Bevel gear parameter measuring mechanism and measuring method

Abstract

The invention relates to the technical field of gear detection, in particular to a bevel gear parameter measuring mechanism and a bevel gear parameter measuring method.The bevel gear parameter measuring mechanism comprises a first probe, a second probe, an auxiliary sphere and a positioning tool, the first probe is provided with a first sphere, and the diameter of the first sphere is the same as that of a first set sphere which is located at the large end of a tooth groove and makes contact with the two side faces of the tooth groove of a bevel gear; the second probe is provided with a second ball body, and the second ball body has the same diameter as a second setting ball contacted with the two side surfaces of the tooth groove of the bevel gear and the first setting ball; the auxiliary ball body and the first setting ball have the same diameter; the positioning tool is provided with a tool surface which is matched with the mounting surface of the bevel gear in shape and is tightly jointed with the mounting surface, an upper end surface which is used as a measurement reference surface, and an inner wall which is in contact with the first sphere or the auxiliary sphere. By adopting the measuring mechanism provided by the utility model, the M value and the M value of the bevel gear can be accurately measured.

Description

Technical Field

[0001] The present invention relates to the technical field of gear detection, and in particular to a bevel gear parameter measuring mechanism and a measuring method. Background Art

[0002] Bevel gears are divided into straight bevel gears, spiral bevel gears, etc. This article describes straight bevel gears. When the bevel gears are meshing, the side clearance between the planetary gears and the half-shaft gears will affect the noise and performance of the gearbox. Therefore, controlling the meshing side clearance of the gears is very important for improving the overall performance of the gearbox. In the product molding process, controlling the M value and △M value of the bevel gears is a critical step. The processing quality directly affects the performance of the gearbox, so how to accurately detect it is an important part of the production process.

[0003] The existing detection scheme cannot realize the detection of △M value. Secondly, when detecting the M value, since the tooth surface shape of the bevel gear is an involute, the probe cannot accurately find the M value detection position specified in the drawing, resulting in unreliable measurement results and low repeatability. Summary of the invention

[0004] In order to solve the problem of unreliable gear M value and ΔM value detection results in the prior art, the present invention provides a bevel gear parameter measurement mechanism and a measurement method with reliable detection results.

[0005] The technical solution adopted by the present invention to solve its technical problem is: A bevel gear parameter measuring mechanism, characterized in that it comprises: A first probe having a first sphere, the first sphere having the same diameter as a first setting ball located at the large end of the tooth groove and in contact with both side surfaces of the tooth groove of the bevel gear; A second probe, the second probe having a second sphere, the second sphere having the same diameter as the second setting ball that contacts both side surfaces of the tooth groove of the bevel gear and the first setting ball; An auxiliary sphere, the auxiliary sphere having the same diameter as the first setting sphere; The positioning fixture is provided with a fixture surface that matches the shape of the mounting surface of the bevel gear and is tightly engaged, an upper end surface that serves as a measurement reference surface, and an inner wall that is used to contact the first sphere or the auxiliary sphere.

[0006] Furthermore, the tooling surface is a tooling plane or a tooling cambered surface. The mounting surface of the matching pre-gear is a plane or a cambered surface.

[0007] Furthermore, the positioning tool is also fixed with a tool spindle, and the bevel gear is sleeved on the tool spindle.

[0008] Furthermore, the tooling mandrel and the bevel gear are clearance-fitted or key-connected.

[0009] Furthermore, the positioning tool also includes a center hole, the tool spindle passes through the center hole, and the tool spindle is fixedly connected with a pressure plate for pressing the bevel gear.

[0010] Furthermore, the tooling mandrel is fixedly connected to the pressing plate via screws, and the screws pass through the pressing plate and are threadedly connected to the tooling mandrel.

[0011] Furthermore, a gasket is provided between the mounting surface and the tooling surface, and the edge of the gasket does not exceed the mounting surface. The bevel gear is pressed against the gasket by a pressure plate, a screw and a clamping block, and the pressing force increases the friction between the bevel gear and the gasket, thereby preventing the bevel gear from rotating during the measurement process.

