Worm and gear clearance detection device

Abstract

The utility model discloses a worm gear and worm clearance detection device, which relates to the field of component detection and consists of a worm locking part, a worm gear and worm assembly chamber, a torque applying assembly and a clearance measuring assembly. The worm locking piece is inserted into the coupler connected with the worm through the clamping jaw, the clamping jaw pressing piece applies pressure to the clamping jaw so as to fasten the clamping jaw, the worm is fixed, and radial run-out of the worm is eliminated. The torque applying assembly is connected with the worm gear and applies torque to the worm gear. And the gap measuring assembly is connected with the torque applying assembly to measure the gap. The worm is fixed by the worm locking piece, so that the worm is only stressed in the axial direction and is not stressed in the radial direction, the measurement error is reduced, and the torque applying assembly can quantitatively apply the torque, so that the test reliability is improved.

Description

Technical Field

[0001] The utility model relates to the field of component detection, in particular to a worm gear clearance detection device for a clearance test of an EPS worm gear transmission mechanism. Background Art

[0002] The electric power steering system, referred to as EPS, is the actuator that realizes the steering function of the vehicle. According to the automotive industry standard QC / T1081-2017, when developing EPS, the product's dimensions, performance, reliability, harmful substances, etc. must be systematically verified. This utility model is a fixed tool for detecting the clearance of the EPS worm gear transmission mechanism.

[0003] Most of the current test tools are cumbersome to operate, and the worm locking method is relatively complicated. For example, the "EPS pipe column worm gear meshing gap detection device" disclosed in announcement number CN112113487B uses a clamping rod to apply pressure to the worm from the side of the worm to fix the worm. However, this fixing method has some defects, and its measurement has large errors. The clamping rod converts the axial force into a radial force, and the radial force applied to the worm is uneven, and the worm is prone to radial displacement, affecting the accuracy of the measurement. This may cause the measured gap to be too small, resulting in the possibility that unqualified products may be mistakenly judged as qualified, affecting the product yield. In addition, when applying torque, the torque is increased by turning the handle on the other end of the worm. Since the handle is not necessarily kept in a horizontal state, the applied torque is difficult to quantify, and the measurement error of the gap between the worm and the worm is large. Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides a worm gear clearance detection device. The worm fixing fixture screws a claw pressing piece into the worm locking disk, allowing the claw pressing piece to contact the claw, pushing the claw to feed axially, and allowing the claw to contact the coupling connected to the worm. After the claw is fed axially to a certain extent, the conical inner wall of the claw contacts the coupling, generating a hard limit, and the nut cannot be screwed in any further, thereby locking the worm in the axial position. In the process of locking the worm, the contact force between the claw and the coupling is always only axial force, and no radial force is applied, resulting in a small error during measurement. After the worm is axially fixed, a torque is applied by fixing a balance plate and setting weights on the balance plate. The displacement of the worm wheel can be read through a micrometer fixed on the instrument fixing table and connected to the balance plate. The displacement is then converted into an angle by calculation to measure the clearance between the worm gear when a certain torque is applied.

[0005] The utility model achieves the above technical objectives through the following technical means.

[0006] A worm and worm gear clearance detection device, comprising a worm, a worm gear and a worm and worm gear assembly chamber. A claw pressing member is connected to a worm locking disc. A claw penetrates through the worm locking disc, and the claw is inserted on a coupling.

[0007] The worm gear is connected to a torque application assembly, and the torque application assembly is connected to a clearance measurement assembly.

[0008] Further, the main body part of the claw is in surface contact with a claw limiting surface provided on the worm locking disc. Claws are provided at the lower part of the main body part of the claw. The claws are inserted on the coupling, and the coupling is installed on the worm.

[0009] Further, a claw adjustment groove is provided on the upper end surface of the claw. A claw limiting platform extends outward from the upper end surface of the claw. The claw limiting platform cooperates with a claw limiting groove provided on the worm locking disc.

