There are three components to be selected, two hubs and one elastomer. Calculate selection torque sf x application torque. The coupling has to be dimensioned in a way that the permissible coupling load is not exceeded with any operating condition. Select a coupling size equal to or greater than the design torque. According to standard, use the following methods to select ciwx, ciwy and ciwz series cardan shaft. Designers in choosing a shaft coupling, the first should be already set for the national standards, mechanical industry standards, and won the national patent in the coupling of choice, only in the existing standard coupling and patent coupling coupling cant meet. Universal joint shaft are selected according to the load features, calculated torques, bearing life and operating speed. The slenderness ratio of the shaft is small ld shaft. Electronic and electrooptical shaft alignment systems. The slightest misalignment results in considerable extra stress on shaft couplings.
Select a coupling to connect a 55 kw, 1500 rpm electric motor driving a lobetype blower. Reliance engineers have many years of experience working with and specifying shaft couplings. Angular misalignment occurs when shaft axis are inclined to one another. Selecting couplings for large loads machine design. Including couplings which compensate for misalignment is part of the design process and in some cases intentional shaft misalignment will be part of the design.
Industrial experts rely on martin for three simple reasons. A coupling can be simply defined as a device that transmits power torque from one shaft to another, while allowing some. Other factors that might be unique to the system, like dynamic balance of the coupling. Selection a service factor determine the required service factor from table below. Size check select a gear coupling to connect a 500 hp, 1170 rpm electric motor to a drive high speed shaft of a maneuvering winch. A shaft coupling is a mechanical device used to connect rotating shafts and absorb misalignments between them. Shaft couplings are available in different sizes and material finishes. Twin shaft coupling a semifloating shaft coupling is combined with a floating shaft coupling to make the twin shaft coupling, which is. Disc coupling selection guide send to lovejoy application engineering fax. Select a challenge tyre coupling to drive a reciprocating pump from a 980 revmin, 30 kw. Determine the required service factor from table below. Type s couplings are offered with epdm, neoprene, or hytrel sleeves. Selecting a coupling for a servo application can be a complex process.
Flexible shaft couplings permitted this change to direct shaft connection, and the gear coupling played an important role in this transition. Mpseries lowinertia servo motor with 100 mm to 165 mm frame size using shaft seals an additional seal is required on the motor shaft near the motor front bearing if the shaft is exposed to fluids or. St4 10 with gear coupling t kn 16,000 nm t an 9,550 9,744 nm 100 kw 980 min. Flexible couplings grid couplings pin and bush couplings. Coupling size must be large enough to accommodate both shafts. Select a coupling for reversing service to connect a gear drive lowspeed shaft to a runout mill table roll. Prerequisite to the selection of flexible shafts is a knowledge of the operational requirements, i. When this assumption is no longer true, questions can arise as to how the coupling should be sized.
It involves many different performance factors, including. Check dynamic balance chart for gear coupling on page 3 and page 23 for disc coupling to see if the coupling needs to be. Unsurprising ly, selecting the best coupling for a particular application can be a complicated matter. In order to find the length of the key to transmit full power of the shaft. Coupling selection guide introduction there is an extensive range of couplings available on the market today. Check shaft diameters against coupling maximum bore.
Disc coupling selection guide 11dec06 lovejoy, inc. Our engineers have developed a motor shaft coupling pdf white paper how to select shaft couplings to assist you in the selection of the most appropriate shaft to shaft or gearbox coupling for your application. When this assumption is no longer true, questions can arise as to how the coupling. When the shaft size of the driver and driven of the. Enter the desired shaft diameter, transmitted torque and. To help you improve rotating equipment performance, we have an extensive range of.
Selection of correct type and size of coupling is essential to realise a long service life. Dodge dflex couplings type sc coupling dynamically balanced to agma class 9 standards, the type sc spacer coupling accommodates a wide range of ansi and iso between shaft end distances. The coupling selection is based on operating factors. When the gear coupling was invented in 1918, industry was changing from steam to electric power and from belt to directdriven machinery. The shaft hubconnection has to be investigated by the customer. Selecting the best coupling type for an application can have a positive impact on pump, driver, andor coupling reliability and maintenance costs. Select from our standard options or contact us to discuss custom or modified shaft couplings. A fenaflex coupling is required to transmit 45kw from an a. Loading by rated torque for drives with small mass moments on the load side hydrostatic drives the selection.
