A door hinge coaxiality inspection tool and its testing method

Abstract

This invention provides a coaxiality inspection tool for a car door hinge, including a handle and a first and second inspection rod universally connected to the handle. The first inspection rod includes a first pin and a first extension rod, and the second inspection rod includes a second pin and a second extension rod. The handle is provided with parallel annular first and second inspection frames with inspection through holes. The first extension rod extends into the first inspection frame, and the second extension rod extends into the second inspection frame. When the axis of the first inspection rod is collinear with the center line of the first inspection frame, and the axis of the second inspection rod is collinear with the center line of the second inspection frame, the axes of the first and second inspection rods are collinear. The advantages of this invention are that the first and second inspection rods are universally connected and connected to the handle via a slide rail, allowing the first and second pins to be tilted, making installation convenient and quick; the coaxiality deviation is amplified by the extension rod and then quantified by a dial indicator, allowing for the measurement of the deviation amount and direction.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile assembly. Specifically, it relates to a coaxiality gauge for vehicle door hinges and a detection method thereof. Background Art

[0002] The upper and lower hinges of an automobile door are rigidly connected through a door assembly. Affected by factors such as hinge dimensions, installation fixture accuracy, and door assembly dimensions, the axes of the upper and lower hinges will show varying degrees of non - coaxiality. Therefore, the concept of door hinge coaxiality is introduced to quantify the non - coaxiality degree of the upper and lower door hinges with a unified standard. Similarly, the body - side hinges will also show varying degrees of non - coaxiality due to factors such as installation fixtures, parts, and processes. When the cumulative deviation of the two reaches a certain level, the door assembly will not be able to be hung onto the body, which is also the most common and important problem brought by coaxiality deviation. Therefore, for a vehicle manufacturing plant, analyzing, controlling, and solving the coaxiality problem of door hinges is a very important task. To solve the coaxiality problem, it is necessary to detect the coaxiality deviation of the door - side and body - side hinges.

[0003] Currently, in order to detect the coaxiality of door hinges, a through - type coaxiality gauge is generally used for detection. If the gauge can be completely inserted, it is considered qualified; if it cannot be completely inserted, it is unqualified. However, the through - type coaxiality gauge can only judge whether it is qualified, and cannot quantify the deviation degree and deviation direction, making it difficult to guide the formulation of measures and unable to provide a basis for the adjustment of installation fixtures. Summary of the Invention

[0004] To solve the above - mentioned technical problems, the present invention provides a coaxiality gauge for vehicle door hinges and a detection method thereof, which magnify the coaxiality display deviation through an extension rod, and measure the coaxiality deviation value and direction through a dial indicator, providing a basis for the adjustment of installation fixtures.

[0005] The present invention adopts the following technical solutions to solve the technical problems:

[0006] A coaxiality gauge for vehicle door hinges includes a handle, a first detection rod, and a second detection rod. Among them, the first detection rod and the second detection rod are respectively connected to both ends of the handle through a first universal joint and a second universal joint. The first detection rod includes a first pin and a first extension rod located on both sides of the first universal joint, and the first pin is adapted to the upper hinge. The second detection rod includes a second pin and a second extension rod located on both sides of the second universal joint, and the second pin is adapted to the lower hinge.

[0007] The handle is provided with a first detection frame and a second detection frame that are parallel to each other. Both the first detection frame and the second detection frame are annular. The first extension rod extends into the first detection frame, and the second extension rod extends into the second detection frame. When the axis of the first detection rod is collinear with the center line of the first detection frame and the axis of the second detection rod is collinear with the center line of the second detection frame, the axes of the first detection rod and the second detection rod are collinear.

[0008] Both the first and second detection frames are provided with detection through holes for inserting dial indicators.

[0009] Furthermore, the cross-sections of the free ends of the first and second extension rods are both circular or square, and the cross-sections of the first and second detection frames are both annular or square rings, with the two adjacent sides of the square extending along the X and Y directions respectively. Preferably, the first and second detection frames are the same, and the first and second detection rods are the same. More preferably, the cross-sections of the free ends of the first and second extension rods are both square, and the cross-sections of the first and second detection frames are both square rings, with the two adjacent sides of the square extending along the X and Y directions respectively, facilitating the measurement of X-direction and Y-direction deviations.

[0010] Furthermore, the detection via includes an X-direction detection hole and a Y-direction detection hole, the X-direction detection hole extending along the X direction and the Y-direction detection hole extending along the Y direction, which can detect X-direction deviation and Y-direction deviation.

[0011] Furthermore, the first pin and the second pin are respectively close to the first end and the second end of the handle, and the first extension rod and the second extension rod extend toward the middle of the handle; the first universal joint and / or the second universal joint are connected to the handle via a slide rail, so that the first pin and the second pin can be respectively assembled to the upper hinge and the lower hinge.