[0010] Further, the inner side of the claw is a conical surface. The claw has a petal-shaped structure. The claw is composed of several identical petals at equal intervals. The cross section of the claw is larger at the top and smaller at the bottom.

[0011] The side surface of the claw fits with the connection part of the coupling.

[0012] Further, an adjustment groove is provided on the upper part of the claw pressing member. A pressing member clamping platform is provided inside the adjustment groove. The pressing member clamping platform is a multi-faceted cylinder.

[0013] A claw adjustment hole is provided at the center of the pressing member clamping platform. The claw adjustment hole penetrates the entire claw pressing member. The lower end surface of the claw pressing member contacts the claw.

[0014] Further, a spiral limiting platform is provided on the side surface of the claw pressing member. The spiral limiting platform cooperates with a pressing member limiting groove provided on the worm locking disc.

[0015] A washer groove is provided at the bottom of the claw pressing member.

[0016] Further, the middle part of the worm locking disc is penetrated. A spiral feed groove and a claw movement chamber are provided from top to bottom in the penetrated part.

[0017] On both sides of the worm locking disc, protruding parts are provided, which are locking disc ears. Locking disc mounting holes are provided on the locking disc ears.

[0018] A pressing member limiting groove is provided between the spiral feed groove and the claw movement chamber of the worm locking disc. A claw limiting groove is provided at the bottom of the claw movement chamber.

[0019] Further, it is characterized in that the torque application component includes a balance plate and weights mounted on the balance plate.

[0020] The gap measurement component includes an instrument fixing table and a micrometer installed on the instrument fixing table.

[0021] Further, counterweight assembly holes are symmetrically provided at both ends of the balance plate, weights are provided on the counterweight assembly holes, and a balance plate mounting hole is provided at the center of the balance plate.

[0022] The position of the balance plate close to the instrument fixing table is connected to the micrometer, and the balance plate is perpendicular to the ejector rod of the micrometer.

[0023] The utility model has the following beneficial effects:

[0024] By rotating the jaw pressing member, the claws of the jaw are driven to engage with the coupling. The tapered inner wall of the claws axially hard limits the coupling, and the worm is connected to the coupling, so as to indirectly realize the axial hard limit of the jaw on the worm. During this period, the jaw does not directly contact the worm and will not damage the worm. And axially limiting the worm, the worm does not have radial displacement, does not affect the accuracy of the measurement result, and the fixation of the worm is simple. When it is necessary to measure the gap of the worm at a different angle, only the jaw pressing member needs to be loosened and the fixing screw of the worm gear is loosened, then the worm can be rotated to change the rotation angle of the worm. During this period, fewer components need to be adjusted, reducing the error during measurement and improving the measurement efficiency. The structure of the fixing component is simple and operates reliably, and can be adapted to different types of worms by replacing the jaw. The weights are used to apply torque to the worm gear after the worm is fixed, and the micrometer can measure the offset occurring in the vertical direction of the balance plate. Through the offset X measured by the micrometer, the gap between the worm gear and the worm is calculated by arctan(X / 100). The micrometer is fixedly installed on the instrument fixing table. After measuring a set of worm gears and worms, the worm gears and worms can be disassembled without disassembling the micrometer, eliminating the measurement error caused by disassembling and assembling the measuring instrument. Description of the Drawings

[0025] Figure 1 It is a schematic cross-sectional view of the locking part of the utility model.

[0026] Figure 2 It is a schematic assembled cross-sectional view of the locking part of the utility model.

[0027] Figure 3 It is a schematic top view of the locking part of the utility model.

[0028] Figure 4 It is a schematic three-dimensional view of the locking part of the utility model.

[0029] Figure 5 It is a schematic overall view of the utility model.

