JP2915648B2 - Mounting device for lubricating pump in internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mounting a lubricating oil pump for supplying lubricating oil to various operating parts in an internal combustion engine.

[0002]

2. Description of the Related Art Recent internal combustion engines are disclosed, for example, in Japanese Utility Model Laid-Open No. Sho 62-167961 and Japanese Utility Model Laid-Open No. 1-10883.
07 and the like, and as shown in FIG. 9, the lubricating oil pump 1 for the internal combustion engine is fitted to the shaft end 3 a of the crankshaft 3 on the side surface 2 a of the cylinder block 2. It is configured to be mounted.

The shaft end 3a of the crankshaft 3
A sprocket 5 for a power transmission timing chain (or a timing belt) 4 to a camshaft (not shown) and a pulley 6 for power transmission to engine accessories such as a cooling water pump and an alternator are fitted to the motor shaft. On the other hand, a cover case 7 that covers the timing chain 4 is coupled to the side surface 2a of the cylinder block 2.

[0004]

Accordingly, a sprocket 5 for the timing chain 4 and a power transmission pulley 6 for the engine accessory are fitted to the shaft end 3a of the crankshaft 3, and the side surface of the cylinder block 2 is provided. In the internal combustion engine in which the cover case 7 for the timing chain 4 is joined to 2a, the lubricating oil pump 1 is mounted on the side surface 2a of the cylinder block 2 so as to be fitted on the shaft end 3a of the crankshaft 3 as described above. In the configuration, A space must be ensured between the side surface 2a of the cylinder block 2 and the sprocket 5 for the timing chain so that the lubricating oil pump 1 is disposed. In other words, the sprocket 5 for the timing chain is Since the lubricating oil pump 1 must be separated from the side surface 2a of the cylinder block 2 by the thickness of the lubricating oil pump 1, the thickness of the cover case 7 increases, and the weight of the internal combustion engine increases. In addition, the maximum protrusion dimension L from the side surface 2a of the cylinder block 2 to the outer end surface of the pulley 6 increases, and the overall length of the internal combustion engine in the crankshaft direction increases. . As described above, the timing chain sprocket 5
Away from the side surface 2a of the cylinder block 2, the bending moment acting on the shaft end 3a of the crankshaft 3 for transmitting power from the crankshaft to the camshaft increases, and therefore the diameter of the shaft end 3a Must be increased, thereby increasing the diameters of the inner rotor and the outer rotor in the lubricating oil pump 1,
Since the power loss required to drive the lubricating oil pump 1 increases, the fuel consumption rate in the internal combustion engine deteriorates. . Since the lubricating oil pump 1 is located between the sprocket 5 for timing chain on the crankshaft 3 and the side surface 2a of the cylinder block 2, the lubricating oil pump 1 is only removed by removing the cover case 7. Cannot be disassembled, and maintenance of the lubricating oil pump is difficult. The problem was called.

The present invention solves these problems at once.
At the same time, make sure that lubricating oil
It is possible to reduce the
It is an object of the present invention to simplify the structure of the source.

[0006]

SUMMARY OF THE INVENTION In order to achieve this technical object, the present invention provides a sprocket for timing chain or a sprocket for a timing chain in order from a side of a cylinder block to a shaft end protruding from a side of a cylinder block of a crankshaft. In the internal combustion engine, a timing belt pulley and a power transmission pulley for an engine accessory are fitted, and a cover case covering the timing chain or the timing belt is joined to a side surface of the cylinder block. the lubricating oil pump, disposed in the region of the side of the power transmission pulley, Au in the lubricating oil pump
Pump case with built-in rotor and inner rotor,
The pump case covers the inner surface of the cover case.
It is provided integrally so that it opens only inside the case, and this port
The lid closing the Npukesu, taken on the inner surface of the cover case
On the other hand, among the shaft ends of the crankshaft,
Side of cylinder block and sprocket for timing chain
Between the slot and the pulley for the timing belt.
The driving sprocket is fitted to the lubricating oil pump, and
Inside the cover case on the side surface of the cylinder block
Power transmission from the driving sprocket to the
The driven sprocket reached is rotatably supported, and this
The driven sprocket has an inner
Move the rotor to the cylinder block of the cover case.
To be detachably connected at the same time
In addition, the lid is provided with a suction passage and a lubricating oil pump.
And the discharge passage toward the side of the cylinder block.
It is provided integrally so as to protrude, this suction passage and
Make sure that the discharge passage is
Each of these lubricating oil passages and the lubricating oil passages to various operating parts
And joining the cover case to the cylinder block.
At the same time, it was configured to communicate . It is.

