JPH09324775A - Fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform precise positioning in the rotational direction of timing gears. SOLUTION: A fluid machine is provided with rotors 13 and 15, a casing 11, a timing gear set 17 composed of timing gears 55 and 57 and a rotational directional positioning mechanism 59 to fix a rotor shaft 7 of the rotor 13 and the timing gear 55, and this positioning mechanism 59 is composed of a recessed part 61 formed up to a press-in part 69 having a shaft directional depth corresponding to an installing place of the timing gear 55 from an end surface of the rotor shaft 7, a press-in member 63 and a press-in means 65 to position the timing gear 55 in the rotational direction by pressing the rotor shaft 7 against the timing gear 55 by pressing the press-in member 63 in the press-in part 69.

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 In a fluid machine in which rotors are engaged with each other, such as a screw type or a roots type, in which it is not desired to bring the rotors into contact with each other, the respective rotors are synchronously rotated using a timing gear.

The timing gears are fixed to the respective rotor shafts while positioning the rotors in the rotational direction while meshing the rotors so that they do not contact each other. At this time,
The gap between the rotors needs to be uniform on the rotational direction side and on the opposite side, and for that purpose, the backlash between the timing gears must also be adjusted to a predetermined value. Therefore, it is necessary to position the timing gear with respect to the rotor shaft in the rotational direction with extremely high precision.

Conventionally, there is a method in which the timing gear and the rotor shaft are fixed by shrink fitting, or by using a spline or a key. However, since these methods do not have a fine adjustment function for positioning, the positioning of the timing gear is precisely performed. Is difficult to do.

There is also a method in which the timing gear is divided into a boss portion and a gear portion, and after the positions of the gear portions are aligned, the boss portion and the gear portion are bolted, but in this case, the boss portion and the gear portion are Due to the eccentricity, the rotor is likely to come into contact with each other, and such a divided structure is disadvantageous in that the cost is high and a large torque cannot be transmitted.

In addition, in Japanese Utility Model Publication No. 7-467883, FIG.
Such a fixing structure of the timing gear 201 is described.

This is because a bush 205 having a tapered shape is provided between the timing gear 201 and the rotor shaft 203.
7 and push the timing gear 201 into the rotor shaft 203.
It is fixed to.

[0008]

However, in the conventional example shown in FIG. 4, the timing gear 2 is used when the nut 207 is screwed in.
01 is easy to rotate together, and it is meaningless to precisely adjust the phase (rotational direction position) of the timing gear 201 in advance. When the phase of the timing gear 201 is deviated, meshing noise is generated in the timing gear set, and contact and seizure between rotors, performance deterioration, noise, vibration, and the like occur.

In order to prevent this, when the nut 207 is screwed in, the timing gear 201 must be fixed so as not to rotate. For that purpose, a jig for fixing the timing gear 201 is required, and the work is required. It becomes complicated.

Therefore, an object of the present invention is to provide a fluid machine capable of precisely positioning the timing gear in the rotational direction with respect to the rotor shaft by an easy work.

[0011]

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 a casing having a fluid inlet and a fluid outlet. A timing gear set including a pair of timing gears that meshes the rotors so that they do not contact each other, and a rotational direction positioning mechanism that positions the timing gears in the rotational direction with respect to the shaft of the rotor. A recess having an opening on the end face of the rotor shaft and having a portion corresponding to the mounting location of the timing gear as the press-fitting portion, a press-fitting member having an outer dimension larger than the inner dimension of the press-fitting portion, and the press-fitting member being press-fitted into the press-fitting portion. And a press-fitting means for pressing the rotor shaft against the timing gear to position the timing gear in the rotational direction.

As described above, in the fluid machine according to the first aspect, the recess is provided at the end of the rotor shaft, and the press-fitting member is press-fitted into the press-fitting portion provided at the radially inner position of the timing gear of the recess. Press the rotor shaft against the timing gear to position the timing gear in the rotational direction. Prior to this positioning, the timing gear is precisely aligned in the rotational direction.

As described above, in this rotational direction positioning mechanism in which the press-fitting member is press-fitted into the recess of the rotor shaft, no force is applied to the timing gear during positioning, so the bush 2
05 (press-fitting member) to the timing gear 201 and the rotor shaft 2
Unlike the conventional example in which it is press-fitted in the position No. 03, the phase of the timing gear does not deviate during positioning.

Since the timing gear can be precisely positioned in the rotational direction in this manner, meshing noise of the timing gear set, contact and seizure between rotors, performance deterioration, noise, vibration, etc. are prevented.

