High speed pull rod coupling

Abstract

The utility model relates to a kind of high-speed pull rod coupling, including pull rod, bush, outer sleeve and long bolt, the bush is hollow cylindrical, two groups the bush is mirror-symmetrical and is sleeved in the end of transmission shaft and driving shaft, the sidewall of the bush is provided with slot along axial direction, the outer diameter of two groups the bush is gradually increasing, two groups The outer sleeve is one-to-one corresponding and is sleeved on two groups bush, the opposite end of two groups the bush is provided with bottom hole, several the pull rod end interference assembly is in the bottom hole of two groups bush, flange is provided on the outer sleeve, several The long bolt is used to connect the flange of two groups the outer sleeve. Improve transmission performance, stable transmission high torque, eliminate relative motion between parts, still keep high transmission accuracy under dynamic load;Optimize dynamic characteristics.

Description

Technical Field

[0001] This utility model relates to the field of coupling technology, and in particular to a high-speed tie rod coupling. Background Technology

[0002] A coupling, also known as a shaft coupling, is a mechanical component used to securely connect the driving and driven shafts in different mechanisms, enabling them to rotate together and transmit motion and torque. It is sometimes also used to connect shafts to other parts (such as gears and pulleys). A coupling typically consists of two halves, each connected by a key or tight fit to the two shaft ends, and then joined together by bolts or other connecting parts. Couplings require high assembly precision; any slight deviation (such as installation errors or thermal expansion) can generate additional loads, leading to vibration, noise, or even equipment damage. Furthermore, existing couplings lack misalignment compensation capabilities: they cannot accommodate axial, radial, or angular displacements, and are prone to failure under high speeds or dynamic loads due to minor misalignments. Therefore, improvements are needed. Utility Model Content

[0003] Therefore, it is necessary to provide a high-speed tie rod coupling to address the above problems.

[0004] A high-speed tie rod coupling includes tie rods, bushings, outer sleeves, and long bolts. The bushings are hollow cylinders, and two sets of bushings are mirror-symmetrically fitted onto the ends of a drive shaft and a drive shaft. The sidewalls of the bushings are provided with slots along the axial direction. The outer diameters of the two sets of bushings gradually increase towards each other. The two sets of outer sleeves are fitted onto the two sets of bushings in a one-to-one correspondence. The opposite ends of the two sets of bushings are provided with bottom holes. Several tie rods are interference-fitted into the bottom holes of the two sets of bushings at both ends. The outer sleeves are provided with flanges, and several long bolts are used to connect the flanges of the two sets of outer sleeves.

[0005] Preferably, the number of tie rods is four, and the number of long bolts is six.

[0006] Preferably, the slots on a set of bushings are bidirectional and staggered.

[0007] Preferably, the root of the groove is arc-shaped.

[0008] Preferably, the pull rod has an arc-shaped design, with the diameters at both ends being larger than the diameter in the middle.

[0009] The advantages of this utility model are: improved transmission performance, the interference fit between the tie rod and the bushing creates a frictional self-locking effect, stably transmitting high torque, eliminating relative movement between parts, and the radial compressive stress generated by the interference fit ensures the coaxiality error of the rotating shaft, maintaining high transmission accuracy under dynamic loads; optimized dynamic characteristics, the slots on the bushing can absorb impact loads and reduce the amplitude of shaft rotation vibration, and the step-by-step tightening process of the flange improves the uniformity of clamping force and reduces the risk of resonance; provided dynamic compensation function, the symmetrical layout of the tie rod achieves angular compensation, and the slots in the bushing provide displacement compensation, adapting to the thermal expansion and misalignment errors of the equipment; enhanced structural reliability, the interference fit system of the outer sleeve and the long bolts prevent axial movement and loosening failure under dynamic loads. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the assembly of a high-speed tie rod coupling with a drive shaft and a drive shaft, as shown in one embodiment.

[0011] Figure 2 This is a schematic diagram of an explosion of a high-speed tie rod coupling;

[0012] Figure 3 This is a cross-sectional view of a high-speed tie rod coupling. Detailed Implementation

