JPS61106909A - Oil pump device in engine - Google Patents

Abstract

PURPOSE:To aim at shortening the overall length of an engine, by attaching an oil pump to the outer wall of a cylinder block, and by connecting a relief passage in a regulator valve to the oil suction port of a cylinder block and the suction port of the oil pump. CONSTITUTION:The oil suction port 36a of an oil suction passage 36 communicated with an oil pan and the oil feed port 37a of a feed passage 37 communicated with sections to be lubricated are opened to the outer wall 2b of a cylinder block 2. An oil pump 30 is attached to the outer wall of the cylinder block 2. The oil suction port 36a and the oil feed port 37a are communicated with the suction port 30a and discharge port 30b of the oil pump 30, respectively. A relief passage 40 in a regulator valve in the oil pump 30 is connected between the oil suction port 36a of the cylinder block 2 and the suction port 30a of the oil pump 30. Thus it is possible to aim at shortening the overall length of an engine.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an oil pump device for an engine.

(Prior Art) In general, as an oil pump device for supplying lubricating oil to an engine, an oil pump is disposed near the front end of the crankshaft, as seen in Japanese Utility Model Publication No. 56-24245, and the oil pump is installed near the front end of the crankshaft. It is driven by attaching an external gear directly to the shaft. However, with this structure, the crankshaft is as long as the width of the oil pump, which poses an obstacle to shortening the overall length of the engine.

Additionally, an oil pump installed in the oil pan and driven by a crankshaft via a chain or the like has been adopted, but with this type there is less freedom in the shape of the oil pan. There are some problems.

On the other hand, an engine oil pump employs a mechanism in which the pressure of oil supplied to each lubricating part is maintained constant using a regulator valve. The oil relieved by this regulator valve must be returned to the low-pressure side of the oil pan, etc., and a relief passage for this must be formed separately from the oil absorption passage and the supply passage, and the passage configuration and seal structure must be This complicates the process and is disadvantageous against oil leakage.

(Object of the Invention) In view of the above circumstances, the present invention provides a method for mounting an oil pump on the outer wall of the cylinder block of the engine in order to shorten the overall length of the engine and increase the degree of freedom in the shape of the oil pan.
It is an object of the present invention to provide an oil pump device for an engine in which a relief passage of a regulator valve is configured simply.

(Structure of the Invention) n The oil pump device of the present invention has an oil suction port of an oil suction passage connected to an oil pan and an oil feed port of an oil feed passage connected to each lubricating part opened on the outer wall of the cylinder heads i and jl. At the same time, install the oil pump on the outer wall of the cylinder block,
Connect the oil suction port and oil supply port to the oil pump suction port and discharge port, respectively, and further connect the relief passage of the regulator valve of this oil pump between the oil suction port of the cylinder block and the oil pump suction port. It is characterized by the fact that

(Effects of the Invention) According to the present invention, by configuring the oil pump to be attached to the outer wall of the cylinder block, it is possible to shorten the overall length of the engine and increase the degree of freedom in the shape of the oil pan. The layout can be made more compact by setting the layout.

Furthermore, by connecting the relief passage of the oil pump's regulator valve between the oil suction port of the cylinder block and the oil pump suction port, there is no need to form a relief passage to the oil pan within the cylinder block. The number of connecting passages at the connecting portion between the oil pump and the oil pump can be reduced, and the configuration and seal structure can be simplified, which is advantageous in preventing oil leakage.

(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

Fig. 1 is a schematic front view of the engine, Fig. 2 is a side view of the main parts of the engine partially shown in section, Fig. 3 is a sectional front view taken in a direction perpendicular to the crankshaft, and Fig. 4 is a partially sectional side view. FIG. 2 is a plan view of a main part of a cylinder block shown in cross section.

The engine 1 has a cylinder head 3 on the cylinder block 2.
are fastened, and an oil pan 4 is installed at the bottom of the cylinder block 2.
However, a head cover 5 is mounted on each cylinder head 3. Cylinder bore 2 of cylinder block 2
A piston 6 is fitted into the hole a, and this piston 6 is connected to a link shaft 8 by a hinge rod 7 (see FIG. 3).

