一种具有胀套的螺栓组件
By introducing a wedge groove anti-loosening part and an expansion sleeve structure into the bolt assembly, combined with nylon patches and flat washers, the loosening problem of traditional threaded fasteners in harsh environments is solved, achieving self-locking and stability of preload.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAOXING SHUNXIN FASTENERS CO LTD
- Filing Date
- 2025-10-30
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional threaded fasteners are prone to loosening under vibration, impact, load changes, and corrosive environments. Existing anti-loosening elements cannot provide dual protection of axial elasticity and radial locking.
Design a bolt assembly with an expansion sleeve. The bolt body is provided with a wedge groove anti-retraction part and an expansion sleeve. The expansion sleeve is provided with a support plate and an abutment plate. The wedge structure expands under axial tension to form a frictional clamping force. The outer surface of the support plate has a nylon patch to increase the friction force, and a flat washer is used to disperse the pressure.
It achieves the self-locking effect of bolt assemblies, enhances the anti-loosening effect, maintains stable preload, avoids stress concentration, and adapts to harsh working conditions.
Smart Images
Figure CN224515637U_ABST
Abstract
Claims
1. A bolt assembly having a sleeve, comprising a bolt body, a sleeve and a nut, characterized in that: The expansion sleeve is fitted onto the bolt body, and the nut is threadedly connected to the bolt body. The bolt body includes a threaded connection portion and a wedge groove anti-retraction portion. The wedge groove anti-retraction portion is located on the upper side of the threaded connection portion, and the two are coaxially arranged. Multiple wedge-shaped annular grooves are equally spaced on the wedge groove anti-retraction portion. The depth of the wedge-shaped annular grooves gradually increases from bottom to top. The expansion sleeve includes an annular abutment and multiple support plates on its lower surface. The multiple support plates are arranged in a ring array on the lower surface of the annular abutment. Multiple contact plates are arranged on the inner ring surface of each support plate. The multiple contact plates are equally spaced vertically. The spacing between the contact plates is consistent with the spacing between the wedge-shaped annular grooves. The multiple contact plates in each support plate are engaged in the multiple wedge-shaped annular grooves to expand it.
2. A bolt assembly having a sleeve according to claim 1, wherein: A bolt assembly with an expansion sleeve according to claim 1, characterized in that a nylon patch is provided on the outer surface of each of the support plates.
3. A bolt assembly having a sleeve according to claim 1, wherein: According to claim 1, a bolt assembly with an expansion sleeve is characterized in that the angle between the support plate and the axis after the support plate is expanded is between 1° and 3°.
4. A bolt assembly having a sleeve according to claim 1, wherein: A flat washer is provided between the nut and the expansion sleeve.