Annular envelope worm helical gear transmission mechanism

Abstract

The present invention discloses an annular envelope worm helical gear transmission mechanism, comprising a housing having a first cavity and a second cavity interconnected therein; a helical gear rotatably disposed within the first cavity; a protective column rotatably disposed within the second cavity, the protective column being provided with a placement cavity and an escape opening connecting the first cavity and the second cavity, the axis of the protective column being parallel to the axis of the placement cavity and spaced apart, the protective column being provided with a limiting mechanism connecting the protective column and the housing to limit lateral movement of the protective column; and an annular envelope worm rotatably disposed within the placement cavity, the axis of the annular envelope worm being colinear with the axis of the placement cavity, the annular envelope worm being at least partially exposed in the escape opening to engage with the helical gear, the rotation of the protective column causing the annular envelope worm to move along the circumferential direction of the protective column to approach or move away from the helical gear. The technical solution provided by the present invention reduces the gap between the helical gear and the annular envelope worm.

Description

Technical Field

[0001] The present invention relates to the technical field of robots, and in particular to an annular surface enveloping worm helical gear transmission mechanism. Background Art

[0002] The annular enveloping worm helical gear transmission is a common mechanical transmission device used to transmit motion and power between two staggered shafts. It is often used in situations with large transmission ratios, low transmission power, or intermittent operation. The helical gear and the annular enveloping worm are equivalent to a gear and rack in their intermediate plane, and the annular enveloping worm is similar in shape to a screw. The annular enveloping worm helical gear transmission usually has an intersecting angle of 90° between the two shafts, and the annular enveloping worm is generally the active component. During operation, the helical gear teeth slide and roll along the spiral surface of the annular enveloping worm. In traditional annular enveloping worm helical gear transmissions, the center distance between the helical gear and the annular enveloping worm is relatively fixed. This design mainly relies on machining accuracy to ensure clearance.

[0003] However, during use, due to assembly and dimensional deviations, gaps are likely to appear in the existing annular envelope worm helical gear transmission mechanism, affecting transmission accuracy and stability. Summary of the Invention

[0004] The main purpose of the present invention is to provide an annular envelope worm helical gear transmission mechanism, aiming to reduce the gap between the helical gear and the annular envelope worm in the annular envelope worm helical gear transmission mechanism.

[0005] To achieve the above-mentioned purpose, the present invention proposes an annular surface enveloping worm helical gear transmission mechanism, comprising:

[0006] The housing has a first cavity and a second cavity connected thereto;

[0007] a helical gear rotatably disposed in the first cavity;

[0008] a protective column rotatably disposed in the second cavity, the protective column being provided with a placement cavity and an escape opening connecting the first cavity and the second cavity, the axis of the protective column being parallel to the axis of the placement cavity and spaced apart, the protective column being provided with a limiting mechanism connecting the protective column and the housing to limit lateral movement of the protective column; and

[0009] An annular envelope worm is rotatably arranged in the placement cavity, the axis of the annular envelope worm is colinear with the axis of the placement cavity, and the annular envelope worm is at least partially exposed in the avoidance opening to engage with the helical gear. The rotation of the protective column causes the annular envelope worm to move along the circumferential direction of the protective column to approach or move away from the helical gear.

[0010] In one embodiment, the limiting mechanism includes a limiting rib and a limiting groove provided in the second cavity, one end of the limiting rib is connected to the protective column, and the other end extends to the limiting groove, the protective column includes a first shaft sleeve and a second shaft sleeve which are separately arranged, the first shaft sleeve is rotatably connected to one end of the annular surface enveloping worm, and the second shaft sleeve is rotatably connected to the other end of the annular surface enveloping worm, a first limiting portion is provided on the first shaft sleeve, and a second limiting portion is provided on the second shaft sleeve, the second limiting portion is fixedly connected to the first limiting portion so that the first shaft sleeve rotates with the second shaft sleeve, and the first limiting portion and the second limiting portion form the limiting rib, and the limiting rib cooperates with the limiting groove to realize the positioning of the first shaft sleeve and the second shaft sleeve.

