fastener

Abstract

A fastener is provided, comprising: a tightening member, which is configured to be combined with a mating screw to tighten a fastened member, and a first bonding surface is formed on the first end surface of the nut; and an annular member, which is coaxially arranged with the tightening member, and a first recess is formed on the first side of the annular member, and a second bonding surface is formed at the bottom of the first recess; wherein the first bonding surface is accommodated in the first recess, and the first bonding surface is combined with the second bonding surface, so that when the tightening member is loosened, the tightening member is hindered from further loosening. The fastener of the present invention can achieve more stable positioning of the nut or bolt head, and hide the bonding surface between the nut or bolt head and the annular member inside the annular member, reducing the possibility of foreign matter entering between the bonding surfaces under harsh working conditions and affecting the performance of the fastener, making the fastener more stable and reliable.

Description

Technical Field

[0001] The invention relates to a fastener, and in particular to a fastener capable of realizing more stable and reliable positioning and protection of a tightening member. Background Art

[0002] Fasteners are used in all walks of life that require connection and fastening, such as vehicles, construction machinery, agricultural machinery, manufacturing machinery, etc. For large-scale engineering machinery or engineering vehicles, due to the harsh working environment and heavy loads, the fasteners on them are subjected to vibrations and load impacts in all directions, which makes the tightening parts on the fasteners, such as nuts or bolt heads, more likely to loosen, resulting in reduced fastener function or even failure, causing great safety hazards.

[0003] At present, the commonly used anti-loosening methods for fasteners generally include non-removable anti-loosening solutions and anti-loosening solutions with increased friction. The non-removable anti-loosening solution uses welding, bonding or punching riveting to change the removable threaded connection into a non-removable threaded connection. In the non-removable anti-loosening solution, the threaded fasteners cannot be reused and are cumbersome to operate. They are often used in certain important occasions that require high anti-loosening performance without disassembly. The anti-loosening solution with increased friction uses the method of increasing the friction between the threads or the bolt (screw) head and the nut end face or increasing the friction of both at the same time to achieve the purpose of anti-loosening. The anti-loosening solution with increased friction is not limited by space and can be disassembled repeatedly, but the reliability is poor. After working for a certain period of time, the anti-loosening effect will be reduced due to vibration and other reasons. Summary of the invention

[0004] The technical problem solved by the present invention is to provide a fastener that can achieve more stable positioning of the nut or bolt head, and hide the mating surface between the nut or bolt head and the ring part inside the ring part, thereby reducing the possibility of foreign matter entering between the mating surfaces under harsh working conditions and affecting the performance of the fastener, making the fastener more stable and reliable.

[0005] According to an exemplary embodiment of the present invention, there is provided a fastener, comprising:

[0006] a tightening member configured to be combined with a mating screw to tighten a fastened member, a first engaging surface being formed on a first end surface of the nut; and

[0007] An annular member, the annular member is coaxially arranged with the tightening member, a first side of the annular member is formed with a first recessed portion, and a bottom of the first recessed portion forms a second bonding surface;

[0008] The first combining surface is accommodated in the first recessed portion, and the first combining surface is engaged with the second combining surface, so that when the tightening member is loosened, further loosening of the tightening member is hindered.

[0009] According to an exemplary embodiment of the present invention, the tightening member comprises:

[0010] the main body; and

[0011] A first protrusion extends from one end of the main body, and the first coupling surface is formed on an end surface of the first protrusion.

[0012] According to an exemplary embodiment of the present invention, the first engaging surface is provided with at least one first engaging portion, the second engaging surface is provided with at least one second engaging portion matching with the first engaging portion, the first engaging portion includes a first oblique engaging surface and a second blocking surface extending in a circumferential direction, the second engaging portion includes a first oblique engaging surface and a second blocking surface extending in a circumferential direction, wherein the first oblique engaging surface of the first engaging portion is configured to match and contact with the first oblique engaging surface of the second engaging portion, and the second blocking surface of the first engaging surface is configured to match and contact with the second blocking surface of the second engaging portion, so as to realize the engagement of the tightening member with the annular member.

[0013] According to an exemplary embodiment of the present invention, the first oblique joining surface of the first joining portion and the first oblique joining surface of the second joining portion both form helical surfaces with the same lead angle to cooperate with each other, the helical lead angle of the helical surface is greater than the thread lead angle of the external thread of the mating screw, and the spiral rise direction of the helical surface on the second joining portion of the annular member is opposite to the tightening direction of the external thread.

