A rack and pinion is a linear actuator type consisting of a pair of gears that convert rotational motion into linear motion. The circular teeth called "pinions" attach teeth to a linear "tooth" rod called a "shelf"; The rotational motion applied to the pinion causes the shelf to move relative to the pinion, thus translating the pinion rotation movement into linear motion.
For example, on rails, rotating pinion mounted on locomotives or railcar involves shelves between rails and forcing trains to ride steep slopes.
For each pair of conjugate conjugate profiles, there is a basic rack. This base shelf is a toothpick of conjugated pitch radius of pitch up (ie straight edge of toothed).
Generating shelves are rack lines that are used to indicate the details and dimensions of a tooth for the design of generators, such as a stove or cutter.
Video Rack and pinion
Apps
The combination of rack and pinion is often used as part of a simple linear actuator, in which the rotation of the shaft is powered by the hand or by the motor is converted into linear motion.
The shelf carries a full load of actuators directly and so the drive pinion is usually small, so the gear ratio reduces the required torque. This force, thereby torque, may still be quite large and is very common for it to be a reduction gear soon before this with either a tooth or a worm gear reduction. Tooth rack has a higher ratio, so it requires a larger driving torque, rather than a screw actuator.
Stairlifts
Most stairlifts currently operate using rack and pinion systems.
Director
Shelves and pinions are usually found on the steering mechanism of a car or other steering wheel. Shelves and pinions provide less efficient mechanical advantages than other mechanisms such as recirculating balls, but fewer backlash and greater feedback, or "feel" of the wheel. The mechanism may be assisted by power, usually by hydraulics or electricity.
The use of variable shelves (still using normal pinion) was discovered by Arthur Ernest Bishop in the 1970s, so as to improve vehicle response and steering "feel", especially at high speed. He also created a low cost forging process to manufacture shelves, eliminating the need for dental machines.
Rack railways
The cable car is a mountain rail line that uses a shelf built in the middle of the tracks and pinion in their locomotive. This allows them to work on a steep gradient, up to 45 degrees, compared to conventional trains that rely on friction alone for propulsion. In addition, additional shelves and pinion provide these trains with controlled brakes, and reduce the effects of snow or ice on the tracks.
Actuator
Shelves and pinions with two racks and one pinion are used in the actuator. Examples are pneumatic racks and pinion actuators that can be used to control valves in pipeline transport. The actuator in the image on the right is used to control the large water pipe valve. In the top actuator, a gray control signal line can be seen connecting to the solenoid valve (a small black box attached to the back of the top actuator), which is used as a pilot for the actuator. The solenoid valve controls the air pressure from the input air channel (a small green tube). Air output from the solenoid valve is fed into the room in the center of the actuator, increasing the pressure. Pressure in the actuator chamber pushes the piston away. While the piston moves apart from each other, the connected shelf is also moved along the piston in the opposite direction of the two racks. Both racks are connected to pinion on the teeth directly from the pinion. When both shelves move, the pinion is rotated, causing the main valve installed from the water pipe to spin.
Maps Rack and pinion
Arcuate rack
The curved shelf teeth are called arcuate racks. This term appears in many patent applications.
See also
- List of dental nomenclature
- Sprocket
References
Source of the article : Wikipedia
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