US 11,761,157 B2Granted

Self-propelled construction machine

AssigneeWirtgen GmbH

InventorsChristian Berning, Sebastian Drumm

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Abstract

A road milling machine includes a machine frame, at least three travelling devices, a milling drum, and at least one hydraulic drive system. The hydraulic drive system includes at least one hydraulic pump, at least one hydraulic fixed displacement motor for driving at least one driven travelling device, and one each hydraulic variable displacement motor for driving the remaining travelling devices. A first gearbox is arranged between the fixed displacement hydraulic motor and its associated travelling device. One each second gearbox is arranged between each of the hydraulic variable displacement motors and their associated travelling devices. The transmission ratio of the first gearbox is lower than the transmission ratios of the second gearboxes and/or the displacement volume of the fixed displacement motor is smaller than the maximum displacement volume of the variable displacement motors.

Claims20

Dependent claims

A self-propelled construction machine, comprising:

a machine frame including a cut-out in one side of the machine frame;
at least first, second and third traveling devices configured to support the machine frame from a ground surface, the first traveling device being a pivotable first traveling device configured to be pivotable relative to the machine frame about at least one vertical pivoting axis between a pivoted-in position wherein the first traveling device is received in the cut-out of the machine frame and at least one pivoted-out position wherein the first traveling device is located beyond the one side of the machine frame;
at least one working device supported from the machine frame for working the ground surface;
at least one hydraulic drive system configured to drive at least the first and second traveling devices, the hydraulic drive system including:
at least one hydraulic pump;
a first hydraulic motor for driving the first traveling device;
a second hydraulic motor for driving the second traveling device;
a first gearbox arranged between the first hydraulic motor and the first traveling device;
a second gearbox arranged between the second hydraulic motor and the second traveling device;
wherein:
(a) a transmission ratio of the first gearbox is lower than a transmission ratio of the second gearbox;
and/or
(b) a displacement volume of the first hydraulic motor is smaller than a maximum displacement volume of the second hydraulic motor.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/073,005Filed 1 Dec 2022 · continuation
Priority: DE 10 2020 204 383.33 Apr 2020
Published: US 2023/0160158 A125 May 2023
Granted: 19 Sep 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

E01C 23/088
Using power-driven tools, e.g. vibratory tools: rotary tools, e.g. milling drums
B28D 1/18
Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor: by milling,…
B60K 17/356
For driving both front and rear wheels, e.g. four wheel drive vehicles: having fluid or electric motor, for driving one or more wheels
F16H 47/04
The fluid gearing being of the volumetric type: the mechanical gearing being of the type with members having orbital motion

Family

Application17/211,117Parent of this continuation · filed 24 Mar 2021
US 2023/0160158 A1Pre-grant publication · published 25 May 2023
US 11,519,140 B2Parent of this continuation
US 2021/0310203 A1Published application
US 11,761,157 B2This patent

From the US filing history. Foreign family members aren’t listed.