JP2010249101A - Fuel injection pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel injection pump, preventing a lubricating oil from entering a pump housing through the gap between a tappet and a pump housing and preventing the lubricating oil from being mixed with fuel. <P>SOLUTION: One end of a tappet oil passage part for guiding the lubricating oil from the outer periphery of the tappet 91 to an insert hole 91a for inserting a tappet pin 96 supporting a tappet roller 97 is communicated with a lubricating oil hole 92, the other end of the tappet oil passage part is communicated with a tappet pin oil passage 95 formed in the tappet pin 96, and a lubricating oil staying part 95d is provided between the tappet pin 96 and the tappet roller 97 at the other end of the tappet pin oil passage 95. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel injection pump configured to slide a plunger up and down with a cam, and more particularly, to a technique for preventing intrusion of lubricating oil into a pump housing.

2. Description of the Related Art Conventionally, a fuel injection pump in which a sleeve is rotatably fitted on the outer periphery of a lower end portion of a plunger barrel into which a plunger is inserted, and a pinion that interlocks with a fuel control mechanism is formed on the outer periphery of the sleeve is known (for example, Patent Document 1).
In this conventional configuration, the fuel injection pump includes a tappet. The tappet includes a tappet roller and a tappet pin, and is provided at the lower end portion of the pump housing of the fuel injection pump so as to be slidable up and down. Lubricating oil ports for injecting lubricating oil for lubricating between the tappet and the pump housing and between the tappet pin and the tappet roller are provided at a portion where the pump housing and the tappet are in contact with each other.

  However, due to the sliding of the tappet, the lubricating oil that has entered the pump housing from the gap between the tappet and the pump housing may be mixed into the fuel oil. As a result, the lubricating oil is reduced, and impurities are mixed in the fuel, which causes an injection failure at the injection nozzle, which in turn leads to a reduction in engine combustion efficiency.

JP 2002-70692 A

  Therefore, in view of such a problem, the present invention provides a fuel injection pump that prevents the lubricating oil from entering the pump housing through the gap between the tappet and the pump housing and prevents the lubricating oil from mixing with the fuel.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to the first aspect of the present invention, a plunger for pumping fuel, a plunger barrel for housing the plunger, a tappet connected to the plunger barrel and the lower portion of the plunger, and a spring for biasing the tappet toward the cam are accommodated. A pump housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported by the lower portion of the tappet, and a tappet sliding surface and a tappet roller provided on a lower side surface of the pump housing. One end of a tappet oil passage section that guides the lubricant oil from the outer periphery of the tappet to an insertion hole for inserting a tappet pin that supports the tappet roller. A tappet in which the other end of the tappet oil passage is formed as a tappet pin Down oil passage and communicating, a second end of the Tapettopin oil passage, is provided with a lubricant retaining portion between the Tapettopin and tappet rollers.

  According to a second aspect of the present invention, the lubricating oil retaining portion communicates with an oil passage that guides the lubricating oil to the outside of the pump housing.

  4. The pump according to claim 3, wherein the pump accommodates a plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing; In a fuel injection pump comprising a lubricating oil port for supplying lubricating oil to a moving surface, at least one of a pump housing or a tappet located above the lubricating oil port in a state where the tappet is located at a bottom dead center An annular recovery groove is formed on either side, and lubricating oil is discharged to communicate with the outside of the pump housing. It is those in communication with.

  5. The pump according to claim 4, wherein the pump accommodates a plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing; A fuel injection pump comprising a lubricating oil port for supplying lubricating oil to a moving surface, wherein the lubricating oil port and an oil passage for supplying lubricating oil from the outer periphery of the tappet to the rotating sliding surface of the tappet roller are raised tappets It communicates at a position and closes at a lowered position.

  6. The pump according to claim 5, wherein the pump accommodates a plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing; A fuel injection pump including a lubricating oil port that supplies lubricating oil to a moving surface is provided with a pressure regulating valve for adjusting a pressure applied to the lubricating oil in the middle of the lubricating oil port.

  7. The pump according to claim 6, wherein the pump accommodates a plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing; In a fuel injection pump comprising a lubricating oil port that supplies lubricating oil to a moving surface, a valve body that opens and closes the lubricating oil port is provided in the middle of the lubricating oil port, and the valve body responds to the raising and lowering of the tappet. It is configured to be opened and closed.

  8. The pump according to claim 7, comprising a plunger for pumping fuel, a plunger barrel for housing the plunger, a tappet connected to the plunger barrel and a lower portion of the plunger, and a spring for biasing the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing. And a lubricating oil port that supplies lubricating oil to the moving surface, wherein the lubricating oil port forms a discharge port that opens downward, and the lower end of the tappet according to the position of the discharge port The lid is provided, and the lid is configured to close the discharge port at the top dead center in the vertical sliding of the tappet.

  9. The pump according to claim 8, wherein the pump accommodates a plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam. A housing, a cam that reciprocally slides the plunger in contact with a tappet roller rotatably supported on the lower portion of the tappet, and a sliding surface of the tappet and a rotary slide of the tappet roller provided on a lower side surface of the pump housing; In a fuel injection pump comprising a lubricating oil port for supplying lubricating oil to a moving surface, the side wall of the tappet above the lubricating oil port is lifted by a cam with the tappet positioned at the bottom dead center. The length is more than doubled.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect, the lubricating oil easily flows from the tappet pin oil passage between the tappet pin and the tappet roller. In addition, it is possible to reduce the amount of lubricating oil that has conventionally flowed into the pump housing from the top of the tappet.

  According to the second aspect of the present invention, it is possible to reduce the amount of the lubricating oil that has flowed into the pump housing from the upper portion of the tappet by discharging the overflowing lubricating oil from the lubricating oil retention portion.