[0007]

The present invention functions and effects of the invention] is. Connect the lubricating oil pump to the cylinder
Side of lock and timing chain sprocket or tap
When installed between the pulley and the
As described above, the power transmission pool to the engine accessory
In addition to the lubricating oil port
Built-in outer rotor and inner rotor
Place the pump case on the inner surface of the cover case.
Integrated so that the open case only opens inside the cover case
And a cover for the pump case is attached to the cover.
By adopting a configuration that attaches to the inner surface of the case,
The lubricating oil pump is fitted to a shaft end of a crankshaft.
Timing chain sprocket or timing base
Crank and pulley for power transmission
The axes can overlap in the axial direction.

In addition, the shaft end of the crankshaft
Of which the side of the cylinder block and the timing chain
Part between sprocket or pulley for timing belt
Minute, a driving sprocket is fitted to the lubricating oil pump.
Power transmission from the crankshaft to the lubricating oil pump
Are performed by chain in the cover case.
While the sprocket for timing chain to the camshaft or
Is a pulley for a timing belt, as in the prior art.
Sprocket or timing belt for timing chain
Lubricating oil pump between the pulley for
Side of the cylinder block rather than
It can be close to the surface.

As a result, the timing chain or tie
The thickness of the cover case that covers the
Because it can be made much thinner than in the case of surgery,
While it is possible to reduce the weight of the engine,
Thickness of the pulley and part of the power transmission pulley
And a part of the lubricating oil pump in the axial direction of the crankshaft.
The ability to overlap
From the side of the cylinder block to the outer end face of the power transmission pulley
Can reduce the maximum protruding dimension at
The total length of the engine can be reduced.

[0010] Moreover, the lubricating oil pump is used in the prior art.
The shaft end of the crankshaft does not
The diameter of the crankshaft independently of the diameter of the shaft end
The lubricating oil pump can be reduced in diameter because it can be made smaller.
Required to drive the lubricating oil pump
Reduced power loss and improved fuel consumption in internal combustion engines
it can. . The cover case on the side of the cylinder block
From the driving sprocket on the crankshaft
The driven sprocket, which is powered by a chain, can rotate freely.
And the lubricating oil pump is
The inner rotor of the cover case
It will be detachably connected at the same time as joining to the double lock
On the other hand, in the lubricating oil pump,
The suction passage and the discharge passage are connected to the cylinder block.
It is provided integrally so as to protrude toward the side
Install the intake passage and discharge passage on the cylinder block side.
Lubricating oil passages and various working parts from the oil pan
The cylinder block of the cover case is provided in each of the oil passages.
That it is configured to communicate simultaneously with conjugation to
And the lubricating oil pump was attached to the cover case.
With the cover case in place.
Installation and removal of the lubricating oil pump
Maintenance and maintenance of the lubrication oil pump.
Can be greatly improved. . Suction passage and discharge passage in the lubricating oil pump
The lubricating oil pump to the inside of the cover case.
Cover attached to close the opening of the pump case,
So that it protrudes toward the side of the cylinder block
The suction passage and the discharge passage are provided integrally with each other.
Lubricating oil passage from oil pan on the cylinder block side
And cover lubricating oil passages to various operating parts.
To the cylinder block at the same time as
With this configuration, the lubricating oil pump
Where the suction passage and discharge passage are provided on the cover case side
The structure of the cover case is simpler than
Bar cases can be easily manufactured at low cost, and
The weight of the bar case can be reduced. . On the inner surface of the cover case,
Pump with built-in outer and inner rotors
Pump case is open only in the cover case.
And the pump case
By adopting a configuration that attaches the lid to the
Lubricating oil may leak from the oil pump.
When the mounting part of the lid is exposed inside the cover case,
Because it is possible, the mounting part of the lid in this lubricating oil pump
Lubricating oil that leaks from the cover case may leak out of the cover case.
Can be reliably reduced. . The cylinder of the shaft end of the crankshaft
Side of block and sprocket for timing chain or
Main drive fitted to the part between the timing belt pulley
Driven sprocket from lubricating oil pump to sprocket
That the power transmission to the
Therefore, power transmission during this period is lower than when power is transmitted by gears.
Cost and weight can be reduced . Has the action and effect of saying
You.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 10 denotes a cylinder block, and reference numeral 11 denotes a crankshaft which is supported by a bearing 12 in the cylinder block 10. A side surface 10 a of the cylinder block 10 has a timing to a camshaft (not shown). A cover case 14 that covers the entire chain 13 is detachably joined by a plurality of bolts 15.

Shaft end 11a of the crankshaft 11
And a pulley 16 for transmitting power to an engine accessory such as a cooling water pump (not shown) is fitted to the protruding end of the cover case 14. The sprocket 17 around which the timing chain 13 is wound
Is fitted.

