JPH0627806Y2 - Lubrication structure of mechanical turbocharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lubrication structure for a mechanical supercharger in an engine equipped with the mechanical supercharger.

(Prior Art) In an engine equipped with a mechanical supercharger, lubrication of a supercharger rotating at high speed is one of important issues. When attempting to mount a supercharger in a limited space, the supercharger cannot always be arranged at a position where an oil passage for lubrication can be conveniently routed. If the oil passage becomes long or has a complicated path, it will hinder the compactness of the engine and increase the oil pressure loss. For example, when a mechanical supercharger is mounted on a V-type engine, the space is effectively used to form the engine compactly. Therefore, as described in Japanese Utility Model Laid-Open No. 61-5330, Although it is considered to arrange a supercharger between banks, it is difficult to arrange the oil passage compactly in such a structure because of a large space limitation.

(Purpose of the Invention) The present invention has been made in view of the above problems.
An object of the present invention is to provide a mechanical supercharger between banks of a mold engine, and to make the oil passage for lubrication of the mechanical supercharger short and compact.

(Structure of the Invention) The present invention is a lubrication structure for a mechanical supercharger arranged between banks of a V-type engine, in which a blow-by chamber is formed in an upper part between banks of an engine block, and the blow-by chamber is vertically moved. A boss portion penetrating to the blow-by chamber, the mechanical supercharger is fixed to a connecting portion formed on the upper surface of the blow-by chamber via a bracket, and extends from a main gallery provided below the blow-by chamber of the engine block. An oil inlet passage communicating with the lubrication portion of the mechanical supercharger through the connection portion and the bracket-side connection portion that is connected to the connection portion and the connection portion and the bracket side extending from the lubrication portion; An oil outlet passage communicating with the blow-by chamber via a connecting portion on the engine block side is provided, thereby achieving the above object.

(Operation) By mounting the mechanical supercharger between the banks of the V-type engine to the upper surface connecting portion of the blow-by chamber formed between the banks of the engine block via the bracket,
The lubrication part of the mechanical supercharger is close to the oil gallery inside the engine block. Moreover, since the oil passage for supplying the lubricating oil to the mechanical supercharger is formed by utilizing the boss portion penetrating the blow-by chamber formed in the engine block and the connecting portion between the block side and the bracket side, the oil passage Is simple and compact,
Oil pressure loss is reduced.

(Example) Hereinafter, an example will be described with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention applied to a V-type 6-cylinder engine in which a mechanical supercharger is arranged between banks.
FIG. 2 is a sectional view taken along the line AA of FIG. Further, FIG. 3 is a sectional view taken along the line BB in FIG. 1, and FIG. 4 is a sectional view taken along the line CC.

In this embodiment, an engine block (cylinder block) 1 is formed with three cylinder bores 2 on the left and right respectively. The left and right cylinder bores 2 are offset by a predetermined amount in the longitudinal direction of the engine, and their axes intersect in a V shape in a cross section perpendicular to the longitudinal direction of the engine. In the engine block 1, the left and right top decks are connected by an upper wall 3, and below the upper wall 3 is formed a blow-by chamber 4 which also serves as an oil return chamber, as shown in FIG.

A bracket 5 for mounting a mechanical supercharger is fixed to the upper surface of the upper wall 3 on the front side by five bolts 6. The bracket 5 has a substantially U-shaped cross section,
The mechanical supercharger 11 and the insulator 12 are supported and fixed to the upper edge flange portions 9 and 10 of the left and right side walls 7 and 8.

Connecting portion 13 for both the bracket 5 and the engine block 1
a, 13b; 14a, 14b are opposed to each other and project in a boss shape, whereby the mechanical supercharger 11 fixed to the bracket 5 is lifted upward. The mechanical supercharger 11 is fixed to the flange portions 9 and 10 as described above, and is arranged at a distance from the bottom surface of the bracket 5.

At the upper part of the blow-by chamber 4 formed below the upper wall 3 of the engine block 1, blow-by gas is sent toward the cylinder head 15 and the cylinder head 1
The blow-by passage 16 for collecting the return oil from 5 is opened. A main gallery 17 for oil supply extending in the longitudinal direction of the engine is formed immediately below the blow-by chamber 4.

