Electric motor with attached pump

• US 5,326,235 A
• Filed: 12/07/1992
• Issued: 07/05/1994
• Est. Priority Date: 02/21/1991
• Status: Expired due to Fees

• Current Assignee: SWF Auto-Electric GmbH
• Original Assignee: SWF Auto-Electric GmbH
• Inventors: Bruhn, Rainer
• Primary Examiner(s): Bertsch, Richard A.
• Assistant Examiner(s): KORYTNYK, PETER G
• Application Number:
  US07/937,844
• Time in Patent Office: 575 Days
• Field of Search: 417/410 R, 417/423.1, 417/423.6, 417/423.15, 310/89
• US Class Current: 417/410.1
• CPC Class Codes: B60T 8/4022 Pump units driven by an individual electric motor B60T8/4027 takes precedence
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: H02K 2205/06 Machines characterised by means for keeping the brushes in a retracted position during assembly
• CPC Class Codes: H02K 23/66 Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
• CPC Class Codes: H02K 5/148 Slidably supported brushes
• CPC Class Codes: H02K 5/1672 radially supporting the rotary shaft at both ends of the rotor H02K5/1677 takes precedence
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

In order to connect a pump (1) with an electric motor (2) quickly and form-fittingly, a hollow, tappet-shaped stud (6) is formed onto the pot-shaped motor housing (7), specifically onto the bottom of the pot (10). The stud engages an insertion recess (5) of the pump. A driving eccentric (4) of the driven shaft (3) is connected with the pump during the assembly of the pump. If the inside of the tappet-shaped stud (6) is to receive the first motor bearing, a fit is needed at the inside as well as at the outside of the stud. If the motor housing (7) is made from deep drawn sheet metal, the double fit is only possible, if, when viewed in the circumferential direction, the cross section of the wall of the stud (6) is formed like a wave. This facilitates the use of a plastic cover (18) in connection with the sheet metal housing (7) and the avoidance of a carbon brush support plate. In connection with a further embodiment, the lack of a support plate facilitates an automatic assembly of the motor (2) as well as the combination with plug connections and electronic housings.

Claims

1. An electric motor connected with a pump, whereby the housing of the pump comprises a cylindrical insertion recess for a tappet-shaped stud of the motor housing which engages therein and whereby this stud additionally receives the first bearing, free from play, of the motor armature at the side of the pump and has an aperture for the armature and the motor driven shaft, wherein the housing of the motor is formed as a pot-shaped member deep drawn from a metal blank, the opening of the pot, facing away from the pump of said drawn member, is closed by a cover receiving the second bearing of the motor armature, and wherein, seen in the circumferential direction, the cross section of the wall of the stud, which protrudes from the bottom of the pot axially, is formed wave-like and has longitudinal flutes and which form fittingly engages into the insertion recess of the pump.

2. An electric motor connected with a pump according to claim 1, wherein the stud is round at the outside in a section adjacent to the bottom of the pot.

3. An electric motor connected with a pump according to claim 1, wherein at the bottom of the pot of the housing there is a ring-shaped bead concentrically surrounding the stud and protruding towards the outside, which bead comprises integral fixing eyes arranged approximately diametrically opposite each other, whereby the whole embossed part forms a flat flange surface for the pump housing.

4. An electric motor connected with a pump according to claim 3, wherein from the flange surface axially protrudes a groove of the bottom of the pot, which groove is limited by the ring-shaped bead at the outside and by a stud at the inside, whereby the bottom of the groove is preferably situated in the plane of the outer surface of the bottom of the pot.

5. An electric motor connected with a pump according to claim 4, wherein the inner line of the circumference of the bead corresponds approximately to the outer line of the circumference of the tappet-shaped stud and that both lines of circumference show an approximately constant distance in the plane of the flange surface.

6. An electric motor connected with a pump according to claim 4, wherein the bead with the flange surface is formed in the way of a slitted ring and therefore substantially shows a C-shaped form, whereby the space between the end of the C-legs forms a drain channel and is directed to the lower end, during operation position.

7. An electric motor connected with a pump according to claim 1, wherein the edge of the bottom of the pot is bent towards the outside and forms a support area for the cover.

8. An electric motor connected with a pump according to claim 1 wherein the cover comprises a first recess for the second bearing, which recess is situated at the end turned away from the armature of a pipe-like recess for a shift support ring which is penetrated by the armature shaft, whereby the support ring shows a lateral distance of the second bearing, before the assembly of the cover wherein the support ring retains carbon brushes in the shift home position held on the cover for the electric connection with the commutator of the armature in an assembly position and is shifted by the commutator during the assembly of the cover for releasing the carbon brushes.

