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I am currently writing a design procedure for the correct method for setting up bevel gears in a gearbox for optimum performance...
The most conclusive test of bevel and hypoid gears is their operation under normal running conditions in their final mountings. Testing not only maintains quality and uniformity during manufacture, but also determines if the gears will be satisfactory for their intended applications.
The modern day requirement for precision finished hobbed gears, coupled with the high accuracy characteristics of modern CNC hobbing machines, demands high tool accuracy.
Bevel gears must be assembled in a specific way to ensure smooth running and optimum load distribution between gears. While it is certainly true that the "setting" or "laying out" of a pair of bevel gears is more complicated than laying out a pair of spur gears, it is also true that following the correct procedure can make the task much easier. You cannot install bevel gears in the same manner as spur and helical gears and expect them to behave and perform as well; to optimize the performance of any two bevel gears, the gears must be positioned together so that they run smoothly without binding and/or excessive backlash.
In our last issue, we covered the basic principles of gear shaving and preparation of parts for shaving. In this issue, we will cover shaving methods, design principles and cutter mounting techniques.
Transmission of power between nonparallel shafts is inherently more difficult than transmission between parallel shafts, but is justified when it saves space and results in more compact, more balanced designs. Where axial space is limited compared to radial space, angular drives are preferred despite their higher initial cost. For this reason, angular gear motors and worm gear drives are used extensively in preference to parallel shaft drives, particularly where couplings, brakes, and adjustable mountings add to the axial space problem of parallel shaft speed reducers.
This article offers an overview of the practical design of a naval gear for combined diesel or gas turbine propulsion (CODOG type). The vibration performance of the gear is tested in a back-to-back test. The gear presented is a low noise design for the Royal Dutch Navy's LCF Frigate. The design aspects for low noise operation were incorporated into the overall gear system design. Therefore, special attention was paid to all the parameters that could influence the noise and vibration performance of the gearbox. These design aspects, such as tooth corrections, tooth loading, gear layout, balance, lubrication and resilient mounting, will be discussed.
Base helix error - the resultant of lead and profile errors is the measured deviation from the theoretical line of contact (Fig. 1). It can be measured in the same way that lead error on a spur gear is measured, namely, by setting a height gage to height H based on the radial distance r to a specified line of contact (Fig. 2), rotating the gear so as to bring a tooth into contact with the indicator on the height gage, and then moving the height gage along two or more normals to the plane of action. The theoretical line of contact on helical gear must be parallel to the surface plate, which is attained by mounting the gear on a sine bar (Fig. 3).
News Items About mounting
1 Stafford Offers Mounting Collars with Multiple Bore Designs (December 7, 2007)
Stafford recently introduced a universal mounting collar that can be supplied with different bore designs to fit rail mounts and other de... Read News
2 Reishauer Offers Wheel Mounting Cart (October 22, 2020)
The Reishauer Wheel Mounting Cart, ErgoMount, enables the machine operator to ergonomically and safely change grinding wheels and clampin... Read News
3 Röhm 3/2 Jaw Chuck, Clamp Mounting Assembly Tool and Live Center Solutions to be Displayed at EMO 2017 (August 21, 2017)
Röhm Products of America will showcase its industry-leading workholding innovations at EMO 2017 in Hanover, Germany, September 18-23... Read News
4 Exsys Tool SwissClamp Allows Mounting of Multiple Workpieces (February 18, 2016)
Exsys Tool Inc. has expanded its offering of ultra-high precision products to include the pL Lehmann SwissClamp modular clamping system. ... Read News