An elastic coupling without axial gap

Abstract

The utility model provides a kind of elastic coupling without axial gap, including integrally-formed main body, can reduce axial gap, and spiral groove is equipped on coupling, can guarantee torque while still can provide radial 360 ° of yaw compensation, wherein, shaft hole is equipped in the main body, two detachable connecting fixed blocks are equipped in the shaft hole, fixed block is equipped with cut slot along axial direction, fixed length memory alloy wire is jointly connected between the cut slot of two fixed blocks, the memory alloy wire is clamped on fixed block peripheral wall by fastener, so that the cut slot two sides are extruded to occlusion fixed, under the action of memory alloy wire, not only elastic deformation coupling main body can be corrected, make coupling main body both ends be in centring state, also greatly improve the service life of coupling main body, reduce replacement frequency, reduce cost, and then it can also improve the yield of production product, so that the use accuracy of the utility model is higher, more reliable.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical transmission technology, and specifically relates to an elastic coupling with no axial clearance. Background Technology

[0002] A flexible coupling is a mechanical transmission device that can compensate for relative displacement (axial, radial, and angular misalignment) between two shafts and absorb vibration and shock. It transmits torque through an elastic element while allowing for a certain degree of flexible deformation, making it suitable for applications requiring vibration reduction, noise reduction, or alignment compensation.

[0003] In the field of PCB tooling, PCB tools need to be processed according to the tooling process flow to meet the process requirements. During tooling, a common method is to connect the working head servo motor to the working head chuck via a coupling. However, the couplings used in existing technologies are generally universal joint couplings and diaphragm couplings. While these two types of couplings can compensate for concentricity deviations, they are prone to axial clearance, leading to tolerance errors in the length direction during tooling. This increases the defect rate of tooling, results in a short service life, and requires frequent replacement. Long-term use significantly increases the cost of replacing couplings, further impacting production capacity. Utility Model Content

[0004] (1) Technical problems to be solved This invention provides a flexible coupling with no axial clearance, aiming to solve the problem that existing couplings are prone to axial clearance, which affects service life and increases product defect rate.

[0005] (2) Technical solution This utility model provides an axially backlash-free flexible coupling, comprising an integrally formed body, a shaft hole inside the body, two detachably connected fixing blocks inside the shaft hole, a groove along the axial direction on each fixing block, and a shape memory alloy wire connected between the two fixing blocks. The body has a plurality of first bolt holes, through which fasteners pass and abut against the fixing blocks, causing the two sides of the groove to press against each other to engage and fix the shape memory alloy wire.

[0006] Furthermore, the shape memory alloy wire is coaxially arranged with the main body.

[0007] Furthermore, the groove is located at the center of the fixing block and has a crescent groove that is compatible with the shape memory alloy wire.

[0008] Furthermore, the total length of the two fixing blocks connected to the shape memory alloy wire is L1, and the length of the main body is L2, where L1 < L2.

[0009] Furthermore, the distance between the two end faces of the main body and the end faces of the adjacent fixing blocks is 6mm.

[0010] Furthermore, the main body is provided with a spiral groove in the middle, the length of which matches the effective working length of the shape memory alloy wire.

[0011] Furthermore, the main body is provided with second bolt holes at both ends. The second bolt holes are located outside the first bolt holes and are used to bolt the two shafts that need to be connected to the main body.

[0012] Furthermore, the second bolt holes are arranged in a ring array around the main body.

[0013] Furthermore, the second bolt hole is provided in a corresponding manner to the first bolt hole in the axial direction.

[0014] Furthermore, the edges at both ends of the shaft hole are chamfered.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The coupling body is integrally machined, which reduces axial clearance. The coupling also features a helical groove, ensuring torque while providing 360° radial runout compensation. Furthermore, the coupling body contains two fixing blocks with fixed-length shape memory alloy wires. This not only corrects elastic deformation of the coupling body, ensuring alignment at both ends, but also significantly extends its service life, reduces replacement frequency, lowers costs, and ultimately improves product yield. This makes the application of this invention more precise and reliable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0017] Figure 2 This is an exploded view of the overall structure of this utility model.

[0018] Figure 3 Cross-sectional view of the overall structure of this utility model Figure 1 .

[0019] Figure 4 This is a schematic diagram illustrating how the fixing block is fixed according to this utility model.

[0020] Figure 5 This is a schematic diagram of the assembly of the fixing block, fasteners, and shape memory alloy wire of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the fixing block and the shape memory alloy wire of this utility model.

[0022] Figure 7 Cross-sectional view of the overall structure of this utility model Figure 2 .

[0023] Figure 8 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0024] Reference numerals: 1-Main body, 11-Shaft hole, 111-Chamfer, 112-Mounting position, 12-First bolt hole, 13-Second bolt hole, 14-Helical groove, 2-Fixing block, 21-Slot, 211-Half-moon groove, 3-Memory alloy wire, 4-Fastener. Detailed Implementation

[0025] 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.