Further, the positioning work is easy.

The invention according to claim 2 is the fluid machine according to claim 1, characterized in that the axial cross-sectional shape of the press-fitting portion is a taper shape that narrows from the opening side toward the back side. An effect equivalent to that of the first aspect is obtained.

In addition to this, since the press-fitting portion is tapered, the press-fitting member can be easily press-fitted with a small press-in force, and a large fixing force can be obtained with a small press-in force, so that the timing gear can be securely attached. Can be fixed and positioned.

The invention according to claim 3 is the fluid machine according to claim 2, characterized in that the press-fitting member is a taper member having the same taper angle as the press-fitting portion.
The same effect as that of the configuration is obtained.

In addition to this, since the taper angle of the taper member, which is the press-fitting member, is the same as that of the press-fitting portion, a large fixing force can be obtained with a smaller pressure input.

According to a fourth aspect of the present invention, in the fluid machine according to the first aspect, the press-fitting portion has a cylindrical shape, and an effect equivalent to that of the configuration of the first aspect is obtained.

In addition to this, the cylindrical press-fitting portion is easy to process, and the cost is accordingly low.

The invention according to claim 5 is the fluid machine according to any one of claim 1, claim 2 or claim 4, characterized in that the press-fitting member is a ball. It is possible to obtain the same effect as that of the first or second aspect or the fourth aspect.

In addition to this, the ball is inexpensive, and when press-fitting, it is not necessary to consider the directionality with respect to the press-fitting portion, and the press-fitting operation is that much easier.

The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the press-fitting means is a ring shape with a part cut away, and the inner circumference of the recess is Is a spring member that is mounted in the recess by pressing. Thus, effects equivalent to those of the configurations of claims 1 to 5 are obtained.

The press-fitting of the press-fitting member is performed by pressing the press-fitting member placed in the recess with a ring-shaped spring member to press-fit the press-fitting member into the press-fitting portion, and the spring member is attached to the opening side of the recess by spring force. Prevent the press-fitting member from falling off.

Since the press-fitting means is a ring-shaped spring member as described above, the press-fitting member can be press-fitted without applying a rotational force to the rotor shaft. large. .

The invention according to claim 7 is the fluid machine according to any one of claims 1 to 5, wherein the press-fitting means is a screw member screwed into the recess. The same effects as those of the first to fifth aspects are obtained.

In addition to this, since the press-fitting means is a screw member, the press-fitting member can be press-fitted into the press-fitting portion with a slight rotational force, so that the press-fitting operation is easy.

When the screw member is screwed in, if the end of the rotor shaft, for example, on the opposite side is prevented from rotating, the screw member can be screwed in without impairing the rotational position of the adjusted timing gear. You can

The invention according to claim 8 is the fluid machine according to claim 7, wherein the screw member of the press-fitting means is integrated with the press-fitting member, and an effect equivalent to that of the structure of claim 7 is obtained. .

In addition to this, since the screw member of the press-fitting means is integrated with the press-fitting member, the press-fitting member can be easily removed, and the timing gear set is disassembled and the timing gear is replaced without destroying the related members. It becomes possible to be advantageous.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIG. This embodiment has the features of claims 1, 2, 5, and 6. 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. In addition, members and the like without reference numerals are not shown.

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

The input pulley 3 is spline-connected to the rotor shaft 7 on the input side and fixed by a nut 9. 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 comprises a compressor casing 11 (casing), rotors 13 and 15 having a cocoon-shaped cross section arranged therein, a timing gear set 17, and the like.

The compressor casing 11 is constructed by fixing a cover 21 to a casing body 19 with bolts 23, and the timing gear set 17 includes a casing body 19.
And the cover 21.

One rotor 13 is constructed by spline connecting the input side rotor shaft 7 to the shaft hole 27 of the rotor body 25, and the other rotor 15 is composed of the shaft hole 31 of the rotor body 29.
And a rotor shaft 33 is spline-connected.
Each rotor body 25, 29 has a projection 35 meshing with each other,
37, and these convex portions 35, 37 are formed with axial cavities 39, 41 to reduce the moment of inertia.

The rotor shafts 7 and 33 are connected to the rotor body 25,
The left side of 29 is supported by the compressor casing 11 by seal type ball bearings 43 and 45, and the right side of the rotor bodies 25 and 29 is supported by the compressor casing 11 by ball bearings 47 and 49. Further, seals 51 and 53 are arranged between the rotor shafts 7 and 33 and the casing 11 on the right end side.

