An adaptive lifting mechanism and a car lifting machine

Abstract

The present invention belongs to the technical field of jacking equipment, and discloses an adaptive lifting mechanism and a car lifting machine. The adaptive lifting mechanism includes a mounting frame body, a lead screw, and a supporting component. The mounting frame body includes a top plate and a base plate that are parallel and spaced apart. The upper end of the lead screw is rotatably connected to the top plate. The supporting component is sleeved on the lead screw and is threadedly connected to the lead screw. An elastic support is provided on the base plate, and a limiting hole is formed in the elastic support. The lower end of the lead screw is rotatably inserted into the limiting hole. When the supporting component operates with unilateral eccentric load, the supporting component is subjected to a vertically downward pressure and a moment load in the clockwise direction. The lead screw can move slightly along the axial direction of the limiting hole, and the lower end of the lead screw can generate a slight displacement along its radial direction. By providing the elastic support, when the supporting component has a unilateral eccentric load, the lead screw can adaptively generate an axis offset in the same trend as the supporting component, reducing the deflection amount of the axis of the supporting component relative to the axis of the lead screw and improving the transmission efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and in particular, to an adaptive lifting mechanism and a car lifter. Background Art

[0002] Lifting equipment is widely used in the machinery industry, and its core is a drivable lifting mechanism. The lifting mechanism can lift the mechanism to be lifted, so as to form a certain operating space below the mechanism to be lifted. At the same time, it can support the mechanism to stably descend to its original position.

[0003] Exemplarily, in the transportation industry, vehicles need to be regularly maintained. When a transportation vehicle enters the workshop for maintenance, it is necessary to lift the vehicle body by a car lifter so as to perform maintenance operations on the locomotive vehicle. The lifting mechanism of the car lifter includes a vertically arranged lead screw and a nut sleeved on the lead screw, and a bracket is connected to the nut. During lifting, the bracket is supported under the vehicle body, and the lead screw is driven to rotate around its own axis, so that the nut can drive the bracket to move upward to realize the lifting of the vehicle body. Since the weight of the lifted vehicle is relatively large, the load borne by the bracket and the nut is also relatively large, and the car lifter is a single-sided eccentric load operation, resulting in a large eccentric load torque on the nut, which in turn causes the axis of the nut to be deflected relative to the axis of the lead screw, resulting in poor transmission, and relatively serious friction and wear of the nut.

[0004] In the prior art, the upper end of the lead screw is fixed to the housing of the car lifter through a thrust bearing and a radial bearing, and the other end is fixed to the base through a sliding simply supported method. The simply supported method provides a limiting force for the lower end of the lead screw in the horizontal direction, causing the lead screw to have a relatively serious bending deformation, that is, a large radial displacement, which further aggravates the deflection of the axis of the nut relative to the axis of the lead screw, resulting in increased wear of the nut, low transmission efficiency, and easy occurrence of phenomena such as lifting creep and jamming, and poor operating performance of the car lifter. Summary of the Invention

[0005] The purpose of the present invention is to provide an adaptive lifting mechanism and a car lifter, during the single-sided eccentric load operation process, the lower end of the lead screw can adaptively move, so as to effectively reduce the deflection amount of the axis of the nut relative to the axis of the lead screw, and make the lifting transmission process stable and reliable.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, an adaptive lifting mechanism is provided, including:

[0008] A mounting frame body, including a top plate and a base arranged in parallel and at intervals;

[0009] A lead screw, the upper end of the lead screw is rotatably connected to the top plate;

[0010] A supporting component, sleeved on the lead screw and threadedly connected to the lead screw;

[0011] An elastic support, connected to the base. A limiting hole is formed in the elastic support. The lower end of the lead screw is rotatably inserted into the limiting hole and can move along the axial direction of the limiting hole. When the supporting component is unilaterally loaded, the lower end of the lead screw can move radially.

[0012] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the elastic support includes a support component and an elastic component. The support component is connected to the base. An installation cavity is formed in the support component. The elastic component is arranged in the installation cavity. The limiting hole is formed in the elastic component.

