WO2019151039A1 - Fuel pump assembly structure - Google Patents
Fuel pump assembly structure Download PDFInfo
- Publication number
- WO2019151039A1 WO2019151039A1 PCT/JP2019/001828 JP2019001828W WO2019151039A1 WO 2019151039 A1 WO2019151039 A1 WO 2019151039A1 JP 2019001828 W JP2019001828 W JP 2019001828W WO 2019151039 A1 WO2019151039 A1 WO 2019151039A1
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- WO
- WIPO (PCT)
- Prior art keywords
- tappet
- adapter
- camshaft
- insertion hole
- pin
- Prior art date
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Classifications
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- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/06—Feeding by means of driven pumps mechanically driven
-
- 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
- F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
- F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
-
- 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
-
- 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
- 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
- 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
- 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
- This disclosure relates to a fuel pump assembly structure.
- Patent Document 1 describes an engine provided with a high-pressure fuel pump.
- a valve operating chamber is formed between the cylinder head of the engine and the cam housing, and an intake cam shaft and an exhaust cam shaft are accommodated in the valve operating chamber.
- the exhaust camshaft is provided with a plurality of exhaust cams for raising and lowering the exhaust valve and one drive cam for driving the high-pressure fuel pump.
- a part of the cam housing constitutes a pump housing part which is a part of the high-pressure fuel pump.
- a guide hole facing the drive cam is formed in the pump housing portion, and a tappet is provided in the guide hole so as to be movable up and down.
- a guide hole is formed in the outer peripheral surface of the tappet.
- a boss portion is provided in the pump housing portion, and a bolt hole is formed in the boss portion. The tip of the bolt screwed into the bolt hole is inserted into the guide hole on the outer peripheral surface of the tappet, thereby preventing the tappet from rotating and tilting when the tappet advances and retreats.
- the bolt hole for screwing the bolt that stops the tappet is formed in the pump housing part that is a part of the cam housing of the engine. May leak from the bolt hole to the outside of the engine.
- the groove is formed inside the hole. Therefore, it is difficult to form the groove as compared with the case where the groove is formed on the outer peripheral surface of the tappet, and the work efficiency may be deteriorated and the processing cost may be increased.
- An object of the present disclosure is to provide a fuel pump assembly structure capable of preventing oil leakage while preventing rotation of the tappet.
- the fuel pump assembly structure includes a camshaft housing, an adapter, and a fuel pump.
- the camshaft housing has an adapter insertion hole extending in a predetermined direction from the internal opening that opens toward the cam of the camshaft of the engine, and accommodates the camshaft therein.
- the adapter extends along the predetermined direction and is disposed in a cylindrical cylinder part in which at least a part of the adapter part is inserted into the adapter insertion hole of the camshaft housing, and in an area of the cylinder part inserted into the adapter insertion hole.
- a protrusion that protrudes radially inward from the inner peripheral surface of the cylinder, and is fixed to the camshaft housing.
- the fuel pump has a tappet that is slidably supported in the predetermined direction on the inner peripheral surface of the cylinder portion of the adapter while supporting a roller that contacts the cam. And the fuel is supplied to the engine side using the reciprocating motion of the tappet.
- On the outer peripheral surface of the tappet there is formed a groove portion that extends linearly along the predetermined direction and that engages with the protruding portion while allowing the protruding portion of the adapter to be inserted. The engagement between the protruding portion of the adapter and the groove portion of the tappet allows the tappet to reciprocate along the predetermined direction and restricts the rotational movement of the tappet in the direction crossing the groove portion.
- the protruding portion of the adapter protrudes radially inward from the inner peripheral surface of the cylinder portion, and the adapter protruding portion is inserted into the outer peripheral surface of the tappet of the fuel pump in a straight line along a predetermined direction. Grooves that are allowed to engage with the protrusions are formed. For this reason, by properly arranging the protrusion of the adapter and the groove of the tappet, when the tappet is inserted into the cylinder of the adapter, the rotation of the camshaft rotation shaft (cam rotation shaft) and the fuel pump roller The shafts can be easily positioned so as to be substantially parallel to each other.
- the engagement between the protruding portion of the adapter and the groove portion of the tappet regulates the rotational movement of the tappet in the direction crossing the groove portion. For this reason, when the fuel pump is driven (when the tappet is reciprocated), the cam shaft and the rotation axis of the roller of the fuel pump set when the tappet is inserted into the cylinder portion of the adapter. It can be prevented that the direction of rotation (direction intersecting with the groove portion) is not substantially parallel, and seizure between the cam and the roller can be prevented.
- the protruding part of the adapter is arranged in the area inserted into the adapter insertion hole in the cylinder part. Therefore, for example, a pin insertion hole penetrating in the radial direction is provided in the cylinder portion of the adapter, and the pin is protruded by inserting the pin into the pin insertion hole and projecting radially inward from the inner peripheral surface of the cylinder portion. Since the pin insertion hole is located in the area of the cylinder part that is inserted into the adapter insertion hole of the camshaft housing, oil that flows out of the cylinder part from the pin insertion hole is camped. It can be retained in the shaft housing. Accordingly, oil can be prevented from flowing out of the camshaft housing.
- an adapter is provided between the camshaft housing and the fuel pump, and the inner peripheral surface of the cylinder portion of the adapter slidably supports the tappet, so even if the cylinder portion is damaged by the sliding of the tappet, the adapter This can be dealt with by replacing the fuel pump, and unlike the case where the fuel pump is directly attached to the camshaft housing, there is no need to replace the camshaft housing.
- oil leakage can be prevented while preventing the tappet from rotating.
- FIG. 1 is a schematic diagram of an engine to which a fuel pump assembly structure according to an embodiment of the present disclosure is applied.
- FIG. 2 is a schematic view of FIG. 1 viewed from the direction of arrow II.
- FIG. 3 is a schematic cross-sectional view of the main part of the fuel pump assembly structure.
- FIG. 4 is an external perspective view of the adapter.
- FIG. 5 is an enlarged view of a main part of the supply pump.
- FIG. 6 is a cross-sectional view showing an engaged state between the pin and the slide groove.
- the fuel pump assembly structure includes, for example, a supply pump (fuel pump) of a diesel engine 1 (hereinafter simply referred to as the engine 1) having a common rail fuel injection system. Applies to 50 assembly structures.
- the fuel in the fuel tank 2 is supplied to the supply pump 50 side by the feed pump 3, the fuel is pressurized by the supply pump 50 and supplied to the common rail 4, and the high pressure pressurized by the supply pump 50 is supplied.
- the common rail fuel injection system the fuel in the fuel tank 2 is supplied to the supply pump 50 side by the feed pump 3, the fuel is pressurized by the supply pump 50 and supplied to the common rail 4, and the high pressure pressurized by the supply pump 50 is supplied.
- the common rail fuel injection system the fuel in the fuel tank 2 is supplied to the supply pump 50 side by the feed pump 3, the fuel is pressurized by the supply pump 50 and supplied to the common rail 4, and the high pressure pressurized by the supply pump 50 is supplied.
- the common rail fuel injection system the fuel in the fuel tank 2 is supplied to the supply pump 50 side by the
- the fuel injected from the injector 5 into the combustion chamber 6 is ignited and burned by the high-temperature air compressed by the piston 7 in the combustion chamber 6, and the gas expanded by this combustion pushes down the piston 7 to The crankshaft 8 is rotated.
- FIG. 2 only one combustion chamber 6 is shown.
- the engine 1 has an intake valve 11 that controls intake air to the combustion chamber 6, an exhaust valve 12 that controls exhaust gas from the combustion chamber 6, a feed pump 3, and a camshaft 13 for driving a supply pump 50.
- the cylinder block 1a of the engine 1 supports the camshaft 13 rotatably.
- a shaft housing space 21 (see FIG. 3) for housing the camshaft 13 is formed inside the cylinder block 1a. That is, a part of the cylinder block 1a functions as a camshaft housing 20 (see FIG. 3) that forms the shaft housing space 21.
- the intake valve 11 and the exhaust valve 12 are connected to the push rod 16 via the arm 15 and are driven by the rotation of the camshaft 13.
- FIG. 2 the arm 15 and the push rod 16 on the intake valve 11 side are shown, and the illustration of the arm 15 and the push rod 16 on the exhaust valve 12 side is omitted.
- the camshaft 13 is a rod-shaped member, and integrally includes a plurality of cams, and is rotatably supported by the cylinder block 1a of the engine 1.
- the plurality of cams include a plurality of intake valve drive cams 17, a plurality of exhaust valve drive cams 18 (only one exhaust valve drive cam 18 is shown in FIG. 3), and a feed pump drive cam 19. And a supply pump drive cam (cam) 14.
- the camshaft 13 has a rotation axis CL2 extending in the axial direction (extending direction) of the camshaft 13, and is arranged so that the rotation axis CL2 of the camshaft 13 is substantially parallel to the rotation axis CL1 of the crankshaft 8. .
- An input gear 9 is fixedly provided at an end portion on one end side of the camshaft 13.
- the input gear 9 of the camshaft 13 is connected to the crankshaft 8 via a gear or a chain.
- a force for rotating the camshaft 13 is input from the crankshaft 8 to the input gear 9 of the camshaft 13, and the camshaft 13 rotates as the crankshaft 8 rotates.
- the tip of the push rod 16 on the intake valve 11 side is in contact with the intake valve drive cam 17, and the tip of the push rod 16 on the exhaust valve 12 side is in contact with the exhaust valve drive cam 18.
- the tappet roller (not shown) of the feed pump 3 comes into contact with the supply pump drive cam 14, and a tappet roller (roller) 51, which will be described later, of the supply pump 50 comes into contact.
- the intake valve drive cam 17 drives the intake valve 11
- the exhaust valve drive cam 18 drives the exhaust valve 12
- the feed pump drive cam 19 drives the feed pump 3
- the supply pump drive cam 14 drives the supply pump 50. To do.
- the fuel pump assembly structure includes a camshaft housing 20, an adapter 30, and a supply pump 50 of the engine 1.
- the camshaft housing 20 has an adapter insertion hole 22 penetrating along the vertical direction (predetermined direction), and forms a shaft housing space 21.
