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optibelt KS for Taper-Bushings

KS V-Grooved Pulleys for Taper-Bushings - Grooves acc. to DIN 2211

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Datum diameter (mm)
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Description

V-grooved pulleys in Use: Function and Characteristics

V-grooved pulleys are a central component of a V-belt drive. They are used to connect two shafts. Power is transmitted via static friction - also known as adhesion - between the flanks of the V-belt and the pulleys, thereby creating a force connection.
V-grooved pulleys, also known as wedge pulleys, feature one or more grooves in which the V-belts are securely guided. The profile of the V-grooved pulley is precisely matched to the respective belt profile. The number of grooves depends on the number of V-belts required.


V-grooved pulleys in operation: Power, transmission ratio, and application

Optibelt KS V-grooved pulleys offer a wide range of applications due to their transferable power and permissible speeds. In positive V-belt drives, transmission ratios of up to i = 1:12 can be achieved. Typically, such a drive consists of a drive pulley and a driven pulley. Due to the friction-based power transmission, there is always a small amount of slip, which means that in practice, the speed of the driven pulley is approximately 1% lower. Optibelt recommends friction-based V-belt drives especially for non-synchronous power transmissions. They are characterized by high cost-effectiveness, reliability, and - compared to timing belts - a long service life.
Friction-based power transmission using optibelt V-belts and KS V-grooved pulleys is particularly well-suited for power drives. The following applies: The larger the belt profile, the higher the transmissible power. Another area of application is conveyor drives. V-belts are not suitable for linear drives. In such cases, positive-engagement power transmission using optibelt timing belts and ZRS timing pulleys should be used.


We reserve to alter specifications without notice.

Details

Efficient power transmission

Advantages of V-Belt Drives

High load capacity

Resistant to torque surges and short-term overloads

Easy to install and low-maintenance

Easy installation with minimal maintenance requirements

Long service life

For a durable and reliable drive system

Efficiency

Efficient performance with low operating and maintenance costs

Suitable Product Solutions

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These products perfectly complement the application and are ideally coordinated with each other.

Design and Function of the V-Groove Pulley

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The most important specifications for a V-grooved pulley are the belt profile, the datum diameter, the outer diameter, the number of grooves, and the design of the shaft-hub connection. All V-grooved pulleys are typically specified by their profile, nominal diameter, and the corresponding number of grooves.

Standardized Pulleys with high compatibility

Optibelt V-groove pulleys are available in the narrow V-belt profiles SPZ, SPA, SPB, and SPC. While V-belts differ in their overall height, there are no differences between the pulley grooves (groove dimensions) for narrow V-belts according to DIN 7753 Part 1 or classic V-belts according to DIN 2215 and DIN 2216. The groove dimensions are specified so that all internationally standardized V-belts with the narrow V-belt profile, as well as those with the corresponding classic profile, can be used.

  • SPZ / 10
  • SPA / 13
  • SPB / 17
  • SPC / 22

Significance of the Datum Diameter

The datum diameter is the most important test criterion for a V-groove pulley. It refers to the diameter corresponding to the width of the pulley groove. Unlike the outer diameter, the datum diameter is measured within the profile. Its position is determined by the tension strand of the V-belt in contact with the pulley. The datum diameter is the key parameter for calculating the transmission ratio.

To ensure a long belt life and economical operation of the drive, the pulley diameters should be selected as large as possible. The recommended minimum pulley diameters must be observed. However, the belt speed should not exceed v = 30 m/s for standard V-belts or v = 40 m/s for narrow V-belts, as the belts achieve their optimal power transmission within this range.

Number of Grooves and Geometry of V-grooved pulleys

The optibelt standard range includes V-grooved pulleys with one to twelve grooves, depending on the profile and center diameter. The grooves on optibelt KS V-grooved pulleys are manufactured in accordance with DIN 2211. A complete overview of the geometric specifications for optibelt KS V-grooved pulleys can be found in the Technical Manual for V-belt Drives.

Types of V-Grooved Pulleys

Optibelt standard V-groove pulleys are available as solid, plate, or spoked pulleys. It should be noted that solid and flat-bottom pulleys generally achieve higher permissible circumferential speeds than flanged pulleys.

Optibelt standard V-grooved pulleys are manufactured in accordance with the ISO 254 quality standard. The pulleys are available in Taper-Bushings versions or with cylindrical bores. Versions with cylindrical bores are always delivered pre-bored and can, upon request, be equipped with a finished bore in accordance with DIN, including keyways, as well as mounting threads for adjusting screws on request.

Detailed information on the respective design can be found in the corresponding design drawings, which provide details on the specific design of the selected pulley.

Balancing & Maintenance

All standard gray cast iron V-grooved pulleys are statically balanced — that is, in a single plane — to grade G16 and can be used in applications with speeds up to 30 m/s. Balancing is performed in accordance with DIN ISO 21940. Dynamic balancing in two planes to grade G6.3 is recommended if the belt speed v > 30 m/s or if the ratio of the straight diameter to the pulley rim width is less than 4 at v > 20 m/s.

In all cases, the maximum permissible belt speed and the maximum circumferential speed of the respective V-grooved pulley must be observed. Alternative material grades and special designs are available for higher rotational speeds. Before installation, shafts and V-grooved pulleys should also be aligned.

Shafts and V-grooved pulleys must be aligned before installation. It is also important to replace damaged pulleys or pulleys with clearly visible wear in good time to prevent premature belt failure. We recommend replacing V-grooved pulleys when changing the belt for the third time.

The optibelt belt and groove gauges allow for quick and easy identification of V-belts and V-grooved pulleys. They also enable reliable determination of profiles and inspection of the wear condition of pulleys.

optibelt PROFILE GAUGES

High-quality materials for durable drives

Our standard V-grooved pulleys are mainly made of gray cast iron (material EN-GJL 200 - DIN EN 1561). In some versions, depending on size, black oxided steel is also used. Compared to aluminum, gray cast iron is characterized by higher wear resistance and does not become shiny as quickly. This ensures consistently optimal static friction. In addition, the material provides good damping of shock torques and contributes to smooth, quiet operation of the drive. The surface phosphating of the gray cast iron pulleys also ensures increased corrosion resistance.

In addition to our standard gray cast iron V-grooved pulleys, we also offer numerous other material and surface options. Our application engineers will be happy to advise you on your specific requirements.

Services & Tools

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CAD Tool


The CAD service tool enables the generation of product data sheets, 2D drawings and 3D models. A free download of all common file formats is available for you.

CAP 6.0/6.5


The CAP calculation program is used to calculate and design belt drives. It offers a user-friendly and fast drive design. After successful registration, you have the option of activating Optibelt CAP 6.0 and Optibelt CAP 6.5 as a licensed single-user full version.

Do you need a custom solution?

If the use of standard V-grooved pulleys is not possible due to design or environmental influences, special V-grooved pulleys can also be supplied according to customer drawings. Please contact our experts and describe your requirements.

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