A new type of anti-loose countersunk head bolt structure and a method for using the same

Abstract

The application discloses a novel anti-loose countersunk head bolt structure and a use method thereof. The head of the countersunk head bolt is flush with the end face of a connecting piece A, the long axis direction countersunk face beta of the oval head cooperates with the long axis direction countersunk face beta of a top opening groove of a through hole of the connecting piece A, the spring washer between the connecting piece A and a connecting piece B provides elastic force, the long axis direction countersunk face beta of the oval head is adhered to the long axis direction countersunk face beta of the top opening groove of the through hole of the connecting piece A, when the bolt has a rotating tendency in the loosening direction, reverse wedge pressure is generated, the long axis direction countersunk face beta of the oval head rotates to the short axis direction face alpha of the top opening groove of the through hole of the connecting piece A, so that the anti-loose effect is realized, and the problem that the countersunk head bolt cannot be flush with the end face of the connecting piece after installation in the prior art is solved.

Description

Technical Field

[0001] This invention relates to a novel anti-loosening countersunk bolt structure and its application method, belonging to the field of fastener technology. Background Technology

[0002] Countersunk bolts, once installed, remain flush with the end face of the connected parts and are widely used in mechanical connections. However, countersunk bolts are prone to loosening under dynamic loads, leading to connection failure or detachment.

[0003] Existing anti-loosening countersunk bolt technology, as seen in Chinese Patent Publication No. CN211778425U, achieves anti-loosening by having the protruding plane of the anti-loosening clip contact the right-angle anti-loosening plane of the countersunk bolt. However, after the anti-loosening clip is installed in the mounting groove of the connector, it will protrude from the end face of the connector, preventing the countersunk bolt from remaining flush with the end face of the connector after installation. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a novel anti-loosening countersunk bolt structure and its usage method.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a novel anti-loosening countersunk bolt structure, comprising: A countersunk bolt that prevents loosening when connecting connector A and connector B with spring washers installed.

[0007] The countersunk bolt comprises a head, a smooth shank, and a threaded section that are integrally formed and fixed in sequence; the head is elliptical, the smooth shank has no threads, and the threaded section has external threads.

[0008] The head has a recessed wrench groove, which can be any one of a plum blossom groove, a hexagonal groove, or a cross groove.

[0009] The angle of the countersunk surface along the long axis of the elliptical head is β, and the angle of the countersunk surface along the short axis of the elliptical head is α. β is greater than α, so that the countersunk surface along the long axis of the head is convex relative to the countersunk surface along the short axis of the head. The transition surface between the countersunk surface along the long axis of the head and the countersunk surface along the short axis of the head is an arc surface.

[0010] It also includes connector A, spring washer, and connector B.

[0011] The connector A has a through hole, and an elliptical groove is recessed at the top of the through hole. The elliptical shape of the groove corresponds to the elliptical shape of the head, so that the minor axis of the groove at the top of the through hole of the connector A is higher than the major axis.

[0012] The connector B is provided with a threaded hole that can engage with the external thread of the threaded section, and the angle difference between β and α is greater than the thread helix angle of the external thread of the threaded section.

[0013] A method for using a novel anti-loosening countersunk bolt structure includes the following steps: A spring washer is placed between connector A and connector B. The threaded section of the countersunk bolt passes through the through hole of connector A and the spring washer, and then screws into the threaded hole of connector B. At this time, the smooth section is in the through hole of connector A. When the head of the countersunk bolt contacts the elliptical groove at the top of the through hole of connector A, as it continues to screw down, the countersunk surface β of the elliptical head rotates to the minor axis surface α of the groove at the top of the through hole of connector A, generating a preload downward thrust that presses down on the spring washer. The spring washer is compressed, providing displacement, allowing the countersunk bolt to continue to screw in. This process is repeated until the head of the countersunk bolt is flush with the end face of connector A, and the countersunk surface β of the elliptical head rotates to the minor axis surface α of the groove. The countersunk head bolt engages with the countersunk surface β of the top groove of the through hole in connector A. A spring washer between connector A and connector B provides elastic force, ensuring that the countersunk surface β of the elliptical head in the long axis direction is in contact with the countersunk surface β of the top groove of the through hole in connector A. When connector A and connector B are subjected to dynamic loads, the countersunk bolt tends to loosen. However, since the angle difference between β and α is greater than the thread helix angle of the external thread of the thread segment, when the countersunk surface β of the elliptical head in the long axis direction passes through the minor axis surface α of the top groove of the through hole in connector A, a reverse wedge pressure is generated, which prevents the countersunk bolt from rotating, thereby achieving an anti-loosening connection between connector A and connector B by the countersunk bolt.

