JPH07127412A - Oil pump for internal combustion engine - Google Patents

Abstract

PURPOSE:To omit the number of part items, assembling manhours and machining manhours for an oil pump and make the oil pump lightweight while shortening the whole length of an engine. CONSTITUTION:A first fitting face part 20-1 for an oil pump is provided almost on the same face as the end face part of a crank holding part 6, and a second fitting face part 20-2 for the oil pump is provided almost on the same face as the end face part of a bearing cap 8 so as to form an oil pump fitting face part for fitting the oil pump 22 directly by the first and second fitting face parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump for an internal combustion engine, and more particularly to an internal combustion engine driven by rotation of a crank shaft rotatably mounted by a crank holding portion and a bearing cap formed in the lower portion of a cylinder block. Regarding the oil pump of the engine.

[0002]

2. Description of the Related Art In an internal combustion engine mounted on a vehicle, an oil pump circulates oil for lubrication and cooling of various parts of the engine. The oil is stored in an oil pan below the internal combustion engine, is supplied to each part of the engine, performs lubrication and cooling of each part of the internal combustion engine, and then is returned to the oil pan.

Further, as a lubricating oil pump for an internal combustion engine,
As disclosed in Japanese Utility Model Laid-Open No. 58-127110, in a lubricating oil pump mounted on an internal combustion engine body and driven by gears, a positioning for fitting a part of the outer periphery of the lubricating oil pump to the internal combustion engine body side. There was one with a spigot part for.

[0004]

By the way, in the conventional internal combustion engine, as shown in FIG. 3, a cylinder head (not shown) and a cylinder head cover (not shown) are fixedly installed above the cylinder block 104. .

A bearing cap 108 is attached to the crank holding portion 106 formed at the bottom of the cylinder block 104. An oil pan (not shown) is attached to the lower edge portion of the bearing cap 108.

A crank shaft 110 is pivotally supported between the crank holding portion 106 and the upper surface portion of the bearing cap 108. The crankshaft 110 is used for the internal combustion engine 10
2 from one end surface side (left side in FIG. 3) to the other end surface side (FIG. 3
In the right side).

Further, one end of the crankshaft 110 (see FIG.
On the left side), the auxiliary drive crank pulley 112
Is attached, and the crank timing sprocket 1 is located inside the auxiliary drive crank pulley 112.
14 is attached. A timing chain 116 is wound around the crank timing sprocket 114.

The crank timing sprocket 11
4 and the timing chain 116 are surrounded by a timing chain cover 118.

The oil pump 122 of the internal combustion engine 102 is attached to the cylinder block 104 and the bearing cap 108 via an oil pump plate 132.

The oil pump 122 includes an outer rotor 126 and an inner rotor 1 in an oil pump case 124.
And 28. Positioning of the outer rotor 126 and the inner rotor 128 in the thrust direction is performed by the oil pump plate 132.

The oil pump plate 132 was fastened and fixed to the oil pump case 124 with screws 134.

Further, in such an internal combustion engine 102, it is necessary to machine and form the oil supply hole 136 in the crank holding portion 106 of the cylinder block 104 in order to lubricate the axially supporting portion of the crankshaft 110.

As a result, the number of parts of the oil pump 122, the number of assembling steps, and the number of processing steps are large, which leads to an increase in manufacturing cost and is economically disadvantageous.

Further, the total length of the internal combustion engine 102 is increased by the thickness of the oil pump plate 132, which causes the internal combustion engine 102 to be upsized, which is disadvantageous in practical use.

[0015]

Therefore, according to the present invention, in order to eliminate the above-mentioned inconvenience, the rotation of a crankshaft rotatably attached by a crank holding portion and a bearing cap formed in a lower portion of a cylinder block. In the oil pump driven by the oil pump, the first mounting surface portion for the oil pump is provided on substantially the same surface as the end surface portion of the crank holding portion, and the second mounting surface portion for the oil pump is provided on substantially the same surface as the end surface portion of the bearing cap. Is provided, and the oil pump mounting surface portion directly mounting the oil pump is constituted by the first mounting surface portion and the second mounting surface portion.

[0016]

According to the invention as described above, the first mounting surface portion for the oil pump, which is provided substantially on the same surface as the end surface portion of the crank holding portion, and the oil pump, which is provided substantially on the same surface as the end surface portion of the bearing cap. The second pump mounting surface portion constitutes an oil pump mounting surface portion, and the oil pump is directly mounted on the oil pump mounting surface portion.

[0017]

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of the present invention. In FIG. 1, 2 is an internal combustion engine, and 4 is a cylinder block. The internal combustion engine 2 includes a cylinder block 4
A cylinder head (not shown) and a cylinder head cover (not shown) are fixedly installed on the upper side.

A bearing cap 8 is attached to the crank holding portion 6 formed in the lower portion of the cylinder block 4.
Is attached. An oil pan (not shown) is attached to the lower edge portion of the bearing cap 8.

A crankshaft 10 is pivotally supported between the crank holding portion 6 and the upper surface portion of the bearing cap 8. The crankshaft 10 is arranged from one end surface side (left side in FIG. 1) of the internal combustion engine 2 toward the other end surface side (right side in FIG. 1).

Further, an auxiliary equipment driving crank pulley 12 is attached to one end (left side in FIG. 1) of the crankshaft 10, and a crank timing sprocket 14 is attached inside the auxiliary equipment driving crank pulley 12. Has been. This crank timing sprocket 1
A timing chain 16 is wound around 4.

