JP2017115825A - Supply pump fixing structure for cylinder block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supply pump fixing structure capable of assembling a supply pump to a cylinder block in compact.SOLUTION: An adapter member 40 is kept to be inserted into an adapter insertion hole 31 formed at a supply pump fixing part 15 of a cylinder block 10. The adapter member 40 has: a first flange 41 contacted with an adapter fixing surface 30 of the supply pump fixing part 15; a second flange 42 supporting the supply pump; a pump insertion hole 45 into which a pump mechanism part such as a tappet or the like of the supply pump is inserted; a rotation stop insertion hole 47 into which an extremity end 46a of a rotation stopper member 46 is inserted; an oil supply communicating hole 48; and an air releasing part 50. An oil supply hole 35 is formed at the supply pump fixing part 15. The oil supply hole 35 is communicated with an oil supply flow passage 36 in the cylinder block 10. The oil supply hole 35 is formed from a position of an opening part of the adapter insertion hole 31 along a straight line passing through an opening at a position where it can be adjacent to an inner surface 31b of the adapter insertion hole 31.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a supply pump mounting structure for attaching a supply pump to a cylinder block of an engine.

  For example, an engine having a fuel injection system including an injector such as a diesel engine is configured to pressurize the fuel by a supply pump driven in conjunction with the rotation of the crankshaft of the engine and supply the fuel to the cylinder head injector. Yes. The supply pump is fixed to the cylinder block.

  For example, as described in Patent Document 1 or Patent Document 2, a conventional supply pump includes a cylinder body, a tappet that reciprocates in the axial direction of the cylinder body, and an axial direction of the cylinder body in conjunction with the tappet. It includes a plunger that reciprocates and pressurizes fuel, an electromagnetic valve that includes a valve body that opens and closes in synchronization with the plunger, and a drive unit that transmits engine rotation to the tappet. The drive unit includes a pump housing coupled to the cylinder body, a cam accommodated in the pump housing, a rotation mechanism that transmits the rotation of the engine to the cam, and the like.

JP-A 64-73166 JP 2008-88841 A

  A conventional supply pump includes a drive unit in addition to a pump body including a cylinder body, a tappet, a plunger, a solenoid valve, and the like. The drive unit includes a pump housing, a cam housed in the pump housing, a rotation mechanism that transmits the rotation of the engine to the cam, and the like. Such a drive unit, although part of the supply pump, occupies a considerable volume of the supply pump.

  In addition, in a conventional engine using a supply pump, a power transmission system for transmitting the rotation of the crankshaft to the rotation mechanism of the supply pump needs to be arranged on the cylinder block side. For this reason, when the supply pump is assembled to the cylinder block, the amount of protrusion of the supply pump tends to be relatively large. Some supply pumps may require a piping system for passing oil between the oil supply flow path in the cylinder block and the supply pump in order to lubricate the sliding portion of the tappet.

  Accordingly, an object of the present invention is to provide a supply pump mounting structure that allows a supply pump to be compactly assembled to a cylinder block.

  A supply pump mounting structure according to one embodiment includes an adapter mounting surface formed in a supply pump mounting portion of a cylinder block having an oil supply flow path, and communicates with an internal space of the cylinder block formed in the supply pump mounting portion. And an adapter insertion hole having an opening in the adapter mounting surface, and the oil supply from the inner surface formed along a straight line passing through the opening at a position where the inner surface of the adapter insertion hole can be faced from the opening. And an oil supply hole reaching the flow path.

  In this embodiment, the adapter member further includes an adapter member inserted into the adapter insertion hole, the adapter member including a first flange that contacts the adapter mounting surface, a second flange that supports the supply pump, and the supply pump. You may provide the pump insertion hole in which a pump mechanism part is inserted, and the oil supply communication hole connected to the said oil supply hole.

  The pump mechanism portion may include a tappet, and the adapter member may include an air escape portion having a length exceeding both ends of a trajectory along which the tappet moves. The air escape portion may include a plurality of grooves formed so as to be displaced from each other in the circumferential direction of the pump insertion hole with respect to an extension line of the oil supply hole. The supply pump mounting portion has a non-rotating mounting hole for inserting the non-rotating member, and the adapter member has a non-rotating insertion hole into which the tip of the non-rotating member is inserted at a position corresponding to the non-rotating mounting hole. And the front-end | tip of the said rotation prevention member may be inserted in the guide groove of the said tappet.