[0012] Furthermore, the length of the first extension rod is 8-12 times the length of the first pin; the length of the second extension rod is 8-12 times the length of the second pin, effectively amplifying the deviation between the first pin axis and the second pin axis, facilitating dial indicator measurement and reading.

[0013] Furthermore, the first pin and the second pin are configured as pin shafts, with the maximum diameters of the first pin and the second pin being the minimum values ​​of the hinge hole diameters of the upper and lower hinges, respectively. The accuracy of the first pin and the second pin is 1 / 10 to 1 / 3 of the hinge hole tolerances of the upper and lower hinges, respectively. The first pin and the second pin are configured as sleeves, with the minimum hole diameters of the sleeve holes of the first pin and the second pin being the maximum values ​​of the hinge shaft diameters of the upper and lower hinges, respectively. The accuracy of the sleeve holes of the first pin and the second pin is 1 / 10 to 1 / 3 of the hinge hole tolerances of the upper and lower hinges, respectively. This allows the first pin and the second pin to coincide with the axis of the corresponding hinge hole or hinge shaft, improving measurement accuracy.

[0014] Furthermore, the inspection tool also includes a dial indicator for detecting the distance between the free end of the first extension rod and the inner wall of the first inspection frame, and the distance between the free end of the second extension rod and the inner wall of the second inspection frame.

[0015] Furthermore, the fixture also includes a calibration block with a calibration hole. When the dial indicator is inserted into the calibration hole, the fixing rod of the dial indicator abuts against the outer wall of the calibration block, and the measuring rod abuts against the bottom wall of the calibration hole. When the axis of the first detection rod is collinear with the center line of the first detection frame and the axis of the second detection rod is collinear with the center line of the second detection frame, the distance from the outer wall of the first detection frame to the first extension rod and the distance from the outer wall of the second detection frame to the second extension rod are the same as the depth of the calibration hole, thereby improving the accuracy of the measurement.

[0016] Furthermore, the diameter of the calibration hole and the diameter of the detection through hole of the calibration block are both 1.02-1.05 times the diameter of the measuring rod of the dial indicator, and the depth of the detection through hole is 40%-60% of the length of the measuring rod of the dial indicator, thereby improving the calibration accuracy and measurement accuracy of the dial indicator.

[0017] Furthermore, a method for detecting the coaxiality of a car door hinge, using the aforementioned inspection tool, includes the following steps:

[0018] Step 1: Assemble the first pin onto the upper hinge and the second pin onto the lower hinge.

[0019] Step 2: After calibrating the dial indicator using a standard block, insert the dial indicator into the X-direction detection hole and Y-direction detection hole of the first detection frame and the second detection frame respectively, and measure the deviation of the first extension rod and the second extension rod, including the X-direction deviation L1x of the first extension rod, the Y-direction deviation L1y of the first extension rod, the X-direction deviation L2x of the second extension rod, and the Y-direction deviation L2y of the second extension rod.

[0020] Step 3: Check whether the deviation between the first extension rod and the second extension rod is within the acceptable range. If the deviation is within the acceptable range, it indicates that the coaxiality of the upper hinge and the lower hinge meets the requirements. If the deviation exceeds the acceptable range, calculate the deviation between the first pin and the second pin based on the deviation between the first extension rod and the second extension rod, the ratio of the length of the first extension rod to the length of the first pin, and the ratio of the length of the second extension rod to the length of the second pin. This includes the X-direction deviation L1x′ of the first pin, the Y-direction deviation L1y′ of the first pin, the X-direction deviation L2x′ of the second pin, and the Y-direction deviation L2y′ of the second pin.

[0021] Step 4: Adjust the mounting fixture of the corresponding hinge according to the deviation between the first pin and the second pin;

[0022] Step 5: Install the upper and lower hinges using the adjusted mounting fixture;

[0023] Step 6: Return to Step 1 until the deviation between the first extension rod and the second extension rod is within the acceptable range.

[0024] Furthermore, the method for adjusting the hinge mounting fixture includes: comparing the X-direction and Y-direction deviations of the first pin and the second pin respectively; when the X-direction and / or Y-direction deviations are different, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction deviations are the same, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the deviation value in each direction.

[0025] Furthermore, the acceptable range for the deviation between the first extension rod and the second extension rod is 0-1.5mm.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) By universally connecting the first detection rod and the second detection rod, the first pin and the second pin can be tilted, and the first universal joint and / or the second universal joint are connected to the handle through the slide rail, so that the first pin and the second pin can be smoothly assembled to the upper hinge and the lower hinge respectively, and coincide with the axis of the corresponding hinge. The installation is convenient and quick, and it can detect the situation where the upper hinge and the lower hinge have multiple deviation states.

[0028] (2) The deviation of the coaxiality of the upper and lower hinges is amplified by the first extension rod and the second extension rod, and then quantified by the dial indicator to improve the identification ability of the inspection tool, thereby measuring the deviation and direction of the upper and lower hinges, providing a basis and guidance for the adjustment of the hinge installation fixture. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the door hinge coaxiality inspection fixture of the present invention.

