Electric steering device transmission for rear-view mirror of car

Abstract

An electric driver for controlling the back-view mirror is aimed at reducing idle running and noise and benefiting manual regulation, and has a rack bar which is fixed to spherical sleeve and engaged with the top gear of output axle assemblage. It features that the output axle assemblage behind the speed variator of electric motor has a friction sliding mechanism. Its advantages are short idle running, low noise, smooth rotation and not jamming easily.

Description

technical field [0001] The invention relates to the technical field of an electric steering gear transmission device for an automobile rearview mirror. Background technique [0002] The electric steering gear of the automobile rearview mirror is installed and fixed in the rearview mirror housing to adjust the angle of the mirror. The driver can easily adjust the field of view according to his own driving habits while sitting in the cab. The electric steering used in domestic automobiles The gears are all imported from abroad. Imported products generally adopt two kinds of worm gear transmission or planetary gear transmission. The disadvantage of the worm gear transmission method is that it will make a lot of noise when it is at the extreme position such as the end or top, and it is difficult to manually adjust. The planetary gear transmission The disadvantage of the method is that the air travel is large and the noise is large. Some foreign advanced developed countries also...

AI Technical Summary

Problems solved by technology

[0002] The electric steering gear of the automobile rearview mirror is installed and fixed in the rearview mirror housing to adjust the angle of the mirror. The driver can easily adjust the field of view according to his own driving habits while sitting in the cab. The electric steering used in domestic automobiles The gears are all imported from abroad. Imported products generally adopt two kinds of worm gear transmission or planetary gear transmission. The disadvantage of the worm gear transmission method is that it will make a lot of noise when it is at the extreme position such as the end or top, and it is difficult to manually adjust. The planetary gear transmission The disadvantage of the method is that the air travel is large and the noise is large

Some foreign advanced developed countries also have certain reports on the transmission mechanism technology of the electric steering gear of the automobile rearview mirror. For example, the U.S. patent "automotive mirror adjustment gear device" with the patent No. Mechanism, in order to avoid the jamming phenomenon at the limit position, its structure is such that the output shaft of the motor adopts a worm, which meshes with the worm wheel, and the worm wheel is integrated with another worm, and the worm is meshed with another worm wheel, and at the same time The worm wheel becomes the friction driving wheel again, and is connected to the friction driven wheel sleeved on the shaft through the end face bonding. The friction driven wheel and the gear are connected as one, and the gear is meshed with the rack. There is an elastic element between one end surface and the bracket, so that there is a certain friction force between the friction driving wheel and the friction driven wheel, but its elastic element is in the form of an elastic sheet, so its friction and slipping mechanism is non-adjustable. Fixed dead, it works in theory, but in practice there are great disadvantages, even can not be used, such as the elastic mechanism is fixed, the elastic piece at the back keeps the friction between the friction wheels, but we want Note that the transmission components are made of plastic or metal parts, especially the use area of ​​the car is very wide, the temperature span is very large, from -40 degrees to +50 degrees, so the thermal expansion and contraction are not the same, causing friction The force is not the same, even the gap between the friction wheels is too large and it is separated or pushed too hard, so that the slipping mechanism cannot work; the elastic piece is directly supported between the end face of the friction driving wheel and the bracket, so when the friction driving wheel rotates When it is used, it will rotate relative to the elastic piece, resulting in a large friction force, resulting in a large transmission consumption, short service life of the motor, high noise, unstable transmission and other shortcomings; adjustment is difficult, and the correct design torque requirement cannot be achieved. Either too big or too small, quality control is difficult

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