EP0123579B1 - Apparatus for hydrostatic compensation of hydraulic pumps and motors of gear-type - Google Patents

Apparatus for hydrostatic compensation of hydraulic pumps and motors of gear-type Download PDF

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Publication number
EP0123579B1
EP0123579B1 EP84400565A EP84400565A EP0123579B1 EP 0123579 B1 EP0123579 B1 EP 0123579B1 EP 84400565 A EP84400565 A EP 84400565A EP 84400565 A EP84400565 A EP 84400565A EP 0123579 B1 EP0123579 B1 EP 0123579B1
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EP
European Patent Office
Prior art keywords
grooves
bearings
compensation
chambers
seals
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
Application number
EP84400565A
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German (de)
French (fr)
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EP0123579A1 (en
Inventor
Roger Laumont
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Hydroperfect International Inc
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Hydroperfect International Inc
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Publication date
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Publication of EP0123579A1 publication Critical patent/EP0123579A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the shaft 8 constitutes the driving shaft and protrudes from the cover 3 while the shaft 9 is completely included inside the pump.
  • a seal 10a is provided on the shaft 8 to prevent any leakage of working liquid.
  • FIG. 4 shows, by way of example and to illustrate the arrangement of the various joints described, two grooves A and B each containing a joint A, respectively B 1 , these grooves being provided one in a cover C, the other in a pad D.

Description

La présente invention concerne les pompes ou moteurs à engrenages dont les pignons portés par des arbres sont disposés entre deux coussinets qui sont appliqués sous pression contre les faces latérales des pignons.The present invention relates to gear pumps or motors whose pinions carried by shafts are arranged between two bearings which are applied under pressure against the lateral faces of the pinions.

La technique antérieure a enseigné de' nom. breux moyens pour appliquer sur les coussinets des forces dites de compensation et le plus souvent la technique antérieure prévoit de délimiter des chambres de compensation entre les coussinets et des couvercles fermant le corps de pompe ou de moteur sur ses côtés latéraux.The prior art taught by name. breux means for applying on the bearings of the so-called compensating forces and most often the prior art provides for defining compensation chambers between the bearings and covers closing the pump or motor body on its lateral sides.

Dans certaines publications, par exemple dans le brevet US-A-3 473 476, des chambres de compensation sont délimitées par des cloisons mises en place dans des rainures, ces cloisons formant en quelque sorte joints entre les coussinets et les couvercles. Il en est de même dans le brevet français FR-A-1 598 392 qui met en oeuvre des joints disposés dans des rainures du corps de pompe ou de moteur, ces joints délimitant des chambres de forme complexe dans lesquelles du liquide est amené à une pression qui correspond à celle qui s'exerce sur la face opposée du coussinet, c'est-à-dire celle tournée vers les pignons.In certain publications, for example in US Pat. No. 3,473,476, compensation chambers are delimited by partitions placed in grooves, these partitions forming in a way joints between the bearings and the covers. It is the same in French patent FR-A-1,598,392 which uses seals arranged in grooves of the pump or motor body, these seals delimiting chambers of complex shape in which liquid is brought to a pressure which corresponds to that which is exerted on the opposite face of the bearing, that is to say that facing the pinions.

D'autres publications montrent encore des joints et chambres analogues. C'est le cas, en particulier, des brevets US-A-3 482 524 et 3142260.Other publications also show similar seals and chambers. This is the case, in particular, of patents US-A-3,482,524 and 3,142,260.

Le brevet US-A-3 578 887 décrit une pompe à engrenages dont les coussinets sont pressés contre les pignons par la pression hydraulique développée dans des chambres de compensation symétriques fermées par des joints déformables continus disposés dans des rainures de couvercles fermant le corps de pompe. Des parties des joints de deux chambres de compensation contiguës sont logées dans une rainure commune.US-A-3,578,887 describes a gear pump whose bearings are pressed against the pinions by hydraulic pressure developed in symmetrical compensation chambers closed by continuous deformable seals arranged in grooves of covers closing the pump body. . Parts of the seals of two adjoining compensation chambers are housed in a common groove.

