This section provides additional technical specifications on DIN /1 keyways to learn more about the components in the Elesa Catalogue. DIN Technical Specifications. DIN DIN Parallel key – product drawing – d1=length,. b h9, 3, 4, 5, 6, 8, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 32, 36 . Page | Screws and Nuts, Washers, Lifting accessories. 1. 2. 3 b h9 h. Length l Keys DIN are only in packing units of 50 pieces for each size and length available. see also • Keyway type in the bore and the shaft → Page
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A parallel key is a positive shaft-hub-connection. The torque is transmitted from the shaft to the hub via the parallel key. The main purpose of the parallel key is to transmit static and quasi-static torques.
The parallel key can be used with limitations dib for swelling and alternating torques.
DIN /1 keyways | Elesa
In case a good assembly and disassembly of the shaft-hub-connection are required or necessary e. A shearing off of the parallel key does not happen very often and occurs only in the event of overloading.
General Overview For the proof of strength of parallel keys, it is necessary to check the following factors: Surface pressure on the shaft, parallel key and hub Design strength of the shaft for Torsional stress, normally quasi- static Bending load, normally dynamic Consideration of notch effects, for that the strength calculation for the shaft according to DIN is usually used Design strength of the hub In DIN a distinction is made between different methods for the proof of strength for parallel keys: Method B The dimensioning takes place due to a detailed consideration of the occurring surface pressures.
In addition, the proof of strength for the shaft is carried out according to the nominal stress concept. Method C It is a rough calculation of the surface pressure and resulting estimation of the shaft stress. The DIN standard specifies the following scope: For parallel keys whose parts are made of metallic materials Geometry and parallel key lengths according to DIN DIN has to be considered for the shaft strength, hub design and hub wall thickness must also be considered Mainly for parallel keys used in mechanical engineering for the temperature range of C to C This geometry selection includes the standard lengths of parallel keys.
The supporting length is determined from the standard length and the chosen parallel key type. There are various types of parallel keys – the types A to J are available. Parallel key types E to J The supporting length for the different types of parallel keys is calculated as follows: The following applies for round-ended parallel keys type A, E, C The following applies for straight-ended parallel keys type B, D, F, G, H, J This applies for combined parallel keys AB is the supporting length is the standard length is the width For nonstandard parallel keys, it is possible to define an individual parallel key geometry and supporting lengths.
The different keyway depths in shaft and hub as well as the chamfer of the parallel key are taken into consideration for the calculation. For method B, the chamfer on the shaft and hub keyway is additionally integrated into the calculation. If you choose to enter the supporting length manually, the supporting length of the hub keyway can be smaller than of the parallel key.
For this case, according to DINthe length of each extended part may be calculated as carrying up to maximum. For a safe calculation, the eAssistant software uses the most conservative case and this exceptional case will not be considered automatically.
The calculation can be run by using unusual metallic materials. The following strength criteria have to be fulfilled with the appropriate safeties: The load direction changing factor considers the influence of the number of load direction changes on the permissible surface pressure. The load peak frequency factor evaluates the influence of the load peaks on the maximum surface pressure.
The calculation method applies for one-sided stress and with restriction for an alternating stress of the parallel keys.
The surface pressure is determined from the torque that is transmitted. Geometry and surface pressure on the parallel key connection The supporting keyway depth between parallel key and shaft as well as hub keyway wall are given by the following equations. Therefore, a chamfer and radius on the parallel key as well as on the shaft and hub keyway edge are considered according to keywau figure above: For shaft keyway wall For hub keyway wall Steady load current generator, uniformly loaded conveyor belt or platform conveyor, worm conveyor, light lifts, packing machinery, feed drives for machine tools, ventilators, light-weight centrifuges, centrifugal pumps, agitators and mixers for keywwy liquids or uniform density materials, shears, presses, stamping machines, vertical gear, running gear Light Shocks: Rubber extruders, continuously operating mixers for rubber and plastics, ball mills lightwood-working machines gang saws, lathesbillet rolling mills, lifting gear, single cylinder piston pumps Heavy Shocks: Keyeay bucket wheel drivesbucket chain drives, sieve drives, power shovels, ball mills heavyrubber kneaders, crushers stone, orefoundry machines, dinn distribution pumps, rotary drills, brick presses, de-barking mills, peeling machines, cold strip c, e, briquette presses, breaker mills Thus, the reduced load capacity of the parallel key is considered by the load factor.
