JPS6130125B2 - - Google Patents

Abstract

Gutter-forming ribs 74, 79 are arranged on the valley walls 19 and 20 of a V-type internal combustion engine to intercept excess lubricant passing downwardly to the oil sump 24 and direct it firstly to the individual valve actuating cams 56 of the camshaft 57 and secondly to the lower portions of the piston skirts 31 extending below their respective cylinders 17 at the bottom of their travel. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine with lubrication means.

In a V-shaped internal combustion engine, cylinders with walls forming two V-shaped cylinder banks are used.
It is customary for the block to have valleys between the banks and a crankcase below. A piston is disposed within the cylinder and has a skirt that engages the cylinder wall, and the piston is connected to a crankshaft for reciprocating movement within the cylinder. Generally, a cylinder is a valve that controls access to the combustion chamber.
and means for actuating a valve longitudinally disposed in the valley between the banks and engaging a cam of a camshaft driven by the crankshaft.
Furthermore, in the conventional system, a pressure lubrication system is installed, which distributes the lubricating oil to the oil under the engine crank chamber.
From the sump to the moving parts of the valve actuation means, excess oil is directed, at least in part, into the sump by open passages through the valleys between the cylinder banks, where it flows down its walls and through the crank chamber.・Fall into the sump.

In the above-mentioned engine, means are specifically provided for the lubrication of the cam of the camshaft that operates the valve mechanism and the lubrication of the cylinder wall and the piston skirt that reciprocates in engagement with the cylinder wall within the cylinder; Or it actually exists. In some cases, the above-mentioned parts are appropriately lubricated by the discharge or splashing of oil due to the rotation of the engine crankshaft and its associated mechanisms. In other cases, a separate pressure lubrication system is provided to spray oil onto the camshaft cam and cylinder wall or piston skirt to properly lubricate those parts. Since the provision of such additional lubrication means generally increases the cost of engine construction, the crankshaft discharge oil and splash oil that is distributed within the engine crank chamber and generally rises into the valleys of the cylinder banks does not provide adequate lubrication. Use only if not available.

In the present invention, walls forming two V-shaped cylinder banks, a valley between both banks and a crank chamber below, a skirt connected to the crankshaft and engaging the cylinder wall for reciprocating movement within the cylinder. a piston in a cylinder having a piston, a valve controlling entry into and exit from each cylinder, a valve longitudinally disposed in the valley and engageable with a cam of a camshaft connected to the crankshaft and rotatable to actuate the valve. actuation means, means for lubricating the valve actuation means and for allowing excess lubricating oil to flow down the valley walls to the crankcase and back to the oil sump below, and disposed along a portion of the wall of the section. To provide an internal combustion engine having trough-forming ribs that capture return lubricating oil flowing down a wall and send it to operating parts of the engine below to lubricate the parts.

The trough-forming ribs can easily be integrally cast with the valley walls at suitable locations, such as the valve lifter directly above the camshaft to lubricate the cam of the camshaft in the valley. Each lifter supporting
A trough-forming rib can be integrally cast around the gearry boss, and the pistons are provided with skirts that extend into the portion of the crankcase below the valley in the lower portion of the piston's travel. In order to lubricate these skirts when extending below the bottom of each cylinder, gutter-forming ribs can be integrally cast into the walls of the valley near the lower end of the skirts just above the bottom of each cylinder. The provision of troughs by means of cast-in ribs can be carried out during the original casting of the cylinder block, so that there is little or no additional cost.

An example of a preferred embodiment of the present invention will be exemplarily described below with reference to the drawings.

In the accompanying drawings, the reference numeral 10 generally designates a six-cylinder V-type internal combustion piston engine intended primarily for use in motor vehicles. Engine 10 includes a cast and machined cylinder block 11;
The block includes a lower crankcase section 12 defining a crankcase 14, which (as viewed from the rear of the engine and thus in the opposite direction from the direction of FIG. 1) is located on the left and right sides of the cylinder, respectively. Banks 15 and 16 are supported thereon. cylinder bank 15
and 16 are arranged in a V-shape with a bank angle of 60°. Inner walls 19 and 20 of left and right cylinder banks
each define a generally V-shaped open section in the middle of the cylinder, commonly referred to as a trough 21.

