JPH11173155A - Fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support an output side sun gear of a speed-increasing mechanism surely, reduce the cost by simplifying the bearing structure of the sun gear, and facilitate dissembling. SOLUTION: A hydraulic machine is provided with a planetary gear type speed-increasing mechanism 5 which speeds up the driving force of an engine to be input in an internal gear 31 from a pinion gear 33 through the sun gear 37 and a compressor 7 the impeller 67 of which is connected to the sun gear 37 through an impeller shaft 35. A shaft 35 on the one side of the axial direction of the sun gear 37 is supported on the casing 23 side through a bearing 81, and an pinion gear 33 is supported on the casing 23 side, and the extension unit 83 of the shaft 35 installed on the other side in the axial direction of the sun gear 37 is supported by a support unit 85 installed on the pinion gear 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fluid machine for driving a compressor via a planetary gear type speed increasing mechanism.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. Hei. 6-34138 discloses a supercharger 201 as shown in FIGS.
Japanese Patent Publication No. 145738 discloses a supercharger 203 as shown in FIG.

The supercharger 201 shown in FIGS. 5 and 6 includes an input-side belt type continuously variable transmission 205, a planetary gear type speed increasing mechanism 207, a centrifugal air compressor 209, and the like.

The impeller 211 of the air compressor 209
Is connected to a sun gear 215 of the speed increasing mechanism 207 via an impeller shaft 213, and the belt type continuously variable transmission 2
The driving force of the engine input from 05 to the internal gear 217 is increased from the pinion gear 219 via the sun gear 215 to rotate the impeller 211 at high speed.

[0005] The impeller shaft 213 is supported via a bearing holder 221 and slide bearings 223 and 225. As shown in FIG. 5, the impeller shaft 213 and the bearing holder 221 are provided with extensions 227 and 229 on the left side of the sun gear 215, respectively.
The above-mentioned slide bearing 223 is provided on the extension 229 of the bearing holder 221 on the extension 22 of the impeller shaft 213.
7 is supported.

Since the sun gear 215 is supported at two points on both sides in the axial direction, the centering is stabilized,
Good engagement with the pinion gear 219 is maintained, and even when the supercharger 201 is rotated at high speed, vibration, noise, heat, and the like are not generated, and excellent durability is exhibited.

The supercharger 203 shown in FIG.
31, a planetary gear type speed increasing mechanism 233, a centrifugal air compressor 235, and the like.

The impeller 237 of the air compressor 235
Is connected to the sun gear 241 of the speed increasing mechanism 233 via the impeller shaft 239, and the impeller shaft 23
9 is supported on the right side of the sun gear 241 by the bearing holder 243 and the slide bearing 245 as shown in FIG.

[0009]

However, in the supercharger 201 shown in FIGS. 5 and 6, the extended portion 22 of the bearing holder 221 is not provided.
9 requires notches 247 and 247 to avoid interference with the pinion gear 219, and the shape is complicated and the processing cost is high.

Further, the extension 2 is attached to the bearing holder 221.
By providing the gear 29, the procedure of assembling and disassembling the planetary gear type speed increasing mechanism 207 is complicated and troublesome.

In the turbocharger 203 shown in FIG. 7, since the bearing holder 243 does not have the extension 229 as in the bearing holder 221 described above, the procedure for assembling and disassembling the planetary-gear speed increasing mechanism 233 is accordingly reduced. Is simple.

However, with the elimination of the extension of the bearing holder 243, the sun gear 241 loses its support on the left side and is supported by meshing with the pinion gear 249, so that the centering becomes unstable. Therefore, it is difficult to maintain good meshing with the pinion gear 249, and when rotating at high speed, vibration, noise,
The durability of the supercharger 203 (the planetary-gear speed increasing mechanism 233) may be reduced due to heat generation or the like.

When the support of the sun gear 241 is unstable, it is difficult to simplify the support structure of the bearing holder 243 and the slide bearing 245 and reduce the cost.

