EP1767896B1 - Device and method for measuring the rotational position of a pump shaft - Google Patents
Device and method for measuring the rotational position of a pump shaft Download PDFInfo
- Publication number
- EP1767896B1 EP1767896B1 EP06251438A EP06251438A EP1767896B1 EP 1767896 B1 EP1767896 B1 EP 1767896B1 EP 06251438 A EP06251438 A EP 06251438A EP 06251438 A EP06251438 A EP 06251438A EP 1767896 B1 EP1767896 B1 EP 1767896B1
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- EP
- European Patent Office
- Prior art keywords
- measurement
- pump
- pump shaft
- locating
- measurement member
- 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.)
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 194
- 239000000446 fuel Substances 0.000 description 82
- 239000000523 sample Substances 0.000 description 34
- 238000005086 pumping Methods 0.000 description 24
- 238000012360 testing method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002598 diffusion tensor imaging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
- F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
- F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
- F02M41/1405—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons pistons being disposed radially with respect to rotation axis
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Description
- The present invention relates to a measurement device. More particularly, but not exclusively, the invention relates to device and method that permits the angular position of a pump shaft of a fuel injection pump to be determined accurately, and in a repeatable manner, so as to enhance the serviceability of such pumps for compression-ignition internal combustion engines. The invention also relates to a fluid pump assembly incorporating such a measurement device for determining the angular position of a pump shaft relative to a pump body.
- In a fuel injection system of a compression-ignition internal combustion engine, it is known to use a so-called 'distributor pump' to deliver pressurised fuel to a series of fuel injectors. The distributor pump serves the dual functions of i) pressurising the fuel to a desired injection pressure and ii) delivering a charge of pressurised fuel to each of the fuel injectors at the exact moment it is required to inject fuel into a corresponding combustion cylinder. In some vehicle applications, distributor pumps are favoured since they achieve a cost reduction over so-called 'in line' pumps that comprise a cam-driven pumping plunger unit for each fuel injector of the engine.
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Figure 1 shows a schematic view of a typical distributor-type fuel pump 2, the functionality of which would be well known to the skilled reader. The fuel pump 2 comprises a pump body or casing (not shown) within which a longitudinally extending pump shaft 4 is rotatably mounted. In use, the pump shaft 4 is driven by the drive shaft of an associated engine and so the speed of rotation of the pump shaft 4 is proportional to the speed of the engine. - The fuel pump 2 is functionally separated into a pump drive section, indicated generally as 6, which performs the role of fuel pressurisation, and a pump distributor section indicated generally as 8, which performs the role of distributing the pressurised fuel to each fuel injector.
- Referring firstly to the pump drive section 6 (shown to the left in
Figure 1 ), the drive shaft 4 is provided with apassage 10 extending radially therethrough within which is received a pair of diametrically opposedpumping plungers 12. Thepumping plungers 12 are moveable within theradial passage 10 and define apumping chamber 14 between their opposing faces. - The
pumping plungers 12 are operable to reciprocate within theradial passage 10 by way of acam arrangement 16 which is driven by acam ring 18. Thecam arrangement 16 includes first andsecond cam shoes 20 that engage a respective one of thepumping plungers 12 at its radially outer end. Thecam shoes 20 are shaped to receive arespective cam roller 22 in such a manner that thecam roller 22 is free to rotate in thecam shoe 20. - Although it is not clear in
Figure 1 , thecam ring 16 is of annular form and its cam surface is shaped so that as the drive shaft 4 rotates, thecam rollers 22 are caused to ride over the cam surface and move radially to impart a synchronised reciprocating motion to thepumping plungers 12. Thus, as the pump shaft 4 rotates, thepumping plungers 12 are caused to move inwardly together to perform a pumping stroke, in order to force pressurised fuel out of thepumping chamber 14, and outwardly together to perform a filling stroke, in order to suck fuel into thepumping chamber 14. - Fuel flows to and from the
pumping chamber 14 via apassage 24 provided in the pump shaft that communicates with thepump chamber 14 and extends longitudinally along the axis of the pump shaft 4 into thedistributor section 8 of the fuel pump 2. Thelongitudinal fuel passage 24 conveys fuel at an injectable pressure level away from thepumping chamber 14 to thedistribution section 8 when thepumping plungers 12 are performing a pumping stroke and conveys fuel at a relatively low pressure (transfer pressure) to thepumping chamber 14 from thedistribution section 8 when thepumping plungers 12 are performing a filling stroke. - The end of the
longitudinal fuel passage 24 located in the region of thedistributor section 8 is shaped so as to turn through 90 degrees and extend radially through the pump shaft 4 to terminate at its outer surface. - The
distributor section 8 includes a generally cylindrical distributor head 30 within which the pump shaft 4 is rotatable such that thedistributor head 30 remains stationary relative to the pump shaft 4. Thedistributor head 30 is provided with a one or more distributor ports 32 (only two of which are shown, with dashed lines, inFigure 1 ), the number of which corresponds to the number of injectors of the engine, typically four, six or eight. Thedistributor ports 32 are radially spaced around thedistributor head 30 and are communicable with thepassage 24 in the pump shaft 4 at discrete intervals as the pump shaft 4 rotates. In use, as the pump shaft 4 rotates so as to cause thepumping plungers 12 to perform a pumping stroke, thepassage 24 moves into registration with one of thedistributor ports 32. Pressurised fuel will thus be communicated to the injector that is fluidly connected to saidport 32. Thepassage 24 will register with theother distributor ports 32 in synchronisation with the pumping strokes performed by thepumping plungers 12. - The
distributor head 30 is also provided with aninlet port 34 that extends radially so as to define an opening on the outer and inner faces of thedistributor head 30. Although not shown inFigure 1 , theinlet port 34 is supplied relatively low pressure fuel from a fuel transfer pump (not shown) and is communicable with across bore 36 provided in the drive shaft 4 that intersects thelongitudinal passage 24. - As the drive shaft 4 rotates, the
inlet passage 34 registers with thecross bore 36 at discrete intervals as thepumping plungers 20 perform a filling stroke. As a result, fuel is drawn from theinlet passage 34, through thecross bore 36 andlongitudinal passage 24, and into thepumping chamber 14, ready for the commencement of a pumping stroke. - It is critical that the rotational timing of a distributor pump is set up correctly when the pump is installed on the engine for the first time to ensure that pressurised fuel is delivered to each cylinder of the engine at the correct moment. Similarly, it is important that a distributor pump can be disconnected from and re-connected to the engine, during maintenance for example, without adversely affecting the pump timing and thus performance.