  According to the third aspect of the present invention, it is possible to discharge the lubricating oil that has flowed into the pump housing from the upper part of the tappet. Further, it is possible to prevent the lubricating oil from entering the pump housing along the outer peripheral surface of the tappet and the inner peripheral surface of the pump housing.

  According to the fourth aspect of the present invention, since the lubricating oil flows only at the ascending position of the tappet, the lubricating oil can be injected into the tappet only when the pressure of the plunger is applied.

  According to the fifth aspect, the lubricating oil can be injected into the tappet only when the pressure of the plunger is applied. Further, the pressure of the plunger can be adjusted by the pressure regulating valve, and the lubricating oil port can be depressurized except when lubricating oil is injected.

  According to the sixth aspect of the present invention, the lubricating oil to the tappet can be injected only when the pressure of the plunger is applied, the time for the tappet to come into contact with the lubricating oil is shortened, and it rises from between the pump housing and the tappet so that It is possible to reduce the lubricating oil that penetrates into

  According to the seventh aspect, since the lubricating oil flows only when the tappet is at the top dead center in the vertical sliding, the lubricating oil can be injected into the tappet only when the pressure of the plunger is applied.

  According to the eighth aspect of the present invention, even when the lubricating oil rises due to contact between the outer peripheral surface of the tappet and the inner peripheral surface of the pump housing, it is possible to prevent the tappet from entering the pump housing beyond the outer peripheral surface of the tappet.

1 is a side sectional view showing an overall configuration of a fuel injection pump according to an embodiment of the present invention attached to an engine block. Side surface sectional drawing of a fuel injection pump. Sectional drawing of the fuel-injection pump lower part which concerns on a 1st Example. Sectional drawing of the fuel-injection pump lower part which concerns on a 2nd Example. Sectional drawing of the fuel-injection pump lower part which concerns on a 3rd Example. Sectional drawing of the fuel-injection pump lower part which concerns on 4th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 5th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 6th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 7th Example. Sectional drawing of the fuel-injection pump lower part which concerns on an 8th Example. Sectional drawing of the fuel-injection pump lower part which concerns on a 9th Example. Sectional drawing of the fuel-injection pump lower part which concerns on a 10th Example. Sectional drawing of the fuel injection pump lower part which concerns on an 11th Example. Sectional drawing of the fuel injection pump lower part which concerns on 12th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 13th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 14th Example. Sectional drawing of the fuel-injection pump lower part which concerns on 15th Example. Sectional drawing of the fuel injection pump lower part which concerns on 16th Example.

Next, embodiments of the invention will be described.
First, the configuration of a fuel injection pump according to an embodiment of the present invention will be described.
In the fuel injection pump, as shown in FIGS. 1 and 2, a plunger barrel 2 that is also formed in a cylindrical shape is inserted into a pump housing 1 that is formed in a cylindrical shape.
A plunger 4 is inserted into the plunger insertion hole 3 of the plunger barrel 2 so as to be slidable in the vertical direction. An annular fuel chamber 5 is formed on the upper inner peripheral surface of the pump housing 1 along the outer peripheral surface of the upper end of the plunger barrel 2, and fuel is always supplied to the fuel chamber 5.

  A fuel supply port 9 is formed toward the pressurizing chamber 8 at the top of the plunger 4 in the fuel chamber 5 and the plunger insertion hole 3. A lead 10 for adjusting the fuel injection amount is formed on the outer periphery of the upper end portion of the plunger 4. Further, a fuel escape groove 12 is formed along the circumferential direction on the plunger sliding surface of the plunger barrel 2, in other words, on the inner peripheral surface of the plunger insertion hole 3, and this fuel escape groove 12 is inclined with respect to the fuel chamber 5. It communicates via the path 14.

  When the plunger 4 slides upward, the top portion of the plunger 4 first closes the fuel supply port 9 to pressurize the fuel in the pressurizing chamber 8 and push the open delivery valve 15 above to open, thereby discharging the fuel. Further sliding in this state causes the lead 10 to communicate with the fuel escape groove 12, so that fuel injection is completed. The communication timing between the lead 10 and the fuel escape groove 12 can be changed by rotating the plunger 4, and the fuel injection amount is adjusted by changing the communication period.

  As shown in FIG. 2, a pinion sleeve 18 having a pinion 17 formed on the outer periphery is externally fitted to the small diameter portion at the lower end of the plunger barrel 2 so as to be rotatable in the circumferential direction. The pinion 17 meshes with a fuel control rack 19 that is inserted laterally into the pump housing 1, and the fuel control rack 19 is configured to interlock with a fuel control mechanism (not shown). The lower end portion of the pinion sleeve 18 protrudes downward from the plunger barrel 2, and the lower end portion of the pinion sleeve 18 engages with the plunger flange 21 at the lower end portion of the plunger 4, so that the pinion sleeve 18 and the plunger 4 are engaged. And can be rotated together.

  A tappet 91 that is formed in a bowl shape and rotatably supports a tappet roller 97 at its lower end portion is inserted below the plunger collar 21 so as to be slidable in the vertical direction in the pump housing 1. A plunger spring 25 for pushing the plunger 4 downward is interposed between an upper spring receiver 24 fitted on the outer periphery of the pinion sleeve 18 and a lower spring receiver 43 fitted in the tappet 91. .

  An upper end surface of the upper spring receiver 24 is supported in contact with a downward step formed on the outer periphery of the pinion sleeve 18 and a downward step formed on the inner periphery of the pump housing 1. A spring chamber 28 is formed between 24 and the lower spring receiver 43.

