Steering device and method of manufacturing the same

Abstract

A steering device and a method of manufacturing the steering device. In the steering device, an annular recessed part (73) is formed in the internal surface of the fitting hole (71) of a bracket (7) in which the cylinder tube (53) of a housing storing a steering shaft allowed to move in the lateral direction of a vehicle body according to steering operation and having a metal cylinder tube (53) is inserted. A part of the cylinder tube (53) is bent to the inside of the recessed part (73) starting at the inner peripheral surface toward the outer peripheral surface to form a locking projected part (8) to increase the locking strength of the bracket (7) so that the locking strength of the bracket connected to the cylinder tube can be increased without producing thermal strain in the cylinder tube. Also, parts such as the steering shaft can be installed in the steering device without being obstructed by the bracket.

Description

technical field [0001] The present invention relates to a steering device including a steering drive shaft that can move in left and right directions of a vehicle body in response to a steering operation, and a method for manufacturing the same. Background technique [0002] As one form of a steering device for automobiles, a rack and pinion type steering device is known. The pinion shaft is linked to move along the left and right directions of the car body; the rack housing is used to accommodate and support the rack shaft; the hydraulic cylinder is connected to the piston rod connected to one end of the rack shaft and the piston The piston of the rod is guided and has a cylinder connected to one end of the rack housing; the first and second brackets connect the other end of the rack housing to the front end of the cylinder Installed on the vehicle body, and the oil pressure generated by the hydraulic cylinder assists the action of the steering mechanism corresponding to t...

AI Technical Summary

Problems solved by technology

[0005] As described in Japanese Patent Application Publication No. 3-7070, in a steering device in which the bracket is welded or cast-molded on the cylinder body, the detachment prevention strength of the second bracket can be improved, but due to the welding of the second bracket, the Heat and casting heat will cause thermal deformation in the cylinder, so after the bracket is combined, there is a problem that the inner circumference of the cylinder needs to be reprocessed, thereby increasing the number of processing steps.

In addition, since the inner circumference of the cylinder body needs to be processed after the bracket is combined, it is necessary to combine the bracket in a process before the assembly process of parts such as the steering shaft, so that there are problems when assembling parts such as the steering shaft. Problems with brackets interfering with assembly described above, thus calling for improved strategies

[0006] In addition, in the steering gear combined with the bracket by press-fitting, there is a problem that the same detachment prevention strength as that of the steering gear provided with the detachment-preventing protrusion described in KOKAI Publication No. 3-7070 cannot be obtained. There is a problem that the number of parts increases in the steering device using nut parts

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