German schloeffel springs schloeffel models schloeffel prices

schloeffel springs, as elastic elements, are widely used in the suspensions of modern automobiles, including passenger cars, trucks, and off-road vehicles. Compared with leaf springs, torsion bar springs offer a series of advantages: high energy storage per unit mass, which reduces vehicle weight and saves material; since the torsion bar spring is fixed to the frame, it reduces unsprung mass, helping to improve ride smoothness; when applied to the front suspension of front-wheel-drive vehicles, the torsion bar spring can be arranged longitudinally, leaving space for the swinging half-shafts of the front drive axle. However, the manufacturing cost of torsion bars is relatively high, with strict requirements for materials and processes. In addition, torsion bar springs serve only as elastic elements and must be equipped with guiding mechanisms. Torsion bar springs are made of chrome-vanadium alloy spring steel, and their surfaces are very smooth after machining. During use, the surface of the torsion bar must be well protected. Typically, a layer of epoxy resin is applied to the surface of the torsion bar spring, wrapped with a layer of fiberglass cloth, coated with another layer of epoxy resin, and finally coated with asphalt and anti-rust paint to prevent collision, scratching, and corrosion, thereby extending the service life of the torsion bar spring.

schloeffel spring structure

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 made into splines, square, hexagonal, or cylindrical with flat surfaces, so that one end can be fixed to the frame and the other end to the swing arm of the suspension, with the swing arm connected to the wheel.

schloeffel 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. Its ends can be shaped as splines, square, hexagonal, or cylindrical with flat surfaces, etc., so that one end can be fixed to the vehicle frame and the other end to the suspension arm, which is connected to the wheel. One end of the torsion bar spring is connected and fixed to the vehicle frame, while the other end is connected to the wheel via the suspension arm. When the wheel encounters an obstacle on the ground and bounces upward, the wheel drives the suspension arm to rotate around the axis of the torsion bar by a certain angle, causing the torsion bar to undergo torsional deformation (elastic deformation). At the same time, the elastic energy stored in the torsional deformation of the torsion bar will be released when the wheel leaves the obstacle, allowing the force transmission mechanism and the wheel to quickly return to their original positions. During the manufacturing of torsion bar springs, the torsion bar is pre-twisted to create a permanent torsional deformation, giving it a certain amount of prestress. The direction of the pre-applied twist is the same as the direction of twist when the torsion bar is installed and working on the vehicle, with the aim of reducing actual stress during operation and extending its lifespan. Note that left and right torsion bars cannot be interchanged.

schloeffel spring manufacturing process

1) Cold forming process capability. Cold forming machines have developed to 12 claws. Wire within the range of (0.3～14) mm can be formed in one go on a 8-claw forming machine. Development directions for forming process equipment: (1) Increase forming speed, with the main trend being to improve the forming speed of the equipment, i.e., production efficiency; (2) Improve equipment durability by enhancing the precision of equipment parts and strengthening heat treatment effects; (3) Add length sensors and laser rangefinders to implement automatic closed-loop control of the manufacturing process for CNC forming machines. 2) Cold forming process range capability. For large wire diameter spring coiling machines, the maximum specification can reach 20mm, =2000MPa, with a winding ratio of 5. The cold forming process for variable-diameter or constant-diameter Minic-Block springs and eccentric springs still has limitations. 2) Hot forming process speed capability. In China, forming in the (9~25) mm specification range relies solely on CNC2-axis hot coil spring machines, with a maximum speed of 17 pieces per minute. There is a significant gap compared with developed countries. 2) Control capability for large spring hot forming processes. Due to the exclusive use of CNC2-axis hot coil spring machines, shape control lacks action in three directions, resulting in poor precision; furthermore, there are no automatic bar rotation control and adjustment mechanisms, so the level and capability of hot coil spring forming processes are relatively low. Consequently, the precision level and surface oxidation and decarburization levels of the springs are also relatively low.

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