- It is common for a prototype sample of a fuel pump 2 to be connected to a test engine following manufacture so that the performance of the fuel pump 2 can be analysed to determined the 'correct timing position' for that specific pump. For the purposes of the specification, the correct timing position refers to the precise angular position of the pump shaft 4 that is required to deliver fuel to the cylinder that is first in the engine firing sequence (for example, No. 1 cylinder) with the cylinder piston in the top dead centre position (TDC).
- Conventionally, a 'timing master pump' is created during development of a pump type for an engine. The purpose of the timing master pump is to calibrate a 'timing angle function' of a calibration test machine. Following the manufacture of a production-standard pump, the pump is calibrated on such a test machine or 'test bench', typically being electric-motor driven, to determine the correct timing position for accurate fuel delivery, and to determine the desired settings for other devices such as, for example, the engine speed governor and advance box. At the end of calibration the test bench rotates the drive shaft of the pump to the correct timing position referenced from the timing master pump and further angular rotation of the pump shaft 4 is prevented by a locking bolt (not shown in
Figure 1 ) that is screwed into the body of the fuel pump. Once the correct timing position has been set and the locking bolt screwed in position, the pump is suitable for delivery to an engine manufacturer. - Although the above method is adequate for setting up the correct timing position of a fuel pump prior to installation of the pump on an engine, once the fuel pump has been installed, and the lock bolt released (as required for the engine to operate), the correct timing position is lost. The Applicant has recognised that a problem exists if an engine is observed as running poorly following installation of the fuel pump as there is no means to determine whether or not the initial fuel pump timing set-up is at fault. Furthermore, if the fuel pump is removed from the engine, for maintenance purposes for example, the fuel pump cannot be correctly reinstalled since the original timing position of the drive shaft is lost. In these circumstances, the fuel pump must be returned to the manufacturer for re-calibration. This is a hindrance to the pump manufacturer and the engine manufacturer since it introduces inefficiencies, and hence cost disadvantages, into production and service procedures.
- By way of background to the invention,
US 4348895 describes a method for the angularly correct mounting of a fuel injection pump on an internal combustion engine by way of an electronic evaluation circuit to identify the required orientation of the injection pump.US 4655689 describes an electronic control system for variable displacement pumps, which uses a measurement of pump cylinder block speed to calculate an error signal that can be used to control the position of the swash plate/displacement determinative element.FR 2329970 - Thus, an object of the invention is to enable the correct timing position of a fuel pump to be measured accurately and reliably following pump calibration and which allows the pump shaft position to be checked and reset after the pump has been connected to the engine.
- It is against this background that the invention provides a method for determining the angular position of a pump shaft relative to a pump body. The method comprises: providing the pump shaft with a first locating feature; providing the pump shaft with a second locating feature; providing a measurement device provided with a measurement member, whereby the measurement device is mounted on the pump body; engaging the measurement member with the first locating feature and determining a first distance between the first locating feature and a reference feature provided on the measurement device; engaging the measurement member with the second locating feature and determining a second distance between the second locating feature and a reference feature provided on the measurement device; and determining the difference between the first and second distances to provide an indication of the angular position of the pump shaft relative to the pump body.
- A particular advantage of the invention is that it permits the correct timing position of the fuel pump to which it is mounted to be measured conveniently with a gauge prior to installing the fuel pump on an engine. Thus, a value indicative of the angular position of the pump shaft is derivable from the difference between the first and second distances. Since the measurement device determines the distance between the first and second locating features, the reading taken thereby is resilient to part-to-part variations in the fuel pump components. This provides an advantage in terms of manufacturing since the mechanical tolerances on the pump components become less critical, thus reducing manufacturing costs.
- In one mode of operation, for example in circumstances in which a reading for the correct timing position has already been obtained during an initial measurement and it is now required to re-calibrate the fuel pump following its removal from an engine, the method may include adjusting the angular position of the pump shaft so as to set the measurement member to the previously acquired reading that corresponds to the correct pump timing position. Following the re-establishment of the correct pump timing position of the pump shaft, the pump shaft may be locked against further rotation to allow for re-installation of the fuel pump on the engine.
- Preferably, the steps of engaging the measurement member with the first and second locating features, respectively, includes inserting the measurement member into openings provided in the pump body.
- The method of the invention has a particular advantage in circumstances in which the pump shaft has a predetermined correct timing position, wherein the pump shaft is locked into the correct timing position prior to engaging the measurement member with the first and second locating features, respectively. In these circumstances, the correct timing position of the pump shaft can be measured accurately and precisely following calibration of the fuel pump. This measurement may be recorded and stored against the fuel pump part number following manufacture and archived for future referral. Alternatively, or in addition, the measurement may be marked on the fuel pump to facilitate future checks on the pump timing position or to recalibrate the pump following a maintenance action.
