Vibration reduction gear with variable rigidity and damping

Abstract

The invention belongs to the technical field of gears, and particularly relates to a vibration reduction gear with variable rigidity and damping. Two ends of the through hole of the gear spoke are provided with sine-staggered curved surfaces; two pieces of sine-staggered curved surface rubber are respectively pressed at two ends of the through hole; through holes are formed in the sine staggered curved surface rubber, and the shoulder screw and the internal thread stud are respectively arranged in the through holes of the two sine staggered curved surface rubber; a convex cylindrical cavity is formed in the inner side of the spoke through hole and filled with damping particles, spherical rubber is arranged in the middle of the convex cylindrical cavity, the upper face and the lower face of the spherical rubber are round faces, and the spherical rubber makes contact with the bottom face of the sine staggered curved surface rubber. A through hole is formed in the spherical rubber, the shoulder screw and the internal thread stud extend into the centers of the two sides of the through hole of the spoke correspondingly to be in threaded fit, the extrusion degree of the screw head on the sine staggered curved surface rubber and the spherical rubber can be adjusted by adjusting the thread screwing length of the shoulder screw and the internal thread nut, and the rubber rigidity and damping are adjusted. The vibration reduction performance of the gear is improved, and impact is effectively buffered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear, in particular to a variable stiffness and damping gear. BACKGROUND

[0002] In the field of heavy load transmission such as mine machinery, port hoisting equipment, heavy rolling mill, etc., gears as core transmission components need to bear high torque, high impact and other complex working conditions for a long time. The damping performance and stiffness adaptability of such heavy load gears determine the reliability of the equipment operation. Traditional heavy load gears generally adopt rigid structure design, or only realize simple damping through single rubber pad and metal spring, and the conventional damping structure is mostly designed with plane or cylindrical surface, which has limited contact surface with the gear spoke, and stress concentration is easy to occur under heavy load. For example, the patent with the patent number "ZL200720185373.6" provides a damping and noise reduction gear, which realizes damping by arranging a circular through hole in the spoke and filling the through hole with foam aluminum damping material, but the foam aluminum is easy to loosen and break due to vibration and stress concentration.

[0003] The existing damping gears are partially filled with damping particles for damping, but the damping particles are easy to be unevenly distributed and cannot be linked with the stiffness adjustment mechanism, making it difficult to meet the energy dissipation demand under heavy load. For example, the patent with the patent number "ZL201410392495.7" provides a non-elastic collision and rolling viscous resistance particle coupling energy dissipation low noise gear, which realizes damping and noise reduction by arranging damping particles in the spoke through hole, but the gear cannot link the damping particles with the stiffness adjustment under heavy load.

[0004] The present application aims at the above problems and provides a variable stiffness and damping gear. The present application constructs a continuous and non-rhombic staggered curved surface based on a sine function as a basic waveform, which cooperates with the corresponding curved surface of the spoke through hole of the gear, so that the contact area is increased, and the stress concentration and vibration under heavy load are reduced. The damping performance is further improved by filling damping particles in the cavity of the spoke through hole, and the assembly stress and overall stiffness are adjusted by adjusting the thread engagement length of the shaft shoulder screw and the internal threaded stud, so that the unity of adjustable stiffness and damping and efficient damping is realized, and a new technology is provided for heavy load transmission gears. SUMMARY

[0005] The present application aims to provide a variable stiffness and damping gear which adjusts the stiffness of the spoke through hole by using damping materials and adjusting the thread engagement length of the shaft shoulder screw and the internal threaded stud.

[0006] The objective of this invention is achieved through the following technical solution: It includes a gear body, sinusoidal interlaced curved surface rubber, a shoulder screw, a spherical rubber, an internally threaded stud, and damping particles. The gear body has sinusoidal interlaced curved surfaces on the upper and lower sides of the spoke through-hole, which cooperate with the sinusoidal interlaced curved surface rubber to improve vibration reduction performance. The gear body has a cylindrical opening in the middle of the spoke through-hole, which is filled with damping particles. The spherical rubber is located at the center of the cylindrical opening, and its upper and lower circular surfaces contact the bottom of the sinusoidal interlaced curved surface rubber. The shoulder screw is located at the center of the spoke through-hole on one side of the gear, and the internally threaded stud is located at the center of the spoke through-hole on the other side of the gear. The two are threadedly engaged within the through-hole. By adjusting the thread engagement length of the shoulder screw and the internally threaded stud, the extrusion force of the screw head on the sinusoidal interlaced curved surface rubber and the spherical rubber is adjusted, thereby adjusting the assembly stress in the spokes and ultimately adjusting the gear stiffness and damping.