La Demanderesse a elle-même enseigné, en particulier dans son brevet français FR-A-2215103, une disposition dans laquelle un joint est prévu soit dans les coussinets, soit dans le couvercle pour délimiter des chambres de compensation.The Applicant has itself taught, in particular in its French patent FR-A-2215103, a provision in which a seal is provided either in the bearings or in the cover to delimit compensation chambers.

Les dispositions ci-dessus donnent généralement satisfaction mais se sont révélées imparfaites pour des pompes ou moteurs hydrauliques travaillant sous très haute préssion. En effet, les joints et les cloisons pour les maintenir constituent des ensembles généralement fragiles. De plus, lorsque des cloisons sont prévues, cela limite la surface sur laquelle peut s'exercer la pression de compensation.The above arrangements are generally satisfactory but have been found to be imperfect for hydraulic pumps or motors working under very high pressure. Indeed, the joints and the partitions to maintain them constitute generally fragile assemblies. In addition, when partitions are provided, this limits the surface on which the compensation pressure can be exerted.

L'invention résout ce problème en permettant d'exercer des pressions de compensation sur toute la surface utile des coussinets d'une pompe ou d'un moteur et cela quel que soit le sens de rotation des pignons.The invention solves this problem by making it possible to exert compensating pressures over the entire useful surface of the bearings of a pump or of a motor, regardless of the direction of rotation of the pinions.

Conformément à l'invention, le dispositif pour la compensation hydrostatique de pompes et de moteurs hydrauliques du type à engrenages dans lesquels deux pignons en prise sont montés sur des arbres qui sont supportés par des coussinets ou paliers pouvant coulisser à l'intérieur de la cavité d'un corps de pompe, ou de moteur fermé sur ses côtés latéraux par des couvercles, des chambres de compensation étant prévues entre les coussinets et les couvercles, est caractérisé en ce que les chambres de compensation voisines sont délimitées par des rainures, respective-' ment pratiquées dans les faces en regard de coussinets et couvercles, en ce que ces chambres de compensation voisines ont en commun une portion de leurs contours extérieurs respectifs, en ce que chaque contour extérieur est constitué par celui des bords de la rainure délimitant la chambre de compensation qui est située le plus à l'extérieur par rapport à la chambre de compensation, en ce qu'un côté des rainures des coussinets est aligné avec un côté des rainures du couvercle correspondant et en ce que des joints d'étanchéité déformables sont disposés dans lesdites rainures.According to the invention, the device for hydrostatic compensation of pumps and hydraulic motors of the gear type in which two engaged pinions are mounted on shafts which are supported by bearings or bearings which can slide inside the cavity of a pump or motor body closed on its lateral sides by covers, compensation chambers being provided between the bearings and the covers, is characterized in that the neighboring compensation chambers are delimited by grooves, respectively- 'ment practiced in the facing faces of pads and covers, in that these neighboring compensation chambers have in common a portion of their respective external contours, in that each external contour is constituted by that of the edges of the groove delimiting the chamber which is located furthest outside with respect to the compensation chamber, in that one side of the grooves of the bearings e st aligned with one side of the grooves of the corresponding cover and in that deformable seals are arranged in said grooves.

Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description qui suit.Various other characteristics of the invention will also emerge from the description which follows.

Une forme de réalisation de l'objet de l'invention est représentée, à titre d'exemple non limitatif, au dessin annexé.

  • La figure 1 est une coupe transversale d'une pompe ou moteur hydraulique à engrenages d'un type faisant application de l'invention.
  • La figure 2 est une coupe vue sensiblement suivant la ligne II-II de la fig. 1.
  • La figure 3 est une coupe partielle, en partie schématique, vue sensiblement suivant la ligne III-III de la fig. 2.
  • La figure 4 est une coupe très agrandie d'un détail de la fig. 3.
  • La figure 5 est une élévation d'un des couvercles que comporte la pompe ou moteur des figures précédentes.
  • La figure 6 est une coupe vue suivant la ligne VI-VI de la fig. 5.
An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing.
  • Figure 1 is a cross section of a hydraulic pump or gear motor of a type applying the invention.
  • FIG. 2 is a section seen substantially along line II-II of FIG. 1.
  • Figure 3 is a partial section, partly schematic, seen substantially along line III-III of FIG. 2.
  • FIG. 4 is a very enlarged section of a detail of FIG. 3.
  • Figure 5 is an elevation of one of the covers that includes the pump or motor of the previous figures.
  • Figure 6 is a sectional view along line VI-VI of FIG. 5.