[0030] Figure 2 This is a schematic diagram of the door hinge coaxiality gauge of the present invention when detecting the deviation of the axes of the upper and lower hinges having an included angle α.

[0031] Figure 3 This is a schematic diagram of the door hinge coaxiality inspection tool of the present invention when detecting the deviation state where the axes of the upper and lower hinges are parallel but not aligned.

[0032] Figure 4 This is a schematic diagram of the AA section of the door hinge coaxiality inspection tool of the present invention.

[0033] Figure 5 This is a schematic diagram of the calibration block calibration structure of the door hinge coaxiality gauge of the present invention.

[0034] In the diagram: 1-Handle; 11-Slide rail; 2a-First detection rod; 21a-First pin; 22a-First extension rod; 2b-Second detection rod; 21b-Second pin; 22b-Second extension rod; 3a-First universal joint; 3b-Second universal joint; 4a-First detection frame; 4b-Second detection frame; 5-Detection through hole; 6-Dial indicator; 61-Fixing rod; 62-Measuring rod; 7-Calibration block; 71-Calibration hole; 100-Upper hinge; 200-Lower hinge. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, it should be noted that the directions "X," "Y," and "Z" refer to the directions indicated by the coordinate system in the accompanying drawings, and are only for the convenience of describing the invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The term "and / or," when used to list two or more items, means that any one of the listed items, or any combination of two or more of the listed items, can be used.

[0037] This invention provides a door hinge coaxiality inspection tool, such as... Figure 1As shown, the device includes a handle 1, a first detection rod 2a, and a second detection rod 2b. The first detection rod 2a and the second detection rod 2b are connected to both ends of the handle 1 via a first universal joint 3a and a second universal joint 3b, respectively. The first detection rod 2a includes a first pin 21a and a first extension rod 22a located on both sides of the first universal joint 3a, and the first pin 21a is adapted to the upper hinge 100. The second detection rod 2b includes a second pin 21b and a second extension rod 22b located on both sides of the second universal joint 3b, and the second pin 21b is adapted to the lower hinge 200. The handle 1 is provided with a first detection frame 4a and a second detection frame 4b that are parallel to each other. Both the first detection frame 4a and the second detection frame 4b are annular. The first extension rod 22a extends into the first detection frame 4a, and the second extension rod 22b extends into the second detection frame 4b. When the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the center line of the second detection frame 4b, the axes of the first detection rod 2a and the second detection rod 2b are collinear. Both the first detection frame 4a and the second detection frame 4b are provided with detection through holes 5 for inserting a dial indicator 6. Preferably, the detection through holes 5 include an X-direction detection hole and a Y-direction detection hole. The X-direction detection hole extends along the X direction, and the Y-direction detection hole extends along the Y direction, which can detect X-direction deviation and Y-direction deviation.

[0038] In a typical car door hinge, the upper hinge 100 and lower hinge 200 on the body side are configured as hinge holes. Correspondingly, the first pin 21a and the second pin 21b are configured as pins, adapted to the hinge holes of the upper hinge 100 and lower hinge 200, and can be inserted into the upper hinge 100 and lower hinge 200 respectively. The upper hinge 100 and lower hinge 200 on the door side are configured as hinge shafts. Correspondingly, the first pin 21a and the second pin 21b are configured as sleeves, adapted to the hinge shafts of the upper hinge 100 and lower hinge 200, and can be inserted into the sleeves respectively. This gauge can measure the deviation state where the axes of the upper hinge 100 and lower hinge 200 have an included angle α, and can also measure the deviation state where the axes of the upper hinge 100 and lower hinge 200 are parallel but not aligned, i.e., a state with translational deviation. Taking a body-side hinge as an example... Figure 2 As shown, when the upper hinge 100 and the lower hinge 200 have an included angle α, the first and second universal joints 3a and 3b are tilted in different directions respectively, so that the first pin 21a can be inserted into the upper hinge 100 and the second pin 21b can be inserted into the lower hinge 200. At this time, the axis of the first pin 21a and the axis of the second pin 21b have an included angle α, and the deviation between the axis of the first pin 21a and the axis of the second pin 21b is the deviation between the axes of the upper hinge 100 and the lower hinge 200. Figure 3As shown, when the axes of the upper hinge 100 and the lower hinge 200 have a translational deviation, the first detection rod 2a and the second detection rod 2b are tilted in the same direction by the first universal joint 3a and the second universal joint 3b, so that the first detection rod 2a and the second detection rod 2b are approximately parallel. Thus, the first pin 21a can be inserted into the upper hinge 100 and the second pin 21b can be inserted into the lower hinge 200. At this time, the axis of the first pin 21a and the axis of the second pin 21b are parallel, and the deviation ΔL between the axis of the first pin 21a and the axis of the second pin 21b is the deviation between the axes of the upper hinge 100 and the lower hinge 200. The gauge connects the first detection rod 2a and the second detection rod 2b to the handle 1 via a spherical bearing or a universal joint, allowing the first pin 21a and the second pin 21b to retain a small number of degrees of freedom around the X and Y axes. When the upper hinge 100 and the lower hinge 200 are not on the same axis, the first pin 21a and the second pin 21b can be tilted, allowing them to be smoothly inserted into the upper hinge 100 and the lower hinge 200 respectively, and to coincide with the axis of the corresponding hinge. The installation is convenient and quick, and it can detect various deviation states of the upper hinge 100 and the lower hinge 200.

