Reduction gearbox of electric dental wrench

Abstract

The utility model relates to a reduction gearbox of an electric dental wrench, which comprises a barrel, a connecting nut, an output connector, an outer gear ring, a first planet carrier, a second planet carrier, a plurality of first planet gears, a plurality of second planet gears, a sun gear, an output shaft and an output bevel gear. The multiple first planetary gears are rotationally arranged on the bottom face of the first planet carrier and meshed with teeth of the outer gear ring at the same time, the sun gear is fixedly connected to the top face of the first planet carrier, the multiple second planetary gears are rotationally arranged on the bottom face of the second planet carrier and meshed with the multiple second planetary gears at the same time, and the sun gear is fixedly connected to the top face of the second planet carrier. The multiple second planetary gears are meshed with teeth of the outer gear ring at the same time, the inner end of the output shaft is fixedly connected with the second planet carrier, the outer end of the output shaft extends out of the output connector, and the output bevel gear is arranged at the outer end of the output shaft. The two-layer planetary speed reducing mechanism is adopted, and the speed reducing effect is good.

Description

Technical Field

[0001] The utility model relates to the technical field of electric dental wrenches, in particular to a reduction box of the electric dental wrench. Background Art

[0002] Electric dental torque wrenches are used in dental preoperative planning, implant placement, and repair processes. During surgery, torque wrenches are often used to tighten and remove covering screws or healing abutments. Electric dental wrenches use motors and reducers to reduce speed and increase torque. However, the reducers of existing electric dental wrenches have complex structures and poor reduction effects. Summary of the invention

[0003] The utility model aims to provide a reduction box for an electric dental wrench with a simple structure and good reduction effect.

[0004] The purpose of the utility model is achieved in this way:

[0005] A reduction box for an electric dental wrench comprises a cylinder, a connecting nut, an output joint, an outer gear ring, a first planetary carrier, a second planetary carrier, a plurality of first planetary gears, a plurality of second planetary gears, a sun gear, an output shaft and an output bevel gear, wherein both ends of the cylinder are open, a connecting nut and an output joint are respectively arranged at both ends of the cylinder, the outer gear ring is fixed in the cylinder, the first planetary carrier and the second planetary carrier are rotatably arranged in the outer gear ring, a plurality of first planetary gears are rotatably arranged on the bottom surface of the first planetary carrier, a plurality of first planetary gears are simultaneously meshed with the teeth of the outer gear ring, a sun gear is fixedly connected to the top surface of the first planetary carrier, a plurality of second planetary gears are rotatably arranged on the bottom surface of the second planetary carrier, a sun gear is simultaneously meshed with a plurality of second planetary gears, a plurality of second planetary gears are simultaneously meshed with the teeth of the outer gear ring, an output shaft is rotatably arranged on the output joint, an inner end of the output shaft is fixedly connected to the second planetary carrier, an outer end of the output shaft extends out of the output joint, and an output bevel gear is arranged at the outer end of the output shaft. The utility model adopts a two-layer planetary reduction mechanism, has a good reduction effect, and the reduction ratio of the utility model can reach 20:1 or 16:1.

[0006] The present invention can also be further improved as follows.

[0007] The outer side wall of the connecting nut and the outer side wall of the output connector are respectively threadedly connected to the two ends of the cylinder.

[0008] The inner side wall of the cylinder is provided with a positioning convex ring, one end of the outer gear ring abuts against the positioning convex ring, and the connecting nut abuts against the other end of the outer gear ring.

[0009] The utility model also comprises a wear-resistant sheet, which is arranged between the first planetary gear and the connecting nut.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model adopts a two-layer planetary reduction mechanism, which has a good reduction effect. The reduction ratio of the utility model can reach 20:1 or 16:1. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the structure of a reduction box of an electric dental wrench.

[0013] Figure 2 It is a structural schematic diagram of the reduction box of the electric dental wrench of the utility model from another angle.

[0014] Figure 3 It is a top view of the gear box of the present utility model.

[0015] Figure 4 yes Figure 3 Cross-sectional view at AA in the middle.

