Adjustable gap eliminating structure, worm and gear mechanism and vehicle

Abstract

The invention provides an adjustable clearance eliminating structure, a worm and gear mechanism and a vehicle, the clearance eliminating mechanism comprises an auxiliary shell, a bearing sleeve, a limiting piece and an elastic piece, and the bearing sleeve moves in the axial direction of a mounting cavity formed by the auxiliary shell under the action of elastic force applied by the elastic piece so as to eliminate the meshing clearance between a worm gear and a worm. According to the technical scheme provided by the invention, the certain included angle is formed between the moving direction of the bearing sleeve and the axial direction of the worm, so that when a radial or axial gap is generated between the worm gear and the worm, the radial or axial gap can be automatically eliminated by pushing the bearing sleeve to rebound through the elastic piece; therefore, the conditions that the meshing clearance is increased due to the problems of abrasion and the like and abnormal sound is generated in the operation process of the mechanism are effectively avoided, and free regulation and control of the resilience force can be achieved by adjusting the position of the limiting piece in the adjustable assembly area. The adjustable gap eliminating structure provided by the invention is relatively simple in composition and assembly, and has a promotable value.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mechanical transmission, and in particular to an adjustable clearance elimination structure, a worm gear mechanism and a vehicle. Background Art

[0002] With the continuous development and progress of the automotive industry, customers' evaluation criteria for passenger cars have gradually expanded from the most primitive fields such as power and fuel consumption to higher pursuit of comfort details such as noise, vibration and harshness (NVH) performance and steering comfort. In the steering system of the car, a worm gear mechanism is usually used to realize the conversion between the high-speed and low-torque of the motor and the low-speed and high-torque of the steering system: in the design of the gear meshing mechanism with a fixed worm, if the system is in a high-load working state for a long time, the gap between the worm and the bearing may cause axial clearance in the system; the wear between the worm teeth and the worm wheel teeth will also cause axial clearance in the system; this time, because the gear meshing mechanism with a fixed worm needs to be assembled by selecting the worm wheel size, the meshing clearance of the worm wheel after assembly cannot be guaranteed, and the meshing clearance after wear cannot be compensated by itself, which will cause radial clearance in the system.

[0003] It is understandable that both the axial clearance and the radial clearance will increase the BD degradation value of the worm gear meshing mechanism. When the BD degradation value exceeds the established specification, the worm gear meshing mechanism will produce abnormal noise, affecting the safety of use and user experience. Therefore, it is urgent to design an auxiliary structure to help the worm gear meshing mechanism autonomously eliminate the axial clearance and radial clearance that occur during assembly and use. Summary of the invention

[0004] In view of the problems in the prior art, the present invention aims to provide an adjustable clearance elimination structure, which can simultaneously eliminate the axial clearance and the radial clearance in the worm gear mechanism.

[0005] Specifically, a first aspect of the present disclosure provides an adjustable clearance elimination structure, which is applied to a worm gear mechanism, wherein the worm gear mechanism includes a worm wheel and a worm gear meshing with each other, and a first bearing disposed near one end of the worm gear;

[0006] Specifically, the adjustable gap elimination structure includes:

[0007] An auxiliary housing, wherein the auxiliary housing forms a mounting cavity, the mounting cavity is columnar, and the axial direction of the mounting cavity forms an angle less than 90° with the axial direction of the worm, and an adjustable assembly area is provided at one end of the auxiliary housing away from the worm;

[0008] The bearing sleeve is arranged in the installation cavity and can move along the axial direction of the installation cavity. The first end of the bearing sleeve is provided with a first groove for sleeve-mounting the first bearing, and the first groove is interference-fitted with the first bearing.

[0009] A limiter is arranged in the installation cavity through an adjustable assembly area and can move in the adjustable assembly area along the axial direction of the installation cavity;

[0010] An elastic member is arranged in the installation cavity and located between the limiting member and the bearing sleeve, one end of the elastic member contacts the limiting member, and the other end of the elastic member contacts the second end of the bearing sleeve;

[0011] The elastic force exerted by the elastic member on the bearing sleeve is adjusted according to the position of the limit member in the adjustable assembly area, and the bearing sleeve moves along the axial direction of the installation cavity under the action of the elastic force to eliminate the meshing clearance between the worm wheel and the worm.