[0012] A measurement method based on the bevel gear parameter measurement mechanism is characterized in that it includes a method for measuring the M value, the axial direction of the bevel gear is arranged along the vertical direction, wherein the M value is the distance between the tooling surface and the highest point of the first sphere, and includes the following steps: S11: Obtain the distance H between the tooling surface and the lowest point of the measuring reference surface along the axial direction of the bevel gear; S12: Place the mounting surface of the bevel gear close to the working surface and fix the bevel gear with a pressure plate; S13: Establishing the origin of the Z axis of the coordinate system on the measurement reference plane; S14: using a three-dimensional coordinate measuring machine with a self-centering function, using the self-centering function, using the first sphere of the first probe to contact the two tooth surfaces of the bevel gear and the inner wall of the tooling to obtain a measuring point PA, the type of which is a midpoint; S15: Output the Z coordinate value of the measuring point PA as ZPA, the first sphere radius of the first probe is RA, then M value=ZPA+RA+H; S16: Rotate the measuring point PA in an array according to the number of bevel teeth of the bevel gear, and the M value of the remaining teeth can be measured.

[0013] Furthermore, a method for measuring a ΔM value is also included, wherein ΔM is the height difference between the highest point of the first sphere and the highest point of the second sphere, comprising the following steps: S21: After the M value measurement is completed, the three-dimensional coordinate measuring machine is set to the pause mode. At this time, an auxiliary ball with the same diameter as the first setting ball is placed in each tooth groove of the bevel gear; S22: Using the self-centering function, a second probe with the same diameter as the second setting ball is used, and the two side surfaces of the tooth groove of the second spherical bevel gear on the second probe and the auxiliary ball are in contact to obtain the measuring point PB, which is a midpoint type; S23: Output the Z coordinate value of the measuring point PB as ZPB, the radius of the second sphere of the second probe is RB, then △M=ZPB+RB-ZPA-RA; S24: Rotate the measuring point PB in an array according to the number of bevel teeth of the bevel gear, and the △M values ​​of the remaining teeth can be measured.

[0014] Furthermore, the distance H between the lowest points of the measuring reference surfaces along the axial direction of the bevel gear is designed to be a fixed value, and the three-coordinate measurement program is updated by regularly reviewing the H value.

[0015] Beneficial effects: (1) The patented measuring mechanism is used to achieve accurate measurement of the M value and △M value of the bevel gear; (2) By designing the tooling and combining the three-coordinate detection solution, the measurement position is guaranteed to be consistent with the drawing requirements, thereby improving the reliability and repeatability of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 This is a test principle diagram of a bevel gear parameter measurement mechanism according to Embodiment 1 of the present invention; Figure 2 This is a test principle diagram of a bevel gear parameter measurement mechanism according to Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of a positioning tool according to Embodiment 2 of the present invention; Figure 4 is a schematic diagram of the test position relationship of the first probe; Figure 5 Schematic diagram of the positional relationship between the second probe and the auxiliary sphere.

[0018] 1. First probe, 11. First sphere, 2. Second probe, 21. Second sphere, 3. Auxiliary sphere, 4. Positioning tool, 411. Tool plane, 412. Tool arc surface, 42. Measuring reference surface, 43. Inner wall, 5. Tool mandrel, 6. Press plate, 7. Screw, 10. First setting ball, 20. Second setting ball. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0024] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0025] Embodiment 1:

[0026] like Figure 1 , 4 5. The present invention provides a bevel gear parameter measuring mechanism, comprising a first probe 1, a second probe 2, an auxiliary sphere 3 and a positioning fixture 4: the first probe 1 is provided with a first sphere 11, the first sphere 11 and a first setting sphere 10 located at the large end of the tooth groove and in contact with both side surfaces of the tooth groove of the bevel gear have the same diameter; the second probe 2 is provided with a second sphere 21, the second sphere 21 and a second setting sphere 20 in contact with both side surfaces of the tooth groove of the bevel gear and the first setting sphere 10 have the same diameter; the auxiliary sphere 3 has the same diameter as the first setting sphere 10; the positioning fixture 4 is provided with a fixture plane 411 that matches the shape of the mounting surface of the bevel gear and is tightly engaged, an upper end surface serving as a measuring reference surface 42 and an inner wall 43 for contacting the first sphere 11 or the auxiliary sphere 3.

[0027] The tooling plane 411 is a plane. The measuring mechanism of this embodiment is suitable for the bevel gear installation surface being a plane, the M value is the distance from the highest point of the first setting ball 10 to the tooling plane 411, and the △M value is the height difference between the highest point of the second setting ball 20 and the highest point of the first setting ball 10; the inner wall 43 of the positioning tool 4 has a diameter of D1, and the outermost side of the first setting ball 10 contacts the inner wall 43 of the positioning tool 4, ensuring that the M value measurement position is consistent with the drawing requirements; After the bevel gear is installed, the tooling plane 411 cannot be directly measured, and the M value needs to be converted from the measurement reference plane 42. Therefore, in order to ensure the measurement accuracy, the smaller the parallelism between the tooling plane 411 and the tooling measurement reference plane 42, the better; The positioning tool 4 is also fixed with a tool mandrel 5, and the bevel gear is sleeved on the tool mandrel 5, and the two are clearance-matched or key-connected. After installation, the length of the tool mandrel 5 is flush with the height of the bevel gear, or slightly lower than the height of the bevel gear.

