Worm and gear mechanism, worm gear manufacturing method and gap eliminating method and device

Abstract

The invention relates to the technical field of transmission mechanisms, and provides a worm and gear mechanism, a worm gear manufacturing method and a gap eliminating method and device.The worm and gear mechanism comprises the following steps that a worm gear is clamped and rotated through a clamping device; measuring and recording the axial displacement of the worm in the rotation process of the worm gear through a measuring device; selecting an anti-backlash gasket corresponding to the axial displacement size; and the anti-backlash gasket is assembled in the gap at the axial end part of the worm. According to the scheme, the clearance is reduced by adding the clearance eliminating gasket at the end of the worm, so that the overall shaking amount is reduced, meanwhile, the specification of the clearance eliminating gasket which is automatically selected through equipment detection is added, manual comparison is not needed, manual operation steps are reduced, and meanwhile it is guaranteed that the specification of the clearance eliminating gasket conforms to the clearance of the end of the worm.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission mechanisms, and particularly relates to a worm and worm gear mechanism, a method for manufacturing a worm gear, a method for eliminating clearance, and a device therefor. Background Art

[0002] In-vehicle cockpits are increasingly using motion screens in forms such as yawing, rotating, and sliding to create a more intelligent cockpit interaction and user experience; the screen motion mechanism not only needs to achieve smooth electric operation but also maintain its stability in the static state. Therefore, a worm and worm gear mechanism is usually used to transmit motion and power between two intersecting shafts. The worm gear and the worm are equivalent to a gear and a rack in their intermediate plane, and the worm is also similar in shape to a screw.

[0003] When installing a worm and worm gear structure, an axial clearance of the transmission structure needs to be reserved to ensure the feasibility of installation. This installation clearance is generally located at both ends of the worm. In this way, when the in-vehicle screen shakes left and right, it may cause a relatively loud collision sound, resulting in a poor user experience. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a worm and worm gear mechanism, a method for manufacturing a worm gear, a method for eliminating clearance, and a device therefor, so as to reduce the clearance size at both ends of the worm.

[0005] To achieve the above object and other related objects, the present invention provides a worm and worm gear mechanism, including:

[0006] A base, provided with an installation cavity;

[0007] A worm gear, disposed in the installation cavity;

[0008] A worm, disposed in the installation cavity and meshing with the worm gear;

[0009] A clearance-eliminating gasket, disposed on the axial end of the worm to fill the clearance between the worm and the base.

[0010] In a specific embodiment of the present invention, bearings are provided at both ends of the worm, and a card slot for accommodating the bearings is provided on the base.

[0011] In a specific embodiment of the present invention, the worm includes an inner shaft and an outer shaft fixedly disposed coaxially. The two ends of the outer shaft abut against the end faces of the bearings, and the inner shaft passes through the bearings.

[0012] In a specific embodiment of the present invention, the clearance-eliminating gasket is disposed between the end face of the inner shaft and the wall of the card slot.

[0013] The present invention also provides a method for manufacturing a worm gear for the worm and worm gear mechanism as described above, including the following steps:

[0014] Fill the nylon injection material into the mold and injection-mold it into a rough worm wheel blank with a toothed embryo.

[0015] Machine-process the toothed embryo of the rough worm wheel blank to form the finished product of the worm wheel 20.

[0016] In a specific embodiment of the present invention, before the step of machining the toothed embryo of the rough worm wheel blank to form the finished product of the worm wheel 20, soak the rough worm wheel blank in water.

[0017] In a specific embodiment of the present invention, the contour of the toothed embryo of the rough worm wheel blank covers the tooth profile of the finished product of the worm wheel 20.

[0018] The present invention also provides a clearance elimination method, including the following steps:

[0019] Clamp and rotate the worm wheel through a clamping device;

[0020] Measure and record the axial displacement of the worm during the rotation of the worm wheel through a measuring device;

[0021] Select a backlash compensation shim corresponding to the size of the axial displacement;

[0022] Assemble the backlash compensation shim into the axial end clearance of the worm.

[0023] In a specific embodiment of the present invention, in the step of selecting a backlash compensation shim corresponding to the size of the axial displacement, it includes:

[0024] When the axial displacement is less than a preset threshold, issue a prompt indicating that there is no need to eliminate the clearance and directly enter the next process;

[0025] When the axial displacement is greater than the preset threshold, select a backlash compensation shim corresponding to the size of the axial displacement.

