A fastener to prevent static torque decay

Abstract

The application relates to a fastener capable of preventing static torque attenuation, comprising a clamp body, two end heads provided with locking support plates on the locking end of the clamp body, one of the locking support plates being hinged with a locking screw, the other end of the locking screw penetrating through the other locking support plate and being locked and fixed through a nut, one side of the nut being provided with a locking piece on the locking support plate, the end of the locking screw penetrating through the locking piece being matched with the nut for locking, the locking piece being hinged with a locking piece, the end surface of the nut being uniformly distributed with a plurality of locking grooves capable of cooperating with the locking piece to form a self-locking state, the locking piece being gradually locked through the pressure of the nut rotation, and the problem of static torque attenuation after the nut and the locking screw are locked can be avoided as much as possible.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fasteners, in particular to a fastener capable of preventing static torque decay. BACKGROUND

[0002] Static torque refers to the torque required to continue rotating a fastener in the tightening direction at the moment when the fastener is tightened. Static torque occurs after tightening, and during use, there will be a certain torque decay over time for any connection. Static torque decay is inevitable.

[0003] Currently, in some pipe connections, the fasteners do not need to be replaced for a long time, and the static torque decay of the fasteners is an inevitable problem in production and use for manufacturers. For example, a common fastener has two end heads on the locking end of the clamp body, each provided with a locking support plate. One of the locking support plates is hingedly connected to a locking screw, the other end of the locking screw passes through the other locking support plate and is locked and fixed by a nut. The clamp body can be a two-segment semicircular structure connected by a hinge at one end and locked at the other end, or a non-segmented structure with only one end provided with an opening and locked by a locking structure at the opening.

[0004] According to the related technology described above, the inventor believes that the combination of the nut and the locking screw cannot effectively prevent static torque decay during use. Moreover, during the installation of the locking screw and the nut, the locking screw is prone to deviation, which not only causes thread pulling during the tightening of the nut, but also results in poor locking effect of the locking screw and the nut. SUMMARY

[0005] In order to avoid the static torque decay problem of the nut and the locking screw after locking as much as possible, the present application provides a fastener capable of preventing static torque decay.

[0006] The fastener capable of preventing static torque decay provided by the present application adopts the following technical solution:

[0007] The fastener capable of preventing static torque decay comprises a clamp body, two end heads on the locking end of the clamp body are respectively provided with locking support plates, one of the locking support plates is hingedly connected to a locking screw, the other end of the locking screw passes through the other locking support plate and is locked and fixed by a nut, a locking member is arranged on one side of the nut, the end of the locking screw passing through the locking member is locked with the nut, a locking piece is hingedly connected to the locking member, a plurality of locking grooves capable of forming a self-locking state with the locking piece are uniformly distributed on the end surface of the nut facing the locking piece, and the locking piece gradually forms a reverse stopping action on the locking grooves through the pressure of the nut during tightening.

[0008] Optionally, the inner ring of the locking member is circumferentially provided with a plurality of mounting grooves, and the opposite sidewalls of the mounting grooves are provided with hinged grooves; the opposite sides of the locking member are respectively provided with hinged shafts, and the hinged shafts and the corresponding hinged grooves form a hinged relationship.

[0009] Optionally, the inner ring of the locking member is circumferentially provided with a plurality of mounting grooves, and the opposite sidewalls of the mounting grooves are provided with hinged grooves; the opposite sides of the locking member are respectively provided with hinged shafts, and the hinged shafts and the corresponding hinged grooves form a hinged relationship.

[0010] Optionally, the locking member comprises a mounting base for mounting the hinged shaft, a locking tooth, and a press-in portion; the mounting base is located in the mounting groove; the locking tooth is arranged at one end of the mounting base facing the locking groove; and the press-in portion is arranged at one end of the mounting base facing the press-in groove, and is located in the press-in groove.

[0011] Optionally, the bottom of the mounting groove is provided with an arc-shaped transition surface, and the mounting base is provided with an arc-shaped surface matching the transition surface; the cross section of the locking tooth is triangularly arranged, and the locking groove is adapted to the locking tooth.

[0012] Optionally, when the press-in portion is not subjected to pressure, the locking tooth is located in the mounting groove, and an included angle between the press-in portion and the bottom surface of the press-in groove is 5-10 degrees; an included angle between the side of the mounting base facing the center of the annular groove and the vertical surface of the bottom surface of the press-in groove is the same as the included angle between the press-in portion and the bottom surface of the press-in groove.

[0013] Optionally, the annular groove is provided with a pressure pad for applying pressure to the locking member to make it cooperate with the nut to be self-locked; the axial height of the pressure pad is not less than the axial height of the annular groove.

[0014] Optionally, the locking member comprises a mounting sleeve and a mounting pad; the mounting sleeve is sleeved on the locking screw; and the mounting pad is arranged at one end of the mounting sleeve facing the nut.

