JPH10141264A - Fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a cover for housing a gear pair and also to reduce a cost. SOLUTION: In a fluid machine provided with a casing 19 housing a pair of rotors 13, 15, a cover 21 fixed in the axial direction of the casing 19, a gear chamber 33 formed between a wall part 31 of the casing 19 and the cover 21, and a gear pair 17 to be rotated by being interlocked with the rotors 13, 15 through rotor shafts 7, 47 in the gear chamber 33, an overhang part 35 is provided on the cover 21 side of the casing 19, and a taper threaded hole for an oil plug is provided on the overhang part 35.

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 Utility Model Publication No. 3-129733 discloses an "supercharger for an engine".

[0003] This is an air compressor for supercharging the engine, and a speed increasing gear set for increasing the driving force of the engine and transmitting it to the air compressor, and a timing gear set for synchronously rotating the rotors of the air compressor so as not to contact each other. And

[0004] Gear chambers are formed by covers on both axial sides of the compressor casing, and a speed increasing gear set and a timing gear set are accommodated in the respective gear chambers.

[0005] Each gear chamber is provided with an oil reservoir for lubricating the speed increasing gear set and the timing gear set, and each cover is provided with an oil filler for injecting oil into the gear chamber.

FIG. 6 shows a supercharger 201 having a configuration similar to this supercharger.

The supercharger 201 is of a type that does not have a speed increasing gear set, and includes an input pulley 203, a roots type air compressor 205, and a timing gear set 207.
It is composed of The casing 209 of the air compressor 205 includes a case body 211 and a case side wall 213.
The timing gear set 207 includes a gear chamber 21 formed between the case side wall 213 and the cover 215.
7. An oil reservoir is provided in the gear chamber 217 to lubricate the bearings 223 and 225 and the timing gear set 207 on one side that supports the rotor shafts 219 and 221.

An oil filler 227 for injecting oil into the gear chamber 217 is screwed to the cover 215.

[0009]

The compressor casing is a casting because the compressor casing is required to have strength for supporting the rotor and a certain thickness is required for that. Therefore, it is difficult to reduce weight and cost with a compressor casing.

However, in any of the above examples, since the oil filler is attached to the cover, the cover needs a thick portion for cutting a screw for screwing the oil filler. Therefore, the cover is also a casting, and is heavy and expensive.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluid machine capable of reducing the weight and cost of a cover for accommodating a gear set that rotates in conjunction with a rotor.

[0012]

According to a first aspect of the present invention, there is provided a fluid machine including a pair of rotors meshing with each other, a casing including the rotors, and having a fluid inlet and a fluid outlet, and an axial direction of the casing. And a cover fixed to the
A gear chamber formed between the wall of the casing and the cover, an oil sump provided in the gear chamber, and a rotor housed in the gear chamber and connected to the rotor via a rotor shaft passing through the wall of the casing. A fluid machine having a gear set that rotates in an interlocking manner, wherein an overhang portion having a joint surface with a cover is provided on a casing, and an opening for attaching an oil plug is provided in the overhang portion.

As described above, in the configuration of the first aspect, the casing is provided with the overhang portion, and the opening for attaching the oil plug is provided in the overhang portion.
It is no longer necessary to provide a thick part for screwing an oil plug on the cover.

Therefore, there is no need to cast the cover,
For example, the use of sheet metal makes it possible to significantly reduce weight and cost.

The provision of the overhang portion improves the rigidity of the casing.

According to a second aspect of the present invention, in the fluid machine according to the first aspect, the gear set includes a pair of timing gears connected to each rotor shaft, and the two rotors are synchronized so as not to contact each other. This is a timing gear set to be rotated, and the same effects as those of the first aspect are obtained.

According to a third aspect of the present invention, in the fluid machine according to the first or second aspect, the boss for supporting the bearing of the rotor shaft is formed so as to protrude from the wall of the casing toward the gear chamber. The axial height of the joint surface of the overhang portion is equal to or higher than the axial height of each of the boss portions, wherein the overhang portion has an axial height of at least one of the boss portions.
The same effect as that of the configuration is obtained.