[0012] In a possible implementation of the first aspect, the mounting cavity is a wedge-shaped cylinder, and a wedge-shaped surface of the wedge-shaped cylinder is close to the first bearing;

[0013] The side surface of the wedge-shaped cylinder is provided with at least one limiting groove or limiting protrusion distributed along the axial direction of the installation cavity;

[0014] The side surface of the bearing sleeve is matched with the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

[0015] In a possible implementation of the first aspect, the mounting cavity is a wedge-shaped column, and a wedge-shaped surface of the wedge-shaped column is close to the first bearing;

[0016] The side surface of the wedge-shaped column is composed of a plurality of planes and a plurality of arc surfaces arranged at intervals, and the boundary line between any plane and the arc surface is parallel to the axial direction of the installation cavity;

[0017] The side surface of the bearing sleeve is matched with the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

[0018] In a possible implementation of the first aspect, the mounting cavity is a wedge-shaped column, and a wedge-shaped surface of the wedge-shaped column is close to the first bearing;

[0019] The side surface of the wedge-shaped column is composed of a plurality of planes, and the boundary lines of any two planes are parallel to the axial direction of the installation cavity;

[0020] The side surface of the bearing sleeve is matched with the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

[0021] In a possible implementation of the first aspect above, the bearing sleeve is further provided with a second groove;

[0022] The second groove is arranged in the first groove and is used for accommodating the end of the worm gear close to the first bearing.

[0023] In a possible implementation of the first aspect above, the adjustable assembly area includes a thread covering area;

[0024] The surface of the stopper matches the thread-covered area and is threadedly connected to the auxiliary housing;

[0025] The elastic force applied by the elastic member to the bearing sleeve is adjusted by adjusting the position of the limiting member in the thread covering area.

[0026] In a possible implementation of the first aspect, the elastic member includes a combination of one or more of a coil spring, a steel corrugated spring, a steel disc spring, a rubber O-type corrugated ring, and a rubber vibration isolator.

[0027] A second aspect of the present disclosure provides a worm gear mechanism, which may specifically include:

[0028] case;

[0029] A worm wheel and a worm screw disposed in the housing and meshing with each other;

[0030] A first bearing and a second bearing disposed near an end of the worm; and

[0031] The adjustable gap elimination structure provided in the first aspect above.

[0032] In a possible implementation of the second aspect above, the housing and an auxiliary housing of the adjustable gap elimination structure are integrally formed.

[0033] The third aspect of the present disclosure provides a vehicle, which includes a power-assist motor, a steering shaft and the worm gear mechanism provided by the second aspect, wherein the power-assist motor is connected to the worm of the worm gear mechanism, and the steering shaft is connected to the worm wheel of the worm gear mechanism.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] Through the technical solution provided by the present invention, based on the cooperation of the bearing sleeve and the elastic member, the gap between the worm wheel and the worm can be eliminated in the initial stage of assembly; because the moving direction of the bearing sleeve is at a certain angle to the axial direction of the worm, when radial or axial gaps are generated between the worm wheel and the worm, the elastic member pushes the rebound of the bearing sleeve to automatically eliminate the radial and axial gaps, thereby effectively avoiding the increase of meshing gaps caused by wear and other problems and the generation of abnormal noises during the operation of the mechanism; by adjusting the position of the limiter in the adjustable assembly area, the rebound force can be freely regulated. The adjustable gap elimination structure provided by the present invention is relatively simple in composition and assembly, and has a value for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Other features, objects and advantages of the present disclosure will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0037] Figure 1 According to the prior art, a partial cross-sectional structural schematic diagram of a worm gear meshing mechanism is provided.

[0038] Figure 2 According to an embodiment of the present disclosure, a partial cross-sectional schematic diagram of a worm gear structure with an adjustable clearance eliminating structure is provided.

[0039] Figure 3 According to an embodiment of the present disclosure, a simplified diagram of force analysis of a worm gear mechanism is provided.

[0040] Figure 4a According to an embodiment of the present disclosure, a schematic diagram of a partial structure of an auxiliary shell at a specific viewing angle is provided.

[0041] Figure 4b According to an embodiment of the present disclosure, there is provided a Figure 4a A schematic structural diagram of a bearing sleeve adapted to the auxiliary housing is shown.

