US 2013/0075170 A1Published application

Electric working vehicle

AssigneeHitachi Construction Machinery Co., Ltd.

InventorsToshikazu Minoshima, Kichio Nakajima

Life of this patent

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Abstract

Wheel drive motors (8) constituted of electric motors for driving rear wheels (7) are provided on a vehicle body (2) of a dump truck (1). Each wheel drive motor (8) is connected to a main power generator (12) through a bidirectional converter (20) and the like and driven by power supplied from the main power generator (12). A resistor (21) that consumes regenerative power from each wheel drive motor (8) is connected to the bidirectional converter (20). Cooling air is supplied to the resistor (21) from a blower (24). Operations of a switch (23) of the resistor (21) and the blower (24) are controlled by a controller (28). A mode selecting switch (29) for selecting a heating mode (A), a blowing mode (B), and a heating and blowing mode (C) is connected to the controller (28).

Claims5

Dependent claims

An electric working vehicle comprising:

a traveling drive electric motor provided to a vehicle body;
a bidirectional converter that is provided to said vehicle body, converts direct current power from a direct current power supply into alternating current power having a variable frequency to drive said electric motor and converts output of alternating current power from said electric motor into direct current power;
a resistor that is provided to said vehicle body and connected to said bidirectional converter so as to consume electro motive force regenerated by said electric motor;
a blower that supplies cooling air to said resistor;
and
a mode selecting switch;
wherein said mode selecting switch is configured to select any one mode from a heating mode for performing heat generation in said resistor, a blowing mode for blowing air to said resistor by using said blower, and a heating and blowing mode for simultaneously performing the heat generation using said resistor and the air blow using said blower.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/503,687Filed 19 May 2011
Priority: JP 2010-16064515 Jul 2010
Published: 28 Mar 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

B60K 11/00
Arrangement in connection with cooling of propulsion units
B60K 1/00
Arrangement or mounting of electrical propulsion units
B60L 7/06
Dynamic electric resistor braking: for vehicles propelled by AC motors
B60L 7/22
Electrodynamic brake systems for vehicles in general: dynamic electric resistor braking, combined with dynamic electric regenerative braking