EP0463349B1 - Power cylinder - Google Patents

Power cylinder Download PDF

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Publication number
EP0463349B1
EP0463349B1 EP91107995A EP91107995A EP0463349B1 EP 0463349 B1 EP0463349 B1 EP 0463349B1 EP 91107995 A EP91107995 A EP 91107995A EP 91107995 A EP91107995 A EP 91107995A EP 0463349 B1 EP0463349 B1 EP 0463349B1
Authority
EP
European Patent Office
Prior art keywords
working
chamber
sensor
cylinder according
working cylinder
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.)
Expired - Lifetime
Application number
EP91107995A
Other languages
German (de)
French (fr)
Other versions
EP0463349A1 (en
Inventor
Manfred Siebold
Norbert Dipl.-Ing. Schneider (Fh)
Friedbert Roether
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0463349A1 publication Critical patent/EP0463349A1/en
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Publication of EP0463349B1 publication Critical patent/EP0463349B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Description

Stand der TechnikState of the art

Die Erfindung bezieht sich auf einen Arbeitszylinder nach der Gattung des Hauptanspruchs.The invention relates to a cylinder according to the preamble of the main claim.

Ein derartiger Arbeitszylinder ist bekannt (US-A-4727 791). Dieser Arbeitszylinder hat den Vorteil, daß die Stellung des im Arbeitszylinder beweglichen Arbeitskolbens jederzeit erfaßbar ist. Es gibt auch schon entsprechende elektrische Erkennungsmittel, wie Endschalter oder dgl.Such a working cylinder is known (US-A-4727 791). This working cylinder has the advantage that the position of the working piston movable in the working cylinder can be detected at any time. There are also corresponding electrical detection means, such as limit switches or the like.

Arbeitszylinder dieser Art werden in jüngster Zeit auch im Zusammenhang mit elektronischen Schalteinrichtungen verwendet, und sie werden auf Fahrzeugen vorgesehen, bei denen sie beispielsweise die Aufgabe von Stellgliedern von elektrisch gesteuerten Kupplungen von Fahrzeug-Motoren übernehmen. Auf Fahrzeugen besteht aber immer das Problem, daß eine auf der Rückseite des Arbeitskolbens liegende Atmungskammer bei ihrer durch die Kolbenbewegung bewirkten Ausdehnung keinen Schmutz oder - im Winter - Salznebel ansaugen darf. Solche Fremdstoffe könnten dort nämlich zur Korrosion führen, wodurch der Arbeitszylinder blockiert.Working cylinders of this type have recently also been used in connection with electronic switching devices, and they are provided on vehicles in which, for example, they act as actuators for electrically controlled clutches of vehicle engines. On vehicles, however, there is always the problem that a breathing chamber lying on the back of the working piston must not suck in dirt or - in winter - salt mist during its expansion caused by the piston movement. Such foreign substances could cause corrosion there, which blocks the working cylinder.

Es ist deshalb auch bereits vorgeschlagen worden, die Atmungskammer über einen Schnorchel mit Filter mit der Außenluft zu verbinden (DE-A-2430 394).It has therefore already been proposed to connect the breathing chamber to the outside air via a snorkel with a filter (DE-A-2430 394).

Ein derart augerüsteter Arbeitszylinder ist dann auch "watfähig", weil der Zugang zur Öffnung des Schnorchels so hochgelegt werden kann, daß beim Durchqueren von Wasserläufen kein Wasser in die Atmungskammer eingesaugt wird.A working cylinder equipped in this way is then also "capable of wading" because the access to the opening of the snorkel can be raised so that no water is sucked into the breathing chamber when crossing water courses.

Nachteilig dabei ist, daß stets besondere Mittel vorgesehen werden müssen, um ein schmutzfreies Atmen der Atmungskammer zu gewährleisten. Bei dem zuerst genannten Arbeitszylinder ist es außerdem nachteilig, daß der Sensoreinbau Platz verbraucht.The disadvantage here is that special means must always be provided in order to ensure that the breathing chamber breathes without dirt. In the case of the first-mentioned working cylinder, it is also disadvantageous that the sensor installation takes up space.

Vorteile der ErfindungAdvantages of the invention

Der eingangs genannte Arbeitszylinder mit den kennzeichnenden Merkmalen des Hauptanspruchs hat demgegenüber den Vorteil, daß zur Führung der Atemluft keine besonderen Mittel notwendig sind.The working cylinder mentioned at the outset, with the characterizing features of the main claim, has the advantage that no special means are required to guide the breathing air.

Außerdem ist es von Vorteil, daß zum Einbau des Sensors kein besonderer Platz vorgesehen sein muß.It is also advantageous that no special space has to be provided for installing the sensor.

