EP0263558B1 - Moteur hydraulique à piston avec des moyens pour mesurer la vitesse de rotation - Google Patents

Moteur hydraulique à piston avec des moyens pour mesurer la vitesse de rotation Download PDF

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Publication number
EP0263558B1
EP0263558B1 EP87201880A EP87201880A EP0263558B1 EP 0263558 B1 EP0263558 B1 EP 0263558B1 EP 87201880 A EP87201880 A EP 87201880A EP 87201880 A EP87201880 A EP 87201880A EP 0263558 B1 EP0263558 B1 EP 0263558B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
sensor
revolving member
distributor
rotation
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
EP87201880A
Other languages
German (de)
English (en)
Other versions
EP0263558A3 (en
EP0263558A2 (fr
Inventor
Ivano De Vietro
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.)
Riva Calzoni SpA
Original Assignee
Riva Calzoni SpA
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 Riva Calzoni SpA filed Critical Riva Calzoni SpA
Priority to AT87201880T priority Critical patent/ATE100534T1/de
Publication of EP0263558A2 publication Critical patent/EP0263558A2/fr
Publication of EP0263558A3 publication Critical patent/EP0263558A3/en
Application granted granted Critical
Publication of EP0263558B1 publication Critical patent/EP0263558B1/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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F04B49/103—Responsive to speed
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/12—Parameters of driving or driven means
    • F04B2201/1201—Rotational speed of the axis

Definitions

  • the invention relates to a hydraulic piston motor having means for measuring the speed of rotation.
  • the speed can be directly recorded at the motor by conventional means by attaching a tachometric device to a secondary shaft mechanically connected to the motor shaft, but these embodiments require hydraulic seals and bearings for the secondary shaft, so that the structure becomes complicated and there are problems regarding the sealing-tightness and wear of the rotating parts. These applications also substantially increase the axial dimension of the motor and also greatly increase the costs.
  • the GB patent nevertheless discloses a passive element (pick up) detecting the axial displacement of a member movable inside a chamber with no pressure inside.
  • the magnetic elements to be detected being formed by pills that can be neutralized by oil residue or similar and lost their magnetic power requiring difficult operation for maintenance and replacement of the pills themeselves.
  • the invention provides a hydraulic piston motor which has means for measuring the speed of rotation and comprises a rotating hydraulic distributor adapted to supply hydraulic pressure fluid in cycles to the pistons driving the motor, and having a revolving internal member rotating integrally with the drive shaft and comprising ducts for distributing hydraulic fluid, a sensor being present in a fixed position on the hydraulic distributor and facing the revolving member, the outer surface of which is formed with discontinuities detectable by the sensor which, corresponding to the periodic detection of the aforementioned discontinuties during the rotation of the revolving member, generates a signal at a frequency proportional to the speed of rotation of the member, means for protecting the sensors from the pressure of the hydraulic fluid are provided in the fixed outer casing of the distributor and resilient means for holding the sensor in position and allowing it radial displacement, are present.
  • the senor is an inductive proximity sensor rigidly connected to the fixed external casing of the distributor and facing the revolving member and adapted to generate a signal each time its front faces the discontinuities on the outer surface of the revolving distributor member.
  • the sensitive sensor element is slidingly inserted into an orifice in a sheath of non-magnetic material connected to the distributor casing, the front part of the sheath having a cap of pressure-resistant material abutting the front end of the sensitive element which is held in position by a resilient means pressed against its rear end and connected to the sheath, in which the resilient means allows the sensitive element to slide under limited force inside the sheath in response to deformation in the cap in contact therewith, as a result of the pressure of the hydraulic fluid in the distributor.
