DIAMET CORPORATION Product Lineup

In automotive motors such as electronic control throttles, in addition to low friction, stable operation at room temperature and noise reduction during low-temperature starts are required. When selecting copper-based materials to enhance performance, balancing material costs can also be a challenge. Daiamet's F339 is a sintered oil-bearing bearing made from iron-copper-based material that increases the copper area ratio of the bearing inner diameter surface without increasing the copper content. It improves friction characteristics compared to the conventional material F336. ■ Material Design Supporting Low Friction ▼ Improved copper area ratio on the surface from the conventional 20-50% to over 80% ▼ Strengthened copper alloy phase with uniform dispersion of graphite in the matrix ▼ Improved static and dynamic friction characteristics at room temperature ■ Performance Required for Automotive Motors ▼ Suppression of startup noise at low temperatures ▼ Material design targeting the sliding characteristics of copper-based materials using iron-copper-based materials ■ Application Examples ▼ Electronic control throttle motors ▼ Power seat motors, EPB motors This can be utilized for selecting bearings for automotive motors that prioritize friction characteristics and quietness during low-temperature starts. Documents summarizing the material structure, copper area ratio, and friction characteristics of F339, as well as more detailed benefits from its introduction and use in automotive motors, can be downloaded from the link below.

The fuel pump bearings continuously rotate while always being immersed in gasoline. Particularly with fuels containing impurities such as sulfur, the challenges in material selection that affect long-term durability are whether "the bearing performance will not degrade due to corrosion" and "whether wear can be minimized even in harsh sliding environments." DIA-MET's B095 is a corrosion-resistant sintered bearing made of a Cu-Ni-P-C alloy, designed for use in sulfur-containing gasoline. Compared to the conventional material B031, it enhances both sulfur resistance and wear resistance. ■ Corrosion resistance to sulfur-containing fuel ▼ Conducted a 200-hour immersion test in sulfur-added gasoline (333K) ▼ B095 maintained a good appearance even under conditions where corrosion was observed with the conventional material B031 ■ Wear resistance ▼ Reduced wear amount in durability tests with a contact pressure of 1.4 N/mm² and a sliding speed of 1.8 m/s ▼ The condition of the counterpart shaft after testing was also good ■ Application examples ▼ Fuel pump Considering the differences in fuel quality, this can be utilized for material selection and design considerations for fuel pump bearings that require measures against both corrosion and wear. Documents summarizing the sulfur resistance and wear resistance tests of B095 compared to conventional materials, as well as more detailed benefits from its introduction and utilization in fuel pumps, can be downloaded from the link below.

The bearings for EGR (Exhaust Gas Recirculation) are used in the valve that directs a portion of the exhaust gas to the intake side, and they are utilized in a wide range of exhaust gas environments, from atmospheric temperatures to high temperatures where lubricating oil cannot be used. Therefore, by adding a large amount of solid lubricants to the bearing material itself, we have achieved a material that excels in self-lubrication at high temperatures and has excellent oxidation resistance, contributing to the reduction of NOx and improved fuel efficiency in automobiles. Please feel free to contact us if you have any inquiries. *For more details, please download the PDF or feel free to contact us.

In the design of inserting bearings into resin parts, the challenges are "how to prevent the bearings from coming out during use" and "how to prevent misalignment in the rotation direction." Adding additional processing for retention and rotation prevention increases the number of processes and leads to higher costs. Daimet's sintered bearings for resin inserts feature a non-through groove on the outer circumference and an outer diameter expansion section formed by molding. This achieves a shape that enhances the fastening force with the insert resin without the need for machining. ■ Shapes for resin inserts ▼ Non-through grooves on the outer circumference formed by molding ▼ An outer diameter expansion section to prevent axial displacement ▼ Outer shape to prevent rotation misalignment ■ Support for irregular inner and outer diameters ▼ Irregularities in the inner or outer diameter achieved through molding ▼ Utilized for preventing shaft rotation in thrust sliding parts ■ Cost reduction ▼ Eliminates additional machining processes, balancing shape formation and cost reduction This can be utilized for rationalizing designs that include fastening with resin and preventing shaft rotation, among other peripheral components. Documents summarizing the shapes and functions of sintered bearings with irregular inner diameters for resin inserts, as well as more detailed benefits of process reduction and enhanced fastening force without machining, can be downloaded below.

