Torx coupling and star coupling are not the same.
The coupling with elastic spider spacer has multiple blade branches, and like the slider coupling, it also matches the plum blossom elastic spacer with the shaft sleeves on both sides by pressing, thus ensuring its zero clearance performance. Different from the slider coupling, the plum blossom coupling is driven by squeezing, while the slider coupling is driven by shearing force. ?
the radial movement of the star-shaped elastic coupling due to the centrifugal force will accelerate its wear when it runs at high speed, and a shell is added. In addition to preventing dust and storing oil, insufficient thinning may cause interference, while excessive thinning will weaken the strength of teeth and lead to large backlash. The contact conditions of external teeth are improved, which avoids the disadvantages of edge extrusion and stress concentration at the end of straight teeth under angular displacement, improves the friction and wear of tooth surfaces, reduces noise and has a long maintenance cycle. The tooth end of the outer gear sleeve of the star-shaped elastic coupling is horn-shaped, so it is not suitable for high speed and impact load, nor for vertical shaft connection.
In fact, there are many similarities between the plum blossom coupling and the star coupling, but they still have different differences:
1. The most obvious difference lies in the difference of elastic pads between the star coupling and the plum blossom coupling. The elastic body of the quincunx coupling is a quincunx-shaped elastic pad with model MT1-13, specifications: height =12-55mm, outer diameter =48-391mm, inner diameter = 19-25 mm; The elastomer of the star-shaped coupling is a star-shaped elastic pad, the model is GR1-GR18, and the specification: the outer diameter is from 2 mm to 42 mm, and the inner diameter is from 1 to 22 mm.. Operating temperature: -4~1 C and torque: 22.4~25NM；;
2. Both materials are made of polyurethane. Polyurethane elastomer has good elasticity, cushioning effect, long service life and easy replacement. The common models of plum blossom coupling are ML type, MLL-II with brake wheel type, and the common models of star coupling are XL type and XLD type. The outer diameter of the axle hole of XLD is larger than that of XL, so under the same model, the XLD type star coupling bears more torque than XL, and the price is relatively more expensive.
3. Another obvious difference between the star coupling and the quincunx coupling is that there are four claws in the middle of the star coupling and three claws in the middle of the quincunx coupling. Under the same model, the torque that the star coupling can bear is larger than that of the quincunx coupling, so the star coupling can be made smaller.
4. On the two kinds of coupling installation equipment, it is difficult to tell whether it is a plum-blossom coupling or a star-shaped coupling only from the appearance, and it can only be judged by the shape of the elastic pad or the shape of the claw. It is easy to distinguish that the side of the claw of the star coupling is flat and the side of the claw of the plum coupling is arc-shaped. For more details, please pay attention to Botou Wansheng Coupling-a professional coupling research institute.
The shape of each corner of the two kinds of elastic bodies of plum-blossom coupling and star-shaped coupling is different. Relatively speaking, the contact area between the elastic body and the claw is large when the star-shaped coupling is assembled, that is, the stress area is large, and its performance is better than that of plum-blossom coupling.
pictures of plum blossom coupling and star coupling: