EP3064758A1 - High pressure diesel fuel pumps and shoe arrangements - Google Patents
High pressure diesel fuel pumps and shoe arrangements Download PDFInfo
- Publication number
- EP3064758A1 EP3064758A1 EP16153707.1A EP16153707A EP3064758A1 EP 3064758 A1 EP3064758 A1 EP 3064758A1 EP 16153707 A EP16153707 A EP 16153707A EP 3064758 A1 EP3064758 A1 EP 3064758A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- shoe
- engaging surface
- pump according
- engaging
- 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
Links
- 239000002283 diesel fuel Substances 0.000 title claims abstract description 13
- 238000013016 damping Methods 0.000 claims abstract description 52
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 19
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229920003043 Cellulose fiber Polymers 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 229920001187 thermosetting polymer Polymers 0.000 claims description 2
- 239000004634 thermosetting polymer Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 239000004821 Contact adhesive Substances 0.000 description 2
- 239000003522 acrylic cement Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000717 retained 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
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0408—Pistons
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0413—Cams
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
Definitions
- the present invention relates generally to the field of high pressure diesel fuel pumps. More particularly, but not exclusively, the present invention concerns shoe arrangements for high pressure diesel fuel pumps.
- Known high pressure diesel fuel pumps comprise one or more plungers movable within plunger bores, to pressurise fuel within respective pumping chambers, for delivery to a fuel injection system of an engine.
- Each plunger is reciprocally movable along a pumping axis by a cam arrangement (driven by a drive shaft) to perform a fuel-pressurising pumping stroke and a plunger return spring to effect a plunger return stroke.
- each of the plungers may be coupled to a cylindrical tappet member which serves to drive movement of the associated plunger within its bore.
- these arrangements can be difficult to assemble, require a relatively large accommodation space and are relatively expensive.
- An alternative to the tappet arrangement comprises a roller and shoe arrangement (a cam follower or "roller-shoe” drive arrangement), in which a shoe is arranged to contact a plunger and a roller is co-operable with the shoe and the cam surface of the cam arrangement so as to impart reciprocal movement to the shoe upon rotation of the drive shaft.
- a roller and shoe arrangement a cam follower or "roller-shoe” drive arrangement
- Shoes are subjected to high forces in the pumping cycle and as such, need to be able to resist the stresses.
- Known shoe designs comprise a single component comprising a suitable metal, typically steel.
- a suitable metal typically steel.
- the roller and the cam components also need to be capable of withstanding and resisting said vibrations which may otherwise cause unacceptable wear and malfunction of the drive assembly. Accordingly, the known shoe designs and materials have a significant impact on the mechanical properties of the materials which can then be used for at least the roller, which are often high-cost materials.
- Adding materials to the shoe also increases size of the shoe. Restrictions on component size are a high priority in fuel pumps where packing spaces are crowded, which means that any increase in size is generally considered to be disadvantageous. Furthermore, an increase in size of the shoe increases the mass of the shoe, which in turn increases dynamic stresses on the driveshaft and the plunger return spring.
- a high pressure diesel fuel pump comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing and a plunger mounted along a pumping axis, the drivetrain assembly comprising a drive shaft and a cam arrangement having a cam and a cam follower mounted within a drivetrain housing, the cam follower comprising a shoe and a roller, the plunger being driven in reciprocating linear movement along the pumping axis upon rotation of the cam arrangement, wherein the shoe comprises at least one vibration damping layer disposed below a plunger-engaging surface.
- 'vibration damping layer By 'vibration damping layer' what is meant is a layer capable of damping vibration/ having energy dissipation properties under cyclic stress.
- the vibration damping layer(s) does/ do not form the plunger-engaging surface, but is(are) disposed below the plunger-engaging surface.
- the shoe comprises a body extending between the plunger-engaging surface and a roller-engaging surface.
- the roller-engaging surface forms a cavity in a lower portion of said body to receive and retain said roller.
- the damping layer(s) comprise(s) a resin.
- the resin preferably comprises a thermosetting polymer.
- the polymer comprises one or more of a phenolic resin, and epoxy resin and a polyester resin.
- the damping layer(s) comprise(s) a reinforced resin.
- the resin may be reinforced with fibres.