[0030] In the figure, 1 is the jaw pressing part, 11 is the jaw adjustment hole, 12 is the pressing part adjustment groove, 13 is the washer groove, 14 is the spiral limit platform, 15 is the pressing part clamping platform, 2 is the worm locking disc, 21 is the pressing part limit groove, 22 is the jaw limit groove, 23 is the spiral feed groove, 24 is the locking disc mounting hole, 25 is the locking disc ear, 26 is the locking disc mounting platform, 27 is the jaw movement chamber, 28 is the jaw limit surface, 3 is the jaw, 31 is the jaw limit platform, 32 is the jaw adjustment groove, 33 is the claw, 4 is the coupling, 5 is the worm, 6 is the worm and worm gear assembly chamber, 7 is the balance plate, 71 is the counterweight assembly hole, 72 is the balance plate mounting hole, 73 is the weight, 8 is the dial indicator, 81 is the ejector rod, and 9 is the instrument fixing platform. Specific embodiments

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0032] Embodiment:

[0033] As Figures 1-5 shown, a worm and worm gear clearance detection device is composed of four parts: a worm locking part, a worm and worm gear assembly chamber, a torque application component, and a clearance measurement component. A jaw pressing part 1 is threadedly engaged and installed in the spiral feed groove 23 of the worm locking disc 2. Below the threaded feed groove 23 is the jaw movement chamber 27. The jaw 3 is installed inside the worm locking disc 2, and the jaw pressing part 1 is located above the jaw 3 for squeezing the jaw 3 and restricting the movement of the jaw 3.

[0034] The jaw pressing part 1 is the driving component of the worm locking part of the present invention. The jaw pressing part 1 is generally cylindrical, and an external thread is sleeved on its outer side. On the one hand, it can make the feed amount of the jaw pressing part 1 more accurate and better control the feed of the jaw 3. On the other hand, when the jaw pressing part 1 cooperates with the worm locking disc 2, it can play a better fixing role for the jaw 3. When subjected to an axial force, it is not easy for the jaw pressing part 1 to move backward due to the reaction force of the jaw 3, resulting in the inability to effectively fix the jaw 3 and thus unable to fix the worm 5.

[0035] The upper half of the jaw pressing part 1 is the clamping part, which is used to clamp and rotate the jaw pressing part 1 through an instrument, so as to control the feed of the jaw pressing part 1 and realize the fixation and release of the jaw 3. The upper half of the jaw pressing part 1 is provided with a pressing part adjustment groove 12, and a pressing part clamping platform 15 is arranged inside the pressing part adjustment groove 12.

[0036] Since the outer sleeve of the jaw pressing member 1 is threaded, the jaw pressing member 1 cannot be rotated by clamping the outer sleeve during the feeding process. Rotating the jaw pressing member 1 by clamping the outer sleeve will easily damage the external thread structure of the jaw pressing member 1 and make it more prone to wear. Moreover, as the jaw pressing member 1 continuously feeds in the spiral feed groove 23, the exposed part of the jaw pressing member 1 becomes less and less, and the clampable part outside the jaw pressing member 1 becomes smaller and smaller. Therefore, when feeding by clamping the outside of the jaw pressing member 1, the generated force becomes more concentrated, and the damage to the thread is greater. Seriously, it will affect the service stroke and service life of the jaw pressing member 1.

[0037] By machining a pressing member adjustment groove 12 on the upper part of the jaw pressing member 1, the tool can be placed in the pressing member adjustment groove 12 to clamp the pressing member clamping table 15, thereby rotating the jaw pressing member 1 to control the feeding of the jaw pressing member 1 and realizing the fixing and releasing of the jaw 3. Compared with the outer side of the jaw pressing member 1 being circular, the pressing member clamping table 15 is designed to facilitate the clamping of the jaw pressing member 1 by the tool.

[0038] The pressing member clamping table 15 is designed as a regular polygon. In this embodiment, the shape of the periphery of the pressing member clamping table 15 is a regular hexagon. Designing the pressing member clamping table 15 as a regular polygon has its advantages. In the present utility model, the role of the jaw pressing member 1 is very important, and rotating the jaw pressing member 1 is required to adjust the jaw pressing member 1. Therefore, it is necessary for the tool to clamp the jaw pressing member 1. Designing the pressing member clamping table 15 as a polygon is beneficial to improving the clamping stability when the tool clamps the pressing member clamping table 15.

