JPH0295731A - Supercharger - Google Patents

Abstract

PURPOSE:To miniaturize a supercharger as well as to improve its mountability by transmitting rotation of a shaft, where driving force is transmitted from the outside via a pulley, to a compressor impeller via a speed-up mechanism consisting of a planetary gear mechanism. CONSTITUTION:This supercharge is provided with a compressor casing 11 housing a compressor impeller 19 free of rotation, a pulley casing 12 supporting a pulley (an electromagnetic clutch 37) free of rotation, and a center casing 13 setting up a planetary gear mechanism (speed-up mechanism) connecting the compressor impeller to the pulley, inside, and in this supercharger, the compressor casing 11 and the pulley casing 12 are solidly joined together with the center casing 13 between. In addition, in this center casing 13, there is provided with a planetary gear mechanism which is made up of having a sun gear 24 in the center and an internal gear 40 on the circumference, and supporting pinion gears 23a, 23b, 23c set up in the point midway between these gears 24 and 40 with pinion carriers 20, 21 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a supercharger that can be used in automobile engines and the like.

(Prior art) Generally known automotive superchargers include a turbocharger that uses engine exhaust gas as a driving source, and a mechanical supercharger that is directly driven from an engine crank pulley or the like via a belt or the like. .

Since turbochargers use exhaust gas as their driving source, there is a delay known as turbo lag during transient situations such as sudden acceleration, and poor response is cited as a drawback. As for mechanical superchargers, positive displacement superchargers such as the Roots type are mainly used for automobiles. Since positive displacement superchargers do not have an internal compression function, they have poor total adiabatic efficiency, and also consume a large amount of horsepower during operation, which has the disadvantage of worsening fuel efficiency when used in automobiles. Furthermore, the positive displacement supercharger has the disadvantage that its theoretical discharge amount is small compared to its overall volume and that it is large.

Next, the conventional turbocharger proposed in Japanese Utility Model Application Publication No. 63-83493 will be explained with reference to FIG. 3. This turbocharger has a compressor impeller 50
A compressor housing 51 housing a turbine wheel 52 is connected to a turbine housing 53 housing a turbine wheel 52 through a center housing 54, and a compressor housing 51 housing a compressor housing 51 housing a turbine wheel 52 is connected to a turbine housing 53 housing a turbine wheel 52 through a center housing 54. They are connected by a shaft 55.

Next, the conventional Roots-type positive displacement supercharger proposed in Japanese Utility Model Publication No. 59-63390 will be explained with reference to FIG.
．． 57, and in order to rotate the two cocoon-shaped rotors at a constant speed and with high precision so that the rotors do not come into contact with each other, ordinary gears 58 and 59 are connected to the rotor shaft 60 and 61.
are fixed and interlocked with the ends of the

(Problems to be Solved by the Invention) The turbocharger shown in FIG. 3 has a problem called turbo lag, in which the rise in supercharging pressure during acceleration is delayed and a time lag occurs in the rise of torque.

In addition, in the positive displacement supercharger shown in Figure 4, a belt etc. is connected to the output shaft of the engine. Rotation is transmitted via J62,
Furthermore, since the supercharger is driven via the rotor shafts 60, 61 and gears 58, 59, there are drawbacks such as large mechanical losses, poor overall efficiency, and large power consumption. In addition, positive displacement superchargers have a limit on air flow rate, so as the engine becomes larger, the supercharger also becomes larger, making it difficult to mount them.

The present invention was proposed in order to solve the above-mentioned conventional problems, and aims to provide a supercharger that is equipped with a radial compressor and a speed increasing mechanism and does not cause any problems in mounting even in the case of a supercharger. It is something to do.

[Structure of the invention]

(Means for Solving the Problems) Therefore, the present invention provides a shaft rotatably supported by a pulley casing and to which driving force is transmitted from the outside via the pulley, a shaft fixed to the shaft and connected to the pulley casing. A planetary gear mechanism includes an internal gear disposed in a center casing, a pinion gear that meshes with the internal gear, and a sun gear that meshes with the pinion gear, the sun gear being fixed to one end, and the planetary gear mechanism being fixed to the center casing. The compressor impeller consists of a shaft rotatably supported by a compressor casing, and a compressor impeller fixed to the shaft and disposed within the compressor casing.

(Operation) The driving force transmitted from the outside via the pulley is transmitted to the shaft supported by the pulley casing.
The shaft rotates, and the rotation of the shaft is transmitted to the sun gear via the internal gear and pinion gear of the planetary gear mechanism, and the rotation of the sun gear is further transmitted to the shaft supported by the compressor casing, thereby causing the compressor impeller to rotate. , compresses air and sends it out.

