James H Blalock

US Patent:

6497313, Dec 24, 2002

Filed:

Mar 28, 2001

Appl. No.:

09/819577

Inventors:

James H. Blalock - Olive Branch MS

Assignee:

Parker Hannifin Corporation - Cleveland OH

International Classification:

F16D 1106

US Classification:

192 18A

Abstract:

A power take-off unit includes a drag brake assembly that is automatically engaged when a hydraulically actuated clutch assembly is disengaged. The drag brake assembly includes a brake piston that is axially aligned with the output shaft and is urged into frictional engagement therewith by a spring. When pressurized fluid is provided, the clutch assembly is engaged to cause the output shaft to be rotatably driven by the input gear. At the same time, the pressurized fluid causes the brake piston to retract axially within the cylindrical recess against the urging of the spring. As a result, the brake piston is moved out of frictional engagement with the output shaft to permit free rotation of the output shaft. When pressurized fluid is not provided, the clutch assembly is disengaged to prevent the output shaft from being rotatably driven by the input gear. The lack of pressurized fluid in the clutch chamber to allows the spring disposed within the cylindrical recess to urge the brake piston axially into frictional engagement with the output shaft to retard rotation thereof.

US Patent:

7597172, Oct 6, 2009

Filed:

Apr 24, 2006

Appl. No.:

11/379883

Inventors:

Joseph A. Kovach - Aurora OH, US
James H. Blalock - Olive Branch MS, US
Steven C. Rink - Lawton OK, US
Stacy H. Turner - Ft. Wayne IN, US
Hao Zhang - Canfield OH, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

B60K 17/356

US Classification:

180305, 180306

Abstract:

A hydraulic energy recovery and a mechanical drive system in one unit that also provides integral mounting of hydraulic pump/motors for primary drive, secondary drive, and pumps for cooling, lubrication, and low pressure systems along with a mounting position for a power take-off device.

US Patent:

8490739, Jul 23, 2013

Filed:

Oct 5, 2009

Appl. No.:

12/573512

Inventors:

Joseph A. Kovach - Aurora OH, US
James H. Blalock - Olive Branch MS, US
Steven C. Rink - Lawton OK, US
Stacy H. Turner - Ft. Wayne IN, US
Hao Zhang - Canfield OH, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

B60K 17/00

US Classification:

180305, 180307

Abstract:

A hydraulic energy recovery and a mechanical drive system in one unit that also provides integral mounting of hydraulic pump/motors for primary drive, secondary drive, and pumps for cooling, lubrication, and low pressure systems along with a mounting position for a power take-off device.

US Patent:

8505413, Aug 13, 2013

Filed:

Jan 2, 2009

Appl. No.:

12/348089

Inventors:

John M. Loeffler - Olive Branch MS, US
James H. Blalock - Olive Branch MS, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

F16H 47/00

US Classification:

747301, 74574, 60469

Abstract:

A hydraulic power output unit can be used in a hydraulic hybrid drive system for propelling a vehicle. The hydraulic power output unit includes a housing having an input shaft that extends within the housing and is adapted to be rotatably driven by a source of rotational power. A hydraulic pump is rotatably driven by the input driveshaft to pump hydraulic fluid. A vibration damper is provided within the housing for dampening vibrations in the input shaft.

US Patent:

20170072793, Mar 16, 2017

Filed:

May 28, 2015

Appl. No.:

15/308952

Inventors:

- Cleveland OH, US
James Blalock - Olive Branch MS, US

Assignee:

Parker-Hannifin Corporation - Cleveland OH

International Classification:

B60K 17/28
F16D 25/0638
F16H 57/00
F16D 13/52

Abstract:

A power take off unit includes an output gear having a hydraulic circuit. The hydraulic circuit is an internal hydraulic circuit that is in fluid communication with an internal clutch assembly. The hydraulic circuit includes a flow-restrictive passage that modulates the flow of hydraulic fluid in order to provide a soft start clutch engagement that reduces shock loads associated with loads produced when starting torque is applied to the attached equipment.