Worm gear linear driving structure and worm gear linear driving module

Abstract

The utility model provides a worm gear linear driving structure and a worm gear linear driving module. The worm gear linear driving structure comprises an inner spiral tooth component, a rod piece, a plurality of worm gear sets and a pre-pressing piece set. The inner spiral tooth component is provided with an inner hole extending in the axial direction, and a spiral tooth structure is arranged on the inner circumferential face of the inner spiral tooth component. The rod piece is arranged in the inner hole in a penetrating mode and extends in the axial direction. The worm gear sets are arranged in the inner hole and arranged between the inner spiral tooth component and the rod piece. Each worm gear set comprises at least one worm gear, a tooth structure is arranged on the peripheral face of the worm gear, the tooth line of the tooth structure is meshed with the tooth line of the spiral tooth structure in a crossed mode, and the worm gear is in friction contact with the peripheral face of the rod piece. The pre-pressing piece set is arranged on the radial outer side of the worm wheel set and used for applying pre-pressing force to the worm wheel set, so that static friction force is formed between the worm wheel and the rod piece. When the inner spiral tooth component is driven to rotate, the worm gear can be driven to rotate, and the rod piece is pushed to move in the axial direction through the worm gear. When the rod piece bears reverse external force exceeding the static friction force, the rod piece slides relative to the worm gear set.

Description

TECHNICAL FIELD

[0001] The utility model relates to a drive structure, especially relate to a kind of worm gear and inner spiral tooth structure, realize the worm gear linear drive structure and worm gear linear drive module of rotation driving and linear motion conversion. BACKGROUND

[0002] Existing linear drive device, such as screw and cap mechanism, has been widely used in industrial automation, precision machinery and robot etc. field.But such structure in reverse driving ability, overload protection effect and stroke design flexibility, still there is technical limitation.

[0003] For example, screw mechanism when bearing reverse external force, limited to spiral angle and friction, if external force exceeds load limit, easy to cause thread damage, structure damage or motor reverse load problem.Due to the difficulty of screw thread process in cap and higher cost, the design of stroke length is also adversely affected.

[0004] Another part of linear drive device using friction wheel type structure.But such design is more simplified structure, generally lack perfect friction force adjustment and control mechanism, so that under normal driving or high load condition, it is easy to cause transmission failure or positioning bad due to insufficient friction, and also does not have effective overload protection function, difficult to meet the overload situation caused by reverse external force input.

[0005] Therefore, a new linear drive structure is needed, which can effectively solve the above problems, has reverse overload protection, stroke flexibility and manufacturing efficiency, to meet the needs of modern equipment for reliability, flexibility and application diversity. INVENTION CONTENTS

[0006] The utility model aims at providing a kind of worm gear linear drive structure and worm gear linear drive module.

[0007] To solve the above problems, the utility model provides a kind of worm gear linear drive structure, characterized by comprising:

[0008] An inner spiral tooth component has an inner hole extending along the axial direction, and the inner periphery of the inner hole is provided with a spiral tooth structure;

[0009] A rod is arranged in the inner hole and extends along the axial direction;

[0010] A plurality of worm gear sets are arranged in the inner hole and arranged between the inner spiral tooth component and the rod, each worm gear set comprises at least one worm gear, the outer periphery of the worm gear is provided with a tooth structure, the tooth line of the tooth structure is cross-engaged with the tooth line of the spiral tooth structure, and the outer periphery of each worm gear is in frictional contact with the outer periphery of the rod;And

[0011] A pre-pressing component set is arranged at the radial outer side of the worm gear sets to apply pre-pressing force to each worm gear set.

[0012] The worm gear linear driving structure further comprises:

[0013] A main bearing is arranged on the inner circumferential surface of at least one end of the inner helical tooth member;

[0014] A fixing frame is arranged at the axial outer side of the main bearing, and the fixing frame has a through inner hole; and

[0015] A sliding bushing is assembled in the inner hole of the fixing frame, and the sliding bushing has a through hole;

[0016] The rod member is further arranged in the through hole of the main bearing, the through inner hole of the fixing frame, and the through hole of the sliding bushing.

