EP-4737162-A1 - ELECTRIC DUMP TRUCK

Abstract

The vehicle body frame (2) consists of a left frame (2A) and a right frame (2B) extending in the longitudinal direction, a left pillar (2C) extending upwards from the left frame (2A), a right pillar (2D) extending upwards from the right frame (2B), and a beam (2E) extending in the lateral direction and attached across the upper parts of the left pillar (2C) and the right pillar (2D). The battery device (11) is arranged between the left pillar (2C) and the right pillar (2D) with a plurality of battery modules (12). In the plurality of battery modules (12), one end side in the longitudinal direction becomes the electrical wiring connection part (12A) for connecting electrical wirings (15), and the other end side in the longitudinal direction becomes the temperature control liquid pipe connection part (12B) for connecting temperature control liquid pipes (16).

Inventors

• KANAYA, Yosuke
• KANEZAWA, HIROSHI
• IKEDA, JUN
• NAKATE, YOHEI
• SAIJO, Kimihiro
• KIMURA, TAKUYA
• ABE, YUSUKE
• LI, ZHI
• SUZUKI, SHOTARO

Assignees

• Hitachi Construction Machinery Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240917

Claims (5)

1. An electric dump truck comprising: a battery device mounted on a vehicle body frame and including a plurality of battery modules arranged in the battery device, wherein the vehicle body frame includes: left and right frames extending in a longitudinal direction; left and right pillars extending upward from the left and right frames; and a beam extending in a lateral direction and attached across a top of the left and right pillars, the battery device is arranged such that the plurality of battery modules are positioned between the left and right pillars, the plurality of battery modules have one longitudinal end serving as an electrical wiring connection part for connecting electrical wiring, and the other longitudinal end serving as a temperature control liquid pipe connection part for connecting liquid pipes for temperature control.
2. The electric dump truck according to claim 1, wherein a junction box is installed on the electrical wiring connection part side of the battery module; a plurality of electrical wirings extending from the electrical wiring connection part of the battery module are connected to the junction box, bundled, and then installed between the battery device and the beam.
3. The electric dump truck according to claim 2, wherein the battery device is arranged such that the battery modules extending in the lateral direction are aligned in multiple rows in the longitudinal direction and in multiple stacks in the vertical direction; the top stack battery modules are arranged only on the front side from the middle part in the longitudinal direction; the electrical wiring is installed between the second stack battery module, which is positioned one stack lower on the rear side, and the beam.
4. The electric dump truck according to claim 1, further comprising a battery cover that covers the upper side of the battery device.
5. The electric dump truck according to claim 2, further comprising a box cover that covers the upper side of the junction box.

Description

TECHNICAL FIELD The present invention relates to an electric dump truck suitably used for transporting crushed stones and the like mined in, for example, a mine. BACKGROUND ART For the task of transporting crushed stones and the like mined in a mine, ultra-large dump trucks called mining dump trucks are used. This ultra-large dump truck is configured to include a vehicle body frame that extends in the longitudinal direction to form a support structure, left and right front wheels and left and right rear wheels attached to the vehicle body frame, and a load-carrying platform installed on the vehicle body frame for loading crushed stones and the like. The ultra-large dump truck is configured as an electric dump truck that drives an electric motor with electric power obtained by driving a generator with an engine. Additionally, some electric dump trucks are equipped with a battery device that stores surplus electric power. This electric dump truck can drive the electric motor with the power stored in the battery device (Patent document 1). PRIOR ART DOCUMENT PATENT DOCUMENT Patent document 1: JP 2018-188144 A SUMMARY OF THE INVENTION Here, the performance of the electric dump truck is greatly influenced by the capacity of the battery device. especially, an electric dump truck not equipped with an engine for power generation can extend its operating time by efficiently mounting a large battery device on the vehicle body frame. Patent document 1 does not describe replacing the engine with a battery, that is, mounting a battery without mounting an engine. Additionally, some battery devices are equipped with a structure for circulating a liquid (coolant, heating liquid) to adjust to a suitable temperature (temperature with good charging efficiency) . For this reason, if the location for loading, as well as the positions of wiring and piping, are not considered, the wiring and piping can become obstructions, preventing the installation of a battery device with sufficient capacity. This also presents a problem of reduced operating time. The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to provide an electric dump truck that can extend its operating time by mounting a battery device with sufficient capacity on the vehicle body frame. In the electric dump truck of the present invention comprises a battery device mounted on a vehicle body frame and including a plurality of battery modules arranged in the battery device. The vehicle body frame includes: left and right frames extending in a longitudinal direction; left and right pillars extending upward from the left and right frames; and a beam extending in a lateral direction and attached across a top of the left and right pillars. The battery device is arranged such that the plurality of battery modules are positioned between the left and right pillars. The plurality of battery modules have one longitudinal end serving as an electrical wiring connection part for connecting electrical wiring, and the other longitudinal end serving as a temperature control liquid pipe connection part for connecting temperature control liquid pipe. According to the present invention, the electric dump truck can mount a battery device with sufficient capacity on the vehicle body frame, thereby extending its operating time. BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] is a left side view showing an electric dump truck according to an embodiment of the present invention.[FIG. 2] is a left side view showing the vehicle body frame, cab, and battery device.[FIG. 3] is a right side view showing the vehicle body frame, cab, and battery device.[FIG. 4] is a front view showing the vehicle body frame, cab, and battery device.[FIG. 5] is a plan view showing the vehicle body frame, cab, and battery device.[FIG. 6] is a perspective view showing the battery device, junction box, etc.[FIG. 7] is a perspective view showing the junction box, etc., with the box cover removed. MODE FOR CARRYING OUT THE INVENTION Hereinafter, the electric dump truck according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7. The electric dump truck is equipped with a battery device that stores electric power for driving the travel electric motor. In this battery device, for example, electric power drawn from an overhead wire using a current collector is charged (trolley system). In FIG. 1, the electric dump truck 1 is an ultra-large dump truck for transporting crushed stones and the like mined in a mine. Here, the electric dump truck 1 is configured to include a vehicle body frame 2, front wheels 3, rear wheels 4, a load-carrying platform 6, a hoist cylinder 7, a cab 10, a battery device 11, electrical wiring 15, and temperature control liquid pipe 16, as described later. The vehicle body frame 2 forms the main skeleton of the electric dump truck 1. The vehicle body frame 2 is a robust suppo