WO2015144159A1 - Cylindre émetteur pour un système hydraulique - Google Patents

Cylindre émetteur pour un système hydraulique Download PDF

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Publication number
WO2015144159A1
WO2015144159A1 PCT/DE2015/200141 DE2015200141W WO2015144159A1 WO 2015144159 A1 WO2015144159 A1 WO 2015144159A1 DE 2015200141 W DE2015200141 W DE 2015200141W WO 2015144159 A1 WO2015144159 A1 WO 2015144159A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
master cylinder
cylinder
hydraulic
inductive sensor
Prior art date
Application number
PCT/DE2015/200141
Other languages
German (de)
English (en)
Inventor
Richard Dubas
Yannick Christiaens
Original Assignee
Schaeffler Technologies AG & Co. KG
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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to DE112015001418.7T priority Critical patent/DE112015001418A5/de
Publication of WO2015144159A1 publication Critical patent/WO2015144159A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/08—Fluid-actuated clutches with fluid-actuated member not rotating with a clutching member
    • F16D2025/081—Hydraulic devices that initiate movement of pistons in slave cylinders for actuating clutches, i.e. master cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/18—Sensors; Details or arrangements thereof

Definitions

  • the present invention relates to a master cylinder for a hydraulic system, in particular for a hydraulic clutch system or for a hydraulic brake system, which has an improved functionality.
  • master cylinder for a hydraulically actuated clutch or brake of vehicles with a housing arranged in a guide sleeve, which forms a portion of a cylinder in which a connected via a piston rod with a manually operated pedal or with an electromagnetically or hydraulically actuated actuator piston is guided axially displaceable. It may be necessary, for example, for controlling the master cylinder to determine the position of the cylinder in the guide sleeve.
  • a piston may be provided, to which a so-called target is attached, so as to enable an inductive displacement measurement of the master piston.
  • Targets of this type can be space-consuming both axially and radially, which can be disadvantageous even in the case of limited space conditions.
  • the target is a separate component, which extends the assembly time of the master cylinder.
  • a suitable attachment is needed to create the smallest possible gap between the target and the inner wall of the corresponding pressure chamber.
  • squish ribs are provided in the prior art, which are pressed. Overall, this requires more target material than is necessary for a suitable signal strength or signal quality of a path measurement. Even with squish ribs optimal centering of the target is difficult.
  • a master cylinder for a hydraulic system, in particular for a hydraulic engagement system or disengagement system of a clutch, which allows a travel measurement, in particular an inductive travel measurement, in particular with reduced space requirement.
  • the object is achieved by a master cylinder with the
  • the master cylinder according to the invention is particularly suitable for a hydraulic system, in particular for a hydraulic clutch system or for a hydraulic brake system. He has for displaceably guiding a piston to a cylinder in which the piston is displaceably guided, wherein for determining the position of the piston adjacent to the cylinder and outside of the cylinder, an inductive sensor is provided.
  • the master cylinder is characterized in that the piston is at least partially made of a detectable by the inductive sensor material, in particular metal, designed.
  • a prescribed master cylinder allows in particular an inductive displacement measurement or an inductive position determination of the piston in a small footprint.
  • Such a master cylinder has to displaceably guide a piston on a cylinder, which is to serve as a pressure chamber for receiving a fluid to be delivered, the hydraulic fluid.
  • a hydraulic fluid can serve in non-limiting brake fluid.
  • the cylinder may be bounded by a housing or at least partially by a guide sleeve.
  • the housing or the guide sleeve which is also referred to as a bushing, can have or limit the cylinder in its interior, wherein the piston is arranged in the cylinder and guided axially displaceably there.
  • the guide sleeve can in turn be arranged in a housing of the master cylinder or be part of the housing.
  • the cylinder can define the primary pressure chamber of the master cylinder or at least partially limit it.
  • the hydraulic fluid can thus be conveyed from the master cylinder into a hydraulic line connected to the cylinder and from there to a slave cylinder, in order to operate a hydraulic system, in particular a hydraulic clutch system.
  • a piston rod may be movably arranged, which ensures a connection to a pedal device, via which the piston is displaceable in the sleeve and thus the master cylinder is manually operable.
  • operating the master cylinder is not limited to a manual operation described above.
  • an inductive sensor is provided for determining the position or for determining the travel of the piston adjacent to the cylinder and outside the cylinder, for example on the housing, embedded in the housing and / or on the side of the guide sleeve opposite the cylinder.
