Truck Leaf Spring Suspension U-bolt
Steel plate spring suspension is the most commonly used suspension form for trucks,
with a simple structure, low cost, and good load-bearing performance.
The leaf spring suspension is connected to the vehicle frame (or body) and axle through steel plate springs,
and the steel plate springs are connected to the axle through U-bolts.
The strength and tightening torque of U-bolts affect the service life of steel plate springs and the safety performance of the entire vehicle.
U-bolts are connecting components that fix steel plate springs to the axle, and are a type of suspension fastener.
The function of U-bolts is to connect the steel plate spring and the axle, and they are important components that affect the safety of the entire vehicle.
If the bolt breaks, it can cause the wheels of the driving vehicle to fly out, leading to accidents; Even if the torque of U-bolts deteriorates,
it can cause early fracture of the steel plate and affect its load-bearing performance.
1、Main parameters of thread
The threads of the horse riding bolts are all cylindrical threads. Now, taking the external thread of a regular cylindrical thread as an example,
explain the main geometric parameters of the thread.
As shown:
The maximum diameter of a large diameter d – thread is designated as the nominal diameter in the standard.
Small diameter d1- The minimum diameter of a thread, which is often used as the calculated
diameter for the dangerous section of a screw in strength calculations.
The diameter d2 of the imaginary cylindrical surface passing through the groove and protrusion width on the axial section of the thread,
which is approximately equal to the average diameter of the thread.
Mid diameter is the diameter that determines the geometric parameters and fitting properties of a thread.
Number of threads n – The number of spiral threads in a thread.
A thread formed along a spiral is called a single helix,
A thread formed along two or more spiral lines is called a multi thread.
The commonly used connecting threads require self-locking, so single thread threads are often used.
Pitch P – The axial distance between the corresponding points on two adjacent tooth profiles of a thread.
Lead S – The axial distance traveled by any point on the thread along a uniform helix for one revolution.
Single thread S=P
Multi thread S=n
Tooth angle a – the angle between the two sides of the thread tooth in the axial section of the thread.
Truck Leaf Spring Suspension U-bolt
U-bolts are important components that affect vehicle safety, and special attention should be paid to the verification of fasteners related to safety.
Screw connectors are widely used in suspension and whole vehicles,
There are various types of threaded connectors with different sizes and performance specifications, all of which can be found in national standards,
When designing, it is necessary to consult relevant manuals and select appropriate connectors.
