US-12624522-B2 - Work machine

US12624522B2US 12624522 B2US12624522 B2US 12624522B2US-12624522-B2

Abstract

A work machine includes a battery pack, a first vent provided at a rear end of a machine body, a fan located between the first vent and the battery pack, a second vent located in front of and above the battery pack, and an electric motor rotated by electric power from the battery pack.

Inventors

Jun Terashima

Assignees

Yanmar Holdings Co., Ltd.

Dates

Publication Date: 20260512
Application Date: 20230206
Priority Date: 20220228

Claims (11)

1 . A work machine comprising: a battery pack; a first vent located at a rear end of a machine body; a fan located between the first vent and the battery pack; a second vent located in front of and above the battery pack; a third vent located at a bottom front end of the machine body and below the battery pack, and an electric motor rotated by electric power from the battery pack, wherein the first vent and the second vent are located in a front-rear direction of the work machine with the battery pack in between, and wherein air flows from the third vent laterally and then upward through an upward flow passage formed on a lateral side of the battery pack such that air flows in an upward direction of the work machine.
2 . The work machine according to claim 1 , further comprising the third vent located in front of the battery pack and below the second vent.
3 . The work machine according to claim 2 , wherein the fan is located above the third vent.
4 . The work machine according to claim 1 wherein at least part of the fan is located above the battery pack.
5 . The work machine according to claim 1 , further comprising a heat exchanger to cool down hydraulic oil pumped by a hydraulic pump driven by the electric motor, wherein the heat exchanger is between the battery pack and the fan, and the fan exhausts air inside the machine body to the outside.
6 . The work machine according to claim 5 further comprising a fourth vent located on a side wall of the machine body adjacent to the fan and in front of the fan.
7 . The work machine according to claim 5 further comprising a hydraulic oil tank located below the heat exchanger to store the hydraulic oil.
8 . The work machine according to claim 7 further comprising an electrical equipment located above the electric motor that is coupled to the hydraulic pump, wherein the hydraulic oil tank has a recess that in a lower portion of a side adjacent to the hydraulic pump, and the hydraulic pump is located inside the recess of the hydraulic oil tank.
9 . The work machine according to claim 1 , wherein a plurality of battery packs are spaced apart from each other in a front-rear direction.
10 . A work machine comprising: a battery pack; a first vent located at a back of a hood that defines a part of an engine room accommodating the battery pack; a fan located between the first vent and the battery pack; and a third vent connected to the engine room located in front of the hood and lower than the first vent, wherein the first vent and the third vent are located in a front-rear direction of the work machine with the battery pack in between, and wherein air flows from the third vent laterally and then upward through an upward flow passage formed on a lateral side of the battery pack such that air flows in an upward direction of the work machine.
11 . The work machine according to claim 10 , wherein an air flow that flows from the third vent to the engine room is caused to flow below a floor extending forward from a front lower edge of the hood.

Description

CROSS-REFERENCE This application claims foreign priority of JP2022-028822 filed Feb. 28, 2022, the disclosures of which are hereby incorporated by reference in their entirety. TECHNICAL FIELD The present disclosure relates to a work machine driven by battery power. BACKGROUND ART Electric work machines with a battery box which houses multiple batteries are known (See Patent Document 1). In such electric work machines, a fan for a battery located above the battery box cools down the batteries by causing air flow from the bottom to the top of a space where the multiple batteries are housed. PRIOR ART DOCUMENT Patent Document Patent Document 1: Japanese Patent Laid-open Publication No. 2020-045701 SUMMARY OF INVENTION Technical Problem Generally, such the electric work machine needs to cool not only the battery, but also an electrical equipment such as electric motors and inverters, as well as a hydraulic oil for actuators. Accordingly it is necessary to arrange additional fans for cooling the electrical equipment and the hydraulic oil in addition to the fan for the battery. Especially in small work machines such as super-mini excavators in which a space to install the equipment is limited, it is difficult to place the fan for cooling the electrical equipment and hydraulic oil and the fan for the battery, separately, in addition to the electrical and hydraulic equipment. The present disclosure was made in view of problems of the conventional art mentioned above, and an object is to provide a work machine driven by battery power capable of cooling the equipment generating heat while efficiently arranging the equipment inside the engine room. Solution to Problem To solve the above-mentioned problems, the present disclosure provides a work machine including: a battery pack; a first vent provided at a rear end of a machine body; a fan located between the first vent and the battery pack; a second vent located in front of and above the battery pack; and an electric motor rotated by electric power from the battery pack. According to an embodiment of the present disclosure, the work machine may include a third vent located in front of the battery pack and below the second vent. According to an embodiment of the present disclosure, the third vent may be located below the battery pack. According to an embodiment of the present disclosure, the fan may be located above the third vent. According to an embodiment of the present disclosure, at least part of the fan may be located above the battery pack. According to an embodiment of the present disclosure, the work machine may include a heat exchanger to cool down hydraulic oil pumped by a hydraulic pump driven by the electric motor, the heat exchanger may be located in the rear of the battery pack and in front of the fan, and the fan may exhaust air inside the machine body to the outside. According to an embodiment of the present disclosure, the work machine may include a fourth vent located on a side wall of the machine body adjacent to the fan and in front of the fan. According to an embodiment of the present disclosure, the work machine may include a hydraulic oil tank to store the hydraulic oil and is located below the heat exchanger. According to an embodiment of the present disclosure, the work machine may include an electrical equipment located above the electric motor that is mechanically coupled to the hydraulic pump located inside a lower side recess of the hydraulic oil tank. According to an embodiment of the present disclosure, a plurality of battery packs are spaced apart from each other in a front-rear direction. Advantageous Effects of Invention According to the present disclosure, it is possible to provide a work machine driven by battery power capable of cooling the equipment generating heat while efficiently arranging the equipment inside the engine room. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a left side view illustrating an electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 2 is a rear view illustrating an electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 3 is a front view illustrating an upper revolving body with a driver's seat and a lever stand removed from the electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 4 is a plan view illustrating the upper revolving body of the electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 5 is a left side view illustrating the upper revolving body of the electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 6 is a cross-sectional view taken by line A-A of the upper revolving body of the electric hydraulic excavator according to an embodiment of the present disclosure, FIG. 7 is a cross-sectional view taken by line B-B of the upper revolving body of the electric hydraulic excavator according to an embodiment of the present disclosure, FIG