  • Such an inductive sensor serves in particular as an inductive displacement sensor or as an inductive position sensor.
  • An inductive position determination is particularly advantageous, since this allows a highly accurate and further contactless position determination, which does not adversely affect the actual work of the master cylinder.
  • the sensor is arranged adjacent to the cylinder, which may in particular mean that the sensor is positioned in such a way to the cylinder that a displacement measurement or a position determination of the piston in the cylinder is made possible or that the sensor monitors the cylinder.
  • the inductive sensor can be configured as such, as is well known from the prior art for inductive position sensors or for inductive displacement sensors per se.
  • a sensor may, for example, be based on the principle that the inductance of the coil changes in accordance with the immersion depth of the piston into a coil due to the changing permeability of the material located inside the coil, which is detectable in a manner known to the person skilled in the art.
  • the inductive sensor may have one or a plurality of optionally connected coils which frame the cylinder and whose inductance can be detected by a corresponding means, whereby the position of the piston can be directly deduced.
  • a so-called target is thus to be provided as object to be detected and penetrating into the coil.
  • the piston is at least partially made of a material which can be detected by the inductive sensor, it can be advantageously made possible according to the invention that the target does not need to be applied to the piston or needs to be fixed there, but rather that the target can be formed in a particularly simple manner by the piston itself.
  • This embodiment can provide significant advantages over the solutions known from the prior art.
  • a master cylinder can be created, which is constructed by a component reduction from as few individual parts. In this way costs can be saved and the manufacturing process can be simplified.
  • the production of such a piston may be possible in a particularly cost-effective manner, since the further working step of applying the target, for example comprising screwing or clipping, can be dispensed with. Furthermore, a waiver of such additional process steps allows a saving of additional parts, which can also have a positive effect on the cost. By saving such process steps, the manufacturing process can be significantly simplified.
  • the piston in addition to the saving of the process step of applying the target, the piston can be constructed much simpler, since it can be dispensed with special receptacles for the target on the piston.
  • special structures such as recesses, in which or on which the target can be positioned. Such structures are not necessary in the solution according to the invention.
  • a simple production of the piston can be realized in that the piston is completely formed from the corresponding detectable by the inductive sensor material. While it is not excluded within the scope of the present invention that only a portion of the piston is formed of the corresponding material, complete formation of the piston with respect to a simplified manufacturing process is even more preferred. In this case, complete formation of the piston from such a material does not preclude the integration of further functional components, such as a connector for a piston rod, seals or the like, into the piston after the piston has been manufactured, and such components may differ from one another Material, such as plastic, can be shaped.
  • a solution according to the invention can be realized very space-saving, since no additional space for a target needs to be maintained. Furthermore, the piston can be realized in a desired length and there are no requirements related to the piston length are met by the target.
  • measuring using a master cylinder as described above may be particularly accurate since attachment of a target is often associated with some tolerance in the exact position of the target on the piston as well as the gap between the guide sleeve, for example, and the target. Such tolerances can be reduced according to the invention or even completely avoided, so that measuring tolerances can be particularly small and therefore the measured values obtained can be particularly accurate.
  • a prescribed master cylinder in a particularly simple and cost-effective manner allow improved position determination or displacement measurement of the piston in the guide sleeve.
  • the piston may be at least partially made of aluminum.
  • the piston may be partially or entirely formed of aluminum, as generally described above.
  • aluminum can have the advantage of good measurement behavior using an inductive sensor.
  • aluminum has a very light weight, which makes it possible, especially in mobile applications, not only to form a target but also the piston as a whole made of aluminum.
  • a prescribed master cylinder is also suitable for use in mobile applications provided hydraulic systems, such as hydraulic clutch systems in motor vehicles, without problems.
  • the inductive sensor may be arranged to detect a position or movement of the piston in the primary pressure space.
  • the inductive sensor may be arranged to detect a position or movement of the piston in the primary pressure space.