[0039] Since the coaxiality deviation between the upper hinge 100 and the lower hinge 200 is relatively small (generally less than 0.2 mm), it is difficult to measure and indicate. Therefore, a first extension rod 22a and a second extension rod 22b are respectively set on the back of the first pin 21a and the second pin 21b. This can amplify the coaxiality deviation display. Then, by using a dial indicator 6 in conjunction with the first detection frame 4a and the second detection frame 4b, the displacement deviation of the free end of the extension rod can be measured. This allows us to determine the tilt direction and tilt amount of the axes of the upper hinge 100 and the lower hinge 200, providing a basis and guidance for adjusting the hinge mounting fixture.

[0040] In some embodiments, the free ends of the first extension rod 22a and the second extension rod 22b have circular or square cross-sections, and the cross-sections of the first detection frame 4a and the second detection frame 4b are both annular or square rings, with adjacent sides of the square extending along the X and Y directions, respectively. The centerline of the first detection frame 4a is collinear with the centerline of the second detection frame 4b. When the axis of the first detection rod 2a is collinear with the axis of the second detection rod 2b, the first extension rod 22a is located at the center of the first detection frame 4a, and the X-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a is the same as the Y-direction distance. When the second extension rod 22b is located at the center of the second detection frame 4b, the X-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b is the same as the Y-direction distance. The hinge holes of the upper hinge 100 and the lower hinge 200 have the same size. Preferably, the first detection frame 4a and the second detection frame 4b are the same, and the first detection rod 2a and the second detection rod 2b are the same. The center lines of the first detection frame 4a and the second detection frame 4b are collinear. When the first extension rod 22a is located at the center of the first detection frame 4a and the second extension rod 22b is located at the center of the second detection frame 4b, the X-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a, the Y-direction distance between the first extension rod 22a and the inner wall of the first detection frame 4a, the X-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b, and the Y-direction distance between the second extension rod 22b and the inner wall of the second detection frame 4b are all the same, which makes it convenient to use a dial indicator 6 to measure the X-direction deviation and the Y-direction deviation.

[0041] More preferably, the cross-sections of the free ends of the first extension rod 22a and the second extension rod 22b are both square, and the cross-sections of the first detection frame 4a and the second detection frame 4b are both square rings, with the two adjacent sides of the square extending along the X and Y directions respectively. The deviation direction is easier to observe based on the tilt direction of the extension rod.

[0042] To reduce the length and weight of the inspection tool and facilitate handling, the first pin 21a and the second pin 21b are respectively positioned near the first and second ends of the handle 1, and the first extension rod 22a and the second extension rod 22b extend towards the middle of the handle 1. When using the inspection tool, the first pin 21a needs to be moved upward to assemble with the upper hinge 100, and the second pin 21b needs to be moved downward to assemble with the lower hinge 200. After installation, the distance between the free ends of the first pin 21a and the second pin 21b is greater than the distance between the upper hinge 100 and the lower hinge 200 (the distance between the upper hinge 100 and the lower hinge 200 is the distance between the lower end face of the upper hinge 100 and the upper end face of the lower hinge 200). To facilitate the assembly of the first pin 21a and the second pin 21b with the upper hinge 100 and the lower hinge 200 respectively, the first universal joint 3a and / or the second universal joint 3b are connected to the handle 1 via a slide rail 11, enabling movement along the Z direction. Assuming the first universal joint 3a is directly fixed to the handle 1, and the second universal joint 3b is connected to the handle 1 via the slide rail 11, taking the vehicle side hinge as an example, in use, first insert the first pin 21a into the upper hinge 100, then adjust the position of the second pin 21b via the slide rail 11 so that the second pin 21b is located in the space between the upper and lower hinges 200, then pull the handle 1 or pull the second detection rod 2b to move the second pin 21b downward and insert it into the lower hinge 200. The distance between the free end of the first pin 21a and the free end of the second pin 21b is controlled by the slide rail 11, making the operation convenient and quick.

[0043] In some embodiments, the length of the first extension rod 22a is 8-12 times the length of the first pin 21a; the length of the second extension rod 22b is 8-12 times the length of the second pin 21b. This can effectively amplify the deviation between the axes of the first pin 21a and the second pin 21b, facilitating the measurement reading of the dial indicator 6, and ensuring a gap between the free ends of the first extension rod 22a and the second extension rod 22b, thus avoiding interference between the second detection rod 2b and the first detection rod 2a when the second detection rod 2b moves along the slide rail 11.

