JP3373286B2 - compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art FIG.
Such a mechanical supercharger 201 is described. In this system, a pair of convex and concave screw rotors 207 and 209 are rotationally driven by the driving force of the engine via the speed increasing gear set 203 and the timing gear set 205 to pressurize intake air and supercharge the engine. Between each rotor 207 and 209 and 2
A predetermined clearance is required between the end faces of 07 and 209 and the caging 211.

[0003]

The clearance adjustment is performed by adjusting the shaft 213 of the screw rotor 209 and the timing gear 2.
This is performed by relatively rotating 15 and 15, and at that time, using a gap gauge 217 as shown in FIG.
9, 221, the clearance between the drive side and the driven side of the rotors 207 and 209 is adjusted to a predetermined value, and further, the rotor 2 is separated by the suction side and the discharge side as indicated by arrows 223 and 225.
The bolt 227 is tightened to fix the shaft 213 and the timing gear 215 in a state where the clearance between the end faces of 07 and 209 and the caging 211 is adjusted to a predetermined value, and then the leveling operation is performed.

As described above, the clearance adjusting operation is very troublesome and the productivity is poor, and moreover, the clearance varies widely.

Therefore, an object of the present invention is to provide a compressor in which the clearance can be easily adjusted and the variation is small.

[0006]

A compressor according to a first aspect of the present invention is a gas which is driven to rotate synchronously via a casing having an inlet and an outlet and a timing gear set arranged inside the casing and sucked from the inlet. And a pair of rotors for sending the compressed air to the discharge port, and the clearances between the rotors and between the rotor end surface and the casing when attached to the pair of rotors are kept at a predetermined value, and the compression heat of the intake air after assembly is maintained. Predetermined thickness that is melted by and discharged to the outside from the discharge port
And a spacer set to .

A compressor according to a second aspect of the present invention is the compressor according to the first aspect, characterized in that the pair of rotors are cocoon-shaped cross-section rotors.

A compressor according to a third aspect of the present invention is the compressor according to the first aspect, characterized in that the pair of rotors are a screw rotor of a convex type and a concave type.

The compressor of the fourth invention is the compressor of claims 1 and 2.
Alternatively, the compressor according to the third aspect is characterized in that the intake air is pressure-fed to supercharge the engine, and the spacer is melted by the compression heat of the intake air.

The compressor of the fifth aspect of the present invention is the compressor according to the first aspect.
The compressor according to any one of items 2, 3, and 4, wherein the spacer is a polyethylene tape.

[0011]

When the compressor is assembled, the spacers arranged between the rotors or between the rotor end face and the caging provide a predetermined clearance. As a result, the spacer is melted and discharged to the outside. As described above, the clearance adjustment is extremely simple and has little variation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. As described below, the compressor of this embodiment is the screw type described in claim 3, and
It is used as a supercharger for engines as described in. Hereinafter, the left and right directions are the left and right directions in FIG.
Members and the like not given reference numerals are not shown.

FIG. 1 shows a supercharger 1. The supercharger 1 includes an electromagnetic clutch 3, a speed increasing gear set 5, a timing gear set 7, and a screw type air compressor 9 (compressors of the third, fourth and fifth inventions).
Is equipped with.

The electromagnetic clutch 3 includes a pulley 11, an electromagnetic coil 13, an armature 15 and the like. Pulley 11
Is the boss 21 of the casing 19 through the bearing 17.
It is supported on the outer circumference. This pulley 11 is connected to a crankshaft side pulley via a belt and is rotationally driven by the driving force of the engine.

A flange member 25 is fixed to the input shaft 23 of the speed increasing gear set 5 with bolts 27, and the armature 15
Is connected to this flange member 25 via a leaf spring 29. When the electromagnetic coil 13 is excited, the armature 15 is attracted and pressed against the pulley 11, and the driving force of the engine causes the input shaft 23 to rotate. Further, when the excitation is stopped, the armature 15 is separated from the pulley 11 by the leaf spring 29, and the driving force of the engine is cut off.

