EP1091096A1 - Vorrichtung zur Drehzahlerfassung von einer Nockenwelle für Brennkraftmaschine - Google Patents

Vorrichtung zur Drehzahlerfassung von einer Nockenwelle für Brennkraftmaschine Download PDF

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Publication number
EP1091096A1
EP1091096A1 EP00121777A EP00121777A EP1091096A1 EP 1091096 A1 EP1091096 A1 EP 1091096A1 EP 00121777 A EP00121777 A EP 00121777A EP 00121777 A EP00121777 A EP 00121777A EP 1091096 A1 EP1091096 A1 EP 1091096A1
Authority
EP
European Patent Office
Prior art keywords
pulley
magnetic ring
collar
ring
connecting portion
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.)
Withdrawn
Application number
EP00121777A
Other languages
English (en)
French (fr)
Inventor
Flavio Coscia
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.)
RFT SpA
Original Assignee
RFT 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 RFT SpA filed Critical RFT SpA
Publication of EP1091096A1 publication Critical patent/EP1091096A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups

Definitions

  • the present invention relates to a system for detecting the rotation speed of an internal combustion engine camshaft, and to an integrated assembly usable in such a system and comprising a sound wheel and a timing pulley of an internal combustion engine.
  • Devices for detecting the relative speed of two relatively rotating members are commonly used, particularly in the car industry, and comprise a so-called "sound wheel", i.e. a ring with magnetic gaps, and a sensor for detecting the magnetic variations generated by the gaps on the sound wheel traveling past the sensor.
  • sound wheels defined by toothed metal wheels : the sensor is located at the peripheral edge of the toothed wheel, and the alternating solids (teeth) and voids (gaps between the teeth) generate a signal corresponding to the rotation speed of the sound wheel (and, hence, of the member connected to the sound wheel with respect to the sensor).
  • Devices of this type are widely used, for example, for detecting the rotation speed of vehicle wheels (to control, for example, intervention of braking or traction control systems).
  • the best position in which to set up the detecting device is at the pulley supporting the timing belt (for connection to the drive shaft), which, as is known, must be a toothed belt to ensure precise operation of the timing system.
  • the very presence of the toothed timing belt interferes with operation of the detecting device, this disturbing the signal reaching the sensor. In other words, the teeth on the belt confuse the signal generated by the toothed wheel defining the sound wheel, and so disturb the sensor reading.
  • a system for detecting the rotation speed of an internal combustion engine camshaft comprising a toothed timing pulley fittable to said camshaft; a sound wheel carried integrally by said pulley; and a speed sensor for detecting a signal generated by the rotation of said sound wheel, and fittable to a housing structure fixed with respect to said camshaft; the system being characterized in that said sound wheel comprises a substantially rigid supporting ring fitted integrally to said pulley; and a magnetic ring made of magnetized polymer material and carried by said supporting ring.
  • the invention also relates to an integrated assembly comprising a toothed timing pulley of an internal combustion engine, and a sound wheel; characterized in that said sound wheel comprises a substantially rigid supporting ring fitted integrally to said pulley; and a magnetic ring made of magnetized polymer material and carried by said supporting ring.
  • the invention therefore provides for a detecting system which is not only highly efficient and reliable, but also compact, cheap and easy to produce, and easy to assemble.
  • the particular characteristics and the location of the sound wheel with respect to the timing pulley provide for obtaining a strong, highly accurate signal, far superior to that of conventional toothed wheel.
  • the effect on the sensor of interference generated by the toothed timing pulley and belt being located close to the sensor-sound wheel assembly is greatly reduced.
  • the invention therefore also extends to the use of a sound wheel comprising a magnetic ring made of magnetized polymer material and connecting means for connection to a timing pulley of an internal combustion engine to form systems for detecting the rotation speed of a camshaft of said engine.
  • number 1 indicates as a whole a system for detecting the rotation speed of a camshaft 2 of a known internal combustion engine not described or shown in detail for the sake of simplicity.
  • one longitudinal end 3 of camshaft 2 is fitted with a toothed pulley 4 for a known timing belt (not shown) : as is known, in fact, correct operation of the timing system requires a toothed connection between the drive shaft and camshaft.
  • Pulley 4 which is substantially known, has a number of teeth 6 on a radially outer lateral surface 5, and is housed inside a compartment 7 defined by a housing structure 8 integral with the engine and closed by a cover 9.
  • Pulley 4 is fitted integrally with a sound wheel 10, which cooperates with a sensor 11 to generate a signal indicating the rotation speed of pulley 4 (and, hence, the camshaft 2 to which pulley is fitted).
  • sound wheel 10 comprises a substantially rigid supporting ring 12 fitted integrally to pulley 4; and a magnetic ring 13 made of magnetized polymer material and fitted integrally to supporting ring 12.
  • supporting ring 12 made for example of shaped sheet metal, has a substantially right-S-shaped radial section, and comprises a cylindrical annular connecting portion 14 for connection to pulley 4 and fitted with radial interference inside a peripheral edge 15 of pulley 4; a cylindrical collar 16 coaxial and concentric with, but offset laterally with respect to, pulley 4 and annular connecting portion 14; and a connecting portion 17 between and perpendicular to annular connecting portion 14 and collar 16.
  • Collar 16 is located radially outwards of annular connecting portion 14 and laterally with respect to peripheral edge 15 of pulley 4.
  • Magnetic ring 13 is connected integrally to and evenly covers a radially outer lateral surface 18 of collar 16 : for example, the polymer material from which magnetic ring 13 is made is bonded in known manner at the curing stage to the radially outer lateral surface 18 of collar 16.
  • the polymer material from which magnetic ring 13 is made is also magnetized in known manner so as to generate, as it rotates, a periodic signal detectable by sensor 11.
  • Magnetic ring 13 is cylindrical, is located with its central axis 19 coincident with the axis of rotation of pulley 4 (and therefore with the axis of camshaft 2), extends axially beyond an axial end edge 20 of pulley 4, and has a radially outer lateral surface 21 substantially flush with an envelope surface of teeth 6 of pulley 4 (i.e. the tips of teeth 6 are located at the radially outer lateral surface 21 of magnetic ring 13).
  • Sensor 11 (known) is housed through a wall of housing structure 8 so as to be positioned radially with respect to magnetic ring 13, and to face, from a small predetermined radial distance, the radially outer lateral surface 21 of magnetic ring 13.
  • Pulley 4 and sound wheel 10 therefore define, according to the invention, an integrated assembly 22 which can be preassembled easily and then fitted to the engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Pulleys (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP00121777A 1999-10-06 2000-10-05 Vorrichtung zur Drehzahlerfassung von einer Nockenwelle für Brennkraftmaschine Withdrawn EP1091096A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI992090 1999-10-06
IT1999MI002090A IT1313774B1 (it) 1999-10-06 1999-10-06 Sistema di rilevamento della velocita' di rotazione di un albero acamme di un motore a combustione interna.