- the fibres may comprise one or more of cellulose fibres (such as paper or cotton), glass fibres and carbon fibres.
- the damping layer(s) comprise(s) a laminate of one or more fibre layers and one or more resin layers.
- the damping layer(s) may comprise(s) a laminate of cotton sheets and phenolic chemical resin layers, e.g. Tufnol ®.
- the damping layer(s) may comprise(s) a thickness or depth of approximately up to 50% of a depth of the shoe (as measured from said plunger-engaging surface to the roller-engaging surface).
- the damping layer(s) comprise(s) a thickness or depth of approximately from 1% to approximately 15% of a depth of the shoe (from said plunger-engaging surface to the roller-engaging surface).
- the damping layer(s) comprise(s) a thickness or depth of approximately from 1 % to approximately 10% of a depth of the shoe. Most preferably, approximately 4% of a depth of the shoe.
- the damping layer(s) is(are) disposed below a plunger-engaging layer.
- the damping layer(s) is(are) disposed between the plunger-engaging layer and the roller-engaging surface.
- the damping layer(s) is(are) disposed at least partially above the cavity.
- One or more damping layer(s) may partially surround the cavity, but most preferably, at least one damping layer is disposed above the cavity.
- the damping layer(s) is(are) preferably disposed within an upper half (plunger-engaging half) of the shoe. More preferably, the damping layer(s) is(are) disposed within an upper 25% of the shoe, most preferably within an upper 15% of the shoe.
- the damping layer(s) extends across substantially the whole of the body, e.g. between side walls of the body.
- the shoe comprises a single damping layer, although multiple separate layers may be provided disposed throughout the body.
- the plunger-engaging layer comprises load distribution characteristics.
- the plunger-engaging layer comprises a stiff material.
- the plunger-engaging layer preferably comprises a suitable metal, such as steel.
- the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 25% of the depth of the shoe (from said plunger-engaging surface to the roller-engaging surface). More preferably, the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 15% of the depth of the shoe, most preferably, approximately 5-10% of the depth of the shoe.
- the plunger-engaging layer is disposed close to the plunger-engaging surface, and most preferably forms said plunger-engaging surface.
- the plunger-engaging layer extends across substantially the whole of the body, e.g. between side walls of the body.
- the shoe body may comprise any suitable material. Therefore, the shoe body may comprise any suitable metal, such as steel.
- the damping layer(s) may, or may not be bonded to the plunger-engaging layer and/or the remaining body of the shoe.
- the damping layer(s) may be adhered to the plunger-engaging layer and/or the remaining body of the shoe using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.
- a suitable adhesive for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.
- the damping layer(s) are unbonded to the plunger-engaging layer and/or the remaining body of the shoe.
- the roller may comprise any suitable material. Therefore, the roller may comprise a suitable metal, such as steel, or a ceramic.
- an improved shoe for a cam follower of a high pressure diesel fuel pump comprising a plunger-engaging surface and a roller-engaging surface, wherein the shoe comprises at least one vibration damping layer disposed below the plunger-engaging surface.
- Figure 1 shows a high pressure diesel fuel pump (not shown) comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing (not shown) and a plunger 10 mounted along a pumping axis A-A', the drivetrain assembly comprising a drive shaft (not shown) and a cam arrangement 20 having a cam 22 and a cam follower 23 mounted within a drivetrain housing (not shown), the cam follower 23 comprising a shoe 25 and a roller 24, the plunger 10 being driven in reciprocating linear movement along the pumping axis A-A' upon rotation of the cam arrangement 20, wherein the shoe 25 comprises at least one vibration damping layer 31 disposed below a plunger-engaging surface 27.
- the shoe 25 comprises a body 26 having the plunger-engaging surface 27 and a roller-engaging surface 29.
- the vibration damping layer 31 of the shoe 25 comprises a material capable of damping vibration as the shoe 25 is subjected to cyclic stress by the plunger 10. Accordingly, the damping layer 31 comprises a suitable resin and in a preferred embodiment, comprises a resin reinforced with one or more fibre types.
- the damping layer 31 comprises a resin comprising one or more of the following: a phenolic resin, an epoxy resin or a polyester resin, reinforced with one or more of the following: cellulose fibres (e.g. paper or cotton), glass fibres or carbon fibres.
