JPH0598993A - Lubricating pump mounting device in internal combustion engine - Google Patents

Abstract

PURPOSE:To shorten the axial dimension of a crankshaft of an engine while facilitating the removable attachment of a lubricating pump by disposing the lubricating pump in position sideways of a pulley for transmitting power to auxiliaries of the engine to be attached to a cover case. CONSTITUTION:A cover case 14 for covering the whole timing chain leading to a cam shaft is removably attached to the side 10a of a cylinder block 10 by bolts 15..., and a projecting end 11a of a crankshaft projecting from the cover case 14 to the outside is fitted in a pulley 16 for transmitting power to auxiliaries of an engine. A lubricating pump 18 is disposed on a position sideway of the pulley 16 so that a pump shaft 18a is parallel to a crankshaft 11. The pump 18 is mounted on the cover case 14. A driven sprocket 21 for receiving power from a shaft end 11a of the crankshaft 11 is provided on the side 10a of the cylinder block, and the pump shaft 18a is mounted on the sprocket 21 by mounting the cover case 14 at the same time.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art In recent internal combustion engines, for example, Japanese Utility Model Laid-Open No. Sho 62-167961 and Japanese Utility Model Laid-Open No. 1-1083.
No. 07 publication, and as shown in FIG. 8, the lubricating oil pump 1 for the internal combustion engine is fitted to the side surface 2a of the cylinder block 2 at the shaft end portion 3a of the crankshaft 3. It is configured to be attached.

By the way, the shaft end portion 3a of the crankshaft 3 is described.
A sprocket 5 for a timing chain (or timing belt) 4 for power transmission to a camshaft (not shown), and a pulley 6 for power transmission to an engine auxiliary machine such as a cooling water pump and an alternator are fitted to the shaft. Meanwhile, a cover case 7 that covers the timing chain 4 is coupled to the side surface 2a of the cylinder block 2.

[0004]

Therefore, the sprocket 5 for the timing chain 4 and the 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 fitted. 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 attached to the side surface 2a of the cylinder block 2 so as to be fitted on the shaft end portion 3a of the crankshaft 3 as described above. With the configuration ,. Between the side surface 2a of the cylinder block 2 and the timing chain sprocket 5, it is necessary to secure a space for disposing the lubricating oil pump 1. In other words, the timing chain sprocket 5 is installed. Since it is necessary to move away from the side surface 2a of the cylinder block 2 by the thickness dimension of the lubricating oil pump 1, the thickness dimension of the cover case 7 becomes thick and the weight of the internal combustion engine increases. In addition, the maximum protruding dimension L from the side surface 2a of the cylinder block 2 to the outer end surface of the pulley 6 is increased, and the overall length in the crankshaft direction of the internal combustion engine is increased. ． As mentioned above, the timing chain sprocket 5
The distance from the side surface 2a of the cylinder block 2 increases the bending moment acting on the shaft end portion 3a of the crankshaft 3 due to the power transmission from the crankshaft to the camshaft, and therefore the diameter of the shaft end portion 3a. Has to be increased, which increases 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 simply removed by removing the cover case 7. Cannot be disassembled, which makes maintenance of the lubricating oil pump difficult. The problem was called.

The present invention has a technical problem to solve these problems all at once.

[0006]

In order to achieve this technical object, the present invention provides a timing chain sprocket or timing for a shaft end of a crankshaft projecting from a side surface of a cylinder block in order from the side surface of the cylinder block. In an internal combustion engine in which a belt pulley and a power transmission pulley for an engine accessory are fitted to each other, and a cover case covering the timing chain or the timing belt is joined to a side surface of the cylinder block, lubrication in the internal combustion engine An oil pump is arranged on a side portion of the power transmission pulley, the lubricating oil pump is mounted on the cover case, and the lubrication is provided on a portion of the shaft end portion of the crankshaft inside the cover case. While the driving power transmission wheel to the oil pump is fitted, on the side surface of the cylinder block, the cover case is attached. A driven power transmission wheel for transmitting power from the main power transmission wheel is provided in a portion inside the space, and the lubricating oil pump can be detachably attached to the driven power transmission wheel at the same time when the cover case is joined to the cylinder block. Configured to connect.

