Ratchet mechanism, design method and screw drill

By setting ratchets composed of gradually high lines, straight lines and arcs in the inner hole of the ratchet mechanism, and designing the slide rod shape to be similar to a parallelogram, the problem that the ratchet mechanism in the prior art is difficult to prevent rotor reversal and contact wear in a narrow space, and the effects of small contact stress, small wear and long life are achieved.

CN119712738APending Publication Date: 2025-03-28KINGDREAM PLC CO +1
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Patent Information

Application Number
CN202510117883.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing ratchet mechanism is difficult to effectively prevent the rotor from reversing in a narrow space, and the contact area between the slider and the stator is small, resulting in large contact stress, severe wear and short life.

Method used

A ratchet mechanism is designed to set ratchets composed of progressively high lines, straight segments and arcs in the inner hole of the stator, and design the shape of the slider to be similar to a parallelogram, increasing the contact area between the long side of the slider and the straight segment of the stator to ensure that the rotor can be effectively blocked when reverse rotation.

Benefits of technology

In the narrow space with thin-walled stator and short tooth height, the contact stress between the slider and the stator is small, the wear is small, and the life is long, while effectively preventing the rotor from reversing.

✦ Generated by Eureka AI based on patent content.
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Abstract

The invention relates to a ratchet mechanism, a design method and a screw drill, and belongs to the technical field of drilling equipment.The ratchet mechanism comprises a quadrangular sliding rod, the shape of the sliding rod is similar to a parallelogram, two long sides of the sliding rod are two parallel straight lines, and two short sides of the sliding rod are special curves; contact points of the sliding rods are two end points of the long diagonal line. Therefore, the contact area between the long edge of the sliding rod and the linear section of the stator is increased, and even if the tooth height of the inner hole of the stator is very low, the sliding rod can be blocked to prevent the rotor from rotating reversely. And the contact point and the long edge of the end part of the sliding rod can be propped against the linear section together, the backstop effect of reverse rotation is good, and the length of the linear section can be designed to be shorter, so that the stator tooth height is shorter and the wall thickness is thinner, and therefore, the stator is more suitable for being arranged in a narrow space and is conveniently applied to a screw drill. And meanwhile, the contact surface between the end part of the sliding rod and the gradually-heightened line on the stator can be increased, so that the contact stress is reduced, the generated friction force is reduced, the abrasion is small, and the service life is long.
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