Clamping type lock nut for wind power gearbox

Abstract

The utility model discloses a kind of clamping type locknut for wind power variable speed gearbox, it is related to fastener technical field.The clamping type locknut for wind power variable speed gearbox, including: bolt body, further include: nut body, screw is set on bolt body, the nut body moves along bolt body axial direction.This kind of clamping type locknut for wind power variable speed gearbox, by rotating nut body, make nut body move on bolt body, make elastic clamping arm and variable speed gearbox surface extrusion fixed, then in rotating lock sleeve, lock sleeve extrusion elastic clamping arm surface in the process of rotation, under the cooperation of the inclined surface on lock sleeve, elastic clamping arm is contracted and exerts pressure block to nut body, so that the thread on nut body and bolt body and thread groove are extruded and attached closely, increase the friction between thread and thread groove, effectively prevent the loosening of nut, improve the fixing effect of nut body.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, specifically a clamping anti-loosening nut for wind turbine gearboxes. Background Technology

[0002] Nuts, as a basic and critical fastening element, are widely used in various mechanical equipment. In the wind power field, the gearbox is the core component of the wind turbine generator set, and the reliability of the connection of its internal gears, bearings and other components is directly related to the safe operation of the entire unit.

[0003] Currently, due to the instability of wind loads and the vibration generated by gear meshing, there are long-term severe and variable vibrations and impact loads inside the gearbox. Under such harsh working conditions, traditional ordinary nuts are easily loosened by vibration, resulting in a decrease in preload and even connection failure, causing serious equipment accidents, which makes the anti-loosening effect of ordinary nuts poor. Utility Model Content

[0004] The purpose of this invention is to provide a clamping anti-loosening nut for wind turbine gearboxes to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a clamping anti-loosening nut for a wind turbine gearbox, comprising: a bolt body, and further comprising: a nut body, threadedly disposed on the bolt body, the nut body being movable along the axial direction of the bolt body; a plurality of elastic clamping arms disposed on the nut body, the plurality of elastic clamping arms being evenly distributed around the nut body as a center, the elastic clamping arms being inclinedly disposed; and a locking sleeve, threadedly disposed on the bolt body, the locking sleeve being configured such that when rotated, the inner surface of the locking sleeve abuts against the surface of the elastic clamping arms, thereby fixing the nut body.

[0006] Preferably, the bolt body is provided with a limiting structure to restrict the locking sleeve from disengaging.

[0007] Preferably, the limiting structure includes: a plurality of limiting through holes, which are opened through the bolt body and are evenly distributed along the axial direction of the bolt body; and a limiting strip, which is inserted into the limiting through holes and whose surface abuts against the surface of the locking sleeve.

[0008] Preferably, the two ends of the limiting strip are bent.

[0009] Preferably, it further includes: an inclined surface formed on the inner surface of the locking sleeve, the inner surface of the inclined surface being in contact with the surface of the elastic clamping arm; and friction texture formed on the surface of the locking sleeve.

[0010] Preferably, it further includes: a clearance groove formed on the nut body, wherein the elastic clamping arm is located inside the clearance groove.

[0011] Preferably, the plurality of elastic clamping arms are arranged in a tapered shape.

[0012] Preferably, the bolt body, nut body, locking sleeve, and elastic clamping arm can be made of high-strength alloy steel.

[0013] Preferably, the limiting strip can be made of high carbon steel wire or spring steel strip.

[0014] This utility model provides a clamping anti-loosening nut for wind turbine gearboxes, which has the following advantages:

[0015] (1) This utility model rotates the nut body, causing the nut body to move on the bolt body, so that the elastic clamping arm is pressed and fixed to the surface of the gearbox. Then, the locking sleeve is rotated, and the locking sleeve presses the surface of the elastic clamping arm during the rotation. With the cooperation of the inclined surface on the locking sleeve, the elastic clamping arm retracts and applies pressure to the nut body, so that the threads and thread grooves on the nut body and the bolt body are tightly pressed and fitted, increasing the friction between the threads and thread grooves, effectively preventing the nut from loosening, and improving the fixing effect of the nut body.

