JP2003254275A - Compressor mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of noise by preventing a large vibration of a mounting bracket for a compressor under a vibration of the compressor. <P>SOLUTION: An elliptic cylinder 40 and a rotor 50 having a plurality of vanes 58 and rotatable in the cylinder are housed in a compressor case 11, the cylinder is divided by the vanes into compression chambers 48, and discharge openings 42 are cut near a minor axis region of the cylinder. The compressor 10A is mounted on the mounting bracket 80 with blots 74 in mounting bosses 70 to 72 formed on the compressor case, and is mounted on an engine block 100 with other bolts. The cylinder 40 in the compressor case has a major axis direction L set at 66° to a mounting surface S for the mounting bracket, and a maximum vibration line MAX passing on the cylinder center and near the discharge openings, set substantially parallel to the mounting surface S. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor mounting structure used in a vehicle air conditioning system or the like.

[0002]

2. Description of the Related Art A compressor used for compressing a refrigerant in an air conditioner or the like is provided with a rotor having a plurality of vanes rotatably provided in a cylinder having a substantially elliptical inner peripheral surface arranged in a compressor case. Therefore, the space partitioned by the vanes forms a compression chamber in which the volume changes repeatedly, and the refrigerant gas sucked from the suction port to the compression chamber is compressed and discharged from the discharge port.

FIG. 5 is a longitudinal sectional view showing such a conventional gas compressor, and FIG. 6 is a view showing a cylinder and a rotor in a section AA in FIG. Note that FIG. 5 corresponds to a cross section taken along the line BB in FIG. One-end opening type housing 11a and front head 1 attached to the opening side thereof
A compressor case 11 is formed by 1b.
A cylinder 40 having a substantially elliptical inner circumference is disposed between the front side block 20 and the rear side block 30 in the housing 11a, and a rotor 50 including five vanes 58 is rotatably provided in the cylinder 40. ing.

The rotating shaft 51, which rotates integrally with the rotor 50,
The front end side extends through the front side block 20 from the lip seal 18 on the end wall of the compressor case to the outside of the front head 11b, and the rear end is the rear side block 30.
It is supported by a through support hole 32 provided in the. An electromagnetic clutch 25 having a pulley 24 is attached to the front end of the rotary shaft 51 so as to receive the rotational driving force from a crank pulley of an engine (not shown).

Slit-shaped vane grooves 56 are radially formed on the outer peripheral surface side of the rotor 50, and these vane grooves 56 are formed.
A vane 58 is attached to each. Vane 58
Is urged toward the inner peripheral surface of the cylinder 40 by the centrifugal force and the hydraulic pressure applied to the back pressure chamber 59 formed at the bottom of the vane groove 56 when the rotor 50 rotates. The inside of the cylinder 40 is partitioned into a plurality of small chambers by the rotor 50 and the vanes 58, and forms a compression chamber 48 in which the volume changes repeatedly as the rotor 50 rotates. Thereby, the vane rotary type compressor is formed.

A front suction chamber 13 having a refrigerant gas suction port 14 is formed between the front head 11b and the front side block 20. The front side block 20 includes a front suction chamber 13 and a compression chamber 48.
The suction port 22 that communicates with is opened.

The refrigerant gas flowing from the refrigerant gas suction port 14 into the front suction chamber 13 is sucked into the compression chamber 48 from the suction port 22 formed in the front side block 20. Further, the rear side block 3 is attached to the cylinder 40.
Communication hole 41 communicating with the rear side suction port 31 formed in 0
Are provided in the axial direction, and the refrigerant gas is also sucked into the compression chamber 48 from the front suction chamber 13 through the communication hole 41 and the rear suction port 31.

A discharge chamber 15 is formed between the closed side of the housing 11a and the rear side block 30 and has a refrigerant gas discharge port 16. Also the rear side block 3
A cyclone block 60 including an oil separator 62 is attached to the zero discharge chamber 15 side. The cyclone block 60 has a seal ring 64 sandwiched between the cyclone block 60 and the boss portion 38 of the rear side block 30 that supports the rear end of the rotary shaft 51, and the sealed space R.
Is formed.

