	US 12,109,849 B2
	Rotary transmission device for transmitting control and/or working pressures to a wheel hub or a vehicle wheel received by the wheel hub
Eva Tritschler, Bodman-Ludwigshafen (DE); Christiane Schwarz, Pfullendorg (DE); Roland Braun, Herdwangen-Schonach (DE); Henry Klemm, Überlingen (DE); Martin Spindler, Herdwangen-Schonach (DE); and Bruno Schulze Selting, Rielasingen-Worblingen (DE)
Assigned to Illinois Tool Works Inc., Glenview, IL (US)
Appl. No. 16/965,219
Filed by ILLINOIS TOOL WORKS INC., Glenview, IL (US); and KT PROJEKTENTWICKLUNGS GMBH, Untergruppenbach (DE)
PCT Filed Jan. 28, 2019, PCT No. PCT/US2019/015376 § 371(c)(1), (2) Date Jul. 27, 2020, PCT Pub. No. WO2019/148079, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 10 2018 000 636.1 (DE), filed on Jan. 26, 2018; and application No. 10 2018 130 307.6 (DE), filed on Nov. 29, 2018.
Prior Publication US 2022/0227186 A1, Jul. 21, 2022
Int. Cl. B60C 23/00 (2006.01)

CPC B60C 23/00372 (2020.05) [B60C 23/00318 (2020.05); B60C 23/00345 (2020.05); B60C 23/00354 (2020.05); B60C 23/00363 (2020.05)]

21 Claims

1. A rotary transmission device for transmitting control and/or working pressures to a wheel hub or a vehicle wheel received by the wheel hub, wherein the rotary transmission device has a housing structure in which a piston element is displaceable between a first position and a second position relative to the housing structure and relative to a running body of the wheel hub which is mounted so as to rotate about a wheel axis relative to the housing structure, wherein to transmit the control and/or working pressures, at least one pressure medium channel is formed in the piston element, wherein in the first position of the piston element, an air gap is present between an end face of the piston element on a running body side and an end face of the running body on a piston element side, while in the second position of the piston element, no air gap is present between the end face of the piston element on the running body side and the end face of the running body on the piston element side, and the at least one pressure medium channel of the piston element opens in sealed fashion into at least one pressure medium channel formed in the running body;

wherein the housing structure has at least one pressure medium port via which control and/or working pressures can be supplied to the at least one pressure medium channel formed in the piston element, and wherein, at least in a state in which the piston element is in its second position, a pressure medium distribution channel is present between an end face of the piston element opposite an end face of the piston element on the running body side and an inner wall of the housing structure, into which channel the at least one pressure medium port opens, wherein the piston element is movable relative to the housing structure and relative to the running body by application of a corresponding control pressure, wherein the corresponding control pressure is different from the control and/or working pressure to be transmitted, wherein the housing structure has a control pressure port via which the corresponding control pressure is provided for supply and discharge to and from a control chamber assigned to the piston element.