- a laminate of fibre sheets and resin layers is anticipated to provide a good option.
- sheet Tufnol ® is used, which is a laminate of cotton fibre sheets and phenolic chemical resin layers.
- the damping layer 31 comprises a thickness or depth that is relative to a depth of the shoe body 26.
- the damping layer 31 comprises a depth of approximately 1-15% of the depth of the shoe body 26.
- the damping layer 31 may comprise up to 50% of the depth of the body 26 in order to have a vibration damping effect.
- the damping layer 31 is disposed within an upper 15% of the shoe body 26 measured from the plunger-engaging surface 27.
- the damping layer 31 may be disposed at any location above, and/or around the roller-engaging surface 29 to have a vibration damping effect.
- the vibration damping layer 31 is disposed below a plunger-engaging layer 28.
- the plunger-engaging layer 28 forms the plunger-engaging surface 27 of the shoe body 26.
- the plunger-engaging layer 28 of the shoe 25 comprises a stiff material capable of imparting load distribution across the body 26. Accordingly, the plunger-engaging layer 28 comprises a suitable material and in a preferred embodiment, comprises a suitably stiff material, for example a suitable metal, such as steel.
- the plunger-engaging layer 28 comprises a thickness or depth that is relative to a depth of the shoe body 26.
- the plunger-engaging layer 28 comprises a depth of approximately 1-15% of the depth of the shoe body 26.
- the damping layer 31 may comprise up to 25% of the depth of the body 26 in order to have an acceptable load distribution effect.
- the shoe body 26 comprises a suitable metal, such steel.
- the roller-engaging surface 29 comprises a profiled surface 29a forming a cavity 30 to receive and compliment the roller 24 disposed therein.
- the plunger-engaging layer 28 and the damping layer 31 cooperate to (a) distribute the load across the body 26 of the shoe 25 and (b) dissipate vibrations within the shoe body 26. This is turn minimises the distortion of the shoe body 26 and the effects of the vibrations on the roller 24.
- the roller 24 need not be formed from a material that imparts as much resilience or ductility as has been previously required with prior art shoes.
- the roller 24 may be made from a wider range of materials since the vibration damping characteristics of the improved shoe 25 is more tolerant with otherwise harder or more brittle materials, such as ceramics.
- the resultant shoe 25 can remain small in size which is preferred in an environment with space issues.
- the construction of the shoe 25 is a sandwich of one or more damping layers 31 between body 26 layers and topped with the plunger-engaging layer 28.
- the damping layer(s) can be bonded to the plunger-engaging layer 28 and/or the remaining body 28 of the shoe 25, although it is to be appreciated that due to the tight clearance distances between a shoe 25 and a shoe guide (not shown) in the drive housing (not shown), there would be little lateral movement of the components if they were to remain unbonded. Furthermore, due to the downward action of the plunger spring (not shown), the various components would unlikely be found to dissemble in the housing.
- the damping layer(s) 31 may be adhered to the plunger-engaging layer 28 and/or the remaining body 26 of the shoe 25 using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
- The present invention relates generally to the field of high pressure diesel fuel pumps. More particularly, but not exclusively, the present invention concerns shoe arrangements for high pressure diesel fuel pumps.
- Known high pressure diesel fuel pumps comprise one or more plungers movable within plunger bores, to pressurise fuel within respective pumping chambers, for delivery to a fuel injection system of an engine. Each plunger is reciprocally movable along a pumping axis by a cam arrangement (driven by a drive shaft) to perform a fuel-pressurising pumping stroke and a plunger return spring to effect a plunger return stroke.
- In a tappet arrangement, each of the plungers may be coupled to a cylindrical tappet member which serves to drive movement of the associated plunger within its bore. However, these arrangements can be difficult to assemble, require a relatively large accommodation space and are relatively expensive.
- An alternative to the tappet arrangement comprises a roller and shoe arrangement (a cam follower or "roller-shoe" drive arrangement), in which a shoe is arranged to contact a plunger and a roller is co-operable with the shoe and the cam surface of the cam arrangement so as to impart reciprocal movement to the shoe upon rotation of the drive shaft.
- Shoes are subjected to high forces in the pumping cycle and as such, need to be able to resist the stresses.
