David Leslie Schulz

US Patent:

48854514, Dec 5, 1989

Filed:

May 9, 1988

Appl. No.:

7/192001

Inventors:

John F. Farrow - Plymouth MI
David W. Schulz - South Lyon MI

Assignee:

Medar, Inc. - Farmington Hills MI

International Classification:

B23K 1124

US Classification:

219110

Abstract:

A method is disclosed for controlling the magnitude of current delivered through welding electrodes to a workpiece to be welded using resistance welding techniques, in order to prevent weld expulsion and concomitant diminishment of weld quality. Weld expulsion is detected by determining changes in resistance during formation of the weld, by periodically determining the power factor, and the primary circuit of the welding transformer. The power factor is determined by determining the relative timing between the commencement of the applied voltage, the zero crossover point of the applied voltage, and the ensuing zero point of the applied current.

US Patent:

20210207705, Jul 8, 2021

Filed:

Jan 6, 2020

Appl. No.:

16/734963

Inventors:

- Detroit MI, US
David S. Schulz - Livonia MI, US
Ronald G. Mattise - Davisburg MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

F16H 57/04
F16H 57/02
F16H 57/029

Abstract:

A system for retaining and redistributing a fluid includes a capture member including a recessed surface defining a reservoir and a sealing surface extending around a perimeter of the recessed surface, the sealing surface including a plurality of fastener openings, a sealing member adjacent to and coupled with the sealing surface of the capture member, the sealing member encircling the plurality of fastener openings, a cover member coupled to the capture member, and at least one fastener coupling the cover member to the capture member. The cover member and the capture member compressively secure the sealing member therebetween to retain the fluid between the cover member and the capture member.

US Patent:

20190170243, Jun 6, 2019

Filed:

Dec 5, 2017

Appl. No.:

15/831951

Inventors:

- DETROIT MI, US
David Schulz - Livonia MI, US
Laurie B. Davenport - Livonia MI, US
Mark A. Smakal - Byron MI, US

International Classification:

F16H 57/04

Abstract:

An exemplary device for distributing gear lubricant in a gear assembly housing of a vehicle includes a gear assembly housing having a sealed interior portion defined by a first housing and an second housing, the sealed interior portion containing a lubricant and enclosing a gear assembly having a gear rotatably mounted in the gear assembly housing that rotates through the lubricant and a reservoir housing secured to an upper portion of the first housing, the reservoir housing defining a reservoir fluidly connected to the sealed interior portion of the gear assembly housing and including an orifice fluidly connected to a gear assembly component, the orifice having a predetermined size for allowing the lubricant to flow to the gear assembly component. As the gear rotates, the gear transfers the lubricant to the reservoir.

US Patent:

20170082186, Mar 23, 2017

Filed:

Sep 22, 2015

Appl. No.:

14/861460

Inventors:

- Detroit MI, US
MUFTAU M. ALABI - ROCHESTER HILLS MI, US
DAVID S. SCHULZ - LIVONIA MI, US
BHAPINDER PURI - TROY MI, US

International Classification:

F16H 48/42
F16H 48/08

Abstract:

An axle housing for an axle assembly of a vehicle includes a pinion portion and a differential portion. The differential portion rotatably supports a differential gear assembly. A pinion insert has a first and second bearing pockets and is disposed in the pinion portion of the axle housing at least partially forming a bore through which a pinion shaft rotates. A first bearing is disposed in the first bearing pocket of the pinion insert and a second bearing is disposed in the second bearing pocket of the pinion insert. The pinion insert is manufactured from a material having a higher stiffness than the cast metal alloy of the axle housing.

US Patent:

20160265647, Sep 15, 2016

Filed:

Mar 13, 2015

Appl. No.:

14/657658

Inventors:

- Detroit MI, US
Muftau M. Alabi - Rochester Hills MI, US
David S. Schulz - Livonia MI, US
Jinsha Li - Rochester Hills MI, US

International Classification:

F16H 57/037
F16H 57/03
F16H 57/021
F16H 57/032

Abstract:

An axle carrier housing includes a center housing defining an internal chamber, a pinion nose extending from the center housing to a housing front end, the pinion nose defining a pinion chamber configured to house a pinion shaft assembly, the housing front end defining a shaft opening having a central axis, and a first axle tube extending from the center housing to a housing first side defining a first axle tube opening having a first axle axis that is generally perpendicular to the central axis. A second axle tube extends from the center housing to a housing second side that is opposite the housing first side, the second axle tube defining a second axle tube opening having a second axle axis that is concentric with the first axle axis. First and second transverse webs extend angularly from the pinion nose and the center housing.