[0013] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the elastic component includes a rigid bushing and an elastic bushing. The outer wall of the elastic bushing cooperates with the cavity wall of the installation cavity. The rigid bushing is inserted into the elastic bushing. The inner cavity of the rigid bushing is the limiting hole.

[0014] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the rigid bushing includes a copper bushing. A plurality of through holes are spacedly arranged on the side wall of the copper bushing. A graphite structure is embedded in each through hole.

[0015] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the elastic bushing is a rubber bushing, and the rubber bushing is vulcanized to the cavity wall of the installation cavity.

[0016] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the support component includes a limiting sleeve. The inner cavity of the limiting sleeve is the installation cavity. The bottom end of the limiting sleeve protrudes outward to form a flange, and the flange is detachably connected to the base.

[0017] As a preferred solution of the adaptive lifting mechanism provided by the present invention, a limiting ring protrudes from the inner wall of the limiting sleeve. The lower end of the lead screw passes through the ring opening of the limiting ring and extends into the limiting hole. There is a gap between the outer wall of the lead screw and the inner wall of the limiting ring. The elastic component is limited between the limiting ring and the base.

[0018] As a preferred solution of the adaptive lifting mechanism provided by the present invention, it further includes a plurality of fasteners. The plurality of fasteners are spacedly distributed along the circumferential direction of the flange. Each fastener passes through the flange and is threadedly connected to the base.

[0019] As a preferred solution of the adaptive lifting mechanism provided by the present invention, the supporting assembly includes a lifting nut, a nut connecting seat and an overhanging bracket. The lifting nut is threadedly connected to the lead screw. The overhanging bracket is connected to the lifting nut through the nut connecting seat. The overhanging bracket is configured to support the mechanism to be lifted.

[0020] In a second aspect, a car lifter is provided, which includes the adaptive lifting mechanism as described above.

[0021] Advantages of the present invention:

[0022] The present invention provides an adaptive lifting mechanism, which includes a mounting frame body, a lead screw and a supporting assembly. The mounting frame body includes a top plate and a base plate that are parallel and spaced apart. The upper end of the lead screw is rotatably connected to the top plate. The supporting assembly is sleeved on the lead screw and is threadedly connected to the lead screw. When it is necessary to lift the mechanism to be lifted, the supporting assembly is supported on the bottom surface of the mechanism to be lifted. Subsequently, the lead screw is driven to rotate so that the supporting assembly drives the mechanism to be lifted to rise under the transmission action of the lead screw. An elastic support is provided on the base plate, and a limiting hole is formed in the elastic support. The lower end of the lead screw is rotatably inserted into the limiting hole so that the lead screw can smoothly rotate around its own axis, and the lower end of the lead screw can move axially along the limiting hole. When the supporting assembly operates with unilateral eccentric load, the supporting assembly is subjected to a vertically downward pressure and a moment load in the clockwise direction. The pressure and load are transmitted to the lead screw, so that the lead screw moves slightly axially along the limiting hole, and the lower end of the lead screw can generate a slight displacement in its radial direction. That is to say, by providing the elastic support, when the supporting assembly has a unilateral eccentric load, the lead screw can adaptively generate an axis offset in the same trend as the supporting assembly, so as to effectively reduce the skew amount of the axis of the supporting assembly relative to the axis of the lead screw, relieve the wear during lifting transmission, and improve the transmission efficiency.

[0023] The present invention also provides a car lifter including the above-mentioned adaptive lifting mechanism. Among them, while the elastic support provides a certain constraint for the lower end of the lead screw, it can enable the lead screw to adaptively generate an axis offset in the same trend as the supporting assembly. The car lifter can adapt to the dynamically changing vehicle body load during the process of lifting the vehicle body, maintain a stable and reliable lifting movement, avoid phenomena such as lifting crawling and jamming, and improve the operating performance of the car lifter. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the adaptive lifting mechanism provided by the specific embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the cooperation between the lower end of the lead screw and the elastic support provided by the specific embodiment of the present invention;

[0026] Figure 3It is a schematic diagram of the deformation of the lead screw under three support states provided by the specific implementation manner of the present invention.

