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EP1454055B1 - Pompe a piston radiaux a graissage force - Google Patents

Pompe a piston radiaux a graissage force Download PDF

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Publication number
EP1454055B1
EP1454055B1 EP02764536A EP02764536A EP1454055B1 EP 1454055 B1 EP1454055 B1 EP 1454055B1 EP 02764536 A EP02764536 A EP 02764536A EP 02764536 A EP02764536 A EP 02764536A EP 1454055 B1 EP1454055 B1 EP 1454055B1
Authority
EP
European Patent Office
Prior art keywords
radial piston
piston pump
fuel
sliding bearing
pump 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.)
Expired - Lifetime
Application number
EP02764536A
Other languages
German (de)
English (en)
Other versions
EP1454055A1 (fr
Inventor
Heinz Siegel
Helmut Rembold
Hans-Peter Stiefel
Karl Gmelin
Thomas Fuerst
Thilo Bolz
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
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
Priority claimed from DE10208574A external-priority patent/DE10208574A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1454055A1 publication Critical patent/EP1454055A1/fr
Application granted granted Critical
Publication of EP1454055B1 publication Critical patent/EP1454055B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails

Definitions

  • the invention relates to a radial piston pump for High-pressure fuel production for one Fuel injection system of internal combustion engines, with a drive shaft, wherein the drive shaft a eccentric section and one in a pump housing Stub shaft supported by a first sliding bearing having, preferably with respect to several Drive shaft radially arranged pump elements, with one between the eccentric section and the Pump element arranged ring, and with a Fuel connection in the pump housing.
  • Such an internally supported radial piston pump is, for example. known from DE 197 05 205 A1.
  • the Radial piston pump for conveying fuels with poor lubricating properties, such as or gasoline is to be used, the storage of the Stub shaft in the pump housing and the bearing of the ring on the eccentric portion of the drive shaft a limiting factor for the flow rate and the head represents.
  • This task is in a radial piston pump for High-pressure fuel production for a fuel injection system of internal combustion engines according to the preamble of claim 1, solved by the fact that the first sliding bearing of the entire The fuel port flowing through the fuel port is flowed through.
  • the incoming in the fuel port of the radial piston pump Fuel has a pressure coming from a prefeed pump is provided, from about 4 - 6 bar on. This pressure is regardless of the speed and operating conditions of the Radial piston pump.
  • the invention provides that the first sliding bearing at least one substantially in the direction of the axis of rotation having the drive shaft extending lubrication, so that the from the fuel port in the first sliding bearing flowing fuel 'uniformly over the entire Warehouse distributed and thus the uniform training a lubricant film is favored.
  • a further supplement of the invention provides that the Stub shaft has a center hole, that of the Mittenbohrung a transverse bore branches off, and that the second plain bearing from the transverse bore with fuel is supplied.
  • the fuel can be used for Lubrication of the second sliding bearing in the middle of Bearing surface of the second sliding bearing are introduced and from there flow to the edges of the plain bearing. This favors the formation of a viable lubricating film between ring and eccentric section of the Drive shaft.
  • the second sliding bearing at least one substantially extending in the direction of the axis of rotation of the drive shaft Has lubrication.
  • the eccentric portion or the ring has an annular groove, and that the transverse bore opens into the annular groove, so that the Fuel evenly over the entire circumference of the second Sliding bearing is distributed.
  • Alternative embodiments of the invention provide that the fuel connection in the interior of the housing or opens directly into the first plain bearing. This allows the inventive design of the first and second Plain bearings in different types of Radial piston pumps equally advantageous for use reach.
  • the formation of a stable lubricating film can continue be promoted when the oil groove on the stub shaft and / or the lubrication groove on the eccentric section are performed coiled.
  • Fig. 1 is a first embodiment of a Radial piston pump according to the invention in cross section shown.
  • the radial piston pump consists of a Pump housing 1.
  • the pump housing 1 is a Drive shaft 3 rotatably mounted.
  • the drive shaft 3 is with a stub shaft 5 in a first sliding bearing 7 in Pump housing 1 stored.
  • With her the stub shaft 5 opposite end is the drive shaft 3 in one Lid 9 supported by a ball bearing 11. immediate
  • the drive shaft 3 a eccentric section 13 on.
  • the eccentric portion 13 is of a ring 15, which in a front view (not shown) one polygonal outer contour 19 has surrounded.
  • the ring 15 does not rotate when the drive shaft 3 is rotated, but performs a circular motion.
  • a second one Plain bearing 17 is present, which is pressed with the ring 15.
