US2013341133A1PendingUtilityA1

Shovel and method of controlling shovel

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Assignee: SANO KIMINORIPriority: Mar 30, 2011Filed: Mar 29, 2012Published: Dec 26, 2013
Est. expiryMar 30, 2031(~4.7 yrs left)· nominal 20-yr term from priority
Inventors:Kiminori SanoRyuji Shiratani
B60L 1/003B60L 2200/40B60L 50/20B60L 2210/40B60L 2240/80B60L 50/61B60L 15/2009B60L 2240/421E02F 9/128B60L 2240/423E02F 3/32B60L 2210/12E02F 9/2075B60L 2240/12E02F 9/2083B60L 7/14B60L 2210/14E02F 9/20E02F 9/22Y02T10/72Y02T10/7072Y02T10/62Y02T10/64Y02T10/70B60L 58/12
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Claims

Abstract

A shovel includes a turning electric motor configured to drive a turning body to turn and a turning brake hydraulic motor mechanically connected to the turning body or the turning electric motor. In a state where a turning operation part for turning the turning body is unoperated, the turning body is braked using the turning brake hydraulic motor and the braking operation of a mechanical brake unit for mechanically holding the turning body stationary is released when an operation part for performing an operation other than the turning of the turning body is operated.

Claims

exact text as granted — not AI-modified
1 . A shovel, comprising:
 a turning electric motor configured to drive a turning body to turn; and   a turning brake hydraulic motor mechanically connected to the turning body or the turning electric motor,   wherein in a state where a turning operation part for turning the turning body is unoperated, the turning body is braked using the turning brake hydraulic motor and a braking operation of a mechanical brake unit for mechanically holding the turning body stationary is released when an operation part for performing an operation other than turning of the turning body is operated.   
     
     
         2 . The shovel as claimed in  claim 1 , further comprising:
 a hydraulic circuit configured to disconnect an intake port and a discharge port of the turning brake hydraulic motor.   
     
     
         3 - 4 . (canceled) 
     
     
         5 . The shovel as claimed in  claim 2 , wherein the hydraulic circuit is configured to keep a discharge side of the turning brake hydraulic motor closed, and a connecting and disconnecting device is provided between the turning body and the turning brake hydraulic motor. 
     
     
         6 . The shovel as claimed in  claim 5 , wherein the connecting and disconnecting device is configured to connect the turning brake hydraulic motor to the turning body or the turning electric motor in the state where the turning operation part for turning the turning body is unoperated. 
     
     
         7 . The shovel as claimed in  claim 2 , wherein the hydraulic circuit includes a switching valve and is configured to disconnect the intake port and the discharge port of the turning brake hydraulic motor by the switching valve. 
     
     
         8 . The shovel as claimed in  claim 7 , wherein
 when the turning operation part for turning the turning body is operated, the intake port and the discharge port of the turning brake hydraulic motor are connected by the switching valve to form a closed circuit, and   when the turning operation part for turning the turning body is unoperated, the intake port and the discharge port of the turning brake hydraulic motor are disconnected by the switching valve.   
     
     
         9 . A method of controlling a shovel comprising:
 braking turning body of the shovel using a turning brake hydraulic motor mechanically connected to the turning body or a turning electric motor configured to drive the turning body to turn, and releasing a braking operation of a mechanical brake unit for mechanically holding the turning body stationary when an operation part for performing an operation other than turning of the turning body is operated in a state where a turning operation part for turning the turning body is unoperated.   
     
     
         10 . The method of controlling a shovel as claimed in  claim 9 , further comprising:
 disconnecting an intake port and a discharge port of the turning brake hydraulic motor when the turning body is braked using the turning brake hydraulic motor.   
     
     
         11 . The method of controlling a shovel as claimed in  claim 10 , further comprising:
 keeping a discharge side of the turning brake hydraulic motor closed, and connecting or disconnecting the turning body and the turning brake hydraulic motor by a connecting and disconnecting device.   
     
     
         12 . The method of controlling a shovel as claimed in  claim 11 , further comprising:
 operating the connecting and disconnecting device to connect the turning brake hydraulic motor to the turning body or the turning electric motor in the state where the turning operation part for turning the turning body is unoperated.

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