[0017] At least a part of the outer circumferential surface of the rod member has a smooth surface to be in frictional contact with each worm gear.

[0018] The rod member has a circular, elliptical, or polygonal geometric cross section.

[0019] Each worm gear set further comprises:

[0020] A retaining member has a body and two pairs of end portions extending from both sides of the body, each end portion is provided with a through hole, and each pair of end portions forms a spacing space, and each worm gear is arranged in the spacing space;

[0021] At least one worm gear shaft is arranged in the through hole of the retaining member and penetrates through the corresponding worm gear; and

[0022] At least two worm gear bearings are respectively arranged in the inner hole of the worm gear and are sleeved on the worm gear shaft.

[0023] The outer circumferential surface of each worm gear forms a concave profile, and the shape of the concave profile corresponds to the outer circumferential profile of the rod member.

[0024] The pre-pressing component set comprises a plurality of torsion sheets, and each torsion sheet is provided with a hook portion.

[0025] The plurality of torsion sheets are stacked into torsion sheet sets, each torsion sheet set is arranged on two adjacent retaining members, and the hook portion is clamped at the radial outer side of the two retaining members to apply pre-pressing force to the two retaining members.

[0026] A worm gear linear driving module comprises:

[0027] A worm gear linear drive structure as claimed in claim 1;

[0028] A housing defining a receiving space, the worm gear linear drive structure being disposed in the receiving space;

[0029] A stator fixedly disposed in the housing and surrounding the outer side of the inner helical tooth member for driving the inner helical tooth member to rotate; and

[0030] A flange cover fixedly disposed at one end of the housing.

[0031] A worm gear linear drive module, characterized in that it comprises:

[0032] A worm gear linear drive structure as claimed in claim 1;

[0033] A housing defining a receiving space, the worm gear linear drive structure being disposed in the receiving space;

[0034] A stator fixedly disposed in the housing;

[0035] A rotor disposed in the space surrounded by the stator and capable of rotating relative to the stator;

[0036] A rotor structure, one end of the rotor structure being combined with the rotor and the other end of the rotor structure being combined with the inner helical tooth member; and

[0037] An end cover fixedly disposed at one end of the housing.

[0038] When the inner helical tooth member is driven to rotate, the helical tooth structure thereof is cross-engaged with the tooth structure of the worm gear, so that the worm gear is driven to rotate synchronously, and the rotational torque is converted into the axial linear movement of the rod member by the frictional contact between the worm gear and the outer circumferential surface of the rod member. In addition, if the rod member is subjected to an inverse external force and the external force exceeds the static friction force set by the pre-pressing member set, the rod member will slip relative to the worm gear, thereby blocking the transmission of the excessive reaction force, avoiding damage to the worm gear, the inner helical tooth member or other driving components due to overloading, and improving the durability and operation safety of the overall driving structure. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1A It is an exploded view of the main components of the worm gear linear drive structure of the first embodiment of the present application.

[0040] Figure 1B It is an exploded view of the worm gear set and the pre-pressing member set components of the worm gear linear drive structure of the first embodiment of the present application.

[0041] Figure 2A It is a cross-sectional view of the worm gear linear drive structure of the first embodiment of the present application in an assembled state.

[0042] Figure 2B The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model.

[0043] Figure 3A The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model. Figure 2B The cross-sectional schematic view along B-B.

[0044] Figure 3B The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model. Figure 2B The cross-sectional schematic view along A-A.

[0045] Figure 4A The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model under the state that the rod piece is subjected to reverse external force input.

[0046] Figure 4B The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model under the state that the rod piece is subjected to reverse external force input.

