Worm gear and worm brake

Abstract

The invention belongs to the technical field of electric supporting rods, and provides a worm gear and worm brake. The worm gear and worm brake comprises a motor worm assembly, a worm gear, a brake pushing assembly, a friction assembly, a spring and a shell, the motor worm assembly is connected with the worm gear in a self-locking mode, the worm gear is connected with the brake pushing assembly, the friction assembly is arranged between the brake pushing assembly and the spring, one end of the spring is connected with the shell, and the other end of the spring is connected with the friction assembly. The worm gear and worm brake has the advantages that the torque of the brake can be adjusted by controlling a motor worm gear and worm mechanism through an ECU according to different working conditions; according to the worm gear and worm self-locking principle, after the ECU adjusts the torque of the brake, the torque value can be maintained under the power-off condition; the internal resistance in the electric supporting rod / driving mechanism is adjustable, and when the worm gear and worm brake is assembled on the whole vehicle, the functions of electric / manual opening and closing, hovering and the like of a vehicle door under various working conditions are met; and when the brake works, the brake adjustment is rapid, the response is fast, and the noise is low during operation.

Description

technical field [0001] The invention belongs to the technical field of electric struts, and relates to a worm gear brake. Background technique [0002] With the development of automobile automation and intelligence, the demand for automatic door opening and closing mechanisms of automobiles is increasing, which greatly improves the user's car experience and enhances the convenience of users. The mechanism has high practicability, realizes the automatic opening and closing of the car door, and is convenient for people to travel. However, due to the influence factors of slope / temperature / door opening angle, the hovering function of the door cannot be guaranteed under reasonable limit conditions, or when the door is manually opened and closed under different conditions, a very light manual operation force is required. Therefore, it is necessary to add an adjustable brake to the driving mechanism. During the whole process of opening and closing the door, it is controlled by the...

AI Technical Summary

Problems solved by technology

However, due to the influence factors of slope / temperature / door opening angle, the hovering function of the door cannot be guaranteed under reasonable extreme working conditions, or when the door is manually opened and closed under different working conditions, a very light manual operation force is required

Therefore, it is necessary to add an adjustable brake to the driving mechanism. During the whole process of opening and closing the door, it is controlled by the ECU to automatically change the internal resistance of the mechanism, so as to realize the hovering of the door under various working conditions and the appropriate manual force for opening and closing the door. The braking torque of the brake in the rod / drive mechanism is usually a fixed value and cannot be adjusted, resulting in a constant and non-adjustable internal resistance of the electric strut / drive mechanism, which leads to the limit working conditions ( Such as uphill, downhill, side slope, etc.) are prone to abnormal opening and closing of the door. The conventional brake structure is an electromagnetic brake, usually in the form of: power-on brake, power-off brake, both of which are not only in the same size, Generates a smaller torque value

The disadvantages of the other two brakes are also more obvious. Power-on braking: continuous power-on is required to generate braking, and the current is large, greater than 0.5A; power-off braking: although it can generate braking without power-on , but in the process of electric opening and closing, it needs to be powered continuously to cancel its braking function

Both situations cause great waste to the power supply of the whole vehicle, and it is easy to cause battery loss. At the same time, long-term power supply causes the wire to heat up quickly, which is easy to cause major accidents such as fire, and even some electric struts / drive mechanisms on the market do not have brakes. As a result, at room temperature, the door can only hover at various angles in the flat slope state. When going up and downhill at room temperature, there will be abnormal situations such as the door rebounding / falling at a large angle, which will seriously affect the electric / manual opening and closing of the door, and it is easy to cause the door to fall / rebound. Injury to users and other abnormal conditions

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