JP5396313B2 - diesel engine - Google Patents

Description

  The present invention relates to a diesel engine, and more particularly, to a diesel engine that can suppress a problem that engine oil enters a fuel injection pump.

Conventionally, as a diesel engine, a fuel injection pump is housed in an injection pump housing case as in the present invention, a fuel injection camshaft is installed below the fuel injection pump, and engine oil flows into the inner bottom of the injection pump housing case. There is something like that.
According to this type of diesel engine, the engine oil that has flowed into the inner bottom portion of the injection pump housing case is lifted to the fuel injection pump side by the fuel injection cam, and the sliding portion between the fuel injection cam and the fuel injection pump can be lubricated. There is.
However, this prior art has a problem because there is no means for limiting the lifting of engine oil by the fuel injection cam.

Japanese Unexamined Patent Publication No. 2000-104592 (see FIG. 1)

<Problem> There is a problem that engine oil enters the fuel injection pump.
Since there is no means for limiting the lifting of the engine oil by the fuel injection cam, a large amount of engine oil is lifted to the fuel injection pump side by the fuel injection cam, and there is a problem that the oil enters the fuel injection pump.

  The subject of this invention is providing the diesel engine which can suppress the malfunction which engine oil approachs into a fuel injection pump.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIGS. 1, 2A, and 2B, a fuel injection pump (2) is accommodated in an injection pump housing case (1), and a fuel injection camshaft (under the fuel injection pump (2)). In the diesel engine in which 3) is installed and the engine oil (14) flows into the inner bottom of the injection pump housing case (1),
An oil cut portion (18) is formed on the inner peripheral surface of the injection pump housing case (1),
As illustrated in FIGS. 1, 2A, and 2B, the oil cut portion (18) extends along the circumferential surface of the fuel injection cam (34), and the oil cut portion (18) is connected to the cam separating portion (18a). ) And a cam proximity edge (18b), the cam separation portion (18a) is separated from the peripheral surface of the fuel injection cam (34), and the cam proximity edge (18b) is a periphery of the fuel injection cam (34). Formed at the edge of the cam separation portion (18a) adjacent to the edge (34a) of the surface,
A part of engine oil (14) which is about to be lifted to the fuel injection pump (2) side on the peripheral surface of the fuel injection cam (34) is cut off by an oil cut portion (18). Diesel engine.

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> It is possible to suppress a problem that the engine oil enters the fuel injection pump.
As illustrated in FIGS. 1, 2 (A) and 2 (B), a part of the engine oil (14) which is about to be lifted toward the fuel injection pump (2) on the peripheral surface of the fuel injection cam (34) is oil. Since the oil is cut off at the cut portion (18), the amount of engine oil (14) lifted to the fuel injection pump (2) side by the fuel injection cam (34) is limited, and the fuel injection pump (2) The problem that the engine oil (14) enters can be suppressed.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The oil delivery port and the oil cut recess can be processed in series.
As illustrated in FIG. 2 (B), the cam separating portion (18a) of the oil cut portion (18 ) is formed on the peripheral wall (1a) of the injection pump housing case (1) that is continuous with the partition wall (17). Since the port (64) and the cam separation portion (18a) are formed in series, the oil delivery port (64) and the cam separation portion (18a) are processed in series by a series of die cutting, a series of cutting, and the like. be able to.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> Engine oil is prevented from entering the feed pump chamber.
As illustrated in FIG. 2 (A), a protrusion (58) formed at the boundary between the inner bottom of the injection pump housing case (1) and the rocker arm insertion passage (54) is a lateral oil passage groove (59). Even if the engine oil (14) in the inner bottom portion of the injection pump housing case (1) enters the pump interlocking portion housing passage (52), the engine oil (14) remains in the injection pump housing case ( The engine oil (14) is prevented from entering the feed pump chamber (51) immediately returning to the inner bottom of 1).