[0026] In a specific embodiment of the present invention, in the step of selecting a backlash compensation shim corresponding to the size of the axial displacement, it includes:

[0027] Obtain a clearance value by truncating the axial displacement;

[0028] Select a backlash compensation shim with the same thickness as the clearance value as the shim to be assembled.

[0029] In a specific embodiment of the present invention, the thickness specifications of the backlash compensation shims are arranged in an arithmetic gradient.

[0030] The present invention also provides a clearance elimination device, including:

[0031] A mechanical clamping arm for clamping and rotating the worm wheel;

[0032] A probe is arranged along the axial direction of the worm, and the head of the probe abuts against the radial surface of the worm wheel to measure the axial displacement of the worm during the rotation of the worm wheel.

[0033] A display is used to display the clearance value according to the axial displacement.

[0034] A shim box is used to eject or expose shims of corresponding sizes according to the axial displacement.

[0035] The present invention provides a worm and worm wheel mechanism, a method for manufacturing a worm wheel, a method for eliminating clearance and a device. In the above solution, shims are added at the end of the worm to reduce the clearance, thereby reducing the overall wobble. At the same time, the specification of the shim for automatic selection by the device detection is added, so that manual comparison is not required, reducing the manual operation steps, and at the same time ensuring that the specification of the shim meets the clearance at the end of the worm. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 It is a schematic structural diagram of a worm and worm wheel mechanism in an embodiment of the present invention;

[0038] Figure 2 It is Figure 1 The partial enlarged view of A of

[0039] Figure 3 It is a flowchart of a method for eliminating clearance in an embodiment of the present invention;

[0040] Figure 4 It is a flowchart of selecting a shim for clearance elimination in an embodiment of the present invention.

[0041] Figure 5 It is a schematic structural diagram of a worm wheel in an embodiment of the present invention;

[0042] Figure 6 It is a flowchart of a method for manufacturing a worm wheel in an embodiment of the present invention.

[0043] Description of the reference numerals: 10, base; 11, card slot; 20, worm wheel; 21, disc body; 22, sector protrusion; 23, helical tooth; 30, worm; 40, shim; 50, bearing. Detailed Embodiments

[0044] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the layout type of the components may also be more complex.

[0046] Motion screens in the automotive cockpit, such as yawing, rotating, and sliding, are increasingly used to create a more intelligent cockpit interaction and user experience. The screen motion mechanism not only needs to achieve the smoothness of electric operation but also maintain its stability in the static state. Therefore, a worm and worm gear structure is usually adopted to achieve transmission, which is usually used to achieve smooth and reliable rotation and adjustment movements. This structure mainly includes two main parts, a worm gear 20 and a worm 30.

[0047] The worm gear 20 is similar to a gear, and its teeth are nested with the helical teeth of the worm 30. The worm gear 20 is usually a disk with a large diameter, and its edge is distributed with tooth grooves along the helix of the worm 30. The main function of the worm gear 20 is to transmit the rotational motion of the worm 30 and convert it into the rotational motion of the worm gear 20 itself. Due to the special design of the helix, the worm gear 20 can provide a large reduction ratio, thus achieving a more precise position adjustment.

[0048] The worm 30 is a helical rod, and its shape is similar to a bolt. One end of the worm 30 is connected to a driving device. By rotating the worm 30, the worm gear 20 can be driven to rotate. Due to the characteristics of the helix, even without other supports, the worm 30 can prevent the worm gear 20 from rotating in the reverse direction, providing a mechanical locking effect. The advantages of the worm and worm gear structure lie in its compact design, large reduction ratio, and relatively high transmission efficiency. This structure is commonly used in applications that require precise control and locking of positions, such as the in-vehicle center console screen bracket. The worm and worm gear structure can also provide good mechanical transmission stability because the helix of the worm 30 will prevent the reverse movement transmitted from the worm gear 20.

[0049] For the worm and worm gear structure inside the in-vehicle center console screen, high strength and high precision are required. The ultimate tolerance of the cross-ball diameter of the tooth profile of the final product size is less than 0.1 mm (for example, the required cross-ball diameter is 50.4 +0.08 / +0.01 mm), and the total tooth surface runout is less than 0.08 mm. It usually adopts a special-shaped worm structure as shown in Figure 5 The special-shaped worm structure has a disc body 21, a fan-shaped protrusion 22 is provided on the outer periphery of the disc body 21, and helical teeth 23 are arranged on the arc surface of the fan-shaped protrusion 22.

