FR2781522A1 - Regulation of position of angular position indicator on engine crankshaft used to control fuel injection and ignition timing, includes the angular position indicator and the detector being adjusted - Google Patents

Abstract

The angular position indicator has a detector that is attached to the engine block and allows the angular position indicator (9) to be adjusted relative the crankshaft (3) and locked in the set position. The position of the detector can also be adjusted before it is locked in its set position.

Description

1 "Method for adjusting two parts. In particular method and device

  for adjusting an angular position indicator means of a crankshaft of an engine "The present invention relates to a method of adjusting one with respect to the other of two parts belonging to a set of parts connected to each other and more particularly a method and a device for adjusting an angular position indicator means connected to the crankshaft of an engine, relative to a sensor for detecting

indications of this indicator means.

  Currently, to detect the angular position of a crankshaft of an engine, a toothed disc is fixed on the flywheel carried by the crankshaft and a sensor for detecting the passage of these teeth on the clutch housing is installed. Given the manufacturing tolerances, dispersions appear in the positioning of the sensor relative to the tooth disc, which are due to the succession of

  intermediate parts which connect the sensor to the tooth disc.

  As the information which results from the sensor can advantageously be used in particular to initiate injection in a diesel engine or to initiate injection and ignition in a petrol engine, there is therefore dispersion of injection timing. and the ignition between the different engines produced, which adversely affect the proper functioning of the engines and in particular

  good combustion of fuels.

  The object of the present invention is in particular to reduce by

such dispersions.

  First of all, the subject of the present invention is a method for adjusting an angular position indicator means connected to the crankshaft of an engine, relative to a sensor for detecting indications of this indicator means, this sensor being capable of '' be mounted on a

organ of said motor.

  According to the invention, this method consists in providing an angular position indicator means angularly adjustable relative to said crankshaft and capable of being secured to the latter in a set position; and further comprises wedging in a determined angular position 1 said crankshaft relative to the aforementioned engine member, wedging in a determined angular position said angular position indicator means relative to said member, then securing said

  angular position indicator means and said crankshaft.

  According to the invention, the method preferably consists of wedging said angular position indicator means relative to the part of said member receiving said sensor in a determined angular position. According to a variant of the invention, the method consists in providing a steering wheel which is angularly adjustable relative to the crankshaft and capable of being secured to the latter in a set position, said angular position indicator means being fixed on said flywheel; and consists of wedging in a determined angular position said flywheel by

  report to said member, then to secure said flywheel and said crankshaft.

  According to a variant of the invention, the method consists in providing an angular position indicator means angularly adjustable relative to a flywheel carried by the crankshaft and capable of being secured to the latter in a set position, said flywheel being fixed on said crankshaft; and consists of wedging in a determined angular position said indicator means with respect to said

  steering wheel, and then to join said indicator means and said steering wheel.

  According to the invention, the method preferably consists in angularly wedging said crankshaft relative to said engine member by means of a positioning rod engaging in an orifice of this

organ.

  According to the invention, the method preferably consists in angularly wedging said angular position indicator means with respect to

  said organ by means of a positioning rod.

  According to the invention, the angular position indicator means is preferably a disc with radial teeth and the method preferably consists in angularly wedging said tooth wheel relative to said member by means of a positioning rod against which it is brought to bear. a flank of a tooth of said disc corresponding to a signal from the

  sensor taken into account later.

  1 According to the invention, said member is preferably constituted by

a casing of said motor.

  According to the invention, said positioning rod of said disc is preferably engaged in an orifice of said member, intended for receiving and fixing said sensor. More generally, the subject of the present invention is a method of adjusting one with respect to the other of two parts belonging to a set of parts connected to each other and

  interconnected by at least one piece.

  According to the invention, this method consists of wedging said parts to be adjusted with respect to a reference part and then securing them in the

set position.

  In addition, the present invention also relates to a device for detecting the angular position of the crankshaft of an engine.

carrying a steering wheel.

  According to the invention, this device comprises an angular position indicator means carried by said flywheel, a sensor for detecting the indications of this indicator means, carried by a motor casing and

  means for adjusting said indicator means with respect to said crankshaft.

  According to the invention, said adjustment means preferably comprise angularly adjustable fixing means of said steering wheel

on said crankshaft.

  According to the invention, said adjustment means preferably comprise angularly adjustable fixing means of said means

indicator on said steering wheel.

  According to the invention, said adjustment means preferably comprise wedging means in a determined angular position

  said crankshaft relative to said casing.

