EP3153702B1 - Pumping assembly - Google Patents
Pumping assembly Download PDFInfo
- Publication number
- EP3153702B1 EP3153702B1 EP16191554.1A EP16191554A EP3153702B1 EP 3153702 B1 EP3153702 B1 EP 3153702B1 EP 16191554 A EP16191554 A EP 16191554A EP 3153702 B1 EP3153702 B1 EP 3153702B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plunger
- shoe
- pumping assembly
- spring
- respect
- 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.)
- Active
Links
- 238000005086 pumping Methods 0.000 title claims description 39
- 230000033001 locomotion Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
-
- 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
-
- 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
- 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
-
- 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
- F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam
-
- 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
- F04B1/0439—Supporting or guiding means for the 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
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
Definitions
- the present invention relates to a pumping assembly for a pump, and specifically to a pumping assembly for a high pressure diesel fuel pump.
- a currently known pumping assembly 2 is illustrated in Figure 1 , and comprises a pumping element in the form of a plunger 4, and a plunger return spring 6 located in a spring chamber 8. Rotation of a cam lobe 80 of a driveshaft assembly causes force to be transferred to the plunger 4 via a roller 14 and a shoe 12, thereby causing the plunger 4 to move in a reciprocating motion, thereby to pressurise fuel within a control chamber.
- the components which transfer rotational movement of the cam lobe 80 to the plunger 4 must be in contact with each other at all times.
- the spring 6 maintains contact between the roller 14 and the cam lobe 80 by acting through a spring seat 10, which is rigidly mounted on the plunger 4.
- the spring force must be sufficiently high to maintain constant contact between the roller 14 and the cam lobe 80.
- a secondary function of the spring seat 10 is to act as a guide for a lower end of the spring 6, maintaining it concentrically with the upper end of the spring 6.
- a disadvantage of this prior art embodiment is that in addition to axial forces, the spring 6 may apply a side load, i.e. radial force, to the plunger 4, via contact between the spring seat 10 and the plunger 4. Radial forces applied to the plunger 4 can cause wear, and possibly eventual seizure, of the plunger 4.
- EP1519033 A2 describes another pumping assembly according to the state of the art.
- the present invention provides, in a first aspect, a pumping assembly according to claim 1.
- the pumping assembly comprises a first member and a second member, wherein the spring seat is provided on the first member, and wherein the second member is fixedly attached to the plunger.
- the second member is clipped into a groove provided in the plunger, and wherein arms of second member are located and free to move within longitudinally extending apertures provided in the first member.
- the first member may comprise a radial section which extends radially with respect to the pumping axis A; wherein the radial section is located between the second member and the housing part; and wherein the spring seat is provided by a surface of the radial section.
- the first member may further comprise an axial section which extends axially with respect to the pumping axis from a junction with the radial section, and wherein a surface of the axial section constrains the end of the spring in a radial direction.
- the pumping assembly may further comprise first member location means, for locating the first member with respect to the plunger.
- the first member location means may comprise walls or surfaces of a groove recess or a spigot provided on the shoe.
- the walls or surfaces of the groove recess or spigot may comprise walls or surfaces which are orthogonal to an upper surface of the shoe.
- the first member location means may comprise an annular groove recess provided in a top face of the shoe, remote from the roller, wherein the groove recess comprises tapered faces which act to centre the first member with respect to the plunger.
- the first member location means comprises a counter feature provided in a top face of the shoe, the counter feature comprising a tapered wall which acts to centre the first member with respect to the plunger.
- the first member location means comprises a raised spigot provided on a top face of the shoe, wherein an outer face of the spigot acts to centre the first member with respect to the plunger.
- a pumping assembly 102 according to a first embodiment of the present invention is illustrated in Figure 2 , and detailed views are provided in Figures 3 and 4 .
- the pumping assembly 102 comprises a pumping element in the form of a plunger 104, and a spring 106 located in a spring chamber 108.
- the plunger 104 is located such that a first, upper end 150 thereof is located within a housing part 190, and a second, lower end 152 is located proximate a shoe 112.
- Rotation of a cam lobe 180 of a driveshaft assembly causes force to be transmitted to the plunger 104, via a roller 114 and a shoe 112.
