Fan clutch
AssigneeIna Walzlager Schaeffler oHG
InventorsJoachim Ritter, Johann Stark
Life of this patent
Estimating the term…
Abstract
A fan rotor (7) for an electromagnetic fan clutch is mounted on a drive shaft (1) with the help of a three-ring bearing (8) so that three different speeds of rotation of the fan rotor (7) can be obtained. To reduce wear, especially in the presence of impact loads and oscillatory movements of the three-ring bearing (8), this three-ring bearing (8) is configured so that different materials are paired with each other in regions of rolling contact.
Claims7
An electromagnetic fan clutch for an internal combustion engine, said fan clutch comprising a drive shaft retained in a housing by spaced first rolling bearings, said drive shaft being connected at one end to a fan rotor by a second rolling bearing that is configured as a three-ring bearing having an inner ring, an intermediate ring an outer ring and rows of rolling elements arranged between said rings, the inner ring being firmly connected to the drive shaft, the outer ring being firmly connected to the fan rotor, the intermediate ring being adapted to be coupled to the drive shaft by a first electromagnetic clutch and the outer ring being adapted to be coupled to the drive shaft by a second electromagnetic clutch, and at least in the second rolling bearing, different materials being paired with each other in regions of rolling contact, wherein at least one of a row of rolling elements between the intermediate ring and the outer ring comprises a wear-resistant hard coating.
An electromagnetic fan clutch for an internal combustion engine, said fan clutch comprising a drive shaft retained in a housing by spaced first rolling bearings, said drive shaft being connected at one end to a fan rotor by a second rolling bearing that is configured as a three-ring bearing having an inner, an intermediate ring and an outer ring and rows of rolling elements arranged between said rings, the inner ring being firmly connected to the fan rotor, the intermediate ring bearing adapted to be coupled to the drive shaft by a first electromagnetic clutch and the outer ring being adapted to be coupled to the drive shaft by a second electromagnetic clutch, and at least in the second rolling bearing, different materials being paired with each other in regions of rolling contact, wherein a raceway of the inner ring and an inner raceway of the intermediate ring comprise a wear-resistant hard coating.
An electromagnetic fan clutch for an internal combustion engine, said fan clutch comprising a drive shaft retained in a housing by spaced-apart first rolling bearings, said drive shaft being connected at one end to a fan rotor by a second rolling bearing that is configured as a three-ring bearing having an inner ring, an intermediate ring and an outer ring and rows of rolling elements arranged between said rings, the inner ring being firmly connected to the fan rotor, the intermediate ring being adapted to be coupled to the drive shaft by a electromagnetic clutch and the outer ring being adapted to be coupled to the drive shaft by a second electromagnetic clutch, at least the second rolling bearing being filled with a solid lubricant which may be filled in a carrier substance wherein the carrier substance is a lithium soap grease on a mineral oil base.
Dependencies are inferred from the claim text.