Outer cylinder assembly structure and welding joint for dual-cylinder shock absorber

Abstract

The invention discloses an outer cylinder assembly structure and welding joint for a dual-cylinder shock absorber; the outer cylinder assembly structure is composed of an outer cylinder part and a bottom cover part welded together, the wall thickness of the outer cylinder part is no more than 1.5 mm, the bottom cover part is provided with an outer cylindrical surface matched with the outer cylinder part, and the length of the outer cylindrical surface is no more than 5 mm. a welding joint employing melting and no pressure-welding is adopted between the bottom cover part and the outer cylinder part, the melting adopts the currently-newest low-cost and efficient welding technique, namely the pulse electric arc welding with speed of 1m / min, dual argon tungsten-arc welding or dual-wire welding; compared with the traditional welding joint which adopts resistance seam welding and is between the bottom cover and outer cylinder parts of the dual-cylinder shock absorber, the shock absorber can reduce the material quantity and the dead weight, and accordingly facilitates reducing the product cost and realizing better finished vehicle performance.

Description

Technical field: [0001] The invention relates to a shock absorber in the field of automobile engineering, in particular to an outer cylinder assembly structure of a double-tube shock absorber with fusion welding joints. Background technique: [0002] The automobile industry is a traditional industry with a long history, large-scale production, and relatively mature. The production of its parts must be fast and efficient. Because of this feature, although changes in classic designs have great economic value, some Part design with a long history is still the norm within the industry. Because cross-field or even cross-industry expertise such as automotive engineering, production technology, and automatic control must be proficient, it is extremely difficult to find out whether some classic designs have become obsolete designs that do not conform to the current state of development of related technologies, such as automobile shock absorbers. [0003] Shock absorber is a kind of...

AI Technical Summary

Problems solved by technology

However, since the bottom of the cylinder formed in this way needs to bear a large force during work, the wall thickness of the outer cylinder cannot be too thin, that is, the wall thickness of the outer cylinder in this technology is generally between 1.5 mm and 2 mm, so that The scope of application of this technology is quite limited

[0013] For the welding between the outer cylinder and the bottom cover of the double-tube shock absorber, laser welding or electron beam and other high-energy-density fusion welding can greatly improve the welding speed and welding productivity between the outer cylinder of the shock absorber and the bottom cover, but due to this The similar welding process is complicated and the equipment investment cost is high, so this does not match the low-cost production purpose of the double-tube shock absorber, and it is not recommended

[0014] Plasma welding is also usually classified as high-energy-density welding, but plasma welding has the advantages of fast and high efficiency only when perforation occurs, and the formation and disappearance of perforation are critical for hydraulic shock absorbers, which have strict sealing requirements. Crucially, the welding process is very difficult, so it is not recommended for the production of double-tube shock absorbers

Images