[0016] Figure 5 The utility model is an exploded view of a reduction box of an electric dental wrench. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Embodiment 1, as Figures 1 to 5 As shown, a reduction gearbox of an electric dental wrench includes a barrel 7, a connecting nut 13, an output joint 3, an outer gear ring 8, a wear-resistant sheet 12, a first planet carrier 10, a second planet carrier 6, a plurality of first planetary gears 11, a plurality of second planetary gears 9, a sun gear 14, an output shaft 5 and an output bevel gear 1. Both ends of the barrel 7 are open, the connecting nut 13 and the output joint 3 are respectively arranged at both ends of the barrel 7, the outer gear ring 8 is fixed in the barrel 7, the first planet carrier 10 and the second planet carrier 6 are rotatably arranged in the outer gear ring 8, and the plurality of first planetary gears 11 are rotatably arranged in the first On the bottom surface of a planet carrier 10, multiple first planetary gears 11 are simultaneously meshed with the teeth of the outer gear ring 8, a sun gear 14 is fixedly connected to the top surface of the first planet carrier 10, multiple second planetary gears 9 are rotatably arranged on the bottom surface of the second planet carrier 6, the sun gear 14 is simultaneously meshed with the multiple second planetary gears 9, and multiple second planetary gears 9 are simultaneously meshed with the teeth of the outer gear ring 8, an output shaft 5 is rotatably arranged on the output joint 3, the inner end of the output shaft 5 is fixedly connected to the second planet carrier 6, the outer end of the output shaft 5 extends out of the output joint 3, and an output bevel gear 1 is arranged at the outer end of the output shaft 5.

[0019] As a more specific technical solution of the utility model.

[0020] The outer side wall of the connecting nut 13 and the outer side wall of the output connector 3 are respectively threadedly connected to the two ends of the cylinder 7 .

[0021] The inner wall of the cylinder 7 is provided with a positioning protruding ring 15 , one end of the outer gear ring 8 abuts against the positioning protruding ring 15 , and the connecting nut 13 abuts against the other end of the outer gear ring 8 .

[0022] The wear-resistant sheet 12 is disposed between the first planetary gear 11 and the connecting nut 13 .

[0023] The motor of the electric dental wrench is provided with a driving gear 16, the motor shaft extends into the barrel 7, the motor shaft passes through the connecting nut 13, the driving gear 16 is meshed with multiple first planetary gears 11 at the same time, the motor drives the driving gear to rotate, the driving gear rotation drives the multiple first planetary gears 11 to rotate, the first planetary gears 11 rotate and drive the first planetary carrier 10 and the sun gear 14 to rotate, to achieve a first-stage reduction, the sun gear 14 rotates and drives the multiple second planetary gears 9 to rotate, the second planetary gears 9 rotate and drive the second planetary carrier 6 and the output shaft 5 to rotate, to achieve a second-stage reduction, the output shaft 5 drives the output bevel gear 1 to rotate, the bevel gear 1 will drive the torque needle rod of the head of the electric dental wrench to rotate.

Claims

1. A reduction box for an electric dental wrench, characterized in that: The invention comprises a cylinder, a connecting nut, a wear-resistant sheet, an output joint, an outer gear ring, a first planet carrier, a second planet carrier, a plurality of first planetary gears, a plurality of second planetary gears, a sun gear, an output shaft and an output bevel gear. Both ends of the cylinder are open. The connecting nut and the output joint are respectively arranged at both ends of the cylinder. The outer gear ring is fixed in the cylinder. The first planet carrier and the second planet carrier are rotatably arranged in the outer gear ring. The plurality of first planetary gears are rotatably arranged on the bottom surface of the first planet carrier. The plurality of first planetary gears are simultaneously meshed with the teeth of the outer gear ring. The sun gear is fixedly connected to the top surface of the first planet carrier. The plurality of second planetary gears are rotatably arranged in the outer gear ring. The sun gear is arranged on the bottom surface of the second planetary carrier, and the sun gear is meshed with multiple second planetary gears at the same time, and multiple second planetary gears are meshed with the teeth of the outer gear ring at the same time. The output shaft is rotatably arranged on the output joint, the inner end of the output shaft is fixedly connected to the second planetary carrier, and the outer end of the output shaft extends out of the output joint. The output bevel gear is arranged on the outer end of the output shaft, and the outer side wall of the connecting nut and the outer side wall of the output joint are respectively threadedly connected to the two ends of the cylinder body, and the inner side wall of the cylinder body is provided with a positioning convex ring, one end of the outer gear ring is abutted against the positioning convex ring, and the connecting nut is abutted against the other end of the outer gear ring, and a wear-resistant sheet is arranged between the first planetary gear and the connecting nut.

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