- the adapter insertion hole 22 communicates the shaft housing space 21 with the outside of the camshaft housing 20.
- the adapter insertion hole 22 extends in a direction crossing the rotation axis CL2 of the camshaft 13.
- An opening 23 on the shaft housing space 21 side of the adapter insertion hole 22 (hereinafter referred to as an internal opening 23) is disposed at a position spaced upward from the supply pump drive cam 14 of the camshaft 13 housed in the shaft housing space 21. , Opening toward the supply pump drive cam 14.
- the adapter 30 includes a cylindrical cylinder portion 31 that extends in the vertical direction, a flange-like flange portion 32 that extends radially outward from the upper end portion of the cylinder portion 31, and the cylinder portion 31.
- the pin 37 is fixed to the camshaft housing 20.
- the cylinder part 31 is inserted into the adapter insertion hole 22 of the camshaft housing 20 from above. With the cylinder portion 31 inserted into the adapter insertion hole 22 of the camshaft housing 20 from above, the flange portion 32 is disposed outside the camshaft housing 20, and the upper surface of the camshaft housing 20 around the adapter insertion hole 22 It is fastened and fixed to. A seal member (not shown) such as a gasket is interposed between the flange portion 32 and the upper surface of the camshaft housing 20 around the adapter insertion hole 22.
- the cylinder portion 31 has a pump insertion hole 35 that communicates the upper end opening 33 and the lower end opening 34 and extends linearly in the vertical direction.
- the direction in which the axis of the pump insertion hole 35 extends is a direction orthogonal to the rotation axis CL2 of the camshaft 13.
- the lower end opening 34 is disposed at a position spaced upward from the supply pump drive cam 14 of the camshaft 13 accommodated in the shaft accommodation space 21 and opens toward the supply pump drive cam 14.
- a pin is inserted that penetrates the cylinder portion 31 in the radial direction (in the present embodiment, the direction orthogonal to the axis of the cylinder portion 31).
- a hole 38 is formed.
- the pin insertion hole 38 extends along a direction orthogonal to the rotation axis CL2 of the camshaft 13 in a top view.
- the position where the pin insertion hole 38 is provided is included in a range in which the later-described tappet 52 of the supply pump 50 slides in the region 36 of the cylinder portion 31.
- the pin 37 is a rod that extends along the pin insertion hole 38 of the cylinder part 31, and is pressed into the pin insertion hole 38 and fixed to the cylinder part 31. That is, the pin 37 extends along a direction orthogonal to the rotation axis CL2 of the camshaft 13 in a top view.
- the outer end of the radial pin 37 of the cylinder part 31 is disposed on substantially the same surface as the outer peripheral surface 31 a of the cylinder part 31.
- the inner end of the pin 37 is disposed on the radially inner side with respect to the inner peripheral surface 31 b of the cylinder portion 31. That is, the pin 37 has a protruding portion 39 (see FIG.
- the supply pump 50 is a piston type pump having a pump main body 53, a plunger 54, a tappet 52, and a tappet roller 51, and the rotational movement of the camshaft 13 is reciprocated between the tappet roller 51 and the tappet 52. This is converted into motion, and the plunger 54 in the pump body 53 is reciprocated by the reciprocating motion of the tappet 52 to supply the fuel supplied from the feed pump 3 to the common rail 4 (see FIG. 1) side.
- the supply pump 50 is fixed to the camshaft housing 20 via the adapter 30.
- the tappet 52 is formed in a substantially cylindrical shape, and its outer peripheral surface 52 c slides along the inner peripheral surface 31 b of the cylinder portion 31 of the adapter 30, and moves up and down in the cylinder portion 31. Move back and forth.
- the sliding range 62 of the tappet 52 (range of reciprocating movement) is such that the lower end 52a of the tappet 52 at the top dead center (position indicated by a two-dot chain line in FIG. 5) is at the bottom dead center (position indicated by a solid line in FIG. 5). It is set to be positioned below the upper end 52b of the tappet 52.
- the sliding range 62 of the tappet 52 has an area 63 where the tappet 52 always exists when the tappet 52 reciprocates (between the lower end 52a of the tappet 52 at the top dead center and the upper end 52b of the tappet 52 at the bottom dead center).
- An area (hereinafter referred to as an overlapping area 63) exists.
- the pin insertion hole 38 (see FIG. 4) of the cylinder part 31 is located within the sliding range 62 of the tappet 52 in the above-described area 36 of the cylinder part 31 (area 36 inserted into the adapter insertion hole 22 of the camshaft housing 20). It is formed at a height position (position indicated by a one-dot chain line 64 in FIG.
- a wall portion 60 that partitions the inner diameter portion into an upper region and a lower region is provided at the inner diameter portion of the tappet 52.
- the outer peripheral surface 52c of the tappet 52 is formed with a slide groove portion (groove portion) 61 that extends linearly along the vertical direction while being recessed radially inward from the outer peripheral surface 52c. .
- the slide groove portion 61 extends downward from a predetermined height position below the upper end 52 b of the tappet 52 and is opened downward from the lower end 52 a of the tappet 52.
- the slide groove 61 is formed in a size that allows the protrusion 39 of the pin 37 of the adapter 30 to be inserted and engages with the protrusion 39 of the pin 37.
- the width of the slide groove 61 (the length in the circumferential direction of the tappet 52) is such that the tappet 52 rotates relative to the adapter 30 when the slide groove 61 of the tappet 52 and the protrusion 39 of the pin 37 of the adapter 30 are engaged. It is set slightly longer than the diameter of the pin 37 so that (the movement of the tappet 52 in the circumferential direction) is restricted.
- the length (vertical length) of the slide groove 61 is longer than the diameter of the pin 37, and the top dead center and bottom dead of the tappet 52 in a state where the protrusion 39 of the pin 37 is inserted into the slide groove 61. It is set to a length that allows movement between points.
- the upper end of the slide groove 61 is set so as to be positioned above the height position 64 of the pin 37 in a state where the tappet 52 is at the bottom dead center, and the lower end of the slide groove 61 (in this embodiment, the tappet 52 The lower end 52a) of the pin 37 is set to be positioned below the height position 64 of the pin 37 in a state where the tappet 52 is at the top dead center.
- a tappet roller 51 is disposed in a region below the wall portion 60 of the inner diameter portion of the tappet 52.
- the tappet roller 51 is rotatably supported by a pair of roller support portions 65 extending downward from the tappet 52 via a shaft bar 66.
- the pair of roller support portions 65 are opposed to each other in the direction in which the rotation axis CL2 of the camshaft 13 extends, and the shaft rod 66 is located between the pair of roller support portions 65 along the rotation axis CL2 of the camshaft 13. Extends linearly. That is, the direction in which the shaft bar 66 extends (the direction in which the rotation axis CL3 of the tappet roller 51 extends) is set to be substantially parallel to the rotation axis CL2 of the camshaft 13 and orthogonal to the direction in which the slide groove 61 is recessed. Is done.
- the tappet roller 51 abuts on the supply pump drive cam 14 while being biased toward the lower supply pump drive cam 14.
- the tappet roller 51 rotates around the rotation axis CL3, and the tappet roller 51, the tappet 52, and the plunger 54 reciprocate along the vertical direction. Pressurizes the fuel in the pump chamber of the pump body 53 and supplies it to the common rail 4 side. That is, the supply pump 50 converts the rotational motion of the camshaft 13 into the reciprocating motion of the tappet 52, reciprocates the plunger 54 using the reciprocating motion of the tappet 52, pressurizes the fuel, and supplies the fuel to the common rail 4. To do. Oil is supplied to the outer peripheral surface 52c of the tappet 52 and the tappet roller 51 of the supply pump 50 from an oil passage (not shown).
- the tappet 52 supporting the tappet roller 51 is first inserted into the pump insertion hole 35 of the adapter 30 from above and from the lower end of the slide groove 61 of the tappet 52.
- the pin 37 of the adapter 30 is inserted and engaged.
- the plunger 54 is inserted into the pump insertion hole 35 of the adapter 30 from above, and the flange portion 53a of the pump main body 53 is fastened and fixed to the adapter 30 so that the supply pump 50 and the adapter 30 are unitized.
- the cylinder portion 31 of the adapter 30 unitized with the supply pump 50 is inserted into the adapter insertion hole 22 of the camshaft housing 20 of the engine 1 from above, and the flange portion 32 of the adapter 30 is inserted into the camshaft housing 20. Fasten and fix against.
- the method for assembling the supply pump 50 to the engine 1 is not limited to the above. For example, first, the adapter 30 is fastened and fixed to the camshaft housing 20, and then the supply pump is fixed to the adapter 30. The method of fixing 50 may be used.
- the protruding portion 39 of the pin 37 of the adapter 30 protrudes radially inward from the inner peripheral surface 31b of the cylinder portion 31, and the outer peripheral surface 52c of the tappet 52 of the supply pump 50. It engages with the slide groove 61 formed in the.
- the direction in which the rotation axis CL3 of the tappet roller 51 extends is set substantially parallel to the rotation axis CL2 of the camshaft 13.
- the direction of the rotation axis CL3 of the tappet roller 51 is the desired direction (in this embodiment, the camshaft 13 A protrusion 39 on the adapter 30 side and a slide groove 61 on the supply pump 50 side are arranged so as to be in a direction substantially parallel to the rotation axis CL2. Therefore, when the supply pump 50 is attached to the adapter 30, the rotation groove CL 2 of the camshaft 13 and the tappet roller 51 of the supply pump 50 are engaged by engaging the slide groove 61 of the tappet 52 and the pin 37 of the adapter 30.
- the rotation axis CL3 can be easily positioned so as to be substantially parallel to each other.
- the engagement between the slide groove portion 61 of the tappet 52 and the protruding portion 39 of the pin 37 of the adapter 30 is the rotational movement of the tappet 52 relative to the adapter 30 (movement of the tappet 52 in the circumferential direction (direction intersecting the slide groove portion 61)). ). Therefore, the substantially parallel positional relationship between the rotation axis CL2 of the camshaft 13 and the rotation axis CL3 of the tappet roller 51 of the supply pump 50 changes in the rotation direction when the supply pump 50 is driven (when the tappet 52 reciprocates). Thus, it can be prevented that the supply pump drive cam 14 and the tappet roller 51 are burned.