[0013] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0014] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0015] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0016] like Figures 1-3 As shown, a high-speed tie rod coupling includes tie rods 1, bushings 2, outer sleeves 3, and long bolts 4. The bushings 2 are hollow cylinders, and two sets of bushings 2 are mirror-symmetrically fitted onto the ends of the drive shaft 100 and the drive shaft 200. The sidewalls of the bushings 2 have slots 21 along the axial direction. The outer diameters of the two sets of bushings 2 gradually increase towards each other. Two sets of outer sleeves 3 are fitted onto the two sets of bushings 2 in a one-to-one correspondence. Bottom holes 22 are provided at opposite ends of the two sets of bushings 2. Several tie rods 1 are interference-fitted into the bottom holes 22 of the two sets of bushings 2 at both ends. Flanges 31 are provided on the outer sleeves 3, and several long bolts 4 are used to connect the flanges 31 of the two sets of outer sleeves 3. Specifically, the high-speed tie rod coupling connects the drive shaft 100 and the drive shaft 200, allowing torque to be transmitted from one shaft to another. Power transmission and dynamic compensation functions are achieved through the synergistic action of the tie rods 1, bushings 2, outer sleeves 3, and long bolts 4. The two bushings 2 are connected by four tie rods 1. The two ends of the tie rods 1 are connected to the bushings 2 on the drive shaft 200 and the transmission shaft 100, respectively. The four tie rods 1 are symmetrically distributed, and the cylindrical extensions at both ends are surface-hardened and tightly fitted with the bottom holes 22 of the bushings 2 via interference fit, ensuring both axial positioning accuracy and stress dispersion. The sidewalls of the bushings 2 are designed with slots 21, allowing elastic deformation under high-speed rotation or dynamic loads, thereby compensating for axial runout and radial movement. This structure absorbs impact loads and vibration energy during transmission, achieving dynamic stress release, reducing vibration transmission from the coupling to the shaft, and improving the fatigue life of the coupling. Both the transmission shaft 100 and the drive shaft 200 are assembled with the bushings 2 via interference fit. During assembly, the interference between the shaft and the bushing 2 generates radial compressive stress, forming strong friction, which can withstand high torque, axial tension, and combined loads, eliminating relative movement between parts, ensuring transmission accuracy, preventing loosening under dynamic loads, and providing more stable performance over long-term use. Each bushing 2 is fitted with an outer sleeve 3, which is interference-fitted with the bushing 2 to limit the runout of the bushing 2. The two outer sleeves 3 are connected by six sets of long bolts 4. The preload of the long bolts 4 and nuts keeps the spacing of the outer sleeves 3 fixed, thereby limiting the axial movement of the bushing 2. The threaded holes and smooth through holes on the flange 31 are tightened in stages to ensure uniform distribution of clamping force and avoid local stress concentration. The radial compressive stress generated by the interference fit creates a frictional self-locking effect, which can withstand high torque and combined loads. The slot 21 of the bushing 2 and the constraint system of the outer sleeve 3 work together to enable the coupling to absorb vibration at high speeds, reduce the vibration amplitude of the shaft, and extend its service life.

[0017] Specifically, there are four tie rods 1 and six long bolts 4.

[0018] like Figure 2As shown, the slots 21 on a set of bushings 2 are bidirectional and staggered. When the equipment is subjected to thermal expansion or impact load, the slots 21 can provide axial compensation and realize dynamic stress release.

[0019] like Figure 2 As shown, the root of the slot 21 is arc-shaped, which can be used to reduce stress distribution.

[0020] like Figure 2 , 3 As shown, the pull rod 1 adopts an arc shape. The main curved surface of the pull rod 1 is formed by precision machining to create a naturally transitioning arc contour. The diameters at both ends are larger than the diameter in the middle. When rotating at high speed, the shape with a small diameter in the middle and a large diameter at both ends can effectively reduce the centrifugal stress concentration phenomenon generated during high-speed rotation.

[0021] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A high speed pull rod coupling characterized by: The assembly includes tie rods, bushings, outer sleeves, and long bolts. The bushings are hollow cylinders, and two sets of bushings are mirror-symmetrically fitted onto the ends of the drive shaft and the drive shaft. The sidewalls of the bushings have slots along the axial direction. The outer diameters of the two sets of bushings gradually increase towards each other. The two sets of outer sleeves are fitted onto the two sets of bushings in a one-to-one correspondence. The opposite ends of the two sets of bushings have bottom holes. Several tie rods are interference-fitted into the bottom holes of the two sets of bushings at both ends. The outer sleeves are provided with flanges, and several long bolts are used to connect the flanges of the two sets of outer sleeves.

2. A high speed pull rod coupling as claimed in claim 1, wherein: The number of tie rods is four, and the number of long bolts is six.

3. A high speed pull rod coupling as claimed in claim 1, wherein: The slots on one set of bushings are bidirectional and staggered.

4. A high speed pull rod coupling as claimed in claim 3 wherein: The root of the groove is arc-shaped.

5. A high speed pull rod coupling as claimed in claim 1, wherein: The pull rod has an arc shape, with the diameters at both ends being larger than the diameter in the middle.

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