Connection structure of lower steering shaft and upper steering shaft of automobile

Abstract

The invention discloses a motor steering lower shaft and steering upper shaft connecting structure which comprises an upper universal joint fork in key connection with a steering upper shaft, a shaft coupling sheet welded with a steering lower shaft, a rubber disc, a bolt, a middle universal joint fork and a universal joint pin. The upper end of the steering lower shaft is provided with a locating pin, the shaft coupling sheet is riveted with the rubber disc through a rivet, a process hole bringing convenience to bolt assembling is formed in the shaft coupling sheet, a lower gasket matched with the lower surface of the rubber disc is welded to the rod portion of the bolt, the rubber disc is connected with the middle universal joint fork through cooperation of the bolt, the lower gasket, an upper gasket located between the rubber disc and the middle universal joint fork, an elastic gasket and a locking nut, and the middle universal joint fork is connected with the upper universal joint fork through the universal joint pin. The process hole is an arc-shaped process notch formed in the edge of the shaft coupling sheet, and the difference of the diameter of the lower gasket and the diameter of the arc-shaped process notch is larger than zero and smaller than or equal to 3 mm. According to the motor steering lower shaft and steering upper shaft connecting structure, the bolt can be prevented from taking off and falling from the rubber disc after bolt looseness, and torque transmission failures are avoided.

Description

technical field [0001] The invention belongs to the field of automobile steering systems, in particular to a connection structure of a lower steering shaft and an upper steering shaft of an automobile. Background technique [0002] The upper steering shaft, the lower steering shaft and the connection structure between them are important components of the steering mechanism of the vehicle, and its main function is to transmit the steering torque. [0003] The patent application with publication number CN102673633A discloses a steering lower transmission shaft assembly, which includes a lower universal joint fork, a universal joint fork for a shaft, a lower transmission shaft with a positioning pin (equivalent to the lower steering shaft), a coupling shaft plate (with a process hole for convenient bolt assembly), universal cross shaft, upper universal joint fork and middle universal joint fork, the lower universal joint fork is connected with the shaft universal joint fork, an...

AI Technical Summary

Problems solved by technology

[0004] This structure will have the following problems: (1) If the diameter of the lower washer welded to the bolt shank is smaller than the diameter of the process hole on the coupling, after the bolt is loosened, the bolt will come out of the rubber disc and fall, resulting in torque transmission Failure; (2) When the flange face lock nut is tightened and locked on the bolt, it is in direct contact with the rubber disc, and the locking degree of the flange face lock nut is limited, which cannot effectively prevent the nut from loosening ; (3) The positioning pin of the lower transmission shaft belt only cooperates with the rubber positioning sleeve. After the bolt is loose and dropped or the rubber disc is damaged, the torque cannot be properly transmitted, and the effectiveness of torque transmission is not high.

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