US 11,703,049 B2
Gerotor pump with pressure equalization
Tilo Schaefer, Daubach (DE); Uwe Becker, Butzbach (DE); and Bernd Denfeld, Bad Homburg (DE)
Assigned to Hanon Systems Bad Homburg GmbH, Bad Homburg V. D. Höhe (DE)
Filed by Hanon Systems Bad Homburg GmbH, Bad Homburg V. D. Höhe (DE)
Filed on Jul. 15, 2022, as Appl. No. 17/865,796.
Application 17/865,796 is a division of application No. 16/570,128, filed on Sep. 13, 2019, granted, now 11,428,221.
Claims priority of application No. 102018215713.8 (DE), filed on Sep. 14, 2018; and application No. 102019200560.8 (DE), filed on Jan. 17, 2019.
Prior Publication US 2022/0349401 A1, Nov. 3, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F04C 2/10 (2006.01); F04C 29/04 (2006.01); F04C 15/00 (2006.01)
CPC F04C 2/102 (2013.01) [F04C 15/0046 (2013.01); F04C 15/0096 (2013.01); F04C 29/04 (2013.01); F04C 29/047 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A gerotor pump comprising:
a housing;
a flange which closes the housing to define a compartment;
an inner rotor;
an outer rotor in driving engagement with the inner rotor, the inner rotor and the outer rotor being positioned within the compartment;
an electric drive positioned within the compartment and including an electric rotor fixed for rotation with the outer rotor, the outer rotor being arranged on a shaft that is supported for rotation within the compartment, a first end of the outer rotor being positioned against the flange, the gerotor pump including a suction region and a pressure region, wherein medium within the pressure region is at a higher pressure than medium within the suction region and the compartment;
a gap between the flange and the inner and outer rotors allowing medium in the pressure region to enter the compartment; and
a cavity in the shaft in fluid communication with the suction region and in fluid communication with the compartment.
 
3. A gerotor pump comprising:
a housing;
a flange which closes the housing to define a compartment;
an inner rotor;
an outer rotor in driving engagement with the inner rotor, the inner rotor and the outer rotor being positioned within the compartment;
an electric drive positioned within the compartment and including an electric rotor fixed for rotation with the outer rotor, the outer rotor being arranged on a shaft that is supported for rotation within the compartment, a first end of the outer rotor being positioned against the flange, the gerotor pump including a suction region and a pressure region, wherein medium within the pressure region is at a higher pressure than medium within the suction region and the compartment;
a gap between the flange and the inner and outer rotors allowing medium in the pressure region to enter the compartment; and
a cavity in the shaft in fluid communication with the compartment and in fluid communication with an eccentric bearing of the gerotor pump.