[0039] Comparing the design of the pressing member clamping table 15 as a circle with the design of the pressing member clamping table 15 as a polygon, the circular pressing member clamping table 15 has requirements for the clamping tool. The clamping tool needs to be adapted to the pressing member clamping table 15, and the outside of the pressing member clamping table 15 needs to be provided with an anti-slip design to prevent the jaw pressing member 1 from slipping when rotating with the tool. However, when the pressing member clamping table 15 is designed as a polygon, the structural design requirements for the clamping tool are reduced. The contact between the polygon and the clamping tool is a surface contact. When the pressing member clamping table 15 is clamped, at least two surfaces are in contact with the clamping tool. The more surfaces in contact, the more stable the clamping. Such a clamping method is a surface contact, and the frictional force of the surface contact is greater and more evenly distributed, making it more stable.

[0040] If the clamping piece clamping table 15 is designed to be circular, it is easy to produce line-plane contact between the clamping piece clamping table 15 and general clamping devices, with relatively small friction and prone to slipping. When slipping occurs, if the clamping device is applying a relatively large torque at this time, it is very easy for the clamping device to collide with the jaw clamping piece 1, damaging the jaw clamping piece 1 and also damaging the spiral feed groove 23 for the connection and fixation between the jaw clamping piece 1 and the worm locking disc 2.

[0041] On the contact surface between the jaw clamping piece 1 and the jaw 3, a washer groove 13 is provided on the jaw clamping piece 1. When the jaw 3 and the coupling 4 are assembled, at this time, the jaw clamping piece 1 has not yet contacted the upper end surface of the jaw 3. As the jaw clamping piece 1 feeds in the vertical direction in the spiral feed groove 23 until the jaw clamping piece 1 contacts the jaw 3, at this time, the feeding of the jaw clamping piece 1 not only needs to overcome the friction generated by the thread engagement between the jaw clamping piece 1 and the spiral feed groove 23, but also needs to overcome the friction with the jaw 3. The jaw clamping piece 1 feeds through rotation. Therefore, there is a relatively large sliding friction resistance during the process of the jaw clamping piece 1 fixing the jaw 3.

[0042] Processing a washer groove 13 on the lower end surface of the jaw clamping piece 1 allows a washer to be installed here, which can reduce the friction between the contact surfaces of the jaw clamping piece 1 and the jaw 3, reduce energy loss, and also reduce the heat generation. The washer also acts as an intermediate contact component when the contact surface is uneven, making the contact between the jaw clamping piece 1 and the jaw 3 relatively smooth and flat.

[0043] At the center position of the jaw clamping piece 1, a through hole is designed as the jaw adjustment hole 11. When locking the worm 5, the worm locking disc 2 needs to be fixedly installed on the worm and gear assembly chamber 6. Therefore, when the claw 33 of the jaw 3 contacts the coupling 4, it cannot be guaranteed that the claw 33 can just be inserted into the coupling 4. A jaw adjustment hole 11 is drilled through at the center of the jaw clamping piece 1, and the installation situation of the jaw 3 inside the worm locking disc 2 can be observed through the jaw adjustment hole 11. If it is found that the position of the jaw 3 is offset from the coupling 4, the position of the jaw 3 can also be adjusted through the jaw adjustment hole 11 until the claw 33 of the jaw 3 can be inserted into the coupling 4. Through the jaw adjustment hole 11, on the one hand, the installation state of the claw 33 can be observed, and on the other hand, the position of the claw 3 with a posture problem can be adjusted. It is not necessary to completely screw out the jaw clamping piece 1 from the spiral feed groove 23 when finding that the position of the jaw 3 is offset, then adjust the jaw 3, and then screw in the jaw clamping piece 1 after adjustment, which simplifies the useless operations and improves the production and detection efficiency.