Therefore, the present invention stably supports the output side sun gear of the planetary gear type speed increasing mechanism, simplifies the bearing structure of the sun gear, reduces the cost, and assembles the speed increasing mechanism and the bearing structure. It is another object of the present invention to provide a fluid machine that facilitates each operation procedure of disassembly.

[0015]

According to the first aspect of the present invention, there is provided a fluid machine.
A planetary gear type speed increasing mechanism for increasing the driving force of the engine input to the internal gear from the pinion gear via the sun gear, and a compressor in which the impeller is connected to the sun gear via an impeller shaft; On one side in the axial direction, the impeller shaft is supported on the casing side via a bearing, and the pinion gear is
The extension portion of the impeller shaft provided on the other side in the axial direction of the sun gear is supported on the outer periphery of the support portion provided on the pinion gear.

The driving force of the engine is increased by a planetary gear type speed increasing mechanism, and the impeller is rotated from the sun gear via the impeller shaft to drive the compressor.

In the fluid machine according to the present invention, the impeller shaft is supported by a bearing on one axial side of the sun gear, and a support portion is provided on the pinion gear on the other axial side of the sun gear, and the support portion extends the extension portion of the impeller shaft. Is supported.

This support structure in which the extension of the impeller shaft is supported by the support portion of the pinion gear stably supports the sun gear, unlike the conventional support structure of FIG. 7 in which the sun gear is supported by gear engagement.

Accordingly, since the sun gear is stably supported on both axial sides, the centering function of the sun gear is greatly improved, and good engagement with the pinion gear is maintained.
Even when rotated at high speed, vibration, noise, heat, etc. do not occur,
The durability is improved.

Further, since the sun gear is stably supported on the other side in the axial direction by the support portion of the pinion gear, the structure of the bearing on one side in the axial direction can be simplified and the cost can be reduced.

With such a simplified bearing structure,
The procedure for assembling and disassembling the bearing structure and the planetary-gear speed-increasing mechanism is simplified, and the operation costs thereof are greatly reduced.

Further, by simplifying the bearing structure, the cost can be further reduced if the bearing holder having a complicated shape and high machining cost as in the conventional examples shown in FIGS. 5 and 7 is eliminated.

According to a second aspect of the present invention, in the fluid machine according to the first aspect, the support portion of the pinion gear supports the extension portion of the impeller shaft while contacting the extension portion. An effect equivalent to the configuration is obtained.

In addition to this, the supporting portion of the pinion gear supports the extended portion of the impeller shaft while contacting, so that
The centering function of the sun gear is further improved.

According to a third aspect of the present invention, in the fluid machine according to the first aspect, a gap is provided between the support portion of the pinion gear and the extension portion of the impeller shaft, and the support portion of the pinion gear is formed in the gap. The extended portion of the impeller shaft is supported via an oil film, and the same effects as those of the first aspect are obtained.

In addition, since minute vibrations are absorbed by the oil film in the gap between the support portion of the pinion gear and the extension of the impeller shaft, the support of the sun gear and the engagement between the sun gear and the pinion gear are further stabilized, and the high speed Vibration, noise, heat generation, and the like during rotation are further reduced, and durability is improved.

Further, since the support portion of the pinion gear does not directly contact the extension portion of the impeller shaft, wear of both portions is prevented, and the durability of the support structure is greatly improved.

The invention according to claim 4 is the invention according to claims 1 to 3.
4. The fluid machine according to claim 1, wherein an outer diameter of the extension of the impeller shaft is the same as a mesh pitch circle of the sun gear, and is equivalent to the configuration of claim 1. To get the effect.

In addition, by making the outer diameter of the extended portion of the impeller shaft equal to the diameter of the meshing pitch of the sun gear, the rolling contact is made on the pitch circle of the sun gear. There is no adverse effect on the meshing of the gears, and torque transmission is performed normally.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. This embodiment corresponds to claims 1, 2,
It has four features. Hereinafter, the left and right directions are the left and right directions in FIG. 1, and members without reference numerals and the like are not shown.

