JPH09317674A - Fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent seizure and pressure leakage between the shaft end of a rotor and a casing, by arranging a thinned part in the axial wall of the casing, and arranging a lubricating member in the thinned part between the axial end of the rotor and the axial wall of the casing. SOLUTION: Thinned parts 71, 73 are formed in the left cover 26 of a compressor casing 13 and a casing main body 23, and solid lubricants 19 are arranged in the thinned parts 71, 73. Then, the solid lubricants 19 are pushed and pressed to axial end surfaces of rotors 15, 17 by coil springs 77 (energizing members) through plates 75. Further, discharge pressure is applied from an ejection opening 69 to the solid lubricants 19 through a channel 79. Hereby, clearances 81, 83 among the axial end surface of the rotors 15, 17 and the axial wall of the compressor casing 13 can be lubricated, and seizure among the rotors 15, 17 and the casing 13 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid machine used for, for example, a supercharger of a vehicle.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 7-27072 discloses a screw type pump 201 (fluid machine) as shown in FIG.

The screw type pump 201 is constructed to rotate the screw rotors 207 and 209 from the speed increasing gear set 203 through the timing gear set 205. The timing gear set 205 includes these rotors 20.
7, 209 are meshed so as not to contact each other. The rotors 207 and 209 are rotatably housed in a casing 211.

[0004]

[Problems to be Solved by the Invention] Screw type pump 2
In 01, the pump efficiency is reduced due to pressure leakage, and the rotor 2
In order to prevent contact between the rotors 07 and 209 or between the rotors 207 and 209 and the casing 211 and seizure due to the contact, the gap between the rotors 207 and 209 and the rotor 20
The gap between No. 7, 209 and the casing 211 is adjusted to a predetermined value.

For the same reason, the rotors 207 and 209 are
213, 21 between the axial end surface of the casing and the casing 211
5 also needs to be adjusted, and if the gaps 213 and 215 are too large, the pump efficiency is lowered due to the pressure leakage as described above.

In order to adjust the clearance, conventionally, the rotor 207,
There is a method of coating 209. However, the coating is costly.

Therefore, an object of the present invention is to provide a fluid machine which can prevent seizure and pressure leakage between an axial end portion of a rotor and a casing at low cost without coating.

[0008]

A fluid machine according to a first aspect of the present invention includes a pair of rotors meshing with each other, a casing rotatably including the rotors, and having a fluid inlet and an outlet, and a casing of the casing. A lightening member provided on the axial wall portion; and a lubricating member arranged in the lightening portion and supplying a lubricant to a gap between the axial end portion of the rotor and the axial wall portion of the casing. Characterize.

As described above, in the fluid machine according to the first aspect of the present invention, the wall portion in the axial direction of the casing is provided with the lightening portion, and the lubricating member is arranged in the lightening portion, and the axial end portion of the rotor and the axial direction of the casing. Since the lubricant is supplied to the gap with the wall portion, a large lubrication effect and seizure prevention effect can be obtained between the axial end portion of the rotor and the casing.

Therefore, it is not necessary to coat the axial end portion of the rotor, and an increase in cost can be avoided. or,
Since seizure is prevented, the gap between the axial end portion of the rotor and the casing can be narrowed, which reduces pressure leakage and improves the efficiency of the fluid machine. Furthermore, the weight of the casing is reduced by providing the lightening portion.

The invention according to claim 2 is the fluid machine according to claim 1, characterized in that the lubricating member is obtained by impregnating a porous soft holding member with a semi-solid lubricant.
An effect equivalent to that of the configuration of claim 1 is obtained.

In addition to this, by impregnating the semi-solid lubricant into the porous soft holding member, the holding property of the lubricant is enhanced, and a large lubricating effect and seizure preventing effect can be obtained for a long period of time.

The invention according to claim 3 is the fluid machine according to claim 1, characterized in that the lubricating member is obtained by impregnating a porous hard holding member with a solid lubricant. An effect equivalent to that of the item 1 is obtained.

