Described is a low profile rotary damper assembly having a rotor, an annular seal, a housing, a bearing plate, and a gear. The rotor includes a shaft portion integrally formed with a body portion. The shaft portion defines an engagement interface at a distal end thereof. The annular seal is configured to surround at least a portion of the shaft portion. The housing defines an opening and a rotor cavity, wherein the housing is configured to rotatably support the rotor. The bearing plate is coupled to the housing and is configured to seal the opening. The bearing plate includes an annular shoulder defining an aperture and a convex cap defining a seal cavity for the annular seal between the body portion and an interior surface of the convex cap. The shaft portion extends axially outwardly through the aperture. The gear is coupled to the rotor via an opening that is configured to receive the engagement interface. The gear is shaped with a generally concave cavity that is sized and shaped to receive the collar and at least a portion of the convex cap.

Rotary dampers and systems for use and installation within a rotary winged aircraft, and related methods, are provided herein. In some aspects, a rotary damper includes a housing having a rotor assembly positioned inside the housing. The rotary damper may further include at least one resilient member disposed adjacent to an outer portion of the housing. The at least one resilient member is externally visible from outside of the rotary damper. In some aspects, the resilient member includes a torsional spring of the rotary damper. In certain aspects, the resilient member is disk shaped and slidable within a portion of the rotary damper. In some aspects, at least one primary liquid orifice is provided in a portion of the at least one rotor member. In some aspects, at least one pressure equalization port is disposed within a portion of the rotor assembly.

A torque fluctuation absorbing apparatus is capable of securely sealing a space housing an elastic member even on application of a centrifugal force or at the time of cooling. The torque fluctuation absorbing apparatus includes a center plate, a side plate(s) (side plate assembly) coaxial with the center plate and slidably relative to the center plate, and an elastic member housed within a space delimited by the side plate assembly to absorb torque fluctuations between the side plate assembly and the center plate. The apparatus also includes a cover member secured to the center plate and slidably pressure contacted with the side plate assembly to cover from outside a space housing the elastic member, and a suppressing section capable of suppressing the cover member from deforming under a pressure acting on the cover member when atmospheric pressure within the space housing the elastic member(s) becomes lower than outside atmospheric pressure.

Described is a low profile rotary damper assembly having a rotor, an annular seal, a housing, a bearing plate, and a gear. The rotor includes a shaft portion integrally formed with a body portion. The shaft portion defines an engagement interface at a distal end thereof. The annular seal is configured to surround at least a portion of the shaft portion. The housing defines an opening and a rotor cavity, wherein the housing is configured to rotatably support the rotor. The bearing plate is coupled to the housing and is configured to seal the opening. The bearing plate includes an annular shoulder defining an aperture and a convex cap defining a seal cavity for the annular seal between the body portion and an interior surface of the convex cap. The shaft portion extends axially outwardly through the aperture. The gear is coupled to the rotor via an opening that is configured to receive the engagement interface. The gear is shaped with a generally concave cavity that is sized and shaped to receive the collar and at least a portion of the convex cap.

A torsional vibration damper has a hub part (primary mass) that is able to be fastened to a driveshaft of a motor, and an inertia ring (secondary mass) that surrounds the hub part in the radially outer region, wherein a fluid-filled gap and sealing devices, by which the escape of the fluid is intended to be avoided, are provided between the hub part and inertia ring. The sealing devices each have a first ring, tightly connected to the hub part, and each have a second ring, tightly connected to the inertia ring, and each have a sealing element made of an elastomer, which is connected in each case sealingly to the first ring on one side and in each case to the second ring on the other side. The damper is configured such that the respective sealing element has been vulcanized onto a respective external axial side of the first and second ring by fastening portions.