[0014] According to an exemplary embodiment of the present invention, there are two first engaging portions and two matching second engaging portions.

[0015] According to an exemplary embodiment of the present invention, the second blocking surface of the first joint portion and the second blocking surface of the second joint portion have the same angle with the horizontal plane, and both are obtuse angles or right angles.

[0016] According to an exemplary embodiment of the present invention, a ratchet is formed on a second side of the annular member opposite to the first side, and the ratchet is configured so that the friction between the annular member and the fastened element is greater than the friction between the nut and the annular member, so that the annular member remains stationary relative to the fastened element when the tightening member is loosened relative to the screw rod.

[0017] According to an exemplary embodiment of the present invention, the ratchet teeth are configured to be arranged radially on a surface of the ring member at a side close to the fastened element.

[0018] According to an exemplary embodiment of the present invention, the tightening member has a regular quadrangular prism, a regular hexagonal prism or a plum blossom-shaped outer surface, and a plum blossom edge is formed on the outer peripheral surface of the annular member so that the wrench device drives the tightening member and the annular member to rotate together.

[0019] According to an exemplary embodiment of the present invention, the number of sides of the plum blossom side of the annular member is more than three times the number of sides of the prismatic tightening member.

[0020] According to an exemplary embodiment of the present invention, the wrench device comprises:

[0021] A cylindrical main body;

[0022] A first wrench portion, disposed inside the main body portion and configured to cooperate with the plum blossom edge of the annular member; and

[0023] The second wrench portion is arranged on the inner side of the main body portion and is configured to match with the outer side surface of the tightening member.

[0024] According to an exemplary embodiment of the present invention, an arc-shaped guide groove communicating with the driving hole is further formed on the annular member.

[0025] According to an exemplary embodiment of the present invention, the tightening member is a nut, and the nut is threadably matched with the mating screw.

[0026] According to an exemplary embodiment of the present invention, the nut and the ring are configured such that they cannot be completely separated.

[0027] According to an exemplary embodiment of the present invention, the tightening member further includes an annular second protrusion, the second protrusion extending from the first protrusion at an inner side of the first coupling surface to be accommodated in the annular member.

[0028] According to an exemplary embodiment of the present invention, the end of the second protrusion forms a flange protruding outward, and the flange cooperates with the second side of the ring member to allow the nut to rotate relative to the ring member but cannot be separated from the ring member.

[0029] According to an exemplary embodiment of the present invention, the flange is formed by a stamping process after the second protrusion passes through the ring member from the first side of the ring member to the second side.

[0030] According to an exemplary embodiment of the present invention, the nut and the ring member are separate parts.

[0031] According to an exemplary embodiment of the present invention, the tightening member is a bolt head, and the bolt head is integrally connected with the mating screw and rotates together.

[0032] According to the fastener described in the various embodiments of the present invention, the first bonding surface is accommodated in the first recessed portion, and the bonding surface between the nut or bolt head and the ring member is hidden inside the ring member, thereby reducing the possibility of foreign matter entering between the first bonding surface and the second bonding surface under harsh working conditions and affecting the performance of the fastener, making the fastener more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described in detail with reference to the accompanying drawings, in which:

[0034] Figure 1 is a perspective schematic diagram showing a fastener according to an exemplary embodiment of the present invention;

[0035] Figure 2 It is shown Figure 1 An exploded schematic diagram of the fastener shown;

[0036] Figure 3 It is shown Figure 1 A partial cross-sectional schematic diagram of the fastener shown;

[0037] Figure 4 It is shown Figure 1 a top view of the fastener shown;

[0038] Figure 5 It is shown Figure 1 A perspective schematic diagram of a nut of the fastener shown;

[0039] Figure 6 It is shown Figure 5 A partial cross-sectional view of the nut shown;

[0040] Figure 7 is a partial cross-sectional view showing a nut according to another exemplary embodiment of the present invention;

[0041] Figure 8 It is shown Figure 1 A three-dimensional schematic diagram of a ring member of the fastener shown;

[0042] Fig. 9 It is shown Figure 1 Another perspective schematic diagram of the ring member of the fastener shown;

[0043] Fig.10 It is shown Fig. 9 A partial cross-sectional view of the ring member shown;

[0044] Fig.11is a diagram showing an exemplary embodiment according to the present invention Fig. 9 A top view of the ring member shown;