- the transferred force causes the plunger 104 to move in a reciprocating motion along a pumping axis A.
- the shoe 112 is located within a void 160 of a shoe guide 116.
- a seat guide, or first member 120, and a plunger return clip, or second member 140, are located around, and towards the second, lower end 152 of the plunger 104.
- the first and second members 120, 140 can be formed from sheet metal.
- the first member 120 can be formed by deep drawing, with piercings to form side apertures (described below) and a lower opening.
- the second member 140 can be a fine blanked component.
- the first member 120 comprises a first, upper part 122 and a second, lower part 136.
- the first, upper part 122 is located in the spring chamber 108
- the second, lower part 136 is located at least partially within the void 160 of the shoe guide 116.
- the first part 122 of the first member 120 comprises an axial section 124 and a radial section 126.
- the axial section 124 is remote from the shoe 112 and extends axially with respect to the plunging axis A.
- the radial section 126 is closer to the shoe 112 than the axial section 124, and extends radially between a junction 128 with the axial section, and a junction 128 with the second part 136.
- An upper surface 130 of the radial section 126 acts as a spring seat for the spring 106.
- An end 118 of the spring 106 remote from the housing part 190, abuts the upper surface 130 of the radial section 126; the end 118 of the spring 106 is therefore constrained in an axial direction by the radial section 126.
- the radial section 126, and therefore the upper surface 130 are of a radial width greater than that the coils of the spring 106, thereby providing a full spring seat.
- An inner surface 132 of the axial section 124 constrains, in a radial direction, an outer diameter of the spring 106 towards the lower end 118.
- the second, lower part 136 of the first member 120 comprises an axial member which extends in the direction of the pumping axis A, from the junction 134 with the first, upper part 122.
- a second member location means to fixedly attach the second member 140 to the plunger 104.
- the locating means comprises a radial groove 162, into which the second member 140 is clipped. Accordingly, during operation of the pumping assembly 102, the plunger 104 and the second member 140 move together.
- a first member location means is also provided, for locating the first member 120.
- the first member location means comprises an annular groove recess 166 provided in a top face 164 of the shoe 112, remote from the roller 114.
- the groove recess 166 can be added at a milling stage of production of the shoe 112.
- the groove recess 166 has a 'V' form, comprising tapered surfaces 170, 172, and a flat lower face 168 at the bottom of the V between the tapered surfaces 170, 172.
- a lower end face 138 of the second, lower part 136 of the first member 120 abuts against the lower face 168 of the groove recess 166.
- the tapered sides 170, 172 of the groove recess 166 act to centre the first member 120 with respect to the plunger 104 during assembly.
- the design of the groove recess 166 is such that it has minimal effect on the structural and functional integrity of the shoe 112.
- Figures 5 and 6 illustrate the first member 120 and the second member 140. As illustrated in Figure 5 , a clearance 174 is provided between a main outer diameter 154 of the second member 140, and an inner diameter 156 of the first member 120.
- the second member 140 is provided with three arms 142, each of which are located within a corresponding aperture 138 (two of which are indicated on Figure 6 ), provided in the second, lower part 136 of the first member 120.
- the apertures 138 of the first member 120 extend longitudinally with respect to the pumping axis A, and each have a closed, upper end 146 proximate to the first part 122, and an open, lower end 144 remote from the first part 122.
- a circumferential clearance 176 is provided between each of the arms and a side wall 148 of the apertures 138.
- a minimum, axial clearance 178 is also present between a top surface 158 of each arm 142 and the upper, closed end 146 of the 138 aperture in which it is located.
- the clearances 174, 176, 178 allow the second member 140 and the plunger 104, on a filling stroke, to separate from the shoe 112 and float on the arms 142 within the apertures 138.
- the 'C' clip design of the second member 140 utilises the elasticity of the material such that it is in an interference fit in the plunger annular groove 162 on assembly only; when installed it is in a clearance fit, partly to reduce stresses, and partly to prevent transmission of torque between the first member 120 and the plunger 104 via the second member 140.
- the first member location means is provided by the annular groove recess 166.