The air compressor comprises convex and concave screw rotors 31 and 33, as shown in FIG. 2, and a casing 35. The convex rotor 31 has four convex portions 37, and the concave rotor 33 has six concave portions 39. The convex rotor 37 and the concave portion 39 mesh with each other through a predetermined clearance as shown in FIG. is doing. The casing 35 is provided with an intake port and an exhaust port on the right end side and the left end side, respectively, and an intake passage is connected to the intake port via an air filter, and the exhaust port is connected to the intake manifold side of the engine. .

Rotor shafts 41 and 43 are integrally formed at the left and right ends of the rotors 31 and 33, respectively, and the left end side shafts 41 and 43 are respectively formed.
Through the bearings 45, 45, and each shaft 4 on the right end side
1, 43 are casings 3 via bearings 47, 47
It is supported by 5. Bearing 45 and each shaft 41, 43
Clearance adjustment shims 49 and 51 are arranged between
Seals 53 and 55 for preventing air leakage are arranged between the shafts 41 and 43 and the casing 35.

The speed increasing gear set 5 is composed of a large diameter small speed increasing gear 5 and a small diameter increasing speed gear 5.
7, 59, and the timing gear set 7 is composed of large-diameter and small-diameter timing gears 61, 63. The casings 19 and 35 are integrally fixed with bolts 65, and the gear sets 5 and 7 are housed in them.

The speed increasing gear 59 and the timing gear 63 are fixed to the left end portion of the rotor shaft 41 by a key 67 and a bolt 69. A hub 71 is fixed to the left end of the rotor shaft 43, and the speed increasing gear 57 is integrally formed on the right end of the input shaft 23 and is supported by the outer periphery of the hub 71 via a bearing 73.

The timing gear 61 is fixed to the hub 71 with bolts 75 and 75. One of the holes for the bolts 75 provided in the hub 71 and the gear 61 is a long hole in the circumferential direction. As described below, the timing gear is maintained with the clearance between the rotors 31 and 33 kept at a predetermined value. 61,
63 meshes can be performed.

The driving force of the engine input from the electromagnetic clutch 3 to the input shaft 23 is increased through the speed increasing gear set 5, and is input from the timing gear 63 to the timing gear set 7 to form the projections 37 and the recesses 39. The convex rotor 31 is rotated at a higher speed than the concave rotor 33 by a ratio of the numbers, and they are synchronously rotated in the opposite direction. The air compressor 9 pumps intake air and supplies it to the engine.

The clearance of each part of the air compressor 9 is adjusted as follows. When assembling the air compressor 9, the space between the rotors 31, 33 and the rotors 31, 33
Spacers 77, 79, 81, 83, 85 as shown in FIGS. 2 and 3 are arranged between the end surface of the casing and the casing 35. As shown in FIG. 3, the spacers 77 and 79 are arranged on the rotation direction side and the counter rotation direction side between the rotors 31 and 33, respectively. The spacer 77 on the rotation direction side has a thickness of about 0.2 mm.
In addition, the spacer 79 on the side opposite to the rotation direction has a thickness of about 0.1 m.
It is set to m. Further, the thickness of the spacers 81, 83, 85 is about 0.1 mm, and the spacer 81 is composed of the rotors 31, 33.
It is also arranged between the end surface of the casing and the casing 35.

As described above, the thickness of the clearance adjusting shims 49 and 51 is adjusted while the spacers that keep the clearances of the respective parts at the predetermined values are attached, and the speed increasing gear 59 is adjusted.
The timing gear 63 is fixed to the rotor shaft 41 with the key 67 and the bolt 69. After that, the timing gear 61 meshes with the timing gear 63, and these are fixed with bolts 75.

Each spacer is a polyethylene tape. Since polyethylene is decomposed into water and carbon dioxide when heated, when the air compressor 9 operates, it is decomposed by the compression heat of intake air and discharged from the discharge port, leaving a clearance of a predetermined value.

