Pump aggregate for a hydraulic vehicle braking system
AssigneeRobert Bosch GmbH
InventorsHeinz Siegel, Norbert Alaze, Dieter Merklein, Michael Schlitzkus, Andreas Weh, Alexander Bareiss
Life of this patent
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Abstract
A pump unit for a hydraulic vehicle brake system with traction control has an electric motor driving a radial piston pump. A rotor shaft of the pump unit has a hollow shaft with two standardized, hardened cylindrical pins that are press-fitted into the ends of the hollow shaft. The rotor shaft can be produced simply, economically, and without metal-cutting machining. The hollow shaft has high bending and torsional strength. The rotor shaft has a small diameter at the bearing points, which makes a small bearing diameter and thus a small installation space for the pump unit possible.
Claims18
A pump unit for a hydraulic vehicle brake system, the pump unit comprising
- an electric motor having a cup-shaped motor housing (38) and a perforated disk forming a housing cap (40) inserted into an open end of the cup-shaped housing,
- a pump, which can be driven by the electric motor and is accommodated in a pump housing (52),
- the pump unit having a rotor shaft, which extends from the motor housing through the housing cap and into the pump housing,
- a ball bearing supporting the rotor shaft, the ball bearing having an outer ring, one side of the outer ring being located in the housing cap and the other side of the outer ring being located in a bore (58) in the pump housing and positionally secured in axial directions,
- the housing cap (40) being made from sheet metal and having a bearing seat (44) in the shape of a cylindrical collar for receiving the outer ring (46) of the ball bearing (42);
- the bearing seat (44) surrounding the outer ring (46) of the ball bearing (42) by frictional engagement over only a part of its length;
- a free end of the bearing seat (44) being intended for axial contact with the pump housing (52);
- and
- the free end being clamped against the pump housing (52) indirectly via the housing cap (40) and the motor housing (38).
A pump unit for a hydraulic vehicle brake system, the pump unit comprising
- an electric motor having a cup-shaped motor housing (38) and a perforated disk forming a housing cap (40) inserted into an open end of the cup-shaped housing,
- a pump, which can be driven by the electric motor and is accommodated in a pump housing (52),
- the pump unit having a rotor shaft, which extends from the motor housing through the housing cap and into the pump housing,
- a ball bearing supporting the rotor shaft, the ball bearing having an outer ring, one side of the outer ring being located in the housing cap and the other side of the outer ring being located in a bore (58) in the pump housing and positionally secured in axial directions,
- the housing cap (40) being made from sheet metal and having a bearing seat (44) in the shape of a cylindrical collar for receiving the outer ring (46) of the ball bearing (42);
- the bearing seat (44) surrounding the outer ring (46) of the ball bearing (42) by frictional engagement over only a part of its length;
- a free end of the bearing seat (44) being intended for axial contact with the pump housing (52);
- and
- the free end being clamped against the pump housing (52) indirectly via the housing cap (40) and the motor housing (38) to form a clearance between the housing cap (40) and the pump housing (52).
Dependencies are inferred from the claim text.