Linear actuator

Abstract

The invention discloses a linear actuator, and belongs to the technical field of linear actuation. The linear actuator comprises a driving part, a screw rod which rotates under the driving of the driving part, a transmission nut which is sleeved on the screw rod and moves along the axial direction of the screw rod, and a safety nut which is sleeved on the screw rod and synchronously moves along with the transmission nut, wherein an axial reserved distance is reserved between the safety nut and the transmission nut, and an axial limiting portion for controlling the axial reserved distance is arranged between the safety nut and the transmission nut; when the transmission nut is damaged, the axial limiting portion is damaged under the heavy load so that the transmission nut can tightly press the safety nut, and in the assembling process, the safety nut only needs to be screwed to the axial limiting portion; therefore, the installation position of the safety nut can be well positioned, the proper reserved distance is achieved, the safety nut is prevented from being attached to the transmission nut, the assembly precision and accuracy are guaranteed, rework, disassembly and assembly are avoided, the assembly time is saved, and the assembly efficiency is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of linear actuation, in particular to a linear actuator. 【Background technique】 [0002] Linear actuators are currently widely used in various fields, including medical equipment, home office, solar power generation and so on. The structure of this linear actuator usually includes a driving motor, a driving screw, a worm wheel, and a driving nut. The driving motor drives the rotating screw to rotate, and when the rotating screw rotates, it drives the driving nut to move axially. achieve the driving purpose. [0003] The transmission nut is generally made of plastic nut, which will be damaged due to abnormal wear and material defects during use, which will lead to a sudden drop, which is very dangerous. In order to improve the safety performance during use, many linear actuators have safety devices installed in the transmission nut. The setting of the nut and the safety nut is not to keep the push rod run...

AI Technical Summary

Problems solved by technology

[0004] In addition, in linear actuators, bearings are usually used to achieve relative rotation in the circumferential direction and to transmit torque. The fit gap between them is difficult to control. If the fit gap is too large, the bearing will be easily deflected after installation, or if the fit gap is too small, the bearing will not be installed at all. These two situations will cause the positioning accuracy of the bearing to be greatly reduced or the positioning function will be lost. The dimensional accuracy of the products is difficult to control, and the mold is very difficult, requiring repeated mold repairs, which increases the cost of time and money

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