[0028] The positioning tool 4 also includes a center hole, through which the tool mandrel 5 passes, and the tool mandrel 5 is fixedly connected with a pressing plate 6 for pressing the bevel gear. The other end of the tool mandrel 5 away from the pressing plate 6 can be clamped with the positioning tool 4, or it can be fixedly connected in other ways.

[0029] The tooling mandrel 5 is fixedly connected to the pressing plate 6 by means of screws 7, and the screws 7 pass through the pressing plate 6 and are threadedly connected to the tooling mandrel 5. A gasket is provided between the mounting surface and the tooling plane 411, and the edge of the gasket does not extend beyond the mounting surface, otherwise the part of the bevel gear teeth that extends beyond the bevel gear will interfere with the measurement. The locking screw 7 fixes the bevel gear through the gasket and the tooling mandrel 5, and after locking, ensures that the bevel gear cannot rotate.

[0030] A measurement method based on the bevel gear parameter measurement mechanism includes a method for measuring the M value, wherein the axial direction of the bevel gear is arranged along the vertical direction, wherein the M value is the distance between the tooling plane 411 and the highest point of the first sphere 11, and includes the following steps: S11: Obtaining the distance H1 between the tooling plane 411 and the lowest point of the measuring reference plane 42 along the axial direction of the bevel gear; S12: The mounting surface of the bevel gear is pressed against the working surface, and the bevel gear is fixed with a pressing plate 6; S13: Establishing the origin of the Z axis of the coordinate system on the measurement reference plane 42; S14: using a three-dimensional coordinate measuring machine with a self-centering function, using the self-centering function, using the first sphere 11 of the first probe 1 to contact the two tooth surfaces of the bevel gear and the inner wall 43 of the tooling to obtain a measuring point PA, the type of which is a midpoint; S15: Output the Z coordinate value of the measuring point PA as ZPA, the radius of the first sphere 11 of the first probe 1 is RA, then the M value = ZPA + RA + H1; S16: Rotate the measuring point PA in an array according to the number of bevel teeth of the bevel gear, and the M value of the remaining teeth can be measured.

[0031] Also included is a method for measuring a ΔM value, wherein ΔM is a height difference between a highest point of the first sphere 11 and a highest point of the second sphere 21, comprising the following steps: S21: After the M value measurement is completed, the three-dimensional coordinate measuring machine is set to the pause mode, and an auxiliary ball 3 with the same diameter as the first setting ball 10 is placed in each tooth groove of the bevel gear; S22: Using the self-centering function, a second probe 2 having the same diameter as the second setting ball 20 is used, and the second ball 21 on the second probe 2 contacts the two side surfaces of the tooth groove of the bevel gear and the auxiliary ball 3 to obtain a measuring point PB, which is a midpoint type; S23: Output the Z coordinate value of the measuring point PB as ZPB, the radius of the second sphere 21 of the second probe 2 is RB, then △M=ZPB+RB-ZPA-RA; The calculation process of △M value is as follows: The distance from the highest point of the second setting sphere 20 to the highest point of the first setting sphere 10 can be expressed as △M+2RA, or as ZPB-ZPA+RA+RB, that is, △M+2RA=ZPB-ZPA+RA+RB, therefore, △M=ZPB+RB-ZPA-RA.

[0032] S24: Rotate the measuring point PB in an array according to the number of bevel teeth of the bevel gear, and the △M values ​​of the remaining teeth can be measured.

[0033] The distance H1 between the lowest points of the measuring reference surface 42 along the axial direction of the bevel gear is designed as a fixed value, and the three-coordinate measurement program is updated by regularly reviewing the H1 value. Step S11 can be skipped directly, and the program can be used for automatic measurement, or the formula set in the program can be used to automatically calculate the M value and △M value.

[0034] Embodiment 2:

[0035] like Figures 2~5 A bevel gear parameter measuring mechanism comprises a first probe 1, a second probe 2, an auxiliary sphere 3 and a positioning fixture 4: the first probe 1 is provided with a first sphere 11, the first sphere 11 and a first setting sphere 10 located at the large end of the tooth groove and in contact with both side surfaces of the tooth groove of the bevel gear have the same diameter; the second probe 2 is provided with a second sphere 21, the second sphere 21 and a second setting sphere 20 in contact with both side surfaces of the tooth groove of the bevel gear and the first setting sphere 10 have the same diameter; the auxiliary sphere 3 has the same diameter as the first setting sphere 10; the positioning fixture 4 is provided with a fixture arc surface 412 which matches the shape of the mounting surface of the bevel gear and is tightly engaged, an upper end surface serving as a measuring reference surface 42 and an inner wall 43 for contacting the first sphere 11 or the auxiliary sphere 3.

