FR2750745A1 - PUMP PROVISION - Google Patents

Abstract

The present invention relates to a pump arrangement. This arrangement consists of an oil tank (1) with filter (27), an electric motor (2) and a positive displacement pump. The objective of the invention is to manufacture a group of this type with few components and at low cost. As a positive displacement pump, an external gear pump (3) has been provided which bears on a through shaft (4) of the electric motor (2) the driving wheel of the gear pump (3). A flange (8) of the electric motor (2) in which a central bearing (6) is supported has play at its outer diameter (8) allowing the bearing (6) to be adjusted on the gear pump (3). Further, the drive wheel (7) supported by a ball drive sits on the drive shaft (4). The oil reservoir (1) is held by a clamp (31) on a bearing surface (30) of the gear pump (3) in order to allow easy disassembly.

Description

PUMP PROVISION

  The present invention relates to a pump arrangement consisting of

  a pump, an electric motor and an oil tank.

  An arrangement of this type is already presented in DE-OS 43 08 452, which consists of a semi-rotary cell pump controlled by an electric motor and mounted on an oil tank. This arrangement is adapted to a small geometric discharge volume having the smallest possible dimensions. The manufacture of such a pump assembly is however

relatively expensive.

  The objective of the invention is therefore to create a pump arrangement which, together with

  a simple assembly, can be manufactured at an advantageous price.

  This objective is achieved by a pump as defined in the preamble and

  characterized in that a shaft driving the electric motor is embodied as a traversing shaft and supports the driving wheel of the gear pump clamped on the electric motor, and that a bearing of the electric motor is

adjustable.

  According to the invention, a gear pump is provided as a pump, the drive wheel being located on a transverse drive shaft of the electric motor flanged to the gear pump. In this assembly, the drive shaft is mounted in the pump housing. So that the bearing of the driving shaft is not statistically indeterminate, we will choose at the output of the electric motor a bearing easy to adjust. The proposed provision allows for a

  inexpensive set particularly suited to the power steering of vehicles

light cules.

  According to a preferred embodiment, a front flange of the electric motor

  cudgel is supported with outside diameter play.

  A bearing may be provided as a free bearing for a shaft with a clearance.

  The driving wheel of the gear pump is preferably maintained on

  the driving shaft by means of a ball drive.

  The oil reservoir is advantageously fixed by a clamp on the

gear pump.

  According to an advantageous embodiment, a pressure channel on the output side of the gear pump is dimensioned large enough to act as a damper and at the same time contributes to the reduction.

  of the entredent on the gears.

  According to a preferred embodiment, a pivot on which the wheel rotates

  conducted is pressure molded into the pump housing.

  The gear pump advantageously has a closure cover.

  passing through the oil tank, as well as an oil filter sandwiched between the

  oil tank and closing lid.

  The casing is preferably a die-cast housing, a bore

  positioning system having been created for the gear pair with amor-

  integrated weaver, made in the form of a pressure channel.

  According to an advantageous embodiment, a sealing pressure field plate and a front plate for adjusting the axial clearance have been provided, the sealing of the pressure field plate being provided with knots for pressing into a bore and sealing

  with closed ends.

  An adjustable flange is preferably used at the output of the electric motor.

  cudgel. Nevertheless, it is also possible to provide a bearing with play in the form of a free bearing of the shaft. It is advantageous from the point of view of the costs of fixing the driving wheel on the driving shaft by means of a ball drive. The oil tank can be easily attached to the pump with a hose clamp. To dampen pressure pulsations, a pressure channel at the output of the gear pump is sized large enough to act as a damper. In addition, by a pressure component in the direction of the supply, the shock absorber contributes to

  reduce the entry of the gears. Moreover, it is advantageous to introduce

  in the casing of the pump a pivot on which is mounted a movable bearing for the driving wheel. Finally, it is advisable to equip the pump with a cover entering the oil tank and serving as a stop for an oil filter. The housing of the gear pump will preferably be a die-cast aluminum housing having the movable bearing of the shaft and the damper in a pot-shaped bored housing, as well as the gear. All the provisions mentioned above contribute to

  create a low-cost, low-noise and good-quality oil supply

for passenger cars.

  The advantages of the invention are explained by means of an exemplary embodiment

  FIG. 1 is a partial longitudinal sectional view through the entire pump arrangement, FIG. 2 is a sectional view through the gear pump, and FIG. from above on a plate of the pressure field of the

  gear pump according to line 111-111 of FIG.

