JP2594334Y2 - Machine driven supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mechanically driven supercharger used to improve the output performance of an engine.

2. Description of the Related Art As shown in FIG. 3, a mechanical drive type supercharger (supercharger) for generating a supercharging pressure to an engine has a male rotor 2 and a female rotor 3 in a rotor casing 1 as shown in FIG. The shafts 6 and 7 of the rotors 2 and 3 are arranged in parallel and engaged with the front bearings 4a and 5a and the rear bearings 4b and 4b, respectively.
5b, the shaft 6 of the male rotor 2 and one end of the shaft 7 of the female rotor 3 project through the rotor casing 1 into a gear casing 8 provided on one side of the rotor casing 1. Position, the timing gears 9, 10 meshing with each other are attached to the protruding portions of the shafts 6, 7,
The gear casing 8 has a speed increasing gear meshing with each other.
11 and 12, the small-diameter gear 11 is mounted on the shaft 6 of the male rotor 2, while the large-diameter gear 12 is supported by bearings 13a and 13b and one end thereof penetrates the gear casing 8. The input shaft 14 is attached to the other end of the input shaft 14 so as to protrude toward the non-rotor side. A pulley 16 is rotatably mounted on an outer periphery of an end of the input shaft 14 protruding from the gear casing 8 via a bearing 17. A belt 18 is provided between the pulley 16 and a pulley mounted on an output shaft of the engine. Between the pulley 16 and the input shaft 14 so that the output of the engine is transmitted to the pulley 16 via the belt 18, and the rotation of the pulley 16 is further transmitted to the rotors 2 and 3. An electromagnetic clutch 19 is provided. When the rotational power of the engine is transmitted to the pulley 16 via the belt 18 with the electromagnetic clutch 19 engaged,
The rotation of the pulley 16 is transmitted to the input shaft 14 through the electromagnetic clutch 19, and further transmitted to the timing gears 9 and 10 after the speed is increased through the speed increasing gears 12 and 11. And the male rotor 2 and the female rotor 3 rotate in the rotor casing 1, so that the air sucked from the suction port 20 provided in the rotor casing 1 is compressed and the discharge port provided in the rotor casing 1 is compressed. Discharged from 21 and supercharged to the engine.

In the mechanically driven supercharger, since the rotors 2 and 3 rotate at high speed, the bearings 13a and
13b and bearings 4a at the front part supporting the shafts 6 and 7 of the rotors 2 and 3
It is necessary to prevent wear of the bearings 5a, 5b, 5b, etc. of the rear part. Therefore, conventionally, lubricating oil is sealed in the front part and the rear part of the rotor casing 1 in order to apply lubricating oil to these bearings. The internal sealing method described above is adopted, and an oil film is formed on the sliding surface of each bearing or the like by the sealed lubricating oil.

However, when the rotor rotates at high speed and the amount of heat generated does not increase, or when the temperature of the casings 1 and 8 rises due to the rise in the temperature of the discharge air, the temperature of the lubricating oil increases due to this heat generation. In the case of a lubrication system with a built-in system, there is a risk that an oil film will not be formed on the sliding surface, and it is increasingly difficult to forcibly cool the lubricating oil once the temperature rises. However, there is a problem that the sliding surface such as a metal comes into contact with each other and is easily worn.

Therefore, after lubricating oil is supplied from the outside into the rotor casing 1 and the gear casing 8 and passed through the respective lubrication points of the front part, the rear part, and the input shaft part, the rotor casing 1
A so-called external refueling system that discharges to the outside has been proposed.

In the external lubrication system, lubricating oil supplied from the outside into the rotor casing 1 is supplied to the bearings 13a,
13b and the gears 9, 10, 11, 12 and the bearings 4a, 5a at the front part and the bearings 4h, 5b at the rear part in the rotor casing 1. Although it is necessary to provide a lubricating oil flow path, the external lubrication method proposed so far is, as shown in FIG.
One or two of the four bolt holes 22 connecting the rotor casing 1 and the gear casing 8
In most cases, a lubricating oil flow path 15 is formed near the lubricating oil passage, and the lubricating oil flow path 15 formed in this portion is also supplied to the rear bearings 4b and 5b.

[Problem to be Solved by the Invention] However, in the system in which the lubricating oil flow path 15 is provided near the coupling bolt hole 22 as shown in FIG.
The actual condition is that the thickness of the outer wall is increased in order to provide the lubricating oil flow path 15 on the outer wall of the rotor casing. When doing so, there is a risk that the arrangement relationship with other components may be disturbed, and processing of the rotor casing 1 is complicated and troublesome.