[0044] When the upper hinge 100 and lower hinge 200 on the body side of the car door hinge are set as hinge holes, and the drawing requires the hinge hole size to have a maximum and minimum value, the first pin 21a and the second pin 21b are set as pins accordingly. The size of the first pin 21a and the second pin 21b cannot be greater than the hinge hole size. If they are greater than the hinge hole size, the pins cannot be inserted into the hinge hole. At the same time, they cannot be too small. If they are too small, it cannot be guaranteed that the first pin 21a and the second pin 21b coincide with the axis of the corresponding hinge hole. Moreover, the probability that the hinge hole diameter of the upper hinge 100 and the lower hinge 200 is the minimum value is extremely low. Therefore, the maximum diameter of the first pin 21a and the second pin 21b are respectively the minimum value of the hinge hole diameter of the upper hinge 100 and the lower hinge 200. The accuracy of the first pin 21a and the second pin 21b is respectively 1 / 10 to 1 / 3 of the hinge hole tolerance of the upper hinge 100 and the lower hinge 200. For example, the drawing requires the hinge hole size of the upper hinge 100 and the lower hinge 200 to be 10.04-10.13mm, with a tolerance of 0.09mm. The maximum diameter of the first pin 21a and the second pin 21b is the minimum value of the hinge hole diameter, which is 10.04mm. If the accuracy is 1 / 10 of the hinge hole tolerance, the diameter of the first pin 21a and the second pin 21b is 10.031-10.04mm.

[0045] When the upper hinge 100 and lower hinge 200 on the door side of the car door hinge are set as hinge shafts, and the drawing requires the hinge shaft dimensions to have a maximum and minimum value, the first pin 21a and the second pin 21b are correspondingly set as sleeves. The size of the sleeve of the first pin 21a and the second pin 21b cannot be smaller than the hinge shaft size. If it is smaller than the hinge shaft size, the hinge shaft cannot be inserted into the sleeve hole. At the same time, it cannot be too large. If it is too large, it cannot be guaranteed that the first pin 21a and the second pin 21b coincide with the axis of the corresponding hinge shaft. Moreover, the probability that the hinge shaft diameter of the upper hinge 100 and the lower hinge 200 is the maximum value is extremely low. Therefore, the minimum hole diameter of the sleeve hole of the first pin 21a and the second pin 21b is the maximum value of the hinge shaft diameter of the upper hinge 100 and the lower hinge 200, respectively. The accuracy of the sleeve hole of the first pin 21a and the second pin 21b is 1 / 10 to 1 / 3 of the hinge hole tolerance of the upper hinge 100 and the lower hinge 200, respectively. For example, the drawing requires the hinge shaft dimensions of the upper hinge 100 and the lower hinge 200 to be 10.04-10.13mm, with a tolerance of 0.09mm. The minimum diameter of the sleeve hole of the first pin 21a and the second pin 21b is the maximum diameter of the hinge shaft, which is 10.13mm. If the accuracy is 1 / 10 of the hinge shaft tolerance, the diameter of the sleeve hole of the first pin 21a and the second pin 21b is 10.13-10.139mm.

[0046] The gauge also includes a dial indicator 6, used to measure the distance between the free end of the first extension rod 22a and the inner wall of the first detection frame 4a, and the distance between the free end of the second extension rod 22b and the inner wall of the second detection frame 4b. The dimensions of the first detection frame 4a and the first extension rod 22a are such that the dial indicator 6 can be inserted into the detection through-hole 5 of the first detection frame 4a, and when the fixing rod 61 abuts against the outer wall of the first detection frame 4a, the measuring rod 62 can abut against the first extension rod 22a. The dimensions of the second detection frame 4b and the second extension rod 22b are such that the dial indicator 6 can be inserted into the detection through-hole 5 of the second detection frame 4b, and when the fixing rod 61 abuts against the outer wall of the second detection frame 4b, the measuring rod 62 can abut against the second extension rod 22b. The dial indicator 6 can effectively and accurately measure the distance between the free end of the first extension rod 22a and the inner wall of the first detection frame 4a, and the distance between the free end of the second extension rod 22b and the inner wall of the second detection frame 4b.

[0047] The fixture also includes a calibration block 7, which has a calibration hole 71. When the dial indicator 6 is inserted into the calibration hole 71, the fixing rod 61 of the dial indicator 6 abuts against the outer wall of the calibration block 7, and the measuring rod 62 abuts against the bottom wall of the calibration hole 71. When the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a and the axis of the second detection rod 2b is collinear with the center line of the second detection frame 4b, the distance from the outer wall of the first detection frame 4a to the first extension rod 22a and the distance from the outer wall of the second detection frame 4b to the second extension rod 22b are the same as the depth of the calibration hole 71.