- In one embodiment of the invention, first and second measurement members are provided such that the engagement step comprises engaging the first measurement member with the first locating feature and engaging the second measurement member with the second locating feature. Further, it is preferred that the step of engaging the first and second measurement members includes moving the measurement members towards and away from the pump body, respectively. This permits the ends of the first and second measurement members to be disengaged from the locating features in circumstances when no measurement reading is taking place in order to protect the ends of the first and second measurement members from being damaged through inadvertent angular movement of the pump shaft.
- In a second aspect, the invention provides apparatus comprising a pump having a rotatable pump shaft and measuring means for providing an indication of the angular position of the pump shaft relative to a pump body, the measuring means including means adapted to : i) measuring a first distance between a reference feature provided on the pump body and a first locating feature provided on the pump shaft, and ii) measuring a second distance between the reference feature and a second locating feature provided on the pump shaft.
- Preferably, the measuring means includes means for measuring the difference between the first and second distances to provide the indication of the angular position of the pump shaft relative to the pump body.
- For convenience, it is a preferred feature that the first and second locating features are disposed at the same axial position on the pump shaft, and diametrically opposed.
- Disposing the locating features on the pump shaft in this manner enables convenient formation of first and second bores provided in the pump body, each bore having an axis in alignment with a respective one of the first and second locating features.
- In a preferred embodiment, the measuring means includes a measuring device for receipt with the first bore so as to measure the distance between the reference feature provided on the pump body and the first locating feature provided on the pump shaft. The measuring means can also include another measuring device received within the second bore so as to measure the distance between the reference feature provided on the pump body and the second locating feature provided on the pump shaft.
- In order that the measurement device may engage with the corresponding bores of the pump body, it is preferred that the measurement device includes a positioning member provided with an external screw thread for securely engaging the corresponding bore. A screw thread is preferred to a sliding fit, for example, since it provides a more secure engagement between the measurement device and the pump body which guards against measurement errors.
- The positioning member itself may include a passage for receiving a measurement member which is moveable with respect to the positioning member such that an inner end of the measurement member may be engaged and disengaged with the first or second locating feature depending on which bore the device is engaged with.
- Preferably, the measurement member carries a locking member which, when in a locked position, prevents angular movement of the measurement member relative to the positioning member. An advantage of this feature is that the measurement member is locked in position with respect to the positioning member so that the device can be removed from the bore without affecting the measurement that has been taken.
In one embodiment, for convenient mounting of the measurement device on the pump body, it is preferred that the measurement device includes a positioning structure having first and second leg members, the first leg member slidably receiving the first measurement member and the second leg member slidably receiving the second measurement member. At their ends distal from the pump shaft the first and second leg members may be connected by a bridging member which provides torsional stiffness to the positioning structure. - It is a preferred feature of the invention that the device body is biased away from the positioning structure by biasing means to urge the first and second measurement members to disengage from the first and second locating features, respectively, in use. The biasing force may be overcome by an appropriate force applied by a user to cause the measurement members to engage the pump shaft. It is also preferred that the device body is moveable with respect to the positioning structure to permit the first and second measurement members to be engaged and disengaged with the first and second locating features, respectively. This provides a safety feature to guard against the first ends of the measurement members being damaged by the locating features due to inadvertent rotation of the pump shaft.
- Preferably, a second end of the first measurement member protrudes from the positioning structure and attaches to the device body in a fixed manner. Still preferably, the second end of the first measurement member is received within a first bore provided in the device body. In a similar manner, it is preferred that a second end of the second measurement member protrudes from the positioning structure to connect with the device body, but in a moveable manner.
- Thus, since the first measurement member is in a fixed relationship with the measurement device body, a reference distance is established to which the amount of movement of the second measurement member may be compared.
- In a preferred embodiment, the measurement gauge means is provided with a measurement gauge operable to measure the amount that the second measurement member moves linearly with respect to the device body. Although different types of measurement gauge means are compatible with the invention, for example, linear encoders and digital displacement transducers, LVDTs and the like, for simplicity and accuracy it is preferred that the measurement gauge means is a dial test indicator.
