Pontiac Coil, Inc.

Liberty Controls, Inc.

Robert J Rudisil

Tam Nguyen

Jim D Miller

A brake-transmission shift interlock device for an automatic transmission system includes a solenoid secured to a support member that positions the solenoid so as to block movement of a transmission member to prevent a transmission shifter from being moved from a park position. The solenoid includes a plunger having first and second portions and . The second plunger portion engages the transmission member laterally on a side wall if the brake pedal is not depressed and the shifter is in the park position. To prevent the plunger from binding, the second plunger portion is allowed to axially offset from the first plunger portion thereby reducing the required lineal force to move the plunger from a first to a second position when the solenoid is energized.

Brake-transmission shift interlock device for an automatic transmission system

A brake-transmission shift interlock device 10 for an automatic transmission system includes a solenoid 14 secured to a support member 12 that positions the solenoid 14 so as to block movement of a transmission member 176 to prevent a transmission shifter from being moved from a park position. The solenoid 14 includes a plunger 50 having first and second portions 76 and 78. The second plunger portion 78 engages the transmission member 176 laterally on a side wall 94 if the brake pedal is not depressed and the shifter is in the park position. To prevent the plunger 50 from binding, the second plunger portion 78 is allowed to axially offset from the first plunger portion 76 thereby reducing the required lineal force to move the plunger 50 from a first to a second position when the solenoid 14 is energized.

Brake-transmission shift interlock device for an automatic transmission

A straight fluid flow solenoid valve 10 comprising a conduit 24 having an inlet 148, an outlet 146 and a seat 88 member therein with an aperture 90 therethrough; a plunger 68, backstop 76 and spring 70 positioned inside the conduit 24 such that when a voltage is impressed upon a coil 22 circumferentially positioned around the exterior of the conduit 24, the plunger 68 is moved from a closed position to an open position thereby allowing a fluid to pass through the solenoid valve 10 in a substantially laminar flow stream while engaging the plunger 68 and the backstop 76.

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Plainfield, IL, United States of America

Robert J Rudisil