Worm and gear clearance eliminating mechanism

Abstract

The utility model discloses a worm and gear backlash eliminating mechanism which comprises a tile seat, a tile frame and a tile shaft, a worm is arranged in the tile seat, and the tile frame and the tile seat are both in shaft connection with the tile shaft. The tile frame is fixed on the supporting plate; an ejector rod is arranged on the supporting plate, the outer side of the ejector rod abuts against the tilting fillet, the inner side of the ejector rod is inserted into an ejector rod hole of the supporting plate and abuts against one end of a spring, and the other end of the spring abuts against an adjusting screw screwed in the ejector rod hole; the worm is meshed with the worm gear; the worm is connected with the output end of the motor through a coupler. The backlash eliminating mechanism has the advantages that the tilting fillet in the backlash eliminating mechanism can rotate around the tilting fillet shaft in a small range, and the spring pushes the tilting fillet to enable teeth of the worm gear and teeth of the worm to be in a zero-backlash state all the time when the worm and the worm gear are meshed in a forward rotation or reverse rotation mode. The problem of rotation clearance generated during rotation caused by machining errors and assembly errors of the worm gear and the worm is solved, and the worm gear and worm gear assembly is suitable for high-precision rotation.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, specifically to a transmission mechanism, and more specifically to a worm and worm gear transmission device. Background Art

[0002] At present, in the existing worm and worm gear transmission devices, no matter how high the machining accuracy and assembly accuracy of the worm and worm gear are, there is always a backlash. Because the current technology is to adjust the worm and worm gear to the best clearance and then lock the bearing bracket to keep the position of the worm and worm gear unchanged. The larger the clearance between the worm and worm gear, the worse the accuracy; the smaller the clearance, the higher the accuracy. However, if the clearance is adjusted too small, it is easy to get stuck. Even if the clearance is adjusted smaller, it is impossible to avoid the existence of backlash. In this way, when we need a high-precision transmission device, there is no worm and worm gear transmission device that can meet the requirements. There is an urgent need for a worm and worm gear backlash elimination mechanism with zero backlash. Summary of the Utility Model

[0003] Aiming at the shortcoming that in the prior art, the worm and worm gear are adjusted to the best clearance and then the bearing bracket is locked to keep the position of the worm and worm gear unchanged, resulting in the problem of backlash, in order to achieve the purpose of no backlash and high-precision transmission of the worm and worm gear, the utility model provides a worm and worm gear backlash elimination mechanism, which includes a bearing seat, a bearing bracket, and a bearing shaft. The worm is arranged in the bearing seat, and both the bearing bracket and the bearing seat are pivotally connected to the bearing shaft; the bearing bracket is fixed on the support plate; a push rod is arranged on the support plate, the outer side of the push rod abuts against the bearing seat, the inner side of the push rod is inserted into the push rod hole of the support plate and abuts against one end of a spring, and the other end of the spring abuts against an adjusting screw screwed in the push rod hole;

[0004] The worm meshes with the worm gear; the worm is connected to the output end of the motor through a coupling.

[0005] Bearings are installed at both ends of the worm, and the bearings are installed inside the bearing seat. Bearing covers are installed at both ends of the bearing seat to lock the bearings; a locking nut is provided at one end of the bearing shaft to fix the bearing shaft.

[0006] The worm gear is installed on the upper surface of the inner ring of the slewing bearing. The outer ring of the slewing bearing is installed inside the bearing housing; a motor fixing seat is installed at one end of the bearing housing, a motor is installed on the motor fixing seat, the motor is connected to the worm in the worm and worm gear backlash elimination mechanism through an elastic coupling, and a turntable is installed above the worm gear.

[0007] A set screw hole perpendicular to the bearing shaft is provided on the bearing bracket, and the bearing shaft is locked through the set screw.

[0008] Two connecting parts are provided at the lower end of the bearing seat, through holes are provided in the connecting parts, and through holes are also provided in the bearing bracket. The bearing shaft passes through the through holes to connect the bearing seat and the bearing bracket; through holes are provided on one side of the bearing seat close to the worm gear to ensure that the worm can mesh with the worm gear.

[0009] The advantages of the present utility model are as follows: 1. The worm can be floatingly meshed with the worm wheel to achieve zero backlash, greatly improving the accuracy and being applicable to high-precision occasions; 2. The structure is novel and unique. By rotating the adjusting screw, the meshing tightness of the worm and worm wheel can be adjusted, facilitating assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of the present utility model;

[0011] Figure 2 is a schematic diagram of the present utility model after removing the turntable;

[0012] Figure 3 is Figure 1 front cross-sectional view of

[0013] Figure 4 is Figure 1 top view of

[0014] Figure 5 is Figure 1 left cross-sectional view of

[0015] Figure 6 is a schematic diagram of the backlash elimination mechanism;

[0016] Figure 7 is the front cross-sectional view of the backlash elimination mechanism;

[0017] Figure 8 is the top cross-sectional view of the backlash elimination mechanism;

[0018] Figure 9 is the left cross-sectional view of the backlash elimination mechanism;

[0019] Among them, 1 is the backlash elimination mechanism, 101 is the worm, 102 is the bearing, 103 is the tile seat, 104 is the tile seat cover, 105 is the tile shaft, 106 is the tile frame, 107 is the locking nut, 108 is the support plate, 109 is the adjusting screw, 110 is the ejector rod, 111 is the spring, 2 is the worm wheel, 3 is the slewing bearing, 4 is the bearing housing, 5 is the motor fixing seat, 6 is the motor, 7 is the elastic coupling, and 8 is the turntable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present utility model will be further described below in conjunction with the accompanying drawings of the specification.

