Transmission housing bearing bore end face distance measuring device and method of use

Abstract

The present application relates to a transmission housing bearing hole end face distance measuring device and method, including base, which is installed on the pedestal, the front side of the pedestal is installed lifting plate, the lifting plate is driven by lifting mechanism to move up and down relative to the pedestal, the front side of the lifting plate is installed L type structure supporting seat which is arranged forward, the supporting seat is installed measuring mechanism; The lifting mechanism drives the lifting plate, the measuring mechanism and the supporting seat to descend; The bottom end of the pre-positioning pin is close to and inserted into the positioning hole of the top surface of the measured housing; The unlocking locking mechanism is limited to the floating seat, the pre-positioning pin is inserted into the positioning hole of the top surface of the measured housing to complete the pre-positioning; The clamping mechanism hooks up and clamps the measured housing from bottom to top, and the positioning hole of the measured housing enters the positioning pin of the profiling sleeve at the same time. At this time, the measuring head is triggered to measure the end face of the bearing hole of the measured housing, and the automatic and rapid measurement of the distance between the end face of the bearing hole of the measured housing and the bottom surface of the measured housing is completed, which is accurate, reliable and stable, and greatly helps the selection of pads.

Description

Technical Field

[0001] This invention relates to the field of transmission measurement equipment technology, and in particular to a device for measuring the distance between the end faces of the bearing holes in a transmission housing and its usage method. Background Technology

[0002] The assembly quality of a vehicle's transmission directly affects its service life and performance. The axial clearance between the transmission shafts and the housing is adjusted using shims to ensure the normal operation of all transmission components. Accurately selecting the shim thickness is crucial for ensuring transmission assembly quality, and the selection of shim thickness depends on the accurate measurement of the transmission shaft height.

[0003] After the gearbox housing is machined, it is necessary to strictly control all key dimensions of the housing. In particular, the distance from the bearing hole end face to the housing end face needs to be accurately measured to match the subsequent shim selection operation.

[0004] In existing technologies, the measurement of transmission housings is sometimes carried out manually offline due to cost considerations. This method is not only inefficient but also physically demanding for operators. Other methods use a six-axis robot to grab the housing online and measure it off-line using specialized testing equipment. However, this method has high overall equipment costs, and off-line measurements often require stricter control of measurement time to adapt to the production cycle. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured device and method for measuring the distance between the bearing hole end face of the gearbox housing and the bottom surface of the housing. This device enables online, automatic, and rapid measurement of the distance between the bearing hole end face and the bottom surface of the housing, ensuring accuracy, reliability, and stability, and greatly assisting in the selection of bearing pads.

[0006] The technical solution adopted in this invention is as follows:

[0007] A device for measuring the distance between the bearing bore end face of a transmission housing includes a base, a stand mounted on the base, a lifting plate slidably mounted on the front side of the stand, the lifting plate being driven by a lifting mechanism to move up and down relative to the stand, and a support seat arranged in an L-shape facing forward mounted on the front side of the lifting plate, with a measuring mechanism mounted on the support seat.

[0008] The measuring mechanism comprises a floating seat, with floating mechanisms installed at each of the four corners. The floating seat is supported on the top surface of a support base by the floating mechanisms, which release the floating seat's degree of freedom of floating relative to the support base in the horizontal plane. A locking mechanism is installed on the floating seat to restrict and lock the floating seat's floating relative to the support base. The support base is vertically connected in the middle, and a contoured sleeve extends downward through the bottom surface of the floating seat, with a pre-positioning pin installed on the bottom surface of the contoured sleeve. A measuring head is installed on the bottom surface of the floating seat located inside the contoured sleeve, and a clamping mechanism is installed on the floating seat located circumferentially outside the contoured sleeve.

[0009] As a further improvement to the above technical solution:

[0010] The clamping mechanism is arranged in three sets at intervals along the circumference of the conforming sleeve. The structure of a single clamping mechanism is as follows: a clamping cylinder with its output end facing down is installed on the top surface of the floating seat. A pull rod is installed on the output end of the clamping cylinder. A clamping arm is rotatably installed after the bottom end of the pull rod extends downward out of the floating seat. A swing rod is rotatably installed in the middle of the clamping arm. The end of the swing rod is rotatably installed on the bottom surface of the floating seat. The swing rod is located between the conforming sleeve and the pull rod.