Weitere vorteilhafte Merkmale der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous features of the invention emerge from the subclaims.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen: Figur 1 einen Arbeitszylinder im Schnitt mit einem Sensor und Figur 2 den Sensor in vergrößertem Maßstab, ebenfalls im Schnitt.An embodiment of the invention is shown in the drawing and explained in more detail in the following description. FIG. 1 shows a working cylinder in section with a sensor and FIG. 2 shows the sensor on an enlarged scale, also in section.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Ein Arbeitszylinder 1 hat ein Gehäuse 2, das aus einem weitgehend glattwandigen Zylinderstück 3 und einem Anschlußstück 4 sowie je einem Deckel 5 und 6 für Zylinderstück und Anschlußstück besteht. Der für das Zylinderstück 3 bestimmte Deckel 5 hat ein zentrisches Loch, durch das ein Ende einer Kolbenstange 7 abgedichtet nach außen ragt.A working cylinder 1 has a housing 2, which consists of a largely smooth-walled cylinder piece 3 and a connector 4 and a cover 5 and 6 each for the cylinder piece and connector. The cover 5 intended for the cylinder piece 3 has a central hole through which one end of a piston rod 7 projects in a sealed manner to the outside.

Die Kolbenstange 7 hat eine Ausnehmung 8 zur Aufnahme einer Druckstange 9, mit der eine nicht dargestellte Kupplung zu betätigen, d.h. ein- und auszurücken ist.The piston rod 7 has a recess 8 for receiving a push rod 9 with which to actuate a clutch, not shown, i.e. is to move in and out.

Die Kolbenstange 7 trägt auf ihrer anderen Seite einen Arbeitskolben 10, der in dem Arbeitszylinder 1 eine Arbeitskammer 11 von einer dem Deckel 5 zugekehrten Atmungskammer 12 trennt. Durch einen hohlzylindrischen, mit einem Axialkanal 13' versehenen Tauchkörper 13, der mittels Sprengring 14 und Dichtring 15 in der Kolbenstange 7 befestigt ist, ist die Kolbenstange 7 durch die Arbeitskammer 11 hindurch verlängert. An seinem einem Ende endet der Tauchkörper 13 an einem Radialkanal 30 der Kolbenstange 7, der in die Atmungskammer 12 mündet. An dem anderen Ende des Tauchkörpers 13 ist ein Axialdurchgang 31 zu einer Außenluftstelle 29 vorgesehen (vgl. Figur 2).The piston rod 7 carries on its other side a working piston 10, which separates a working chamber 11 from a breathing chamber 12 facing the cover 5 in the working cylinder 1. The piston rod 7 is extended through the working chamber 11 by means of a hollow cylindrical immersion body 13 which is provided with an axial channel 13 'and is fastened in the piston rod 7 by means of a snap ring 14 and a sealing ring 15. At one end, the immersion body 13 ends at a radial channel 30 of the piston rod 7, which opens into the breathing chamber 12. At the other end of the immersion body 13, an axial passage 31 to an outside air point 29 is provided (see FIG. 2).

Der Tauchkörper 13 besteht aus Alu-Material und wird - wie am besten in der Figur 2 zu erkennen ist - von einem hohlzylindrischen Kunststoff-Spulenkörper 16 übergriffen, der die Wicklungen einer Spule 17 trägt, die von einer Abschirmhülse 18 aus ferritischem Material umgeben ist. Spulenkörper 16 mit Spule 17 und Abschirmhülse 18 bilden einen hohlzylindrischen Sensor 16, 17, 18, der mit dem Tauchkörper 13 zusammenwirkt. Die Abschirmhülse 18 ist in einer Trennwand 19 gelagert und trägt auf ihrer dem Arbeitskolben 10 zugekehrten Seite eine mittels Sprengring 20 fixierte Manschettendichtung 21, die auf der Mantelfläche des Tauchkörpers 13 gleiten kann.The immersion body 13 is made of aluminum material and - as can best be seen in FIG. 2 - is overlapped by a hollow cylindrical plastic bobbin 16 which carries the windings of a coil 17 which is surrounded by a shielding sleeve 18 made of ferritic material. Coil body 16 with coil 17 and shielding sleeve 18 form a hollow cylindrical sensor 16, 17, 18 which interacts with the immersion body 13. The shielding sleeve 18 is in one Partition 19 mounted and carries on its side facing the working piston 10 a sleeve seal 21 fixed by means of a snap ring 20, which can slide on the outer surface of the immersion body 13.

