JP5864116B2 - Fuel supply device - Google Patents

Description

The present invention relates to a fuel supply system including a fuel pump for pumping fuel on the basis of the driving force input from the cam.

  Conventionally, as this type of fuel pump, for example, a high-pressure fuel pump described in Patent Document 1 has been proposed. As shown in FIG. 5, the high-pressure fuel pump includes a guide member 100 having a guide hole extending in a prescribed direction, and a plunger 101 that moves forward and backward in the guide hole. Further, the high-pressure fuel pump includes a bottomed cylindrical lifter 103 disposed on the cam 102 side (lower side in FIG. 5) of the plunger 101, and a biasing member that biases the plunger 101 and the lifter 103 toward the cam 102. 104 is provided.

  The cylindrical portion 103a of the lifter 103 is formed with a through-hole 103b for allowing the lubricating oil to flow into the lifter 103 from the outside and for the lubricating oil to flow out of the lifter 103 to the outside. The bottom wall 103c of the lifter 103 is provided with a reservoir 105 for storing lubricating oil. Therefore, even when sufficient lubricating oil is not supplied to the fuel pump side, such as when the engine is started, the frictional force generated between the bottom wall 103c of the lifter 103 and the plunger 101 side is It can be reduced by the lubricating oil stored in the reservoir 105.

Japanese Patent Laid-Open No. 2001-3835

  By the way, when the engine is not driven for a long period of time, the lubricating oil is sufficiently interposed between the cam 102 and the lifter 103 and between the cylindrical portion 103a of the lifter 103 and the inner surface of the guide member 100. There is a risk of not. Even if the engine is started in such a state, the lubricating oil may not be sufficiently supplied to the high-pressure fuel pump immediately after the engine is started. In particular, when the lubricating oil is at a low temperature, the viscosity of the lubricating oil is high, and there is a possibility that the lubricating oil may not be supplied to the high-pressure fuel pump until the viscosity of the lubricating oil increases.

  In such a case, the frictional force increases between the cam 102 and the lifter 103 and between the cylindrical portion 103a of the lifter 103 and the guide member 100 due to the lack of lubricating oil. As a result, the lifter 103 may be seized.

The present invention has been made in view of such circumstances. An object of the present invention is to provide a fuel supply device capable of suppressing the occurrence of seizure in the lifter after the start of engine start.

In order to achieve the above object, the invention according to claim 1 relating to a fuel supply device is configured to pump fuel based on a driving force input from a cam, and is disposed above the cam, A guide member having a guide hole extending in a direction; a plunger that moves forward and backward in the guide hole along the prescribed direction; and a lifter for transmitting a driving force from the cam to the plunger. A fuel pump, a cam that is disposed below the fuel pump and that is driven to apply a driving force to the lifter, and an injection that is disposed at a position different from the guide member and that injects lubricating oil toward the fuel pump. And the lifter includes a tubular portion and a bottom wall portion positioned at one end of the tubular portion in the prescribed direction, and the inside and outside of the lifter are communicated with the bottom wall portion. A communication hole is formed, and a facing surface facing the plunger in the bottom wall portion is inclined with respect to a road surface on which the vehicle travels, and the communication hole is in a gravitational direction on the facing surface of the bottom wall portion. The facing surface that is opened at a position different from the lowermost position and in which the communication hole is formed is more than the portion of the flat surface adjacent to the flat surface that faces the plunger that faces the plunger. The gist is that the friction between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the guide member is reduced by the oil supplied to the fuel pump by the injection portion , which is a lower portion in the direction of gravity. To do.

  According to the above configuration, the lubricating oil is stored in the lubricating oil reservoir of the lifter even after the vehicle engine is stopped. When the engine is started in this state, the lifter moves forward and backward along a specified direction based on the driving force from the cam. Then, based on the vibration accompanying the forward / backward movement of the lifter, the lubricating oil stored in the lubricating oil reservoir overflows from the lubricating oil reservoir and is dropped below the lifter through the communication hole formed in the wall. . Such lubricating oil adheres to the cam located under the lifter. As a result, the frictional force generated between the cam and the lifter is reduced by the lubricating oil dropped from the communication hole of the lifter.