[0011] The bottom end of the prepositioning pin has a downward-facing conical structure, and the top end of the prepositioning pin passes through a contour sleeve and a floating seat in sequence. A pin cylinder with a central vertical penetration is installed on the top surface of the floating seat. The upper part of the prepositioning pin is movably fitted in the pin cylinder. An elastic element and a limiting element are installed in sequence inside the pin cylinder located above the top end of the prepositioning pin. The pin cylinder has a vertically arranged elongated hole through its side. A proximity switch is installed on the floating seat located outside the elongated hole. The sensing end of the proximity switch faces the elongated hole, forming a clamping feedback mechanism when prepositioning is performed via the prepositioning pin.

[0012] The floating mechanism has the following structure: it includes vertically arranged screws, with sleeves fitted on the screws, and upper and lower fixed plates fitted on the sleeves at intervals. The upper and lower fixed plates are respectively installed on the upper and lower sides of the floating seat. An upper floating plate is installed above the upper fixed plate via a steel ball assembly, and a lower floating plate is installed below the lower fixed plate via another set of steel ball assemblies. A butterfly spring washer and a washer are sequentially installed on the screw below the lower floating plate, and the bottom surface of the washer abuts against the lower support seat.

[0013] The locking mechanism is a locking cylinder installed on the top surface of the floating seat. The output end of the locking cylinder faces downward and is equipped with a locking pin. The top surface of the support seat has a locking hole for the locking pin to be fitted. The locking pin passes downward through the floating seat and is inserted into the locking hole.

[0014] The front end and left and right sides of the support seat are respectively equipped with horizontal limiting pins facing the floating seat.

[0015] The top surface of the support base is provided with a countersunk hole for the bottom end support of the corresponding floating mechanism.

[0016] The lifting mechanism comprises: a lifting motor mounted on the top of the frame with its output end facing downwards; the output end of the lifting motor is connected to the back of the lifting plate via a screw nut; symmetrically mounted on the top surface of the frame on both sides of the lifting motor are downward-facing balance cylinders, each with a hanging pin at its output end; and a hanging block matching the hanging pin is mounted on the top surface of the lifting plate; a lifting guide rail is also installed between the back of the lifting plate and the frame; an anti-fall rack is mounted on the frame outside the lifting plate, with multiple reverse teeth spaced from top to bottom on the anti-fall rack; a stop bar is mounted on the side of the lifting plate facing the anti-fall rack; the stop bar retracts away from the reverse teeth under the action of an external air source, and extends and engages between two adjacent reverse teeth after the external air source disappears.

[0017] The stand is an inverted U-shaped structure. A calibration slide is slidably installed on the base below the stand. A conveying rail is installed below the support and spans the base to the left and right. A lifting mechanism is installed on the base below the conveying rail. The test housing is conveyed on the conveying rail via tooling support.

[0018] A method of using the aforementioned transmission housing bearing bore end face distance measuring device includes the following steps:

[0019] The lifting mechanism drives the lifting plate downwards, and the measuring mechanism and support base also move downwards.

[0020] The bottom end of the prepositioning pin approaches and inserts into the positioning hole on the top surface of the housing being measured below;

[0021] The unlocking and locking mechanism restricts the floating seat's movement relative to the support seat, allowing the lifting mechanism to continue descending.

[0022] The pre-positioning pin is fully inserted into the positioning hole on the top surface of the housing being measured to complete the pre-positioning;

[0023] The clamping mechanism hooks and clamps the housing to be tested from bottom to top. At the same time, the outer wall of the conforming sleeve is fitted and adapted to the inner wall of the housing to be tested. The measuring head is triggered to measure the end face of the bearing hole to be tested on the housing to be tested, thus completing the automatic and rapid measurement of the distance between the end face of the bearing hole to be tested and the bottom surface of the housing to be tested.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention features a compact and reasonable structure, and is easy to operate. The lifting plate moves downward to approach the housing to be tested below. First, the bottom end of the pre-positioning pin contacts the positioning hole on the housing to be tested for pre-positioning. Then, the floating seat is unlocked, allowing it to float passively in the horizontal plane. The clamping mechanism hooks and clamps it from bottom to top. Precise positioning is achieved through the fitting of the conforming sleeve with the housing to be tested. Based on the reference plane of the bottom surface of the housing to be tested, the upper measuring head measures the end face of the bearing hole. This completes the automatic and rapid measurement of the distance between the end face of the bearing hole to be tested and the bottom surface of the housing to be tested. It is accurate, reliable, and stable, greatly assisting in the selection of pads.

