Toroidal enveloping worm helical gear transmission mechanism

Abstract

The utility model discloses an annular enveloping worm helical gear transmission mechanism, which relates to the technical field of robots, and comprises a shell, a first containing cavity and a second containing cavity which are communicated with each other are arranged in the shell; the helical gear is rotationally arranged in the first accommodating cavity; the protection column body is rotationally arranged in the second containing cavity, the protection column body is provided with a containing cavity and an avoiding opening communicating with the first containing cavity and the second containing cavity, and the axis of the protection column body and the axis of the containing cavity are parallel and arranged in a spaced mode; the annular enveloping worm is rotationally arranged in the containing cavity, the axis of the annular enveloping worm and the axis of the containing cavity are collinear, at least part of the annular enveloping worm is exposed out of the receding opening so as to be meshed with the bevel gear, and the protective column rotates so that the annular enveloping worm can move in the circumferential direction of the protective column so as to be close to or away from the bevel gear. According to the technical scheme provided by the utility model, the gap between the helical gear and the ring enveloping worm in the ring enveloping worm helical gear transmission mechanism is reduced.

Description

Technical Field

[0001] This utility model relates to the field of robotics technology, and in particular to a ring-enveloping worm gear helical gear transmission mechanism. Background Technology

[0002] The helical gear transmission mechanism with an enveloped worm is a common mechanical transmission device used to transmit motion and power between two intersecting shafts. It is often used in applications with large transmission ratios, low transmission power, or intermittent operation. The helical gear and the enveloped worm are equivalent to a gear and rack in their mid-plane, and the enveloped worm is also similar in shape to a screw. The two shafts in the helical gear transmission mechanism typically have an intersection angle of 90°, and the enveloped worm is generally the driving element. During operation, the helical gear teeth slide and roll along the helical surface of the enveloped worm. In traditional helical gear transmission mechanisms with an enveloped worm, the center distance between the helical gear and the enveloped worm is relatively fixed; this design mainly relies on machining accuracy to ensure clearance.

[0003] However, during use, due to assembly and dimensional deviations, backlashes are prone to occur in existing ring-enveloping worm gear helical gear transmission mechanisms, affecting transmission accuracy and stability. Utility Model Content

[0004] The main purpose of this invention is to propose a ring-enveloping worm gear helical gear transmission mechanism, which aims to reduce the gap between the helical gear and the ring-enveloping worm in the ring-enveloping worm gear helical gear transmission mechanism.

[0005] For the above objectives, the present invention provides a ring-enveloping worm gear helical gear transmission mechanism, comprising:

[0006] The shell has a first cavity and a second cavity that are connected to each other inside;

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

[0008] A protective column is rotatably mounted in the second cavity. The protective column has a placement cavity and a clearance opening connecting the first cavity and the second cavity. The axis of the protective column is parallel to and spaced apart from the axis of the placement cavity.

[0009] A circumferential worm gear is rotatably disposed in the placement cavity. The axis of the circumferential worm gear and the axis of the placement cavity are collinear. The circumferential worm gear is at least partially exposed in the clearance opening to mesh with the helical gear. The rotation of the protective column causes the circumferential worm gear to move along the circumferential direction of the protective column to move closer to or away from the helical gear.

[0010] In one embodiment, the annular envelope worm gear helical gear transmission mechanism further includes a first bearing, through which the helical gear is rotatably connected to the first cavity; and / or,

[0011] The annular envelope worm gear helical gear transmission mechanism also includes a second bearing, through which the annular envelope worm is rotatably connected to the placement cavity.

[0012] In one embodiment, the surface of the inner sidewall of the first cavity is adapted to the shape of the helical gear; and / or,

[0013] The surface of the inner wall of the second cavity is adapted to the shape of the protective column.

[0014] In one embodiment, the opening size of the clearance is greater than the rotation length of the protective column.

[0015] In one embodiment, the annular envelope worm gear transmission mechanism further includes a gear shaft. The housing has an output hole that communicates with the first cavity. The gear shaft is rotatably disposed in the output hole. One end of the gear shaft is fixedly connected to the helical gear, and the other end is exposed on the outside of the housing and has an output position.

[0016] In one embodiment, the gear shaft and the helical gear are integrally formed.

