a vertical rod. A rotating rod drives the rangefinder to rotate, and the inner diameter of the shaft hole is measured using the infrared rangefinder. Although infrared rangefinders offer higher measurement accuracy than handheld micrometers, the axis of the vertical rod in existing technologies is difficult to adjust to align with the shaft hole. If it deviates from the axis, the infrared rangefinder will scan an eccentric circle or a non-circular curve, resulting in a significant difference between the measured value and the actual inner diameter. This makes it difficult to accurately and quickly detect the inner diameter of shaft holes in differential housings of the same model. Utility Model Content

[0004] To address the technical problems mentioned above, this utility model provides a device for detecting the inner diameter of an automotive differential housing.

[0005] The technical solution of this utility model is as follows:

[0006] A device for detecting the inner diameter of an automotive differential housing, wherein the differential housing has a flange, the flange has at least one set of symmetrical mounting holes, a base, the base has two first positioning holes adapted to one of the set of mounting holes, the base has a connector that can sequentially pass through the mounting holes and the first positioning holes in the vertical direction, the connector is detachably connected to the base, the upper parts of the two connectors are connected by a portal frame, the upper middle part of the portal frame has a vertically downward extending vertical rod, the position of the vertical rod is adjustable in the horizontal direction, and the lower part of the vertical rod has a detection unit;

[0007] The detection unit includes a probe rod, an inverted conical component, and two symmetrically arranged infrared ranging devices. The probe rod is rotatably connected to the vertical rod, and the conical component is sleeved on the outside of the probe rod. The probe rod, the conical component, and the vertical rod are all coaxially arranged. The conical component has symmetrically opened mounting slots in the radial direction, and the infrared ranging devices are installed in the mounting slots accordingly, with the detection end of the infrared ranging devices set horizontally.

[0008] Furthermore, the portal frame includes a horizontal bar arranged in the horizontal direction and support bars symmetrically arranged at both ends, with the lower part of the support bar being inserted into the upper part of the connector.

[0009] To facilitate the stable insertion of the support rod into the upper part of the connector, a second positioning hole coaxial with it is provided on the upper part of the connector. The lower part of the second positioning hole has a tapered structure, and the lower part of the support rod is adapted to the second positioning hole and inserted into the second positioning hole.

[0010] Preferably, the tapered component is detachably connected to the probe rod by fasteners, the position of the tapered component is adjustable along the length of the probe rod, the infrared ranging device is installed inside the tapered component, and the height of the tapered component is adjustable, so that the height position of the infrared ranging device inside the shaft hole is adjustable, which facilitates the infrared ranging device to detect different positions of the inner diameter of the shaft hole.

[0011] To facilitate the installation of infrared ranging equipment, the mounting groove extends through the tapered component along the axial direction.

[0012] Preferably, the infrared ranging device is detachably connected to the mounting slot via a connecting component, and the position of the infrared ranging device is adjustable in the vertical direction within the mounting slot.

[0013] Furthermore, the upper end of the probe rod is provided with a connecting groove coaxial with it, and the lower end of the vertical rod is provided with a central shaft coaxial with it. The central shaft is rotatably connected to the connecting groove through a bearing.

[0014] Preferably, the upper part of the probe is provided with an adjustment handle.

[0015] The specific structure of the adjustable vertical rod is as follows: the upper part of the vertical rod is provided with a sleeve that is fitted onto the horizontal rod. The sleeve is slidably connected to the horizontal rod. Two sets of adjustment mechanisms are provided on both sides of the sleeve along its axial direction. The adjustment end of the adjustment mechanism can be pressed against the end face of the sleeve in the horizontal direction.

[0016] The beneficial effects of this utility model are as follows:

[0017] When it is necessary to detect the inner diameter of the shaft hole of the differential housing, first set the two opposite mounting holes and the first positioning hole of the differential housing accordingly. The connector fixes the differential housing to the base. The two opposite mounting holes are generally symmetrically opened with respect to the axis of the shaft hole. The vertical rod is installed in the middle position of the horizontal rod, so that the tapered part can move downward and abut against the upper end of the shaft hole. This makes the detection rod, the tapered part and the vertical rod coaxial, so that when the detection rod is rotated, the two infrared ranging devices can detect the inner diameter of the shaft hole in the horizontal plane.

