A torque overload protection device

Abstract

The present invention belongs to the field of mechanical transmission technology and relates to a torque overload protection device, comprising a first shaft and a second shaft coaxially arranged relative to each other; an overload protection assembly disposed between the first and second shafts, the overload protection assembly comprising a first disc and a second disc disposed relative to each other, and a ball; a plurality of ball sockets disposed on the opposing end surfaces of the first disc and the second disc; a ball disposed in each ball socket; an annular groove disposed on the opposing end surface of the second disc; one end of the ball disposed in the ball socket and the other end in the annular groove; torque is transmitted between the first and second discs via friction between the ball, the ball socket, and the annular groove; when overloaded, static friction between the ball, the ball socket, and the annular groove is converted to rolling friction, causing the first and second discs to rotate relative to each other, thereby achieving overload protection. The torque that the ball can transmit depends on the maximum static friction between the ball and the annular groove, and the maximum transmitted torque is controlled by changing the elastic force of the elastic member and the friction coefficient.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical transmission and relates to a torque overload protection device. Background Art

[0002] Currently, wind turbine yaw and pitch reducers lack overload protection. When exposed to high loads, the output terminals of these reducers are prone to overload failure, severely impacting the normal operation of the wind turbine. With technological advancements, some yaw and pitch reducers have internal overload weaknesses. When the load exceeds a certain value, the internal sun gear breaks, protecting the yaw or pitch bearing teeth. This structure increases wind turbine maintenance costs and frequency, severely impacting the normal operation of wind turbines and resulting in a loss of wind power generation. Summary of the Invention

[0003] In view of this, an object of the present invention is to solve the above-mentioned problem and provide a torque overload protection device.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A torque overload protection device includes a first shaft and a second shaft coaxially arranged opposite each other; an overload protection assembly is provided between the first and second shafts, and transmission is performed through the overload protection assembly; the overload protection assembly includes a first disc and a second disc arranged opposite each other, and a ball disposed between the first disc and the second disc; the first disc is fixedly connected to the first shaft; and the second disc is connected to the second shaft;

[0006] A plurality of ball sockets are provided on the end surfaces of the first and second disk bodies that are opposite to each other; a ball is provided in each ball socket; an annular groove is provided on the end surface of the second disk body that is opposite to the first disk body; one end of the ball is located in the ball socket and the other end is located in the annular groove; torque is transmitted between the first and second disk bodies through friction between the ball, the ball socket, and the annular groove; when overloaded, rolling friction is converted between the ball, the ball socket, and the annular groove, causing the first and second disk bodies to rotate relative to each other, thereby achieving overload protection;

[0007] The ball socket is provided with a first inclined surface, a second inclined surface arranged opposite to each other along the circumference of the first disk body, and a third inclined surface and a fourth inclined surface arranged opposite to each other along the radial direction of the first disk body; the first inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are all in tangential contact with the ball; the angle between the first inclined surface and the end face of the first disk body is α1, the angle between the second inclined surface and the end face of the first disk body is α2, α1>α2, the angle between the third inclined surface and the end face of the first disk body is equal to the angle between the fourth inclined surface and the end face of the first disk body.

[0008] Furthermore, the second disc is mounted on the second shaft and slidably engages with the second shaft in an axial direction. A locking nut is provided on a side of the second disc away from the first disc. The locking nut is threadably connected to the second shaft. An elastic member is provided between the locking nut and the second disc. By turning the locking nut, the elastic force exerted by the elastic member on the second disc is adjusted, thereby adjusting the pressure on the ball. The elastic member can be a conventional elastic component such as a spring.

[0009] Furthermore, half of the volume of the ball is located in the annular groove, and the depth of the ball socket is smaller than the radius of the ball.

[0010] Furthermore, a positioning washer is provided between the first disk body and the second disk body, a positioning hole is provided on the positioning coil, and the ball is located in the positioning hole.

[0011] Furthermore, one of the first shaft and the second shaft is an input shaft, and the other is an output shaft.

[0012] Furthermore, it also includes a mounting seat, in which the first shaft and the second shaft are both rotatably disposed.

[0013] Furthermore, the first shaft and the second shaft are both provided with connection holes for connecting to external devices.

[0014] Furthermore, the maximum torque that can be transmitted by the overload protection assembly is controlled by changing the sizes of α1 and α2 and the surface roughness of the ball, ball socket and annular groove.