[0017] In one embodiment, the annular envelope worm gear transmission mechanism further includes a sealing ring disposed within the output hole, and the gear shaft passes through the sealing ring.

[0018] In one embodiment, the annular envelope worm gear helical gear transmission mechanism further includes a brushless motor disposed in the housing for driving the annular envelope worm to rotate.

[0019] In one embodiment, one end of the protective column is provided with a threaded hole communicating with the placement cavity. The brushless motor includes a motor body, an output shaft connected to the motor body, and a threaded post sleeved on the output shaft. The output shaft is driven and connected to the annular worm gear, and the threaded post is threadedly connected to the threaded hole.

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

[0021] In the technical solution provided by this utility model, the housing provides overall support for the ring-enveloping worm gear helical gear transmission mechanism. The housing has a first cavity and a second cavity that are connected, allowing the helical gear and the ring-enveloping worm to be placed within these cavities. The helical gear is the driven component in the ring-enveloping worm gear helical gear transmission mechanism, while the ring-enveloping worm is the driving component. Motion transmission is achieved through the meshing of the ring-enveloping worm and the helical gear. In this embodiment, a protective column is provided, and the ring-enveloping worm is installed within the placement cavity of the protective column. By driving the protective column to rotate, the ring-enveloping worm can move along the circumferential direction of the protective column, thereby approaching the helical gear to reduce clearance. It is understandable that, since 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 inside it will also rotate. Since the axes of the placement cavity and the annular envelope worm are collinear, the position of the annular envelope worm in the placement cavity will not change, but the rotation of the protective column will 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. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the annular enveloping worm gear helical gear transmission mechanism provided by this utility model;

[0024] Figure 2 A cross-sectional structural schematic diagram of an embodiment of the annular envelope worm gear helical gear transmission mechanism provided by this utility model;

[0025] Figure 3 A schematic diagram of the structure from another perspective of an embodiment of the annular enveloping worm gear helical gear transmission mechanism provided by this utility model;

[0026] Figure 4 A schematic diagram of the installation structure of an embodiment of the annular enveloping worm gear provided by this utility model;

[0027] Figure 5 A three-dimensional structural schematic diagram of an embodiment of the brushless motor provided by this utility model.

[0028] Explanation of icon numbers:

[0029] 10. Housing; 11. First housing; 12. Second housing; 20. Helical gear; 30. Protective column; 40. Circular envelope worm gear; 50. First bearing; 60. Second bearing; 70. Gear shaft; 80. Sealing ring; 90. Brushless motor; 91. Motor body; 92. Output shaft; 93. Threaded column.

[0030] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one part of the embodiments of the present utility model, and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0033] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] In helical gear ring-enveloping worm gear mechanisms, the helical gear teeth slide and roll along the helical surface of the ring-enveloping worm during operation. Due to assembly and dimensional deviations, backlash easily occurs in existing ring-enveloping worm helical gear transmission mechanisms, affecting transmission accuracy and stability. If the backlash is too large, it will lead to decreased transmission accuracy, increased positioning errors, and reduced transmission efficiency. This not only increases energy consumption but may also affect the long-term operating efficiency of the equipment.

[0035] In view of this, the present invention provides a ring-enveloping worm gear helical gear transmission mechanism. By setting a protective column with an eccentric placement cavity, the protective column is rotatably connected to the housing. 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, it can drive the ring-enveloping worm to move toward the helical gear, so that the helical gear and the ring-enveloping worm are tightly fitted together.

[0036] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.

[0037] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides a ring-enveloping worm gear helical gear transmission mechanism, comprising:

[0038] The housing 10 has a first cavity and a second cavity that are connected to each other inside;

[0039] Helical gear 20 is rotatably mounted in the first cavity;

[0040] A protective column 30 is rotatably mounted in the second cavity. The protective column 30 has a placement cavity and a clearance opening connecting the first and second cavities. The axis of the protective column 30 is parallel to and spaced apart from the axis of the placement cavity.

[0041] The circumferential worm gear 40 is rotatably disposed in the placement cavity. The axis of the circumferential worm gear 40 is collinear with the axis of the placement cavity, and the circumferential worm gear 40 is at least partially exposed in the clearance opening to mesh with the helical gear 20. The rotation of the protective column 30 causes the circumferential worm gear 40 to move along the circumferential direction of the protective column 30 to approach or move away from the helical gear 20.