  When the ridge (58) is not thinned by the lateral oil passage groove (59), the engine oil (14) in the inner bottom portion of the injection pump housing case (1) is housed in the pump interlocking portion by the vibration of the engine. When entering the passage (52), it is difficult to return to the inner bottom of the injection pump housing case (1), the oil level of the engine oil (14) in the pump interlocking portion housing passage (52) rises, and the engine oil (14) feeds. There is a problem of entering the pump chamber (51), but when the ridge (58) is thinned by the lateral oil passage groove (59), the engine oil (14 ) Immediately returns to the inner bottom of the injection pump housing case (1), and such a problem does not occur. It is presumed that the lateral oil passage groove (59) helps return the engine oil (14) from the pump interlocking portion accommodating passage (52) to the inner bottom portion of the injection pump accommodating case (1).

(Invention of Claim 4)
The invention according to claim 4 has the following effect in addition to the effect of the invention according to claim 3.
<Effect> It is possible to easily form the oil outflow passage and communicate with the inner bottom portion of the injection pump housing case.
As illustrated in FIGS. 1, 2 </ b> A and 2 </ b> B, the oil outflow passage (20) of the injection pump storage case (1) extends from the end wall (23) of the injection pump storage case (1). An oil outflow hole (20a) is provided in the bottom wall (28) of the injection pump case (1) by a drilling process that goes straight along the inner bottom surface of (1), and this oil outflow hole (20a) Since it communicates with the inner bottom portion of the injection pump housing case (1) via the lateral oil passage groove (59) provided in the bottom wall (28) of the injection pump housing case (1), the oil outflow passage (20 ) Can be easily communicated with the inner bottom of the injection pump housing case (1).

(Invention according to claim 5)
The invention according to claim 5 has the following effect in addition to the effect of the invention according to claim 4.
<Effect> The engine oil is prevented from entering the fuel injection pump by lifting the engine oil of the fuel injection cam.
As illustrated in FIGS. 1, 2A, and 2B, the second oil in which the oil outflow passage (20) of the injection pump housing case (1) is arranged side by side with the oil outflow hole (20a). The second oil outflow hole (20b) is provided with an outflow hole (20b), and the second oil outflow hole (20b) advances straight from the end wall (23) of the injection pump housing case (1) along the inner bottom surface of the injection pump housing case (1). Since it is provided in the bottom wall (28) of the injection pump case (1) by drilling, even if the engine is inclined to the left or right, injection is performed from the lower of the pair of oil outflow holes (20a) (20b) The engine oil (14) in the pump housing case (1) can be discharged to the timing transmission gear case (11), and a large amount of engine oil (14) does not accumulate in the injection pump housing case (1). For this reason, the fuel injection cam (34) is not deeply immersed in the engine oil (14), and the entry of the engine oil (14) into the fuel injection pump (2) due to the lifting of the engine oil (14) of this cam is suppressed. Is done.

<Effect> It is possible to easily form the oil outflow passage and communicate with the inner bottom portion of the injection pump housing case.
As illustrated in FIGS. 1, 2A, and 2B, the second oil in which the oil outflow passage (20) of the injection pump housing case (1) is arranged side by side with the oil outflow hole (20a). The second oil outflow hole (20b) is provided with an outflow hole (20b), and the second oil outflow hole (20b) advances straight from the end wall (23) of the injection pump housing case (1) along the inner bottom surface of the injection pump housing case (1). It is provided in the bottom wall (28) of the injection pump case (1) by drilling, and this second oil outflow hole (20b) is provided in the lateral direction provided in the bottom wall (28) of the injection pump housing case (1). Since it communicates with the inner bottom of the injection pump housing case (1) via the second oil passage groove (61), the oil outflow passage (20) and the inner bottom of the injection pump housing case (1) Communication is easy.

