Kendall D Tjepkes

US Patent:

44113455, Oct 25, 1983

Filed:

Jan 23, 1981

Appl. No.:

6/227730

Inventors:

Robert E. Haight - Waterloo IA
Kendall D. Tjepkes - Cedar Falls IA

Assignee:

Deere & Company - Moline IL

International Classification:

F16D 6704
F16D 2500
F15B 1110

US Classification:

192 12C

Abstract:

In an agricultural vehicle in which a power takeoff modulating valve is shifted in response to a control lever so as to pass pressurized hydraulic fluid through a groove in the outer surface thereof between recesses in an adjacent bore wall for application to a power takeoff clutch to cause engagement of the clutch, application of the hydraulic fluid pressure to the clutch is modulated by an arrangement which selectively diverts the pressurized hydraulic fluid away from the clutch and to a sump in accordance with the rate of pressure increase of the hydraulic fluid to prevent excessively rapid engagement of the clutch. The hydraulic fluid is sumped by a trimmer valve having a first end which immediately responds to high fluid pressures by sliding into a position which sumps the conduit supplying hydraulic fluid to the clutch by an amount directly related to the pressure. An opposite second end of the trimmer valve also responds to the pressure of the hydraulic fluid but much more slowly because of a restriction in the conduit coupling the second end to the hydraulic fluid supply conduit. As sufficient hydraulic fluid passes through the restriction so as to equalize the fluid pressure at the opposite ends of the trimmer valve, the trimmer valve is returned to a position in which the sump is cut off and the hydraulic fluid pressure is applied to the power takeoff clutch.

US Patent:

47827149, Nov 8, 1988

Filed:

Apr 14, 1987

Appl. No.:

7/038187

Inventors:

John W. Schletzbaum - Hudson IA
Howard T. Uehle - Cedar Falls IA
David L. Mixdorf - Waterloo IA
Claire E. Rojohn - Denver IA
Kendall D. Tjepkes - Dike IA

Assignee:

Deere & Company - Moline IL

International Classification:

F16H 308
F16H 506

US Classification:

74360

Abstract:

A collar shift type transmission is arranged to provide an increased number of speed changes from a reduced number of gears and shafts. The transmission has a main shaft, an output shaft and two intermediate shafts with a plurality of intermeshing gear sets located about each shaft. Collar shift elements for engaging different gears to provide a multiplicity of speed and range changes are provided only on the main shaft and one intermediate shaft. Arrangement of the gears of each set in pairs maximizes the number of gear changes while minimizing the required number of gears, collar shift elements and control mechanisms. The main shaft preferably is provided with synchronizer clutches and close coupled to the driven portion of a main clutch to minimize the momentum transfer through the synchronizers. A sectional housing for the transmission supports an eccentrically mounted hydraulic pump which can be rotated to a plurality of positions. An additional housing section can be added to hold a planetary gear system between the clutch and a power source to double the number of speeds while still minimizing the momentum transfer across the synchronizer clutches.

US Patent:

50187503, May 28, 1991

Filed:

Jun 2, 1989

Appl. No.:

7/360953

Inventors:

Richard M. Sparks - Cedar Falls IA
Kendall D. Tjepkes - Dike IA

Assignee:

Deere & Company - Moline IL

International Classification:

F16J 1532

US Classification:

277 38

Abstract:

An oil seal arrangement includes a non-rotating oil ring and a rotating guide ring. A flexible oil seal is bonded to the oil ring and sealingly engages the guide ring to retain lube oil in a bearing chamber. A flexible lip seal and a spacer member rotate with the guide ring and slidably engage portions of the oil ring which are exposed to lube oil and spaced apart from the oil seal.