  The fuel injection pump configured as described above is inserted and mounted in the engine block 500 of the engine, and the tappet roller 97 of the tappet 91 is in contact with the cam 7 formed integrally with the cam shaft 6. The plunger 4 slides up and down by the rotation of the cam 7. The cam 7 and the cam shaft 6 are disposed in a cam chamber 501 provided in the engine block 500 of the engine.

Further, as shown in FIG. 2, the tappet 91 is formed in a bowl shape with the top open, and a tappet pin 96 is horizontally mounted in the bottom of the tappet 91, and a tappet roller 97 is rotatably supported on the tappet pin 96. Has been.
A lubricating oil port 92 is provided on the inner periphery of the pump housing 1 to send the lubricating oil to a position always in contact with the outer peripheral surface of the tappet 91 between the top dead center and the bottom dead center of the tappet 91 that slides up and down. .

  Further, as shown in FIG. 1, a lubricating oil supply passage 34 is formed in a portion of the engine block 500 that supports the lower end portion of the pump housing 1. The lubricating oil supply passage 34 is connected to the lubricating oil pump 36, and the lubricating oil stored in the oil pan 35 is supplied to the lubricating oil supply passage 34 by the lubricating oil pump 36. The lubricating oil supply passage 34 is connected to the lubricating oil port 92, and the lubricating oil is supplied from the lubricating oil port 92 to the tappet 91.

  As shown in FIG. 2, a tappet pin oil passage 95 is provided inside the tappet pin 96. The tappet pin oil passage 95 is an oil passage for sending the lubricating oil sent from the lubricating oil port 92 of the pump housing 1 into the tappet pin 96.

A lower spring receiver 43 and a ring 46 are fitted in the tappet 91. The lower spring receiver 43 is formed at the center of the disc with the protrusion 43a protruding upward, and the lower end of the plunger 4 is locked to the protrusion 43a. The lower end of the plunger spring 25 is fitted around the protrusion 43 a of the lower spring receiver 43. Note that the tappet 91 and the lower spring receiver 43 can be configured integrally.
As shown in FIG. 2, the ring 46 prevents the upper surface of the tappet roller 97 from coming into contact with the lower spring receiver 43 so that the tappet roller 97 rotates smoothly. The ring 46 is interposed between the tappet 91 and the lower spring receiver 43, and forms a space between the tappet roller 97 and the lower spring receiver 43.

Next, the lubricating structure 101 of the first embodiment of the tappet 91 will be described with reference to FIG.
The lubricating oil port 92 provided in the pump housing 1 is penetrated from the outer peripheral surface to the inner peripheral surface in a direction (radial direction) orthogonal to the vertical direction.
Further, a tappet oil passage portion is provided to guide the lubricating oil from the outer periphery of the tappet 91 to the insertion hole 91a into which the tappet pin 96 that supports the tappet roller 97 is inserted. One end of the tappet oil passage portion communicates with the lubricating oil port 92, and the other end of the tappet oil passage portion communicates with a tappet pin oil passage 95 formed in the tappet pin 96. The tappet oil passage portion includes a tappet circumferential oil passage 93 and a tappet internal oil passage 94. The tappet circumferential oil passage 93 extends in a vertical groove shape in the vertical direction on the outer circumferential surface of the tappet 91. The upper end of the tappet circumferential oil passage 93 is located at the bottom dead center when the tappet 91 is slid up and down, and the upper end of the tappet circumferential oil passage 93 is slid up and down. It is configured to be at a position facing the lubricating oil port 92 at the top dead center when moved. That is, when the tappet 91 is slid up and down, the lubricating oil port 92 and the tappet circumferential oil passage 93 are always in communication. The tappet internal oil passage 94 is provided so as to extend from the lower end of the tappet circumferential oil passage 93 to the insertion hole 91a through which the tappet 91 passes obliquely downward in the center and into which the tappet pin 96 is inserted. The end (lower end) is configured to communicate with a tappet pin oil passage 95 formed in the tappet pin 96.
The tappet pin oil passage 95 is provided on the outer periphery and the inside of the tappet pin 96 and guides and lubricates the lubricating oil from the tappet oil passage portion to the contact portion between the tappet roller 97 and the tappet pin 96.

The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, a third oil passage 95c, and a lubricating oil retaining portion 95d. The first oil passage 95a is an oil passage that connects the lower end of the tappet internal oil passage 94 and the second oil passage 95b, and obliquely penetrates the shaft center portion from one outer periphery to the other outer periphery of the tappet pin 96. Is drilled. The second oil passage 95b is an oil passage communicating the first oil passage 95a and the lubricating oil retaining portion 95d, and is formed in an annular groove on the outer periphery of the tappet pin 96 at the center in the axial direction. The third oil passage 95 c is formed in an annular groove on the outer periphery of the tappet pin 96 at the position of the lower end of the tappet internal oil passage 94. The lubricating oil retention portion 95d is a space for storing lubricating oil between the outer periphery of the tappet pin 96 and the inner periphery of the tappet roller 97, and is formed in the upper portion of the third oil passage 95c. A portion (a central portion in the axial center direction) of the portion in contact with the surface is scraped.
With this configuration, the lubricating oil can easily flow from the lubricating oil port 92 to the tappet pin oil passage 95 via the tappet circumferential oil passage 93, and from the second oil passage 95 b to between the tappet pin 96 and the tappet roller 97. Lubricating oil flows, and it is possible to reduce the amount of lubricating oil that has conventionally flowed into the pump housing 1 from the upper portion of the tappet 91.