[0042] In this embodiment, the housing 10 provides overall support for the helical gear transmission mechanism with annular envelope worm gear. The housing 10 has a first cavity and a second cavity that are connected, allowing the helical gear 20 and the helical gear 40 to be placed within them. The helical gear 20 is the driven component in the helical gear transmission mechanism, while the helical gear 40 is the driving component. Motion transmission is achieved through the meshing of the helical gear 20 and the helical gear 40. In this embodiment, a protective column 30 is provided, and the helical gear 40 is installed within its placement cavity. By driving the protective column 30 to rotate, the helical gear 40 can move along the circumferential direction of the protective column 30, thereby moving closer to the helical gear 20 to reduce clearance. It is understandable that, since the axis of the protective column 30 is parallel to and spaced apart from the axis of the placement cavity, when the protective column 30 rotates, the placement cavity inside it will also rotate. Since the axes of the placement cavity and the annular envelope worm gear 40 are collinear, the position of the annular envelope worm gear 40 in the placement cavity will not change, but the rotation of the protective column 30 will change the position of the annular envelope worm gear 40 relative to the helical gear 20, thereby reducing the gap between the helical gear 20 and the annular envelope worm gear 40.

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

[0044] The housing 10 is typically made of metal and has sufficient strength and rigidity to ensure the stability and durability of the annular envelope worm gear helical gear transmission mechanism. A first cavity houses the helical gear 20, and a second cavity houses the protective column 30 and the annular envelope worm 40.

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

[0046] The protective column 30 is used to adjust the position of the annular envelope worm gear 40, thereby adjusting the gap between the helical gear 20 and the annular envelope worm gear 40. The protective column 30 is disposed within the second cavity, which has an internal placement cavity for placing the annular envelope worm gear 40. Furthermore, the axis of the protective column 30 is parallel to and spaced apart from the axis of the placement cavity, while the axis of the annular envelope worm gear 40 is collinear with the axis of the placement cavity. Thus, when the protective column 30 is driven to rotate, the relative position of the annular envelope worm gear 40 and the helical gear 20 changes. By adjusting the rotation angle of the protective column 30, the size of the gap between the annular envelope worm gear 40 and the helical gear 20 can be controlled. It is understood that a larger rotation angle results in a smaller gap between the helical gear 20 and the annular envelope worm gear 40, and a smaller rotation angle results in a larger gap between the helical gear 20 and the annular envelope worm gear 40. By providing an allowance opening on the protective column 30 to connect the first and second cavities, the annular enveloping worm gear 40 can be at least partially exposed to mesh with the helical gear 20. The protective column 30 can be an integral structure to improve adjustment accuracy, or it can be a split structure to facilitate the installation of the annular enveloping worm gear 40 within the placement cavity of the protective column 30. The rotation of the protective column 30 can be driven by an external motor or manually, without limitation. To improve reliability, a limiting mechanism can be provided on the protective column 30, and a limiting groove can be provided in the second cavity. The limiting groove has one ring along the rotation direction of the protective column 30. One end of the limiting mechanism is connected to the protective column 30, and the other end is located in the limiting groove. The limiting groove has two groove walls arranged opposite each other along the axial direction of the protective column 30. The end of the limiting mechanism away from the protective column 30 is rotatably positioned in the limiting groove and abuts against the two groove walls, thereby restricting the lateral movement of the protective column 30.

[0047] Furthermore, refer to Figure 3 , Figure 4 In one embodiment of this utility model, the annular envelope worm gear helical gear transmission mechanism further includes a first bearing 50, and the helical gear 20 is rotatably connected to the first cavity through the first bearing 50; and / or,

[0048] The ring-enveloping worm gear helical gear transmission mechanism also includes a second bearing 60, through which the ring-enveloping worm 40 is rotatably connected to the placement cavity.