[0045] Fig.12 is a top view showing a ring member according to another exemplary embodiment of the present invention;

[0046] Fig.13 It is shown Figure 5 A geometric principle diagram of the helix angle of the first engaging surface of the tightening member shown;

[0047] Fig.14 is a geometric principle diagram showing the helix angle of the external thread of the screw rod that cooperates with the tightening member of the embodiment of the present invention;

[0048] Fig.15 is a perspective schematic diagram showing a wrench device for tightening or loosening the fastener;

[0049] Fig.16 It is shown Fig.15 A cross-sectional view of the wrench assembly shown;

[0050] Fig.17 is a cross-sectional view of a wrench device according to another exemplary embodiment of the present invention;

[0051] Fig.18 It shows that Figure 1 A schematic diagram of the working principle of the fastener shown when applied to an engineering vehicle;

[0052] Fig.19 is an exploded schematic diagram showing a fastener according to another exemplary embodiment of the present invention; and

[0053] Fig. 20 It shows the use of Fig.19 The schematic diagram of the working principle of the fastener when fastening the fastened object is shown. DETAILED DESCRIPTION

[0054] Although the present invention will be fully described with reference to the accompanying drawings containing preferred embodiments of the present invention, it should be understood before this description that a person of ordinary skill in the art may modify the invention described herein while obtaining the technical effects of the present invention. Therefore, it should be understood that the above description is a broad disclosure to a person of ordinary skill in the art, and its contents are not intended to limit the exemplary embodiments described in the present invention.

[0055] According to the general inventive concept of the present invention, a fastener is provided, comprising a tightening member and an annular member. The tightening member is configured to be combined with a mating screw to tighten a fastened member, and a first bonding surface is formed on the first end surface of the nut. The annular member is coaxially arranged with the tightening member, and a first recessed portion is formed on the first side of the annular member, and a second bonding surface is formed at the bottom of the first recessed portion. The first bonding surface is accommodated in the first recessed portion, and the first bonding surface is combined with the second bonding surface, so that when the tightening member is loosened, the tightening member is hindered from further loosening.

[0056] According to an embodiment of the present invention, the tightening member has an outer surface in the shape of a regular quadrangular prism, a regular hexagonal prism or a plum blossom. Figure 1-7 As shown, the tightening member is a nut 1, and the nut is connected to the screw rod 100 ( Fig.18 ) thread fit. The nut 1 can be a square nut, a hexagonal nut or a plum nut. Figure 19-20 As shown, the tightening member is a bolt head 200, and the bolt head 200 is integrally connected with the screw rod 201 and rotates together. In this way, the bolt head 200 and the screw rod 201 constitute a bolt. The bolt head 200 can be a square bolt head, a hexagonal bolt head or a plum bolt head.

[0057] Refer to the following Figure 1-18 , the fastener of the embodiment of the present invention is described by taking a nut as an example of a fastening member.

[0058] like Figure 1-6 As shown, the fastener 10 includes: a nut 1 and a ring 2. The nut 1 is configured to cooperate with the screw ( Fig.18 ) is combined to fasten the fastener, the first end surface of the nut 1 ( Figure 1 The first bonding surface is formed on the lower surface of the annular member 2; the annular member 2 is coaxially arranged with the nut 1, and the first side of the annular member ( Figure 1 A first recessed portion 21 is formed on the upper side of the nut 1, and the bottom of the first recessed portion forms a second bonding surface; wherein the first bonding surface is accommodated in the first recessed portion, and the first bonding surface is combined with the second bonding surface, so that when the nut 1 is loosened, the further loosening of the nut 1 is hindered.

[0059] Those skilled in the art will appreciate that by accommodating the first mating surface of the nut 1 in the first recessed portion 21 of the annular member, a more stable positioning of the nut is achieved, and the first mating surface of the nut and the second mating surface of the annular member are hidden within the annular member, thereby reducing the possibility of foreign matter entering between the mating surfaces under harsh working conditions and affecting the performance of the fastener, making the fastener more stable and reliable.

[0060] According to an exemplary embodiment, the fastener of the present invention can be applied to working machinery, for example, as a connector for track plates and chassis parts in engineering vehicles. Due to the harsh operating conditions of working machinery, there are large vibrations and large loads during use, especially the occurrence of lateral loads, which causes the nut or bolt head in the fastener to loosen over time. By using the fastener of the embodiment of the present invention, through the cooperation of the nut or bolt head and the ring member used as a washer, when the nut or bolt head begins to loosen, the thread locking force is tightened, the nut or bolt head is inhibited from further loosening, and the fastener is more stably and reliably fastened to the screw rod 100.

