Gear double-sided meshing comprehensive measurement device with excircle run-out detection function

Abstract

The utility model relates to the technical field of automobile part detection, and particularly discloses a gear double-face meshing comprehensive measuring device with an outer circle run-out detection function, which comprises a standard gear arranged on a working table and two ejector pins arranged on the working table, the ejector pins are arranged at an interval, the tips of the ejector pins are oppositely arranged, and the standard gear and the ejector pins are arranged on the working table. The two ends of the rotating shaft abut against the end face of a to-be-measured gear so that the position of the to-be-measured gear can be restrained and the to-be-measured gear can rotate in the axis direction of the rotating shaft. The mounting seat has a basic height and is vertically arranged on the workbench; and the detection mechanism is arranged on the mounting seat so as to detect the excircle run-out information of the gear to be detected. Therefore, the technical problem that the existing measuring device is difficult to accurately detect the size parameter of the shaft gear is solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts testing technology, specifically to a comprehensive measuring device for double-sided meshing of gears with external circular runout detection. Background Technology

[0002] With the rapid development of the global new energy vehicle industry, especially the electric vehicle market, the market's requirements for the overall quality of new energy vehicles are becoming increasingly stringent. In the field of precision machining of automotive parts, such as... Figure 1 As shown, currently, when performing dual-meshing inspection of the tooth surface of pin shaft gears, a measuring device consisting of upper and lower centers and a standard gear is commonly used to detect parameters such as Fr (radial runout), Fi (tangential combined deviation), fi (radial combined deviation), and span distance of the gear being measured. This measuring device mainly includes a lower center 1, a workpiece 2, an upper center 3, a standard gear 4, and a worktable 5. During inspection, the workpiece 2 is placed on the lower center 1, and the upper center 3 presses down to clamp and fix the product. After the workpiece 2 is in place, the standard gear 4 automatically performs the inspection according to the equipment's programmed procedure. During this process, the workpiece 2 must rotate at least one revolution.

[0003] However, the following technical problems exist when using the aforementioned testing device to measure the parameters of the gear under test: In the gear grinding process, the machining is based on the center holes at both ends of the workpiece, and the tooth surface accuracy is closely related to the center holes; however, in the product assembly stage, the bearings are press-fitted based on the outer circles of the bearings at both ends, and the tooth surface accuracy is again related to the outer circles of the two bearings, while the center holes at both ends do not participate in the assembly process. These two different reference relationships can cause some problems. For example, when the runout of the outer circles of the bearings at both ends exceeds the tolerance, and the gear grinding stage uses the center holes at both ends for positioning, and then assembles the gears based on the outer circles of the bearings after grinding, abnormal tooth meshing will occur. For such abnormal workpieces, the existing dual-meshing detection technology cannot effectively identify them, leading to defective parts being mixed with qualified products, causing material mixing problems. This not only makes the gear under test difficult to assemble with other gears under test, consuming a lot of time and manpower and reducing assembly efficiency, but may also cause the gear under test to become scrap, resulting in material waste.

[0004] In summary, given the current limitations of measuring devices in accurately detecting the dimensional parameters of shaft gears, there is an urgent need to optimize and improve their structure. This would optimize the measurement process, ensure the accuracy and reliability of the measurement results, and guarantee that the quality of the processed gears strictly meets design requirements, thereby satisfying the ever-growing high-quality demands of the new energy vehicle industry. Utility Model Content

[0005] The purpose of this invention is to provide a comprehensive measuring device for dual-sided meshing of gears with external circular runout detection, which can solve the technical problem that existing measuring devices are unable to accurately detect the dimensional parameters of shaft gears.

[0006] This utility model is achieved through the following technical solution:

[0007] A comprehensive measuring device for dual-sided meshing of gears with external circular runout detection includes a standard gear mounted on a worktable; the measuring device also includes:

[0008] The ejector pins are arranged on the worktable. Two ejector pins are arranged at intervals. The tips of the ejector pins are arranged opposite each other. They are used to hold the end face of the gear to be tested from both ends, so as to constrain the position of the gear to be tested and make it rotate along its axial direction.

[0009] Mounting base, having a base height and vertically mounted on the workbench; and...

[0010] The detection mechanism is mounted on the mounting base to detect the runout information of the outer circle of the gear under test.

[0011] Alternatively, the detection mechanism may be configured in two sets and spaced apart on the mounting base.

[0012] Alternatively, the detection mechanism can be movably mounted on the mounting base via a positioning block.