La description qui suit se réfère à une pompe hydraulique à engrenages qui est constituée pour pouvoir fonctionner dans l'un et l'autre des deux sens de rotation possibles. Tout ce qui suit s'applique de la même façon à un moteur hydraulique et, le cas échéant, à une pompe ou à un moteur hydraulique destiné à fonctionner seulement dans un seul sens de rotation. La seule différence existant avec la pompe décrite réside dans la conformation différente que présenteraient alors les chambres ou espaces dits de compensation, cette conformation des chambres ou espaces de compensation propres à un moteur ou une pompe tournant dans un seul sens de rotation étant décrite dans de nombreux documents de la technique.The following description refers to a hydraulic gear pump which is designed to operate in either of the two possible directions of rotation. All of the following applies equally to a hydraulic motor and, where applicable, to a pump or a hydraulic motor intended to operate only in one direction of rotation. The only difference existing with the pump described resides in the different conformation that the so-called compensation chambers or spaces would then have, this conformation of the compensation chambers or spaces specific to a motor or a pump rotating in a single direction of rotation being described in numerous technical documents.

La pompe comporte un corps 1 délimitant une cavité 2 de forme ovoïde.The pump comprises a body 1 delimiting a cavity 2 of ovoid shape.

Le corps 1 est fermé sur chacun de ses deux côtés par des couvercles 3. 4 qui sont reliés au corps 1 par des pions de centrage 5. La cavité 2 contient des coussinets ou paliers 6, 7 pouvant coulisser dans la cavité 2 à frottement doux. Les coussinets 6, 7 supportent des arbres 8 et 9 sur lesquels sont calés des pignons 10 et 11.The body 1 is closed on each of its two sides by covers 3. 4 which are connected to the body 1 by centering pins 5. The cavity 2 contains bearings or bearings 6, 7 which can slide in the cavity 2 with gentle friction. The bearings 6, 7 support shafts 8 and 9 on which pinions 10 and 11 are fixed.

Dans le cas de la pompe décrite, l'arbre 8 constitue l'arbre menant et fait saillie du couvercle 3 tandis que l'arbre 9-est complètement inclus à l'intérieur de la pompe. Un joint d'étanchéité 10a est prévu sur l'arbre 8 pour éviter toute fuite de liquide de travail.In the case of the pump described, the shaft 8 constitutes the driving shaft and protrudes from the cover 3 while the shaft 9 is completely included inside the pump. A seal 10a is provided on the shaft 8 to prevent any leakage of working liquid.

Pour que les coussinets 6, 7 soient toujours maintenus appliqués contre les faces latérales des pignons 10, 11 de la pompe, des conduits 12 traversent les coussinets pour mettre en communication les entredents des pignons 10, 11 avec l'espace de très faible épaisseur qui sépare l'autre face des coussinets des couvercles. De même, si l'on considère le sens de circulation du liquide de travail illustré par la flèche f1 de la fig. 2, les conduits d'admission 12a et de refoulement 12b sont également mis en communication avec l'espace compris entre les couvercles et les paliers.So that the bearings 6, 7 are always kept applied against the lateral faces of the pinions 10, 11 of the pump, conduits 12 pass through the bearings to put the intents of the pinions 10, 11 into communication with the very thin space which separates the other side of the pads from the covers. Similarly, if we consider the direction of circulation of the working liquid illustrated by the arrow f 1 in FIG. 2, the intake 12a and discharge 12b conduits are also placed in communication with the space between the covers and the bearings.

Chaque espace compris entre chaque coussinet et chaque couvercle correspondant est délimité par des joints pour correspondre aux zones de pressions différentes.Each space between each pad and each corresponding cover is delimited by seals to correspond to the zones of different pressures.

