Boston Open Gearing
Boston Gears
- Spur gears and rack
- Change gears
- Stem pinions and pinion wire
- Internal gears
- Helical gears
- Worm and worm gears
- Bevel and miter gears
- Non-metallic gears
- Delroyd worm gear sets
Spur Gears
Boston spur gears are designed to transmit motion and power between
parallel shafts. Configurations include spur, rack, pinion wire, stem pinions
and internal gears; most with a selection of bores, keyways and set
screws. Fine-pitch gears are available in plastic, brass, stainless steel and
steel. Heavier pitch spurs are available in steel and cast iron. Styles
include plain, web, web with lightening holes or spoked. Change gears
have consecutive numbers of teeth for a variety of ratios.
Boston Gear manufactures both 14-1/2° and 20°PA, involute, full depth
system gears. While 20°PA is generally recognized as having higher load
carrying capacity, 14-1/2°PA gears have extensive use. The lower pressure
angle results in less change in backlash due to center distance variation
and concentricity errors. It also provides a higher contact ratio and is
consequently a smoother, quieter operation provided that the undercut of
the teeth is not present.
Helical Gears
Boston helical gears are stocked both right and left hand, made with a 45°
helix angle. They are designed to transmit motion and power between nonintersecting
shafts which are positioned either parallel (opposing hand) or
at 90° to each other (same hand). Because these gears are top-hobbed, there
is extremely close concentricity between the pitch diameter and the outside
diameter.
Helical gears offer additional benefits relative to Spur Gears, those being:
– Improved tooth strength due to the elongated helical wrap-around.
– Increased contact ratio due to the axial tooth overlap.
– Helical Gears tend to have greater load carrying capacity than Spur Gears
of similar size.
– Because of the above, smoother operating characteristics are apparent.
All Boston Helicals are cut to the Transverse Diametral Pitch System, resulting
in a higher Normal Diametral Pitch Number.
Miter And Bevel Gears
Boston miter and bevel gears are designed for transmission of motion and
power between intersecting shafts positioned at a right angle. Straight tooth
miter and bevel gears are cut with a generated tooth form having a localized
lengthwise tooth bearings known as the “Coniflex”® tooth form. The superiority
of these gears over straight bevels with full length tooth bearing lies in the control
of tooth contact. The localization of contact permits minor adjustment of
the gears in assembly and allows for some displacement due to deflection
under operating loads, without concentration of the load on the end of the
tooth. This results in increased life and quieter operation.
Spiral tooth form miter and bevel gears are suited for higher speed and larger
torque applications.
®Registered trademark of The Gleason Works.
Worms And Worm Gears
Boston Gear worms and worm gears provide an effective answer for such
power transmission applications as high-ratio speed reduction, limited space,
right-angle shafts and non-intersecting shafts. When properly applied, they are
the smoothest and quietest form of gearing. Steel worms and cast iron or
bronze worm gears having throated teeth are available in single or multiple
threads, 48 to 3 diametral pitch or up to 85" pitch diameter. Acetal worms
and worm gears are available in 48, 32 and 24 diametral pitches.
The efficiency of a worm gear drive depends on the lead angle and number of
starts on the worm. The angle generally decreases with increasing ratio and
worm pitch diameter. For increased efficiency the ratio should be kept low.
For more information about our Boston Gears products please Contact Us
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