ISO 14691:2008 石油、石油化学、天然ガス産業—機械的動力伝達用のフレキシブルカップリング—汎用アプリケーション | ページ 6

3.1

angular misalignment

two minor angles between the extension of each machine shaft centre-line and the centre-line of the structure joining the two flexible elements

3.2

angular misalignment

minor angle between the extensions of the shaft centre-lines of the two coupled machines

3.3

axial displacement

change in the relative axial position of the adjacent shaft ends of two coupled machines, usually caused by thermal expansion

3.4

continuous torque rating

coupling manufacturer's declared maximum torque that the coupling can transmit continuously for the specified life

3.5

distance between shaft ends

DBSE

distance from the extreme end of one shaft (including any threaded end) to the extreme end of the next shaft or, in the case of integral flanges, the distance from the mating faces

3.6

double-engagement coupling

coupling with two planes of flexure

Note 1 to entry: This arrangement enables couplings of certain types, notably gear and metallic flexible-element types, that cannot normally accommodate parallel (or lateral) offset, to do so.

3.7

gear coupling

coupling of the mechanical contact type that transmits torque and accommodates misalignment and axial displacement by relative rocking and sliding motion between mating, profiled gear teeth

3.8

lateral offset

lateral distance between the centre-lines of two shafts that are not parallel, measured perpendicularly to the centre-line and in the plane of the shaft end of the driving machine

3.9

manufacturer

agency responsible for the design and fabrication of the coupling

Note 1 to entry: The manufacturer is not necessarily the vendor.

3.10

maximum allowable speed

maximum speed for which the manufacturer has designed the coupling

3.11

maximum allowable temperature

maximum continuous temperature for which the manufacturer has designed the coupling

3.12

maximum continuous angular misalignment

maximum angular misalignment at each plane of flexure that the coupling is able to tolerate for the specified life (5.1.3) when transmitting the coupling continuous torque rating at the coupling rated speed, and when simultaneously subjected to the coupling maximum continuous axial displacement

3.13

maximum continuous axial displacement

maximum axial displacement the coupling is able to tolerate for the specified life (5.1.3) when transmitting the coupling continuous torque rating at the coupling rated speed and when simultaneously subjected to the coupling maximum continuous angular misalignment

3.14

maximum continuous speed

highest rotational speed at which the coupling, as made and tested, is capable of continuous operation

3.15

mechanical contact coupling

coupling designed to transmit torque by direct mechanical contact between mating parts and accommodate misalignment and axial displacement by relative rocking and sliding motion between the parts in contact

Note 1 to entry: Examples of mechanical contact couplings are gear, grid, and pin-bushing couplings.

Note 2 to entry: The contacting parts can be metallic or can be made of self-lubricating non-metallic material.

Note 3 to entry: These couplings do not have a free-state position but resist change in the axial and angular direction, mainly as a function of transmitted torque and the coefficient of friction between the contacting parts.

3.16

metallic flexible-element coupling

coupling that obtains its flexibility from the flexing of thin metallic discs, diaphragms or links

3.17

momentary torque limit

maximum instantaneous torque that the coupling can tolerate without suffering immediate failure

3.18

owner

final recipient of the equipment who may delegate another agent as the purchaser of the equipment

3.19

parallel offset

distance between the centre-lines of two coupled shafts that are parallel but not in the same straight line

3.20

peak torque rating

maximum torque the coupling can tolerate for short periods

3.21

pilot

rabbet

register

spigot

surface that positions a coupling component, sub-assembly, or assembly radially with respect to another coupling component

3.22

potential unbalance

probable net unbalance of a complete coupling

Note 2 to entry: The concept of potential unbalance is explained more fully, and a worked example is provided, in Annex B.

3.23

purchaser

agency that issues the order and the specification to the vendor

Note 1 to entry: The purchaser can be the owner of the plant in which the equipment is being installed, the owner's appointed agent or, frequently, the manufacturer of the driven machine.

3.24

rated speed

highest rotational speed at which the coupling is required to be capable of transmitting the continuous torque rating while simultaneously subjected to the coupling rated axial displacement and the rated angular misalignment (or the rated parallel or lateral offset in the case of a single-engagement coupling)

3.25

residual unbalance

level of unbalance remaining in a component or assembly after it has been balanced, either to the limit of the capability of the balancing machine or in accordance with the relevant standard

3.26

service factor

factor applied to the steady-state torque in order to allow for off-design conditions, cyclic and other variations as well as equipment variations resulting in a torque higher than that at the equipment normal operating point

3.27

single-engagement coupling

coupling with only one plane of flexure

Note 1 to entry: This type of coupling can accommodate angular misalignment and axial displacement. Single-engagement couplings of some types, notably gear and metallic flexible-element types, do not normally accommodate parallel (or lateral) offset. Certain types of single-engagement couplings can accommodate offset misalignment to a limited extent.

3.28

spacer

part of a coupling that is removable to give access for maintenance and/or removal of the coupling hubs

Note 1 to entry: The spacer can be a single component or an assembly.

3.29

spacer gap length

distance between coupling hubs or sleeves in which the coupling spacer is installed

Note 1 to entry: Spacer gap length is not necessarily equal to the distance between the shaft ends.

3.30

torsional stiffness

rate of change of the angular deflection with respect to the applied torque about the axis of rotation

Note 1 to entry: With some types of couplings, the torsional stiffness is not constant but is a function of the magnitude of the torque and, with oscillating torques, also the frequency.

3.31

trip speed

rotational speed at which the independent emergency overspeed device operates to shut down a variable-speed prime mover or, for the purposes of this International Standard, in the case of alternating current electric motors, the speed corresponding to the synchronous speed of the motor at line frequency or, in the case of variable-frequency drives, at maximum supply frequency

3.32

unit responsibility

responsibility for co-ordinating the delivery and technical aspects of the equipment and all auxiliary systems included in the scope of the order

Note 1 to entry: The technical aspects for consideration include, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping, conformance to specifications and testing of components.

3.33

vendor

supplier

agency that supplies the equipment

Note 1 to entry: The vendor is the manufacturer of the equipment or the manufacturer's agent and normally is responsible for service support.