  • a particularly space-saving enabling an inductive position determination of the piston can be realized, since the piston can be made much shorter compared to an arrangement of the sensor in the secondary pressure chamber.
  • the piston is located substantially at every deflection within the primary pressure chamber, so that at any time a position determination of the piston is possible.
  • the piston can be dynamically sealed.
  • a seal may be provided which is not fixed directly to the piston and moves along the sleeve or a housing part, but rather, for example, a seal attached to the guide sleeve or a housing part may be provided on the piston move along and thus the piston against the sleeve or a housing part, for example, dynamically seal.
  • the piston can thus be particularly easy to produce, since the piston need not be designed for securing a seal, in particular a secondary seal.
  • the piston may have a substantially cylindrical shape at least in the region of the secondary pressure chamber.
  • the inductive sensor may have a PCB coil for generating an electromagnetic field.
  • a PCB coil (PCB: printed circuit board) can be understood in a manner which is generally known to a person skilled in the art, in particular a planar coil which is printed on a dielectric, such as a printed circuit board, for example.
  • the master cylinder or the housing can be formed in one or more parts.
  • the master cylinder of the master cylinder can be arranged in a hydraulic system, such as in particular in a hydraulic clutch system or in a hydraulic brake system.
  • the invention further relates to a hydraulic system, in particular a hydraulic clutch system or a hydraulic brake system, such as for a motor vehicle, wherein the hydraulic system is characterized in that it comprises a master cylinder, which is configured as described in detail above.
  • such a hydraulic system has the advantage that, by using a master cylinder according to the invention, it is particularly simple and cost-effective.
  • ten foie manner can allow improved position determination or displacement measurement of the piston in the cylinder such as in the guide sleeve of the master cylinder and thereby allow, for example, an improved control behavior of the hydraulic system.
  • Fig. 1 is a schematic representation of an embodiment of a master cylinder according to the invention for a hydraulic system.
  • Fig. 1 shows an embodiment of a master cylinder 10, which may be part of a hydraulic system, in particular power transmission system, such as a hydraulic clutch system, or a hydraulic brake system.
  • power transmission system such as a hydraulic clutch system, or a hydraulic brake system.
  • the master cylinder 10 has a housing 12 arranged in a cylinder 14 which can form a primary pressure chamber. In the cylinder 14 while a piston 16 is axially movable or displaceable guided such that the piston 16 is axially displaceable in the cylinder 14 and in the primary pressure chamber.
  • the master cylinder 10 is shown such that the piston 16 is in a release position or rest position and thus is ready to promote by an axial displacement hydraulic fluid to a slave, not shown.
  • a piston rod 18 is provided which may be connected to a manually operable pedal or to an electromagnetically / hydraulically operated actuator and further acts on the piston 16 to move or axially displace it to operate the master cylinder 10.
  • the axial length of the cylinder 14 can be adapted to a travel or stroke of the piston 16.
  • the piston 16 can also by corresponding seals 20, 22 against the
  • the seals 20, 22 in particular such, for example, on the housing 12, arranged, that the piston 16 is dynamically sealed.
  • a further seal is also provided at a free end of the housing 12, which bears against the piston rod 18 under prestress and thus effectively prevents dirt entering the housing 12, for example when the piston 16 is actuated in the primary pressure space.
  • the housing 12 is also connected via a connection 26 with a liquid reservoir not shown in FIG. 1, from which hydraulic fluid can flow without pressure into the cylinder 14 for filling or refilling the hydraulic system at a piston position, as shown in FIG.
  • a liquid reservoir not shown in FIG. 1
  • the hydraulic fluid therein is displaced via a port 28 and passes through a pressure line to a with the master cylinder 10 in Connecting, not shown in Fig. 1 slave cylinder.
  • an inductive sensor 30 is provided adjacent to the cylinder 14 and, for example embedded in the housing 12. It is further provided that the piston 16 at least partially, in particular completely, from a detectable by the inductive sensor 30 material, such as metal, in particular made of aluminum, is configured. Alternatively, the piston 16 itself could also consist of a material which can not be detected by the sensor 30 and a coating may be provided on the piston 16 which is detectable by the sensor 30. In FIG. 1, it is shown that the inductive sensor 30 is arranged to monitor the primary pressure space.
  • the inductive sensor 30 may include a coil 32, such as a PCB coil, for generating an electromagnetic field, the piston 16 being in the inductance. Onsfeld the induction coil 32 is located.
  • the metallic piston 16 moves or displaces axially within the cylinder 14.
  • the sensor 30 can detect the exact position of the piston 16. This information can then be transmitted to a recipient.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