The crank timing sprocket 14
The timing chain 16 and the timing chain 16 are surrounded by a timing chain cover 18.

Furthermore, the first mounting surface portion 20-1 for the oil pump is provided on the same plane as the end surface portion of the crank holding portion 6.
And the second mounting surface portion 20-2 for the oil pump is provided on substantially the same plane as the end surface portion of the bearing cap 8.
Is provided, and the first mounting surface portion 20-1 and the second mounting surface portion 20 are provided.
-2 is used to provide the oil pump mounting surface portion 20 for directly mounting the oil pump 22.

More specifically, the oil pump 22 includes an oil pump case 24 and the oil pump case 24.
The outer rotor 26 is housed inside, and the inner rotor 28 is housed inside the outer rotor 26.

The first mounting surface portion 20-1 is shown in FIG.
As shown in, the crank holding portion 6 and the bearing cap 8
Is provided directly above the mating surface A with, for example, substantially concentric with the crankshaft 10, and the second mounting surface portion 2 is provided.
0-2 is provided directly below the mating surface A, for example, substantially concentrically with the crankshaft 10.

The first mounting surface portion 20-1 and the second mounting surface portion 20-2 form an oil pump mounting surface portion 20 that straddles the mating surface A between the crank holding portion 6 and the bearing cap 8. That is, the crank holder 6
Crankshaft 1 on the mating surface A between the bearing cap 8 and the bearing cap 8
The oil pump mounting surface portion 20 is formed at the zero edge portion.

An oil pump 22 is attached to the oil pump attachment surface portion 20 with bolts (not shown). The oil pump mounting surface portion 20 serves as an oil pump 2
2 is attached.

Further, in the inside portion of the oil pump mounting surface portion 20, the outer rotor 26 and the inner rotor 28 housed in the oil pump case 24 are positioned in the thrust direction by a conventional oil pump plate (see FIG. 3).
It is done instead of.

Next, the operation will be described.

A first mounting surface portion 20-1 for an oil pump, which is provided on substantially the same surface as the end surface portion of the crank holding portion 6, and a second oil pump second, which is provided on substantially the same surface as the end surface portion of the bearing cap 8. The oil pump mounting surface portion 20 is provided by the mounting surface portion 20-2, and the oil pump 22 is directly mounted on the oil pump mounting surface portion 20.

When the crankshaft 12 rotates,
The oil pump 22 is driven, and the oil pump 22
The crankshaft 12 by the hydraulic pressure of the rotor chamber (not shown) inside
Oil is supplied and lubricated to the shaft support part.

As a result, the oil pump plate (see FIG. 3) used for positioning the outer rotor 26 and the inner rotor 28 in the thrust direction in the conventional oil pump can be omitted, and the oil pump plate (see FIG. 3) can be omitted. It is possible to omit the screw for attaching the oil pump, which can reduce the manufacturing cost of the oil pump, which is economically advantageous, and the man-hours for assembling can be omitted, which is practically advantageous.

The oil pump plate (see FIG. 3)
By omitting the mounting screw, the screw processing of the oil pump case 24 for the screw can be omitted, and the manufacturing process can be shortened, which is economically advantageous.

Further, an oil pump plate (see FIG. 3)
By omitting, the oil pump can be lightened and the engine can be downsized by shortening the overall length of the engine, which is practically advantageous.

[0035]

As described in detail above, according to the present invention, the oil pump driven by the rotation of the crank shaft rotatably mounted by the crank holding portion and the bearing cap formed in the lower portion of the cylinder block. The first mounting surface portion for the oil pump is provided on substantially the same surface as the end surface portion of the crank holding portion, and the second mounting surface portion for the oil pump is provided on substantially the same surface as the end surface portion of the bearing cap. Since the oil pump mounting surface portion for directly mounting the oil pump is constituted by the second mounting surface portion, the parts used in the conventional oil pump can be omitted, the manufacturing cost of the oil pump can be reduced, and it is economically advantageous. In addition, the number of assembling steps can be omitted, which is practically advantageous. Further, by omitting the parts used in the conventional oil pump, it is possible to reduce the processing man-hour of the oil pump case, the manufacturing process can be shortened, it is economically advantageous, and the weight of the oil pump can be reduced. The overall length of the engine can be reduced and the engine can be downsized, which is practically advantageous.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil pump of an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a schematic front view of an oil pump of an internal combustion engine.

FIG. 3 is a sectional view of an oil pump of an internal combustion engine showing a conventional technique of the present invention.

[Explanation of symbols]

 2 Internal Combustion Engine 4 Cylinder Block 6 Crank Holding Part 8 Bearing Cap 10 Crank Shaft 12 Auxiliary Machine Driving Crank Pulley 14 Crank Timing Sprocket 16 Timing Chain 20-1 Oil Pump First Mounting Surface 20-2 Oil Pump Second Mounting Surface 22 oil pump 24 oil pump case 26 outer rotor 28 inner rotor

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[Procedure amendment]

[Submission date] January 31, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (1)

[Claims] 1. An oil pump driven by rotation of a crank shaft rotatably mounted by a crank holding portion formed at a lower portion of a cylinder block and a bearing cap, and being substantially the same as an end face portion of the crank holding portion. A first mounting surface portion for the oil pump is provided on the surface, and a second mounting surface portion for the oil pump is provided on substantially the same surface as the end surface portion of the bearing cap, and the oil pump is formed by the first mounting surface portion and the second mounting surface portion. An oil pump for an internal combustion engine, comprising an oil pump mounting surface portion for directly mounting the oil pump.