JPH07145737A - Mechanical supercharger - Google Patents

Abstract

PURPOSE:To improve engagement of gear in a speed increasing mechanism, and form the diameter of a casing in a small size. CONSTITUTION:A mechanical supercharger 1 is provided with a planetary gear type speed increasing mechanism 5 in which both ends of a position shaft 33 are supported by pinion carriers 35, 37, a centrifugal air compressor 7 whose impeller shaft 27 is driven in its rotation through a sun gear 29, and an internal gear is supported at its outer circumference by the pinion carriers 35, 37 through a bearing 43, and the impeller shaft 27 is supported at its inner circumference by the same carriers through bearings 95, 97 which are arranged on both sides in axial direction of the sun gear 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical supercharger that pressurizes intake air and supplies it to an engine.

[0002]

2. Description of the Related Art A mechanical supercharger is described in DE 3829697A1. This is configured so that the drive force of the engine is increased by a planetary gear type speed increasing mechanism to drive the centrifugal air compressor.
The sun gear of the speed increasing mechanism is formed on the impeller shaft of the air compressor, and the sun gear side of the impeller shaft is cantilevered by two bearings. Therefore, the bending stress acting on the impeller shaft exerts an unreasonable force on the bearing, which causes a problem in durability.

Therefore, the present applicant has filed Japanese Patent Application No. 4-7085.
5, a mechanical supercharger 201 as shown in FIG. 3 was proposed.
This is because the impeller shaft 209 of the centrifugal air compressor 207 in which the sun gear 205 of the planetary gear type speed increasing mechanism 203 is formed is supported on both sides by bearings 211 and 213, and the problem due to the above cantilever support is solved. did.

[0004]

This mechanical supercharger 20
In No. 1, the internal gear 215 of the speed increasing mechanism 203 is formed integrally with the input shaft 217, and the input shaft 217 is supported by the casing 221 via the bearing 219. Therefore, the internal gear 215 and the pinion gear 2
The distance between the meshing portion with 23 and the bearing 219, which is the support point of the internal gear 215, is large. In order to improve the support of the internal gear 215 and the meshing state with the pinion gear 223, this distance should be made as small as possible.

Further, the bearing holder 225 needs a convex portion 227 in order to dispose the bearings 211 and 213 on both sides of the sun gear 205. The convex portion 227 and the main body 2 are required.
Since it is necessary to connect 29 to the pinion gear 223 and the sun gear 205 with a gap, the shape is complicated and processing is difficult. Further, the bearing holder 225 is attached to the casing 22.
It is supported by the flange portion 231 on the first side, and this flange portion 231 is the pinion shaft 2 of the pinion gear 223.
It supports 33 and functions as a pinion carrier. Therefore, the flange portion 231 has a large diameter, and the space 23
Even if the thickness of 5 is removed, the casing 221 in this portion cannot be made too small in diameter. Further, since the pinion shaft 233 is supported in a cantilever manner, it is necessary to provide a drop-out preventing means composed of the ball 237 and the screw 239, and the structure is complicated.

Therefore, an object of the present invention is to provide a mechanical supercharger which improves the meshing of gears of a speed increasing mechanism and has a simple structure and a small casing.

[0007]

A mechanical supercharger of the present invention has an internal gear and a sun gear meshed with a pinion gear, and a pinion carrier supporting both ends of a pinion shaft supporting the pinion gear. It is equipped with a planetary gear type speed-up mechanism that speeds up the driving force of the engine input from the gear and outputs it from the sun gear, and a centrifugal air compressor that drives the impeller shaft to rotate via the sun gear and pressurizes the engine intake air, The pinion carrier supports the internal gear on the outer circumference via bearings, and supports the impeller shaft on the inner circumference via bearings arranged on both axial sides of the sun gear.

[0008]

[Function] The pinion carrier supporting both ends of the pinion shaft of the planetary gear type speed increasing mechanism supports the internal gear on the outer circumference through bearings, and the impeller shaft on the inner circumference through bearings arranged on both sides of the sun gear. Configured to support. Therefore, the distance between the bearing that supports the internal gear and the meshing portion between the internal gear and the pinion gear is smaller than that in the conventional example of FIG. 3, so that the internal gear is reliably supported and the meshing state with the pinion gear is maintained. improves. Further, since the pinion carrier also serves as the bearing holder 225 and the flange portion 231 of the conventional example shown in FIG. 3, these two members become one member of the pinion carrier, which simplifies the structure and reduces the diameter, and the casing at this point. Can be made smaller.
Further, the pinion carrier is originally arranged on both sides of the pinion gear and has mutual connecting portions, so that there is no difficulty in processing unlike the bearing holder 225.