Also, the joint surface of the overhang portion that comes into contact with the cover requires machining, but if the boss portion of the bearing protrudes higher than the overhang portion, the protruding boss portion hinders the overhang. Machining of parts is difficult.

Furthermore, in this case, the joining surface of the overhang portion and the end surface of the boss portion must be machined in separate steps, which disadvantageously increases the number of working steps.

Therefore, in the structure of claim 3, the height of the overhang portion is equal to or the same as the height of the boss portion of the bearing.
Or, I raised it.

If the overhang portion is at the same height as the boss portion, it is possible to machine them simultaneously.
The number of processing steps can be greatly reduced.

Further, if the overhang portion is made higher than the boss portion, machining of the overhang portion can be easily performed without disturbing the boss portion. In addition, since the end surface of the boss portion is not a joining surface, machining can be omitted in this case.

According to a fourth aspect of the present invention, there is provided the air breather according to any one of the first to third aspects, wherein the overhang portion has an air breather for keeping the internal pressure of the gear chamber constant and preventing oil from being blown out. An opening for attachment is provided, and an effect equivalent to that of any one of the first to third aspects is obtained.

In addition to this, the internal pressure of the gear chamber is kept constant by the air breather attached to the overhang portion, thereby preventing oil from being blown out.

Also, without attaching the air breather to the cover,
By attaching the cover to the overhang portion, the cover can be formed by sheet metal processing, and the weight and cost can be significantly reduced.

[0026]

1 to 3 show a first embodiment of the present invention.
An embodiment will be described. This embodiment has the features of the first and second aspects. FIG. 1 shows a supercharger 1 (fluid machine) according to this embodiment. In the following description, the left and right directions are the left and right directions in FIG. 1, and FIG. 2 is drawn left and right opposite to FIG. 1. In addition, members and the like without reference numerals are not shown.

The supercharger 1 has an input pulley 3,
It is composed of a roots type compressor 5 and the like.

The input pulley 3 is spline-connected to a rotor shaft 7 on the input side, and is fixed by a nut 9. The input pulley 3 is connected to a pulley on the crankshaft side via a belt, and an electromagnetic clutch is incorporated in the pulley on the crankshaft side. The electromagnetic clutch connects and disconnects the engine and the supercharger 1.

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

The compressor 5 has a compressor casing 11 (casing), cocoon-shaped rotors 13 and 15 disposed therein, a timing gear set 17 and the like.

The compressor casing 11 comprises a casing body 19 and left and right covers 21, 23, etc. The cover 21 is fixed to the left side of the casing body 19 with bolts 25, and the cover 23 is fixed to the right side of the casing body 19 with bolts 27. ing. The casing body 19 is provided with cooling fins 29 for cooling the compressor 5.

The left cover 21 is made by sheet metal working of a thin steel plate.

The wall 31 and the cover 2 of the casing body 19
1, a gear chamber 33 is formed.
Is provided with an oil reservoir. Timing gear set 1
7 is housed in this gear chamber 33.

An overhang portion 35 is formed in the casing body 19 on the gear chamber 33 side, and an oil seal 37 is disposed between the overhang portion 35 and the cover 21 to prevent oil leakage. .

One of the rotors 13 comprises a rotor body 38 and the input side rotor shaft 7, and the rotor shaft 7 and the rotor body 38 are provided with small- and large-diameter press-fit portions 39, 41 provided therebetween. And the spline portion 43.
The other rotor 15 also includes a rotor main body 45 and a rotor shaft 47, and the rotor shaft 47 and the rotor main body 45 are fixed by small- and large-diameter press-fit portions 49 and 51 and a spline portion 53 provided therebetween. Have been.

Protrusions 55 and 57 that mesh with each other are formed on each of the rotor bodies 38 and 45.
5, 57 are provided with hollow portions 59, 61 in the axial direction to reduce the moment of inertia of the rotors 13, 15, respectively.