[0011] In one embodiment, the first sleeve includes a first sleeve body, a first protrusion connected to the first sleeve body, and a second protrusion connected to the first protrusion, which are sequentially arranged, and the first protrusion and the second protrusion form the first limiting portion;

[0012] The second sleeve includes a second sleeve body, a third convex portion provided on the second sleeve body, and a concave portion provided on the third convex portion, wherein the third convex portion and the concave portion form the second limiting portion;

[0013] Wherein, the first convex portion cooperates with the third convex portion, and the second convex portion cooperates with the concave portion.

[0014] In one embodiment, one end of the shell is provided with a accommodating cavity connected to the second cavity, and the second sleeve also includes a fourth protrusion provided on the second sleeve body, and the fourth protrusion and the third protrusion are provided on opposite sides of the second sleeve body, and the fourth protrusion cooperates with the accommodating cavity to achieve the positioning of the second sleeve.

[0015] In one embodiment, the fourth protrusion is provided with a threaded hole, and the annular surface enveloping worm helical gear transmission mechanism further includes a brushless motor, the brushless motor is threadedly connected to the threaded hole, and the brushless motor is drivingly connected to the annular surface enveloping worm to drive the annular surface enveloping worm to rotate.

[0016] In one embodiment, the brushless motor includes a motor body, an output shaft connected to the motor body, and a threaded column sleeved on the output shaft, the output shaft is drivingly connected to the annular surface enveloping worm, and the threaded column is threadedly connected to the threaded hole.

[0017] In one embodiment, the annular surface enveloping worm helical gear transmission mechanism also includes a gear shaft, an output hole connected to the first cavity is provided on the shell, and the gear shaft is rotatably arranged in the output hole. One end of the gear shaft is fixedly connected to the helical gear, and the other end is exposed to the outside of the shell and is provided with an output position.

[0018] In one embodiment, a bearing is provided in the output hole, the bearing has an inner ring and an outer ring, and the gear shaft passes through the inner ring.

[0019] In one embodiment, the annular surface enveloping worm helical gear transmission mechanism further includes a sealing ring disposed in the output hole, and the gear shaft passes through the sealing ring.

[0020] In one embodiment, the housing includes a first housing and a second housing, and the first housing is fixedly connected to the second housing by bolts.

[0021] In the technical solution provided by the present invention, a housing is provided to provide integral support for the annular envelope worm helical gear transmission mechanism. The housing has a first and second interconnected cavity, within which the helical gear and the annular envelope worm can be placed. The helical gear is the passive component of the annular envelope worm helical gear transmission mechanism, while the annular envelope worm is the active component of the transmission mechanism. Motion transmission is achieved through the meshing of the annular envelope worm and the helical gear. In this embodiment, a protective column is provided, and the annular envelope worm is mounted within the housing cavity of the protective column. By driving the protective column to rotate, the annular envelope worm can be moved along the circumferential direction of the protective column, thereby approaching the helical gear to reduce the gap. It is understood that because the axis of the protective column and the axis of the placement cavity are parallel and spaced apart, when the protective column rotates, the placement cavity within it also rotates. Since the placement cavity and the axis of the annular envelope worm are collinear, the position of the annular envelope worm within the placement cavity does not change. However, the rotation of the protective column does change the position of the annular envelope worm relative to the helical gear, thereby reducing the gap between the helical gear and the annular envelope worm. Furthermore, a limit mechanism is provided on the protective column, connecting the protective column and the housing, which can limit the lateral movement of the protective column, ensuring that the protective column can only rotate axially, thereby improving the accuracy and stability of the transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of the annular envelope worm helical gear transmission mechanism provided by the present invention;

[0024] Figure 2 A schematic cross-sectional view of an embodiment of an annular envelope worm helical gear transmission mechanism provided by the present invention;

[0025] Figure 3 A schematic structural diagram of an embodiment of a protective column provided by the present invention from another perspective;

[0026] Figure 4 A schematic diagram of the explosion structure of an embodiment of the protective column provided by the present invention;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of an embodiment of the brushless motor provided by the present invention.