- Alternative embodiments can comprise alternative first member location means as discussed below.
- FIG. 8 A second, alternative embodiment of shoe for use in the present invention is illustrated in Figure 8 .
- the alternative shoe 212 which is assembled into a pumping assembly in the same manner as the first embodiment, has a tapered body, i.e. the walls 292 taper towards the top surface 264 of the shoe 212, to assist assembly. Additional material may be added to the top of the shoe 212 to ensure structural integrity.
- the alternative shoe 212 has a counter feature comprising a flat countersunk face 294 and a tapered wall 296.
- the first member 140 is located within the counter feature 294, the tapered wall 296 acting as a first member location means, and also acts to centre the first member 120 with respect to the plunger 104, in the same manner as the groove recess of the first embodiment.
- a third embodiment of shoe for use in the present invention is illustrated in Figure 9 .
- the third embodiment of shoe 312 which is assembled into a pumping assembly in the same manner as the first and second embodiments, also has a tapered body, with walls 392 tapering towards the top surface 364 of the shoe 312 to assist assembly. Additional material again may be added to the top of the shoe 312 to ensure structural integrity.
- the further alternative shoe 312 is provided with a raised spigot 384.
- the first member 120 locates around the raised spigot 384.
- An outer, tapered face 398 of the spigot 384 acts as a first member location means, and also acts to centre the first member 120 with respect to the plunger 104.
- the first member location means may comprise a recess or a spigot having surfaces which are orthogonal to the upper surface of the shoe, rather than being tapered.
- the surfaces 170 and 172 of the groove recess 166 could comprise a surface which is orthogonal to the upper surface 164 of the shoe 112.
- the tapered wall 296 of the counter feature of the second embodiment of shoe 212 could be orthogonal to the upper surface 264 of the shoe 212
- the outer face 398 of the spigot 384 of the third embodiment could be orthogonal to the upper surface 364 of the shoe 312.
- the spring seat is located on top of the shoe, and is not in contact with the plunger, and therefore the prior art problem of wear and tear of the plunger caused by contact with the spring seat is avoided.
- the first member location means acts to centre the first member 120 with respect to the plunger 104, therefore, contact between the plunger 104 and the first member 120 is not necessary to maintain the first member 120 concentrically.
- the present invention is also considerably more cost effective to produce than prior art embodiments.
- a further advantage of the present invention is that a longer head turret can be fitted into a pump than could be for a pump including certain prior art spring seats, as the spring is guided on its outside diameter, thereby freeing up space on the inside of the spring. Additionally, apertures which are necessary for circulation of fuel and lubrication of contact faces are much easier to manufacture in the present invention.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
- Fuel-Injection Apparatus (AREA)
Description
- The present invention relates to a pumping assembly for a pump, and specifically to a pumping assembly for a high pressure diesel fuel pump.
- A currently known
pumping assembly 2 is illustrated inFigure 1 , and comprises a pumping element in the form of aplunger 4, and aplunger return spring 6 located in aspring chamber 8. Rotation of acam lobe 80 of a driveshaft assembly causes force to be transferred to theplunger 4 via aroller 14 and ashoe 12, thereby causing theplunger 4 to move in a reciprocating motion, thereby to pressurise fuel within a control chamber. - The components which transfer rotational movement of the
cam lobe 80 to theplunger 4 must be in contact with each other at all times. Thespring 6 maintains contact between theroller 14 and thecam lobe 80 by acting through aspring seat 10, which is rigidly mounted on theplunger 4. The spring force must be sufficiently high to maintain constant contact between theroller 14 and thecam lobe 80. - A secondary function of the
spring seat 10 is to act as a guide for a lower end of thespring 6, maintaining it concentrically with the upper end of thespring 6. - A disadvantage of this prior art embodiment is that in addition to axial forces, the
spring 6 may apply a side load, i.e. radial force, to theplunger 4, via contact between thespring seat 10 and theplunger 4. Radial forces applied to theplunger 4 can cause wear, and possibly eventual seizure, of theplunger 4. -
EP1519033 A2 describes another pumping assembly according to the state of the art. - It is an object of the present invention to provide a pumping assembly which at least mitigates the problems encountered with known embodiments.
