If you’ve ever tried to unlock your car with a key, you know that a lot is happening behind the scenes. The Door Lock Actuator is an electric motor that operates the door lock mechanism. It’s usually located near the driver’s side of the vehicle, near the latch. There are several actuators; however, most use a small electric motor to rotate a threaded rod. On the end of this rod is an adapter that presses against a long coil spring (usually made from steel). As this motor turns in one direction while pulling on one side of this spring, it unwinds and pushes it in another direction—in this case, toward or away from one end, depending on which way you turn.
The Door Lock Actuator is an electric motor that operates the door lock mechanism.
The Door Lock Actuator is an electric motor that operates the door lock mechanism. When you press the button on your key fob or inside your car to unlock or lock a door, that’s done by an electric motor. The same goes for when you have automatic locks on your doors, like in some newer cars: pressing a button unlocks them, so it’s easier to get out of your vehicle by simply pulling open a door handle.
There are several types of Door Lock Actuator.
The type of actuator in your car depends on the kind of lock.
- An automatic door lock uses a tumbler to turn a key to unlock and open the door.
- An electrical door lock uses an electric motor to open and close the doors, with power provided by the car’s battery or by a separate switch connected to the ignition system.
- A hydraulic door lock is typically found on trucks, construction vehicles, and some newer high-performance cars like Ferraris and Lamborghinis. Electronic systems usually control hydraulic actuators through relays, so they don’t require additional engine power from outside sources.
- Pneumatic actuators use compressed air or nitrogen gas instead of electricity for opening or closing doors—and they’re usually used only for small commercial vehicles like vans or trucks with frequent access needs (like postal workers).
The most common type of Door Lock Actuator uses a small electric motor to rotate a threaded rod.
The most common type of Door Lock Actuator uses a small electric motor to rotate a threaded rod. This rod is attached to a gear in the door lock assembly, connected to the latch that holds it in place. You’re just turning this threaded rod with an electric motor when you turn your key and lock or unlock the car.
The threaded rod has a spring at one end and an adapter (the part receiving the key) at the other. The adapter screws into place on top of an outer shell that’s part of your car’s body panelling; if you pry off your door panelling and take out all those little plastic clips, you can see how this works!
An adapter presses against a long, coiled torsion spring on the end of the rod.
An adapter presses against a long, coiled torsion spring on the end of the rod.
The spring is attached to the rod, coils around it, and then connects to another part of your door lock mechanism. The rod attaches to this part, as does the motor’s gearbox. When you press down on your car’s power door locks button or turn its key to unlock them, this causes current from your vehicle’s battery flow through two wires connected directly to that gearbox. That electricity reaches both ends of your motor magnetically—that’s how engines work!—and causes one side of its shaft (the “field”) to spin around fast while its other side moves relatively slowly (the “armature”). The field spins quickly enough such that when it hits one end of your spring-loaded adapter with sufficient force, it turns around entirely so that its flat edge presses against whatever’s holding up those locks: usually just a metal bar inside each door latch housing
As the motor turns, it unwinds the spring and pushes it in one direction.
As the motor turns, it unwinds the spring and pushes it in one direction. The spring then pushes against a button that slides rods in the door. The rods connect to the latch mechanism that keeps your doors closed.
When you close your door, the motor turns reverse, which winds up the spring again until it’s fully extended.
The spring pulls a sliding button toward one end and pushes it away on the other end.
Now that you know how the Door Lock Actuator works let’s look at how power door locks work.
Power door locks are powered by electricity and use a solenoid to open and close the lock cylinder. The solenoid is an electromagnet that attracts and repels the pin in your lock cylinder. When current is applied to it, it pulls on the hook with a force of about 1 kilogram (2 pounds), which causes it to rotate inside your lock cylinder until it hits something called “contact points,” which are essentially just pieces of metal inside your door lock assembly that keep you from having access when power isn’t flowing through your system.
Pushing or pulling on the button slides rods inside the door that connect to the door latch mechanism.
The power Door Lock Actuator is a cylinder-shaped switch. Inside, you’ll find two rods that slide back and forth when you push or pull the button on your door handle. As those rods move, they activate other mechanisms inside your car.
One rod connects to the latch mechanism, which connects to the door frame and handles. As it moves, this rod causes the latch system—and therefore all of those other things—to move.
Door locks and latches are attached to actuators that operate them.
Door locks and latches are attached to actuators that operate them. Because an actuator is just a motor, it can be powered by electricity or a spring. Some door locks have small springs built into them (like the automatic ones you find on some cars), while others use much larger springs housed in their compartment.
Actuators come in many shapes and sizes, but they all work the same way. When you turn the key or push on the button, electric current moves through a coil of wire inside your lock, causing it to spin around until its teeth mesh with those on either side of it (depending on whether or not you’re trying to open your car). That spin generates enough torque so that even if someone were able to break one part of this system apart somehow—say by cutting off one side’s teeth—it’d still be difficult for them because every time they tried opening up their door locks again, they would have trouble reaching those same points due to being unable to turn any more than 90 degrees at once (unless they had some specialized tool).
Conclusion
Companies hope this article has helped you better understand the Door Lock Actuator. While it may seem simple, a lot of science goes into making one! The actuators are integral to your vehicle’s locking and unlocking systems, so knowing how they work will help you maintain them properly. If your car or truck needs repair or replacement, call companies today to estimate how much it would cost. We’re happy to help!
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