Patent ID: 8517843

Claim:
A torque limiting device for limiting power transmission thereby protecting an engine and a driven apparatus, the torque limiting device comprising: a flywheel that is of an approximately circular disc shape and acts as a power output part of the engine; a clutch disc clamp plate that is of a ring shape, having a surface area that is pressed to an outer area surface of the flywheel, the clutch disc clamp plate being provided with: an opening at a center part of the clutch disc clamp plate; and a concave space formed between the clutch disc clamp plate and the flywheel when the clutch disc clamp plate is fastened to the fly wheel; a clutch disc that is fitted in the concave space, and connected to the driven apparatus; a clutch pressing plate that is fitted between the clutch disc and the flywheel; and at least one pressing means that is an elastic member fitted to and in the flywheel for pressing the clutch pressing plate so that the contact pressure on the surface of the clutch pressing plate is uniformly distributed, wherein the clutch disc is held between the flywheel and the clutch disc clamp plate by use of the pressing force of the pressing means, and wherein the clutch disc clamp plate includes, an inner wall face which is tapered and facing the clutch disc, such that a width of the concave space in a rotation axis direction of the flywheel becomes narrower from an outer periphery side toward a rotation axis side in a pressing force free condition, an outer wall face at a circumference of the opening at the center part of the clutch disc clamp plate, the outer wall face being a wall face opposite to the inner wall face, and a flange part of a ring shape provided on the outer wall face of the clutch disc clamp plate, the flange part being formed so as to protrude in a direction toward the transmission along an entire circumference of the opening.