EP1775743B1 - Hydraulischer Druckschalter - Google Patents

Hydraulischer Druckschalter Download PDF

Info

Publication number
EP1775743B1
EP1775743B1 EP20060020064 EP06020064A EP1775743B1 EP 1775743 B1 EP1775743 B1 EP 1775743B1 EP 20060020064 EP20060020064 EP 20060020064 EP 06020064 A EP06020064 A EP 06020064A EP 1775743 B1 EP1775743 B1 EP 1775743B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic pressure
spring plate
pressure switch
actuating piston
switch according
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.)
Not-in-force
Application number
EP20060020064
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1775743A3 (de
EP1775743A2 (de
Inventor
Götz-Dieter MACHAT
Martin Ruppert
Minka Tschekorsky Orloff
Hubert Feser
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.)
Bosch Rexroth AG
Original Assignee
Bosch Rexroth AG
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 Bosch Rexroth AG filed Critical Bosch Rexroth AG
Publication of EP1775743A2 publication Critical patent/EP1775743A2/de
Publication of EP1775743A3 publication Critical patent/EP1775743A3/de
Application granted granted Critical
Publication of EP1775743B1 publication Critical patent/EP1775743B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Definitions

  • the present invention relates to a hydraulic pressure switch for controlling hydraulic systems, with a projecting into a pressure chamber and the pressure prevailing there axially displaceable actuating piston whose opposite end of the pressure chamber is in operative connection with a spring plate, on the other hand acted upon by a compression spring to generate a back pressure is and the operation of an electrical switch is used.
  • the field of application of hydraulic pressure switches extends primarily to hydraulic systems in which a pressure-dependent switching on and off of an electrical circuit is to take place. As a result, for example, a shutdown of a hydraulic system at a dangerous pressure increase is possible. Or a machining process is started as soon as a certain pressure is reached.
  • hydraulic pressure switch of interest are also used as overload protection of hydraulic lifts and the like.
  • Hydraulic pressure switches are available in different versions with regard to the adjusting elements for adjusting the switching pressure.
  • the adjusting element can be designed as a spindle with hexagon socket, with and without protective cap, as spindle with hexagon socket and scale, with and without protective cap, as a rotary knob with scale (also lockable) and the like.
  • the solution according to the invention is applicable to all these variants of hydraulic pressure switches.
  • the pressure switch consists essentially of a housing housing the spindle, in which also a base body is accommodated with a pressure chamber fed by a pressure chamber. In the pressure chamber projects into an actuating piston, the pressure chamber opposite end with a Spring plate is in operative connection. To the other side of the spring plate acts a compression spring to generate the back pressure whose power is adjustable via the spindle. A likewise housed in the housing electrical switch is operated by the spring plate. If the pressure to be monitored by the hydraulic pressure switch is below the set value, the switch is actuated. The pressure to be monitored is applied to the actuating piston via the pressure chamber.
  • the actuating piston thus acts on the continuously adjustable force of the compression spring. By transferring the resulting movement of the spring plate on the switch, this is released as soon as the set pressure is reached. As a result, depending on the circuit structure, an electrical circuit is switched on or off.
  • a design goal of hydraulic pressure switches is to take measures to ensure the lowest possible relative movement of the components with each other. Because a possible low friction interaction of the components with each other leads to a high shift quality.
  • the invention includes the technical teaching that the power flow between the actuating piston and the spring plate extends over a bearing ball arranged therebetween in order to ensure a radial play of the spring plate relative to the radial play-free actuating piston.
  • the advantage of the solution according to the invention lies, in particular, in the fact that the bearing ball arranged at the special point, namely directly on the actuating piston, eliminates the disturbing forces acting on the actuating piston in the radial direction.
  • the actuating piston is easier to move axially in its guide bore and the hysteresis of the hydraulic pressure switch is reduced serious. Because of the lower friction, the life of the pressure switch increases accordingly.
  • the inventively designed hydraulic pressure switch is compared to the prior art easier to maintain, because because of the minimal friction construction decreases the susceptibility to failure.
  • the bearing ball is to be arranged in a coaxial recess on the part of the spring plate, which is partially closed by the corresponding end of the actuating piston so that the bearing ball remains in the mounting position.
  • This measure ensures that the bearing ball having a relatively small diameter is securely held in its position and can also be mounted in a simple manner.
  • the diameter of the bearing ball should preferably be in the range of 2-3 mm, very preferably 2.4-2.6 mm. In these areas, an optimum balance between bearing function and manageability is achieved. Because a bearing ball with the smallest possible diameter compensates for the forces occurring at this point particularly effective. On the other hand, however, a bearing ball with too small a diameter would lead to poor handling, which does not preclude assembly errors. On the other hand, too small a bearing ball would restrict the range of motion of the bearing too much.
  • a further measure improving the invention consists in that the sealing ring used in the main body for guiding the actuating piston is arranged close to the location of the end of the actuating piston which corresponds to the bearing ball.
  • the sealing ring has been arranged as close as possible to the pressure chamber, so that along the guide bore of the actuating piston friction problems due to the metal-metal pairing occurred.
  • the actuating piston can consist of a standardized needle roller.
  • needle rollers are usually used for the production of needle bearings and have a particularly high hardness and surface quality.
  • a ball bearing ball can be used in a similar manner, which is usually part of a ball bearing.
  • the spring plate is guided axially via a shoulder formed in the housing.
  • the heel of the sales hole can form the end stop for the switch.
  • the compression spring should come to rest on the spring plate with at least 1.5 end turns, preferably at both spring ends, which offers the advantage that a position-oriented assembly can be dispensed with.
  • the end stop to the other side can form a union nut, which is screwed onto the base body and is coaxially penetrated by the actuating piston.
  • the union nut can be provided with a spigot, which ensures an additional, but with play leadership of the spring plate.
  • electrical switch is actuated, which may be designed as an electrical button.
  • a hydraulic pressure switch shown here consists essentially of a housing 1 with a hydraulic connection 2 for tapping the pressure in a hydraulic system.
  • an internal electrical switch which is not recognizable here, is actuated, the switching signal of which can be tapped off via external electrical contacts 3.
  • the setting of the switching pressure via an internal spindle, which is accessible here after removing a detachably attached to the housing 1 protective cap 4.
  • the embodiment according to Fig.2 also has a hydraulic connection 2 arranged on a housing 1 and an electrical connection 3.
  • the setting of the switching pressure is here in contrast to the embodiment described above via a rotary knob 5 by means of a scale 6. To avoid an unwanted adjustment of the switching pressure of this hydraulic pressure switch is lockable.
  • FIG. 3 is located in the interior of the housing 1 of a hydraulic pressure switch, a flange-like base body 7.
  • the main body 7 is associated with the outer hydraulic port 2.
  • the pressure medium enters an internal pressure chamber 9.
  • an actuating piston 10 which consists of a standardized needle roller, into and is acted upon axially by the pressure prevailing in the pressure chamber 9 pressure.
  • actuating piston 10 At the opposite end of the actuating piston 10 via a bearing ball 11 with a spring plate 12 in contact.
  • the spring plate 12 is acted upon on the opposite side by a compression spring 13 for generating a defined backpressure.
  • a washer 15 is provided therebetween.
  • the axial position of the spring plate 12 results from the ratio between the force exerted by the compression spring 13 against the force exerted by the actuating piston 10 as a result of the hydraulic pressure force. If the force resulting from the hydraulic pressure is greater, the electrical switch 16 designed here in the manner of a micro-switch triggers, which is fixedly mounted on the housing 1.
  • the spring plate 12 is axially guided over a formed in the housing 1 sales hole 17, the paragraph forms an end stop when triggering the switch 16.
  • the power flow between the actuating piston 10 and the spring plate 12 passes through the bearing ball 11 arranged therebetween.
  • the bearing ball 11 ensures a sufficient radial play of the spring plate 12 relative to the radial play-free, as guided in the main body 7, actuating piston 10.
  • the ball bearing 11 is captive in one accommodated to the spring plate 12 coaxially arranged recess 18 which is closed by the corresponding end of the actuating piston 10 so that the bearing ball 11 remains in this mounting position.
  • the ball bearing 11 has a diameter of 2.5 mm in this embodiment.
  • the recess 18 is formed to accommodate the bearing ball 11 in the spring plate 12 in the manner of a blind hole with a conical bottom portion.
  • a sealing ring 19 inserted in the base body 7 for dynamic sealing of the actuating piston 10 is located close to the location with the bearing ball 11 corresponding end of the actuating piston 10 is arranged.
  • pressure medium can proceed from the pressure chamber 9 into the gap region between the base body 7 and the actuating piston 10 and act here lubricating. Possible pressure peaks are passed through the gap only greatly reduced to the seal, which greatly increases their service life.
  • the main body 7 is provided with a penetrated by the actuating piston 10 union nut 20.
  • the union nut 20 serves as a further end stop for the spring plate 12 and also has a centering lug 21 for additional play-related leadership of the spring plate 12.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
EP20060020064 2005-10-14 2006-09-26 Hydraulischer Druckschalter Not-in-force EP1775743B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510049171 DE102005049171A1 (de) 2005-10-14 2005-10-14 Hydraulischer Druckschalter