[0047] Figure 5 The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model under the state that the rod piece is subjected to reverse external force input.

[0048] Figure 6 The cross-sectional structure schematic view of the worm gear linear drive structure of the first embodiment of the utility model under the state that the rod piece is subjected to reverse external force input.

[0049] BRIEF DESCRIPTION OF DRAWINGS Worm gear linear drive structure 1; Inner spiral tooth component 10; Inner hole 100; Spiral tooth structure 100t; Rod piece 20; Smooth surface 20s; Worm gear set 30; Retaining piece 301; Body 301b; End 301e; Through hole 301h; Interval space 301p; Worm gear 302; Tooth structure 302t; Concave portion contour 302c; Inner hole 302h; Worm gear shaft 303; Worm gear bearing 304; Pre-press piece set 40; Torsion sheet 401; Hook portion 402; Torsion sheet set 401g; Main bearing 50; Fixed frame 60; Inner hole 60h; Sliding bushing 70; Through hole 70h; Worm gear linear drive module 2, 3; Shell 80, 80'; Through hole 80h, 80h', 83h, 92h; Accommodation space AS, AS'; Stator 81, 81'; Flange cover 83; Rotor 90; Rotor structure 91; End cover 92; External force F. DETAILED DESCRIPTION

[0050] The structure and functional characteristics of the worm gear linear drive structure and module of the utility model will be described according to the preferred embodiments of the accompanying drawings.

[0051] Please refer to Figure 1A , Figure 1B , Figure 2A and Figure 2BThe utility model discloses a worm gear linear drive structure 1, including: one inner helical tooth component 10, a bar 20, plurality of worm gear groups 30 and one pre -compression spare group 40, the structure and configuration relation of each component will be explained in order below.

[0052] As Figure 1A , Figure 2A and Figure 2B The inner helical tooth component 10 is in the structure of cylinder (hollow cylinder), and defines the inner hole 100 extending along the axial direction. The inner peripheral surface of the inner helical tooth component 10 is provided with the helical tooth structure 100t.

[0053] The bar 20 is arranged in the inner hole 100 of the inner helical tooth component 10 and extends along the axial direction. The bar 20 can adopt circular, oval, square or polygonal geometric section according to design requirements.

[0054] As Figure 2B The outer peripheral surface of the bar 20 is provided with a smooth surface 20s in at least part of the region.

[0055] As Figure 2A and Figure 2B The plurality of worm gear groups 30 are arranged in the inner hole 100 of the inner helical tooth component 10 and are arranged between the inner helical tooth component 10 and the bar 20.

[0056] As Figure 1B Each worm gear group 30 comprises a retaining member 301, at least one worm gear 302, at least one worm gear shaft 303 and at least two worm gear bearings 304. This embodiment takes three worm gear groups 30 as an example, each worm gear group 30 comprises two worm gears 302, two worm gear shafts 303 and four worm gear bearings 304.

[0057] The retaining member 301 has a body 301b and two pairs of end portions 301e extending from both sides of the body 301b, each end portion 301e is provided with a through hole 301h, and the interval space 301p is defined between the opposite end portions 301e. Two worm gears 302 are arranged in the interval space 301p corresponding to the two opposite end portions 301e respectively.

[0058] As Figure 1B The worm gear 302 is in the structure of cylinder, and the outer peripheral surface is provided with the tooth structure 302t.

[0059] As Figure 1B and Figure 2AAs shown, the outer peripheral surface of the worm gear 302 is further formed with a concave profile 302c, the shape of which corresponds to the outer peripheral profile of the rod 20, thereby enabling close contact with the rod 20. In this embodiment, the tooth structure 302t of the worm gear 302 is composed of two rows of racks arranged circumferentially, and the concave profile 302c is formed between the two rows of racks.