Publications (1)

Publication Number Publication Date
EP1091096A1 true EP1091096A1 (de) 2001-04-11

Family

ID=11383733

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00121777A Withdrawn EP1091096A1 (de) 1999-10-06 2000-10-05 Vorrichtung zur Drehzahlerfassung von einer Nockenwelle für Brennkraftmaschine

Country Status (2)

Country Link
EP (1) EP1091096A1 (de)
IT (1) IT1313774B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517934A (en) * 1979-07-26 1985-05-21 Volkswagenwerk Aktiengesellschaft Controllable camshaft for a drive, preferably an internal combustion engine
EP0321809A1 (de) 1987-12-21 1989-06-28 BBC Brown Boveri AG Verfahren für die Verbrennung von flüssigem Brennstoff in einem Brenner
JPH04128522A (ja) * 1990-09-17 1992-04-30 Mazda Motor Corp エンジンの回転センサ取付構造
US5549091A (en) * 1992-09-30 1996-08-27 Honda Giken Kogyo Kabushiki Kaisha 4-cycle engine and magnetic sensor
JPH08312512A (ja) * 1995-05-22 1996-11-26 Daihatsu Motor Co Ltd 内燃機関における点火時期タイミング等の検出装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4517934A (en) * 1979-07-26 1985-05-21 Volkswagenwerk Aktiengesellschaft Controllable camshaft for a drive, preferably an internal combustion engine
EP0321809A1 (de) 1987-12-21 1989-06-28 BBC Brown Boveri AG Verfahren für die Verbrennung von flüssigem Brennstoff in einem Brenner
JPH04128522A (ja) * 1990-09-17 1992-04-30 Mazda Motor Corp エンジンの回転センサ取付構造
US5549091A (en) * 1992-09-30 1996-08-27 Honda Giken Kogyo Kabushiki Kaisha 4-cycle engine and magnetic sensor
JPH08312512A (ja) * 1995-05-22 1996-11-26 Daihatsu Motor Co Ltd 内燃機関における点火時期タイミング等の検出装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 016, no. 391 (M - 1298) 19 August 1992 (1992-08-19) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31) *

Also Published As

Publication number Publication date
ITMI992090A0 (it) 1999-10-06
ITMI992090A1 (it) 2001-04-06
IT1313774B1 (it) 2002-09-17

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