Bosses 63 and 65 projecting toward the gear chamber 33 are provided on the wall 31 of the casing body 19, and bosses 67 and 69 are provided on the right cover 23.
Each of the rotor shafts 7 and 47 is provided on the left side of the rotor bodies 38 and 45 by ball bearings 71 and 73, respectively.
3 and 65, and on the right sides of the rotor bodies 38 and 45, are respectively supported by bosses 67 and 69 by seal type ball bearings 75 and 77, respectively. A bearing cap 79 is attached to the opening of the boss portion 69 to prevent intrusion of dust and the like.

On the left side of the rotor bodies 38, 45, seals 81, 8 are provided between the bosses 63, 65 and the rotor shafts 7, 47.
3 is provided to prevent air leakage and oil leakage.
On the right side of the rotor bodies 38 and 45, air leakage and oil leakage are prevented by seal type ball bearings 75 and 77.

The center positions of the rotor shafts 7, 47 and the boss 6
The cover 23 and the casing main body 19 are aligned by positioning pins 85 so as to align the center positions of 7 and 69.

The bearings 75 and 77 have bosses 67 and 69
Bearings 75 and 77 and the boss 6
7 and 69, respectively, a plate 87 and a disc spring 89
Are arranged to absorb the vibrations of the rotors 13 and 15 in the axial direction. The disc spring 89 absorbs and permits movement of the bearings 75 and 77 when the temperature of the compressor 5 rises and the rotor shafts 7 and 47 thermally expand.

The timing gear set 17 includes a pair of timing gears 91 and 93 meshing with each other, and the timing gear 93 is press-fitted into the left end of the rotor shaft 47.
The timing gear 91 has a taper ring fixing mechanism 95.
To the left end of the rotor shaft 7.

The taper ring fixing mechanism 95 includes a nut 97 and a taper ring 99. The nut 97 pushes the taper ring 99 between the rotor shaft 7 and the timing gear 91 to position the timing gear 91 in the rotation direction. Fix it.

To adjust the phase of the timing gear set 17, first, the projections 55 and 57 of the rotors 13 and 15 are engaged with each other so that the gaps formed on both sides in the rotational direction are uniform. The timing gear 91 is engaged with the timing gear 93, and in this state, the timing gear 91 is positioned in the rotation direction by the taper ring fixing mechanism 95 as described above, and the phases of the timing gears 91 and 93 are adjusted.

The driving force of the engine input from the pulley 3 drives the compressor 5 to rotate, and the timing gear set 17 rotates the rotors 13 and 15 synchronously so as not to contact each other. The compressor 5 draws the suction and discharge ports 103 from the suction port 101 (inflow port) by the rotation of the rotors 13 and 15.
The engine is supercharged with the intake air discharged from the (outlet).

As described above, the gear chamber 33 provided between the wall portion 31, the overhang portion 35, and the left cover 21 of the casing body 19 is provided with an oil sump.
The timing gear 91 disposed below and immersed in the oil sump lifts up the oil to lubricate the meshing portion with the timing gear 93 and the ball bearings 71 and 73.

Also, the boss portions 63 of the bearings 71 and 73,
An oil passage 105 is provided in 65, and guides oil from the oil sump and scraping oil to the seals 81 and 83 for lubrication.

As shown in FIGS.
9 has a tapered screw hole 107 in the overhang portion 35.
(Opening), and an oil plug is always screwed. To form an oil reservoir in the gear chamber 33, the oil plug is removed and oil is injected through the tapered screw hole 107.

As shown in FIG. 1, the overhang portion 35
The height in the axial direction of the joint surface 109 at which the
The height of each of the end surfaces 111 and 113 of the bosses 63 and 65 is lower than the height in the axial direction.

Thus, the supercharger 1 is configured.

In the supercharger 1, as described above, the casing body 19 is provided with the overhang portion 35, and the overhang portion 35 is provided with the taper screw hole 107 for the oil plug. It is no longer necessary to provide a thicker portion for cutting the tapered screw hole 107 in the second embodiment.