- Known shoe designs comprise a single component comprising a suitable metal, typically steel. However, such shoe designs, whilst being able to cope with the forces, tend to transmit a high level of vibration to the roller and the cam and as a result, the roller and the cam components also need to be capable of withstanding and resisting said vibrations which may otherwise cause unacceptable wear and malfunction of the drive assembly. Accordingly, the known shoe designs and materials have a significant impact on the mechanical properties of the materials which can then be used for at least the roller, which are often high-cost materials.
- In addition, existing shoe designs demonstrate problems with uneven load distribution, which can distort a top surface of the shoe. In turn, distortion to the shoe can cause the roller to stop rotating and thus cause pump failure by fatigue of a cam-roller interface.
- One solution to address the load distribution failings of known shoe designs has been to add material to a plunger-engaging surface of the shoe to increase its stiffness. Whilst this can reduce the effects of uneven load distribution and reduce distortion, this solution does not necessarily improve the vibration issues.
- Adding materials to the shoe also increases size of the shoe. Restrictions on component size are a high priority in fuel pumps where packing spaces are crowded, which means that any increase in size is generally considered to be disadvantageous. Furthermore, an increase in size of the shoe increases the mass of the shoe, which in turn increases dynamic stresses on the driveshaft and the plunger return spring.
- It is an object of the present invention to address one or more of the problems of the prior art as discussed herein or otherwise.
- Therefore, it is now desired to provide an improved high pressure diesel fuel pump and roller-shoe/ cam follower arrangement that improves the effects of uneven load distribution and vibration on surrounding components.
- In a first aspect of the present invention there is provided a high pressure diesel fuel pump comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing and a plunger mounted along a pumping axis, the drivetrain assembly comprising a drive shaft and a cam arrangement having a cam and a cam follower mounted within a drivetrain housing, the cam follower comprising a shoe and a roller, the plunger being driven in reciprocating linear movement along the pumping axis upon rotation of the cam arrangement, wherein the shoe comprises at least one vibration damping layer disposed below a plunger-engaging surface.
- With this arrangement, the typical stiffness of a plunger-engaging surface of the shoe can be retained, whilst minimising vibration within the shoe and the roller and cam components and distributing the pumping load over a wider area. This means that not only are the restrictions on roller material choices delimited (which can be harder and more brittle due to reduced vibration), distortion of the shoe can be significantly reduced, whilst retaining a small shoe size. Further impacts of the invention include the technology becoming less reliant on high-cost materials and less demand for the current high-precision manufacturing tolerances, which could provide other manufacturing efficiency gains and savings.
- By 'vibration damping layer' what is meant is a layer capable of damping vibration/ having energy dissipation properties under cyclic stress.
- The vibration damping layer(s) does/ do not form the plunger-engaging surface, but is(are) disposed below the plunger-engaging surface.
- Preferably, the shoe comprises a body extending between the plunger-engaging surface and a roller-engaging surface. Preferably, the roller-engaging surface forms a cavity in a lower portion of said body to receive and retain said roller.
- Preferably, the damping layer(s) comprise(s) a resin. The resin preferably comprises a thermosetting polymer. Most preferably, the polymer comprises one or more of a phenolic resin, and epoxy resin and a polyester resin.
- Preferably, the damping layer(s) comprise(s) a reinforced resin. The resin may be reinforced with fibres. Preferably, the fibres may comprise one or more of cellulose fibres (such as paper or cotton), glass fibres and carbon fibres.
- Preferably, the damping layer(s) comprise(s) a laminate of one or more fibre layers and one or more resin layers. The damping layer(s) may comprise(s) a laminate of cotton sheets and phenolic chemical resin layers, e.g. Tufnol ®.
- The damping layer(s) may comprise(s) a thickness or depth of approximately up to 50% of a depth of the shoe (as measured from said plunger-engaging surface to the roller-engaging surface). Preferably, the damping layer(s) comprise(s) a thickness or depth of approximately from 1% to approximately 15% of a depth of the shoe (from said plunger-engaging surface to the roller-engaging surface). More preferably, the damping layer(s) comprise(s) a thickness or depth of approximately from 1 % to approximately 10% of a depth of the shoe. Most preferably, approximately 4% of a depth of the shoe.
- Preferably, the damping layer(s) is(are) disposed below a plunger-engaging layer. Preferably, the damping layer(s) is(are) disposed between the plunger-engaging layer and the roller-engaging surface.