L'invention porte sur un cylindre émetteur pour un système hydraulique, en particulier pour un système d'embrayage hydraulique ou pour un système de freinage hydraulique, et qui présente un cylindre (14) pour le guidage mobile d'un piston (16), dans lequel le piston (16) est monté de façon mobile en translation ; pour la détermination de la position du piston (16) dans une région proche du cylindre (14) et situé en dehors du cylindre, il est prévu un capteur inductif (30). Le piston (16) est au moins partiellement fait d'une matière pouvant être détectée par le capteur inductif. Au total, un cylindre émetteur décrit ci-dessus peut rendre possible d'une façon particulièrement simple et peu coûteuse, une meilleure détermination de la position ou une meilleure mesure de la course du piston dans la douille de guidage.
PCT/DE2015/200141 2014-03-24 2015-03-11 Cylindre émetteur pour un système hydraulique WO2015144159A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112015001418.7T DE112015001418A5 (de) 2014-03-24 2015-03-11 Geberzylinder für ein hydraulisches System

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014205374.9 2014-03-24
DE102014205374 2014-03-24

Publications (1)

Publication Number Publication Date
WO2015144159A1 true WO2015144159A1 (fr) 2015-10-01

Family

ID=52813865

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2015/200141 WO2015144159A1 (fr) 2014-03-24 2015-03-11 Cylindre émetteur pour un système hydraulique

Country Status (2)

Country Link
DE (1) DE112015001418A5 (fr)
WO (1) WO2015144159A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793241A (en) * 1986-11-13 1988-12-27 C K D Kabushiki Kaisha Piston position detector for fluid pressure cylinder
DE10250846A1 (de) * 2002-10-24 2004-05-19 Balluff Gmbh Positionssensoranordnung
WO2014023305A1 (fr) * 2012-08-09 2014-02-13 Schaeffler Technologies AG & Co. KG Dispositif à piston-cylindre, en particulier pour un système d'actionnement d'embrayage dans un véhicule automobile
DE102013217115A1 (de) * 2012-09-19 2014-03-20 Schaeffler Technologies AG & Co. KG Targetvorrichtung für eine induktive Wegmessung eines Geberkolbens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793241A (en) * 1986-11-13 1988-12-27 C K D Kabushiki Kaisha Piston position detector for fluid pressure cylinder
DE10250846A1 (de) * 2002-10-24 2004-05-19 Balluff Gmbh Positionssensoranordnung
WO2014023305A1 (fr) * 2012-08-09 2014-02-13 Schaeffler Technologies AG & Co. KG Dispositif à piston-cylindre, en particulier pour un système d'actionnement d'embrayage dans un véhicule automobile
DE102013217115A1 (de) * 2012-09-19 2014-03-20 Schaeffler Technologies AG & Co. KG Targetvorrichtung für eine induktive Wegmessung eines Geberkolbens

Also Published As

Publication number Publication date
DE112015001418A5 (de) 2016-12-29

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