  The cam rotates based on the drive of the engine. Therefore, a part of the lubricating oil adhering to the cam is blown to the fuel pump side by centrifugal force. Then, the lubricating oil enters between the lifter that moves forward and backward and the sliding contact portion that is in sliding contact with the lifter, and the frictional force generated between the lifter and the sliding contact portion is reduced by the lubricating oil. Therefore, it is possible to suppress the occurrence of seizure on the lifter after the start of the engine start.

Moreover, according to the said structure, the opposing surface of the wall part of a lifter inclines with respect to the road surface where a vehicle drive | works. Therefore, lubricating oil is stored below the lifter in the gravity direction even when the engine is stopped. That is, the lubricating oil reservoir is formed below the communication hole in the lifter without providing a projection or the like on the wall. And the lubricating oil stored in the lifter in this way is dripped out of the lifter from the communication hole provided in the wall part by the forward and backward movement along the prescribed direction of the lifter.
In addition, when the injection unit is disposed at a position away from the guide member of the fuel pump, it is difficult to supply high-viscosity lubricating oil from the injection unit to the fuel pump side. In this regard, in the present invention, even in such a case, the lubricating oil is stored in the lifter. Then, the lubricating oil in the lifter is supplied to the cam side through the communication hole based on the advance / retreat movement of the lifter. Therefore, the occurrence of seizure of the lifter due to lack of lubricating oil can be suppressed.

According to a second aspect of the present invention, there is provided the fuel pump according to the first aspect, wherein the opposed surface is arranged such that one end side in the width direction of the vehicle is positioned below in the direction of gravity than the other end side in the width direction. The main point is that it is inclined with respect to the road surface on which the vehicle travels.

  According to the above configuration, even when the vehicle is stopped on a slope, the facing surface is inclined with respect to the horizontal plane, and the lubricating oil is stored in the lifter below the communication hole. Part is formed. Therefore, even when the engine of a vehicle stopped on a slope starts, lubricating oil can be supplied from the lifter to the cam side located below the lifter.

According to a third aspect of the present invention, in the fuel pump according to the first or second aspect , the fuel pump is inclined so that the prescribed direction does not coincide with a direction orthogonal to a road surface on which the vehicle travels. The gist is that it is arranged.

According to the above configuration, by installing the fuel pump in an inclined state, lubricating oil is stored in the lifter even when the engine is stopped.
The invention of claim 4 is the fuel pump according to any one of claims 1 to 3, the wall portion of the lifter, the communication hole to a plurality of different positions in the direction of gravity The gist is that each is provided.

  According to the above configuration, some of the communication holes function as a dripping portion for dripping the lubricating oil from the inside of the lifter to the outside, while the other communication holes are air from the outside of the lifter to the inside. It functions as a ventilation part for making it flow in. Therefore, after starting the engine, the lubricating oil can be dropped from the lifter to the cam side through a part of the communication holes.

Sectional drawing which illustrates typically the fuel supply apparatus which is one Embodiment provided with a high-pressure fuel pump as a fuel pump . The top view at the time of seeing a lifter main body from the plunger side. Sectional drawing which illustrates the principal part of the high-pressure fuel pump in another embodiment typically. Sectional drawing which illustrates typically the principal part of the high pressure fuel pump in other another embodiment. Sectional drawing explaining the principal part of the conventional high-pressure fuel pump.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, a fuel supply device 11 for supplying fuel to an engine (not shown) includes a low-pressure fuel pump 12 that draws fuel in a fuel tank (not shown) and discharges the fuel to a predetermined pressure, and a low-pressure fuel pump 12. And a high-pressure fuel pump 13 for pressurizing the fuel discharged from the fuel pump 12. The high-pressure fuel from the high-pressure fuel pump 13 is supplied into the engine cylinder through a delivery pipe (not shown).

