A Solenoid for Smooth Gear Changes
Customer Problem
TLX Technologies was approached by a manufacturer to design a valve for an all-terrain vehicle (ATV) automatic transmission. An automatic transmission uses a sophisticated hydraulic system that routes transmission fluid through a series of passages in the valve body to select the appropriate gear ratio. To facilitate smooth gear changes, the manufacturer needed a valve with precise variable pressure control that could reliably operate while continuously submerged in hot automatic transmission fluid.
The TLX Solution
TLX designed a three-way proportional pressure reducing/relieving valve for the manufacturer. This normally open, direct-acting solenoid valve used a control current ranging from 0 to 1.5 amps. When unpowered, the valve was fully open. When powered, the valve’s plunger would travel proportional to the amount of current applied, providing continuously variable pressure regulation. The valve was capable of operating in automatic transmission fluid temperatures as high as 93°C (200°F).
Three-Way Proportional Pressure Reducing/Relieving Valve
- Supply voltage
- 10 to14 Vdc
- Control current signal
- 0 to 1.5 A
- Coil resistance at 20°C
- 5.7 Ω ± 0.05 Ω
- Supply pressure
- 1,207 kPa ± 120 kPa
- Flow rate at 1,207 kPa
- > 16 cc/sec
- Max operating temperature
- 93°C (200°F) fluid temperature
- Flow rate inlet to control
- 2.84 L/min
- Fluid type
- Automatic transmission fluid
Every TLX solution is custom engineered to meet the requirements of its application. Technical specifications shown on this website are intended to illustrate typical performance and design characteristics.
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