# US 2008/0188349 A1 · PTO brake > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0188349 A1 - Document ID: US20080188349A1 - Status: Published application - Kind: A1 - Application number: 11/701,582 - Filed: 2007-02-02 - Published: 2008-08-07 - Earliest claimed: 2007-02-02 - Assignees: Eaton Corporation - Inventors: Mike Romine - Web page: https://patentgrep.com/patent/US20080188349A1 ## CPC - B60K 17/28: characterised by arrangement, location, or type of power take-off - B60K 25/00: Auxiliary drives (arrangement of tyre-inflating pumps mounted on vehicles B60C23/10) - F16H 3/095: with means for ensuring an even distribution of torque between the countershafts - F16H 37/043: {without gears having orbital motion} - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F16H: GEARING ## Abstract An embodiment includes a method of engaging a PTO with a drivetrain includes detecting a value representative of the speed of a PTO output gear, and detecting a value representative of the speed of a PTO input gear. The method further includes reducing the speed of one of the PTO output gear and the PTO input gear, and engaging the PTO input gear with the PTO output gear without the use of a clutch to synchronize the speed of the PTO input gear with the PTO output gear. ## Claims ### Claim 1 A powertrain system comprising: a multispeed transmission defining a plurality of speed ratios; a power take off (PTO) having a PTO input member selectively rotationally engaged with a PTO output member; an inertia brake for reducing the speed of the PTO input member; and a controller in communication with the detection system and having an output for actuating the inertia brake and an output for engaging the PTO input member with the PTO output member, wherein the inertia brake selectively reduces the rotational speed of a transmission component for engaging the PTO input member with the PTO output member. ### Claim 2 (depends on 1) The system of claim 1, wherein the inertia brake selectively reduces the rotational speed of a transmission rotational component for shifting the transmission into a speed ratio. ### Claim 3 (depends on 1) The system of claim 1, wherein the detection system detects a value representative of a relative speed between the PTO input member and the PTO output member. ### Claim 4 (depends on 1) The system of claim 1, wherein the PTO input member has teeth that are selectively engaged with teeth of the PTO output member. ### Claim 5 (depends on 4) The system of claim 4, wherein engagement of the PTO input member with the PTO output member includes engaging the PTO input member teeth with the PTO output member teeth. ### Claim 6 (depends on 1) The system of claim 1, further comprising a shifting system for the multispeed transmission, wherein the shifting system selectively reduces the speed of a transmission rotational component using the inertia brake to engage a transmission speed ratio. ### Claim 7 (depends on 1) The system of claim 1, further comprising a detection system for detecting a value representative of a speed of the PTO output member. ### Claim 8 A method of operating a drivetrain system, the drivetrain including a PTO and a transmission having multiple speed ratios and an inertia brake, the PTO including a PTO output member engageable with a PTO input member, the method comprising: reducing the speed of one of the PTO output member and the PTO input member with an inertia brake; and engaging the PTO input member with the PTO output member without the use of a friction clutch to synchronize the speed of the PTO input member with the PTO output member. ### Claim 9 (depends on 8) The method of claim 8, further comprising monitoring a speed value representative of a rotational speed of a PTO component. ### Claim 10 (depends on 8) The method of claim 8, further comprising detecting whether the PTO is engaged for rotation with the drivetrain. ### Claim 11 (depends on 8) The method of claim 8, wherein reducing includes stopping, at least momentarily, the rotation one of the PTO output member and the PTO input member. ### Claim 12 (depends on 11) The method of claim 11, further comprising verifying that the PTO output member speed is within a desired shifting range. ### Claim 13 (depends on 11) The method of claim 11, wherein re-engaging includes reducing the speed of one of the PTO output member and the PTO input member with the inertia brake. ### Claim 14 (depends on 13) The method of claim 13, wherein reducing is performed without contacting a rotational portion of the PTO output member with a rotational portion of the PTO input member. ### Claim 15 A method of operating a drivetrain, the drivetrain including a multispeed transmission, an engine, and a main clutch operably interposed between the engine and the transmission, the method comprising: detecting a value representative of the speed of a PTO output member; detecting a value representative of the speed of a PTO input member; reducing the speed of one of the PTO output member and the PTO input member with an inertia brake; and engaging the PTO input member with the PTO output member without the use of a friction clutch to synchronize the speed of the PTO input member with the PTO output member. ### Claim 16 (depends on 15) The method of claim 15, further comprising verifying that the PTO output member speed is within a desired shifting range. ### Claim 17 (depends on 15) The method of claim 15, wherein reducing the speed of one of the PTO output member and the PTO input member is performed without contacting a rotational portion of the PTO output member with a rotational portion of the PTO input member. ### Claim 18 (depends on 15) The method of claim 15, further comprising reducing the speed of a transmission rotational component with the inertia brake for engaging a speed ratio of the transmission. ### Claim 19 (depends on 19) The method of claim 19, wherein reducing the speed of a transmission rotational component with the inertia does not involve stopping the rotation of the transmission rotational component. ### Claim 20 (depends on 15) The method of claim 15, wherein reducing includes stopping one of the PTO output member and the PTO input member.