[0027] In the figure:

[0028] 1. Mounting frame; 2. Lead screw; 3. Support component; 4. Elastic support;

[0029] 11. Top plate; 12. Base; 13. Vertical plate;

[0030] 31. Nut; 32. Nut connecting seat; 33. Overhanging bracket;

[0031] 41. Support component; 411. Limit sleeve; 412. Flange; 413. Limit ring;

[0032] 42. Elastic component; 421. Rigid bushing; 4211. Limit hole; 422. Elastic bushing. Specific implementation manner

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0034] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. They are only for convenience of description and simplifying operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] As Figure 1 shown, this embodiment provides an adaptive lifting mechanism, which includes a mounting frame 1, a lead screw 2, a supporting component 3, and an elastic support 4.

[0038] Among them, referring to Figure 1 , the mounting frame 1 includes a top plate 11 and a base 12 that are parallel and spaced apart. The upper end of the lead screw 2 is rotatably connected to the top plate 11. The supporting component 3 is sleeved on the lead screw 2 and is threadedly connected to the lead screw 2. When it is necessary to lift the mechanism to be lifted, the supporting component 3 is supported on the bottom surface of the mechanism to be lifted. Subsequently, the lead screw 2 is driven to rotate so that the supporting component 3 drives the mechanism to be lifted to rise under the transmission action of the lead screw 2. Exemplarily, a driving motor is provided on the top plate 11. The housing of the driving motor is fixedly installed on the top plate 11, and the output end of the driving motor is in transmission connection with the upper end of the lead screw 2. During lifting, the driving motor is started, and the lead screw 2 can rotate around its own axis. At the same time, the supporting component 3 moves upward relative to the lead screw 2, and the mechanism to be lifted moves upward synchronously under the lifting force of the supporting component 3.

[0039] Optionally, the mounting frame 1 further includes a vertical plate 13. Both the top plate 11 and the base 12 are connected to the vertical plate 13, and the vertical plate 13 can play a role in stably supporting the top plate 11 and the base 12.

[0040] Referring to Figure 1 , the elastic support 4 is provided on the base 12. A limiting hole 4211 is formed in the elastic support 4, and the lower end of the lead screw 2 is rotatably inserted into the limiting hole 4211 so that the lead screw 2 can smoothly rotate around its own axis, and the lower end of the lead screw 2 can move along the axial direction of the limiting hole 4211. When the supporting component 3 operates with unilateral eccentric load, the supporting component 3 is subjected to a vertically downward pressure and a clockwise bending moment load. The pressure and load are transmitted to the lead screw 2, causing the lead screw 2 to move slightly along the axial direction of the limiting hole 4211, and the lower end of the lead screw 2 can generate a slight displacement along its radial direction. That is to say, by providing the elastic support 4, when the supporting component 3 has a unilateral eccentric load, the lead screw 2 can adaptively generate an axis offset in the same trend as the supporting component 3, effectively reducing the deflection amount of the axis of the supporting component 3 relative to the axis of the lead screw 2, alleviating the wear during lifting transmission, and improving the transmission efficiency.

[0041] Optionally, referring to Figure 1, the elastic support 4 includes a support assembly 41 and an elastic assembly 42. The support assembly 41 is fixedly connected to the base 12. The support assembly 41 is a rigid member, and an installation cavity is formed thereon. The elastic assembly 42 is disposed in the installation cavity, and a limiting hole 4211 is formed on the elastic assembly 42. Disposing the elastic assembly 42 in the installation cavity can increase the contact area between the elastic assembly 42 and the support assembly 41, so that the support assembly 41 can provide a stable supporting effect for the elastic assembly 42, thereby restricting excessive downward displacement of the lower end of the lead screw 2 passing through the elastic assembly 42.