Therefore, the cover 21 does not need to be made of a casting, and can be made of sheet metal as described above. By making the cover 21 of sheet metal, the weight and cost are greatly reduced.

Further, the structure of the casing 11 is simplified.

Further, by providing the overhang portion 35, the rigidity of the casing 11 is improved accordingly.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has the features of claims 1, 2, and 3. FIG. 4 shows a supercharger 115 (fluid machine) according to this embodiment.

In the description of the second embodiment, the first
Members having the same functions as those of the supercharger 1 of the embodiment are given the same reference numerals and quoted.

An overhang portion 117 is formed on the gear chamber 33 side of the casing body 19, and a cover 119 is fixed to the overhang portion 117 with bolts 25. An oil seal 37 is disposed between the overhang portion 117 and the cover 119 to prevent oil leakage.

The cover 119 is formed by sheet metal working of a thin steel plate.

Although not shown, the overhang portion 1
17 is provided with a tapered screw hole (opening). An oil plug is always screwed into the tapered screw hole, and an oil reservoir in the gear chamber 33 is formed by putting oil through the tapered screw hole from which the oil plug has been removed.

As shown in FIG.
The height in the axial direction of the joint surface 121 at which the cover 7 contacts the cover 119 is determined by the end surface 1 of the bosses 63 and 65 of the bearings 71 and 73.
It is the same height as 11 and 113.

Thus, the supercharger 115 is configured.

As described above, the supercharger 115
By providing a tapered screw hole for an oil plug in the overhang portion 117 of the casing body 19, the cover 119 can be made of sheet metal. Has been greatly reduced.

The rigidity of the casing 11 is improved by providing the overhang portion 117.

The joining surface 12 of the overhang portion 117
No. 1 requires machining, but the overhang portion 117
Is lower than the boss portions 61 and 63, the boss portions 61 and 63 are in the way and it is difficult to machine the overhang portion 117. In this case, the joining surface 121 and the end surfaces 111 and 1
Thirteen machining operations must be performed in a separate process, which is disadvantageous because the number of processing steps increases accordingly.

Therefore, in the supercharger 115,
The bonding surface 121 of the overhang portion 117 is
By having the same height as the end surfaces 111 and 113 of the 65, these can be machined at the same time, and the number of processing steps is greatly reduced.

The overhang portion 117 is connected to the boss 6
Even if the height is higher than 1, 63, machining of the overhang portion 117 can be easily performed without disturbing the boss portions 61, 63. Since the ends 111 and 113 of the bosses 61 and 63 are not joint surfaces, in this case, machining of the ends 111 and 113 can be omitted.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment has the features of claims 1, 2, and 4. FIG. 5 shows a supercharger 123 (fluid machine) according to this embodiment. The upper part of FIG. 5 is the upper part in the direction of gravity. In addition, members and the like without reference numerals are not shown.

In the description of the third embodiment, members having the same functions as those of the supercharger 1 of the first embodiment are given the same reference numerals and quoted.

As shown in FIG. 5, in the overhang portion 35 of the casing body 19, in addition to the taper screw hole 107 (opening) for the oil plug, a screw hole 125 (opening) is provided at the upper part.
And an air breather 127 is attached.

Thus, the supercharger 123 is configured.

As in the case of the supercharger 1, the weight and cost of the supercharger 123 are greatly reduced by forming the cover 21 from sheet metal, and the rigidity of the casing 11 is improved by the overhang portion 35. .

In addition to this, the supercharger 123
In the embodiment, the internal pressure of the gear chamber 33 is kept constant by the air breather 127 attached to the overhang portion 35, and the oil is prevented from being blown out.

In addition, since the air breather 21 is attached to the overhang portion 35 without being attached to the cover,
The cover 21 is made of sheet metal to reduce weight and cost.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, a tapered screw hole 151 (opening) for oil filler is provided above the overhang portion 35 of the casing body 19, and a tapered screw hole 1 for lubricating oil drain is provided below the overhang portion 35.
53 are provided and each is plugged.