[0013] Alternatively, the positioning block is movably mounted on the mounting base; the mounting base or the positioning block is further provided with a screw so that when the screw is turned, the positioning block can be moved or locked relative to the mounting base.

[0014] Alternatively, the screw may be provided with an operating handle.

[0015] Alternatively, the mounting base is provided with a rack, and the positioning block is provided with a toothed groove that matches the rack.

[0016] Alternatively, the mounting base is provided with a guide groove, the positioning block is embedded in the guide groove, and the mounting base is provided with a bolt, so that when the bolt is turned, the positioning block can move or lock relative to the mounting base.

[0017] Alternatively, the mounting base may be provided with a protective cover on its outer periphery.

[0018] Alternatively, the detection mechanism may be equipped with a laser displacement sensor.

[0019] Alternatively, the ejector pin is located between the mounting base and the standard gear.

[0020] Through the above technical solution, the mounting base has a basic height and is vertically set on the worktable, providing stable support for the testing mechanism and ensuring its positional accuracy during the testing process, thereby guaranteeing the accuracy of the external diameter runout testing data. The ejector pins abut against the end face of the gear under test from both ends, constraining its position and limiting its rotation direction. This positioning method simulates the state of the product during actual assembly with the bearing's outer diameter as the reference, ensuring consistency between the testing reference and the assembly reference. This effectively avoids missed detections of abnormal tooth meshing caused by inconsistent references, improving the accuracy and reliability of the testing results. The testing mechanism works in conjunction with the standard gear to achieve synchronous acquisition of external diameter runout information and tooth meshing testing data. Compared to traditional testing devices that can only test single tooth surface parameters, this measuring device can comprehensively acquire key gear parameter information. By comprehensively analyzing this data, gear quality can be judged more accurately, preventing defective products from being mixed with qualified products. Because the testing agency uses non-contact testing technology, it can complete the external diameter runout test without direct contact with the gear under test, avoiding the damage to the gear surface that may be caused by traditional contact testing. At the same time, it improves testing efficiency, shortens testing time, and meets the needs of the new energy vehicle industry for high-quality and high-efficiency production. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the detection device described in the background art, wherein the gear to be tested is placed in the processing position and is in a clamping state;

[0023] Figure 2 This is a schematic diagram of the structure of the gear double-sided meshing comprehensive measuring device with external circular runout detection provided by this utility model in one embodiment, wherein the gear to be tested is placed in the processing position and is in a clamping state, and the protective cover has been removed;

[0024] Figure 3 This is a three-dimensional structural diagram of a comprehensive measuring device for double-sided meshing of gears with external circular runout detection provided by this utility model in one embodiment. The gear to be tested has been removed to show the internal structure.

[0025] Figure 4 This is a schematic diagram of the structure of the comprehensive measuring device for double-sided meshing of gears with external circular runout detection provided by this utility model in one embodiment, wherein the gear to be tested is placed in the machining position and is in a clamping state;

[0026] Figure 5 This is a front view structural schematic diagram of another embodiment of the comprehensive measurement device for double-sided meshing of gears with external circular runout detection provided by this utility model.

[0027] The attached diagram shows the following markings and corresponding component names: 1-Workbench, 2-Standard gear, 3-Ejector pin, 4-Gear to be tested, 5-Mounting base, 6-Detection mechanism, 7-Positioning block, 8-Rack, 9-Protective cover. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that while the description of these embodiments is intended to aid in understanding the present invention, it does not constitute a limitation thereof. The specific structural and functional details disclosed herein are only for describing exemplary embodiments of the present invention. However, the present invention may be embodied in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0029] According to a specific embodiment of this disclosure, a comprehensive measuring device for dual-sided meshing of gears with external circular runout detection is provided. Wherein, Figures 2 to 5 Specific embodiments thereof are shown.

[0030] See Figures 2 to 5 As shown, the gear double-sided meshing comprehensive measuring device for detecting external circular runout includes a standard gear 2 mounted on a worktable 1. The measuring device also includes: two ejector pins 3 mounted on the worktable 1, spaced apart, with their tips facing each other, used to abut the end faces of the gear 4 to be tested from both ends, thereby constraining the position of the gear 4 and causing it to rotate along its axial direction; a mounting base 5, having a base height and vertically mounted on the worktable 1; and a detection mechanism 6 mounted on the mounting base 5, capable of detecting the external circular runout information of the gear 4 to be tested. By non-contactly detecting the bearing's external circular displacement, the bearing's external circular runout is calculated, and tooth surface meshing detection data can be simultaneously detected.