[0044] The worm locking disc 2 is disc-shaped, with a circular center and a through-hole. The circular edge has symmetrically extending square protrusions on both sides, which are locking disc ears 25. In the manufacturing field, the installation of a disc-shaped workpiece requires not only mounting holes on the disc for connection and fixation. Because the mounted part is circular, positioning holes also need to be machined on the disc, and corresponding positioning holes also need to be machined at the corresponding positions of the mounting seat. During installation, a pin is required to position the disc so that the disc workpiece can be installed. Providing locking disc ears 25 on the worm locking disc 2 can not only play a positioning role when installing the worm locking disc 2, but also facilitate the handling and transportation of the worm locking disc 2. The locking disc ears 25 are symmetrically distributed, and the locking disc ears 25 are also symmetrically provided with locking disc mounting holes 24. The locking disc mounting holes 24 can be used to connect and fix the worm locking disc 2 to the worm gear assembly chamber 6 with bolts and nuts.

[0045] A circular annular boss is provided at the upper center of the worm locking disc 2, and a circular annular boss is also provided at the lower center of the worm locking disc 2, serving as a locking disc mounting platform 26. The annular area of the lower locking disc mounting platform 26 is larger than that of the upper one. The height of the upper boss is greater than that of the lower locking disc mounting platform 26. A spiral feed groove 23 and a claw movement chamber 27 are provided from top to bottom on the inner circle of the upper annular boss. There is a diameter difference between the spiral feed groove 23 and the claw movement chamber 27, and this diameter difference forms a clamping member limiting groove 21 at the junction between the spiral feed groove 23 and the claw movement chamber 27. The spiral limiting platform 14 is conical. Because the diameter of the clamping member limiting groove 21 is smaller than the diameter of the spiral limiting platform 14, the spiral limiting platform 14 restricts the claw clamping member 1 from fully entering the claw movement chamber 27.

[0046] A claw limiting surface 28 is provided on the inner circle of the lower locking plate mounting platform 26. The claw limiting surface 28 is connected to the claw movement chamber 27. The diameter of the claw limiting surface 28 is smaller than the diameter of the claw movement chamber 27. A platform is provided between the claw limiting surface 28 and the claw movement chamber 27, which is a claw limiting groove 22, for limiting the movement of the claw 3 in the claw movement chamber 27 and preventing the claw 3 from falling out of the claw movement chamber 27. The outer diameter of the locking plate mounting platform 26 matches the inner diameter of the hole for mounting the worm locking plate 2 in the upper portion of the worm gear assembly chamber 6, so that the worm locking plate 2 can be positioned and fixed at the same time.

[0047] The jaw limiting surface 28 is in contact and cooperation with the claw 33 part of the jaw 3. The diameter of the claw 33 is the same as the inner diameter of the jaw limiting surface 28. The jaw limiting surface 28 is used to limit the movement track of the claw 33 and control the movement path of the claw 33 to be only parallel to the surface of the jaw limiting surface 28. Ensure that when the jaw 3 is connected to the coupling, the force transmitted by the jaw 3 from the jaw pressing part 1 is only the axial force, eliminating the influence of the radial force on the clearance measurement of the worm and worm gear. Ensure the accuracy of the dial indicator 8 in measuring the clearance between the worm and worm gear.

[0048] The jaw 3 is in the shape of a stepped shaft, with the bottom designed as the claw 33. The inner end surface of the claw 33 is a conical surface. The claw 33 is in a petal-shaped structure and is equally spaced at the edge of the jaw 3. The claw 33 is composed of four identical petals at equal intervals. The arc length and the area of the fan surface of the upper part of each petal of the claw 33 are larger than the arc length and its fan surface area of the bottom. The projection surface of each petal of the claw 33 is trapezoidal, similar to a frustum of a pyramid, but its upper and lower end surfaces are fan-shaped. The cross-section of the claw 33 is larger at the top and smaller at the bottom, and the side surface of the claw 33 fits with the connection part of the coupling 4.