[0018] Two infrared ranging devices can acquire complete circumferential data by rotating half a circle compared to a single infrared ranging device, which can improve the efficiency of shaft hole inner diameter detection. Moreover, the ranging data of a single infrared ranging device will fluctuate periodically and cannot distinguish between the true hole diameter and the eccentricity error. The two infrared ranging devices are symmetrically arranged (180° opposite each other) and collect data synchronously, which can reduce vibration interference during rotation and ensure measurement stability.

[0019] To facilitate the stable insertion of the support rod into the upper part of the connector, a second positioning hole coaxial with it is provided on the upper part of the connector. The lower part of the second positioning hole has a tapered structure. The lower part of the support rod is adapted to the second positioning hole, which facilitates the quick disassembly of the portal support frame and the infrared ranging device connected to it after the inner diameter of the shaft hole of a differential housing has been tested, and the quick installation with the connector to the next differential housing to be tested.

[0020] The two first positioning holes on the base can be set to correspond to the mounting holes of the flange of the differential housing to be tested. The two symmetrically set mounting holes of the flange are usually symmetrically opened with respect to the axis of the shaft hole. Even if there are multiple mounting holes, they are arranged in an even number with equal spacing around the circumference, which facilitates the direct installation and positioning of the differential housing. The vertical rod is installed on the horizontal rod at the position coaxial with the axis of the shaft hole of the differential housing. Differential housings of the same model do not need to adjust the position of the vertical rod and the probe rod, which can realize the function of quick positioning, installation and testing.

[0021] Considering that the machining accuracy of the two mounting holes may have errors, an adjustment mechanism is set up to adjust the position of the vertical rod, and then adjust the tapered part to the preset position so that the two infrared ranging devices inside can detect normally. Attached Figure Description

[0022] In the attached diagram:

[0023] Figure 1 This is a structural diagram;

[0024] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 3 This is a top view;

[0026] Figure 4 for Figure 3 A schematic diagram of the AA-direction cross-section structure;

[0027] Figure 5 This is a schematic diagram of the detection unit structure;

[0028] The components represented by the various reference numerals in the diagram are:

[0029] 1. Differential housing; 101. Flange; 102. Mounting hole; 2. Base; 201. First positioning hole; 3. Connecting piece; 301. Second positioning hole; 4. Portal support frame; 401. Horizontal bar; 402. Support bar; 5. Vertical bar; 501. Central shaft; 6. Detection unit; 601. Detector rod; 6011. Connecting groove; 602. Conical piece; 6021. Mounting groove; 6022. Adjustment hole; 603. Infrared ranging device; 7. Bearing; 8. Adjusting handle; 9. Sleeve; 10. Adjustment mechanism; 1001. Base; 1002. Adjusting bolt; 1003. Circular plate; 11. Connecting plate; 12. Fastening bolt. Detailed Implementation

[0030] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, an automotive differential housing inner diameter detection device is disclosed. The differential housing 1 has a flange 101, and the flange 101 has at least one set of symmetrical mounting holes 102. In the prior art, the flange 101 is generally provided with an even number of mounting holes 102, such as 6 or 8, at equal intervals along its circumference. The vertical connection line between two symmetrical mounting holes 102 is perpendicular to the axis of the differential housing shaft hole. The automotive differential housing inner diameter detection device includes a base 2, on which two first positioning holes 201 are provided to be adapted to one of the set of mounting holes 102. The base 2 is provided with a connector 3 that can sequentially pass through the mounting holes 102 and the first positioning holes 201 in the vertical direction. The connector 3 is detachably connected to the base 2. The upper parts of the two connectors 3 are connected by a portal frame 4. A vertical rod 5 extending vertically downward is provided at the middle position of the upper part of the portal frame 4. The position of the vertical rod 5 is adjustable in the horizontal direction. A detection unit 6 is provided at the lower part of the vertical rod 5.

[0031] The first mounting hole 102 can be a threaded hole. The lower part of the connector 3 is provided with a threaded section. The connector 3 passes through the mounting hole 102 and its lower part is threadedly connected to the base 2, which can fix the differential housing 1 on the base 2.

[0032] The detection unit 6 includes a detection rod 601, an inverted conical part 602, and two symmetrically arranged infrared ranging devices 603. The detection rod 601 is rotatably connected to the vertical rod 5. The bottom diameter of the conical part 602 is smaller than the top diameter. The bottom of the conical part 602 is a conical tip. The maximum outer diameter of the upper part of the conical part 602 is larger than the inner diameter of the shaft hole of the differential housing 1 to be tested.