[0048] refer to Figure 4 and Figure 5As shown, after inserting dial indicator 6 into calibration hole 71, dial indicator 6 is zeroed to complete the calibration of dial indicator 6. At this time, the length of measuring rod 62 of dial indicator 6 is the depth L0 of calibration hole 71. Dial indicator 6 is inserted into detection through hole 5. The length of measuring rod 62 of dial indicator 6 is the distance L1 from the outer wall of the first detection frame 4a to the first extension rod 22a, and also the distance L1 from the outer wall of the second detection frame 4b to the second extension rod 22b. When the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the axis of the second detection frame 4b, that is, when the axis of the first detection rod 2a and the axis of the second detection rod 2b are collinear (coaxial), the reading of dial indicator 6 is zero; conversely, when the reading of dial indicator 6 is zero, it indicates that the axis of the first detection rod 2a is collinear with the center line of the first detection frame 4a, and the axis of the second detection rod 2b is collinear with the axis of the second detection frame 4b. The dial indicator 6 measures the deviations of the axis of the first detection rod 2a relative to the center line of the first detection frame 4a and the axis of the second detection rod 2b relative to the center line of the second detection frame 4b. After adjusting the hinge mounting fixture according to the measurements of dial indicator 6, the axes of the first detection rod 2a and the first detection frame 4a are made collinear, and the axes of the second detection rod 2b and the second detection frame 4b are made collinear. This ensures that the axes of the first and second detection rods are collinear, thus making the axes of the upper hinge 100 and the lower hinge 200 coaxial. Since the axis deviations of the upper hinge 100 and the lower hinge 200 are small, calibrating dial indicator 6 to zero using calibration block 7 before measurement can improve measurement accuracy. Understandably, by adjusting dial indicator 6, when the dial indicator 6 reading is zero, the measuring rod 62 has an initial measuring pressure. When the distance between the outer wall of the detection frame and the extension rod increases, the measuring rod 62 of dial indicator 6 can still abut against the extension rod, and the measuring rod 62 can still be subjected to measuring pressure, so that dial indicator 6 can display the reading normally.

[0049] To improve the calibration accuracy and measurement precision of the dial indicator 6, and to ensure that the measuring rod 62 of the dial indicator 6 can be inserted into the calibration hole 71 and the detection through hole 5 parallel to or coinciding with the axis of the hole, preventing the measuring rod 62 from tilting, preferably, the diameter of the calibration hole 71 and the diameter of the detection through hole 5 of the calibration block 7 are both 1.02-1.05 times the diameter of the measuring rod 62 of the dial indicator 6, and the depth of the detection through hole 5 is 40%-60% of the length of the measuring rod 62 of the dial indicator 6.

[0050] The present invention also provides a method for detecting the coaxiality of a car door hinge, using the inspection tool described above, and the method includes the following steps:

[0051] Step 1: Assemble the first pin 21a onto the upper hinge 100 and the second pin 21b onto the lower hinge 200.

[0052] Step 2: After calibrating the dial indicator 6 using a standard block, insert the dial indicator 6 into the X-direction detection hole and the Y-direction detection hole of the first detection frame 4a and the second detection frame 4b respectively, and measure the deviation of the first extension rod 22a and the second extension rod 22b, including the X-direction deviation L1x of the first extension rod 22a, the Y-direction deviation L1y of the first extension rod 22a, the X-direction deviation L2x of the second extension rod 22b, and the Y-direction deviation L2y of the second extension rod 22b.

[0053] Step 3: Check whether the deviation of the first extension rod 22a and the second extension rod 22b is within the acceptable range; if the deviation is within the acceptable range, it indicates that the coaxiality of the upper hinge 100 and the lower hinge 200 meets the requirements; if the deviation exceeds the acceptable range, calculate the deviation of the first pin 21a and the second pin 21b based on the deviation of the first extension rod 22a and the second extension rod 22b, the ratio of the length of the first extension rod 22a to the length of the first pin 21a, and the ratio of the length of the second extension rod 22b to the length of the second pin 21b, including the X-direction deviation L1x′ and the Y-direction deviation L1y′ of the first pin 21a, the X-direction deviation L2x′ and the Y-direction deviation L2y′ of the second pin 21b;

[0054] Step 4: Adjust the mounting fixture of the corresponding hinge according to the deviation between the first pin 21a and the second pin 21b.

[0055] Step 5: Install the upper hinge 100 and the lower hinge 200 using the adjusted mounting fixture;

[0056] Step 6: Return to step 1 until the deviation between the first extension rod 22a and the second extension rod 22b is within the acceptable range.

[0057] When installing the fixture, slightly rotate the first universal joint 3a to assemble the first pin 21a onto the upper hinge 100, then move the second universal joint 3b along the slide rail 11 toward the center of the handle 1, and then slightly rotate the second universal joint 3b to assemble the second pin 21b onto the lower hinge 200. The installation is convenient and quick.