[0060] like Figure 1B As shown, the worm gear bearing 304 is disposed within the inner hole 302h of the worm gear 302, while the worm gear shaft 303 is sequentially disposed within the retaining member through hole 301h, the worm gear bearing 304, and the worm gear 302. The combination of the worm gear shaft 303 and the worm gear bearing 304 provides stable support and positioning for the worm gear 302, ensuring its stable rotation during operation.

[0061] Please see Figure 1B , Figure 2B , Figure 3A and Figure 3B As shown. Figure 1B , Figure 3A and Figure 3B As shown, each preload assembly 40 is positioned radially outward from the three sets of worm gear assemblies 30, and is respectively disposed between two adjacent retainers 301 to apply preload to each worm gear assembly 30. Thereby, the radial preload applied to the retainers 301 by the preload assembly 40 causes each worm gear 302 to be pressed tightly towards the rod 20, thereby forming a stable and controllable static friction force between the worm gear 302 and the rod 20.

[0062] In this embodiment, three sets of pre-compression components 40, each of which contains a plurality of torque plates 401, are used as an example for illustration.

[0063] like Figure 1B As shown, each preload assembly 40 includes a plurality of torque plates 401, each torque plate 401 being generally plate-shaped and having a hook portion 402. For example... Figure 1B and Figure 3A As shown, the torsion plates 401 are stacked in groups to form multiple torsion plate groups 401g. Each torsion plate group 401g is disposed between two pairs of ends on the corresponding two retainers 301 and is secured to the radial outer side of the two retainers 301 by the hooks 402 to apply preload to the retainers 301.

[0064] like Figure 3A and Figure 3B As shown, each worm gear assembly 30 can withstand radial preload by the preload applied by each torsion plate assembly 401g. This preload is then transmitted to the worm gear 302, causing the worm gear 302 to press tightly against the rod 20, thereby forming a stable static friction contact between the worm gear 302 and the rod 20, ensuring that the power of the internal helical gear component 10 when rotating can be smoothly transmitted to the rod 20.

[0065] In addition, by selecting torsion sheets 401 with different elastic coefficients or different numbers of stacked torsion sheets 401, the pre-pressing force can be adjusted, and thus the strength of the static friction between the worm gears 302 and the rod members 20 can be controlled to meet different driving requirements.

[0066] Furthermore, to make the adjustment of the friction more flexible and fine, the present embodiment can adjust the friction between the worm gears 302 and the rod members 20 in the following ways:

[0067] First, by adjusting the interference amount of the torsion sheets 401 (for example, selecting torsion sheets with different thicknesses or adjusting the compression degree during assembly), the pre-pressing force applied by the pre-pressing member set 40 to the worm gears 302 can be changed, thereby indirectly changing the friction between the worm gears 302 and the rod members 20.

[0068] Furthermore, the surface of the rod member 20 can also be treated, such as applying a coating, changing the material, or adjusting the surface roughness, to change the friction coefficient of the surface of the rod member 20, thereby adjusting the static friction between the worm gears 302 and the rod members 20.

[0069] The design of the pre-pressing member set 40 of the present utility model is not limited to the torsion sheets 401 disclosed above, and other elastic members with similar functions can also be used, such as ring-shaped or other shaped elastic members. As long as the elastic members can apply appropriate pre-pressing force to each worm gear set 30 to establish static friction between the worm gears 302 and the rod members 20, they are all feasible implementation manners of the present utility model.

[0070] As shown in FIGS. Figure 1A and Figure 2B The worm linear drive structure 1 further includes at least one main bearing 50, at least one fixed frame 60, and at least one sliding bushing 70. The present embodiment takes two main bearings 50, two fixed frames 60, and two sliding bushings 70 as an example for illustration.

[0071] The two main bearings 50 are respectively arranged on the inner circumferential surfaces of the two opposite end portions of the inner helical tooth member 10, and can provide the radial support required for the rotation of the inner helical tooth member 10.