Next, the lubrication structure 102 of the tappet 91 according to the second embodiment will be described with reference to FIG. However, in the following embodiments, the same points as those in the first embodiment described above are denoted by the same reference numerals, the detailed description thereof will be omitted, and differences will be mainly described.
The lubricating oil path to the tappet pin oil path 95 has the same configuration as in the first embodiment.
The tappet pin oil passage 95 includes a fourth oil passage 95e in addition to the first oil passage 95a, the second oil passage 95b, the third oil passage 95c, and the lubricating oil retaining portion 95d of the first embodiment.

The fourth oil passage 95e is an oil passage that communicates one side face of the tappet pin 96 with the lubricating oil retaining portion 95d and guides the lubricating oil to the outside of the pump housing 1, and the tappet internal oil passage 94 in the lubricating oil retaining portion 95d. The tappet pin 96 is drilled from the opposite end to the center portion of the side surface opposite to the tappet internal oil passage 94.
A lubricating oil discharge oil passage 130 is provided on the lower inner peripheral surface of the pump housing 1 opposite to the lubricating oil port 92. When the tappet 91 is slid up and down on the lower inner peripheral surface of the pump housing 1, the lubricating oil discharge oil passage 130 is always in the vertical direction at a position where the opening of the fourth oil passage 95 e on the side surface of the tappet pin 96 faces. It is provided in a groove shape.
Thus, the lubricating oil from the tappet pin oil passage 95 is discharged to the lubricating oil discharge oil passage 130 and drops into the cam chamber 501 in which the cam 7, the cam shaft 6 and the like are housed.

  With this configuration, the lubricating oil can easily flow from the second oil passage 95b to the space between the tappet pin 96 and the tappet roller 97. In addition, the lubricating oil overflowing from the lubricating oil retention portion 95d is dropped into the cam chamber 501 and discharged, thereby reducing the amount of lubricating oil that has flowed into the pump housing 1 from the upper portion of the tappet 91. It becomes possible.

  Next, in a state where the tappet 91 is located at the bottom dead center, an annular collection groove is formed in at least one of the pump housing 1 and the tappet 91 located above the lubricating oil port 92, The third to sixth embodiments will be described in which the recovery groove communicates with the lubricating oil discharge passage communicating with the outside of the pump housing 1.

The lubricating structure 103 of the tappet 91 according to the third embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided. However, in the following embodiments, the lubricating oil retaining portion 95d of the first embodiment and the fourth oil passage 95e of the second embodiment are not provided, but the lubricating oil retaining portion 95d of the first embodiment is described. The fourth oil passage 95e of the second embodiment may be provided.

On the inner peripheral surface of the pump housing 1, there are a pump housing side recovery groove 140 and a lubricant oil discharge oil passage 141 for recovering the lubricant so that the lubricant does not rise into the upper space from the gap with the tappet 91. Is provided. The pump housing side recovery groove 140 is on the inner peripheral surface of the pump housing 1 at a position above the lubricating oil port 92 and lower than the upper end of the tappet 91 when the tappet 91 is located at the bottom dead center. It is formed in an annular groove shape.
The lubricating oil discharge oil passage 141 has an upper end communicating with the pump housing side collection groove 140, a lower end extending to the lower end of the pump housing 1, and one or a plurality of places on the inner peripheral surface of the pump housing 1. The lubricating oil discharge oil passage 141 is formed on the inner peripheral surface of the pump housing 1 so as to extend in a groove shape from the lower portion of the pump housing side collection groove 140 to the lower end of the pump housing 1 in parallel with the axis of the tappet 91. . Thus, the lubricating oil in the pump housing side recovery groove 140 is dropped from the lubricating oil discharge oil passage 141 to the cam chamber 501.

  With this configuration, the lubricating oil that has risen when the tappet 91 has moved up and down enters the pump housing side recovery groove 140, and the lubricating oil can be discharged from the lubricating oil discharge oil passage 141 to the cam chamber 501. .

Next, the structure different from the first embodiment of the lubricating structure 104 of the tappet 91 according to the fourth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

Further, on the outer periphery of the tappet 91, in addition to the tappet peripheral surface oil passage 93 of the first embodiment, a tappet side recovery groove 150 and a lubricating oil discharge groove 151 are provided on the outer peripheral surface, and lubrication is performed from a gap with the pump housing 1. It is provided to recover the lubricating oil so that it does not rise into its upper space.
The tappet side collection groove 150 is formed in an annular groove on the outer peripheral surface of the tappet 91 above the upper end of the lubricating oil port 92 in a state where the tappet 91 is located at the bottom dead center.
The upper end of the lubricating oil discharge groove 151 communicates with the tappet side collection groove 150 on the outer peripheral surface of the tappet 91, and extends in a groove shape to the lower portion of the tappet 91 in parallel with the axis of the tappet 91. Further, a lower portion of the pump housing 1 is provided with a lubricating oil discharge port 152 penetrating in a radial direction from the outer periphery toward the lubricating oil discharge groove 151, and from the outer side of the lubricating oil discharge port 152, A lubricating oil discharge oil passage 153 is provided in the vertical direction in a groove shape in parallel to the lower end of the pump housing 1. In this way, the tappet side recovery groove 150, the lubricating oil discharge groove 151, the lubricating oil discharge port 152, and the lubricating oil discharge oil passage 153 communicate with each other. The oil is dropped from the lubricating oil discharge oil passage 153 to the cam chamber 501 through the outlet 152.

  With this configuration, the lubricating oil that has risen when the tappet 91 is raised and lowered enters the tappet side collecting groove 150 and can be discharged to the cam chamber 501.