- the protruding portion 39 of the pin 37 of the adapter 30 is disposed in a region 36 of the cylinder portion 31 that is inserted into the adapter insertion hole 22 of the camshaft housing 20. For this reason, even if oil flows out from the pin insertion hole 38 of the adapter 30 to the outside of the cylinder portion 31, the oil does not flow out of the engine 1 (outside of the camshaft housing 20), and the oil flows to the camshaft housing. 20 can be retained within the camshaft housing 20 to prevent the oil from flowing out of the camshaft housing 20.
- the adapter 30 is provided between the camshaft housing 20 and the supply pump 50, and the inner peripheral surface 31b of the cylinder portion 31 of the adapter 30 supports the tappet 52 in a slidable manner. Even if the inner peripheral surface 31b of the portion 31 is damaged, it can be dealt with by replacing the adapter 30, and it is necessary to replace the camshaft housing 20, unlike the case where the supply pump 50 is directly attached to the camshaft housing 20. There is no.
- a part of the cylinder block 1a of the engine 1 is made to function as the camshaft housing 20, but the camshaft housing 20 is not limited to this, for example, the inside of the cylinder head of the engine 1 Alternatively, the camshaft 13 may be arranged so that a part of the cylinder head of the engine 1 functions as the camshaft housing 20.
- the direction in which the adapter insertion hole 22 of the camshaft housing 20 and the pump insertion hole 35 of the adapter 30 extend is the vertical direction, but the predetermined direction is limited to this. Instead, any other direction may be used as long as the direction is orthogonal to the rotation axis CL2 of the camshaft 13.
- the camshaft 13 having a plurality of cams (a plurality of intake valve drive cams 17, a plurality of exhaust valve drive cams 18, a feed pump drive cam 19, and a supply pump drive cam 14) is provided.
- the camshaft 13 is not limited to this, and any camshaft 13 having at least a supply pump drive cam (cam) 14 may be used.
- a pin insertion hole 38 is provided in the cylinder portion 31 of the adapter 30, the pin 37 is press-fitted into the pin insertion hole 38, and the pin 37 protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31.
- the protrusion part 39 was formed by making it, the protrusion part 39 is not limited to this.
- a bolt insertion hole is provided in the cylinder portion 31, a bolt is screwed into the bolt insertion hole from the outside, and the tip end side of the bolt protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31.
- a part may be formed.
- a protruding portion that protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31 may be integrally formed with the cylinder portion 31.
- the protruding portion 39 of the pin 37 protrudes in a direction orthogonal to the rotation axis CL2 of the camshaft 13 when viewed from above.
- the protruding portion 39 is provided at the portion of the cylinder portion 31 that intersects the imaginary line orthogonal to the rotation axis CL2 of the camshaft 13 in the top view, but the position where the protruding portion 39 is provided is It is not limited to this,
- the protrusion part 39 can be provided in the arbitrary positions of the circumferential direction of the cylinder part 31. FIG.
- the slide groove portion 61 provided in the tappet 52 can also be provided at an arbitrary position in the circumferential direction of the outer peripheral surface 52 c of the tappet 52. That is, with the protrusion 39 on the adapter 30 side and the slide groove 61 on the supply pump 50 side engaged, the direction of the rotation axis CL3 of the tappet roller 51 is the desired direction (in this embodiment, the camshaft 13
- the protruding portion 39 on the adapter 30 side and the slide groove portion 61 on the supply pump 50 side can be arranged so as to be in a direction substantially parallel to the rotation axis CL2.
- the lower side of the slide groove 61 is opened downward from the lower end 52a of the tappet 52.
- the slide groove 61 is a protrusion of the pin 37 on the adapter 30 side. What is necessary is just to have the length which accept
- the fuel pump assembly structure according to the present disclosure is applied to the assembly structure of the supply pump 50 that is a high-pressure fuel pump.
- the present invention is not limited to this. You may apply to an assembly structure.
- this indication was demonstrated based on the said embodiment, this indication is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this indication. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present disclosure.
- the fuel pump assembly structure according to the present disclosure is applied to the diesel engine 1, but may be applied to a gasoline engine. Further, the present invention may be applied to an engine that does not include a common rail fuel injection system.
- the fuel pump assembly structure of the present disclosure is useful in terms of preventing oil leakage while preventing rotation of the tappet.
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Abstract
In the present invention, a camshaft housing has an adapter insertion hole penetrating along the up-down direction, and the inner opening of the adapter insertion hole opens toward a supply pump drive cam. An adapter has a tube-shaped cylinder part and a pin fixed to the cylinder part, and the adapter is fixed to the camshaft housing. The pin has a protruding part that protrudes radially inward from the inner peripheral surface of the cylinder part. A slide groove section that extends linearly along the up-down direction is formed in the outer peripheral surface of a tappet of a supply pump. The slide groove section permits insertion of the protruding part of the pin and engages with the protruding part, and permits reciprocal movement of the tappet. The engaging between the slide groove section and the protruding part of the pin regulates rotation movement of the tappet relative to the adapter.
Description
本開示は、燃料ポンプ組付構造に関する。
This disclosure relates to a fuel pump assembly structure.
特許文献1には、高圧燃料ポンプが設けられたエンジンが記載されている。エンジンのシリンダヘッドとカムハウジングとの間には動弁室が形成されており、動弁室には吸気カムシャフトおよび排気カムシャフトが収容されている。排気カムシャフトには、排気弁を昇降させる複数の排気カムおよび高圧燃料ポンプを駆動する1つの駆動カムが設けられている。カムハウジングの一部は、高圧燃料ポンプの一部であるポンプハウジング部を構成している。ポンプハウジング部には駆動カムに対向するガイド孔が形成されており、このガイド孔にはタペットが昇降自在に設けられている。タペットの外周面にはガイド穴が形成されている。ポンプハウジング部にはボス部が設けられており、このボス部にはボルト穴が形成されている。ボルト穴に螺合されたボルトの先端部は、タペットの外周面のガイド穴に挿通され、タペットの進退時にタペットの回転や傾きの発生を防止する。
Patent Document 1 describes an engine provided with a high-pressure fuel pump. A valve operating chamber is formed between the cylinder head of the engine and the cam housing, and an intake cam shaft and an exhaust cam shaft are accommodated in the valve operating chamber. The exhaust camshaft is provided with a plurality of exhaust cams for raising and lowering the exhaust valve and one drive cam for driving the high-pressure fuel pump. A part of the cam housing constitutes a pump housing part which is a part of the high-pressure fuel pump. A guide hole facing the drive cam is formed in the pump housing portion, and a tappet is provided in the guide hole so as to be movable up and down. A guide hole is formed in the outer peripheral surface of the tappet. A boss portion is provided in the pump housing portion, and a bolt hole is formed in the boss portion. The tip of the bolt screwed into the bolt hole is inserted into the guide hole on the outer peripheral surface of the tappet, thereby preventing the tappet from rotating and tilting when the tappet advances and retreats.
特許文献1に記載の高圧燃料ポンプでは、タペットの周り止めのボルトを螺合するためのボルト穴が、エンジンのカムハウジングの一部であるポンプハウジング部に形成されるので、ポンプハウジング部内のオイルがボルト穴からエンジンの外部へ漏れてしまう可能性がある。このオイル漏れを回避するために、タペットの外周面に突出部を設け、ポンプハウジング部のガイド孔の内周面に溝を設けることが考えられるが、この場合、孔の内部に溝を成形するので、タペットの外周面に溝を成形する場合に比べて溝の成形が難しく、作業の効率性が悪化して加工コストが増大する可能性がある。
In the high-pressure fuel pump described in Patent Document 1, the bolt hole for screwing the bolt that stops the tappet is formed in the pump housing part that is a part of the cam housing of the engine. May leak from the bolt hole to the outside of the engine. In order to avoid this oil leakage, it is conceivable to provide a protrusion on the outer peripheral surface of the tappet and provide a groove on the inner peripheral surface of the guide hole of the pump housing part. In this case, the groove is formed inside the hole. Therefore, it is difficult to form the groove as compared with the case where the groove is formed on the outer peripheral surface of the tappet, and the work efficiency may be deteriorated and the processing cost may be increased.
本開示の目的は、タペットの回転を防止しつつオイル漏れを防止することが可能な燃料ポンプ組付構造を提供することである。
An object of the present disclosure is to provide a fuel pump assembly structure capable of preventing oil leakage while preventing rotation of the tappet.
本開示に係る燃料ポンプ組付構造は、カムシャフトハウジングとアダプタと燃料ポンプとを備える。カムシャフトハウジングは、エンジンのカムシャフトのカムに向かって開口する内部開口から外部へ向かって所定方向に沿って延びるアダプタ挿入孔を有し、内部にカムシャフトを収容する。アダプタは、上記所定方向に沿って延びて少なくとも一部の領域がカムシャフトハウジングのアダプタ挿入孔に挿入される筒状のシリンダ部と、シリンダ部のうちアダプタ挿入孔に挿入された領域に配置されて、シリンダ部の内周面から径方向内側へ突出する突出部とを有し、カムシャフトハウジングに対して固定される。燃料ポンプは、カムに当接するローラを支持した状態でアダプタのシリンダ部の内周面に上記所定方向に摺動自在に支持されるタペットを有し、カムシャフトのカムの回転運動を上記所定方向に沿ったタペットの往復運動に変換し、タペットの往復運動を利用して燃料をエンジン側へ供給する。タペットの外周面には、上記所定方向に沿って直線状に延び、アダプタの突出部の挿入を許容して突出部と係合する溝部が形成される。アダプタの突出部とタペットの溝部との係合は、上記所定方向に沿ったタペットの往復移動を許容し、且つ溝部と交叉する方向へのタペットの回転移動を規制する。
The fuel pump assembly structure according to the present disclosure includes a camshaft housing, an adapter, and a fuel pump. The camshaft housing has an adapter insertion hole extending in a predetermined direction from the internal opening that opens toward the cam of the camshaft of the engine, and accommodates the camshaft therein. The adapter extends along the predetermined direction and is disposed in a cylindrical cylinder part in which at least a part of the adapter part is inserted into the adapter insertion hole of the camshaft housing, and in an area of the cylinder part inserted into the adapter insertion hole. And a protrusion that protrudes radially inward from the inner peripheral surface of the cylinder, and is fixed to the camshaft housing. The fuel pump has a tappet that is slidably supported in the predetermined direction on the inner peripheral surface of the cylinder portion of the adapter while supporting a roller that contacts the cam. And the fuel is supplied to the engine side using the reciprocating motion of the tappet. On the outer peripheral surface of the tappet, there is formed a groove portion that extends linearly along the predetermined direction and that engages with the protruding portion while allowing the protruding portion of the adapter to be inserted. The engagement between the protruding portion of the adapter and the groove portion of the tappet allows the tappet to reciprocate along the predetermined direction and restricts the rotational movement of the tappet in the direction crossing the groove portion.
