JPH0730334U - Mechanical supercharger - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a mechanical supercharger with good backlash of the sun gear and pinion gear of the speed increasing mechanism, which does not exert excessive force on the impeller shaft, and which is easy to assemble. A mechanical supercharger 1 according to the present invention comprises an air compressor 7 having an impeller shaft 25 supported by a bearing holder 51, and a sun gear 27 integrated with the impeller shaft.
A plurality of pinion gears 23 supported on the housing 17 side, and an internal gear 21 driven by the engine.
And a spherical support portion 57 that is provided between the bearing holder and the housing side and that swingably supports the impeller shaft.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanical supercharger that pressurizes engine intake air.

[0002]

[Prior art]

 Japanese Unexamined Patent Publication No. 2-95731 discloses a supercharger 201 as shown in FIG. This is configured to accelerate the driving force of the engine through the planetary gear mechanism 203 and drive the air compressor 205, and the driving force of the engine is input from the internal gear 207 of the planetary gear mechanism 203. It is transmitted to the sun gear 211 through the three pinion gears 209 and rotates the impeller shaft 213.

[0003]

[Problems to be solved by the device]

 If the position accuracy of the pinion gear 209 is poor, the backlash with the sun gear 211 becomes non-uniform, and a large force is applied to the sun gear 211 from the pinion gear with a narrow backlash, and an unreasonable force acts in the direction of bending the impeller shaft 213. Therefore, the gears are not properly meshed with each other, the gear noise is increased, the durability is reduced, and the bearing 215 of the impeller shaft 213 may be seized.

Further, FIG. 4 shows the bearing holder 219 holding the impeller shaft 217 press-fitted into the member 221 on the housing side, but this is difficult because the press-fitting margin is long and the assembling property is poor.

Therefore, the object of the present invention is to provide a mechanical supercharger with good assemblability in which the backlash of the sun gear of the speed increasing mechanism and the backlash of the pinion gear are evenly maintained so that no excessive force acts on the impeller shaft. To do.

[0006]

Means for Solving the Problems A mechanical supercharger of the present invention is a centrifugal air compressor in which an impeller shaft is supported by a bearing holder through bearings, a sun gear integrated with the impeller shaft, and a housing side. A planetary gear type speed increasing mechanism having a plurality of pinion gears supported on a supported pinion shaft and an internal gear for inputting the driving force of the engine, and an impeller side provided between the bearing holder and the housing side. And a spherical support portion that swingably supports the impeller shaft.

[0007]

[Action]

 The impeller shaft of the air compressor, which is supported by the bearing holder via the bearing, is swingably supported about the impeller side by a spherical support portion provided between the housing and the bearing holder. Therefore, if the backlash between the sun gear integrated with the impeller shaft and the plurality of pinion gears is uneven, the impeller shaft will oscillate to a position where the meshing reaction forces received by the sun gears from the pinion gears are equal to each other. Since there is a distance between the center of the swing provided on the impeller side and the sun gear with the bearing part of the impeller shaft in between, and the amount of movement of the sun gear is small, the movement of the sun gear due to the swing of the impeller shaft is substantially Can be regarded as parallel movement, and there is no adverse effect on meshing. In addition, since it swings around the impeller side, there is no adverse effect on the air compressor due to the swing.

In this way, since the backlash between the sun gear and the pinion gear is always kept uniform, the impeller shaft is not subjected to excessive force, the durability of the speed increasing mechanism and the air compressor is improved, and the rotating sound is quiet. . In addition to this, there is no need to perform ultra-precision machining on each part to make the backlash uniform, and the machining cost including yield is greatly reduced.

[0009]

【Example】

 One embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 shows a mechanical supercharger 1 and a pulley 3 of this embodiment. The left and right directions are the left and right directions in FIG. 1, and members and the like without reference numerals are not shown.

As shown in FIG. 1, the mechanical supercharger 1 includes a planetary gear type speed increasing mechanism 5 and a centrifugal type air compressor 7.

The pulley 3 is fixed to the input shaft 13 by a key 9 and a nut 11. The pulley 3 is connected to a pulley on the crankshaft side via a belt and is rotationally driven by the driving force of the engine. The input shaft 13 is supported by a housing 17 of a speed increasing mechanism 5 by a bearing 15, and a seal 19 is arranged between the input shaft 13 and the housing 17.

The speed increasing mechanism 5 includes an internal gear 21 formed integrally with the input shaft 13, two pinion gears 23 arranged at equal intervals in the circumferential direction as shown in FIG. 2, and an impeller of the air conditioner press 7. The sun gear 27 formed on the shaft 25. The pinion gear 23 is supported by a pinion shaft 31 via a bearing 29, and the pinion shaft 31 is supported by a flange member 33 of the housing 17. The speed increasing mechanism 5 speeds up the driving force of the engine input from the pulley 3 to the internal gear 21 to rotationally drive the impeller shaft 25.

An impeller 35 is fixed to a right end side of the impeller shaft 25 with a nut 37, and a compressor housing 39 of the air compressor 7 is connected to a circumferential groove 41 of the housing 17 by a connecting member 43 and a bolt 45. It is fixed to the housing 17 together with the flange member 33. In this way, the air compressor 7 is configured, and when the impeller 35 is rotationally driven, the air compressor 7 pressurizes the intake air and supplies it to the engine.

A labyrinth seal 47 is fixed to the flange member 33 with a screw 49, and a space 53 is formed between the labyrinth seal 47 and the bearing holder 51. The downstream side of the throttle valve in the intake passage of the engine and the space 53 communicate with each other through the air flow path 54 and the control valve. When the throttle valve is closed and a negative pressure is generated on the right side of the impeller 35, the control is performed. The space 53 is opened to the atmosphere by the valve and is always kept at a positive pressure.