Next, the lubricating structure 105 of the tappet 91 according to the fifth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

When the tappet 91 is at the bottom dead center on the inner peripheral surface of the pump housing 1 and above the lubricating oil port 92, an annular pump housing side collection groove is formed at a position facing the upper end of the tappet 91. 160 is formed. Specifically, in the state where the tappet 91 is located at the bottom dead center, the upper end of the tappet 91 is above the lower end of the pump housing side recovery groove 160 opened to the inside and is higher than the upper end of the pump housing side recovery groove 160. It is configured to be at a low position (located at the approximate center of the vertical width). Thus, the raised lubricating oil is prevented from entering the tappet 91. Further, the diameter of the upper inner peripheral portion 162 of the pump housing 1 on the upper side of the pump housing side recovery groove 160 is configured to be larger than the outer diameter of the tappet 91, and when the tappet 91 is raised and lowered, The tappet 91 and the upper inner peripheral portion 162 of the pump housing 1 are not in contact with each other. In this way, the lubricating oil is prevented from being lifted up above the pump housing side collection groove 160.
The pump housing side recovery groove 160 communicates with a lubricating oil discharge oil passage 161 extending to the outside of the pump housing 1. The lubricating oil discharge oil passage 161 is provided in the vertical direction at a position avoiding the lubricating oil port 92 on the outer periphery of the pump housing 1, and the upper end of the lubricating oil discharge oil passage 161 communicates with the pump housing side collection groove 160. The lower end extends to the lower end of the pump housing 1.

  With this configuration, even when the tappet 91 moves up and down and the lubricating oil is lifted from the gap between the tappet 91 and the pump housing 1, the leaked lubricating oil accumulates in the pump housing side collection groove 160. The stored lubricating oil is dropped from the lubricating oil discharge oil passage 161 to the cam chamber 501. Further, since the outer peripheral surface of the tappet 91 and the upper inner peripheral portion 162 of the pump housing 1 are not in contact with each other, the lubricating oil enters the pump housing 1 through the gap between the outer peripheral surface of the tappet 91 and the inner peripheral surface of the pump housing 1. Can be prevented.

Next, the structure different from the first embodiment of the lubricating structure 106 of the tappet 91 according to the sixth embodiment will be described with reference to FIG.
In the sixth embodiment, instead of providing the pump housing side recovery groove 160 and the upper inner peripheral portion 162 of the fifth embodiment, the tappet side recovery groove 170 and the lubricating oil discharge oil passage 161 upper portion A lubricating oil discharge port 171 that communicates with the inner peripheral surface of the pump housing 1 is provided.

  The tappet side collection groove 170 is formed in a groove having a vertical width that allows a predetermined amount of lubricating oil to be accumulated on the outer peripheral surface of the upper end of the tappet 91. The lubricating oil discharge port 171 is at a height at which the tappet side collection groove 170 is located at the bottom dead center of the vertical sliding of the tappet 91 so as to penetrate from the inner peripheral surface of the pump housing 1 to the upper end of the lubricating oil discharge oil passage 161. Configured to communicate.

  By configuring in this way, even if the tappet 91 is moved up and down and the lubricating oil is lifted from the gap between the tappet 91 and the pump housing 1, the leaked lubricating oil is accumulated in the tappet side collection groove 170. The stored lubricating oil is dropped from the lubricating oil discharge oil passage 161 to the cam chamber 501 through the lubricating oil discharge port 171. Further, since the upper outer peripheral surface of the tappet 91 and the inner peripheral surface of the pump housing 1 are not in contact with each other, the lubricating oil travels between the outer peripheral surface of the tappet 91 and the inner peripheral surface of the pump housing 1 and enters the pump housing 1. Infiltration can be prevented.

  Next, the lubricating oil port 92 and the oil passage for supplying lubricating oil from the outer periphery of the tappet 91 to the rotational sliding surface of the tappet roller 97 communicate with each other at the ascending position of the tappet 91 and close at the descending position. A configuration for preventing the lifting of the camera will be described.

Next, the structure different from the first embodiment of the lubricating structure 107 of the tappet 91 according to the seventh embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

  Further, a tappet circumferential oil passage 183 is provided on the outer periphery of the tappet 91 instead of the tappet circumferential oil passage 93 of the first embodiment. The tappet circumferential oil passage 183 is provided on the outer circumferential surface of the tappet 91 only at a position facing the lubricating oil port 92 at the top dead center where the tappet 91 slides up and down.

  With this configuration, the lubricating oil flows only when the tappet 91 is at the top dead center. Therefore, the lubricating oil can be injected into the tappet 91 only when the pressure of the plunger 4 is applied.

  Next, a lubricating structure 108 of the tappet 91 according to the eighth embodiment will be described with reference to FIG.

A lubricating oil port 192 is provided on the lower side surface of the pump housing 1. The lubricating oil port 192 is further inclined toward the axial center in the obliquely downward direction and penetrates from the outer peripheral surface to the inner peripheral surface.
Further, a tappet pin 196 is horizontally mounted on the lower portion of the tappet 91, and a tappet roller 197 is rotatably supported on the outer periphery of the central portion in the axial direction of the tappet pin 196. The tappet pin 196 is provided with a tappet pin oil passage 195 that guides lubricating oil to a contact portion between the tappet roller 197 and the tappet pin 196.
The tappet pin oil passage 195 includes a first oil passage 195a and a second oil passage 195b. The first oil passage 195a is an oil passage for communicating the lower end of the lubricating oil port 192 and the second oil passage 195b. Parallel to the shaft center of the tappet pin 196, a hole is drilled from the side surface on the lubricating oil port 192 side to the central portion in the axial center direction, one end is opened in the side surface, and the other end communicates with the second oil passage 195b. The second oil passage 195b is pierced in the diameter direction at the central portion in the axial center direction of the tappet pin 196, and the first oil passage 195a and the second oil passage 195b communicate with each other inside the tappet pin 196.
Further, the end opening on the inner peripheral side of the lubricating oil port 192 is configured to communicate with the tappet pin oil passage 195 in a state where the tappet 91 is located at the bottom dead center. That is, the end opening on the inner peripheral side of the lubricating oil port 192 is opened at a position facing the side opening of the first oil passage 195a at the position where the tappet 91 is raised most.

