Liquid pump with a claw pole stator

• US 6,506,034 B1
• Filed: 03/19/2001
• Issued: 01/14/2003
• Est. Priority Date: 07/22/1999
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Lentz, Gerd, Heier, Christoph, Krauth, Wolfgang, Henschel, Matthias
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): Sayoc, Emmanuel
• Application Number:
  US09/787,573
• Time in Patent Office: 666 Days
• Field of Search: 417/432.7, 417/423.14, 417/370, 417/369, 417/423.8
• US Class Current: 417/423.8
• CPC Class Codes: F04D 13/064 Details of the magnetic circuit
• CPC Class Codes: F04D 29/20 Mounting rotors on shafts
• CPC Class Codes: H02K 5/128 using air-gap sleeves or air-gap discs

Abstract

A fluid pump, in particular for the coolant and heating system of a motor vehicle, has a stator (21) of claw pole construction and a rotor (6), separated from the stator (21) by a pipe (11), which is immersed in the coolant and forms a vane wheel. The rotor (6) is disposed radially inside the stator (21).

Claims

1. A fluid pump for a coolant system or heating system of a motor vehicle, comprising a stator (21) and a rotor (6), separated from the stator (21) by a pipe (11), wherein the rotor (6) is immersed in the coolant and forms a vane wheel, wherein the stator (21) is a claw pole stator, wherein an empty annular chamber (16) separates a permanent magnetic outer cylinder (7) from a bearing shaft (8), wherein the bearing shaft (8) surrounds a drive shaft (9), wherein the outer cylinder (7) on one end is closed by a flange (13), wherein the flange carries a plurality of vanes (14).

2. The fluid pump of claim 1, wherein the rotor (6) is disposed axially inside the stator (21).

3. The fluid pump of claim 1, wherein the rotor (6) is connected at at least two axially spaced-apart sites (8′

, 8″

), to said shaft (9), and that the center of gravity of the rotor (6) is located between the two sites.

4. The fluid pump of claim 1, wherein the outer cylinder (7) and the bearing shaft (8) are connected by radial ribs (17).

5. The fluid pump of claim 1, wherein the annular chamber (16) is open on a side remote from the vanes (14) of the door.

6. The fluid pump of claim 1, wherein the rotor is made in one piece of a plastic-bonded magnetic material.

7. The fluid pump of claim 1, wherein a magnetic field sensor is disposed in a magnetic field of the rotor.

8. the fluid pump of claim 1, wherein claws (25) of the claw pole stator are trapezoidal.

9. The fluid pump of claim 1, wherein the stator winding (21) is embodied as a double-wound winding.