In this embodiment, the bracket 5 for mounting the mechanical supercharger 11 on the engine block 1 and the connecting portions 13a, 13b, 14a, 14b of both the engine block 1 are used to lubricate the mechanical supercharger 11 with an oil inlet. A passage 18 and two oil outlet passages 19 and 20 are formed. Of these, the oil inlet passage 18 is connected to the front side connecting portion 13a,
14a, the lower end thereof penetrates the front side boss portion 21 that vertically penetrates the blow-by chamber 4 of the engine block 1 to communicate with the main gallery 17 as shown in FIG. 2, and the upper portion of FIG. As shown in FIG. 3, it is opened to the connecting surface 23 on the side of the bracket 5 through a through hole 22 penetrating the bottom of the bracket 5. The one oil outlet passage 19 is also connected to the front side connecting portions 13a and 14a.
The connecting surface 23 at which the oil inlet passage 18 opens
It is provided on the side opposite to and the lower end opens to the blow-by chamber 4. The other oil outlet passage 20 is provided in the rear-side connecting portions 13b and 14b and opens straight into the blow-by chamber 4. The connecting surface 2 of the oil inlet passage 18
The opening to 3 forms a tubular pin 2 which forms an orifice
It is connected to the mechanical supercharger 11 via 4. Also,
The upper openings of the oil outlet passages 19 and 20 are also connected to the mechanical supercharger 11 via another tubular pin 25. Further, O-rings 26 and 27 are provided on the outer circumferences of the tubular pins 24 and 25, respectively. The tubular pins 24 and 25 are the bracket 5 and the mechanical supercharger 11.
It constitutes an oil passage between and, and also serves as the positioning of both.

The oil enters the front side of the mechanical supercharger 11 from the main gallery 17 through the oil inlet passage 18 to lubricate the speed increasing gear and the front side bearing, and is guided to the rear side to lubricate the rear side bearing. Then, it returns to the blow-by chamber 4 of the engine block 1 through the respective oil outlet passages 19 and 20 on the front side and the rear side. The supercharger 11 is a so-called screw type mechanical supercharger, and a drive pulley 29 is connected to a speed increasing gear at a front end of the supercharger 11 via a clutch 28.

In the case of this embodiment, with respect to the mechanical supercharger 11 arranged in the V bank space of the V type engine, the brackets 5 for mounting the supercharger 11 on the engine block 1 are used to utilize the oil passages 18 to 20. By forming the, it is possible to connect the main gallery 17 located in the center of the engine block 1 with the shortest distance.

(Effect of the Invention) Since the present invention is configured as described above, the oil passage for lubrication of the mechanical supercharger arranged between the banks of the V-type engine is shortened, and it is compact and oil It is possible to obtain a lubricating structure with a small pressure loss.

[Brief description of drawings]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB, and FIG.
FIG. 1: engine block, 5: bracket, 11: mechanical supercharger, 13a, 13b, 14a, 14b: connecting part, 1
8: Oil inlet passage, 19 and 20: Oil outlet passage.

Continuation of the front page (56) Reference JP-A-57-49024 (JP, A) JP-A-62-63138 (JP, A) Actual public Sho-58-33225 (JP, Y2) Actual public Sho-53-11686 (JP , Y2)

Claims (1)

[Scope of utility model registration request] 1. A lubrication structure for a mechanical turbocharger arranged between banks of a V-type engine, wherein a blow-by chamber is formed in an upper portion between banks of an engine block, and a boss vertically penetrates the blow-by chamber. Is provided, the mechanical supercharger is fixed to a connecting portion formed on the upper surface of the blow-by chamber through a bracket, and extends from a main gallery provided below the blow-by chamber of the engine block and penetrates the boss portion. An oil inlet passage communicating with the lubrication portion of the mechanical supercharger via the connection portion and a bracket-side connection portion connected to the connection portion; and an oil inlet passage extending from the lubrication portion on the bracket side and the engine block side. A lubrication structure for a mechanical supercharger, comprising: an oil outlet passage communicating with the blow-by chamber via a connecting portion.