  With this configuration, in the state where the tappet 91 is located at the top dead center, the inner peripheral surface opening of the pump housing 1 at the lower end of the lubricating oil port 192 is the same as the side opening of the first oil passage 195a. Since the lubricating oil flows only in this case, the lubricating oil can be injected into the tappet 91 only when the pressure of the plunger 4 is applied. When the tappet 91 is lowered, the opening of the lubricating oil port 192 is closed. Yes.

Next, the structure different from the first embodiment of the lubricating structure 109 of the tappet 91 according to the ninth embodiment will be described with reference to FIG.
Further, the tappet pin oil passage 195, the tappet pin 196, and the tappet roller 197 have the same configuration as that of the eighth embodiment, and thus the description thereof is omitted.

  The lubricating oil port 202 provided in the pump housing 1 includes a first lubricating oil port 202a, a second lubricating oil port 202b, and a third lubricating oil port 202c. The first lubricating oil port 202a is drilled from the lower side surface of the pump housing 1 to the direction perpendicular to the vertical direction, that is, to the middle in the thickness direction without penetrating in the radial direction. The second lubricating oil port 202b is drilled from the lower surface of the pump housing 1 toward the bottom side of the first lubricating oil port 202a (upward), and the upper end of the second lubricating oil port 202b is the back of the first lubricating oil port 202a. Communicated with the side. The third lubricating oil port 202c is opened toward the inner peripheral surface of the pump housing 1 in the middle of the second lubricating oil port 202b, and this opening position is in a state where the tappet 91 is located at the bottom dead center. This is a position facing the side opening of the first oil passage 195a of the tappet pin 196, and allows the lubricating oil to flow in from the side surface of the tappet pin 196 when the tappet 91 rises and pressure is applied to the plunger 4.

  Further, a pressure regulating valve 210 for adjusting the pressure of the lubricating oil is provided at the lower end of the second lubricating oil port 202b. The pressure regulating valve 210 is opened when the pressure of the lubricating oil rises above the set hydraulic pressure, and discharges the lubricating oil to the cam chamber 501. In the state where the third lubricating oil port 202c and the first oil passage 195a communicate with each other, the hydraulic pressure of the lubricating oil becomes lower than the set pressure, so that the pressure regulating valve 210 is closed and flows from the third lubricating oil port 202c to the tappet pin 196. .

  With this configuration, since the lubricating oil flows only when the lubricating oil port 202 and the first oil passage 195a communicate with each other, the lubricating oil to the tappet 91 is injected only when the pressure of the plunger 4 is applied. it can. Further, the pressure of the plunger 4 can be adjusted by the pressure regulating valve 210, and the lubricating oil port 202 can be depressurized except when lubricating oil is injected.

  Next, a configuration in which a valve body that opens and closes the lubricating oil port 92 is provided in the middle of the lubricating oil port 92 and the valve body is opened and closed according to the raising and lowering of the tappet 91 will be described.

Next, the lubricating structure 110 of the tappet 91 according to the tenth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

  A relief valve 220 is provided in the middle in the thickness direction of the lubricating oil port 92 provided in the pump housing 1. The relief valve 220 includes a valve body 220a and an urging spring 220b, and is housed in a relief valve chamber 221 provided in the pump housing 1 in the vertical direction so as to be orthogonal to the lubricating oil port 92. The lower part of the relief valve chamber 221 is sealed by a sealing member 222 such as a screw, and is fixed to the pump housing 1 from below so as to press the valve body 220a upward by the biasing force of the biasing spring 220b. A communication path 223 is formed between the upper part of the relief valve chamber 221 and the spring chamber 28, and the upper end of the communication path 223 is provided above the top dead center of the tappet 91. In addition, the valve body 220a is formed with a constricted portion in the middle of the upper and lower parts. When the valve body 220a is pushed upward by the urging force of the urging spring 220b, the lubricating oil port 92 is closed and the pressure in the spring chamber 28 is When the valve body 220a descends against the urging force of the urging spring 220b, the constricted portion is located at a position facing the lubricating oil port 92 and opens.

  That is, with the above-described configuration, when the tappet 91 rises, the pressure in the spring chamber 28 rises, and the pressure is applied to the valve body 220a via the communication path 223 to resist the biasing force of the biasing spring 220b. Thus, the valve body 220a is lowered and the relief valve 220 is opened. When the relief valve 220 is opened, the lubricating oil flows from the lubricating oil port 92 to the tappet pin oil passage 95 through the tappet peripheral oil passage 93 and lubricates the tappet roller 97. Thus, the lubricating oil to the tappet 91 can be injected only when the pressure is applied to the plunger 4, and the lubricating oil that rises from between the pump housing 1 and the tappet 91 and enters the pump housing 1 can be reduced. it can. When the tappet 91 is lowered, the pressure in the spring chamber 28 is reduced, the pressure is released through the communication passage 223, the valve body 220a is raised by the urging force of the urging spring 220b, the relief valve 220 is closed, and lubrication is performed. Lubricating oil does not flow from the oil port 92.