[0026] The present invention also includes the following advantages:

[0027] In this invention, after pre-positioning, the clamping action of the clamping mechanism ensures precise positioning and triggers and guarantees the measurement of the distance between the end face of the bearing hole of the tested housing and the bottom face.

[0028] The clamping feedback mechanism enables timely, rapid, and reliable information on the clamping and positioning of the tested housing, helping to ensure the reliability of the measurement.

[0029] The installation of balance cylinders on both sides of the lifting mechanism not only ensures reliable support for the lifting plate and measuring mechanism, but also helps to reduce the requirements for the selection of the lifting motor and the matching reducer.

[0030] In this invention, the matching conveyor track and lifting mechanism enable online wiring of the distance measurement device for the bearing hole end face of the gearbox housing, achieving online measurement, effectively ensuring production cycle time and high efficiency; and the data can be directly transmitted to subsequent processes for calculating pad selection. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a schematic diagram of the assembly of the measuring mechanism on the support base of the present invention.

[0033] Figure 3 This is a schematic diagram of the measuring mechanism of the present invention mounted on the support from another perspective.

[0034] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0035] Figure 5 This is a cross-sectional view of the clamping feedback mechanism of the present invention.

[0036] Figure 6 This is a cross-sectional view of the floating mechanism of the present invention.

[0037] Figure 7This is a schematic diagram of the lifting mechanism of the present invention.

[0038] Figure 8 for Figure 7 A magnified view of a section at point B.

[0039] The components include: 1. Base; 2. Calibration slide; 3. Stand; 4. Lifting plate; 5. Lifting mechanism; 6. Measuring mechanism; 7. Support seat; 8. Conveyor track; 9. Lifting mechanism; 10. Housing to be measured;

[0040] 51. Lifting guide rail; 52. Hanging pin; 53. Balance cylinder; 54. Lifting motor; 55. Hanging block; 56. Anti-fall rack;

[0041] 61. Floating seat; 62. Floating mechanism; 63. Clamping mechanism; 64. Locking mechanism; 65. Clamping feedback mechanism; 66. Contouring sleeve; 67. Measuring head; 68. Pre-positioning pin;

[0042] 621. Upper floating plate; 622. Steel ball assembly; 623. Upper fixed plate; 624. Sleeve; 625. Screw; 626. Lower fixed plate; 627. Lower floating plate; 628. Butterfly spring washer; 629. Washer;

[0043] 631. Pull rod; 632. Swing rod; 633. Clamping arm;

[0044] 651. Pin; 652. Elastic element; 653. Limiting element; 654. Proximity switch;

[0045] 71. Countersunk hole; 73. Horizontal limit pin. Detailed Implementation

[0046] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0047] like Figure 1 , Figure 2 and Figure 3 As shown, the transmission housing bearing hole end face distance measuring device of this embodiment includes a base 1, a stand 3 is mounted on the base 1, a lifting plate 4 is slidably mounted on the front side of the stand 3, the lifting plate 4 is driven by the lifting mechanism 5 to move up and down relative to the stand 3, a support seat 7 with an L-shaped structure facing forward is mounted on the front side of the lifting plate 4, and a measuring mechanism 6 is mounted on the support seat 7.

[0048] The measuring mechanism 6 has the following structure: it includes a floating seat 61, with floating mechanisms 62 installed at each of the four corners of the floating seat 61. The floating seat 61 is supported on the top surface of the support seat 7 by the floating mechanisms 62, and the floating mechanisms 62 release the floating degree of freedom of the floating seat 61 relative to the support seat 7 in the horizontal plane. A locking mechanism 64 is installed on the floating seat 61 to restrict and lock the floating seat 61 relative to the support seat 7. The support seat 7 is vertically connected in the middle, and a contoured sleeve 66 extends downward through the support seat 7 from the bottom surface of the floating seat 61. A prepositioning pin 68 is installed on the bottom surface of the contoured sleeve 66. A measuring head 67 is installed on the bottom surface of the floating seat 61 located inside the contoured sleeve 66, and a clamping mechanism 63 is installed on the floating seat 61 located circumferentially outside the contoured sleeve 66.