[0015] The beneficial effects of the present invention are:

[0016] 1. This invention utilizes a ball-type overload protection assembly. The overload protection principle is that when overloaded, the ball slips, converting static friction into rolling friction, causing the transmission between the input and output shafts to disengage, thus providing torque overload protection. The torque that the ball can transmit depends on the maximum static friction between the ball and the annular groove. This maximum transmittable torque is controlled by varying the elastic force and friction coefficient of the elastic element.

[0017] 2. The ball socket of the present invention adopts an asymmetric structure, which can more accurately control the critical state of slipping of the ball, that is, the inclination angles of the first inclined surface and the second inclined surface are different, and the resultant force of the first inclined surface and the second inclined surface acting on the ball has a component along the tangential direction of the ball. When operating normally, this component is balanced by the static friction force acting on the ball. When overloaded, this component increases. When the maximum static friction force is exceeded, the ball rolls.

[0018] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0020] Figure 1 Schematic diagram of the torque overload protection device of the present invention;

[0021] Figure 2 for Figure 1 Enlarged view of point Ⅰ in the middle;

[0022] Figure 3 for Figure 2 Middle AA section view;

[0023] Figure 4 Schematic diagram of the first disk;

[0024] Figure 5 Schematic diagram of the force acting on the ball in the socket.

[0025] Figure markings: 1-mounting seat; 2-locking nut; 3-spring; 4-second disk; 41-annular groove; 5-ball; 6-first disk; 61-ball socket; 611-first inclined plane; 612-second inclined plane; 613-third inclined plane; 614-fourth inclined plane; 7-connecting screw; 8-bearing; 9-circlip; 10-first shaft; 11-sun gear; 12-circlip; 13-bearing retaining ring; 14-bearing; 15-retaining ring; 16-bearing; 17-locating washer; 18-second shaft. DETAILED DESCRIPTION

[0026] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] See also Figures 1 to 5 , is a torque overload protection device, comprising a first shaft 10 and a second shaft 18 arranged coaxially opposite to each other; an overload protection assembly is provided between the first shaft 10 and the second shaft 18, and transmission is carried out through the overload protection assembly; the overload protection assembly comprises a first disc 6 and a second disc 4 arranged opposite to each other, and a ball 5 provided between the first disc 6 and the second disc 4; the first disc 6 is fixedly connected to the first shaft 10 by a connecting screw 7; the second disc 4 is connected to the second shaft 18; the end surfaces of the first disc 6 and the second disc 4 facing each other A plurality of ball sockets 61 are provided on the upper surface; a ball 5 is placed in each ball socket 61; an annular groove 41 is provided on the end surface of the second disk body 4 opposite to the first disk body 6; one end of the ball 5 is located in the ball socket 61, and the other end is located in the annular groove 41; torque is transmitted between the first disk body 6 and the second disk body 4 through the friction between the ball 5, the ball socket 61 and the annular groove 41; when overloaded, the static friction between the ball 5, the ball socket 61 and the annular groove 41 is converted into rolling friction, so that the first disk body 6 and the second disk body 4 rotate relative to each other, thereby achieving overload protection.

[0030] Among them, the second disk body 4 is mounted on the second shaft 18 and axially slides with the second shaft 18; a locking nut 2 is provided on the side of the second disk body 4 away from the first disk body 6; the locking nut 2 is connected to the second shaft 18 through a thread; a spring 3 is provided between the locking nut 2 and the second disk body 4; by twisting the locking nut 2, the elastic force applied by the spring 3 to the second disk body 4 is adjusted, thereby adjusting the pressure on the ball 5.

[0031] In this embodiment, half the volume of the ball 5 is located in the annular groove 41, and the depth of the socket 61 is less than the radius of the ball 5. The socket 61 is provided with a first inclined surface 611 and a second inclined surface 612 arranged oppositely along the circumference of the first plate 6, and a third inclined surface 613 and a fourth inclined surface 614 arranged oppositely along the radial direction of the first plate 6. The first inclined surface 611, the second inclined surface 612, the third inclined surface 613, and the fourth inclined surface 614 all make tangential contact with the ball 5. The angle between the first inclined surface 611 and the end surface of the first plate 6 is α1, and the angle between the second inclined surface 612 and the end surface of the first plate 6 is α2, where α1>α2. The angle between the third inclined surface 613 and the end surface of the first plate 6 is equal to the angle between the fourth inclined surface 614 and the end surface of the first plate 6.