[0028] Description of Figure Numbers:

[0029] 10. Housing; 11. First housing; 12. Second housing; 20. Bevel gear; 30. Protective column; 31. First sleeve; 311. First sleeve body; 312. First convex portion; 313. Second convex portion; 32. Second sleeve; 321. Second sleeve body; 322. Third convex portion; 323. Concave portion; 324. Fourth convex portion; 33. Limiting mechanism; 331. Limiting rib; 332. Limiting groove; 40. Annular envelope worm; 50. Brushless motor; 51. Motor body; 52. Output shaft; 53. Threaded column; 60. Gear shaft; 70. Bearing; 80. Sealing ring.

[0030] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiment is only an embodiment of a component of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] In an annular envelope worm helical gear transmission, the helical gear teeth slide and roll along the helical surface of the annular envelope worm during operation. Due to assembly and dimensional deviations, existing annular envelope worm helical gear transmissions are prone to backlash, which affects transmission accuracy and stability. Excessive backlash can lead to reduced transmission accuracy, increased positioning errors, and decreased transmission efficiency. This not only increases energy consumption but can also affect the long-term operational efficiency of the equipment.

[0035] In view of this, an embodiment of the present invention provides a ring-enveloping worm helical gear transmission mechanism, which is provided with a protective column with an eccentric placement cavity, so that the protective column is rotatably connected to the shell. Since the axis of the ring-enveloping worm and the axis of the protective column are spaced apart, when the protective column is driven to rotate around its own axis, the ring-enveloping worm can be driven to move toward the direction of the helical gear, so that the helical gear and the ring-enveloping worm are tightly fitted.

[0036] In order to better understand the above technical solution, the above technical solution is described in detail below with reference to the accompanying drawings.

[0037] like Figure 1 、 Figure 2 、 Figure 3 As shown, the present invention provides a ring-surface enveloping worm helical gear transmission mechanism, comprising:

[0038] The housing 10 has a first cavity and a second cavity connected thereto;

[0039] The bevel gear 20 is rotatably disposed in the first cavity;

[0040] A protective column 30 is rotatably disposed in the second cavity. The protective column 30 is provided with a placement cavity and an escape opening connecting the first cavity and the second cavity. The axis of the protective column 30 is parallel to the axis of the placement cavity and is spaced apart. The protective column 30 is provided with a limiting mechanism 33 that connects the protective column 30 and the housing 10 to limit lateral movement of the protective column 30; and

[0041] The annular envelope worm 40 is rotatably arranged in the placement cavity, the axis of the annular envelope worm 40 and the axis of the placement cavity are colinear, and the annular envelope worm 40 is at least partially exposed in the avoidance opening to engage with the helical gear 20. The protection column 30 rotates so that the annular envelope worm 40 moves along the circumferential direction of the protection column 30 to approach or move away from the helical gear 20.

[0042] In the technical solution adopted in this embodiment, a housing 10 is provided to provide integral support for the annular enveloping worm helical gear transmission mechanism. Housing 10 has a first and second interconnected cavity, within which the helical gear 20 and the annular enveloping worm 40 are positioned. The helical gear 20 is the passive component of the annular enveloping worm helical gear transmission mechanism, while the annular enveloping worm 40 is the active component. Motion transmission is achieved through the meshing of the annular enveloping worm 40 with the helical gear 20. In this embodiment, a protective column 30 is provided, and the annular enveloping worm 40 is mounted within the housing cavity of the protective column 30. By driving the protective column 30 to rotate, the annular enveloping worm 40 can be moved along the circumferential direction of the protective column 30, thereby approaching the helical gear 20 to reduce clearance. It will be appreciated that, because the axis of the protective cylinder 30 and the axis of the placement cavity are parallel and spaced apart, when the protective cylinder 30 rotates, the placement cavity therein also rotates. Since the placement cavity and the axis of the annular envelope worm 40 are collinear, the position of the annular envelope worm 40 within the placement cavity does not change. However, the rotation of the protective cylinder 30 changes the position of the annular envelope worm 40 relative to the helical gear 20, thereby reducing the gap between the helical gear 20 and the annular envelope worm 40. Furthermore, a limiting mechanism 33 is provided on the protective cylinder 30. The limiting mechanism 33 connects the protective cylinder 30 to the housing 10 and abuts against it, thereby limiting the lateral movement of the protective cylinder 30, ensuring that the protective cylinder 30 can only rotate axially, thereby improving the accuracy and stability of the transmission.