La Fig. 2 montre un joint annulaire 13 assurant l'étanchéité entre le couvercle 4 et le corps 1. Des joints 14, 14a pour des chambres de compensation supérieure et inférieure 15, respectivement 15a, un joint médian 16 correspondant à la partie d'engrènement des pignons et deux joints 17, 17a bilatéraux qui délimitent des zones de compensation, d'admission et de refoulement.Fig. 2 shows an annular seal 13 ensuring the seal between the cover 4 and the body 1. Seals 14, 14a for upper and lower compensation chambers 15, respectively 15a, a median seal 16 corresponding to the engagement part of the pinions and two bilateral seals 17, 17a which delimit zones of compensation, intake and discharge.

Dans le mode de réalisation représenté, le joint annulaire 13 est disposé dans une rainure 13, (fig. 5) pratiquée dans chaque couvercle qui présente également des rainures 141, 14a1, 16a pour les joints 14, 14a, 16.In the embodiment shown, the annular seal 13 is arranged in a groove 13 (fig. 5) formed in each cover which also has grooves 14 1 , 14a 1 , 16a for the seals 14, 14a, 16.

Des rainures 171, respectivement 17a1, (fig. 1 à 3), sont prévues dans la face de chaque coussinet 6, 7 tourné vers le couvercle correspondant 3, 4, l'un des bords des rainures 171, 17a, étant aligné avec des bords A" des rainures 141, 14a, et avec des bords de la rainure 16, de chaque couvercle 3, 4 contenant le joint médian 16.Grooves 17 1 , respectively 17a 1 , (fig. 1 to 3), are provided in the face of each pad 6, 7 facing the corresponding cover 3, 4, one of the edges of the grooves 17 1 , 17a, being aligned with edges A "of grooves 14 1 , 14a, and with edges of groove 16, of each cover 3, 4 containing the middle seal 16.

Cette disposition apparaît particulièrement à la fig. 4 qui montre, à titre d'exemple et pour illustrer la disposition des différents joints décrits, deux rainures A et B contenant chacune un joint A, respectivement B1, ces rainures étant prévues l'une dans un couvercle C, l'autre dans un coussinet D.This arrangement appears particularly in FIG. 4 which shows, by way of example and to illustrate the arrangement of the various joints described, two grooves A and B each containing a joint A, respectively B 1 , these grooves being provided one in a cover C, the other in a pad D.

On voit à la fig. 4 que les côtés A', B' des rainures pratiquées dans le couvercle et dans le coussinet sont rigoureusement alignés.We see in fig. 4 that the sides A ′, B ′ of the grooves made in the cover and in the bearing are strictly aligned.

La fig. 4 montre, aussi, que les rainures peuvent être à angle vif car il est avantageux, selon l'invention, que la pression qui s'exerce dans l'espace séparant le couvercle du coussinet s'exerce même à l'intérieur des rainures et, par conséquent, tende à appliquer le joint contenu dans chaque rainure sur la face de l'élément opposé, c'est-à-dire que le joint appliqué contre le coussinet est serré, voire déformé, dans la rainure du couvercle qui le contient et réciproquement. Les parties des joints A1 et B1 contiennent chacune une garniture latérale A", respectivement B", par exemple fabriquée en polyamide, lorsque les joints sont en élastomère. Il est important, de toute façon, que les garnitures ci-dessus soient en une matière plus dure que celle des joints mais présentant un faible coefficient de friction afin que lesdites garnitures ne puissent pas subir un effet d'extrusion dû à la pression qui s'exerce sur les joints.Fig. 4 also shows that the grooves can be at a sharp angle because it is advantageous, according to the invention, that the pressure which is exerted in the space separating the cover of the pad is exerted even inside the grooves and , therefore, tends to apply the seal contained in each groove on the face of the opposite element, that is to say that the seal applied against the bearing is tight, or even deformed, in the groove of the cover which contains it and reciprocally. The parts of the seals A 1 and B 1 each contain a side seal A ", respectively B", for example made of polyamide, when the seals are made of elastomer. It is important, in any case, that the above linings be made of a harder material than that of the seals but having a low coefficient of friction so that said linings cannot undergo an extrusion effect due to the pressure which s 'exercises on the joints.