In addition to this, by impregnating the porous hard holding member with the solid lubricant, the holding property of the lubricant is enhanced, and a large lubricating effect and seizure preventing effect can be obtained for a long period of time.

The invention according to claim 4 is the fluid machine according to claim 1, characterized in that the lubricating member is a semi-solid lubricant or a solid lubricant arranged directly in the lightening portion,
An effect equivalent to that of the configuration of claim 1 is obtained.

In addition to this, since the lubricating member is directly arranged in the lightening portion, a holding member for holding the lubricating member in the lightening portion is unnecessary, and the cost can be reduced accordingly.

The invention according to claim 5 is the fluid machine according to any one of claims 1 to 4, characterized in that pressure is applied to the lubricating member by an urging member. Therefore, an effect equivalent to that of the configuration of claim 4 is obtained.

In addition to this, by pressing the lubricating member with the biasing member, the supply of the lubricant is promoted, and the lubricating effect and the seizure preventing effect are improved.

The invention according to claim 6 is the fluid machine according to any one of claims 1 to 4, characterized in that a pressure is applied to the lubricating member by a fluid pressure. Therefore, an effect equivalent to that of the configuration of claim 4 is obtained.

In addition to this, for example, by applying pressure to the lubricating member by the fluid pressure generated at the discharge port, the supply of the lubricant is promoted, and the lubrication effect and the seizure prevention effect are improved.

Further, since the fluid pressure is used as the means for applying the pressure to the lubricating member, it is not necessary to separately prepare a pressurizing means.
It can be implemented at such a low cost.

A seventh aspect of the present invention is the fluid machine according to any one of the first to sixth aspects, wherein the rotor is connected to a timing gear group or each rotor that meshes without contacting each other. Has an increased speed gear set,
An oil passage for guiding the lubricating oil of these gear sets to the lightening portion is provided, and effects equivalent to those of the first to sixth aspects are obtained.

In addition to this, since the lubricating oil is guided from the existing gear set to the lightening portion, the lubricating effect and the seizure preventing effect are further improved, and these effects can be obtained for a long period of time.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The first aspect of the present invention will be described with reference to FIGS.
An embodiment will be described. This embodiment is defined in claims 1, 4,
It has 5 and 6 features. FIG. 1 shows a supercharger 1 (fluid machine) of this embodiment, and the left and right directions are the left and right directions in FIG. Further, members and the like not given reference numerals are not shown.

The supercharger 1 includes an input pulley 3,
It comprises a roots type compressor 5, a timing gear set 7, and the like.

The input pulley 3 is spline-connected to the rotor shaft 9 on the input side and fixed by a nut 11. The input pulley 3 is connected to a pulley on the crankshaft side via a belt. An electromagnetic clutch is incorporated in the pulley on the crankshaft side, and connects and disconnects the engine and the supercharger 1.

Thus, the input pulley 3 is rotationally driven by the driving force of the engine via this electromagnetic clutch.

The compressor 5 includes a compressor casing 13 (casing), rotors 15 and 17 having a cocoon-shaped cross section disposed therein, solid lubricants 19 and 19 (lubricating members), and a means for pressurizing the solid lubricant 19. 21 and 21 are provided.

The compressor casing 13 includes covers 25, 27 on the left and right sides of the casing body 23 and bolts 29, 3.
The timing gear set 7 is housed between the casing body 23 and the right cover 27.

One rotor 15 is constructed by spline connecting the input side rotor shaft 9 to the shaft hole 35 of the rotor body 33, and the other rotor 17 is composed of the shaft hole 39 of the rotor body 37.
The rotor shaft 41 is spline-connected to each other.
The rotor bodies 33 and 37 have protrusions 43 that mesh with each other.
45, and the convex portions 43, 45 are formed with hollow portions 47, 49 in the axial direction to reduce the moment of inertia.