  In one embodiment, it has a pump drive system that transmits the rotation of the crankshaft of the engine to the tappet of the supply pump, and the pump drive system is disposed in the internal space of the cylinder block and is connected to the cam follower of the pump mechanism section. The cam includes a cam, a crankshaft gear that rotates in conjunction with the rotation of the crankshaft, and a pump drive gear that meshes with the crankshaft gear and transmits the rotation of the crankshaft gear to the cam.

  According to the cylinder block supply pump mounting structure according to the present invention, it is possible to supply the oil supplied from the oil supply passage in the cylinder block to the supply pump from the oil supply hole that opens to the inner surface of the adapter insertion hole. The oil supply hole can be formed by a tool from the opening of the adapter insertion hole. Further, a pump drive system such as a cam for driving the supply pump is disposed in the internal space of the cylinder block, which can contribute to downsizing of the engine including the supply pump.

The perspective view of the cylinder block provided with the adapter member and supply pump which concern on 1st Embodiment. The perspective view which shows the state before attaching a supply pump to the cylinder block shown by FIG. The perspective view which shows an example of the supply pump and a pump drive system typically. Sectional drawing which shows a part of cylinder block shown by FIG. 1, an adapter member, and a supply pump. Sectional drawing of a part of cylinder block and adapter member which were shown by FIG. The perspective view of the adapter member. The bottom view of the adapter member. Sectional drawing which shows typically the example of the tool which processes the supply pump attachment part of the cylinder block shown in FIG. 1, and an oil supply hole. Sectional drawing which shows the adapter member which concerns on 2nd Embodiment.

A supply pump mounting structure for a cylinder block according to the first embodiment will be described below with reference to FIGS.
FIG. 1 shows a part of a cylinder block 10 of an engine and a supply pump 20. The supply pump 20 forms part of a fuel supply system for supplying pressurized fuel to the injector. FIG. 2 shows a state before the supply pump 20 is assembled to the cylinder block 10. FIG. 3 schematically shows the crankshaft 11, the supply pump 20, and the like.

  As shown in FIG. 1, a plurality (for example, four) of cylinder bores 12 a to 12 d are formed in the cylinder block 10 in the axial direction of the crankshaft 11. The cylinder bores 12a to 12d are opened on the upper surface of the cylinder block 10, respectively. A cylinder head is disposed on the upper surface of the cylinder block 10.

  FIG. 4 shows a part of the cylinder block 10 (supply pump mounting portion 15), the supply pump 20, and the adapter member 40. The adapter member 40 is attached to the supply pump attachment portion 15. The supply pump 20 is attached to the adapter member 40. The adapter member 40 will be described in detail later.

  The structure of the supply pump 20 is not limited to that shown in FIG. 4. As an example, the supply pump 20 includes a cylinder body 21 having a pressurizing chamber, a tappet 22 that reciprocates in the direction along the axis X 1 of the cylinder body 21, and a plunger. 23, an electromagnetic valve 24 that opens and closes the valve body in synchronization with the reciprocating motion of the plunger 23, a cam follower 25, a spring 26, a fuel introduction pipe 27, a fuel outlet pipe 28, a flange portion 29, and the like. .

  The tap mechanism 22, the plunger 23, the cam follower 25, the spring 26 and the like constitute a pump mechanism. As shown in FIG. 2, in a state before the supply pump 20 is attached to the supply pump attachment portion 15, the pump mechanism portion is exposed to the outside from the lower surface of the flange portion 29. A guide groove 22 a is formed on the side surface of the tappet 22. The guide groove 22a is formed in the direction in which the tappet 22 moves (the direction along the axis X1).

  The supply pump mounting portion 15 forms a part of the wall surface 10a of the cylinder block 10 and protrudes obliquely upward from the wall surface 10a of the cylinder block 10 in a trapezoidal shape. On the upper end side of the supply pump mounting portion 15, an adapter mounting surface 30 that is inclined so as to become lower as the distance from the wall surface 10a increases. As shown in FIG. 8, the adapter mounting surface 30 is machined flat.

  An adapter insertion hole 31 is formed in the supply pump mounting portion 15. An axis X2 (shown in FIG. 8) of the adapter insertion hole 31 extends in a direction perpendicular to the adapter mounting surface 30 and communicates with the internal space 10b inside the cylinder block 10. The adapter insertion hole 31 has a circular opening 31 a that opens in the adapter mounting surface 30. The inner surface 31b of the adapter insertion hole 31 has a cylindrical shape. The supply pump mounting portion 15 is formed with a non-rotating mounting hole 33 in a direction perpendicular to the axis X2 of the adapter insertion hole 31.

