Anti-backlash mechanism with double worm gears and worms with different moduli

Abstract

A different-modulus double-worm gear and worm anti-backlash mechanism comprises a machine shell, a rotary table is arranged in the machine shell, a driving worm gear and an anti-backlash worm gear are sleeved outside the rotary table, a driving worm and an anti-backlash worm which are respectively meshed with the driving worm gear and the anti-backlash worm gear are assembled on the machine shell, one end of the driving worm is in transmission connection with a motor, and the other end of the driving worm is in transmission connection with the motor. The driving worm is in transmission connection with the anti-backlash worm through a gear assembly, and the modulus of the driving worm gear is different from that of the anti-backlash worm gear. The utility model is used for solving the problem that the transmission precision is influenced because a clearance exists between the worm gear and the worm driving the rotary table to rotate.

Description

Technical Field

[0001] This utility model relates to a backlash elimination mechanism for a double worm gear with different modules. Background Technology

[0002] When a worm gear and worm wheel drive a rotary table to rotate, only one side of the tooth surface of the worm and worm wheel is in contact, inevitably leaving a gap on the other side. Existing worm gear backlash elimination mechanisms use worm gears and worm wheels of the same module, employing methods such as axially pushing and pulling the worm with a hydraulic cylinder to eliminate backlash, and adjusting the axial installation position of the worm to reduce backlash. However, these methods often require high-precision installation processes and are prone to positional shifts due to vibration and other factors during long-term use, leading to the re-introduction of backlash. Furthermore, while using elastic elements to assist in backlash elimination can alleviate the problem to some extent, the selection of the elastic coefficient of the elastic element is complex and difficult to adapt to the backlash elimination requirements under different working conditions. Utility Model Content

[0003] The purpose of this invention is to provide a backlash-eliminating mechanism for a double worm gear with different modules, which solves the problem of backlash in the worm gear and worm driving the rotary table, affecting the transmission accuracy.

[0004] To solve the above problems, the technical solution of this utility model is as follows:

[0005] A backlash elimination mechanism with different modules includes a housing, a rotary table inside the housing, a driving worm gear and a backlash elimination worm gear sleeved on the rotary table, and a driving worm gear and a backlash elimination worm gear respectively meshing with the driving worm gear and the backlash elimination worm gear mounted on the housing. One end of the driving worm gear is connected to a motor for transmission, and the driving worm gear is connected to the backlash elimination worm gear for transmission through a gear assembly. The modules of the driving worm gear and the backlash elimination worm gear are different.

[0006] The module of the active worm gear is less than that of the backlash-free worm gear.

[0007] Both ends of the driving worm and the backlash-free worm are assembled in the housing via needle roller bearings, and the housing has oil injection holes that connect the needle roller bearings.

[0008] The gear ratio between the driving worm and the backlash-free worm is greater than 1.

[0009] The beneficial effects of this utility model are as follows: Compared with two worms of the same module, this utility model uses two worms of different modules to drive the worm wheel, completely eliminating the backlash between the worm and the worm wheel, and ensuring sufficient backlash elimination pressure. The backlash elimination rigidity is better, reducing axial movement or damage to the worm wheel tooth surface, while improving the accuracy and rigidity of the worktable. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings:

[0011] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0012] Figure 2 This is a cross-sectional structural diagram of the active worm gear of this utility model.

[0013] Figure 3 This is a cross-sectional structural diagram of the backlash-free worm gear of this utility model.

[0014] In the diagram: 1. Rotary table; 2. Driving worm gear; 3. Driving worm; 4. Backlash-free worm; 5. Backlash-free worm gear; 6. Needle roller bearing; 7. Gear assembly; 8. Motor. Detailed Implementation

[0015] 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 some embodiments of the present utility model, and not all 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.

[0016] like Figures 1 to 3 As shown, a double worm gear backlash elimination mechanism includes a housing, a rotary table 1 inside the housing, a drive worm gear 2 and a backlash elimination worm gear 5 mounted on the rotary table 1, and a drive worm 3 and a backlash elimination worm gear 4 respectively meshing with the drive worm gear 2 and the backlash elimination worm gear 5 mounted on the housing. One end of the drive worm 3 is connected to a motor 8 for transmission, and the drive worm 3 is connected to the backlash elimination worm gear 4 for transmission through a gear assembly 7. The module of the drive worm gear 2 and the module of the backlash elimination worm gear 5 are different. For example, the axial module of the drive worm gear 3 is 6, the number of teeth is 185, the meshing tooth is 1, and the helical direction is right; the axial module of the backlash elimination worm gear 5 is 10, the number of teeth is 111, the meshing tooth is 1, and the helical direction is left.

[0017] In use, the motor 8 drives the active worm 3 to rotate, and the active worm 3 drives the backlash-free worm 4 to rotate synchronously through the gear assembly 7. Since the modules of the active worm 3 and the backlash-free worm 4 are different, when the active worm 3 drives the active worm wheel 2 to rotate, the backlash-free worm 4 and the backlash-free worm wheel 5 can compensate for the backlash between the active worm 3 and the active worm wheel 2, thus ensuring transmission accuracy.

[0018] Both ends of the driving worm 3 and the backlash-free worm 4 are mounted in the housing via needle roller bearings 6. An oil filling hole is provided on the housing, connecting the needle roller bearings 6. Compared to ball bearings, needle roller bearings 6 can provide higher load-bearing capacity and reduce wear. Furthermore, lubricating oil can be easily added to the needle roller bearings 6 through the oil filling hole.

[0019] The driving worm 3 and the backlash-eliminating worm 4 have the same diameter. This structure results in higher indexing accuracy with a smaller module and more teeth, while the backlash-eliminating worm wheel has a larger module and better backlash-eliminating rigidity. This design structure improves both the accuracy and rigidity of the worktable.

[0020] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A backlash elimination mechanism for a double worm gear with different modules, comprising a housing, and a rotary table (1) provided inside the housing, characterized in that: The rotary table (1) is fitted with a drive worm gear (2) and a backlash-free worm gear (5). The housing is fitted with a drive worm (3) and a backlash-free worm (4) that mesh with the drive worm gear (2) and the backlash-free worm gear (5) respectively. One end of the drive worm (3) is connected to the motor (8) for transmission. The drive worm (3) is connected to the backlash-free worm (4) for transmission through a gear assembly (7). The module of the drive worm gear (2) is different from that of the backlash-free worm gear (5).

2. The backlash elimination mechanism for a double worm gear with different modules according to claim 1, characterized in that: The module of the active worm gear (2) is less than that of the backlash-free worm gear (5).

3. The backlash elimination mechanism for a double worm gear with different modules according to claim 1, characterized in that: Both ends of the drive worm (3) and the backlash-free worm (4) are assembled in the housing through needle roller bearings (6), and an oil injection hole connected to the needle roller bearings (6) is provided on the housing.

4. The backlash elimination mechanism for a double worm gear with different modules according to claim 1, characterized in that: The gear transmission ratio between the driving worm (3) and the backlash-free worm (4) is greater than 1.

5. The backlash elimination mechanism for a double worm gear with different modules according to claim 1, characterized in that: The diameter of the active worm (3) is the same as that of the backlash-free worm (4).

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