(Invention of Claim 6)
The invention according to claim 6 has the following effect in addition to the effect of the invention according to claim 5.
<Effect> It is possible to prevent the formation of a lateral oil passage groove.
As illustrated in FIG. 2A, a lateral oil passage groove (59) and a second oil passage groove (61) are formed in the rocker arm insertion passage (54) from the outside of the injection pump housing case (1). Since it is formed by a series of drilling of a drill that goes straight toward the inner bottom of the injection pump housing case (1), the tip of the drill has the second oil passage groove (61) at the time of drilling. It is necessary to let the drill enter until it hits the bottom wall (28) of the injection pump housing case (1), and the oil passage groove (59) is mistakenly formed because the lateral oil passage groove (59) is not opened due to insufficient penetration of the drill. Can be prevented.

<Effect> The number of drilling steps can be reduced.
As illustrated in FIG. 2A, a lateral oil passage groove (59) and a second oil passage groove (61) are formed in the rocker arm insertion passage (54) from the outside of the injection pump housing case (1). Since it is formed by a series of drilling processes that go straight toward the inner bottom of the injection pump housing case (1), the number of drilling processes can be reduced.

(Invention of Claim 7)
The invention according to claim 7 has the following effects in addition to the effects of the invention according to any one of claims 1 to 6.
<Effect> It is possible to prevent the fuel injection cam from becoming insufficiently lubricated even when the engine is inclined downward toward the rolling bearing.
As illustrated in FIG. 1, when the end of the fuel injection camshaft (3) is supported on the end of the injection pump housing case (1) via the rolling bearing (41), the rolling bearing (41 ) Is provided along the end face of the roller, and when the engine is inclined downward toward the rolling bearing (41), the clearance (41a) between the races of the rolling bearing (41) from the injection pump housing case (1) is provided. The engine oil (14) about to flow out via the oil blocking wall (24) is blocked by the oil blocking wall (24), so that even if the engine is inclined downward toward the rolling bearing (41), the fuel injection cam (34) Can be prevented from becoming insufficiently lubricated.

(Invention of Claim 8)
The invention according to claim 8 has the following effect in addition to the effect of the invention according to claim 7.
<Effect> The engine oil is prevented from entering the fuel injection pump by lifting the engine oil of the fuel injection cam.
As illustrated in FIG. 1, when the oil splashing means (26) is provided near the end of the fuel injection camshaft (3) and the engine is inclined downward toward the rolling bearing (41), the injection pump is accommodated. Since the engine oil (14) accumulated near the end of the case (1) is splashed into the injection pump housing case (1) by the oil splashing means (26), the end of the injection pump housing case (1) A large amount of engine oil (14) does not accumulate in the part. For this reason, the fuel injection cam (34) is not deeply immersed in the engine oil (14), and the engine oil (14) to the fuel injection pump (2) is lifted by lifting the engine oil (14) of the fuel injection cam (34). ) Is suppressed.

(Invention according to claim 9)
In addition to the effect of the invention according to the eighth aspect, the following effect can be obtained.
<Effect> It is easy to attach the oil jumping means to the fuel injection camshaft.
As illustrated in FIGS. 7 and 8, a plurality of oil splashing means (26) are provided at the outer peripheral edge of the circlip (26a) attached to the end of the fuel injection camshaft (3). Due to the spring blade (26b), it is easy to attach the oil spring means (26) to the fuel injection camshaft (3).

It is a fuel injection pump unit vertical side view used with the diesel engine which concerns on embodiment of this invention. 2A is a cross-sectional view of the fuel injection pump unit of FIG. 1, FIG. 2A is a cross-sectional view taken along line IIA-IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. FIG. 3A is a longitudinal front view of a mechanical governor used in the fuel injection pump unit of FIG. 1, and FIG. 3B is a longitudinal front enlarged view of a pivot portion of a governor lever. FIG. 4A is a front view and FIG. 4B is a side view for explaining an injection pump housing case used in the fuel injection pump unit of FIG. 1. It is a rear view of the injection pump storage case used with the fuel injection pump unit of FIG. 1 is a schematic plan view of a diesel engine according to an embodiment of the present invention. It is a vertical side view of the principal part when the engine of FIG. 6 inclines down to the front side. FIG. 8A is a front view of the oil splashing means used in the fuel injection pump unit of FIG. 1, and FIG. 8B is a cross-sectional view taken along line BB of FIG. 8A.