- Preferably, therefore, the damping layer(s) is(are) disposed at least partially above the cavity. One or more damping layer(s) may partially surround the cavity, but most preferably, at least one damping layer is disposed above the cavity.
- The damping layer(s) is(are) preferably disposed within an upper half (plunger-engaging half) of the shoe. More preferably, the damping layer(s) is(are) disposed within an upper 25% of the shoe, most preferably within an upper 15% of the shoe.
- Preferably, the damping layer(s) extends across substantially the whole of the body, e.g. between side walls of the body.
- Preferably, the shoe comprises a single damping layer, although multiple separate layers may be provided disposed throughout the body.
- Preferably, the plunger-engaging layer comprises load distribution characteristics. Preferably, therefore, the plunger-engaging layer comprises a stiff material. The plunger-engaging layer preferably comprises a suitable metal, such as steel.
- Preferably, the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 25% of the depth of the shoe (from said plunger-engaging surface to the roller-engaging surface). More preferably, the plunger-engaging layer comprises a thickness or depth of approximately from 1% to approximately 15% of the depth of the shoe, most preferably, approximately 5-10% of the depth of the shoe.
- Preferably, the plunger-engaging layer is disposed close to the plunger-engaging surface, and most preferably forms said plunger-engaging surface.
- Preferably, the plunger-engaging layer extends across substantially the whole of the body, e.g. between side walls of the body.
- The shoe body may comprise any suitable material. Therefore, the shoe body may comprise any suitable metal, such as steel.
- The damping layer(s) may, or may not be bonded to the plunger-engaging layer and/or the remaining body of the shoe. The damping layer(s) may be adhered to the plunger-engaging layer and/or the remaining body of the shoe using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive. Preferably, the damping layer(s) are unbonded to the plunger-engaging layer and/or the remaining body of the shoe.
- The roller may comprise any suitable material. Therefore, the roller may comprise a suitable metal, such as steel, or a ceramic.
- In a second aspect of the present invention there is provided an improved shoe for a cam follower of a high pressure diesel fuel pump, the shoe comprising a plunger-engaging surface and a roller-engaging surface, wherein the shoe comprises at least one vibration damping layer disposed below the plunger-engaging surface.
- It will be appreciated that the preferred features described in relation to the first aspect of the invention apply to the second aspect of the invention.
- For a better understanding of the invention, and to show how exemplary embodiments may be carried into effect, reference will now be made to the accompanying drawings in which:
-
Figure 1 is a partial cross-sectional side view of a plunger and cam arrangement according to an exemplary embodiment of a high pressure diesel fuel pump; and -
Figure 2 is a close-up view of a portion of a shoe (as designated by 2) of a cam arrangement of a high pressure diesel fuel pump according toFigure 1 . - According to an exemplary embodiment of the invention,
Figure 1 shows a high pressure diesel fuel pump (not shown) comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing (not shown) and aplunger 10 mounted along a pumping axis A-A', the drivetrain assembly comprising a drive shaft (not shown) and acam arrangement 20 having acam 22 and acam follower 23 mounted within a drivetrain housing (not shown), thecam follower 23 comprising ashoe 25 and aroller 24, theplunger 10 being driven in reciprocating linear movement along the pumping axis A-A' upon rotation of thecam arrangement 20, wherein theshoe 25 comprises at least onevibration damping layer 31 disposed below a plunger-engagingsurface 27. - The
shoe 25 comprises abody 26 having the plunger-engagingsurface 27 and a roller-engagingsurface 29. - The
vibration damping layer 31 of theshoe 25 comprises a material capable of damping vibration as theshoe 25 is subjected to cyclic stress by theplunger 10. Accordingly, the dampinglayer 31 comprises a suitable resin and in a preferred embodiment, comprises a resin reinforced with one or more fibre types. - In an exemplary embodiment, the damping