  With reference to FIG. 1, a gear pump 3 is mounted between an oil tank 1 and an electric motor 2. A driving shaft 4 extends from the electric motor 2 into the gear pump 3. The shaft leading to its support in a rear bearing 5 and in a central bearing 6 in the electric motor 2. The latter carries at its front end a drive wheel 7. The central bearing 6 is mounted in a flange 8. According to this figure, the central bearing 6 will be made as a free bearing because the flange 8 is adjustable according to its outer diameter 10. In this way, it is easy to

  correct misalignments. Instead of flange play described above

  above, it is also possible to have a mounting of the central bearing 6 with clearance in the flange 8. The bearing 6 serves essentially as a support for the non-assembled assembly, for example for transport or for testing the electric motor 2 not mounted. The flange 8 further comprises a switch 11 and a wiper blade 12 for current conduction. Behind the bearing 6 is mounted a seal 13 of the shaft. A slide bearing 9 is mounted in a casing 14, preferably a die cast housing, of the gear pump 3. In addition to the driving wheel 7, judiciously fixed by a ball drive 15 on the driving shaft 4, the casing 14 comprises a driven wheel 16. The driven wheel 16 is housed in a

  sliding sleeve 17 being movable on a pivot 18 advantageously molded

  The pair of wheels 7, 16 seals in known manner to its outer diameter in the housing 14 (Figure 2). The gear pump 3 draws the oil through an inlet 20 and delivers it to the entredents along the contour of the housing in a pressure channel 21. The wheels 7, 16 are mounted in a bore 14A in the form of a pot . Of

  even, the pressure channel 21 is disposed in the bore 14A. It is advan-

  tageux to design the pressure channel 21 as a large damper

  which advantageously decreases the pulsation of the refueling flow.

  and the sound emission of the gear pump 3. The discharged oil flows into an outlet 26, and from there to a consumer, for example a power steering. The speed pressure pushes on a

  pressure field plate 22, and this against a front plate 23.

  This force is transmitted by the pair of wheels 7, 16 to a closure cover 25 having an abutment surface, where it is supported. The pressure field supplied is limited by a special sealing 24. The pressure field produced by the pressure channel 21 (damper) determines minimum gaps between the housing 14 and the gears 7, 16. The sealing 24 has nodes 24A which fix the plate of the field

  pressure 22 in a bore 14B. The front ends of the sealing

  cation 24 are closed in the case of profiled sealing for

  obtain the seal inside the bore 14B.

  The oil reservoir 1 receives a filter 27 which is judiciously clamped between the

  oil tank 1 and the closure lid 25.

  The oil tank 1 comprises a closure cap 28 to complete the oil level. Finally, the oil reservoir 1 is fixed by means of a clamping collar 31 on a front face 30 of the gear pump 3. The present invention is not limited to the embodiment described, but

  extends to any obvious variant for a person skilled in the art.

Claims (10)

  1. Pump arrangement consisting of a pump (3), an electric motor   trolley (2) and an oil tank (1), characterized in that: - a gear pump (3) is provided as a pump, - a driving shaft (4) of the electric motor (2) is designed as a shaft traversing and supporting the driving wheel (7) of the gear pump (3) clamped on the electric motor (2), and   a bearing (6) of the electric motor (2) is adjustable.   2. Pump arrangement according to claim 1, characterized in that a front flange (8) of the electric motor (2) is supported with clearance to the diameter outside (10).   3. Pump arrangement according to claim 1, characterized in that   bearing (6) is provided as a free bearing for a shaft with clearance.   4. Pump arrangement according to claims 1, 2 or 3, characterized in that   the driving wheel (7) of the gear pump (3) is held on   The driving shaft (4) by means of a ball drive (15).   5. Pump arrangement according to claims 1, 2 or 3, characterized in that   the oil tank (1) is fixed by a clamp (31) on the pump with gears (3).   6. Pump arrangement according to claims 1, 2 or 3, characterized in that   a pressure channel (21) on the output side of the gear pump (3) is dimensioned large enough to act as a damper and at the same time contributes to the reduction of the impedance on the wheels toothed (7, 16).   Pump arrangement according to claims 1, 2 or 3, characterized in that   a pivot (18), on which the driven wheel (16) rotates, is pressure molded in the pump housing (14).   Pump arrangement according to claims 1, 2 or 3, characterized in that   the gear pump (3) has a closing cover (25) passing through the oil reservoir (1) and an oil filter (27) enclosed therein   between the oil tank (1) and the closure lid (25).   Pump arrangement according to claims 1, 2 or 3, characterized in that   the housing (14) is a die-cast housing, and a positioning bore (14A) has been created for the gear pair (7, 16) with integrated damper in the form of a channel pressure (21).   Pump arrangement according to claims 1, 2 or 3, characterized in that   a pressure field plate (22) with sealing (24) and a   front plate (23) for adjusting the axial clearance have been provided, in that the   (24) of the pressure field plate (22) is provided with   knots (24A) for supporting a bore (14A), and that the   cherification (24) has closed ends.