An oil pan 23 attached to the bottom of the crankcase portion 12 of the cylinder block serves as a sump 24 for containing lubricating oil for the engine, and surrounds the lower portion of the crank chamber 14. The crankshaft 25 is rotatably supported in the crank chamber by a cylinder block in a conventional manner, with a piston 29 movable reciprocally within each one of the six cylinders 17 of the engine.
It includes a plurality of crank throws (arms) 27 connected by connecting rods 28 to the crank arm.

The pistons include a skirt 31 that fits into the wall of each cylinder 17 and forms a bearing surface that supports thrust loads acting between the piston and the cylinder wall. When the crankshaft rotates, the pistons reciprocate in their respective cylinders and move between top and bottom dead center positions. At bottom dead center, the lower part of the piston skirt 31 extends below the lower edge of the respective cylinder and into the upper part of the crank chamber. This is shown in phantom lines for the pistons shown in the right cylinder bank 16 in FIG. 1, and in solid lines for the center cylinder in FIG.

The upper ends of the cylinders 17 are closed by left and right bank cylinder heads 32 and 33 attached to the upper ends of cylinder banks 15 and 16, respectively. The cylinder bank includes externally mounted exhaust manifolds 35 and 36 of conventional type, the manifolds (only one being shown) having air supply valves 3
Secondary air can be supplied from 7. An intake manifold 39 mounted between cylinder heads 32 and 33 covers the open top of valley 21 and supports a carburetor 40 to which an air cleaner 41 is mounted.

The cylinder head sucks each cylinder.
Each has an inlet and an exhaust port for communicating with the exhaust manifold and other parts of the engine intake/exhaust system. Each port is controlled by intake and exhaust valves 45 and 47, respectively, operated by a valve system including a valve spring 48, a rocker arm 49, a push rod 51, and a hydraulic valve lifter 52. The valve lifter is formed as an extension of the valley walls 19 and 20 and has a bore 53 in a boss 55 defining the valve lifter gearing.
It is contained within. The valve lifter 52 is
It is actuated by a cam 56 on a camshaft 57 rotatably supported within the cylinder block and extending longitudinally through the valley 21 and below the lifter gear rally boss 55. Driven gear 59 is connected by a drive chain 60 to a crankshaft drive gear 61, thus providing a drive connection to the engine camshaft.

Engine 10 includes a pressure lubrication system that includes an oil pump 63 driven from a distributor drive gear 64 located near the rear end of the camshaft and connected to a suction strainer 65 for drawing oil from an engine oil sump. It has a system. The pump directs oil through various passageways in the engine block and moving parts to oil points including the crankshaft and camshaft bearing journals. Oil is also supplied directly to the valve lifter 52 and from the valve lifter through the push rod to the rocker arm 49, which is closed by a rocker cover 67 mounted on the top of the cylinder head and adjacent suction manifold. Supplied. The oil used to lubricate the various parts of the valve gear, and any excess oil supplied to those parts, is returned to the engine sump by gravity, i.e., it flows down along the top and inside surfaces of the cylinder head, as shown in Figure 1. It flows into the valley 21 through the open space of the push rod between the cylinder head and the suction manifold, shown inwardly of the right-hand cylinder bank, and between its walls 19 and 2.
0 to the lower inner edge of the cylinder, at which point there is an opening 72 through which the oil flows into the crankcase, and then the oil below.
It is returned to the sample.

In accordance with the present invention, excess lubricating oil that is returned from the lubrication at the top of the valve arrangement and flowing down the valley walls is captured, directed to the cams 56 of the camshaft, and then at least partially piston skirt 3
In particular, upper and lower trough-forming rib groups are arranged along the walls 19 and 20 to ensure proper lubrication of the cam, piston skirt and associated cylinder walls towards the inside of the cylinder. As best seen in FIGS. 2-5, there is an upper trough-forming rib group 74 that extends from a location 75 near the top edge of the cylinder block and descends around the lifter gear rally boss 55. A set of ribs is disposed at each cylinder location. Each set of upper ribs 74 is arranged to capture most of the return oil used to lubricate each portion of a respective cylinder location. The oil is lifter gear rally boss 55
through a trough 76 extending around the sides of the camshaft, the trough terminating at a position along an opening 78 directly above each cam 56 of the camshaft.
The collected oil is directed to the cam surface for cam lubrication.

