Understanding the Design and Function of Shafts in Machinery
Explore the role of shafts in transferring loads and torque within rotating machine parts, focusing on design aspects like stress reduction, rounded features, chamfers, and transitions. Discover the importance of undercuts and center holes in shaft manufacturing.
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Shafts, spline shafts Fl ra Hajdu B406 hajdfl@sze.hu
Content Shafts Spline shafts and spline hubs 2024. 12. 07. Hajdu Fl ra
Shafts Purpose of shafts carrying rotating machine parts transferring loads and torque
Aspects of shaft design Divided design To reduce stress, rounds, chamfers, transitions, undercuts
Shaft ends 10
Shaft ends Source: Standards by Istv n H zk t 11
Shaft ends Source: Standards by Istv n H zk t 12
Shaft ends Source: Standards by Istv n H zk t 13
Undercuts 14
Undercuts 15
Center holes During the manufacturing process, center holes are used to support the shafts and as a basis 18
Center holes Forr s: http://turning.fw.hu/t006.html 19
Center holes 20
Center holes Simplified dimensioning e.G A type with d1 = 2 mm dimension center hole 21
Undercut for axial retaining ring Standardized undercut 22
Splines A splined shaft is a shaft having multiple grooves, or keyseats, cut around its circumference for a portion of its length, in order that a sliding engagement may be made with corresponding internal grooves of a mating part. carrying heavier loads than keys, permit lateral movement of a part, parallel to the axis of the shaft, while maintaining positive rotation, and allow the attached part to be indexed or changed to another angular position. 2024. 12. 07. Hajdu Fl ra
Splines Advantage: Even torque transmission Concentricity High load capacity Disadvantage expensive Space requirement
Splines Involute splines: similar in shape to involute gear teeth but have pressure angles of 30 , 37.5 , or 45 . 2 types of fits: side fit and the major diameter fit Straight-Side Splines: The most popular are the SAE straightside splines. They have been used in many applications in the automotive and machine industries. Serrations: shallow, involute splines with 45 pressure angles. They are primarily used for holding parts, such as plastic knobs, on steel shafts. 2024. 12. 07. Hajdu Fl ra
Splines - fits Source: C. Jensen, J. D. Helsel, D. R. Short: Engineering Drawing&Design 2024. 12. 07. Hajdu Fl ra
Splines Torque transmission is approximately even High torque with relatively narrow binding Due to the design of the ribs, it can have a significant stress-collecting effect Profiles: Involute splines, Straight-side splines, Serrations Application: machine tools, vehicles Fastening by shape Maing surfaces often slip Harding and grinding of ribs Centering straight-side splines: internal lead, external lead, spline lead Production: milling Forr s: Nagy L szl : Mez gazdas gban haszn latos g pelemek megismer se
Spline application Forr s: Wikip dia Zinner Gy rgy: G pj rm vek er tviteli berendez sei
Technical drawing of spline shaft A borda kialak t sa DIN 5464 szerint 30
Representation of splines - realistic Detailed Simplified 33
Dimensioning splines Shape of splines Standard Quantity Inner diameter Outer diameter Width of splines Tolerances 36
Standardized splines Source: Standards by Istv n H zk t 37
Standardized spline dimensions Source: Standards by Istv n H zk t 38
Standardized splines Source: Standards by Istv n H zk t 39
Tolerances of splines Source: Standards by Istv n H zk t 40
Summary Shafts Design Rounds, chamfers Undercuts, grooves Shaft ends Spline shafts and spline hubs Next week: Bearings