  • With its polygonal outer contour 19 transmits the Ring 15 giving it from the eccentric section 13 imprinted circular movement on a piston foot plate 21 a pump element 23.
  • the pump element 23 has a cylinder bore 25 and a piston 27 on.
  • About the Kolbenfußplatte 21 is the Plunged piston 27 in an oscillating motion.
  • Fuel is from a fuel connection (not shown) sucked into a working space 29 when the fuel has flowed through the first sliding bearing 7, and subsequently during the so-called delivery stroke with pressure applied.
  • About a high pressure drain (not shown) becomes the high pressure fuel pushed out of the work space 29.
  • the high-pressure fuel pump is supplied via a Fuel connection 31, which in the first sliding bearing. 7 empties.
  • the fuel in the fuel port 31 is from a pre-feed pump, not shown with a Delivery pressure of about 4 - 6 bar in the first sliding bearing. 7 pressed. This results in a very stable training a lubricating film between the pump housing 1 and Stub shaft 5, which is the carrying capacity and life of the first slide bearing 7 significantly increased.
  • Lubrication grooves 33 are over the circumference of the first sliding bearing 7 distributed.
  • the Lubrication grooves 33 can also be designed coiled.
  • the first sliding bearing 7 consists of a in the Housing 1 pressed bushing 37 with pressed Inner ring 36 and the stub shaft 5.
  • the lubrication grooves 33 can either in the inner ring 36 or in the Shaft stump 5 incorporated. When the lubrication grooves 33 are incorporated in the stub shaft 5, the Rotary movement of the stub shaft to promote fuel be exploited in the first sliding bearing 7. This increases the load capacity of the first sliding bearing 7 continues.
  • Fig. 2 is a second embodiment of a Radial piston pump according to the invention in cross section shown. Same components are with the same Reference numerals provided and it applies that concerning the FIG. 1 stated accordingly.
  • the ball bearing 11 is in the Pump housing 1 used.
  • the fuel connection 31 opens into the interior 35. From there flows the fuel via lubrication grooves 33 through the first sliding bearing 7 to the end of the stub shaft 5. From the cross-sectional view of Fig. 2 it can be seen that in the housing 1 a socket 37 is pressed, in which the lubrication grooves 33 are incorporated.
  • the sleeve 37 forms together with the Stub shaft 5, the first sliding bearing. 7
  • the stub shaft 5 has a central bore 39, which of a transverse bore 41 is penetrated.
  • the transverse bore 41 in turn opens into an annular groove 43, which in the eccentric portion 13 of the drive shaft. 3 is incorporated.
  • the annular groove 43 in the ring 15 are incorporated. This alternative is in Fig. 2 not shown.
  • About the center hole 39 and the Transverse bore 41 and the annular groove 43 passes the fuel from the end of the stub shaft 5 to the second sliding bearing 17, which of the eccentric portion 13 and the ring 15th is formed.
  • lubrication grooves 45 incorporated, which is parallel to the axis of rotation 47 of Drive shaft 3 over almost the entire width of the ring 15th extend.
  • the lubrication grooves 45 provide a hydraulic Connection between annular groove 43 and the interior 35 on the the stub shaft 5 side facing away from the ring 15 ago.
  • This measure ensures that always "fresh" fuel from the interior 35 through the first Plain bearing 7 flows and not to a Short circuit flow between the second sliding bearing 17 and first sliding bearing 7 can come.
  • Fig. 3 is a third embodiment of a Radial piston pump according to the invention in cross section shown. Same components are with the same Reference numerals provided and it applies that concerning the FIG. 1 and 2 said accordingly.
  • a coiled lubricating groove 33 available.
  • this Embodiment is characterized by the rotation of the Drive shaft 3 fuel in the first sliding bearing. 7 promoted, which increases its capacity and durability.
  • a coiled lubrication 45th available.
  • the lubrication groove 45 improves the supply of second sliding bearing 17 with fuel and thereby increases its load capacity and service life.
  • Fig. 4 the third shown in Fig. 3 Embodiment in a side view schematically shown. Based on this presentation, the optimal Arrangement of the coiled or straight lubrication grooves 37 and 45 will be explained.
  • FIG. 4 are three um 120 ° offset from one another arranged pump elements 23-I, 23-II and 23-III schematically by their longitudinal axes represented by the eccentric section 13 of the Drive shaft to be actuated.
  • the direction of rotation of Drive shaft is represented by a first arrow 53.
  • the preferred one Space for the arrangement of the lubrication groove 33 is shown in Fig. 4 as second angle range 59 marked. In this way is the carrying capacity of the first sliding bearing 7 in the area their highest stress by the lubrication groove 33 not impaired.
  • the lubrication groove 45 (not shown) in the region of the second sliding bearing 17 has the first angular range 57, the 180 ° to the second Angle range 59 is arranged offset, as advantageous proved.
  • a throttle (not shown) are provided per plain bearing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Claims (18)

