Description
- AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 45.33:1 Ratio 2:1, StageB 3 – 21.72:1 Ratio 2:1
- Advances with two-speed, shift-on-the-fly gearbox
- Offers motor input for two CIM or NEO motors
- Utilizes strong AMPCO 18 Bronze dog gear
- Features customizable high and low gear ratios
- Enables pneumatic shifting for smooth operation
The AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 45.33:1 Ratio 2:1, StageB 3 – 21.72:1 Ratio 2:1 represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox is designed with an improved 4-tooth dog shifting method, allowing for seamless transitions between gears. It accommodates motor inputs from either two CIM or NEO motors and can be configured with two or three interior stages, offering flexibility in performance.
The gearbox features a robust design with a 1/8″ diameter shoulder screw and a dog gear made from AMPCO 18 Bronze, which provides enhanced strength and lubricity compared to previous stainless steel designs. The shift block assembly is reinforced with a larger bearing and threaded steel housing, ensuring durability and reliability. The input stage utilizes 32 DP gears and a 15-tooth pinion gear, achieving a high first stage reduction of 85:15.
Users have the ability to independently select high and low gear ratios, providing customization options not confined to preset spreads. The gearbox also supports various encoder options, including the US Digital E4T, enhancing its adaptability for different applications. Weight reduction features have been meticulously integrated into the gears and plates, optimizing the gearbox for performance without compromising strength.
The EVO Shifter employs a pneumatic shift method, utilizing a spring-extend pneumatic cylinder that allows for gear shifting even during acceleration or deceleration. This ensures continuous operation even if air pressure is lost, as the system defaults to “Ratio A” in such scenarios. The gearbox is compatible with existing mounting plate holes, facilitating easy installation onto an AM14U family chassis or a 2″x1″ box tube frame.
Note: Proper installation of the pinion gear requires specific procedures, including the use of a 3-ton arbor press for NEO motors, and the application of red Loctite 271 for CIM motors to ensure secure attachment.
View moreWhat’s Included
- 1x AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 45.33:1 Ratio 2:1, StageB 3 – 21.72:1 Ratio 2:1
- Shielded, flanged ball bearings
- 1117 steel 32 DP gears, with 20-degree pressure angle (1st stage)
- 4140 steel 20 DP gears, with 14.5-degree pressure angle (2nd and 3rd stage)
- 1/4″ thick aluminum side plates, pocketed
- US Digital encoder and pneumatic cylinder included
- 4140 steel output shafts
- Individual hardware within two-stage assembly
- 1x Red Tacky Grease, 14.2 gram
- 1x Encoder Mount Pad
- 1x EVO Shifter Shift Block Assembly
- 1x E4T Encoder
Specifications
- Two-speed, shift-on-the-fly gearbox
- Enhanced 4-tooth dog shifting method
- Compatible with two CIM or NEO motors
- Configurable with two or three internal stages
- Selection of various 1/2 inch output shafts
- Plates designed for mounting two motors
- Shipped assembled, without motors installed
- Dog gear with 4 dogs on each face for increased strength
- Robust 1/8″ diameter shoulder screw
- Dog gear material: AMPCO 18 Bronze
- Super-strong shift block assembly with larger bearing and threaded steel housing
- Input stage uses 32 DP gears and a 15-tooth pinion gear
- High 85:15 first stage reduction
- Independent high and low ratio selection
- More encoder options available
- Aggressive weight reduction features
- Cluster gears with identical features surrounding the bore on both sides
- Optional 3rd stage provides additional C ratio choice of 1.14 or 2:1
- Pneumatic shift method with spring-extend pneumatic cylinder
- Extend Stroke: 4 lbs, Retract Stroke: 15.7 lbs
- Included 15-tooth 32DP pinion gear
- Encoder ratio: 3:1 for 2-stage versions
Unconditional Satisfaction Guarantee
