Concurve® gearing is an exclusive version of our HTSR™ gear technology. This innovative gear tooth design is not a typical involute form. The Concurve is a “spur gear” with stronger teeth created for the strength and life cycle duty requirements of the United States military and is now available to you. Its primary application is found in parallel axis gear and gearbox designs. You will find a compelling comparison of Concurve gearing to involute gearing below.
 

• 50% more running time hours at equivalent loads
• 50% more torque capacity in the same frame size
• 33% smaller frame size to achieve equivalent torque capacity
• 90% minimum efficiency
• Low backlash
• Greater shock resistance due to larger stronger teeth

The unique shape of the Concurve gear tooth is one reason why ITW Heartland achieves continuous torque ratings that are two to six times greater than gearboxes or gear sets using standard involute tooth form in most applications.

Best Use

For burnishing external spur or helical gears from 50mm to 250mm, possibly larger depending upon the individual gear. Machine can be robotically loaded or hand-loaded and equipped with light curtain for ease of access and safety. Removes or reduces nicks, burrs, and heat-treat scale while improving surface finish. Used instead of honing and finish grinding when process calls for only nick, burr, and heat-treat scale removal. More universal application to accommodate large sun gears, external ring gears, speed gears and differential case gears.

Advantages

Very universal machine at a lower cost than a fully automatic burnisher, that can attain the same results as an automatic machine. Long tool life (500,000 to 750,000 cycles). Quick part-to-part changeover, less than 5 minutes.

Best Use

Process inspection for measuring composite, runout, nicks, size, tooth action, lead and taper. Capable of checking pinions, spurgears, external rings, internal rings, shaft gears, and speed gears.

Function

Measures part by manually loading the part on work holding and manually meshing the rolling master gear with the piece part. By activating start, switch piece part is automatically rolled against master gear and gear acquisition data is analyzed. Computerized results are displayed on monitor and operator is informed if part is good or bad. If bad, the gear data out of tolerance is noted.

Advantages

Simple to use, highly accurate and repeatable. Not dependent on operator judgment in measurement of gear. Durable for shop environment. Computerized screens for measurement data and graph displays. Customized operator screens, SPC software to include Xbar and R Charts and Histograms, Auto Calibration. Fully guarded and equipped with light curtain for ease of access and safety. Complete with computer, monitor, printer, and measurement device software.

Best Use

Semi-Automatic inspection machine can be used for audit inspection or inline inspection for measuring composite, runout, nicks, size, tooth action, lead and taper. Very versatile design which can be adapted to many needs. Capable of measuring shift gears (speed gears), planetary pinions, sun gears, external ring gears, internal ring gears, and shaft gears either spur or helical.

Function

Measures part automatically after being hand loaded. Once loaded, piece part is automatically meshed with rolling master gear. Computerized gear acquisition data is automatically analyzed and results are displayed on monitor. Parts can be sorted by size categories: good, reject, and repair. Parts must be clean of oil and dirt upon entering the machine. Cycle time is dependent upon the type of piece part.

Advantages

Less costly than a fully automatic machine yet very accurate and repeatable. Not dependent on operator judgment in measurement of gear. Durable for shop environment. Computerized screens for measurement data and graph displays. Customized operator screens, SPC software to include Xbar and R Charts and Histograms, Auto Calibration. Fully guarded and equipped with light curtain for ease of access and safety. Complete with computer, monitor, printer, and measurement device software.

Conquering big challenges in small spaces

HTSR™ Gearing (High Torque to Space Ratio) is exclusive to ITW Spiroid. Our designs and gears have been proven in military, aerospace, and industry applications for the past 50 years. HTSR™ Gearing is used in both right angle and inline applications.

There are times when traditional gearing methods simply will not provide the power and torque needs required within space or weight limitations. And that is exactly where HTSR™ Gearing will shine.

HTSR™ Gearing is designed to meet difficult application requirements, rather than modifying the application to the limited capability of a gearing method.

Solving the Unsolvable

ITW Heartland is the only partner for custom gears, gearbox design, and precision manufacturing you’ll ever need. For more than 40 years, our unique gearing solutions have served thousands of applications in dozens of industries. Our Spiroid®, Helicon®, Endicon®, and Concurve® gear designs featuring our High Torque to Space Ratio technology (HTSR™) are the solution for any gearing need.

ITW Heartland delivers economy, variety, complete service, and fast turnaround. We serve a variety of markets with specialty applications for:

• Aerospace

• Military & Defense

• Power Generation

• Transportation

• Robotics

HTSR – High Torque to Space Ratio

Conquering big challenges in small spaces.

HTSR™ Gearing (High Torque to Space Ratio) is exclusive to ITW Spiroid. Our designs and gears have been proven in military, aerospace, and industry applications for the past 50 years. HTSR™ Gearing is used in both right angle and inline applications.There are times when traditional gearing methods simply will not provide the power and torque needs required within space or weight limitations. And that is exactly where HTSR™ Gearing will shine.

HTSR™ Gearing is designed to meet difficult application requirements, rather than modifying the application to the limited capability of a gearing method.

HTSR™ Gearing can be applied to all the ITW Spiroid trademarked designs and is used in:

• Custom gearbox designs
• Spiroid® and Helicon® gearing
• Concurve® spur type gearing
• Endicon® indexing and coupling rings

Concurve® Gearing

Concurve® gearing is an exclusive version of our HTSR™ gear technology. This innovative gear tooth design is not a typical involute form. The Concurve is a “spur gear” with stronger teeth created for the strength and life cycle duty requirements of the United States military and is now available to you. Its primary application is found in parallel axis gear and gearbox designs. You will find a compelling comparison of Concurve gearing to involute gearing below.

• 50% more running time hours at equivalent loads 
• 50% more torque capacity in the same frame size
• 33% smaller frame size to achieve equivalent torque capacity 
• 90% minimum efficiency
• Low backlash
• Greater shock resistance due to larger stronger teeth

The unique shape of the Concurve gear tooth is one reason why ITW Heartland achieves continuous torque ratings that are two to six times greater than gearboxes or gear sets using standard involute tooth form in most applications.

Endicon® Couplings

Our Endicon® brand of indexing and face coupling rings are used for inline power transmission where zero backlash and precise location control are required. The two components are mirror images of each other and can transfer very high torque for inline applications.

• Self-centeringRigid and stiff coupling
• Very high load transfer capability
• Indexing calling out less than one degree of true position
• Accuracies within plus or minus 3 arc seconds
• Uniform tooth spacing with angular position repeatability of .000050 inch
• Variable tooth geometry for specific applications
• Material options for gear selected

Uses

An Endicon ring set can be used as a precise indexing device or as a face type coupling. While Endicon rings are useful in many applications, they are particularly valuable for these requirements:

1. Where space and/or weight limitations do not allow a conventional shaft coupling.
2. Where keys or splines are not sufficient for the torque load, or require excessive axial clearances for component assembly or disassembly.
3. Where finite incremental indexing of one member with respect to another is required.
4. Where quick disengagement is required.Where maximum rigidity is required.
5. Where positive engagement of two components must also be a common center.

Custom Gearboxes

HTSR™ Gearing concepts and designs are used in customized gearboxes around the world. ITW Heartland can design the custom gearing or an entire gearbox for your application. Whether inline, planetary, or right angle, a custom solution can be achieved with our proven design and engineering services.