Nexen PRD1100 966902 - Manual (Page 6)

6 FORM NO. L-21274-A-0113
PROPER SYSTEM ALIGNMENT
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
conversely, 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. The
following guidelines will ensure this is achieved.
1. See Figures 1 and 2.
2. 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).
3. The Pinion Shaft must be supported adequately to
ensure full contact of roller pins along the face of ring
gear teeth.
4. Once the RPG-B system is properly installed and
preloaded verify the meshing tooth pattern is correct
as outlined in the System Alignment Verification
section on Page 11.
Gear
90˚
Pinion
Shaft
Axis of
Rotation
This distance must remain
concentric within
0.02 mm [ 0.0008 in]
Figure 1 Pinion Alignment Requirements
Fixed Ring Gear
A
B
.02 mm B
.02 mm A
.02 mm B
.02 mm A
//
Rotating
Mounting
Ring
Axis of
Rotation
Support
Base
Figure 2 Possible Mounting Configurations
Tolerances Allowed In Roller Pinion Setup
Additional dimensional detail can be found in Nexen’s
product drawings.
MOUNTING SURFACE DETAILS
The surface used to mount the RPG-B should be machined
to a flatness of .050mm as shown to ensure proper
alignment. See Figure 1.
All provided provisions for fasteners should be utilized.
Make sure there is proper clearance around the gearbox
as seen in Figure 1.
INSTALLATION
S
yStem
m
ountinG
• Clean and check all mounting surfaces before
assembly. Contamination from dirt or machining burrs
can affect system performance.
• Position the system on the mounting surface. There
are threaded holes available in the bearing to use as
lift points, typically M12 x 1.75.
• To center the system, Nexen recommends using
the OD of the teeth as a reference dimension for
alignment.
• Once the system is in location, install the provided
mounting bolts. Tighten the bolts in a star pattern to
ensure even distribution of load.
D
ial
P
late
m
ountinG
(o
utPut
)
• The dial plate is designed to be piloted by a series of
dowel pins installed in the plate and that straddle the
male pilot on the ring drive. Drawings are available for
each specific size, which will aid in understanding the
method of piloting the dial plate.
• The dial plates should be mounted using all available
holes. Again, tighten in a star pattern to ensure even
load distribution. It is the responsibility of the customer
to ensure the bolt grade and quantity is sufficient for
the application.