[0049] The lifting plate 4 moves downward to approach the housing 10 to be tested below. First, the bottom end of the pre-positioning pin 68 contacts the positioning hole on the housing 10 to perform pre-positioning. Then, the floating seat 61 is unlocked so that it can float passively in the horizontal plane. The clamping mechanism 63 hooks and clamps it from bottom to top. The conformal sleeve 66 is fitted with the housing 10 to achieve precise positioning. Finally, based on the bottom reference surface of the housing 10, the upper measuring head 67 measures the end face of the bearing hole, completing the automatic and rapid measurement of the distance between the end face of the bearing hole to be measured and the bottom surface of the housing 10.

[0050] In this embodiment, after pre-positioning, the clamping action of the clamping mechanism 63 ensures precise positioning and triggers and guarantees the measurement of the distance between the bearing hole end face and the bottom face of the tested housing 10.

[0051] The clamping mechanism 63 is provided in three sets at intervals around the periphery of the contour sleeve 66, such as... Figure 4 As shown, the structure of the single clamping mechanism 63 is as follows: it includes a clamping cylinder with its output end facing downward and mounted on the top surface of the floating seat 61. A pull rod 631 is mounted on the output end of the clamping cylinder. The bottom end of the pull rod 631 extends downward and extends out of the floating seat 61, and a clamping arm 633 is rotatably mounted thereon. A swing rod 632 is rotatably mounted in the middle of the clamping arm 633. The end of the swing rod 632 is rotatably mounted on the bottom surface of the floating seat 61. The swing rod 632 is located between the contour sleeve 66 and the pull rod 631.

[0052] During clamping, the output end of the clamping cylinder extends downward, the pull rod 631 moves downward, pushing the clamping arm 633 to flip inward and upward until the end of the clamping arm 633 is supported on the bottom surface of the housing 10 to be measured and lifted upward; after the measurement is completed, the output end of the clamping cylinder moves upward and retracts, the pull rod 631 moves upward, pulling the clamping arm 633 to flip downward and outward, so that the end of the clamping arm 633 is disengaged from the bottom surface of the housing 10 to be measured, and the clamping of the housing 10 to be measured is unlocked.

[0053] like Figure 5As shown, the bottom of the prepositioning pin 68 is a downward-facing conical structure, and the top of the prepositioning pin 68 passes through the contour sleeve 66 and the floating seat 61 in sequence. A pin cylinder 651 with a central vertical through-hole is installed on the top surface of the floating seat 61. The upper part of the prepositioning pin 68 is movably fitted in the pin cylinder 651. An elastic element 652 and a limiting element 653 are installed in sequence in the pin cylinder 651 located above the top of the prepositioning pin 68. The pin cylinder 651 has a vertically arranged elongated hole through-hole on its side. A proximity switch 654 is installed on the floating seat 61 outside the elongated hole. The sensing end of the proximity switch 654 faces the elongated hole, forming a clamping feedback mechanism 65 when prepositioning is performed via the prepositioning pin 68.

[0054] Of course, the bottom of the pre-positioning pin 68 can also be set as an outwardly convex spherical structure, which is convenient for matching with the positioning hole for pre-positioning.

[0055] When the prepositioning pin 68 encounters resistance at the bottom of its downward movement, the elastic element 652 will be compressed, causing the prepositioning pin 68 to have a certain floating threshold in the vertical direction, effectively ensuring its reliability and service life; and it can also combine the position feedback of the prepositioning pin 68 in height from the proximity switch 654 to promptly know the actual insertion status between the prepositioning pin 68 and the positioning hole of the housing 10 under test, so as to ensure the smooth progress of the measurement.

[0056] The clamping feedback mechanism 65 enables timely, rapid, and reliable information on the clamping and positioning of the tested housing 10, helping to ensure the accuracy of the measurement.

