# US 9,038,799 B2 · Driven component with clutch for selective operation of component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,799 B2 - Document ID: US9038799B2 - Status: Granted - Kind: B2 - Application number: 13/877,773 - Filed: 2011-10-04 - Published: 2013-11-28 - Granted: 2015-05-26 - Earliest claimed: 2010-10-04 - Assignees: Litens Automotive Partnership - Applicants: Pierre A. Mevissen; Jacek Stepniak; Roman Tracz; John Danciu; Scott Parsons - Inventors: Pierre A. Mevissen; Jacek Stepniak; Roman Tracz; John Danciu; Scott Parsons - Web page: https://patentgrep.com/patent/US9038799B2 ## CPC - F16D 13/08: with a helical band or equivalent member, which may be built up from linked parts, with more than one turn embracing a drum or the like, with or without an additional clutch actuating the end of the band (F16D13/02 takes precedence; {similar slip couplings F16D7/022; similar clutches electromagnetically actuated F16D27/025, F16D27/105} ; similar free-wheel clutches F16D41/20; similar brakes F16D49/02) - B60K 25/00: Auxiliary drives (arrangement of tyre-inflating pumps mounted on vehicles B60C23/10) - F16D 27/105: with a helical band or equivalent member co-operating with a cylindrical coupling surface - F01P 5/12: Pump-driving arrangements - F16H 55/36: Pulleys (with features essential for adjustment F16H55/52) - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) - F16H: GEARING ## Abstract A component, such as an engine accessory for an automotive engine, that has clutch with a helical clutch coil and an axially movable armature. The helical clutch coil is normally engaged so as to transmit rotary power between a driving member and a driven member. The armature can be moved to apply a force to a tang of the helical clutch coil that causes the helical clutch coil to disengage to an extent where full rotary power is not passed through the clutch to drive the component. ## Claims ### Claim 1 A component comprising: a clutch assembly with a driving member, a driven member, a wrap spring and an actuator, the driving member having a clutch surface and being configured to be coupled to a source of rotary power, the wrap spring comprising a plurality of helical coils, a tang and an engaging portion, at least a portion of the helical coils being engaged to the clutch surface, the tang extending from a first axial end of the wrap spring, the engaging portion being disposed on a second, opposite axial end of the wrap spring, the engaging portion extending over an arc that is less than 360 degrees, the actuator having an electromagnet, which is mounted coaxially about the driving member, and an armature that is axially movable between a first position and a second position, wherein the driven member includes a carrier to which the engaging portion of the wrap spring is rotatably coupled; wherein the wrap spring is configured to transmit rotary power between the driving member and the driven member when the electromagnet is not operated and the armature is in the first position; wherein the driving member is a shaft having an input portion, which is adapted to receive rotary power, and a power transferring portion, the power transferring portion defining the clutch surface; and wherein the clutch assembly further comprises an actuator housing and a bearing assembly, the electromagnet being mounted on the actuator housing, the bearing assembly being mounted to the actuator housing and the input portion and being the sole means for supporting the driving member for rotation relative to the actuator housing, the bearing assembly being disposed at a location that is spaced apart from the power transferring portion axially along a rotational axis of the driving member. ### Claim 2 (depends on 1) The component of claim 1, wherein the at least the portion of the helical coils is configured to grip the clutch surface on their outer circumferential surface. ### Claim 3 (depends on 1) The component of claim 1, wherein the driving member includes a support portion and a bushing is disposed between the driven member and the support portion. ### Claim 4 (depends on 1) The component of claim 1, wherein the at least the portion of the helical coils is configured to grip the clutch surface on their inner circumferential surface. ### Claim 5 (depends on 1) The component of claim 1, wherein the armature frictionally engages the actuator housing when the armature is in the second position. ### Claim 6 (depends on 1) The component of claim 1, wherein the helical coils of the wrap spring are less than 15 mm in diameter. ### Claim 7 (depends on 1) The component of claim 1, wherein the carrier is rotatable relative to the power transferring portion through a predetermined angle. ### Claim 8 (depends on 7) The component of claim 7, wherein the power transferring portion comprises a hub that is fixed to the input portion for common rotation and wherein the carrier is mounted to the hub. ### Claim 9 (depends on 1) The component of claim 1, wherein the bearing assembly comprises a plurality of rows of bearing elements. ### Claim 10 (depends on 9) The component of claim 9, wherein the bearing assembly is a double-row bearing. ### Claim 11 (depends on 10) The component of claim 10, wherein the bearing elements are bearing balls. ### Claim 12 A component comprising: a clutch assembly with a housing, a driving shaft, a first bearing, a wrap spring, an electromagnet, an armature, a driven member and a second bearing, the driving shaft having an input portion, a support portion and a power transferring portion located axially between the input portion and the support portion, the input portion being configured to be coupled to a source of rotary power, the first bearing being mounted to the housing and the input portion to support the driving shaft for rotation about a rotational axis, the power transferring portion extending from the input portion such that the power transferring portion and the support portion are cantilevered, the power transferring portion having a clutch surface, the wrap spring comprising a plurality of helical coils, a tang and an engaging portion, at least a portion of the helical coils being engaged to the clutch surface, the tang extending from a first axial end of the wrap spring, the engaging portion being disposed on a second, opposite axial end of the wrap spring, the engaging portion extending over an arc that is less than 360 degrees, the electromagnet being coupled to the housing coaxially about the driving member, the armature being axially movable between a first position and a second position, the driven member comprising a carrier to which the engaging portion of the wrap spring is rotatably coupled, the second bearing being mounted to the support portion and the driven member such that the driven member is supported by the second bearing for rotation on the support portion; wherein the wrap spring is configured to transmit rotary power between the driving shaft and the driven member when the electromagnet is not operated and the armature is in the first position. ### Claim 13 (depends on 12) The component of claim 12, wherein the clutch surface is an internal surface into which the wrap spring is received. ### Claim 14 (depends on 12) The component of claim 12, wherein the clutch surface is an external surface over which the wrap spring is received. ### Claim 15 (depends on 12) The component of claim 12, wherein the armature frictionally engages the actuator housing when the armature is in the second position. ### Claim 16 (depends on 12) The component of claim 12, wherein the helical coils of the wrap spring are less than 15 mm in diameter. ### Claim 17 (depends on 1) The component of claim 1, wherein the carrier is rotatable relative to the power transferring portion through a predetermined angle. ### Claim 18 (depends on 17) The component of claim 17, wherein the power transferring portion comprises a hub that is fixed to the input portion for common rotation and wherein the carrier is mounted to the hub. ### Claim 19 (depends on 12) The component of claim 12, wherein the first bearing comprises a plurality of rows of bearing elements. ### Claim 20 (depends on 19) The component of claim 19, wherein the first bearing is a double-row bearing. ### Claim 21 (depends on 20) The component of claim 20, wherein the bearing elements are bearing balls.