  An oil supply hole 35 is formed inside the supply pump mounting portion 15. The oil supply hole 35 is formed in a straight line from the position where the inside of the adapter insertion hole 31 can directly face through the opening 31 a of the adapter insertion hole 31 toward the oil supply flow path 36 in the cylinder block 10.

  That is, the oil supply hole 35 is formed straight along a straight line M (shown in FIG. 8) passing through the inside of the opening 31a at a position facing the inner surface 31b from the outside of the supply pump mounting portion 15 through the opening 31a. . Moreover, the oil supply hole 35 is formed obliquely at an angle θ1 with respect to the axis X2 of the adapter insertion hole 31. One end 35 a of the oil supply hole 35 is opened as an oil outlet on the inner surface 31 b of the adapter insertion hole 31. The other end 35 b of the oil supply hole 35 communicates with the oil supply flow path 36 in the cylinder block 10.

  The oil supply hole 35 has a straight line shape along the straight line M passing through the opening 31a and has an angle θ1 with respect to the axis line X2 of the adapter insertion hole 31. Therefore, as shown in FIG. By inserting the tool 38 from the opening 31a and drilling toward the oil supply channel 36, a straight oil supply hole 35 reaching the oil supply channel 36 from the inner surface 31b of the adapter insertion hole 31 can be formed. it can.

  As shown in FIGS. 4 and 5, the adapter member 40 is attached to the supply pump attachment portion 15. FIG. 6 is a perspective view of the adapter member 40, and FIG. 7 is a bottom view of the adapter member 40. The adapter member 40 is inserted into the first flange 41 that contacts the adapter mounting surface 30 of the supply pump mounting portion 15, the second flange 42 that contacts the flange portion 29 of the supply pump 20, the cylindrical portion 43, and the adapter insertion hole 31. A cylindrical tip 44, a pump insertion hole 45 formed on the inner side from the cylinder 43 to the tip 44, a detent insertion hole 47 into which the tip 46 a of the detent member 46 is inserted, and an oil supply hole 35. An oil supply communication hole 48 connected to one end (oil jet outlet) 35 a and an air escape portion 50 are provided. The outer diameter of the distal end portion 44 is set such that the distal end portion 44 can be just fitted into the adapter insertion hole 31.

  In a state where the distal end portion 44 of the adapter member 40 is inserted into the adapter insertion hole 31, the axis X3 (shown in FIG. 5) of the pump insertion hole 45 coincides with the axis X2 (shown in FIG. 8) of the adapter insertion hole 31. ing. The rotation stopper insertion hole 47 is formed at a position corresponding to the rotation stopper mounting hole 33 of the supply pump mounting portion 15.

  As shown in FIG. 4, the pump mechanism (the tappet 22, the plunger 23, the cam follower 25, the spring 26, etc.) of the supply pump 20 is inserted into the pump insertion hole 45 of the adapter member 40. A detent member 46 is inserted into the detent mounting hole 33. The distal end 46 a of the anti-rotation member 46 is inserted into the guide groove 22 a through the anti-rotation insertion hole 47. In this state, the tappet 22 is movable in the direction along the axis X3 along the guide groove 22a, and the tappet 22 is prevented from rotating around the axis X1 with respect to the adapter member 40.

  Oil sent from the oil supply flow path 36 in the cylinder block 10 through the oil supply hole 35 is supplied to the sliding surface of the tappet 22 through the oil supply communication hole 48. That is, in a state where the oil groove 22b of the tappet 22 has moved to a position facing the oil supply communication hole 48, the oil ejected from the oil supply communication hole 48 is supplied to the oil groove 22b.

  The air escape portion 50 has a function of releasing air pulsation (pressure change) generated inside the cylindrical portion 43 of the adapter member 40 by the reciprocating motion of the tappet 22. For this reason, the air escape portion 50 is formed over a length exceeding both ends of the movement stroke of the tappet 22. For example, the air escape portion 50 of the present embodiment includes a first groove 51 and a second groove 52 (shown in FIG. 7).