[0049] In this embodiment, the first bearing 50 enables the helical gear 20 to rotate smoothly within the first cavity and can withstand the radial and axial forces generated by the helical gear 20 during operation. The first bearing 50 reduces friction between the helical gear 20 and the housing 10, improving transmission efficiency, reducing wear, and extending the service life of both the helical gear 20 and the housing 10. The second bearing 60 enables the annular envelope worm gear 40 to rotate smoothly within the placement cavity and provides support. When the protective column 30 rotates, the annular envelope worm gear 40 is subjected to force and rotates circumferentially along with the placement cavity. The second bearing 60 reduces friction between the annular envelope worm gear 40 and the protective column 30, improving transmission efficiency and ensuring that the annular envelope worm gear 40 follows the positional changes of the placement cavity, thus improving reliability.

[0050] Furthermore, refer to Figure 2 In one embodiment of this utility model, the surface of the inner sidewall of the first cavity is adapted to the shape of the helical gear 20; and / or,

[0051] The surface of the inner wall of the second cavity is adapted to the shape of the protective column 30.

[0052] In the technical solution adopted in this embodiment, by setting it up in this way, the ring-enveloping worm gear helical gear transmission mechanism can achieve smoother and more efficient rotation, reduce friction and wear, and also reduce the gap between the helical gear 20 and the ring-enveloping worm 40, thereby improving transmission accuracy and stability.

[0053] Furthermore, in one embodiment of this utility model, the opening size of the clearance opening is greater than the rotation length of the protective column 30.

[0054] In this embodiment, the technical solution ensures that the annular worm gear 40 is not restricted during the rotation of the protective column 30 and remains engaged with the helical gear 20. This also reduces the possibility of jamming or damage due to insufficient size, thereby improving the reliability of the annular worm gear helical gear transmission mechanism. Furthermore, under different operating conditions, the annular worm gear 40 may require different position adjustments; the larger clearance provides sufficient space, allowing the annular worm gear 40 to be flexibly adjusted according to actual needs to adapt to various operating conditions.

[0055] Furthermore, refer to Figure 1 , Figure 3 In one embodiment of the present invention, the annular envelope worm gear helical gear transmission mechanism further includes a gear shaft 70. The housing 10 is provided with an output hole that communicates with the first cavity. The gear shaft 70 is rotatably disposed in the output hole. One end of the gear shaft 70 is fixedly connected to the helical gear 20, and the other end is exposed on the outside of the housing 10 and is provided with an output position.

[0056] In the technical solution adopted in this embodiment, the rotational motion of the helical gear 20 can be conveniently transmitted to an external device through the gear shaft 70. One end of the gear shaft 70 is fixedly connected to the helical gear 20, and the other end is exposed on the outside of the housing 10 and connected to the external device through the output position, thereby realizing that the external device rotates synchronously with the helical gear 20.

[0057] Furthermore, in one embodiment of this utility model, the gear shaft 70 and the helical gear 20 are integrally formed.

[0058] In this embodiment, the overall structure is simplified, precision and strength are improved, maintenance costs are reduced, and the reliability and transmission efficiency of the ring-enveloping worm gear helical gear transmission mechanism are enhanced. The integrally formed gear shaft 70 and helical gear 20 have higher strength and rigidity, and can withstand greater loads.

[0059] Furthermore, refer to Figure 1 , Figure 3 In one embodiment of this utility model, the annular envelope worm gear transmission mechanism further includes a sealing ring 80, which is disposed in the output hole, and the gear shaft 70 passes through the sealing ring 80.

[0060] In the technical solution adopted in this embodiment, the sealing ring 80 can reduce the entry of external dust and impurities into the housing 10, keep the inside clean, improve safety, and extend the service life of the annular envelope worm gear transmission mechanism.

[0061] Furthermore, refer to Figure 1 , Figure 2 In one embodiment of the present invention, the annular envelope worm gear helical gear transmission mechanism further includes a brushless motor 90, which is disposed in the housing 10 and is used to drive the annular envelope worm 40 to rotate.

[0062] In this embodiment, the brushless motor 90 provides rotational power to the annular envelope worm gear 40, causing the annular envelope worm gear 40 to drive the helical gear 20 to rotate, thereby achieving motion transmission. The brushless motor 90 has advantages such as high efficiency, low noise, and long lifespan, and can achieve precise driving of the annular envelope worm gear 40.

