Products

For the bearings in motors that are used irregularly, such as the motors for power windows, it is necessary to form an oil film between the shaft and the bearing instantaneously, even during unstable operation while maintaining sliding performance, as well as to supply reliable material at low cost for severe low speed and high load use conditions. By focusing air permeability and pores on the surface that lead to the formation of oil films to optimize the materials, we successfully developed highly durable, reliable, and cost-effective material.

Starter motors start engines. The motor section is designed to rotate at high speeds to generate high torque. In recent years, the need for smaller size and lighter weight has been increasing more than ever before, and oil-impregnated sintered bearings that can withstand high-speed rotation and high torque are required to ensure superior sliding performance, wear resistance, and reliability. Different types of oil-impregnated sintered bearings, such as bearings supporting an armature (a rotating part of an electricity generator with a wire wound around the core), bearings for planetary gears, bearings for the output section, are used in combination in a starter motor, and many of our bearing products are used.

Wiper motors secure visibility by eliminating raindrops and snow from windshields. Because any stoppage due to failure could lead to a major accident, high reliability and wear-resistant materials are required. In addition, because of the need for a decrease in weight and size and the high torque applied to the bearings, high-strength materials are necessary. We offer wear-resistant and high-strength material for oil-impregnated sintered bearings and also provide many bearings for wiper motors.

Exhaust gas recirculation (EGR) returns part of the exhaust gas from an automobile engine to a combustion chamber; this system is in widespread use to reduce NOx and fuel consumption. The bush for EGR is used for the valves that lead part of the exhaust gas to the intake air side and is used in an exhaust gas environment with a wide temperature range from ambient temperature to high temperatures where lubricants cannot be used. Therefore, we have realized material with superior self-lubricating property at high temperatures and oxidation resistance by adding a large amount of solid lubricant to the bearing material, which contribute to a reduction in NOx emitted and the fuel consumption of automobiles.

Although sintered bearings are generally press-fit into housings for use, housings are increasingly resinified and associated with the reduction in costs and the weight of motors. As a result, the need for sintered bearings that are suitable for resin inserts has been increasing. Because resin inserts have lower fastening power compared to press-fitting, it is necessary to implement measures to prevent the bearings with such inserts from rotating and falling out the thrust direction.
In the typical examples of bearings that have already been put into practical use, grooves were formed in the axial direction on the outer periphery of the bearings to prevent rotation, and grooves were also machined in the circumferential direction on the outer periphery to prevent falling out in the thrust direction. Although a reduction in costs was one of the purposes of the resinification of housings, a significant increase in bearing prices due to machining was a problem for customers. Therefore, we developed sintered bearings suitable for resin inserts that are formed in the process to prevent rotation and falling out in the thrust direction without any machining by using our unique forming technique. These bearings are increasingly used each year and contribute to cost reductions by customers.

Our bearings can be used for rotating shaft and as sliding materials.