[0021] As Figures 6 to 9 shown, a worm and worm wheel backlash elimination mechanism 1. Bearings 102 are installed at both ends of the worm 101 of the backlash elimination mechanism 1. The bearings 102 are installed inside the tile seat 103. Tile seat covers 104 are installed at both ends of the tile seat 103 to lock the bearings 102;

[0022] The tile seat 103 is connected to the tile frame 106 through the tile shaft 105. Specifically:

[0023] Two connecting parts 1031 are provided at the lower end of the tile seat 103. Through holes are provided in the connecting parts, and through holes are also provided in the tile frame 106. The tile shaft passes through the through holes to connect the tile seat and the tile frame; a through hole 1032 is provided on one side of the tile seat 103 close to the worm gear 2 to ensure that the worm 101 can mesh with the worm gear 2;

[0024] Threaded holes perpendicular to the tile shaft are provided on the tile frame 106. The tile shaft 105 is locked by a setscrew, and the tile seat 103 can rotate around the tile shaft 105;

[0025] A locking nut 107 is provided at one end of the tile shaft 105 to fix the tile shaft. The tile frame 106 is fixedly installed on the support plate 108. A ejector rod hole is provided on the support plate 108. An adjusting screw 109 is provided at the outer end of the ejector rod hole. A spring 111 is installed inside the ejector rod hole. One end of the spring 111 abuts against the adjusting screw 109, and the other end of the spring 111 abuts against the inner end of the ejector rod 110. The outer end of the ejector rod 110 abuts against the tile seat 103.

[0026] The worm 101 of the backlash elimination mechanism 1 meshes with the worm gear 2. The worm gear 2 is installed on the upper surface of the inner ring of the slewing bearing 3. The outer ring of the slewing bearing 3 is installed inside the bearing housing 4. One end of the bearing housing 4 is installed with a motor fixing seat 5. A motor 6 is installed on the motor fixing seat 5. The motor 6 is connected to the worm 101 in the worm gear backlash elimination mechanism 1 through an elastic coupling 7. A turntable 8 is installed above the worm gear 2.

[0027] As Figure 5 shown, the tile seat 103 in the backlash elimination mechanism 1 can rotate around the tile shaft 105 within a small range, that is, the worm 101 can rotate around the tile shaft 105 within a small range. Under the push of the spring 111, the worm 101 and the worm gear 2 are always in a zero-clearance state. When the worm gear 2 and the worm 101 rotate, due to the position difference of each tooth on the worm gear 2 caused by machining errors or assembly errors, the worm 101 will automatically adjust its position.

[0028] As Figures 2 to 4 shown, the elastic coupling 7 connects the worm 101 and the motor 6. When the worm 101 meshes with the worm gear 2 and the position of the worm 101 changes, the flexible connection of the elastic coupling 7 will eliminate the offset between the motor 6 and the worm 101.

Claims

1. A worm gear anti-backlash mechanism, characterized in that: It includes a tile seat, a tile frame, and a tile shaft. The worm is arranged in the tile seat. The tile frame and the tile seat are both axially connected to the tile shaft. The tile frame is fixed on the support plate. A push rod is arranged on the support plate. The outer side of the push rod abuts against the tile seat. The inner side of the push rod is inserted into the push rod hole of the support plate and abuts against one end of the spring. The other end of the spring abuts against the adjustment screw screwed into the push rod hole. The worm is meshed with the worm wheel; the worm is connected to the output end of the motor through a coupling.

2. A worm gear anti-backlash mechanism according to claim 1, characterized in that: Bearings are installed at both ends of the worm, the bearings are installed inside the shoe seat, shoe seat covers are installed at both ends of the shoe seat to lock the bearings; a locking nut is provided at one end of the shoe shaft to fix the shoe shaft.

3. The worm gear anti-backlash mechanism according to claim 1, characterized in that: The worm wheel is installed on the inner ring of the slewing bearing, and the outer ring of the slewing bearing is installed inside the bearing chamber; a motor fixing seat is installed at one end of the bearing chamber, and a motor is installed on the motor fixing seat. The motor is connected to the worm in the worm gear anti-backlash mechanism through an elastic coupling, and a turntable is installed above the worm wheel.

4. A worm gear anti-backlash mechanism according to claim 1, characterized in that: The tile frame is provided with a top screw hole perpendicular to the tile axis, and the tile axis is locked by the top screw.

5. The worm gear anti-backlash mechanism according to claim 1, characterized in that: Two connecting parts are arranged at the lower end of the tile seat, and the connecting parts are arranged with through holes, and the tile frame is also arranged with through holes, and the tile shaft passes through the through holes to connect the tile seat and the tile frame; a through hole is arranged on the side of the tile seat close to the worm wheel to ensure that the worm can mesh with the worm wheel.

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