[0050] In the prior art, the manufacturing method for this special-shaped worm is as follows: First, nylon material is injected into a mold for injection molding to form a blank part with a disc body 21 and a fan-shaped protrusion 22. Due to cost control of the injection mold, the arc surface of the fan-shaped protrusion 22 of the blank part is a smooth surface. Then, there are two ways to process the tooth profile. The first solution is to remove the waste material between the teeth by milling, and then extrude the space between the teeth through a cold extrusion process to obtain the tooth profile. The second solution is to directly extrude the arc surface of the fan-shaped protrusion 22 through a cold extrusion process to obtain the tooth profile.

[0051] In the first solution, secondary processing is required, which increases the processing procedures. At the same time, it is necessary to process each tooth in sequence. For the special-shaped worm, its positions are uneven, and there will be certain differences in the positioning reference positions of each tooth. In this way, it is very difficult to accurately process during milling. At the same time, some tooth profiles themselves have complex curved surfaces, and it is very difficult to process them by milling. If the milling processing accuracy is too low, due to the certain elasticity of the nylon material itself during cold extrusion, the rough blank parts with too low accuracy are likely to have local overthickness and cause large springback, and the large springback amount will affect the final product accuracy.

[0052] In the second solution, only one processing is required. However, there is more remaining material between the teeth, so large springback will also occur during cold pressing, which will inevitably affect the final product accuracy. At the same time, due to more remaining material between the teeth, a larger extrusion force is necessarily required. For the special-shaped worm, only a part of the fan-shaped protrusion 22 needs to be processed with tooth profiles. In this way, the pressing force on it is uneven during cold extrusion. If the extrusion force is too large, it is very likely to cause plastic deformation in other parts of the worm, affecting the final product accuracy.

[0053] As shown in Figure 1 、 2 The present invention provides a worm and worm gear mechanism, including a base 10, a worm 20, a worm gear 30, and a backlash adjusting shim 40.

[0054] The base 10 is provided with an installation cavity. The base 10 is the support structure of the entire mechanism, providing a platform for installing and supporting other components of the mechanism. There may be an installation cavity on the base 10 for installing other components of the worm and worm gear mechanism. The installation cavity is a cavity or groove on the base 10 for installing other components of the mechanism, such as the worm wheel 20, the worm 30, and the backlash compensation shim 40. The design and size of the installation cavity should match the requirements and specifications of the mechanism.

[0055] The worm wheel 20 is arranged in the installation cavity. The worm wheel 20 is a key component in the worm and worm gear mechanism, usually in a disc-like structure with spiral teeth. The worm wheel 20 transmits motion through the rotation of the worm 30 and converts the rotational motion into linear or rotational motion.

[0056] The worm 30 is arranged in the installation cavity and meshes with the worm wheel 20. The worm 30 is another key component in the worm and worm gear mechanism, usually a long and spiral-shaped rod. The rotation of the worm 30 drives the rotational motion of the worm wheel 20, playing a role in transmitting motion.

[0057] The form between the worm wheel 20 and the worm 30 is gear meshing, and there is a meshing clearance. At the same time, when the worm 30 is installed in the installation cavity, an assembly clearance needs to be reserved axially, so there is also a certain clearance between the worm 30 and the base 10; the meshing clearance cannot be further eliminated under the condition of ensuring the manufacturing accuracy of the product. The meshing clearance and the clearance between the worm 30 and the installation cavity will be superimposed, plus the cumulative tolerance, and the clearance at both ends of the worm 30 will be relatively large after assembly.

[0058] The backlash compensation shim 40 is arranged on the axial end of the worm 30 to fill the clearance between the worm 30 and the base 10. In a mechanical transmission system, the clearance may cause instability of motion and reduced accuracy. The backlash compensation shim 40 is arranged on the axial end of the worm 30, which means it is located at the end of the worm 30. This position selection is to fill the potential clearance in the key area between the worm 30 and the base 10, thereby reducing or eliminating the instability and accuracy problems in the worm and worm gear mechanism.