[0016] (2) By setting the limiting through hole and the limiting strip, this utility model can limit the locking sleeve and prevent the locking sleeve from loosening, thereby further improving the anti-loosening effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram showing the overall structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the internal structure of the nut body and locking sleeve of this utility model.

[0020] In the diagram: 1. Bolt body; 2. Nut body; 3. Elastic clamping arm; 4. Locking sleeve; 5. Inclined surface; 6. Limiting through hole; 7. Limiting strip; 8. Friction texture; 9. Clearance groove. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: Referring to 1-3, in this embodiment, a clamping anti-loosening nut for a wind turbine gearbox includes: a bolt body 1, and a nut body 2, which is threaded onto the bolt body 1 and moves axially along the bolt body 1; a plurality of elastic clamping arms 3 are disposed on the nut body 2, and the inclination angle of the elastic clamping arms 3 should be optimized, usually between 15° and 30°, to ensure that sufficient radial force can be generated under the pressure of the locking sleeve 4, while avoiding excessive stress concentration. The plurality of elastic clamping arms 3 are evenly distributed around the nut body 2 as the center, and the elastic clamping arms 3 are inclined.

[0023] The locking sleeve 4 is threaded onto the bolt body 1. When the locking sleeve 4 is rotated, the inner surface of the locking sleeve 4 abuts against the surface of the elastic clamping arm 3 to fix the nut body 2. The elastic clamping arm 3 is tapered in shape.

[0024] Among them, the threaded pair between the bolt body 1, the nut body 2, and the locking sleeve 4 can be made of fine thread to provide more precise axial movement control and higher self-locking performance. The bolt body 1, the nut body 2, the locking sleeve 4, and the elastic clamping arm 3 can be made of high-strength alloy steel, such as 42CrMo or 35CrMo, and are subjected to quenching and tempering heat treatment to obtain high strength and good toughness to withstand the complex alternating loads of the wind turbine gearbox.

[0025] The bolt body 1 is provided with a limiting structure to prevent the locking sleeve 4 from disengaging. The function of this limiting structure is to prevent the locking sleeve 4 from being completely unscrewed from the bolt body 1 and lost under vibration, while ensuring that it has sufficient stroke to press the elastic clamping arm 3. In addition to the specific structure described below, the limiting can also be achieved by riveting a retaining ring or machining a flange at the end of the bolt body 1.

[0026] The limiting structure includes: several limiting through holes 6, which are opened through the bolt body 1. The number of limiting through holes 6 is usually 2-4, symmetrically distributed to ensure balanced force. The limiting through holes 6 are evenly distributed along the axial direction of the bolt body 1; and a limiting strip 7, which is inserted into the limiting through holes 6. The limiting strip 7 can be made of high carbon steel wire or spring steel strip, has a certain rigidity, and can effectively resist the impact of the locking sleeve 4. The surface of the limiting strip 7 abuts against the surface of the locking sleeve 4. During installation, after the limiting strip 7 passes through the through hole, its two ends are bent, thereby firmly fixing it to the bolt body 1.

[0027] The two ends of the limit strip 7 are bent. The bending can be a 90° right angle bend or it can be bent and hooked into the groove on the outer wall of the bolt body 1. This mechanical interlocking method is simple and reliable, avoiding the strength problems and high temperature failure risks that may be caused by using welding or adhesives.

[0028] It also includes: an inclined surface 5, which is formed on the inner surface of the locking sleeve 4. The taper of the inclined surface 5 should match the inclination angle of the elastic clamping arm 3 to ensure surface contact, uniform pressure transmission, and avoid local wear caused by point contact. The inner surface of the inclined surface 5 is in contact with the surface of the elastic clamping arm 3. Friction texture 8 is formed on the surface of the locking sleeve 4. The friction texture 8 can be knurled, straight, or cross-knitted, with a moderate depth to increase the friction during manual operation or tool clamping and prevent slippage. The surface of the locking sleeve 4 can be blackened or phosphated to improve corrosion resistance.

[0029] It also includes: a relief groove 9, which is formed on the nut body 2. The relief groove 9 provides space for the radial deformation of the elastic clamping arm 3, which is the key structure that enables it to achieve elastic contraction. The elastic clamping arm 3 is located inside the relief groove 9. The depth and width of the relief groove 9 must be greater than the expected maximum deformation of the elastic clamping arm 3 to prevent the clamping arm from interfering with the nut body 2 when under pressure, and to ensure that the locking action is smooth and effective.

