EP0263558A2 - Hydraulischer Kolbenmotor mit Mitteln zum Messen der Rotationsgeschwindigkeit - Google Patents

Hydraulischer Kolbenmotor mit Mitteln zum Messen der Rotationsgeschwindigkeit Download PDF

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Publication number
EP0263558A2
EP0263558A2 EP87201880A EP87201880A EP0263558A2 EP 0263558 A2 EP0263558 A2 EP 0263558A2 EP 87201880 A EP87201880 A EP 87201880A EP 87201880 A EP87201880 A EP 87201880A EP 0263558 A2 EP0263558 A2 EP 0263558A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic
revolving member
sensor
distributor
discontinuities
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.)
Granted
Application number
EP87201880A
Other languages
English (en)
French (fr)
Other versions
EP0263558A3 (en
EP0263558B1 (de
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/de
Publication of EP0263558A3 publication Critical patent/EP0263558A3/en
Application granted granted Critical
Publication of EP0263558B1 publication Critical patent/EP0263558B1/de
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 the 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. There is therefore a need for a motor in which the speed of rotation can be detected by a device which does not add to the dimensions of the motor structure and also operates without mechanical contact with the rotating parts of the motor, thus eliminating the problems regarding sealing-­tightness and wear.
  • 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 being present for protecting the sensors from the pressure of the hydraulic fluid in the fixed outer casing of the distributor.
  • 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)
EP87201880A 1986-10-09 1987-10-01 Hydraulischer Kolbenmotor mit Mitteln zum Messen der Rotationsgeschwindigkeit Expired - Lifetime EP0263558B1 (de)

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

Publications (3)

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

Family

ID=11189304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201880A Expired - Lifetime EP0263558B1 (de) 1986-10-09 1987-10-01 Hydraulischer Kolbenmotor mit Mitteln zum Messen der Rotationsgeschwindigkeit

Country Status (4)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046694A2 (en) * 2000-12-08 2002-06-13 Clark Equipment Company Wheel speed sensor mount
CN110985130A (zh) * 2019-12-19 2020-04-10 江苏三蜂机器人有限公司 带转速计量的气动马达

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173261A (en) * 1985-02-25 1986-10-08 Sanden Corp Swash plate compressor
EP0199512A2 (de) * 1985-04-11 1986-10-29 Sanden Corporation Verdichter mit Rotationsdetektor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2173261A (en) * 1985-02-25 1986-10-08 Sanden Corp Swash plate compressor
EP0199512A2 (de) * 1985-04-11 1986-10-29 Sanden Corporation Verdichter mit Rotationsdetektor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002046694A2 (en) * 2000-12-08 2002-06-13 Clark Equipment Company Wheel speed sensor mount
US6486653B2 (en) 2000-12-08 2002-11-26 Clark Equipment Company Mounting arrangement for a wheel speed sensor
WO2002046694A3 (en) * 2000-12-08 2003-01-30 Clark Equipment Co Wheel speed sensor mount
CN110985130A (zh) * 2019-12-19 2020-04-10 江苏三蜂机器人有限公司 带转速计量的气动马达

Also Published As

Publication number Publication date
EP0263558A3 (en) 1990-01-03
IT1197830B (it) 1988-12-06
EP0263558B1 (de) 1994-01-19
DE3788838D1 (de) 1994-03-03
ATE100534T1 (de) 1994-02-15
DE3788838T2 (de) 1994-08-11
IT8621951A0 (it) 1986-10-09
IT8621951A1 (it) 1988-04-09

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