[0042] See Figure 2 , in this embodiment, the elastic assembly 42 includes a rigid bushing 421 and an elastic bushing 422. Both the rigid bushing 421 and the elastic bushing 422 are in a sleeve shape. The outer wall of the elastic bushing 422 is fitted with the wall of the installation cavity, the rigid bushing 421 is disposed through the elastic bushing 422, and the inner cavity of the rigid bushing 421 is the above-mentioned limiting hole 4211. That is, the lower end of the lead screw 2 is rotatably disposed through the inner cavity of the rigid bushing 421 and can move slightly in the vertical direction in the inner cavity. The elastic bushing 422 is clamped between the outer wall of the rigid bushing 421 and the inner wall of the support assembly 41. The inner wall of the elastic bushing 422 abuts against the outer wall of the rigid bushing 421, and the outer wall abuts against the wall of the installation cavity. When the supporting assembly 3 is unilaterally eccentrically loaded, the elastic bushing 422 can adaptively elastically deform to cause a compliant displacement of the lower end of the lead screw 2.

[0043] It can be understood that in this embodiment, the rigid bushing 421 and the elastic bushing 422 are separate. Of course, in other embodiments, the elastic assembly 42 may also only include the elastic bushing 422, that is, the lower end of the lead screw 2 is rotatably disposed through the inner cavity of the elastic bushing 422 and can move slightly in the vertical direction in the inner cavity. That is to say, in this case, the inner wall of the elastic bushing 422 abuts against the outer wall of the lower end of the lead screw 2, and the outer wall abuts against the wall of the installation cavity. When the supporting assembly 3 is unilaterally eccentrically loaded, the elastic bushing 422 can also adaptively elastically deform to cause a compliant displacement of the lower end of the lead screw 2.

[0044] Further, in this embodiment, the elastic bushing 422 is a rubber bushing. That is, the elastic bushing 422 is made of rubber material. Preferably, the rubber bushing is vulcanized on the wall of the installation cavity. During processing, the unformed rubber material is directly formed on the wall of the installation cavity of the support assembly 41 through a vulcanization process combined with a molding method, so that the support assembly 41 and the rubber bushing form an integral component, which can prevent the rubber bushing from moving when it adaptively compresses and deforms, and improve stability.

[0045] Optionally, in this embodiment, the rigid bushing 421 includes a copper bushing. A plurality of through holes are spaced apart on the side wall of the copper bushing, and a graphite structure is embedded in each through hole. The copper bushing has the advantages of good wear resistance, small friction coefficient, and long service life. The lower end of the lead screw 2 passes through the steel bushing and can rotate relative to the copper bushing and move axially along the copper bushing. The graphite structure embedded in the copper bushing can provide a lubricating effect between the lead screw 2 and the copper bushing, reducing the frictional resistance when the lead screw 2 moves relative to the copper bushing. In addition, when the copper bushing slides relative to the elastic bushing 422 driven by the lead screw 2, the graphite structure can provide a lubricating effect between the copper bushing and the elastic bushing 422, reducing the frictional resistance when the copper bushing slides relative to the elastic bushing 422. By embedding the graphite structure on the copper bushing, the entire rigid bushing 421 can have a self-lubricating function, eliminating the need to inject lubricating grease and reducing the number of maintenance times. During processing, the graphite can be sintered into the through holes of the copper bushing.

[0046] See Figure 2 , optionally, the support assembly 41 includes a limit sleeve 411, and the inner cavity of the limit sleeve 411 is the above-mentioned installation cavity. A flange 412 protrudes outward from the bottom end of the limit sleeve 411, and the flange 412 is detachably connected to the base 12. By providing the flange 412 on the outer wall of the limit sleeve 411, the installation and fixation of the support assembly 41 and the base 12 can be facilitated. The detachable connection method between the flange 412 and the base 12 can facilitate the maintenance or replacement of the support assembly 41 and the elastic assembly 42.

[0047] Exemplarily, the flange 412 and the base 12 are connected by a plurality of fasteners. The plurality of fasteners are spaced apart circumferentially along the flange 412, and each fastener passes through the flange 412 and is threadedly connected to the base 12 to ensure the connection reliability and prevent loosening. The fasteners are preferably bolts.

