一种曲轴对接用膨胀定位螺栓

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By designing expansion positioning bolts for crankshaft docking and adopting a straight section and bushing structure, the problems of large deformation and friction of expansion bolts during disassembly and transportation were solved, achieving the effect of easy disassembly and maintaining mechanical properties.

CN224515605UActive Publication Date: 2026-07-17QINGDAO HAIXI HEAVY IND

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: QINGDAO HAIXI HEAVY IND
Filing Date: 2025-08-06
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Existing expansion bolts are prone to deformation during disassembly and transportation, and have high friction, making them difficult to reuse. This is especially true when the thickness increases, making disassembly more difficult.

Method used

An expansion positioning bolt for crankshaft docking was designed, including a shaft, an expansion sleeve, and a bushing. By adding a straight section and a bushing to replace part of the tapered shaft section and the expansion sleeve, the expansion sleeve slides and expands on the tapered shaft section to achieve positioning. The bushing does not contact the inner wall of the boring hole, reducing deformation and friction.

Benefits of technology

It effectively avoids the deformation and disassembly difficulty of long expansion positioning bolts, maintains mechanical properties, ensures positioning accuracy, and facilitates disassembly.

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Abstract

本实用新型涉及定位件技术领域，特别涉及一种曲轴对接用膨胀定位螺栓，包括轴，从一端至另一端依次设置螺栓头、锥轴段和平直段，所述平直段端部设有螺纹并配合有螺母，所述锥轴段大端毗邻所述螺栓头；胀套，套设在所述锥轴段上，其内孔与所述锥轴段匹配；轴套，套设在所述平直段上，一端抵接所述胀套，另一端抵接所述螺母，所述轴套外径小于所述胀套外径；本实用新型的膨胀定位螺栓通过增设平直段及配合的轴套替代了锥轴段及胀套的部分长度，增设的轴套不与配镗孔内壁接触，使符合两法兰和链轮连接后长度的膨胀定位螺栓能够使胀紧部位保持原有长度，避免了长膨胀定位螺栓全段设置锥轴段及胀套时不易拆卸及变形的问题。

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Claims

1. An expansion dowel bolt for crankshaft butt joining, characterized by, include: A shaft is provided with a bolt head, a tapered shaft section and a straight section in sequence from one end to the other. The straight section is threaded at the end and fitted with a nut. The large end of the tapered shaft section is adjacent to the bolt head. An expansion sleeve is fitted onto the tapered shaft section, and its inner hole matches the tapered shaft section. A bushing is fitted onto the straight section, with one end abutting against the expansion sleeve and the other end abutting against the nut. The outer diameter of the bushing is smaller than the outer diameter of the expansion sleeve.

2. An expansion dowel for a crankshaft butt joint as defined in claim 1 wherein, The length of the expansion sleeve is no greater than the thickness of the two mating flanges, and the contact area between the expansion sleeve and the tapered shaft section is at least 80%.

3. An expansion dowel for a crankshaft butt joint as defined in claim 1 wherein, The expansion sleeve has multiple expansion grooves staggered along its axial direction from both ends.

4. An expansion dowel for a crankshaft butt joint as defined in claim 1 wherein, The expansion sleeve is made of spring steel.

5. An expansion dowel for a crankshaft butt joint as defined in claim 1 wherein, The length of the bushing is greater than the thickness of the flange and the sprocket located at the assembly edge.

6. The expansion positioning bolt for crankshaft mating as described in claim 1, characterized in that, The tapered surface on the tapered shaft section is hardened and polished.