The clearance between each rotor 15, 17 and the compressor casing 13 is adjusted to a predetermined value.

The rotor shafts 9 and 41 are connected to the rotor body 33,
The left side of 37 is supported by the compressor casing 13 by the seal type ball bearings 51 and 53, and the right side of the rotor bodies 33 and 37 is supported by the compressor casing 13 by the ball bearings 55 and 55. Further, seals 57, 57 are arranged between the rotor shafts 9, 41 and the compressor casing 13 on the right end side.

Oil is enclosed between the casing body 23 and the right cover 27, and the ball bearing 5
Lubricate 5, 55 and the timing gear set 7.

The seal type ball bearings 51 and 53 and the seals 57 and 57 prevent air from leaking to the outside, and the seals 57 and 57 prevent oil from leaking from the cover 27 side to the rotor bodies 33 and 37 side. .

The timing gear set 7 comprises a pair of timing gears 59 and 61 meshing with each other. The timing gear 59 is fixed to the right end side of the rotor shaft 9 by a lock mechanism 63, and the timing gear 61 is attached to the right end part of the rotor shaft 41. It is press-fitted.

The lock mechanism 63 has a taper ring 65 and a nut 67 screwed to the right end of the rotor shaft 9, and the taper ring 65 is provided between the timing gear 59 and the rotor shaft 9.
Is pushed by a nut 67 to position the timing gear 59 in the rotational direction with respect to the rotor shaft 9.

To position the timing gear 59 in the rotational direction, first, the rotors 15 and 17 are meshed with each other so that the gaps formed between the rotors 15 and 17 in the rotational direction and on the opposite side are uniform, and then the timing is adjusted. The gear 59 is engaged with the timing gear 61.

The engine driving force input from the pulley 3 drives the compressor 5 to rotate, and the rotors 15 and 17 send the intake air sucked from the suction port of the compressor casing 13 to the discharge side and discharge it from the discharge port 69 (outlet port). Supply to the engine.

As shown in FIGS. 1 to 3, the left cover 25 and the casing body 23 of the compressor casing 13 are provided with lightening portions 71 and 73, respectively, and the solid lubricant 19 is formed by the lightening portions 71. , 73.

The pressurizing means 21, 21 are composed of a plate 75 and a coil spring 77 (urging member) for pressurizing the solid lubricant 19 via the plate 75. The solid lubricant 19 is applied to the rotor 15, It is pressed against the axial end face of 17.

Further, the discharge pressure is applied to the solid lubricant 19 from the discharge port 69 through the flow path 79.

By the solid lubricant 19 thus arranged in the lightening portions 71, 73, the lubricant is applied to the gaps 81, 83 between the axial end faces of the rotors 15, 17 and the axial wall of the compressor casing 13. Is supplied to the rotors 15, 1
The seizure between 7 and the compressor casing 13 is prevented.

The supply of the lubricant from the solid lubricant 19 is accelerated by the pressurizing means 21 and the discharge pressure. Thus, the supercharger 1 is constructed.

As described above, in the supercharger 1, the lightening portion 7 provided in the compressor casing 13 is provided.
Since the solid lubricant 19 is arranged on the rotors 1 and 73, the rotor 1
Seizure is prevented in the gaps 81 and 83 between the axial end portions of 5 and 17 and the compressor casing 13.

Therefore, it is not necessary to coat the axial end portions of the rotors 15 and 17, and the cost increase can be avoided. In addition, since the seizure is prevented, the above-mentioned gap 8
1, 83 can be made narrower, the pressure leakage is reduced accordingly, and the efficiency of the compressor 5 is improved.

Further, the compressor casing 13 is lightened only by providing the lightening portions 71 and 73.

Further, since the pressure is applied to the solid lubricant 19 by the pressurizing means 21 (coil spring 77) and the fluid pressure generated at the discharge port 69, the supply of the lubricant to the gaps 81 and 83 is promoted. The effect of preventing seizure is improved.