- Accordingly the present invention provides, in a first aspect, a pumping assembly according to claim 1.
- The pumping assembly comprises a first member and a second member, wherein the spring seat is provided on the first member, and wherein the second member is fixedly attached to the plunger.
- The second member is clipped into a groove provided in the plunger, and wherein arms of second member are located and free to move within longitudinally extending apertures provided in the first member.
- The first member may comprise a radial section which extends radially with respect to the pumping axis A; wherein the radial section is located between the second member and the housing part; and wherein the spring seat is provided by a surface of the radial section.
- The first member may further comprise an axial section which extends axially with respect to the pumping axis from a junction with the radial section, and wherein a surface of the axial section constrains the end of the spring in a radial direction.
- The pumping assembly may further comprise first member location means, for locating the first member with respect to the plunger.
- The first member location means may comprise walls or surfaces of a groove recess or a spigot provided on the shoe.
- The walls or surfaces of the groove recess or spigot may comprise walls or surfaces which are orthogonal to an upper surface of the shoe.
- The first member location means may comprise an annular groove recess provided in a top face of the shoe, remote from the roller, wherein the groove recess comprises tapered faces which act to centre the first member with respect to the plunger.
- In an alternative embodiment, the first member location means comprises a counter feature provided in a top face of the shoe, the counter feature comprising a tapered wall which acts to centre the first member with respect to the plunger.
- In a further alternative embodiment, the first member location means comprises a raised spigot provided on a top face of the shoe, wherein an outer face of the spigot acts to centre the first member with respect to the plunger.
- The present invention is now described by way of example with reference to the accompanying drawings in which:
-
Figure 2 is a longitudinal cross-sectional view of a pumping assembly in accordance with a first embodiment of the present invention; -
Figures 3 and 4 are detailed partial longitudinal cross-sectional views of the pumping assembly ofFigure 2 ; -
Figure 5 is a top view of a first member and a second member of the pumping assembly ofFigure 2 ; -
Figure 6 is a side view of the first and second members ofFigure 5 ; -
Figure 7 is an isometric view of a shoe in accordance with the first embodiment of the present invention; -
Figure 8 is an isometric view of a shoe in accordance with a second embodiment of the present invention;
and -
Figure 9 is an isometric view of a shoe in accordance with a third embodiment of the present invention. - An embodiment of the present invention is described below in relation to the orientation of the figures. Terms such as upper, lower, above, below, top, bottom, horizontal and vertical are not intended to be limiting.
- A
pumping assembly 102 according to a first embodiment of the present invention is illustrated inFigure 2 , and detailed views are provided inFigures 3 and 4 . Thepumping assembly 102 comprises a pumping element in the form of aplunger 104, and aspring 106 located in aspring chamber 108. Theplunger 104 is located such that a first,upper end 150 thereof is located within ahousing part 190, and a second,lower end 152 is located proximate ashoe 112. Rotation of acam lobe 180 of a driveshaft assembly causes force to be transmitted to theplunger 104, via aroller 114 and ashoe 112. The transferred force causes theplunger 104 to move in a reciprocating motion along a pumping axis A. - The
shoe 112 is located within avoid 160 of ashoe guide 116. - A seat guide, or
first member 120, and a plunger return clip, orsecond member 140, are located around, and towards the second,lower end 152 of theplunger 104. - The first and
second members first member 120 can be formed by deep drawing, with piercings to form side apertures (described below) and a lower opening. Thesecond member 140 can be a fine blanked component. - Referring to the detailed views of
Figures 3 and 4 , thefirst member 120 comprises a first, upper part 122 and a second,lower part 136. In the embodiment illustrated inFigures 2 to 4 , the first, upper part 122 is located in thespring chamber 108, and the second,lower part 136 is located at least partially within thevoid 160 of theshoe guide 116. - The first part 122 of the
first member 120 comprises anaxial section 124 and a radial section 126. Theaxial section 124 is remote from theshoe 112 and extends axially with respect to the plunging axis A. The radial section 126 is closer to theshoe 112 than theaxial section 124, and extends radially between ajunction 128 with the axial section, and ajunction 128 with thesecond part 136. - An