[0072] The two fixed frames 60 are respectively arranged on the axial outer sides of the two main bearings 50, one end portion of each fixed frame 60 can be inserted into the through hole of the main bearing 50, and the outer diameter of the end portion matches the inner diameter of the through hole of the main bearing 50, thereby forming a fitting positioning relationship. The fixed frame 60 is provided with a through inner hole 60h, and the inner hole 60h has multiple sections, wherein the larger diameter section is used to assemble the sliding bushing 70, and the smaller diameter section is used to pass the rod member 20.

[0073] Two sliding bushings 70 are respectively assembled in the larger diameter section of the inner hole 60h of the two fixed frames 60, and each sliding bushing 70 is provided with a through hole 70h, the inner diameter of which matches the outer diameter of the rod member 20, so that the rod member 20 can be passed through and provide radial guidance and positioning effect during operation, ensuring the stability and coaxial accuracy of the movement of the rod member 20.

[0074] As shown in Figure 2B , when the inner helical tooth member 10 is driven to rotate, the helical tooth structure 100t provided on the inner periphery thereof is in cross engagement with the outer peripheral tooth structure 302t of the worm wheel 302, so as to synchronously drive the worm wheel 302 to rotate. During the rotation of the worm wheel 302, the rotational torque is effectively converted into thrust by the frictional contact between the worm wheel 302 and the rod member 20, so as to push the rod member 20 to move linearly along the axial direction.

[0075] As shown in Figure 3A and Figure 3B , the worm wheels 302 of the three groups of worm wheel sets 30 are distributed in the circumferential direction along the outer periphery of the rod member 20, and are stably and tightly attached to the outer periphery of the rod member 20 under the action of the radial pre-pressing force applied by the pre-pressing member set 40.

[0076] As shown in Figure 3B , the shape of the recessed profile 302c of the outer periphery of each worm wheel 302 corresponds to the outer peripheral profile of the rod member 20, so that the worm wheel 302 can form more closely and stably frictional contact with the rod member 20 when rotating.

[0077] As shown in Figure 4A and Figure 4B , when the rod member 20 is driven in the reverse direction due to external force F, if the external force F exceeds the static frictional force that can be formed between the rod member 20 and the worm wheel 302 by frictional contact, the relative sliding (slip) phenomenon will occur between the smooth surface 20s of the rod member 20 and the worm wheel 302.

[0078] In this embodiment, the worm linear drive structure is composed of an inner helical tooth component, a plurality of worm gears and a rod, and is assisted by a pre-pressing component group to apply a pre-pressing force to the worm gear group to form a static friction force between the worm gear and the rod. When the inner helical tooth component is driven to rotate, the helical tooth structure thereof and the tooth structure of the worm gear produce cross meshing action to drive the worm gear to rotate synchronously. When the worm gear rotates, the friction contact formed between the recess profile provided on the outer circumferential surface thereof and the outer circumferential profile of the rod converts the rotary torque into thrust to push the rod to move linearly in the axial direction. In addition, when the rod is subjected to a reverse external force and the static friction force formed between the worm gear and the rod is exceeded, the rod can slide (slip) relative to the worm gear, thereby playing an overload protection function. By this design, excessive reaction force can be prevented from being directly transmitted to the worm gear, the inner helical tooth component and other driving components, thereby avoiding damage to the components due to bearing excessive load and improving the durability and operation safety of the overall driving system.

[0079] Referring to Figure 5 The second embodiment of the utility model provides a worm linear drive module 2, which is based on the worm linear drive structure 1 and further combines a rotary drive mechanism and a module packaging structure.

[0080] The worm linear drive module 2 comprises the worm linear drive structure 1, a housing 80, a stator 81 and a flange cover 83.

[0081] The housing 80 defines a receiving space AS, and the worm linear drive structure 1 is arranged in the receiving space AS.

