Shafts spline shafts Flra Hajdu B 406 hajdflsze

Shafts, spline shafts Flóra Hajdu B 406 hajdfl@sze. hu

Content • Shafts • Spline shafts and spline hubs 2021. 03. 08. Hajdu Flóra

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

CAD model of a shaft 4

Technical drawing of a shaft 5

Technical drawing of a shaft 6

Technical drawing of a shaft 7

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

Reduce stress

Shaft ends 10

Shaft ends Source: Standards by István Házkötő 11

Shaft ends Source: Standards by István Házkötő 12

Shaft ends Source: Standards by István Házkötő 13

Undercuts 14

Undercuts 15

Undercuts in case of threads 16

Undercuts, runouts in case of threads 17

Center holes During the manufacturing process, center holes are used to support the shafts and as a basis 18

Center holes Forrás: http: //turning. fw. hu/t 006. html 19

Center holes 20

Center holes Simplified dimensioning e. G „A” type with d 1 = 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. 2021. 03. 08. Hajdu Flóra

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. 2021. 03. 08. Hajdu Flóra

Splines - fits 2021. 03. 08. Source: C. Jensen, J. D. Helsel, D. R. Short: Engineering Drawing&Design 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 Forrás: Nagy László: Mezőgazdaságban használatos gépelemek megismerése