[0014] The beneficial effects of this invention are as follows: the head of the countersunk bolt is flush with the end face of connector A, the countersunk surface β of the elliptical head along the major axis mates with the countersunk surface β of the top groove of the through hole of connector A, and the spring washer between connector A and connector B provides elastic force to ensure that the countersunk surface β of the elliptical head along the major axis mates with the countersunk surface β of the top groove of the through hole of connector A. Since the angle difference between β and α is greater than the thread helix angle of the external thread of the thread segment, a reverse wedge pressure is generated to achieve the anti-loosening effect. This solves the problem that the countersunk bolt cannot be flush with the end face of the connector after installation when implementing anti-loosening connection in the prior art. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the countersunk bolt of the present invention; Figure 2 yes Figure 1 A top-down view; Figure 3 yes Figure 1 A left-view diagram; Figure 4 This is a schematic cross-sectional view of the installation of the countersunk bolt, connector A, spring washer, and connector B of the present invention. In the diagram: 1-Head; 2-Smooth rod section; 3-Threaded section; 4-Tightening groove; 6-Counterhead bolt; 7-Connector A; 8-Spring washer; 9-Connector B. Detailed Implementation

[0016] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0017] like Figures 1 to 4 As shown.

[0018] This application discloses a novel anti-loosening countersunk bolt structure, comprising: The countersunk bolt 6 consists of an elliptical head 1, a smooth, unthreaded shaft 2, and a threaded shaft 3 with external threads, all integrally formed and arranged from top to bottom. The head 1 has a recessed tightening groove 4, which can be a star groove, hexagonal groove, or cross groove, etc., for tightening during assembly.

[0019] The angle of the countersunk surface along the major axis of the elliptical head 1 is β, and the angle of the countersunk surface along the minor axis of the elliptical head 1 is α. β is greater than α, so that the countersunk surface along the major axis of the head 1 is convex downward relative to the countersunk surface along the minor axis of the head 1. However, since the head 1 is elliptical, the transition surface between the countersunk surface along the major axis of the head 1 and the countersunk surface along the minor axis of the head 1 is an arc surface, which does not present a step-like height change, thus facilitating subsequent rotation.

[0020] It also includes connector A7, spring washer 8, and connector B9; connector A7 has a through hole, and the top opening of the through hole has an elliptical groove, the ellipse of which corresponds to the ellipse of the head 1, so that the minor axis of the groove at the top opening of the through hole of connector A7 is higher than the major axis; connector B9 has a threaded hole, and the internal thread of the threaded hole of connector B9 can be screwed and fixed with the external thread of threaded segment 3, and the angle difference between β and α is greater than the thread helix angle of the external thread of threaded segment 3.

[0021] The present application discloses a method for using a novel anti-loosening countersunk bolt structure, comprising the following steps: Spring washer 8 is placed between connector A7 and connector B9. The threaded section 3 of countersunk bolt 6 passes through the through hole of connector A7 and spring washer 8, and then screws into the threaded hole of connector B9. At this time, the smooth section 2 is in the through hole of connector A7. When the head 1 of countersunk bolt 6 contacts the elliptical groove at the top opening of the through hole of connector A7, as it continues to screw down, the countersunk surface β of the elliptical head 1 rotates to the minor axis surface α of the groove at the top opening of the through hole of connector A7, generating a pre-tightening downward thrust that presses down on spring washer 8. Spring washer 8 is compressed, providing displacement, allowing countersunk bolt 6 to continue to screw in. This process is repeated until the head 1 of countersunk bolt 6 is flush with the end face of connector A7, so that the countersunk surface β of the elliptical head 1 is aligned with the major axis surface α of the groove at the top opening of the through hole of connector A7. The countersunk face β fits, and the spring washer 8 between connector A7 and connector B9 provides elastic force to ensure that the countersunk face β of the elliptical head 1 in the long axis direction fits with the countersunk face β of the top groove of the through hole of connector A7 in the long axis direction. When connector A7 and connector B9 are subjected to dynamic load, the countersunk bolt 6 has a tendency to loosen. However, since the angle difference between β and α is greater than the thread helix angle of the external thread of thread segment 3, when the countersunk face β of the elliptical head 1 in the long axis direction passes through the short axis face α of the top groove of the through hole of connector A7, a reverse wedge pressure will be generated to prevent the countersunk bolt 6 from rotating. This achieves the anti-loosening connection of the countersunk bolt 6 to connector A7 and connector B9, and solves the problem that the countersunk bolt cannot be flush with the end face of the connector after installation when the anti-loosening connection is achieved in the prior art.