[0063] Furthermore, refer to Figure 3 , Figure 5 In one embodiment of this utility model, one end of the protective column 30 is provided with a threaded hole that communicates with the placement cavity. The brushless motor 90 includes a motor body 91, an output shaft 92 connected to the motor body 91, and a threaded column 93 sleeved on the output shaft 92. The output shaft 92 is driven to connect with the worm gear 40 that encloses the annular area, and the threaded column 93 is threaded to the threaded hole.

[0064] In this embodiment, the brushless motor 90 may further include a motor body 91, an output shaft 92, and a threaded post 93. In this embodiment, the motor body 91 is the main body of the brushless motor 90 and provides power. The output shaft 92 is connected to the motor body 91 and transmits power to drive the annular envelope worm gear 40 to rotate. The threaded post 93 is sleeved on the output shaft 92 and threadedly connected to the protective post 30 through a threaded hole. This ensures the stability of the protective post 30 during the rotation of the annular envelope worm gear 40, reduces the possibility of the protective post 30 loosening or vibrating during rotation, causing changes in the clearance between the helical gear 20 and the annular envelope worm gear 40, and improves the reliability of the annular envelope worm gear helical gear transmission mechanism.

[0065] Furthermore, refer to Figure 1 In one embodiment of the present invention, the housing 10 includes a first housing 11 and a second housing 12, wherein 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 circumferential worm gear 40 and are fixedly connected by bolts, which makes the installation and disassembly of the helical gear 20, the circumferential worm gear 40 and the protective column 30 more convenient and reduces maintenance costs.

[0067] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A ring-enveloping worm gear helical gear transmission mechanism, characterized in that, include: The shell has a first cavity and a second cavity that are connected to each other inside; A helical gear is rotatably disposed in the first cavity; A protective column is rotatably mounted in the second cavity. The protective column has a placement cavity and a clearance opening connecting the first cavity and the second cavity. The axis of the protective column is parallel to and spaced apart from the axis of the placement cavity. A circumferential worm gear is rotatably disposed in the placement cavity. The axis of the circumferential worm gear and the axis of the placement cavity are collinear. The circumferential worm gear is at least partially exposed in the clearance opening to mesh with the helical gear. The rotation of the protective column causes the circumferential worm gear to move along the circumferential direction of the protective column to move closer to or away from the helical gear.

2. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The annular envelope worm gear helical gear transmission mechanism further includes a first bearing, through which the helical gear is rotatably connected to the first cavity; and / or The annular envelope worm gear helical gear transmission mechanism also includes a second bearing, through which the annular envelope worm is rotatably connected to the placement cavity.

3. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The surface of the inner wall of the first cavity is adapted to the shape of the helical gear; and / or, The surface of the inner wall of the second cavity is adapted to the shape of the protective column.

4. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The opening size of the clearance is greater than the rotation length of the protective column.

5. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The annular envelope worm gear helical gear transmission mechanism also includes a gear shaft. The housing is provided with an output hole that communicates with the first cavity. The gear shaft is rotatably disposed in the output hole. One end of the gear shaft is fixedly connected to the helical gear, and the other end is exposed on the outside of the housing and is provided with an output position.

6. The annular envelope worm gear helical gear transmission mechanism as described in claim 5, characterized in that, The gear shaft and the helical gear are integrally formed.

7. The annular envelope worm gear helical gear transmission mechanism as described in claim 5, characterized in that, The annular envelope worm gear helical gear transmission mechanism also includes a sealing ring disposed in the output hole, and the gear shaft passes through the sealing ring.

8. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The annular envelope worm gear helical gear transmission mechanism also includes a brushless motor, which is located in the housing and is used to drive the annular envelope worm to rotate.

9. The annular envelope worm gear helical gear transmission mechanism as described in claim 8, characterized in that, One end of the protective column is provided with a threaded hole that communicates with the placement cavity. The brushless motor includes a motor body, an output shaft connected to the motor body, and a threaded post sleeved on the output shaft. The output shaft is driven by the worm gear of the annular envelope, and the threaded post is threadedly connected to the threaded hole.

10. The annular envelope worm gear helical gear transmission mechanism as described in claim 1, characterized in that, The housing includes a first housing and a second housing, wherein the first housing is fixedly connected to the second housing by bolts.

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