CO-MOULDED BOLTS

In The automotive industry, co-moulded bolts are designed and produced solely for the electric motor.

They secure all those components that work at high voltages. For this reason, the co-moulded bolts consist of a steel core and a plastic-coated head moulded with the bolt, which allows the part that a user might touch to be safely insulated.

In the internal combustion engine, the only component with a very high inrush current is the starter, and it reaches high voltages only with a turned key.

The rest of the system works at 24 Volts, a voltage not hazardous for people, so it does not require co-moulded bolts.

In electric motors, on the other hand, the combustion process is replaced by the transformation of current into mechanical energy.

The combustion causes the system to reach 400, 600, or even 800 volts in sports cars.

The electric platforms, including the hybrid or plug-in hybrid cars, consequently demand several user safety stratagems, including the necessary use of co-moulded bolts and other particular executions such as those contemplated for the rotor bolts.

Peculiarities

Optimisation of the execution procedure

Single check

The plastic part is moulded on the bolt's steel head

Execution phase

Study of the geometries and thicknesses

#Functions

The co-moulded bolts are designed specifically for the electric motor. They are used to tie all those components that operate at elevated voltages.

#Characteristics

The co-moulded bolts consist of a steel core and a plastic-coated head moulded with the bolt, safely insulating the part that a user might touch.

#Brugola OEB

Brugola OEB co-moulded bolts are the outcome of many years of experience and the supreme attention paid to the unique necessities and specifications of each customer.
Every fastener that we produce comes up to the Total Quality and Zero Defects principles.
Tightening involves the plastic part, so utmost attention is required to carry out the geometries and thicknesses.

The tightening involves the plastic part, maximum attention is required for the realization of geometries and thicknesses.

Brugola OEB co-moulded bolts: the main characteristics

Making bolts with steel cores and plastic caps is not innovative per se.
On the contrary, it is common practice also in other sectors, not only in the automotive industry.

However, Brugola OEB co-moulded bolts are a peculiarity on the fasteners scene because they optimize the execution procedure and make their use even safer.

The traditional solution to obtain these fastening elements entails separately making the steel bolt and then applying an orange plastic cap that functions as an insulator.
This system – which is not used to create Brugola OEB co-moulded bolts – presents some critical problems.
The cap is an extra component that has its cost and dimensions.
It is also necessary to make sure that every bolt is properly closed to guarantee maximum safety.
This procedure, therefore, requires a double control: not only on the bolt’s position but also on the closure of the plastic component.

Brugola OEB co-moulded bolts solve the problem because the plastic part is moulded on the steelhead of the bolt according to a precise geometry.
As there is no longer a separate cap to apply, once the co-moulded bolts are properly positioned there is total confidence that the insulating element is safe, without the need for a double control.
Considering that the tightening of this special fastener involves the plastic part moulded on the bolt, it requires very careful attention during its production, especially from the viewpoint of the study of geometries and thicknesses.
In the production of co-moulded bolts, it is necessary to be up to date with a series of regulatory constraints given by the plastic material.
These included, for example, observance of fire prevention regulations, self-extinguishing of material, and the guarantee of minimum thickness in all sections of the plastic.
These conditions certainly entangle the execution process of co-moulded bolts, but also, in this case, Brugola OEB supports the production of Total Quality and Zero Defects products.

In the production of co-moulded bolts, it is necessary to be up to date with a series of regulatory constraints given by the plastic material. These included, for example, observance of the fire prevention regulations, self-extinguishing of material, and the guarantee of minimum thickness in all sections of the plastic.

These constraints certain complicate the execution process of co-moulded bolts, but also in this case Brugola OEB is able to supply Total Quality and Zero Defects products.

Why choose
Brugola OEB co-moulded Bolts

To properly tighten a bolt, it is necessary to transmit torque through the bolt’s head.
As previously explained, in the case of co-moulded bolts, the head is made of plastic, while the core of steel.
It is, therefore, necessary to design the internal part of the fastener to transmit the torques to tighten the bolt without damaging the plastic part and compromising the insulation.

Like every Brugola OEB product, co-moulded bolts are subjected to exhaustive analysis and geometrical study to ensure the best performance.

Furthermore, we test 100% of the bolts we produce.

All fastening elements in steel and other materials we make undergo optical control and behavior simulations to give the customer a thorough overview even before production.

Due to the disruptive nature of the test, this is impossible with co-moulded bolts.

However, we perform sample pieces analysis to ensure the highest production standard.

Our company is the leader in automotive fastening elements’ design and manufacture and one of the first to develop more functional bolts suitable for electrification.

Our innovative spirit has made us pioneers also in co-moulding technology and ready to meet the new challenges faced by the electric motor in the future.