Der Spulenkörper 16 samt Abschirmhülse 18 ragt mit seinem dem Arbeitskolben 10 abgekehrten Ende in eine Steuergeräte-Kammer 22. Er ist dort mit einem Kopf 23 versehen, durch den zwei Spulenanschlüsse 24 und 25 hindurchgeführt sind. Die Anschlüsse 24 und 25 sind an eine Elektronik 32 angeschlossen, die wiederum mit einem Zentralstecker 26 elektrisch leitend verbunden ist, der am Deckel 6 befestigt ist.The coil body 16 together with the shielding sleeve 18 projects with its end facing away from the working piston 10 into a control unit chamber 22. It is provided there with a head 23 through which two coil connections 24 and 25 are passed. The connections 24 and 25 are connected to electronics 32, which in turn are connected in an electrically conductive manner to a central plug 26 which is fastened to the cover 6.

Die Trennwand 19 nimmt in achsparalleler Anordnung zwei Magnetventile, ein Belüftungs-Magnetventil 27 und ein Entlüftungs-Magnetventil 28 auf, die in die Steuergeräte-Kammer 22 hineinragen. Das Belüftungs-Magnetventil 27 ist an eine Druckluftquelle 33 und das Entlüftungs-Magnetventil 28 und die Steuergeräte-Kammer 22 sind ebenso wie der Axialkanal 13' des Tauchkörpers 13 an eine Außenluftstelle 29 angeschlossen.The partition 19 accommodates two solenoid valves in an axially parallel arrangement, a ventilation solenoid valve 27 and a ventilation solenoid valve 28 which protrude into the control unit chamber 22. The ventilation solenoid valve 27 is connected to a compressed air source 33 and the ventilation solenoid valve 28 and the control device chamber 22 are connected to an outside air point 29, as is the axial channel 13 ′ of the immersion body 13.

WirkungsweiseMode of action

Der Arbeitszylinder 1 ist zur Betätigung einer Kupplung bestimmt, die in der gezeichneten Stellung des Arbeitskolbens 10 voll eingerückt ist. Zum Lösen der Kupplung wird das Belüftungs-Magnetventil 27 umgeschaltet. Druckluft strömt in die Arbeitskammer 11 und der Arbeitskolben 10 bewegt sich nach links. Dabei verkleinert die Atmungskammer 12 ihr Volumen, und die Atemluft strömt durch den Radialkanal 30 der Kolbenstange 7 und den Axialkanal 13' des Tauchkörpers 13 über die Außenluftstelle 29 und den Deckel 6 zur Außenluft.The working cylinder 1 is intended for actuating a clutch, which is fully engaged in the drawn position of the working piston 10. The ventilation solenoid valve 27 is switched over to release the clutch. Compressed air flows into the working chamber 11 and the working piston 10 moves to the left. The breathing chamber 12 reduces its volume, and the breathing air flows through the radial channel 30 of the piston rod 7 and the axial channel 13 'of the immersion body 13 via the outside air point 29 and the cover 6 to the outside air.

Zum Wiedereinrasten der Kupplung wird das Belüftungs-Magnetventil 27 abgeschaltet und das Entlüftungs-Magnetventil 28 eingeschaltet. Die Arbeitskammer 11 wird entlüftet. Die in der Kupplung vorgesehenen, bei Lösen der Kupplung gespannten Federn drücken nun über die Druckstange 9 den Arbeitskolben 10 nach rechts in Richtung Ausgangsstellung.To re-engage the clutch, the ventilation solenoid valve 27 is switched off and the ventilation solenoid valve 28 is switched on. The working chamber 11 is vented. The springs provided in the clutch, which are tensioned when the clutch is released, now press the working piston 10 to the right in the direction of the starting position via the push rod 9.

Da sich dabei die Atmungskammer 12 vergrößert, wird von der Arbeitskammer 11 ausgestoßene Druckluft von der Außenstelle 29 her in die Atmungskammer 12 eingesaugt. Die Atmungskammer 12 atmet also Luft von der Arbeitskammer 11. Der Weg der Atemluft führt aber bei jeder Kolbenbewegung immer durch den Axialkanal 13' des Tauchkörpers 13 und den hohlen Sensor 16, 17, 18. Die Atemluft, welche die Steuergeräte-Kammer 22 und den Tauchkörper 13 und den Sensor 16, 17, 18 durchströmt, kann daher den Sensor kühlen.Since the breathing chamber 12 enlarges, compressed air expelled from the working chamber 11 is sucked into the breathing chamber 12 from the external point 29. The breathing chamber 12 thus breathes air from the working chamber 11. However, the path of the breathing air always leads through the axial channel 13 'of the immersion body 13 and the hollow sensor 16, 17, 18 with each piston movement. The breathing air which the control device chamber 22 and the Immersed body 13 and the sensor 16, 17, 18 flows through, can therefore cool the sensor.