Thus, the present invention is intended to supply lubricating oil to a lubrication point by an external lubrication method without increasing the outer diameter of the rotor casing.

Means for Solving the Problems In order to solve the above problems, the present invention provides a lubricating oil flow passage in a rotor casing in which a male rotor and a female rotor are engaged and each is rotatably housed along the inner surface of a wall. In a mechanically driven supercharger having a configuration in which lubricating oil supplied from the outside is passed through a lubrication point in a front part and a rear part, a lubrication point in a gear casing, and then discharged outside, a rotor casing is provided. The rear part of the front casing is divided into a rear casing, and lubricating oil is introduced to the bearing at the front part of the rotor casing and the bearing at the rear part of the rear casing. One lubricating oil passage connecting the bearing of the rotor casing with the rotor engagement portion of the radially inwardly protruding portion facing the rotor engagement portion of the wall of the rotor casing. At a position along the axial direction.

The lubricating oil is supplied from the middle of the lubricating oil flow path, and the lubricating oil is drained from a position corresponding to the bearing at the front part and the bearing at the rear part in the rear casing.

[Operation] A single lubricating oil flow path connecting the front bearing and the rear bearing to guide the lubricating oil to both the front and rear bearings is radially inwardly facing the rotor meshing portion of the rotor casing. The outer diameter of the rotor casing is not increased by piercing the lubricating oil passage along the axial direction at the protruding position of the lubricating oil flow path. Can be easily performed. Further, since oil is supplied to the bearing, even when the bearing generates heat due to high-speed rotation of the rotor, the temperature of the bearing can be reduced by supplying the cooled lubricating oil. Also, if lubrication is performed from the middle of the lubricating oil flow path and drainage is performed from the positions corresponding to the front and rear bearings, the flow of the lubricating oil can be performed smoothly, and Lubricity can be effectively performed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 show one embodiment of the present invention.
Similarly to the mechanically driven supercharger shown in FIG. 3, the shafts 6 and 7 of the male rotor 2 and the female rotor 3 meshed and arranged in parallel in the rotor casing 1 are connected to bearings 4a at the front part of the rotor casing 1. , 5a and the rear bearings 4b, 5b, respectively, and the input shaft 14 pushed into the gear casing 8 is rotatably supported by the bearings 13a, 13b. The rear portion of the rotor casing 1 supporting the bearings 4b and 5b is divided into rear casings.
As 1a, the rotor casing 1, the rear casing 1a, and the gear casing 8 are divided into three parts. On the bottom surface of the rotor casing 1, an oil supply port 26 and a first oil discharge port 24 are provided at appropriate positions on the front side. A second oil discharge port 25 is provided at an appropriate position of the casing 1a, and lubricating oil supplied from the oil supply port 26 is passed through a lubricating oil flow path 23 provided at a position between the rotors 2 and 3 of the rotor casing 1. After being led to the bearings 4a, 5a, which are the lubrication points of the front part, and the bearings 4b, 5b, which are the lubrication points of the rear casing 1a, the first oil discharge port 24 and the second oil discharge port 25 are formed.
After being guided from the first oil discharge port 24 to the bearings 13a and 13b, which are the oil supply points of the input shaft portion in the gear casing 8, through the distribution passage 27 distributed at the front portion. Use an external refueling system that can be discharged.

The lubricating oil flow path 23 is provided between the front part and the rear casing 1a.
A radially inwardly protruding portion of the wall of the rotor casing 1 facing the meshing portion of the rotors 2 and 3 is formed along the axial direction at a position close to the meshing portion.

