Needle holder components is a kind of high load capacity and high rigidity design of the independent bearing unit. Particularly applicable to the shaft and the air can be directly used as rolling, radial dimension restricted components. Since each needle by the retainer to accurately guide and maintain its high speed, more outstanding performance.
K needle holder components
K * * * ZW double row needle holder components
Needle holder components into separate and double row two series. When in installation of crankshaft occasions when difficulties arise, may also provide some type structure. In general the M type punching holder, and the metal solid cage, glass fiber reinforced nylon 66 holder two. Glass fiber reinforced nylon 66 retainer can be at 120 degrees C temperature for a long time working, short time can be used to 150 DEG C.
When more than two bearing in parallel on the same shaft when in use, the needle must belong to the same group value. Cage width tolerance Bc - 0.2 / 0.55mm.
Precision grade needle diameter tolerance
G2 0 ~ - 2 - 2 - 4 - 4 - 6
G3 0 ~ - 2 - 2 - 4 - 4 - 6
Needle holder components in the radial clearance, depending on the inner and outer raceway and roller machining precision. According to different conditions of use of recommended mix.
Conditions of use / shaft tolerance diameter < 80 > 80 \ axis recommended tolerance
High speed high precision J5 H5
General conditions of use H5 G5
High temperature or assembly error in G6 F6
When the needle directly on the shaft or the casing running, in order to make the needle holder components to achieve full load capacity, internal and external raceway surface hardness must be less than or equal to 0.32um 58--62HRC, roughness, surface quality and rolling bearing raceway must be the same.
Assembly and related dimensions
Needle holder components assembly size, when used in high speed condition, the holder and the axial spacing between should add a heat-treated washers, to avoid direct contact with the spacing retainer.