Working machine

Patent metadata

Field	Value
Publication number	US-12460372-B2
Application number	US-202117487768-A
Country	US
Kind code	B2
Filing date	Sep 28, 2021
Priority date	Mar 29, 2019
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A working machine includes a machine body, a traveling device travelably supporting the machine body, a hydraulic driving device to hydraulically drive the traveling device, a floor frame supported on the machine body via a mounting member, a pedal operable to brake the traveling device, the inching valve to change a flow rate of hydraulic fluid supplied to the hydraulic driving device according to operation of the pedal, and a cable operably connecting the pedal to the inching valve. The pedal and the inching valve are attached to the floor frame.

First claim

What is claimed is:

1 . A working machine comprising:
a machine body; a traveling device travelably supporting the machine body; a hydraulic driving device to hydraulically drive the traveling device; a floor frame supported on the machine body via a mounting member; an operator's seat on which an operator sits, a pedal operable to brake the traveling device, an inching valve to change a flow rate of hydraulic fluid supplied to the hydraulic driving device according to operation of the pedal; and a cable operably connecting the pedal to the inching valve, wherein the floor frame:
includes a bottom wall having attached thereto a seat base to which the operator's seat is attached, and a floor part provided forward of the bottom wall and the operator's seat; and
is configured such that the bottom wall is located downward of the floor part;
the floor part includes an inspection opening in a portion of the floor part that is located forward of the seat base, and an openable cover to close the inspection opening; the working machine further comprises:
an attachment bracket fixed directly to an upper surface of a front portion of the bottom wall at a position below the inspection opening and a rear portion of the openable cover; and
a valve bracket attached to the attachment bracket:
the valve bracket includes:
a valve attachment portion to which the inching valve is attached and which is located below the front portion of the bottom wall; and
a bracket attachment portion which extends upward from the valve attachment portion and which includes an upper portion extending through an area forward of the bottom wall to reach an area higher than the bottom wall and being attached to the attachment bracket by one or more bolts;
the inching valve is attached to the valve attachment portion to be attached to the bottom wall such that the inching valve is disposed below the front portion of the bottom wall; and the pedal is attached to the floor frame.

2 . The working machine according to claim 1 , further comprising:
a brake shaft to rotate about an axial center by operation of the pedal; a brake arm to rotate integrally with the brake shaft; a master cylinder to operate by rotation of the brake arm, wherein the cable operably connects the brake arm and the inching valve.

3 . The working machine according to claim 1 , wherein
the inching valve includes
a valve lever operably connected to the cable, and
a valve main body to which the valve lever is attached, and
the valve main body changes the flow rate of hydraulic fluid supplied to the hydraulic driving device according to rotation of the valve lever around a vertical axis by operating the pedal.

4 . The working machine according to claim 3 , further comprising:
a hydraulic pump to deliver the hydraulic fluid; and a hydraulic fluid tank disposed on a lateral side of the inching valve, wherein the valve main body includes
a back surface with a first joint port fluidly connected to a delivery circuit of the hydraulic pump,
a side surface, facing toward the hydraulic fluid tank, with a second joint port fluidly connected to the hydraulic fluid tank, and
an upper surface with an operation shaft operably connected to the valve lever.

5 . The working machine according to claim 1 , further comprising:
a frame member extended upward from a front portion of the floor frame, the pedal being attached to the frame member; a first cable stay fixed to the frame member, one end portion of the cable being attached to the first cable stay; and a second cable stay attached to the valve bracket, the other end portion of the cable being attached to the second cable stay.

Assignees

• Kubota Kk

Inventors

• Takano Yuki
• Aizawa Tsutomu
• Matsushita Tetsuji

Classifications

• E02F3/431

  for bucket-arms, front-end loaders, dumpers or the like · CPC title

• E02F3/384

  the boom being pivotable relative to the frame about a vertical axis · CPC title

• E02F9/2253

  Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission · CPC title

• E02F9/2004

  Control mechanisms, e.g. control levers (control levers per se G05G) · CPC title

• E02F9/0875

  Arrangement of valve arrangements on superstructures (arrangement of hydraulic hoses E02F9/2275 takes precedence; valves per se E02F9/2267) · CPC title