[0031] This measuring device is based on the principle of dual-reference collaborative detection. It uses a pin 3 to constrain the position of the gear 4 under test, allowing it to rotate only along its axial direction, simulating the actual assembly process with the outer circle of the bearing as the reference. Simultaneously, the detection mechanism 6 on the mounting base 5 employs non-contact detection technology to monitor the displacement changes of the outer circle of the gear 4 under test in real time, calculating the outer circle runout data. Meanwhile, the standard gear 2 meshes with the gear 4 on both sides, synchronously collecting tooth surface meshing detection data during gear rotation. Combining and analyzing the outer circle runout data with the tooth surface meshing data allows for accurate determination of gear quality, avoiding the problem of missed defects due to inconsistent references.

[0032] During testing, the gear 4 to be tested is placed on the workbench 1. Two spaced-apart pins 3 with their tips facing each other hold the end faces of the gear 4 from both ends. The pins 3 constrain the position of the gear 4, allowing it to rotate only around its own axis. The testing mechanism 6 starts working, detecting the external runout of the gear 4 in a non-contact manner. Simultaneously, the standard gear 2 meshes with the gear 4 on both sides according to a preset program. During the rotation of the gear 4, tooth surface meshing detection data, such as Fr (radial runout), Fi (tangential combined deviation), fi (radial combined deviation), and span distance, are collected synchronously. The external runout data acquired by the testing mechanism 6 and the tooth surface meshing data acquired by the standard gear 2 are transmitted to the control system. The control system performs comprehensive analysis of the two sets of data and determines whether the gear 4 is qualified according to the preset pass / fail criteria. If the data exceeds the allowable range, the gear is determined to be defective.

[0033] Through the above technical solution, the mounting base 5 has a basic height and is vertically set on the workbench 1, providing stable support for the testing mechanism 6 and ensuring the positional accuracy of the testing mechanism 6 during the testing process, thereby ensuring the accuracy of the external diameter runout testing data. The ejector pins 3 abut against the end face of the gear 4 to be tested from both ends, constraining its position and limiting its rotation direction. This positioning method simulates the state of the product during actual assembly with the bearing's outer diameter as the reference, ensuring that the testing reference is consistent with the assembly reference. This effectively avoids missed detections of abnormal tooth meshing caused by inconsistent references, improving the accuracy and reliability of the testing results. The testing mechanism 6 cooperates with the standard gear 2 to achieve synchronous acquisition of external diameter runout information and tooth meshing testing data. Compared to traditional testing devices that can only test tooth surface parameters, this measuring device can comprehensively acquire key parameter information of the gear. By comprehensively analyzing this data, the gear quality can be judged more accurately, preventing defective products from being mixed with qualified products. Because the testing mechanism 6 adopts non-contact testing technology, it can complete the outer circle runout test without direct contact with the gear 4 under test, avoiding the damage to the gear surface that may be caused by traditional contact testing. At the same time, it improves testing efficiency, shortens testing time, and meets the needs of the new energy vehicle industry for high-quality and high-efficiency production.

[0034] In one embodiment provided in this disclosure, the detection mechanism 6 is configured in two sets and spaced apart on the mounting base 5. The two sets of detection mechanisms 6 correspond to the outer diameters of the bearings at both ends of the gear 4 to be tested (i.e., the positioning reference during actual assembly), and can simultaneously detect the runout (such as radial runout, coaxiality, etc.) of the outer diameters at both ends. Bidirectional detection, by comparing the data at both ends, directly exposes the overall coaxiality defects of the gear, resolving the contradiction between "grinding with the center hole for positioning" and "assembly with the bearing outer diameter for positioning" reference conversion. This provides a more comprehensive and reliable technical solution for the precision inspection of shaft gears, ensuring the quality of new energy vehicle components.

[0035] In this disclosure, the testing mechanism 6 is movably mounted on the mounting base 5 via the positioning block 7. Adjusting the lateral position (moving along the gear axis) of the testing mechanism 6 using the positioning block 7 allows for precise alignment of the two sets of testing mechanisms 6 with the outer diameters of the bearings at both ends of different gears, avoiding the problem of "large-size gears being undetectable and small-size gears having blind spots" caused by a fixed mechanical structure. The movable design of the positioning block 7 allows for flexible adjustment of the longitudinal position (moving perpendicular to the gear axis) of the testing mechanism 6 according to process requirements. When testing the outer diameter, the positioning block 7 moves the testing mechanism 6 directly above the outer diameter of the bearing; when testing the tooth surface, the testing mechanism 6 can be temporarily removed to avoid interfering with the meshing process of the standard gear 2.

