EP3121445A1 - Presse hydraulique - Google Patents

Presse hydraulique Download PDF

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Publication number
EP3121445A1
EP3121445A1 EP16180587.4A EP16180587A EP3121445A1 EP 3121445 A1 EP3121445 A1 EP 3121445A1 EP 16180587 A EP16180587 A EP 16180587A EP 3121445 A1 EP3121445 A1 EP 3121445A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
hydraulic
pump housing
hydraulic pump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16180587.4A
Other languages
German (de)
English (en)
Inventor
Sascha Toberer
Thomas Tack
Roman Weidemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weber Hydraulik GmbH Germany
Original Assignee
Weber Hydraulik GmbH Germany
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weber Hydraulik GmbH Germany filed Critical Weber Hydraulik GmbH Germany
Publication of EP3121445A1 publication Critical patent/EP3121445A1/fr
Withdrawn legal-status Critical Current

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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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/14—Pumps characterised by muscle-power operation
    • 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
    • F04B53/143—Sealing provided on the piston
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the present invention relates to a hydraulic pump, in particular a plunger pump, having a pump housing, which has a working space communicating with an inlet valve and an outlet valve, and with a plunger which dips into the working space and is sealed with respect thereto, displacing hydraulic fluid from the working space when it is immersed and ejects via the exhaust valve and sucks hydraulic fluid through the intake valve in an outward movement.
  • a pivoting movement driven hydraulic hand pumps are universally applicable and are used, for example, for operating cab tilt cylinders, but also for manual control functions on agricultural machinery application.
  • a relatively high pressure level of about 200 to 350 bar (20 to 35 MPa) with a comparatively low volume flow requirement of less than about 1 l / min.
  • An object of the present invention is to provide a simple, robust and reliable hydraulic pump.
  • the object is achieved in that the piston is mounted in or on the pump housing via a thread or an inclined plane, so that a rotational movement of the piston is converted into a relative to the pump housing translational immersion movement.
  • a hydraulic hand pump in particular plunger pump, the pump piston and the drive kinematics, whereby the complexity of the drive kinematics is significantly reduced.
  • the functions of the pump piston and the drive shaft are met with only one component.
  • the hydraulic pump piston and pump housing are coupled together via a screw.
  • the piston serves as a pump shaft and on the piston, an external thread is formed, which engages in an arranged in or on the pump housing internal thread, such as a threaded bush. Since in a screw drive the large forces occurring due to the high pressure over the entire length of the threads distribute, such a construction is particularly robust and durable.
  • screw drives or internal threads are arranged within the working space filled with hydraulic fluid.
  • the screw drive is automatically lubricated by the hydraulic fluid, which reduces friction and wear at the bearing points.
  • the displaced by the piston plunging into the working space hydraulic fluid can flow, for example via the threads from / in a space located behind the piston dead space or it can be introduced into the thread an axially extending groove as a flow path. Also possible would be a connecting hole that connects the dead space with the front of the working space.
  • the internal thread of plastic, the piston preferably made of steel or stainless steel and the pump housing are further preferably made of aluminum.
  • the piston carries at its end immersed in the working space the external thread and this engages in a disposed within or at the end remote from the piston of the working space threaded bushing.
  • Said threaded bushing can preferably be designed as a plastic injection-molded part.
  • a metallic outer sleeve can be provided, into which the internal thread is injection-molded.
  • a hydraulic pump of the type described above can be designed in particular as a hand pump, in which the protruding from the pump housing end of the piston serves as a pump shaft, on which a pivotable pump lever is arranged or can be arranged.
  • a pump shaft on which a pivotable pump lever is arranged or can be arranged.
  • an external hexagon is mounted, on the if necessary, a removable pump lever is plugged. This leads to a particularly compact design of the pump.
  • a hydraulic fluid tank is arranged and connected to the pump housing.
  • the pump and hydraulic fluid tank can be designed as a compact unit, for example for use in a cab tilting system of a truck.
  • a directional control valve which serves for switching between two pressure-side connections.
  • a directional control valve for example, a setting direction of a connected tilting device can be switched over.
  • a preferably adjustable pressure relief valve can be arranged beyond which opens at an overpressure behind the outlet valve.
  • the pressure relief valve may preferably communicate with the aforementioned directional control valve.
  • the pressure relief valve protects the connected lines and hydraulic components from damage in the event of overpressure, for example due to malfunction or blocking of a connected tilting device.
  • the thread of a hydraulic pump of the aforementioned type in order to produce a correspondingly large stroke at small angles of rotation, preferably be designed as a coarse thread and, for example, have a pitch between 30 mm and 80 mm, preferably between 50 mm and 60 mm. It is sufficient if the piston performs an axial movement of 5 mm to 20 mm, preferably 8 mm to 15 mm and the piston performs an angular rotation by an angle of rotation of 30 ° to 120 °, preferably 45 ° - 90 °.
  • a hydraulic tilting device in particular cab tilting device, with a hydraulic tilting cylinder, in particular cab tilting cylinder, and a connected thereto hydraulic pump of the aforementioned type is also specified.
  • hydraulic hand pumps for various fields of application
  • hydraulic plunger pumps with direct drive of the pump piston by means of a pivoting movement
  • the pump according to the invention can be used, for example, as a tilting device in the case of a tipper trailer, for hydraulic supports or for jacks.
  • FIG. 1 schematically illustrated hydraulic hand pump has a cylindrical pump housing 1 with an inner working space 2, in which on the in FIG. 1 upper side of the pump housing 1, an inlet valve 3 and on the lower side of an outlet valve 4 opens.