[0030] This utility model provides a clamping anti-loosening nut for wind turbine gearboxes, and its working principle is as follows:

[0031] During installation, first screw the nut body 2 into the bolt body 1 and tighten it to the specified torque, so that the end face of the nut body 2 is in contact with the surface of the connected part. At this time, one end of the elastic clamping arm 3 is in close contact with the surface of the connected part. Then, use a tool or manually tighten the locking sleeve 4 to move it from the bolt body 1 towards the nut body 2. The inclined surface 5 of the inner wall of the locking sleeve 4 presses against the outer surface of the elastic clamping arm 3, forcing all the elastic clamping arms 3 to contract radially towards the center of the bolt axis at the same time. The contracted elastic clamping arms 3 press against the inner surface of the nut body 2. The bolt body 1 is pressed tightly against the thread, generating a huge normal pressure and friction, thus forming a reliable anti-loosening locking effect. After the fixing is completed, the worker inserts the limiting strip 7 into the corresponding limiting through hole 6, so that the surface of the limiting strip 7 fits tightly against the locking sleeve 4. Then, the two ends of the limiting strip 7 are bent to limit the locking sleeve 4. When disassembling, the limiting strip 7 is pulled out and the locking sleeve 4 is loosened in the opposite direction to release the pressure on the elastic clamping arm 3. The elastic clamping arm 3 returns to its original shape by its own elasticity, and the nut body 2 can be easily unscrewed.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clamping anti-loosening nut for a wind turbine gearbox, comprising: Bolt body (1), characterized in that it further includes: The nut body (2) is threaded onto the bolt body (1), and the nut body (2) moves axially along the bolt body (1); A plurality of elastic clamping arms (3) are disposed on the nut body (2), and the plurality of elastic clamping arms (3) are evenly distributed with the nut body (2) as the center, and the elastic clamping arms (3) are inclined. The locking sleeve (4) is threaded onto the bolt body (1). When the locking sleeve (4) is rotated, the inner surface of the locking sleeve (4) abuts against the surface of the elastic clamping arm (3) so that the nut body (2) is fixed.

2. The clamping anti-loosening nut for a wind turbine gearbox according to claim 1, characterized in that: The bolt body (1) is provided with a limiting structure to restrict the locking sleeve (4) from disengaging.

3. The clamping anti-loosening nut for a wind turbine gearbox according to claim 2, characterized in that: The limiting structure includes: A plurality of limiting through holes (6) are opened through the bolt body (1), and the plurality of limiting through holes (6) are evenly distributed along the axial direction of the bolt body (1); The limiting strip (7) is inserted into the limiting through hole (6), and the surface of the limiting strip (7) abuts against the surface of the locking sleeve (4).

4. The clamping anti-loosening nut for a wind turbine gearbox according to claim 3, characterized in that: The two ends of the limiting strip (7) are bent.

5. The clamping anti-loosening nut for a wind turbine gearbox according to claim 1, characterized in that: Also includes: An inclined surface (5) is formed on the inner surface of the locking sleeve (4), and the inner surface of the inclined surface (5) is in contact with the surface of the elastic clamping arm (3).

6. The clamping anti-loosening nut for a wind turbine gearbox according to claim 1, characterized in that: Also includes: The clearance groove (9) is formed on the nut body (2), and the elastic clamping arm (3) is located inside the clearance groove (9).

7. The clamping anti-loosening nut for a wind turbine gearbox according to claim 1, characterized in that: Also includes: Friction marks (8) are formed on the surface of the locking sleeve (4).

8. A clamping anti-loosening nut for a wind turbine gearbox according to claim 5, characterized in that: The elastic clamping arms (3) are generally arranged in a conical shape.

9. A clamping anti-loosening nut for a wind turbine gearbox according to claim 1, characterized in that: The bolt body (1), nut body (2), locking sleeve (4) and elastic clamping arm (3) can be made of high-strength alloy steel.

10. A clamping anti-loosening nut for a wind turbine gearbox according to claim 3, characterized in that: The limiting strip (7) can be made of high carbon steel wire or spring steel strip.

Images