Further, the solid lubricant 1 is applied to the lightening portions 71 and 73.
Since 9 is directly arranged, a holding member for holding the lubricant in the lightening portions 71 and 73 is unnecessary, and the cost can be reduced accordingly.

Examples of the solid lubricant include molybdenum disulfide, graphite, fluorine resin (PTFE) and the like.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is claimed in claims 1, 2, 5, 6, 7.
It has the following features. FIG. 4 shows a supercharger 85 (fluid machine) of this embodiment.

This supercharger 85 is obtained by replacing the lubricating member (solid lubricant 19) in the supercharger 1 of the first embodiment with another lubricating member. Therefore, the member having the same function as the supercharger 1 is The same reference numerals are given, and duplicate description of these same functional members is omitted.

The cover 25 on the left side of the compressor casing 13 and the casing body 23 have a lightening portion 87,
89 is formed, and a felt 91 containing grease (semi-solid lubricant) is contained in the lightening portions 87, 89.
(Porous soft holding member) is packed.

A coil spring 93 (biasing member) is used to attach a felt 9 to each of the thinned portions 87 and 89 through a plate 95.
A pressing means 97 for pressing 1 is arranged.

Further, the discharge pressure is applied to the felt 91 from the discharge port 69 through the flow path 79.

Thus, the felt 91 containing grease
By arranging the inside of the thinned portions 87 and 89, grease is supplied to the gaps 81 and 83 between the axial end surfaces of the rotors 15 and 17 and the axial wall portions of the compressor casing 13, and the rotors 15 and 17 and the compressors The seizure with the casing 13 is prevented.

The supply of grease from the felt 91 is promoted by the pressurizing means 97 and the discharge pressure.

In addition to this, the casing main body 23 is provided with an oil flow path 99, and the oil on the cover 27 side is guided from this oil flow path 99 to the thinned portion 89, and a gap 81 is provided via a felt 91. , 83 to enhance the lubrication effect.

In this way, the supercharger 85 is constructed. As described above, in the supercharger 85, the lightening portion 8 provided in the compressor casing 13
Since the felt 91 containing grease is arranged on the surfaces 7 and 89, seizure is prevented in the gaps 81 and 83 between the axial ends of the rotors 15 and 17 and the compressor casing 13.

Therefore, it is not necessary to coat the axial end portions of the rotors 15 and 17, and the cost increase can be avoided. In addition, since the seizure is prevented, the above-mentioned gap 8
1, 83 can be made narrower, the pressure leakage is reduced accordingly, and the efficiency of the compressor 5 is improved.

Further, the compressor casing 13 is lightened only by providing the lightening portions 87 and 89.

Further, since the pressurizing means 97 (coil spring 93) and the fluid pressure generated at the discharge port 69 apply pressure to the felt 91 to promote the supply of grease to the gaps 81 and 83, the lubricating effect and the seizure preventing effect are obtained. And have improved.

Further, since the felt 91 is impregnated with grease, the holding property is improved, and a large lubricating effect and seizure preventing effect can be obtained for a long period of time.

Further, by supplying oil from the oil flow path 99 to the thinned portion 89, the lubrication effect and the seizure prevention effect are further improved.

Examples of the grease of the semi-solid lubricant include lithium-based, sodium-based, and aluminum-composite-based grease in the case of soap-based grease, and poly-wafer and sodium terephthalate in the case of non-soap-based grease. Mate,
There are phthalocyanine and induslen.

The porous soft holding member may be a sponge member such as polyurethane in addition to the fibrous member such as felt.

Further, as in the third aspect, the lubricating member may be a porous hard holding member such as a sintered alloy impregnated with a solid lubricant.

The fluid machine of the present invention may be one using a screw rotor, or not only one that converts rotation into fluid pressure such as a compressor or blower,
It may be used as a motor that applies fluid pressure to take out rotation.

