External length: (La) 1000 mm
Effective length: (Ld) 990 mm
Internal length: (Li) 950 mm
Profile: 22 x 8 mm
Brand: ConCar
Description
ConCar Variable Speed Belts 22x8 – 950 mm inner length – DIN 7719 / ISO 1604
This ConCar Variable Speed Belts with a 22x8 profile and a 950 mm inner length, is a toothed variator belt conforming to DIN 7719 and ISO 1604. Variable Speed Belts are the mechanical alternative to frequency converters: they regulate the output speed purely through geometry, without electronics, harmonics, or an additional heat source in the control cabinet. In many woodworking, textile, and agricultural machines, this remains the more robust solution because it operates reliably even in dusty, humid, and vibration-prone environments.
This length in the drive
The inner length of 950 mm is a standard length in the mid-range for the 22x8 profile. For reference: With two pulleys of the same size and an effective diameter of 200 mm, the corresponding center distance is approximately 180 mm. At a belt speed of 20 m/s, the belt rotates around 20.2 times per second. This combination of moderate bending frequency and sufficient wrap is the reason why most standard drives operate within this length range.
For design and comparison with an existing belt, the three length specifications are important because manufacturers use different reference dimensions. The inner length (Li) is 950 mm; it is measured at the inner circumference of the belt and is the standard ordering dimension in Germany. The effective length (Ld) of 990 mm refers to the neutral axis and is the dimension used in many catalogs and drive calculations. The outer length (La) of 1,000 mm is measured at the back of the belt. With a profile height of 8 mm, the difference between the inner and outer lengths is 50 mm, which corresponds to twice the difference in circumference across the belt height. When replacing an old belt, always compare using the same reference dimension; otherwise, you can easily be off by several centimeters.
Dimensions and specifications
Internal length (Li): 950 mm
Effective length (Ld): 990 mm
External length (La): 1,000 mm
Profile: 22x8 according to DIN 7719 / ISO 1604
Top width: 22 mm
Height: 8 mm
Flank angle: 25°
Construction: open-sided, toothed
Mixture: Chloroprene (CR)
Tensioning material: Polyester cord
Antistatic: yes, according to ISO 9563
Temperature range: -30 °C to +80 °C
Belt speed: up to 30 m/s
Weight: 0.152 kg
Article number: G422080950
EAN: 4059213020691
Manufacturer: ConCar
Structure and materials
The belt consists of a chloroprene rubber core with a longitudinally inserted polyester cord as a tensile member. The flanks are open, meaning they are not covered with fabric. This noticeably increases the coefficient of friction on the pulley and thus improves the transmissible torque, but in return requires clean, unworn pulley flanks. The compound is antistatically conductive according to ISO 9563, which allows the belt to be used in dusty areas and in ATEX-relevant environments.
The 25° flank angle is the crucial difference compared to a conventional V-belt, which operates at 34 to 40 degrees. The shallower angle generates less wedging effect per millimeter of radial travel, ensuring smooth belt operation across the entire pulley adjustment range and preventing binding at the end positions. Simultaneously, the large upper width of 22 mm provides the necessary contact area to transmit torque solely through friction. The toothed underside reduces bending stiffness to such an extent that the belt can operate even on small effective diameters without the flanks overheating due to internal flexing.
Typical areas of application
Belts of this size are typically found in compact drives: bench drills and small lathes with continuously variable spindle speed, feed drives on band and circular saws, laboratory centrifuges and shakers, dosing and small conveyors in packaging lines, as well as garden equipment and small drives where the installation space does not allow for large pulleys.
What these applications have in common is that the rotational speed must be adjusted during operation to suit the material, batch, or demand. A Variable Speed Belts solves this problem purely mechanically, without any electronics in the drive train. This is advantageous wherever dust, moisture, vibration, or temperature would damage a frequency converter, and it remains the only economical solution for existing machines because the variator is an integral part of the machine's design.
Assembly and tension
Before ordering, check the adjustment range of your drive. The belt must be able to be fitted without force, whether the pulleys are fully closed or open. After fitting, tension the belt to the tension specified by the machine manufacturer and check again after the break-in period. If several belts run in parallel in one drive, they must always be replaced as a complete set, as a new belt, in addition to worn ones, bears the entire load.
Before you classify a belt as worn, it's worth taking a look at the pulley. A worn groove allows the belt to sink deeper, causing it to sit on the bottom of the groove and lose contact with the belt flanks. This manifests as a sudden loss of power, even with a seemingly new belt. This can be checked in a minute using a groove feeler gauge.
Similar names for other brands
Variable Speed Belts are standardized according to DIN 7719 and ISO 1604. A belt with a 22x8 profile and a 950 mm inner length is therefore dimensionally identical regardless of the manufacturer; no modification of the pulleys is required for replacement. This ConCar belt replaces, among others:
OPTIBELT: VB 22x8 / VARIO POWER 22x8
GATES: Multi-Speed 22x8 / Predator V Variable Speed
CONTITECH: VARIO Speed 22x8 / CONTI-V VARISPEED
MEGADYNE: VARISECT 22x8
MITSUBOSHI: VARI-SPEED 22x8
BANDO: Variable Speed 22x8
PIX: Variable Speed 22x8
Delivery
The belt is supplied as a single, endless belt. Standard lengths and common profiles are available from stock; custom lengths and widths are available upon request. If you are unsure which length your drive requires, please send us the part number of your old belt or the dimensions of your pulleys, and we will check the compatibility.