[0082] The stator 81 is a ring-shaped structure and is fixedly arranged in the housing 80 and annularly arranged on the outer circumferential surface of the inner helical tooth component 10. The stator 81 can comprise an electromagnetic coil assembly (not shown in the figure), which generates a magnetic field after being energized to drive the inner helical tooth component 10 to rotate.

[0083] The flange cover 83 is mounted on one end of the housing 80 to close the receiving space AS. The housing 80 and the flange cover 83 can be respectively provided with through holes 80h and 83h, so that the rod 20 can pass through the through holes and extend in the axial direction to the outside of the worm linear drive module 2.

[0084] This embodiment is based on the architecture of the first embodiment and adds components such as a housing, a stator and a flange cover to form a module. The stator is annularly arranged on the outer side of the inner helical tooth component, generates a magnetic field after being energized to drive the inner helical tooth component to rotate, and generates linear motion of the rod through the friction transmission mechanism of the worm and the rod.

[0085] Referring to Figure 6The utility model discloses third embodiment provides a worm linear drive module 3, this worm linear drive module 3 with the worm linear drive module 2 of second embodiment is similar, the main difference is that this embodiment is by another rotor 90 and rotor structure 91 drive inner helical tooth component 10 rotation.

[0086] The worm linear drive module 3 includes the aforementioned worm linear drive structure 1, a housing 80', a stator 81', a rotor 90, a rotor structure 91 and an end cover 92.

[0087] The housing 80' defines a receiving space AS', and the aforementioned worm linear drive structure 1 is arranged in the receiving space AS'.

[0088] The stator 81' is a surrounding structure and is fixedly arranged inside the housing 80'. The stator 81' can include an electromagnetic coil assembly (not shown in the figure), which can generate a magnetic field after being powered on.

[0089] The rotor 90 is arranged in the space surrounded by the stator 81' and can rotate relative to the stator 81'. The rotor 90 is a ring structure and is fixedly combined with one end of the rotor structure 91, forming an integrated rotating relationship.

[0090] The rotor structure 91 has a multi-section stepped shape, one end of which is embedded and fixed with the rotor 90, and the other end is inserted into the end of the inner helical tooth component 10, so that the rotor structure 91 can be stably combined with the inner helical tooth component 10. In addition, the rotor structure 91 is provided with a through hole, the inner diameter of the through hole matches the outer diameter of the rod 20, and the rod 20 is allowed to pass through the through hole.

[0091] When the rotor 90 is driven to rotate, the rotor structure 91 fixedly combined with the rotor 90 is also driven to rotate synchronously, and the inner helical tooth component 10 is also rotated through the combined relationship between the rotor structure 91 and the inner helical tooth component 10. The inner helical tooth component 10 further drives the worm wheel 302 to rotate through the cross meshing relationship between the inner helical tooth component 10 and the worm wheel 302, and the rotating worm wheel 302 pushes the rod 20 to move along the axial direction through the frictional contact between the outer circumferential surface of the worm wheel 302 and the rod 20, realizing the power transmission and linear driving function.

[0092] The end cover 92 is fixedly arranged at one end of the housing 80' and is used for closing the receiving space AS'. The housing 80' and the end cover 92 can be respectively provided with through holes 80h' and 92h, so that the rod 20 can pass through the through holes 80h' and 92h and extend along the axial direction to the outside of the worm linear drive module 3.

[0093] In this embodiment, the rotor and the rotor structure are designed to drive the inner helical tooth component, and the rotational motion is converted into the linear movement of the rod through the friction transmission mechanism between the worm wheel and the rod, thereby providing another modular design.

[0094] In summary, the worm gear linear drive structure and the worm gear linear drive module disclosed by each embodiment of the utility model, through the cross meshing design between the inner helical tooth component and the worm gear, cooperate the friction transmission mechanism between the worm gear and the rod component generated by the pre-pressure provided by the pre-pressure piece group, can efficiently and stably convert the rotary torque into the linear movement of the rod component, and can automatically slip when the rod component is subjected to abnormal load, preventing structural overload damage. Further, the second embodiment and the third embodiment further integrate the stator or the rotor driving mechanism directly in the housing, forming a modular structure, which not only helps to improve the system compactness, but also provides diversified application flexibility according to different application requirements.

