CN-224214532-U - Bolt anti-loosening structure under action of large torque

CN224214532UCN 224214532 UCN224214532 UCN 224214532UCN-224214532-U

Abstract

The utility model provides a bolt locking structure for under big moment of torsion effect, includes connector, outer loop, inner loop, connecting block and fastening bolt, the inside processing of connector has the connecting hole, the internal diameter of each part of connecting hole and the external diameter phase-match of connecting block main part, the inside screw thread section that is provided with fastening bolt complex of connecting hole, outer loop and inner loop are wedge annular closed ring structure, and the external diameter of inner loop and the internal diameter of outer loop form concentric circle structure, the outer loop internal surface is the conical surface, the inner loop surface is the conical surface, and outer loop internal surface and inner loop external surface phase-match, and when both joined in marriage, the axial cross-section of formation is the rectangle. The utility model mainly comprises a tapered wedge-shaped outer ring and an inner ring, has simple structure and low manufacturing and processing cost, and can achieve the anti-loosening effect through coordinated deformation under the action of strong vibration.

Inventors

WANG XINFEI
CUI JIANNAN
ZHANG XIAOYONG
ZHANG QIYUE

Assignees

河南柴油机重工有限责任公司

Dates

Publication Date: 20260508
Application Date: 20250603

Claims (4)

1. The bolt anti-loosening structure for the large torque is characterized by comprising a connecting body (1), an outer ring (2), an inner ring (3), a connecting block (4) and a fastening bolt (5), wherein connecting holes (6) are formed in the connecting body (1), the inner diameters of all parts of the connecting holes (6) are matched with the outer diameter of the main body part of the connecting block (4), and threaded holes (7) matched with the fastening bolt (5) are formed in the connecting holes (6); The outer ring (2) and the inner ring (3) are of flat annular closed ring structures, the outer diameter of the inner ring (3) and the inner diameter of the outer ring (2) form a concentric circle structure, the inner surface of the outer ring (2) is a conical surface, the outer surface of the inner ring (3) is a conical surface, the inner surface of the outer ring (2) and the outer surface of the inner ring (3) are matched, and when the inner ring and the outer ring are matched, the formed axial section is rectangular.
2. The bolt anti-loosening structure for large torque is characterized in that the connecting block (4) is of a multi-stage table-board cylindrical structure and comprises a small table-board (4-1), a middle table-board (4-2) and a large table-board (4-3), the connecting block (4) can be sleeved with an inner ring (3) and an outer ring (2) and then mounted on the connecting body (1), the outer surface of the small table-board (4-1) is tightly contacted with the inner ring (3) and the outer ring (2), the connecting hole (6) comprises a limit hole Duan Yi (6-1) and a limit hole Duan Er (6-2), the diameter of the limit Kong Duanyi (6-1) is equal to that of the small table-board (4-1), and the diameter of the limit Kong Duaner (6-2) is equal to that of the middle table-board (4-2).
3. The bolt looseness-preventing structure for large torque is characterized in that the diameter of the large table top (4-3) is larger than that of a limit hole Duan Er (6-2) of the connecting block (4).
4. A bolt looseness-preventing structure under high torque according to claim 2, wherein the inner ring (3) and the outer ring (2) are made of high-strength alloy steel.

Description

Bolt anti-loosening structure under action of large torque Technical Field The utility model belongs to the technical field of machinery, and particularly relates to a bolt anti-loosening structure under the action of large torque. Background The bolt connection is used as the most widely used fastening mode in mechanical engineering, and the anti-loosening performance of the bolt connection is directly related to the safety and reliability of equipment operation. Under complex working conditions such as dynamic load, vibration impact and temperature alternation, the screw thread pair is easy to loose due to factors such as microscopic sliding, pretightening force attenuation or material creep of a contact surface, and further the problems such as connection failure are caused. The following are main measures for preventing loosening. The first is to counteract the lateral sliding force by lifting frictional resistance between the thread pairs or contact surfaces. The typical scheme comprises that the spring washer utilizes elastic resilience to compensate the pretightening force loss, but stress looseness is easy to occur at high temperature, so that pretightening force is greatly reduced, and the double-nut structure generates additional stress through axial opposite jacking, occupies larger axial space, increases weight and is not suitable for thin-wall connection. And the second type adopts a mechanical interlocking structure of directly blocking the relative movement of the thread pair by physical limit. The cotter pin and the groove type nut are combined to realize the constraint of the rotation freedom degree through the rigid bolt, and the stop washer forms spatial interference by utilizing the bending clamping position, but the anti-loose structure needs additional installation steps, and the assembly process is complex. Thirdly, the novel thread design for restraining loosening trend from the geometric structure source forms mechanical self-locking by combining the down threads with the left-handed threads and the right-handed threads, and the auxiliary operation of a spring washer and the like is not needed, but the manufacturing cost is high, and the anti-loosening effect is limited under the environments of high temperature and the like. Disclosure of Invention The utility model aims to provide a bolt anti-loosening structure used under the action of large torque, which mainly comprises an outer ring and an inner ring with taper. In order to achieve the aim, the technical scheme of the utility model is that the bolt anti-loosening structure for high torque comprises a connecting body, an outer ring, an inner ring, a connecting block and a fastening bolt, wherein connecting holes are processed in the connecting body, the inner diameter of each part of the connecting holes is matched with the outer diameter of a main body part of the connecting block, and threaded holes matched with the fastening bolt are formed in the connecting holes; The outer ring and the inner ring are of flat annular closed ring structures, the outer diameter of the inner ring and the inner diameter of the outer ring form a concentric circle structure, the inner surface of the outer ring is a conical surface, the outer surface of the inner ring is a conical surface, the inner surface of the outer ring is matched with the outer surface of the inner ring, and when the inner ring and the outer ring are matched, the formed axial section is rectangular. Further, the connecting block is a multistage mesa cylinder structure, and comprises a small mesa, a middle mesa and a large mesa, the connecting block can be sleeved with an inner ring and an outer ring and then is installed on the connecting body, the outer surface of the small mesa is in close contact with the inner ring and the outer ring, the connecting hole comprises a limit hole Duan Yi and a limit hole Duan Er, the diameter of the limit Kong Duanyi is equal to that of the small mesa, and the diameter of the limit Kong Duaner is equal to that of the middle mesa. Further, the diameter of the large table top is larger than the diameter of the limit hole Duan Er of the connecting block. Further, the inner and outer rings are made of high strength alloy steel. Compared with the prior art, the utility model has the beneficial effects that: 1. The anti-loose part mainly comprises an outer ring and an inner ring with taper, and is of an annular symmetrical structure, so that pressure distribution is more uniform, local stress concentration is avoided, and overall stability is improved. The structure is simple, and the manufacturing and processing costs are low. 2. When the fastening bolt is screwed up by a specific large torque, axial pulling force acts on the taper combination ring, and the pulling force is decomposed into radial component force and axial compression force due to the conical surface contact of the inner ring and the outer ring. And the design of the cone angle m