A discharge chamber 44 is cut out in the outer peripheral portion in the vicinity of the short diameter portion of the cylinder 40 to form a thin portion, and a discharge port 42 is opened in this thin portion. The discharge port 42 is provided with a reed valve 43. The refrigerant gas discharged from the discharge port 42 is discharged from the discharge chamber 44 to the discharge chamber 15 via the oil separator 62. The suction port 22 and the discharge port 42 are provided symmetrically with respect to the rotation shaft 51 of the rotor 50 at two locations along the peripheral portion of the cylinder 40.

When the rotor 50 rotates, the refrigerant gas flowing into the refrigerant gas suction port 14 is cooled by the front suction chamber 13.
Is sucked into the compression chamber 48 through the suction port 22. Then, after being compressed in the compression chamber 48, it is discharged from the discharge port 42 provided in the vicinity of the short diameter part of the cylinder 40, and the refrigerant gas is supplied to the outside from the refrigerant gas discharge port 16 via the discharge chamber 15.

In such a gas compressor, the lubricating oil stored in the discharge chamber 15 is guided in order to lubricate the through hole 32 of the rotary shaft 51 and to supply the hydraulic pressure to the back pressure chamber 59 of the vane groove 56. It is like this. That is, in the conventional gas compressor, the rear side block 30 has the discharge chamber 15
An oil passage 33 that opens to the bottom of the rear side block 30 and reaches the side wall of the through support hole 32 is formed.
A recess (face) 35 and a small recess 37, which are arranged so as to communicate with 9, are provided.

The concave portion 35 has a constricted portion 35 when viewed from the front.
a, and the small recess 37 is arranged radially outward of the constricted portion 35a. The small recess 37 is the discharge port 4 of the cylinder 40.
2 is communicated with the back pressure chamber 59 of the vane groove 56 supporting the vane 58 passing through 2, and the recess 35 is associated with the back pressure chamber 59 of the vane groove 56 supporting the other plurality of vanes 58. There is.

The closed space R between the cyclone block 60 and the rear side block 30 and the recess 35 are connected by the communication passage 34, and the vicinity of the through support hole 32 of the oil passage 33 and the small recess 37 are connected by the communication passage 36. ing. The lubricating oil, which is pushed by the discharge pressure of the discharge chamber 15 and reaches the side wall of the through support hole 32 via the oil passage 33, passes through the gap between the through support hole 32 and the rotary shaft 51 to the recess 35 and the sealed space R. And also to the small recess 37 by the communication passage 36.

A through hole 46 connecting to the oil passage 33 of the rear side block 30 is provided at the bottom of the cylinder 40, and the oil passage 26 formed in the front side block 20.
The through hole 46 and the rotary shaft support portion 23 of the front side block 20 are connected to guide the lubricating oil to the support portion 23 and the concave portion 27 formed on the surface of the front side block 20 facing the rotor 50. ing.

FIG. 7 shows the appearance of the compressor having the above-mentioned structure. Mounting bosses 70, 7 are integrally formed on the compressor case 11 and are provided with through holes 73, respectively.
1, 72 are provided, and are attached and fixed to the engine block 100 (see FIG. 9) on the fixed side via a mounting bracket 80 which is a separate member as shown in FIG. The pulley 24 is operated by receiving the rotational driving force from the crank pulley of the engine.

FIG. 8 is a plan view of the mounting bracket 80, showing bosses 82, 83, 8 formed at three corners of a substantially square shape.
The boss 7 for mounting the compressor case 11 on each of 4
There is a compressor mounting hole 85 corresponding to each of the through holes 73 of 0, 71, 72, and the other one corner and boss 8
The four bosses 91, 92, 93, 94 formed at positions offset with respect to 2, 83, 84 have engine mounting holes 95, respectively. Each compressor mounting hole 8
5 is a screw hole. In the compressor 10, bolts 74 (see FIG. 9) inserted through the respective through holes 73 are screwed into the compressor mounting holes 85 and are coupled to the mounting bracket 80. Further, the mounting bracket 80 is fixed to the engine block 100 by screwing a bolt (not shown) passed through the engine mounting hole 95 into a screw hole (not shown) of the engine block 100.