Comme cela ressort de ce qui précède, en fonctionnement, des pressions différentielles sont développées de façon connue dans les différentes chambres de compensation, et ces pressions s'exercent sur toute la surface des parties des couvercles et coussinets se faisant face sans qu'il n'y ait aucune interruption dans les forces de compensation développées. Par ailleurs, les joints étant disposés dans des rainures complémentaires prévues respectivement dans les couvercles et les coussinets, il en résulte un bon maintien des joints sans aucun risque que les pressions développées dans les chambres de compensation puissent endommager des parties fragiles puisque toute cloison est supprimée, l'isolation entre les chambres de compensation contiguës se faisant seulement par les joints.As is apparent from the above, in operation, differential pressures are developed in a known manner in the different compensation chambers, and these pressures are exerted on the entire surface of the parts of the covers and pads facing each other without it there will be no interruption in the developed compensating forces. Furthermore, the seals being arranged in complementary grooves provided respectively in the covers and the bearings, this results in good maintenance of the seals without any risk that the pressures developed in the compensation chambers may damage fragile parts since any partition is removed. , the insulation between the adjoining compensation chambers is done only by the joints.

Il est avantageux que les rainures 171, 17a, contenant les joints 17, 17a soient évasées à leurs extrémités comme montré en 18 à la fig. 2 et que la partie en élastomère A1 forme un talon 181 pour faire en sorte que les pressions qui s'exercent dans les chambres de compensation, d'admission et de refoulement tendent toujours à maintenir la garniture A" contre le bord externe de la rainure tandis que le talon 181 est lui-même appliqué contre la paroi interne de la cavité ovoïde 2.It is advantageous that the grooves 17 1 , 17a, containing the seals 17, 17a are flared at their ends as shown at 18 in FIG. 2 and that the elastomer part A 1 forms a heel 18 1 so that the pressures exerted in the compensation, intake and discharge chambers always tend to keep the lining A "against the outer edge of the groove while the heel 18 1 is itself applied against the internal wall of the ovoid cavity 2.

Claims (5)

1. Device for the hydrostatic compensation of hydraulic pumps and motors of the gear type, in which two intermeshing gears (10, 11) are mounted on shafts (8, 9) which are supported by bearings (6, 7, D) or bearing blocks (6, 7) slidable within the cavity (2) of a body of a pump, or motor (1) closed on its lateral sides by covers (3, 4, C), compensation chambers (12a, 12b, 15, 15a) being provided between the bearings and the covers (3, 4, C), characterized in that the adjacent com- pensation chambers are delimited by grooves (A, B) respectively provided in the faces facing bearings (D) and covers (C), in that the adjacent compensation chambers (12a. 12b, 15, 15a) have in common a portion of their respective outer' periphery, in that each outer periphery is made by that of the edges (A') of the groove (A) forming the compensation chamber which is placed the most outerly with respect to the compensation chamber, in that a side (A') of the grooves (A) in the bearings is in alignment with one side (B') of the grooves (B) in the corresponding cover (C) and in that deformable tightness seals (Ai, 61) are arranged in said grooves.
2. Device according to claim 1, characterized in that the grooves (A, B) have an acute angle so that the pressures exerted on the compensation chambers delimited by the seals (A1, B1) are applied within the grooves on said sides.
3. Device according to one claims 1 and 2, characterized in that the side of the seals resting on the aligned side (A', B') of the grooves (A, B) is provided with underformable fittings (A", B").
4. Device according to one of claims 1 to 3, characterized in that that of the grooves (17, 18) which opens to the wall of the cavity of the body of the pump or motor has a widened mouth (18) while the seal (17, 17a) has, at this level, a shoulder (181).
5. Device according to one of claims 1 to 4, characterized in that one of the compensation chambers communicates with the inlet duct (12a), an other communicates with the outlet duct (12b), and the remaining compensation chambers (15, 15a) communicate through channels (12) crossing the bearings (6, 7) with the interval between teeth of the gears (10, 11).
EP84400565A 1983-03-22 1984-03-20 Apparatus for hydrostatic compensation of hydraulic pumps and motors of gear-type Expired EP0123579B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304650 1983-03-22
FR8304650A FR2543229B1 (en) 1983-03-22 1983-03-22 DEVICE FOR HYDROSTATIC COMPENSATION OF GEAR TYPE HYDRAULIC PUMPS AND MOTORS