The seal type ball bearings 43 and 45 and the seals 51 and 53 prevent air and oil from leaking to the outside of the casing 11.

The timing gear set 17 is composed of a pair of timing gears 55 and 57 meshed with each other. The timing gear 55 is fixed to the right end side of the rotor shaft 7 by the rotational direction positioning mechanism 59, and the timing gear 57 is fixed to the rotor shaft 33. Pressed into the right end.

The rotational direction positioning mechanism 59 is used for the rotor shaft 7
And a ball 63 (press-fitting member), a ring-shaped spring member 65 (press-fitting means), and the like.

The concave portion 61 is formed in a taper shape that narrows from the opening toward the inner portion, and the axial position corresponding to the boss portion 67 of the timing gear 55 is the press-fitting portion 69. The diameter of the ball 63 is larger than that of the press-fitting portion 69.

The spring member 65 is provided with a notch 71. When the spring member 65 is pushed into the recess 61 with the ball 63 placed in the recess 61, the ball 63 is pushed into the press-fitting portion 6.
While being press-fitted into the spring 9, the spring member 65 is fixed to the opening side of the recess 61 by the spring force to prevent the balls 63 from falling off.

When the ball 63 is pressed into the press-fitting portion 69,
The rotor shaft 7 is pressed against the boss 67 of the timing gear 55 to position the timing gear 55 in the rotational direction.

To position the timing gear 55 in the rotational direction, the rotors 13 and 15 are first meshed with each other so that the gaps formed between the rotors 13 and 15 in the rotational direction and on the opposite side are uniform, and then the timing gear 55 is rotated. The gear 55 is engaged with the timing gear 57.

The engine driving force input from the pulley 3 drives the compressor 5 to rotate, and the rotors 13 and 15 send the intake air sucked from the suction port of the casing 11 to the discharge port.
It is discharged from the discharge port 73 and supplied to the engine.

Thus, the supercharger 1 is constructed.

In the supercharger 1, as described above, the timing gear 55 is positioned by applying a force in the axial direction and press-fitting the ball 63, so that no force is applied to the timing gear 55, particularly a rotational force, in positioning. .

Therefore, unlike the case where the bush is press-fitted between the timing gear and the rotor shaft as in the conventional example, the phase of the timing gear 55, which has been preliminarily aligned in the precise rotation direction, may be misaligned during positioning. Absent.

In this way, meshing noise of the timing gear set 17, contact and seizure of the rotors 13 and 15, deterioration of performance of the compressor 5, noise, vibration, etc. are prevented.

Further, the positioning work is easy.

Further, since the press-fitting portion 69 is tapered, the ball 63 can be press-fitted with a small press-fitting force, and
Timing gear 5 can obtain a large fixed force with a small pressure input.
5 can be firmly fixed and positioned.

Further, the ball 63 is inexpensive, and it is not necessary to consider the directionality with respect to the press-fitting portion 69 at the time of press-fitting.
Press-fitting work is that much easier.

Further, the press-fitting means is a ring-shaped spring member 65.
By doing so, the ball 63 can be press-fitted without applying a rotational force to the rotor shaft 7, so that the effect of preventing the phase shift of the timing gear 55 is particularly great.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has the features of claims 1, 2, 3, and 7. FIG. 2 shows a portion in which the timing gear set 17 of the supercharger 75 (fluid machine) of this embodiment is arranged. 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.

In this supercharger 75, the timing gear 55 positioned by the rotation direction positioning mechanism 59 in the supercharger 1 of the first embodiment is positioned by the rotation direction positioning mechanism 77. Therefore, the members having the same functions as those of the supercharger 1 are given the same reference numerals, and the duplicate description of these members having the same functions is omitted.

The rotation direction positioning mechanism 77 is provided for the rotor shaft 7
And a taper member 81 (press-fitting member), a bolt 83 (press-fitting means), and the like.

A tapered press-fitting portion 85 is formed in the recess 79 at an axial position corresponding to the boss portion 67 of the timing gear 55, and the taper member 81 has a press-fitting portion. It has the same taper angle as 85. Further, the bolt 83 has a square hole 87 for a wrench, and a screw portion 89 provided on the opening side of the recess 81.
Is screwed on.