[0015] Optionally, the locking support plate on one side of the nut is provided with a U-shaped groove, the opposite sidewalls of the U-shaped groove are respectively provided with symmetrically-arranged guide grooves, and the mounting sleeve is provided with a guide strip matching the guide grooves at a position close to the mounting pad.

[0016] In summary, the present application has at least one of the following beneficial technical effects:

[0017] 1. By setting the locking piece, and the locking piece on the locking piece and the nut are matched with each other, the static torque decay problem of the nut after locking with the locking screw can be avoided as much as possible, so that the nut is tightened, and the locking piece is installed on the locking piece by hinged way, and the locking piece is locked by the locking piece. The locking behavior is generated by the compression force of the nut, and the nut needs to generate a reverse force to loosen, and the reverse force is locked by the locking piece, so that the mutual self-locking state is formed between the two, and loosening cannot be generated.

[0018] 2. By using the design of installation slot, pressing slot and the like, the installation of the locking piece can be facilitated, the space cooperation layout between parts is reasonably utilized, the overall installation neatness is high, the individual part exposure condition can be well reduced, and better cooperation between parts can be formed.

[0019] 3. By the structure design of the locking piece, the locking piece can be well hidden in the locking piece, and the self-locking relationship with the nut can be formed by cooperating with the pressing washer.

[0020] 4. By the design of the locking piece and the U-shaped groove, the locking screw is not easy to deviate during the mutual cooperation installation of the locking screw and the nut, the installation accuracy is higher, and the static torque decay in the later use due to installation out of position is further avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic diagram of a fastener for preventing static torque decay.

[0022] Figure 2 It is an explosion structure schematic diagram of a locking piece, a locking piece, and a pressing washer of a fastener for preventing static torque decay.

[0023] Figure 3 It is a structure schematic diagram of a locking piece of a fastener for preventing static torque decay.

[0024] Figure 4 It is Figure 3 A partial enlarged structure schematic diagram of part A.

[0025] Figure 5 It is a structure schematic diagram of a locking piece of a fastener for preventing static torque decay.

[0026] Figure 6 It is a structure schematic diagram of a nut of a fastener for preventing static torque decay.

[0027] Figure 7is a partial structural schematic view of a fastener clamping body for preventing static torque attenuation, used to show the locking support plate structure on one side of the nut.

[0028] Marked for explanation: 1, clamping body; 2, locking screw; 3, locking piece; 4, locking piece; 5, nut; 6, locking groove; 7, annular groove; 8, mounting groove; 9, press-in groove; 10, hinged groove; 11, hinged shaft; 12, mounting base; 13, locking tooth; 14, press-in part; 15, transition surface; 16, arc surface; 17, pressure pad; 18, U-shaped groove; 19, guide groove; 20, guide bar; 21, locking support plate; 22, mounting washer. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying Figures 1-7 Further detailed description of the present application.

[0030] At present, the common clamping body 1 is provided with a locking structure at the opening for locking, which is mostly in the form of locking screw 2 and nut 5 cooperation locking, and in the usual case, if the washer with locking tooth 13 and the nut 5 with locking groove 6 are cooperated, although it can solve the problem that the nut 5 and the washer cannot be reversed, but there is no self-locking between the washer and the locking support plate 21, which also causes the static torque attenuation after the fastener is used for a period of time.

[0031] The embodiment of the present application discloses a fastener for preventing static torque attenuation. Referring to Figure 1 、 2 , the clamping body 1 of which is provided with two locking support plates 21 at the two ends of the locking end, one of which is hinged with a locking screw 2, the other end of the locking screw 2 passes through the other locking support plate 21 and is locked and fixed by a nut 5, the locking support plate 21 on one side of the nut 5 is provided with a locking piece 3, and the end of the locking screw 2 passing through the locking piece 3 is cooperated with the nut 5 for locking; the locking piece 3 is hinged with a locking piece 4, and the end face of the nut 5 towards the locking piece 4 is uniformly distributed with a plurality of locking grooves 6 which can form a self-locking state with the locking piece 4, and the locking piece 4 gradually forms a reverse stopping action on the locking groove 6 by the pressure when the nut 5 is tightened.

[0032] In the embodiment, referring to Figure 3 、 4The inner ring of the locking piece 3 is provided with an annular groove 7, and the inner ring of the locking piece 3 is uniformly distributed with a plurality of mounting grooves 8 near the annular groove 7, and the annular groove 7 and each mounting groove 8 are provided with a press-in groove 9 at the corresponding position, and the press-in groove 9 is communicated with the mounting groove 8; wherein the opposite two side walls of the mounting groove 8 are provided with a hinged groove 10, and the hinged groove 10 is communicated with the end face of the locking piece 3, so that the installation of the locking piece 4 is facilitated, and the opposite two sides of the locking piece 4 are respectively provided with a hinged shaft 11, and the hinged shaft 11 cooperates with the corresponding hinged groove 10 to form a hinged relationship.

