Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
  • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders

Definitions

• the invention relates to an axial piston pump with a pump housing, a motor-driven shaft, a swash plate rotatably connected to the shaft and a number of pistons which can be moved back and forth by means of the swash plate, as described for example in DE 44 45 522 AI.
• Such axial piston pumps are used, among other things. used in electronic braking systems for motor vehicles, which can be equipped with controlled devices for preventing the locking of individual wheels when braking, for preventing the driven wheels from spinning and other devices for active vehicle stabilization.
• electronic braking systems for motor vehicles which can be equipped with controlled devices for preventing the locking of individual wheels when braking, for preventing the driven wheels from spinning and other devices for active vehicle stabilization.
• the object is therefore to develop an axial piston pump of the type mentioned at the outset in such a way that the disadvantages mentioned can be overcome.
• the flow of power should be better manageable and, on the other hand, the edge position of the channels in the housing should be avoided as far as possible, so that more favorable design options can be created for the external connections.
• the available space for example an electronic braking system, should be used optimally.
• a central bore is provided in the pump housing, through which an extension of the shaft extends, at the end of which the swash plate is arranged outside the pump housing.
• the swash plate is advantageously arranged in a cover, which can be designed as a valve block or electronics box of an electronic braking system.
• the pump pistons are advantageously arranged between the swash plate and the pump drive motor. It is also proposed that the piston by means of Return springs are clamped between the swash plate and the inner end of the holes.
• a shaft bearing is expediently axially supported on the surface of a stepped bore of the pump housing, which is opposite the inner end of the bores.
• the proposal according to the invention has the great advantage that the frictional connection takes place via the extension of the shaft which is subjected to tension and that only the part between the bearing and the inner end of the bores is subjected to pressure in the main direction of force from the housing.
• the frictional connection is closed via the bearing which is subjected to pressure and the pistons and return springs which are also subject to pressure and via the swashplate which is subjected to bending.
• the housing essentially only has to absorb lateral forces, i.e. the components that are not parallel to the axis of the shaft or the bores.
• the required larger space requirement for the bores in the radial direction does not play a major role, because the pump housing for the attachment of the drive motor usually has to be made larger transversely to the shaft axis than is required for accommodating the bores for the pistons.
• the larger space requirement in the radial direction is compensated for by a smaller space requirement of the pump housing in the axial direction, because the channels for the supply and discharge of the fluid are no longer arranged on the edge, but at a medium height of the housing and because only in the central part the bearing height, the piston length and the thickness of the swash plate including the bearing-dependent full height of the pump housing must be realized.
• Figure 1 shows a longitudinal section through the central part of a pump housing (1) for an axial piston pump according to the invention.
• the motor-driven shaft 2 has an extension 9, on the end of which a swash plate 3 with an axial bearing 13 is rotatably attached.
• a bearing 6 is arranged between the shaft 2 and the pump housing 1, via which radial and axial forces can be transmitted from the shaft 2 to the pump housing 1.
• holes 7 for pistons 4 and return springs 5, preferably rounded on the end face, are arranged parallel to the shaft axis, the inner ends 10 of which lie opposite a surface 11 of the stepped bore 12 formed in the housing 1 for the bearing 6.
• the material region of the pump housing 1 lying between the inner ends 10 of the bores 7 and the surface 11 is the only part of the pump housing that has to absorb forces in the main direction of attack parallel to the shaft axis. Adjacent to the inner ends 10 are the bores 7 with channels 14 and 15 formed in the pump housing 1 for the supply and discharge of the Media connected.
• the extension 9 of the shaft 2 is carried out according to the invention through a central bore 8 in the pump housing 1, which is closed by a cover 16 which overlaps the swash plate 3 and which does not have to be part of the pump housing.
• the cover is designed as a valve block and / or electronics box of an electronically controlled braking system.
• the pistons are therefore preferably arranged between the swash plate 3 and the motor (not shown) driving the pump 1.
• a receiving area 17 for the arrangement of the drive motor for the shaft 2 is provided in the pump housing 1.
• the delivery chambers formed between the end face of the pistons 4 and the inner end of the bores 7 are no longer on the edge side in the housing 1, so that for the arrangement of the channels 14, 15 for supplying and removing the delivery medium and their external Connections there are better design options.
• the pump housing 1 can be kept flatter overall, because only the central area must have the full height due to the dimensions of the bearing 6, the return springs 5, the piston 4 and the swash plate 3.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7856093

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (2)

Citations (6)

Family Cites Families (4)

• 1998
  • 1998-01-30 DE DE19803533A patent/DE19803533A1/de not_active Withdrawn
• 1999
  • 1999-01-26 WO PCT/EP1999/000448 patent/WO1999039100A1/de active IP Right Grant
  • 1999-01-26 DE DE59905314T patent/DE59905314D1/de not_active Expired - Lifetime
  • 1999-01-26 JP JP2000529539A patent/JP2002502007A/ja active Pending
  • 1999-01-26 EP EP99903678A patent/EP1049874B1/de not_active Expired - Lifetime

Patent Citations (6)

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