[0049] The upper part of the jaw 3 is cylindrical, and its diameter is larger than that of the lower cylindrical part. The upper part of the jaw 3 is the jaw limiting platform 31, which is used to limit the movement of the jaw 3 in the jaw movement chamber 27. The diameter of the jaw limiting platform 31 is smaller than the inner diameter of the jaw movement chamber 27, but the diameter of the jaw limiting platform 31 is larger than the inner diameter of the jaw limiting surface 28. The lower end surface of the jaw limiting platform 31 of the jaw 3 is restricted by the jaw limiting groove 22. The height below the jaw limiting platform of the jaw 3 is greater than the sum of the heights of the upper and lower circular rings of the worm locking disc. A groove, namely the jaw adjustment groove 32, is provided on the upper end surface of the jaw limiting platform 31 of the jaw 3. The jaw adjustment groove 32 can be adjusted through the jaw adjustment hole 11, so as to adjust the connection between the claw 33 of the jaw 3 and the coupling 4 and ensure that the claw 33 can better hold the coupling 4.

[0050] The torque application component of the worm and worm gear clearance detection device includes a balance plate 7 and a weight 73 mounted on the balance plate 7. The clearance measurement component is connected to the torque application component to measure the clearance. The torque application component is connected to the worm to apply torque to the worm. The clearance measurement component includes an instrument fixing table 9 and a dial indicator 8 mounted on the instrument fixing table 9. Weight assembly holes 71 for adding counterweights are symmetrically provided at both ends of the balance plate 7. The weight assembly holes 71 are blind holes, and weights 73 are placed on the weight assembly holes 71. A balance plate mounting hole 72 for connecting and fixing with the worm is also provided at the center of the balance plate 7.

[0051] On the platform of the worm and worm gear clearance detection device, there is an instrument fixing table 9. A dial indicator 8 is fixedly installed on the instrument fixing table 9, and the dial indicator 8 is used to measure the clearance between the worm and the worm gear. One side of the balance plate 7 close to the instrument fixing table 9 is connected to the dial indicator 8. When the balance plate 7 is connected to the dial indicator 8, the balance plate 7 is perpendicular to the ejector rod 81 of the dial indicator 8. The balance plate 7 remains horizontal when measuring the clearance between the worm and the worm gear, while the part of the worm and worm gear assembly chamber 6 for placing the worm 5 is vertically placed. In the leveling state before starting the measurement, the end face of the ejector rod 82 of the dial indicator 8 contacts the lower end face of the balance plate 7, and the two are parallel. The center distance from the weight assembly hole 71 to the balance plate mounting hole 71 is 0.1 meter, and the mass of the weight 73 can be selected according to requirements. At the start of the measurement, the dial indicator 8 is fixedly installed on the instrument fixing table 9 and will not be disassembled or assembled again after adjustment. This reduces the error during the measurement caused by disassembling and assembling the measuring instrument.

[0052] At the beginning of the measurement process, first, the end of the worm 5 with the coupling 4 installed is placed vertically upward and placed in the area of the worm and worm gear assembly chamber 6 for placing the worm. Rotate the jaw pressing part of the clamping pressing part 15 of the tool to release the jaw pressing part 1 on the worm locking disc 2, leaving sufficient movement margin between the jaw pressing part 1 and the jaw 3. Then, place the worm locking disc 2 on the part of the worm and worm gear assembly chamber 6 for installing the worm locking disc 2. After positioning and fitting, connect and fix the worm locking disc 2 to the worm and worm gear assembly chamber 6 by installing bolts and nuts on the locking disc mounting hole 24.

