Hybrid working machine

• US 8,844,660 B2
• Filed: 12/06/2011
• Issued: 09/30/2014
• Est. Priority Date: 12/09/2010
• Status: Active Grant

• Current Assignee: Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited
• Inventors: Kawashima, Koji, Yanagisawa, Makoto
• Primary Examiner(s): Walters, John
• Assistant Examiner(s): SWENSON, BRIAN L
• Application Number:
  US13/311,709
• Publication Number:
  US 20120144819A1
• Time in Patent Office: 1,029 Days
• Field of Search: 180/65.21, 180/65.265, 180/65.285, 180/65.29, 180/65.31, 180/305, 180/306, 180/308, 903/903, 903/930, 320/137, 320/138, 320/162
• US Class Current: 180/65.29
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: B60Y 2400/114 Super-capacities
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2091 Control of energy storage means for electrical energy, e.g. battery or capacitors energy recovery arrangements in hydraulic or pneumatic drives E02F9/2217
• CPC Class Codes: E02F 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• CPC Class Codes: F16H 61/4043 Control of a bypass valve
• CPC Class Codes: F16H 61/4148 Open loop circuits
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A hybrid working machine includes an engine, an assist motor configured to assist the engine, a hydraulic pump driven by the engine, an electric power accumulating unit configured to feed the assist motor with electric power, an electric-discharge electric motor configured to perform power running with electric power of an electric power accumulator of the electric power accumulating unit, an electric-discharge hydraulic motor connected to the electric-discharge electric motor, and a hydraulic circuit configured to control driving of the electric-discharge hydraulic motor. The hydraulic circuit includes a circulation circuit configured to be connected to a hydraulic feed port and a hydraulic discharge port of the electric-discharge hydraulic motor and a selector valve configured to perform such switching as to connect the electric-discharge hydraulic motor to the circulation circuit at a time of performing an electric discharge operation.

Claims

1. A hybrid working machine, comprising:

an engine;

an assist motor configured to assist the engine;

a hydraulic pump driven by the engine;

an electric power accumulating unit configured to feed the assist motor with electric power;

an electric-discharge electric motor configured to perform power running with electric power of an electric power accumulator of the electric power accumulating unit;

an electric-discharge hydraulic motor connected to the electric-discharge electric motor; and

a hydraulic circuit configured to control driving of the electric-discharge hydraulic motor,

the hydraulic circuit including

a circulation circuit configured to be connected to a hydraulic feed port and a hydraulic discharge port of the electric-discharge hydraulic motor; and

a selector valve configured to perform such switching as to connect the electric-discharge hydraulic motor to the circulation circuit at a time of performing an electric discharge operation.

2. The hybrid working machine as claimed in claim 1, wherein the electric-discharge electric motor is configured to perform power running in accordance with an operation of the selector valve.

3. The hybrid working machine as claimed in claim 2, wherein the electric-discharge electric motor is configured to perform the power running at an end of an operation of the hybrid working machine.

4. The hybrid working machine as claimed in claim 3, wherein the assist motor is configured to perform power running to consume the electric power from the electric power accumulating unit during idle running of the engine.

5. The hybrid working machine as claimed in claim 3, wherein the electric-discharge electric motor is configured to perform the power running to consume the electric power from the electric power accumulator of the electric power accumulating unit during idle running of the engine.

6. The hybrid working machine as claimed in claim 1, wherein

the electric-discharge hydraulic motor is a boom regeneration hydraulic motor, and

the electric-discharge electric motor is a boom regeneration motor generator mechanically connected to the boom regeneration hydraulic motor.

7. The hybrid working machine as claimed in claim 1, wherein

the electric-discharge hydraulic motor is a turning regeneration hydraulic motor, and

the electric-discharge electric motor is a turning regeneration motor generator mechanically connected to the turning regeneration hydraulic motor.