[0061] The nut in the fastener can be of various shapes, such as a hexagonal nut, a square nut, or a plum-shaped nut. Figure 1 and Figure 5 The nuts shown in the illustrated embodiment are hexagonal nuts.

[0062] according to Figure 1 In an exemplary embodiment of the present invention shown in FIG. 1 , the nut 1 includes a prismatic main body 11 and a cylindrical first protrusion 12 , wherein the first protrusion 12 extends from one end of the main body 11 , and the first engaging surface is formed on an end surface of the first protrusion 12 .

[0063] According to an exemplary embodiment of the present invention, Figure 2 , 3 As shown in and 5, the first bonding surface includes a first oblique bonding surface 121 and a second blocking surface 122 extending in the circumferential direction, and the second bonding surface includes a first oblique bonding surface 211 and a second blocking surface 212 extending in the circumferential direction, wherein the first oblique bonding surface 121 of the first bonding surface is configured to cooperate and contact with the first oblique bonding surface 211 of the second bonding portion, and the second blocking surface 122 of the first bonding surface is configured to cooperate and contact with the second blocking surface 212 of the second bonding portion, so as to realize the combination of the nut and the annular member.

[0064] Fig.13 It is shown Figure 5 The geometric principle diagram of the helix angle of the first bonding surface of the nut is shown. Fig.14 1 is a geometric principle diagram showing the helix angle of the external thread of the screw matched with the nut of the embodiment of the present invention. The first oblique joint surface 121 of the first joint surface and the first oblique joint surface 211 of the second joint surface both form helical surfaces with the same helix angle to match each other. Fig.13 middle, Fig.13 The right side of the diagram shows the relationship between the unfolded dimensions of the helical surface. φ is the helical pitch angle of the first oblique joint surfaces 121 and 211. Ph is the climbing height of the helical surface, and D is the median diameter of the helical surface. Fig.14In the figure, d is the lead angle of the external thread of the screw 100 matched with the nut of the embodiment of the present invention, d is the major diameter of the thread of the screw, d1 is the minor diameter of the thread of the screw, and d2 is the pitch diameter of the thread of the screw. Since the nut 1 is matched with the screw, the lead angle of the internal thread of the nut 1 is also d.

[0065] According to an exemplary embodiment of the present invention, Figure 2 , 5 As shown, the first oblique joint surface 121 of the first joint part and the first oblique joint surface 211 of the second joint part both form helical surfaces with the same lead angle to cooperate with each other. The helical lead angle φ of the helical surface is greater than the thread lead angle d of the internal thread, and the helical rise direction of the helical surface on the second joint part of the annular member is opposite to the tightening direction of the internal thread. In this way, when the annular member 2 is stationary relative to the screw rod 100 and the nut 1 rotates relative to the screw rod 100 by a predetermined angle, the outer side of the nut 1 is relative to the annular member 2 in the axial direction ( Figure 1 The climbing height in the upward direction) is greater than the inner side of the nut relative to the thread of the screw in the axial direction ( Figure 1 Since the screw is stationary relative to the ring, the nut 1 stretches the mating screw, that is, the nut further presses the ring, which further presses the fastener. Therefore, the ring has the function of an anti-loosening washer.

[0066] Those skilled in the art can also understand that, corresponding to different helix lead angles, the thread lead angle of the internal thread of the nut connector will also be adjusted accordingly.

[0067] According to an exemplary embodiment of the present invention, the first combining portion and the matching second combining portion are both one or more, and the number of the first combining portions is equal to the number of the second combining portions.

[0068] According to an exemplary embodiment of the present invention, there are two first combining parts and two matching second combining parts.

[0069] exist Figure 1-5In the embodiments shown in , 7, and 15, there are two first joints and two second joints that match. However, the number of first joints and the number of second joints that match can also be multiple, such as four, six or more, and the multiple first joints and second joints are respectively distributed along the circumferential direction of the first joint surface and the second joint surface. Those skilled in the art will also select the number of joints according to the needs of the working conditions. For the embodiment with six joints, since the helical surface of each joint is shorter, the angle at which the nut can rotate when loosening is smaller, that is, the maximum allowable nut loosening angle is smaller, so it is suitable for applications with relatively good working conditions and high requirements for the loosening of fasteners. For the embodiment with two joints, since the helical surface of each joint is longer, the maximum allowable nut loosening angle is larger, so it is suitable for applications with relatively poor working conditions or low requirements for the loosening of fasteners. Compared with six joints, two joints can reduce the processing complexity and corresponding processing costs.