[0007]

According to the present invention, instead of disposing the lubricating oil pump between the side surface of the cylinder block and the timing chain sprocket or the timing belt pulley as in the prior art, as described above, The timing chain sprocket or the timing chain sprocket fitted to the shaft end of the crankshaft or the timing was arranged by arranging it at the side part of the power transmission pulley to the accessory and mounting it on the cover case. It is possible to overlap the belt pulley and the power transmission pulley in the axial direction of the crankshaft.

Further, the lubricating oil pump is arranged at a side portion of the pulley for transmitting power to the engine auxiliary equipment, and the lubricating oil pump is provided at a portion of the shaft end portion of the crankshaft inside the cover case. By fitting the driving power transmission wheel to the crankshaft, the power transmission from the crankshaft to the lubricating oil pump is performed in the cover case, while the timing chain sprocket or timing belt pulley to the camshaft is Since the lubricating oil pump can be brought closer to the side surface of the cylinder block than when the lubricating oil pump is arranged between the timing chain sprocket or the timing belt pulley and the side surface of the cylinder block as in the prior art, The thickness of the cover case covering the chain or the timing belt is set to be larger than that of the above-mentioned prior art. It is possible to reduce the width.

In addition, a driven power transmission wheel for transmitting power from the main power transmission wheel is provided in a portion of the side surface of the cylinder block inside the cover case, and the lubricating oil pump is attached to the driven power transmission wheel. By connecting the cover case to the cylinder block so that the lubricating oil pump can be detachably connected at the same time, the lubricating oil pump can be installed and removed together with the cover case in a state where the lubricating oil pump is installed in the cover case. This makes it easy to install and remove the lubricating oil pump.

[0010]

Therefore, according to the present invention: By reducing the thickness of the cover case, it is possible to reduce the weight of the internal combustion engine. ． By making it possible to reduce the thickness of the cover case and allowing a part of the power transmission pulley and a part of the lubricating oil pump to overlap in the axial direction of the crankshaft, Since the maximum protruding dimension of the power transmission pulley to the outer end surface can be reduced, the total length of the internal combustion engine can be shortened. ． By disposing the lubricating oil pump at the side portion of the power transmission pulley to the engine accessory without fitting the shaft end portion of the crankshaft as in the above-mentioned prior art, the diameter of the crankshaft can be reduced. Since the diameter can be reduced regardless of the diameter of the shaft end portion of the shaft, the diameter of the lubricating oil pump can be reduced and the power loss required to drive the lubricating oil pump is reduced, improving the fuel consumption rate in the internal combustion engine. it can. ． Since the attachment / detachment of the lubricating oil pump can be performed at the same time by attaching / detaching the cover case to / from the cylinder block, maintenance of the lubricating oil pump can be significantly improved. It has the effect of.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 10 indicates a cylinder block, and reference numeral 11 indicates a crankshaft pivotally supported by a bearing portion 12 of the cylinder block 10, and a side surface 10a 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.

A shaft end portion 11a of the crankshaft 11
While protruding to the outside of the cover case 14 and fitting a pulley 16 for power transmission to an engine accessory such as a cooling water pump (not shown) to the protruding end, while covering the cover case of the shaft end portion 11a. A sprocket 17 around which the timing chain 13 is wound is attached to a portion inside 14.
Fit in.

Reference numeral 18 denotes a lubricating oil pump which is arranged at a side portion of the power transmission pulley 16 for the engine accessory so that the pump shaft 18a is parallel to the crank shaft 11. The pump 18 includes a pump case 18b formed integrally with the cover case 14 and an outer rotor 18c inserted into the pump case 18b.
And an inner rotor 18d fitted to the pump shaft 18a and fixed to the pump shaft 18a with a pin 18e or the like.
And a lid 18f detachably fastened to the inner surface of the cover case 14 by a bolt or the like (not shown), and the pump shaft 18a thereof is configured to project into the cover case 14.