[0048] See Figure 2 , a limit ring 413 protrudes from the inner wall of the limit sleeve 411. The lower end of the lead screw 2 passes through the ring opening of the limit ring 413 and extends into the limit hole 4211 (the inner cavity of the rigid bushing 421). The elastic assembly 42 is restricted between the limit ring 413 and the base 12. Specifically in this embodiment, both the elastic bushing 422 and the rigid bushing 421 are restricted between the limit ring 413 and the base 12 to prevent the two from disengaging from the installation cavity. As can be seen from Figure 2 , there is a gap between the outer wall of the lead screw 2 and the inner wall of the limit ring 413. This gap allows the lead screw 2 to have a certain space for self-adaptive displacement, avoiding restricting the lead screw 2 from offsetting in the same trend as the supporting assembly 3. At the same time, the ring wall of the limit ring 413 can play a limiting role to prevent excessive displacement of the lead screw 2.

[0049] In this embodiment, the limit sleeve 411, the flange 412 and the limit ring 413 are integrally formed, that is, the entire support assembly 41 is an integrally formed component, ensuring that it has sufficient strength.

[0050] Refer to Figure 1 , the support assembly 3 includes a lifting nut 31, a nut connecting seat 32 and an overhanging bracket 33. The lifting nut 31 is sleeved on the lead screw 2 and is threadedly connected to the lead screw 2. The overhanging bracket 33 is connected to the lifting nut 31 through the nut connecting seat 32, and the overhanging bracket 33 is used to support the mechanism to be lifted, such as a vehicle body to be repaired, etc. As Figure 1 shown, taking the vehicle body to be repaired as an example, the load on the overhanging bracket 33 is the gravity load F of the vehicle body to be repaired P , this gravity load F P causes the lifting nut 31 sleeved on the lead screw 2 to be subjected to a vertically downward pressure F and a clockwise bending moment M, thereby causing the axis of the lifting nut 31 to deflect. Due to the setting of the elastic support 4, the lead screw 2 can adaptively generate an axis offset in the same trend as the lifting nut 31, so as to effectively reduce the deflection amount of the axis of the lifting nut 31 relative to the axis of the lead screw 2, and further reduce the wear during the transmission of the lifting nut 31 and improve the transmission efficiency.

[0051] In this embodiment, the stiffness of the elastic bushing 422 is determined based on finite element calculation and analysis. After establishing the finite element model of this lifting mechanism, the deformation and displacement diagrams of the lead screw 2 in three states can be simulated: without support constraint at its lower end, with movable simply supported support constraint, and with elastic support 4 support constraint. Refer to Figure 3, where curve a represents the displacement curve of the screw 2 when there is no support constraint at the lower end of the screw 2. The displacement of the lowest end of the screw 2 is δ. Curve a shows that when the lifting operation is performed under the condition that the lower end of the screw 2 lacks support constraints, the dynamically changing load will cause excessive deflection of the axis of the lifting nut 31 and the axis of the screw 2, which will lead to instability of the transmission system and an uneven lifting process. Curve b represents the displacement curve of the screw 2 when the lower end of the screw 2 is constrained by a movable simple support. The movable simple support method provides a limiting force for the lower end of the screw 2 in the horizontal direction, and the lowest end of the screw 2 does not produce displacement, resulting in a large bending deformation of the screw 2 itself, which aggravates the deflection of the axis of the lifting nut 31 relative to the axis of the screw 2, and is prone to lifting creeping, jamming and other phenomena. Curve c represents the displacement curve of the screw 2 when the lower end of the screw 2 is supported and constrained by an elastic support 4. The displacement of the lower end of the screw 2 is reduced by γ relative to that without support constraint. At this time, the deflection angle of the axis of the lifting nut 31 relative to the vertical direction under the eccentric load is θ, and the deflection angle of the axis of the screw 2 and the lifting nut 31 relative to the vertical direction is also close to θ, that is, the deflection of the axis of the lifting nut 31 relative to the axis of the screw 2 is significantly reduced, which can reduce the wear of the lifting nut 31 and improve the transmission conditions. In the finite element model, the elastic support 4 is used to constrain the lower end of the screw 2, and after optimization, the maximum displacement value of the lower end of the screw 2 can be determined, and then the stiffness value of the elastic bushing 422 can be determined.

