For example, a machine running at 1800 rpm with 12 inch of spacer shaft length would allow a maximum offset of. Bore selection is typically driven by the shafts involved. 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. When this assumption is no longer true, questions can arise as to how the coupling should be sized. Select a coupling to connect a 55 kw, 1500 rpm electric motor driving a lobetype blower. Select a coupling for reversing service to connect a gear drive lowspeed shaft to a runout mill table roll. Selecting couplings for large loads machine design. Coupling selection for a cdwdrives coupling is quick and simple.
Flexible couplings grid couplings pin and bush couplings. 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. 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 slenderness ratio of the shaft is small ld shaft. Shaftcouplings ho w to select your flexible shaft couplings. Selecting the best coupling type for an application can have a positive impact on pump, driver, andor coupling reliability and maintenance costs. In order to find the length of the key to transmit full power of the shaft. Precision couplings a complete range of flexible shaft couplings. A larger coupling size can be selected as a way to avoid a dangerous rpm range. Verify the coupling selected has bore capacity greater than or equal to the required bore or shaft size. The electric motor rating is 50 hp at the base speed and the system peak torque at the coupling. 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. To be used in determining which coupling type or style may be best suited for. End float the ability to accommodate axial displacement of shafts.
Selection a service factor determine the required service factor from table below. In other words, a square key is equally strong in shearing and crushing. Shaft couplings, collars, and universal joints are parts that connect equipment to transmit power and help protect against shock, vibration, misalignment, backlash, and overload. Designing your power transmission system, and keeping it running smoothly and profitably, is a complex challenge. Disc coupling selection guide 11dec06 lovejoy, inc. To help you improve rotating equipment performance, we have an extensive range of. A coupling can be simply defined as a device that transmits power torque from one shaft to another, while allowing some. Flexible couplings are devices used to me chanically. According to standard, use the following methods to select ciwx, ciwy and ciwz series cardan shaft. This article describes what is a coupling, types of couplings, rigid couplings, flexible couplings, universal couplings, hookes coupling, pin bush coupling, flanged coupling etc. Fenaflex couplings can accommodate simultaneous maximum misalignment in all planes without imposing undue loads on adjacent bearings and the excellent shockabsorbing. It features a dropout center assembly for easy equipment maintenance.
When the shaft size of the driver and driven of the. Shaft couplings how to select your flexible shaft couplings. Shaft couplings are available in different sizes and material finishes. 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. As coupling diameter increases, rated peak torque also increases, as does radial misalignment accomodation. A fenaflex coupling is required to transmit 45kw from an a. When the gear coupling was invented in 1918, industry was changing from steam to electric power and from belt to directdriven machinery. 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. 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. Check that coupling selected will accept the required shaft diameters. 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.
Reliance engineers have many years of experience working with and specifying shaft couplings. A practical guide to shaft alignment plant services. The shaft coupling is the connecting element between the electric motor and the pump hydraulic system. Twin shaft coupling a semifloating shaft coupling is combined with a floating shaft coupling to make the twin shaft coupling, which is.
Check dynamic balance chart for gear coupling on page 3 and page 23 for disc coupling to see if the coupling needs to be. Select a coupling size equal to or greater than the design torque. The motor shaft is 60mm diameter and the screen shaft is 55mm diameter. A shaft coupling is a mechanical device used to connect rotating shafts and absorb misalignments between them. Renewable shaft sleeve or hard facing of shaft available for longer life. Selection of cardan shaft universal joint shaft, cardan. Goulds vertical turbine pumps 5 flanged column open lineshaft bearing flanged column product lubricated lineshaft is recommended for ease of maintenance. In selecting shaft misalignment couplings when designing a system, there are essential points to consider in choosing the correct coupling. Flange couplings cone clamping couplings gear couplings disc couplings. Coupling selection typically assumes that the attached electric motor is running at 1800 rpm at the nameplate horsepower. The art of choosing the right shaft coupling leine linde.
Tb woods 440 north fifth avenue chambersburg, pa 17201 usa toll free. Calculate selection torque sf x application torque. Coupling selection method terminology for couplingsassembly. Check shaft diameters against coupling maximum bore. Couplings are mechanical elements that couples two drive elements which enables motion to be transferred from one element to another. Which kind of coupling is installed on the shafts being connected will depend on the application. There are three components to be selected, two hubs and one elastomer. For spacer shafts the table gives the maximum allowable offset for 1. Unsurprising ly, selecting the best coupling for a particular application can be a complicated matter. If bore is inadequate, consider the use of a reduced key from engineering tables, or select a larger size. For the lowspeed shaft, the order of coupling cost, low to high, is gear, grid. It involves many different performance factors, including. Coupling torque speed ofbores torsionally torsionally backlash type rangenm capacity mm soft rigid free universaljoints 10to580 lowtomedium 6to50 4 oldham 0.
Fenner shaft couplings range from highly resilient to. 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. Coupling between an electric motor pkw and n980 rpm and a gearbox driving a screw conveyor s a 1. Please consult use for selecting other product series. Disc coupling selection guide send to lovejoy application engineering fax. Flexible shaft couplings precision couplings reliance. Industrial experts rely on martin for three simple reasons.
Prerequisite to the selection of flexible shafts is a knowledge of the operational requirements, i. Universal joint shaft are selected according to the load features, calculated torques, bearing life and operating speed. Outside forces acting on the coupling and its own performance limitations must be taken into consideration in making a selection. Shaft end types cylindrical straight with key w key height keyway height shaft keyway height hub coupling selection.