In practice, not more than two parallel keys are used keywy of the load distribution that is difficult to determine. Using these load parts, ductile materials with ekyway yield point as well as sufficient manufacturing accuracy are required. For brittle materials e. For using two keyawy keys, the unbalanced carrying is considered by the following assumption: The factor is dependent upon the kind of load in and output position.
Regardless of the torque flow direction, three cases are distinguished. Kind of load application For a stepped hub, it means see above figure: Small outer diameter of stepped hub Large outer diameter of stepped hub Distance between the axial 685 planes through N and W Width of the hub with within the carrying part of the parallel key, i. The alternative outer diameter is calculated as follows: Depending onthe factor is determined by using the figures 3, 4 and 5 in DIN These diagrams are integrated into the calculation module and are valid for a specific ratio.
For other ratiosthe values are determined from two diagrams by interpolation. The friction factor considers that. But it is taken into consideration only for the calculation of the maximum effective surface pressure. For a dynamic load, an interference fit stops the occurrence of fretting corrosion.
A clearance fit or interference fit adversely affects the 688 strength. For the determination of the friction factor, a minimum friction torque of the interference fit is assumed.
Feather keys DIN – Machine Elements | Elesa+Ganter
According to DINkeyawy can be obtained for a hole without keyway. The joint pressure, that is reduced due to the parallel key in comparison to dkn hole without keyway, is considered by the factor.
Thus, the friction torque, effective for the power transmission, is decreased. As a first approximation, can be specified for a parallel key. With the maximum load peak torqueoccurring during the entire operation time, it applies: For the load peak torque is transmitted by friction.
In this case, the surface pressure, occurring in the parallel key, is not relevant.
Parallel Keys – Type A, round-ended without retaining screw – Part 3
A check of the maximum surface pressure is not necessary according to DIN However, it is integrated into the calculation. Friction factor Kewyay note: However, the rating life is limited if it comes to constant slipping between shaft and hub and dun to a deflection of the parallel key connection. There are two different cases: One-sided load of the parallel key during alternating load direction.
The maximum torques in reverse direction against the main load direction do not exceed the effective part of the minimum friction torque. Alternating load of the parallel key during alternating load direction.
The maximum torques exceed the effective part of the minimum friction leyway in 685 directions. In case 2, the changes of load direction factor is dependent upon the frequency of changes of load direction for the parallel key. It can be determined according to DINfigure 6. Two cases ein distinguished: For alternating torques with a slow torque increase e. Special cases may occur due to starting impacts, short-circuit torques, emergency breaking torques, abrupt blockings etc. The frequency of the load peaks has to be estimated during the entire operating time.
For a single load peak, depending on the ductility of the material, the 1,3 to 1,5 times the permanent surface pressure is allowed. The progress of for ductile and brittle materials over the frequency is shown in figure 5 according to DIN Load peak frequency factor kryway From experience, the supporting effect for hubs is larger due to the higher stressed material volume than for shafts and parallel keys see table: By the hardness influence factor, an increasing of the permissible surface pressure is considered see table: The strength of the shaft is verified according to the nominal stress concept.
Select method B from the listbox. The calculation method B requires some additional inputs.
Inputs for method B The following input can be defined: No alternating keywway – load in only one direction Alternating torque with a slow torque increase Alternating torque with a fast torque increase Changes of load direction Maximum reverse torque Small outer diameter of stepped hub Large outer diameter of stepped hub Width of hub with dun Axial distance between load in and output position Chamfer on the shaft keyway edge Chamfer on the hub keyway edge keywya The method is based on the following simplifications: Constant surface pressure over the keyway length and height of keyway wall No consideration of chamfers or radii for the determination of supporting surfaces Limitations: Number of parallel keys For an inversion of the torque direction, method C cannot be used.
The method B has to be applied.
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If you click on the dimensioning buttons, you get a suggestion for an appropriate input value. The calculation of the value is carried out so that the given minimum safety is fulfilled.
The following dimensioning functions calculator button provide you with optimal support: In case there is no material that will fulfill the design requirements, then simply define your individual material. If you select this option, the input fields will be enabled, so that kehway can enter your own input values or add a comment. Please select the material from the list.
You will get detailed information on the material. That applies for shaft, hub and parallel key. The database allows you to select a parallel key. Selection dialog for parallel key geometry The database kehway the parallel key selection according to DIN sheet 1 to 3.