60/4/5 spring Germany durovis model 60/4/5 price

60/4/5 spring, as an elastic element, is 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 oscillating half-shafts of the front drive axle. However, the manufacturing cost of torsion bars is relatively high, with strict requirements on 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 chromium-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.

60/4/5 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. Its ends can be shaped as splines, square, hexagonal, or cylindrical with flats, so that one end can be fixed to the frame and the other end to the suspension arm, which is connected to the wheel.

60/4/5 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 flats, 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 an obstacle on the ground and jumps 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). 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 return to position quickly. During the manufacture of torsion bar springs, a permanent torsional deformation is pre-induced in 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 and working on the vehicle, with the aim of reducing actual stress during operation and extending service life. Note that left and right torsion bars are not interchangeable.

60/4/5 spring features

Suspensions using torsion bar springs are lighter in weight, have a simpler structure, and do not require lubrication. By adjusting the installation angle of the fixed end of the torsion bar spring, automatic adjustment of vehicle height can be easily achieved. Torsion bar springs store a large amount of elastic energy per unit volume and have low mass. Compared with coil springs, torsion bar springs have a compact structure and are easy to arrange. Torsion bar springs are widely used in off-road vehicles, light buses, and trucks. According to their cross-sectional shape, torsion bar springs can be classified into circular, tubular, and leaf types. Circular solid torsion bars have a simple structure and are the most commonly used. To assemble the torsion bar, its ends are machined into splines, hexagonal, square, etc. Since the spline head size is relatively small, spline connections are mostly used. Generally, the major diameter of the spline is 1.2 to 1.3 times the working diameter of the torsion bar, and the spline length is approximately 1.4 times the major diameter of the spline. As long as the compressive stress on the spline teeth is within permissible limits, the spline teeth should not be selected too long. Torsion bar springs generally use involute splines GB3478. In the JSB2705 standard, the recommended standard pressure angle for splines is 45°; the modules are 1mm and 0.75mm. To facilitate the assembly of torsion bar springs, some torsion bar springs have splines with unequal diameters at both ends, or a blind tooth is machined on the spline teeth at both ends.

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