  1. Pompe à pistons radiaux destinée à produire une haute pression de carburant pour une installation d'injection de carburant pour moteurs à combustion interne, comprenant un carter de pompe (1) muni d'un arbre d'entraínement (3) qui présente un segment excentrique (13) et un bout d'arbre (5) monté rotatif dans le carter de pompe (1) par un premier coussinet (7), de préférence plusieurs éléments de pompe (23) disposés radialement par rapport à l'arbre d'entraínement (3) et un raccord de carburant (31) prévu dans le carter de pompe (1), le premier coussinet (7) étant traversé de force par le carburant,
    caractérisée en ce que
    le premier coussinet est traversé par la totalité du carburant qui passe dans le raccord de carburant (31).
  2. Pompe à pistons radiaux selon la revendication 1,
    caractérisée en ce qu'
    une bague (15) est disposée entre le segment excentrique (13) et les éléments de pompe (23), la bague (15) est montée rotative sur le segment excentrique (13) par un second coussinet (17), et le second coussinet est traversé de force par le carburant.
  3. Pompe à pistons radiaux selon la revendication 1 ou 2,
    caractérisée en ce que
    sur le côté aval, le second coussinet (17) est traversé par le carburant qui traverse le raccord de carburant (31).
  4. Pompe à pistons radiaux selon une des revendications précédentes,
    caractérisée en ce que
    le premier coussinet (7) présente au moins une rainure de lubrification (33) qui s'étend sensiblement selon la direction de l'axe de rotation (47) de l'arbre d'entraínement (3).
  5. Pompe à pistons radiaux selon une des revendications 2 à 4,
    caractérisée en ce que
    le bout d'arbre (5) présente un perçage central (39), un perçage transversal (41) est dérivé du perçage central (39), et le second coussinet (17) est alimenté en carburant à partir du perçage transversal (41).
  6. Pompe à pistons radiaux selon une des revendications 2 à 5,
    caractérisée en ce que
    le second coussinet (17) présente au moins une rainure de lubrification (45) qui s'étend sensiblement selon la direction de l'axe de rotation (47) de l'arbre d'entraínement (3).
  7. Pompe à pistons radiaux selon la revendication 6,
    caractérisée en ce que
    une liaison hydraulique est établie entre l'au moins une rainure de lubrification (45) et un espace intérieur (35) du carter de pompe (1), sur le côté du second coussinet (17) éloigné du bout d'arbre (5).
  8. Pompe à pistons radiaux selon une des revendications 1 à 6,
    caractérisée en ce que
    le raccord de carburant (31) débouche dans l'espace intérieur (35) du carter de pompe (1).
  9. Pompe à pistons radiaux selon une des revendications 2 à 8,
    caractérisée en ce que
    le segment excentrique (13) ou la bague (15) présente une rainure annulaire (43) et le perçage transversal (41) débouche dans la rainure annulaire (43).
  10. Pompe à pistons radiaux selon une des revendications 5 à 9,
    caractérisée en ce qu'
    un rotor (49) d'une micropompe est logé dans le perçage central (39).
  11. Pompe à pistons radiaux selon une des revendications précédentes,
    caractérisée en ce que
    le raccord de carburant (31) débouche dans le premier coussinet (7).
  12. Pompe à pistons radiaux selon une des revendications 4 à 11,
    caractérisée en ce que
    la rainure de lubrification (33) est prévue sur le bout d'arbre (5) de l'arbre d'entraínement (3).
  13. Pompe à pistons radiaux selon une des revendications 4 à 11,
    caractérisée en ce que
    la rainure de lubrification (33) est prévue sur la bague (37) du premier coussinet (7).
  14. Pompe à pistons radiaux selon une des revendications 6 à 13,
    caractérisée en ce que
    la rainure de lubrification (45) est prévue sur le segment excentrique (13) de l'arbre d'entraínement (3).
  15. Pompe à pistons radiaux selon une des revendications 6 à 14,
    caractérisée en ce que
    la rainure de lubrification (45) est prévue sur le segment excentrique (13) et s'étend sur un premier intervalle angulaire (57) d'environ 60°.
  16. Pompe à pistons radiaux selon la revendication 15,
    caractérisée en ce que
    l'axe médian (23-I) du premier intervalle angulaire est décalé d'environ 90° par rapport au point d'excentricité maximale du segment excentrique (13).
  17. Pompe à pistons radiaux selon une des revendications 15 à 16,
    caractérisée en ce que
    la rainure de lubrification (33) est prévue sur le bout d'arbre (5) dans un second intervalle angulaire (59), et le second intervalle angulaire (59) est décalé d'environ 180° par rapport au premier intervalle angulaire (57).
  18. Pompe à pistons radiaux selon une des revendications 12 à 17,
    caractérisée en ce que la rainure de lubrification (33) tourne en hélice sur le bout d'arbre (5) et/ou la rainure de lubrification (45) tourne en hélice sur le segment excentrique (13).
EP02764536A 2001-12-01 2002-08-06 Pompe a piston radiaux a graissage force Expired - Lifetime EP1454055B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10159099 2001-12-01
DE10159099 2001-12-01
DE10208574 2002-02-21
DE10208574A DE10208574A1 (de) 2001-12-01 2002-02-21 Radialkolbenpumpe
PCT/DE2002/002879 WO2003048564A1 (fr) 2001-12-01 2002-08-06 Pompe a piston radiaux a graissage force