  Embodiments of the present invention will be described with reference to the drawings. 1 to 8 are diagrams for explaining a diesel engine according to an embodiment of the present invention. In this embodiment, a vertical multi-cylinder diesel engine will be explained.

The outline of the embodiment of the present invention is as follows.
As shown in FIG. 6, the cylinder head (31) is attached to the upper part of the cylinder block (30), and the timing transmission gear case (11) is attached to the front part of the cylinder block (30). The lateral end portion (31) of the timing transmission gear case (11) protrudes laterally from the lateral side surface (32) of the cylinder block (30), and fuel is placed on the rear wall (48) of the lateral end portion (31). An injection pump unit (33) is attached.

The outline of the embodiment of the present invention is as follows.
As shown in FIG. 6, the cylinder head (31) is attached to the upper part of the cylinder block (30), and the timing transmission gear case (11) is attached to the front part of the cylinder block (30). The lateral end portion (31) of the timing transmission gear case (11) protrudes laterally from the lateral side surface (32) of the cylinder block (30), and fuel is placed on the rear wall (48) of the lateral end portion (31). An injection pump unit (33) is attached.

The configuration of the fuel injection pump unit is as follows.
The fuel injection pump unit (33) includes an injection pump storage case (1), a governor storage case (4), its internal components, and a fuel injection cam gear (12).
As shown in FIG. 1, a fuel injection pump (2) is accommodated in an injection pump housing case (1), and a fuel injection camshaft (3) is installed below the fuel injection pump (2), and an injection pump housing case. (1) A governor accommodating case (4) is provided on the rear end side, a mechanical governor (5) is accommodated in the governor accommodating case (4), and a governor weight is disposed on the rear end side of the fuel injection camshaft (3). (6) is attached, and the governor force input portion (8) of the governor lever (7) is linked to the governor weight (6), and the fuel adjustment of the fuel injection pump (2) is connected to the output portion (9) of the governor lever (7). The quantity portion (10) is interlocked, the front end side of the injection pump housing case (1) is attached to the timing transmission gear case (11), and the fuel injection cam gear (12) is attached to the front end side of the fuel injection cam shaft (3). The fuel injection cam gear (12) is accommodated in the timing transmission gear case (11). Yes.

  As shown in FIG. 1, the fuel injection pump (2) is a row injection pump provided with a plunger, and the fuel injection cam shaft (3) has four fuel injection cams (34) and one fuel feed cam ( 35). The rear end portion of the fuel injection cam shaft (3) protrudes into the governor housing case (4), and the governor weight (6) is swingably attached to the rear end portion via a weight holder (36). The governor sleeve (37) is slidably mounted back and forth, and the swing of the governor weight (6) is transmitted to the governor force input portion (8) of the governor lever (7) through the back and forth slide of the governor sleeve (37). It has come to be. The fuel metering portion (10) of the fuel injection pump (2) is interlockedly connected to the output portion (9) of the governor lever (7) via the interlocking plate (38). The fuel metering unit (10) is a fuel metering rack. The fuel injection cam gear (12) is fitted and fixed to the front end portion of the fuel injection cam shaft (3), and is driven from the crank gear (not shown) of the crankshaft (not shown) via the idle gear (39). The timing transmission gear train (29) including the crank gear, the idle gear (39), and the fuel injection cam gear (12) is accommodated in the timing transmission gear case (11).