9. An electric motor connected with a pump according to claim 8, wherein the support ring forms a support member at the side of the commutator for the second bearing in the shift end position and whereby the support ring is held in the shift end position by a press fit in the second recess of the cover.

10. An electric motor connected with a pump according to claim 1 wherein there is a rail-like stud at the cover, which stud engages in the space between the armature and the wall of the pot, and at which stud a recess or a similar fixing facility for a sensor controlling the motor is situated.

11. An electric motor connected with a pump according to claim 10, wherein the rail-like stud is integrally made from plastic with the cover.

12. An electric motor connected with a pump according to claim 10 wherein the sensor comprises a coil body made from a flat punched out metal sheet, which coil body is provided with two integrally made first connecting tabs for the sensor and with two second connection tabs for connecting with the two coil ends.

13. An electric motor connected with a pump according to claim 12, wherein the second connecting tabs of the coil body for forming fixing hooks are bent twice in opposite directions, whereby the free hook ends are directed towards the outside and to opposite directions.

14. An electric motor connected with a pump according to claim 12, wherein the section of the punched out coil receiving the coil is supplied with a plastic coating which leaves out the first and second connecting tabs.

15. An electric motor connected with a pump according to claim 14, wherein the plastic coating consists of a plastic part, which can be folded and is fitted to the shape of the punched coil body in the section of the coil and which is, if unfolded, substantially flat, and whereby a first longitudinal edge, preferably parallel to the folding axes, carries two locking members which when folded, lock with a second longitudinal edge running parallel to the first longitudinal edge at the opposite end.

16. An electric motor connected with a pump according to claim 15, wherein the plastic coating consists of two substantially identical halves, which are connected by an intermediate web, whereby each connection of the intermediate web with its respective half forms a folding axis and whereby the distance between the two folding axes approximately corresponds to the thickness of the metal-sheet of the coil body.

17. An electric motor connected with a pump according to claim 16, wherein one half of the plastic coating is provided with a spaced edge at least in the section of the winding of the coil, the height of which spaced edge approximately corresponds to the thickness of the metal-sheet of the coil body.

18. An electric motor connected with a pump according to claim 16, wherein each half of the plastic coating is approximately H-shaped, whereby the H-web receives the coil.

19. An electric motor connected with a pump according to claim 14 wherein the punched coil body consists of two pieces, especially different in size, connected with each other by two webs, each of which pieces comprises a first and a second connecting plug.

20. An electric motor connected with a pump according to claim 19, wherein one of the webs between the two pieces of the coil body is removed after fixing the plastic coating on the coil.

21. An electric motor connected with a pump according to claim 20, wherein the coated coil body is surrounded by an insulating coating, leaving out the first connecting tabs.

22. An electric motor connected with a pump according to claim 21, wherein the second web between the two pieces of the coil body is removed after fixing the coating.

23. An electric motor connected with a pump according to claim 22, wherein the first connecting tabs of the coil body are connected with a connecting wire each leading to a plug, and these connecting wires run essentially along the rail-like stud of the cover and wherein the plug is situated at the cover.

24. An electric motor connected with a pump according to claim 22, wherein the first connecting tabs of the coil body directly serve as outer terminals.

25. An electric motor and pump unit comprising:

an electric motor having;

(a) an armature including a first bearing, a second bearing, and a driven shaft,

(b) a housing shaped as a pot with a bottom and a tappet-shaped stud protruding from said bottom, said stud enclosing said first bearing without play and having longitudinal flutes and an aperture receiving said driven shaft, and

(c) a cover closing an opening in said housing and having a first recess adapted to receive said second bearing; and

a pump having a housing including a cylindrical insertion recess located at the side of said pump and adapted to form-fittingly receive said tappet-shaped stud of said motor housing.

26. The electric motor and pump unit as claimed in claim 25 wherein said stud has a cylindrical section formed adjacent said bottom of said pot-shaped housing.

27. The electric motor and pump unit as claimed in claim 25 wherein said bottom of said pot-shaped housing has a ring-shaped bead concentrically surrounding said stud, said bead having a pair of integral fixing eyes disposed approximately diametrically opposite each other and forming a flat flange surface adapted to engage said pump housing.

28. The electric motor and pump unit as claimed in claim 27 wherein said bottom of said pot-shaped housing has a groove limited by said bead at its outside and by said stud at its inside, the bottom of said groove positioned in the plane formed by the outer surface of said bottom of said pot-shaped housing.