[0059] Such as Figure 1 、 2As shown, bearings 50 are provided at both ends of the worm 30, and a clamping groove 11 for accommodating the bearings 50 is formed on the base 10. The provision of bearings 50 at both ends of the worm 30 means that the bearings 50 are respectively installed at the two ends of the worm 30. The function of the bearings 50 in the mechanical system is to support and reduce friction, thereby making the rotation of the worm 30 smoother. This helps to improve the efficiency and durability of the entire worm and worm gear mechanism. The formation of the clamping groove 11 on the base 10 for accommodating the bearings 50 indicates that the design of the base 10 allows the bearings 50 to be installed thereon, and the shape and size of the clamping groove 11 match those of the bearings 50. The function of the clamping groove 11 is to fix the bearings 50, provide support, and ensure their stability and reliability during use.

[0060] By providing bearings 50 at both ends of the worm 30, the load can be more evenly distributed, reducing the load on a single bearing 50, which helps to improve the stability and lifespan of the overall system. If it is necessary to replace or maintain the bearings 50, the design of the clamping groove 11 on the base 10 may make this process more convenient. The bearings 50 can be relatively easily installed or removed for maintenance.

[0061] As Figure 1 、 2 shown, the worm 30 includes an inner shaft and an outer shaft that are coaxially and fixedly arranged. The two ends of the outer shaft abut against the end faces of the bearings 50, and the inner shaft passes through the bearings 50. The worm 30 includes two coaxially and fixedly arranged parts, an inner shaft and an outer shaft. That is, the worm 30 has an overall stepped shaft structure, and spiral teeth are provided on the outer peripheral wall of the outer shaft, while the inner shaft is used for support and fixation. The two ends of the outer shaft abut against the end faces of the bearings 50. This design allows the outer shaft to be in direct contact with the bearings 50 and provides support and fixation through the bearings 50. This arrangement helps to maintain the stable rotation of the worm 30. The inner shaft passes through the holes or central holes of the bearings 50. This design may be to ensure that the inner shaft can rotate freely and obtain the required support through the bearings 50.

[0062] As Figure 1 、 2 shown, the backlash shim 40 is disposed between the end face of the inner shaft and the wall of the clamping groove 11. That is, the backlash shim 40 also fills the space between the bearings 50 and the wall of the clamping groove 11. During assembly, assembly tolerances may also occur for the bearings 50, and in this case, the gap between the bearings 50 and the wall of the clamping groove 11 will also cause axial movement of the worm 30. In this situation, in addition to filling the gap between the end face of the inner shaft and the wall of the clamping groove 11, the backlash shim 40 can also fill the gap between the bearings 50 and the wall of the clamping groove 11. The selection and use of the backlash shim 40 can help to adjust these gaps, thereby reducing or eliminating axial movement.

[0063] As Figure 6 shown, the present invention provides a method for manufacturing a worm gear, including the following steps:

[0064] S1. Fill nylon injection material into the mold and injection mold it into a rough worm wheel blank with a toothed blank.

[0065] Injection molding can be used to produce various complex-shaped parts, including the rough blank of the worm wheel 20 and the tooth shape thereon. According to the design requirements of the worm wheel 20, formulate the corresponding injection mold design. The mold should include the shape of the toothed blank of the worm wheel 20 and consider factors such as material flow and cooling. Select an appropriate injection material suitable for the manufacture of the worm wheel 20. Then heat the injection material to an appropriate temperature to ensure that it can flow evenly and fill the mold during the injection process. Fill the heated plastic into the mold. The injection molding machine pushes the molten plastic into all parts of the mold through high pressure to ensure the formation of the accurate shape of the worm wheel 20. The parts formed in the mold require a certain pressure and cooling time. The pressure ensures that the material fully fills the mold, and the cooling ensures that the material solidifies in the mold. Once the plastic solidifies, open the mold and take out the rough worm wheel blank.