[0007] The gear body spoke through hole surface has sinusoidal interlaced curved surfaces on the upper and lower sides that cooperate with the sinusoidal interlaced curved surface rubber and are symmetrical about the through hole. The inside of the through hole is a convex cylindrical cavity. There are 8 through holes evenly distributed in the gear spoke.

[0008] The aforementioned sinusoidal staggered curved rubber side surface is a sinusoidal staggered curved surface, with two relatively symmetrical holes in each spoke through hole. Along its central axis, there are two concentric and coaxial circular holes, with a screw extending into the inner circular hole and the outer circular hole tightly attached to the screw head.

[0009] The aforementioned sinusoidal interlaced surface is based on a sine function as the fundamental waveform. It is a continuous surface formed by the intersection and superposition of several sets of waveforms in space according to specific rules. The surface is continuous as a whole, without sharp edges, which increases the contact area. The arc-shaped structure of the surface can disperse external forces along the wave direction, reduce local stress concentration, and has vibration reduction performance.

[0010] The convex cylindrical cavity is filled with damping particles, which account for 45-60% of the total cavity.

[0011] The spherical rubber has a circular plane at the top and bottom, a circular through hole at the central axis, and is embedded in a convex cylindrical cavity. The top and bottom planes are in contact with the bottom surface of the sinusoidal interlaced curved rubber, respectively.

[0012] The shoulder screw is located at the center of the spoke through hole, with the screw head in close contact with the outer circular hole of the sinusoidal interlaced curved rubber. Its screw rod passes through the inner circular hole and the spherical rubber through hole and is screwed into the internal threaded bolt. By adjusting the thread engagement length, the degree of compression on the rubber spring can be adjusted, thereby achieving the adjustment of stiffness and damping.

[0013] The effective effects of this invention are as follows: The gear spokes have sinusoidal staggered curved surfaces at both ends of the through hole, with two sinusoidal staggered curved surface rubbers pressed into each end of the through hole. The sinusoidal staggered curved surface rubbers have through holes, into which shoulder screws and internally threaded studs are respectively installed. A convex cylindrical cavity is located inside the spoke through hole, filled with damping particles. A spherical rubber spring is located in the center of the convex cylindrical cavity, with its upper and lower surfaces being circular and in contact with the bottom surface of the sinusoidal staggered curved surface rubber. The spherical rubber spring has a through hole, into which the shoulder screw and internally threaded stud extend from the center of both sides of the spoke through hole for threaded engagement. By adjusting the thread engagement length of the shoulder screw and internally threaded nut, the degree of compression of the sinusoidal staggered curved surface rubber and the spherical rubber by the screw head can be adjusted, thereby adjusting the rubber stiffness and damping, improving the gear's vibration reduction performance, and effectively buffering impacts. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a vibration damping gear with variable stiffness and damping as described in this invention. Figure 2 This is a cross-sectional view of a variable stiffness and damping vibration-damping gear according to the present invention. Figure 3 This is a schematic diagram of the structure of the through hole in the gear spokes described in this invention; Figure 4 This is a schematic diagram of the sinusoidal interlaced curved surface rubber structure described in this invention.

[0015] In the attached diagram: 1. Gear body; 2. Sinusoidal interlaced surface rubber; 21. Sinusoidal interlaced surface; 22. Inner hole; 23. Outer hole; 3. Shoulder screw; 4. Spherical rubber; 5. Internal threaded stud; 6. Damping particles; 7. Convex cylindrical cavity. Detailed Implementation

[0016] To make the objectives, features, and advantages of this invention clearer and easier to understand, the following description will be provided in conjunction with the accompanying drawings. Figures 1-4 The technical solution of the present invention will be clearly and completely described.

[0017] This invention belongs to the field of gear technology and is applicable to heavy-duty gears. Specifically, it relates to a variable stiffness and damping vibration-damping gear that changes the gear stiffness and damping by adjusting the thread engagement length between the shoulder screw and the internal threaded stud to compress the rubber spring.