[0043] Specifically, the annular surface enveloping worm helical gear transmission mechanism includes a housing 10 , a helical gear 20 , a protective column 30 and an annular surface enveloping worm 40 .

[0044] The housing 10 is generally made of metal and has sufficient strength and rigidity to ensure the stability and durability of the annular surface enveloping worm helical gear transmission mechanism. The first cavity is used to accommodate the helical gear 20, and the second cavity is used to accommodate the protective column 30 and the annular surface enveloping worm 40.

[0045] Helical gear 20 is typically made of a wear-resistant material to reduce wear. Helical gear 20 is rotatably disposed within the first cavity and can mesh with the annular envelope worm 40 to achieve a transmission effect. It should be noted that the tooth profile of the annular envelope worm 40 must match that of the helical gear 20 to ensure a good meshing effect.

[0046] The guard cylinder 30 is used to adjust the position of the annular envelope worm 40, thereby adjusting the gap between the helical gear 20 and the annular envelope worm 40. The guard cylinder 30 is disposed within the second cavity and includes a placement chamber within which the annular envelope worm 40 can be placed. Furthermore, the axis of the guard cylinder 30 and the placement chamber are parallel and spaced apart, and the axis of the annular envelope worm 40 is collinear with the axis of the placement chamber. This allows the guard cylinder 30 to rotate, changing the relative position of the annular envelope worm 40 and the helical gear 20. By adjusting the rotation angle of the guard cylinder 30, the gap between the annular envelope worm 40 and the helical gear 20 can be controlled. It is understood that a greater rotation angle results in a smaller gap between the helical gear 20 and the annular envelope worm 40, while a smaller rotation angle results in a larger gap between the helical gear 20 and the annular envelope worm 40. By providing a relief opening connecting the first cavity and the second cavity on the protective cylinder 30, with the relief opening being larger than the rotational length of the protective cylinder 30, the annular envelope worm 40 can be at least partially exposed for engagement with the helical gear 20. The protective cylinder 30 can be a one-piece structure to improve adjustment accuracy, or a split structure to facilitate installation of the annular envelope worm 40 within the housing cavity of the protective cylinder 30. The rotation of the protective cylinder 30 can be driven by an external motor or manually, without limitation. The limiting mechanism 33 can be one or more limiting blocks fixed on the protective column 30, and cooperate with the inner wall of the shell 10 or a specific limiting groove. The inner wall of the shell 10 can be provided with a limiting groove matching the limiting block. The limiting groove is provided with a circle along the rotation direction of the protective column 30. One end of the limiting mechanism 33 is connected to the protective column 30, and the other end is arranged in the limiting groove. The limiting groove has two groove walls arranged opposite to each other along the axial direction of the protective column 30. The limiting mechanism 33 is rotatably arranged in the limiting groove at one end away from the protective column 30, and abuts against the two groove walls, thereby limiting the lateral movement of the protective column 30.

[0047] Further, refer to Figure 2 、 Figure 4The locking rib 331 is connected to the locking rib 332 and the locking rib 333 is provided on the second locking rib 332.

