US 11,872,630 B2
Method for producing a camshaft adjuster
Alexander Mueller, Altmuenster (AT); Karl Dickinger, Vorchdorf (AT); and Wolfgang Siessl, Traunkirchen (AT)
Assigned to Miba Sinter Austria Gmbh, Laakirchen (AT)
Filed by Miba Sinter Austria GmbH, Laakirchen (AT)
Filed on Jan. 11, 2021, as Appl. No. 17/145,525.
Claims priority of application No. A 50093/2020 (AT), filed on Feb. 7, 2020.
Prior Publication US 2021/0246813 A1, Aug. 12, 2021
Int. Cl. B22F 5/08 (2006.01); F01L 1/344 (2006.01); F01L 1/047 (2006.01); B22F 3/16 (2006.01); B22F 5/00 (2006.01); B22F 3/10 (2006.01)
CPC B22F 5/08 (2013.01) [B22F 3/10 (2013.01); B22F 3/162 (2013.01); B22F 5/00 (2013.01); F01L 1/047 (2013.01); F01L 1/3442 (2013.01); B22F 2998/10 (2013.01); F01L 2001/34426 (2013.01); F01L 2303/00 (2020.05)] 7 Claims
OG exemplary drawing
 
1. A method without a calibration step for producing a hydraulic camshaft adjuster, comprising
a stator with a stator base body, which is produced with an external spur gearing, a radially internal lateral surface and with webs protruding radially inwards from the radially internal lateral surface, wherein the webs are distanced from one another in a circumferential direction of the stator base body, and wherein the stator base body is produced with a stator base body radial fitting surface for contacting a camshaft;
a rotor being rotatable relative to the stator and having a rotor base body, which is at least partially surrounded by the stator and which is produced with blades protruding radially outwards from a radially external lateral surface, so that multiple hydraulic working spaces are formed between the stator and the rotor, each of which working spaces being subdivided into a first working chamber and a second working chamber by a blade of the rotor; and
a control valve which is arranged so as to be at least partially surrounded by the rotor;
wherein the control valve is produced with a sealing surface on an external lateral surface;
wherein the rotor base body is further produced having a recess for the control valve, and the recess is produced having a fitting surface for the sealing surface;
wherein the rotor base body is further produced having a rotor base body radial fitting surface for contacting the camshaft; and
wherein at least one of the rotor and the stator is produced according to a powder-metallurgical process, comprising the method steps of:
providing a first powder for producing the rotor;
pressing the first powder to form a rotor green compact;
sintering the rotor green compact;
and/or
comprising the method steps:
providing a second powder for producing the stator;
pressing the second powder to form a stator green compact;
sintering the stator green compact;
wherein the stator in the region of the stator base body radial fitting surface of the stator base body for contacting the camshaft and/or the rotor in the region of the rotor base body radial fitting surface of the rotor base body for contacting the camshaft and/or in the region of the fitting surface for contacting the sealing surface of the control valve and/or the control valve in the region of the sealing surface is or are produced with a tolerance, so that a clearance fit with a maximum clearance of 100 μm or a press fit is formed
between a first surface comprising the stator base body fitting surface for the camshaft and a second surface comprising an external lateral surface of the camshaft and/or
between a first surface comprising the rotor base body fitting surface for the camshaft and a second surface comprising an external lateral surface of the camshaft;
wherein for forming the press fit, at least one of the first and second surfaces is produced having an excess in the region of the press fit between the first and second surfaces.