Spiral Bevel Gears

TECHNICAL ARTICLES | 2015-09-01

Development of a Face Hobbed Spiral Bevel Gearset

This article is the fourth installment in Gear Technology's series of excerpts from Dr. Hermann J. Stadtfeld's book, Gleason Bevel Gear Technology. The first three excerpts can be found in our June, July and August 2015 issues. In the previous chapter, we demonstrated the development of a face-milled spiral bevel gearset. In this section, an analogue face-hobbed bevel gearset is derived.

INDUSTRY NEWS | 2015-08-21

Suhner Spiral Bevel Gears Offer High Power, Low Backlash and Low Noise

Each year, increased engine and motor power require more powerful angle gear heads. Engineers in the tool-making and industrial hand too...

GEAR TALK WITH CHUCK | 2014-11-11

The War to End All Wars

[starbox] As the son of a World War II sailor, I was raised with an honest respect for our nation’s veterans. The massive size of WW II and its ...

TECHNICAL ARTICLES | 2014-08-01

Setting Load Parameters for Viable Fatigue Testing of Gears in Powertrain Axles Part I: Single-Reduction Axles

This presentation introduces a new procedure that - derived from exact calculations - aids in determining the parameters of the validation testing of spiral bevel and hypoid gears in single-reduction axles.

INDUSTRY NEWS | 2014-05-01

Industry News

The complete Industry News section from the May 2014 issue of Gear Technology.

TECHNICAL ARTICLES | 2012-01-01

Accelerating Validation Testing

Bringing new or improved products to market sooner has long been proven profitable for companies. One way to help shorten the time-to-market is to accelerate validation testing. That is, shorten the test time required to validate a new or improved product.

TECHNICAL ARTICLES | 2011-06-01

Drive Line Analysis for Tooth Contact Optimization of High-Power Spiral Bevel Gears

In the majority of spiral bevel gears, spherical crowning is used. The contact pattern is set to the center of the active tooth flank and the extent of the crowning is determined by experience. Feedback from service, as well as from full-torque bench tests of complete gear drives, has shown that this conventional design practice leads to loaded contact patterns, which are rarely optimal in location and extent. Oversized reliefs lead to small contact area, increased stresses and noise, whereas undersized reliefs result in an overly sensitive tooth contact.

TECHNICAL ARTICLES | 2011-06-01

Hypoid Gears: Tribology Aspects in Angular Transmission Systems, Part VII

Hypoid gears are the paragon of gearing. To establish line contact between the pitches in hypoid gears, the kinematically correct pitch surfaces have to be determined based on the axoids. In cylindrical and bevel gears, the axoids are identical to the pitch surfaces and their diameter or cone angle can be calculated simply by using the knowledge about number of teeth and module or ratio and shaft angle. In hypoid gears, a rather complex approach is required to find the location of the teeth—even before any information about flank form can be considered. This article is part seven of an eight-part series on the tribology aspects of angular gear drives.

TECHNICAL ARTICLES | 2011-05-01

Beveloid & Hypoloid Gears

Beveloids are helical gears with nonparallel shafts, with shaft angles generally between 5 degrees and 15 degrees. This is part VI in the Tribology Aspects in Angular Transmission Systems Series

TECHNICAL ARTICLES | 2011-03-01

Optimal Modifications of Gear Tooth Surfaces

In this paper a new method for the introduction of optimal modifications into gear tooth surfaces - based on the optimal corrections of the profile and diameter of the head cutter, and optimal variation of machine tool settings for pinion and gear finishing—is presented. The goal of these tooth modifications is the achievement of a more favorable load distribution and reduced transmission error. The method is applied to face milled and face hobbed hypoid gears.

TECHNICAL ARTICLES | 2011-01-01

Spiral Bevel Gears: Tribology Aspects in Angular Transmission Systems, Part IV

This article is part four of an eight-part series on the tribology aspects of angular gear drives. Each article will be presented first and exclusively by Gear Technology, but the entire series will be included in Dr. Stadtfeld’s upcoming book on the subject, which is scheduled for release in 2011.