[0018] A variable stiffness and damping vibration-damping gear of the present invention includes a gear body 1, a sinusoidal interlaced curved surface rubber 2, a shoulder screw 3, a spherical rubber 4, an internally threaded stud 5, and damping particles 6. The gear body 1 has sinusoidal interlaced curved surfaces on the upper and lower sides of the spoke through-hole, which cooperate with the sinusoidal interlaced curved surface rubber 2 to improve vibration damping performance. The gear body 1 has a cylindrical opening in the middle of the inner side of the spoke through-hole, which is filled with damping particles 6. The spherical rubber 4 is located at the center of the cylindrical opening, and its upper and lower circular surfaces are in contact with the bottom of the sinusoidal interlaced curved surface rubber 2. The shoulder screw 3 is located at the center of the spoke through-hole on one side of the gear, and the internally threaded stud 5 is located at the center of the spoke through-hole on the other side of the gear. The two are threadedly engaged in the through-hole. By adjusting the thread engagement length of the shoulder screw 3 and the internally threaded stud 5, the squeezing force of the screw head on the sinusoidal interlaced curved surface rubber 2 and the spherical rubber 4 is adjusted, the assembly stress in the spoke is adjusted, and thus the gear stiffness and damping are adjusted.

[0019] The side of the sinusoidal interlaced curved surface rubber 2 is a sinusoidal interlaced curved surface 21. There are two relatively symmetrical holes in each spoke through hole. Along its central axis, there are two concentric and coaxial circular holes. The inner circular hole 22 extends into the screw rod, and the outer circular hole 23 is in close contact with the screw head.

[0020] The gear body 1 has eight evenly spaced through holes inside its spokes. Each through hole has a sinusoidal interlaced curved surface on its upper and lower sides. The sinusoidal interlaced curved surface is based on a sine function waveform, and several waveforms are superimposed to form a continuous, edgeless curved surface, which increases the contact area between the spoke through holes and the sinusoidal interlaced curved surface rubber 2 compared to a traditional circular surface. Inside the through holes is a convex cylindrical cavity 7, which contains damping particles 6 and spherical rubber 4. The damping particles 6 fill 45-60% of the cavity, and a certain gap is maintained between the particles to dissipate energy during vibration. The spherical rubber 4 is embedded in the middle of the convex cylindrical cavity 7. Its top and bottom are circular planes, and they are in contact with the bottom of the sinusoidal interlaced curved surface rubber 2 on the upper and lower sides, respectively. The center of the spherical rubber 4 has a circular through hole, which is coaxial with and has the same diameter as the inner circular hole 22 of the sinusoidal interlaced curved surface rubber 2, allowing the screw of the shoulder screw 3 to pass through.

[0021] The shoulder screw 3 extends from the center of the spoke through hole on one side of the gear body 1, passes through the inner circular hole 22 of the sinusoidal interlaced curved surface rubber 2 and the center through hole of the spherical rubber 4 in sequence, and then engages with the internal threaded stud 5 at the center of the spoke through hole on the other side of the gear body 1. The compression control of the rubber is achieved by the engagement length of the two.

[0022] By adjusting the thread engagement length between the shoulder screw 3 and the internal thread stud 5, the compressive force exerted by the screw head on the sinusoidal interlaced surface rubber 2 and the spherical rubber 4 can be adjusted. When the engagement length increases, the relative distance between the shoulder screw 3 and the internal thread stud 5 shortens, increasing the compressive force on the sinusoidal interlaced surface rubber 2 and the spherical rubber 4. This causes elastic deformation of the rubber components, increases the assembly stress in the spokes, and increases the overall stiffness and damping of the gear. When the engagement length decreases, the compressive force decreases, the deformation of the rubber components recovers, the assembly stress in the spokes decreases, and the overall stiffness and damping of the gear decrease.

