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US 2017/0292516 A1Published application
Pump unit
AssigneeRobert Bosch GmbH
InventorsEvgenij Skrynski, Marian Kacmar, Martin Kling, Oliver Laforsch, Sando Kunath
Life of this patent
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AssigneeRobert Bosch GmbH
InventorsEvgenij Skrynski, Marian Kacmar, Martin Kling, Oliver Laforsch, Sando Kunath
Estimating the term…
There are already known pump units comprising a drive shaft (2) and a rotatably arranged rotor (3) that is driven by the drive shaft (2), wherein the drive shaft (2) has an inclined sliding surface (4) on an end side, which permits the rotor (3) to move back and forth by its rotor axis (5) about a drive axis (6) of the drive shaft (2), wherein the drive shaft (2) has a first bearing section (18) facing towards the the rotor (3), and a second bearing section (19) facing away from the rotor (3). The first bearing section (18) of the drive shaft (2) is arranged in a first sliding bearing (20), and the second bearing section (19) is arranged in a second sliding bearing (21). The load-bearing capacity of the sliding bearing facing towards the rotor (3) is limited up to a predetermined working pressure in the pump unit. In the pump unit according to the invention, the load-bearing capacity of the sliding bearing (20) facing towards the rotor (3) is increased. According to the invention, the diameter of the first bearing section (18) of the drive shaft (2) and the first sliding bearing (20) is respectively larger than the diameter of the second bearing section (19) and the second sliding bearing (21).
A pump unit having a drive shaft (2) and a rotatably arranged rotor (3) which is driven by the drive shaft (2), the drive shaft (2) having, on an end side, an oblique sliding face (4) which causes the rotor (3) with a rotor axis (5) to tumble during rotation of the drive shaft about a drive axis (6) of the drive shaft (1), the drive shaft (2) having a first bearing section (18) which faces the rotor (3) and a second bearing section (19) which faces away from the rotor (3), the first bearing section (18) of the drive shaft (2) being arranged in a first plain bearing (20), and the second bearing section (19) being arranged in a second plain bearing (21), characterized in that the diameter of the first bearing section (18) of the drive shaft (2) and of the first plain bearing (20) is in each case of greater configuration than the diameter of the second bearing section (19) and of the second plain bearing (21).
The pump unit as claimed in claim, characterized in that the first plain bearing (20) and the second plain bearing (21) are configured on a circumferential wall (29) of a housing (1) of the pump unit.
Dependencies are inferred from the claim text.