Next, the structure different from the first embodiment of the lubricating structure 111 of the tappet 91 according to the eleventh embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

  A partition plate 230 serving as a valve body that opens and closes the lubricating oil port 92 by raising and lowering the tappet 91 is provided in a middle portion in the thickness direction of the lubricating oil port 92 provided in the pump housing 1. The partition plate 230 is made of a plate material having a width wider than the opening area of the lubricating oil port 92, and closes the lubricating oil port 92 when the tappet 91 is lowered. The upper portion of the partition plate 230 is bent at a substantially right angle and extended into the spring chamber 28 to form a locking portion 230a so that it can be locked to the upper end of the tappet 91. In order to accommodate the partition plate 230 in the middle of the lubricating oil port 92 so as to be movable up and down, the sliding hole 231 is formed vertically so as to be orthogonal to the lubricating oil port 92 of the pump housing 1. Yes. The upper portion of the sliding hole 231 is opened so that the opening 231 a communicates with the inside of the spring chamber 28, and the locking portion 230 a is disposed in the opening 231 a so as to face the spring chamber 28. The opening 231a is provided in an ascending / descending range at the upper end of the tappet 91, and is configured so that the locking portion 230a can be elevated. The lower end of the partition plate 230 is positioned higher than the upper end of the lubricating oil port 92 at the position where the tappet 91 is raised most.

  With this configuration, when the tappet 91 rises, the partition plate 230 locked to the upper end of the tappet 91 also rises, and the lubricating oil port 92 is opened in the vicinity of the lowest lowered position. The lubricating oil flows from 92 to the tappet pin oil passage 95 through the tappet peripheral oil passage 93 and the lubricating oil to the tappet 91 can be injected only when pressure is applied to the plunger 4. Lubricating oil that rises from the middle and enters the pump housing 1 can be reduced. Further, when the tappet 91 is lowered, the partition plate 230 is also lowered by its own weight, the lubricating oil port 92 is closed, and the lubricating oil is not flowed from the lubricating oil port 92.

Next, a lubricating structure 112 of the tappet 91 according to the twelfth embodiment will be described with reference to FIG.
Further, the tappet pin oil passage 195, the tappet pin 196, and the tappet roller 197 have the same configuration as that of the eighth embodiment, and thus the description thereof is omitted.

  The lubricating oil port 242 provided in the pump housing 1 includes an inflow port 242a, a discharge port 242b, and a guide groove 242c. The inflow port 242a is drilled from the lower side surface of the pump housing 1 to a middle portion in the thickness direction in a direction orthogonal to the vertical direction. The discharge port 242b is an oil passage that connects the inflow port 242a and the guide groove 242c. The discharge port 242b is inclined from the inner part of the inflow port 242a toward the inside and downward, and communicates with the upper end of the guide groove 242c. The guide groove 242c is formed in a groove shape in the vertical direction in the lower part of the inner peripheral surface of the pump housing 1 in parallel with the axis of the tappet 91, and is configured such that the inner side is opened from the lower end of the discharge port 242b to the lower end of the pump housing 1. Yes.

  At the lower end of the tappet 91, a lid 245 having the same shape and alignment as the guide groove 242c in plan view is provided so as to protrude in the horizontal direction. That is, the lid 245 is formed integrally with the tappet 91, and slides without being fitted into the guide groove 242c when the tappet 91 is lifted. The upper end position of the guide groove 242c is configured to close the lower end of the discharge port 242b at the top dead center where the lid 245 is lifted together with the tappet 91. Thereby, when the tappet 91 is at the top dead center in the vertical sliding, the lubricating oil is not discharged from the lower end of the guide groove 242c until the tappet 91 descends from the upper dead center and reaches the lower end of the guide groove 242c. The lubricating oil is supplied to the inside of the tappet roller 197 via the first oil passage 195a and the second oil passage 195b of the tappet pin 196. When the guide groove 242c is further lowered below the lower end of the guide groove 242c, the lubricating oil is discharged from the lower end of the guide groove 242c to the cam chamber 501.

  With this configuration, when the tappet 91 is at the top dead center in the vertical sliding, the pressure of the plunger 4 is applied, and at this time, the lower end of the discharge port 242b is closed with the lid 245 so that the lubricating oil does not flow. Lubricating oil will not leak upward.

Next, a lubricating structure 113 of the tappet 91 according to the thirteenth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

  A seal ring 250 is provided on the inner peripheral surface of the pump housing 1 so that the lubricating oil does not rise into the upper space from the gap with the tappet 91. The seal ring 250 is an annular seal on the inner peripheral surface of the pump housing 1 above the lubricating oil port 92 and lower than the upper end of the tappet 91 in a state where the tappet 91 is located at the bottom dead center. An insertion groove is formed, and the seal ring 250 is fitted into the seal insertion groove. The seal ring 250 is formed of resin or the like and is in close contact with the outer peripheral surface of the tappet 91.

  With this configuration, even when the lubricating oil rises due to the vertical sliding of the tappet 91, the seal ring 250 prevents the lubricating oil from entering the pump housing 1.

Next, the structure different from the thirteenth embodiment of the lubricating structure 114 of the tappet 91 according to the fourteenth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

Further, the tappet 91 is provided with an oil ring 260 on the outer peripheral surface in addition to the tappet peripheral oil passage 93 of the first embodiment so that the lubricating oil does not rise into the upper space from the gap with the pump housing 1. Is provided.
The oil ring 260 is formed with an annular oil ring insertion groove on the outer peripheral surface of the tappet 91 above the upper end of the lubricating oil port 92 in a state where the tappet 91 is located at the bottom dead center. The oil ring 260 is fitted into the insertion groove. The oil ring 260 is formed of resin or the like and is in close contact with the inner peripheral surface of the pump housing 1.

  With this configuration, even when the lubricating oil rises due to the vertical sliding of the tappet 91, the oil ring 260 prevents the lubricating oil from entering the pump housing 1.