[0042] Figure 4c According to an embodiment of the present disclosure, a structural schematic diagram of a limiter is provided.

[0043] Figure 5 According to an embodiment of the present disclosure, a configuration method of a worm gear mechanism using the adjustable backlash elimination structure provided by the aforementioned embodiment is provided. DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application systems without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0045] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0046] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials, or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials, or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0049] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0050] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0051] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0052] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0053] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the content of relevant technical literature and current disclosures, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0054] In the context of existing technology, Figure 1 A partial cross-sectional structural diagram of a worm gear meshing mechanism is shown, as Figure 1 As shown, the worm wheel 001 and the worm 002 are both arranged in the housing 003, and the worm wheel 001 is meshed with the worm 002; one end of the worm 002 is connected to the output shaft of the motor, and the other end is a free end, and a first bearing 004 and a second bearing 005 are respectively arranged at both ends of the worm 002, wherein the first bearing 004 is arranged on one side of the free end of the worm 002, and the second bearing 005 is arranged on the side of the worm 002 close to the output shaft of the motor. Since the worm 002 has a free end, radial clearance and axial clearance will appear during subsequent assembly and use.

[0055] In order to overcome the axial error and radial error of the worm gear mechanism provided in the prior art during assembly and use, in some embodiments of the present disclosure, an adjustable clearance elimination structure applied to the worm gear structure is provided, which can realize automatic compensation and elimination of axial clearance and radial clearance. Specifically, Figure 2 A partial cross-sectional schematic diagram of a worm gear structure with an adjustable clearance elimination structure is shown, such as Figure 2 As shown, the adjustable gap elimination structure may specifically include:

[0056] Auxiliary housing 201, such as Figure 2 As shown, the auxiliary housing 201 provides a mounting cavity 201a, which is columnar, and the axial direction of the mounting cavity 201a forms an angle less than 90° with the axial direction of the worm 002, that is, the auxiliary housing 201 provides a mounting space with a certain inclination angle relative to the horizontally arranged worm 002. An adjustable assembly area 201d is provided at one end of the auxiliary housing 201 away from the worm, and the specific setting of the adjustable assembly area 201d will be described in detail later.

[0057] The bearing sleeve 202 is disposed in the mounting cavity 201a and can move along the axial direction of the mounting cavity 201a. The first end of the bearing sleeve 202 is provided with a first groove 202a (not shown in the figure) for sleeve-mounting the first bearing. The first groove 202a is interference-fitted with the first bearing 004. Figure 2 As shown, the bearing sleeve 202 is wedge-shaped as a whole and matches the mounting cavity 201a. It can move along the axial direction of the mounting cavity 201a. The first groove 202a set at its first end cooperates with the first bearing 004 to stabilize the first bearing 004.

[0058] The limiting member 204 is disposed in the mounting cavity 201a through the adjustable assembly area 201d, and can move in the adjustable assembly area 201d along the axial direction of the mounting cavity 201a.

[0059] The elastic member 203 is disposed in the installation cavity 201a and between the stopper 204 and the bearing sleeve 202. One end of the elastic member 203 contacts the stopper 204, and the other end of the elastic member 203 contacts the second end of the bearing sleeve 202. The specific arrangement of the elastic member 203 will be described in detail later.

[0060] For the above-mentioned adjustable gap elimination structure, the elastic force applied by the elastic member 203 to the bearing sleeve 202 is adjusted according to the position of the limit member 204 in the adjustable assembly area 201d. The bearing sleeve 202 moves along the axial direction of the installation cavity 201a under the action of the elastic force to eliminate the meshing gap between the worm wheel 001 and the worm 002.

