Device arrangement structure for hybrid construction equipment

• US 20040098983A1
• Filed: 11/06/2003
• Published: 05/27/2004
• Est. Priority Date: 11/21/2002
• Status: Active Grant

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Inoue, Hiroyuki, Ohtsukasa, Naritoshi, Naruse, Masami
• Granted Patent: US 6,922,990 B2
• Time in Patent Office: Days
• US Class Current: 60/428
• CPC Class Codes: B60L 2200/40 Working vehicles
• CPC Class Codes: B60L 50/15 with additional electric power supply with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61
• CPC Class Codes: E02F 3/325 Backhoes of the miniature type
• CPC Class Codes: E02F 9/0866 Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
• CPC Class Codes: E02F 9/2075 of the hybrid type for vehicles in general B60W20/00
• CPC Class Codes: E02F 9/2217 with energy recovery arrangements, e.g. using accumulators, flywheels
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

A device arrangement structure for hybrid construction equipment capable of reducing devices of a charging system in size is provided. For this purpose, in the device arrangement structure: a hydraulic pump (47) is connected to an engine (41) via a first power take-off (46); and a regenerative motor (59), which is regenerated by return oil from hydraulic actuators (10a, 10b), and a generator motor (55), which assists an engine as an electric motor to drive hydraulic pump and generates power with surplus torque of the regenerative motor, are provided in parallel with the hydraulic pump via the first power take-off.

Claims

1. A device arrangement structure for hybrid construction equipment in which a hydraulic pump is driven with use of an engine and a generator motor in combination, and an inflow of discharge oil of said hydraulic pump to hydraulic actuators is controlled to drive at least one working machine,

wherein said hydraulic pump is connected to said engine via a first power take-off;

and

wherein i) a regenerative motor which is driven by return oil from said hydraulic actuators and regenerates inertia energy or potential energy of said working machine to drive said hydraulic pump, ii) said generator motor, which is driven as a generator with surplus torque when regeneration torque of said regenerative motor is larger than driving torque of said hydraulic pump, and is driven as an electric motor to assist with drive of said hydraulic pump, are provided in parallel with said hydraulic pump via said first power take-off.

2. A device arrangement structure for hybrid construction equipment in which a hydraulic pump is driven with use of an engine and a generator motor in combination, and an inflow of discharge oil of said hydraulic pump to hydraulic actuators is controlled to drive at least one working machine, comprising:

devices of a high pressure hydraulic system including i) said hydraulic pump connected to said engine via a first power take-off, ii) a hydraulic valve for controlling an inflow of discharge oil to said hydraulic actuators, iii) a regenerative motor which is connected to said hydraulic pump via said first power take-off, driven by return oil from said hydraulic actuators, and regenerates inertia energy or potential energy of said working machine to drive said hydraulic pump, and iv) a working fluid tank for draining the return oil from said hydraulic actuators via said regenerative motor,

wherein devices of a charging system including a) said generator motor which is driven as a generator with surplus torque when regeneration torque of said regenerative motor is larger than driving torque of said hydraulic pump, and is driven as an electric motor to assist with drive of said hydraulic pump, b) a capacitor device which is charged with generation electric power of said generator motor as the generator, and supplies driving electric power as the electric motor, and c) an inverter which controls charge of said generator motor into said capacitor device, and drive of said generator motor as the electric motor, are placed separately from said devices of the high pressure hydraulic system.

3. The device arrangement structure for the hybrid construction equipment according to claim 2,

wherein said inverter is placed at an upstream side of a fan driven by said engine;

and

wherein said generator motor is connected to said engine, at a side near to said inverter.

4. The device arrangement structure for the hybrid construction equipment according to claim 2,

wherein said inverter is placed at an upstream side of a suction type fan driven by said engine;

and

wherein said generator motor is connected to said engine via a second power take-off provided at said engine, at a side near to said fan.