Reference numeral 18 denotes a lubricating oil pump which is disposed at a side of the power transmission pulley 16 with respect to the engine accessory so that the pump shaft 18a is parallel to the crankshaft 11. The pump 18 is opened in the cover case 14 so as to open only in the cover case 14.
Inner rotor 18d which is fixed the pump casing 18b which is shaped integrally, and an outer rotor 18c which is inserted into the pump casing 18b, at the pin 18e or the like to the fitted to and pump shaft 18a to the pump shaft 18a to the A cover 18f is detachably fastened to the inner surface of the cover case 14 by bolts or the like (not shown), and the pump shaft 18a is configured to protrude into the cover case 14.

Then, a side surface 10a of the cylinder block 10 in the shaft end 11a of the crankshaft 11
A driving sprocket 19 is fitted to a portion between the sprocket 17 and the sprocket 17, and a support shaft 20 is attached to a portion of the side surface 10 a of the cylinder block 10 facing the pump shaft 18 a of the lubricating oil pump 18. ,
The support shaft 20 is provided in parallel with the pump shaft 18a.
, A driven sprocket 21 is rotatably fitted thereon, and an endless chain 22 is wound between the driven sprocket 21 and the driving sprocket 19 to transmit the rotation of the crankshaft 11 to the driven sprocket 21. Further, a plurality of clutch claws 23 are integrally protruded from a side surface of the driven sprocket 21 on the pump shaft 18a side.

On the other hand, a clutch body 24 having a plurality of clutch claws 24a on its outer periphery is fixed to a pump shaft 18a of the lubricating oil pump 18, and the clutch claws 24a of the clutch body 24 are The rotation of the driven sprocket 21 is transmitted to a pump shaft 18 a of the lubricating oil pump 18 by being detachably engaged with and connected to the clutch claw 23.

Further, the suction of the lubricating oil pump 18
The chamber 18g is provided with the cylinder block on the lid 18f.
To protrude toward the side surface 10a of the
It is connected to a suction passage 26 provided inside the shaped member 25.
And the discharge chamber 18 of the lubricating oil pump 18
h is the side of the cylinder block 10 on the lid 18f.
A part integrally formed so as to protrude toward the surface 10a
It communicates with a discharge passage 31 provided inside the material 30,
The weir passage 26 and the discharge passage 31 are provided in the cover case.
14 is attached to the side of the cylinder block 10
At the same time, the oil pan 2 on the cylinder block 10 side
9 through an oil filter (not shown) through a pipe 28.
Oil passage 27 and main oil gallery communicating with each other
(Not shown) each of the lubricating oil passages 32 to various operating parts
It is configured to be connected to.

In this configuration, the pump shaft 18a of the lubricating oil pump 18 rotates by transmission of power from the crankshaft 11, so that the lubricating oil in the oil pan 29 passes through the pipe 28 and the passages 27, 26. After being sucked into the lubricating oil pump 18 through the suction chamber 18g , various works such as the main oil gallery in the cylinder block 10 from the discharge chamber 18h through the passages 31 and 32 are performed.
It is pumped to the moving part .

Then, instead of disposing the lubricating oil pump 18 between the side face 10a of the cylinder block 10 and the sprocket 17 for the timing chain as in the prior art, as described above, The pump shaft 18a of the lubricating oil pump 18 is disposed at the side of the pulley 16 for transmitting power to the lubricating oil pump 18 so as to protrude into the cover case 14. The timing chain sprocket 17 and the power transmission pulley 16 fitted to the end 11a can overlap in the axial direction of the crankshaft 11.

Further, a lubricating oil pump 18 is disposed at a side of the pulley 16 for transmitting power to an engine accessory so that the pump shaft 18 of the lubricating oil pump 18 projects into the cover case 14. On the other hand, a driving sprocket 19 is fitted to a portion of the shaft end 11a of the crankshaft 11 inside the cover case, and power is transmitted from the driving sprocket 19 to the pump shaft 18a by an endless chain 22. As a result, while transmitting power from the crankshaft 11 to the lubricating oil pump 18 in the cover case 14, the timing chain sprocket 17 to the camshaft is changed to the timing chain sprocket 17 as in the prior art. And the side face 10a of the cylinder block 10, the lubricating oil pump 18 is more Side 10a of da block 10
Therefore, the thickness of the cover case 14 covering the timing chain 13 can be made much thinner than in the case of the prior art.