  • a piston 5 which is referred to as a so-called plunger, also called plunger piston is formed.
  • the piston 5 is hydraulically sealed by means of a radial seal 11 inserted into a groove and a scraper ring 12.
  • a so-called stuffing box seal can be provided.
  • the intake and exhaust valves 3, 4 are conventional, for example ball-sealed check valves.
  • Hydraulic fluid is preferably mineral oil-based hydraulic oil.
  • the arrows A indicate the direction of oil flow through the pump: If the plunger 5 is inserted deeper into the pump housing 1, it displaces when dipping hydraulic fluid from the dead space 9, which via the working chamber 2 and the exhaust valve 4 in a connected hydraulic line (not shown) is pumped. Conversely, in an outward movement of the plunger 5 hydraulic fluid via the inlet valve 3 and a connected intake pipe (not shown) sucked from a hydraulic fluid tank.
  • a threaded bushing 6 is arranged on the pump housing and fluid-tightly connected to the pump housing.
  • the protruding from the pump housing 1 end of the plunger 5 also serves as a pump shaft 10 to which a pump lever can be attached.
  • the pump shaft is rotated in the actuating direction, wherein the rotational movement of the pump shaft via the screw 7, 8 is converted directly into a linear movement of the plunger 5.
  • hydraulic fluid is displaced from the working space 2 of the pump housing 1 and ejected via the outlet valve 4 in a linear movement in the immersion direction. Hydraulic fluid from the dead space 9 at the end of the threaded bushing 6 can either flow back into the working space 2 of the pump housing 1 via the threads or an axial groove or bore introduced into the thread for this purpose.
  • FIGS. 2 to 4 a second embodiment of a hydraulic hand pump is shown.
  • the pump is used to manually operate a cab tilting system with a double-action cab tilt cylinder installed in the tilting mechanism of the cab of a truck.
  • the hand pump comprises a pump housing 1, from which a pump shaft 10 protrudes.
  • the pump shaft 10 has an external hexagon end, on the for the purpose of actuation of the pump, a pump lever (not shown) can be placed.
  • a pump lever (not shown) can be placed in FIG. 3 below the pump shaft 10 left and right two side ports 13, 14 are connected to the pressure lines.
  • a hydraulic line is connected, which leads to the connection piece on the piston side of a cab tilt cylinder.
  • a hydraulic line is connected, which leads to the connection piece on the rod side of the driver's cab.
  • the reference numeral 15 designates a manually operated 4/2-way valve as a changeover valve for switching the hydraulic lines connected to the terminals 13 and 14 for the purpose of tilting up or tipping the driver's cab.
  • connection 16 which corresponds via a bore 2 'in the pump housing with the suction side of the pump.
  • the connection 16 is either sealed pressure-tight or it serves as a connecting piece for an electric auxiliary pump (not shown).
  • the pump is also connected to a hydraulic fluid tank 17, in the embodiment by means of a mounting clamp.
  • a filler neck 18 At the top of the hydraulic fluid tank 17 is a filler neck 18, which is closed with a closure lid 18 '.
  • This may be provided with a vent or an overpressure and / or vacuum valve, so that in case of temperature-induced pressure fluctuations or due to hydraulic fluid loss resulting underpressure or overpressure in the tank 17 can be reduced.
  • the sectional drawing shows the function of the pump, which is basically the in FIG. 1 equivalent.
  • the pump housing 1 has a working space 2 in the form of a cylindrical longitudinal bore.
  • the pump shaft 10 extends into the working space 2 and forms there the plunger 5. This carries at its inner end an external thread 7, which engages in an internal thread 8 attached to the pump housing 1 and projecting from this into the tank 17 threaded bushing 6.
  • the plunger 5 and the pump shaft 10 via means of the inner radial seal 11 (also referred to as radial shaft seal) and the outer scraper ring 12, which are inserted into corresponding grooves in the pump housing, sealed.
  • the threaded bushing 6 has in the exemplary embodiment, without the invention being limited thereto, a metallic outer sleeve, in which an internal thread 8 is formed in the injection molding process.
  • the molded internal thread 8 is made of a high-strength plastic with self-lubricating properties.
  • a plastic based on PPS polyphenylene sulfide
  • PTFE polytetrafluoroethylene
  • the metallic outer sleeve gives the threaded bushing the necessary stability and thus enables cost-effective production of the thread by injection molding.
  • the threaded bushing 6 can be provided at the connection point to the housing 1 with an external thread, so that the threaded bushing can be screwed into the housing 1.
  • the pump shaft 10 is rotated clockwise via a pump lever, then the external thread 7 continues to rotate into the threaded bushing 6, so that the plunger 5 is pressed further into the working chamber 2 of the pump. He displaces hydraulic oil from the dead space 9, which is pumped via the working space 2 and an exhaust valve 4 in the hydraulic line connected thereto and on to the piston side of the cab tilt cylinder.
  • the pump On the suction side, the pump is connected to an intake hose 19 arranged inside the tank 17. At the end of the suction hose 19, a screen and suction head is arranged, which ensures a position-independent function of the pump.
  • an inlet valve 3 which is designed as a spring-loaded ball check valve. Via a longitudinal bore 20, the inlet valve 3 with the connection to the 16th leading radial bore 2 'and connected via this with the working space 2.
  • An inserted into the radial bore 2 'hollow pin 2a serves as a stop or limiter for the rotation angle of the pump shaft 10th
  • the 4/2-way valve 15 for switching between the terminals 13, 14.
  • the 4/2-way valve 15 performs a longitudinal bore 15 'to a spring-loaded pressure relief valve 21. Die Preload the valve spring and thus the pressure at which the valve 21 opens, can be adjusted via a set screw 21 '.
  • the typical operating pressure of the pump is about 200 to 350 bar.
  • An inserted from below into a corresponding radial bore bolt 15a serves as an end stop for the actuator of the 4/2-way valve 15 and limits the angle of rotation by which the operating lever of the 4/2-way valve 15 can be adjusted.
  • the bolt 15a fixes the actuator in the housing against falling out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
EP16180587.4A 2015-07-22 2016-07-21 Presse hydraulique Withdrawn EP3121445A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015111961 2015-07-22
DE102015117301 2015-10-09