  • the sheath cap is made of reinforced plastics
  • the resilient means is a sealing layer of elastomeric material such as silicone resin or the like, so as to provide a resiliently yielding connection of simple structure and limited cost.
  • the resilient means is a helical or cup spring or similar resilient element, one end of which abuts the sensor whereas the other end is connected to the sheath.
  • the discontinuities on the outer surface of the revolving member can comprise a ferromagnetic ring formed with a number of orifices having radial axes, or with equidistant recesses or raised portions on its side surface, the ring being disposed outside the revolving member and integral therewith, or alternatively the discontinuities can comprise a number of orifices having radial axes or equidistant recesses or raised portions formed directly on the surface of the revolving member.
  • the number of discontinuities detectable by the sensor is such that on the circumference along which the discontinuities are disposed on the outer surface of the revolving member, the combined length of the solid portions is equal to the length of the empty portions and the discontinuity is made as small as compatible with the sensitivity of the sensor.
  • a radial piston-type hydraulic motor substantially comprises a frame 1 in which a camshaft 2 is rotatably mounted, a number of radial cylinder-piston drive means, called radial pistons for short, being disposed around the shaft and acting on the eccentric portion 4 thereof and being successively supplied with oil under pressure via respective supply ducts 5 and a distributor 6, thus exerting thrusts on the cam and driving shaft 2 in rotation.
  • a device 7 for recording the speed of rotation of the motor is attached to distributor 6, as shown in detail in Fig. 2.
  • the device comprises an inductive proximity sensor 8 inserted into a non-magnetic metal sheath 9 secured, e.g. by screwing as shown, to the fixed external casing 10 of the distributor.
  • Element 12 can be a ring 14 secured to the exterior of a rotating member 15 of the distributor which is coupled for rotation to shaft 2 via a spindle 16 and comprises oil supply ducts 17.
  • element 12 can be the member 15, which can be directly formed with apertures or notches 13 on its outer cylindrical surface.
  • the sensor 8 could be damaged or its life could be reduced by stresses from the hydraulic pressure fluid inside member 15.
  • the sensitive end of sensor 8 is protected from these stresses by a cap 18 of non-magnetic material, advantageously made of reinforced plastics, which withstands the pressure of the hydraulic fluid without transmitting stresses to the sensor.
  • Sensor 8 is slid into an orifice 19 in sheath 9.
  • the rear end of the sensor is axially secured in the sheath by a seal 20 of elastomeric material, e.g. silicone rubber.
  • seal 20 forms a connection which can resiliently yield.
  • the seal behaves like a spring but is simpler and cheaper to assemble.
  • the seal 20 can be replaced by a helical or cup metal spring or similar resilient means, one end of which bears against the sensor whereas the other end bears against a suitable raised portion of sheath 9.
  • the sensor outputs a signal whose frequency varies with the speed of rotation and can therefore be sent to a display or monitoring unit depending on the use made of the motor.
  • the accuracy of the measurement depends on the number of orifices or notches 13 on member 15, and consequently the number of apertures or notches should be made as large as is compatible with the dimensional requirements of the component.
  • the signal is of the kind shown in Fig. 3 and comprises a succession of peaks corresponding to the successive occasions when the front of the sensor faces the solid parts and the spaces resulting from the orifices or notches 13 in the revolving member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)