上記構成では、アダプタの突出部が、シリンダ部の内周面から径方向内側へ突出し、燃料ポンプのタペットの外周面には、所定方向に沿って直線状に延びてアダプタの突出部の挿入を許容して突出部と係合する溝部が形成される。このため、アダプタの突出部とタペットの溝部とを適切に配置することによって、タペットをアダプタのシリンダ部内に挿入する際に、カムシャフトの回転軸(カムの回転軸)と燃料ポンプのローラの回転軸とを、互いに略平行になるように容易に位置決めすることができる。
In the above-described configuration, the protruding portion of the adapter protrudes radially inward from the inner peripheral surface of the cylinder portion, and the adapter protruding portion is inserted into the outer peripheral surface of the tappet of the fuel pump in a straight line along a predetermined direction. Grooves that are allowed to engage with the protrusions are formed. For this reason, by properly arranging the protrusion of the adapter and the groove of the tappet, when the tappet is inserted into the cylinder of the adapter, the rotation of the camshaft rotation shaft (cam rotation shaft) and the fuel pump roller The shafts can be easily positioned so as to be substantially parallel to each other.
また、アダプタの突出部とタペットの溝部との係合は、溝部と交叉する方向へのタペットの回転移動を規制する。このため、タペットをアダプタのシリンダ部内に挿入する際に設定したカムの回転軸と燃料ポンプのローラの回転軸との略平行な位置関係が、燃料ポンプの駆動時(タペットの往復移動時)に回転方向(溝部と交叉する方向)に変化して略平行ではなくなってしまうことを防止することができ、カムとローラとの焼け付き等を防止することができる。
Also, the engagement between the protruding portion of the adapter and the groove portion of the tappet regulates the rotational movement of the tappet in the direction crossing the groove portion. For this reason, when the fuel pump is driven (when the tappet is reciprocated), the cam shaft and the rotation axis of the roller of the fuel pump set when the tappet is inserted into the cylinder portion of the adapter. It can be prevented that the direction of rotation (direction intersecting with the groove portion) is not substantially parallel, and seizure between the cam and the roller can be prevented.
また、アダプタの突出部は、シリンダ部のうちアダプタ挿入孔に挿入された領域に配置される。このため、例えば、アダプタのシリンダ部に径方向に貫通するピン挿入孔を設け、該ピン挿入孔にピンを挿入してシリンダ部の内周面から径方向内側へ突出させることによってピンを突出部として機能させる場合であっても、ピン挿入孔がシリンダ部のうちカムシャフトハウジングのアダプタ挿入孔に挿入された領域に配置されているので、ピン挿入孔からシリンダ部の外部へ流出するオイルをカムシャフトハウジング内に留めることができる。従って、カムシャフトハウジングの外部へのオイルの流出を防止することができる。
Also, the protruding part of the adapter is arranged in the area inserted into the adapter insertion hole in the cylinder part. Therefore, for example, a pin insertion hole penetrating in the radial direction is provided in the cylinder portion of the adapter, and the pin is protruded by inserting the pin into the pin insertion hole and projecting radially inward from the inner peripheral surface of the cylinder portion. Since the pin insertion hole is located in the area of the cylinder part that is inserted into the adapter insertion hole of the camshaft housing, oil that flows out of the cylinder part from the pin insertion hole is camped. It can be retained in the shaft housing. Accordingly, oil can be prevented from flowing out of the camshaft housing.
また、カムシャフトハウジングと燃料ポンプとの間にアダプタを設け、アダプタのシリンダ部の内周面がタペットを摺動自在に支持するので、仮にタペットの摺動によってシリンダ部が損傷したとしても、アダプタを交換することによって対処することができ、燃料ポンプをカムシャフトハウジングに直接取り付ける場合とは異なり、カムシャフトハウジングを交換する必要が無い。
In addition, an adapter is provided between the camshaft housing and the fuel pump, and the inner peripheral surface of the cylinder portion of the adapter slidably supports the tappet, so even if the cylinder portion is damaged by the sliding of the tappet, the adapter This can be dealt with by replacing the fuel pump, and unlike the case where the fuel pump is directly attached to the camshaft housing, there is no need to replace the camshaft housing.
本開示によれば、タペットの回転を防止しつつオイル漏れを防止することができる。
According to the present disclosure, oil leakage can be prevented while preventing the tappet from rotating.
以下、本開示の一実施形態を図面に基づいて説明する。なお、以下の説明において、上下方向は、図1~図6の上下方向に対応する。また、各図において、CL1はクランクシャフト8の回転軸を、CL2はカムシャフト13の回転軸を、CL3はサプライポンプ50のタペットローラ51の回転軸をそれぞれ示す。
Hereinafter, an embodiment of the present disclosure will be described based on the drawings. In the following description, the vertical direction corresponds to the vertical direction in FIGS. In each figure, CL1 indicates the rotation axis of the crankshaft 8, CL2 indicates the rotation axis of the camshaft 13, and CL3 indicates the rotation axis of the tappet roller 51 of the supply pump 50.
図1及び図2に示すように、本実施形態に係る燃料ポンプ組付構造は、例えば、コモンレール式燃料噴射システムを備えるディーゼルエンジン1(以下、単にエンジン1という。)のサプライポンプ(燃料ポンプ)50の組付構造に適用される。コモンレール式燃料噴射システムでは、燃料タンク2内の燃料をフィードポンプ3によってサプライポンプ50側へ供給し、サプライポンプ50によって燃料を加圧してコモンレール4へ供給し、サプライポンプ50によって加圧された高圧の燃料をコモンレール4に貯留し、コモンレール4に貯留された高圧の燃料を複数(本実施形態では、4つ)のインジェクタ5からエンジン1の複数(本実施形態では、4つ)の燃焼室6へ噴射する。インジェクタ5から燃焼室6へ噴射された燃料は、燃焼室6内でピストン7によって圧縮された高温の空気によって着火して燃焼し、この燃焼によって膨張したガスが、ピストン7を押し下げてエンジン1のクランクシャフト8を回転させる。なお、図2には、1つの燃焼室6のみが図示されている。
As shown in FIGS. 1 and 2, the fuel pump assembly structure according to the present embodiment includes, for example, a supply pump (fuel pump) of a diesel engine 1 (hereinafter simply referred to as the engine 1) having a common rail fuel injection system. Applies to 50 assembly structures. In the common rail fuel injection system, the fuel in the fuel tank 2 is supplied to the supply pump 50 side by the feed pump 3, the fuel is pressurized by the supply pump 50 and supplied to the common rail 4, and the high pressure pressurized by the supply pump 50 is supplied. Are stored in the common rail 4, and a plurality (four in this embodiment) of the high-pressure fuel stored in the common rail 4 to a plurality of (four in the present embodiment) combustion chambers 6 of the engine 1. To spray. The fuel injected from the injector 5 into the combustion chamber 6 is ignited and burned by the high-temperature air compressed by the piston 7 in the combustion chamber 6, and the gas expanded by this combustion pushes down the piston 7 to The crankshaft 8 is rotated. In FIG. 2, only one combustion chamber 6 is shown.
エンジン1は、燃焼室6への吸気を制御する吸気弁11、燃焼室6からの排気を制御する排気弁12、フィードポンプ3、及びサプライポンプ50を駆動するためのカムシャフト13を有する。エンジン1のシリンダブロック1aは、カムシャフト13を回転自在に支持する。シリンダブロック1aの内部には、カムシャフト13を収容するシャフト収容空間21(図3参照)が形成されている。すなわち、シリンダブロック1aの一部は、シャフト収容空間21を形成するカムシャフトハウジング20(図3参照)として機能する。吸気弁11及び排気弁12は、アーム15を介してプッシュロッド16に連結され、カムシャフト13の回転によって駆動される。なお、図2では、吸気弁11側のアーム15及びプッシュロッド16を図示し、排気弁12側のアーム15及びプッシュロッド16の図示を省略している。
The engine 1 has an intake valve 11 that controls intake air to the combustion chamber 6, an exhaust valve 12 that controls exhaust gas from the combustion chamber 6, a feed pump 3, and a camshaft 13 for driving a supply pump 50. The cylinder block 1a of the engine 1 supports the camshaft 13 rotatably. A shaft housing space 21 (see FIG. 3) for housing the camshaft 13 is formed inside the cylinder block 1a. That is, a part of the cylinder block 1a functions as a camshaft housing 20 (see FIG. 3) that forms the shaft housing space 21. The intake valve 11 and the exhaust valve 12 are connected to the push rod 16 via the arm 15 and are driven by the rotation of the camshaft 13. In FIG. 2, the arm 15 and the push rod 16 on the intake valve 11 side are shown, and the illustration of the arm 15 and the push rod 16 on the exhaust valve 12 side is omitted.
