EP0281904B1 - Limiteur de course du piston du verrin d'embrayage à friction dans une presse à vis et à embrayage - Google Patents

Limiteur de course du piston du verrin d'embrayage à friction dans une presse à vis et à embrayage Download PDF

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Publication number
EP0281904B1
EP0281904B1 EP88103103A EP88103103A EP0281904B1 EP 0281904 B1 EP0281904 B1 EP 0281904B1 EP 88103103 A EP88103103 A EP 88103103A EP 88103103 A EP88103103 A EP 88103103A EP 0281904 B1 EP0281904 B1 EP 0281904B1
Authority
EP
European Patent Office
Prior art keywords
piston
stroke
metering
valve
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
EP88103103A
Other languages
German (de)
English (en)
Other versions
EP0281904A1 (fr
Inventor
Hubert Landwehr
Dieter Blom
Horst Endter
Hermann-Josef Trimborn
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.)
SMS Hasenclever GmbH
Original Assignee
SMS Hasenclever GmbH
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 SMS Hasenclever GmbH filed Critical SMS Hasenclever GmbH
Publication of EP0281904A1 publication Critical patent/EP0281904A1/fr
Application granted granted Critical
Publication of EP0281904B1 publication Critical patent/EP0281904B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
    • B30B1/188—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means driven by a continuously rotatable flywheel with a coupling arranged between the flywheel and the screw

Definitions

  • the friction clutches in clutch screw presses comprise, in an interior space delimited by the flywheel and a clutch cover attached, an annular disk axially moved by a pressure piston, a clutch disk connected to the spindle and friction bodies, the annular disk being able to be returned to its starting position by springs against the action of the pressure piston.
  • the pressure piston would have to carry out an increasingly large stroke with a correspondingly increasing filling volume, with the disadvantageous consequence of changing operating characteristics of the press.
  • devices are provided for limiting the pressure piston stroke for ventilation and thus also for engaging the clutch.
  • a hydraulically operating stroke limitation device is known (DE-PS 35 03 917), which is arranged in a pressure medium supply line to the pressure cylinder with pressure piston, in a cylinder with a limited stroke movable metering piston and a bypass arranged in parallel to the cylinder with metering piston, the blocking function of the metering piston in the direction of the pressure medium supply is canceled, for which purpose a check valve is provided in the bypass line.
  • the metering piston when the pressure medium is applied, the metering piston first reaches its advanced end position and, with a further increase in pressure, the check valve opens so that the pressure piston is subjected to the full operating pressure.
  • the check valve in the bypass line closes and the pressure piston is relieved.
  • the annular disc and with it the pressure piston is lifted off the friction bodies by the springs acting on the annular disc via tie rods and the clutch is thus released.
  • the stroke of the pressure piston is limited by the limitation of the stroke of the metering piston.
  • valve cone which forms a valve body together with the metering piston, a stop for limiting the engaging stroke being arranged in the way of the valve cone or the valve stem, while the metering piston has an additional freedom of movement for opening the bypass line. It can be arranged according to a further feature of the stop opposing the metering piston in the disengaging end position so that it also acts on the valve stem and holds the valve cone in the closed position in the same direction as the spring.
  • the cylinder receiving the metering piston is connected to the cover closing the cylinder for the pressure piston and in particular protrudes into the pressure piston which is cup-shaped for this purpose.
  • the cylinder of the metering piston can be designed as a guide shaft for the pressure piston, so that the guide and seal are completely separated from one another.
  • the function which is improved by the separate guidance of the pressure piston, can be further improved by, according to a further feature, the pressure piston and the annular disc being designed separately and only being positively connected to one another by the return springs acting on the annular disc, so that the guidance of the pressure piston is not caused by operational heating of the annular disc being affected.