[0048] In the technical solution adopted in this embodiment, the protective column 30 may further include a first sleeve 31 and a second sleeve 32 that are separately provided. A limiting groove 332 is provided in the second cavity. In this embodiment, one of the first limiting portion and the second limiting portion is provided with a slot, and the other is provided with a block. The slot and the block engage with each other, thereby achieving the fixation of the first limiting portion and the second limiting portion. The first sleeve 31 is inserted from one end of the annular surface surrounding the worm 40, and the second sleeve 32 is inserted from the other end of the annular surface surrounding the worm 40. When the ends of the first sleeve 31 and the second sleeve 32 are in contact, the slot and the block engage, so that when the second sleeve 32 rotates, the first sleeve 31 can be forced to rotate synchronously with the second sleeve 32. The first limiting portion and the second limiting portion can form a limiting rib 331, which cooperates with the limiting groove 332 to effectively limit the lateral movement of the protective column 30, ensuring that the protective column 30 can only rotate axially, thereby improving the accuracy and stability of the annular surface enveloping worm 40 during the adjustment process.

[0049] Further, refer to Figure 2 、 Figure 4 In one embodiment of the present invention, the first sleeve 32 includes a first sleeve body 311, a first protrusion 312 connected to the first sleeve body 311, and a second protrusion 313 connected to the first protrusion 312, which are sequentially arranged. The first protrusion 312 and the second protrusion 313 form a first limiting portion.

[0050] The second sleeve 32 includes a second sleeve body 321, a third protrusion 322 provided on the second sleeve body 321, and a recess 323 provided on the third protrusion 322. The third protrusion 322 and the recess 323 form a second limiting portion.

[0051] The first convex portion 312 cooperates with the third convex portion 322 , and the second convex portion 313 cooperates with the concave portion 323 .

[0052] In the technical solution adopted in this embodiment, the first sleeve 31 may further include a first sleeve body 311, a first protrusion 312, and a second protrusion 313. Correspondingly, the second sleeve 32 may further include a second sleeve body 321, a third protrusion 322, and a recess 323. In this embodiment, the first protrusion 312 and the third protrusion 322 cooperate to primarily limit the lateral movement of the protective cylinder 30. The second protrusion 313 and the recess 323 cooperate to achieve synchronous rotation of the first and second sleeves 31 and 32. It will be appreciated that the first and third protrusions 312 and 322 tightly fit the side walls of the retaining groove 332, effectively limiting the lateral movement of the protective cylinder 30. When the second sleeve body 321 rotates, the second protrusion 313 and the recess 323 transmit the rotational force exerted on the second sleeve 32 to the first sleeve body 311, causing the first sleeve body 311 to rotate with the second sleeve body 321.

[0053] Further, refer to Figure 2 、 Figure 4 In one embodiment of the present invention, one end of the shell 10 is provided with a receiving cavity connected to the second cavity, and the second sleeve 32 also includes a fourth protrusion 324 provided on the second sleeve body 321. The fourth protrusion 324 and the third protrusion 322 are provided on opposite sides of the second sleeve body 321. The fourth protrusion 324 cooperates with the receiving cavity to realize the positioning of the second sleeve 32.

[0054] In the technical solution adopted in this embodiment, the second sleeve 32 may further include a fourth protrusion 324. The housing 10 is provided with a receiving cavity. In this embodiment, the fourth protrusion 324 is installed within the receiving cavity, enabling a more precise position limiting function. This also improves the structural strength of the second sleeve 32, making it easier to bear force and rotate. It also provides a larger contact area and a more stable connection point, facilitating connection with other mechanical components or structures, thereby improving the stability and reliability of the overall structure.

[0055] Further, refer to Figure 2 、 Figure 3 In one embodiment of the present invention, the fourth protrusion 324 is provided with a threaded hole, and the annular envelope worm helical gear transmission mechanism further includes a brushless motor 50, which is threadedly connected to the threaded hole, and the brushless motor 50 is driven and connected to the annular envelope worm 40 to drive the annular envelope worm 40 to rotate.

[0056] In the technical solution adopted in this embodiment, a brushless motor 50 is provided to provide rotational power to the enveloping worm 40, causing the enveloping worm 40 to rotate the helical gear 20, thereby achieving motion transmission. The brushless motor 50 offers advantages such as high efficiency, low noise, and long life, enabling precise driving of the enveloping worm 40. Furthermore, the fourth protrusion 324 can be secured to the brushless motor 50 via a threaded hole, reducing the possibility of loosening of the second sleeve 31 and the first sleeve 32 during operation of the enveloping worm 40, leading to changes in the gap between the helical gear 20 and the enveloping worm 40.