[0052] The present embodiment also provides a vehicle lifting machine, comprising the above-mentioned adaptive lifting mechanism, wherein the elastic support 4 can enable the screw 2 to adaptively produce an axial deviation in the same trend as the lifting nut 31 while providing a certain constraint for the lower end of the screw 2. The vehicle lifting machine can adapt to the dynamically changing vehicle body load during the process of lifting the vehicle body, maintain stable and reliable lifting movement, avoid lifting creeping, jamming and the like, and improve the operating performance of the vehicle lifting machine.

[0053] It can be understood that the adaptive lifting mechanism provided in this embodiment is not limited to use in vehicle lifting machines, but can also be used in other lifting equipment with unbalanced loads, and can improve transmission conditions and ensure a smooth lifting process.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An adaptive lifting mechanism, characterized in that, Comprising: An installation frame body (1), including a top plate (11) and a base (12) that are parallel and spaced apart; A lead screw (2), the upper end of the lead screw (2) is rotatably connected to the top plate (11); A supporting component (3), the supporting component (3) includes a lifting nut (31), the lifting nut (31) is sleeved on the lead screw (2) and is threadedly connected to the lead screw (2); An elastic support (4), connected to the base (12), a limiting hole (4211) is opened on the elastic support (4), the lower end of the lead screw (2) is rotatably inserted into the limiting hole (4211) and can move along the axial direction of the limiting hole (4211). When the supporting component (3) is unilaterally eccentrically loaded, the lower end of the lead screw (2) can move radially, and the lead screw (2) generates an axis offset in the same trend as the lifting nut (31); The elastic support (4) includes a support component (41) and an elastic component (42), the support component (41) is connected to the base (12), an installation cavity is opened on the support component (41), the elastic component (42) is arranged in the installation cavity, and the limiting hole (4211) is opened on the elastic component (42); The elastic component (42) includes a rigid bushing (421) and an elastic bushing (422), the outer wall of the elastic bushing (422) cooperates with the cavity wall of the installation cavity, the rigid bushing (421) is inserted into the elastic bushing (422), and the inner cavity of the rigid bushing (421) is the limiting hole (4211); The support component (41) includes a limiting sleeve (411), the inner cavity of the limiting sleeve (411) is the installation cavity, the bottom end of the limiting sleeve (411) protrudes outward to form a flange (412), and the flange (412) is detachably connected to the base (12); A limiting ring (413) protrudes from the inner wall of the limiting sleeve (411), the lower end of the lead screw (2) passes through the ring opening of the limiting ring (413) and extends into the limiting hole (4211), there is a gap between the outer wall of the lead screw (2) and the inner wall of the limiting ring (413), and the elastic component (42) is limited between the limiting ring (413) and the base (12).

2. The adaptive lifting mechanism according to claim 1, characterized in that The rigid bushing (421) includes a copper bushing, and a plurality of through holes are spaced apart on the side wall of the copper bushing, and a graphite structure is embedded in each through hole.

3. The adaptive lifting mechanism according to claim 1, wherein The elastic bushing (422) is a rubber bushing, and the rubber bushing is vulcanized to the cavity wall of the installation cavity.

4. The adaptive lifting mechanism according to claim 3, characterized in that, It also includes a plurality of fasteners, the plurality of fasteners are spaced apart along the circumference of the flange (412), and each fastener passes through the flange (412) and is threadedly connected to the base (12).

5. The adaptive lifting mechanism according to any one of claims 1-4, characterized in that, The supporting component (3) further includes a nut connecting seat (32) and an overhanging bracket (33). The lifting nut (31) is threadedly connected to the lead screw (2). The overhanging bracket (33) is connected to the lifting nut (31) through the nut connecting seat (32). The overhanging bracket (33) is configured to support the mechanism to be lifted.

6. A car lifting machine, characterized in that, It includes the adaptive lifting mechanism according to any one of claims 1-5.

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