TECHNICAL ARTICLES | 2010-11-01

Zerol Bevel Gears: Tribology Aspects in Angular Transmission Systems, Part III

Zerol bevel gears are the special case of spiral bevel gears with a spiral angle of 0°. They are manufactured in a single-indexing face milling process with large cutter diameters, an extra deep tooth profile and tapered tooth depth.

PRODUCT NEWS | 2009-07-01

Gear Milling on Non-Gear Dedicated Machinery

Imagine the flexibility of having one machine capable of milling, turning, tapping and gear cutting with deburring included for hard and soft material. No, you’re not in gear fantasy land. The technology to manufacture gears on non gear-dedicated, mult-axis machines has existed for a few years in Europe, but has not yet ventured into mainstream manufacturing. Deckel Maho Pfronten, a member of the Gildemeister Group, took the sales plunge this year, making the technology available on most of its 2009 machines.

TECHNICAL ARTICLES | 2008-09-01

Lapping and Superfinishing Effects on Surface Finish of Hypoid Gears and Transmission Errors

This presentation is an expansion of a previous study (Ref.1) by the authors on lapping effects on surface finish and transmission errors. It documents the effects of the superfinishing process on hypoid gears, surface finish and transmission errors.

PRODUCT NEWS | 2008-09-01

GPSys Critical to Spiral Bevel Gear Life

Impact Technologies considers commercial version of software package.

TECHNICAL ARTICLES | 2008-01-01

Evaluation of a Low-Noise, Formate Spiral Bevel Gear Set

Studies to evaluate low-noise Formate spiral bevel gears were performed. Experimental tests were conducted on a helicopter transmission test stand...

TECHNICAL ARTICLES | 2007-09-01

The New Freedoms: Bevel Blades

Today, because of reduced cost of coatings and quicker turnaround times, the idea of all-around coating on three-face-sharpened blades is again economically viable, allowing manufacturers greater freedoms in cutting blade parameters, including three-face-sharpened and even four-face-sharpened blades.

TECHNICAL ARTICLES | 2007-07-01

Spiral Bevel and Hypoid Gear Cutting Technology Update

Spiral bevel and hypoid gear cutting has changed significantly over the years. The machines, tools, processes and coatings have steadily advanced.

TECHNICAL ARTICLES | 2007-05-01

New Developments in TCA and Loaded TCA

How the latest techniques and software enable faster spiral bevel and hypoid design and development.

INDUSTRY NEWS | 2006-01-10

Bison Gear Appoints New Preident, Executive Vice President

Larry Kujovich was appointed president of Bison Gear and Engineering. The company also promoted George Thomas to executive vice president...

TECHNICAL ARTICLES | 2006-01-01

Kinematical Simulation of Face Hobbing Indexing and Tooth Surface Generation of Spiral Bevel and Hypoid Gears

In addition to the face milling system, the face hobbing process has been developed and widely employed by the gear industry. However, the mechanism of the face hobbing process is not well known.

TECHNICAL ARTICLES | 2006-01-01

Assembling Spiral Gears: Double Taper Can Be Double Trouble

Bevel gear systems are particularly sensitive to improper assembly. Slight errors in gear positioning can turn a well-designed, quality manufactured gear set into a noisy, prone-to-failure weak link in your application.

FEATURE ARTICLES | 2005-05-01

New Approaches in Roll Testing Technology of Spiral Bevel and Hypoid Gear Sets

This paper presents a new approach in roll testing technology of spiral bevel and hypoid gear sets on a CNC roll tester applying analytical tools, such as vibration noise and single-flank testing technology.

REVOLUTIONS | 1999-07-01

Revolutions

Welcome to Revolutions, the column that brings you the latest, most up-to-date and easy-to-read information about the people and technology of the gear industry.

