Hydraulic type brake apparatus
AssigneeVolvo Construction Equipment Holding Sweden AB
InventorYeon Ho Kim
Life of this patent
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Abstract
The present invention relates to a hydraulic type brake system which includes a unit for adjusting a back pressure in a turn driving hydraulic circuit mounted in a construction heavy equipment such as an excavator, etc., and in particular to a hydraulic type brake apparatus which is used together with a relief valve installed various actuator driving hydraulic circuits for adjusting a back pressure in a lower flow side of a relief valve for thereby adjusting an opening pressure of a relief valve. There is provided a back pressure adjusting unit adapted to adjust an opening pressure of the relief valve by adjusting a back pressure of the hydraulic circuit in a lower flow portion of the relief valve based on a co-operation with the actuator.
Claims4
In an actuator driven hydraulic circuit which includes a hydraulic pump, an actuator connected with the hydraulic pump and driven, and a relief valve installed in a flow path connecting both flow paths connected in parallel between the hydraulic pump and the actuator, a hydraulic brake apparatus, comprising:
- a back pressure adjusting means adapted to adjust an opening pressure of the relief valve by adjusting a back pressure of the hydraulic circuit in a lower flow portion of the relief valve based on a co-operation with the actuator.
Dependencies are inferred from the claim text.