Nexen RPS16G-C0070T/360-EP2U 966554 - Manual (Page 7)

7 FORM NO. L-21252-B-1209
A
B
.02 mm B
.02 mm A
.02 mm B
.02 mm A
//
Rotating
Mounting
Ring
Axis of
Rotation
Support
Base
Gear
90˚
Pinion
Shaft
Axis of
Rotation
This distance must remain
concentric within
0.02 mm [ 0.0008 in]
PROPER SYSTEM ALIGNMENT
Figure 2 Possible Mounting Configurations
The RPG system is available as solid round gears, seg-
mented gears, or arc segments with internal or external
teeth. The instructions that follow will use the reference
“ring gears” but applies universally to all cases.
Unlike traditional gear systems, the RPG System operates
with no mechanical clearance and requires a preload. For
optimal performance the preload must remain as constant
as possible as the ring gear travels past the pinion, or con-
versely, the pinion orbits around the stationary ring gear.
To achieve this the ring gear and pinion concentricity and
axial variance and pinion axis concentricity and parallelism
to the axis of rotation must be well maintained. To verify
these conditions have been met it is recommended that
the supporting structure and bearing systems are in place
and the RPG system is installed last. This will allow a dial
indicator to be positioned where the pinion will be located
and the system rotated to verify variance before and dur-
ing the ring gear installation. The following guidelines will
ensure this is achieved.
a) The ring gear must be mounted on a step in the mount-
ing surface that supports the inner diameter of the ring
gear and the side of the ring gear opposite the product
number and is rigid enough to prevent deflection that
would affect pinion preload. The ring gear mounting
surface concentric with the axis of rotation must have
variance less than (- 0.02 mm [- 0.0008 in.]) and be
within (± 0.02 mm [± 0.0008 in.]) of the gears inner
diameter to provide a tight fit. The mounting surface
perpendicular to the axis of rotation must have variance
less than (± 0.02 mm [± 0.0008 in.]). This applies
whether the ring gear is bearing supported and rotates
or is fixed in place and the pinion orbits the ring gear.
See figures 1 and 2.
b) The Pinion axis of rotation must be concentric (±0.02
mm [± 0.0008 in]) to the axis of rotation of the ring
gear and the angle between the Pinion Shaft axis and
the plane the ring gear is in must be exactly 90° (Refer
to Figure 1).
c) The Pinion Shaft must be supported adequately to
ensure full contact of roller pins along the face of ring
gear teeth.
d) Once the RPG system is properly installed and pre-
loaded verify the meshing tooth pattern is correct as
outlined in the System Alignment Verification section
on Page 14.
Figure 1 Pinion Alignment Requirements
Systems may be mounted at any angle as long as the
gears axis rotation remains parallel with the pinions
axis of rotation.
A
B
.02 mm B
.02 mm A
.02 mm B
.02 mm A
//
Rotating
Mounting
Ring
Axis of
Rotation
Support Base
Pinion Preload
Mechanism
Tolerances Allowed In Roller Pinion Setup
Additional dimensional detail can be found in Nexen’s
product drawings.
Fixed Ring Gear
Drive Rotating Around Fixed Ring Gear