Shovel

Patent metadata

Field	Value
Publication number	US-9725009-B2
Application number	US-201514629116-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	Feb 24, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An electric motor is mounted on a body. The electric motor is driven by an electric driving unit. The electric driving unit is supported to the body by a vibration-proofing member. A natural frequency of a spring-mass system including the vibration-proofing member and the electric driving unit is higher than a frequency of a main component in vibration generated in the body during an operation.

First claim

What is claimed is:

1. A shovel comprising:
a body;
an electric unit; and
a vibration-proofing member which su orts the electric unit to the body,
wherein a natural frequency of a spring-mass system which is determined by a spring constant of the vibration-proofing member and mass of the electric unit is higher than a frequency of a main component in vibration generated in the body during an operation, and
wherein the electric unit includes:
a case; and
electric parts which are mounted on an inner portion of the case,
wherein a lowest natural frequency of the electric parts among natural frequencies in various vibration modes of the electric parts is higher than the natural frequency of the spring-mass system including the vibration-proofing member and the electric unit.

2. The shovel according to claim 1 ,
wherein the electric parts include a power storage module which accumulates electric power supplied to an electric motor from an electric power source.

3. The shovel according to claim 2 ,
wherein the power storage module includes a stacked structure in which a plurality of plate-shaped power storage cells and a plurality of heat transfer plates are stacked and a compressive force is applied in a stacking direction by a pressurizing mechanism, and
wherein a bottom plate and an upper plate of the case fix the power storage module to the inside of the case by applying the compressive force in a direction orthogonal to the stacking direction to the stacked structure.

4. The shovel according to claim 3 ,
wherein the natural frequency of the spring-mass system including the vibration-proofing member and the electric unit is within a range of 30 Hz to 80 Hz.

5. The shovel according to claim 3 , wherein the natural frequency of the spring-mass system including the vibration-proofing member and the electric unit is within a range of 30 Hz to 80 Hz applied in three directions orthogonal to one another.

6. The shovel according to claim 2 , further comprising an electric motor which is mounted on the body, the electric motor being driven by the electric unit.

Assignees

• Sumitomo Heavy Industries

Inventors

• Adachi Shuntaro

Classifications

• B60L2240/545

  Temperature · CPC title

• B60L11/1874 Primary

  Operations & Transport · mapped topic

• Y02T10/705

  Cross-Sectional Technologies · mapped topic

• Y02T10/7005

  Cross-Sectional Technologies · mapped topic

• B60L2270/145

  Structure borne vibrations · CPC title