[0058] Specifically, the method for adjusting the hinge mounting fixture includes: comparing the X-direction and Y-direction deviations of the first pin 21a and the second pin 21b respectively; when the X-direction and / or Y-direction deviations are different, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction offset deviations are the same, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the deviation value in each direction.

[0059] In actual production, it is difficult to achieve a perfectly zero-clearance fit between the locating pins or blocks of the mounting fixture. Furthermore, some special areas may use materials with lower hardness, such as nylon or polyurethane, for the locating surfaces. Adjusting the hinge mounting fixture based on the deviation measured by dial indicator 6 can easily lead to a mismatch between the adjustment amount and the actual effect. On the other hand, excessive adjustment of the mounting fixture can easily cause over-adjustment, posing a risk of functional problems and impacting production. Therefore, to reduce production risks, the mounting fixture can be adjusted in steps, from 1 / 3 to 1 / 2 of the deviation measured by dial indicator 6.

[0060] For example, the ratio of the length of the first extension rod 22a to the length of the first pin 21a, and the ratio of the length of the second extension rod 22b to the length of the second pin 21b are 10. Using dial indicator 6, the following measurements were obtained: the X-direction deviation L1x of the first extension rod 22a is -2mm, and the Y-direction deviation L1y is +3mm; the X-direction deviation L2x of the second extension rod 22b is +2mm, and the Y-direction deviation L2y is -4mm. According to the similar triangle criterion, the X-direction deviation L1x′ of the first pin 21a is +0.2mm, and the Y-direction deviation L1y′ is -0.3mm; the X-direction deviation L2x′ of the second pin 21b is -0.2mm, and the Y-direction deviation L2y′ is +0.4mm. This indicates that the upper hinge 100 is offset by 0.2mm in the +X direction and 0.3mm in the -Y direction, and the lower hinge 200 is offset by 0.2mm in the -X direction and 0.4mm in the +Y direction. The X-direction deviation of the first pin 21a is the same as that of the second pin 21b. The Y-direction deviation of the second pin 21b is greater than that of the first pin 21a. If the mounting fixture of the hinge is adjusted according to half of the deviation measured by dial indicator 6, the mounting fixture of the upper hinge 100 needs to be adjusted by 0.1mm in the -X direction, the mounting fixture of the lower hinge 200 needs to be adjusted by 0.1mm in the +X direction, and the mounting fixture of the lower hinge 200 needs to be adjusted by 0.2mm in the -Y direction. After adjusting the hinge mounting fixture, install the upper hinge 100 and lower hinge 200, and repeat steps 1 and 2. Check the deviation between the first extension rod 22a and the second extension rod 22b, and determine if the deviation is within the acceptable range. If it is, the hinge mounting fixture adjustment is qualified, and the coaxiality of the upper hinge 100 and lower hinge 200 installed using this fixture meets the requirements. If the deviation exceeds the acceptable range, the hinge mounting fixture needs to be readjusted until the deviation between the first extension rod 22a and the second extension rod 22b is within the acceptable range. Since the coaxiality deviation of the upper hinge 100 and lower hinge 200 is generally required to be less than 0.2mm, to ensure that the coaxiality deviation of the upper hinge 100 and lower hinge 200 installed using the adjusted mounting fixture is within the required range, preferably, the acceptable range for the deviation of the first extension rod 22a and the second extension rod 22b is 0-1.5mm. For example, the acceptable range of the deviation between the first extension rod 22a and the second extension rod 22b can be set to 0, indicating that it is acceptable when the upper hinge 100 and the lower hinge 200 are completely coaxial, or it can be set to 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, etc.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A door hinge coaxiality inspection tool, characterized in that, The device includes a handle, a first detection rod, and a second detection rod. The first detection rod and the second detection rod are connected to both ends of the handle via a first universal joint and a second universal joint, respectively. The first detection rod includes a first pin and a first extension rod located on both sides of the first universal joint, and the first pin is adapted to the upper hinge. The second detection rod includes a second pin and a second extension rod located on both sides of the second universal joint, and the second pin is adapted to the lower hinge. The handle is provided with a first detection frame and a second detection frame that are parallel to each other. Both the first and second detection frames are annular. The first extension rod extends into the first detection frame, and the second extension rod extends into the second detection frame. The free ends of the first and second extension rods have circular or square cross-sections. The cross-sections of the first and second detection frames are both circular or square rings, and the two adjacent sides of the square extend along the X and Y directions, respectively. The first and second detection frames are identical, and the first and second detection rods are identical. When the axis of the first detection rod is collinear with the center line of the first detection frame, and the axis of the second detection rod is collinear with the center line of the second detection frame, the axes of the first and second detection rods are collinear. Both the first and second detection frames are provided with detection through holes for inserting dial indicators.