  The first groove 51 and the second groove 52 of the air escape portion 50 are each formed in a range exceeding both ends of the movement stroke of the tappet 22. Moreover, the first groove 51 and the second groove 52 have a predetermined angle θ2, in the circumferential direction of the pump insertion hole 45 with respect to the extension line X4 (shown in FIG. 7) of the oil supply hole 35 and the oil supply communication hole 48. The positions are shifted in the circumferential direction so as to form θ3 (for example, + 120 ° and −120 °). The lower ends of the first groove 51 and the second groove 52 respectively communicate with the crank chamber in the cylinder block 10.

  The first flange 41 and the second flange 42 of the adapter member 40 are both two-hole flanges, and each has a non-circular shape (substantially diamond shape). That is, the first flange 41 has a pair of mounting holes 60 a and 60 b formed at symmetrical positions on both sides of the cylindrical portion 43. The second flange 42 also has a pair of mounting holes 62 a and 62 b formed at symmetrical positions on both sides of the cylindrical portion 43.

  In a state in which the distal end portion 44 of the adapter member 40 is inserted into the adapter insertion hole 31, the adapter member 40 is inserted into the adapter member 40 by bolts 61 (shown in FIGS. 1 and 2) inserted into the attachment holes 60 a and 60 b of the first flange 41. Is fixed to the adapter mounting surface 30 of the supply pump mounting portion 15. A seal member 66 such as an O-ring is provided between the first flange 41 and the adapter mounting surface 30. Supply pump 20 is fixed to pump mounting surface 65 of second flange 42 by bolts 63 (one of which is shown in FIG. 1) inserted into mounting holes 62a and 62b of second flange 42, respectively.

  As shown in FIG. 7, the mounting holes 60a, 60b of the first flange 41 and the mounting holes 62a, 62b of the second flange 42 are viewed from the direction along the axis X3 (shown in FIG. 5) of the adapter member 40. The positions of each other are shifted by an angle θ4 (shown in FIG. 7). An example of θ4 is 90 °. Thus, when the adapter member 40 is fixed to the supply pump mounting portion 15 by the bolt 61 (shown in FIGS. 1 and 2) inserted into the mounting holes 60a and 60b, a tool for rotating the bolt 61 is used as the second flange. Interference with 42 can be avoided.

  As shown in FIG. 3, a pump drive gear 71 is engaged with a crankshaft gear 70 that is rotated by the crankshaft 11. A cam 72 is attached coaxially with the pump drive gear 71. The number of teeth of the crankshaft gear 70 and the number of teeth of the pump drive gear 71 are the same. Therefore, when the crankshaft 11 rotates once, the cam 72 rotates once in the direction opposite to the crankshaft gear 70. The pump drive gear 71 and the cam 72 are accommodated in the internal space 10b of the cylinder block 10 and covered with a cam case 73 (shown in FIGS. 1 and 2).

  As shown in FIG. 4, in the state where the adapter member 40 is fixed to the supply pump mounting portion 15 and the pump mechanism portion of the supply pump 20 is inserted into the adapter member 40, the cam follower 25 of the tappet 22 contacts the cam 72. When the engine is operated, the crankshaft 11 (shown in FIG. 3) rotates, and the crankshaft gear 70 rotates, whereby the pump drive gear 71 and the cam 72 rotate.

  When the cam 72 rotates, the tappet 22 of the supply pump 20 reciprocates according to the shape of the cam crest. The crankshaft gear 70, the pump drive gear 71, the cam 72, and the like constitute a pump drive system 75 for driving the supply pump 20. When the tappet 22 reciprocates, the fuel sucked into the pressurizing chamber of the cylinder body 21 from the fuel introduction pipe 27 is pressurized and supplied from the fuel lead-out pipe 28 to a fuel accumulating system such as a common rail, and each cylinder bore 12a to 12d. The fuel is injected into the combustion chamber from the fuel injection valve (injector) in a predetermined order.

  According to the supply pump mounting structure of the present embodiment, the pump drive system 75 including the pump drive gear 71 and the cam 72 is accommodated in the internal space 10 b of the cylinder block 10. That is, since a pump drive system including a cam and a rotation shaft provided in a conventional supply pump is arranged in the cylinder block 10, a transmission path for transmitting the rotation of the crankshaft to the supply pump is simplified. In addition, since the configuration of the supply pump 20 retrofitted to the cylinder block 10 is simplified and the outer shape is also reduced, the amount of protrusion of the supply pump 20 from the wall surface 10a of the cylinder block 10 is reduced, which can contribute to the downsizing of the engine.