  Such a fuel supply device 11 is provided with a lubricating oil supply device 14 for supplying lubricating oil to the high-pressure fuel pump 13. The lubricating oil supply device 14 includes an oil pan (not shown) in which the lubricating oil is stored, a pump (not shown) driven based on rotation of a crankshaft (not shown) of the engine, and a lubricating oil pumped up from the oil pan by driving the pump. And an injection unit 141 for injecting. The injection unit 141 is disposed at a position separated from the high-pressure fuel pump 13. The injection unit 141 injects the lubricating oil toward the high-pressure fuel pump 13 and the cam 15 disposed below the high-pressure fuel pump 13.

  Next, the high-pressure fuel pump 13 of this embodiment will be described with reference to FIGS. 1 and 2. In the present embodiment, it is assumed that the left-right direction in FIG. 1 coincides with the vehicle width direction (left-right direction).

  As shown in FIG. 1, the high-pressure fuel pump 13 is arranged so that the right end (one end in the vehicle width direction) in FIG. 1 is positioned below the left end (the other end in the vehicle width direction) in the direction of gravity. It is installed in an inclined state with respect to the traveling road surface. That is, the prescribed direction, which is also the advancing / retreating direction of the plunger 20 constituting the high-pressure fuel pump 13, is different from the direction orthogonal to the road surface by a prescribed angle θ. The prescribed angle θ is set to an arbitrary angle (for example, 16 °) between “10 °” and “20 °”.

  Such a high-pressure fuel pump 13 is a guide that houses a plunger 20 that moves forward and backward in a specified direction based on the rotation of a cam 15 that is connected to a camshaft 16 that extends in the front-rear direction of the vehicle (the direction orthogonal to the paper surface in FIG. 1). A cylinder 21 is provided as an example of a member. The cylinder 21 has a guide hole 210 that opens to one end side (lower side in FIG. 1) in a prescribed direction, and a plunger chamber that is located on the other end side (upper side in FIG. 1) of the guide hole 210 in a prescribed direction. 211 are formed. The plunger chamber 211 communicates with the guide hole 210. A cylindrical lifter guide 212 whose axial center substantially coincides with the axial center of the guide hole 210 is integrally formed on one end side in the prescribed direction of the cylinder 21.

  The plunger 20 is formed in a substantially cylindrical shape extending along a prescribed direction. The plunger 20 moves forward and backward along a prescribed direction while being guided by the guide hole 210. The other end portion 200 (upper end portion in FIG. 1) of the plunger 20 can enter the plunger chamber 211 from the guide hole 210. That is, the volume of the plunger chamber 211 is changed based on the forward / backward movement along the prescribed direction of the plunger 20. One end 201 (the lower end in FIG. 1) of the plunger 20 protrudes from the opening 210a on one end side of the guide hole 210 toward the cam 15 side. That is, the one end 201 of the plunger 20 is located in the lifter guide 212. Further, a ring-shaped seal member 22 is fitted in the guide hole 210 in the vicinity of the opening 210a. Inside the seal member 22, the plunger 20 is press-fitted so as to be movable back and forth in a specified direction.

  A retainer 23 is fitted to one end 201 of the plunger 20. A biasing member 24 (for example, a coil spring) that biases the plunger 20 toward the cam 15 via the retainer 23 is provided between the retainer 23 and the cylinder 21.

  Further, the high pressure fuel pump 13 is provided with a roller lifter 30 as an example of a lifter for transmitting the driving force from the cam 15 to the plunger 20. The roller lifter 30 includes a bottomed substantially cylindrical lifter body 31 disposed in the lifter guide 212 and a roller 32 disposed between the lifter body 31 and the cam 15. The roller 32 is supported by the lifter body 31 so as to be rotatable around a shaft 33 extending along the axial direction of the camshaft 16 (a direction orthogonal to the paper surface in FIG. 1).

  The lifter body 31 has a substantially cylindrical tubular portion 310 whose outer surface faces the inner surface of the lifter guide 212, and a plan view that is located at one end (lower end in FIG. 1) of the tubular portion 310 in a specified direction. A circular bottom wall (wall) 311 is provided. Further, a support portion 312 for supporting the shaft 33 which is the rotation center of the roller 32 is provided on the lifter main body 31 so as to protrude from the cam 15 side.