[0070] According to an exemplary embodiment of the present invention, in order to make the second blocking surfaces 122, 212 abut against each other when the nut is installed and combined with the ring member to achieve mutual positioning of the nut and the ring member, and prevent the nut from rotating relative to the ring member in the same direction as the tightening direction of the internal thread, the second blocking surfaces 122, 212 have the same angle with the horizontal plane and are both set to be obtuse angles or right angles. Figure 2 , 5 In the embodiments shown in FIGS. 8 and 11 , the angle between the second blocking surface 122 , 212 and the horizontal plane is a right angle.

[0071] According to an exemplary embodiment of the present invention, Fig. 9 As shown, a ratchet 22 is formed on the surface of the ring member on the side close to the fastened element, and the ratchet 22 is configured so that the friction between the ring member 2 and the fastened element is greater than the friction between the nut 1 and the ring member 2, so that the ring member 2 remains stationary relative to the fastened element when the nut 1 is loosened relative to the screw.

[0072] According to an exemplary embodiment of the present invention, the ratchet 22 is configured as follows: Fig. 9 As shown, the radial ratchet teeth are arranged on the surface of the ring member on the side close to the fastened element. The number of the radial ratchet teeth is greater than the number of the first joint part and the second joint part that matches. The closely arranged radial ratchet teeth generate a large friction force between the ring member 2 and the fastened element. The friction force is greater than the friction force between the nut 1 and the ring member 2, so that the ring member 2 remains stationary relative to the fastened element when the nut is loosened.

[0073] According to an exemplary embodiment of the present invention, the nut 1 has a regular quadrangular prism, a regular hexagonal prism or a plum blossom-shaped outer surface, and the outer peripheral surface of the ring is formed with a plum blossom edge, so that the wrench device drives the tightening member and the ring member to rotate together, thereby locking or loosening the nut and the ring member at the same time, which facilitates the installation and removal of the fastener.

[0074] According to an exemplary embodiment of the present invention, the number of sides of the plum blossom edge of the annular member 2 is more than three times the number of sides of the prismatic tightening member 1 .

[0075] like Fig.15 , 16 As shown, according to an exemplary embodiment, the wrench device 3 includes: a cylindrical main body; a first wrench portion 31, used to be combined with the ring member 2, the first wrench portion 31 is formed on the inner side of the first end of the main body combined with the ring member, and is formed into a plum blossom shape that matches the plum blossom edge of the ring member; and a second wrench portion 32, used to be combined with the nut, the second wrench portion 32 extends inward from the first wrench portion 31 along the axis of the main body, and is formed into a shape that matches the outer side of the nut 1. The wrench device also includes a connecting portion 33 formed on the main body, the connecting portion 33 is used to connect with an external wrench tool to screw the wrench device 3, the ring member 2 and the nut 1, and the connecting portion 33 extends from the second end of the main body opposite to the first end to the second wrench portion 32. In an alternative embodiment, a handle can be integrally provided on the main body to drive the wrench device. When the wrench device 3 is used to tighten or remove the fastener, the second blocking surface 212 of the ring 2 is brought into contact with the first blocking surface 122 of the nut, so that the nut 1 is relatively positioned with the ring 2. The first wrench portion 31 is coupled to the plum blossom edge of the outer peripheral surface of the ring, and the first wrench portion 32 is coupled to the outer surface of the main body of the nut 1, and an external wrench tool is inserted into the connecting portion 33, so that the fastener is tightened or removed by the wrench tool.