[0033] See Figure 5As shown, the conical part 602 is sleeved on the outside of the detection rod 601. The detection rod 601, the conical part 602 and the vertical rod 5 are all coaxially arranged. The conical part 602 has symmetrically opened mounting grooves 6021 in the radial direction. The infrared ranging device 603 is installed in the mounting groove 6021, and the detection end of the infrared ranging device 603 is set horizontally. In order to facilitate the installation of the infrared ranging device 603 and the adjustment of the height position of the infrared ranging device 603, the mounting groove 6021 passes through the conical part 602 in the axial direction.

[0034] It should be noted that the infrared ranging device 603 can be an infrared rangefinder, which is existing technology.

[0035] The portal frame 4 includes a horizontal rod 401 arranged in the horizontal direction and support rods 402 symmetrically arranged at both ends. The horizontal rod 401 is a shaft, and the lower part of the support rod 402 is inserted into the upper part of the connector 3. To facilitate the stable insertion of the support rod 402 into the upper part of the connector 3, a second positioning hole 301 coaxial with it is provided on the upper part of the connector 3. The lower part of the second positioning hole 301 has a tapered structure, and the lower part of the support rod 402 is adapted to the second positioning hole 301 and inserted into the second positioning hole 301.

[0036] The tapered part 602 is detachably connected to the probe rod 601 by fasteners. The position of the tapered part 602 along the length of the probe rod 601 is adjustable. The infrared ranging device 603 is installed inside the tapered part 602. The height of the tapered part 602 is adjustable, so that the height of the infrared ranging device 603 inside the shaft hole is adjustable, which facilitates the infrared ranging device 603 to detect different positions of the inner diameter of the shaft hole.

[0037] See Figure 5 As shown, the infrared ranging device 603 is detachably connected to the mounting groove 6021 via a connecting assembly, and the position of the infrared ranging device 603 within the mounting groove 6021 is adjustable in the vertical direction. The connecting assembly includes a connecting plate 11, which is connected to the housing of the infrared ranging device 603 via a connecting structure. The connecting plate 11 is installed in the mounting groove 6021 via fastening bolts 12 and other connecting structures. Multiple adjustment holes 6022 can be provided in the mounting groove 6021 in the vertical direction for adjusting the height of the infrared ranging device 603. When adjusting the height of the infrared ranging device 603, the fastening bolts 12 and other connecting structures are connected to the adjustment holes 6022, so that the detection end of the infrared ranging device 603 is horizontally positioned, enabling the detection end of the infrared ranging device 603 to detect the inner wall of the shaft hole.

[0038] The upper end of the probe rod 601 has a connecting groove 6011 coaxial with it, and the lower end of the vertical rod 5 has a central shaft 501 coaxial with it. The central shaft 501 is rotatably connected to the connecting groove 6011 through a bearing 7. The upper part of the probe rod 601 has an adjustment handle 8. By rotating the adjustment handle 8, the probe rod 601, the tapered part 602 and the infrared ranging device 603 can be rotated, so that the detection end of the infrared ranging device 603 can detect the inner diameter of the shaft hole in a horizontal plane.

[0039] The two first positioning holes 201 on the base 2 can be set to correspond to the mounting holes 102 of the flange 101 of the differential housing 1 to be tested. The two symmetrically arranged mounting holes 102 of the flange 101 are usually symmetrically opened with respect to the axis of the shaft hole. Even if there are multiple mounting holes 102, they are arranged in an even number at equal intervals around the circumference, which facilitates the direct installation and positioning of the differential housing 1. The vertical rod 5 is installed on the horizontal rod 401 at a position coaxial with the axis of the shaft hole of the differential housing 1. Differential housings of the same model do not need to adjust the position of the vertical rod 5 and the probe rod 601, which can realize the function of quick positioning, installation and testing.