図1~図3に示すように、カムシャフト13は、棒状部材であって、複数のカムを一体的に有し、エンジン1のシリンダブロック1aに回転自在に支持される。複数のカムには、複数の吸気弁駆動カム17と、複数の排気弁駆動カム18(図3には、1つの排気弁駆動カム18のみが図示されている。)と、フィードポンプ駆動カム19と、サプライポンプ駆動カム(カム)14とが含まれる。カムシャフト13は、カムシャフト13の軸方向(延設方向)に延びる回転軸CL2を有し、カムシャフト13の回転軸CL2がクランクシャフト8の回転軸CL1と略平行になるように配置される。カムシャフト13の一端側の端部には、入力ギア9が固定的に設けられる。カムシャフト13の入力ギア9は、クランクシャフト8に対してギアまたはチェーン等を介して連結される。この連結によって、カムシャフト13の入力ギア9には、カムシャフト13を回転させるための力がクランクシャフト8から入力し、カムシャフト13は、クランクシャフト8の回転に伴って回転する。吸気弁駆動カム17には、吸気弁11側のプッシュロッド16の先端が当接し、排気弁駆動カム18には、排気弁12側のプッシュロッド16の先端が当接し、フィードポンプ駆動カム19には、フィードポンプ3のタペットローラ(図示省略)が当接し、サプライポンプ駆動カム14には、サプライポンプ50の後述するタペットローラ(ローラ)51が当接する。吸気弁駆動カム17は吸気弁11を駆動し、排気弁駆動カム18は排気弁12を駆動し、フィードポンプ駆動カム19はフィードポンプ3を駆動し、サプライポンプ駆動カム14はサプライポンプ50を駆動する。
As shown in FIGS. 1 to 3, the camshaft 13 is a rod-shaped member, and integrally includes a plurality of cams, and is rotatably supported by the cylinder block 1a of the engine 1. The plurality of cams include a plurality of intake valve drive cams 17, a plurality of exhaust valve drive cams 18 (only one exhaust valve drive cam 18 is shown in FIG. 3), and a feed pump drive cam 19. And a supply pump drive cam (cam) 14. The camshaft 13 has a rotation axis CL2 extending in the axial direction (extending direction) of the camshaft 13, and is arranged so that the rotation axis CL2 of the camshaft 13 is substantially parallel to the rotation axis CL1 of the crankshaft 8. . An input gear 9 is fixedly provided at an end portion on one end side of the camshaft 13. The input gear 9 of the camshaft 13 is connected to the crankshaft 8 via a gear or a chain. By this connection, a force for rotating the camshaft 13 is input from the crankshaft 8 to the input gear 9 of the camshaft 13, and the camshaft 13 rotates as the crankshaft 8 rotates. The tip of the push rod 16 on the intake valve 11 side is in contact with the intake valve drive cam 17, and the tip of the push rod 16 on the exhaust valve 12 side is in contact with the exhaust valve drive cam 18. The tappet roller (not shown) of the feed pump 3 comes into contact with the supply pump drive cam 14, and a tappet roller (roller) 51, which will be described later, of the supply pump 50 comes into contact. The intake valve drive cam 17 drives the intake valve 11, the exhaust valve drive cam 18 drives the exhaust valve 12, the feed pump drive cam 19 drives the feed pump 3, and the supply pump drive cam 14 drives the supply pump 50. To do.
図3に示すように、本実施形態に係る燃料ポンプ組付構造は、エンジン1のカムシャフトハウジング20とアダプタ30とサプライポンプ50とを備える。
As shown in FIG. 3, the fuel pump assembly structure according to the present embodiment includes a camshaft housing 20, an adapter 30, and a supply pump 50 of the engine 1.
カムシャフトハウジング20は、上下方向(所定方向)に沿って貫通するアダプタ挿入孔22を有し、シャフト収容空間21を形成する。アダプタ挿入孔22は、シャフト収容空間21とカムシャフトハウジング20の外部とを連通する。アダプタ挿入孔22は、カムシャフト13の回転軸CL2と交叉する方向に延びる。アダプタ挿入孔22のシャフト収容空間21側の開口23(以下、内部開口23という。)は、シャフト収容空間21に収容されたカムシャフト13のサプライポンプ駆動カム14から上方に離間した位置に配置され、サプライポンプ駆動カム14に向かって開口する。
The camshaft housing 20 has an adapter insertion hole 22 penetrating along the vertical direction (predetermined direction), and forms a shaft housing space 21. The adapter insertion hole 22 communicates the shaft housing space 21 with the outside of the camshaft housing 20. The adapter insertion hole 22 extends in a direction crossing the rotation axis CL2 of the camshaft 13. An opening 23 on the shaft housing space 21 side of the adapter insertion hole 22 (hereinafter referred to as an internal opening 23) is disposed at a position spaced upward from the supply pump drive cam 14 of the camshaft 13 housed in the shaft housing space 21. , Opening toward the supply pump drive cam 14.
図3及び図4に示すように、アダプタ30は、上下方向に延びる筒状のシリンダ部31と、シリンダ部31の上端部から径方向外側へ拡がる鍔状のフランジ部32と、シリンダ部31に固定されるピン37とを有し、カムシャフトハウジング20に対して固定される。
As shown in FIGS. 3 and 4, the adapter 30 includes a cylindrical cylinder portion 31 that extends in the vertical direction, a flange-like flange portion 32 that extends radially outward from the upper end portion of the cylinder portion 31, and the cylinder portion 31. The pin 37 is fixed to the camshaft housing 20.
シリンダ部31は、カムシャフトハウジング20のアダプタ挿入孔22に上方から挿入される。シリンダ部31がカムシャフトハウジング20のアダプタ挿入孔22に上方から挿入された状態で、フランジ部32は、カムシャフトハウジング20の外部に配置され、アダプタ挿入孔22の周囲のカムシャフトハウジング20の上面に対して締結固定される。フランジ部32とアダプタ挿入孔22の周囲のカムシャフトハウジング20の上面との間には、ガスケット等のシール部材(図示省略)が介在する。シリンダ部31は、上端開口33と下端開口34とを連通して上下方向に直線状に延びるポンプ挿入孔35を有する。ポンプ挿入孔35の軸が延びる方向(上記所定方向)は、カムシャフト13の回転軸CL2と直交する方向である。下端開口34は、シャフト収容空間21に収容されたカムシャフト13のサプライポンプ駆動カム14から上方に離間した位置に配置され、サプライポンプ駆動カム14に向かって開口する。シリンダ部31のうちカムシャフトハウジング20のアダプタ挿入孔22に挿入される領域36には、シリンダ部31を径方向(本実施形態では、シリンダ部31の軸と直交する方向)に貫通するピン挿入孔38が形成される。ピン挿入孔38は、上面視においてカムシャフト13の回転軸CL2と直交する方向に沿って延びる。ピン挿入孔38が設けられる位置は、シリンダ部31の上記領域36のうち、サプライポンプ50の後述するタペット52が摺動する範囲に含まれる。
The cylinder part 31 is inserted into the adapter insertion hole 22 of the camshaft housing 20 from above. With the cylinder portion 31 inserted into the adapter insertion hole 22 of the camshaft housing 20 from above, the flange portion 32 is disposed outside the camshaft housing 20, and the upper surface of the camshaft housing 20 around the adapter insertion hole 22 It is fastened and fixed to. A seal member (not shown) such as a gasket is interposed between the flange portion 32 and the upper surface of the camshaft housing 20 around the adapter insertion hole 22. The cylinder portion 31 has a pump insertion hole 35 that communicates the upper end opening 33 and the lower end opening 34 and extends linearly in the vertical direction. The direction in which the axis of the pump insertion hole 35 extends (the predetermined direction) is a direction orthogonal to the rotation axis CL2 of the camshaft 13. The lower end opening 34 is disposed at a position spaced upward from the supply pump drive cam 14 of the camshaft 13 accommodated in the shaft accommodation space 21 and opens toward the supply pump drive cam 14. In a region 36 of the cylinder portion 31 that is inserted into the adapter insertion hole 22 of the camshaft housing 20, a pin is inserted that penetrates the cylinder portion 31 in the radial direction (in the present embodiment, the direction orthogonal to the axis of the cylinder portion 31). A hole 38 is formed. The pin insertion hole 38 extends along a direction orthogonal to the rotation axis CL2 of the camshaft 13 in a top view. The position where the pin insertion hole 38 is provided is included in a range in which the later-described tappet 52 of the supply pump 50 slides in the region 36 of the cylinder portion 31.
ピン37は、シリンダ部31のピン挿入孔38に沿って延びる棒体であって、ピン挿入孔38に圧入されてシリンダ部31に対して固定される。すなわち、ピン37は、上面視においてカムシャフト13の回転軸CL2と直交する方向に沿って延びる。ピン37がシリンダ部31に固定された状態で、シリンダ部31の径方向のピン37の外端は、シリンダ部31の外周面31aと略同一面上に配置され、シリンダ部31の径方向のピン37の内端は、シリンダ部31の内周面31bよりも径方向内側に配置される。すなわち、ピン37は、シリンダ部31に固定された状態でシリンダ部31の内周面31bよりも径方向内側に突出する突出部39(図6参照)を有する。ピン37の突出部39は、上面視においてカムシャフト13の回転軸CL2と直交する方向に沿って突出する。
The pin 37 is a rod that extends along the pin insertion hole 38 of the cylinder part 31, and is pressed into the pin insertion hole 38 and fixed to the cylinder part 31. That is, the pin 37 extends along a direction orthogonal to the rotation axis CL2 of the camshaft 13 in a top view. In a state where the pin 37 is fixed to the cylinder part 31, the outer end of the radial pin 37 of the cylinder part 31 is disposed on substantially the same surface as the outer peripheral surface 31 a of the cylinder part 31. The inner end of the pin 37 is disposed on the radially inner side with respect to the inner peripheral surface 31 b of the cylinder portion 31. That is, the pin 37 has a protruding portion 39 (see FIG. 6) that protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31 in a state of being fixed to the cylinder portion 31. The protruding portion 39 of the pin 37 protrudes along a direction orthogonal to the rotation axis CL2 of the camshaft 13 in a top view.