Am Ende der Entlüftung der Arbeitskammer 11 erreicht der Arbeitskolben 10 wieder seine rechte Endstellung, in der die Kupplung voll eingerückt ist. Der hohlzylindrische Sensor 16, 17, 18 arbeitet dabei als Stellungs-Sensor für den Arbeitskolben 10, indem er den jeweils zurückgelegten Weg des Arbeitskolbens mißt. Dazu wird an die Spule 17 ein Wechselstrom angelegt, wodurch man bei Veränderung der Eintauchtiefe des Tauchkörpers 13 ein entsprechendes elektrisches Signal erhält, das in einer elektrischen Schalteinrichtung ausgewertet wird. Auf diese Weise können dann neben der Wegmessung auch verschiedene Einrückgeschwindigkeiten gemessen werden.At the end of the venting of the working chamber 11, the working piston 10 again reaches its right end position, in which the clutch is fully engaged. The hollow cylindrical sensor 16, 17, 18 works as a position sensor for the working piston 10 by measuring the distance traveled by the working piston. For this purpose, an alternating current is applied to the coil 17, so that when the immersion depth of the immersion body 13 changes, a corresponding electrical signal is obtained which is evaluated in an electrical switching device. In this way, different engagement speeds can also be measured in addition to the distance measurement.

In Erweiterung der Anlage können anstelle der zwei Magnetventile 27 und 28 auch vier Magnetventile verwendet werden. Damit kann der Arbeitskolben 10 mit Hilfe des hohlzylindrischen Stellungssensors 16, 17, 18 exakt positioniert werden. Dazu werden die vier Magnetventile über die Elektronik direkt gesteuert. Je zwei Magnetventile werden für das Lösen der Kupplung und für das Einrücken der Kupplung verwendet, wobei den jeweils zwei Magnetventilen Blenden mit unterschiedlichen Durchmessern nachgeschaltet werden. Durch eine frequenz- und/oder pulsbreitenmodulierte Ansteuerung der Magnetventile können dann verschiedene Einrückgeschwindigkeiten der Kupplung realisiert werden.As an extension of the system, four solenoid valves can be used instead of the two solenoid valves 27 and 28. The working piston 10 can thus be positioned exactly with the aid of the hollow cylindrical position sensor 16, 17, 18. The four solenoid valves are controlled directly by the electronics. Two solenoid valves are used for releasing the clutch and for engaging the clutch used, the two solenoid valves are followed by orifices with different diameters. Different engagement speeds of the clutch can then be realized by frequency and / or pulse width modulated control of the solenoid valves.

Claims (11)

  1. Working cylinder (1) having a working piston (10) which separates a working chamber (11) from a ventilation chamber (12), having a piston rod (7, 13) penetrating the working chamber (11) and the ventilation chamber (12) and having a sensor (16, 17, 18) for recording the position of the working piston (10), characterised in that the piston rod led through the working chamber (11) is configured as a hollow-cylindrical plunger body (13) with an axial duct (13') and represents an air-conveying connection, leading through a partition (19) bounding the working chamber (11), between the ventilation chamber (12) and an external air location (29) with which the working chamber (11) can be connected when air is removed from it, and that the sensor is configured as a hollow-cylindrical sensor (16, 17, 18) which surrounds the plunger body (13).
  2. Working cylinder according to Claim 1, characterised in that the sensor (16, 17, 18) is located in the region where the piston rod (7, 13) passes through the working chamber.
  3. Working cylinder according to Claim 1 or 2, characterised in that one end of the plunger body (13) engaging in the hollow-cylindrical sensor (16, 17, 18) is connected to a radial duct (30) of the piston rod (7), that the radial duct (30) opens into the ventilation chamber (12), and that the plunger body (13) has an axial passage (31) to the external air location (29) at its other end.
  4. Working cylinder according to Claim 1, 2 or 3, characterised in that the sensor (16, 17, 18) is configured as a tubular sensor with a hollow-cylindrical coil former (16) with coil (17) and a similarly hollow-cylindrical screening sleeve (18) surrounding this coil (17) and that the hollow-cylindrical plunger body (13) consists of an aluminium material.
  5. Working cylinder according to Claim 1, characterised in that the plunger body (13) is connected, at least indirectly, to the working piston (10).
  6. Working cylinder according to Claim 4, characterised in that the coil former (16), together with the coil (17) and the screening sleeve (18), is supported on the partition (19).
  7. Working cylinder according to one of Claims 1 or 6, characterised in that the partition (19) carries, in a parallel-axis arrangement, solenoid valves (27, 28) for supplying air to and removing air from the working chamber (11).
  8. Working cylinder according to one of Claims 1, 6 or 7, characterised in that a pressure-relieved control unit chamber (22) is provided on the side of the partition (19) opposite to the working chamber (11).
  9. Working cylinder according to Claim 8, characterised in that the control unit chamber (22), the sensor (16, 17, 18) and the plunger body (13) are connected to the external air location (29).
  10. Working cylinder according to at least one of Claims 1 to 9, characterised in that when air is removed from the working chamber (11), the ventilation air for the ventilation chamber (12) is brought in from the working chamber (11) via the axial duct (13') of the plunger body (13) and the hollow sensor (16, 17, 18).
  11. Working cylinder according to at least one of Claims 1 to 10, characterised in that the working cylinder (1) is used as the clutch positioner for actuating a clutch for vehicle engines and that the signals of the sensor (16, 17, 18) giving the current position of the working piston (10), its distance traversed and its velocity can be analysed in an electronic switching device for the clutch.
EP91107995A 1990-06-27 1991-05-17 Power cylinder Expired - Lifetime EP0463349B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4020368 1990-06-27
DE4020368A DE4020368A1 (en) 1990-06-27 1990-06-27 WORK CYLINDER