  The bottom wall portion 311 of the lifter body 31 is disposed at a position between the plunger 20 and the cam 15 in a specified direction. As shown in FIGS. 1 and 2, the bottom wall portion 311 has a plurality (two in this embodiment) for communicating the inside of the lifter body 31 and the space closer to the cam 15 than the lifter body 31. Communication holes 35 (35A, 35B) are formed.

  Each communication hole 35 is disposed inside the peripheral edge of the bottom wall portion 311 in the radial direction with the plunger 20 as the center. More specifically, the communication holes 35 are respectively disposed on both sides of the plunger 20. As described above, the high-pressure fuel pump 13 is disposed in an inclined state with respect to the road surface. That is, the facing surface 311a facing the plunger 20 in the bottom wall portion 311 is inclined with respect to the road surface on which the vehicle travels. Accordingly, the communication holes 35 are open at positions that are different from each other in the direction of gravity and that are above the lowest position P1 on the facing surface 311a.

  Therefore, in the lifter main body 31, the lubricating oil flowing into the lifter main body 31 is stored below the communication holes 35 </ b> A located below the communication holes 35. The lubricating oil stored in this way is stored in the lifter body 31 even when the engine is stopped. Therefore, in the present embodiment, the portion below the communication hole 35 </ b> A in the lifter main body 31 functions as a lubricating oil reservoir 36 that stores part of the lubricating oil that has flowed into the lifter main body 31.

  When the driving force based on the rotation of the cam 15 is transmitted through the roller 32, the roller lifter 30 moves forward and backward along a specified direction. That is, the roller lifter 30 converts the rotational drive from the cam 15 into a straight drive. When such a driving force is transmitted to the plunger 20, the plunger 20 moves forward and backward along a specified direction together with the roller lifter 30. The pressure in the plunger chamber 211 is adjusted by the forward and backward movement of the plunger 20.

  Between the low pressure fuel pump 12 and the plunger chamber 211 in the fuel supply flow path to the engine, there is a spill valve 40 that is driven to permit and prohibit the flow of fuel from the low pressure fuel pump 12 side into the plunger chamber 211. Is provided. The driving of the spill valve 40 is controlled by an electronic control device (not shown). The passage 41 for pumping fuel from the plunger chamber 211 is provided with a check valve 42 that restricts the back flow of the fuel and opens when the fuel pressure in the plunger chamber 211 exceeds a predetermined pressure. It has been.

  That is, when the spill valve 40 is opened, fuel is supplied into the plunger chamber 211 from the low-pressure fuel pump 12 side. In this state, when the spill valve 40 prohibits the fuel flow into the plunger chamber 211 and the plunger 20 moves to the other side in the specified direction, the fuel pressure in the plunger chamber 211 is increased. When the fuel pressure in the plunger chamber 211 becomes equal to or higher than a predetermined pressure, the check valve 42 is opened and the fuel in the plunger chamber 211 is pumped.

  Next, the operation of the high-pressure fuel pump 13 of the present embodiment will be described focusing on the flow of lubricating oil between the roller lifter 30 and its sliding contact portion. As a premise, since the engine has not been driven for a long time, there is lubricating oil between the cam 15 and the roller lifter 30 and between the cylindrical portion 103a of the roller lifter 30 and the lifter guide 212. Make it not exist.

  Now, when the engine is started in this state, the cam 15 starts to rotate as the camshaft 16 rotates. Then, based on the rotation of the cam 15, the roller lifter 30 and the plunger 20 move forward and backward in a specified direction. Immediately after the engine is started, the lubricating oil is hardly supplied from the injection unit 141 of the lubricating oil supply device 14 to the high-pressure fuel pump 13 side. In particular, when the viscosity of the lubricating oil is high, such as at low temperatures (for example, −30 ° C.), some time is required until the lubricating oil is properly supplied to the high-pressure fuel pump 13 side. It becomes.