As described above, the thickness of the cover case 14 can be reduced, and the above-described overlap, together with the maximum protrusion dimension L from the side surface 10a of the cylinder block 10 to the outer side surface of the power transmission pulley 16, can be obtained. Can be shortened. Further, as described above, the driven sprocket 21 interlocking with the driving sprocket 19 at the shaft end 11a of the crankshaft 11 is supported on the cylinder block 10 side via the support shaft 20, and the side surface of the driven sprocket 21 is A plurality of clutch claws 23 are provided on the pump shaft 18a of the lubricating oil pump 18 while the plurality of clutch claws 23 are provided.
By fixing the clutch body 24 provided with the clutch body 4a and detachably engaging and connecting the clutch body 24 to the clutch part 23 of the driven sprocket 21, as shown in FIG. Lubricating oil pump 18
Is assembled to the cover case 14,
Since the endless chain 22 is wound between the driving sprocket 17 and the driven sprocket 21, and the cover case 14 is joined to the cylinder block 10 in this state, the entire assembly and disassembly can be performed. Thus, the workability of assembly and disassembly in the lubricating oil pump 18, that is, the maintainability can be greatly improved. In this case, the detachable connection between the pump shaft 18a and the driven sprocket 21 can be achieved by another configuration instead of the above-described clutch type.

The above-described improvement of the assembling workability, that is, the improvement of the maintainability of the lubricating oil pump 18 can also be achieved by configuring as shown in FIGS. That is, in this embodiment, the driven sprocket 21 is fitted on the support shaft 20a, and the support shaft 20a is rotatably supported on the cylinder block 10. The pump shaft 18a 'formed in a square shape is integrally connected, and the pump shaft 18a' is configured to be removably inserted into the inner rotor 18d of the lubricating oil pump 18 (this pump shaft 18a '). In this case, the pump shaft 18a 'integrated with the support shaft 20a may be configured as a spline shaft instead of having a square cross-section, and other configurations are shown in FIGS. Same as the one.

With this configuration, as shown in FIG. 8, the entire lubricating oil pump 18 is
4, the endless chain 22 is wound between the driving sprocket 17 and the driven sprocket 21, and in this state, the cover case 14 is joined to the cylinder block 10 side to assemble the entire assembly. Since disassembly can be performed, workability of assembly and disassembly in the lubricating oil pump 18, that is, maintainability can be greatly improved.

In each of the embodiments described above, the crankshaft 1
Although the case where power transmission from 1 to the camshaft is performed by the timing chain 13 has been described, the present invention is not limited to this, and is similarly applied to the case where power transmission from the crankshaft 11 to the camshaft is performed by a timing belt. It goes without saying that you can do it.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a cross-sectional view showing a disassembled state in FIG.

FIG. 6 is a sectional view showing a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a cross-sectional view showing a disassembled state in FIG.

FIG. 9 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 Cylinder block 11 Crankshaft 11a Shaft end of crankshaft 12 Bearing 13 Timing chain 14 Cover case 16 Power transmission pulley 17 Sprocket 18 Lubricating oil pump 18a, 18a 'Pump shaft 19 Main sprocket 20, 20a Support shaft 21 Follower sprocket 22 Endless chain 23 Clutch claw 24 Clutch body

Claims (1)

(57) [Claims] 1. A sprocket or timing belt pulley for a timing chain and a pulley for a power transmission to an engine auxiliary machine are fitted to a shaft end of a crankshaft protruding from a side surface of a cylinder block in order from a side surface of the cylinder block. On the other hand, in an internal combustion engine in which a cover case that covers the timing chain or the timing belt is joined to a side surface of the cylinder block, a lubricating oil pump in the internal combustion engine is arranged on a side portion of the power transmission pulley. Installed in this lubricating oil pump.
Pump casing with built-in outer rotor and inner rotor
Pump case on the inner surface of the cover case.
It is provided integrally so as to open only in the cover case,
Place the lid closing this pump case inside the cover case.
Surface while the shaft end of the crankshaft
The side of the cylinder block and the timing chain
Part between proket and pulley for timing belt
, A driving sprocket is fitted to the lubricating oil pump,
And the cover cover on the side surface of the cylinder block.
In the part inside the base, use the chain from the driving sprocket
The driven sprocket to be powered is rotatably supported
To the driven sprocket and the lubricating oil pump
The inner rotor to the cylinder block of the cover case.
It is configured to be detachably connected at the same time as joining to the
In addition, a suction by a lubricating oil pump is
The passage and the discharge passage toward the side of the cylinder block.
It is provided integrally so as to protrude,
Oil on the cylinder block side
Lubricating oil passage from pan and lubricating oil passage to various working parts
In each case, the cover case corresponds to the cylinder block.
A mounting device for a lubricating pump in an internal combustion engine, wherein the mounting device is configured to be connected simultaneously with joining .