  • the annular disk as is further provided according to the invention, is centered by the pressure piston under a sliding seat which permits the different heating of the annular disk and the pressure piston.
  • the spindle 3 can be rotated in a comb bearing 2, which moves the slide 6 downward with its threaded shaft 4 via the threaded nut 5, while retraction pistons 7 move the slide 6 back into the starting position.
  • a flywheel 8 is rotatably mounted, the drive of which, as is known, is not shown.
  • the pressure piston 14 is received in a cylinder bore 15 in the cover 9, which is closed by a cylinder cover 16.
  • the clutch disc 11 enclosed between the flywheel 8 and the annular disc 12 and equipped with friction bodies 17 forms a friction clutch which is closed by acting on the pressure piston 14 in the cylinder bore 15 and is released when the pressure piston 14 is relieved, for which purpose springs 18 are provided which are located on the clutch cover Support 9 and act via tie rods 19 on the annular disc 12 in the opposite direction to the pressure piston 14.
  • the valve 20 in the pressure line 21 is opened, so that oil under preselected pressure from the hydraulic unit 22 consisting of the electric motor, pump, oil reservoir and accumulator, enters the cylinder bore 15 and pressurizes the pressure piston 14 of the friction clutch.
  • the pressure that is dependent on the preselected oil pressure that can be set on the control valve 23 is reached, i.e.
  • the bore 29 in the cylinder cover 16 and the cylinder bore 15 are separated from one another by a metering piston 30 which can move freely in a metering cylinder 31 connected to the cylinder cover 16 with a limited stroke.
  • the metering cylinder 31 is provided with a flange 32 and is clamped by the cylinder cover 16 in the stepped cylinder bore 15.
  • the dosing cylinder 31 is also provided with annular grooves for receiving guide segments 33 for the cup-shaped pressure piston 14, the cavity 34 of the pressure piston 14 receiving the dosing cylinder 31 and the pressure piston 14 being merely sealed in the cylinder bore 15.
  • the pressure piston 14 guided on the metering cylinder 31 in turn centers the annular disc 12 with attachment 13, which surrounds the pressure piston 14 with a sliding seat (46) which is sufficient to compensate for differences in expansion as a result of the operational heating of the annular disc 12 relative to the pressure piston 14.
  • the bore 29 opens into the metering cylinder 31 on one side, while the other side is open through holes 35 to the cylinder bore 15.
  • the metering piston 30 is axially pierced by a bypass line 36, the upper end of which runs out centrally in the upper end face of the metering piston 30 as a seat surface 37 for a valve cone 38.
  • a valve stem 39 for the valve cone 38 is provided at its end with a thread 40 onto which a nut is screwed, which supports a valve spring 42 via a spring plate 41.
  • the valve spring 42 is supported in a remote bore 43 which penetrates the metering piston 30 centrally, so that under the action of the spring 42 the valve cone 38 is pressed onto the seat surface 37 and closes the bridging line 36, as can be seen in FIG. 2 .
  • the metering piston 30 is acted upon by the pressure oil, the metering piston 30 in the metering cylinder 31 moves downward and displaces the oil enclosed below the metering piston 30 in the metering cylinder 31 through the bores 35 into the cylinder bore 15 and thus acts on the pressure piston 14 of the friction clutch, which is thus closed and initiates a working stroke of the screw press.
  • valve seat 37 is separated from the valve plug 38 and pressure oil flows through the bypass line 36 into the cylinder bore 15 until the pressure in the cylinder bore 15 and the bore 29 of the pressure oil supply line have equalized and the metering piston 30 with the valve seat 37 under the Effect of the valve spring 42 comes to rest against the valve cone 38.
  • a bleed valve 44 is provided.
  • a display device 45 is provided, which is connected to a tie rod 19 to the annular disk 12.
  • a single pressure piston 14 is provided, but can be in its place an annular piston or a plurality of pressure pistons distributed on the circumference of the annular disc can also be provided, in the latter case a plurality of metering pistons, in particular a metering piston for each pressure piston, can be provided.