As described above, the tapered screw holes 151 and 153
Is provided on the overhang portion 35, so that the cover 2
1 is made of sheet metal to reduce weight and cost.

In a fluid machine having a speed increasing device on the input side, an overhang portion is provided on the speed increasing device side of the casing body, and an opening for attaching an oil plug is provided in the overhang portion, so that the input side is also provided. It becomes possible to use a cover made of sheet metal, and it is possible to greatly reduce weight and cost.

The fluid machine of the present invention may be of a screw type using a screw rotor. Further, it may be used not only as a compressor or a blower for converting rotation into fluid pressure but also as a motor for extracting rotation by applying fluid pressure.

[0077]

According to the fluid machine of the first aspect, as described above,
By providing the opening for the oil plug in the overhang portion provided in the casing, the cover can be processed by sheet metal, and the weight and cost can be significantly reduced.

Further, the rigidity of the casing was improved by providing the overhang portion.

According to the second aspect of the invention, the same effect as that of the first aspect is obtained.

According to the third aspect of the present invention, the same effect as that of the first or second aspect is obtained, and if the overhang portion and the boss portion are made the same height, they can be machined simultaneously. And the number of processing steps can be greatly reduced.

If the overhang portion is made higher than the boss portion, machining of the overhang portion can be easily performed without disturbing the boss portion.

According to the fourth aspect of the invention, the same effect as any of the first to third aspects is obtained, and the internal pressure of the gear chamber is kept constant by the air breather attached to the overhang portion. Oil blowing is prevented.

Also, without attaching the air breather to the cover,
Claim 1 by attaching to the overhang portion
Similarly to the above configuration, it is possible to significantly reduce the weight and cost by processing the cover into a sheet metal.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, and corresponds to an AA sectional view in FIG.

FIG. 2 is a view taken in the direction of arrow B in FIG. 3;

FIG. 3 is a view taken in the direction of arrow C in FIG. 2;

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

FIG. 5 is a cross-sectional view showing a third embodiment of the present invention, showing a state where a cover on a timing gear side is removed.

FIG. 6 is a cross-sectional view of a main part of a fourth embodiment of the present invention, showing a state where a cover on a timing gear side is removed.

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

[Explanation of symbols]

 1, 115, 123 Supercharger (fluid machine) 7, 47 Rotor shaft 13, 15 Rotor 17 Timing gear set 19 Casing body (casing) 21, 119 Cover 31 Casing body wall 33 Gear chamber 35, 117 Overhang 63 , 65 Bearing boss 101 Inlet (inlet) 103 Outlet (outlet) 107 Tapered screw hole (opening for oil plug) 109, 121 Joint surface of overhang portion 111, 113 End surface of boss portion 125 Screw hole (Opening for air breather) 127 Air breather

Claims (4)

[Claims] 1. A casing having a pair of rotors meshing with each other, a casing including the rotors, and having a fluid inlet and a fluid outlet, a cover fixed in an axial direction of the casing, a casing wall and a cover. A gear chamber formed between the gear chamber, an oil sump provided in the gear chamber, and a gear set housed in the gear chamber and rotating in conjunction with the rotor via a rotor shaft passing through a wall of the casing. Wherein the casing has an overhang portion having a joint surface with the cover, and the overhang portion has an opening for attaching an oil plug. 2. The timing gear set according to claim 1, wherein the gear set includes a pair of timing gears respectively connected to the rotor shafts, and synchronously rotates both rotors so as not to contact each other. A fluid machine characterized by the following. 3. The invention according to claim 1, wherein the boss portion for supporting the bearing of the rotor shaft is formed so as to protrude from the wall of the casing toward the gear chamber.
A fluid machine, wherein an axial height of the joint surface of the overhang portion is equal to or higher than an axial height of each of the boss portions. 4. The invention according to claim 1, wherein the overhang portion is provided with an opening for attaching an air breather for keeping the internal pressure of the gear chamber constant and preventing oil from being blown out. A fluid machine characterized by the above.