Drive systems for mining apparatus
AssigneeGewerkschaft Eisenhutte Westfalia
InventorWulff Rosler
Life of this patent
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Abstract
A drive system, particularly for mining apparatus employing chains, which has a fluid control circuit coupled to a ring gear of planetary gearing transmitting drive from a motor. The control circuit has a pump drivably coupled to the ring gear and the fluid outlet from the pump can be blocked to lock the ring gear and permit transmission of force through the planetary gearing. In the event of abnormal loading the outlet from the pump is opened automatically to allow fluid to flow at a pre-determined flow rate. This in turn allows the ring gear to rotate to break the transmission and the system can be gently braked without danger.
Claims16
A drive system comprising electric drive means, a gearing unit for transmitting drive from the drive means and hydraulic control means composed of at least one pump coupled to the gearing unit and an associated hydraulic circuit having means settable to a locked state permitting transmission of drive through the gearing unit or to an unlocked state where pressure fluid passes through a throttle device to interrupt the transmission of drive and to exert a controlled braking effect on the drive system, wherein the gearing unit at least includes planetary gearing with a ring gear drivably coupled to the pump, the planetary gearing having a sun wheel carried by an input shaft drivably coupled to an output stage of the gearing unit, means for locking the sun wheel and means for feeding pressure fluid to the pump to cause the pump to act as a motor to rotate the ring gear and thereby drive the output stage of the gearing unit.
A drive system comprising electric drive means, a gearing unit for transmitting drive from the drive means and hydraulic control means composed of at least one pump coupled to the gearing unit and an associated hydraulic circuit at least part of which is settable to a locked state permitting transmission of drive through the gearing unit or to an unlocked state where pressure fluid passes through a throttle device to interrupt the transmission of drive and to exert a controlled braking effect on the drive system, wherein the hydraulic circuit includes a valve device arranged to connect the pump outlet through the throttle device to a fluid reservoir to bring the circuit into the unlocked state and to break the connection to bring the circuit into the locked state, and wherein the hydraulic circuit has a pressure relief valve means which automatically actuates the valve device to bring the circuit into its unlocked state when the load on the gearing unit exceeds a certain level and thereby produces a corresponding increase in the value of the pressure of the fluid in part of the hydraulic circuit.
Dependencies are inferred from the claim text.