In automotive and home appliance motors, there is a challenge to ensure stable sliding performance while also keeping material costs down. In particular, copper-based sintered oil-impregnated bearings are susceptible to fluctuations in copper prices, and reducing the amount of copper used raises concerns about whether friction characteristics will deteriorate during material selection. The Diamet F350 is an iron-copper-based sintered oil-impregnated bearing that achieves a high copper coating rate on the sliding surface while keeping the copper content low by using special copper powder. On the inner diameter surface of the bearing, it maintains a copper content of 15% with a copper surface area ratio of over 30%. ■ Balancing material cost reduction and sliding performance ▼ Material cost ratio of 0.6 compared to the comparative material F336 ▼ Reduction of copper content from 48-52% to 13-17% ▼ Improvement of copper coating rate on the sliding surface through special copper powder ■ Friction characteristics ▼ Maintains friction characteristics equivalent to the comparative material F336 ▼ The bearing itself is impregnated with lubricating oil, exhibiting self-lubricating functionality This can be utilized in the material selection for motor components where there is a desire to reduce copper usage while maintaining bearing performance. Documents summarizing the material composition, copper coating rate, and friction characteristics of the F350, as well as more detailed benefits from material cost reduction and maintenance of sliding performance, can be downloaded from the link below.

When two bearings are arranged with shaft support, challenges arise such as "difficulty in ensuring coaxiality during assembly" and "the desire to reduce the number of parts." On the other hand, long straight bearings can increase the contact area of the inner diameter, leading to greater friction loss. DIA-MET's twin bearing integrates the bearing functions that were traditionally supported by two separate units. By making both ends sliding parts and the central part a relief shape, it maintains the shaft holding length while minimizing the contact area. ■ Integration of two bearings ▼ Improved inner diameter coaxial accuracy through integrated manufacturing ▼ Easier assembly compared to using two separate units ▼ Maintains contact area during assembly with an outer diameter straight shape ■ Reduced friction loss ▼ The central part is designed as a relief shape, reducing the inner diameter contact area ▼ The sliding parts at both ends ensure the shaft holding length ▼ Good pore condition is maintained on the sliding surface ■ Compatibility with small diameters ▼ Can be manufactured with inner diameters from approximately φ10 to φ1.5 The integration of bearings allows for a comprehensive review of the number of parts, assembly efficiency, coaxiality, and friction loss, making it useful for designs that aim to address these aspects. Documents summarizing the structure, inner diameter shape, and comparisons with conventional products of the twin bearing, as well as more detailed benefits of improved assembly efficiency and reduced friction loss due to bearing integration, can be downloaded below.

As equipment becomes more compact, challenges arise such as "the gap between the shaft and housing is narrow, making it impossible to place bearings" and "we want to replace bushings to reduce costs." Balancing space-saving and sliding performance becomes a key point in bearing selection. DIA-MET's thin-walled sintered oil-impregnated bearings can be manufactured with a wall thickness of less than 1mm for both inner and outer diameters. They can be placed in tight spaces while maintaining sliding performance equivalent to that of standard sintered oil-impregnated bearings. ■ Space-saving design through thin-walling ▼ Can be manufactured with a wall thickness of less than 1mm ▼ Can be inserted into a 1mm gap between the shaft and housing ▼ Suitable for narrow spaces where ball bearings are difficult to place ■ Replacement of bushings ▼ Ensures good sliding performance through base material properties and oil impregnation in pores ▼ No sliding treatment required, which is necessary for unlubricated bushings ■ Cost reduction ▼ Net shape forming that does not require machining ▼ Maintains sliding performance equivalent to that of standard sintered oil-impregnated bearings This can be utilized in the bearing design of equipment aimed at miniaturization and reducing component costs. Documents comparing thin-walled bearings with bushings and ball bearings, as well as more detailed benefits from space-saving and cost reduction, can be downloaded from the link below.