Next, the lubricating structure 115 of the tappet 91 according to the fifteenth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

The tappet 91 configured to have a concave shape in cross-sectional view is provided with an oil discharge port 270 penetrating from the inner bottom portion to the outer peripheral surface. The oil discharge port 270 communicates with the upper end of a lubricating oil discharge groove 271 formed on the outer periphery of the tappet 91 in the vertical direction.
Further, in the state where the tappet 91 is located at the bottom dead center in the up-and-down sliding, the lubricating oil discharge port 272 is provided in the pump housing 1 at a position facing the oil discharge port 270 so as to penetrate in the radial direction. The upper end of the lubricating oil discharge groove 271 provided in the tappet 91 is the same height as the lubricating oil discharge port 272 when the tappet 91 is located at the bottom dead center, and the lower end of the lubricating oil discharge groove 271 is the tappet. When 91 is located at the top dead center, it is formed to have the same height as the lubricating oil discharge port 272. Further, the opening outside the lubricating oil discharge port 272 communicates with the upper end of the lubricating oil discharge oil passage 273 provided in a groove shape in the vertical direction on the outer periphery of the pump housing 1, and the lower end of the lubricating oil discharge oil passage 273 is the pump. It extends to the lower end of the housing 1.

With this configuration, when the tappet 91 moves up and down and the lubricating oil is lifted from the gap between the tappet 91 and the pump housing 1 and enters the tappet 91 and accumulates at the bottom, the lubricating oil is drained. The oil is discharged from the port 270 to the lubricating oil discharge port 272 through the lubricating oil discharge groove 271 and further dropped from the lubricating oil discharge oil passage 273 to the cam chamber 501.
In this manner, the lubricating oil that has entered the tappet 91 is discharged through the oil discharge port 270, so that the lubricating oil in the pump housing 1 can be reduced.

Next, the lubricating structure 116 of the tappet 91 according to the sixteenth embodiment will be described with reference to FIG.
The tappet pin oil passage 95 includes a first oil passage 95a, a second oil passage 95b, and a third oil passage 95c of the first embodiment, and the lubricating oil retention portion 95d of the first embodiment is not provided.

  The upper portion of the tappet 91 is longer than the tap lift 91 of the first embodiment by at least twice the cam lift amount. In other words, the vertical length D from the upper end of the side wall of the tappet 91 to the upper end of the tappet circumferential oil passage 93 is at least twice the lift amount d of the tappet 91.

  With this configuration, the position of the upper end of the outer peripheral surface of the side wall of the tappet 91 at the bottom dead center of the tappet 91 that slides up and down is higher than the position of the upper end of the tappet peripheral oil passage 93 at the top dead center of the tappet 91. Since it is located above the amount d or more, even when the lubricating oil rises due to the contact between the outer peripheral surface of the tappet 91 and the inner peripheral surface of the pump housing 1, the tappet 91 exceeds the outer peripheral surface of the tappet 91 and enters the pump housing 1. Infiltration can be prevented.

DESCRIPTION OF SYMBOLS 1 Pump housing 2 Plunger barrel 3 Plunger insertion hole 4 Plunger 6 Cam shaft 7 Cam 91 Tappet 92 Lubricating oil port 93 Tappet peripheral oil path 94 Tappet internal oil path 95 Tappet pin oil path 96 Tappet pin 97 Tappet roller 95d Lubricating oil retention part

Claims (8)

A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
One end of a tappet oil passage portion that guides lubricating oil from the outer periphery of the tappet to an insertion hole for inserting a tappet pin that supports the tappet roller is communicated with the lubricating oil port, and the other end of the tappet oil passage portion is formed on the tappet pin. A fuel injection pump, characterized in that a lubricating oil retaining portion is provided between a tappet pin and a tappet roller at the other end of the tappet pin oil passage in communication with the tappet pin oil passage.   The fuel injection pump according to claim 1, wherein the lubricating oil retention portion communicates with an oil passage that guides the lubricating oil to the outside of the pump housing. A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower portion and reciprocally slides the plunger, and a lower side surface of the pump housing lubricating oil port 202 g. In a fuel injection pump comprising a lubricating oil port for supplying lubricating oil to a surface,
In a state where the tappet is located at the bottom dead center, an annular collection groove is formed in at least one of the pump housing or the tappet located above the lubricating oil port, and the collection groove is formed outside the pump housing. A fuel injection pump characterized in that it communicates with a communicating lubricating oil discharge passage. A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
A fuel injection pump characterized in that the lubricating oil port and an oil passage for supplying lubricating oil from the outer periphery of the tappet to the rotational sliding surface of the tappet roller communicate with each other at the ascending position of the tappet and close at the descending position. . A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
A fuel injection pump characterized in that a pressure regulating valve for adjusting the pressure applied to the lubricating oil is provided in the middle of the lubricating oil port. A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
A fuel injection pump characterized in that a valve body for opening and closing the lubricating oil port is provided in the middle of the lubricating oil port, and the valve body is opened and closed according to the raising and lowering of the tappet. A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
The lubricating oil port forms a discharge port that opens downward, and a lid is provided at the lower end of the tappet in accordance with the position of the discharge port. A fuel injection pump configured to close the discharge port. A plunger that pumps fuel, a plunger barrel that houses the plunger, a tappet that is connected to the plunger barrel and a lower portion of the plunger, and a spring that biases the tappet toward the cam; and A cam that abuts a tappet roller that is rotatably supported at the lower part and reciprocally slides the plunger, and is provided on the lower side surface of the pump housing, and lubricates the sliding surface of the tappet and the rotational sliding surface of the tappet roller. A fuel injection pump comprising: a lubricating oil port to be supplied;
A fuel injection pump characterized in that, in a state where the tappet is located at the bottom dead center, the side wall of the tappet above the lubricating oil port is configured to be at least twice the lift amount by the cam.

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