# US 2013/0154339 A1 · Construction Machine Or Agricultural Machine Having A Rotating Work Device And Method For Driving The Rotating Work Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154339 A1 - Document ID: US20130154339A1 - Status: Published application - Kind: A1 - Application number: 13/714,642 - Filed: 2012-12-14 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: BOMAG GmbH - Inventors: Thomas Darscheid; Marco Reuter - Web page: https://patentgrep.com/patent/US20130154339A1 ## CPC - A01B 76/00: Parts, details or accessories of agricultural machines or implements, not provided for in groups A01B51/00 - A01B75/00 - A01B 35/00: Other machines for working soil (A01B37/00, A01B39/00, A01B77/00 take precedence) - A01B 39/085: {the rotating tools being actively driven} - A01B 39/20: Tools; Details - E01C 23/088: Rotary tools, e.g. milling drums {(for forming recesses to receive marking materials E01C23/0946)} - E01C 23/12: for taking-up, tearing-up, or {full-depth} breaking-up paving, {e.g. sett extractor}(adapted to both placing and removing {preformed} paving {elements} E01C19/52) - A01B: SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL (making or covering furrows or holes for sowing, planting or manuring A01C5/00; mowers convertible to soil working apparatus or capable of soil working A01D42/04; mowers combined with soil working implements A01D43/12; soil working for engineering purposes E01, E02, E21) - E01C: CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR (forming roads or like surfaces by compacting or grading snow or ice E01H) ## Abstract A self-propelled or stationary construction machine or agricultural machine is provided having a rotatable work device, in particular, a work device for processing soil surfaces or for chopping material. The machine has a drive device for the work device, the drive device having a first drive source and a switchable coupling unit between the first drive source and the work device for engaging the work device with the first drive source. The drive device is equipped with an additional drive unit, the machine being configured for controlling the drive device to accelerate the work device by means of the additional drive unit to an operating speed which would result during operation of the work device by means of the first drive source. In addition, an associated method for driving a work device of a construction or agricultural machine is disclosed. ## Claims ### Claim 1 A construction machine or agricultural machine (10) comprising: a rotatable work device for processing soil surfaces and/or for chopping material; and a drive device for the work device, the drive device having a first drive source and a switchable coupling unit between the first drive source and the work device for engaging the work device with the first drive source, wherein the drive device has an additional drive unit and the machine is configured for controlling the drive device to accelerate the work device by the additional drive unit to an operating speed which would result during operation of the work device by the first drive source, and that the switchable coupling unit can be switched in a slip-free and form-locking manner. ### Claim 2 (depends on 1) The machine according to claim 1, wherein the coupling unit, which is switchable in a slip-free and form-locking manner, comprises a switchable disconnecting unit for engaging the work device with the first drive source and a decoupling and/or safety element, which is arranged between the first drive source and the disconnecting unit. ### Claim 3 (depends on 1) The machine according to claim 1, wherein a drivetrain for driving the work device comprises a gearing, the first drive source and the additional drive unit both being able to be coupled to the gearing. ### Claim 4 (depends on 1) The machine according to claim 1, wherein the additional drive unit is supplied by the first drive source. ### Claim 5 (depends on 1) The machine according to claim 1, wherein the additional drive unit has a second drive source. ### Claim 6 (depends on 3) The machine according to claim 3, wherein a synchronization unit is arranged in the drivetrain for adapting the speed of the first drive source with respect to the speed of the additional drive unit or the work device, respectively. ### Claim 7 (depends on 1) The machine according to claim 1, further comprising transport units driven by the first drive source. ### Claim 8 A method for driving a rotatable work device, in attached to a construction or agricultural machine, by a first drive source comprising: engaging the work device with the first drive source in a slip-free and form-locking manner such that, before the work device is operated by the first drive source, the work device is accelerated by an additional drive unit to a predetermined operating speed which would result during operation of the work device by engagement with the first drive source. ### Claim 9 (depends on 8) The method according to claim 8, wherein the work device is moved into an idle position before it is engaged with the first drive source. ### Claim 10 (depends on 8) The method according to claim 8, wherein the work device is engaged with a shut-down first drive source before the work device is accelerated to the operating speed by the additional drive unit. ### Claim 11 (depends on 8) The method according to claim 8, wherein the work device is engaged with the first drive source, which is operated at an idle speed. ### Claim 12 (depends on 8) The method according to claim 8, wherein after the work device has been accelerated to the operating speed by the additional drive unit, the additional drive unit is shut down. ### Claim 13 (depends on 8) The method according to claim 8, wherein during the engagement of the work device with the first drive source, with the work device accelerated by the additional drive unit to the predetermined operating speed, a speed synchronization is carried out between the first drive source and a remaining drivetrain of the work device. ### Claim 14 (depends on 3) The machine according to claim 3, wherein the gearing comprises a reduction gearing. ### Claim 15 (depends on 5) The machine according to claim 5, wherein the second drive source comprises an electric motor.