	US 12,186,850 B2
	Device for damping the vibrations of a spindle of a machine tool, which spindle rotates about an axis of rotation
Ralf Painczyk, Nentershausen (DE); and Jörg Reinhardt, Berka v.d.H. (DE)
Assigned to Präwema Antriebstechnik GmbH, Eschwege/Werra (DE)
Filed by Präwema Antriebstechnik GmbH, Eschwege/Werra (DE)
Filed on Sep. 14, 2021, as Appl. No. 17/474,137.
Claims priority of application No. 10 2020 124 019 (DE), filed on Sep. 15, 2020.
Prior Publication US 2022/0080544 A1, Mar. 17, 2022
Int. Cl. F16F 7/104 (2006.01); B23G 11/00 (2006.01); B23Q 1/70 (2006.01); B23Q 11/00 (2006.01); F16F 5/00 (2006.01); F16F 9/10 (2006.01); F16F 9/12 (2006.01); F16F 9/53 (2006.01)

CPC B23Q 11/0032 (2013.01) [B23Q 1/70 (2013.01); F16F 5/00 (2013.01); F16F 9/10 (2013.01); F16F 9/53 (2013.01); F16F 2224/048 (2013.01)]

14 Claims

1. A device for damping the vibrations of a spindle of a machine tool, which spindle rotates about an axis of rotation, wherein the device has a central longitudinal axis oriented coaxial to the axis of rotation of the spindle during use, as well as

a housing that is provided for coupling to the spindle in a torque-proof manner, and encloses a ring-shaped housing space that is configured as a ring space oriented coaxial to the central longitudinal axis and surrounds the central longitudinal axis,

a ring-shaped damper mass that is arranged in the housing space so as to be movable relative to the central longitudinal axis, and is oriented coaxial to the central longitudinal axis in the rest state,

and

comprises at least one spring element, by way of which the damper mass is movably held on the housing with elastic resilience, with reference to the central longitudinal axis of the device, at least in the circumference direction of the damper mass,

wherein

a gap is present between a circumference surface of the damper mass and an inner surface of the housing, which gap is filled with a viscous damper fluid, and that the clear width of the gap filled with the viscous fluid is adjustable.