Each spacer has the following characteristics depending on its shape and mounting direction.

The spacer 77 is a long tape-like member which is mounted in the tooth width direction of the rotors 31 and 33 so as to easily obtain a uniform clearance in the tooth width direction. The spacer 79 has a strip shape shorter than the spacer 77,
Is a dot shape. When they are arranged in the tooth width direction, the clearances can be made uniform in the tooth width direction if they have the same thickness, and if the parts having different thicknesses are arranged, it is possible to cope with the thermal expansion of the rotors 31 and 33 in each part. Different clearances are obtained. Further, the spacer 81 having a small area is used for the rotor 31,
It can be arranged at the end of 33.

The spacer 83 is the arm 8 along the tooth width and tooth height.
Since it has 7, 89 and can be mounted evenly along the tooth surface, the clearance can be adjusted in two directions of the tooth width and tooth height.
The spacer 85 is arranged slenderly in the rotation direction of the tooth surfaces of the rotors 31 and 33, and the clearance in the tooth contact direction during rotation can be adjusted.

Further, the spacer may have a partially changed thickness. The spacer 91 shown in FIG. 4 is an example thereof, and the thickness is changed from t ₁ to t _2, and the rotors 31, 33 are
Corresponds to the tooth surface shape and contact. This type of spacer may have a varying thickness in a curved manner.

The material of the spacer is synthetic resin, synthetic rubber or the like, and any material can be used as long as it is melted and discharged by heat and does not harm the equipment on the discharge side. Such synthetic resins include, for example, polyethylene, polyester, vinyl chloride, styrene, epoxy, acrylic, nylon and the like.

By using such a heat-soluble spacer, it is possible to insert the spacer and assemble with each part kept at a predetermined clearance, so that the clearance adjustment becomes extremely easy and the clearance There is little variation.

In addition to the screw type rotor, the rotor may have a cocoon type cross section. The second invention is a roots type compressor using this eyebrows type rotor.

If the heat of compression of the gas is insufficient for melting the spacer, the gas that has been appropriately heated in advance may be used as the intake air to raise the temperature of the pressure-fed gas. Further, the spacer may be formed by widely coating the required portion of the rotor.

[0033]

According to the compressor of the present invention, spacers which are melted and discharged upon receiving the compression heat of gas are arranged between the rotors or between the rotor end surface and the casing, so that the clearances of the respective parts are maintained at predetermined values. Since it can be attached, clearance adjustment is extremely easy and there is little variation in clearance.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a rotor used in the embodiment of FIG.

FIG. 3 is an enlarged arrow view of the rotor of FIG. 2 in the X direction.

FIG. 4 is a sectional view of a spacer used in an example.

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

FIG. 6 is a view showing a gap gauge used for conventional clearance adjustment.

[Explanation of symbols] 7 Timing gear set 9 Air compressor (compressor) 31 Convex screw rotor 33 Concave screw rotor 35 casing 77, 79, 81, 83, 85, 91 Spacer

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F04C 29/00 F04C 18/16 F04C 18/18

Claims (5)

(57) [Claims] 1. A casing having an intake port and an exhaust port, and a pair of rotors that are driven to rotate synchronously via a timing gear set disposed inside the casing and that pumps gas sucked from the intake port to the exhaust port. Attached to this pair of rotors
It is maintained in a predetermined value the clearance between the rotor and between the rotor end surface and the casing during assembly, and a spacer which is set to a predetermined thickness which is dissolved by the compression heat of the intake air is discharged from the discharge port to the outside after assembly A compressor characterized by that. 2. The compressor according to claim 1, wherein the pair of rotors are cocoon-shaped rotors. 3. The compressor according to claim 1, wherein the pair of rotors is a screw rotor of a convex type and a concave type. 4. The compressor according to claim 1, wherein the intake air is pressure-fed to supercharge the engine, and the spacer is melted by the compression heat of the supply air. 5. The compressor according to claim 1, 2, 3 or 4, wherein the spacer is a polyethylene tape.