In positioning the timing gear 55 in the rotational direction, first, the rotors 13 and 15 are meshed with each other so that the rotational direction formed between the rotors 13 and 15 and the gap on the opposite side are uniform, and then the timing gear 55 is positioned. The timing gear 57
While engaging with the precision alignment,
The taper member 81 put in No. 9 is press-fitted into the press-fitting portion 85 by tightening the bolt 83.

When the bolts 83 are screwed in, if the rotor shaft 7 is prevented from rotating by using a spline that connects the input pulley 3 to the left end side of the rotor shaft 7, it is possible to adjust the position of the adjusted timing gear 55 in the rotational direction. The bolt 83 can be screwed in without damaging the bolt.

When the taper member 81 is press-fitted into the press-fitting portion 85, the rotor shaft 7 is pressed against the boss portion 67 of the timing gear 55 and the timing gear 55 is positioned in the rotational direction.

Thus, the supercharger 75 is constructed.

In the supercharger 75, the timing gear 55 is positioned by press-fitting the taper member 81 into the press-fitting portion 85 of the rotor shaft 7 as described above. Therefore, no force is applied to the timing gear 55 in positioning, The phase is not changed.

Therefore, the meshing sound of the timing gear set 17, contact and seizure of the rotors 13 and 15, deterioration of the performance of the compressor 5, noise, vibration, etc. are prevented.

Further, the positioning work is easy.

Further, since the press-fitting portion 85 has a tapered shape, the taper member 81 can be easily press-fitted with a small press-in force, and a large fixing force can be obtained with a small press-in force to firmly fix the timing gear 55. Can be positioned.

Further, since the taper angle of the taper member 81 is the same as that of the press-fitting portion 85, a large fixing force can be obtained with a smaller press-in force.

In addition, since the press-fitting means is the bolt 83, the taper member 81 can be press-fitted into the press-fitting portion 85 with a slight rotational force.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment has the features of claims 1, 4, 5, and 7. FIG. 3 shows a portion where the timing gear set 17 of the supercharger 91 (fluid machine) of this embodiment is arranged. The left and right directions are the left and right directions in FIG. 3, and members and the like without reference numerals are not shown.

In this supercharger 91, the timing gear 55 positioned by the rotation direction positioning mechanisms 59 and 77 in the superchargers 1 and 75 of each of the above embodiments is positioned by the rotation direction positioning mechanism 93. Therefore, the members having the same functions as those of the superchargers 1 and 75 are given the same reference numerals, and the duplicate description of these members having the same functions is omitted.

The rotational direction positioning mechanism 93 is used for the rotor shaft 7
And a ball 63 (press-fitting member), a bolt 83 (press-fitting means), and the like.

A cylindrical press-fitting portion 97 is formed in the recess 95 at an axial position corresponding to the boss portion 67 of the timing gear 55. The outer diameter a of the ball 63 is the inner diameter b of the press-fitting portion 97.
Greater than. Further, a screw portion 99 to which the bolt 83 is screwed is provided on the opening side of the recess 95. The inner diameter b of the press-fitting portion 97 is smaller than the inner diameter of the screw portion 99, and the screw portion 99 and the press-fitting portion 97 have a stepped shape.

The positioning of the timing gear 55 in the rotational direction is performed by first meshing the rotors 13 and 15 so that the rotational direction formed between them and the gap on the opposite side are uniform, and then the timing gear 55. The timing gear 57
With the precise alignment by engaging with
The ball 63 put in 5 is tightened with the bolt 83 and the press-fitting portion 97
Press into.

When the ball 63 is press-fitted into the press-fitting portion 97,
The rotor shaft 7 is pressed against the boss 67 of the timing gear 55 to position the timing gear 55 in the rotational direction.

Thus, the supercharger 91 is constructed.

In the supercharger 91, since the timing gear 55 is positioned by pressing the ball 63 into the press-fitting portion 97 of the rotor shaft 7 as described above, no force is applied to the timing gear 55 during positioning, and The phase is not changed.

Therefore, the meshing sound of the timing gear set 17, contact and seizure of the rotors 13 and 15, deterioration of the performance of the compressor 5, noise, vibration, etc. are prevented.

Further, the positioning work is easy.

Further, the ball 63 does not need to be considered in the directionality with respect to the press-fitting portion 97 at the time of press-fitting, and the press-fitting work is easy.

Further, the cylindrical press-fitting portion 97 is easy to process, and the cost is accordingly low.

Further, by using the bolt 83 as the press-fitting means, the ball 63 can be press-fitted into the press-fitting portion 97 with a slight rotational force.