[0061] It is understandable that, for the worm gear mechanism system, the axial clearance and radial clearance may be generated during the assembly stage and the use stage of the turbine 001. Specifically, Figure 3 A schematic diagram of the force analysis of a worm gear mechanism is shown. Taking the assembly stage as an example, when the turbine 001 and the worm 002 are initially assembled, the worm 002 will move radially upward and axially to the right due to the influence of the assembly force (at Figure 3 The central axis 002a of the worm 002 is used as a reference. The central axis 002a of the worm in the initial state is 002b after the movement, so that the bearing sleeve 202 moves upward compared to the initial position (at Figure 3 In the figure, the initial position of the bearing sleeve 202 is 202A, and the position of the bearing sleeve 202 after moving upward is 202B), thereby compressing the elastic member 203; the elastic deformation part of the elastic member 203 generates a rebound force F after compression, and generates an axial force F*cosδ and a radial force F*sinδ relative to the worm 002 through force decomposition, where δ is an angle less than 90° formed by the axial direction of the installation cavity 201a and the axial direction of the worm 002. The worm 002 compensates for the gap under the action of the rebound force and finally eliminates the gap generated; the above analysis process is also applicable to the gap generated during the use stage. That is, in the process of generating the gap, the bearing sleeve 202 is acted upon by the elastic force applied by the elastic member 203, and moves along the axial direction of the installation cavity 201a, toward the direction close to the worm 002, so as to eliminate the meshing gap between the worm wheel and the worm. In the above process, since the generation of the rebound force F is related to the degree of deformation of the elastic member 203, the closer the limit member 204 is to the area where the worm 002 is located, the greater the rebound force F generated by the elastic member after the gap is generated. Technical personnel in this field can select the position of the limit member 204 in the adjustable assembly area 201d according to actual needs during actual use, and can also dynamically adjust the position of the limit member 204 in the adjustable assembly area 201d during use, which is not limited here.

[0062] Through the above description, the adjustable gap elimination structure provided by the present disclosure can realize automatic compensation and elimination of axial gap and radial gap, and can autonomously adjust the elastic force used for automatic compensation and elimination. The specific implementation of each component in the above adjustable gap elimination structure will be further described below:

[0063] In some embodiments of the present disclosure, the installation cavity 201a may be a wedge-shaped cylinder, wherein the wedge-shaped surface is close to the first bearing 004. It is worth noting that the side of the wedge-shaped cylinder is provided with at least one guide limiter distributed along the axial direction of the installation cavity, that is, at least one limit groove or limit protrusion distributed along the axial direction of the installation cavity 201a is provided on the inner side wall of the auxiliary housing 201; accordingly, the side surface of the bearing sleeve 202 is matched with the inner side wall of the auxiliary housing 201, that is, a protrusion or groove body matched with the limit groove or limit protrusion is provided, so that the bearing sleeve 202 can only move along the axial direction of the installation cavity 201a, and will not generate self-rotation or movement in other directions in the installation cavity 201a. It is understandable that if the inner wall of the auxiliary shell 201 is a smooth cylindrical side, in the process of the worm gear mechanism generating axial and radial clearances, the wedge-shaped block-shaped bearing sleeve 202 may produce self-rotation or movement in other directions in the auxiliary shell 201 due to uneven force, resulting in abnormal conditions such as a gap with the first bearing 004, making it impossible for the adjustable gap elimination structure to automatically compensate for the axial and radial clearances. Therefore, when designing the auxiliary shell 201, it is necessary to limit the self-rotation or movement of the bearing sleeve 202 in other directions so that it can only move along the axial direction of the mounting cavity 201a.

[0064] Similarly, in some other embodiments of the present disclosure, the mounting cavity 201a may be a wedge-shaped cylinder, wherein the wedge-shaped surface is close to the first bearing 004. The side surface of the wedge-shaped cylinder may be composed of a plurality of planes and a plurality of curved surfaces arranged at intervals, or may be composed of a plurality of planes, and the boundary line between any one plane and the curved surface or the boundary line between any two planes are parallel to the axial direction of the mounting cavity. Accordingly, the side surface of the bearing sleeve 202 is adapted to the inner side wall of the auxiliary housing 201, that is, it is composed of a plurality of planes and a plurality of curved surfaces arranged at the same intervals or is composed of a plurality of the same planes. This arrangement is also for the purpose of limiting the self-rotation or movement of the bearing sleeve 202 in the auxiliary housing 201. Specifically, Figure 4a A schematic diagram of a partial structure of the auxiliary housing 201 at a specific viewing angle is shown. Figure 4b Shows a Figure 4a The structure diagram of the bearing sleeve 202 matched with the auxiliary housing 201 is shown in FIG. Figure 4a and Figure 4b As shown, it can be seen that the inner wall of the auxiliary shell 201 includes a trapezoidal plane 201b and an arc surface 201c, and the corresponding surface of the bearing sleeve 202 also includes a trapezoidal plane 202b and an arc surface 202c. Through the matching of the corresponding planes and arc surfaces, the bearing sleeve 202 is limited to move only along the axial direction of the mounting cavity 201a.