As shown in FIGS. 4 (A) and 4 (B), the front end wall (23) of the injection pump housing case (1) is provided with an annular fitting portion (65), as shown in FIG. The annular fitting portion (65) is fitted into the fitting hole (66) of the rear wall (48) of the timing transmission gear case (11), and the fuel injection pump unit (33) is timed transmission with a predetermined inclination. It is fixed to the rear wall (48) of the gear case (11).
As shown in FIG. 2, the fuel injection pump unit (33) of this embodiment is fixed to be inclined toward the fuel feed pump (25).

As shown in FIG. 3, the engine oil (14) in the oil pan (13) is supplied to the governor lever (7) by the pumping force of the oil pump (15), and as shown in FIG. The oil delivery port (64) of the governor housing case (4) is provided in the partition wall (17) between the (4) and the injection pump housing case (1), and the jet pump housing case (1) and the timing transmission gear case (11) are provided. The oil outflow passage (20) of the pump housing case (1) is provided between the two.
As shown in FIG. 1, the engine oil (14) dropped from the governor lever (7) to the inner bottom of the governor housing case (4) is transferred to the oil delivery port (64) of the governor housing case (4) shown in FIG. 1 flows into the inner bottom portion of the pump housing case (1) through the inter-race gap (40a) of the rear rolling bearing (40) shown in FIG. 1, and then through the oil outflow passage (20) of the pump housing case (1). Then, it flows into the timing transmission gear case (11) and returns to the oil pan (13).

  As shown in FIG. 2, the oil delivery port (64) of the governor housing case (1) is provided on both sides of the rear rolling bearing (40) for bearing the fuel injection cam shaft (3). Reference numeral (41) in FIG. 1 denotes a front rolling bearing for bearing the fuel injection camshaft (3). These front and rear rolling bearings (40) and (41) are all ball bearings.

The lubrication structure of the governor lever is as follows.
As shown in FIG. 3A, a governor lever pivot (42) is installed in the governor housing case (4), a boss (45) is attached to the governor lever (7), and bushes ( 49) is fitted internally, and the boss (45) is fitted externally to the governor lever pivot (42) to constitute the pivot (16). As shown in FIG. 3 (B), the governor lever pivot (42) is provided with an in-shaft oil passage (43) along its central axis, and the engine oil (14) in the oil pan (13) is sent to the oil pump (15). ) Is supplied to the in-shaft oil passage (43). A central portion in the axial direction of the governor lever pivot (42) is a small diameter portion (44), and an oil supply gap (46) is provided between the small diameter portion (44) and the boss (45), and the small diameter portion (44) An oil outflow hole (47) is provided in the radial direction, the oil outflow hole (47) communicates with the oil passage (43) in the shaft and the oil supply gap (46), and the oil outflow hole (47) from the oil passage (43) in the shaft. ) Through the oil supply gap (46). The engine oil (14) supplied to the oil supply gap (46) passes through the gap between the governor lever pivot (42) and the bush (49) and falls to the inner bottom of the governor housing case (4).

  The governor lever (7) is composed of a first lever (7a) and a second lever (7b). The first lever (7a) is connected to the governor lever (7c), and the second lever (7b) is a governor. Receive power. The boss (45) is slidably supported on the governor lever pivot (42), and the bush (49) is fixed to the boss (45) by an interference fit, and is not in contact with the governor lever pivot (42). The first lever (7a) is fixed to the boss (45) by an interference fit, and the second lever (7b) is slidably supported by the bush (49).

As shown in FIGS. 1, 2A and 2B, an oil cut portion (18) is formed on the inner peripheral surface of the injection pump housing case (1), and this oil cut portion (18) is formed into a fuel injection cam ( 34), the oil cut portion (18) includes a cam separation portion (18a) and a cam proximity edge portion (18b), and the cam separation portion (18a) is a circumferential surface of the fuel injection cam (34). The cam proximity edge portion (18b) is formed by the end edge portion of the cam separation portion (18a) adjacent to the end edge portion (34a) of the peripheral surface of the fuel injection cam (34). 34) A part of the engine oil (14) to be lifted to the fuel injection pump (2) side is cut off by the oil cut portion (18).

