SKF PIV Chains (Self forming tooth chains). . . . . . . . . . . . . . . . 77 Chain selection procedure and design guidelines. . . . . . . . . . . 12 Power rating tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Basic Selection procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Chain chemical resistance comparison . . . . . . . . . . . . . . . . . . . 87 Useful formulae for power transmission. . . . . . . . . . . . . . . . . . 90 SKF American standard chains. . . . . . . . . . . . . . . . . . . . . . . . . . 35 SKF BS European standard chains....

Standards and compliance SKF chains are manufactured in state of the art facilities with tight quality controls. All products conform to ISO standards and other industrial standards like ANSI, BS, DIN and JIS. SKF Oil Field Chains are American Petroleum Institute (API) approved and each box c arries the API monogram. SKF automotive chains meets the ISO/TS16949 Quality Assurance System technical specification. This specification aligns American (QS-9000), German (VDA6.1), French (EAQF) and the Italian (AVSQ) automotive quality system standards within the global automotive industry. All SKF chains,...

Raw material The raw materials used to manufacture each component of the chain must meet very stringent specifications. As a result, there are very tight controls over all incoming materials. These controls range from carefully selecting the steel mills to regular material audits. Every shipment of raw material must include a laboratory report certifying the material composition of the steel. In addition, samples are thoroughly tested to confirm that the steel meets all specifications. After stringent inspections, the steel undergoes the pre-production process, which starts with annealing. Annealing...

The manufacturing process Outer and inner plate Raw material inspection and testing Cold rolling and machining Cold heading and cutting Deburr and check all critical dimensions Check all critical dimensions (e.g. diameter, length) Check all critical dimensions (e.g. height, outer- and inner diameter) Heat treatment Check hardness and tensile strength Check hardness (and case depth if applicable) Check surface hardness and case depth Check hardness (and case depth if applicable) Surface finishing Shot peening Inspect surface appearance and ball swaging Check all critical dimensions (e.g. diameter)...

Chain parts Inner plate Outer plate Roller Link plates (inner and outer plates) The shape of inner and outer plates on SKF chains have been adopted to a wider waist link plate design. This provides an increase in fatigue strength. By subjecting the raw material to a series of cold rolling processes and stringent thickness controls, the plates achieve uniform thicknesses which are critical to a smooth running chain. The plates endurance and strength is fully optimized via thru-hardening, shot peening and an aperture ball-burnishing process. Shot peening improves fatigue strength and crack resistance...

Pins Pins are made from alloy steel that has been case hardened in rotary furnaces. These furnaces provide an even heat for a consistent and uniform case depth, which helps to resist damage from shock loads and provide maximum wear resistance. Rotary furnaces used in the heat treatment process provide a uniform heat for a more consistent and uniform result Pins are precision ground to enhance wear resistance and increase chain service life Bushings Cold rolling provides a uniform wall thickness which is extremely important in achieving a precise and consistent pitch. Precision curling units offer...

SKF chains use solid rollers that are cold-drawn from bar stock to improve fatigue strength and resist the damaging effects of shock loads. All rollers go through a hardening process to improve wear resistance and increase service life. To reduce cracking, the rollers undergo shot peening which significantly improves fatigue strength. Parts manufacturing lines Assembly process The automated assembly process rejects parts that do not meet, fit or tolerance specifications, giving SKF chains a precisely spaced pitch and a near perfect fit. Every part and process is subject to tight quality controls...

Connecting links These links are used to connect two ends of a chain together. Both the spring clip and cotter pin type can be disassembled and replaced easily. The riveted type provides a very strong link, and has a similar fatigue strength as the other links in the chain. Connecting link (spring clip type) Table 1 Standard connecting links Chain number ANSI 25-1 Spring clip Spring clip Spring clip Spring clip Spring clip Spring clip Spring clip Connecting link riveted type is also available on request. Connecting link (cotter pin type) Connecting link (riveted type)

Offset links Offset links are used when an odd number of pitches are required in a chain. These links consist of two cranked plates which are press fitted onto a bush and roller. The wide end is placed over the last link in the chain and a connecting pin is installed and secured with a split pin. NOTE: It should be noted the use of the offset link de-rates the capacity of the standard transmission chain, particularly the use of the one pitch off-set link. Off-set links should avoided on higher speed applications, shockloaded drives, and only be used where set centres are required, and no other...

Chain selection procedure and design guidelines The following is a general guideline for the selection of roller transmission chains, whether DIN/BS or ANSI. Information required For correct selection, as much of the following information should be supplied • Power (kW or HP) or torque • Type of prime mover (e.g. electric motor, I.C. engine etc..) • Type of DriveN equipment – Hours of operation – Type of loading / environment / duty etc • Speeds (dR and dN) or one speed and the ratio • Centre distance (nominal) usually between 30 – 80 pitches Service factors Application service factor (Fa) •...