[0065] In some embodiments of the present disclosure, Figure 4bAs shown, the bearing sleeve 202 is provided with a second groove 202d in addition to the first groove 202a adapted to the first bearing 004. Figure 4b As shown, the second groove 202d is arranged at the bottom of the first groove 202a, and its diameter is adapted to the worm 002. Figure 4a It can be seen that the second groove 202 d is used to accommodate the end of the worm 002 close to the first bearing 004 .

[0066] In some embodiments of the present disclosure, Figure 4a As shown, the adjustable assembly area 201d may include a threaded covering area; correspondingly, Figure 4c A schematic diagram of the structure of a limiter is shown, such as Figure 4c As shown, the surface of the stopper 204 has a thread structure matching the threaded covering area to achieve a threaded connection with the auxiliary housing 201, and the stopper 204 also includes a stopper groove 204a, which is used to contact the elastic deformation portion of the elastic member 203 and accommodate and reserve the elastic member 203. It can be understood by those skilled in the art that the area of ​​the threaded covering area is larger than the side surface area of ​​the stopper 204, and the position of the stopper 204 in the threaded covering area is adjusted by adjusting the screw-in depth of the stopper 204, thereby achieving the adjustment of the elastic force applied by the elastic member to the bearing sleeve.

[0067] In some embodiments of the present disclosure, further, the elastic member 203 may include a combination of one or more of a coil spring, a steel corrugated spring, a steel disc spring, a rubber O-ring and a rubber isolator, which is not limited here.

[0068] In some embodiments of the present disclosure, Figure 2 As shown, in the actual implementation process, the housing 003 and the auxiliary housing 201 of the adjustable gap elimination structure can be prepared by an integral molding method, which is not limited here.

[0069] In some embodiments of the present disclosure, Figure 5 A configuration method for a worm gear mechanism using the adjustable backlash elimination structure provided in the above-mentioned embodiment is provided, such as Figure 5 Specifically, it may include:

[0070] Step 501: Assemble a first bearing and a bearing sleeve in an auxiliary housing.

[0071] Step 502: Assemble and fix the worm from the motor side.

[0072] Step 503: Assemble the elastic member in the auxiliary housing.

[0073] Step 504: Assemble the stopper in the auxiliary housing. It is understandable that after the stopper is assembled, the initial gap between the worm gear and the worm will be absorbed by the resilience of the elastic member; in the subsequent use process, the bearing sleeve slides further forward under the push of the resilience of the elastic member, thereby absorbing the axial gap and radial gap caused by gear tooth wear and deformation; and by changing the position of the stopper, the resilience of the elastic member when facing the same gap can be dynamically adjusted, which can better adapt to different practical application scenarios.

[0074] In some embodiments of the present disclosure, a vehicle is also provided, which includes a power-assisting motor, a steering shaft, and a worm gear mechanism provided by the second aspect mentioned above, wherein the power-assisting motor is connected to the worm of the worm gear mechanism, and the steering shaft is connected to the worm wheel of the worm gear mechanism.

[0075] In summary, through the technical solution provided by the present invention, based on the cooperation of the bearing sleeve and the elastic member, the gap between the worm wheel and the worm can be eliminated in the initial stage of assembly; because the moving direction of the bearing sleeve is at a certain angle to the axial direction of the worm, when radial or axial gaps are generated between the worm wheel and the worm, the elastic member pushes the rebound of the bearing sleeve to automatically eliminate the radial and axial gaps, thereby effectively avoiding the increase of the meshing gap caused by wear and other problems and the generation of abnormal noises during the operation of the mechanism; by adjusting the position of the limiter in the adjustable assembly area, the rebound force can be freely regulated. The adjustable gap elimination structure provided by the present invention is relatively simple in composition and assembly, and has popularizable value.

[0076] The above content is a further detailed description of the present disclosure in combination with specific preferred implementation modes, and it cannot be determined that the specific implementation of the present disclosure is limited to these descriptions. For ordinary technicians in the technical field to which the present disclosure belongs, several simple deductions or substitutions can be made without departing from the concept of the present disclosure, which should be regarded as falling within the scope of protection of the present disclosure.