[0076] like Fig.12 and 17As shown, in an alternative embodiment, a plurality of drive holes 202 are provided on the first side of the ring member 2. Further, an annular guide groove 201 connected to the drive hole 202 is formed on the ring member 2. Accordingly, the present invention also provides a wrench device 4. The wrench device 4 comprises: a cylindrical main body 41; a wrench portion 42, formed inside the main body 41, for combining with the nut and formed into a shape matching the outer side surface of the nut 1; and a plurality of drive rods 43, extending from the end surface of the main body, the drive rods 43 are configured to match the drive hole 202 of the ring member, so that the wrench device 4 drives the ring member 2 and the nut 1 to rotate together. When the wrench device 4 is used to tighten or disassemble the fastener, the second blocking surface 212 of the ring member 2 is abutted against the first blocking surface 122 of the nut, so that the nut 1 and the ring member 2 are relatively positioned. The driving rod 43 of the wrench device 4 is inserted into the driving hole 202 of the ring member 2 along the arc-shaped guide groove 201, and the wrench part 41 is combined with the outer surface of the main body of the nut, so that the fastener is tightened or removed by the wrench device.

[0077] According to an exemplary embodiment of the present invention, Fig.15 As shown, the second wrench portion is formed as a hexagonal wrench portion.

[0078] According to an exemplary embodiment of the present invention, Fig.15 As shown, the connecting portion is formed in a quadrangular shape.

[0079] According to an exemplary embodiment of the present invention, Figure 2 , 3 As shown, the nut further includes an annular second protrusion 13, which extends from the first protrusion 12 on the inner side of the first joint surface, and the outer diameter of the second protrusion 13 is smaller than the inner diameter of the ring part 2, so that the second protrusion 13 is accommodated in the ring part 2.

[0080] According to an exemplary embodiment of the present invention, the nut 1 and the ring 2 are configured such that they cannot be completely separated.

[0081] According to an exemplary embodiment of the present invention, Figure 7 As shown, the end of the second protrusion 13 forms a flange 131 protruding outward, and the flange 131 cooperates with the second side of the annular member (such as Figure 3 The flange 131 has a shape such as the lower side of the ring 2 in the middle) to allow the nut to rotate relative to the ring but not to detach from the ring. Figure 3 The inner diameter of the ring member 2 shown is larger than the outer diameter. Figure 3The second side of the ring member ( Figure 3 131) on the bottom surface of the recessed portion of the second side of the ring 2, so that the nut 1 can rotate relative to the ring 2 but cannot be separated from the ring 2. In one embodiment, by setting the height of the gap between the flange in the axial direction and the bottom surface of the recessed portion formed on the second side of the ring 2 to be less than the height of the first and second blocking surfaces in the axial direction, the nut 1 can only rotate relative to the ring 2 within a predetermined angle range, so that the distance by which the matching screw is stretched by the nut 1 in the axial direction is less than 1.0 mm. Specifically, in the fastener according to the embodiment of the present invention, since the first oblique coupling surface 121 of the first coupling portion is configured to cooperate with the first oblique coupling surface 211 of the second coupling portion, the second blocking surface 122 of the first coupling portion is configured to cooperate with the second blocking surface 212 of the second coupling portion. In this way, when the nut 1 rotates relative to the ring 2 from the blocking surface, the nut 1 will gradually leave the ring 2, but due to the limitation of the flange 131 and the ring 2, the nut 1 can only rotate relative to the ring 2 within a predetermined angle range. In one embodiment, the maximum angle range of the nut relative to the ring is 30-70 degrees, preferably 40-70 degrees.

[0082] According to an exemplary embodiment of the present invention, the flange is formed by a stamping process after the second protrusion 13 passes through the ring from the first side of the ring to the second side.

[0083] According to an exemplary embodiment, the nut 1 and the ring member 2 may also be separate parts, which are only temporarily used together during use.

[0084] The following is combined with Figure 1-6 , 8-18 describe the operation process of the nut fastener according to an embodiment of the present invention.

[0085] like Fig.18 As shown, when the fastener of the embodiment of the present invention is applied to an engineering vehicle for fastening a fastener such as a wheel hub 4, the nut 1 and the ring 2 are aligned, that is, the second blocking surface 212 of the first joint portion is matched with the second blocking surface 122 of the second joint portion to prevent the nut from rotating relative to the ring in the same direction as the tightening direction of the internal thread of the nut. The fastener 1 is tightened as a whole onto the fastened element in the same direction as the tightening direction of the internal thread of the nut by using the wrench device 3, and a pre-tightening force is applied to clamp and tighten the fastened element.

