ESDU 93001:2010
$126.75
Contact Stress in Disc Cams with Roller Followers
| Published By | Publication Date | Number of Pages |
| ESDU | 2010-07 | NA |
Follower type
Cams with roller followers (translating or swinging) can be
analysed. The algorithm used to calculate the compressive contact
stress at the surface (taken from ESDU 78035, Derivation 1) is
strictly applicable only to static contacts where no traction
forces act. In the contact zone between a cam and a crowned roller
follower traction forces (due to friction) may be present. However,
if the roller does not slip, the coefficient of friction is likely
to be very low (less than 0.1) and the values of compressive
contact stress predicted by the algorithm will be sufficiently
accurate.
Follower motion
The method presented in this Item can be used to analyse cams
with a wide range of profiles. In cam design the relationship
between the motion of the cam and the motion of the follower,
during a dwell-rise-dwell (DRD) or a dwell-return-dwell (DRD)
motion, is usually governed by a mathematical equation known as a
cam law (see ESDU 82006, Reference 5).
Although the theory (presented in Section 3 of this Item) is
general, in that any mathematical cam law can be specified the
computer program contains only six commonly-used cam laws
(identified in Entry 11, Section 7.3.1). If the required cam law
for a particular motion segment is not included in the current
version of ESDUpac A9301 then the data can be entered as a motion
data file. This motion data file must contain values of follower
displacement, follower velocity, follower acceleration and follower
jerk at intervals of one degree of cam rotation. The required
format of the file is described in Section 7.3.2 and the reasons
for specifying motion in this way are explained in Section
4.1.1.
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