- In order that the invention may be more readily understood, reference will now be made, by way of example only, to the accompanying drawings in which:
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Figure 1 is a schematic view of a known distributor-type fuel pump for a diesel engine; -
Figure 2 is a perspective view of the housing a distributor-type fuel pump including a measurement device in accordance with an embodiment of the invention; -
Figure 3 is a perspective view of the housing of the distributor-type fuel pump inFigure 2 with the measurement device removed and closure plugs fitted; -
Figure 4 is a cross-section of the distributor-type fuel pump and measurement device ofFigure 2 ; -
Figure 5A is a perspective view of the measurement device installed in a device initialising means; -
Figure 5B is a sectional view ofFigure 5A ; -
Figures 6 and7 are part-sectional views of the housing of a fuel pump and a measurement device of an alternative embodiment of the invention; -
Figure 8 is a cross-section of the housing of a distributor-type fuel pump and measurement device of a further alternative embodiment of the invention; -
Figures 9A and 9B are side views and cross-sectional views, respectively of the measurement device ofFigure 8 ; and -
Figure 10 is a perspective view of the measurement device ofFigures 9A and 9B . - Referring to
Figures 2 ,3 and4 , there is shown in general outline of a distributor-type fuel pump 50 and an associatedmeasurement device 52 in accordance with the invention. It should be mentioned at this point that thefuel pump 50 shown in the figures is not a complete and functional fuel pump and only the parts pertinent to the invention are shown and described in the foregoing description. - The
fuel pump 50 comprises a pump body 54 a generally triangular end face 58 which, in use, enables thefuel pump 50 to be mounted to an engine. The configuration of the majority of the surface detail of thepump body 54 does not form part of the invention and so will not be described in further detail here. - Although not clearly shown in
Figures 2 or3 , thepump body 54 is provided with alongitudinal passage 60, one end of which defines a centrally disposedcircular opening 62 in theend face 58 of thepump body 54. Thelongitudinal passage 60 receives apump shaft 66 which, in use, is driven by a power take-off from the main engine crank shaft via theopening 62. - Midway along a side face of the
pump body 54, there is provided a mountingpiece 70 to which themeasurement device 52 is mounted. Theflange 70 is laterally disposed relative to the longitudinal axis of thepump body 54 and is shown in an up-right orientation inFigures 2 ,3 and4 . Theflange 70 defines first andsecond openings second bores pump body 54 and mountingpiece 70 by which means themeasurement device 52 is mounted thereto in order to enable the angular position of thepump shaft 66 to be measured. The first,upper bore 71 and the second,lower bore 73 extend from the first andsecond openings pump body 54. Each of thebores longitudinal passage 60. However, as shown inFigure 3 , in circumstances when themeasurement device 52 is removed from thepump body 54, the first andsecond openings pump body 54. - The
measurement device 52 includes a means to engage the pump body in the form of apositioning structure 80 that is provided with first and second substantiallyparallel leg members pump body 54 by anintegral bridge member 86. The first andsecond leg members second bores - Each one of the first and
second leg members drilling 87, each of which receives a respective first andsecond measurement member first probe 88 includes an inner end region 88a proximal to thepump shaft 66 that protrudes from an inner end of thefirst leg member 82 into thelongitudinal passage 60 and engages afirst locating feature 92 provided on the surface of thepump shaft 66. Thefirst probe 88 extends tangentially away from thefirst locating feature 92 along a first probe axis and includes anouter end region 88b that protrudes from thepositioning structure 80 and is connected to a block-like measurement device body in the form of agauge holder 94 in a fixed relationship. - Similarly, the
second probe 90 includes aninner end region 90a proximal to thepump shaft 66 that protrudes from an inner end of thesecond leg member 84 into thelongitudinal passage 60 and engages asecond locating feature 96 provided on the surface of thepump shaft 66. Thesecond probe 90 extends tangentially away from thesecond locating feature 92 along a second probe axis and includes anouter end region 90b that protrudes from thepositioning structure 80 and is received by thegauge holder 94 in a sliding relationship. - The
gauge holder 94 is moveable with respect to thepositioning structure 80 to permit theprobes pump shaft 66. Theouter end region 88b of thefirst probe 88 is received within afirst bore 98 provided in thegauge holder 94 and is secured thereto so as to define a fixed relationship therewith. Conversely, theouter end region 90b of thesecond probe 90 is received through asecond bore 100 defined by thegauge holder 94 and co-operates with a dialtest indicator gauge 102 in a sliding manner. Linear movement of thesecond probe 90 relative to thegauge holder 94 is therefore accurately measurable to a high resolution. For example, typically, the dial test indicator is provided with a measurement range of 20mm at a resolution of 0.01mm which enables the angular position of the shaft to be determined accurately. - The
measurement device 52 is also provided with biasing means in the form acoil spring 104 located intermediate thepositioning structure 80 and thegauge holder 94. Thespring 104 serves to bias thegauge holder 94 away from thepump body 54, thus providing a force that acts to withdraw theinner end regions 88a, 90a of theprobes respective leg members Figure 4 thegauge holder 94 is shown in a position such that thecoil spring 104 is compressed, thereby extending the first andsecond probes longitudinal passage 60 so as to engage theprobes - In this embodiment, each of the first and second locating features 92, 96 is a notch-like recess machined on the surface of the
pump shaft 66. Since the approximate angular position of thepump shaft 54 which corresponds to the correct timing position is known, the locating features 92, 96 are selectively positioned on the surface of thepump shaft 54 such that theinner end regions 88a, 90a of theprobes pump shaft 54. Thus, in this embodiment, the locating features are in the same axial position on the surface of thepump shaft 66 but diametrically opposed to one another i.e. circumferentially aligned in the same plane and radially spaced substantially by 180°. - It should be mentioned at this point that although it is not essential to the invention for the locating features 92, 96 to be diametrically opposed on the
pump shaft 54, this arrangement permits a convenient spacing of the first andsecond leg members inner end regions 88a, 90a of the first andsecond measurement members pump shaft 66, for example +/- 15 degrees of rotation around the correct timing position. - The