  If a period in which no lubricating oil is present between the cam 15 and the roller lifter 30 and between the roller lifter 30 and the lifter guide 212 continues for a long time, the lifter body 31 of the roller lifter 30 may be seized. In this regard, in the present embodiment, a lubricating oil reservoir 36 that stores lubricating oil is formed in the lifter body 31. In addition, a communication hole 35 </ b> A is formed in the bottom wall portion 311 of the lifter main body 31 at a position closest to the lubricating oil storage portion 36.

  Therefore, when the forward / backward movement of the roller lifter 30 is started, the vibration accompanying the forward / backward movement of the roller lifter 30 is transmitted to the lubricating oil in the lubricating oil reservoir 36. Then, the lubricating oil in the lubricating oil reservoir 36 overflows from the lubricating oil reservoir 36. A part of the lubricating oil overflowing in this way is dropped outside the lifter body 31 through the communication hole 35A. At this time, the communication hole 35 </ b> B functions as a ventilation portion for allowing air to flow into the lifter body 31 from the outside of the lifter body 31. However, a part of the lubricating oil overflowing from the lubricating oil reservoir 36 may be dropped out of the lifter body 31 from the communication hole 35B.

  Then, the lubricating oil dropped from the lifter body 31 adheres to members (rollers 32 and cams 15) located below the lifter body 31. Then, the lubricating oil reduces the frictional force generated between the cam 15 and the roller lifter 30 that is in sliding contact with the cam 15 (in this case, the outer peripheral surface of the roller 32).

  A part of the lubricating oil adhering to the cam 15 is blown off to the lifter guide 212 side by a centrifugal force based on the rotation of the cam 15. Such lubricating oil enters between the inner side surface of the lifter guide 212 and the outer side surface of the cylindrical portion 103 a of the lifter body 31. Then, the frictional force generated between the lifter guide 212 and the cylindrical portion 310 of the lifter main body 31 by the lubricating oil is reduced as compared with the case where no lubricating oil is present. As a result, the seizure of the lifter body 31 is suppressed.

  The temperature of the lubricating oil in the oil pan (not shown) also increases and the viscosity of the lubricating oil decreases until almost no lubricating oil is left in the lubricating oil reservoir 36. Then, the lubricating oil is appropriately supplied from the injection unit 141 of the lubricating oil supply device 14 to the high-pressure fuel pump 13 side.

Therefore, in this embodiment, the following effects can be obtained.
(1) Lubricating oil is stored in the lubricating oil reservoir 36 formed in the lifter body 31 constituting the roller lifter 30 even after the vehicle engine is stopped. Therefore, when the roller lifter 30 moves back and forth in a specified direction by the rotation of the cam 15, the lubricating oil in the lubricating oil reservoir 36 is gradually camped through the communication hole 35 formed in the bottom wall portion 311 of the lifter body 31. Dropped on the 15th side. As a result, after starting the engine, the dropped lubricating oil functions as lubricating oil in the high-pressure fuel pump 13. Therefore, it is possible to suppress the occurrence of seizure in the roller lifter 30 after the start of the engine, as compared with the conventional case in which the lubricating oil stored in the lifter body 31 is not provided with a function of dropping the lubricating oil to the cam 15 side.

  (2) In the present embodiment, the facing surface 311a of the bottom wall 311 of the lifter body 31 is inclined with respect to the road surface on which the vehicle travels. Therefore, a part of the lubricating oil that has flowed into the lifter body 31 can be stored in the lifter body 31 below the communication hole 35A without providing a projection or the like on the bottom wall portion 311. That is, the lubricating oil reservoir 36 can be formed in the lifter body 31 without complicating the shape of the lifter body 31.

  (3) In the present embodiment, the high-pressure fuel pump 13 is arranged so that the direction in which the plunger 20 moves forward and backward (that is, the specified direction) does not coincide with the direction orthogonal to the road surface. Thus, by devising the arrangement mode of the high-pressure fuel pump 13, the lubricating oil reservoir 36 can be formed in the lifter body 31 without complicating the structure of the high-pressure fuel pump 13.

