US 11,738,394 B2
Hydraulic expanding chuck
Gilbert Kleiner, Inzigkofen (DE)
Assigned to Guehring KG, Albstadt (DE)
Filed by Guehring KG, Albstadt (DE)
Filed on Feb. 22, 2021, as Appl. No. 17/181,032.
Application 17/181,032 is a continuation of application No. PCT/EP2019/072495, filed on Aug. 22, 2019.
Prior Publication US 2021/0323078 A1, Oct. 21, 2021
Int. Cl. B23B 31/30 (2006.01)
CPC B23B 31/305 (2013.01) [B23B 31/302 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A hydraulic expanding chuck for receiving and clamping a tool shank, comprising:
a main body;
a clamping section that extends along a longitudinal central axis of the expanding chuck, the clamping section having a clamping part lying in a neck region, in which are formed a central receiving opening for receiving the tool shank and a chamber system that can be supplied with a fluid pressure, the chamber system comprising at least a first pressure chamber, which in a radial direction is separated from the receiving opening by an expansion wall yielding elastically under the fluid pressure and which can be supplied with the fluid pressure via at least a first axial pressure channel, which proceeds axially from a piston clamping mechanism accommodated in a clamping region of the hydraulic expanding chuck, the first axial pressure channel being spaced radially from the longitudinal central axis by a first distance that is farther than a distance that the first pressure chamber is spaced radially from the longitudinal central axis, wherein, at least in the region that accommodates the piston clamping mechanism, the clamping section is configured and/or machined in such a way that recesses and cavities lying in the region that accommodates the piston clamping mechanism are positioned relative to each other and/or distributed over the circumference so that deformations and/or distortions induced by a pressure buildup while clamping the tool become superposed in the clamping region in such a way that the longitudinal central axis of the neck region remains largely in alignment with the longitudinal central axis of the expanding chuck.