[0009]

EXAMPLE A first example will be described with reference to FIG. The left and right directions are the left and right directions in FIG. 1, and members and the like not denoted by reference numerals in the following description are not shown.

FIG. 1 shows a mechanical supercharger 1 and a pulley 3 of this embodiment. The mechanical supercharger 1 comprises a planetary gear type speed increasing mechanism 5 and a centrifugal air compressor 7. There is.

The pulley 3 is fixed to the input shaft 13 by a key 9 and a nut 11, and is supported by a bearing 15 on the outer periphery of a casing 17 of the speed increasing mechanism 5. 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. Input shaft 1
3 is supported on the inner circumference of the casing 17 by a bearing 19, and a seal 2 is provided between the input shaft 13 and the casing 17.
1 is arranged.

The speed increasing mechanism 5 includes an internal gear 23 formed integrally with the input shaft 13, a plurality of pinion gears 25 arranged at equal intervals in the circumferential direction, and a sun gear formed on the impeller shaft 27 of the air compressor 7. 29 and 29. The pinion gear 25 is supported by a pinion shaft 33 via a bearing 31.
Are supported at both ends by the left and right pinion carriers 35, 37. These pinion carriers 35 and 37 are integrated via a connecting portion 39. Internal gear 2
Reference numeral 3 denotes a connecting portion 41 with the input shaft 13, which is supported on the outer circumference of the left pinion carrier 35 via a bearing 43.

The speed increasing mechanism 5 speeds up the driving force of the engine input from the pulley 3 to the internal gear 23 to rotationally drive the impeller shaft 27.

The casing 17 is provided with a main body 45 and an intermediate casing 47, and the intermediate casing 47 is composed of left and right flange portions 49, 51 and a small-diameter boss portion 53 connecting them. The left flange portion 49 is fixed to the main body 45 with a bolt 55.

An impeller 57 is fixed to a right end portion of the impeller shaft 27 with a nut 59, and a compressor housing 61 of the air compressor 7 is fixed to a right flange portion 51 of an intermediate casing 47 via a bolt 63 and a connecting member 65. Has been done. In this way, the air compressor 7
When the impeller shaft 27 is rotationally driven, the air compressor 7 pressurizes intake air and supplies it to the engine.

The right pinion carrier 37 is press fitted into the inner periphery of the boss portion 53 of the intermediate casing 47. Further, a labyrinth seal 67 is fixed to the right flange portion 51 with a screw, and forms a space 69 with the pinion carrier 37. In the intake air intake passage of the engine, the downstream side of the throttle valve and the space 69 communicate with each other through the air flow passage 71 formed in the flange portion 51 and the control valve, and the throttle valve is closed to the right of the impeller 57. When a negative pressure is generated, the control valve creates a space 69.
Is open to the atmosphere and is always kept at positive pressure.

A sun gear 29 is attached to the impeller shaft 27.
A spacer 73 is fitted on the left side of the sun gear 29 and fixed by a retaining ring 75, and a spacer 77 and a bush 7 are attached on the right side of the sun gear 29.
9 are fitted and fixed in the axial direction by the sun gear 29 and the impeller 57. Further, a thrust washer 83 is arranged between the flange portion 81 of the spacer 77 and the pinion carrier 37, and receives a thrust force in the left direction generated on the impeller shaft 27.

Bushings 85 and 87 are arranged between the spacers 73 and 77 and the pinion carrier 37.
The bushes 85 and 87 have oil plugs 89 attached to the flange 49 and the pinion carriers 3 respectively.
The pressurized oil from the oil pump is supplied through the oil passages 91 and 93 formed in the floating bush 9 and the outer peripheral surface and the inner peripheral surface of the floating bush 9.
5, 97 (bearing). The floating bushes 95 and 97 support the impeller shaft 27 in a floating state on both sides of the sun gear 29 and absorb vibrations. This oil passes through an oil reservoir 99 formed between the pinion carrier 37 and the boss portion 53 and oil passages 101 and 103 formed in the pinion carrier 37, and the pinion gear 25
It is also supplied from the bearing 31 to the meshing portion of each gear and the bearing 43.

Pinion carrier 37 and intermediate casing 4
Oil seals 105 and 107 are arranged between the oil seals 7 and 7. Further, a seal 109 and a piston ring 111 are arranged between the pinion carrier 37 and the bush 79 to form a contact type oil seal 113, and the casing 1
Oil leakage from 7 to the air compressor 7 side is prevented. As described above, since the space 69 is kept at the positive pressure, the oil leak from the oil seal 113 is effectively prevented.