  (4) In the present embodiment, the high-pressure fuel pump 13 is arranged such that one end (right end in FIG. 1) in the width direction of the vehicle is positioned below the other end (left end in FIG. 1) in the width direction. . Therefore, even when the engine is stopped with the vehicle stopped on a horizontal road, or when the engine is stopped with the vehicle stopped on a slope, the bottom wall 311 of the lifter body 31 Since the opposing surface 311a is inclined with respect to the horizontal plane, the lubricating oil can be stored in the lifter body 31. That is, regardless of the gradient of the road surface on which the vehicle is stopped, the lubricating oil can be dripped from the lifter body 31 to the cam 15 side after the start of the engine, and seizure of the roller lifter 30 can be suppressed.

  (5) Communication holes 35A and 35B are formed in the bottom wall portion 311 of the lifter body 31 at positions different from each other in the direction of gravity. Therefore, among the communication holes 35A and 35B, the communication hole 35A located at a position close to the lubricating oil reservoir 36 causes the lubricating oil in the lubricating oil reservoir 36 to drop toward the cam 15 when the roller lifter 30 moves forward and backward. It functions as a dripping part. On the other hand, the other communication hole 35 </ b> B functions as a ventilation portion for allowing air to flow into the lifter body 31 from the outside of the lifter body 31. Therefore, compared with the case where only one communication hole 35 is provided in the bottom wall portion 311, the lubricating oil can be easily dropped from the lifter body 31 to the cam 15 side.

  (6) The injection unit 141 of the lubricating oil supply device 14 is disposed at a position away from the cylinder 21 of the high-pressure fuel pump 13. Therefore, it is difficult to supply high-viscosity lubricating oil from the injection unit 141 to the high-pressure fuel pump 13 side. In particular, when the viscosity of the lubricating oil is high, the lubricating oil may not reach the high-pressure fuel pump 13 or the cam 15 even if the lubricating oil can be injected from the injection unit 141. In this respect, in the present embodiment, as described above, the lubricating oil is stored in the lifter body 31, and the lubricating oil is supplied to the cam 15 side through the communication hole 35 based on the forward / backward movement of the roller lifter 30. Is done. That is, the lubricating oil is stored in the lifter body 31 until the temperature of the lubricating oil rises and the viscosity of the lubricating oil decreases and the lubricating oil can be supplied from the injection unit 141 to the high-pressure fuel pump 13 side. The occurrence of seizure of the roller lifter 30 can be suppressed by the lubricating oil.

The embodiment may be changed to another embodiment as described below.
-In embodiment, the structure which does not have the roller 32 may be sufficient as a lifter, as shown in FIG. In this case, the lifter 50 is formed in a substantially cylindrical shape with a bottom, and the cam 15 is in sliding contact with the bottom wall portion 51 of the lifter 50. Even with this configuration, an effect equivalent to that of the above embodiment can be obtained. In addition, illustration of the cylinder 21 is abbreviate | omitted in FIG.

  In the embodiment, the bottom wall portion 311 of the lifter body 31 may be provided with an arbitrary number (for example, three) of communication holes 35 other than two. In this case, it is preferable to arrange some of the communication holes 35 at different positions in the direction of gravity from the other communication holes.

Further, only one communication hole 35 may be provided in the bottom wall portion 311.
In the embodiment, if the lubricating oil can be stored in the lifter even when the engine is stopped, the high-pressure fuel pump 13 is arranged so that the direction in which the plunger 20 moves forward and backward matches the direction perpendicular to the road surface. Also good.

  For example, as shown in FIG. 3, the lifter 50 has a bottom wall 51 that gradually becomes thinner from the other end in the width direction of the vehicle (left end in FIG. 3) to one end in the width direction (right end in FIG. 3). It may be configured. Even if comprised in this way, the opposing surface 52 which opposes the plunger 20 in the bottom wall part 51 can be made to incline with respect to the road surface which a vehicle drive | works. Therefore, an effect equivalent to that of the above embodiment can be obtained.

