New multi-line composited thread-form thread

Abstract

Provided is a new multi-line composited thread-form thread. The new multi-line composited thread-form thread is provided with a body, wherein a thread body formed by multiple spiral lines distributed in an equal distance mode is processed on the axial outer circumferential wall of the body, thread forms formed by the spiral lines are not completely identical, and improvement the connecting strength or driving precision of the body and a matched part is achieved after the body is screwed with the matched part identical to the body in spiral line thread form. The thread formed by the multiple spiral lines arranged on the axial outer circumferential wall of the body is not completely identical in thread form and is uniformly distributed, the phenomenon that a threaded connecting part loosens in the usage process is effectively avoided, the connecting strength or driving precision of the threaded connecting part are greatly improved, the new multi-line composited thread-form thread is simple in structure and free of idle stroke phenomena, and the threaded connecting part is strong in bearing capability.

Description

technical field [0001] The invention relates to a novel multi-thread composite thread. Background technique [0002] Both threaded connection and screw transmission use threaded parts to work. Threaded connection has the advantages of easy installation, convenient disassembly, high degree of standardization, strong interchangeability, and simple operation. It is the most widely used detachable connection; screw transmission is a It is a transmission form that changes rotary motion into linear motion. The characteristic of threaded connection is that it can generate a large axial force when the thread is tightened. It can easily realize self-locking and small size; , easy to loosen; the strength of the threaded connection is mainly determined by the strength of the bolt. After the bolted connection is loaded, the load is transmitted through the threaded surface of the bolt and the nut. Due to the different stiffness and deformation properties of the bolt and the nut, the scre...

AI Technical Summary

Problems solved by technology

[0002] Both threaded connection and screw transmission use threaded parts to work. Threaded connection has the advantages of easy installation, convenient disassembly, high degree of standardization, strong interchangeability, and simple operation. It is the most widely used detachable connection; screw transmission is a It is a transmission form that changes rotary motion into linear motion. The characteristic of threaded connection is that it can generate a large axial force when the thread is tightened. It can easily realize self-locking and small size; , easy to loosen; the strength of the threaded connection is mainly determined by the strength of the bolt. After the bolted connection is loaded, the load is transmitted through the threaded surface of the bolt and the nut. Due to the different stiffness and deformation properties of the bolt and the nut, the screwing occurs The phenomenon of uneven force on the thread teeth of each circle affects the strength of the bolt; the screw drive uses a screw pair composed of a screw and a nut to meet the transmission requirements, and is mainly used to change the rotary motion into a linear motion. The screw drive can be divided according to the friction properties. There are sliding screw, rolling screw and static pressure screw. There is always a gap in the sliding screw, and the gap will increase after wear. The friction structure is complicated, and the screw of the static pressure screw is an ordinary trapezoidal thread screw. In this structure, the nut structure is complicated, the processing, installation and adjustment are difficult, and it cannot be self-locking. A set of oil supply device is required; thread connection and thread transmission are commonly used There are three types of teeth, triangle, rectangle, trapezoid

Each tooth type has its own advantages and disadvantages. The traditional thread, whether it is single thread or multi-thread, uses one tooth type, so there will be problems such as looseness, difficulty in repairing after wear, or decline in transmission accuracy during use; and After the threaded connection is loaded, the load is transmitted through the threaded surface of the bolt and the nut. Because the stiffness and deformation of the bolt and the nut are different, the load distribution of the screwed threads is uneven. During the loading process, The screw is stretched, the pitch increases, the nut is compressed, the pitch decreases, and the two are always screwed together, so the difference in pitch is mainly compensated by the deformation of the thread teeth of each circle, and thick nuts are used 1. Excessively increasing the number of screwing turns has little effect on improving the connection strength; in threaded connection and screw transmission, under the action of alternating load, the state of the threaded fastening changes, and there is a loose state, which affects the threaded connection. Strength and transmission progress, in summary, it is necessary to improve

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