Publications (2)

Publication Number Publication Date
EP1454055A1 EP1454055A1 (fr) 2004-09-08
EP1454055B1 true EP1454055B1 (fr) 2005-11-02

Family

ID=26010700

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02764536A Expired - Lifetime EP1454055B1 (fr) 2001-12-01 2002-08-06 Pompe a piston radiaux a graissage force

Country Status (4)

Country Link
EP (1) EP1454055B1 (fr)
AT (1) ATE308676T1 (fr)
DE (1) DE50204804D1 (fr)
WO (1) WO2003048564A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101529082B (zh) * 2006-10-16 2012-01-11 罗伯特·博世有限公司 具有滚子推杆的活塞泵、尤其是燃料活塞泵

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006504904A (ja) 2002-10-31 2006-02-09 ローベルト　ボツシユ　ゲゼルシヤフト　ミツト　ベシユレンクテル　ハフツング 低圧入口に玉型弁を備えた燃料高圧ポンプ
DE102007012704A1 (de) * 2007-03-16 2008-09-18 Robert Bosch Gmbh Hochdruckpumpe zur Förderung von Kraftstoff mit einer verbesserten Ausbildung der Lageranordnung zur Lagerung der Nockenwelle
ITMI20072259A1 (it) * 2007-11-30 2009-06-01 Bosch Gmbh Robert Pompa di alta pressione
IT1398728B1 (it) * 2009-04-17 2013-03-18 Bosch Gmbh Robert Circuito di lubrificazione di una pompa common rail di alta pressione e pompa common rail di alta pressione
EP2660456B1 (fr) * 2012-05-01 2017-12-06 Delphi International Operations Luxembourg S.à r.l. Pompe à carburant
GB201412187D0 (en) * 2014-07-09 2014-08-20 Delphi International Operations Luxembourg S.�.R.L. Pump assembly
CN115807748A (zh) * 2022-12-07 2023-03-17 北京天玛智控科技股份有限公司 柱塞滑靴组件和多边形轮盘驱动的径向柱塞泵

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4126640B4 (de) * 1991-08-12 2005-06-16 Robert Bosch Gmbh Pumpenanordnung mit einer Vorförderpumpe und einer Radialkolbenpumpe
DE19705205A1 (de) * 1997-02-12 1998-08-13 Bosch Gmbh Robert Kolbenpumpe
EP1101931B1 (fr) * 1999-11-19 2006-08-30 CRT Common Rail Technologies AG Système d'injection à haute pression avec common rail
DE10012306C2 (de) * 2000-03-14 2003-12-24 Bosch Gmbh Robert Verteilereinspritzpumpe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101529082B (zh) * 2006-10-16 2012-01-11 罗伯特·博世有限公司 具有滚子推杆的活塞泵、尤其是燃料活塞泵

Also Published As

Publication number Publication date
ATE308676T1 (de) 2005-11-15
EP1454055A1 (fr) 2004-09-08
DE50204804D1 (de) 2005-12-08
WO2003048564A1 (fr) 2003-06-12

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20040701

AK Designated contracting states

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Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FUERST, THOMAS

Inventor name: GMELIN, KARL

Inventor name: REMBOLD, HELMUT

Inventor name: SIEGEL, HEINZ

Inventor name: STIEFEL, HANS-PETER

Inventor name: BOLZ, THILO

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