upper surface 130 of the radial section 126, acts as a spring seat for thespring 106. An end 118 of thespring 106, remote from thehousing part 190, abuts theupper surface 130 of the radial section 126; the end 118 of thespring 106 is therefore constrained in an axial direction by the radial section 126. The radial section 126, and therefore theupper surface 130, are of a radial width greater than that the coils of thespring 106, thereby providing a full spring seat. - An
inner surface 132 of theaxial section 124 constrains, in a radial direction, an outer diameter of thespring 106 towards the lower end 118. - The second,
lower part 136 of thefirst member 120 comprises an axial member which extends in the direction of the pumping axis A, from thejunction 134 with the first, upper part 122. - Towards the second,
lower end 152 of theplunger 104, proximate theshoe 112, is provided a second member location means, to fixedly attach thesecond member 140 to theplunger 104. In the illustrated embodiment, the locating means comprises aradial groove 162, into which thesecond member 140 is clipped. Accordingly, during operation of thepumping assembly 102, theplunger 104 and thesecond member 140 move together. - A first member location means is also provided, for locating the
first member 120. In the illustrated embodiment, the first member location means comprises anannular groove recess 166 provided in atop face 164 of theshoe 112, remote from theroller 114. Thegroove recess 166 can be added at a milling stage of production of theshoe 112. - Referring to
Figure 4 , thegroove recess 166 has a 'V' form, comprisingtapered surfaces lower face 168 at the bottom of the V between thetapered surfaces lower end face 138 of the second,lower part 136 of thefirst member 120 abuts against thelower face 168 of thegroove recess 166. - The tapered sides 170, 172 of the
groove recess 166 act to centre thefirst member 120 with respect to theplunger 104 during assembly. - The design of the
groove recess 166 is such that it has minimal effect on the structural and functional integrity of theshoe 112. -
Figures 5 and6 illustrate thefirst member 120 and thesecond member 140. As illustrated inFigure 5 , aclearance 174 is provided between a mainouter diameter 154 of thesecond member 140, and aninner diameter 156 of thefirst member 120. - The
second member 140 is provided with threearms 142, each of which are located within a corresponding aperture 138 (two of which are indicated onFigure 6 ), provided in the second,lower part 136 of thefirst member 120. - The
apertures 138 of thefirst member 120 extend longitudinally with respect to the pumping axis A, and each have a closed,upper end 146 proximate to the first part 122, and an open,lower end 144 remote from the first part 122. - A
circumferential clearance 176 is provided between each of the arms and aside wall 148 of theapertures 138. A minimum,axial clearance 178 is also present between atop surface 158 of eacharm 142 and the upper,closed end 146 of the 138 aperture in which it is located. - The
clearances second member 140 and theplunger 104, on a filling stroke, to separate from theshoe 112 and float on thearms 142 within theapertures 138. - Any area of contact between the
top face 158 of thearms 142 of thesecond member 140, and theblind end 146 of theapertures 138, is minimised byradii 182 provided at theblind end 146 of theapertures 138. Accordingly, frictional force as a result of contact between thearms 142 of thesecond member 140 and the blind ends 146 of theapertures 138, is also minimised, thus minimising any side forces transmitted by thespring 106 to theplunger 104 to an absolute minimum. - The 'C' clip design of the
second member 140 utilises the elasticity of the material such that it is in an interference fit in the plungerannular groove 162 on assembly only; when installed it is in a clearance fit, partly to reduce stresses, and partly to prevent transmission of torque between thefirst member 120 and theplunger 104 via thesecond member 140. - In the
shoe 112 of the first embodiment of the present invention, as illustrated separately inFigure 7 , the first member location means is provided by theannular groove recess 166. Alternative embodiments can comprise alternative first member location means as discussed below. - A second, alternative embodiment of shoe for use in the present invention is illustrated in
Figure 8 . Thealternative shoe 212, which is assembled into a pumping assembly in the same manner as the first embodiment, has a tapered body, i.e. thewalls 292 taper towards thetop surface 264 of theshoe 212, to assist assembly. Additional material may be added to the top of theshoe 212 to ensure structural integrity. - The
alternative shoe 212 has a counter feature comprising a flatcountersunk face 294 and atapered wall 296. On assembly, thefirst member 140 is located within thecounter feature 294, thetapered wall 296 acting as a first member location means, and also acts to centre thefirst member 120 with respect to theplunger 104, in the same manner as the groove recess of the first embodiment. - A third embodiment of shoe for use in the present invention is illustrated in