A flange 55 is formed on the right end of the bearing holder 51, and a spherical support portion 57 is formed between the flange 55 and the flange member 33. A disc spring 59 is arranged between the labyrinth seal 47 and the collar 55, and the bearing holder 51 is pressed against the flange member 33 to be supported and positioned in the axial direction. A gap 61 is provided between the bearing holder 51 and the flange member 33, and two elastic seals 63 are arranged in the gap 61.

The bearing holder 51 and the impeller shaft 25 are swingably supported by the flange member 33 via the support portion 57, and the change of the gap 61 during the swing is absorbed by the flexure of each seal 63. . Further, the center of swinging is at a position on the impeller shaft 25 indicated by an arrow 65. The contact surface of the support portion 57 is provided with a slight gap at both ends by crowning so as to prevent galling at the end portion and smoothly swing. The disc spring 59 may be another elastic body. In addition, the structure in which the bearing holder 51 is supported by the support portion 57 and the gap 61 is provided between the flange members 33 greatly improves the assembling property as compared with the conventional example in which the bearing holder is press-fitted.

An overhang portion 67 is provided on the left end side of the bearing holder 51, and this overhang portion 67 penetrates into the recess 68 of the input shaft 13. Further, as shown in FIG. 2, the bearing holder 51 is provided with a notch 69 in order to avoid interference with the pinion gear 23.

The rings 71 and 73, the spacer 75, and the bush 77 are fitted to the impeller shaft 25 from the left between the sun gear 27 and the impeller 35, and rotate together with the impeller shaft 25. Further, a slide bearing 79 (bearing) is arranged on the left side of the sun gear 27, and a slide bearing 81 (bearing) is arranged on the outer periphery of the spacer 75 to support the impeller shaft 25 on the bearing holder 51.

A thrust washer 83 is attached to the bearing holder 51 from the outside in the radial direction, and is fixed by a bolt 85. The thrust washer 83 engages with the groove 87 between the rings 71 and 73 and receives a force in the thrust direction of the impeller shaft 25.

An oil passage 89 formed through the bearing holder 51, the seals 63 and 63, and the flange member 33, a nozzle 91, and an oil plug 93 are added to each slide bearing 79 and 81 from an oil pump. Pressure oil is supplied, and the impeller shaft 25 is supported in a floating state via an oil film to absorb the vibration. This oil is also supplied to the groove 87 to lubricate the sliding portion of the thrust washer 83.

A seal 95 and a piston ring 97 are arranged between the bearing holder 51 and the bush 77 to form a contact-type oil seal 99, which prevents oil leakage from the housing 17. As described above, even if a negative pressure is generated on the suction side of the impeller 35, the space 53 is always kept at a positive pressure, so that oil leakage from the oil seal 99 is effectively prevented.

Thus, the mechanical supercharger 1 is configured.

Since the impeller shaft 25 is swingably supported together with the bearing holder 51 by the supporting portion 57, when the mechanical supercharger 1 is assembled, the sun gear 27 has a meshing reaction force with each pinion gear 23. The sun gear 27 and the pinion gears 23 are moved to a uniform position, and the backlash of the sun gear 27 and each pinion gear 23 is always kept uniform. Further, for example, even if the pulley 3 receives excessive belt tension and is pushed by the internal gear 21 to move the pinion gear 23, the sun gear 27 also moves and the backlash is kept uniform.

With such a function of uniformly maintaining the backlash, the sun gear 27 and the pinion gear 23 are normally meshed with each other, so that the gear sound of the speed increasing mechanism 5 becomes quiet and the durability is improved. Further, since no unreasonable force is exerted on the impeller shaft 25, uneven wear and seizure of the slide bearings 79, 81 are prevented, so that the rotation noise of the air compressor 7 becomes quiet and durability is improved. In addition to this, super-precision machining of each part for eliminating the position error of the pinion gear 23 and making the backlash uniform is not necessary, and the machining cost including the yield is greatly reduced.

The amount of movement of the sun gear 27 is extremely small, and the distance from the sun gear 27 to the center of swing (arrow 65) is long compared to this amount of movement, so that the sun gear 27 associated with the swing is moved. The movement can be regarded as substantially parallel movement, and does not adversely affect the meshing with the pinion gear 23. Further, since the center of the swing is on the side of the impeller 35, and the amount of movement of the impeller 35 accompanying the swing is even smaller than that of the sun gear 27, it does not affect the characteristics of the air conditioner press 7.

[0026]

[Effect of device]

 In the mechanical supercharger of the present invention, the bearing holder that supports the impeller shaft integrated with the sun gear is swingably supported by the housing through the spherical support portion. The backlash with a plurality of pinion gears is always kept uniform, improving durability and quieting the rotating noise, and ultra-precision machining for uniform backlash is not required, resulting in a significant cost reduction. Also, since the bearing holder is not pressed in, it is easy to assemble.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

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

FIG. 4 is a sectional view of another conventional example.

[Explanation of symbols]

 1 Mechanical supercharger 5 Planetary gear type speed-up mechanism 7 Centrifugal air compressor 17 Housing 21 Internal gear 23 Pinion gear 25 Impeller shaft 27 Sun gear 31 Pinion shaft 35 Impeller 57 Spherical support 79,81 Slide bearing (bearing )

Claims (1)

[Scope of utility model registration request] 1. A centrifugal air compressor in which an impeller shaft is supported by a bearing holder via a bearing, a sun gear integrated with the impeller shaft, and a plurality of pinion gears supported on a pinion shaft supported on the housing side. , A planetary gear type speed increasing mechanism having an internal gear to which the driving force of the engine is input,
A mechanical supercharger comprising: a spherical support portion provided between a bearing holder and a housing side to swingably support an impeller shaft around the impeller side.