Coupling between an electric motor pkw and n980 rpm and a gearbox driving a screw conveyor s a 1. Coupling selection 2 there are four basic functions which a shaft flexible coupling may be required to accommodate, and selection of a coupling should be made considering these. The dodge coupling product line can offer a solution to almost any customer need. Coupling selection guide 11 selections 12 15 taper bushes 16 spiderflex 17 19 spider 20 pinflex 21 25 crownpin 26 28 tyreflex 29 32 discflex 33 35 chainflex 36 37 rigid 38 gearflex 39 47 hydrastart 49 61 electric motor shaft dimensions 55 renold hitec coupling. Clifford matthews bsc hons, ceng, mba, in case studies in engineering design, 1998. Shaft end types cylindrical straight with key w key height keyway height shaft keyway height hub coupling selection. Shaft coupling casted materials 30 shaft coupling material steel 31 shaft coupling with taper clamping bush 32 clamping ring hubs 33 clamping hubs 34 flange programme types afn and bfn 35 dropout center design coupling.
Threaded lineshaft coupling threaded lineshaft coupling. It features a dropout center assembly for easy equipment maintenance. Fenaflex couplings can accommodate simultaneous maximum misalignment in all planes without imposing undue loads on adjacent bearings and the excellent shockabsorbing. Couplings selection transmission mechanics fatigue. Slipfree shaft couplings employed in centrifugal pumps are divided into rigid and flexible shaft couplings. Selection of cardan shaft universal joint shaft, cardan.
Renewable shaft sleeve or hard facing of shaft available for longer life. Shaft couplings, collars, and universal joints are parts that connect equipment to transmit power and help protect against shock, vibration, misalignment, backlash, and overload. The electric motor rating is 50 hp at the base speed and the system peak torque at the coupling is estimated to be 150,000 lbin. Tb woods 440 north fifth avenue chambersburg, pa 17201 usa toll free. The art of choosing the right shaft coupling leine linde. Rigid shaft coupling rigid shaft couplings are mainly used to connect perfectly aligned shafts.
Radial andor axial loads that are transmitted to the pump andor motor bearings through the coupling will reduce the life of these bearings. Goulds vertical turbine pumps 5 flanged column open lineshaft bearing flanged column product lubricated lineshaft is recommended for ease of maintenance. Home newsposts shaft coupling selection process 1, choose standard coupling. A practical guide to shaft alignment plant services. For the lowspeed shaft, the order of coupling cost, low to high, is gear, grid. Designing your power transmission system, and keeping it running smoothly and profitably, is a complex challenge. Outside forces acting on the coupling and its own performance limitations must be taken into consideration in making a selection. Which kind of coupling is installed on the shafts being connected will depend on the application. Coupling torque speed ofbores torsionally torsionally backlash. End float the ability to accommodate axial displacement of shafts. Martinflex couplings provide all the desirable features of an ideal flexible coupling, including taper bush fixing. Dodge has manufactured couplings for over 100 years, earning a reputation for developing innovative products that lower customers total cost of ownership. The electric motor rating is 50 hp at the base speed and the system peak torque at the coupling. In this case, the shaft of the coupling is supported with a single bearing, arranged as closely as possible to the outer sprocket or pulley.
Keyed double wide shaft collars are found in positive drive applications to prevent slippage on the shaft. The shaft coupling is the connecting element between the electric motor and the pump hydraulic system. This gives the design power which is used as a basis for selecting the coupling. Fenner shaft couplings range from highly resilient to. With the addition of a spacer assembly the coupling can be used to accommodate standard distances between shaft ends, dbse facilitating centrifugal pump maintenance. Flexible shaft couplings precision couplings reliance. Couplings are mechanical elements that couples two drive elements which enables motion to be transferred from one element to another. Please consult use for selecting other product series. Application details for service factor horsepower and rpm of the driver shaft details of the driving and driven equipment selection. Coupling sele ction a cc ording to din 740 part ii for continuously updated data please refer to our online catalogue at. Mpseries lowinertia servo motor with 100 mm to 165 mm.