FIG. 1 shows a mechanical supercharger 1 (a fluid machine according to a first embodiment) for a vehicle. The mechanical supercharger 1 has an input pulley 3 and a planetary gear type speed increasing mechanism. It comprises a mechanism 5 and a centrifugal air compressor 7 (compressor).

The input pulley 3 includes a pulley body 9 and a hub 11.
The hub 11 is fixed to the input shaft 15 of the speed increasing mechanism 5 with a key 17 and a nut 19. The input pulley 3 is connected to a pulley on the crankshaft side via a belt, and is driven to rotate by the driving force of the engine.

The input shaft 15 is mounted on a casing by a bearing 21.
It is supported by a boss 25 of the thing 23. Input shaft 15
A lip seal 27 is arranged between the
Prevents oil leakage.

The planetary gear type speed increasing mechanism 5 has an internal gear 31 integrally formed on the flange portion 29 of the input shaft 15 and three gears 3 arranged at regular intervals in the circumferential direction as shown in FIG.
The air conditioner includes a plurality of pinion gears 33 and a sun gear 37 formed on an impeller shaft 35 of the air compressor 7.

The pinion gear 33 is supported on a pinion shaft 41 via a bearing 39. The pinion shaft 41 is supported through a flange member 43 fixed to the casing 23, and includes a ball 45 and a screw 47.
And it is stopped by.

The compressor housing 49 of the air compressor 7 and the casing 23 are provided with a connecting member 53 engaged with the peripheral groove 51 of the casing 23 and a bolt 55 for fixing the connecting member 53 to the compressor housing 49. Are fixed to each other with the flange member 43 interposed therebetween.

An oil seal 57 is arranged between the casing 23 and the flange member 43 to prevent oil leakage.

The sun gear 3 is mounted on the impeller shaft 35.
From the right side of 7, rings 59 and 61, spacers 63, bushes 65, and impellers 67 are mounted and fixed with nuts 69.

The speed increasing mechanism 5 increases the driving force of the engine input from the input pulley 3 to the internal gear 31 from the pinion gear 33 via the sun gear 37, and rotationally drives the impeller shaft 35 (impeller 67) at high speed. I do.

When the impeller 67 rotates, the air compressor 7 sucks the intake air from the suction port 71, pressurizes the suctioned air in the spiral chamber 73 of the compressor housing 49 by the centrifugal force of the impeller 67, and discharges the engine from the discharge port. Supercharge.

A cylindrical bearing holder 75 is press-fitted into the flange member 43, and a step portion 77 and a retaining ring 79 are provided.
And are positioned by.

This bearing holder 75 has a sun gear 3
7, the bearing holder 2 in the conventional example of FIG.
There is no extension 229 formed in 21 and the shape is greatly simplified.

On the right side of the sun gear 37, a slide bearing 81 is arranged on the outer periphery of the spacer 63, and supports the impeller shaft 35.

Further, as shown in FIG.
Is provided with a cylindrical extension 83 on the left side of the sun gear 37, and each pinion gear 33 is provided with a cylindrical support 85 on the left side thereof.

The outer diameter of the extension portion 83 of the impeller shaft 35 is the same as the meshing pitch circle of the sun gear 37.

As shown in FIG. 2, the support portion 85 of each pinion gear 33 supports the extended portion 83 of the impeller shaft 35 by contacting it from three directions.

An appropriate gap 87 is provided between the support portions 85 of the pinion gears 33 to prevent mutual interference.

As described above, the sun gear 37 (the impeller shaft 35) is supported by the slide bearing 81 on the right side in the axial direction, is supported by the support portions 85 on the left side in the axial direction, and is stably supported at two points on both sides in the axial direction. Supported.

A thrust washer 89 is mounted on the bearing holder 75 from the outside in the radial direction. The thrust washer 89 is provided in a groove 9 formed between the rings 59 and 61.
1 and receives the thrust force of the impeller shaft 35.

A bearing holder 75 is provided via an oil plug 93 attached to the casing 23 and a nozzle 95.
Pressurized oil is supplied to an oil passage 97 formed in the flange member 43 from an external oil pump.