[0026] like Figure 1-4As shown, this utility model provides a flexible coupling with no axial clearance, including an integrally formed body 1. The body 1 is integrally machined to ensure the concentricity of the two shafts connected at both ends of the coupling. The body 1 has a shaft hole 11, and each end of the shaft hole 11 has a mounting position 112. The two mounting positions 112 are respectively used to install the output shaft of the driving component and the connecting shaft of the workpiece to be processed, so as to achieve high-precision transmission. Through the connection of the body 1, the relative displacement between the two shafts can be compensated, while absorbing vibration and impact and reducing noise. The shaft hole 11 is along the axial direction. Two identical and detachably connected fixing blocks 2 are provided in the shaft hole 11 through the main body 1. A shape memory alloy wire 3 is connected between the two fixing blocks 2. The shape memory alloy wire 3 is coaxially arranged with the main body 1. A groove 21 is provided on the side wall of the fixing block 2 along the axial direction. The groove 21 penetrates the center of the fixing block 2 longitudinally, making the fixing block 2 have a "C" shaped structure. The groove 21 provides space for deformation within the fixing block 2, making it more convenient to install the shape memory alloy wire 3 and enabling the use of shape memory alloy wires 3 with different diameters, thus improving the applicability. The main body 1 is also provided with a first bolt hole 12. A fastener 4 passes through the first bolt hole 12 and abuts against the fixing block 2, so that the two sides of the groove 21 are squeezed against each other to fix the shape memory alloy wire 3. There are at least two first bolt holes 12, and the installation direction of the fastener 4 in the two first bolt holes 12 is perpendicular to the opening direction of the groove 21. This allows the fixing blocks 2 separated by the groove 21 to move closer to each other. In this embodiment, the fastener 4 is a bolt. There are four first bolt holes 12. The four first bolt holes 12 are located on the symmetrical end faces of the main body 1, so that the bolts are screwed in radially from the four sides of the main body 1. The ends of the bolts are pressed against the four sides of the groove 21 to form a radial clamping force, which fixes the shape memory alloy wire 3 in the fixing block 2. This makes the force on the periphery of the fixing block 2 more balanced and the structure more stable. Compared with single-sided bolt fixing, double-sided bolt fixing can form a self-locking structure after tightening, and its anti-vibration and loosening ability is stronger.

[0027] Specifically, the shape memory alloy wire 3 is a fixed-length alloy wire with shape memory properties. Its length can be cut according to the length of the coupling to expand its application range and improve its utilization rate. The shape memory alloy wire 3 is made of nickel-titanium alloy, and its diameter can be determined according to the required spring force of the coupling. The diameter of the shape memory alloy wire 3 is directly proportional to the magnitude of the spring force. Due to the shape memory effect, superelasticity, and fixed length characteristics of the shape memory alloy wire 3, it will always remain straight under natural conditions. This ensures that the position of the fixing blocks 2 connected to both ends of the shape memory alloy wire 3 remains stable axially, eliminating axial clearance, improving the yield rate of product production, and reducing damage to the coupling, thereby lowering production costs.

[0028] It should be noted that this utility model uses a fixing block 2 with a groove 21 inside the main body 1 to fix the shape memory alloy wire 3 inside the fixing block 2. On the one hand, this can prevent the shape memory alloy wire 3 from being squeezed and deformed when fixed with bolts, thus affecting its stability. On the other hand, since the shape memory alloy wire 3 is relatively thin, if it is not wrapped and fixed inside the fixing block 2, it may shift during use, thus affecting its performance. Compared with traditional couplings, this utility model has a stronger elastic restoring force, which can not only compensate for the relative displacement between the two shafts, but also prevent the two shafts from shifting back and forth, ensuring no axial clearance.

[0029] Furthermore, such as Figure 5-6 As shown, the groove 21 is located at the center of the fixing block 2 and has a crescent groove 211 that is adapted to the shape memory alloy wire 3. The two crescent grooves 211 have a limiting effect on the shape memory alloy wire 3. At the same time, they can prevent the fastener 4 from squeezing the shape memory alloy wire 3 during fixing, so as to prevent it from deforming.

[0030] Furthermore, such as Figure 7 As shown, the total length of the two fixing blocks 2 connected to the shape memory alloy wire 3 is L1, and the length of the main body 1 is L2, where L1 < L2. This ensures that after the two fixing blocks 2 are installed in the shaft holes 11 within the main body 1, there is still a certain space at both ends, forming the two mounting positions 112. It should be noted that the two fixing blocks 2 and the shape memory alloy wire 3 are located at the center position within the main body 1, so that the two end faces of the main body 1 are equidistant from the end faces of the adjacent fixing blocks 2, i.e., the lengths of the two mounting positions 112 are the same. In this embodiment, the distance between the two end faces of the main body 1 and the end faces of the adjacent fixing blocks 2 is 6 mm.

