JPH0322496Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement in a lubricating device for an engine.

(Prior art) In general, as a lubricating device for supplying lubricating oil to an engine, an oil pump is disposed near the front end of the crankshaft, as seen in Utility Model Publication No. 50331/1983, for example. The oil pump is driven by a gear disposed in the oil pump. However, in the above-mentioned structure, the crankshaft is lengthened by an amount corresponding to the width of the oil pump, which becomes an obstacle in reducing the overall length of the engine.

In addition, an oil pump is installed inside the oil pan,
A system in which this oil pump is driven by a crankshaft via a chain or the like has also been adopted, but this system has a problem in that the degree of freedom in the shape of the oil pan is reduced.

Furthermore, when the oil pump is placed on the side of the cylinder block, auxiliary equipment is installed in this area, so the widthwise dimension of the engine increases due to the installation of this auxiliary equipment. is not desirable.

In addition, in response to the change in the oil pump mounting position, the oil in the oil pump flows out to the drain side after the engine is stopped, which prevents oil from being sent to the oil pump when the engine is restarted. It takes time for oil to flow into the supply path and into the oil pump, which lengthens the time it takes to start supplying oil to each lubricating part.During this time, the lubrication condition worsens due to lack of oil, which can cause seizure or abnormal noise. There are some problems.

(Purpose of the invention) In view of the above circumstances, the present invention is designed to shorten the overall length of the engine and increase the degree of freedom in the shape of the oil pan by installing the oil pump on the side of the cylinder block without affecting the installation of auxiliary equipment. It is an object of the present invention to provide an engine lubricating device that can promptly start supplying oil when starting the engine.

(Structure of the invention) The lubricating device of the invention has an oil pump attached to the side of the cylinder block, and the oil pump is driven from the crankshaft via a power transmission member and a drive wheel linked to the drive shaft of the oil pump. In addition, the drive shaft is installed in the pump housing along the crankshaft direction, and an oil pump rotor is provided at the rear end thereof, and an oil feed port is provided for the oil pump that opens in the outer wall of the cylinder block. A part of the oil feed passage communicating from the oil strainer is formed as an inclined passage of a predetermined length that is higher than the oil feed port and connected to the oil feed port inside the cylinder block. That is.

(Effects of the invention) According to the invention, the overall length of the engine can be shortened by attaching the oil pump to the outer wall of the cylinder block, extending its drive shaft, and providing the rotor at the rear end. , the degree of freedom in the oil pan shape can be increased, and by lengthening the drive shaft and moving the rotor part away from the front end of the cylinder block, there is no interference with auxiliary equipment installed in this part, and the overall layout of the engine can be improved. This makes it possible to make the settings more compact.

In addition, by forming a part of the oil feed passage in the cylinder block so that it has an inclined part of a predetermined length higher than the oil feed port to the oil pump, even when the engine is stopped, the oil pump's working chamber and Oil remains on the inclined portion of the oil supply path, which shortens the time required to start oil supply upon restart, and prevents seizure and abnormal noise.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic front view of the engine, FIG. 2 is a side view of essential parts of the engine partially shown in section, and FIG. 3 is a sectional front view taken in a direction perpendicular to the crankshaft.

In the engine 1, a cylinder head 3 is fastened onto a cylinder block 2, an oil pan 4 is mounted on the lower part of the cylinder block 2, and a head cover 5 is mounted on the cylinder head 3, respectively. A piston 6 is fitted into the cylinder bore 2a of the cylinder block 2, and the piston 6 is connected to the crankshaft 8 by a connecting rod 7 (see FIG. 3).

One end of the crankshaft 8 is connected to the cylinder block 2.
A crank pulley 11 is integrally fixed to the crankshaft 8 and is engaged with a timing belt 10 as a power transmission member for driving a camshaft 9 of a valve mechanism. The timing belt 10 is engaged with a cam pulley 12 fixed to the camshaft 9 and two idler pulleys 13, 13, and drives the camshaft 9.
A part is engaged with the intermediate pulley 15 of the intermediate shaft 14,
This intermediate shaft 14 is driven at the same time.

Further, a pair of balancer shafts 17 and 18 are disposed on the left and right sides of the cylinder block 2. These left and right balancer shafts 17, 18 are equipped with eccentrically formed balance weights 17a, 18a, and are housed in balancer cases 19, 19 that are 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, the intermediate shaft 14 is provided with the inner side of the intermediate pulley 15, that is, the cylinder block 2.
An intermediate sprocket 22 (drive wheel) is provided on the side. A timing chain 24 is engaged 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 23.

This timing chain 24 is the left balancer shaft 1
The outer side engages with the sprocket 20 of the right balancer shaft 18, and the inner side engages with the sprocket 21 of the right balancer shaft 18, so that the left and right balancer shafts 1
7 and 18 are configured to rotate in opposite directions to each other at twice the speed of the crankshaft 8.

Furthermore, the crank pulley 1 of the crankshaft 8
1 is formed with a belt pulley 29 to which a transmission belt 28 that drives auxiliary devices such as an alternator 26 and a water pump 27 is engaged.

On the other hand, an oil pump 30 of a variable displacement type such as a trochoid type or a gear type is attached to the outer wall 2b of the cylinder block 2, and this oil pump 30 is connected to the intermediate shaft 14 and rotationally driven by the crankshaft 8. be done. That is, the oil pump 30 is disposed at the rear of the intermediate shaft 14, and the 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. Oil pump 30 at the rear end of 14a
A drive shaft 32 is connected to the drive shaft 3.
The oil is pumped by the rotation of a rotor 33 provided at the rear end of the rotor 2.