[0057] like Figure 6 As shown, the floating mechanism 62 has the following structure: it includes vertically arranged screws 625, sleeves 624 are fitted on the screws 625, and upper fixing plates 623 and lower fixing plates 626 are fitted on the sleeves 624 at intervals. The upper fixing plates 623 and lower fixing plates 626 are respectively installed on the upper and lower sides of the floating seat 61. An upper floating plate 621 is installed above the upper fixing plate 623 via a steel ball assembly 622, and a lower floating plate 627 is installed below the lower fixing plate 626 via another set of steel ball assemblies 622. A butterfly spring washer 628 and a washer 629 are sequentially installed on the screws 625 below the lower floating plate 627, and the bottom surface of the washer 629 abuts against the lower support seat 7.

[0058] The steel ball assembly 622 includes annular members that are fixedly fitted to the upper and lower objects respectively. Multiple steel balls are installed together along the circumference between the two annular members, and the multiple steel balls are supported and installed on the cage. The top surface of the lower annular member has a concave groove that matches the bottom end of the steel ball. For example, in the steel ball assembly 622 installed between the upper floating plate 621 and the upper fixed plate 623, the upper annular member is fitted to the bottom surface of the upper floating plate 621, and the lower annular member is fitted to the top surface of the upper fixed plate 623. The top surface of the annular member on the top surface of the upper fixed plate 623 has a concave groove for the steel ball to be fitted. After the floating restriction is released, under the action of external force, the upper and lower annular members move passively relative to each other in the horizontal direction, thereby forming a horizontal floating.

[0059] The locking mechanism 64 is a locking cylinder installed on the top surface of the floating seat 61. The output end of the locking cylinder faces downward and is equipped with a locking pin. The top surface of the support seat 7 is provided with a locking hole for the locking pin to be fitted. The locking pin passes downward through the floating seat 61 and is inserted into the locking hole, so that the locking mechanism 64 forms a relatively fixed restriction on the floating seat 61 and the support seat 7 in the horizontal direction.

[0060] The front end and left and right sides of the support 7 are respectively equipped with horizontal limiting pins 73 facing the floating seat 61, which limit the floating range of the floating seat 61 in the horizontal direction.

[0061] The top surface of the support base 7 is provided with a countersunk hole 71 for the bottom end of the corresponding floating mechanism 62 to be supported and accommodated. The countersunk hole 71 ensures that the support base 7 provides reliable and stable support for the floating mechanism 62.

[0062] like Figure 7 As shown, the structure of the lifting mechanism 5 is as follows: it includes a lifting motor 54 installed on the top of the upright 3 with its output end facing downwards. The output end of the lifting motor 54 is connected to the back of the lifting plate 4 via a screw nut. On the top surface of the upright 3 located on both sides of the lifting motor 54, symmetrically mounted are downward-facing balance cylinders 53. Each balance cylinder 53 has a mounting pin 52 installed at its output end. The top surface of the lifting plate 4 is equipped with mounting blocks 55 that match the mounting pins 52. Figure 8 As shown, the balance cylinder 53 forms a hanging support and balance for the lifting plate 4 on both sides of the lifting motor 54; a lifting guide rail 51 is also installed between the back of the lifting plate 4 and the upright 3 to help ensure the reliability and stability of the lifting plate 4 moving up and down relative to the upright 3; an anti-fall rack 56 is installed on the upright 3 located outside the lifting plate 4, and multiple reverse teeth are installed on the anti-fall rack 56 from top to bottom. A stop bar is installed on the side of the lifting plate 4 facing the anti-fall rack 56. The stop bar retracts away from the reverse teeth under the action of the external air source. After the external air source disappears, the stop bar extends and is locked between two adjacent reverse teeth, thereby effectively preventing the lifting plate 4 from falling accidentally in the event of a sudden power outage or air outage.

[0063] The installation of the balance cylinders 53 on both sides of the lifting mechanism 5, while ensuring reliable support for the lifting plate 4 and the measuring mechanism 6, effectively helps to reduce the selection requirements for the lifting motor 54 and the matching reducer.

[0064] The stand 3 is an inverted U-shaped structure. A calibration slide 2 is slidably installed on the base 1 below the stand 3. A conveying track 8 is installed below the support seat 7 and spans the base 1 from left to right. A lifting mechanism 9 is installed on the base 1 below the conveying track 8. The test housing 10 is conveyed on the conveying track 8 via tooling support. When the lifting mechanism 9 works, it lifts the test housing 10 upward and removes it from the conveying track 8.

