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REXS V1.7

Couplings

Couplings and coupling points indicate the connection of two components, with a single position and stiffness. They correspond to a concept_bearing with additional torsional stiffness (and thus transmit torque and speed). A coupling point (coupling) is an abstract representation of a non-switchable coupling or a  shaft-hub connection (e.g., press fit, key, spline). The abstract switchable_coupling component can be used to represent switchable gears and switching states.

The concrete modeling of different real coupling types will be defined in a later version of the specification.

As with bearings, couplings are connected with two components using a side relation. The "inner_part" role corresponds to the component that is attached to the inner side of the coupling. Similarly, the "outer_part" role corresponds to the component that is attached to the outer side of the coupling. If the inner and outer sides are not specifically identified, the "inner_part" and "outer_part" roles can be defined arbitrarily; for example, inner_part = left for axial connections.

A special "coupling" relation was used in version 1.0. This has been removed.

Required components

XML syntax

coupling

<componentid="12"type="coupling"> ... </component>

switchable_coupling

<component id="5" type="switchable_coupling"> ... </component>

Two of the following component types are required, depending on the components that are connected by the coupling:

Optional components

XML syntax

Shaft

<component id="3" type="shaft"> ... </component>

Casing

<component id="2" type="gear_casing"> ... </component>

Side plate (only for couplings)

<componentid="10"type="side_plate"> ... </component>

Exactly one of the following relations is required, depending on the components that are connected by the coupling:

Required relations

XML syntax

side relation

for a shaft-shaft coupling

<relation id="2" type="side">
	<ref id="5" role="assembly" hint="switchable_coupling"/>
	<ref id="3" role="inner_part" hint="shaft"/>
	<ref id="4" role="outer_part" hint="shaft"/>
</relation>

side relation

for a shaft-casing coupling

<relation id="2" type="side">
	<ref id="5" role="assembly" hint="switchable_coupling"/>
	<ref id="3" role="inner_part" hint="shaft"/>
	<ref id="2" role="outer_part" hint="gear_casing"/>
</relation>

side relation

for a casing-shaft coupling

<relation id="2" type="side">
	<ref id="5" role="assembly" hint="switchable_coupling"/>
	<ref id="2" role="inner_part" hint="gear_casing"/>
	<ref id="3" role="outer_part" hint="shaft"/>
</relation>

side relation

for a rim-side plate or pin-side plate coupling

<relationid="17"type="side">
    <ref id="12" role="assembly" hint="coupling"/>
    <ref id="8" role="inner_part" hint="shaft"/>
    <ref id="10" role="outer_part" hint="side_plate"/>
</relation>

side relation

for a casing-casing coupling

<relationid="20"type="side">
    <ref id="12" role="assembly" hint="coupling"/>
    <ref id="2" role="inner_part" hint="gear_casing"/>
    <ref id="3" role="outer_part" hint="gear_casing"/>
</relation>
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