Claims

1. A novel anti-loosening countersunk bolt structure, characterized in that, include: A countersunk bolt (6) that can prevent loosening after connecting connector A (7) with spring washer (8) and connector B (9) is connected.

2. The novel anti-loosening countersunk bolt structure and its usage method as described in claim 1, characterized in that: The countersunk bolt (6) includes a head (1), a smooth rod section (2), and a threaded section (3) that are integrally formed and fixed in sequence; the head (1) is elliptical, the smooth rod section (2) has no thread, and the threaded section (3) has external thread.

3. The novel anti-loosening countersunk bolt structure as described in claim 2, characterized in that: The head (1) has a recessed wrench groove (4).

4. The novel anti-loosening countersunk bolt structure as described in claim 3, characterized in that: The wrench groove (4) can be any one of a plum blossom groove, a hexagonal groove, or a cross groove.

5. The novel anti-loosening countersunk bolt structure as described in claim 2, characterized in that: The angle of the countersunk surface in the major axis direction of the elliptical head (1) is β, and the angle of the countersunk surface in the minor axis direction of the elliptical head (1) is α. β is greater than α, so that the countersunk surface in the major axis direction of the head (1) is convex relative to the countersunk surface in the minor axis direction of the head (1). The transition surface between the countersunk surface in the major axis direction of the head (1) and the countersunk surface in the minor axis direction of the head (1) is an arc surface.

6. The novel anti-loosening countersunk bolt structure as described in claim 2, characterized in that: It also includes connector A (7), spring washer (8), connector B (9).

7. The novel anti-loosening countersunk bolt structure as described in claim 6, characterized in that: The connector A (7) is provided with a through hole, and the top opening of the through hole is recessed with an elliptical groove. The elliptical shape of the groove corresponds to the elliptical shape of the head (1), so that the minor axis of the groove at the top opening of the through hole of the connector A (7) is higher than the major axis.

8. The novel anti-loosening countersunk bolt structure as described in claim 6, characterized in that: The connector B (9) is provided with a threaded hole that can engage with the external thread of the threaded section (3), and the angle difference between β and α is greater than the thread helix angle of the external thread of the threaded section (3).

9. A method of using the novel anti-loosening countersunk bolt structure as described in any one of claims 1 to 8, characterized in that, The process includes the following: The spring washer (8) is placed between connector A (7) and connector B (9). The threaded section (3) of the countersunk bolt (6) passes through the through hole of connector A (7) and the spring washer (8) and is screwed into the threaded hole of connector B (9). At this time, the smooth section (2) is in the through hole of connector A (7). When the head (1) of the countersunk bolt (6) contacts the elliptical groove at the top opening of the through hole of connector A (7), when it continues to screw down, the countersunk surface β of the elliptical head (1) in the long axis direction rotates to the short axis direction surface α of the groove at the top opening of the through hole of connector A (7), generating a preloaded downward thrust to press down the spring. Washers (8) and spring washers (8) are compressed to provide displacement, allowing the countersunk bolts (6) to continue to be screwed in, and so on, until the head (1) of the countersunk bolts (6) is flush with the end face of the connector A (7), so that the countersunk surface β of the long axis of the elliptical head (1) matches the countersunk surface β of the long axis of the top groove of the through hole of the connector A (7), and the spring washers (8) between the connector A (7) and the connector B (9) provide elastic force to ensure that the countersunk surface β of the long axis of the elliptical head (1) fits with the countersunk surface β of the long axis of the top groove of the through hole of the connector A (7); When connector A (7) and connector B (9) are subjected to dynamic load, countersunk bolt (6) tends to loosen. However, since the angle difference between β and α is greater than the thread helix angle of the external thread of the thread segment (3), when the countersunk surface β of the long axis direction of the elliptical head (1) passes through the short axis direction surface α of the top groove of the through hole of connector A (7), a reverse wedge pressure will be generated, which will prevent the countersunk bolt (6) from rotating, thereby realizing the anti-loosening connection of countersunk bolt (6) to connector A (7) and connector B (9).

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