layer 31 comprises a resin comprising one or more of the following: a phenolic resin, an epoxy resin or a polyester resin, reinforced with one or more of the following: cellulose fibres (e.g. paper or cotton), glass fibres or carbon fibres. However, a laminate of fibre sheets and resin layers is anticipated to provide a good option. In particular, sheet Tufnol ® is used, which is a laminate of cotton fibre sheets and phenolic chemical resin layers. - For optimal vibration damping qualities within the context of a
shoe 25, the dampinglayer 31 comprises a thickness or depth that is relative to a depth of theshoe body 26. In an exemplary embodiment, the dampinglayer 31 comprises a depth of approximately 1-15% of the depth of theshoe body 26. However, it is to be appreciated that the dampinglayer 31 may comprise up to 50% of the depth of thebody 26 in order to have a vibration damping effect. - For optimal performance of the
shoe 25, the dampinglayer 31 is disposed within an upper 15% of theshoe body 26 measured from the plunger-engagingsurface 27. However, it is to be appreciated that the dampinglayer 31 may be disposed at any location above, and/or around the roller-engagingsurface 29 to have a vibration damping effect. - As can be seen from both
Figures 1 and2 , thevibration damping layer 31 is disposed below a plunger-engaginglayer 28. In an exemplary embodiment, the plunger-engaginglayer 28 forms the plunger-engagingsurface 27 of theshoe body 26. - The plunger-engaging
layer 28 of theshoe 25 comprises a stiff material capable of imparting load distribution across thebody 26. Accordingly, the plunger-engaginglayer 28 comprises a suitable material and in a preferred embodiment, comprises a suitably stiff material, for example a suitable metal, such as steel. - For optimal load distribution qualities within the context of a
shoe 25, the plunger-engaginglayer 28 comprises a thickness or depth that is relative to a depth of theshoe body 26. In an exemplary embodiment, the plunger-engaginglayer 28 comprises a depth of approximately 1-15% of the depth of theshoe body 26. However, it is to be appreciated that the dampinglayer 31 may comprise up to 25% of the depth of thebody 26 in order to have an acceptable load distribution effect. - The
shoe body 26 comprises a suitable metal, such steel. - As can be seen in
Figure 1 , the roller-engagingsurface 29 comprises a profiledsurface 29a forming acavity 30 to receive and compliment theroller 24 disposed therein. - In use, as the reciprocal movement of the
plunger 10 impacts on the plunger-engagingsurface 27 of theshoe 25, the plunger-engaginglayer 28 and the dampinglayer 31 cooperate to (a) distribute the load across thebody 26 of theshoe 25 and (b) dissipate vibrations within theshoe body 26. This is turn minimises the distortion of theshoe body 26 and the effects of the vibrations on theroller 24. - With the described
shoe 25, theroller 24 need not be formed from a material that imparts as much resilience or ductility as has been previously required with prior art shoes. Theroller 24 may be made from a wider range of materials since the vibration damping characteristics of theimproved shoe 25 is more tolerant with otherwise harder or more brittle materials, such as ceramics. - Furthermore, with the described
shoe 25, an interface between theroller 24 and thecam 22 is protected since the improved load distribution characteristics minimise distortion of theshoe 25 and theroller 24. This means that thecam 22 need not be made from such hard materials. - The
resultant shoe 25 can remain small in size which is preferred in an environment with space issues. - The construction of the
shoe 25 is a sandwich of one or more dampinglayers 31 betweenbody 26 layers and topped with the plunger-engaginglayer 28. The damping layer(s) can be bonded to the plunger-engaginglayer 28 and/or the remainingbody 28 of theshoe 25, although it is to be appreciated that due to the tight clearance distances between ashoe 25 and a shoe guide (not shown) in the drive housing (not shown), there would be little lateral movement of the components if they were to remain unbonded. Furthermore, due to the downward action of the plunger spring (not shown), the various components would unlikely be found to dissemble in the housing. - Where a bonded assembly of the layers of the
shoe 25 is to be employed, the damping layer(s) 31 may be adhered to the plunger-engaginglayer 28 and/or the remainingbody 26 of theshoe 25 using a suitable adhesive, for example, an acrylic adhesive, polyurethane adhesive, an epoxy adhesive or other contact adhesive. - Although a few preferred embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications might be made without departing from the scope of the invention, as defined in the appended claims.