2. The door hinge coaxiality inspection tool according to claim 1, characterized in that, The detection via includes an X-direction detection via and a Y-direction detection via, wherein the X-direction detection via extends along the X direction and the Y-direction detection via extends along the Y direction.

3. The door hinge coaxiality inspection tool according to claim 1, characterized in that, The first pin and the second pin are respectively close to the first end and the second end of the handle, and the first extension rod and the second extension rod extend toward the middle of the handle; the first universal joint and / or the second universal joint are connected to the handle via a slide rail.

4. The door hinge coaxiality inspection tool according to claim 1, characterized in that, The length of the first extension rod is 8-12 times the length of the first pin; the length of the second extension rod is 8-12 times the length of the second pin.

5. The door hinge coaxiality inspection tool according to claim 1, characterized in that, The first pin and the second pin are configured as pin shafts, and the maximum diameters of the first pin and the second pin are the minimum values ​​of the hinge hole diameters of the upper hinge and the lower hinge, respectively. The accuracy of the first pin and the second pin is 1 / 10 to 1 / 3 of the hinge hole tolerances of the upper hinge and the lower hinge, respectively. The first pin and the second pin are configured as sleeves, and the minimum hole diameters of the sleeve holes of the first pin and the second pin are the maximum values ​​of the hinge shaft diameters of the upper hinge and the lower hinge, respectively. The accuracy of the sleeve holes of the first pin and the second pin is 1 / 10 to 1 / 3 of the hinge hole tolerances of the upper hinge and the lower hinge, respectively.

6. The door hinge coaxiality inspection tool according to any one of claims 1-5, characterized in that, The inspection tool also includes a dial indicator for detecting the distance between the free end of the first extension rod and the inner wall of the first inspection frame, and the distance between the free end of the second extension rod and the inner wall of the second inspection frame.

7. The door hinge coaxiality inspection tool according to claim 6, characterized in that, The fixture also includes a calibration block with a calibration hole. When the dial indicator is inserted into the calibration hole, the fixing rod of the dial indicator abuts against the outer wall of the calibration block, and the measuring rod abuts against the bottom wall of the calibration hole. When the axis of the first detection rod is collinear with the center line of the first detection frame and the axis of the second detection rod is collinear with the center line of the second detection frame, the distance from the outer wall of the first detection frame to the first extension rod and the distance from the outer wall of the second detection frame to the second extension rod are the same as the depth of the calibration hole.

8. The door hinge coaxiality inspection tool according to claim 7, characterized in that, The diameter of the calibration hole and the diameter of the detection through hole of the calibration block are both 1.02-1.05 times the diameter of the measuring rod of the dial indicator, and the depth of the detection through hole is 40%-60% of the length of the measuring rod of the dial indicator.

9. A method for detecting the coaxiality of a car door hinge, characterized in that, The method of performing inspection using the fixture according to claim 7 or 8 includes the following steps: Step 1: Assemble the first pin onto the upper hinge and the second pin onto the lower hinge. Step 2: After calibrating the dial indicator using a standard block, insert the dial indicator into the X-direction detection hole and Y-direction detection hole of the first detection frame and the second detection frame respectively, and measure the deviation of the first extension rod and the second extension rod, including the X-direction deviation L1x of the first extension rod, the Y-direction deviation L1y of the first extension rod, the X-direction deviation L2x of the second extension rod, and the Y-direction deviation L2y of the second extension rod. Step 3: Check whether the deviation between the first extension rod and the second extension rod is within the acceptable range. If the deviation is within the acceptable range, it indicates that the coaxiality of the upper hinge and the lower hinge meets the requirements. If the deviation exceeds the acceptable range, calculate the deviation between the first pin and the second pin based on the deviation between the first extension rod and the second extension rod, the ratio of the length of the first extension rod to the length of the first pin, and the ratio of the length of the second extension rod to the length of the second pin. This includes the X-direction deviation L1x′ of the first pin, the Y-direction deviation L1y′ of the first pin, the X-direction deviation L2x′ of the second pin, and the Y-direction deviation L2y′ of the second pin. Step 4: Adjust the mounting fixture of the corresponding hinge according to the deviation between the first pin and the second pin; Step 5: Install the upper and lower hinges using the adjusted mounting fixture; Step 6: Return to Step 1 until the deviation between the first extension rod and the second extension rod is within the acceptable range.

10. The method for detecting the coaxiality of a car door hinge according to claim 9, characterized in that, The method for adjusting the hinge mounting fixture includes: comparing the X-direction and Y-direction deviations of the first pin and the second pin respectively; when the X-direction and / or Y-direction deviations are different, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the larger deviation value in each direction; when the X-direction and / or Y-direction deviations are the same, adjusting the mounting fixture of the corresponding hinge in the opposite direction according to 1 / 3 to 1 / 2 of the deviation value in each direction.

11. The method for detecting the coaxiality of a car door hinge according to claim 9, characterized in that, The acceptable range for the deviation between the first extension rod and the second extension rod is 0-1.5mm.

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