In the world of designers LEGO Technic The mechanics come to the fore, turning the game into a serious engineering simulation. One of the key elements that determine the driving qualities and realistic model is the suspension system. It allows the wheels to react to surface irregularities, maintaining grip and stability of the structure.
Unlike hard axles, where the movement of one wheel directly affects the other, free-suspension Each wheel has its own degree of freedom. This technical solution is widely used in modern cars and is accurately reflected in the advanced sets of the Danish brand. Understanding the principles of its operation is essential to create functional RC models or static high-end exhibits.
This article is devoted to a deep analysis of suspension mechanisms in the context of the system. Technic. We will discuss the main types of structures, their advantages and ways of implementation using standard parts. You will learn how to turn a set of plastic bricks into a working prototype of the car chassis.
Principal differences of independent suspension
The fundamental difference lies in the kinematic decoupling of the wheels of one axis. If a single beam is used in the dependent suspension, then here each wheel is attached to its own lever or rack. In terminology. LEGO This means using separate attachment points to the frame or supporting body of the model.
The implementation of such a scheme requires careful planning of the space inside the chassis. Rotation points should be positioned so that during compression the wheel moves mainly vertically, minimizing the change in track. For this in Technic Beams of different lengths and special connecting elements are actively used.
⚠️ Attention: When designing, make sure that the stroke of the suspension levers is not limited to the transmission elements or the body frame. Jamming of the mechanism during compression can lead to breakage of the gears of the differential.
An important aspect is the use of depreciation. In real cars and quality models LEGO This is the responsibility of spring elements or pneumocylinders. They extinguish the vibrations, returning the wheel to its original position after passing the irregularity.
The main types of suspension in LEGO Technic
Engineers LEGO And fashion fans have developed a lot of circuits that mimic real car nodes. The most common and easy to assemble is a type suspension. MacPherson. It is compact and requires a minimum of parts to implement the vertical stroke of the rack.
More complex and realistic designs, such as double-lever Double Wishbone, which provides better stability and control of the wheel. In sets. Technic This is often accomplished through a system of levers connected to a swivel fist. This scheme allows you to accurately adjust the geometry of the suspension.
For truck models or SUVs is often used spring-suspension or imitation of it using flexible beams. Although technically it can be a dependent circuit, the correct layout allows you to achieve high cross-country. The type choice depends on the purpose of your model and the available space.
Key elements and parts for assembly
Assembly of high-quality suspension is impossible without the correct selection of components. Particular attention should be paid to the bearings of slip and axes. The use of smooth axes without stoppers in the places of rotation of the levers is critical for free running.
In the arsenal of builder a must be present different types of springs. LEGO It produces springs of different stiffness and length, which allows you to choose the best option for the weight of the model. Also irreplaceable. telescopic shock absorberswhich can be found in large sets or bought separately.
- 🔹 Pneumocylinders: Ideal for simulating the operation of shock absorbers and creating an adjustable suspension.
- 🔹 Articulated joints: necessary for the transmission of rotation to the wheels while maintaining the freedom of movement of the suspension.
- 🔹 Crowd wheels and differentials: provide torque transmission even at large wheel strokes.
Don't forget about it. Technic Pins (kick) frictionless and non-friction. For movable joints, always use smooth pins or axes to avoid unnecessary drag. Rigid connections are only permissible in static frame nodes.
Use a lubricant for plastic models (silicone) on rubbing surfaces of axles and bushings if the model is designed for active driving. This will significantly extend the service life of the mechanism.
Comparative analysis of suspension types
To choose the best solution for your project, you need to compare the technical characteristics of different schemes. Below is a table that helps to determine the choice depending on the modeling tasks.
| Type of suspension | Difficulty of assembly | Realism | Space required |
|---|---|---|---|
| McPherson. | Low. | Medium. | Minimum |
| Double levers. | Tall. | High-pitched | Big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big |
| Torsion | Medium | High-pitched | Average. |
| Pneumatic | Very high. | Maximum | Significant |
As the data shows, ease of implementation often conflicts with functionality. Torsion suspension It occupies an intermediate position, offering a good balance between compactness and quality of work. It is often found in military truck models.
For racing cars, where a low center of gravity and accurate tuning are important, double levers remain the uncontested leader. They allow engineers to do this. Technic control the collapse of the wheels depending on the course of compression.
Integration with transmission and drive
The most difficult part of the design is the combination of an independent suspension with a drive. The wheel should not only move up and down, but also rotate, receiving torque from the motor. To accomplish this task, they are used drive-shaft (cardan shafts) and hinges.
It is important to observe the length of the driveshaft. When the suspension is compressed, the distance between the differential and the wheel decreases. If the shaft is rigid, it will either fly out or break the mechanism. V LEGO This problem is solved with the help of telescopic cardanas or special slippery connections.
The Secret of the Telescopic Cardan
Use a connection where one axle enters another tube with a gap, or special parts from the Supercar series sets that allow you to change the length of the drive.
When assembling the drive on an independent suspension, be sure to use Universal Joints (driver joints) on both sides of the shaft. This compensates for the change in the angle of inclination of the wheel relative to the differential during the suspension operation.
⚠️ Warning: Excessive gimbal hinge angle (more than 45 degrees) leads to rapid wear and jamming. Design the suspension levers so that the angles remain within acceptable limits.
Practical tips for assembly and configuration
The assembly of the chassis requires patience and accuracy. Start with the frame, making sure that all the lever mounting holes are symmetrical. Any shift will lead to the model moving aside when moving.
Checking the work is carried out manually before installing the motors. Click on the center of the model - it should sit smoothly and come back. If you hear creaking or walking tightly, look for axle skewings or too tight connections.
☑️ Check of the running gear
To improve the characteristics, you can experiment with the stiffness of springs. Harder springs are suitable for sports models, while soft ones are better to imitate SUVs. Replacing standard springs with custom springs or combining several elements allows you to achieve a unique balance.
Don't ignore aesthetics. Even if the mechanism is hidden under the body, the careful laying of wires (for motors) and hoses (for pneumatics) inside the frame will simplify further maintenance and repair of the model.
Frequently Asked Questions (FAQ)
Can I make a pneumatic suspension in a small LEGO set?
Theoretically, yes, but it would require the use of miniature pneumo cylinders and a compact compressor. However, for smaller models (less than 500 parts), this is often redundant and weighs the design down, upsetting the balance.
What parts are best for imitating shock absorbers?
It is best to use specialized parts. Technic Shock Absorbers. If they are not, you can use a combination of a pneumo cylinder without air supply (like a damper) or springs with a travel limiter.
Why does the suspension roll when turning the wheels?
Most likely, the driveshaft is too long or does not have free passage. Also, the cause may be a collision of the suspension lever with the steering elements. Check the gaps in the extreme positions.
Do I need to use the LEGO Technic suspension?
For static models, no. For actively rolling RC models, dry silicone lubricant will prolong the life of rubbing parts, but it must be applied carefully so as not to collect dust.