[0036] The tooling camber 412 is the tooling camber 412. The measuring mechanism of this embodiment is suitable for the case where the bevel gear mounting surface is a camber, the M value is the distance from the highest point of the first setting ball 10 to the tooling plane 411, and the △M value is the height difference between the highest point of the second setting ball 20 and the highest point of the first setting ball 10; the inner wall 43 of the positioning tool 4 has a diameter of D1, and the outermost side of the first setting ball 10 contacts the inner wall 43 of the positioning tool 4, ensuring that the M value measurement position is consistent with the drawing requirements; The positioning tool 4 is also fixed with a tool mandrel 5, and the bevel gear is sleeved on the tool mandrel 5, and the two are clearance-matched. After installation, the length of the tool mandrel 5 is flush with the height of the bevel gear, or slightly lower than the height of the bevel gear. The structure of the tool mandrel 5 in this embodiment can be the same as that in embodiment 1, or other structures can be adopted as long as the positioning of the bevel gear can be achieved.

[0037] A gasket is provided between the mounting surface and the tooling arc surface 412, and the edge of the gasket does not extend beyond the mounting surface. Otherwise, the portion of the bevel gear teeth that extends beyond the bevel gear will interfere with the measurement. The locking screw 7 fixes the bevel gear through the gasket and the tooling mandrel 5, and after locking, ensures that the bevel gear cannot rotate.

[0038] A measurement method based on the bevel gear parameter measurement mechanism includes a method for measuring the M value, wherein the axial direction of the bevel gear is arranged along the vertical direction, wherein the M value is the distance between the tooling arc surface 412 and the highest point of the first sphere 11, and includes the following steps: S11: Obtain the distance H2 between the tooling arc surface 412 and the lowest point of the measuring reference surface 42 along the axial direction of the bevel gear; after the bevel gear is installed, the tooling arc surface 412 cannot be directly measured, but H2 can be measured before the bevel gear is installed on the positioning tool 4, and the positioning tool 4 is clamped by a fixture, etc., and then a gauge with a standard spherical surface or the like is used to assist in the measurement; S12: The mounting surface of the bevel gear is pressed against the working surface, and the bevel gear is fixed with a pressing plate 6; S13: Establishing the origin of the Z axis of the coordinate system on the measurement reference plane 42; S14: using a three-dimensional coordinate measuring machine with a self-centering function, using the self-centering function, using the first sphere 11 of the first probe 1 to contact the two tooth surfaces of the bevel gear and the inner wall 43 of the tooling to obtain a measuring point PA, the type of which is a midpoint; S15: Output the Z coordinate value of the measuring point PA as ZPA, the radius of the first sphere 11 of the first probe 1 is RA, then the M value = ZPA + RA + H2; S16: Rotate the measuring point PA in an array according to the number of bevel teeth of the bevel gear, and the M value of the remaining teeth can be measured.

[0039] Also included is a method for measuring a ΔM value, wherein ΔM is a height difference between a highest point of the first sphere 11 and a highest point of the second sphere 21, comprising the following steps: S21: After the M value measurement is completed, the three-dimensional coordinate measuring machine is set to the pause mode, and an auxiliary ball 3 with the same diameter as the first setting ball 10 is placed in each tooth groove of the bevel gear; S22: Using the self-centering function, a second probe 2 having the same diameter as the second setting ball 20 is used, and the second ball 21 on the second probe 2 contacts the two side surfaces of the tooth groove of the bevel gear and the auxiliary ball 3 to obtain a measuring point PB, which is a midpoint type; S23: Output the Z coordinate value of the measuring point PB as ZPB, the radius of the second sphere 21 of the second probe 2 is RB, then △M=ZPB+RB-ZPA-RA; S24: Rotate the measuring point PB in an array according to the number of bevel teeth of the bevel gear, and the △M values ​​of the remaining teeth can be measured.

[0040] The distance H2 between the lowest points of the measuring reference surface 42 along the axial direction of the bevel gear is designed as a fixed value, and the three-coordinate measurement program is updated by regularly reviewing the H2 value. Step S11 can be skipped directly, and the program can be used for automatic measurement, or the formula set in the program can be used to automatically calculate the M value and △M value.