A driving sprocket 19, which is one embodiment of a driving power transmission wheel, is fitted to a portion of the shaft end 11a of the crankshaft 11 inside the cover case 14, while A support shaft 20 is provided parallel to the pump shaft 18a at a portion of the side surface 10a of the cylinder block 10 facing the pump shaft 18a of the lubricating oil pump 18, and the driven power is transmitted to the support shaft 20. A driven sprocket 21, which is one embodiment of a wheel, is rotatably fitted,
The driven sprocket 21 and the driving sprocket 1
Coil the endless chain 22 between the crankshaft 1 and
1 rotation is transmitted to the driven sprocket 21, and a plurality of clutch pawls 23 are integrally projected on the 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 pawls 24a on its outer periphery is fixed to a pump shaft 18a of the lubricating oil pump 18, and the clutch pawls 24a of the clutch body 24 are attached to the driven sprocket 21. The rotation of the driven sprocket 21 is transmitted to the pump shaft 18a of the lubricating oil pump 18 by being removably engaged with and coupled to the clutch claw 23.

The suction chamber 18g of the lubricating oil pump 18 has a passage 26 formed in the molded member 25 integrally with the lid 18f, a passage 27 formed in the cylinder block 10 and a pipe connected to the passage 27. An oil filter (not shown) in the bottom of an oil pan 29 attached to the lower surface of the cylinder block 10 is communicated via 28. On the other hand, the discharge chamber 18h of the lubricating oil pump 18 has a passage 31 and a cylinder block 10 formed in a molded member 30 integrally with the lid 18f.
A main oil gallery (not shown) in the cylinder block 10 communicates with the passage 32 formed in the cylinder block 10.

In this structure, the pump shaft 18a of the lubricating oil pump 18 is rotated by the power transmission from the crankshaft 11, so that the lubricating oil in the oil pan 29 passes through the pipe 28 and the passages 27 and 26. After being sucked into the lubricating oil pump 18 through the suction chamber 18g, it is pumped from the discharge chamber 18h to the main oil gallery in the cylinder block 10 through the passages 31 and 32.

Then, instead of disposing the lubricating oil pump 18 between the side surface 10a of the cylinder block 10 and the timing chain sprocket 17 as in the prior art, as described above, the engine auxiliary machine is used. By disposing the pump shaft 18a of the lubricating oil pump 18 so as to project into the cover case 14 at a side portion of the power transmission pulley 16 to the shaft of the crankshaft 11, 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, the lubricating oil pump 18 is arranged at a side portion of the pulley 16 for transmitting power to the 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 the power transmission from the crankshaft 11 to the lubricating oil pump 18 is performed in the cover case 14, the timing chain sprocket 17 for the camshaft is replaced by the timing chain sprocket 17 as in the prior art. Compared to the case where the lubricating oil pump 18 is provided between the cylinder block 10 and the side surface 10a of the cylinder block 10, Side 10a of da block 10
Therefore, the thickness of the cover case 14 that covers the timing chain 13 can be significantly reduced as compared with the prior art.

As described above, the thickness of the cover case 14 can be reduced, and the overlap described above is combined, so that the maximum protrusion dimension L from the side surface 10a of the cylinder block 10 to the outer surface of the power transmission pulley 16 is increased. Can be shortened. Moreover, as described above, on the cylinder block 10 side, the driven sprocket 21 that interlocks with the driving sprocket 19 of the shaft end portion 11a of the crankshaft 11 is pivotally supported via the support shaft 20, and the side surface of the driven sprocket 21 is supported. While the plurality of clutch pawls 23 are provided, the plurality of clutch pawls 2 are attached to the pump shaft 18a of the lubricating oil pump 18.
By fixing the clutch body 24 provided with 4a and detachably meshing / connecting the clutch body 24 with the clutch portion 23 of the driven sprocket 21, as shown in FIG. Lubricating oil pump 18
While assembling the whole of the above 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 side in this state, the entire assembly and disassembly can be performed. The workability of assembling and disassembling 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 clutch type shown in the drawing.