[0023] During heavy-load transmission, external impact loads are transmitted to the spokes through the gear body 1. The sinusoidal interlaced curved surface rubber 2 disperses the load along the wave direction through its continuous curved surface structure, reducing local stress concentration. Simultaneously, the elastic deformation of the rubber buffers and reduces vibration. The spherical rubber 4 deforms synchronously under the compression of the upper and lower sinusoidal interlaced curved surface rubber 2, further enhancing the elastic buffering effect. During vibration, the damping particles 6 within the convex cylindrical cavity 7 dissipate vibration energy through mutual collision and friction, achieving efficient vibration reduction in conjunction with the elastic buffering of the rubber. If the operating load changes, the gear stiffness and damping can be altered by adjusting the engagement length of the shoulder screw 3 and the internal thread stud 5 to adapt to the new operating conditions and improve transmission stability.

[0024] This embodiment achieves dynamic adjustment of gear stiffness and damping and efficient vibration reduction under heavy load scenarios through the synergistic effect of various components. Its structural design can be adaptively adjusted according to the parameter requirements of heavy load equipment, and all of these fall within the protection scope of this invention.

Claims

1. A vibration damping gear with variable stiffness and damping, characterized in that, The gear body (1) includes a gear body (1), a sinusoidal interlaced surface rubber (2), a shoulder screw (3), a spherical rubber (4), an internally threaded stud (5), and damping particles (6). The gear body (1) has sinusoidal interlaced surfaces on the upper and lower sides of the spoke through-hole, which cooperate with the sinusoidal interlaced surface rubber (2) to improve vibration damping performance. The gear body (1) has a cylindrical opening in the middle of the spoke through-hole, which is filled with damping particles (6). The spherical rubber (4) is located at the center of the cylindrical opening. The upper and lower circular surfaces are in contact with the bottom of the sinusoidal interlaced curved surface rubber (2); the shoulder screw (3) is in the center of the through hole on one side of the gear spoke, and the internal thread stud (5) is in the center of the through hole on the other side of the gear spoke. The two are threaded in the through hole. By adjusting the thread engagement length of the shoulder screw (3) and the internal thread stud (5), the squeezing force of the screw head on the sinusoidal interlaced curved surface rubber (2) and the spherical rubber (4) is adjusted, the assembly stress in the spoke is adjusted, and the gear stiffness and damping are adjusted.

2. The variable stiffness and damping damping gear according to claim 1, characterized in that: The gear body (1) has sinusoidal interlaced curved surfaces on the upper and lower sides of the spoke through hole that are in sync with the sinusoidal interlaced curved surface rubber and symmetrical about the through hole. The inside of the through hole is a convex cylindrical cavity (7). There are 8 through holes evenly distributed in the gear spoke.

3. The variable stiffness and damping damping gear according to claim 1, characterized in that: The side surface of the sinusoidal interlaced curved surface rubber (2) is a sinusoidal interlaced curved surface (21), which has two relatively symmetrical holes in each spoke through hole. Along its central axis, there are two concentric and coaxial circular holes, and the inner circular hole (22) extends into the screw rod, while the outer circular hole (23) is in close contact with the screw head.

4. A vibration damping gear with variable stiffness and damping according to claim 3, characterized in that: The sinusoidal interlaced surface rubber (2) has a sinusoidal interlaced surface (21) based on a sine function as the basic waveform. It is a continuous surface formed by several sets of waveforms intersecting and superimposing in space according to specific rules. The surface is continuous as a whole, without sharp edges, which increases the contact area. The arc structure of the surface can disperse external forces along the wave direction, reduce local stress concentration, and has vibration reduction performance.

5. A vibration damping gear with variable stiffness and damping according to claim 2, characterized in that: The convex cylindrical cavity (7) is filled with damping particles (6), and the damping particles (6) account for 45-60%.

6. A vibration damping gear with variable stiffness and damping according to claim 1, characterized in that: The spherical rubber (4) has a circular plane at the top and bottom, and a circular through hole on the central axis. It is embedded in the convex cylindrical cavity (7). The top and bottom planes are in contact with the bottom surface of the sinusoidal interlaced curved surface rubber (2).

7. A vibration damping gear with variable stiffness and damping according to claim 1, characterized in that: The shoulder screw (3) is located at the center of the spoke through hole. The screw head is in close contact with the outer circular hole (23) of the sinusoidal interlaced curved surface rubber (2). Its screw rod passes through the inner circular hole (22) and the through hole of the spherical rubber (4) and is screwed into the internal thread stud (5). By adjusting the thread engagement length, the degree of compression of the screw head on the rubber can be adjusted, thereby realizing the adjustment of stiffness and damping.

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