[0066] Engineering plastics are usually used, such as nylon, polyamide (PA), polypropylene (PP), etc. The injection material is preferably PA66+GF20. PA66+GF20 is an engineering material, which is composed of a base resin (polyamide 66) mixed with 20% glass fiber (GF) reinforcing agent. The PA66 base resin itself has relatively high strength and rigidity. After adding 20% glass fiber reinforcing agent, its strength and rigidity are further improved. This makes PA66+GF20 have relatively high flexural and tensile strength and is suitable for applications requiring high strength and rigidity. PA66+GF20 has good heat resistance and temperature resistance and can maintain good performance stability in high-temperature environments. It can usually withstand temperatures up to about 200°C. PA66+GF20 has good wear resistance and has the characteristics of anti-wear and abrasion resistance. Due to the addition of the glass fiber reinforcing agent, PA66+GF20 has a low linear thermal expansion coefficient, making the parts made maintain relatively stable dimensions when the temperature changes. PA66+GF20 also has good electrical insulation performance.

[0067] In a specific embodiment of the present invention, the toothed blank contour of the rough worm wheel blank covers the tooth shape contour of the finished product of the worm wheel 20. This can ensure that the design requirements can be met in the final processing and finishing stages. During the manufacturing process of the worm wheel 20, the toothed contour of the rough worm wheel blank is slightly larger than the final required size, so that the subsequent processing can remove the excess material and make the worm wheel 20 finally reach the precise size and tooth shape required by the design. This design allows the worm wheel 20 to be trimmed and finished in subsequent processing steps to achieve the precise tooth shape contour and size.

[0068] In a specific embodiment of the present invention, the dimensional allowance of the tooth profile blank of the worm gear rough blank relative to the tooth profile of the finished worm gear 20 is 0.5 mm. This dimensional allowance is to accommodate subsequent processing steps to ensure accurate dimensions and tooth profiles in the final product. In this application, subsequent processing is preferably carried out by cold extrusion. If the allowance is too large, it will cause excessive final extrusion pressure, resulting in plastic deformation of the worm gear 20 and affecting the accuracy. If the allowance is too small, it may cause depressions in the final product due to local material negative errors. Therefore, the dimensional allowance of the tooth profile is set to 0.5 mm.

[0069] Since the tooth profile blank is directly formed during injection molding in this application, the tooth profile blank thus has a high positional accuracy. It only needs to ensure the dimensional accuracy of a single tooth profile during subsequent processing, which can further ensure the accuracy of the finished worm gear 20.

[0070] S2. Soak the worm gear rough blank.

[0071] The soaking time is 72 hours. Nylon is a hygroscopic material that can absorb moisture from the surroundings. Soaking can help reduce the hygroscopicity of the nylon material and improve its dimensional stability. At the same time, if some treatment agents or additives are used in the manufacturing process of the worm gear rough blank, soaking can also help remove these residues, making the final product purer.

[0072] By allowing nylon to absorb water before processing, the nylon will undergo some deformation after absorbing water. By performing the water absorption treatment before processing, this deformation can be dealt with at this stage, avoiding problems caused after finish machining. It can, to a certain extent, avoid deformation problems caused by water absorption after processing is completed, thereby improving the accuracy and dimensional stability of the finished product. Water absorption can also change the mechanical properties and processing properties of nylon, making it easier to process without causing unexpected deformation or cracks.

[0073] S3. Machine the tooth profile blank of the worm gear rough blank to form the finished worm gear 20.

[0074] The machining process is a cold extrusion process or a milling process, preferably a cold extrusion process.

[0075] The cold extrusion process is often used in the processing of plastic deformation materials (such as metals) when manufacturing parts such as the worm wheel 20. Compared with the milling process, the cold extrusion process can usually provide higher production efficiency and material utilization rate, and can improve the strength and wear resistance of materials to a certain extent. Cold extrusion can plastically deform the material into the required shape. Compared with the milling process that removes materials by cutting, it can utilize raw materials more efficiently and reduce waste generation. Cold extrusion can increase the density and uniformity of materials, thereby improving the strength, hardness and wear resistance of parts such as the worm wheel 20. The cold extrusion process can provide good dimensional control and surface quality to a certain extent, although subsequent heat treatment or processing may be required to meet the final precision requirements.

[0076] S4. Inspect the finished product of the worm wheel 20.

[0077] Inspecting the finished product of the worm wheel 20 is a key step to ensure that the product quality and performance meet the design and specification requirements. Use appropriate measuring tools, such as calipers, projectors, etc., to measure the key dimensions of the worm wheel 20. Ensure that the dimensions meet the design specifications, especially the dimensions and geometries of the tooth profiles.