  According to the invention, said wedging means preferably comprise a positioning rod engaging in an orifice of said casing and capable of cooperating with a determined part of said crankshaft. According to the invention, said adjustment means preferably comprise wedging means in a determined angular position

  1 of said indicator means with respect to said flywheel.

  According to the invention, said wedging means preferably comprise a positioning rod engaging in an orifice of said casing provided for the reception and fixing of said sensor and capable of cooperating with part of said indicating means. According to the invention, said indicator means is preferably a

disc with radial teeth.

  According to the invention, said fixing means comprise

  preferably screws passing through enlarged passages.

  The present invention will be better understood from the study of a method and a device for adjusting and mounting a sensor for detecting indications of an angular position indicator means connected to the crankshaft of an internal combustion engine. motor vehicle, described by way of non-limiting example in which - Figure 1 shows a side view of an engine, partially in section; - Figure 2 shows a side view of the motor of Figure 1, partially in section, in an intermediate mounting position; - And Figure 3 shows an end view of the engine as

shown in figure 2.

  Referring to FIG. 1, it can be seen that a motor vehicle internal combustion engine 1 has been partially represented which comprises a crankcase 2 in which a crankshaft 3 extends, one end of which carries, outside the crankcase 2, a flywheel 4. For this purpose, the end of the crankshaft 3 has a plate 5 against which a radial disc 6 of the flywheel 4 is fixed by means of a multiplicity of axial screws 7 distributed around its periphery, the disc 6 having orifices

  through 8 for the passage of screws 7.

  On the face of the plate 6 facing the casing 2, is fixed a disc or a crown 9 with radial teeth 10 distributed over its entire periphery. The casing 2 of the motor 1 has externally, on one side, a boss 11 which has an axial through hole 12 in which is mounted a sensor 13 capable of detecting the passage in front of its 1 end of the teeth 10 of the disc 9 carried by the flywheel 4, this sensor 13 being fixed to the boss 11 by any suitable means and having an electrical connection wire 14 for the transmission of the electrical signals

correspondents to a computer.

  Referring to Figures 2 and 3, we will now describe how we can proceed to adjust and fix in a position

  desired tooth disc 9 and sensor 14.

  First, we mount the flywheel 4 with the disc 9 with teeth

  on the plate 5 of the crankshaft 3, without blocking the screws 7.

  Then, a positioning rod 15 is radially engaged in a through hole 16 of the lower wall 17 of the casing 2 and the end 18 of this rod 15 is radially engaged in an orifice 19 of part of the crankshaft 3, at the inside of the casing 2, for example an orifice 19 formed in a counterweight 19a of the crankshaft 3. In doing so, the crankshaft 3 is angularly wedged relative to the casing 2 in a

  predetermined angular position.

  Next, a positioning rod 20 is axially engaged in the orifice 12 of the external boss 11 of the casing 2, the end of which has a positioning finger 21 which engages between two teeth

  10a and 10b of the toothed disc 9 of the flywheel 4.

  Assuming that the corresponding flank of the tooth 10a of the tooth disc 9 constitutes a reference tooth of angular position, the handwheel 4 is rotated until this tooth 10a abuts against the end finger 21 of the positioning rod 20. For this, provision has been made for the orifices 8 of the plate 6 of the flywheel 4 to be

  oversized with respect to the diameter of the rod of the fixing screws 7.

  This position in abutment corresponding to a setting in a predetermined angular position of the disc 9 relative to the casing 2 having been reached, the flywheel 4 is permanently secured to the crankshaft

  3 by blocking the fixing screws 7.

  We can then remove the positioning rod 15 and install a plug in the orifice 16 of the casing 2, remove the positioning rod 20 and install the sensor 13 in its place as we have

previously described.

  1 Of course, the side of the particular tooth 10a of the disc 9 used to carry out the adjustment described above corresponds to a signal from the sensor 13 which will be taken into account later, this taking into account being able to occur either on a rising edge or on a falling edge of the signal delivered by the sensor 13. It follows from the above that the relative position of the tooth disc 9 carried by the flywheel 4 relative to the crankshaft 3 and relative to the sensor 13 results directly from the adjustment as above described from the tooth disc 9 relative to the sensor 13 using

  only casing 2 as a reference part.

  Thus, the indications or signals delivered by the sensor 13 will be in direct correspondence with the angular position of the crankshaft 3 relative to the casing 13, without impact of the dimensional variations and the manufacturing tolerances of the various intermediate parts mechanically connecting the toothed disc 9 and the

sensor 13.