図3に示すように、サプライポンプ50は、ポンプ本体53とプランジャ54とタペット52とタペットローラ51とを有するピストン式ポンプであって、カムシャフト13の回転運動をタペットローラ51及びタペット52の往復運動に変換し、タペット52の往復運動によってポンプ本体53内のプランジャ54を往復運動させて、フィードポンプ3から供給される燃料をコモンレール4(図1参照)側へ供給する。サプライポンプ50は、カムシャフトハウジング20に対してアダプタ30を介して固定される。
As shown in FIG. 3, the supply pump 50 is a piston type pump having a pump main body 53, a plunger 54, a tappet 52, and a tappet roller 51, and the rotational movement of the camshaft 13 is reciprocated between the tappet roller 51 and the tappet 52. This is converted into motion, and the plunger 54 in the pump body 53 is reciprocated by the reciprocating motion of the tappet 52 to supply the fuel supplied from the feed pump 3 to the common rail 4 (see FIG. 1) side. The supply pump 50 is fixed to the camshaft housing 20 via the adapter 30.
図3及び図5に示すように、タペット52は、略円筒状に形成され、その外周面52cがアダプタ30のシリンダ部31の内周面31bに沿って摺動し、シリンダ部31内を上下に往復移動する。タペット52の摺動範囲62(往復移動する範囲)は、上死点(図5に二点鎖線で示す位置)におけるタペット52の下端52aが、下死点(図5に実線で示す位置)におけるタペット52の上端52bよりも下方に位置するように設定される。すなわち、タペット52の摺動範囲62には、タペット52の往復移動時に常にタペット52が存在する領域63(上死点におけるタペット52の下端52aと下死点におけるタペット52の上端52bとの間の領域。以下、重複領域63という。)が存在する。シリンダ部31のピン挿入孔38(図4参照)は、シリンダ部31の上記領域36(カムシャフトハウジング20のアダプタ挿入孔22に挿入される領域36)のうち、タペット52の摺動範囲62の重複領域63に含まれる高さ位置(図5に一点鎖線64で示す位置)に形成され、ピン37もタペット52の摺動範囲62の重複領域63に含まれる高さ位置(図5に一点鎖線64で示す位置)に配置される。タペット52の内径部には、該内径部を上方の領域と下方の領域とに仕切る壁部60が設けられる。
As shown in FIGS. 3 and 5, the tappet 52 is formed in a substantially cylindrical shape, and its outer peripheral surface 52 c slides along the inner peripheral surface 31 b of the cylinder portion 31 of the adapter 30, and moves up and down in the cylinder portion 31. Move back and forth. The sliding range 62 of the tappet 52 (range of reciprocating movement) is such that the lower end 52a of the tappet 52 at the top dead center (position indicated by a two-dot chain line in FIG. 5) is at the bottom dead center (position indicated by a solid line in FIG. 5). It is set to be positioned below the upper end 52b of the tappet 52. That is, the sliding range 62 of the tappet 52 has an area 63 where the tappet 52 always exists when the tappet 52 reciprocates (between the lower end 52a of the tappet 52 at the top dead center and the upper end 52b of the tappet 52 at the bottom dead center). An area (hereinafter referred to as an overlapping area 63) exists. The pin insertion hole 38 (see FIG. 4) of the cylinder part 31 is located within the sliding range 62 of the tappet 52 in the above-described area 36 of the cylinder part 31 (area 36 inserted into the adapter insertion hole 22 of the camshaft housing 20). It is formed at a height position (position indicated by a one-dot chain line 64 in FIG. 5) included in the overlapping region 63, and the pin 37 is also a height position (one-dot chain line in FIG. 5) included in the overlapping region 63 of the sliding range 62 of the tappet 52. 64). A wall portion 60 that partitions the inner diameter portion into an upper region and a lower region is provided at the inner diameter portion of the tappet 52.
図5及び図6に示すように、タペット52の外周面52cには、外周面52cから径方向内側へ凹んだ状態で上下方向に沿って直線状に延びるスライド溝部(溝部)61が形成される。スライド溝部61は、タペット52の上端52bよりも下方の所定の高さ位置から下方へ延びて、タペット52の下端52aから下方へ開放されている。スライド溝部61は、アダプタ30のピン37の突出部39の挿入を許容してピン37の突出部39と係合する大きさに形成される。スライド溝部61の幅(タペット52の周方向の長さ)は、タペット52のスライド溝部61とアダプタ30のピン37の突出部39とを係合させた際に、アダプタ30に対するタペット52の回転移動(タペット52の周方向への移動)が規制されるように、ピン37の径よりも僅かに長く設定される。スライド溝部61の長さ(上下方向の長さ)は、ピン37の径よりも長く、且つスライド溝部61にピン37の突出部39が挿入された状態で、タペット52の上死点と下死点との間での移動を許容する長さに設定される。すなわち、スライド溝部61の上端は、タペット52が下死点にある状態でピン37の高さ位置64よりも上方に位置するように設定され、スライド溝部61の下端(本実施形態では、タペット52の下端52a)は、タペット52が上死点にある状態でピン37の高さ位置64よりも下方に位置するように設定される。タペット52の内径部の壁部60よりも下方の領域には、タペットローラ51が配置される。
As shown in FIGS. 5 and 6, the outer peripheral surface 52c of the tappet 52 is formed with a slide groove portion (groove portion) 61 that extends linearly along the vertical direction while being recessed radially inward from the outer peripheral surface 52c. . The slide groove portion 61 extends downward from a predetermined height position below the upper end 52 b of the tappet 52 and is opened downward from the lower end 52 a of the tappet 52. The slide groove 61 is formed in a size that allows the protrusion 39 of the pin 37 of the adapter 30 to be inserted and engages with the protrusion 39 of the pin 37. The width of the slide groove 61 (the length in the circumferential direction of the tappet 52) is such that the tappet 52 rotates relative to the adapter 30 when the slide groove 61 of the tappet 52 and the protrusion 39 of the pin 37 of the adapter 30 are engaged. It is set slightly longer than the diameter of the pin 37 so that (the movement of the tappet 52 in the circumferential direction) is restricted. The length (vertical length) of the slide groove 61 is longer than the diameter of the pin 37, and the top dead center and bottom dead of the tappet 52 in a state where the protrusion 39 of the pin 37 is inserted into the slide groove 61. It is set to a length that allows movement between points. That is, the upper end of the slide groove 61 is set so as to be positioned above the height position 64 of the pin 37 in a state where the tappet 52 is at the bottom dead center, and the lower end of the slide groove 61 (in this embodiment, the tappet 52 The lower end 52a) of the pin 37 is set to be positioned below the height position 64 of the pin 37 in a state where the tappet 52 is at the top dead center. A tappet roller 51 is disposed in a region below the wall portion 60 of the inner diameter portion of the tappet 52.
図3に示すように、タペットローラ51は、タペット52から下方に延びる一対のローラ支持部65に、軸棒66を介して回転自在に支持される。一対のローラ支持部65は、カムシャフト13の回転軸CL2が延びる方向に離間して相対向し、軸棒66は、一対のローラ支持部65の間でカムシャフト13の回転軸CL2に沿って直線状に延びる。すなわち、軸棒66が延びる方向(タペットローラ51の回転軸CL3が延びる方向)は、カムシャフト13の回転軸CL2と略平行となり、且つスライド溝部61が凹む方向と上面視において直交するように設定される。タペットローラ51は、下方のサプライポンプ駆動カム14に向かって付勢された状態で、サプライポンプ駆動カム14に当接する。カムシャフト13の回転によってサプライポンプ駆動カム14が回転すると、タペットローラ51が回転軸CL3を中心として回転しつつ、タペットローラ51、タペット52及びプランジャ54が上下方向に沿って往復運動し、プランジャ54がポンプ本体53のポンプ室で燃料を加圧してコモンレール4側へ供給する。すなわち、サプライポンプ50は、カムシャフト13の回転運動を、タペット52の往復運動に変換し、タペット52の往復運動を利用してプランジャ54を往復運動させて、燃料を加圧してコモンレール4へ供給する。なお、サプライポンプ50のタペット52の外周面52cやタペットローラ51には、図示しないオイル流路からオイルが供給される。
As shown in FIG. 3, the tappet roller 51 is rotatably supported by a pair of roller support portions 65 extending downward from the tappet 52 via a shaft bar 66. The pair of roller support portions 65 are opposed to each other in the direction in which the rotation axis CL2 of the camshaft 13 extends, and the shaft rod 66 is located between the pair of roller support portions 65 along the rotation axis CL2 of the camshaft 13. Extends linearly. That is, the direction in which the shaft bar 66 extends (the direction in which the rotation axis CL3 of the tappet roller 51 extends) is set to be substantially parallel to the rotation axis CL2 of the camshaft 13 and orthogonal to the direction in which the slide groove 61 is recessed. Is done. The tappet roller 51 abuts on the supply pump drive cam 14 while being biased toward the lower supply pump drive cam 14. When the supply pump drive cam 14 is rotated by the rotation of the camshaft 13, the tappet roller 51 rotates around the rotation axis CL3, and the tappet roller 51, the tappet 52, and the plunger 54 reciprocate along the vertical direction. Pressurizes the fuel in the pump chamber of the pump body 53 and supplies it to the common rail 4 side. That is, the supply pump 50 converts the rotational motion of the camshaft 13 into the reciprocating motion of the tappet 52, reciprocates the plunger 54 using the reciprocating motion of the tappet 52, pressurizes the fuel, and supplies the fuel to the common rail 4. To do. Oil is supplied to the outer peripheral surface 52c of the tappet 52 and the tappet roller 51 of the supply pump 50 from an oil passage (not shown).
