High-Efficiency Oil Pump

 Showa, having 14 years of experience in producing CVT oil pumps, has brought high-precision vane pumps with improved fuel efficiency into the market. A built-in control valve switches displacement volume between two conditions, so that the drive torque required by the pump under the controlled displacement condition is 40% less than that under the full-displacement condition, contributing to superior fuel performance that the market demands. High-precision manufacturing technology eliminates internal leaks to achieve superior efficiency and contributes to the realization of linear transmission shifts.

The use of Showa’s original volume switching valve has improved vehicle fuel economy

 In 2003, Showa launched a CVT oil pump that uses the engine crank output to rotate the vane pump through chain drive. The current latest design CVT oil pump has been in production since 2013.
 With its unique technology, Showa took the vane pump, which has higher displacement efficiency than the trochoid pump, and developed a CVT pump from it by adopting a design of two displacement oil paths. A built-in control valve switches the pump’s output between two displacement conditions, one for controlled displacement using only one port and another for full displacement using two ports. This built-in control valve also contributed to the size reduction. With this design, the drive torque required under controlled displacement at idling and mid-to-high rotation speeds is reduced by about 40%. Reduction of the loss of engine output contributes to the improvement of fuel economy.
 Internal leaks could be an issue when two ports are used under high loads when full flow is required. Leaks are significantly reduced by controlling the clearance between the rotor and side plate at micron levels, which ensures adequate amount of flow under high loads to improve transmission shift speeds of the CVT and overall drive performance.

High-Efficiency Oil Pump