Figure 9 . The third embodiment ofshoe 312, which is assembled into a pumping assembly in the same manner as the first and second embodiments, also has a tapered body, withwalls 392 tapering towards thetop surface 364 of theshoe 312 to assist assembly. Additional material again may be added to the top of theshoe 312 to ensure structural integrity. The furtheralternative shoe 312 is provided with a raisedspigot 384. On assembly, thefirst member 120 locates around the raisedspigot 384. An outer, taperedface 398 of thespigot 384 acts as a first member location means, and also acts to centre thefirst member 120 with respect to theplunger 104. - In an alternative embodiment of shoe in accordance with the present invention, the first member location means may comprise a recess or a spigot having surfaces which are orthogonal to the upper surface of the shoe, rather than being tapered. For example, in the first embodiment, either or both of the
surfaces groove recess 166 could comprise a surface which is orthogonal to theupper surface 164 of theshoe 112. - Similarly, the
tapered wall 296 of the counter feature of the second embodiment ofshoe 212 could be orthogonal to theupper surface 264 of theshoe 212, and theouter face 398 of thespigot 384 of the third embodiment could be orthogonal to theupper surface 364 of theshoe 312. - In the present invention, the spring seat is located on top of the shoe, and is not in contact with the plunger, and therefore the prior art problem of wear and tear of the plunger caused by contact with the spring seat is avoided.
- In all embodiments of the present invention, the first member location means acts to centre the
first member 120 with respect to theplunger 104, therefore, contact between theplunger 104 and thefirst member 120 is not necessary to maintain thefirst member 120 concentrically. - The present invention is also considerably more cost effective to produce than prior art embodiments.
- A further advantage of the present invention is that a longer head turret can be fitted into a pump than could be for a pump including certain prior art spring seats, as the spring is guided on its outside diameter, thereby freeing up space on the inside of the spring. Additionally, apertures which are necessary for circulation of fuel and lubrication of contact faces are much easier to manufacture in the present invention.
-
- pumping
assembly 2 -
plunger 4 -
spring 6 -
spring seat 10 -
shoe 12 -
roller 14 -
spring chamber 8 -
cam lobe 80 -
-
pump assembly 102 -
plunger 104 -
spring 106 -
spring chamber 108 -
shoe -
roller 114 -
shoe guide 116 - spring end 118
-
first member 120 - first member first, upper part 122
- first member first part
axial section 124 - first member first part radial section 126
- junction axial/
radial sections 128 - radial section
upper surface 130 - axial section
inner surface 132 - junction /
second part 134 - first member second,
lower part 136 -
apertures 138 -
second member 140 -
second member arms 142 - lower open ends of
apertures 144 - upper closed ends of
apertures 146 -
aperture side walls 148 - plunger first,
upper end 150 - plunger second,
lower end 152 - second member main
outer diameter 154 - first member
inner diameter 156 - top surface
second member arm 158 -
shoe guide void 160 - plunger
radial groove 162 - shoe
top face - shoe top face
annular groove recess 166 - groove recess flat
lower face 168 - groove recess tapered
surfaces -
clearance 174 -
clearance 176 -
clearance 178 -
cam lobe 180 -
radii 182 -
housing part 190 - alternative shoes tapered
walls - alternative shoe countersunk
face 294 - alternative shoe counter tapered
wall 296 - further
alternative shoe spigot 384 - spigot
outer face 398 - pumping axis A
Claims (9)
- A pumping assembly (102) comprising a plunger (104) and a spring (106) located within a spring chamber (108), wherein a first end (150) of the plunger (104) is located within a housing part (190), and a second end (152) of the plunger (104) remote from the first end (150) is proximate a shoe (112, 212, 312), and wherein reciprocating movement of the plunger (104) is caused by force transferred from a rotating cam lobe (180), via a roller (114) and the shoe (112, 212, 312);
the pumping assembly (102) further comprising a spring seat against which an end (118) of the spring (106) remote from the housing part (190) abuts, wherein the spring seat is not in contact with the plunger (104;
the pumping assembly (102) comprising a first member (120) and a second member (140), wherein the spring seat is provided on the first member (120), and wherein the second member (140) is fixedly attached to the plunger (104);
wherein the second member (120) is clipped into a groove (162) provided in the plunger (104), and wherein arms (142) of second member (140) are located and free to move within longitudinally extending apertures (138) provided in the first member (120). - A pumping assembly (102) as claimed in claim 1 wherein the first member (120) comprises a radial section (126) which extends radially with respect to the pumping axis (A); wherein the radial section (126) is located between the second member (140) and the housing part (190); and wherein the spring seat is provided by a surface (130) of the radial section (126).