An oil film damper is formed between the sliding bearing 81 and the bearing holder 75 by the pressurized oil, and the sliding bearing 81 is supported by the oil film damper in a floating state, and absorbs vibrations to move the impeller shaft 35. To support.

This pressurized oil is also supplied to the groove 91 via an oil passage 99 to lubricate the sliding portion with the thrust washer 89, and further, to provide a lip seal via the oil passage 101 of the input shaft 15. 27 to lubricate it.

Thereafter, the oil forms an oil sump under the casing 23.

The oil in the oil sump is scraped up by the rotation of the internal gear 31 and the pinion gear 33, and lubricates the meshing portion of each gear and the contact portion between the support portion 85 and the extension portion 83. Flange part 2 of shaft 15
9 returns to the oil reservoir by centrifugal force from an oil passage 103 provided in the oil passage 9.

A collar 105 is press-fitted into the bearing holder 75 so as to face the bush 65 on the impeller shaft 35. A piston ring 107 is disposed between the collar 105 and the bush 65 to prevent oil leakage from the casing 23 and intake air leakage from the air compressor 7.

The labyrinth ring 1 is attached to the flange member 43.
09 is fixed by bolts 111. A labyrinth screen is provided between the labyrinth ring 109 and the impeller 67.
A valve 113 is formed to prevent leakage of intake air from the air compressor 7.

A space 115 is formed between the labyrinth ring 109, the bearing holder 75 and the impeller 67, and this space 115 is provided through an air flow passage 117 provided in the flange member 43 and a control valve. To the downstream side of the throttle valve.

When the throttle valve is closed and a negative pressure is generated on the right side of the impeller 67, the space 115 is opened to the atmosphere through the control valve so that the negative pressure is not applied. See
The sealing effect of the screw 113 is greatly improved.

Thus, the mechanical supercharger 1 is configured.

As described above, the mechanical supercharger 1 supports the impeller shaft 35 by the slide bearing 81 on the right side of the sun gear 37, and extends the impeller shaft 35 by the support portion 85 of the pinion gear 33 on the left side of the sun gear 37. 83 are supported.

Unlike the conventional example shown in FIG. 7, the sun gear 37 is thus stably supported on both sides in the axial direction,
Since the ring function is greatly improved, good engagement with the pinion gear 33 is maintained.

Therefore, even when the mechanical supercharger 1 is used in a high-speed rotation range, vibration, noise, heat, etc. are not generated, and excellent durability can be obtained.

Further, since the impeller shaft 35 is stably supported on the left side of the sun gear 37 by the support portion 85 of the pinion gear 33, the bearing holder 75 has an extension 229 like the conventional bearing holder 221 of FIG.
Need not be provided, and unlike the bearing holder 221 having a complicated shape and a high processing cost, the shape is greatly simplified, and the cost is reduced accordingly.

The simplification of the bearing holder 75 allows the bearing holder 75 and the slide bearing 81
In addition, the assembling work and the disassembling work of the planetary gear type speed increasing mechanism 5 are simplified, and the working cost is greatly reduced.

Since the support portion 85 of the pinion gear 33 supports the extension portion 83 of the impeller shaft 35 while directly contacting the same, the centering stabilizing function of the sun gear 37 is extremely high.

Since the outer diameter of the extension portion 83 of the impeller shaft 35 and the meshing pitch circle diameter of the sun gear 37 are made equal to each other, these rolling contacts are made on the pitch circle of the sun gear 37. There is no adverse effect on the meshing between the gear and the pinion gear 33, and the torque transmission is performed normally.

Further, as described above, since the impeller shaft 35 is stably supported on the left side of the sun gear 37 by the support portion 85, the bearing holder 75 and the sliding bearing 8 are supported.
For example, if the impeller shaft 35 is directly supported on the flange member 43 by a ball bearing instead of the bearing structure according to the first embodiment, the right bearing structure and the oil supply structure are greatly simplified, so that the cost is reduced. Can be further reduced.