サプライポンプ50をエンジン1に対して組み付ける際には、先ず、タペットローラ51を支持した状態のタペット52を、アダプタ30のポンプ挿入孔35に上方から挿入し、タペット52のスライド溝部61の下端からアダプタ30のピン37を挿入して係合させる。次に、プランジャ54をアダプタ30のポンプ挿入孔35に上方から挿入してポンプ本体53のフランジ部53aをアダプタ30に締結固定し、サプライポンプ50とアダプタ30とをユニット化する。最後に、サプライポンプ50とユニット化されたアダプタ30のシリンダ部31を、エンジン1のカムシャフトハウジング20のアダプタ挿入孔22に上方から挿入し、アダプタ30のフランジ部32を、カムシャフトハウジング20に対して締結固定する。なお、エンジン1に対するサプライポンプ50の組付方法は、上記に限定されるものではなく、例えば、先ず、アダプタ30をカムシャフトハウジング20に対して締結固定し、その後、アダプタ30に対してサプライポンプ50を固定する方法であってもよい。
When the supply pump 50 is assembled to the engine 1, first, the tappet 52 supporting the tappet roller 51 is first inserted into the pump insertion hole 35 of the adapter 30 from above and from the lower end of the slide groove 61 of the tappet 52. The pin 37 of the adapter 30 is inserted and engaged. Next, the plunger 54 is inserted into the pump insertion hole 35 of the adapter 30 from above, and the flange portion 53a of the pump main body 53 is fastened and fixed to the adapter 30 so that the supply pump 50 and the adapter 30 are unitized. Finally, the cylinder portion 31 of the adapter 30 unitized with the supply pump 50 is inserted into the adapter insertion hole 22 of the camshaft housing 20 of the engine 1 from above, and the flange portion 32 of the adapter 30 is inserted into the camshaft housing 20. Fasten and fix against. The method for assembling the supply pump 50 to the engine 1 is not limited to the above. For example, first, the adapter 30 is fastened and fixed to the camshaft housing 20, and then the supply pump is fixed to the adapter 30. The method of fixing 50 may be used.
上記のように構成された燃料ポンプ組付構造では、アダプタ30のピン37の突出部39が、シリンダ部31の内周面31bから径方向内側に突出し、サプライポンプ50のタペット52の外周面52cに形成されたスライド溝部61と係合する。そして、タペットローラ51の回転軸CL3が延びる方向は、カムシャフト13の回転軸CL2と略平行に設定される。すなわち、アダプタ30側の突出部39とサプライポンプ50の側のスライド溝部61とが係合した状態で、タペットローラ51の回転軸CL3の方向が所望の方向(本実施形態では、カムシャフト13の回転軸CL2と略平行となる方向)になるように、アダプタ30側の突出部39とサプライポンプ50の側のスライド溝部61とが配置されている。このため、サプライポンプ50をアダプタ30に取り付ける際に、タペット52のスライド溝部61とアダプタ30のピン37とを係合させることによって、カムシャフト13の回転軸CL2とサプライポンプ50のタペットローラ51の回転軸CL3とを、互いに略平行になるように容易に位置決めすることができる。
In the fuel pump assembly structure configured as described above, the protruding portion 39 of the pin 37 of the adapter 30 protrudes radially inward from the inner peripheral surface 31b of the cylinder portion 31, and the outer peripheral surface 52c of the tappet 52 of the supply pump 50. It engages with the slide groove 61 formed in the. The direction in which the rotation axis CL3 of the tappet roller 51 extends is set substantially parallel to the rotation axis CL2 of the camshaft 13. That is, with the protrusion 39 on the adapter 30 side and the slide groove 61 on the supply pump 50 side engaged, the direction of the rotation axis CL3 of the tappet roller 51 is the desired direction (in this embodiment, the camshaft 13 A protrusion 39 on the adapter 30 side and a slide groove 61 on the supply pump 50 side are arranged so as to be in a direction substantially parallel to the rotation axis CL2. Therefore, when the supply pump 50 is attached to the adapter 30, the rotation groove CL 2 of the camshaft 13 and the tappet roller 51 of the supply pump 50 are engaged by engaging the slide groove 61 of the tappet 52 and the pin 37 of the adapter 30. The rotation axis CL3 can be easily positioned so as to be substantially parallel to each other.
また、タペット52のスライド溝部61とアダプタ30のピン37の突出部39との係合は、アダプタ30に対するタペット52の回転移動(タペット52の周方向(スライド溝部61と交叉する方向)への移動)を規制する。このため、カムシャフト13の回転軸CL2とサプライポンプ50のタペットローラ51の回転軸CL3との略平行な位置関係が、サプライポンプ50の駆動時(タペット52の往復移動時に)に回転方向に変化して略平行ではなくなってしまうことを防止することができ、サプライポンプ駆動カム14とタペットローラ51との焼け付き等を防止することができる。
Further, the engagement between the slide groove portion 61 of the tappet 52 and the protruding portion 39 of the pin 37 of the adapter 30 is the rotational movement of the tappet 52 relative to the adapter 30 (movement of the tappet 52 in the circumferential direction (direction intersecting the slide groove portion 61)). ). Therefore, the substantially parallel positional relationship between the rotation axis CL2 of the camshaft 13 and the rotation axis CL3 of the tappet roller 51 of the supply pump 50 changes in the rotation direction when the supply pump 50 is driven (when the tappet 52 reciprocates). Thus, it can be prevented that the supply pump drive cam 14 and the tappet roller 51 are burned.
また、アダプタ30のピン37の突出部39は、シリンダ部31のうちカムシャフトハウジング20のアダプタ挿入孔22に挿入される領域36に配置される。このため、仮に、アダプタ30のピン挿入孔38からシリンダ部31の外部へオイルが流出したとしても、オイルがエンジン1の外部(カムシャフトハウジング20の外部)へ流出せず、オイルをカムシャフトハウジング20内に留めることができ、カムシャフトハウジング20の外部へのオイルの流出を防止することができる。
Further, the protruding portion 39 of the pin 37 of the adapter 30 is disposed in a region 36 of the cylinder portion 31 that is inserted into the adapter insertion hole 22 of the camshaft housing 20. For this reason, even if oil flows out from the pin insertion hole 38 of the adapter 30 to the outside of the cylinder portion 31, the oil does not flow out of the engine 1 (outside of the camshaft housing 20), and the oil flows to the camshaft housing. 20 can be retained within the camshaft housing 20 to prevent the oil from flowing out of the camshaft housing 20.
また、カムシャフトハウジング20とサプライポンプ50との間にアダプタ30を設け、アダプタ30のシリンダ部31の内周面31bがタペット52を摺動自在に支持するので、仮にタペット52の摺動によってシリンダ部31の内周面31bが損傷したとしても、アダプタ30を交換することによって対処することができ、サプライポンプ50をカムシャフトハウジング20に直接取り付ける場合とは異なり、カムシャフトハウジング20を交換する必要が無い。
Further, the adapter 30 is provided between the camshaft housing 20 and the supply pump 50, and the inner peripheral surface 31b of the cylinder portion 31 of the adapter 30 supports the tappet 52 in a slidable manner. Even if the inner peripheral surface 31b of the portion 31 is damaged, it can be dealt with by replacing the adapter 30, and it is necessary to replace the camshaft housing 20, unlike the case where the supply pump 50 is directly attached to the camshaft housing 20. There is no.
なお、本実施形態では、エンジン1のシリンダブロック1aの一部をカムシャフトハウジング20として機能させたが、カムシャフトハウジング20はこれに限定されるものではなく、例えば、エンジン1のシリンダヘッドの内部にカムシャフト13を配置し、エンジン1のシリンダヘッドの一部をカムシャフトハウジング20として機能させてもよい。
In the present embodiment, a part of the cylinder block 1a of the engine 1 is made to function as the camshaft housing 20, but the camshaft housing 20 is not limited to this, for example, the inside of the cylinder head of the engine 1 Alternatively, the camshaft 13 may be arranged so that a part of the cylinder head of the engine 1 functions as the camshaft housing 20.
また、本実施形態では、カムシャフトハウジング20のアダプタ挿入孔22やアダプタ30のポンプ挿入孔35等が延びる方向(上記所定方向)を上下方向としたが、上記所定方向はこれに限定されるものではなく、カムシャフト13の回転軸CL2に直交する方向であれば、他の方向であってもよい。
In the present embodiment, the direction in which the adapter insertion hole 22 of the camshaft housing 20 and the pump insertion hole 35 of the adapter 30 extend (the predetermined direction) is the vertical direction, but the predetermined direction is limited to this. Instead, any other direction may be used as long as the direction is orthogonal to the rotation axis CL2 of the camshaft 13.
また、本実施形態では、複数のカム(複数の吸気弁駆動カム17、複数の排気弁駆動カム18、フィードポンプ駆動カム19、及びサプライポンプ駆動カム14)を有するカムシャフト13を設けたが、カムシャフト13はこれに限定されるものではなく、少なくともサプライポンプ駆動カム(カム)14を有するカムシャフト13であればよい。
In the present embodiment, the camshaft 13 having a plurality of cams (a plurality of intake valve drive cams 17, a plurality of exhaust valve drive cams 18, a feed pump drive cam 19, and a supply pump drive cam 14) is provided. The camshaft 13 is not limited to this, and any camshaft 13 having at least a supply pump drive cam (cam) 14 may be used.
また、本実施形態では、アダプタ30のシリンダ部31にピン挿入孔38を設け、ピン挿入孔38にピン37を圧入し、ピン37をシリンダ部31の内周面31bよりも径方向内側に突出させることによって、突出部39を形成したが、突出部39はこれに限定されるものではない。例えば、シリンダ部31にボルト挿入孔を設け、該ボルト挿入孔に外部からボルトを螺合し、ボルトの先端側をシリンダ部31の内周面31bよりも径方向内側に突出させることによって、突出部を形成してもよい。或いは、シリンダ部31の内周面31bから径方向内側に突出する突出部を、シリンダ部31と一体成形してもよい。
Further, in the present embodiment, a pin insertion hole 38 is provided in the cylinder portion 31 of the adapter 30, the pin 37 is press-fitted into the pin insertion hole 38, and the pin 37 protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31. Although the protrusion part 39 was formed by making it, the protrusion part 39 is not limited to this. For example, a bolt insertion hole is provided in the cylinder portion 31, a bolt is screwed into the bolt insertion hole from the outside, and the tip end side of the bolt protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31. A part may be formed. Alternatively, a protruding portion that protrudes radially inward from the inner peripheral surface 31 b of the cylinder portion 31 may be integrally formed with the cylinder portion 31.