Landscapes

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

Claims (6)

1. Dispositif limiteur de course, pour le piston de poussée d'un embrayage à friction reliant une vis (3) et une roue-volant (6) d'une presse à vis et embrayage, l'embrayage englobant, dans un espace intérieur bordé par la roue-volant (8) et par un couvercle rapporté (9), un plateau annulaire (12) déplacé axialement par le piston de poussée et un disque d'embrayage (11) lié à la vis ainsi que des corps de friction (17), le plateau annulaire (12) pouvant être ramené à sa position intiale par des ressorts (16), contre l'action du piston de poussée (14), un piston doseur (30) mobile avec une course limitée étant prévu dans la conduite d'alimentation de fluide de pression (21 allant au piston de poussée (15), afin de limiter la course de celui-ci pour le desserrage, et une conduite de pontage (36) munie d'une valve de remplissage (37, 38) étant prévue dans la région du piston doseur, cette conduite supprimant conditionnellement la fonction d'arrêt du piston doseur en direction de l'amenée de fluide de pression, caractérisé par le fait que la conduite de pontage (36) traverse le piston doseur (30), axialement d'une surface terminale à l'autre, et est munie d'un siège de soupape (37) pour un cône de soupape (38) agencé dans le piston doseur (30) et chargé par ressort, ce cône formant avec le piston doseur (30) un corps-soupape, et par le fait qu'une butée pour limiter la course de mise en prise est agencée sur le trajet du cône de soupape (38) ou encore de la tige de soupape (39), tandis que le piston doseur (30) présente une liberté de mouvement allant au-delà, pour l'ouverture de la conduite de pontage (36).
2. Dispositif limiteur de course selon revendication 1, caractérisé par le fait que, dans la position extrême de débrayage, une deuxième butée agissant sur le cône de soupape (38) s'oppose au piston doseur et fixe la position extrême du piston doseur (30) et, dans la même direction que le ressort (42), maintient le cône de soupape (38) en position de fermeture.
3. Dispositif limiteur de course selon revendication 1 ou 2, caractérisé par le fait que le cylindre (31) recevant le piston doseur (30) est lié au couvercle (16) fermant le cylindre (15) pour le piston de poussée (14) et déborde dans le cylindre de poussée (14) réalisé en forme de godet (34).
4. Dispositif limiteur de course selon revendication 3, caractérisé par le fait que le cylindre (31) du piston doseur (30) est réalisé en tant que tige de guidage (33) pour le piston de poussée (14).
5. Dispositif limiteur de course selon revendication 4, caractérisé par le fait que le piston de poussée (14) et le plateau annulaire (12) sont séparés mais sont toutefois liés par serrage par des ressorts de rappel (18) agissant sur le plateau annulaire (12).
6. Dispositif limiteur de course, caractérisé par le fait que le plateau annulaire (12) est centré par le piston de poussée (14) avec une portée de coulissement (46) autorisant un échauffement différent du plateau annulaire (12) et du piston de poussée (14).
EP88103103A 1987-03-10 1988-03-02 Limiteur de course du piston du verrin d'embrayage à friction dans une presse à vis et à embrayage Expired - Lifetime EP0281904B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3707676 1987-03-10
DE3707676 1987-03-10
DE3718246 1987-05-29
DE3718246A DE3718246C1 (de) 1987-03-10 1987-05-30 Hubbegrenzungsvorrichtung fuer den Druckkolben zur Reibungskupplung in einer Kupplungsspindelpresse

Publications (2)

Publication Number Publication Date
EP0281904A1 EP0281904A1 (fr) 1988-09-14
EP0281904B1 true EP0281904B1 (fr) 1990-11-22

Family

ID=25853303

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103103A Expired - Lifetime EP0281904B1 (fr) 1987-03-10 1988-03-02 Limiteur de course du piston du verrin d'embrayage à friction dans une presse à vis et à embrayage

Country Status (4)

Country Link
US (1) US4850215A (fr)
EP (1) EP0281904B1 (fr)
DE (2) DE3718246C1 (fr)
ES (1) ES2019417B3 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244412B1 (en) * 1999-07-29 2001-06-12 The Minster Machine Company Automatic clutch torque control for a mechanical press
US7080595B2 (en) * 2002-05-16 2006-07-25 Gebr. Schmidt Fabrik für Feinmechanik GmbH & Co. KG Manually operated press
CN1302913C (zh) * 2003-12-10 2007-03-07 杜如虚 二自由度机械式可控压力机床
CN102398377B (zh) * 2011-12-01 2015-01-28 山东金箭精密机器有限公司 一种滑块调节螺纹锁紧结构
CN102581149B (zh) * 2012-02-23 2014-08-20 西安交通大学 一种伺服电机飞轮储能式无铆钉连接装置及其连接方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095684A (en) * 1976-10-13 1978-06-20 Caterpillar Tractor Co. Fluid operated clutch
US4181003A (en) * 1978-09-12 1980-01-01 Kononov Ivan V Hydraulic screw press drive
DE3102665A1 (de) * 1981-01-28 1982-08-12 G. Siempelkamp Gmbh & Co, 4150 Krefeld Spindelpresse mit staendig umlaufender schwungscheibe
US4563889A (en) * 1983-03-17 1986-01-14 Sms Hasenclever Maschinenfabrik Gmbh Screw press
DE3346329A1 (de) * 1983-12-22 1985-07-04 Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen Spindelpresse mit einer schaltkupplung und einem ununterbrochen umlaufenden schwungrad
DE3425332A1 (de) * 1984-07-10 1986-01-16 SMS Hasenclever Maschinenfabrik GmbH, 4000 Düsseldorf Spindelpresse
DE3503917C1 (de) * 1985-02-06 1986-03-27 G. Siempelkamp Gmbh & Co, 4150 Krefeld Druckmittelbetaetigbare Reibungskupplung einer Spindelpresse
DE3505935C2 (de) * 1985-02-21 1987-02-12 Langenstein & Schemann GmbH, 8630 Coburg Spindelpressen-Kupplung mit Kapselung

Also Published As

Publication number Publication date
EP0281904A1 (fr) 1988-09-14
US4850215A (en) 1989-07-25
ES2019417B3 (es) 1991-06-16
DE3718246C1 (de) 1988-07-07
DE3861102D1 (de) 1991-01-03

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