[0068]

In the fluid machine according to the first aspect of the invention, since the lubricating member is arranged in the lightening portion provided on the axial wall portion of the casing, the gap between the axial end portion of the rotor and the axial wall portion of the casing is provided. Thus, a large lubrication effect and seizure prevention effect can be obtained.

Therefore, it is not necessary to coat the axial end portion of the rotor, the cost increase can be avoided, and seizure can be prevented. Therefore, the gap between the axial end portion of the rotor and the casing can be narrowed. As a result, pressure leakage is reduced and efficiency is improved. Further, the weight of the casing is reduced by providing the lightening portion.

According to the second aspect of the present invention, the same effect as that of the first aspect can be obtained, and since the semi-solid lubricant is impregnated in the porous soft holding member, the holding property of the lubricant is enhanced. A large lubrication effect and seizure prevention effect can be obtained over a long period of time.

According to the third aspect of the present invention, the same effect as that of the first aspect can be obtained, and since the solid lubricant is impregnated in the porous hard holding member, the holding property of the lubricant is improved and the long-term A large lubrication effect and seizure prevention effect can be obtained.

The invention according to claim 4 has the same effect as that of the structure of claim 1, and since the lubricating member is directly arranged in the lightening portion, the holding member for holding the lubricating member in the lightening portion is provided. It is unnecessary and can be implemented at low cost.

According to the fifth aspect of the present invention, the same effect as that of the first to fourth aspects is obtained, and the pressure is applied to the lubricating member by the biasing member, whereby the supply of the lubricant is promoted and the lubrication is performed. The effect and the anti-seizure effect are improved.

According to the sixth aspect of the present invention, the same effects as those of the first to fourth aspects are obtained, and the supply of the lubricant is promoted by applying the pressure to the lubricating member with the fluid pressure, and the lubricating effect is obtained. And the anti-seizure effect is improved.

Further, since the fluid pressure is used as the means for applying the pressure to the lubricating member, it is not necessary to separately prepare the pressurizing means.
It can be implemented at such a low cost.

The seventh aspect of the present invention obtains the same effects as those of the first to sixth aspects, and since the lubricating oil is guided from the existing gear set to the lightening portion, a large lubricating effect is obtained over a long period of time. A seizure prevention effect can be obtained.

[Brief description of drawings]

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

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view showing a second embodiment of the present invention.

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

[Explanation of symbols]

 1, 85 Supercharger (fluid machine) 7 Timing gear set 13 Compressor casing (casing) 15, 17 Rotor 19 Solid lubricant (lubricating member) 69 Discharge port (outlet) 71, 73, 87, 89 Lightening part 77, 93 coil spring (biasing member) 81, 83 gap 91 felt (porous soft holding member) 99 oil flow path

Claims (7)

[Claims] 1. A pair of rotors meshing with each other, a casing that rotatably includes these rotors and has a fluid inlet and a fluid outlet, and a thinned portion provided on an axial wall portion of the casing. A fluid machine comprising: a lubricating member arranged in the lightening portion and supplying a lubricant to a gap between an axial end of the rotor and an axial wall of the casing. 2. The fluid machine according to claim 1, wherein the lubricating member is a porous soft holding member impregnated with a semi-solid lubricant. 3. The fluid machine according to claim 1, wherein the lubricating member is a porous hard holding member impregnated with a solid lubricant. 4. The fluid machine according to claim 1, wherein the lubricating member is a semi-solid lubricant or a solid lubricant arranged directly in the lightening portion. 5. The fluid machine according to claim 1, wherein the urging member applies pressure to the lubricating member. 6. A fluid machine according to any one of claims 1 to 4, wherein a pressure is applied to the lubricating member by a fluid pressure. 7. The invention according to any one of claims 1 to 6, further comprising: a timing gear set for meshing the rotors without contacting each other or a speed increasing gear set connected to the rotors. A fluid machine having an oil flow path for guiding the lubricating oil of these gear sets to the lightening portion.