Claims (19)

I CLAIMS   1. Method for adjusting an angular position indicator means connected to the crankshaft of an engine, relative to a sensor for detecting indications of this indicator means, this sensor being capable of being mounted on a member of said engine, characterized by the fact that it consists in: providing an angular position indicator means (9) angularly adjustable with respect to said crankshaft (3) and capable of being secured to the latter in a set position; and that it consists: in stalling in a determined angular position said crankshaft (3) relative to the aforementioned member (2) of the engine, in stalling in a determined angular position said angular position indicator means (9) in relation to said member (2), then securing said angular position indicator means (9) and said crankshaft (3).   2. Method according to claim 1, characterized in that it consists in: wedging in a determined angular position said angular position indicator means (9) relative to the part (11)   of said member (2) receiving said sensor (13).   3. Method according to one of claims 1 and 2, wherein   the crankshaft (3) carries a flywheel (4), characterized in that it consists: of providing a flywheel which is angularly adjustable relative to the crankshaft (3) and capable of being secured to the latter in a set position, said means angular position indicator being fixed on said flywheel; and that it consists in: wedging in a determined angular position said flywheel (4) relative to said member (2), then   securing said flywheel (4) and said crankshaft (3).   4. Method according to one of claims 1 and 2, wherein   the crankshaft carries a flywheel, characterized in that it consists in: providing an angular position indicator means (9) angularly adjustable relative to said flywheel (3) and capable of being secured to the latter in a set position, said flywheel being fixed on said crankshaft; and that it consists in: wedging in a determined angular position 1 said indicator means (9) relative to said flywheel (4), then   securing said indicator means (9) and said flywheel (3).   5. Method according to any one of the claims   above, characterized in that it consists in: angularly wedging said crankshaft (3) relative to said engine member by means of a positioning rod (15) engaging in an orifice of this organ (2).   6. Method according to any one of the claims   above, characterized in that it consists in: angularly wedging said angular position indicator means (9) relative to said member   (2) by means of a positioning rod (20).   7. Method according to any one of the claims   above, characterized in that said angular position indicator means is a disc (9) with radial teeth (10) and that it consists in: angularly wedging said tooth wheel relative to said member by means of a positioning rod against which is brought into abutment a flank of a tooth (10a) of said disc corresponding to a   sensor signal taken into account later.   8. Method according to any one of claims   above, characterized in that said member is constituted by a casing (2) of said motor.   9. Method according to claim 6, characterized in that said positioning rod (20) of said disk is engaged in an orifice (12) of said member (2), intended for receiving and fixing said sensor (13).   10. A method of adjusting one with respect to the other of two parts belonging to a set of parts connected to each other and connected to each other by at least one part, characterized in that it consists in: wedging said parts to be adjusted (3, 9) in relation to a part   of reference (2) then to join them in the adjusted position.   11. Device for detecting the angular position of the crankshaft of an engine carrying a flywheel, characterized in that it comprises: - an angular position indicator means (9) carried by 1 said flywheel (4), a sensor (13 ) of detection of the indications of this indicating means, carried by a crankcase of the engine - and of adjustment means (7, 8) of said indicating means with respect to said crankshaft. 12. Device according to claim 11, characterized in that said adjustment means comprise fixing means   angularly adjustable of said flywheel on said crankshaft.   13. Device according to claim 12, characterized in that said adjustment means comprise fixing means   angularly adjustable from said indicator means on said flywheel.   14. Device according to any one of claims 11   13, characterized in that said adjustment means comprise means for wedging in a determined angular position of said   crankshaft with respect to said crankcase.   15. Device according to claim 14, characterized in that said wedging means comprise a positioning rod (15) engaging in an orifice (16) of said casing (2) and   likely to cooperate with a specific part of said crankshaft.   16. Device according to any one of claims 11   to 15, characterized in that said adjustment means comprise means for wedging in a determined angular position of said   indicator means with respect to said steering wheel.   17. Device according to claim 16, characterized in that said wedging means comprise a positioning rod (20) engaging in an orifice (12) of said casing (2) provided for receiving and fixing said sensor (12 ) and likely   to cooperate with part of said indicating means.   18. Device according to any one of claims 11   to 17, characterized in that said indicating means is a disc (9) with radial teeth.   19. Device according to any one of claims 11   18, characterized in that said fixing means comprise   screws (7) passing through enlarged passages.