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Publication Number Publication Date
EP0123579A1 EP0123579A1 (en) 1984-10-31
EP0123579B1 true EP0123579B1 (en) 1986-09-10

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EP84400565A Expired EP0123579B1 (en) 1983-03-22 1984-03-20 Apparatus for hydrostatic compensation of hydraulic pumps and motors of gear-type

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US (1) US4527966A (en)
EP (1) EP0123579B1 (en)
JP (1) JPS6011691A (en)
KR (1) KR860000960B1 (en)
AR (1) AR230757A1 (en)
AT (1) ATE22161T1 (en)
AU (1) AU2593684A (en)
BR (1) BR8401311A (en)
CA (1) CA1221876A (en)
CS (1) CS252815B2 (en)
DD (1) DD216768A5 (en)
DE (2) DE3460661D1 (en)
DK (1) DK160084A (en)
ES (1) ES530833A0 (en)
FR (1) FR2543229B1 (en)
HU (1) HUT39840A (en)
IL (1) IL71306A0 (en)
IN (1) IN160317B (en)
NO (1) NO841123L (en)
NZ (1) NZ207553A (en)
RO (1) RO92213B (en)

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FR2574517B1 (en) * 1984-12-10 1988-09-02 Hydroperfect Int SEAL AND ITS APPLICATION TO THE REALIZATION OF HYDROSTATIC COMPENSATION OF HYDRAULIC PUMPS AND MOTORS
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US5022837A (en) * 1989-11-13 1991-06-11 Sta-Rite Industries, Inc. Seal arrangement for a gear machine
EP0563661A1 (en) * 1992-03-19 1993-10-06 J.M. Voith GmbH Internal gear pump with radially movable sealing elements for radial compensation
JPH10274171A (en) * 1997-01-31 1998-10-13 United Dominion Ind Inc Constant positioned cleaning gear pump
JP3932595B2 (en) * 1997-03-12 2007-06-20 株式会社日立製作所 Gear pump
FR2772839B1 (en) 1997-12-19 2000-02-11 Hydroperfect Int FUEL PUMP, ESPECIALLY GASOLINE, IN PARTICULAR FOR THE DIRECT INJECTION OF FUEL INTO AN INTERNAL COMBUSTION ENGINE, ELECTRO-PUMP UNIT CONTAINING SUCH A PUMP AND AUTOMOTIVE VEHICLE EQUIPPED WITH AN ELECTRO-PUMP UNIT
US6902382B2 (en) * 2003-09-11 2005-06-07 Matthew Peter Christensen Gear motor start up control

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KR840008035A (en) 1984-12-12
NZ207553A (en) 1986-07-11
HUT39840A (en) 1986-10-29
RO92213B (en) 1987-07-31
FR2543229A1 (en) 1984-09-28
DE3460661D1 (en) 1986-10-16
CS252815B2 (en) 1987-10-15
ES8500394A1 (en) 1984-11-01
IL71306A0 (en) 1984-06-29
IN160317B (en) 1987-07-04
FR2543229B1 (en) 1985-08-16
CS207284A2 (en) 1987-03-12
ATE22161T1 (en) 1986-09-15
AU2593684A (en) 1984-09-27
DK160084A (en) 1984-09-23
RO92213A (en) 1987-07-30
DE123579T1 (en) 1985-04-25
AR230757A1 (en) 1984-06-29
DD216768A5 (en) 1984-12-19
JPS6011691A (en) 1985-01-21
DK160084D0 (en) 1984-03-20
CA1221876A (en) 1987-05-19
NO841123L (en) 1984-09-24
BR8401311A (en) 1984-10-30
EP0123579A1 (en) 1984-10-31
US4527966A (en) 1985-07-09
KR860000960B1 (en) 1986-07-23
ES530833A0 (en) 1984-11-01

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