Next, FIG. 3 and FIG. 4 show the second embodiment of the present invention.
An embodiment will be described. This embodiment is defined in claims 1, 3, and 4.
It has the following features. Hereinafter, the left and right directions are the left and right directions in FIG. 3, and members without reference numerals and the like are not shown.

In the description of FIG. 3, FIG. 4, and the second embodiment, members having the same functions as those of the first embodiment are given the same reference numerals and quoted, and overlapping explanations of these same members are omitted.

FIG. 3 shows a mechanical supercharger 119 (second type) for a vehicle.
The mechanical supercharger 119 includes an input pulley 3, a planetary gear type speed increasing mechanism 121, and a centrifugal air compressor 7.

The speed increasing mechanism 121 includes an internal gear 31 integrally formed with the input shaft 15, three pinion gears 33 arranged at regular intervals in the circumferential direction as shown in FIG. 4, and an impeller shaft of the air compressor 7. 35, and a sun gear 37 formed at the same.

Also, as shown in FIG.
Is provided with a cylindrical extension 83 on the right side of the sun gear 37, and each pinion gear 33 is provided with a cylindrical support 123 on the left side thereof.

As shown in FIGS. 3 and 4, a gap 125 is provided between the support section 123 of each pinion gear 33 and the extension section 83 of the impeller shaft 35. The oil scooped up from the oil sump by the rotation of the pinion gear 33 is supplied.

In the gap 125, an oil film is formed by drag resistance due to the viscosity of the oil, and the support portion 123 of the pinion gear supports the extension portion 83 of the impeller shaft via the oil film.

A gap 127 is provided between the support portions 123 of the pinion gears 33 to prevent mutual interference.

As described above, the sun gear 37 (the impeller shaft 35) is supported by the slide bearing 81 on the right side in the axial direction, is supported by the support portions 123 and the oil film on the left side in the axial direction, and is stable on both sides in the axial direction. Then 2
Point is supported.

The speed increasing mechanism 121 drives the air compressor 7 by increasing the driving force of the engine input from the input pulley 3, and the air compressor 7 pressurizes intake air to supercharge the engine.

Thus, the mechanical supercharger 119 is configured.

As described above, the mechanical supercharger 119 supports the impeller shaft 35 by the slide bearing 81 on the right side of the sun gear 37 and the impeller shaft 35 by the support 123 of the pinion gear 33 and the oil film on the left side of the sun gear 37. 7, the sun gear 37 is stably supported on both sides in the axial direction, and the centering function is greatly improved, so that the meshing with the pinion gear 33 is good. Is kept.

Accordingly, the mechanical supercharger 119 does not generate vibration, noise, heat, etc. even when used in a high-speed rotation range, so that excellent durability can be obtained.

Since the impeller shaft 35 is stably supported by the support portion 123 of the pinion gear 33,
The shape of the bearing holder 75 is greatly simplified, and the cost is accordingly reduced.

The simplification of the bearing holder 75 simplifies the work of assembling and disassembling the bearing holder 75, the slide bearing 81 and the planetary gear type speed increasing mechanism 121, and greatly reduces the working cost. You.

Further, since the minute vibration is absorbed by the oil film formed in the gap 125 between the support portion 123 of each pinion gear 33 and the extension portion 83 of the impeller shaft 35, the support of the sun gear 37 and the sun gear 37, the pinion gear 33 and Are further stabilized, vibration, noise, heat generation and the like during high-speed rotation are reduced, and durability is greatly improved.

The support portion 123 of each pinion gear 33 does not directly contact the extension portion 83 of the impeller shaft 37,
The durability of this support structure is extremely high, since wear on both sides is prevented.

The outer diameter of the extension 83 of the impeller shaft 35 and the meshing pitch circle diameter of the sun gear 37 are the same.
Since these rolling contacts are made on the pitch circle of the sun gear 37, there is no adverse effect on the meshing between the sun gear 37 and the pinion gear 33, and torque transmission is performed normally.