[0095] The above has made a detailed description of the utility model, and the above is only a preferred embodiment of the utility model, and should not limit the range of the utility model implementation. That is, any equivalent changes and modifications made according to the utility model should still belong to the patent coverage of the utility model.

Claims

1. A worm gear linear drive structure, characterized in that, Include: An internal helical tooth component has an axially extending inner hole, the inner circumferential surface of which is provided with a helical tooth structure. A rod is inserted into the inner hole and extends axially. A plurality of worm gear sets are disposed within the inner bore and positioned between the inner helical gear member and the rod. Each worm gear set includes at least one worm wheel, the outer circumferential surface of which is provided with a tooth structure. The tooth line of the tooth structure intersects and meshes with the tooth line of the helical gear structure, and the outer circumferential surface of each worm wheel is in frictional contact with the outer circumferential surface of the rod. A preload assembly is disposed radially outside the plurality of worm gear sets to apply preload to each of the worm gear sets.

2. The worm gear linear drive structure as described in claim 1, characterized in that, Also includes: A main bearing is disposed on the inner circumferential surface of at least one end of the internal helical gear member; A mounting bracket, disposed on an axially outer side of the main bearing, the mounting bracket having a through inner hole; and A sliding bushing is assembled in the inner hole of the fixed frame, and the sliding bushing has a through hole; The rod is also inserted through the inner hole of the main bearing, the fixed frame, and the through hole of the sliding bushing.

3. The worm gear linear drive structure as described in claim 1, characterized in that, At least a portion of the outer peripheral surface of the rod has a smooth surface for frictional contact with each of the worm gears.

4. The worm gear linear drive structure as described in claim 1, characterized in that, The member has a circular, elliptical, or polygonal geometric cross-section.

5. The worm gear linear drive structure as described in claim 1, characterized in that, Each of these worm gear sets also includes: A retainer has a body and two pairs of ends extending from both sides of the body, each end having a through hole, and a space between the pairs of ends, with each worm gear disposed in the space. At least one worm gear shaft passes through the through hole of the retainer and through the corresponding worm gear; and At least two worm gear bearings are respectively disposed in the inner hole of the worm gear and sleeved on the worm gear shaft.

6. The worm gear linear drive structure as described in claim 1, characterized in that, Each worm gear has a concave profile on its outer peripheral surface, the shape of which corresponds to the outer peripheral profile of the rod.

7. The worm gear linear drive structure as described in claim 1, characterized in that, The preload assembly includes a plurality of torque plates, each of which has a hook.

8. The worm gear linear drive structure as described in claim 7, characterized in that, The plurality of torsion plates are stacked to form a torsion plate group, and each torsion plate group is disposed on two adjacent retainers and is engaged with the radial outer side of the two retainers by the hook to apply preload to the two retainers.

9. A worm gear linear drive module, characterized in that, Include: A worm gear linear drive structure as described in claim 2; A housing defines an accommodating space in which the worm gear linear drive structure is disposed; A stabilizer is fixedly disposed within the housing and arranged around the outer side of the inner helical gear member to drive the inner helical gear member to rotate; and A flange cover is fixedly installed at one end of the housing.

10. A worm gear linear drive module, characterized in that, Include: A worm gear linear drive structure as described in claim 2; A housing defines an accommodating space in which the worm gear linear drive structure is disposed; A quantum unit is fixedly installed inside the housing. A rotor is disposed in the space surrounded by the stator and is rotatable relative to the stator; A rotor structure, one end of which is coupled to the rotor, and the other end of which is coupled to the internal helical tooth member; and One end cap is fixedly installed at one end of the housing.

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