[0086] As time goes by, the nut 1 will become loose. Since the friction between the ring 2 and the fastened element is greater than the friction between the nut and the ring, when the nut 1 initially moves relative to the ring 2, the ring 2 remains stationary relative to the screw. This initial movement is performed along the first oblique joint surface 121 of the first joint part and the first oblique joint surface 211 of the second joint part that are in contact with each other. Fig.13 and 14 As shown, since the first oblique joint surface 121 and the first oblique joint surface 211 are formed into a helical surface, the helix angle of the helical surface is greater than the thread lead angle of the internal thread. When the nut is loosened, when the nut is loosened and rotated at a certain angle, the first protrusion and the main body of the nut move along the first oblique joint surfaces 121 and 211 in the direction of the helix angle, and the climbing height of the outer side of the nut is greater than the height of the inner thread of the nut withdrawing from the outer thread of the matching screw 100, thereby forming a stretching for the matching screw. Therefore, a greater locking force is formed at the matching connection between the internal thread and the external thread, and the locking force inhibits the further loosening of the nut 1. And the matching screw generates an opposite pulling force toward the ring 2 on the nut 1, so that the nut 1 presses downward against the ring 2, and the ring 2 further presses the fastener, so the friction between the ring 2 and the fastened element is greater, inhibiting the movement of the fastener. In this way, the looser the nut is, the greater the stretching of the screw caused by the difference between the helix angle and the thread lead angle, and thus the greater the locking force, making the nut less likely to loosen.

[0087] Fig.19 is an exploded schematic diagram showing a fastener according to another exemplary embodiment of the present invention; and Fig. 20 It shows the use of Fig.19 The schematic diagram of the working principle of the fastener when fastening the fastened object is shown. Fig.19 and 20 The fastener 20 shown is Figure 1-7 The fastener 10 shown differs in that Fig.19 and 20 In the fastener 20 shown, the tightening member is a bolt head 200 which is integrally connected to a screw rod 201 and rotates together with the screw rod 201 .

[0088] See also Fig.19 and 20 The fastener 20 includes a bolt and a ring 2, wherein the bolt includes a bolt head 200 and a screw rod 201 having a threaded portion 2011 that are integrally connected and rotated together. The first end surface ( Fig.19 The first bonding surface is formed on the lower surface of the annular member. The annular member 2 is coaxially arranged with the bolt head, and the screw rod 201 passes through the through hole of the annular member. The first side ( Fig.19A first recessed portion 21 is formed on the upper side of the bolt head 200, and a second bonding surface is formed at the bottom of the first recessed portion; wherein the first bonding surface is accommodated in the first recessed portion 21, and the first bonding surface is combined with the second bonding surface, so that when the bolt head 200 is loosened, the further loosening of the bolt head 200 is hindered.

[0089] The structure and the bonding method of the first bonding surface of the bolt head and the second bonding surface in the first recessed portion 21 of the ring member are similar to Figure 1-7 The structure and combination method of the fasteners shown in are the same and will not be repeated here.

[0090] like Fig. 20 As shown, using Fig.19 When the fastener 20 shown installs the fastener 203 on the fixed frame 202 with bolt holes, first, the ring member 2 is put on the screw rod 202, and a part of the bolt head is installed in the first recessed portion 21 of the ring member 2, so that the first bonding surface is combined with the second bonding surface; then, the screw rod 201 passes through the fastener 203 and is aligned with the threaded hole on the fixed frame 202; finally, the wrench device 3 is put on the bolt head 200 of the fastener and the ring member 2 as a whole, and the wrench device 3 is rotated to apply a pre-tightening force to fasten the fastener 204 to the fixed frame 202.

[0091] According to the fasteners described in the various embodiments of the present invention, the more the fastener is loosened, the tighter the thread locking force is, through the cooperation of the tightening member and the ring member, so that the tightening member cannot be loosened, thereby playing a role in inhibiting the tightening member from further loosening. Even under harsh working conditions, safe and stable connection and fastening can be achieved. Further, by accommodating the first protrusion of the tightening member in the first recessed portion of the ring member, a more stable positioning of the tightening member is achieved, and the joint surface between the tightening member and the ring member is hidden inside the ring member, reducing the possibility of foreign matter entering between the joint surfaces under harsh working conditions and affecting the performance of the fastener, making the fastener more stable and reliable. In addition, since the fastener is a fastener that can be detached from the fastened element, its anti-loosening performance is not affected by the number of locking and loosening, and its anti-loosening performance is not affected by lubrication and the size of the pre-tightening force. Reliable connection can be maintained even in situations with severe vibration or heavy loads.

[0092] Those skilled in the art can understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing conflicts in structure or principle.