Further, in the mechanical supercharger 119, the sun gear 37 (the impeller shaft 3) is also supported by the support 123.
5) is stably supported, so that the bearing holder 75
If a ball bearing is used instead of the bearing structure using the slide bearing 81, the right bearing structure and the oil supply structure can be simplified, and the cost can be greatly reduced.

[0087]

According to the fluid machine of the present invention, the impeller shaft is supported by a bearing on one side in the axial direction of the sun gear of the planetary gear type speed increasing mechanism, and the pinion gear is supported on the other side in the axial direction of the sun gear. Supports the extension of the impeller shaft.

As described above, the sun gear is stably supported on both sides in the axial direction, and the centering function is improved. Therefore, good meshing with the pinion gear is maintained, and vibration, noise, heat, etc. are generated even when the sun gear is rotated at high speed. No generation and excellent durability is obtained.

Further, since the sun gear is stably supported on the other side in the axial direction by the supporting portion of the pinion gear, the bearing structure on one side in the axial direction can be simplified, and the cost can be greatly reduced. .

Further, the simplification of the bearing structure simplifies the work of assembling and disassembling the bearing structure and the planetary-gear speed-increasing mechanism, and greatly reduces the cost of these operations.

Further, if the bearing holder having a complicated shape and high processing cost is eliminated with the simplification of the bearing structure, the cost can be further reduced.

According to the second aspect of the present invention, the same effect as that of the first aspect is obtained, and the extension of the impeller shaft is supported while the support of the pinion gear is in contact, so that the centering function of the sun gear is further improved. I do.

According to the third aspect of the present invention, the same effect as that of the first aspect is obtained, and a minute vibration is absorbed by the gap between the support portion of the pinion gear and the extension of the impeller shaft by the oil film. And the meshing state between the sun gear and the pinion gear is further stabilized, and the effect of reducing vibration, noise, heat generation, and the like during high-speed rotation and the durability are further improved.

Further, since the support portion of the pinion gear and the extension portion of the impeller shaft do not come into contact with each other and wear of both are prevented, the durability of the support structure is extremely large.

The invention of claim 4 is the invention of claims 1 to 3
In addition to obtaining the same effect as the configuration described above, the rolling contact is performed on the pitch circle of the sun gear by making the extension outer diameter of the impeller shaft and the meshing pitch circle diameter of the sun gear the same, so that the sun gear and the sun gear There is no adverse effect on the engagement with the pinion gear, and torque transmission is performed normally.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG.

FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part of FIG.

FIG. 5 is a longitudinal sectional view of a conventional example.

6 is a front view of a bearing holder used in the conventional example of FIG.

FIG. 7 is a longitudinal sectional view of another conventional example.

[Explanation of symbols]

 1, 119 mechanical supercharger (fluid machine) 5, 121 planetary gear type speed increasing mechanism 7 air compressor (compressor) 23 casing 31 internal gear 33 pinion gear 35 impeller shaft 37 sun gear 67 impeller 83 extension of impeller shaft Portions 85 and 123 Pinion Gear Support 125 Gap between Support 123 and Extension 83

Claims (4)

[Claims] 1. A planetary gear type speed increasing mechanism for increasing the driving force of an engine input to an internal gear from a pinion gear via a sun gear, and a compressor having an impeller connected to the sun gear via an impeller shaft. An impeller shaft is supported on the casing side via a bearing on one axial side of the sun gear, and a pinion gear is supported on the casing side, and the impeller is provided on the other axial side of the sun gear. A fluid machine wherein a shaft extension is supported on an outer periphery of a support provided on a pinion gear. 2. The fluid machine according to claim 1, wherein the support portion of the pinion gear supports the extension portion of the impeller shaft while contacting the extension portion. 3. The invention according to claim 1, wherein a gap is provided between the support portion of the pinion gear and the extension portion of the impeller shaft, and the support portion of the pinion gear is provided via an oil film formed in the gap. A fluid machine for supporting an extension of an impeller shaft. 4. The invention according to claim 1, wherein the outer diameter of the extension of the impeller shaft is the same as the meshing pitch circle of the sun gear. Fluid machinery.