Chery Automobile Filed A Patent For A Reusable Expansion Bolt Structure

On March 16, 2024, according to the announcement of the State Intellectual Property Office, Chery Automobile Co., Ltd. applied for a project entitled "a reusable expansion bolt structure", public number CN117703899A, the application date is December 2023. According to the patent abstract, the invention provides a reusable expansion bolt structure, including a bolt, and an expansion sleeve arranged outside the bolt and removable connected with the bolt. The expansion sleeve comprises a first expansion sleeve, a second expansion sleeve, a third expansion sleeve and a fourth expansion sleeve arranged from top to bottom. The bottom of the first expansion casing is coupled to the top of the second expansion casing, the bottom of the second expansion casing is coupled to the top of the third expansion casing, and the bottom of the third expansion casing is coupled to the top of the fourth expansion casing. During the operation, the bolt and the expansion sleeve are pre-tightened, and then the expansion bolt is placed into the through hole. In the process of tightening the bolt again, the lower end of the second expansion sleeve and the upper end of the third expansion sleeve expand outward at the same time under the action of force, and the expansion contacts the hole wall, so that the bolt and the expansion sleeve can be tightened to different apersizes of various parts.