pump body 54 is also provided with athird bore 110 disposed intermediate the first andsecond bores pump body 54, inwardly from the face of the mountingpiece 70, so as to open into thelongitudinal passage 60. Theintermediate bore 110 receives a shaft locking device 112 in the form of a locking bolt that is provided with a projection 114 at its inner end that extends into thelongitudinal passage 60. The locking bolt 112 carries a screw thread (not shown) such that as the locking bolt 112 is screwed into thebore 110 the projection is caused to press against the outer surface of thepump shaft 66 by which means rotation of thepump shaft 66 is prevented. - In
Figure 4 , thefuel pump 50 is shown as calibrated such that the correct timing position of thepump shaft 66 has been determined, theshaft 66 being locked into that position by means of the locking bolt 112. In use, thesecond probe 90 is arranged to adopt an extended position relative to thefirst probe 88 such that, as themeasurement device 52 is operated, by way of a user urging thegauge holder 94 toward thepositioning structure 80, theinner end 90a of thesecond probe 90 will engage thesecond locating feature 96 before the inner end 88a of thefirst probe 88 engages thefirst locating feature 92. As thegauge holder 94 is depressed, thesecond probe 90 will be caused to move linearly through thegauge 102 until the inner end 88a of thefirst probe 88 engages thefirst locating feature 92. Since thefirst probe 88 is not permitted to slide with respect to thegauge holder 94, the length of thefirst probe 88 defines a distance to which the amount of sliding movement of thesecond probe 90 may be referenced. Thus, the distance between the first and the second locating features 92, 96 is measured and, as a result, the exact angular position of thepump shaft 66 that corresponds to the correct timing position may be determined. - It is preferred that the
second probe 90 is arranged initially to adopt an extended position relative to that of thefirst probe 88 so that the readings taken from thegauge 102 are positive values as opposed to negative values, thus guarding against possible ambiguity when a user operates the device. To this end, and as shown inFigures 5A and 5B , a device initialising means in the form of asetting block 150 is provided. In this embodiment, thesetting block 150 is generally cuboidal in form and defines anoblong mounting face 152. Thesetting block 150 is provided with first and second parallel bores 154, 156, that extend fromrespective openings face 152. Other ends of thebores setting block 150 but are closed off by acover plate 157 that is fastened to thesetting block 150 by rivets or screws. The first andsecond bores second legs positioning structure 80, thus permitting themeasurement device 52 to be mounted to thesetting block 150. - The first bore 154 (shown in an uppermost position in
Figure 5B ) of thesetting block 150 is provided with aspacer piece 162 at its blind end which is attached to thecover plate 157 by ascrew 164 so as to hold thespacer piece 162 in position. The spacer piece is configured to have a predetermined thickness, for example 10mm, such that the available depth of thefirst bore 154 is less than the available depth of thesecond bore 156. - As shown in
Figure 5B , themeasurement device 52 is mounted to thesetting block 150 and thegauge holder 94 operated to engage the inner ends 88a, 90a of themeasurement members gauge 102 is reset, or 'zeroed' by unlocking aclamp screw 165 so as to enable rotation of the dial face to establish a datum position. - As has been mentioned, in order for the
inner ends 88a, 90a of the measurement members to remain engaged with the first and second locating features 92, 96, respectively, thepump shaft 66 may only move through a limited range of rotation, approximately +/- 15 degrees, about the correct timing position. Providing thesetting piece 162 enables themeasurement device 52 to be calibrated to a predetermined datum such that positive values are provided by thegauge 102 throughout the full range of movement of thepump shaft 66. - One benefit provided by the invention is that, following calibration of the
fuel pump 50, the reading from thegauge 102 may be recorded against the manufacturing part number of thefuel pump 50 and archived so as to be available for subsequent referral. Thus, each fuel pump that is manufactured will have a reading associated therewith indicating its correct timing position. In addition to the "archived value" of the correct timing position used by the fuel pump manufacturer, the value may also be marked on the outer surface of the fuel pump, for example etched onto the pump casing or printed on a data plate. The details of the correct timing position are therefore available for the purposes of verifying the correct timing position when the pump is installed on an engine by a vehicle manufacturer, or when re-setting the timing position when the fuel pump is removed from the engine during a maintenance event. - A particular advantage of the invention is that since the difference between the first and second distances (defined by the first and second measurement members, respectively) is measured, the value provided by the
gauge 102 is substantially unaffected by lateral play of thepump shaft 66 due to the bearings of the shaft. Similarly, themeasurement device 52 is insensitive to vertical 'float' in the bearings. - Further, since the
measurement device 52 determines the distance of thesecond locating feature 96 relative to thefirst locating feature 92, any part-to-part variations in the components of the pump are included in the measurement reading. Thus, although themeasurement device 52 must be manufactured accurately, less tight tolerances are permissible for the pump components, thus reducing unit costs. Themeasurement device 52 is also compatible with existing fuel pump designs, such designs requiring only relatively minor structural modifications to allow themeasurement device 52 to mount onto the pump (for example, the provision of thebores - If the
fuel pump 50 has to be removed from thepump shaft 66 for maintenance purposes, then in order to re-set the correct timing position, thepump shaft 66 is first rotated into approximately the desired position. Themeasurement device 52 is then mounted to thefuel pump 50 and operated by a user until the first andsecond probes pump shaft 66 is rotated until the gauge reading corresponds with the archived value. When the correct timing position of thepump shaft 66 is obtained, thepump shaft 66 must be locked to prevent further rotation prior to the fuel pump being re-installed on the engine. - In this alternative mode of operation, the invention provides a convenient and cost efficient way for an engine manufacturer, for example, to re-calibrate the
fuel pump 50 into its predetermined correct timing position. In known fuel pumps, it would be necessary to return the fuel pump to the pump manufacturer to carry out the re-calibration process. - In general, many variations are possible within the inventive concept. For example, although the above described embodiment includes a
measurement device 52 having first andsecond measurement members - Therefore, the invention provides an alternative embodiment shown in