[0078] The quality inspection steps may include:

[0079] The hardness of the worm wheel 20 is crucial for its wear resistance and strength. Through hardness testing, it can be ensured that the hardness of the worm wheel 20 is within the design requirements.

[0080] Check the surface quality of the worm wheel 20, including whether there are obvious wear, scratches or other defects. An optical microscope or a surface quality testing instrument can be used for a detailed inspection of the surface.

[0081] The worm wheel 20 is part of the meshing with other worm gears. Ensure that the meshing between the worm wheel and the worm gear meets the requirements, without obvious gaps or poor meshing.

[0082] Conduct a durability test on the worm wheel 20 to simulate the performance under actual use conditions. This may include fatigue tests, axial load tests, etc., to ensure the reliability of the worm wheel 20 during long-term use.

[0083] As Figure 3 shown, the present invention also provides a method for eliminating gaps, including the following steps.

[0084] S1. Clamp and rotate the worm wheel 20 through a clamping device. Due to the inherent self-locking property of the worm gear mechanism, when the worm wheel 20 is rotated, the power will not be converted into the rotation of the worm 30, but will be converted into the axial movement of the worm 30, and the displacement amount of the axial movement is the gap value at both ends of the worm 30.

[0085] S2. Measure the axial displacement of the worm 30 during the rotation of the worm gear 20 with a measuring device and record it.

[0086] Special displacement sensors, such as linear displacement sensors, can be used to directly measure the axial displacement of the worm 30. These sensors can usually provide high-precision and real-time displacement data. The sensors can be installed at both ends of the worm 30 or at other suitable positions to accurately monitor the axial displacement.

[0087] Laser displacement measurement equipment can also be used to non-contact measure the axial displacement of the worm 30. By using a laser sensor, the displacement of the surface of the worm 30 can be recorded in real time.

[0088] An axial encoder can also be used. An encoder can be placed on the worm 30 to measure the axial displacement. This method can usually provide a higher resolution and accuracy and is suitable for situations where high-precision displacement measurement is required.

[0089] For the measurement of micro displacements, a micro displacement measuring instrument, such as a differential transformer or a capacitive sensor, can be considered.

[0090] S3. Select a backlash compensation shim 40 corresponding to the size of the axial displacement. This step is completed by machine equipment, avoiding the time-consuming and laborious manual comparison one by one, and also avoiding the situation where workers directly use a smaller backlash compensation shim 40 to insert into the gap in order to improve the assembly speed and then directly enter the next process, resulting in the gap not being eliminated to a reasonable range. Automatic measurement systems can be used. These systems can accurately measure the axial displacement through sensors or vision systems. In this way, you can obtain real-time displacement data without manual intervention. These data can be directly used to select the appropriate backlash compensation shim 40.

[0091] Among them, as Figure 4 shown, step S3 includes:

[0092] S31. Obtain the gap value by truncating the axial displacement value. Since the backlash compensation shim 40 is generally selected as a hard material, to avoid the selected backlash compensation shim 40 being unable to be inserted into the gap, the truncation method is used to obtain the gap value to ensure that the gap value is slightly larger than the backlash compensation shim. The truncation method in this application refers to removing the numerical value after the conventional size of the backlash compensation shim 40. For example, when the gap size is 0.15 mm and the backlash compensation shims 40 are 0.1 mm and 0.2 mm, select the 0.1 mm backlash compensation shim 40, that is, downward compatible with the corresponding backlash compensation shim 40 according to the gap size.

[0093] S32. Select a backlash compensation shim 40 with a thickness equal to the gap value as the backlash compensation shim 40 to be assembled. Directly select a backlash compensation shim 40 with a thickness equal to the measured gap value. This ensures that the thickness of the shim exactly matches the gap value.

[0094] When the axial displacement is less than the preset threshold value, a prompt indicating that there is no need to eliminate the gap is issued, and the process directly proceeds to the next step. In this application, the preset threshold value is 0.1 mm. When the system conducts detection, there may be a situation where the inherent gap is relatively small. In this case, there is no need to fill the gap-eliminating gasket 40, and the process can directly proceed to the next step.

[0095] When the axial displacement is greater than the preset threshold value, a gap-eliminating gasket 40 corresponding to the size of the axial displacement is selected. When the axial displacement exceeds the preset threshold value, a gap-eliminating gasket 40 that matches the measured axial displacement size is selected according to the measured value. This requires an automated system to select a suitable gasket from the pre-stored gaskets based on the measurement data.

