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CN-121993585-A - Overrunning clutch based on worm and gear

CN121993585ACN 121993585 ACN121993585 ACN 121993585ACN-121993585-A

Abstract

The invention provides an overrunning clutch based on worm wheels and worms, which adopts the technical scheme that the overrunning clutch comprises worm wheels and worms, wherein a side gap is reserved between the worm wheels and the worms; the fixed shaft gear transmission mechanism with pretightening force is connected between the worm wheel and the worm and can be used for realizing reverse driving and eliminating transmission gaps between the worm wheel and the worm. The invention utilizes the worm gear and the fixed shaft gear transmission mechanism with pretightening force to realize high-load transmission of the overrunning clutch and improve transmission precision.

Inventors

  • ZHOU ZHIKUN

Assignees

  • 周智坤

Dates

Publication Date
20260508
Application Date
20260123

Claims (10)

  1. 1. An overrunning clutch based on worm and gear, characterized by comprising: The worm gear comprises a worm wheel (1) and a worm (2), wherein a side gap is reserved between the worm wheel (1) and the worm (2); The fixed shaft gear transmission mechanism (3) with pretightening force is connected between the worm wheel (1) and the worm (2) and can be used for realizing reverse driving and eliminating transmission gaps between the worm wheels (1) and the worm (2).
  2. 2. The overrunning clutch based on worm and gear according to claim 1, characterized in that the fixed-axis gear transmission mechanism (3) with pretightening force generates pretightening force by a spring.
  3. 3. The worm and gear-based overrunning clutch of claim 2, wherein the spring is a cylindrical spiral spring or a torsion spring.
  4. 4. The overrunning clutch based on the worm and gear according to claim 1, wherein the fixed-axis gear transmission mechanism (3) with pretightening force is driven by a bevel gear pair and a cylindrical gear pair in a combined way.
  5. 5. The overrunning clutch based on the worm and gear according to claim 1, wherein the fixed-axis gear transmission mechanism (3) with the pretightening force is further provided with an elastic steering mechanism capable of changing the pretightening force direction.
  6. 6. The overrunning clutch based on worm and gear according to claim 5, wherein the elastic steering mechanism is a knob (32) with an eccentric shaft.
  7. 7. The worm and gear-based overrunning clutch as claimed in claim 5, wherein the spring force direction changing mechanism is a paddle (32A) with a bearing.
  8. 8. The overrunning clutch based on worm and gear according to claim 1 or 5, characterized in that the fixed shaft gear transmission mechanism (3) with pretightening force is further provided with a limiting structure capable of limiting the pretightening force action stroke.
  9. 9. The worm and gear-based overrunning clutch of claim 7, wherein the limit structure is a limit stop.
  10. 10. A worm and gear based overrunning clutch according to claim 1 or 5 or 8, characterized in that the worm (2) is configured as one or more.

Description

Overrunning clutch based on worm and gear Technical Field The invention relates to the technical field of mechanical transmission systems, in particular to an overrunning clutch. Background The overrunning clutch belongs to basic elements in a mechanical transmission system, and is mainly divided into three basic types of ratchet type, roller type and wedge type, and has wide application in the fields of automobiles, aviation, automatic machines, energy sources and the like. The existing ratchet type overrun clutch has idle stroke caused by the need of reserving a meshing gap due to a rigid meshing structure, and has low transmission precision. The existing wedge type and roller type overrunning clutch respectively utilizes the wedge effect and the extrusion and release of the rollers to realize the functions. The two working modes can lead to the defects of small load capacity, overlarge stress at the contact part with the wedge block or the roller, easy contact fatigue and pitting corrosion, and high requirements on manufacturing precision and material wear resistance. Accordingly, there is a need in the art for a new overrunning clutch solution that overcomes at least one of the shortcomings described above. Disclosure of Invention The technical problems to be solved are as follows: The invention mainly aims to provide an overrun clutch based on a worm gear and a worm so as to solve the defects that the existing ratchet type overrun clutch has idle stroke, low precision, small load capacity of wedge type overrun clutches and rollers type overrun clutches and the like. The technical scheme is as follows: in the present application, the term "reverse driving" refers to a driving mode in which a worm wheel is used as a driving member to drive a worm to rotate around a shaft thereof according to a transmission ratio and a transmission direction of the worm wheel to the worm by driving other mechanisms. An overrunning clutch based on worm and gear, characterized by comprising: The worm gear and the worm are provided with a side gap; The fixed shaft gear transmission mechanism with pretightening force is connected between the worm wheel and the worm and can be used for realizing reverse driving and eliminating transmission gaps between the worm wheel and the worm. Optionally, the fixed shaft gear transmission mechanism with the pretightening force generates pretightening force by a spring. Optionally, the spring in the fixed shaft gear transmission mechanism with the pretightening force is a cylindrical spiral spring or a torsion spring. Optionally, the fixed shaft gear transmission mechanism with the pretightening force generates pretightening force by elastic materials. Optionally, the elastic material in the fixed shaft gear transmission mechanism with the pretightening force is elastic rubber or elastic plastic. Optionally, the transmission part of the fixed shaft gear transmission mechanism with the pretightening force is combined transmission of a bevel gear pair and a cylindrical gear pair. Furthermore, the fixed shaft gear transmission mechanism with the pretightening force is provided with an elastic turning mechanism for changing the pretightening force direction, so that the overrunning clutch can change the force transmission direction. Optionally, the elastic steering mechanism is a knob with an eccentric connection structure. Optionally, the elastic steering mechanism is a pulling piece with a bearing. Further, the fixed shaft gear transmission mechanism with the pretightening force is provided with a limiting structure for limiting the acting stroke of the pretightening force and preventing the worm gear from being locked in the overrunning stage. Optionally, the limiting structure is a limiting stop. Further, the number of the worm shafts can be one or more, and the increase of the number of the worm shafts can increase the load capacity of the overrunning clutch. The beneficial effects are that: Compared with the existing ratchet type overrun clutch, the invention utilizes the backlash eliminating function of the fixed shaft gear transmission mechanism with pretightening force, so that in the normal working state of the invention, the worm wheel and the worm can be contacted in both the overrun stage and the force transmission stage, thereby greatly avoiding idle stroke in transmission and improving transmission precision. Compared with the existing wedge type and roller type overrunning clutch, the invention utilizes a worm gear structure, and a plurality of worms can be matched with one worm gear, so that the load capacity of the invention is stronger than that of the wedge type and roller type overrunning clutch. The invention has simple reversing mode, and can easily select the reversing scheme and the non-reversing scheme, thereby having wider application range. Drawings In the following drawings, like reference numerals designate like or similar elements throughout the several views, and