Some of the oil used for lubrication of the camshaft bearing and the oil that has passed through the upper rib group 74 is absorbed into the valley wall 19.
and 20 and is captured near the lower edge of the engine cylinder by lower trough-forming ribs 79, best seen in FIGS. 2 and 6-8. Ribs 79 extend in both longitudinal directions from the plane of adjacent cylinders to form troughs 80;
This collects oil from the immediately outer valley walls of each cylinder and directs it to a V-shaped opening 82 formed in the lower edge of each valley wall that coincides with the lower edge of each cylinder. The oil collected by the trough is directed from there to the outer surface of the lower piston skirt when the piston skirt 31 reaches the bottom of its stroke;
This then lubricates both the piston skirt and the respective cylinder when the piston is raised. Lower trough-forming ribs 79 are also arranged in sets and have the effect of collecting oil flowing down the wall at each cylinder location, which oil is primarily absorbed by the actuating elements of the valve gear and other components associated with each cylinder. The oil used to lubricate the moving parts and the collected oil is used to properly lubricate the internal piston skirt 31.

Based on the present invention, upper and lower gutter-forming rib groups are provided,
Since each set of ribs is attached to its respective cylinder location, it can be provided entirely as part of the engine block casting, thereby providing the lowest manufacturing costs and without the use of additional oil. , provides additional lubrication of the engine's moving parts, especially the camshaft and piston skirt.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a V-type internal combustion engine according to the present invention, FIG. 2 is a longitudinal sectional view showing the lubricating means for each operating part of the engine shown in FIG. 1, and FIG. 3 is a sectional view of the camshaft lubricating means. FIG. 4 is a fragmentary top view of a part of the engine block seen in the direction of the arrow along line 3-3 in FIG. 1 showing the features, and FIG. 4 is a fragmentary sectional view taken along line 4 in the direction of the arrow, and FIG. 5 is a fragmentary sectional view taken along line 5-5 of FIG. , FIG. 6 is a fragmentary sectional view of the engine block viewed downward from the plane 6--6 of FIG. 1, showing features of the piston skirt lubrication means;
The figure shows the configuration of the lower gutter forming rib group at 7-7 in Figure 6.
7 is a fragmentary sectional view taken along line 7 in the direction of the arrow; FIG. 8 is a fragmentary sectional view taken along line 8-8 of FIG. 6 in the direction of the arrow, further showing the configuration of the lower gutter forming rib It is. [Explanation of symbols of main parts], 17...Cylinder, 19...Wall, 20...Wall, 55...Wall, 21
... Valley part, 29 ... Piston, 31 ... Working part, skirt, 52 ... Lifter, 55 ... Gear rally wall, 56 ... Working part (cam), 57 ... Camshaft, 59 ... Gutter forming rib , 74...Gutter forming rib,
79...Gutter forming rib.

Claims (1)

[Claims] 1. A single cylinder block with walls forming two V-shaped cylinder banks, a valley between both banks and a crank chamber below, and a skirt that fits into the cylinder wall. A piston in the cylinder that is connected to the crankshaft for reciprocating movement within the cylinder, a valve that controls entry and exit into and out of each cylinder, and a valve that is arranged longitudinally in the valley and connected to the crankshaft to operate the valve. Valve actuation means engageable with the cam of the rotatable camshaft, means for lubricating the valve actuation means and for allowing excess lubricating oil to flow down the valley wall to the crankcase and back to the oil sump below. In an internal combustion engine with:
Gutter-forming ribs 74; 59 are integrally formed with and extend along the valley walls 55; 19 and 20 to capture return lubricating oil flowing down the walls at each cylinder location and to collect it. lubricating the underlying working parts 56; 31 of the engine associated with the respective cylinder in each said position;
An internal combustion engine characterized by 2. In the internal combustion engine according to claim 1, wherein the valley includes the valve/lifter/gear rally, and the camshaft is longitudinally disposed in the valley below the lifter/gear rally: trough-forming ribs extend along the lifter gear rally walls in the valleys of each cylinder location to capture lubricant flowing down the walls of each of said locations, and are disposed below the lifter gear rally and are disposed at each of said locations. An internal combustion engine characterized in that the lubricant is delivered to each cam of a camshaft associated with a cylinder of the engine. 3. In an internal combustion engine according to claim 1 or 2, in which the lower part of the piston skirt extends below the cylinder bottom in the lower part of its stroke: said trough-forming rib is provided at each cylinder position. It is located along the lower part of the valley wall of
It captures the return lubricant flowing along the wall, directs the lubricant to a location on the inner edge near the bottom of each cylinder, and directs the captured lubricant to the bottom of the skirt as the skirt extends down the cylinder in the lower portion of its travel. An internal combustion engine, characterized in that the skirts of the associated pistons are lubricated.