Publications (3)

Publication Number Publication Date
EP1775743A2 EP1775743A2 (de) 2007-04-18
EP1775743A3 EP1775743A3 (de) 2008-11-05
EP1775743B1 true EP1775743B1 (de) 2013-04-03

Family

ID=37401181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060020064 Not-in-force EP1775743B1 (de) 2005-10-14 2006-09-26 Hydraulischer Druckschalter

Country Status (3)

Country Link
EP (1) EP1775743B1 (da)
DE (1) DE102005049171A1 (da)
DK (1) DK1775743T3 (da)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8022321B2 (en) 2009-02-10 2011-09-20 Honeywell International Inc. Hydraulic pressure switch with porous disc as snubbing element
US9966211B1 (en) * 2015-05-21 2018-05-08 Hydra-Electric Company Pressure switch system
CN113175560A (zh) * 2021-06-15 2021-07-27 浙江金隆铜业股份有限公司 一种具有前置过滤器的阀体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE876561C (de) * 1951-10-19 1953-05-15 Hermann Kurt Weihe Hydraulisch betaetigter Stopplichtschalter
DE3245937A1 (de) * 1982-12-11 1984-06-14 Hydrostar Dipl.-Ing. Rolf Oehler KG, 5840 Schwerte Hydraulischer druckschalter
JPH0545941Y2 (da) * 1986-09-30 1993-11-30
DE19818838C2 (de) * 1998-04-28 2000-02-17 Bosch Gmbh Robert Druckschalter
DE19818841A1 (de) * 1998-04-28 1999-11-11 Bosch Gmbh Robert Druckschalter

Also Published As

Publication number Publication date
EP1775743A3 (de) 2008-11-05
DK1775743T3 (da) 2013-07-08
EP1775743A2 (de) 2007-04-18
DE102005049171A1 (de) 2007-04-19

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