In the above embodiment, the lid 18f of the lubricating oil pump 18 is of a so-called inner lid type so as to be detachably fastened to the inner surface of the cover case 14 with bolts or the like. However, the present invention is not limited to this,
As shown in FIG. 6, a lid 18f ′ of the lubricating oil pump 18 may be detachably attached to the outside of the cover case 14 by a bolt or the like (not shown), so-called an outer lid type. In the case of the outer lid type, the members 25a and 30a for forming the passages 26 and 31 are integrally formed on the cover case 14 side.

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. 7 to 9. That is, in this embodiment, the driven sprocket 21 is fitted to the support shaft 20a thereof, and the support shaft 20a is rotatably supported with respect to the cylinder block 10, while the support shaft 20a has a cross section. A rectangular pump shaft 18a 'is integrally connected, and the pump shaft 18a' is detachably fitted into the inner rotor 18d of the lubricating oil pump 18 (this In this case, the pump shaft 18a 'integrated with the support shaft 20a may be configured as a spline shaft instead of being configured as a square section), and other configurations are shown in FIGS. It is similar to the one.

With this structure, as shown in FIG. 9, the entire lubricating oil pump 18 is covered with the cover case 1.
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 complete the assembly and Since the disassembling can be performed, the workability of assembling and disassembling the lubricating oil pump 18, that is, the maintainability can be greatly improved.

In the embodiment shown in FIGS. 7 to 9,
The lid 18f 'of the lubricating oil pump 1 can be of an outer lid type as shown in FIG.
The pump shaft 18a 'integrated with the
As shown in FIG. 5, the pin 33 may be planted, and the pin 33 may be detachably fitted into the inner rotor 18d of the lubricating oil pump 18.

In each of the above-described embodiments, the crankshaft 1
1. A driving sprocket 19 is fitted to the shaft end 11a of the first engine 1 and the lubricating oil pump 18
However, the present invention is not limited to this, and a gear is used as a driving power transmission wheel instead of the driving sprocket 19, and the lubricating oil pump 18 is connected to the gear. It may be configured to transmit power. Moreover, although the case where the power transmission from the crankshaft 11 to the camshaft is performed by the timing chain 13 has been described, the present invention is not limited to this, and the crankshaft 1 is not limited thereto.
It goes without saying that the same can be applied to the case where the power transmission from 1 to the cam shaft is performed by the timing belt.

[Brief description of 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.

4 is a sectional view taken along line IV-IV in FIG.

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

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

FIG. 7 is a sectional view showing a third embodiment of the present invention.

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

FIG. 9 is a cross-sectional view showing a state of being disassembled in FIG.

FIG. 10 is a sectional view showing a fourth embodiment of the present invention.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 10 Cylinder Block 11 Crank Shaft 11a Crank Shaft End 12 Bearing 13 Timing Chain 14 Cover Case 16 Power Transmission Pulley 17 Sprocket 18 Lubricating Oil Pump 18a, 18a 'Pump Shaft 19 Driving Sprocket 20, 20a Support Shaft 21 Driven Sprocket 22 Endless chain 23 Clutch claw 24 Clutch body

Claims (1)

[Claims] 1. A sprocket for a timing chain or a pulley for a timing belt and a power transmission pulley for an engine accessory are sequentially fitted to a shaft end portion of a crankshaft protruding from a side surface of a 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 at a side portion of the power transmission pulley. The lubricating oil pump is mounted on the cover case, and a driving power transmission wheel for the lubricating oil pump is fitted on a portion of the shaft end of the crankshaft inside the cover case. A part of the side surface of the cylinder block inside the cover case is used to transmit power from the main power transmission wheel. A lubricating pump for an internal combustion engine, characterized in that a power transmission wheel is provided, and the driven oil power transmission wheel is configured to detachably connect the lubricating oil pump at the same time when the cover case is joined to the cylinder block. Mounting device.