Figures 6 and7 , in which ameasurement device 200 includes ameasurement device body 201 having asingle leg member 202 being engageable with thefirst bore 71 or thesecond bore 73 of thefuel pump 50. It should be appreciated that thefuel pump 50 shown inFigures 6 and7 is identical to that which has been described with respect to the previous embodiment and so will not be described again here. - The measurement device includes a
measurement gauge 204 connected to theleg member 202, thegauge 204 having asingle measurement member 206 associated therewith, aninner end 206a of which is co-operable with either the first or second locating features 92, 96 when appropriately mounted to thepump body 54. - In this embodiment, in order to obtain an accurate measurement of the angular position of the
pump shaft 66, it is necessary to perform a two-part operation in which theleg member 202 of themeasurement device 200 is inserted into each of thebores pump body 54 in turn. - Prior to the
measurement device 200 being mounted to thefuel pump 50, themeasurement member 206 adopts a fully extended position, at which position thegauge 204 is zeroed, by way of theclamp screw 208, thus defining a datum position. It would be appreciated by the skilled reader that the measurement probe of a conventional dial test indicator adopts a fully extended position with respect to the gauge body and measures the linear distance that the end of the probe is moved towards the gauge. - In
Figure 6 , thepump shaft 66 is shown in the region of its correct timing position and theinner end 206a of themeasurement member 206 is engaged with thesecond locating feature 96. Thus, themeasurement member 206 is shown shifted from its datum position by a first distance along the axis defined by themeasurement member 206. The first distance is measured by the gauge to a high accuracy (the typical resolution of a dial test indicator is 0.01mm) and the reading is recorded by the user as a reference value. -
Figure 7 shows the second operation in which themeasurement device 200 is removed from the second,lower bore 71 and engaged with the first,upper bore 73. Themeasurement member 206 is thus moved from its datum position by a second distance along the axis defined by themeasurement member 206. The second distance is measured by thegauge 204 and the reading is recorded by the user. In order to determine an accurate value for the angular position of thepump shaft 66, the first, reference value is subtracted from the second value, which provides the distance between the first and second locating features 92, 96 measured along parallel axes defined by themeasurement member 206. It will be appreciated that in some circumstances the above arithmetic step may result in a negative value which is undesirable to avoid possible ambiguity to the operator of the measurement device. To avoid this, a predetermined nominal value (for example 10mm) is added to the aforementioned arithmetic operation so as to ensure the resulting value is positive. - It will be appreciated that it would be also possible to obtain an indication of the angular position of the
pump shaft 66 merely using a single measurement operation of themeasurement device 200. However, the value obtained by a single reading is inaccurate since the reading displayed by thegauge 204 is susceptible to play in the bearings in which thepump shaft 66 is mounted. Moreover, a 'double sided reading', i.e. measuring the difference in position between the first and second locating features 92, 96, is substantially twice as sensitive as a 'single sided reading' since as thepump shaft 66 rotates, the first and second locating features 92, 96 move in opposite directions by the same amount. - In the above embodiments, the first and second locating features 92, 96 are described as notches or recesses provided on the surface of the
pump shaft 66 that are circumferentially aligned in the same plane and diametrically opposed i.e. radially spaced by substantially 180°. However, this need not be the case and the locating features 92, 96 may, for example, be diametrically opposed but spaced apart at different axial positions on the surface of the shaft. Alternatively, the locating features need not be diametrically opposed but may be spaced apart radially by less than 180°. The important factor is that the locating features 92, 96 are positioned so as to be generally aligned with the inner openings of the upper andlower bores pump shaft 66 is within a predetermined rotational range of the correct timing position. - Also, although in
Figures 4 ,5A, 5B , thesecond measurement member 90 and inFigures 6 and7 themeasurement member 206 are illustrated as a unitary rod-like member, themeasurement members measurement member - Although in the embodiment of
Figures 2 to 5 it is a feature that thefirst measurement member 88 is immovably fixed to thegauge holder 94 and thesecond measurement member 90 is moveable with respect to thegauge holder 94, it should be appreciated that this need not be the case. In an alternative embodiment (not shown), for example, thefirst measurement member 88 is moveable with respect to thegauge holder 94 and thesecond measurement member 90 is carried in a fixed relationship thereto. - A still further variation on the inventive concept is illustrated in
Figures 8 ,9A ,9B and10 which utilises a single measurement member. Thefuel pump 50 in this embodiment is identical to that which has been described with respect to the previous embodiments and so will not be described again in detail here. Where appropriate, however, like parts are denoted by like reference numerals. This embodiment provides a simplified measuring apparatus which is particularly suited for use in the field where sensitive measurement gauges, such as DTIs, may be vulnerable to shock damage. Moreover, standard mechanical or digital vernier callipers may be used with this particular embodiment which reduces the costs of supplying such a unit. -
Figure 8 shows alternative means for measuring the angular position of thepump shaft 66 that provides first and secondidentical measurement devices 300. An upper one of the measuring devices 300a is received in theupper bore 71 of thepump body 54 and a lower one of the measuringdevices 300b is received in thelower bore 73. - Referring also to
Figures 9A, 9B and10 , which show the measuringdevice 300 more clearly, it can be seen that the measuringdevice 300 includes a centrally disposed bolt-like positioning member 302 having a through-bore 304 through which anelongate measurement member 306 extends. Inner andouter ends measurement member 306 protrude out of either end of the positioning member 302 (shown to the right and left ofFigures 9A and 9B , respectively). As in previously described embodiments, themeasurement member 306 is in the form of a slim rod-like probe. - A
shank 308 of thepositioning member 302 is provided with an external screw thread (not shown) that is engageable with an internal screw thread (also not shown) provided in thebores pump body 54. Ahead region 310 of thepositioning member 302 has a larger diameter than theshank 308 and provides a gripping surface for a user to tighten thepositioning member 302 in thebores shank 308 and internal surface of thebores - The
