Linear Actuator and Its Buffer Mechanism

Abstract

The invention discloses a linear actuator and its buffer mechanism. The linear actuator includes a gear box, a motor structure, a lead screw, a telescopic tube, a quick-release mechanism, and a buffer mechanism. The motor structure is connected to the gear box; a part of the lead screw accommodates Another part protrudes from the gear box; the telescopic tube has a nut screwed with the lead screw for transmission; the quick release mechanism is accommodated in the gear box, and the quick release mechanism includes a cylindrical connection part and a worm gear member sleeved on the lead screw , the cylindrical connecting part rotates with the lead screw, the worm gear is driven by the motor structure and can selectively generate clutch corresponding to the cylindrical connecting part; the buffer mechanism is sleeved on the outer periphery of the lead screw and interposed between the nut and the gear box . In this way, the impact force generated by the telescopic tube during its rapid descent can be absorbed.

Description

technical field [0001] The invention relates to a linear actuator, in particular to a linear actuator and a buffer mechanism thereof. Background technique [0002] It is quite common and widely accepted to install linear actuators (Linear Actuator) on electric hospital beds, treadmills, wheelchairs, etc. to adjust the height of the position or the size of the elevation angle; During emergency treatment, a quick release mechanism is usually used to quickly release the actuating device, so that the hospital bed can be quickly adjusted and changed to gain the most precious golden rescue time, but in the process of quick release, Also because the impact produced by the fast fall is very likely to cause possible injury to the patient, how to provide a buffer before the fast fall stops is the main subject of the present invention. [0003] The current linear actuator mainly includes a motor, a transmission mechanism and a quick release mechanism. The motor has a worm, and the tra...

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Problems solved by technology

[0004] However, the current linear actuator still has the following problems in actual use, because it is to provide a cushioning function by installing an additional air pressure rod next to the linear actuator, but adding an air pressure rod will make the hospital bed The complex structure also increases the manufacturing cost

In addition, the impact force generated under the action of the acceleration of gravity is often far greater than the load that the air rod can bear, which not only easily damages the air rod, but also lacks comprehensive protection for patients, which needs to be overcome urgently.

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