Publications (2)

Publication Number Publication Date
EP0463349A1 EP0463349A1 (en) 1992-01-02
EP0463349B1 true EP0463349B1 (en) 1993-04-28

Family

ID=6409121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107995A Expired - Lifetime EP0463349B1 (en) 1990-06-27 1991-05-17 Power cylinder

Country Status (5)

Country Link
US (1) US5123330A (en)
EP (1) EP0463349B1 (en)
JP (1) JP3160008B2 (en)
DE (2) DE4020368A1 (en)
HU (1) HU206536B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4405914B4 (en) * 1994-02-24 2012-03-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Pneumatic cylinder for actuating a clutch

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Publication number Priority date Publication date Assignee Title
DE59004242D1 (en) * 1989-12-02 1994-02-24 Teves Gmbh Alfred BRAKE POWER AMPLIFIER FOR BRAKE SYSTEMS WITH ANTI-BLOCKING AND / OR DRIVE SLIP CONTROL.
DE4202422A1 (en) * 1992-01-29 1993-08-05 Bosch Gmbh Robert WORKING CYLINDER WITH A WORKING PISTON
US6874405B2 (en) * 2003-01-14 2005-04-05 Haldex Brake Corporation Breather filter for sealed spring brake actuators
ITAR20030013U1 (en) * 2003-06-12 2003-09-10 Faist Componenti S P A PNEUMATIC ACTUATOR WITH ELECTRIC POSITION DETECTOR
US20080000733A1 (en) * 2006-06-14 2008-01-03 Ehrlich Rodney P Spring brake internal venting
CN102352896B (en) * 2011-09-21 2013-03-27 东风汽车有限公司 Clutch actuating mechanism of mechanical automatic transmission
CN103671618A (en) * 2012-09-21 2014-03-26 贵州红林机械有限公司 Clutch actuator assembly for vehicle automatic transmission
CN102889321A (en) * 2012-10-09 2013-01-23 索特传动设备有限公司 Clutch actuating mechanism and vehicle
US20150078926A1 (en) * 2013-09-17 2015-03-19 David A. Krug Regenerative hydraulic lift system

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DE2430394A1 (en) * 1974-06-25 1976-01-08 Knorr Bremse Gmbh DEVICE FOR BLEEDING A SECONDARY ROOM IN BRAKE DEVICES, IN PARTICULAR IN A BRAKE CYLINDER
US4727791A (en) * 1985-07-10 1988-03-01 Diesel Kiki Co., Ltd. Apparatus for controlling a hydraulic single acting cylinder

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US4727791A (en) * 1985-07-10 1988-03-01 Diesel Kiki Co., Ltd. Apparatus for controlling a hydraulic single acting cylinder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4405914B4 (en) * 1994-02-24 2012-03-22 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Pneumatic cylinder for actuating a clutch

Also Published As

Publication number Publication date
HU206536B (en) 1992-11-30
JP3160008B2 (en) 2001-04-23
HU912142D0 (en) 1991-12-30
US5123330A (en) 1992-06-23
JPH04231707A (en) 1992-08-20
DE59100096D1 (en) 1993-06-03
EP0463349A1 (en) 1992-01-02
DE4020368A1 (en) 1992-01-02
HUT59469A (en) 1992-05-28

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