JPH0526020A - Lubricating oil passage structure for engine - Google Patents

Abstract

PURPOSE:To realize a forced lubricating system for engine at low cost by providing passage holes so as to be opened to the connecting surface of each part, and providing a connecting groove for communicationally connecting the passage holes to each other on the connecting surface. CONSTITUTION:A connecting groove 27 connecting a horizontal hole 26 on a crank case 3 side to a horizontal hole 24 on a crank case cover 13 side is provided on the connecting surface with the crank case cover 13 of the crank case 3. A connecting groove 29 connecting a bank hole 25 to a head bolt through hole 28 is provided on the connecting surface with a cylinder block 4 of a cylinder head 6. Since the respective passage holes are allowed to mutually communicate and connect by the groove provided on the gasket connecting surface of each part, a lubricating oil passage complicatedly curved can be comparatively easily formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil passage structure for an engine.

[0002]

2. Description of the Related Art A single-cylinder small-sized general-purpose engine is designed to reduce the manufacturing cost as much as possible. Therefore, a method of sending oil mist to a cylinder head by utilizing pressure pulsation between a crank chamber and a rocker arm chamber is used. May be used for internal lubrication.

By the way, in the case of a V-type engine in which two cylinder banks are arranged in a V-shape, it is difficult to sufficiently lubricate both cylinders by such a lubrication system, and therefore forced lubrication is required. Is preferred.

[0004]

However, in the case of a V-type engine, the oil passage is generally liable to be complicated, and therefore, if forced lubrication is attempted, the manufacturing cost is inevitably increased. The present invention has been devised to eliminate such inconvenience, and its main object is to provide a lubricating oil passage structure for an engine that can realize forced lubrication at a relatively low cost. Especially.

[0005]

According to the present invention, there is provided a crankcase and a crankcase cover,
Alternatively, a lubricating oil passage structure for an engine configured to be integrated by joining respective portions formed by dividing each other, such as a cylinder block and a cylinder head, through a gasket, While forming a passage hole so as to open in the joint surface of each of the above parts,
This is achieved by providing a lubricating oil passage structure for an engine, characterized in that a connecting groove that connects the openings of these passage holes is provided in the joint surface.

[0006]

According to this structure, the linear passage holes appropriately formed in the respective portions are connected to each other through the connecting groove formed in the gasket joint surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings.

1 and 2 show an outline of a V-type engine 1 constructed according to the present invention. The V-type engine 1 is configured as an air-cooled engine in which a crankshaft 2 is horizontally arranged, and a cylinder block 4 formed integrally with the crankcase 3 in a V shape, and a gasket on an upper end surface of the cylinder block 4. 5, a rocker shaft holder 8 also joined to the upper surface of the cylinder head 6 via a gasket 7, and a rocker shaft 10 supported by the rocker shaft holder 8 to pivotally support a rocker arm 9. A head cover 11 for covering the upper surface of the cylinder head 6, and a crankcase 3
It has a crankcase cover 13 joined to the end face in the crankshaft direction via a gasket 12, and an oil filter 14 attached to the side surface of the crankcase 3.

The crankcase cover 13 is internally provided with a trochoid pump 15 gear-coupled to the crankshaft 2, and a suction passage 16 and a discharge passage 17 for the trochoid pump 15. The lubrication is stored in the bottom of the crankcase 13. The trochoid pump 15 pumps out oil and sends it to the oil filter 14 on the side of the crankcase.

The crankcase cover 13 has a transverse hole 19 bored from the outlet of the oil filter 14 toward the crankshaft bearing 18, an annular groove 20 recessed in the inner peripheral surface of the crankshaft bearing 18, and the annular groove. 20, a diagonal hole 21 that is formed obliquely upward, a vertical hole 23 that penetrates the cam bearing 22 from the upper surface of the crankcase cover 13 and that is formed downward and connects to the oblique hole 21, and a crankcase. The cover 13 has a horizontal hole 24 bored from the joint surface with the crankcase 3 toward the upper end of the vertical hole 23.
Each of these holes is formed so as to communicate with each other. The uppermost opening of the vertical hole 23 is closed by the plug P.

A bank hole 25 is formed in parallel with the cylinder axis from the cylinder head joint surface of the cylinder block 4 toward the crankcase 3. A horizontal hole 26 is formed so as to connect to the bottom of the bank hole 25 from the surface of the crankcase 3 that is joined to the crankcase cover 13 (FIG. 3). Further, on the joint surface of the crankcase 3 with the crankcase cover 13, the horizontal hole 26 on the crankcase 3 side and the crankcase cover 13 described above are provided.
A connection groove 27 is formed to connect with the horizontal hole 24 on the side.