  Further, the oil supplied from the oil supply flow path 36 in the cylinder block 10 is supplied to the tappet 22 of the supply pump 20 through the oil supply hole 35 opened in the inner surface 31 b of the adapter insertion hole 31 and the oil supply communication hole 48 of the adapter member 40. Or the like can be supplied to the sliding portion. The oil supply hole 35 can be formed by a tool 38 inserted into the opening 31 a of the adapter insertion hole 31.

  FIG. 9 shows a part of a cylinder block 10 ′ and an adapter member 40 ′ according to the second embodiment. The adapter member 40 ′ is formed with a communication hole 80 that functions as an air escape portion. The communication hole 80 communicates with a crank chamber in the cylinder block 10 ′ through a hole 81 formed in the cylinder block 10 ′. Since the other configuration is the same as that of the first embodiment (FIGS. 1 to 8), the same reference numerals are given to the portions common to both, and the description thereof is omitted.

  In practicing the present invention, the specific configuration and arrangement of the cylinder block and the supply pump, as well as the structure, shape, arrangement, etc. of each element constituting the present invention are appropriately changed according to the engine specifications. Needless to say, this can be done. Further, the supply pump mounting structure according to the present invention is not limited to a diesel engine but can be applied to a gasoline engine.

  DESCRIPTION OF SYMBOLS 10,10 '... Cylinder block, 10a ... Wall surface, 10b ... Internal space, 11 ... Crankshaft, 15 ... Supply pump attachment part, 20 ... Supply pump, 22 ... Tappet, 25 ... Cam follower, 30 ... Adapter attachment surface, 31 ... Adapter insertion hole, 31a ... opening, 31b ... inner surface, 33 ... anti-rotation mounting hole, 35 ... oil supply hole, 35a ... one end, 35b ... other end, 36 ... oil supply flow path, 38 ... tool, 40, 40 '... Adapter member 41... First flange 42. Second flange 43. Cylindrical portion 45. Pump insertion hole 46. Anti-rotation member 46 a. Tip, 47. Anti-rotation insertion hole 48. DESCRIPTION OF SYMBOLS ... Air escape part, 51 ... 1st groove | channel, 52 ... 2nd groove | channel, 70 ... Crankshaft gear, 71 ... Pump drive gear, 72 ... Cam, 75 ... Pump drive system.

Claims (6)

An adapter mounting surface formed in a supply pump mounting portion of a cylinder block having an oil supply flow path;
An adapter insertion hole formed in the supply pump mounting portion and communicating with the internal space of the cylinder block and having an opening in the adapter mounting surface;
An oil supply hole formed along a straight line passing through the opening at a position where the inner surface of the adapter insertion hole can be faced from the opening, and reaching the oil supply flow path from the inner surface;
A supply pump mounting structure for a cylinder block, comprising: An adapter member inserted into the adapter insertion hole;
The adapter member includes a first flange that contacts the adapter mounting surface, a second flange that supports the supply pump, a pump insertion hole into which the pump mechanism of the supply pump is inserted, and an oil supply communication that communicates with the oil supply hole. The cylinder block supply pump mounting structure according to claim 1, further comprising a hole. The pump mechanism includes a tappet,
3. The supply pump mounting structure for a cylinder block according to claim 2, wherein the adapter member includes an air escape portion having a length exceeding both ends of a trajectory in which the tappet moves.   4. The cylinder block according to claim 3, wherein the air escape portion includes a plurality of grooves formed so as to be displaced from each other in a circumferential direction of the pump insertion hole with respect to an extension line of the oil supply hole. Supply pump mounting structure.   The supply pump mounting portion has a non-rotating mounting hole for inserting the non-rotating member, and the adapter member has a non-rotating insertion hole into which the tip of the non-rotating member is inserted at a position corresponding to the non-rotating mounting hole. The supply pump mounting structure for a cylinder block according to claim 3 or 4, wherein a tip end of the detent member is inserted into a guide groove of the tappet.   A pump drive system for transmitting rotation of the crankshaft of the engine to the tappet of the supply pump, the pump drive system being disposed in the internal space of the cylinder block and in contact with a cam follower of the pump mechanism unit; The crankshaft gear that rotates in conjunction with the rotation of the shaft, and a pump drive gear that meshes with the crankshaft gear and transmits the rotation of the crankshaft gear to the cam. 2. A supply pump mounting structure for a cylinder block according to claim 1.

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