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Copyright © 2010 Chuetsu Metal Works Co., Ltd.. All rights reserved.
Introduction
Heavy Equipment Parts
Cylinder Barrels for Piston Pump & Motor
Chuetsu is a worldwide leader in the supply of hydraulic parts: cylinder barrels, piston shoes, and valve plates for piston pumps and motors. We have also developed and are now producing a bimetal piston shoe of composite design with a bronze lining on a ferrous material.
We also offer many sliding parts as well as bushings, thrust washers, and spacers that are all comprised of high strength brass, aluminum bronze and copper alloys.
Hydraulic Products
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Products > Products by Industry > Heavy Construction > Heavy Equip. Parts
Various Bearing Parts
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Shoes for Piston Pump and Motor
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- Port-Plate
- Pump (Bearing) Sleeve
- Guide-Ball
- Bronze bushing with oil-grooves
- Piston crown bearing
- Pins for Roller Tappets and Rocker Arms for Diesel Engines
- Camshaft Thrust Washers
- Sliding parts
- Flanged Bushings
- Washers
A hydrostatic transmission consists of a variable-displacement pump and a fixed or variable displacement motor, operating together in a closed circuit. In a closed circuit, fluid from the motor outlet flows directly to the pump inlet, without returning to the tank.
As well as being variable, the output of the transmission pump can be reversed, so that both the direction and speed of motor rotation are controlled from within the pump. This eliminates the need for directional and flow (speed) control valves in the circuit.
Because the pump and motor leak internally, which allows fluid to escape from the loop and drain back to the tank, a fixed-displacement pump called a charge pump is used to ensure that the loop remains full of fluid during normal operation. The charge pump is normally installed on the back of the transmission pump and has an output of at least 20% of the transmission pump's output.
In practice, the charge pump not only keeps the loop full of fluid, it pressurizes the loop to between 110 and 360 PSI, depending on the transmission manufacturer. A simple charge pressure circuit comprises the charge pump, a relief valve and two check valves, through which the charge pump can replenish the transmission loop. Once the loop is charged to the pressure setting of the relief valve, the flow from the charge pump passes over the relief valve, through the case of the pump or motor or both, and back to tank.
A hydrostatic transmission consists of a variable-displacement pump and a fixed or variable displacement motor, operating together in a closed circuit. In a closed circuit, fluid from the motor outlet flows directly to the pump inlet, without returning to the tank.
As well as being variable, the output of the transmission pump can be reversed, so that both the direction and speed of motor rotation are controlled from within the pump. This eliminates the need for directional and flow (speed) control valves in the circuit.
Because the pump and motor leak internally, which allows fluid to escape from the loop and drain back to the tank, a fixed-displacement pump called a charge pump is used to ensure that the loop remains full of fluid during normal operation. The charge pump is normally installed on the back of the transmission pump and has an output of at least 20% of the transmission pump's output.
In practice, the charge pump not only keeps the loop full of fluid, it pressurizes the loop to between 110 and 360 PSI, depending on the transmission manufacturer. A simple charge pressure circuit comprises the charge pump, a relief valve and two check valves, through which the charge pump can replenish the transmission loop. Once the loop is charged to the pressure setting of the relief valve, the flow from the charge pump passes over the relief valve, through the case of the pump or motor or both, and back to tank.
