Power transmission device
AssigneeDenso Corporation
InventorsMichiyasu Nosaka, Kiyoshi Kurohata
Life of this patent
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Abstract
A power transmission device which interrupts torque transmission when the torque exceeds a predetermined torque. A torque limiter includes projections formed on a center hub and a pulley. The center hub includes bridges that transmit torque by a pulling force. When a preset torque limit is reached, the projections on the center hub make contact with and move along slanted faces so as to move the center hub in an axial direction relative to the pulley. The bridges are thereby subjected to a bending moment in addition to the pulling force when the torque exceeds the preset torque level, so that the bridges break precisely above the preset torque level due to the reduced fatigue limit.
Claims7
A power transmission device for transmitting power generated by a drive source to a driven device, comprising:
- a breakable part which breaks and interrupts torque transmission when the transmitted torque exceeds a predetermined torque level;
- and
- means for inducing breakage that applies a force to said breakable part in a different direction when the transmitted torque exceeds the predetermined torque level from that of a force applied to said breakable part when the transmitted torque is within the predetermined torque level.
A power transmission device for transmitting power generated by a drive source to a driven device, comprising:
- a driving-source rotating member driven to rotate by torque transmitted from said drive source;
- a driven-device rotating member operatively connected to said driven device to rotate together therewith;
- a torque transmission part for transmitting torque from said driving-source rotating member to said driven-device rotating member, including a driving-source projection formed on said driving-source rotating member, a driven-device projection formed on said driven-device rotating member, and a resilient member interposed between said driving-source projection and said driven-device projection;
- a breakable part which breaks and interrupts torque transmission when the transmitted torque exceeds a predetermined torque level;
- and
- means for inducing breakage that causes bending stress in said breakable part by changing relative positions of said driving-source rotating member and said driven-device rotating member in an axial direction of rotation when a preset limit of phase difference between said driving-source rotating member and said driven-device rotating member is exceeded.
Dependencies are inferred from the claim text.