[0093] After describing the preferred embodiments of the present invention in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the appended claims, and the present invention is not limited to the exemplary embodiments described in the specification.

Claims

1. A fastener, comprising: A tightening member, configured to be combined with a mating screw to tighten a fastener, the tightening member comprising a main body and a cylindrical first protrusion, the first protrusion extending from one end of the main body, and a first engaging surface formed on an end surface of the first protrusion; as well as An annular member, the annular member is coaxially arranged with the tightening member, a first side of the annular member is formed with a first recessed portion, and a bottom of the first recessed portion forms a second bonding surface; The first combination surface is accommodated in the first recessed portion, the first combination surface is combined with the second combination surface, and the combination surface of the first combination surface and the second combination surface is at a distance from the end surface of the annular member, so that when the tightening member is loosened, the further loosening of the tightening member is hindered, and the combination surface of the tightening member and the annular member is hidden inside the annular member; The first combining surface is provided with at least one first combining portion, the second combining surface is provided with at least one second combining portion matched with the first combining portion, the first combining portion includes a first oblique combining surface and a second blocking surface extending in the circumferential direction, the second combining portion includes a first oblique combining surface and a second blocking surface extending in the circumferential direction, the first oblique combining surface of the first combining portion is configured to be matched and contacted with the first oblique combining surface of the second combining portion, and the second blocking surface of the first combining surface is configured to be matched and contacted with the second blocking surface of the second combining portion, so as to realize the combination of the tightening member and the annular member; Wherein, the first oblique joint surface of the first joint portion and the first oblique joint surface of the second joint portion both form helical surfaces with the same lead angle to match each other, the helical lead angle of the helical surface is greater than the thread lead angle of the external thread of the mating screw, and the helical rise direction of the helical surface on the second joint portion of the annular member is opposite to the tightening direction of the external thread; Wherein, the second blocking surface of the first combining portion and the second blocking surface of the second combining portion have the same included angle with the horizontal plane, and both are obtuse angles or right angles; and A ratchet is formed on the second side of the annular member opposite to the first side, and the ratchet is configured so that the friction between the annular member and the fastened element is greater than the friction between the tightening member and the annular member, so that the annular member remains stationary relative to the fastened element when the tightening member is loosened relative to the screw.

2. The fastener according to claim 1, wherein: There are two first combining parts and two matching second combining parts.

3. The fastener according to claim 1, wherein: The ratchet teeth are configured to be radially arranged on a surface of the ring member at a side close to the fastened element.

4. The fastener according to claim 1, wherein: The tightening member has a regular quadrangular prism, regular hexagonal prism or plum blossom-shaped outer surface, and the outer peripheral surface of the annular member is formed with a plum blossom edge so that the wrench device can drive the tightening member and the annular member to rotate together.

5. The fastener according to claim 4, wherein: The number of sides of the plum blossom side of the annular part is more than three times the number of sides of the prismatic tightening part.

6. The fastener according to claim 4, wherein: The wrench device comprises: A cylindrical main body; A first wrench portion, disposed inside the main body portion and configured to cooperate with the plum blossom edge of the annular member; and The second wrench portion is arranged on the inner side of the main body portion and is configured to match with the outer side surface of the tightening member.

7. The fastener according to claim 1, wherein: A plurality of driving holes are provided on a first side of the annular member.

8. The fastener according to claim 7, wherein: An arc-shaped guide groove communicating with the driving hole is also formed on the annular member.

9. The fastener according to any one of claims 1 to 8, wherein: The tightening member is a nut, and the nut is threadably matched with the matching screw.

10. The fastener according to claim 9, wherein: The nut and the ring are configured such that they cannot be completely separated.

11. The fastener according to claim 10, wherein: The tightening member further includes an annular second protrusion extending from the first protrusion at an inner side of the first coupling surface to be accommodated in the annular member.

12. The fastener according to claim 11, wherein: An end of the second protrusion forms an outwardly protruding flange, which cooperates with the second side of the ring to allow the nut to rotate relative to the ring but cannot be separated from the ring.

13. The fastener according to claim 12, wherein: The flange is formed by a stamping process after the second protrusion passes through the ring from the first side of the ring to the second side.

14. The fastener according to claim 9, wherein: The nut and the annular component are separate components.

15. The fastener according to any one of claims 1 to 8, wherein: The tightening member is a bolt head, and the bolt head is integrally connected with the matching screw and rotates together.

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