Tailless bolt sleeve

Abstract

The utility model discloses a tailless bolt sleeve, which is characterized in that a steel wire is rolled into a spring-shaped annular thread sleeve, a notch is arranged on the inner side of the tail end of the steel wire and is a force application groove, external threads of the annular thread sleeve are standard threads, and internal threads of the annular thread sleeve are spiralock threads. The bolt sleeve is reasonable and ingenious in structural design, the force application groove formed in the tail end of the steel wire provides a force application point for installation of the bolt sleeve, disassembly and assembly of the bolt sleeve are facilitated, shearing is not needed, burrs cannot be generated to scratch the bolt, the spiralock threads have good anti-loosening performance, the spiralock threads are used for aluminum alloy machine bodies and high-strength fastening bolts, and the service life of the spiralock threads is prolonged. And the overall connection strength can be improved.

Description

Technical Field

[0001] This utility model relates to a tailless bolt sleeve, belonging to the field of fastener technology. Background Technology

[0002] Wire bolt inserts are made of diamond-shaped steel wire, mechanically coiled into a spring-like thread. During installation, the insert is placed into the bolt hole using an installation tool, and then the bolt is screwed in, allowing the wire bolt to fit between the bolt and the hole. This increases the contact area, improving the strength and wear resistance of the threaded connection. Traditional bolt inserts, for ease of installation, have a bent section of wire at the end. After installation, this wire is cut, leaving burrs that can easily scratch the bolt. Furthermore, once installed, these inserts are difficult to remove and replace.

[0003] Bolt sleeves used in photovoltaic gearboxes are prone to slippage due to prolonged vibration, especially those with a diamond cross-section. This leads to loose bolts, affecting the normal operation of the gearbox, increasing maintenance frequency, and reducing work efficiency. Therefore, a bolt sleeve that prevents loosening and is easy to install and remove is needed. Utility Model Content

[0004] To overcome the above-mentioned shortcomings, this utility model provides a tailless bolt sleeve that is not easy to loosen and is easy to disassemble and assemble.

[0005] To achieve this objective, the structure adopted in this utility model is as follows: a tailless bolt sleeve, which is a ring-shaped threaded sleeve made of steel wire coiled into a spring shape. A notch is provided on the inner side of the end of the steel wire, which is a force-applying groove. The outer thread of the ring-shaped threaded sleeve is a standard thread, and the inner thread is a Spirod thread.

[0006] The steel wire has a longitudinal section with a first contact surface, a second contact surface, a third contact surface, a fourth contact surface, and a fifth contact surface. The first contact surface and the second contact surface are connected by an arc transition. The second contact surface and the third contact surface form a 120° angle. The third contact surface and the fourth contact surface form a 60° angle, and the connection between the third contact surface and the fourth contact surface is an arc transition. The connection between the fourth contact surface and the fifth contact surface is an arc transition. The fifth contact surface and the first contact surface form a 60° angle, and the connection between the fifth contact surface and the first contact surface is an arc transition.

[0007] On the annular threaded sleeve, the fourth contact surface of the upper steel wire and the second contact surface of the lower steel wire form a 90° angle, and the fourth contact surface of the upper steel wire and the third contact surface of the lower steel wire form a 60° angle.

[0008] Its beneficial effects are: the structure of this utility model is reasonable and ingenious. The force groove set at the end of the steel wire provides a force point for the installation of the bolt sleeve, which facilitates the installation and removal of the bolt sleeve. There is no need to cut it, and no burrs will be generated to scratch the bolt. The Threaded Thread has good anti-loosening performance. It can be used in aluminum alloy bodies and high-strength fastening bolts to improve the overall connection strength. Attached Figure Description

[0009] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0010] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0011] Figure 2 This is a sectional view of the present invention;

[0012] Figure 3 This is a cross-sectional view of the steel wire. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0014] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components; a fixed connection can be welding or adhesive bonding. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0016] like Figure 1 , Figure 2The tailless bolt sleeve shown is a ring-shaped threaded sleeve made of steel wire 1 wound into a spring shape. A notch is provided on the inner side of the end of steel wire 1, serving as a force-applying groove 2. The side of the force-applying groove 2 near the end of steel wire 1 forms an acute angle. After the installation tool is inserted into the force-applying groove 2, the entire ring-shaped threaded sleeve rotates within the bolt hole due to the acute angle of pull with the force-applying groove 2. This facilitates the installation and removal of the threaded sleeve without the need for tail cutting, reducing the generation of burrs on the end face of steel wire 1 and preventing scratches on the bolt. The outer thread 3 of the ring-shaped threaded sleeve is a standard thread, and the inner thread 4 is a Spilock thread. Spilock threads have excellent anti-loosening properties. While the material for general nuts is austenitic stainless steel (A2-70) with a strength of 700MPa, using a tailless bolt sleeve with Spilock threads can achieve a strength of 1040MPa, i.e., grade 10, suitable for connecting aluminum alloy bodies and high-strength fastening bolts.

[0017] like Figure 3 As shown, the steel wire 1 has a longitudinal section with a first contact surface 11, a second contact surface 12, a third contact surface 13, a fourth contact surface 14, and a fifth contact surface 15. The connection end between the first contact surface 11 and the second contact surface 12 is an arc transition; the second contact surface 12 and the third contact surface 13 form a 120° angle; the third contact surface 13 and the fourth contact surface 14 form a 60° angle, and the connection end between the third contact surface 13 and the fourth contact surface 14 is an arc transition; the connection end between the fourth contact surface 14 and the fifth contact surface 15 is an arc transition; the fifth contact surface 15 and the first contact surface 11 form a 60° angle, and the connection end between the fifth contact surface 15 and the first contact surface 11 is an arc transition. The arc transition connecting each contact surface ensures the wedge-shaped structure of the Spilock thread while increasing the contact points between the bolt and the threaded sleeve, making bolt installation smoother, preventing jamming during installation, and increasing structural strength.

[0018] On the annular threaded sleeve, the fourth contact surface of the upper steel wire and the second contact surface of the lower steel wire form a 90° angle, and the fourth contact surface of the upper steel wire and the third contact surface of the lower steel wire form a 60° angle.

[0019] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A tailless bolt sleeve, characterized in that, A spring-shaped annular threaded sleeve is made by winding steel wire (1). A notch is provided on the inner side of the end of the steel wire (1), which is a force-applying groove (2). The outer thread (3) of the annular threaded sleeve is threaded, and the inner thread (4) is a Spitzer thread. The longitudinal section of the steel wire (1) is provided with a first contact surface (11), a second contact surface (12), a third contact surface (13), a fourth contact surface (14), and a fifth contact surface (15). The connection end between the first contact surface (11) and the second contact surface (12) is arc-shaped. The contact surface (12) and the third contact surface (13) form a 120° angle; the third contact surface (13) and the fourth contact surface (14) form a 60° angle, and the connection end of the third contact surface (13) and the fourth contact surface (14) forms an arc transition; the connection end of the fourth contact surface (14) and the fifth contact surface (15) forms an arc transition; the fifth contact surface (15) and the first contact surface (11) form a 60° angle, and the connection end of the fifth contact surface (15) and the first contact surface (11) forms an arc transition.

2. The tailless bolt sleeve according to claim 1, characterized in that, Between the upper and lower adjacent steel wires of the annular threaded sleeve, the fourth contact surface of the upper steel wire and the second contact surface of the lower steel wire form a 90° angle, and the fourth contact surface of the upper steel wire and the third contact surface of the lower steel wire form a 60° angle.

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