Publications (1)

Publication Number Publication Date
EP3121445A1 true EP3121445A1 (fr) 2017-01-25

Family

ID=56507474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16180587.4A Withdrawn EP3121445A1 (fr) 2015-07-22 2016-07-21 Presse hydraulique

Country Status (2)

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EP (1) EP3121445A1 (fr)
CN (1) CN106368923A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111022468A (zh) * 2019-11-22 2020-04-17 陕西北方动力有限责任公司 一种柴油机用新型螺纹衬套及其安装方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007628B (de) * 1955-01-07 1957-05-02 Henricus Franciscus Josef Bern Plungerpumpe, insbesondere zum Antrieb eines hydraulischen Verstellmechanismus
DE1850291U (de) 1962-02-17 1962-04-19 Krantz H Fa Plungerpumpe, insbesondere fuer handbetrieb, mit stufenkolben.
DE19730499A1 (de) * 1997-07-16 1999-01-28 Weber Hydraulik Gmbh Hydraulische Kippvorrichtung
EP0953763A2 (fr) 1998-04-28 1999-11-03 Weber-Hydraulik GmbH Pompe manuelle
DE102004062696A1 (de) * 2004-12-21 2006-06-29 Karl-Heinz Jung Hydraulikpumpe
DE102012222575A1 (de) * 2012-12-07 2014-06-12 Robert Bosch Gmbh Hydropumpenaggregat für eine hydraulische Fahrzeugbremsanlage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007628B (de) * 1955-01-07 1957-05-02 Henricus Franciscus Josef Bern Plungerpumpe, insbesondere zum Antrieb eines hydraulischen Verstellmechanismus
DE1850291U (de) 1962-02-17 1962-04-19 Krantz H Fa Plungerpumpe, insbesondere fuer handbetrieb, mit stufenkolben.
DE19730499A1 (de) * 1997-07-16 1999-01-28 Weber Hydraulik Gmbh Hydraulische Kippvorrichtung
EP0953763A2 (fr) 1998-04-28 1999-11-03 Weber-Hydraulik GmbH Pompe manuelle
DE102004062696A1 (de) * 2004-12-21 2006-06-29 Karl-Heinz Jung Hydraulikpumpe
DE102012222575A1 (de) * 2012-12-07 2014-06-12 Robert Bosch Gmbh Hydropumpenaggregat für eine hydraulische Fahrzeugbremsanlage

Also Published As

Publication number Publication date
CN106368923A (zh) 2017-02-01

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