FIG. 9 shows the compressor 10 at the mounting position with respect to the mounting bracket 80, and
It is the figure shown in the cross section of -C part. However, the bolt 74 is shown outside the through hole 73. The mounting bracket 80 has a general cross section of 4 mm and has a curved surface along the outer peripheral surface of the compressor case 11, and the engine block 100 is fitted with bolts (not shown) through the engine mounting holes 95.
Attached to the side wall of the compressor case 11
The inner cylinder 40 is attached to the mounting bracket 8 in the major axis direction L.
The mounting surface S to 0 (the end surfaces of the mounting bosses 70, 71, 72) is set to be substantially parallel to the mounting surface S.

[0018]

By the way, in a vehicle in which the compressor 10 is mounted on the engine block 100 via the mounting bracket 80 as described above, when the compressor 10 is operated for indoor air conditioning, conventionally,
There was a problem that abnormal noise was generated. As a result of examining the cause, it was found that the vibration accompanying the operation of the compressor was largely transmitted to the mounting bracket, and the mounting bracket vibrated violently.

This phenomenon is considered as follows. That is, during the operation of the compressor 10, periodic vibration is generated due to the compression work of the refrigerant gas as described above, but in the conventional compressor 10, the cylinder 40 has its major axis direction L moved to the mounting bracket 80. Since it is arranged in a direction substantially parallel to the mounting surface S of, the line connecting the two discharge ports 42, 42 provided in the vicinity of the short diameter is the mounting bracket 8
It is oriented laterally with respect to 0, in other words, with a large angle with respect to the mounting surface S. Then, since the high-pressure refrigerant compressed in the compression chamber 48 is discharged from the discharge ports 42, 42, the vibration of the compressor 10 due to repeated discharge passes through the center of the cylinder 40, and thus the two discharge ports 42, 42 described above. The maximum is the line direction connecting the neighborhood of.
Hereinafter, this line is referred to as the maximum vibration line MAX. Here, the maximum vibration line MAX is about 60 ° (about 30 ° from the vertical direction of the plate surface) with respect to the direction parallel to the mounting surface S.

On the other hand, the offset between the attachment point of the attachment bracket 80 to the engine block 100 and the attachment point of the compressor 10 is about 45 mm in the example of FIG. Therefore, the maximum compressor vibration is applied at about 30 ° from the vertical direction of the mounting surface S to the mounting bracket 80 in a state where the portion overhanging from the engine block connecting point is a cantilever. Due to this, a large vibration of the mounting bracket 80 due to this is transmitted from the engine through an engine mount (not shown). According to the vibration analysis experiment, the mounting bracket 80 is vibrating by being twisted at the cantilever portion, and in FIG.
The part and the lower boss 84 part were in the opposite phase mode.

FIG. 10 shows the total frequency (Over Al) in the cabin of a vehicle equipped with an engine having a displacement of 1300 cc.
The result of measuring the noise level of the fifth-order component of the compressor speed with respect to l) is shown.
It is considered that at ~ 3900 rpm, the sound of the fifth-order component is heard as an abnormal noise by the occupant.

Therefore, in view of the above-mentioned conventional problems, the present invention provides a compressor mounting structure in which abnormal noise is prevented by preventing the mounting bracket from being greatly vibrated by the vibration of the compressor, and a compressor suitable therefor. The purpose is to

[0023]

For this reason, the compressor mounting structure according to the first aspect of the present invention includes an elliptical cylinder and a rotor rotatably provided in the cylinder, the rotor including a plurality of vanes urged in the radial direction. The compressor is housed in a compressor case, and a compression chamber partitioned by a vane is formed in the cylinder, and a compressor with a discharge port near the minor diameter part of the cylinder is connected to a mounting bracket with a mounting boss provided in the compressor case. Then, the mounting bracket is mounted on the fixed side at a position different from the connecting portion of the mounting boss, and the cylinder has the maximum vibration line passing through the cylinder center and the vicinity of the discharge port in the compressor case. It is assumed to be substantially parallel to.

