Series H End Cap Options

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Stroke adjustors are screw-type adjustable stops at end of rotation. They should be used when the exact final position of rotation is best determined on the assembled machinery or when final position requirements may vary with different machine set ups.

Internal Stroke Adjustors

Internal stroke adjustors permit 0-5° of adjustment. A threaded bushing within the end cap is set in position by a hex wrench inserted through the port and locked in place with a set screw.

External Stroke Adjustors

External stroke adjustors permit 0-20° of adjustment. The adjustor stop, which contains the port, is set in position with a wrench on external flats and locked in place with a jam nut.

Cushions

Cushions are designed to protect the actuator from damaging impact at the end of rotation. When properly sized and adjusted, cushions may also provide smooth deceleration, external energy absorption and noise reduction.

Cushions trap fluid at the end of stoke by blocking or restricting the discharge port. The trapped fluid is diverted through a small needle valve which generates a back pressure on the discharge side of the piston.

This back pressure resists the forces exerted on the rack by the propelling action of the actuator and the slowing of external mass which imparts energy into the actuator through the shaft. A check valve is included to bypass the cushion action at the start of rotation in the reverse direction.

Internal Stroke Adjustor & Adjustable Cushion

The 0-5° internal stroke adjustor and the adjustable cushion is combined into a single end of stroke option. The Ohio Oscillator design moves the cushion engagement position with the end of stroke adjustment so the full engagement length of the cushion is retained at any stroke adjustment setting. Not available on standard H6/Hl2 models-Consult factory.

External Adjustor & Fixed Cushion

A combined fixed orifice cushion and stroke adjustor is available on Ohio Oscillator hydraulic actuators. Like the air units, setting the stroke adjustment does not affect cushion engagement length. However, the amount of cushion effect is not adjustable in this option.

The fixed cushion orifice is sized to absorb the propelling torque developed on the working side of the actuator at speeds of less than 90°/sec and may not be sufficient to adequately stop additional inertial loads imparted through the shaft.

Air bleeds are not available with this option.

Double Rack Adjustor & Cushion Combinations

External stroke adjustors, (0-20°) and adjustable cushions are not available on single rack hydraulic units. Double rack units can be specified with external stroke adjustors on one rack (or end) and adjustable cushions on the other rack (or end.)

When independent adjustable cushions and external stroke adjustors are used, stroke reduction has a direct effect on cushion engagement. The cushion arc will be reduced by the amount of stroke reduction adjusted into the actuator.