Bolt-nut mechanism

Abstract

Clearance can be secured, the thrust of a bolt provided with a left-hand external screw thread is stabilized and the costs of component members are reduced in attaching a steering member to a body frame. A bolt-and-nut fastening mechanism includes a right-hand bolt 4 provided with a metal-to-metal contact locking mechanism 7 on a threaded part, a left-hand bolt 5 provided with an internal screw thread with which the bolt engages, and a fixing nut 6 capable of engaging with the left-hand screw thread of the left-hand bolt 5 or a member 14 provided with an internal screw thread with which the left-hand screw thread of the left-hand bolt 5 engages. The locking mechanism of the bolt thrusts the left-hand bolt forward so that the gap between the top surface of the head of the left-hand bolt and an inner panel is narrowed, and the head of the left-hand bolt comes into contact with the inner panel to define a clearance between a body frame and the bracket of a steering member. The bolt is screwed into the left-hand bolt and the base surface of the bolt comes into contact with an outer panel to produce a fastening force. The fastening force is transmitted through the left-hand bolt to attach the steering member. A welded nut may be omitted and an internal screw thread with which the left-hand bolt engages may be formed in the bracket of the steering member.

Description

technical field [0001] The invention relates to a bolt and nut mechanism for installing modular assemblies such as steering components on a vehicle frame. Background technique [0002] When mounting the steering member as a modular assembly on the vehicle frame, there is a gap (space) 110 between the steering member and the vehicle frame, and the steering member is mounted on the vehicle frame so as to absorb the gap 110 . [0003] In Patent Document 1, such as Figure 11 to Figure 13 As shown, the bolt and nut mechanism has: a nut 120 that has an internal reverse thread 125 and an internal positive thread 126 with a diameter smaller than the internal reverse thread 125 and is welded on the steering member 117; There is a bushing 119 with an external negative thread 124 and an internal positive thread 123 on the inside; an external positive thread 122 that can be screwed on the internal positive thread 123 of the bushing 119, and can be inserted from the insertion hole of th...

AI Technical Summary

Problems solved by technology

However, it is difficult to weld and fix the nut 120 to aluminum alloy or magnesium alloy, so there is a problem that weight reduction cannot be achieved.

[0016] In addition, when electrically grounding the vehicle frame from a modular assembly such as the steering member 117, it is necessary to separately provide a ground terminal on the modular assembly, peel off the paint film of the vehicle frame, and use bolts or the like to electrically ground the ground. There is a problem of troublesome grounding connection between the terminal and the frame

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