[0057] Further, refer to Figure 2 、 Figure 5 In one embodiment of the present invention, the brushless motor 50 includes a motor body 51, an output shaft 52 connected to the motor body 51, and a threaded column 53 sleeved on the output shaft 52. The output shaft 52 is driven and connected to the annular surface enveloping worm 40, and the threaded column 53 is threadedly connected to the threaded hole.

[0058] In the technical solution adopted in this embodiment, the brushless motor 50 may further include a motor body 51, an output shaft 52, and a threaded column 53. In this embodiment, the motor body 51 is the main part of the brushless motor 50 and can provide power. The output shaft 52 is connected to the motor body 51 and can transmit power to drive the annular envelope worm 40 to rotate. The threaded column 53 is sleeved on the output shaft 52 and is threadedly connected to the second shaft sleeve 32 through a threaded hole. This can ensure the stability of the first shaft sleeve 31 and the second shaft sleeve 32 during the rotation of the annular envelope worm 40, reduce the loosening or vibration of the first shaft sleeve 31 and the second shaft sleeve 32 during the rotation of the annular envelope worm 40, and improve the reliability of the annular envelope worm helical gear transmission mechanism.

[0059] Further, refer to Figure 1 、 Figure 3 In one embodiment of the present invention, the annular envelope worm helical gear transmission mechanism further includes a gear shaft 60. The housing 10 is provided with an output hole communicated with the first cavity. The gear shaft 60 is rotatably arranged in the output hole. One end of the gear shaft 60 is fixedly connected to the helical gear 20, and the other end is exposed to the outside of the housing 10 and is provided with an output position.

[0060] In the technical solution adopted in this embodiment, the rotational motion of the helical gear 20 can be conveniently transmitted to an external device via the provided gear shaft 60. One end of the gear shaft 60 is fixedly connected to the helical gear 20, while the other end is exposed outside the housing 10 and connected to the external device via the output port, thereby achieving synchronous rotation of the external device with the helical gear 20.

[0061] Further, refer to Figure 3 In one embodiment of the present invention, a bearing 70 is provided in the output hole. The bearing 70 has an inner ring and an outer ring. The gear shaft 60 passes through the inner ring.

[0062] In the technical solution adopted in this embodiment, the provision of bearing 70 improves the smoothness of the rotation of gear shaft 60, ensuring stable rotation of gear shaft 60. The fit between the inner and outer rings of bearing 70 enables high-precision and low-friction transmission. It should be noted that the outer ring has an interference fit with the output hole, ensuring the stability of bearing 70.

[0063] Further, refer to Figure 3 In one embodiment of the present invention, the annular surface enveloping worm helical gear transmission mechanism further includes a sealing ring 80 disposed in the output hole, and the gear shaft 60 passes through the sealing ring 80.

[0064] In the technical solution adopted in this embodiment, the sealing ring 80 is provided to reduce the entry of external dust and impurities into the housing 10, keep the interior clean, improve safety and extend the service life of the annular surface enveloping worm helical gear transmission mechanism.

[0065] Further, refer to Figure 1 In one embodiment of the present invention, the housing 10 includes a first housing 11 and a second housing 12 , and the first housing 11 is fixedly connected to the second housing 12 by bolts.

[0066] In the technical solution adopted in this embodiment, the housing 10 may further include a first housing 11 and a second housing 12. In this embodiment, the first housing 11 and the second housing 12 are symmetrically arranged along the axis of the annular envelope worm 40 and are fixedly connected by bolts. This makes installation and removal of the helical gear 20, the annular envelope worm 40, and the protective column 30 more convenient, reducing maintenance costs.

