V-belt XPB 3550 - 17x14MM - PIX X'tra ®

V-belt XPB 3550 - 17x14 MM - PIX X'tra ® – PIX X'tra® narrow V-belt for stable power transmission

V-belt XPB 3550 - 17x14 MM - PIX X'tra ® is a relevant belt type for mechanical power transmission where a flexible, Cogged V-belts with clear length data is desired. The product is listed as XPB with the goal 17x14MM and the lengths L 3490 mm, Length 3550 mm and Width 3578 mm.

XPB is a stronger timing narrow V-belt, which is often used when more power needs to be transmitted than in the smaller XPZ and XPA profiles. The belt is particularly relevant for more powerful belt drives, where the motor, pu , fan, compressor or process machine requires a wider contact surface. The correct cross-section is essential for the sides of the belt to grip the pulley properly and can transmit the torque without unnecessary slip.

Product data

• Profile: XPB
• Goal: 17x14MM
• Effective length: Length 3550 mm
• Inner length: L 3490 mm
• External length: Width 3578 mm
• Series: PIX X'tra® Molded Raw Edge Cogged Belts
• Construction: raw edge and Cogged V-belts
• Profile angle according to PIX data sheet: 36° ± 1°
• Mark: PIX

Length specifications

The Ld dimension is the effective length and the length specification typically used for narrow V-belts. Li describes the inner length, while La describes the outer length. The three dimensions must be understood together with the profile, cross-section and pulley grooves, because the length designation alone does not describe the full geometry of the belt.

The three length specifications describe the belt's geometry from each measurement position. L 3490 mm describes the inner length, Length 3550 mm is the effective length, and Width 3578 mm is the outer length. The difference between them is due to the geometry of the belt and the measurement method. Therefore, belts with almost the same outer dimensions can still have different technical specifications.

With Ld 3550 mm, the belt is a very long variant in this product group. Long belts require special attention to alignment, correct tensioning and the quality of the pulleys, because small deviations can propagate over a larger belt length.

Construction and technical features of PIX X'tra®

The raw edge construction means that the sides of the belt are designed for direct contact with the pulley. The serrated underside makes the belt more compliant around pulleys, especially where the diameter is limited. PIX also specifies polyester cord as a tensile member, which is relevant for longitudinal stability and load capacity in a correctly dimensioned belt drive.

PIX states for the X'tra® series a power transmission capacity of 15–20% over wrapped belts in comparable operating conditions. The data sheet also highlights better flexibility, approximately 20% higher heat dissipation than wrapped belts, possibility of smaller pulleys in compact drives, maximum linear belt speed up to 42 m/s, antistatic design, oil and heat resistance, REACH/RoHS compliance and temperature range from -45°C to +120°C.

For the XPB profile, the PIX data sheet states the length range is 550–8380 mm. This belt with Ld 3550 mm is in the range 3001–8380 mm, where the data sheet states a length tolerance of ±8 mm and a set tolerance of 4 mm. The tolerances are relevant when replacing, especially if several belts are to run in parallel or if the center distance can only be adjusted to a limited extent.

Use for the XPB profile

The operating situation has a great impact on the belt's lifespan: is the belt running constantly, are there many starts/stops, is the load even, and are the pulleys clean and in good condition? This XPB belt is designed for mechanical power transmission, but lifespan and operation still depend on alignment, tension, temperature, pulley quality, and whether the belt is installed without damage.

This XPB belt is relevant in medium and heavier applications where an XPZ or XPA profile does not provide sufficient bearing surface for the current belt drive. In operation, the pulley groove, the belt cross-section and the timing construction are important for the contact between the belt and pulley. Profile and length must match, as the correct length does not compensate for an incorrect cross-section.

Profile and pulley compatibility

XPB belongs to the same narrow profile family as SPB, but the belt has its own technical specification with a timing, raw-edge construction. The belt works with side contact in the pulley groove, and the correct groove profile is necessary for the contact surface, friction and load to be distributed correctly. Incorrect cross-section or skewed pulleys can cause overheating, noise, slippage and uneven wear.

The technical identification consists of the combination XPB, 17x14MM, Length 3550 mm, L 3490 mm, Width 3578 mm and PIX X'tra®The combination distinguishes the item from nearby V-belts with other profiles, other length standards or a different construction.

Installation and operation

When installing, the belt should be placed without being twisted or forced over the pulley with a screwdriver or other sharp tool. Instead, adjust the center distance or loosen the relevant tensioning device so that the belt can be installed without damage. After installation, the belt should have the tension that the machine is designed for, because both too loose and too tight a belt can cause problems.

A new belt should be installed in clean, dry and undamaged pulleys. Oil, old belt dust, rust or sharp edges can shorten the life. Alignment between the pulleys is also important. Even a good belt can quickly wear out if the pulleys are misaligned or if the belt is forced to work sideways.

Avoid using belt spray as a permanent solution to slippage. Slippage is often caused by incorrect tension, worn pulleys, oil contamination or incorrect belt specification. A properly specified XPB belt of the correct length and in a clean, aligned belt drive is a more durable solution than temporary remedies.

The XPB profile with the dimensions 17x14 MM is part of the narrow Cogged V-belts, where the fit of the side surfaces in the pulley groove is crucial for the power transmission. Ld 3550 mm describes the effective length, while Li 3490 mm and La 3578 mm describe the inner and outer measurement line of the belt. Together, the dimensions give a more precise picture of the belt geometry than the length alone. The technical structure is therefore relevant in both new and established belt drives.

For the XPB 3550, a clean and smooth contact between the belt and pulley is an essential part of the overall function. The belt path should be free of oil, sharp edges and accumulated belt dust, as these conditions can affect friction, temperature and wear pattern.

Technical questions about XPB V-belts

What does XPB 3550 mean on this belt?

XPB is the profile designation and 3550 refers to the effective length Ld in millimeters. For this item, this means that the belt is specified as XPB profile with dimensions 17x14 MM, Li 3490 mm, Ld 3550 mm and La 3578 mm.

Why does a new V-belt get hot?

Heat is often caused by incorrect tension, misaligned pulleys, worn grooves, excessive load or incorrect profile. A correctly specified belt can still have a short life if the belt drive is not adjusted correctly.

Is external length the same as effective length?

No. La is the external length, while Ld is the effective length. They must not be mixed up because the difference may be enough to prevent the belt from being tensioned correctly.

What conditions affect the operation of the belt?

Profile, dimensions, Ld, Li, La, pulley groove, number of belts in the drive and machine operation all affect the load on the belt. When these conditions match, the belt works more stably and has a longer service life.

What do Ld, Li and La mean on this V-belt?

Ld is the effective length and is the length stated in the product name. Li is the inside length, and La is the outside length. The three measurements are used to compare belts because manufacturers and older belt markings do not always use the same length designation.

Is the length alone enough to describe the belt?

No. The length is important, but the profile is at least as important. A belt with the correct length but the wrong profile can lie incorrectly in the pulley, causing poor contact, heat, noise and a shorter life.

When making technical comparisons, length, profile, cross-section and the product's Li, Ld and La should be viewed together. This makes the difference between internal, effective and external length clear and reduces the risk of confusion between adjacent belt sizes.

Short conclusion: V-belt XPB 3550 - 17x14 MM - PIX X'tra ® is an XPB V-belt from PIX X'tra® with dimensions 17x14 MM, Ld 3550 mm, Li 3490 mm and La 3578 mm. It is a relevant belt type when the belt drive requires this particular profile and a rough-edged, timing construction with the technical properties that PIX specifies for the X'tra® series.