[0032] A positioning washer 17 is provided between the first plate 6 and the second plate 4 , a positioning hole is provided on the positioning coil, and the ball 5 is located in the positioning hole.

[0033] In this embodiment, both the first shaft 10 and the second shaft 18 are provided with connection holes for connecting to external devices. A sun gear 11 is mounted on the first shaft 10, serving as the power input shaft and the second shaft 18 as the output shaft. The first shaft 10 is rotatably mounted within the mounting base 1 via bearings 8 and 14, and is axially positioned by a retaining ring 9 and a retaining ring 15. The second shaft 18 is rotatably mounted within the inner hole of the first disk 6 via bearings 16, and is axially positioned by a bearing retaining ring 13 and a retaining ring 12.

[0034] The maximum torque that can be transmitted is controlled by changing the sizes of α1 and α2 and the surface roughness of the ball 5 , the ball socket 61 and the annular groove 41 .

[0035] During transmission, the first and second plates 6 and 4 transmit torque through static friction between the balls 5 and their respective contact surfaces. When overloaded, the positive pressure F1 exerted on the balls by the first inclined surface 611 increases, causing the combined force F2 exerted on the balls by the second inclined surface 612 to shift toward the latter. This creates a tendency for the balls to move toward the latter. When the maximum static friction cannot overcome this tendency, the balls 5 roll, and the friction exerted on the balls 5 shifts from static to rolling friction. Relative rotation occurs between the first leader 6 and the second plate 4, achieving overload disengagement protection.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A torque overload protection device, characterized in that: It comprises a first shaft and a second shaft coaxially arranged opposite to each other; an overload protection assembly is provided between the first shaft and the second shaft, and transmission is carried out through the overload protection assembly; the overload protection assembly comprises a first disc and a second disc arranged opposite to each other, and a ball disposed between the first disc and the second disc; the first disc is fixedly connected to the first shaft; the second disc is connected to the second shaft; A plurality of ball sockets are provided on the end surfaces of the first and second disk bodies that are opposite to each other; a ball is provided in each ball socket; an annular groove is provided on the end surface of the second disk body that is opposite to the first disk body; one end of the ball is located in the ball socket and the other end is located in the annular groove; torque is transmitted between the first and second disk bodies through friction between the ball, the ball socket, and the annular groove; when overloaded, rolling friction is converted between the ball, the ball socket, and the annular groove, causing the first and second disk bodies to rotate relative to each other, thereby achieving overload protection; The ball socket is provided with a first inclined surface and a second inclined surface arranged opposite to each other along the circumference of the first disc body, and a third inclined surface and a fourth inclined surface arranged opposite to each other along the radial direction of the first disc body; the first inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are all in tangential contact with the ball; The included angle between the first inclined surface and the end surface of the first disk body is α1, the included angle between the second inclined surface and the end surface of the first disk body is α2, α1>α2, and the included angle between the third inclined surface and the end surface of the first disk body is equal to the included angle between the fourth inclined surface and the end surface of the first disk body; The second disc is mounted on the second shaft and slidably engages with the second shaft in an axial direction. A locking nut is provided on a side of the second disc away from the first disc. The locking nut is connected to the second shaft via a thread. An elastic member is provided between the locking nut and the second disc. The elastic force applied by the elastic member to the second disc is adjusted by turning the locking nut, thereby adjusting the pressure on the ball. Half of the volume of the ball is located in the annular groove, and the depth of the ball socket is smaller than the radius of the ball; a positioning washer is also provided between the first disk body and the second disk body, and a positioning hole is provided on the positioning washer, and the ball is located in the positioning hole.

2. The torque overload protection device according to claim 1, characterized in that: One of the first shaft and the second shaft is an input shaft, and the other is an output shaft.

3. The torque overload protection device according to claim 1, characterized in that: It also includes a mounting seat, in which the first shaft and the second shaft are both rotatably disposed.

4. The torque overload protection device according to claim 1, characterized in that: The first shaft and the second shaft are both provided with connection holes for connecting with external devices.

5. The torque overload protection device according to claim 1, characterized in that: The maximum torque that can be transmitted by the overload protection component is controlled by changing the sizes of α1 and α2 and the surface roughness of the ball, the ball socket and the annular groove.

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