Description
As the pioneer and global market leader in Continuous Variable Transmission (CVT) push-belt technology, BOSCH provides the industry-standard OEM metal push belt engineered for maximum power density, fuel efficiency, and seamless acceleration. Unlike conventional pull-type drive belts, the BOSCH CVT Transmission Metal Push Belt operates on a unique “pushing” force transmission principle: hundreds of micro-engineered, high-hardness steel elements are aligned together and guided by twin sets of high-tensile steel ring packs. Built to withstand immense clamping forces and rapid thermal fluctuations within the variable pulley sheaves, this push belt delivers smooth torque transfer with exceptional resistance to slippage, spalling, and fatigue. Crafted from proprietary automotive-grade maraging steel, the BOSCH CVT Push Belt is the indispensable OE-spec component for transmission rebuilders, remanufacturers, and fleet repair specialists restoring CVT platforms to factory-fresh torque standards and operational quietness.
Technical Parameters
| Category | Specifications & Technical Details |
| Precision Maraging Steel Push Element Architecture | Composed of 400 to 500 micron-level fine-blanked high-hardness maraging steel elements arranged in tight sequence. The push element sides feature extremely high hardness and wear resistance. Under high-pressure conical pulley compression, they efficiently transmit torque through an “element-pushing-element” thrust mode, fundamentally different from traditional tensile belts. |
| Multi-Layer High-Tensile Steel Ring Pack Guide | Two sets of support rings composed of 9 to 12 layers of micron-level high-strength steel rings are nested in the slots on both sides of the push elements. The steel rings undergo surface nitriding treatment and pre-stress strengthening, possessing extremely high tensile strength and cyclic bending fatigue life, providing stable high-speed geometric guidance for the push element array. |
| Micron-Level Friction Side-Contour Optimization | The side face angle of the steel elements contacting the primary / secondary conical pulleys undergoes micron-level precision cutting and polishing treatment. The side friction coefficient is precisely calibrated to ensure no slippage under extremely high hydraulic compression while greatly reducing fluid shear resistance and transmission noise. |
| High-Torque Density & Broad Ratio Coverage | Capable of withstanding engine peak torque exceeding 450 N·m. Supports stepless smooth switching of the transmission across a broad spread ratio range, allowing the engine to always remain in the optimal fuel economy or maximum power output zone. |
| High-Thermal Stability & Shear Resistance | Capable of stable operation in CVT-specific oil environments above 140°C, as well as under enormous centrifugal force and hydraulic compression generated by high-speed rotation. Effectively prevents metal annealing, cracking, or fatigue spalling caused by localized overheating. |
Applicable Car Brands & Models
Common failure indicators include:
Engine Revs Without Acceleration (Slipping): Engine RPM surges during throttle application, but vehicle speed rises slowly due to belt slippage on the pulleys.
Loud Whining, Shuddering, or Grinding Noises: Metallic whining or grinding noises coming from the transmission, caused by worn push element side-surfaces or scored pulley faces.
Diagnostic Trouble Codes (DTCs): Transmission warning lights accompanied by trouble codes such as P0746 (Pressure Control Solenoid Performance) or P0841 (Fluid Pressure Sensor Performance).
Metal Flakes in Transmission Fluid: Excessive fine metallic shrapnel or broken ring fragments found on the magnet during fluid pan removal.
Yes, inspecting the pulleys is essential. If a worn or snapping push belt has scored, grooved, or scratched the primary or secondary pulley faces, installing a new belt on damaged pulleys will cause rapid wear on the new push elements. Transmission specialists strongly recommend resurfacing or replacing damaged pulley sheaves alongside the new belt.
The BOSCH push belt relies on a thin film of specialized CVT fluid to maintain dynamic traction against the smooth steel pulleys while cooling internal components. Contaminated, degraded, or non-spec fluid loses its anti-wear and friction-modifying properties, causing direct metal-to-metal scuffing, rapid friction heat buildup, and sudden belt ring failure.
Each genuine BOSCH CVT Push Belt is pre-coated with protective anti-rust oil, held in proper curvature by an internal structural plastic support frame, and vacuum-sealed in a heavy-duty, moisture-proof polybag. It is then placed inside a shock-resistant BOSCH branded box. Export orders are master-boxed with protective foam inserts and palletized with humidity-resistant stretch film.