[0031] Furthermore, such as Figure 8As shown, the main body 1 has a spiral groove 14 in the middle. Since the coupling is made of a lightweight aluminum material, and aluminum itself has a certain elasticity, combined with the function of the spiral groove 14, it can absorb the axial pressure between the two shafts during use, and also alleviate the angular and radial deviations between the two shafts, giving the coupling high precision and zero backlash. The length of the spiral groove 14 matches the effective working length of the shape memory alloy wire 3, so that the shape memory alloy wire 3 can make full use of the elastic space of the spiral groove 14 when deformed. When the two shafts connected by the main body 1 deviate, the spiral groove 14 undergoes elastic deformation, and the shape memory alloy wire 3 is stretched or compressed. If the shape memory alloy wire 3 is heated (such as by electric heating), it will return to its original length, pulling the spiral groove 14 to reset, thereby actively correcting the alignment of the two shafts.

[0032] Furthermore, the main body 1 is provided with second bolt holes 13 at both ends. The second bolt holes 13 are located outside the first bolt holes 12 and are used to fix the two shafts to be connected to the main body 1 using the fasteners 4, so that the position of the first bolt holes 12 corresponds to the position of the fixing block 2, and the positions of the second bolt holes 13 correspond to the positions of the two shafts to be connected to the main body 1. The second bolt holes 13 are arranged in a circular array around the main body 1, and there are four of them. When the two ends of the main body 1 are respectively connected to the two shafts, the bolts are screwed into the second bolt holes 13, so that the ends of the bolts surround and press against the peripheral walls of the two shafts, thereby fixing the two shafts in the main body 1, making the peripheral walls of the two shafts more evenly stressed and the structure more stable.

[0033] Preferably, the second bolt hole 13 is provided in a corresponding manner to the first bolt hole 12 in the axial direction, which makes the overall appearance of the main body 1 more beautiful and neat, and also makes it easier to process.

[0034] Furthermore, the edges at both ends of the shaft hole 11 are provided with chamfers 111, which have a guiding effect on the two shafts that need to be connected, making assembly more convenient.

[0035] The working principle of this utility model is explained in detail below: The two shafts that need to be connected are installed into the shaft holes 11 at both ends of the main body 1 and fixed with bolts through the second bolt holes 13. During use, if the two shafts deviate radially, the spiral groove 14 of the main body 1 can synchronously undergo slight deformation to compensate for the relative displacement between the two shafts. At this time, the shape memory alloy wire 3 is stretched, and due to the properties of the shape memory alloy wire 3 itself, the shape memory alloy wire 3 will automatically return to its original length, thereby pulling the spiral groove 14 to reset, thus actively correcting the alignment of the two shafts. At the same time, due to the fixed length of the shape memory alloy wire 3, it can prevent the two shafts from being stretched or compressed axially.

[0036] The innovation of this utility model lies in the fact that the coupling body is integrally machined, which reduces axial clearance. Furthermore, the coupling is equipped with a helical groove, which ensures torque while providing 360° radial runout compensation. Simultaneously, the coupling body contains two fixing blocks with fixed-length shape memory alloy wires. This not only corrects the coupling body after elastic deformation, ensuring the two ends of the coupling body are aligned, but also significantly extends the service life of the coupling body, reduces replacement frequency, lowers costs, and further improves the yield rate of manufactured products. This makes the utility model more accurate and reliable in use.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A flexible coupling with no axial clearance, characterized in that, The device includes an integrally formed main body (1), which has a shaft hole (11) inside. The shaft hole (11) has two detachably connected fixing blocks (2) inside. The fixing blocks (2) have grooves (21) along the axial direction. A memory alloy wire (3) is connected between the two fixing blocks (2). The main body (1) has several first bolt holes (12). Fasteners (4) pass through the first bolt holes (12) and abut against the fixing blocks (2), so that the two sides of the grooves (21) are squeezed against each other to fix the memory alloy wire (3).

2. The flexible coupling with no axial clearance according to claim 1, characterized in that, The shape memory alloy wire (3) is coaxially arranged with the main body (1).

3. The flexible coupling with no axial clearance according to claim 1, characterized in that, The groove (21) is located at the center of the fixing block (2) and has a crescent groove (211) that is compatible with the shape memory alloy wire (3).

4. The flexible coupling with no axial clearance according to claim 1, characterized in that, The total length of the two fixed blocks (2) connected to the memory alloy wire (3) is L1, and the length of the main body (1) is L2, where L1 < L2.

5. The flexible coupling with no axial clearance according to claim 4, characterized in that, The two ends of the main body (1) are 6mm apart from the ends of the adjacent fixing blocks (2).

6. The flexible coupling with no axial clearance according to claim 1, characterized in that, The main body (1) is also provided with a spiral groove (14) in the middle, and the length of the spiral groove (14) matches the effective working length of the memory alloy wire (3).

7. The flexible coupling with no axial clearance according to claim 1, characterized in that, The main body (1) is also provided with second bolt holes (13) at both ends. The second bolt holes (13) are located outside the first bolt holes (12) and are used to bolt the two shafts that need to be connected to the main body (1).

8. The flexible coupling with no axial clearance according to claim 7, characterized in that, The second bolt holes (13) are arranged in a ring array around the body (1).

9. The flexible coupling with no axial clearance according to claim 8, characterized in that, The second bolt hole (13) is provided in the axial direction corresponding to the first bolt hole (12).

10. The flexible coupling with no axial clearance according to claim 1, characterized in that, The edges at both ends of the shaft hole (11) are chamfered (111).

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