[0036] In one embodiment, the positioning block 7 is movably mounted on the mounting base 5; the mounting base 5 or the positioning block 7 is also provided with a screw, so that when the screw is turned, the positioning block 7 can move or lock relative to the mounting base 5. The mounting base 5 serves as a fixed reference and is a columnar or plate-shaped structure with guide grooves or guide rails (such as dovetail grooves or T-slots) machined on its surface to provide movement guidance for the positioning block 7. The positioning block 7 is mounted on the outside of the mounting base 5, and its inner wall matches the contact surface of the mounting base 5 (such as a semi-circular annular contact surface), and has a threaded hole adapted to the screw. The screw passes through the threaded hole of the positioning block 7, with one end abutting against the mounting base 5 (or fixed to the mounting base 5 by a bearing), and the other end exposed and provided with an operating handle (such as a hexagonal knob or handwheel).

[0037] When the screw is not tightened, there is a gap between the positioning block 7 and the mounting base 5, allowing manual sliding along the axial / radial direction of the mounting base 5 (depending on the direction of the guide structure). After initially moving the positioning block 7 to the target position, slowly turn the screw, utilizing the helix angle principle of the thread drive to convert rotational motion into linear motion (e.g., when the screw pitch is 1mm, the positioning block 7 moves 1mm for every turn of the handwheel), achieving micron-level fine adjustment. When the screw is tightened to its limit position, the inner wall of the positioning block 7 fits tightly against the mounting base 5, and the position is fixed by thread self-locking (or with the anti-loosening nut), ensuring no displacement during the testing process. When the shaft length of the gear 4 under test increases, the testing mechanism 6 needs to be moved a certain distance along the axial direction of the mounting base 5 (gear axis direction). This not only solves the problem of insufficient flexibility of traditional fixed fixtures but also ensures gear quality and prevents defective products from being mixed in.

[0038] Furthermore, an operating handle is provided on the screw. The operating handle provides the user with a clear position for applying force, and the screw can be rotated by rotating the handle without the need for additional tools (such as wrenches, screwdrivers, etc.).

[0039] In this disclosure, the handle has a certain length (creating a lever effect), which amplifies the rotational torque, making the screw-tightening process easier, especially suitable for scenarios requiring frequent adjustments or rapid positioning. By directly rotating the screw with the handle, the positioning block 7 can be moved or locked quickly, reducing the time cost of disassembling and assembling traditional tools. The rotation amplitude and speed of the handle are easy to observe visually and control by hand, making it suitable for scenarios requiring precise adjustment of the position of the detection mechanism 6 (such as adapting to gears 4 of different sizes to be tested).

[0040] In this disclosure, the handle surface is typically designed with anti-slip texture or a round grip to reduce operational errors caused by hand slippage, while also avoiding wear or pressure on the fingers when directly turning the screw.

[0041] Furthermore, the mounting base 5 is provided with a rack 8, and the positioning block 7 is provided with a toothed groove that matches the rack 8.

[0042] The meshing relationship between the rack 8 and the tooth groove provides a clear movement trajectory for the positioning block 7 (linear movement along the extension direction of the rack 8), preventing the positioning block 7 from shifting or wobbling during movement and ensuring the linear accuracy of the position adjustment of the detection mechanism 6. When the positioning block 7 moves to the target position, the meshing gap between the tooth groove and the rack 8 is extremely small, and when the threaded screw (in conjunction with the structure described above) is locked, the engagement between the tooth surfaces creates a mechanical stop effect, significantly improving the positioning block 7's resistance to vibration and impact during the detection process and preventing positional shifts caused by external forces. Combined with the screw handle structure described above, when the handle is rotated, the screw pushes the positioning block 7 along the rack 8, and the meshing between the tooth groove and the rack 8 helps the screw bear lateral loads, reducing the burden on the screw alone and making the adjustment process smoother. The meshing between the tooth groove and the rack 8 requires a certain alignment accuracy to prevent the positioning block 7 from slipping due to accidental contact when not fully locked, thus improving operational safety. The engagement between the rack 8 and the tooth groove solves the problems of accuracy, stability and load capacity during the movement of the positioning block 7 through the precision of mechanical transmission and the reliability of structural locking. It is especially suitable for scenarios with high requirements for detection accuracy, frequent adjustment or operation under complex conditions. It is a classic solution for achieving "precise positioning + reliable locking" in mechanical design.