bore 304 of thepositioning member 302 is provided with aninternal screw thread 312 along approximately two-thirds of its length which cooperates with an externally threadedregion 314 provided on amiddle portion 311 of themeasurement member 306. Therefore, rotation of themeasurement member 306 relative to thepositioning member 302 is converted to linear movement such that theinner end 306a of themeasurement member 306 moves axially inward or outward depending on the direction of rotation. - The
outer end 306b of themeasurement member 306, distal from thepump shaft 66, carries a fixedannular collar 316 which provides a convenient gripping point for a user to rotate themeasurement member 306. Themeasurement member 306 also carries alocking ring 318, located between theannular collar 316 and thepositioning member 302, which is co-operable with the threadedmiddle portion 311 of themeasurement member 306. As is shown inFigures 8 to 10 , thelocking ring 318 is screwed up to abut thepositioning member 302 to prevent further rotation of themeasurement member 306. Themeasurement member 306 is thus in a fixed axial position. - In order to determine the angular position of the
pump shaft 66, ameasurement device 300 is inserted into each of the upper andlower bores pump body 54 and thepositioning member 302 is screwed into finger-tight engagement. Although not shown inFigure 8 , initially thelocking ring 318 is screwed out fully such that it abuts theannular collar 316. - Following insertion of the
measurement devices 300 into the upper andlower bores measurement member 306 is rotated relative to thepositioning member 302 until theinner end 306a engages itsrespective locating feature measurement member 306, thelocking ring 318 is screwed down to abut thepositioning member 302. This is the position shown inFigure 8 . - When the
locking ring 318 is in abutment with the positioningmember 302, a gap exists between the opposing faces of theannular collar 316 and thelocking ring 318. OnFigure 8 , the gap on the upper measuring device 300a is labelled as D1 and the gap on thelower measuring device 300b is labelled as D2. The size of each gap D1, D2 is measured by a pair of vernier callipers to provide an upper reading R1 and a lower reading R2. Of course, although mechanical or digital vernier callipers are particularly suited to measuring the gaps D1, D2, this does not preclude other gauges from being used for the same purpose. However, in order to provide the necessary accuracy, it is preferred that any such gauge should have a resolution of 0.01mm. - In order to determine an accurate value for the angular position of the
pump shaft 66, the upper reading R1 is subtracted from the lower reading R2, which provides the distance between the first and second locating features 92, 96 measured along parallel axes defined by themeasurement members 306. It will be appreciated that in some circumstances the above arithmetic step may result in a negative value which is undesirable to avoid possible ambiguity to the operator of the measurement device. To avoid this, a predetermined nominal value (for example 10mm) is added to the aforementioned arithmetic operation so as to ensure the resulting value is positive. - Although two
measurement devices 300 are used in the above procedure, it should be appreciated that it is also possible to perform the same measurement with a single measurement device which is engaged first in theupper bore 71, and a reading R1 taken, and then in thelower bore 73, and a reading R2 taken. The calculation described above is then carried out to deduce the angular position of the pump shaft.
Claims (27)
- A method for determining the angular position of a pump shaft (66) relative to a pump body (54), the method comprising:providing the pump shaft (66) with a first locating feature (92),providing the pump shaft (66) with a second locating feature (96),providing a measurement device (94; 201; 300) provided with a measurement member (88, 90; 206; 306), whereby the measurement device (94; 201; 300) is mounted on the pump body (54),engaging the measurement member (88, 90; 206; 306) with the first locating feature (92) and determining a first distance between the first locating feature (92) and a reference feature provided on the measurement device (94; 201; 300),engaging the measurement member (88, 90; 206; 306) with the second locating feature (96) and determining a second distance between the second locating feature (96) and a reference feature provided on the measurement device (94; 201; 300),determining the difference between the first and second distances to provide an indication of the angular position of the pump shaft (66) relative to the pump body (54).
- The method of claim 1, wherein the pump shaft (66) has a predetermined correct timing position and wherein the pump shaft (66) is locked into the correct timing position prior to engaging the measurement member (88, 90; 200; 306) with the first and second locating features (92, 96), respectively.
- The method of claim 1, wherein following the steps of engaging the measurement member (88, 90; 206; 306) with the first and second locating features (92, 96), respectively, the angular position of the pump shaft (66) is adjusted so as to move the pump shaft (66) to a position corresponding to a predetermined correct timing position.
- The method of claim 3. wherein the pump shaft (66) is locked against further rotation following the step of adjusting the pump shaft (66) to the predetermined correct timing position.
- The method of any of claims 1 to 4, wherein the step of engaging the measurement member (88. 90: 206; 306) with the first and second locating features (92, 96), respectively, includes inserting the measurement member (88, 90, 206; 306) into first and second openings (72. 74) provided in the pump body (54).
- The method of any of claims 1 to 4, wherein the measurement device (94) is provided with first and second measurement members (88, 90) and wherein the engagement step comprises engaging the first measurement member (88) with the first locating feature (92) and engaging the second measurement member (90) with the second locating feature (96).
- The method of claim 6, wherein the step of engaging the first and second measurement members (88, 90) includes moving the device body (94) with respect to the pump body (54).
- Apparatus comprising a pump (50) having a rotatable pump shaft (66) and measuring means (94, 201, 300) for providing an indication of the angular position of the pump shaft (66) relative to a pump body (54), the measuring means (94, 201, 300) including means adapted to i) measure a first distance between a reference feature provided on the pump body (54, and a first locating feature (92) provided on the pump shaft (66), and ii) measure a second distance between the reference feature and a second locating feature (96) provided on the pump shaft (66).
- The apparatus of claim 8, wherein the measuring means includes means (102) for measuring the difference between the first and second distances to provide the indication of the angular position of the pump shaft (66) relative to the pump body (54).
- The apparatus of claim 8 or claim 9, wherein the first and second locating features (92, 96) are disposed at the same axial position on the pump shaft (66).