[0096] S4. Assemble the gap-eliminating gasket 40 into the axial end gap of the worm 30. In this application, manual assembly of the gap-eliminating gasket 40 is used, or automated equipment can also be used for assembly.

[0097] In a specific embodiment of the present invention, the thickness specifications of the gap-eliminating gaskets 40 are arranged in an arithmetic gradient. The thickness specifications of the gap-eliminating gaskets 40 in this application are 0.1 mm, 0.2 mm, 0.3 mm, and so on. Other specification gradients can also be set according to the accuracy requirements.

[0098] The present invention also provides a gap elimination device, including a mechanical clamping arm, a probe, a display, and a gasket box:

[0099] The mechanical clamping arm is used to clamp and rotate the worm gear 20. The function of this component is to clamp and rotate the worm gear 20 and the vehicle machine screen.

[0100] The probe is arranged along the axial direction of the worm 30, and the head of the probe abuts against the radial surface of the worm gear 20 to measure the axial displacement of the worm 30 during the rotation of the worm gear 20. The probe is an elastic telescopic structure. When the head of the probe abuts against the radial surface of the worm gear 20, it can expand and contract along with the axial displacement of the worm 30. This arrangement enables the probe to measure the axial displacement of the worm 30 during the rotation of the worm gear 20. By monitoring these displacement amounts, the system can obtain information about the gaps at both ends of the worm 30.

[0101] The display is used to display the gap value according to the axial displacement. It may provide real-time data, enabling the operator or the system to immediately understand the gap situation between the worm gear 20 and the worm 30.

[0102] The shim box is used to eject or expose a backlash shim 40 of a corresponding size according to the axial displacement amount. The shim box is a box for storing the backlash shims 40. According to the axial displacement amount measured by the probe, the shim box can automatically eject or display a backlash shim 40 of a corresponding size. This design allows the system to quickly select and apply a shim of an appropriate size when the clearance needs to be adjusted, so as to eliminate or adjust the clearance between the worm gear 20 and the worm 30.

[0103] In summary, the present invention provides a worm gear mechanism, a method for manufacturing a worm gear, a method for eliminating clearance and a device. In the above solution, a backlash shim 40 is added to the end of the worm 30 to reduce the clearance, thereby reducing the overall wobbling amount. At the same time, the specification of the backlash shim 40 is automatically selected through equipment detection, so that manual comparison is not required, reducing the manual operation steps, and at the same time ensuring that the specification of the backlash shim 40 conforms to the clearance at the end of the worm 30. In the above solution, the process can be reduced by first injection molding the tooth profile and then performing finish machining. And since the accuracy of the injection mold can be controlled, the tooth profile position of the nylon worm gear has a high accuracy when the injection molding is completed. During reprocessing, the processing steps can be reduced, cumulative errors can be avoided, and at the same time, the generation of waste between teeth can be reduced.

[0104] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

[0105] In the description herein, numerous specific details are provided, such as examples of components and / or methods, to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or by other devices, systems, components, methods, components, materials, parts, etc. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0106] Throughout the specification, the references to "one embodiment", "an embodiment", or "a specific embodiment" mean that the particular features, structures, or characteristics described in connection with the embodiment are included in at least one embodiment of the invention and not necessarily in all embodiments. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", or "in a specific embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Further, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined in any suitable manner with one or more other embodiments. It should be understood that other variations and modifications of the embodiments of the invention described and shown herein may be made in accordance with the teachings herein and will be considered part of the spirit and scope of the invention.

[0107] It should also be understood that one or more of the elements shown in the figures can be implemented in a more separated or more integrated manner, or even removed in some cases where they are inoperable or provided because they can be useful in a particular application.

[0108] In addition, unless otherwise explicitly specified, any marked arrows in the figures should be considered merely exemplary and not limiting. Further, unless otherwise indicated, the term "or" as used herein generally intends to mean "and / or". Where combinations of components or steps are anticipated because the term is unclear as to providing separation or combination capabilities, the combination of components or steps will also be considered to be specified.

[0109] As used in the description herein and throughout the claims below, unless otherwise indicated, the singular forms "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims below, unless otherwise indicated, the meaning of "in" includes "in" and "on".