In the present invention, as described above, the lubricating oil supplied from the oil supply port 26 is supplied to the bearings 4a and 5a, which are the lubrication points on the front part.
And the bearings 4b and 5b, which are oiling points in the rear casing 1a, and the bearings 13a, which are oiling points in the input shaft portion in the gear casing 8.
13b, the oil is discharged from the first oil discharge port 24 and the second oil discharge port 25.
When the bearing or the like generates heat due to high-speed rotation of the lubricating oil, after cooling the lubricating oil with an oil cooler, the temperature can be lowered by supplying the cooled lubricating oil, and the oil film formed on the sliding surface of the bearing is reduced. Although it is possible to stably hold and prevent wear due to contact between metals, in this case, lubricating oil supplied from the oil supply port 26 is supplied to the bearings 4a, 5a, which are the oil supply points of the front part, and the rear casing 1a. Lubricating oil flow path 23 for leading to bearings 4b, 5b
Since it is provided on the wall of the rotor casing 1 at the position facing the meshing portion of the rotors 2 and 3, it is not necessary to increase the thickness of the outer wall of the rotor casing 1 and it is not necessary to increase the outer diameter. This makes it possible to save space. Since the rotor casing 1 has a rear portion divided into a rear casing, the lubricating oil flow path 23 can be easily machined.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, the lubricating oil flow path is provided in the rotor casing in which the male rotor and the female rotor of the mechanically driven supercharger of the present invention are engaged with each other and rotatably housed along the inner surface of the wall. In a mechanically driven supercharger having a configuration in which lubricating oil supplied from the outside is passed through a lubrication point in a front part and a rear part, a lubrication point in a gear casing, and then discharged to the outside, a rear part of a rotor casing is provided. The bearing is divided into a rear casing and the lubricating oil is guided to a bearing which is a lubricating point at a front part of the rotor casing and a bearing which is a lubricating point at a rear part in the rear casing. One lubricating oil flow path connecting the bearing and the shaft is positioned at a position close to the rotor meshing portion of a radially inwardly protruding portion facing the rotor meshing portion on the wall of the rotor casing. Since it is configured to be bored along the direction, it is not necessary to increase the thickness of the outer wall portion of the rotor casing to provide the lubricating oil flow path, so that the outer diameter dimension does not increase, When mounted on a vehicle, there is no danger of disturbing the positional relationship with other parts, and lubricating oil flows to the thick portion of the radially inwardly protruding portion facing the rotor meshing portion on the wall of the rotor casing. Since the passage is formed, the processing of the lubricating oil flow path can be easily performed. Further, since the rear portion of the rotor casing is divided into a rear casing, the thick portion of the rotor casing can be axially moved. One lubricating oil flow path extending from the inside of the wall of the rear casing to the bearing of the rear part extends from the wall of the rear casing to the mating surface with the rear casing of the rotor casing and the rotor casing of the rear casing. And can be done from the mating surface of, it is possible to perform processing of 該潤 Namerayu channel more easily, further, performs the supply of the lubricating oil from the middle of the lubricating oil passage,
And by performing the drainage of the lubricating oil from the position corresponding to the bearing of the front part and the bearing of the rear part, when the bearing generates heat due to high-speed rotation of the male rotor and the female rotor,
Lubricating oil can be cooled and supplied, the temperature of the bearing can be lowered, and with this, the oil film formed on the sliding surface of the bearing can be stably held, and wear can be prevented. In addition, the lubricating oil can flow smoothly, and the lubricating effect by the lubricating oil can be improved, and the like, and the like, is exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of the mechanically driven supercharger of the present invention, FIG. 2 is a view taken along the line II-II of FIG. 1, and FIG. 3 is a conventional mechanically driven supercharger. FIG. 4 is a schematic diagram showing an external lubrication system in which a lubricating oil flow path is provided in an outer wall portion which has been proposed so far. DESCRIPTION OF SYMBOLS 1 ... Rotor casing, 1a ... Rear casing, 2 ... Male rotor, 3 ... Female rotor, 4a, 4b, 5a, 5b, 13a, 13b ... Bearing (lubricating point), 6, 7 ... Shaft, 23 ... Lubricating oil flow path , 24... First oil drain, 25... Second oil drain, 26.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Go Goto 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Koichi Hatamura 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) References JP-A-50-70912 (JP, A) JP-A-63-108584 (JP, U) JP-A-62-40151 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] A lubricating oil passage is provided in a rotor casing in which a male rotor and a female rotor are engaged with each other so as to be rotatable along the inner surface of a wall portion, and lubricating oil supplied from outside is supplied to a front portion and a rear portion. In a mechanically driven supercharger having a configuration in which a fueling point and a fueling point in a gear casing are passed through and then discharged to the outside, a rear part of a rotor casing is divided as a rear casing, and a front part of the rotor casing is separated. One lubricating oil passage connecting the front bearing and the rear bearing in order to guide the lubricating oil to the bearing which is the lubricating point of the rear part and the bearing which is the lubricating point of the rear part in the rear casing, A radially inwardly protruding portion of the wall of the rotor casing facing the rotor meshing portion is bored in a position close to the rotor meshing portion along the axial direction. A lubricating oil supply port is connected in the middle of the flow path so that lubricating oil is supplied from the middle of the lubricating oil flow path, and the lubricating oil discharge port is located on the front side of the rotor casing and the rear casing. A mechanically driven supercharger, wherein drainage of lubricating oil is performed from a position corresponding to a bearing at a front portion and a bearing at a rear portion in a rear casing.