Eric S Jacobson

US Patent:

7578362, Aug 25, 2009

Filed:

Mar 6, 2007

Appl. No.:

11/682582

Inventors:

Frederic W. Pollman - Eden Prairie IA, US
Michael A. Olinger - Ames IA, US
Eric R. Jacobson - Ankeny IA, US

Assignee:

Sauer-Danfoss Inc. - Ames IA

International Classification:

B62D 11/00
B60K 17/14

US Classification:

180 648, 180308

Abstract:

A vehicle having a frame with an engine mounted thereon. The engine has an output shaft that is connected to the input shaft of at least one hydromechanical transmission with a drive belt. A second hydromechanical transmission can then be used in association with the engine, first hydromechanical transmission and drive belt in order to provide an output to actuate driving elements in order to drive the vehicle.

US Patent:

7892130, Feb 22, 2011

Filed:

Dec 4, 2007

Appl. No.:

11/950148

Inventors:

Wilhelm Gollner - Neumunster, DE
Eric R. Jacobson - Ankeny IA, US

Assignee:

Sauer-Dafoss Inc. - Ames IA

International Classification:

F16H 47/04

US Classification:

475 73, 475 80

Abstract:

A power split transmission concept for two or three or four modes is provided with two variable hydrostatic units, an engine mechanically connected to the row sun of a planetary gear set with at least two planetary rows, the second row of the planetary rows being connected to a row sun, whereby both hydrostatic units stay connected with the same planetary element through all modes, one hydrostatic unit being connected to the sun of row and the other hydrostatic unit being connected to a ring gear of planetary row.

US Patent:

20180291797, Oct 11, 2018

Filed:

Apr 6, 2018

Appl. No.:

15/946880

Inventors:

- Ames IA, US
Nicholas Creager - Ames IA, US
Matt Dorenkamp - Huxley IA, US
Eric R. Jacobson - Ankeny IA, US

International Classification:

F01P 7/04
F16H 61/4148
F04B 49/00

Abstract:

A hydraulic system that has a hydraulic pump connected to and in communication with a hydraulic motor, at least one hydraulic cylinder, or both by a first conduit and a second conduit (i.e., a high side and a low side). The hydraulic system has a bypass valve connected to and in communication with the first conduit and the second conduit. The bypass valve has a preset pressure that is above a minimum low side pressure. When a shock load occurs in the hydraulic system and a related drop in pressure on the low side occurs, the bypass valve opens when the preset pressure is passed thereby preventing the pressure from dropping to the minimum low side pressure. The hydraulic system thereby avoids a low loop event that could cause damage to the hydraulic system without the presence of larger charge pumps or accumulators.