Shafts, spline shafts Flóra Hajdu B406 hajdfl@sze.hu

Content Shafts Spline shafts and spline hubs 2019.07.04. Hajdu Flóra

Shafts Purpose of shafts carrying rotating machine parts transferring loads and torque

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK CAD model of a shaft

Technical drawing of a shaft

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Technical drawing of a shaft

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Technical drawing of a shaft

Aspects of shaft design Divided design To reduce stress, rounds, chamfers, transitions, undercuts

Reduce stress

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Shaft ends

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Shaft ends Source: Standards by István Házkötő

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Shaft ends Source: Standards by István Házkötő

Shaft ends Source: Standards by István Házkötő

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Undercuts

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Undercuts

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Undercuts in case of threads

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Undercuts, runouts in case of threads

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Center holes During the manufacturing process, center holes are used to support the shafts and as a basis

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Center holes

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Center holes

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Center holes Simplified dimensioning e.G „A” type with d1 = 2 mm dimension center hole

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Undercut for axial retaining ring Standardized undercut

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. 2019.07.04. Hajdu Flóra

Splines Advantage: Disadvantage 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. 2019.07.04. Hajdu Flóra

Splines - fits Source: C. Jensen, J. D. Helsel, D. R. Short: Engineering Drawing&Design 2019.07.04. Hajdu Flóra

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

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK CAD model of spline shaft

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Technical drawing of spline shaft A borda kialakítása DIN 5464 szerint

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK CAD model of spline hub

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Technical drawing of spline hub

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Representation of splines - realistic Detailed Simplified

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Representation of splines - schematic

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Representation of splines - schematic

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Dimensioning splines Shape of splines Standard Quantity Inner diameter Outer diameter Width of splines Tolerances

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Standardized splines Source: Standards by István Házkötő

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Standardized spline dimensions Source: Standards by István Házkötő

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Standardized splines Source: Standards by István Házkötő

MECHATRONIKA ÉS GÉPSZERKEZETTAN TANSZÉK Tolerances of splines Source: Standards by István Házkötő

Summary Shafts Design Rounds, chamfers Undercuts, grooves Shaft ends Spline shafts and spline hubs Next week: Bearings

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