- The apparatus of any of claims 8 to 10, wherein the first and second locating features (96) are diametrically opposed on the pump shaft (66).
- The apparatus of any of claims 8 to 11, wherein the pump body (54) is provided with first and second bores (71, 73), each bore having an axis in alignment with a respective one of the first and second locating features (92, 96).
- The apparatus of claim 12, wherein the measuring means includes a measuring device (300) for receipt within the first bore (71) so as to measure the distance between the reference feature provided on the pump body (54) and the first locating feature (92) provided on the pump shaft (66).
- The apparatus of claim 12, wherein the measurement means includes a measuring device (300) for receipt within the second bore (73) so as to measure the distance between the reference feature provided on the pump body (54) and the second locating feature (96) provided on the pump shaft (66).
- The apparatus of claim 12, wherein the measurement means includes first and second measurement devices (300a, 300b), each of which is engageable with a corresponding one of the first and second bores (71, 73) provided in the pump body (54) so as to measure, respectively, the distance between the reference feature provided on the pump body (54) and the first and second locating features (92, 96) provided on the pump shaft (66).
- The apparatus of any of claims 13 to 15, wherein the or each measurement device (300, 300a, 300b) includes a measurement member (306) associated therewith, the measurement member (306) having a first end (306a) co-operable with the first or second locating features (92, 96).
- The apparatus of any of claims 13 to 16, wherein the or each measurement device (300, 300a, 300b) includes a positioning member (302) provided with an external screw thread for securely engaging the corresponding bore (71, 73) of the pump body (54).
- The apparatus of claim 17, wherein the positioning member (302) includes a passage (304) for receiving a measurement member (306), the measurement member (306) being moveable relative to the positioning member (302).
- The apparatus of claim 18, wherein the measurement member (306) carries a locking member (318) which, when in a locked position, prevents angular movement of the measurement member (306) relative to the positioning member (302).
- The apparatus of claim 12, wherein the measurement means includes a measurement device (52) having first and second measurement members (88, 90) associated therewith, wherein the first measurement member (88) has a first end (88a) co-operable with the first locating feature (92) and the second measurement member (90) has a first end (90a) co-operable with the second locating feature (96).
- The apparatus of claim 12, wherein the measuring means includes a positioning structure (80) provided with first and second leg members (82, 84), the first leg member (82) being received within the first bore (71) and slidably receiving the first measurement member (88) and the second leg member (84) being received within the second bore (73) and slidably receiving the second measurement member (90).
- The apparatus of claim 21, wherein a second end (88b) of the first measurement member (88) protrudes from the positioning structure (80) and attaches to a measuring device body (94) in a fixed manner.
- The apparatus of claim 22, wherein a second end (90b) of the second measurement member (90) protrudes from the positioning structure (80) to connect with the device body (94) in a moveable manner.
- The apparatus of claim 22 or claim 23, wherein the device body (94) is moveable with respect to the positioning structure (80) to permit the first and second measurement members (88, 90) to be engaged and disengaged with the first and second locating features (92, 96), respectively.
- The apparatus of claim 24, wherein the device body (94) is biased away from the positioning structure (80) so as to urge the first and second measurement members (88, 90) to disengages from the first and second locating features (92, 96), respectively.
- The apparatus of any of claims 20 to 25, wherein the device body (94) includes a measurement gauge (102) operable to measure the amount that the second measurement member moves linearly with respect to the device body (94).
- The apparatus according to claim 26, wherein the measurement gauge (102) is referenced to the first distances.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06251438A EP1767896B1 (en) | 2005-09-21 | 2006-03-17 | Device and method for measuring the rotational position of a pump shaft |
US11/501,384 US7832990B2 (en) | 2005-09-21 | 2006-08-09 | Measurement device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05255850 | 2005-09-21 | ||
EP06251438A EP1767896B1 (en) | 2005-09-21 | 2006-03-17 | Device and method for measuring the rotational position of a pump shaft |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1767896A1 EP1767896A1 (en) | 2007-03-28 |
EP1767896B1 true EP1767896B1 (en) | 2009-11-04 |
Family
ID=35735040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06251438A Active EP1767896B1 (en) | 2005-09-21 | 2006-03-17 | Device and method for measuring the rotational position of a pump shaft |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1767896B1 (en) |
AT (1) | ATE447698T1 (en) |
DE (1) | DE602006010150D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113701608A (en) * | 2021-07-29 | 2021-11-26 | 东风汽车零部件(集团)有限公司刃量具分公司 | Gear timing angle checking fixture |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2329970A1 (en) * | 1975-11-03 | 1977-05-27 | Sibe | Dial gauge for measuring angles - has fixed and moving probes to locate position of butterfly valve of carburettor |
DE2949018A1 (en) * | 1979-12-06 | 1981-06-11 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD FOR ANGLED RIGHT ATTACHMENT OF A FUEL INJECTION PUMP TO AN INTERNAL COMBUSTION ENGINE |
US4655689A (en) * | 1985-09-20 | 1987-04-07 | General Signal Corporation | Electronic control system for a variable displacement pump |
-
2006
- 2006-03-17 AT AT06251438T patent/ATE447698T1/en not_active IP Right Cessation
- 2006-03-17 EP EP06251438A patent/EP1767896B1/en active Active
- 2006-03-17 DE DE602006010150T patent/DE602006010150D1/en active Active
Also Published As
Publication number | Publication date |
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ATE447698T1 (en) | 2009-11-15 |
DE602006010150D1 (en) | 2009-12-17 |
EP1767896A1 (en) | 2007-03-28 |
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