また、本実施形態では、ピン37の突出部39が、上面視においてカムシャフト13の回転軸CL2と直交する方向に突出する。このように、本実施形態では、シリンダ部31のうち、上面視においてカムシャフト13の回転軸CL2と直交する仮想線と交叉する部分に突出部39を設けたが、突出部39を設ける位置はこれに限定されるものではなく、シリンダ部31の周方向の任意の位置に突出部39を設けることができる。また、ピン37の突出部39と同様に、タペット52に設けられるスライド溝部61も、タペット52の外周面52cの周方向の任意の位置に設けることができる。すなわち、アダプタ30側の突出部39とサプライポンプ50の側のスライド溝部61とが係合した状態で、タペットローラ51の回転軸CL3の方向が所望の方向(本実施形態では、カムシャフト13の回転軸CL2と略平行となる方向)になるように、アダプタ30側の突出部39とサプライポンプ50の側のスライド溝部61とを配置することができる。
In the present embodiment, the protruding portion 39 of the pin 37 protrudes in a direction orthogonal to the rotation axis CL2 of the camshaft 13 when viewed from above. As described above, in the present embodiment, the protruding portion 39 is provided at the portion of the cylinder portion 31 that intersects the imaginary line orthogonal to the rotation axis CL2 of the camshaft 13 in the top view, but the position where the protruding portion 39 is provided is It is not limited to this, The protrusion part 39 can be provided in the arbitrary positions of the circumferential direction of the cylinder part 31. FIG. Similarly to the protruding portion 39 of the pin 37, the slide groove portion 61 provided in the tappet 52 can also be provided at an arbitrary position in the circumferential direction of the outer peripheral surface 52 c of the tappet 52. That is, with the protrusion 39 on the adapter 30 side and the slide groove 61 on the supply pump 50 side engaged, the direction of the rotation axis CL3 of the tappet roller 51 is the desired direction (in this embodiment, the camshaft 13 The protruding portion 39 on the adapter 30 side and the slide groove portion 61 on the supply pump 50 side can be arranged so as to be in a direction substantially parallel to the rotation axis CL2.
また、本実施形態では、スライド溝部61の下側を、タペット52の下端52aから下方へ開放したが、これに限定されるものではなく、スライド溝部61は、アダプタ30側のピン37の突出部39が挿入されて互いに係合した状態で、アダプタ30に対するタペット52の上下方向の往復移動を許容する長さを有していればよい。
In the present embodiment, the lower side of the slide groove 61 is opened downward from the lower end 52a of the tappet 52. However, the present invention is not limited to this, and the slide groove 61 is a protrusion of the pin 37 on the adapter 30 side. What is necessary is just to have the length which accept | permits the reciprocation of the up-down direction of the tappet 52 with respect to the adapter 30 in the state which 39 was inserted and mutually engaged.
また、本実施形態では、本開示に係る燃料ポンプ組付構造を、高圧燃料ポンプであるサプライポンプ50の組付構造に適用したが、これに限定されるものではなく、例えば、フィードポンプ3の組付構造に適用してもよい。
In the present embodiment, the fuel pump assembly structure according to the present disclosure is applied to the assembly structure of the supply pump 50 that is a high-pressure fuel pump. However, the present invention is not limited to this. You may apply to an assembly structure.
以上、本開示について、上記実施形態に基づいて説明を行ったが、本開示は上記実施形態の内容に限定されるものではなく、当然に本開示を逸脱しない範囲で適宜変更が可能である。すなわち、この実施形態に基づいて当業者等によりなされる他の実施形態、実施例及び運用技術等は全て本開示の範疇に含まれることは勿論である。
As mentioned above, although this indication was demonstrated based on the said embodiment, this indication is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this indication. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present disclosure.
例えば、上記実施形態では、本開示に係る燃料ポンプ組付構造を、ディーゼルエンジン1に適用したが、ガソリンエンジンに適用してもよい。また、コモンレール式燃料噴射システムを備えないエンジンに適用してもよい。
For example, in the above embodiment, the fuel pump assembly structure according to the present disclosure is applied to the diesel engine 1, but may be applied to a gasoline engine. Further, the present invention may be applied to an engine that does not include a common rail fuel injection system.
本出願は、2018年1月31日付で出願された日本国特許出願(特願2018-015894)に基づくものであり、その内容はここに参照として取り込まれる。
This application is based on a Japanese patent application (Japanese Patent Application No. 2018-015894) filed on January 31, 2018, the contents of which are incorporated herein by reference.
本開示の燃料ポンプ組付構造は、タペットの回転を防止しつつオイル漏れを防止するといった点において有用である。
The fuel pump assembly structure of the present disclosure is useful in terms of preventing oil leakage while preventing rotation of the tappet.
1 エンジン
13 カムシャフト
14 サプライポンプ駆動カム(カム)
20 カムシャフトハウジング
22 アダプタ挿入孔
23 内部開口
30 アダプタ
31 シリンダ部
31b シリンダ部の内周面
36 領域(シリンダ部の一部の領域)
50 サプライポンプ(燃料ポンプ)
51 タペットローラ(ローラ)
52 タペット
52c タペットの外周面
61 スライド溝部(溝部) 1Engine 13 Camshaft 14 Supply pump drive cam (cam)
20Camshaft housing 22 Adapter insertion hole 23 Internal opening 30 Adapter 31 Cylinder part 31b Inner peripheral surface 36 area | region of cylinder part (partial area | region of a cylinder part)
50 Supply pump (fuel pump)
51 Tappet roller (roller)
52Tappet 52c Tappet outer peripheral surface 61 Slide groove (groove)
13 カムシャフト
14 サプライポンプ駆動カム(カム)
20 カムシャフトハウジング
22 アダプタ挿入孔
23 内部開口
30 アダプタ
31 シリンダ部
31b シリンダ部の内周面
36 領域(シリンダ部の一部の領域)
50 サプライポンプ(燃料ポンプ)
51 タペットローラ(ローラ)
52 タペット
52c タペットの外周面
61 スライド溝部(溝部) 1
20
50 Supply pump (fuel pump)
51 Tappet roller (roller)
52
Claims (2)
- エンジンのカムシャフトのカムに向かって開口する内部開口から外部へ向かって所定方向に沿って延びるアダプタ挿入孔を有し、内部に前記カムシャフトを収容するカムシャフトハウジングと、
前記所定方向に沿って延びて少なくとも一部の領域が前記カムシャフトハウジングの前記アダプタ挿入孔に挿入される筒状のシリンダ部と、前記シリンダ部のうち前記アダプタ挿入孔に挿入された領域に配置されて、前記シリンダ部の内周面から径方向内側へ突出する突出部とを有し、前記カムシャフトハウジングに対して固定されるアダプタと、
前記カムシャフトの前記カムに当接するローラを支持した状態で前記アダプタの前記シリンダ部の内周面に前記所定方向に摺動自在に支持されるタペットを有し、前記カムの回転運動を前記所定方向に沿った前記タペットの往復運動に変換し、前記タペットの往復運動を利用して燃料を前記エンジン側へ供給する燃料ポンプと、を備え、
前記タペットの外周面には、前記所定方向に沿って直線状に延び、前記アダプタの前記突出部の挿入を許容して前記突出部と係合する溝部が形成され、
前記アダプタの前記突出部と前記タペットの前記溝部との係合は、前記所定方向に沿った前記タペットの往復移動を許容し、且つ前記溝部と交叉する方向への前記タペットの回転移動を規制する
ことを特徴とする燃料ポンプ組付構造。 A camshaft housing having an adapter insertion hole extending in a predetermined direction from an internal opening that opens toward a cam of an engine camshaft to the outside, and housing the camshaft therein;
A cylindrical cylinder part extending along the predetermined direction and having at least a part of the area inserted into the adapter insertion hole of the camshaft housing, and an area of the cylinder part inserted into the adapter insertion hole. And an adapter that protrudes radially inward from the inner peripheral surface of the cylinder portion, and is fixed to the camshaft housing;
A tappet that is slidably supported in the predetermined direction on the inner peripheral surface of the cylinder portion of the adapter in a state where a roller that contacts the cam of the cam shaft is supported; A fuel pump that converts the reciprocating motion of the tappet along a direction and supplies fuel to the engine side using the reciprocating motion of the tappet,
On the outer peripheral surface of the tappet, a groove that extends linearly along the predetermined direction and that engages with the protrusion while allowing insertion of the protrusion of the adapter is formed.
The engagement between the protruding portion of the adapter and the groove portion of the tappet allows the tappet to reciprocate along the predetermined direction and restricts the rotational movement of the tappet in a direction crossing the groove portion. A fuel pump assembly structure characterized by that. - 請求項1に記載の燃料ポンプ組付構造であって、
前記アダプタは、前記カムシャフトハウジングと前記燃料ポンプとの間に交換可能に設けられた
ことを特徴とする燃料ポンプ組付構造。 The fuel pump assembly structure according to claim 1,
The fuel pump assembling structure, wherein the adapter is replaceably provided between the camshaft housing and the fuel pump.
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JP2018015894A JP7022380B2 (en) | 2018-01-31 | 2018-01-31 | Fuel pump assembly structure |
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GB2617853A (en) * | 2022-04-21 | 2023-10-25 | Delphi Tech Ip Ltd | Drive assembly for a fuel pump with roller tappet |
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JP5459329B2 (en) * | 2012-01-31 | 2014-04-02 | 株式会社デンソー | Supply pump |
DE102013201335A1 (en) * | 2013-01-29 | 2014-07-31 | Schaeffler Technologies Gmbh & Co. Kg | tappet |
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JPS63272959A (en) * | 1987-04-30 | 1988-11-10 | ゲブリユーター ズルツアー アクチエンゲゼルシヤフト | Fuel injection pump for reciprocating diesel engine |
JPH03294653A (en) * | 1990-04-12 | 1991-12-25 | Nippondenso Co Ltd | Fuel injection pump |
JPH06159192A (en) * | 1992-08-22 | 1994-06-07 | Robert Bosch Gmbh | Fuel injection pump used for internal combustion engine |
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GB2617853A (en) * | 2022-04-21 | 2023-10-25 | Delphi Tech Ip Ltd | Drive assembly for a fuel pump with roller tappet |
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CN111655999A (en) | 2020-09-11 |
JP2019132211A (en) | 2019-08-08 |
JP7022380B2 (en) | 2022-02-18 |
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