One end of the crankshaft 8 protrudes to the front side of the cylinder block 2, and a crank pulley 11, which is engaged with a timing belt 10 for driving a camshaft 9 of a valve mechanism, is integrally fixed to the crankshaft 8. ing. The timing belt 10 is engaged with a cam pulley 12 and two idler pulleys 13 and 13 fixed to the camshaft 9 to drive the camshaft 9, and a part of the timing belt 10 is engaged with an intermediate pulley 15 of an intermediate shaft 14. and this intermediate shaft 14 is driven at the same time.

Further, a pair of balancer shafts 17 and 18 are arranged on the left and right sides of the cylinder block 2. These left and right balancer shafts 17 and 18 are eccentrically formed balance weights 1.
7a and 18a, and are housed in balancer cases 19 and 19 integrally formed on the outer wall 2b of the cylinder block 2 (see FIG. 3). The front end portions of the balancer shafts 17, 18 protrude toward the front side of the cylinder block 2, and chain sprockets 20, 21 are provided at these portions, respectively. On the other hand, an intermediate pulley 15 is attached to the intermediate shaft 14.
An intermediate sprocket 22 is provided inside the cylinder block 2, that is, on the cylinder block 2 side. From the intermediate sprocket 22 of the intermediate shaft 14 to the sprockets 20.21 of the left and right balancer shafts 17.18 and the idler sprocket 2.
3, a timing chain 24 is engaged.

This timing chain 24 has its outer side engaged with the sprocket 20 of the left balancer shaft 17, and its inner side engaged with the sprocket 21 of the right balancer shaft 18, so that the left and right balancer shafts 17 and 18 are They are configured to rotate in opposite directions. Also, this balancer shaft 1
7.18 is rotated at twice the speed of the crankshaft 8,
As shown in FIG. 3, when the piston 6 is at the top dead center or the bottom dead center, the balance weight 178
．． 18a is provided so as to be eccentrically located below the cylinder block 2 side.

Furthermore, the crank pulley 11 of the crankshaft 8 includes:
A belt pulley 2 that is engaged with a transmission belt 28 that drives auxiliary equipment such as an alternator 26 and a water pump 27.
9 is formed.

On the other hand, outside W of the cylinder block 2! A variable displacement type oil pump 30 such as a trochoid type or a gear type is attached to 2b, and this oil pump 30 is connected to the intermediate shaft 14 and rotationally driven by the crankshaft 8. That is, the oil pump 30 is installed at the rear of the intermediate shaft 14.
A journal portion 14a provided at the rear of the intermediate sprocket 22 of the intermediate shaft 14 is rotatably supported by the pump housing 31 of the oil pump 30, and a rear end portion of the journal portion 14a drives the oil pump 30. Axis 3
2 are connected to each other, and a rotor 33 provided on this drive shaft 32
The oil is pumped by the rotation of the cylinder.

The oil path including the oil pump 30 includes an oil suction passage 36 that is connected to the strainer 35 in the oil pan 4 and is formed in the cylinder block 2. It is open to Further, an oil feed passage 37 connected to the valve mechanism, the crankshaft 8, and other lubricating parts is also formed in the cylinder block 2, and this oil feed passage 37 is connected to the oil feed passage 37 formed in the outer wall 2b on the same side of the cylinder block 2. It opens to the oil port 37a. A suction port 30a of the oil pump 30 communicates with the oil suction port 36a of the oil suction passage 36, and a discharge port 30b of the oil pump 30 via the rotor 33 communicates with an oil feed port 37a of the oil feed passage 37.

The oil suction passage 36 has a step formed in the middle so as to supply oil to the oil pump 30 from an oil suction port 36a, that is, a position higher than the suction port 30a of the oil pump 30. The working chamber is configured to be filled with oil. Further, a discharge port 30b of the oil pump 30 is formed to extend upward from the rotor 33, and communicates with a feed passage 37, and this oil feed passage 37 communicates with an oil filter 38, and then passes through the main gear rally 39. It passes through and connects to each lubricating part.

Furthermore, a regulator valve 41 is interposed in the middle of a relief passage 40 communicating from the discharge port 30b of the oil pump 30 to the suction port 30a.

In this regulator valve 41, a spring 41b is compressed at the back of a plunger 41a that receives discharge pressure, and when the discharge pressure exceeds a set pressure due to the biasing force of this spring 41b, the plunger 41a operates to open the relief passage 40. A part of the discharged oil is provided within the pump housing 31 to be relieved to the suction port 30a.

On the other hand, the alternator 26 is attached to the front part of the oil pump 30, and a cooling fan 26a built in the alternator 26 blows cooling air through the air vents 26.
It is configured to cool the oil blown out from b and passing through the oil pump 30 and oil filter 38 to lower its temperature (see FIG. 2).

According to the above configuration, the crankshaft 8 rotates as the engine 1 operates, and its driving force is transmitted via the timing belt 10 to the intermediate shaft 14 for driving the balancer shafts 17 and 18. The rotation causes the rotor 33 of the oil pump 30 to rotate, and the oil in the oil pan 4 of the cylinder block 2 is transferred from the suction port 30a to the strainer 35.
, the oil is sucked in through the oil suction passage 36, pressurized, and discharged through the discharge port 30b.
From there, it is supplied to each part via an oil feed passage 37 in the cylinder block 2, an oil filter 38, and a main gear rally 39. The discharge pressure is kept constant by the operation of a regulator valve 41 provided integrally with the oil pump 30.

At that time, the oil pump 30 is unitized and mounted on the outer wall 2b of the cylinder block 2, and its drive is driven by the camshaft 9.
Since a power transmission mechanism for driving the balancer shaft 1'7.18 is utilized, the crankshaft 8 can be driven without extending the length of the crankshaft 8, and the overall length of the engine can be shortened. Furthermore, since the oil pump 30 is not disposed within the oil pan 4, there is increased freedom in the layout of the oil pan 4.

In addition, a regulator valve 41 for keeping the discharge pressure of the oil pump 30 constant is integrated into the pump housing 31, and its relief [1 piece] is provided. -7,3゜1
81°30a. 4-93, the outside of this pump housing 31 and cylinder block 2! J2
In b, there is no need to form a relief passage to the oil pan 4, and it is sufficient to form only two passage openings, one on the suction side and the other on the discharge side.

Further, in the embodiment described above, the drive shaft 32 of the oil pump 30 connected to the intermediate shaft 14 is supported in a cantilevered manner at one location of the journal portion 14a of the intermediate shaft 14, and the drive shaft 32 is extended rearward. It is provided so as to be connected to the rotor 33. Therefore, on the outer wall 2b of the cylinder block 2, in addition to the alternator 26, eight engine auxiliary machines are disposed on the front side of the cylinder block 2 to be driven by the crankshaft 8, and the oil pump 30 is connected to the cylinder block. 2, the drive shaft 32 is made longer and the distance from the front end of the cylinder block 2 is increased to avoid interference with the auxiliary machinery. This length is
It is appropriately set in relation to the opening positions of the oil absorption passage 36 and the oil supply passage 37.

In the above embodiment, the oil pump 30 is driven by the intermediate shaft 14 engaged with the timing belt 10, but in addition, a mechanism in which the power of the crankshaft 8 is transmitted by a power transmission member is also provided. The design can be changed as appropriate so that it can be used and driven.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of an engine equipped with an oil pump device according to an embodiment of the present invention, Fig. 2 is a side view of the main parts of the engine partially shown in section, and Fig. 3 is a direction perpendicular to the crankshaft. FIG. 4 is a plan view of the main part of the cylinder block shown partially in section. 1...Engine 2...Cylinder block 2b...Outer wall 4...
・・Oil pan 8・・・・Crankshaft 14・
...Intermediate shaft 10...Timing belt 17.18...Balancer shaft 24...Timing chain 30...Oil pump 30a... ... Suction port 30b ... Discharge port 31 ... Pump housing 32 ... Drive shaft 33 ... Rotor 35 ... Strainer 36 ... ...Oil absorption passage 37...Oil supply passage

Claims (1)

[Claims] (1) The oil suction port of the oil suction passage connected to the oil pan and the oil feed port of the oil feed passage connected to each lubricating part are opened on the outer wall of the cylinder block of the engine, and the oil pump is installed on the outer wall of the cylinder block. , the oil inlet and oil inlet of the cylinder block are connected to the inlet and outlet of the oil pump, respectively, and the relief passage of the regulator valve of this oil pump is connected between the oil inlet of the cylinder block and the inlet of the oil pump. An engine oil pump device characterized in that it is connected.