[0053] After the worm locking disc 2 is fixedly installed, first pass through the jaw adjustment hole 11 of the jaw pressing part 1, and use a tool to rotate the whole jaw 3 through the jaw adjustment groove 32 to adjust the claw 33 of the jaw 3 to insert into the coupling 4. The following method can be used to judge whether the claw 33 is well stuck in the coupling 4. Through the tool adjusting the jaw adjustment groove 32, press down the jaw 3. If the jaw 3 does not slide down and there is no rebound after release, it means that the jaw 3 is not stuck in the coupling 4. If the jaw 3 makes some displacement downward and then gets stuck and there is a rebound phenomenon after release, it means that the jaw 3 is stuck in the coupling 4. It is also possible to use a tool to apply a downward force while rotating the jaw 3 through the jaw adjustment groove 32. If the jaw 3 slides down during the rotation and cannot rotate anymore when it slides to the bottom, it means that the jaw 3 is installed.

[0054] After the jaw 3 is installed, the fixing process of the worm 5 can be started. Clamp the pressing piece clamping table 15 of the jaw pressing piece 1 with an appliance, and rotate the jaw pressing piece 1 to make the jaw pressing piece 1 feed downward. When the jaw pressing piece 1 touches the upper end face of the jaw 3, it can be felt that the resistance of rotating the jaw pressing piece 1 suddenly changes, that is, the frictional resistance suddenly increases. At this time, the jaw pressing piece 1 starts to contact the jaw 3. Continue to rotate the jaw pressing piece 1. As the jaw 3 is continuously pressed downward, at this time, the reaction force of the jaw 3 on the jaw pressing piece becomes larger and larger, and the gap between the jaw 3 and the coupling 4 also becomes smaller and smaller. Until the jaw 3 is in close contact with the coupling 4, that is, when the inner diameter of the claw 33 of the jaw 3 is the same as the diameter of the coupling 4, the jaw pressing piece 1 can no longer feed downward. At this time, the worm is completely fixed and cannot rotate or perform other movements.

[0055] The balance plate 7 is connected and fixed to the rotating shaft of the worm gear inside the worm gear assembly chamber through the balance plate mounting hole 72, and the balance plate 7 is ensured to be in a horizontal state by a measuring instrument at this time. The dial indicator 8 is installed on the instrument fixing table 9 at the beginning of the measurement. The end face of the ejector rod 81 of the dial indicator 8 is exactly fitted to the balance plate 7 without destroying the horizontal state of the balance plate 7. At this time, no weights are placed in the two weight mounting holes 71 of the balance plate 7. After zeroing the reading on the dial indicator 8, the measurement of the worm gear clearance can be started.

[0056] In this embodiment, the mass of the weight 73 is selected as 1 kilogram. When measuring the clearance between the worm and the worm gear, first, the worm and the worm gear need to be fixed in cooperation. After the cooperation and fixation, place a 1-kilogram weight 73 on the weight mounting hole 71 of the balance plate 7 far from the dial indicator 8. Since the distance between the weight mounting hole 71 and the balance plate mounting hole 72, the rotation center of the balance plate 7, is 〇.1 meter, an equivalent torque of 1 N·m is applied to the worm gear.

[0057] After waiting for the device to stabilize, zero the reading on the dial indicator 8 at this time, remove the weight 73, place it in the weight mounting hole 71 at the other end of the balance plate 7, and record the reading X of the dial indicator 8 at this time. Convert the displacement into an angle through the calculation formula arctan(X / 100). This angle is the clearance between the worm and the worm gear when a torque of ±1 N·m is applied to the worm gear. After completing this step of operation, remove the weight 73, zero the dial indicator 8, repeat the above measurement steps, and weights can also be replaced for measurement to obtain multiple sets of data, thereby reducing the measurement error.