Claims

1. An adjustable clearance elimination structure, applied to a worm gear mechanism, the worm gear mechanism comprising a worm wheel and a worm that mesh with each other, and a first bearing disposed near one end of the worm; It is characterized in that The adjustable gap elimination structure comprises: An auxiliary housing, wherein the auxiliary housing forms a mounting cavity, the mounting cavity is columnar, and the axial direction of the mounting cavity forms an angle less than 90° with the axial direction of the worm, and an adjustable assembly area is provided at one end of the auxiliary housing away from the worm; A bearing sleeve is disposed in the installation cavity and can move along the axial direction of the installation cavity, wherein a first groove for sleeve-mounting the first bearing is disposed at a first end of the bearing sleeve, and the first groove is interference-fitted with the first bearing; A limiter, which is disposed in the mounting cavity through the adjustable mounting area and can move in the adjustable mounting area along the axial direction of the mounting cavity; An elastic member, disposed in the installation cavity and located between the limiting member and the bearing sleeve, one end of the elastic member contacts the limiting member, and the other end of the elastic member contacts the second end of the bearing sleeve; The elastic force applied by the elastic member to the bearing sleeve is adjusted according to the position of the limit member in the adjustable assembly area, and the bearing sleeve moves along the axial direction of the installation cavity under the elastic force to eliminate the meshing clearance between the worm wheel and the worm.

2. The adjustable gap elimination structure according to claim 1, characterized in that: The installation cavity is in the form of a wedge-shaped cylinder, and the wedge-shaped surface of the wedge-shaped cylinder is close to the first bearing; The side surface of the wedge-shaped cylinder is provided with at least one limiting groove or limiting protrusion distributed along the axial direction of the installation cavity; The side surface of the bearing sleeve is adapted to the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

3. The adjustable gap elimination structure according to claim 1, characterized in that: The installation cavity is in the form of a wedge-shaped column, and the wedge-shaped surface of the wedge-shaped column is close to the first bearing; The side surface of the wedge-shaped column is composed of a plurality of planes and a plurality of arc surfaces arranged at intervals, and the boundary line between any of the planes and the arc surface is parallel to the axial direction of the installation cavity; The side surface of the bearing sleeve is adapted to the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

4. The adjustable gap elimination structure according to claim 1, characterized in that: The installation cavity is in the form of a wedge-shaped column, and the wedge-shaped surface of the wedge-shaped column is close to the first bearing; The side surface of the wedge-shaped column is composed of a plurality of planes, and the boundary lines of any two of the planes are parallel to the axial direction of the installation cavity; The side surface of the bearing sleeve is adapted to the installation cavity so that the bearing sleeve can only move along the axial direction of the installation cavity.

5. The adjustable gap elimination structure according to claim 1, characterized in that: The bearing sleeve is also provided with a second groove; The second groove is arranged in the first groove, and is used for accommodating an end portion of the worm gear close to the first bearing.

6. The adjustable gap elimination structure according to claim 1, characterized in that: The adjustable assembly area includes a thread covering area; The surface of the stopper matches the threaded covering area and is threadedly connected to the auxiliary housing; The elastic force applied by the elastic member to the bearing sleeve is adjusted by adjusting the position of the limiting member in the thread covering area.

7. The adjustable gap elimination structure according to claim 1 or 6, characterized in that: The elastic member comprises a combination of one or more of a spiral spring, a steel corrugated spring, a steel disc spring, a rubber O-type corrugated ring and a rubber vibration isolator.

8. A worm gear mechanism, characterized in that: include: case; A worm wheel and a worm screw disposed in the housing and meshing with each other; a first bearing and a second bearing disposed near an end of the worm; as well as An adjustable gap elimination structure according to any one of claims 1 to 7.

9. The worm gear mechanism according to claim 8, characterized in that: The housing is integrally formed with an auxiliary housing of the adjustable gap eliminating structure.

10. A vehicle, comprising a power-assist motor and a steering shaft, characterized in that: The vehicle further comprises a worm gear mechanism according to claim 8 or claim 9, the power-assisting motor is connected to the worm of the worm gear mechanism, and the steering shaft is connected to the worm wheel of the worm gear mechanism.

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