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Preloaded Double Pinion

Your Professional Preloaded Double Pinion Manufacturer!

Kunshan Devotec Automation Co., Ltd. was established in 2012, but its origins trace back to an initial investment by the German company WMH HERION in Qingdao, Shandong Province in 2007. Since then, we have accumulated extensive experience in engineering, manufacturing, and quality control. As a specialist in drive technology, Kunshan Devotec Automation focuses on the production of high-precision gear racks, gears, pinions, gearboxes, linear guideways, and other linear transmission components. The company also serves as a partner for several European manufacturers in China, including , Graessner, and Hönger, providing localized sales and after-sales services.

Straight Teeth Preloaded Double Pinion
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Helical Teeth Preloaded Double Pinion
Helical Teeth Preloaded Double Pinions are special gear structures designed to address the issue of "tooth side clearance" in helical gear transmission systems. Through optimized mechanical...
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Why Choose Us

Our Factory
Our company boasts a factory area of approximately 5,000 square meters, with nearly all production processes performed in-house. This enables us to strictly control product quality and delivery times.

Advanced Equipment
Our company boasts advanced equipment such as machining centers, surface grinders, milling machines, straightening machines, and high-precision rack milling and grinding machines imported from KESEL and HABRAMA in Germany. These machines are among the world's leading. We also have our own heat treatment facilities, equipped with induction hardening, quenching and tempering machines, and case hardening equipment.

High Quality
To ensure consistently high quality standards and DIN 5 and DIN 4 accuracy, we have invested heavily in high-precision inspection and testing equipment, including coordinate measuring machines (CMM), spectrometers, and flaw detectors. As a high-tech enterprise, we are ISO 9001 certified.

Specifications

Module	3-8
Quality	DIN6e25
Material	20CrMnTi
Teeth Treatment	Ground
Gear Standard	ISO53
Pressure Angle	20°
Left Helix Angle	19°31′42″
Heat treatment	Case hardened

Advantages of Preloaded Double Pinion

Zero Backlash and Ultra-Precise Positioning: The core benefit is the elimination of play, leading to extremely accurate and repeatable positioning.

Consistent Performance: Accuracy and repeatability are maintained even during changes in motion direction and during acceleration and deceleration.

Mechanical Preload Option: Unlike some purely electronic preloaded systems, mechanical preload can be easily adjusted using a simple tool, which can simplify system design.

Cost-Effective Alternative: Preloaded double pinion can offer a competitive alternative to other high-precision systems like ball screws by reducing the need for multiple servo motors and complex electrical preload systems.

High Reliability & Higher Duty Cycles

For certain applications like rotary indexing tables, preloaded double pinions can offer higher reliability an

Improved Stiffness

In high-load applications, rack and pinion drives with preloaded double pinions can offer superior stiffness compared to ball screw drives, which can vary in stiffness.

Versatility

Preloaded double pinions are available with different gear types (spur or helical) and can be integrated with reducers and lubrication systems to provide complete linear or rotary drive solutions.

Applications of Preloaded Double Pinion

Machine Tools: Double pinions are used for precise movement of heavy loads in long travel machines. They maintain stiffness and accuracy in feed drives, providing an advantage over ball screws for gantry-style machines.

Aerospace: Applications include gantry machining of composite materials and ultrasonic inspection machines that require high accuracy in wet environments.

Automation and Robotics: The drives enable precise positioning in robotic arms and automated systems, improving accuracy and repeatability.

Additive Manufacturing: Preloaded double pinions are used in laser cutting gantries and large-scale 3D printers to optimize positioning accuracy.

Rotary Indexing Tables: Preloaded double pinions are used to drive rotary tables, ensuring backlash-free operation and higher reliability compared to worm gear drives.

Woodworking: High-speed CNC routers benefit from preloaded double pinions for precise positioning and repeatability on traveling gantry systems.

Steps for Setting Pinion Preload

Install your new bearings and seals

Press the new inner and outer pinion bearings onto the pinion shaft. Ensure proper seating using a hydraulic press or bearing driver tools. Lightly lubricate the bearings with gear oil to minimize friction during preload adjustment.Install the pinion seal into the housing using a seal driver to avoid damage.

Position the Pinion Gear

Place the pinion gear into the differential housing. For crush-sleeve setups, position the new sleeve onto the pinion shaft. For shim-style setups, insert the initial shim stack.

Assemble the Pinion Flange and Nut

Install the pinion flange over the shaft, followed by the washer and pinion nut. Tighten the nut to snug the components without over-tightening.

Incrementally Tighten the Pinion Nut

Using a breaker bar or impact wrench, tighten the pinion nut gradually. For crush-sleeve setups, this compresses the sleeve to bring the bearings into contact. For shim setups, it loads the bearings correctly.

Packaging and Shipping

1) Inner packing: rust-preventive oil application,vacuum packaging bag

2) Outer packing: wooden case or pallet

3) Customized packing is also available

4) Production Lead Time: 15-35 days after approved

Our certificates

FAQ

Q: How long is your delivery time?

A: If the item is in stock, it's usually 5-10 days. If the item is not in stock, it's 15-20 days, depending on the quantity.

Q: Do you provide samples? Are they free or additional?

A: Yes, we can provide free samples, but we don't cover the shipping costs.

Q: What is a preloaded double pinion (PDP)?

A: A preloaded double pinion is a gear configuration in a rack and pinion system designed to achieve zero backlash.
It consists of two pinions, each half the width of the rack, connected by a patented coupling system that creates a mechanical preload.

Q: How does preloaded double pinion work?

A: The two pinions are positioned to engage with opposite sides of the rack teeth.
The coupling applies a constant, opposing force between the two pinions, keeping them firmly in contact with the rack.
This constant contact eliminates any clearance or play (backlash) between the pinion teeth and the rack teeth.

Q: What happens if pinion preload is too high?

A: Too much preload and you destroy the bearings in the pinion (after a period of time). Not enough preload and your pinion is too floppy, which causes wear on the gears of the differential, premature seal failure, and the differential is usually noisy during operation.

Q: How to increase pinion bearing preload?

A: If the preload is too loose, remove shims so that the bearings will be tighter against the races and increase the preload. Once you've achieved the proper preload, lightly tap both ends of the pinion to seat the bearings, races and yoke.

As one of the leading preloaded double pinion manufacturers and suppliers in China, we warmly welcome you to buy high quality preloaded double pinion for sale here from our factory. For customized service, contact us now.

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