JPH07243329A - Mechanical supercharger - Google Patents

Abstract

(57) [Summary] [Purpose] Sufficient lubrication and cooling is performed without using engine oil even at high speed specifications. [Structure] The mechanical supercharger 1 according to the present invention includes a speed increasing gear set 7
And a screw type air compressor 17 which is rotationally driven by the engine via a timing gear set 9 and each gear set 7,
Casing 13 that houses 9 and has an oil reservoir inside
And an oil pump 11 configured to use at least one of the gear sets 7 and 9 to discharge the oil in the oil reservoir to the outside of the casing through the external oil passage 15 and then to flow into the inside of the casing to supply it to a lubricating point. , And an oil cooler provided in the external oil passage 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical supercharger for pressurizing engine intake air.

[0002]

2. Description of the Related Art FIG.
Such a mechanical supercharger 201 is described. This uses a screw type air compressor 203. This type of air compressor is more efficient in a high load region of the engine than, for example, a roots blower, but has a small discharge amount per volume, so a timing gear assembly is used. Two
The speed increasing gear set 207 is arranged in the preceding stage of 05 and is driven at high speed.

[0003]

SUMMARY OF THE INVENTION Each gear set 205, 20
A casing 209 for accommodating 7 is provided with an oil sump, and this oil is repelled by the rotation of each gear set 205, 207, and the bearings 211, 213, 215, the meshing portion of each gear set 205, 207, or the air compressor. It is supplied to lubrication points such as the seal portion of 203.

However, since the high-speed type has insufficient lubricating and cooling capacity by splashing oil, P19 of "Preliminary Collection 931 1993-5" of the Society of Automotive Engineers of Japan
As shown in 4, the engine oil is passed through the casing for forced lubrication, but due to the carbon sludge contained in the engine oil and the high temperature of the engine oil, the durability of sliding parts, meshing parts, seals, etc. is reduced. .

Therefore, an object of the present invention is to provide a mechanical supercharger which can sufficiently lubricate and cool each part without using engine oil even in a high speed specification.

[0006]

A mechanical supercharger of the present invention is a screw type air compressor which is rotationally driven by an engine through a speed increasing gear set and a timing gear set, a speed increasing gear set and a timing gear. And a casing having an oil sump inside, and at least one of these gear sets.The oil in the oil sump is discharged to the outside of the casing through the external oil passage and then allowed to flow into the casing. An oil pump for supplying to a lubrication point and an oil cooler provided in this external oil passage are provided.

[0007]

[Operation] At least one of the speed-up gear set and the timing gear set is used as an oil pump, the oil in the oil sump is once discharged to the outside, cooled by an oil cooler, and then allowed to flow into the casing to engage the bearing and gear. It is configured so that it is supplied to lubrication points such as seals and seals. Therefore, the carbon sludge of the engine oil and the high temperature are released, and each part can be sufficiently lubricated and cooled. Further, since the oil pump is configured by using the existing gear set, the implementation cost is low.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS.
It should be noted that members and the like to which reference numerals are not given are not shown.

As shown in FIG. 1, the mechanical supercharger 1 of the embodiment is shown.
Is a pulley 3, an input shaft 5, a speed increasing gear set 7, a timing gear set 9, an oil pump 11, a casing 13 of each gear set 7, 9, an external oil passage 15, and a screw type air compressor 1.
It is composed of 7 etc.

The air compressor 17 is provided with a pair of screw type rotors 19 and 21 (one of which is a convex type and the other of which is a concave type) and a compressor housing 23 which accommodates them. Each rotor shaft 25 and 27 has bearings 29 at both ends. It is supported by the casing 13 and the housing 23 via 29 and bearings 31, 31. A seal 3 is provided between each rotor shaft 25, 27 and the casing 13 and the housing 23.
3, 35 are arranged. The air compressor 17 includes rotors 19 and 21 that rotate the air sucked from the suction port 39.
The compressed intake air discharged from the discharge port 37 is supplied to the engine by pressure-feeding in the axial direction.

The pulley 3 is connected to a crankshaft side pulley of the engine via a belt and is rotationally driven by the engine. The pulley 3 is supported on the outer periphery of the casing 13 via a bearing 41, is spline-connected to the input shaft 5, and is prevented from coming off by a bolt 43 and a washer 45. The input shaft 5 is supported by the casing 13 via a bearing 47. Input shaft 5 and casing 1
A seal 49 is arranged between the two and the three.

The speed increasing gear set 7 is composed of a large gear 51 and a small gear 53, and the timing gear set 9 is composed of a pair of timing gears 55 and 57. The large gear 51 is formed integrally with the input shaft 5, and the small gear 53 and one timing gear 57 are connected to the rotor shaft 27 by a key 59, and are prevented from coming off by a nut 61. The other timing gear 55 is connected to the rotor shaft 25, and is prevented from coming off by a nut 63.

The engine driving force input from the pulley 3 is increased in speed by the speed increasing gear set 7 and transmitted to the air compressor 17 through the timing set 9. The timing gear set 9 rotationally drives the rotors 25 and 27 in opposite directions while meshing with each other with a predetermined gap.

The pump casing 6 surrounds the timing gear set 9 with the two side plates 65 and 67 and the casing 13.
9 is formed, and the pump casing 69 and the timing gear 9 constitute an oil pump 11. The casing 13 is provided with an oil sump, and the oil pump 11 sucks oil from this oil sump through the suction pipe 71 and discharges it from the discharge side oil plug 73 to the outside of the casing 13 through the external oil passage 15. To do. The discharged oil is cooled by an oil cooler provided on the external oil passage 15 and then sprayed into the casing 13 via the inflow oil plug 75.

Thus, the mechanical supercharger 1 is constructed.

Unlike the conventional example, the mechanical supercharger 1 does not use engine oil for lubrication, and therefore lubrication of the oil sludge is prevented without deterioration of sliding parts, meshing parts and seals due to high temperature. Can sufficiently cool and cool the parts. Since the oil pump 11 is configured by using the timing gear set 9,
The implementation cost of the present invention is low.

The oil pump may be constructed using a speed increasing gear set.

[0018]

In the mechanical supercharger of the present invention, at least one of the speed increasing gear set and the timing gear set for transmitting the driving force of the engine to the screw type air compressor is used as an oil pump, and the oil in the casing is discharged to the outside. The engine oil is not used for lubrication. Therefore, these lubricating parts can be sufficiently lubricated and cooled without deteriorating the sliding part, the meshing part, the sealing part and the like.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line A-B-A in FIG. 2 showing an embodiment.

FIG. 2 is a cross-sectional view of the air compressor portion of the embodiment of FIG.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Mechanical supercharger 7 Speed-up gear set 9 Timing gear set 11 Oil pump 13 Casing 15 External oil passage 17 Screw type air compressor

Claims (1)

[Claims] 1. A screw type air compressor rotatably driven by an engine via a speed increasing gear set and a timing gear set, and a casing which houses the speed increasing gear set and the timing gear set and has an oil reservoir inside thereof. An oil pump that is configured using at least one of these gear sets, discharges the oil in the oil sump to the outside of the casing through the external oil passage, and then supplies the oil to the inside of the casing to supply it to a lubricating point,
A mechanical supercharger comprising: an oil cooler provided in the external oil passage.