As shown in FIGS. 2 (A) and 2 (B), an oil reservoir chamber (19) is provided adjacent to the injection pump housing case (1), and the oil reservoir chamber (19) and the injection pump housing case (1) are separated from each other. The partition wall (17) is provided with an oil delivery port (64) so that the engine oil (14) accumulated in the oil reservoir chamber (19) is delivered from the oil delivery port (64) to the injection pump housing case (1). in configuring the partition wall (17) and the cam separating portion of the oil cut portion (18) (18a) are formed in the peripheral wall (1a) of the injection pump housing case successive (1), the oil transfer port (64) cam spaced A portion (18a) is formed in series. The oil sump chamber (19) is composed of a governor housing case (4).
The oil delivery port (64) and the oil cut recess (21) are formed in series by a series of die cutting during casting.

  As shown in FIG. 2, a fuel feed pump (see FIG. 2) for supplying fuel to the fuel injection pump (2) beside the injection pump housing case (1) when viewed in a direction parallel to the installation direction of the fuel injection cam shaft (3). 25) is arranged, a pump interlocking portion accommodating passage (52) is disposed below the feed pump chamber (51) of the fuel feed pump (25), and a rocker arm mounting passage (next to the pump interlocking portion accommodating passage (52)) 53) is disposed, a rocker arm insertion passage (54) of the injection pump housing case (1) is disposed beside the rocker arm mounting passage (53), and the pump interlocking portion housing passage (52) is ejected from the rocker arm mounting passage (53). The pump housing case (1) communicates with the inner bottom portion of the injection pump housing case (1) via the rocker arm insertion passage (54).

As shown in FIG. 2, the rocker arm (55) attached to the rocker arm attachment passage (53) is inserted into the injection pump housing case (1) via the rocker arm insertion passage (54), and the fuel injection camshaft (3). The pump operating portion (57) of the feed pump chamber (51) is driven from the fuel feed cam (35) through the rocker arm (55) and the pump interlocking portion (56) in the pump interlocking portion receiving passage (52).
In doing so, the protrusion (58) formed at the boundary between the inner bottom of the injection pump housing case (1) and the rocker arm insertion passage (54) is thinned by the lateral oil passage groove (59). .

  The lateral oil passage groove (59) and the second oil passage groove (61) are formed at the inner bottom of the injection pump housing case (1) from the outside of the injection pump housing case (1) through the rocker arm insertion passage (54). It is formed by a series of drilling of the drill that goes straight toward the.

  As shown in FIGS. 1, 2A and 2B, the oil outflow passage 20 of the injection pump storage case 1 is connected to the injection pump storage case (23) from the end wall 23 of the injection pump storage case 1. 1) An oil outflow hole (20a) provided in the bottom wall (28) of the injection pump case (1) is formed by a drilling process that advances straight along the inner bottom surface of the injection pump case (1). It communicates with the inner bottom of the injection pump housing case (1) through a lateral oil passage groove (59) provided in the bottom wall (28) of the pump housing case (1).

  As shown in FIGS. 1, 2A, and 2B, the oil outflow passage (20) of the injection pump housing case (1) is arranged side by side with the oil outflow hole (20a). A drill hole provided with a hole (20b), wherein the second oil outlet hole (20b) advances straight from the end wall (23) of the injection pump housing case (1) along the inner bottom surface of the injection pump housing case (1). The second oil outflow hole (20b) provided in the bottom wall (28) of the injection pump housing case (1) is provided in the bottom wall (28) of the injection pump case (1) by processing. It communicates with the inner bottom portion of the injection pump housing case (1) through the two oil passage grooves (61).