(Embodiment) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 to 2 show embodiments of the present invention, and in FIG.
is a compressor casing that rotatably accommodates a compressor impeller 19, and 12 is a pulley (electromagnetic clutch 3).
7) is rotatably supported, and 13 is a center casing in which a planetary gear mechanism (speed increasing mechanism) that connects the compressor compressor casing 11 and the pulley casing 12 is arranged. and are integrally joined with the center casing 13 in between. That is, the compressor casing 11 is connected to the center casing 13 by bolts 15 and a mounting plate 14, and has a scroll passage 16 formed therein, and the axial passage 17 is connected to the scroll passage 16.
A compressor impeller 19 attached to a shaft 18 is rotatably housed in a communicating portion of these passages 16, 17.

Furthermore, as shown in FIG. 2, three pinion carriers 20, 21.22 are formed inside the center casing 13, and a sun gear 24 is connected to these carriers 20, 21.22 via pinion gears 23a, 23b, 23c, respectively. is rotatably supported. Further, the shaft 18 rotatably passes through an angular bearing 25, a bush 26, and a mechanical seal 27, and is coupled to a compressor impeller 19. Note that 28 is an O-ring, and the mechanical seal 27 is fixed to the center casing 13 with a snap ring 29. Further, the center casing 13 has a hole for supplying lubricating oil, and the hole is tightened with a copper ring 31 and a bolt 32.

Further, the pulley casing is connected to the center casing 13 with a bolt 33, and a nut 3 is connected to the shaft 35.
6, an electromagnetic clutch 37 fixedly connected to the axial passage 34
It is rotatably arranged on the shaft of a pulley casing 12 that forms a pulley casing 12. Further, a shaft 35 is rotatably supported by the pulley casing 12 via a shaft seal 38 and a bearing 39. An internal gear 40 is fixed to the shaft 35 at the right end in the figure with a nut 41.

Furthermore, the center casing 13 has a sun gear 24 in the center.
, there is an internal gear 40 on the outer periphery, and the sun gear 24
A pinion gear 23 (
23a, 23b, 23c), and the pinion gear 23
The planetary gear mechanism is composed of pinion carriers 20, 21, and 22 that support pinion carriers 20, 23b, and 23c at equal intervals. Furthermore, lubricating oil is sealed in the center casing 13 as a lubricating means for each gear. Further, as an oil seal mechanism, the oil seal mechanism of the electromagnetic clutch 37 includes a passage 42 disposed around the outer periphery of the bearing 39 for supplying lubricating oil, and a passage 43 discharging lubricating oil.

On the other hand, the oil seal mechanism on the compressor rotor side includes a mechanical seal 27, a passage 44 for supplying lubricating oil, and an oil drain passage 45 for discharging lubricating oil.

Next, the effect will be explained. When the electromagnetic clutch is engaged with driving force being transmitted from the outside to the pulley of the electromagnetic clutch 37, the driving force from the outside is transmitted to the shaft 35, and the shaft 35 rotates.

The rotation of the shaft 35 is transmitted to the internal gear 40, and then to the sun gear 24 via the pinion gear 23 (23a, 23b, 23c), causing the shaft 18 to rotate.

When the shaft 18 rotates, the compressor impeller 19
rotates, compressing air and sending it out.

〔Effect of the invention〕

The present invention is configured as described in detail above, and since the planetary gear mechanism serves as a speed increasing mechanism, it is possible to increase the discharge amount without increasing the size.Moreover, since it is not large, it can be used as a supercharger for automobiles. However, there are no problems with mountability.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a supercharger showing an embodiment of the present invention;
The figure is a front view of the planetary gear mechanism in Figure 1, and
FIG. 4 is a side sectional view of a conventionally proposed supercharger and positive displacement supercharger, respectively. Explanation of main parts in the figure 11 - Compressor casing 12 - Pulley casing 13 - Center casing 18 - Shaft 19 - Compressor impellers 20, 21, 22 - Carriers 23, 23a, 23b, 23cm - Pinion gear 24 - Sun gear 35 -・Shaft 37 - Electromagnetic clutch (Boo January 40 - - Internal gear Fig. 2

Claims (1)

[Claims] a shaft rotatably supported by a pulley casing and to which driving force is transmitted from the outside via the pulley; an internal gear fixed to the shaft and disposed within a center casing connected to the pulley casing; A planetary gear mechanism comprising a pinion gear that meshes with an internal gear and a sun gear that meshes with the pinion gear, a shaft that has the sun gear fixed to one end and is rotatably supported by a compressor casing that is fixed to the center casing, and the shaft. A supercharger comprising a compressor impeller fixed to the compressor impeller and disposed within the compressor casing.