What is a car hood lock
Youdaoplaceholder0 Car hood lock is a locking device for the hood (or engine cover) of a car. It is located above the engine hood at the front of the vehicle and is used to fix and lock the engine hood to prevent it from opening or closing at will. The cover lock usually consists of parts such as the lock body, lock tongue and lock buckle, which are controlled to open and close by mechanical or electronic means .
The design of the machine cover lock needs to take the following points into consideration:
Youdaoplaceholder0 opening and closing effect : To save costs, the hood lock used in already mass-produced models is often adopted, or existing products from the supplier are used. When setting up the engine hood lock, calculate the mass of the engine hood to ensure that the K value and stiffness coefficient of the spring can unlock and make the engine hood spring up to a height generally greater than or equal to 15mm.
Youdaoplaceholder0 Safety : Design safety hooks to ensure that in the event of an accidental opening of a lock while driving, the safety hooks can still lock the hood to prevent it from opening, blocking the driver's view and causing an accident. The safety hook is designed to ensure that it cannot be unlocked under 20G inertial force .
Youdaoplaceholder0 Technical standards : Technical standards such as ECE and FMVSS stipulate that there must be two locks to ensure security and reliability .
The function of the hood lock is extremely important. It is not only used to fix and lock the engine hood to prevent it from opening or closing at will, but also serves to protect the internal components of the vehicle and the safety of the driver. Control IT TO turn on and OFF by mechanical or electronic MEANS TO ENSURE NORMAL WORK under all CONDITIONS .
Youdaoplaceholder0 The main functions of the car hood lock include the following points :
Youdaoplaceholder0 Protect components in the engine compartment : The hood lock can protect many car components in the engine compartment from foreign objects entering and affecting the normal use of the car .
Youdaoplaceholder0 Anti-theft : By locking the engine compartment to prevent unauthorized access, it protects the parts inside from theft .
Youdaoplaceholder0 Ensure driving safety : The design of the hood lock needs to take into account the opening and closing effects to ensure that it does not accidentally open during driving and prevent the hood from suddenly bouncing up and blocking the driver's view, causing an accident .
Youdaoplaceholder0 Design considerations for cover lock :
Youdaoplaceholder0 Opening and closing effect : The mass of the hood needs to be calculated in the design to ensure that the K value and spring constant of the spring connecting the lock and the card can unlock and make the hood spring up, and the spring up height is generally greater than or equal to 15mm.
Youdaoplaceholder0 Safety : Design safety hooks to ensure that in the event of a lock accidentally opening while driving, the safety hooks can still lock the hood to prevent it from opening .
Youdaoplaceholder0 Reliability : The hood lock must meet technical standards such as ECE, FMVSS, etc., which stipulate that it must have two locks to prevent the safety hook from accidentally unlocking during vehicle jolting or twisting .
The working principle of the car hood lock
The car hood lock achieves safety locking through mechanical or electromechanical collaborative design. The core components include the lock core, lock rod, lock buckle and electronic control unit, which are specifically divided into three stages: trigger locking, mechanical self-locking and electronic control.
Mechanical locking principle
Youdaoplaceholder0 Trigger and lock mechanism
When the machine cover is closed, the lock tongue or lock buckle matches the hole/slot on the machine cover, triggering the locking action. The lock rod is inserted into the hole of the lock core and self-locks through the gear structure to ensure a firm fixation.
Some of the designs adopt a rotating hook (45° rotating hook to hold the lock) and a compressed spring structure, combined with positioning pins and pawl to form a locked state, enhancing safety.
Youdaoplaceholder0 Unlock process
The driver operates the switches (such as kettles or buttons) inside the driver's cabin, pulls the locating pin through the pull wire or connecting rod, releases the lock buckle, and the spring assists in pushing the lock body to complete the opening.
Electronic control function (for advanced models)
Youdaoplaceholder0 Sensors and command control
Electronic sensors (such as contact switches) detect the status of the lock tongue and feed it back to the vehicle control unit. The main control unit can be remotely instructed to lock/unlock and integrates an anti-theft alarm function.
Youdaoplaceholder0 Collaborative Security Design
The electronic system is linked with the mechanical structure. For example, when unlocking, both the electrical signal authorization and the mechanical trigger conditions must be met simultaneously to prevent illegal opening.
Auxiliary retention device
After the hood is opened, the lever or spring device maintains its lifted state for easy maintenance. When closed, it automatically engages with the lock by gravity.
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