[0040] See Figure 2 and Figure 4 As shown, considering the potential errors in the machining accuracy of the two mounting holes 102, an adjustment mechanism 10 is provided to adjust the position of the vertical rod 5, thereby adjusting the tapered part 602 to a preset position to facilitate the normal detection of the two infrared ranging devices 603 inside. Specifically, a sleeve 9 is provided on the upper part of the vertical rod 5, which is fitted onto the horizontal rod 401. The inner diameter of the sleeve 9 is adapted to the outer diameter of the horizontal rod 401, and the sleeve 9 slides with the horizontal rod 401. Two sets of adjustment mechanisms 10 are provided on both sides of the sleeve 9 along its axial direction. The adjustment end of the adjustment mechanism 10 can be pressed against the end face of the sleeve 9 in the horizontal direction. The adjustment mechanism 10 includes a base 1001 provided on the horizontal rod 401. The base 1001 has a threaded hole in the horizontal direction, and an adjustment bolt 10 is threaded into the threaded hole. 02. The adjusting bolt 1002 has an adjusting end, and the end face of the adjusting end is provided with a circular plate 1003. The adjusting end is close to the end face of the corresponding sleeve 9. When the adjusting bolt 1002 is turned, the circular plate 1003 on the adjusting end can move closer to or away from the end face of the sleeve 9. When it moves closer to and presses against the end face of the sleeve 9, it can adjust the position of the sleeve 9. When adjusting the position of the sleeve 9, the adjusting end of one adjusting bolt 1002 moves away from the sleeve 9, and the adjusting end of the other adjusting bolt 1002 presses against the sleeve 9.

Claims

1. A device for detecting the inner diameter of an automotive differential housing, wherein the differential housing (1) has a flange (101), and the flange (101) is provided with at least one set of symmetrical mounting holes (102), characterized in that, Includes a base (2), on which are provided two first positioning holes (201) adapted to one of the mounting holes (102), and on which are provided a connector (3) that can sequentially pass through the mounting hole (102) and the first positioning hole (201) in the vertical direction. The connector (3) is detachably connected to the base (2). The upper parts of the two connectors (3) are connected by a portal frame (4). The upper middle part of the portal frame (4) is provided with a vertical rod (5) extending vertically downward. The position of the vertical rod (5) is adjustable in the horizontal direction. The lower part of the vertical rod (5) is provided with a detection unit (6). The detection unit (6) includes a probe rod (601), an inverted conical piece (602), and two symmetrically arranged infrared ranging devices (603). The probe rod (601) is rotatably connected to the vertical rod (5). The conical piece (602) is sleeved on the outside of the probe rod (601). The probe rod (601), the conical piece (602), and the vertical rod (5) are all coaxially arranged. The conical piece (602) has symmetrically opened mounting slots (6021) in the radial direction. The infrared ranging devices (603) are installed in the mounting slots (6021) and the detection end of the infrared ranging devices (603) is horizontally arranged.

2. The device for detecting the inner diameter of an automotive differential housing according to claim 1, characterized in that, The portal frame (4) includes a horizontal rod (401) arranged in the horizontal direction and support rods (402) symmetrically arranged at both ends. The lower part of the support rod (402) is inserted into the upper part of the connector (3).

3. The device for detecting the inner diameter of an automotive differential housing according to claim 2, characterized in that, The upper part of the connector (3) is provided with a second positioning hole (301) coaxial with it. The lower part of the second positioning hole (301) is a tapered structure. The lower part of the support rod (402) is adapted to the second positioning hole (301) and inserted into the second positioning hole (301).

4. The device for detecting the inner diameter of an automotive differential housing according to claim 1, characterized in that, The tapered component (602) is detachably connected to the probe rod (601) by fasteners, and the position of the tapered component (602) along the length direction of the probe rod (601) is adjustable.

5. The device for detecting the inner diameter of an automotive differential housing according to claim 1, characterized in that, The mounting groove (6021) passes through the tapered member (602) along the axial direction.

6. The device for detecting the inner diameter of an automotive differential housing according to claim 5, characterized in that, The infrared ranging device (603) is detachably connected to the mounting slot (6021) via a connecting component, and the position of the infrared ranging device (603) in the mounting slot (6021) is adjustable in the vertical direction.

7. The device for detecting the inner diameter of an automotive differential housing according to claim 1, characterized in that, The upper end of the probe rod (601) is provided with a connecting groove (6011) coaxial with it, and the lower end of the vertical rod (5) is provided with a central shaft (501) coaxial with it. The central shaft (501) is rotatably connected to the connecting groove (6011) through a bearing (7).

8. The device for detecting the inner diameter of an automotive differential housing according to claim 1, characterized in that, The upper part of the probe rod (601) is provided with an adjustment handle (8).

9. The device for detecting the inner diameter of an automotive differential housing according to claim 2, characterized in that, The upper part of the vertical rod (5) is provided with a sleeve (9) sleeved on the horizontal rod (401). The sleeve (9) is slidably connected to the horizontal rod (401). The sleeve (9) is provided with two sets of adjustment mechanisms (10) on both sides along its axial direction. The adjustment end of the adjustment mechanism (10) can be pressed against the end face of the sleeve (9) in the horizontal direction.

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