[0033] Referring to Figure 5 The locking piece 4 in the above includes a mounting base 12 for mounting the hinged shaft 11, a locking tooth 13 and a press-in portion 14, wherein the groove bottom of the mounting groove 8 is provided with an arc-shaped transition surface 15, and the mounting base 12 is provided with an arc-shaped surface 16 matched with the transition surface 15; generally, the hinged shaft 11 is arranged at the center position of the arc-shaped surface 16, or is arranged at the circular position close to the arc-shaped surface 16, so that the locking tooth 13 can be better hidden in the mounting groove 8 or exposed outside the mounting groove 8 during the rotation of the hinged shaft 11; in the embodiment, the mounting base 12 is located in the mounting groove 8 as a whole, the locking tooth 13 is arranged at one end of the mounting base 12 facing the locking groove 6, and the press-in portion 14 is arranged at one end of the mounting base 12 facing the press-in groove 9, and the press-in portion 14 is located in the press-in groove 9.

[0034] In order to ensure that the locking groove 6 and the locking tooth 13 are matched and can form a locking effect, the cross section of the locking tooth 13 is triangularly arranged, and the cross section of the locking groove 6 is also triangularly arranged.

[0035] When the press-in portion 14 is not subjected to pressure, part of the press-in portion 14 is exposed outside the press-in groove 9, or part of the press-in portion 14 is located in the annular groove 7, and the locking tooth 13 is located in the mounting groove 8; generally, in order to ensure that the locking tooth 13 and the locking tooth 13 are better matched, a small part of the locking tooth 13 can be exposed outside the mounting groove 8, and this part is generally the part of the locking tooth 13 close to the annular groove 7; in order to better understand, it is assumed that the included angle a between the press-in portion 14 and the bottom surface of the press-in groove 9 is 5-10 degrees when the press-in portion 14 is not subjected to force; the small angle design can make the exposed part not too much after the installation of the locking piece 4, and in the case of being subjected to pressure, the locking tooth 13 can be gradually exposed more quickly, and at the same time, the included angle β between the side surface of the mounting base 12 facing the center of the annular groove 7 and the vertical surface of the bottom surface of the press-in groove 9 is the same as the included angle a between the press-in portion 14 and the bottom surface of the press-in groove 9 when the press-in portion 14 is not subjected to force.

[0036] In this embodiment, the annular groove 7 is equipped with a pressure washer 17 for applying pressure to the locking member 4 to make it self-locking with the nut 5. The axial height of the pressure washer 17 is not less than the axial height of the annular groove 7. The height is set to better ensure that the nut 5 can better contact the pressure washer 17 and apply force to the pressure washer 17. However, the height of the pressure washer 17 should not be too high, and it is necessary to ensure good fit between the locking groove 6 and the locking tooth 13 of the nut 5. In addition, it should be noted that the locking member 4 has an overall L-shaped structure. With the design of the included angles α and β at the two points, when the pressure washer 17 is placed in the annular groove 7, the end face of the pressure washer 17 opposite to the pressing groove 9 can directly apply pressure to the pressing part 14. At the same time, the outer annular surface of the pressure washer 17 can abut against the side of the mounting base 12 facing the center of the annular groove 7, which can assist in applying pressure, so that the locking member 4 can respond more quickly. Moreover, the double-sided abutment method makes the clamping effect better.

[0037] Reference Figure 6 , 7 To ensure that the locking screw 2 does not easily shift during the installation of the locking screw 2 and nut 5, thus improving installation accuracy, the locking component 3 includes an installation sleeve and an installation washer 22 fitted onto the locking screw 2. The installation washer 22 is located at the end of the installation sleeve facing the nut 5. The aforementioned installation groove 8, annular groove 7, press-in groove 9, and locking component 4 are all located on the end face of the installation washer 22 facing the nut 5. The locking support plate 21 on one side of the nut 5 is provided with a U-shaped groove 18. The U-shaped groove 18 has symmetrically positioned guide grooves 19 on its two opposite side walls. A guide strip 20 matching the guide groove 19 is provided near the installation washer 22 on the installation sleeve.