By far the most widely used lubricated coupling is the gear coupling. The motor shaft is 60mm diameter and the screen shaft is 55mm diameter. They are commonly used as a standard shaft collar for guiding, stopping, spacing and component alignment or short rigid coupling. Like a pulse encoder, a shaft coupling is a component that must be handled carefully by. Select flexible shafts using the tables and power transmission chart.
A larger coupling size can be selected as a way to avoid a dangerous rpm range. Shaftcouplings ho w to select your flexible shaft couplings. Misalignment shaft couplings misalignment shaft couplers. Shaft couplings how to select your flexible shaft couplings.
Flange couplings cone clamping couplings gear couplings disc couplings. Coupling selection method terminology for couplingsassembly. Selection parameters for skf shaft couplings the following table shows typical character istics for various coupling types. For example, a machine running at 1800 rpm with 12 inch of spacer shaft length would allow a maximum offset of. Verify the coupling selected has bore capacity greater than or equal to the required bore or shaft. The coupling has to be dimensioned such that the permissible coupling load is not exceeded during any operating condition. This paper seeks to answer some of these questions by examining how vfds work and what. Selection is replacing a geartype coupling with a 3 mm gap.
How to quickly calculate coupling sizing torque given how frequently coupling users and application engineers are required to calculate coupling sizing torque, lovejoy built a free coupling. A range of highly flexible couplings offering excellent misalignment capacity and. This article describes what is a coupling, types of couplings, rigid couplings, flexible couplings, universal couplings, hookes coupling, pin bush coupling, flanged coupling etc. As coupling diameter increases, rated peak torque also increases, as does radial misalignment accomodation. Verify the coupling selected has bore capacity greater than or equal to the required bore or shaft size.
Reliance engineers have many years experience working with and specifying shaft couplings and are very happy to offer applications advice on coupling selection. Quality power transmission and material handling solutions. Coupling selection for a cdwdrives coupling is quick and simple. In other words, a square key is equally strong in shearing and crushing. Flexible couplings are devices used to me chanically. Motor shaft diameter is 60 mm, blower shaft diameter is 60 mm. Check that the shaft end separation dbse is acceptable for the design chosen. Coupling maximum limits should not be used simultaneously.
Shaft couplings, collars, and universal joints power. Coupling torque speed ofbores torsionally torsionally backlash type rangenm capacity mm soft rigid free universaljoints 10to580 lowtomedium 6to50 4 oldham 0. For spacer shafts the table gives the maximum allowable offset for 1. Selection process jaw type coupling selection process the selection process for determining the proper jaw coupling size and elastomer requires using the charts shown on the following pages. Application details for service factor horsepower and rpm of the driver shaft details of the driving and driven equipment selection procedure. A beam coupling, also known as helical coupling, is a flexible coupling for transmitting torque between two shafts while allowing for angular misalignment, parallel offset and even axial motion, of one shaft. Use a large hub or use a larger coupling if necessary. Verify the coupling selected has a torque rating greater than or equal to the selection torque. Jaw couplings, sleeve couplings, and tire couplings do not require lubrication and are commonly used on electric motor applications, such as gearboxes, conveyors, and.
To be used in determining which coupling type or style may be best suited for an application. Follow the guide below to find the proper coupling for your application, or contact us to have a cdwdrives engineer perform the selection. If bore is inadequate, consider the use of a reduced key from engineering tables, or select a larger size. Precision couplings a complete range of flexible shaft couplings. Instructions and contact info duraflex coupling details. Shaftcouplings ho w to select your flexible shaft couplings sizecalculation hp n. Semifloating shaft couplings a reference for the usage of these couplings is shown in the left illustraion. Service factors and selection keyway and keyway dimensions 14 taper bushes 15. Lovejoys jaw type couplings are available in 24 sizes from a minimum torque rating of 3. With coupling selection, pump users should beware the trap that more is better. In selecting shaft misalignment couplings when designing a system, there are essential points to consider in choosing the correct coupling. Bore selection is typically driven by the shafts involved. Coupling shafts are usually stepped so that larger diameter bearings can be used on the main body of the shaft.
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