  As shown in FIG. 2 (A), the lateral oil passage groove (59) and the second oil passage groove (61) pass through the rocker arm insertion passage (54) from the outside of the injection pump housing case (1). It is formed by a series of drilling processes that go straight toward the inner bottom of the injection pump housing case (1).

  As shown in FIG. 1, when the end portion of the fuel injection camshaft (3) is supported by the end portion of the injection pump housing case (1) via the rolling bearing (41), the rolling bearing (41) is provided. An oil blocking wall (24) is provided along the end face of the injection pump, and when the engine is inclined downward to the rolling bearing (41) side, that is, the timing transmission gear case (11) side, the rolling bearing from the injection pump housing case (1) is provided. The engine oil (14) that is about to flow out to the timing transmission gear case (11) through the clearance (41a) between the races (41) is blocked by the oil blocking wall (24).

As shown in FIG. 1, an oil splashing means (26) is provided near the end of the fuel injection camshaft (3), and the engine descends to the rolling bearing (41) side, that is, the timing transmission gear case (11) side. When inclined, the engine oil (14) accumulated near the end of the injection pump housing case (1) is splashed into the injection pump housing case (1) by the oil splashing means (26).
As shown in FIGS. 7 and 8, the oil splashing means (26) is a plurality of oil jumping means provided on the outer peripheral edge of the circlip (26a) attached to the end of the fuel injection camshaft (3). It is a blade | wing (26b).

(1) Injection pump housing case
(2) Fuel injection pump
(3) Fuel injection camshaft
(14) Engine oil
(17) Bulkhead
(18) Oil drain
(19) Oil reservoir
(20) Oil outflow passage
(20a) Oil outflow hole
(20b) Second oil outflow hole
(21) Oil groove
(23) End wall
(24) Oil barrier
(25) Fuel feed pump
(26) Oil splashing means
(26a) Circlip
(26b) Oil jumping blade
(34) Fuel injection cam
(35) Fuel feed cam
(41) Rolling bearing
(41a) Clearance between races
(51) Feed pump room
(52) Pump interlocking section accommodation passage
(53) Rocker arm attachment passage
(54) Rocker arm insertion passage
(55) Rocker arm
(56) Pump interlocking part
(57) Pump actuator
(58) ridge
(59) Sideways oil passage groove
(61) Sideways second oil passage groove
(64) Oil delivery port

Claims (9)