TECHNICAL ARTICLES | 1998-05-01

Hobs & Form Relived Cutters: Common Sharpening Problems

Fig. 1 shows the effects of positive and negative rake on finished gear teeth. Incorrect positive rake (A) increase the depth and decreases the pressure angle on the hob tooth. The resulting gear tooth is thick at the top and thin at the bottom. Incorrect negative rake (B) decreases the depth and increases the pressure angle. This results in a cutting drag and makes the gear tooth thin at the top and thick at the bottom.

FEATURE ARTICLES | 1997-09-01

Who's Who and What's What At Gear Expo '97

Below are listed the Gear Technology advertisers exhibiting at Gear Expo 97.

EVENTS | 1997-03-01

Technical Calendar

Complete Technical Calendar for March/April 1997.

TECHNICAL ARTICLES | 1988-05-01

Tooth Root Stresses of Spiral Bevel Gears

Service performance and load carrying capacity of bevel gears strongly depend on the size and position of the contact pattern. To provide an optimal contact pattern even under load, the gear design has to consider the relative displacements caused by deflections or thermal expansions expected under service conditions. That means that more or less lengthwise and heightwise crowning has to be applied on the bevel gear teeth.

TECHNICAL ARTICLES | 1986-09-01

Gears for Nonparallel Shafts

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.

TECHNICAL ARTICLES | 1986-09-01

Pressure Angle Changes in the Transverse Plane for Circular Cut Spiral Bevel Gears

Recently it has been suggested that the transverse plane may be very useful in studying the kinematics and dynamics of spiral bevel gears. The transverse plane is perpendicular to the pitch and axial planes as shown in Fig. 1. Buckingham has suggested that a spiral bevel gear may be viewed as a limited form of a "stepped" straight-tooth gear as in Fig. 2. The transverse plane is customarily used in the study of straight toothed bevel gears.

TECHNICAL ARTICLES | 1986-03-01

A Computer Solution for the Dynamic Load, Lubricant Film Thickness, and Surface Temperatures in Spiral-Bevel Gears

Spiral-bevel gears, found in many machine tools, automobile rear-axle drives, and helicopter transmissions, are important elements for transmitting power.

TECHNICAL ARTICLES | 1985-07-01

Influence of Relative Displacements Between Pinion and Gear on Tooth Root Stresses of Spiral Bevel Gears

The manufacturing quality of spiral bevel gears has achieved a very high standard. Nevertheless, the understanding of the real stress conditions and the influences. of certain parameters is not satisfactory.

TECHNICAL ARTICLES | 1985-01-01

Analyzing Gear Tooth Stress as a Function of Tooth Contact Pattern Shape and Position

The development of a new gear strength computer program based upon the finite element method, provides a better way to calculate stresses in bevel and hypoid gear teeth. The program incorporates tooth surface geometry and axle deflection data to establish a direct relationship between fillet bending stress, subsurface shear stress, and applied gear torque. Using existing software links to other gear analysis programs allows the gear engineer to evaluate the strength performance of existing and new gear designs as a function of tooth contact pattern shape, position and axle deflection characteristics. This approach provides a better understanding of how gears react under load to subtle changes in the appearance of the no load tooth contact pattern.

TECHNICAL ARTICLES | 1984-08-01

Precision Forged Spiral Bevel Gears

A recent U.S. Army Tank-Automotive Command project, conducted by Battelle's Columbus Laboratories. successfully developed the methodology of CAD/CAM procedures for manufacturing dies (via EDM) for forging spiral bevel gears. Further, it demonstrated that precision forging of spiral bevel gears is a practical production technique. Although no detailed economic evaluation was made in this study, it is expected that precision forging offers an attractive alternative to the costly gear cutting operations for producing spiral bevel gears.

TECHNICAL ARTICLES | 1984-08-01

Determination of Gear Ratios

Selection of the number of teeth for each gear in a gear train such that the output to input angular velocity ratio is a specified value is a problem considered by relatively few published works on gear design.