A bank hole 25 and a head bolt insertion hole 28 are formed on the joint surface of the cylinder head 6 with the cylinder block 4.
A connecting groove 29 for connecting between and is provided (FIG. 4).
The rocker shaft holder 8 is fixed together with the cylinder head 6 by a head bolt 30. The rocker shaft holder 8 has a rocker shaft support hole 31 and a knock pin hole 32 formed at both ends thereof, and a protrusion 33 for maintaining a gap between rocker arms (not shown) in the center thereof.
And a head bolt insertion hole 34 are formed, and the rocker shaft support holes 3 at both ends from the joint surface with the cylinder head 6 are formed.
The oil hole 35 is formed toward 1 (FIG. 6). Also,
A connecting groove 36 that connects the head bolt insertion hole 28 in the cylinder head and one oil hole 35 is provided in the joint surface of the cylinder head 6 with the rocker shaft holder 8 (FIG. 5). The rocker shaft 10 is formed with an oil hole 37 for supplying lubricating oil to the pivotal support of the rocker arm.

The lubricating oil pumped up by the trochoid pump 15 and passed through the oil filter 14 flows into the crankshaft bearing 18 from the traverse hole 19. And crankshaft 2
The oil is supplied to the crank pin 39 and the other crank bearing via an oil passage 38 provided inside the annular groove 20.
Oblique hole 21, vertical hole 23, cam bearing 22, horizontal hole 24
Through to the joint surface with the crankcase 3, and the connecting groove 27
Are distributed to the left and right cylinder blocks 4.

The lubricating oil flowing into each bank hole 25 through the connection groove 27 and the horizontal hole 26 on the crankcase 3 side is connected to the head bolt 30 and the insertion hole 28 via the connection groove 29 on the joint surface with the cylinder head 6. Flows into the gap. Then, it flows from the head bolt insertion hole 28 into the oil hole 35 of the rocker shaft holder 8 and the oil hole 37 of the rocker shaft 10 through the connecting groove 36 on the rocker shaft holder joint surface of the cylinder head 6, and returns after passing through the pivotal support portion of the rocker arm 9. It is returned to the crankcase via the oil passage 40.

[0015]

As described above, according to the present invention, a linear passage hole which can be easily drilled by machining is appropriately provided in the thick portion of each portion and recessed in the gasket joint surface of each portion. Since the grooves connect the passage holes to each other, it is possible to relatively easily form the complicatedly twisted and bent lubricating oil passage. Therefore, there is a great effect in realizing the forced lubrication system of the engine at low cost.

[Brief description of drawings]

FIG. 1 is a partial schematic elevational view of a V-engine constructed in accordance with the present invention.

FIG. 2 is a partial sectional view taken along the line II of FIG.

FIG. 3 is a partial end view taken along line III of FIG.

FIG. 4 is a partial end view taken along line IV of FIG.

5 is a partial end view taken along line V of FIG.

FIG. 6 is a view on arrow VI in FIG.

[Explanation of symbols]

 1 V-type engine 2 Crankshaft 3 Crankcase 4 Cylinder block 5 Gasket 6 Cylinder head 7 Gasket 8 Rocker shaft holder 9 Rocker arm 10 Rocker shaft 11 Head cover 12 Gasket 13 Crankcase cover 14 Oil filter 15 Trochoid pump 16 Suction passage 17 Discharge passage 18 Crank bearing 19 Traverse hole 20 Annular groove 21 Oblique hole 22 Cam bearing 23 Vertical hole 24 Horizontal hole 25 Bank hole 26 Horizontal hole 27 Connection groove 28 Head bolt insertion hole 29 Connection groove 30 Head bolt 31 Support hole 32 Knock pin hole 33 Projection part 34 Head bolt insertion hole 35 Oil hole 36 Connection groove 37 Oil hole 38 Oil passage 39 Crankpin 40 Return oil passage

Claims (1)

Claims: 1. A crankcase and a crankcase cover,
Alternatively, a lubricating oil passage structure for an engine configured to be integrated by joining respective portions formed by dividing each other, such as a cylinder block and a cylinder head, through a gasket, For an engine characterized in that a passage hole is bored so as to open to the joint surface of each portion, and a connecting groove for communicating and connecting the passage holes is formed in the joint surface. Lubricating oil passage structure.