[0065] In this embodiment, the matching conveyor track 8 and lifting mechanism 9 enable online wiring of the distance measuring device for the bearing hole end face of the gearbox housing, achieving online measurement, effectively ensuring production cycle time, and high efficiency; and the data can be directly transmitted to subsequent processes for calculating pad selection.

[0066] The method of using the transmission housing bearing hole end face distance measuring device in this embodiment includes the following steps:

[0067] The lifting mechanism 5 drives the lifting plate 4 to move downwards, and the measuring mechanism 6 and the support seat 7 also move downwards.

[0068] The bottom end of the prepositioning pin 68 approaches and inserts into the positioning hole on the top surface of the housing 10 being measured below;

[0069] The unlocking and locking mechanism 64 restricts the floating of the floating seat 61 relative to the support seat 7, and the lifting mechanism 5 continues to descend;

[0070] The pre-positioning pin 68 is fully inserted into the positioning hole on the top surface of the housing 10 being tested, thus completing the pre-positioning;

[0071] The clamping mechanism 63 hooks and clamps the housing 10 to be tested from bottom to top. At the same time, the outer wall of the contour sleeve 66 fits and adapts to the inner wall of the housing 10 to complete the precise positioning. The measuring head 67 is triggered to measure the end face of the bearing hole to be tested in the housing 10, thus completing the automatic and rapid measurement of the distance between the end face of the bearing hole to be tested and the bottom surface of the housing 10.

[0072] By combining the lifting mechanism 9 and the conveying track 8, continuous measurement of the measured shell 10 on the measuring device can be achieved, effectively matching and ensuring the operation cycle.

[0073] This invention enables automatic and rapid measurement of the distance between the end face of the bearing hole to be measured and the bottom surface of the housing under test. It is accurate, reliable, and stable, greatly assisting in the selection of pads.

[0074] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A device for measuring the distance between the end faces of a bearing bore in a transmission housing, characterized in that: Includes a base (1), on which a stand (3) is mounted, and a lifting plate (4) is slidably mounted on the front side of the stand (3). The lifting plate (4) is driven by a lifting mechanism (5) to move up and down relative to the stand (3). A support seat (7) with an L-shaped structure facing forward is mounted on the front side of the lifting plate (4). A measuring mechanism (6) is mounted on the support seat (7). The structure of the measuring mechanism (6) is as follows: it includes a floating seat (61), and a floating mechanism (62) is installed at each of the four corners of the floating seat (61). The floating seat (61) is supported on the top surface of the support seat (7) by the floating mechanism (62). The floating mechanism (62) releases the floating degree of freedom of the floating seat (61) relative to the support seat (7) in the horizontal plane. A locking mechanism (64) is installed on the floating seat (61). The locking mechanism (64) restricts and locks the floating seat (61) relative to the support seat (7). The support seat (7) is vertically connected in the middle. A contoured sleeve (66) extends downward through the support seat (7) from the bottom surface of the floating seat (61). A prepositioning pin (68) is installed downward through the bottom surface of the contoured sleeve (66). A measuring head (67) is installed on the bottom surface of the floating seat (61) located inside the contoured sleeve (66). A clamping mechanism (63) is installed on the floating seat (61) located circumferentially outside the contoured sleeve (66). The bottom of the prepositioning pin (68) is a downward-facing conical structure, and the top of the prepositioning pin (68) passes through the contour sleeve (66) and the floating seat (61) in sequence. The top surface of the floating seat (61) is equipped with a pin cylinder (651) that runs vertically through the center. The upper part of the prepositioning pin (68) is movably fitted in the pin cylinder (651). The pin cylinder (651) located above the top of the prepositioning pin (68) is equipped with an elastic element (652) and a limiting element (653) in sequence. The pin cylinder (651) is laterally opened with an elongated hole arranged vertically. A proximity switch (654) is installed on the floating seat (61) outside the elongated hole. The sensing end of the proximity switch (654) faces the elongated hole, forming a clamping feedback mechanism (65) when prepositioning is performed via the prepositioning pin (68).

2. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The clamping mechanism (63) is arranged in three sets at intervals around the periphery of the contour sleeve (66). The structure of a single clamping mechanism (63) is as follows: a clamping cylinder with its output end facing down is installed on the top surface of the floating seat (61). A pull rod (631) is installed on the output end of the clamping cylinder. The bottom end of the pull rod (631) extends downward out of the floating seat (61) and is rotatably mounted with a clamping arm (633). A swing rod (632) is rotatably mounted in the middle of the clamping arm (633). The end of the swing rod (632) is rotatably mounted on the bottom surface of the floating seat (61). The swing rod (632) is located between the contour sleeve (66) and the pull rod (631).

3. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The floating mechanism (62) has the following structure: it includes vertically arranged screws (625), sleeves (624) are fitted on the screws (625), and upper fixing plates (623) and lower fixing plates (626) are fitted on the sleeves (624) at intervals. The upper fixing plates (623) and lower fixing plates (626) are respectively installed on the upper and lower sides of the floating seat (61); an upper floating plate (621) is installed above the upper fixing plate (623) via a steel ball assembly (622), and a lower floating plate (627) is installed below the lower fixing plate (626) via another set of steel ball assemblies (622). A butterfly spring washer (628) and a washer (629) are installed in sequence on the screws (625) below the lower floating plate (627), and the bottom surface of the washer (629) abuts against the lower support seat (7).

4. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The locking mechanism (64) is a locking cylinder installed on the top surface of the floating seat (61). The output end of the locking cylinder faces downward and is equipped with a locking pin. The top surface of the support seat (7) is provided with a locking hole for the locking pin to be fitted. The locking pin passes downward through the floating seat (61) and is inserted into the locking hole.

5. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The support base (7) has horizontal limiting pins (73) installed at the front end and on the left and right sides facing the floating base (61).

6. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The top surface of the support base (7) is provided with a countersunk hole (71) for the bottom end of the corresponding floating mechanism (62) to be supported and accommodated.

7. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The lifting mechanism (5) has the following structure: it includes a lifting motor (54) installed on the top of the upright (3) with its output end facing downwards. The output end of the lifting motor (54) is connected to the back of the lifting plate (4) via a screw nut. On the top surface of the upright (3) on both sides of the lifting motor (54), there are also symmetrically installed balance cylinders (53) with their output ends facing downwards. Each balance cylinder (53) has a hanging nail (52) installed at its output end. The top surface of the lifting plate (4) is equipped with a hook that hangs on the hanging nail (52). A matching mounting block (55) is installed; a lifting guide rail (51) is also installed between the back of the lifting plate (4) and the upright (3); a fall protection rack (56) is installed on the upright (3) located outside the lifting plate (4), and multiple reverse teeth are installed on the fall protection rack (56) from top to bottom. A stop bar is installed on the side of the lifting plate (4) facing the fall protection rack (56). The stop bar retracts away from the reverse teeth under the action of the external air source. After the external air source disappears, the stop bar extends and is locked between two adjacent reverse teeth.

8. The distance measuring device for the end face of the bearing hole of the transmission housing as described in claim 1, characterized in that: The stand (3) is an inverted U-shaped structure. A calibration slide (2) is slidably installed on the base (1) below the stand (3). A conveying track (8) is installed below the support seat (7) and spans the base (1) to the left and right. A lifting mechanism (9) is installed on the base (1) below the conveying track (8). The test housing (10) is conveyed on the conveying track (8) via tooling support.

9. A method of using the distance measuring device for the end face of the bearing hole of a transmission housing as described in claim 1, characterized in that: Includes the following steps: The lifting mechanism (5) drives the lifting plate (4) to move downward, and the measuring mechanism (6) and the support seat (7) move downward; The bottom end of the prepositioning pin (68) approaches and penetrates the positioning hole opening on the top surface of the housing (10) below; The unlocking locking mechanism (64) restricts the floating of the floating seat (61) relative to the support seat (7), and the lifting mechanism (5) continues to descend; The pre-positioning pin (68) is fully inserted into the positioning hole on the top surface of the housing (10) being measured, thus completing the pre-positioning; The clamping mechanism (63) hooks up and clamps the housing (10) to be tested from bottom to top. At the same time, the outer wall of the contour sleeve (66) is fitted and adapted to the inner wall of the housing (10) to trigger the measuring head (67) to measure the end face of the bearing hole to be tested on the housing (10) to complete the automatic and rapid measurement of the distance between the end face of the bearing hole to be tested on the housing (10) and the bottom surface of the housing (10).

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