[0067] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A ring-surface enveloping worm helical gear transmission mechanism, characterized in that: include: The housing has a first cavity and a second cavity connected thereto; a helical gear rotatably disposed in the first cavity; a protective column rotatably disposed in the second cavity, the protective column being provided with a placement cavity and an escape opening connecting the first cavity and the second cavity, the axis of the protective column being parallel to the axis of the placement cavity and spaced apart, the protective column being provided with a limiting mechanism connecting the protective column and the housing to limit lateral movement of the protective column; and An annular envelope worm is rotatably disposed in the placement cavity, the axis of the annular envelope worm being collinear with the axis of the placement cavity, and the annular envelope worm being at least partially exposed from the avoidance opening to engage with the helical gear, and the rotation of the protective column causes the annular envelope worm to move along the circumferential direction of the protective column to approach or move away from the helical gear; The limiting mechanism includes a limiting rib and a limiting groove provided in the second cavity, one end of the limiting rib is connected to the protective column, and the other end extends to the limiting groove, and the protective column includes a first shaft sleeve and a second shaft sleeve which are separately arranged, the first shaft sleeve is rotatably connected to one end of the annular surface enveloping worm, and the second shaft sleeve is rotatably connected to the other end of the annular surface enveloping worm, a first limiting portion is provided on the first shaft sleeve, and a second limiting portion is provided on the second shaft sleeve, the second limiting portion is fixedly connected to the first limiting portion so that the first shaft sleeve rotates with the second shaft sleeve, and the first limiting portion and the second limiting portion form the limiting rib, and the limiting rib cooperates with the limiting groove to realize the positioning of the first shaft sleeve and the second shaft sleeve.

2. The annular envelope worm helical gear transmission mechanism according to claim 1, characterized in that: The first sleeve includes a first sleeve body, a first protrusion connected to the first sleeve body, and a second protrusion connected to the first protrusion, the first protrusion and the second protrusion forming the first limiting portion. The second sleeve includes a second sleeve body, a third convex portion provided on the second sleeve body, and a concave portion provided on the third convex portion, wherein the third convex portion and the concave portion form the second limiting portion; Wherein, the first convex portion cooperates with the third convex portion, and the second convex portion cooperates with the concave portion.

3. The annular envelope worm helical gear transmission mechanism according to claim 2, wherein: One end of the shell is provided with a accommodating cavity connected to the second cavity, and the second sleeve also includes a fourth protrusion provided on the second sleeve body, the fourth protrusion and the third protrusion are provided on opposite sides of the second sleeve body, and the fourth protrusion cooperates with the accommodating cavity to realize the positioning of the second sleeve.

4. The annular envelope worm helical gear transmission mechanism according to claim 3, characterized in that: The fourth protrusion is provided with a threaded hole, and the annular surface enveloping worm helical gear transmission mechanism also includes a brushless motor, which is threadedly connected to the threaded hole and drivingly connected to the annular surface enveloping worm to drive the annular surface enveloping worm to rotate.

5. The annular envelope worm helical gear transmission mechanism according to claim 4, characterized in that: The brushless motor includes a motor body, an output shaft connected to the motor body, and a threaded column sleeved on the output shaft. The output shaft is drivingly connected to the annular surface enveloping worm, and the threaded column is threadedly connected to the threaded hole.

6. The annular envelope worm helical gear transmission mechanism according to claim 1, wherein: The annular surface enveloping worm helical gear transmission mechanism also includes a gear shaft. The housing is provided with an output hole connected to the first cavity. The gear shaft is rotatably arranged in the output hole. One end of the gear shaft is fixedly connected to the helical gear, and the other end is exposed to the outside of the housing and is provided with an output position.

7. The annular envelope worm helical gear transmission mechanism according to claim 6, wherein: A bearing is provided in the output hole. The bearing has an inner ring and an outer ring. The gear shaft passes through the inner ring.

8. The annular envelope worm helical gear transmission mechanism according to claim 6, wherein: The annular surface enveloping worm helical gear transmission mechanism further includes a sealing ring disposed in the output hole, and the gear shaft passes through the sealing ring.

9. The annular envelope worm helical gear transmission mechanism according to claim 1, wherein: The housing includes a first housing and a second housing, and the first housing is fixedly connected to the second housing by bolts.

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