[0058] This worm and worm gear clearance detection device fixes the worm 5 axially through the locking mechanism, and at the same time does not apply radial force to the worm 5, reducing the interference of unnecessary factors on the measurement result and improving the measurement accuracy. The torque applied to the worm gear is achieved by the weight 73, and the weight of the weight 73 is optional, ensuring that the applied torque is quantified and determined, improving the reliability of the clearance measurement between the worm and worm gear. Finally, the dial indicator 8 is fixed on the instrument fixing table 9, eliminating the error generated during the disassembly and assembly of the measuring instrument and further improving the measurement accuracy.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A worm and worm gear clearance detection device, comprising a worm (5), a worm gear and a worm and worm gear assembly chamber (6), characterized in that, The jaw pressing member (1) is connected to the worm locking disc (2). A jaw (3) is penetrated through the worm locking disc (2), and the jaw (3) is inserted on the coupling (4). The worm gear is connected to a torque application assembly, and the torque application assembly is connected to a clearance measurement assembly.

2. The worm and worm gear clearance detection device according to claim 1, wherein, The main body part of the jaw (3) is in surface contact with the jaw limiting surface (28) provided on the worm locking disc (2). Claws (33) are provided at the lower part of the main body part of the jaw (3). The claws (33) are inserted on the coupling (4), and the coupling (4) is installed on the worm (5).

3. A worm and worm gear clearance detection device according to claim 1, characterized in that, A jaw adjustment groove (32) is provided on the upper end surface of the jaw (3). A jaw limiting platform (31) extends outward from the upper end surface of the jaw (3), and the jaw limiting platform (31) cooperates with the jaw limiting groove (22) provided on the worm locking disc (2).

4. A worm and worm gear clearance detection device according to claim 2, characterized in that, The inner side of the claw (33) is a conical surface. The claw (33) has a petal-like structure. The claw (33) is composed of several identical petals at equal intervals, and the cross section of the claw (33) is larger at the top and smaller at the bottom. The side surface of the claw (33) is attached to the connection part of the coupling (4).

5. A worm and worm gear clearance detection device according to any one of claims 1 to 4, characterized in that, An adjustment groove (12) of the pressing member is provided at the upper part of the jaw pressing member (1). A clamping platform (15) of the pressing member is provided inside the adjustment groove (12) of the pressing member. The clamping platform (15) of the pressing member is a multi-sided column. A jaw adjustment hole (11) is provided at the center of the clamping platform (15) of the pressing member. The jaw adjustment hole (11) penetrates through the entire jaw pressing member (1), and the lower end surface of the jaw pressing member (1) contacts the jaw (3).

6. A worm and worm gear clearance detection device according to any one of claims 1 to 4, characterized in that A spiral limiting platform (14) is provided on the side surface of the jaw pressing member (1), and the spiral limiting platform (14) cooperates with the pressing member limiting groove (21) provided on the worm locking disc (2). A washer groove (13) is provided at the bottom of the jaw pressing member (1).

7. A worm and worm gear clearance detection device according to any one of claims 1 to 4, characterized in that The middle part of the worm locking disc (2) is penetrated. A spiral feed groove (23) and a jaw movement chamber (27) are provided from top to bottom in the penetrated part. On both sides of the worm locking disc (2), there are protruding parts, which are locking disc ears (25). Locking disc mounting holes (24) are provided on the locking disc ears (25). A pressing member limiting groove (21) is provided between the spiral feed groove (23) and the jaw movement chamber (27) of the worm locking disc (2). A jaw limiting groove (22) is provided at the bottom of the jaw movement chamber (27).

8. A worm and worm gear clearance detection device according to any one of claims 1 to 4, characterized in that, The torque application assembly includes a balance plate (7) and weights (73) installed on the balance plate (7). The clearance measurement assembly includes an instrument fixing table (9) and a micrometer (8) installed on the instrument fixing table (9).

9. The worm and worm gear clearance detection device according to claim 8, characterized in that, Counterweight assembly holes (71) are symmetrically provided at both ends of the balance plate (7). Weights (73) are provided on the counterweight assembly holes (71). A balance plate mounting hole (72) is provided at the center of the balance plate (7). The balance plate (7) is connected to the micrometer (8) at a position close to the instrument fixing table (9), and the balance plate (7) is perpendicular to the ejector rod (81) of the micrometer (8).

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