German strack springs, strack models, strack prices

strack springs consist of tension springs and connecting springs. The pitch and helix direction of the tension spring and the connecting spring are identical. A specialized fixture is used to clamp one end of the tension spring and screw it into the connecting spring. The other end of the tension spring is then rotated and fitted onto the other end of the connecting spring. Rotational force is used to screw the connecting spring into the interior of the tension spring, forming a ring spring. This utility model ring spring does not affect the shape and elasticity of the connection point and provides a secure connection for various applications requiring ring springs. The ring spring is composed of alternating stacked washer-shaped spring steel pieces with inner conical and outer cylindrical surfaces and washer-shaped spring steel pieces with inner cylindrical and outer conical surfaces. The number of pairs of inner and outer rings in the ring spring is determined by the magnitude of the load it bears and the deformation requirements. Ring springs are used in applications with limited space that require strong buffering.

strack spring principle

When leaf springs are installed in an automobile suspension and subjected to positive vertical loads, all spring leaves deform under stress, tending to arch upward. At this time, the axle and frame move closer together. When the axle and frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, sometimes even reversing. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition of the main leaf eye, the end of the second leaf is often bent into an eye that wraps around the outside of the main leaf eye, known as a wrap-around eye. A large gap is left between the main leaf eye and the second leaf's wrap-around eye to allow relative sliding during elastic deformation. In some suspensions, the ends of the leaf springs are not formed into eyes but use other support connection methods, such as rubber support pads. Flat rectangular steel plates are curved and stacked to form chassis springs. One end is mounted on a hanger with a pin, and the other end is connected to the frame with a shackle, allowing the spring to expand and contract. This design is suitable for medium and large trucks. Automobile leaf springs are very important. As is well known, leaf springs are composed of many steel leaves that are elastic, have consistent width and thickness, but vary in length. Their function is to connect the frame and axle via suspension, exposed between the frame and axle, bearing the load impact from the wheels on the frame, reducing severe vehicle vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs bear load impacts, they undergo extension motion, causing intense friction between the steel leaves, resulting in compression and tension phenomena. The two friction surfaces generate motion friction forces in different directions, causing the temperature of the leaf spring to rise, leading to surface scoring and small cracks. As the frequency of load impact increases, the frictional force generated by the extension motion also increases. When the stress concentration point reaches the fatigue limit, it causes single-leaf or entire-stack fracture. Kinetic experiments prove that a steel component undergoing compression-extension motion experiences a temperature rise and strength decrease as motion frequency increases. Cracks appear at stress concentration points, gradually expanding and deepening until damage occurs at the fatigue limit. Leaf springs behave similarly, though they have higher elasticity and are more durable than general steel components. Apart from other causes, the main reason for leaf spring fracture is poor lubrication, which should be taken seriously by drivers and technical management personnel. Timely lubrication of leaf springs is essential to reduce friction and distribute stress, preventing surface scoring of the steel leaves; to reduce the intrusion of dust, dirt, and water, preventing rust; and to dissipate heat, preventing a decrease in elastic strength. The general lubrication method is as follows: Lubrication should be performed after the new vehicle break-in period is complete, and during summer and winter when the vehicle is in use. For lubrication, first remove the leaf spring, open the center bolt to separate the steel leaves, then evenly apply lithium-based grease or graphite grease to both sides of the steel leaves. After reassembly, an oil film forms between the two friction surfaces (comparing the time required for lubricating a set of leaf springs to replacing a single broken leaf).

strack spring structure and principle

The torsion bar spring itself is a torsion bar made of spring steel. The cross-section of the torsion bar is usually circular, with a few being tubular or rectangular. The shapes of its two ends can be splined, square, hexagonal, or cylindrical with flat surfaces, so that one end can be fixed to the frame and the other end to the suspension arm, which is connected to the wheel. One end of the torsion bar spring is fixed to the frame, and the other end is connected to the wheel via the suspension arm. When the wheel encounters a ground obstacle and jumps upward, the wheel drives the suspension arm to rotate around the torsion bar axis by a certain angle, causing the torsion bar to undergo torsional deformation (elastic deformation). Meanwhile, the elastic potential energy stored in the torsional deformation of the torsion bar is released when the wheel leaves the obstacle, allowing the force transmission mechanism and the wheel to quickly return to position. During the manufacture of torsion bar springs, a permanent torsional deformation is pre-applied to the torsion bar to provide a certain pre-stress. The direction of the pre-applied torsion is the same as the direction of torsion when the torsion bar is installed on the vehicle and in operation, with the aim of reducing actual stress during operation and extending service life. Note that left and right torsion bars are not interchangeable.

strack spring functions and applications

Functions: 1) Measurement function. We know that within the elastic limit, the extension (or contraction) of a spring is proportional to the external force. Spring scales are made using this property of springs. 2) Clamping function. Observing various electrical switches reveals that one of the two contacts in a switch must be equipped with a spring to ensure tight contact between the two contacts for good conductivity. If contact is poor, the resistance at the contact point increases, generating more heat when current passes through, which can severely melt the metal at the contact point. The two metal pins of bayonet lamp holders are also equipped with springs to ensure good contact. The central metal piece of screw-type lamp holders and all contact metal pieces of sockets are spring tabs, whose function is to ensure tight contact between both parties for good connectivity. In cassette tapes, a phosphor bronze spring tab uses the elastic force generated by its bending deformation to keep the magnetic head in close contact with the tape. A long coil spring in a stapler serves to push the staples tightly and, once the frontmost staple is ejected, pushes the subsequent staples to the front for comfortable ejection, automatically pushing staples one by one to the front until all are ejected. Many machines' automatic feeding systems and the automatic chambering of bullets in automatic rifles rely on this function of springs. In addition, clothespins, ballpoint pens, and pen cap clips utilize the clamping function of springs to attach to clothing. Applications: 1) Bearing vehicle weight, meaning that most of the vehicle's weight is normally supported by the springs. 2) Mitigating road bumps. Coil springs are buffering elements. When the impact force from the road on the wheels is transmitted to the coil spring, the coil spring deforms, absorbing the kinetic energy of the wheels and converting it into potential energy of the coil spring, thereby mitigating the impact of the ground on the vehicle body. However, the coil spring itself does not consume energy; the spring storing potential energy will restore its original shape, converting the potential energy back into kinetic energy. If springs are used alone without damping elements, some light cars will bounce up and down continuously like acrobats on a trampoline after a single impact. In automobile manufacturing, independent suspension axles are split into two sections, with each wheel independently mounted under the frame via a coil spring. When one wheel bounces, the other wheel is unaffected, allowing both wheels to move independently, improving the vehicle's stability and comfort.

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