- A pumping assembly (102) as claimed in claim 2 wherein the first member (120) further comprises an axial section (124) which extends axially with respect to the pumping axis (A) from a junction (128) with the radial section (126), and wherein a surface (132) of the axial section (124) constrains the end (118) of the spring (106) in a radial direction.
- A pumping assembly (102) as claimed in any one of the preceding claims further comprising first member location means, for locating the first member (120) with respect to the plunger (104).
- A pumping assembly (102) as claimed in claim 4 wherein the first member location means comprises walls or surfaces of a groove recess or a spigot provided on the shoe (112, 212, 312).
- A pumping assembly (102) as claimed in claim 4 wherein the walls or surfaces of the groove recess or spigot comprise walls or surfaces which are orthogonal to an upper surface (164, 264, 364) of the shoe (112, 212, 312).
- A pumping assembly (102) as claimed in claim 5 wherein the first member location means comprises an annular groove recess (166) provided in a top face (164) of the shoe (112), remote from the roller (114), wherein the groove recess (166) comprises tapered faces (170, 172) which act to centre the first member (120) with respect to the plunger (104).
- A pumping assembly (102) as claimed in claim 5 wherein the first member location means comprises a counter feature provided in a top face (264) of the shoe (212), the counter feature comprising a tapered wall (296) which acts to centre the first member (120) with respect to the plunger (104).
- A pumping assembly (102) as claimed in claim 5 wherein the first member location means comprises a raised spigot (384) provided on a top face (364) of the shoe (312), wherein an outer face (398) of the spigot (384) acts to centre the first member (120) with respect to the plunger (104).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB1517506.0A GB201517506D0 (en) | 2015-10-05 | 2015-10-05 | Pumping assembly |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3153702A1 EP3153702A1 (en) | 2017-04-12 |
EP3153702B1 true EP3153702B1 (en) | 2021-03-03 |
Family
ID=54606054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16191554.1A Active EP3153702B1 (en) | 2015-10-05 | 2016-09-29 | Pumping assembly |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3153702B1 (en) |
KR (1) | KR102615449B1 (en) |
GB (1) | GB201517506D0 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9012843D0 (en) * | 1990-06-08 | 1990-08-01 | Lucas Ind Plc | Fuel injection apparatus |
DE10344459B4 (en) * | 2003-09-25 | 2012-06-14 | Robert Bosch Gmbh | Piston pump, in particular high-pressure piston pump |
JP5337824B2 (en) * | 2011-01-14 | 2013-11-06 | 日立オートモティブシステムズ株式会社 | High pressure fuel supply pump |
EP2660459B1 (en) * | 2012-05-03 | 2016-04-06 | Delphi International Operations Luxembourg S.à r.l. | Load reduction |
-
2015
- 2015-10-05 GB GBGB1517506.0A patent/GB201517506D0/en not_active Ceased
-
2016
- 2016-09-29 EP EP16191554.1A patent/EP3153702B1/en active Active
- 2016-10-04 KR KR1020160127670A patent/KR102615449B1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
KR102615449B1 (en) | 2023-12-19 |
EP3153702A1 (en) | 2017-04-12 |
GB201517506D0 (en) | 2015-11-18 |
KR20170040758A (en) | 2017-04-13 |
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