German Settima coupling Settima model Settima price

Settima coupling is a widely used coupling, also known as a jaw coupling, consisting of two metal jaw discs and an elastomer. The two metal jaw discs are generally made of 45 steel, but aluminum alloy is also used when load sensitivity is required.

Settima coupling structure

It consists of two shaft hubs and a center slider. The center slider, acting as a torque transmission element, is usually made of engineering plastic; in special cases, other materials such as metals can be selected. The center slider connects to the shaft hubs on both sides through slots distributed at 90° relative positions, thereby achieving torque transmission. A slight pressure fit between the center slider and the shaft hubs ensures zero-backlash operation during equipment runtime. With prolonged use, the slider may lose its backlash-free function due to wear, but the center slider is inexpensive and easy to replace, restoring original performance after replacement. Slider couplings are commonly used with general-purpose motors and, in specific instances, to connect servo motors, correcting relative displacement through the sliding of the center slider. Since the half-coupling and the intermediate disc form a sliding pair and cannot rotate relative to each other, the angular velocity of the driving shaft must equal that of the driven shaft. However, when operating with relative displacement between the two shafts, the intermediate disc generates significant centrifugal force, increasing dynamic loads and wear. Therefore, care must be taken during selection to ensure the operating speed does not exceed the specified value. This type of coupling is generally used for speeds n<250r/min, where shaft stiffness is high and there are no severe impacts.

Settima coupling features

The material for slider coupling parts can be 45 steel, with heat treatment required on working surfaces to increase hardness; for lower requirements, Q275 steel can be used without heat treatment. To reduce friction and wear, lubrication should be applied through the oil hole in the intermediate disc during use. Since the half-coupling and the intermediate disc form a sliding pair and cannot rotate relative to each other, the angular velocity of the driving shaft must equal that of the driven shaft. However, when operating with relative displacement between the two shafts, the intermediate disc generates significant centrifugal force, increasing dynamic loads and wear. Therefore, care must be taken during selection to ensure the operating speed does not exceed the specified value. This type of coupling is generally used for speeds n<250r/min, where shaft stiffness is high and there are no severe impacts. A slight pressure fit between the center slider and the shaft hubs ensures zero-backlash operation during equipment runtime. With prolonged use, the slider may lose its backlash-free function due to wear, but the center slider is inexpensive and easy to replace, restoring original performance after replacement. Slider couplings are commonly used with general-purpose motors and, in specific instances, to connect servo motors, correcting relative displacement through the sliding of the center slider. Since resistance to relative displacement comes from the friction between the slider and the shaft hubs, the bearing load does not increase with greater relative displacement. Slider couplings can eliminate additional loads between shafts during motor automatic control processes; the fixed body uses internal splines for sliding, while the sliding body's inner and outer sleeves can slide relatively in the axial direction; this coupling integrates sliding and rotation; for equivalent rotational diameters, its shortest dimension is far smaller than that of a cross-axis. It improves the uniformity of load distribution on the working surface, enabling transmission of higher torque, though elasticity is slightly reduced.

Settima coupling applications

Unlike other couplings, the slider coupling lacks elastic elements that function like springs, so bearing loads do not increase with greater relative displacement between shafts. Regardless, this series of couplings offers good value for money, with the ability to select sliders of different materials being its greatest advantage. Juren Company can provide a variety of raw material options for center sliders to suit different applications based on specific customer requirements. Generally, one type of material is suitable for zero-backlash, high-torque rigidity, and high-torque conditions, while another type is suitable for low-precision positioning, where zero-backlash is not required, but vibration absorption and noise reduction functions are needed. Non-metallic sliders also provide excellent electrical insulation and can serve as mechanical fuses. When the engineering plastic slider is damaged, torque transmission is completely terminated, thereby protecting expensive mechanical components. This design is suitable for large parallel relative displacements. The three-part design of the slider coupling limits its ability to compensate for axial deviations, meaning it cannot be used in push-pull applications. Additionally, since the center slider is floating, the motion of the two shafts must ensure the slider does not disengage.

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