The oil path including the oil pump 30 is as follows:
An oil feed path 36 connected to a strainer 35 in the oil pan 4 is formed in the cylinder block 2,
This oil feed passage 36 opens into an oil feed port 36a formed in the outer wall 2b of the cylinder block 2. Further, an oil pressure passage 37 connected to the valve mechanism, the crankshaft 8, and other lubricating parts is also formed within the cylinder block 2, and this oil pressure passage 37 is connected to the oil pressure passage 37 formed on the outer wall 2b on the same side of the cylinder block 2. It opens to the pressure feeding port 37a.

The suction port 30a of the oil pump 30 communicates with the oil feed port 36a of the oil feed path 36, and the discharge port 30b of the oil pump 30 via the rotor 33 communicates with the oil feed port 37a of the oil pressure feed path 37.
is connected to. Further, the discharge port 30b of the oil pump 30 is formed to extend upward from the rotor 33, and the oil pressure passage 37 communicates with an oil filter 38, and then passes through a main gear rally 39 to connect to each lubricating part. be.

A step portion 36b is formed in the oil feed path 36 so as to supply oil to the oil pump 30 from a position higher than the oil feed port 36a, that is, the suction port 30a of the oil pump 30. An inclined passage having a predetermined length is formed with respect to the oil supply passage 36a. The height of the stepped portion 36b is set to about the center position of the rotor 33, so that even when the engine is stopped, oil remains in the working chamber of the rotor 33 and the inclined passage portion of the oil feed path 36. It is configured as follows. The oil supply path 36 is formed by drilling upward from the bottom of the cylinder block 2 and obliquely upward from the outside.

Furthermore, the discharge port 30b of the oil pump 30
A regulator valve 41 is interposed in the middle of a relief passage 40 that communicates with the suction port 30a. This regulator valve 41 has a spring 41b 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 the spring 41b, the plunger 4
1a is provided to open the relief passage 40 and relieve a portion of the discharged oil to the suction port 30a.

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. Due to the rotation, the rotor 33 of the oil pump 30 rotates, and the oil in the oil pan 4 of the cylinder block 2 is sucked from the suction port 30a through the strainer 35 and the oil feed path 36, and is then pressurized and discharged. The oil is supplied from the outlet 30b to each part via the oil pressure passage 37 in the cylinder block 2, the oil filter 38, and the main gear rally 39.

At this time, the oil pump 30 is assembled into a unit and mounted on the outer wall 2b of the cylinder block 2, and its drive utilizes a power transmission mechanism for driving the camshaft 9 and balancer shafts 17, 18, so that The drive can be performed without extending the length,
The overall length of the engine can be shortened. Furthermore, since the oil pump 30 is not disposed within the oil pan 4, the degree of freedom in the shape and layout of the oil pan 4 is increased.

Further, when the engine is stopped, the stepped portion 36b of the oil feed passage 36 is formed higher than the oil feed port 36a to the oil pump 30, and the oil in the working chamber of the oil pump 30 in the portion lower than the stepped portion 36b is Outflow to the oil pan 4 side is prevented. Therefore, when the engine is restarted, oil can be sucked quickly from the oil pan 4 through the strainer 35, and oil can be pumped to each lubricating part quickly, improving lubrication performance.

Furthermore, in the above embodiment, the drive shaft 32 of the oil pump 30 connected to the intermediate shaft 14 is
The drive shaft 32 is supported in a cantilever manner at one location of the journal portion 14a, and is provided so that the drive shaft 32 is extended rearward and connected to the rotor 33. Therefore, the alternator 2 is mounted on the outer wall 2b of the cylinder block 2.
In addition to 6, various engine accessories are arranged on the front side of the cylinder block 2 to be driven by the crankshaft 8. is made longer and the distance from the front end of the cylinder block 2 is increased to avoid interference with the auxiliary equipment. This length is appropriately set in relation to the opening positions of the oil feed path 36 and the oil pressure feed path 37.

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 is returned to the suction port 30a for the rotor 33. There is no need to form a relief passage to the oil pan 4 in the pump housing 31 and the outer wall 2b of the cylinder block 2.
It is only necessary to form two passage openings, one on the suction side and one on the discharge side.

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

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of an engine equipped with a lubricating 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 cross section, and Fig. 3 is a schematic front view of an engine equipped with a lubricating device according to an embodiment of the present invention. FIG. 3 is a cutaway sectional front view. 1...Engine, 2...Cylinder block, 2b...
Outer wall, 4...oil pan, 8...crankshaft, 14...
Intermediate shaft, 10...Timing belt, 24...Timing chain, 30...Oil pump, 30a...Suction port, 30b...Discharge port, 31...Pump housing, 32...Drive shaft, 33...Rotor, 35...Strainer, 36...Oil feed Supply path, 36a...Oil feed port, 38...Oil filter.

Claims (1)

[Scope of utility model registration request] In an engine with an oil pump attached to the side of the cylinder block, the oil pump is driven from the crankshaft via a power transmission member and a drive wheel linked to the drive shaft of the oil pump, and the drive shaft is connected to the pump. The housing extends in the direction of the crankshaft, and is provided with an oil pump rotor at its rear end.Furthermore, an oil supply port for the oil pump is opened on the outer wall of the cylinder block, and the oil is supplied from the oil strainer. A part of the oil supply path that communicates with the mouth is
A lubricating device for an engine, characterized in that an inclined passage of a predetermined length is formed inside a cylinder block, higher than the oil supply port, and connected to the oil supply port.