[0110] The foregoing description of the embodiments of the invention shown (including what is described in the abstract) is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of the invention and examples of the invention have been described herein for illustrative purposes only, various equivalent modifications will be within the spirit and scope of the invention as will be recognized and understood by those skilled in the art. As noted, these modifications of the invention can be made in accordance with the foregoing description of the embodiments of the invention and these modifications will be within the spirit and scope of the invention.

[0111] The present disclosure has described systems and methods in general terms to facilitate an understanding of the details of the present invention. In addition, various specific details have been given to provide a general understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or with other devices, systems, components, methods, assemblies, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0112] Accordingly, while the present invention has been described herein with reference to its specific embodiments, modifications, various changes and substitutions are also within the above disclosure, and it should be understood that in some instances, some features of the present invention may be employed without corresponding use of other features, without departing from the scope and spirit of the claimed invention. Therefore, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms and / or the specific embodiments disclosed as the best mode contemplated for carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the present invention will be determined only by the appended claims.

Claims

1. A worm and worm gear mechanism, characterized in that, Comprising: A base provided with an installation cavity; A worm gear disposed in the installation cavity; A worm disposed in the installation cavity and meshing with the worm gear; A backlash eliminator gasket disposed on the axial end of the worm to fill the gap between the worm and the base.

2. The worm and worm gear mechanism according to claim 1, characterized in that, Bearings are provided at both ends of the worm, and the base is provided with a clamping groove for accommodating the bearings.

3. The worm and worm gear mechanism according to claim 2, characterized in that, The worm includes an inner shaft and an outer shaft fixedly arranged coaxially. The two ends of the outer shaft abut against the end faces of the bearings, and the inner shaft passes through the bearings.

4. The worm and worm gear mechanism according to claim 3, characterized in that, The backlash eliminator gasket is disposed between the end face of the inner shaft and the groove wall of the clamping groove.

5. A method for manufacturing a worm wheel for a worm and worm wheel mechanism as described in any one of claims 1 - 4, characterized in that, Including the following steps: Filling nylon injection material into a mold to injection-mold a rough worm gear blank with a toothed blank; Machining the toothed blank of the rough worm gear blank to form a finished product of the worm gear 20.

6. The method for manufacturing a worm wheel according to claim 5, characterized in that, Before the step of machining the toothed blank of the rough worm gear blank to form a finished product of the worm gear 20, soaking the rough worm gear blank.

7. The method for manufacturing a worm wheel according to claim 5, characterized in that, The contour of the toothed blank of the rough worm gear blank covers the tooth profile of the finished product of the worm gear 20.

8. A method for eliminating the clearance of a worm and worm gear mechanism according to any one of claims 1-4, characterized in that, Including the following steps: Clamping and rotating the worm gear by a clamping device; Measuring and recording the axial displacement of the worm during the rotation of the worm gear by a measuring device; Selecting a backlash eliminator gasket corresponding to the size of the axial displacement; Assembling the backlash eliminator gasket into the axial end clearance of the worm.

9. The worm and worm gear clearance elimination method according to claim 8, characterized in that, In the step of selecting a backlash eliminator gasket corresponding to the size of the axial displacement, it includes: When the axial displacement is less than a preset threshold, giving a prompt that there is no need to eliminate the gap and directly entering the next process; When the axial displacement is greater than the preset threshold, selecting a backlash eliminator gasket corresponding to the size of the axial displacement.

10. The gap elimination method according to claim 8, characterized in that In the step of selecting a backlash eliminator gasket corresponding to the size of the axial displacement, it includes: Obtaining a clearance value by truncation method for the axial displacement; Selecting a backlash eliminator gasket with the same thickness as the clearance value as the backlash eliminator gasket to be assembled.

11. The clearance elimination method according to claim 8, wherein The thickness specifications of the backlash eliminator gaskets are arranged in an arithmetic gradient.

12. A clearance elimination device for a worm and worm gear mechanism as described in any one of claims 1-4, characterized in that, Including: A mechanical clamping arm for clamping and rotating the worm gear; A probe arranged along the axial direction of the worm. The head of the probe abuts against the radial surface of the worm gear to measure the axial displacement of the worm during the rotation of the worm gear; A display for displaying the clearance value according to the axial displacement; A gasket box for popping up or exposing a backlash eliminator gasket of a corresponding size according to the axial displacement.

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