Thus, the mechanical supercharger 1 is constructed.

Since the internal gear 23 of the speed increasing mechanism 5 is supported by the pinion carrier 35 via the bearing 43, the distance between the meshing portion with the pinion gear 25 and this supporting point is different from that of the conventional example shown in FIG. small. Therefore, the support is ensured, the meshing state with the pinion gear 25 is improved, the gear noise is reduced, and the durability is improved. Further, the floating bush 9 is provided by the pinion carriers 35 and 37.
Since the impeller shaft 27 is supported via 5, 97, the bearing holder 225 of the conventional example of FIG. 3 is not necessary, and the structure is simpler and the boss portion 53 of the intermediate casing 47 is smaller in diameter and lighter in weight. . Further, since the both ends of the pinion shaft 33 are supported, there is no need for a drop-out preventing means such as the pinion shaft 233 of the conventional example shown in FIG. 3, and the structure is simple.

Next, an embodiment will be described with reference to FIG. In FIG. 2 and the following description, members having the same functions as those of the first embodiment are designated by the same reference numerals. Further, the left and right directions are the left and right directions in FIG. 2, and members and the like without reference numerals are not shown.

FIG. 2 shows the mechanical supercharger 115 and the pulley 3 of this embodiment. The mechanical supercharger 115 is equipped with a planetary gear type speed increasing mechanism 117 and an air compressor 7.

The internal gear 23 is supported on the outer periphery of the left pinion carrier 35 by a bearing 43 at a connecting portion 41 with the input shaft 13. The input shaft 13 includes the bearing 43, the internal gear 23 and the pinion gear 2
It is supported at two points of the meshing part with 5.

Further, on the impeller shaft 27, on the right side of the sun gear 29, the rings 119 and 121 and the spacer 12 are provided.
3, the bush 79 is fitted, is fixed in the axial direction between the sun gear 29 and the impeller 57, and the right floating bush 97 is the spacer 123 and the right pinion carrier 37.
It is located between and.

A thrust washer 127 is attached to the groove 125 formed between the rings 119 and 121, and is fixed to the pinion carrier 37 with a bolt 129. The thrust washer 127 positions the impeller shaft 27 in the axial direction.

In this way, the mechanical supercharger 115 is constructed.

Since the speed increasing mechanism 117 supports the internal gear 23 on the pinion carrier 35 near the meshing point with the pinion gear 25, the support is ensured, the meshing state with the pinion gear 25 is improved, and the gear noise is generated. Quiet and improved durability. Further, since the pinion carriers 35 and 37 are used as the holder members of the floating bushes 95 and 97, the bearing holder 225 of the conventional example shown in FIG. 3 becomes unnecessary, the structure is simplified, and the intermediate casing 4
The boss portion 53 of No. 7 has a smaller diameter and is lighter. Further, the pinion shaft 33 has a simple structure.

As described above, the input shaft 13 and the internal gear 23 mesh with the pinion gear 25 and the bearing 4.
There is no alignment error between the support points due to the three-point support. Therefore, the cost of alignment adjustment is not necessary, and the supporting points are advantageous because durability is not applied.

[0030]

According to the mechanical supercharger of the present invention, the internal gear of the planetary gear type speed increasing mechanism is supported on the outer periphery of the pinion carrier, and the impeller shaft is supported on the inner periphery of the pinion carrier. Because I configured
The structure is simplified, the internal gear is supported securely, the durability is improved, the casing has a small diameter, and the structure of the pinion shaft is simplified.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a sectional view showing a second embodiment.

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

[Explanation of symbols]

 1,115 Mechanical supercharger 5,117 Planetary gear type speed-up mechanism 7 Centrifugal air compressor 23 Internal gear 25 Pinion gear 27 Impeller shaft 29 Sun gear 33 Pinion shaft 43 Bearing 95,97 Floating bush (bearing)

Claims (1)

[Claims] 1. An internal gear and a sun gear that mesh with a pinion gear, and a pinion carrier that supports both ends of a pinion shaft that supports the pinion gear. The sun gear increases the engine driving force input from the internal gear. It is equipped with a planetary gear type speed-up mechanism that outputs from, and a centrifugal air compressor that pressurizes the engine intake air by rotating the impeller shaft via a sun gear, and the pinion carrier has an internal gear on the outer periphery via a bearing. A mechanical supercharger characterized by supporting and supporting an impeller shaft on the inner circumference through bearings arranged on both axial sides of the sun gear.