[0043] In another embodiment, the mounting base 5 is provided with a guide groove, the positioning block 7 is embedded in the guide groove, and the mounting base 5 is provided with a bolt. When the bolt is tightened, the positioning block 7 can move or lock relative to the mounting base 5. Loosening the bolt releases the clamping force of the bolt on the positioning block 7. Because the positioning block 7 is embedded in the guide groove, it can slide along the extension direction of the groove (such as horizontal or vertical direction) to achieve position adjustment. Tightening the bolt causes the end of the bolt to press against the positioning block 7 (or indirectly press through a shim), making the positioning block 7 fit tightly against the groove wall of the guide groove. The frictional force generated by the axial pressure of the bolt locks the position of the positioning block 7 in the guide groove, preventing it from moving.

[0044] The guide groove defines a unique movement trajectory for the positioning block 7 (along the direction of the guide groove), restricting its degrees of freedom perpendicular to the groove direction (such as lateral offset and rotation), ensuring the linearity of the movement of the detection mechanism 6. By tightening the bolts, the positioning block 7 is pressed and fixed in the guide groove, forming a rigid connection to resist external forces (such as vibration and contact force) during the detection process.

[0045] In one embodiment, a protective cover 9 is provided on the outer periphery of the mounting base 5. The protective cover 9 can block foreign objects, thereby providing a certain degree of protection for the mounting base 5.

[0046] In this disclosure, the detection mechanism 6 is equipped with a laser displacement sensor. The laser beam emitted by the laser displacement sensor is focused onto the surface of the object being measured through an optical system, acquiring distance data without physical contact and capturing transient displacement changes. This avoids measurement errors caused by probe wear in traditional contact sensors (such as dial indicators), making it particularly suitable for high-precision, high-frequency detection scenarios (such as semiconductor wafer thickness measurement and precision guide rail straightness measurement). Thus, it overcomes the limitations of traditional measurement methods with its non-contact, high-precision, and fast-response characteristics. Its functional effects are not only reflected in improved detection accuracy and efficiency, but also in driving the optimization of automated systems through real-time data, facilitating the digital and intelligent transformation of industrial scenarios.

[0047] In one embodiment, in this disclosure, the ejector pin 3 is located between the mounting base 5 and the standard gear 2, ensuring that the center distance between the standard gear 2 and the mating gear (such as the gear under test or the transmission gear) remains constant, thereby guaranteeing that the tooth surface meshing clearance (backlash) and contact accuracy meet the design standards. The axis of the ejector pin 3 and the axis of the mounting base 5 (shaft) must be strictly coaxial. By pressing the ejector pin 3 against the gear, the gear axis can be forced to coincide with the axis of the mounting base 5, eliminating coaxiality errors during the assembly process.

[0048] The above specific embodiments further illustrate the purpose, technical solution and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

[0049] Finally, it should be noted that this utility model is not limited to the above-described optional embodiments, and anyone can derive other various forms of products under the guidance of this utility model. The above specific embodiments should not be construed as limiting the scope of protection of this utility model, which should be determined by the claims, and the description can be used to interpret the claims.

Claims

1. A comprehensive measuring device for dual-sided meshing of gears with external circular runout detection, comprising a standard gear mounted on a worktable, characterized in that, The measuring device also includes: The ejector pins are arranged on the worktable. Two ejector pins are arranged at intervals. The tips of the ejector pins are arranged opposite each other. They are used to hold the end face of the gear to be tested from both ends, so as to constrain the position of the gear to be tested and make it rotate along its axial direction. Mounting base, having a base height and vertically mounted on the workbench; and... The detection mechanism is mounted on the mounting base to detect the runout information of the outer circle of the gear under test.

2. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 1, characterized in that, The detection mechanism is configured in two sets and is spaced apart on the mounting base.

3. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 1, characterized in that, The detection mechanism is movably mounted on the mounting base via a positioning block.

4. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 3, characterized in that, The positioning block is movably mounted on the mounting base; the mounting base or the positioning block is also provided with a screw, so that when the screw is turned, the positioning block can be moved or locked relative to the mounting base.

5. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 4, characterized in that, The screw is equipped with an operating handle.

6. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 4, characterized in that, The mounting base is provided with a rack, and the positioning block is provided with a toothed groove that matches the rack.

7. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 3, characterized in that, The mounting base is provided with a guide groove, the positioning block is embedded in the guide groove, and the mounting base is provided with a bolt. When the bolt is turned, the positioning block can move or lock relative to the mounting base.

8. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 1, characterized in that, The mounting base is provided with a protective cover on its outer periphery.

9. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 1, characterized in that, The detection mechanism is equipped with a laser displacement sensor.

10. The comprehensive measuring device for double-sided meshing of gears with external circular runout detection according to claim 1, characterized in that, The ejector pin is located between the mounting base and the standard gear.

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