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A parking pawl is a device fitted to a
"Dynamic Analysis of an Automatic Transmission Parking Mechanism"
University of Adelaide, Australia.
Automatic transmission parking pawl for the 2004 Subaru Impreza
Design Requirements for Parking Pawl
Video of Parking Pawl in an automatic transmission
{{DEFAULTSORT:Parking pawl Automotive transmission technologies Vehicle braking technologies
A parking pawl is a device fitted to a motor vehicle
A motor vehicle, also known as a motorized vehicle, automotive vehicle, automobile, or road vehicle, is a self-propelled land vehicle, commonly wheeled, that does not operate on railway track, rails (such as trains or trams), does not fly (such ...
's automatic transmission
An automatic transmission (AT) or automatic gearbox is a multi-speed transmission (mechanics), transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions.
The 1904 ...
that locks up the transmission
Transmission or transmit may refer to:
Science and technology
* Power transmission
** Electric power transmission
** Transmission (mechanical device), technology that allows controlled application of power
*** Automatic transmission
*** Manual tra ...
when the transmission shift lever selector is placed in the Park position. "Park" is the first position of the lever (topmost on a column shift, frontmost on a floor shift) in all cars sold in the United States since 1965 (when the order was standardised by the ''Society of Automotive Engineers
SAE International is a global professional association and standards organization based in Warrendale, Pennsylvania, United States. Formerly the Society of Automotive Engineers, the organization adopted its current name in 2006 to reflect bot ...
'' (SAE)) through ''SAE J915'', and in most other vehicles worldwide.
Mechanism
The parking pawl locks the transmission's ''output shaft'' to the transmission casing by engaging a ''pawl
A pawl is a movable lever that engages a fixed component to either prevent movement in one direction or restrain it altogether. As such, it is a type of latch and can also be considered a type of dog. It typically consists of a spring-loaded ...
'' (a pin) that engages in a notched wheel on the shaft, stopping it (and thus the driven wheels) from rotating. The main components of a parking pawl mechanism are the parking gear, parking pawl, actuator rod, cam collar, cam plate, pivot pin, and parking pawl return spring. The mechanism assembly is designed so that the parking pawl tooth collides and overrides the parking gear teeth (ratchets) until a safe engagement speed for the vehicle is reached. Software controls are put in place to avoid this condition and engage the pawl only when the vehicle has come to a standstill.Jeyakumaran, Jeku; Zhang, Nong (2008)"Dynamic Analysis of an Automatic Transmission Parking Mechanism"
University of Adelaide, Australia.
Standards
* FMVSS 114 – Theft Protection and Rollaway Prevention, Keyless Ignition Systems * SAE J2208 – Park Standard for Automatic Transmissions.See also
*Park by wire
Shift-by-wire is an automotive concept or system that employs electrical or electronic connections that replace the Linkage (mechanical), mechanical connection between the driver's gearshift mechanism and the Transmission (mechanical device), trans ...
* Transmission brake
A transmission brake or driveline parking brake is an inboard brake, inboard vehicle brake that is applied to the drivetrain rather than to the wheels.
Historically, some early cars used transmission brakes as the normal driving brake and often ...
* Electronic parking brake
References
External links
Automatic transmission parking pawl for the 2004 Subaru Impreza
Design Requirements for Parking Pawl
Video of Parking Pawl in an automatic transmission
{{DEFAULTSORT:Parking pawl Automotive transmission technologies Vehicle braking technologies