Claims (14)
- A high pressure diesel fuel pump comprising a pumping assembly and a drivetrain assembly, the pumping assembly comprising a pump housing and a plunger (10) mounted along a pumping axis (A-A'), the drivetrain assembly comprising a drive shaft and a cam arrangement (20) having a cam (22) and a cam follower (23) mounted within a drivetrain housing, the cam follower (23) comprising a shoe (25) and a roller (24), the plunger (10) being driven in reciprocating linear movement along the pumping axis A-A' upon rotation of the cam arrangement (20), wherein the shoe (25) comprises at least one vibration damping layer (31) disposed below a plunger-engaging surface (27).
- The pump according to claim 1, wherein the shoe (25) comprises a body (26) extending between the plunger-engaging surface (27) and a roller-engaging surface (29).
- The pump according to claim 2, wherein the roller-engaging surface (29) forms a cavity (30) in said body (26) to receive and retain said roller (24).
- The pump according to any one of claims 1-3, wherein the damping layer(s) (31) comprise(s) a resin.
- The pump according to claim 4, wherein the resin comprises a thermosetting polymer comprising one or more of a phenolic resin, an epoxy resin and a polyester resin.
- The pump according to any one of claims 4 or 5, wherein the resin is reinforced with fibres comprising one or more of cellulose fibres, glass fibres and carbon fibres.
- The pump according to claim 6, wherein the damping layer(s) (31) comprise(s) a laminate of one or more fibre layers and one or more resin layers.
- The pump according to any one of claims 1-7, wherein the damping layer(s) (31) comprise(s) a thickness or depth of approximately up to 50% of a depth of the shoe (25) (measured from said plunger-engaging surface (27) to the roller-engaging surface (29)).
- The pump according to any one of claims 2-8, wherein the damping layer(s) (31) is(are) disposed between a plunger-engaging layer (28) and the roller-engaging surface (29) above the cavity (30).
- The pump according to any one of claims 1-9, wherein the or all damping layers (31) are disposed within a plunger-engaging half of the depth of the shoe (25) (from said plunger-engaging surface (27)).
- The pump according to any one of claims 9-10, wherein the plunger-engaging layer (28) comprises load distribution a stiff material.
- The pump according to claim 11, wherein the plunger-engaging layer (28) comprises a thickness or depth from 1% to 25% of the depth of the shoe (25) (measured from said plunger-engaging surface (27) to the roller-engaging surface (29)).
- The pump according to any one of claims 9-12, wherein the plunger-engaging layer (28) forms said plunger-engaging surface (27).
- The pump according to any one of claims 9-13, wherein the damping layer(s) (31) is(are) bonded to the plunger-engaging layer (28) and/or the remaining body (26) of the shoe (25).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB201503591A GB201503591D0 (en) | 2015-03-03 | 2015-03-03 | High pressure diesel fuel pumps and shoe arrangements |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3064758A1 true EP3064758A1 (en) | 2016-09-07 |
EP3064758B1 EP3064758B1 (en) | 2018-10-10 |
Family
ID=52876441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16153707.1A Active EP3064758B1 (en) | 2015-03-03 | 2016-02-01 | High pressure diesel fuel pumps and shoe arrangements |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3064758B1 (en) |
GB (1) | GB201503591D0 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09228923A (en) * | 1996-02-26 | 1997-09-02 | Isuzu Motors Ltd | Tappet for in-line fuel injection pump |
US20090065292A1 (en) * | 2007-09-07 | 2009-03-12 | Gm Global Technology Operations, Inc. | Low Noise Fuel Injection Pump |
WO2012013452A1 (en) * | 2010-07-27 | 2012-02-02 | Robert Bosch Gmbh | High pressure pump |
-
2015
- 2015-03-03 GB GB201503591A patent/GB201503591D0/en not_active Ceased
-
2016
- 2016-02-01 EP EP16153707.1A patent/EP3064758B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09228923A (en) * | 1996-02-26 | 1997-09-02 | Isuzu Motors Ltd | Tappet for in-line fuel injection pump |
US20090065292A1 (en) * | 2007-09-07 | 2009-03-12 | Gm Global Technology Operations, Inc. | Low Noise Fuel Injection Pump |
WO2012013452A1 (en) * | 2010-07-27 | 2012-02-02 | Robert Bosch Gmbh | High pressure pump |
Also Published As
Publication number | Publication date |
---|---|
EP3064758B1 (en) | 2018-10-10 |
GB201503591D0 (en) | 2015-04-15 |
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