A fuel injection pump (2) is stored in the injection pump storage case (1), a fuel injection camshaft (3) is installed below the fuel injection pump (2), and engine oil (14) is supplied to the injection pump storage case ( In a diesel engine that flows into the inner bottom of 1),
An oil cut portion (18) is formed on the inner peripheral surface of the injection pump housing case (1),
The oil cut portion (18) extends along the circumferential surface of the fuel injection cam (34), and the oil cut portion (18) includes a cam separating portion (18a) and a cam proximity edge portion (18b). 18a) is separated from the peripheral surface of the fuel injection cam (34), and the cam proximity edge portion (18b) is a cam separation portion (18a) adjacent to the end edge portion (34a) of the peripheral surface of the fuel injection cam (34). Formed at the edge of the
A part of engine oil (14) which is about to be lifted to the fuel injection pump (2) side on the peripheral surface of the fuel injection cam (34) is cut off by an oil cut portion (18). Diesel engine. The diesel engine according to claim 1,
An oil reservoir chamber (19) is provided adjacent to the injection pump storage case (1), and an oil delivery port (64) is provided in the partition wall (17) between the oil reservoir chamber (19) and the injection pump storage case (1). The engine oil (14) accumulated in the oil sump chamber (19) is delivered from the oil delivery port (64) to the injection pump housing case (1).
Partition wall (17) and the cam separating portion of the oil cut portion in the peripheral wall (1a) of the injection pump housing case successive (1) (18) (18a) is formed, an oil transfer port (64) and the cam spacing portion (18a) Diesel engine, characterized in that and are formed in a series. In the diesel engine according to claim 1 or 2,
A fuel feed pump (25) for supplying fuel to the fuel injection pump (2) is disposed beside the injection pump housing case (1) when viewed in a direction parallel to the installation direction of the fuel injection cam shaft (3). A pump interlocking portion accommodating passage (52) is disposed below the feed pump chamber (51) of the fuel feed pump (25), and a rocker arm mounting passage (53) is disposed beside the pump interlocking portion accommodating passage (52). A rocker arm insertion passage (54) of the injection pump housing case (1) is disposed beside the attachment passage (53), and the pump interlocking portion housing passage (52) is provided between the rocker arm attachment passage (53) and the injection pump housing case (1). Communicated with the inner bottom of the injection pump housing case (1) via the rocker arm insertion passage (54),
The rocker arm (55) attached to the rocker arm attachment passage (53) is inserted into the injection pump housing case (1) via the rocker arm insertion passage (54), and the fuel feed cam (35) of the fuel injection cam shaft (3). When the pump operating part (57) of the feed pump chamber (51) is driven through the rocker arm (55) and the pump interlocking part (56) in the pump interlocking part accommodating passage (52),
A protrusion (58) formed at the boundary between the inner bottom of the injection pump housing case (1) and the rocker arm insertion passage (54) is thinned by a lateral oil passage groove (59). diesel engine. The diesel engine according to claim 3,
The oil outlet passage (20) of the injection pump housing case (1) is jetted by a drilling process in which the oil outlet passage (20) goes straight along the inner bottom surface of the injection pump housing case (1) from the end wall (23) of the injection pump housing case (1) An oil outflow hole (20a) provided in the bottom wall (28) of the pump case (1) is provided, and the oil outflow hole (20a) is provided in the bottom wall (28) of the injection pump housing case (1). A diesel engine characterized in that it communicates with the inner bottom of the injection pump housing case (1) through a lateral oil passage groove (59). The diesel engine according to claim 4, wherein
The oil outlet passage (20) of the injection pump housing case (1) includes a second oil outlet hole (20b) arranged side by side with the oil outlet hole (20a). The second oil outlet hole (20b) ) In the bottom wall (28) of the injection pump case (1) by a drilling process that advances straight from the end wall (23) of the injection pump storage case (1) along the inner bottom surface of the injection pump storage case (1). Provided,
The second oil outflow hole (20b) is formed in the injection pump housing case (1) through a lateral second oil passage groove (61) provided in the bottom wall (28) of the injection pump housing case (1). A diesel engine characterized in that it communicates with the inner bottom. The diesel engine according to claim 5, wherein
The lateral oil passage groove (59) and the second oil passage groove (61) are formed at the inner bottom of the injection pump housing case (1) from the outside of the injection pump housing case (1) through the rocker arm insertion passage (54). Diesel engine characterized by being formed by a series of drilling of drills that go straight toward The diesel engine according to any one of claims 1 to 6,
When the end of the fuel injection camshaft (3) is supported by the end of the injection pump housing case (1) via the rolling bearing (41),
An oil blocking wall (24) is provided along the end surface of the rolling bearing (41), and when the engine is inclined downward toward the rolling bearing (41), the rolling bearing (41) is moved from the injection pump housing case (1). A diesel engine characterized in that engine oil (14) about to flow out through the inter-race gap (41a) is blocked by an oil blocking wall (24). The diesel engine according to claim 7,
An oil splashing means (26) is provided near the end of the fuel injection camshaft (3), and when the engine is inclined downward toward the rolling bearing (41), it is close to the end of the injection pump housing case (1). A diesel engine characterized in that the engine oil (14) accumulated in the engine is splashed into the injection pump housing case (1) by the oil splashing means (26). A diesel engine according to claim 8,
The oil splashing means (26) is a plurality of oil splashing blades (26b) provided on the outer peripheral edge of a circlip (26a) attached to the end of the fuel injection camshaft (3). Diesel engine.

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