Hydraulic excavator

• US 9,469,970 B2
• Filed: 02/18/2013
• Issued: 10/18/2016
• Est. Priority Date: 02/18/2013
• Status: Active Grant

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Nakamura, Naoto
• Primary Examiner(s): PHAN, HAU VAN
• Application Number:
  US14/345,440
• Publication Number:
  US 20160002884A1
• Time in Patent Office: 1,338 Days
• US Class Current: 1/1
• CPC Class Codes: B60R 3/00 Arrangements of steps or ladders facilitating access to or on the vehicle, e.g. running-boards construction of steps for railway vehicles B61D23/00 ; ladders E06C
• CPC Class Codes: B62D 33/063 movable from one position into at least one other position, e.g. tiltable, pivotable about a vertical axis, displaceable from one side of the vehicle to the other
• CPC Class Codes: E02F 9/0808 Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures for disposition of specific components, E02F9/0858
• CPC Class Codes: E02F 9/0833 Improving access, e.g. for maintenance, steps for improving driver's access, handrails
• CPC Class Codes: E02F 9/0866 Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
• CPC Class Codes: E02F 9/0883 Tanks, e.g. oil tank, urea tank, fuel tank for vehicles in general B60K15/00
• CPC Class Codes: E02F 9/163 Structures to protect drivers, e.g. cabins, doors for cabins; Falling object protection structure [FOPS]; Roll over protection structure [ROPS] for handrails mounted on cabins E02F9/0833 takes precedence; for vehicles in general B60R21/11, B60R21/13, for fork-lift trucks B66F9/07545
• CPC Class Codes: E02F 9/22 Hydraulic or pneumatic drives for dipper or bucket arm position control E02F3/43, for blade position control for graders E02F3/844; for turntables E02F9/121; for fork-lift trucks B66F9/22
• CPC Class Codes: E02F 9/24 Safety devices , e.g. for preventing overload E02F9/226 takes precedence

Abstract

A hydraulic excavator includes a traveling unit and a revolving unit mounted on the traveling unit. The revolving unit includes a revolving frame as a base, right and left side sections, a cab, a hand rail and a grip. The right and left side sections are disposed on right and left sides of the revolving unit. The cab is provided at a first of the right and left side sections. The hand rail is provided at a front edge on a second of the right and left side sections. The hand rail extends upward from the front edge toward a rear of the revolving unit. The grip is provided below the hand rail and on a side surface of the revolving frame. The traveling unit includes a track frame, and a step provided on a side surface of the track frame below the hand rail.

Claims

1. A hydraulic excavator comprising:

a traveling unit; and

a revolving unit mounted on the traveling unit, the revolving unit including

a revolving frame as a base

a right side section on a right side in a left and right direction of the revolving unit with respect to a center line of the revolving unit, the center line extending in a forward and backward direction of the revolving unit, and

a left side section on a left side in the left and right direction of the revolving unit with respect to the center line,

a cab provided at a first of the right side section or the left side section,

a hand rail provided at a front edge on a second of the right side section or the left side section, the hand rail extending upward from the front edge toward a rear of the revolving unit, and

a grip provided below the hand rail and on a side surface of the revolving frame, and

the traveling unit including

a track frame,

a step provided on a side surface of the track frame below the hand rail; and

a rear step,

when the revolving unit is positioned such that the forward direction of the revolving unit is identical to the backward direction of the traveling unit, the bottom edge section of the hand rail at the front edge is positioned in front of a middle of the rear step along the forward and backward direction of the revolving unit, and the grip is positioned behind the middle of the rear step along the forward and backward direction of the revolving unit,

the grip being formed in a U-shape and extending in the vertical direction, a bottom end portion of the grip extending toward the revolving frame, and

a tip end of the bottom end portion of the grip being separated from the revolving frame.

2. The hydraulic excavator according to claim 1, wherein

the step is a front step, and

when the revolving unit is positioned such that the forward direction of the revolving unit is identical to the forward direction of the traveling unit, the bottom edge section of the hand rail at the front edge is positioned in front of the middle of the front step along the forward and backward direction of the revolving unit, and the grip is positioned behind the middle of the front step along the forward and backward direction of the revolving unit.

3. The hydraulic excavator according to claim 2, wherein

the revolving unit further includes

a first deck guard provided on the side surface of the revolving frame where the grip is positioned, and

a second deck guard arranged on an extension line of the first deck guard, and

the grip is arranged on the side surface of the revolving frame between the first deck guard and the second deck guard.

4. The hydraulic excavator according to claim 1, wherein

the revolving unit further includes

a first deck guard provided on the side surface of the revolving frame where the grip is positioned, and

a second deck guard arranged on an extension line of the first deck guard, and

the grip is arranged on the side surface of the revolving frame between the first deck guard and the second deck guard.

5. The hydraulic excavator according to claim 2, wherein

a bottom edge of the grip is positioned above a bottom side on the side surface of the revolving frame.

6. The hydraulic excavator according to claim 5, wherein

the revolving unit further includes a mirror provided behind the grip along the forward and backward direction of the revolving unit.

7. The hydraulic excavator according to claim 1, wherein

the revolving unit further includes

an engine,

a selective catalytic reduction apparatus configured to treat exhaust from the engine, and

a reducing agent tank configured to store a reducing agent, and

the reducing agent tank is arranged at a side section of the second of the right side section or the left side section where the hand rail is provided.

8. The hydraulic excavator according to claim 1, wherein

the cab is arranged at the left side section, and

the hand rail is arranged at the right side section.