Claims (10)

  1. Moteur hydraulique à pistons comportant un dispositif (7) pour mesurer la vitesse de rotation, comprenant un distributeur hydraulique rotatif (6) adapté pour alimenter les pistons (3) entraînant le moteur en un fluide hydraulique sous pression, en cycles, et comportant un organe interne rotatif (15) solidaire de l'arbre d'entraînement (2) et comprenant des conduites (17) pour distribuer le fluide hydraulique, un capteur (8) étant prévu dans une position fixe sur le distributeur hydraulique (6) et placé en regard de l'organe rotatif (15), caractérisé en ce que la surface extérieure (14) de l'organe rotatif est pourvue de discontinuités (13) pouvant être détectées par le capteur (8) qui, en fonction de la détection périodique des discontinuités sus-mentionnées (13) pendant la rotation de l'organe rotatif (15), génère un signal selon une fréquence proportionnelle à la vitesse de rotation de l'organe (15), des moyens (18) pour protéger les capteurs de la pression du fluide hydraulique étant prévus dans le carter extérieur fixe du distributeur, et des moyens élastiques (20) étant prévus pour maintenir le capteur (8) en position, tout en permettant son déplacement radial.
  2. Moteur hydraulique à pistons comportant des moyens pour mesurer la vitesse de rotation selon la revendication 1, caractérisé en ce que le capteur (8) est un capteur de proximité par induction, magnétique ou capacitif, raccordé de manière rigide au carter extérieur fixe (10) du distributeur (6) et situé en regard de l'organe rotatif (15) et adapté pour générer un signal chaque fois que sa face avant (11) fait face aux discontinuités (13) ménagées sur la surface extérieure (14) de l'organe de distribution rotatif (15).
  3. Moteur hydraulique à pistons comportant des moyens pour mesurer la vitesse de rotation selon la revendication 2, caractérisé en ce que l'élément formant capteur sensible (8) est inséré par glissement dans un orifice (19) ménagé dans un manchon (9) d'un matériau non magnétique raccordé au carter (10) du distributeur (6), la partie avant du manchon présentant un chapeau (18) conçu en un matériau résistant à la pression et venant en butée contre l'extrémité avant (11) de l'élément sensible (8) qui est maintenu en position par le moyen élastique (20) comprimé contre son extrémité arrière et raccordé au manchon (9), dans lequel le moyen élastique (20) permet à l'élément sensible de coulisser sous une force limitée à l'intérieur du manchon, en réponse à la déformation dans le chapeau (18) en contact avec ce dernier, sous l'effet de la pression du fluide hydraulique dans le distributeur (6).
  4. Moteur selon la revendication 3, caractérisé en ce que le chapeau (18) du manchon est conçu en plastique renforcé.
  5. Moteur selon la revendication 3, caractérisé en ce que le moyen élastique (20) est une couche d'étanchéité d'un matériau élastomère tel qu'une résine silicone ou similaire.
  6. Moteur hydraulique selon la revendication 3, caractérisé en ce que le moyen élastique (20) est un ressort hélicoïdal ou à disques ou un élément élastique similaire, dont une extrémité vient en butée contre le capteur (8) tandis que l'autre extrémité est raccordée au manchon (9).
  7. Moteur selon les revendications 1 et 2, caractérisé en ce que les discontinuités (13) sur la surface extérieure de l'organe rotatif (15) comprennent un anneau (14), solidaire de ce dernier, présentant plusieurs orifices équidistants (13) dont les axes sont radiaux, et formés sur la surface latérale de l'anneau et à l'extérieur de l'organe rotatif (15).
  8. Moteur selon les revendications 1 et 2, caractérisé en ce que les discontinuités ménagées sur la surface extérieure de l'organe rotatif comprennent un certain nombre d'orifices équidistants (13) dont les axes sont radiaux, et formés directement sur la surface de l'organe rotatif (15).
  9. Moteur selon les revendications 1 et 2, caractérisé en ce que les discontinuités (13) sur la surface extérieure de l'organe rotatif comprennent un anneau (14) présentant plusieurs évidements équidistants (13) ou des parties surélevées sur sa surface latérale, et placé à l'extérieur de l'organe rotatif (15) et solidaire de ce dernier.
  10. Moteur selon les revendications 1 et 2, caractérisé en ce que les discontinuités sur la surface extérieure de l'organe rotatif comprennent un certain nombre d'évidements équidistants ou de parties surélevées formés directement sur la surface latérale de l'organe rotatif.
EP87201880A 1986-10-09 1987-10-01 Moteur hydraulique à piston avec des moyens pour mesurer la vitesse de rotation Expired - Lifetime EP0263558B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87201880T ATE100534T1 (de) 1986-10-09 1987-10-01 Hydraulischer kolbenmotor mit mitteln zum messen der rotationsgeschwindigkeit.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT21951/86A IT1197830B (it) 1986-10-09 1986-10-09 Motore idraulico a pistoni con apparecchiatura di misurazione della velocita' di rotazione
IT2195186 1986-10-09

Publications (3)

Publication Number Publication Date
EP0263558A2 EP0263558A2 (fr) 1988-04-13
EP0263558A3 EP0263558A3 (en) 1990-01-03
EP0263558B1 true EP0263558B1 (fr) 1994-01-19

Family

ID=11189304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201880A Expired - Lifetime EP0263558B1 (fr) 1986-10-09 1987-10-01 Moteur hydraulique à piston avec des moyens pour mesurer la vitesse de rotation

Country Status (4)

Country Link
EP (1) EP0263558B1 (fr)
AT (1) ATE100534T1 (fr)
DE (1) DE3788838T2 (fr)
IT (1) IT1197830B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6486653B2 (en) 2000-12-08 2002-11-26 Clark Equipment Company Mounting arrangement for a wheel speed sensor
CN110985130B (zh) * 2019-12-19 2022-04-01 江苏三蜂机器人有限公司 带转速计量的气动马达

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU584665B2 (en) * 1985-02-25 1989-06-01 Sanden Corporation Rotational speed detecting device for swash plate type compressor
JPH036878Y2 (fr) * 1985-04-11 1991-02-20

Also Published As

Publication number Publication date
ATE100534T1 (de) 1994-02-15
EP0263558A3 (en) 1990-01-03
IT8621951A1 (it) 1988-04-09
IT1197830B (it) 1988-12-06
DE3788838T2 (de) 1994-08-11
EP0263558A2 (fr) 1988-04-13
IT8621951A0 (it) 1986-10-09
DE3788838D1 (de) 1994-03-03

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