Select from our standard options or contact us to discuss custom or modified shaft couplings. Like a pulse encoder, a shaft coupling is a component that must be handled carefully by. Keyed double wide shaft collars are found in positive drive applications to prevent slippage on the shaft. Rigid shaft coupling rigid shaft couplings are mainly used to connect perfectly aligned shafts. Loading by rated torque for drives with small mass moments on the load side hydrostatic drives the selection. Motor shaft diameter is 60 mm, blower shaft diameter is 60 mm. Threaded lineshaft coupling threaded lineshaft coupling. To be used in determining which coupling type or style may be best suited for an application. Type s couplings are offered with epdm, neoprene, or hytrel sleeves. Application details for service factor horsepower and rpm of the driver shaft details of the driving and driven equipment selection procedure. With the addition of a spacer assembly the coupling can be used to accommodate standard distances between shaft ends, dbse facilitating centrifugal pump maintenance. Electronic and electrooptical shaft alignment systems. Follow the guide below to find the proper coupling for your application, or contact us to have a cdwdrives engineer perform the selection. Martinflex couplings provide all the desirable features of an ideal flexible coupling, including taper bush fixing.
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. Flexible shaft couplings permitted this change to direct shaft connection, and the gear coupling played an important role in this transition. Selecting a coupling for a servo application can be a complex process. The coupling has to be dimensioned such that the permissible coupling load is not exceeded during any operating condition.
Quality power transmission and material handling solutions. Selection of correct type and size of coupling is essential to realise a long service life. Angular misalignment occurs when shaft axis are inclined to one another. Selection is replacing a geartype coupling with a 3 mm gap. The renold collection 06 coupling comparison chart 08.
Whether the need is an elastomeric or metallic design, dodge can provide a coupling with the potential to increase torque capacity, accommodate shaft misalignment, extend life, and put an end to unexpected downtime. A range of highly flexible couplings offering excellent misalignment capacity and. 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 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. Enter the desired shaft diameter, transmitted torque and.
The coupling has to be dimensioned in a way that the permissible coupling load is not exceeded with any operating condition. Radial andor axial loads that are transmitted to the pump andor motor bearings through the coupling will reduce the life of these bearings. Oversizing a coupling can result in a reduction in needed flexibility or misalignment compensation, and a coupling that is too large can put additional stresses on the pumps and motors being coupled. Coupling maximum limits should not be used simultaneously. The shaft hubconnection has to be investigated by the customer. Service factors and selection keyway and keyway dimensions 14 taper bushes 15. St4 10 with gear coupling t kn 16,000 nm t an 9,550 9,744 nm 100 kw 980 min. Therefore, careful shaft coupling selection is important as differing configurations of coupling are designed to perform very differently dependent upon the application, and, as a consequence, have very different benefits and drawbacks. Home newsposts shaft coupling selection process 1, choose standard coupling. Instructions and contact info duraflex coupling details. Misalignment shaft couplings misalignment shaft couplers.
Other factors that might be unique to the system, like dynamic balance of the coupling. This paper seeks to answer some of these questions by examining how vfds work and what. 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. Shaftcouplings ho w to select your flexible shaft couplings sizecalculation hp n. Coupling torque speed ofbores torsionally torsionally backlash. For this purpose the actual loads have to be compared to the permissible parameters of the coupling. When this assumption is no longer true, questions can arise as to how the coupling. Determine the required service factor from table below. Semifloating shaft couplings a reference for the usage of these couplings is shown in the left illustraion.
They are commonly used as a standard shaft collar for guiding, stopping, spacing and component alignment or short rigid coupling. The slightest misalignment results in considerable extra stress on shaft couplings. Application details for service factor horsepower and rpm of the driver shaft details of the driving and driven equipment selection. Slipfree shaft couplings employed in centrifugal pumps are divided into rigid and flexible shaft couplings. Dodge has manufactured couplings for over 100 years, earning a reputation for developing innovative products that lower customers total cost of ownership. Verify the coupling selected has a torque rating greater than or equal to the selection torque. The dodge coupling product line can offer a solution to almost any customer need. Select a challenge tyre coupling to drive a reciprocating pump from a 980 revmin, 30 kw. This gives the design power which is used as a basis for selecting the coupling. Verify the coupling selected has bore capacity greater than or equal to the required bore or shaft. Coupling shafts are usually stepped so that larger diameter bearings can be used on the main body of the shaft. Use a large hub or use a larger coupling if necessary.
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. Reliance engineers have many years experience working with and specifying shaft couplings and are very happy to offer applications advice on coupling selection. Check that the shaft end separation dbse is acceptable for the design chosen. Select flexible shafts using the tables and power transmission chart. Couplings selection transmission mechanics fatigue. The coupling selection is based on operating factors. Mpseries lowinertia servo motor with 100 mm to 165 mm. Clifford matthews bsc hons, ceng, mba, in case studies in engineering design, 1998. Selection parameters for skf shaft couplings the following table shows typical character istics for various coupling types. Coupling selection guide introduction there is an extensive range of couplings available on the market today. Shaft couplings, collars, and universal joints power. Coupling sele ction a cc ording to din 740 part ii for continuously updated data please refer to our online catalogue at.