29. The electric motor and pump unit as claimed in claim 28 wherein said bead has an inner circumference which is approximately constant in the plane of said flange surface and said stud has an outer circumference which is approximately constant in the plane of said flange surface, said inner circumference of said bead corresponding approximately to said outer circumference of said stud.

30. The electric motor and pump unit as claimed in claim 28 wherein said bead is substantially C-shaped, having a pair of curved legs and a drain channel formed between said legs, said drain channel directed downward toward said groove when said electric motor and pump unit is operational.

31. The electric motor and pump unit as claimed in claim 25 wherein said bottom of said pot-shaped housing has a bent edge supporting said cover.

32. The electric motor and pump unit as claimed in claim 25 wherein said first recess of said cover is formed at the end farthest from said armature of a pipe-like recess in said cover and said armature has carbon brushes and a commutator adapted for electrical connection therebetween, said electric motor and pump unit further comprising a shift support ring positioned in said pipe-like recess and penetrated by said driven shaft, said support ring spaced from said second bearing and retaining said carbon brushes before said cover is assembled and shifted by said commutator during assembly to release said carbon brushes.

33. The electric motor and pump unit as claimed in claim 32 wherein said support ring is press fit in said pipe-like recess of said cover alongside said commutator and supports said armature when said electric motor and pump unit is fully assembled.

34. The electric motor and pump unit as claimed in claim 25 wherein said cover has a rail-like stud positioned between said armature and said housing of said electric motor, said electric motor and pump unit further comprising a sensor controlling said electric motor and carried by said rail-like stud.

35. The electric motor and pump unit as claimed in claim 34 wherein said cover and said rail-like stud are integrally molded from plastic.

36. The electric motor and pump unit as claimed in claim 34 wherein said sensor has (a) a coil including two coil ends and (b) a coil body including two integral first connecting tabs connecting said sensor and two second connecting tabs connecting said coil ends, said coil body punched out of a sheet metal band.

37. The electric motor and pump unit as claimed in claim 36 wherein said second connecting tabs form fixing hooks having free ends directed in opposite directions.

38. The electric motor and pump unit as claimed in claim 36 wherein said coil body has an area around which said coil is wound, said area receiving a plastic coating omitted from said first and second connecting tabs of said coil body.

39. The electric motor and pump unit as claimed in claim 38 wherein said plastic coating is formed as a substantially flat plastic part adapted to be folded along folding axes to fit said area of said coil body around which said coil is wound, said plastic coating having a second longitudinal edge on one end and a first longitudinal edge on its opposite end substantially parallel to said folding axes and to said second longitudinal edge, said first longitudinal edge having a hook-like locking member adapted to grip said second longitudinal edge when said plastic part is folded.

40. The electric motor and pump unit as claimed in claim 39 wherein said plastic coating has two substantially identical halves connected by an intermediate web, said folding axes formed along the connections between each half and said web and the distance between said folding axes corresponding approximately to the thickness of said sheet metal band out of which said coil body is punched.

41. The electric motor and pump unit as claimed in claim 40 wherein one of said plastic coating halves has a spaced edge with a height corresponding approximately to the thickness of said sheet metal band out of which said coil body is punched.

42. The electric motor and pump unit as claimed in claim 40 wherein each of said plastic coating halves is approximately H-shaped and forms a central web adapted to receive said coil.

43. The electric motor and pump unit as claimed in claim 38 wherein said coil body has two differently sized pieces connected by first and second webs, each of said differently sized pieces including one of said two integral first connecting tabs and one of said two second connecting tabs.

44. The electric motor and pump unit as claimed in claim 43 wherein said first web connecting said two differently sized pieces is adapted to be removed after said coil body receives said plastic coating.

45. The electric motor and pump unit as claimed in claim 44 further comprising an insulating coating surrounding said coil body and omitting said first connecting tabs after said coil body receives said plastic coating and said coil.

46. The electric motor and pump unit as claimed in claim 45 wherein said second web connecting said two differently sized pieces is adapted to be removed after said coil body receives said insulating coating.

47. The electric motor and pump unit as claimed in claim 46 wherein said cover has a plug and each of said first connecting tabs has a wire which runs substantially along said rail-like stud of said cover and connects to said plug, whereby said first connecting tabs are electrically attached to said plug.

48. The electric motor and pump unit as claimed in claim 46 wherein said first connecting tabs form outer electrical terminals for said coil body.