[0041] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bevel gear parameter measuring mechanism, characterized in that: include: A first probe (1), the first probe (1) having a first sphere (11), the first sphere (11) having the same diameter as a first setting ball (10) located at the large end of the tooth groove and in contact with both side surfaces of the tooth groove of the bevel gear; A second probe (2), the second probe (2) having a second sphere (21), the second sphere (21) having the same diameter as a second setting ball (20) that contacts both side surfaces of the tooth groove of the bevel gear and the first setting ball (10); An auxiliary sphere (3), wherein the auxiliary sphere (3) has the same diameter as the first setting sphere (10); A positioning fixture (4) is provided with a fixture surface that matches the shape of the mounting surface of the bevel gear and is tightly engaged, an upper end surface that serves as a measurement reference surface (42), and an inner wall (43) that is used to contact the first sphere (11) or the auxiliary sphere (3).

2. A bevel gear parameter measuring mechanism according to claim 1, characterized in that: The tooling surface is a tooling plane (411) or a tooling cambered surface (412).

3. A bevel gear parameter measuring mechanism according to claim 1, characterized in that: The positioning tool (4) is also fixed with a tool core shaft (5), and the bevel gear is sleeved on the tool core shaft (5).

4. A bevel gear parameter measuring mechanism according to claim 3, characterized in that: The tooling mandrel (5) is clearance-fitted or key-connected with the bevel gear.

5. A bevel gear parameter measuring mechanism according to claim 3, characterized in that: The positioning tool (4) further comprises a center hole, the tool spindle (5) passes through the center hole, and the tool spindle (5) is fixedly connected to a pressure plate (6) for pressing the bevel gear.

6. A bevel gear parameter measuring mechanism according to claim 5, characterized in that: The tooling mandrel (5) is fixedly connected to the pressing plate (6) via a screw (7), and the screw (7) passes through the pressing plate (6) and is threadedly connected to the tooling mandrel (5).

7. A bevel gear parameter measuring mechanism according to claim 1, characterized in that: A gasket is provided between the installation surface and the tooling surface, and the edge of the gasket does not exceed the installation surface.

8. A measuring method based on the bevel gear parameter measuring mechanism according to any one of claims 1 to 7, characterized in that: The method comprises a method for measuring an M value, wherein the axial direction of the bevel gear is arranged along a vertical direction, wherein the M value is the distance between a tooling surface and a highest point of a first sphere (11), and comprises the following steps: S11: Obtaining the distance H between the tooling surface and the lowest point of the measuring reference surface (42) along the axial direction of the bevel gear; S12: Place the mounting surface of the bevel gear close to the working surface and fix the bevel gear with a pressure plate (6); S13: Establishing the origin of the Z axis of the coordinate system on the measurement reference plane (42); S14: using a three-dimensional coordinate measuring machine with a self-centering function, utilizing the self-centering function, using a first sphere (11) of a first probe (1) to contact two tooth surfaces of the bevel gear and an inner wall (43) of a tooling, and obtaining a measuring point PA, the measuring point type of which is a midpoint; S15: Output the Z coordinate value of the measuring point PA as ZPA, the radius of the first sphere (11) of the first probe (1) is RA, then the M value = ZPA + RA + H; S16: Rotate the measuring point PA in an array according to the number of bevel teeth of the bevel gear, and the M value of the remaining teeth can be measured.

9. The measuring method of the bevel gear parameter measuring mechanism according to claim 8, characterized in that: Also included is a method for measuring a ΔM value, wherein ΔM is the height difference between the highest point of the first sphere (11) and the highest point of the second sphere (21), comprising the following steps: S21: After the M value measurement is completed, the three-dimensional coordinate measuring machine is set to a pause mode, and an auxiliary ball (3) having the same diameter as the first setting ball (10) is placed in each tooth groove of the bevel gear; S22: using a self-centering function, using a second probe (2) having the same diameter as the second setting ball (20), the second ball (21) on the second probe (2) contacts the two side surfaces of the tooth groove of the bevel gear and the auxiliary ball (3), and obtaining a measuring point PB, the measuring point type of which is a midpoint; S23: Output the Z coordinate value of the measuring point PB as ZPB, the radius of the second sphere (21) of the second probe (2) is RB, then △M=ZPB+RB-ZPA-RA; S24: Rotate the measuring point PB in an array according to the number of bevel teeth of the bevel gear, and the △M values ​​of the remaining teeth can be measured.

10. The measuring method of the bevel gear parameter measuring mechanism according to claim 8, characterized in that: The distance H between the lowest points of the measuring reference surface (42) along the axial direction of the bevel gear is designed to be a fixed value, and the three-coordinate measurement program is updated by regularly reviewing the H value.

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