The fluid machine of the present invention may use a screw rotor, and not only a compressor or a blower that converts rotation into a fluid pressure but also a motor that applies fluid pressure to take out rotation. You may use as.

[0084]

In the fluid machine according to the first aspect of the present invention, the timing gear is positioned by press-fitting the press-fitting member into the press-fitting portion of the rotor shaft. Therefore, unlike the conventional example, a force is applied to the timing gear during positioning. It does not take and the phase does not go wrong.

Therefore, the meshing noise of the timing gear set, the contact and seizure of the rotors with each other, the performance deterioration, the noise, the vibration, etc. are prevented.

Further, the positioning work is easy.

According to the second aspect of the present invention, the same effect as that of the first aspect is obtained, and since the press-fitting portion is tapered, the press-fitting member can be easily press-fitted with a small press-fitting force. Since a large fixing force can be obtained with a small pressure input, the timing gear can be firmly fixed and positioned.

According to the third aspect of the present invention, the same effect as that of the second aspect is obtained, and since the taper angle of the press-fitting member is the same as that of the press-fitting portion, a large fixing force can be obtained with a smaller press-in force.

The invention according to claim 4 obtains the same effect as that of the structure according to claim 1, and the cylindrical press-fitting portion is easy to process, and the cost is correspondingly low.

According to the fifth aspect of the present invention, the same effect as that of the first, second or fourth aspect is obtained, and it is not necessary to consider the directionality of the ball with respect to the press-fitting portion at the time of press-fitting. It's easy.

According to the sixth aspect of the present invention, the same effects as those of the first to fifth aspects are obtained, and the press-fitting means is a ring-shaped spring member, so that the rotor shaft is not subjected to a rotational force. Since the press-fitting member can be press-fitted, the effect of preventing the rotational displacement of the timing gear is particularly great. .

The invention according to claim 7 obtains the same effect as that of the structure according to claims 1 to 5, and the press-fitting means is a screw member, so that the press-fitting member is press-fitted into the press-fitting portion with a slight rotational force. it can.

According to the eighth aspect of the present invention, the same effect as that of the seventh aspect is obtained, and the screw member of the press-fitting means is integrated with the press-fitting member. This is advantageous because the timing gear set can be disassembled and the timing gear can be replaced without destroying the.

[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 showing a second embodiment of the present invention.

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

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

1, 75, 91 Supercharger (fluid machine) 7, 33 Rotor shaft 11 Compressor casing (casing) 13, 15 Rotor 17 Timing gear set 55, 57 Timing gear 59, 77, 93 Timing gear rotational direction positioning mechanism 61, 79 , 95 concave portion 63 ball (press-fitting member) 65 ring-shaped spring member (press-fitting means) 69, 85, 97 press-fitting portion 81 taper member (press-fitting member) 83 bolt (press-fitting means)

Claims (8)

[Claims] 1. A casing having a pair of rotors meshing with each other, a rotor rotatably enclosing the rotors, and a fluid inlet and a fluid outlet, and a pair of timing gears meshing the rotors so as not to contact each other. And a rotational direction positioning mechanism for positioning the timing gear in the rotational direction with respect to the rotor shaft, the rotational direction positioning mechanism having an opening on the end face of the rotor shaft and mounting the timing gear. A recess having a portion corresponding to the location as the press-fitting portion, a press-fitting member whose outer dimension is larger than the inner dimension of this press-fitting portion, and this press-fitting member that is press-fitted into the press-fitting portion and presses the rotor shaft against the timing gear to rotate the timing gear A fluid machine characterized by comprising a press-fitting means for positioning at. 2. The fluid machine according to claim 1, wherein the axial cross-sectional shape of the press-fitting portion is a tapered shape that narrows from the opening side toward the back side. 3. The fluid machine according to claim 2, wherein the press-fitting member is a taper member having the same taper angle as the press-fitting portion. 4. The fluid machine according to claim 1, wherein the press-fitting portion has a cylindrical shape. 5. The fluid machine according to claim 1, 2, or 4, wherein the press-fitting member is a ball. 6. The invention according to any one of claims 1 to 5, wherein the press-fitting means has a ring shape with a part cut away, and presses the inner circumference of the recess to form the recess. A fluid machine, which is a spring member to be mounted. 7. The fluid machine according to any one of claims 1 to 5, wherein the press-fitting means is a screw member screwed into the recess. 8. The fluid machine according to claim 7, wherein the screw member of the press-fitting means is integral with the press-fitting member.