[0038] The implementation principle of a fastener for preventing static torque decay in this application embodiment is as follows: First, rotate the locking screw 2 to the locking support plate 21 on the side of the nut 5. Then, put the mounting sleeve onto the locking screw 2. While putting it on, pay attention to the cooperation between the guide strip 20 on the mounting sleeve and the guide groove 19. In addition, the locking member 4 needs to be installed into the corresponding mounting groove 8. Then, put the pressure washer 17 into the annular groove 7 and screw in the nut 5. During the tightening process, the nut 5 continuously moves towards the pressure washer 17 until it contacts the pressure washer 17. At this time, the pressure on the pressure washer 17 is not very large. Although the locking member 4 can contact the locking groove 6, the pressure is not very high due to the pressure of the pressure washer 17. The pressure washer 17 does not apply enough force, so the nut 5 is still screwed in well. As the nut 5 is screwed in, the pressure washer 17 applies more force to the locking member 4, and the locking member 4 applies more force to the nut 5 until the nut 5 is fully tightened. During the tightening process, after the nut 5 is tightened, the locking member 4 is installed on the locking member 3 by a hinge. The anti-reverse behavior of the locking member 4 is generated by the clamping force of the nut 5. If the nut 5 is to loosen, a reverse force is required, and the locking member 4 prevents the reverse force. In this way, the two form a self-locking state and cannot loosen.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fastener for preventing static torque decay, comprising a clamp body (1), wherein locking support plates (21) are respectively provided on two ends of the locking end of the clamp body (1), wherein a locking screw (2) is hinged to one locking support plate (21), and the other end of the locking screw (2) passes through the other locking support plate (21) and is locked and fixed by a nut (5), characterized in that: A locking element (3) is provided on the locking support plate (21) on one side of the nut (5). The locking screw (2) passes through the end of the locking element (3) and locks with the nut (5). A locking element (4) is hinged on the locking element (3). The end face of the nut (5) facing the locking element (4) has multiple locking grooves (6) evenly distributed around the circumference, which can cooperate with the locking element (4) to form a self-locking state. The locking element (4) gradually forms a non-reverse action on the locking grooves (6) by the pressure when the nut (5) is tightened. The inner part of the locking element (3) An annular groove (7) is provided at the ring. The locking member (4) includes locking teeth (13) and a pressing part (14). The annular groove (7) is equipped with a pressure washer (17) for applying pressure to the locking member (4) so ​​that it can lock itself with the nut (5). During the tightening process, the nut (5) continuously moves towards the pressure washer (17) until it contacts the pressure washer (17). The pressure washer (17) directly applies pressure to the pressing part (14). The locking groove (6) and the locking teeth (13) cooperate with each other.

2. The fastener for preventing static torque decay according to claim 1, characterized in that: The inner ring of the locking member (3) has multiple mounting grooves (8) evenly distributed around the circumference. The mounting grooves (8) are provided with hinge grooves (10) on the opposite side walls. The locking member (4) is provided with hinge shafts (11) on opposite sides respectively. The hinge shafts (11) cooperate with the corresponding hinge grooves (10) to form a hinge relationship.

3. A fastener for preventing static torque decay according to claim 2, characterized in that: Each of the annular grooves (7) and each mounting groove (8) is provided with a pressing groove (9) at the corresponding position, and the pressing groove (9) is connected to the mounting groove (8).

4. A fastener for preventing static torque decay according to claim 3, characterized in that: The locking member (4) also includes a mounting base (12) for mounting the hinge shaft (11). The mounting base (12) is located in the mounting groove (8). The locking tooth (13) is located at one end of the mounting base (12) facing the locking groove (6). The pressing part (14) is located at one end of the mounting base (12) facing the pressing groove (9), and the pressing part (14) is located in the pressing groove (9).

5. A fastener for preventing static torque decay according to claim 4, characterized in that: The bottom of the mounting groove (8) is provided with an arc-shaped transition surface (15), and the mounting base (12) is provided with an arc-shaped surface (16) that matches the transition surface (15); the locking tooth (13) has a triangular cross section, and the locking groove (6) is adapted to the locking tooth (13).

6. A fastener for preventing static torque decay according to claim 4, characterized in that: When no pressure is applied to the pressing part (14), the locking tooth (13) is located in the mounting groove (8), and the pressing part (14) forms an angle of 5-10 degrees with the bottom surface of the pressing groove (9). The angle formed between the side of the mounting base (12) facing the center of the annular groove (7) and the vertical plane of the bottom surface of the pressing groove (9) is the same as the angle formed between the pressing part (14) and the bottom surface of the pressing groove (9).

7. A fastener for preventing static torque decay according to claim 3, characterized in that: The axial height of the pressure washer (17) is not less than the axial height of the annular groove (7).

8. A fastener for preventing static torque decay according to any one of claims 1 to 7, characterized in that: The locking component (3) includes a mounting sleeve and a mounting washer (22) sleeved on the locking screw (2), with the mounting washer (22) located at the end of the mounting sleeve facing the nut (5).

9. A fastener for preventing static torque decay according to claim 8, characterized in that: The locking support plate (21) on one side of the nut (5) is provided with a U-shaped groove (18). The U-shaped groove (18) is provided with guide grooves (19) on opposite sides. The mounting sleeve is provided with a guide strip (20) that matches the guide groove (19) near the mounting washer (22).

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