Construction machine with cab noise reduction device
First Claim
1. A construction machine, comprising:
- a lower propelling body;
an upper slewing body including an upper frame and slewably mounted on the lower propelling body;
a cab including a floor plate and being installed on the upper frame;
and a cab noise reduction device, the cab noise reduction device comprising;
the floor plate;
an under-cab member including a cab deck supporting the cab and being provided under the cab to define a closed-form under-cab space whose periphery is substantially closed, in cooperation with the floor plate; and
a Helmholtz resonator provided in the under-cab space to reduce noise intruding into the under-cab space by a resonance effect,wherein the resonator includes;
a hollow body portion having a sidewall; and
an opening provided in the sidewall of the body portion and being uncovered when the cab is installed on the upper frame, to let an internal space of the body portion and the under-cab space outside the body portion communicate with each other through the opening.
1 Assignment
0 Petitions
Accused Products
Abstract
A construction machine capable of effectively reducing noise which would intrude into a cab, without deterioration in ride quality, comfort and air-conditioning efficiency in the cab is provided. The construction machine includes a lower propelling body, an upper slewing body including an upper frame, a cab including a floor plate and installed on the upper frame, and a cab noise reduction device. The cab noise reduction device includes: the floor plate; an under-cab member including a cab deck supporting the cab and provided under the cab to define a closed-form under-cab space whose periphery is substantially closed, in cooperation with the floor plate; and a resonator reducing noise in the under-cab space by a resonance effect.
14 Citations
9 Claims
-
1. A construction machine, comprising:
-
a lower propelling body; an upper slewing body including an upper frame and slewably mounted on the lower propelling body; a cab including a floor plate and being installed on the upper frame; and a cab noise reduction device, the cab noise reduction device comprising; the floor plate; an under-cab member including a cab deck supporting the cab and being provided under the cab to define a closed-form under-cab space whose periphery is substantially closed, in cooperation with the floor plate; and a Helmholtz resonator provided in the under-cab space to reduce noise intruding into the under-cab space by a resonance effect, wherein the resonator includes; a hollow body portion having a sidewall; and an opening provided in the sidewall of the body portion and being uncovered when the cab is installed on the upper frame, to let an internal space of the body portion and the under-cab space outside the body portion communicate with each other through the opening. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A construction machine, comprising:
-
a lower propelling body; an upper slewing body including an upper frame and slewably mounted on the lower propelling body; a cab including a floor plate and being installed on the upper frame; and a cab noise reduction device, the cab noise reduction device comprising; the floor plate; an under-cab member including a cab deck supporting the cab and being provided under the cab to define a closed-form under-cab space whose periphery is substantially closed, in cooperation with the floor plate; and a resonator provided in the under-cab space to reduce noise intruding into the under-cab space by a resonance effect, wherein the resonator includes; a hollow body portion having a sidewall; and an opening provided in the sidewall of the body portion to let an internal space of the body portion and the under-cab space outside the body portion communicate with each other through the opening, wherein the resonator is disposed so as to locate the opening thereof in at least one of a plurality of positions corresponding to respective anti-nodes of a sound pressure at resonance in the under-cab space. - View Dependent Claims (7, 8, 9)
-
Specification