Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
  • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
  • B60T8/4031—Pump units characterised by their construction or mounting
• • 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
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/0404—Details or component parts
  • F04B1/0408—Pistons
• • 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
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/14—Pistons, piston-rods or piston-rod connections

Definitions

• the invention relates to a piston pump for requesting a fluid with an improved piston, which is used in particular in brake systems of vehicles.
• Piston pumps are known from the prior art in different configurations.
• Known piston pumps are used, for example, in braking systems of vehicles, which allow an active pressure build-up in response to predetermined driving situations.
• brake systems are, for example, ABS, ESP or TCS systems.
• the response and pressure build-up of such piston pumps must be very good in order to be able to execute a control intervention in the brake system as quickly as possible.
• pistons are used which realize a supply of the fluid through the piston.
• at least one transverse bore and a long bore must be introduced into the piston.
• the known piston pumps use stepped pistons, for which a very complicated and expensive
• the inventive piston pump for requesting a fluid with the features of claim 1 has the opposite the advantage that it is particularly easy and inexpensive to produce. Furthermore, an improved suction behavior can be achieved due to a reduced flow resistance.
• the first piston part is a cylinder.
• the first piston part can be provided in a particularly simple and cost-effective manner.
• the first piston part can be processed particularly easily on its outer circumference.
• a piston with a piston step can be provided in a simple manner if the second piston part has a different, in particular larger, diameter than the cylindrical first piston part.
• the second piston part is a piston head element with at least one inlet opening and a connection opening to a pressure chamber of the piston pump, in which the fluid to be demanded is sucked.
• the necessary openings are simply introduced into the end faces and peripheral regions of the second piston part.
• the inlet opening in the second piston part is preferably arranged laterally and the connection opening is arranged in the bottom of the piston head part.
• the inlet opening in the axial direction of the piston near the bottom of the second Piston part is provided, an extremely short suction region of the piston pump can be realized, so that a flow resistance during the suction phase of the piston pump can be significantly reduced.
• an efficiency of the pump can be significantly increased.
• an inlet valve seat is preferably additionally formed on the piston bottom element.
• the inlet valve seat for example, by means of ball prongs in the assembly process of
• Piston pump can be produced.
• a ball of an inlet valve defines a valve seat in the second piston part during the assembly process.
• a flange for a seal is integrally formed on the piston head element.
• a step is additionally formed on the piston head element. The flange for a seal and the step can be formed in the axial direction of the piston immediately adjacent to each other.
• first piston part and the second piston part are preferably connected by means of a press fit.
• joining techniques such as welding, brazing, gluing or caulking.
• the piston head element comprises four connecting regions, between each of which a slot-shaped inlet opening is formed.
• the four connection regions are arranged symmetrically about a central axis of the piston, so that an influx of fluid from four different directions between the individual connection areas is possible. It should be noted that also more or less than four inlet openings can be provided.
• the piston head element is preferably produced as a cold-formed part or as a rotary fritting part or as a cast part or as a metal injection part or as a sintered part or as a plastic injection-molded part.
• the present invention relates to a brake system for vehicles with a piston pump according to the invention.
• the brake system is preferably designed as a brake system with active pressure build-up.
• Figure 1 is a schematic sectional view of a
• Figure 2 is a perspective view of the piston shown in Figure 1, wherein the two piston parts are shown in the unassembled state.
• the piston pump 2 comprises a piston 2 and a cylinder 8.
• the piston 2 is drivable in a known manner by means of an eccentric and sucks fluid from the direction of the arrow S radially through a filter 9 at.
• the fluid is then fed in the axial direction XX of the piston into a pressure chamber 7.
• a return spring 14 is also arranged for the piston.
• the inlet valve 5 is designed as a non-return valve and comprises a cage 15, in which a spring 16 and a ball 17 is arranged.
• the outlet valve 6 is also designed as a spring-loaded check valve and opens as soon as a pressure in the pressure chamber 7 is greater than a force acting on the ball of the exhaust valve 6 spring force.
• the piston 2 is formed in two parts from a first piston part 3 and a second piston part 4.
• the first piston part 3 is a
• the first piston part 3 has no bore o.A. on.
• the second piston part 4 is a piston bottom element, in which four radial inlet openings 10 and an axial connection opening 11 for a connection to the pressure chamber 7 are arranged.
• a flange 12 for arranging a seal 19 is arranged on the outer circumference of the piston head element.
• the flange 12 is disposed at a step 13 adjacent to the bottom of the second piston part 4. Further seals 20, 21 are arranged in a known manner on the first piston part 3.
• the four inlet openings 10 are symmetrical along the circumference of the piston crown part arranged. Between each inlet opening 10 in each case a connecting region 18 is arranged, via which a connection between the first piston part 3 and the second piston part 4 is produced. The connection between the two piston parts 3, 4 takes place by means of a press fit.
• the circumferential length of an inlet opening 10 corresponds to a circumferential length of a connecting region 18.
• the function of the piston pump 1 is as follows: During the suction stroke of the piston 2, fluid is introduced through the filter 9 in the direction of the arrow S radially through the inlet openings 10 and the connection opening 11 into the pressure chamber 7. After reaching the top dead center, the direction of movement of the piston 2 is reversed so that the inlet valve 5 closes the connection opening 11 on the second piston part 4. Now, a pressure build-up in the pressure chamber 7 takes place until the pressure in the pressure chamber 7 is greater than a spring force of the outlet valve 6. If this is the case, opens the outlet valve 6, so that the pressurized fluid from the pressure chamber 7 in a
• Outlet line (not shown) can be supplied. After reaching the bottom dead center, the direction of movement of the piston 2 is reversed again, so that the exhaust valve 6 closes again and the intake stroke starts again. In this case, a restoring force of the return spring 14 is pressed against the cage 15 of the inlet valve 5, which is supported on the step 13 in order to reset the piston 2 again.
• the inventive piston pump 1 can be fed faster and achieves a significantly improved pressure build-up dynamics.
• the inventive piston can be easily assembled and also easily mounted in the piston pump 1.
• the first piston part 3 is very cost-effective, for example, by cutting off a rod material produced.
• the piston pump according to the invention is particularly preferred in connection with brake systems of vehicles, in particular with active pressure build-up, such as e.g. ABS, ESP, TCS, and / or EHB systems.
• active pressure build-up such as e.g. ABS, ESP, TCS, and / or EHB systems.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Transportation (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=37309536

Family Applications (1)

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Family Cites Families (10)

• 2005
  • 2005-09-06 DE DE102005042197A patent/DE102005042197A1/de active Pending
• 2006
  • 2006-08-25 CN CN2006800324678A patent/CN101258325B/zh active Active
  • 2006-08-25 WO PCT/EP2006/065686 patent/WO2007028728A1/de active Application Filing
  • 2006-08-25 EP EP06793017A patent/EP1926910A1/de not_active Withdrawn
  • 2006-08-25 US US12/065,951 patent/US8382459B2/en active Active

Non-Patent Citations (2)

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