  As shown in FIG. 4, an annular groove 55 may be provided on the periphery of the bottom wall 51 of the lifter 50. In this case, the groove portion 55 functions as a lubricating oil storage portion that stores the lubricating oil even when the engine is stopped. In such a configuration, the communication hole 35 is preferably provided inside the groove portion 55. Thus, even if the opposing surface 52 of the bottom wall portion 51 is not inclined with respect to the road surface, the same effect as in the above embodiment can be obtained. In addition, illustration of the cylinder 21 is abbreviate | omitted in FIG.

  Further, an annular ridge may be provided on the bottom wall portion 51 of the lifter 50, and the lubricating oil may be stored in a space surrounded by the ridge. In this case, the protruding portion functions as a lubricating oil reservoir. In such a configuration, it is preferable that the communication hole 35 is provided outside the protruding portion.

  -In embodiment, you may install the high pressure fuel pump 13 in an engine room in the aspect in which the left-right direction in FIG. 1 corresponds with the front-back direction of a vehicle. In this case, it is preferable to set the specified angle θ so that the lubricating oil can be stored in the lifter body 31 regardless of the gradient of the road surface on which the vehicle stops. In general, the maximum value of the slope of the road surface on which the vehicle is stopped is assumed to be about “25 °”. Therefore, the high-pressure fuel pump 13 may be arranged so that the specified angle θ is an angle larger than “25 °” (for example, 40 °) when the vehicle is positioned on a road surface that can be regarded as a horizontal road. preferable.

  In the embodiment, the injection unit of the lubricating oil supply device 14 may be provided in the lifter guide 212. In this case, the lubricating oil supply device 14 may be provided with a supply pipe for supplying the lubricating oil discharged from the pump to the lifter guide 212 side. The lifter guide 212 may be provided with a through hole that communicates with the supply pipeline. In this case, the through hole functions as an injection unit.

  DESCRIPTION OF SYMBOLS 11 ... Fuel supply apparatus, 13 ... High pressure fuel pump as a fuel pump, 141 ... Injection part, 15 ... Cam, 20 ... Plunger, 21 ... Cylinder as an example of a guide member, 210 ... Guide hole, 30 ... As an example of lifter Roller lifters, 311, 51 ... bottom wall part as an example of a wall part, 311a, 52 ... opposing surfaces, 35, 35A, 35B ... communication holes, 36 ... lubricating oil storage part, 50 ... lifter, 55 ... lubricating oil storage part As an example, a groove portion, P1.

Claims (4)

Fuel is pumped based on a driving force input from a cam, the guide member being disposed above the cam and having a guide hole extending along a prescribed direction, and the prescribed direction in the guide hole A fuel pump comprising: a plunger that moves forward and backward along the lift; and a lifter for transmitting a driving force from the cam to the plunger;
A cam that is disposed below the fuel pump and that drives to apply a driving force to the lifter;
An injection unit that is disposed at a position different from the guide member and injects lubricating oil toward the fuel pump;
The lifter includes a cylindrical portion and a bottom wall portion located at one end of the cylindrical portion in the prescribed direction,
The bottom wall is formed with a communication hole for communicating the inside and outside of the lifter,
The facing surface facing the plunger in the bottom wall portion is inclined with respect to the road surface on which the vehicle travels,
The communication hole opens at a position different from the lowest position in the gravitational direction on the facing surface of the bottom wall portion, and the facing surface where the communication hole is formed is a flat surface facing the plunger. Of the adjacent flat surface is a portion below the gravitational direction than the portion facing the plunger,
A fuel supply apparatus characterized in that friction between the outer peripheral surface of the tubular portion and the inner peripheral surface of the guide member is reduced by the oil supplied to the fuel pump by the injection portion. The facing surface claim 1, characterized in that, the inclined with respect to the road surface on which the vehicle travels so that one end side in the width direction of the vehicle is positioned downwards in the direction of gravity than the other side in the width direction The fuel supply device described in 1. Said fuel pump, the fuel supply device according to claim 1 or claim 2, characterized in that the direction of the provision is arranged in an inclined so as not to coincide with the direction perpendicular to the road surface on which the vehicle travels . The wall portion of the lifter, the fuel supply device according to any one of claims 1 to 3, wherein the communication hole to a plurality of different positions in the direction of gravity are provided .

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