According to a second aspect of the present invention, the mounting bracket has a plate-like general cross section, and is provided with bosses each having a mounting hole in a connecting portion with a mounting boss of the compressor case and a mounting portion with a fixed side. I decided. In the invention of claim 3, since the maximum vibration line is substantially parallel to the mounting surface to the mounting bracket, the major axis direction of the cylinder is set to 41 ° to 90 ° with respect to the direction parallel to the mounting surface. I decided. Further, in claim 4, the major axis direction of the cylinder is set to 66 ° with respect to the direction parallel to the mounting surface.

According to a fifth aspect of the present invention, a compressor is provided with an elliptical cylinder, a rotor provided with a plurality of vanes that are urged in a radial direction and rotatably provided in the cylinder, and an attachment portion on the fixed side, and the cylinder. And a compressor case accommodating the rotor to form a compression chamber partitioned by a vane in the cylinder, and a discharge port is provided in the vicinity of the minor diameter part of the cylinder. The major axis direction is set to 41 ° to 90 ° with respect to the direction parallel to.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a diagram corresponding to FIG. 9 showing an embodiment. FIG. 2 is a side view showing a state in which the compressor is attached to the attachment bracket. First, the compressor 10A has the same mounting bracket 8 as shown in FIG.
It is attached and fixed to the engine block 100 via 0. The compressor case 11 is integrally formed with mounting boss portions 70, 71, 72, and the positions of the mounting boss portions correspond to the compressor mounting holes 85 of the mounting bracket 80.

A cylinder 40 and a rotor 50 arranged in the cylinder 40 are housed in the compressor case 11. Five vanes 58 are slidably mounted in the vane groove 56 of the rotor 50, and the inside of the cylinder 40 is partitioned into a plurality of small chambers to form a compression chamber 48 in which the volume changes repeatedly as the rotor 50 rotates. To do. The above configuration is similar to the conventional example.

In the present embodiment, the compressor case 1
The maximum vibration line MAX which connects the cylinder 40 in 1 to the vicinity of the two discharge ports 42, 42 is the mounting bracket 80.
The major axis direction L is inclined 66 ° from the direction parallel to the mounting surface S so as to be parallel to the mounting surface S. In this case, the two discharge ports 42, 42 are located on a line substantially parallel to the mounting surface S. In this respect, FIG.
Other than that shown in FIG. 5, the other configuration is the same as the above-mentioned conventional example.

The embodiment is configured as described above, and since the maximum vibration line MAX of the compressor 10A is parallel to the mounting surface S to the mounting bracket 80, the mounting bracket 80 in the cantilever state is bent in the bending direction. No large vibration is applied. Therefore, the mounting bracket 8
Since 0 does not cause violent vibration, generation of abnormal noise due to vibration of the mounting bracket 80 is prevented.

Although the maximum vibration line MAX is parallel to the mounting surface S in the above embodiment, the maximum vibration line MAX of the compressor is found to be the mounting bracket 80 when the limit of the tilt angle of the cylinder 40 is examined as a modification. It was found that it is effective in reducing abnormal noise and noise as long as it does not intersect with. However, the maximum vibration line MAX of the compressor slightly varies depending on the compressor operating conditions such as the rotation speed and the pressure condition. Therefore, as shown in FIG.
The major axis direction L of the cylinder 40 is preferably 41 ° to 90 °.

In FIG. 3A, the cylinder 40 is tilted so that the upper side of the maximum vibration line MAX passing through the discharge bracket 42 and passing through the mounting bracket 80 side is separated from the mounting bracket 80.
The case where the major axis direction L is 41 ° is shown. Also, (b)
Shows the case where the cylinder 40 is tilted in the direction in which the upper side of the maximum vibration line MAX passing through the discharge bracket 42 and passing through the mounting bracket 80 is brought closer to the mounting bracket 80, and the major axis direction L is set to 90 °.

FIG. 4 is a graph showing the noise level inside the vehicle in the present embodiment and the modification. This is the same as when the noise level in FIG. 10 was obtained, and the noise level of the fifth order component of the compressor rotation speed and the total frequency (Over All) in the vehicle cabin equipped with an engine having a displacement of 1300 cc was measured as outside air. It was measured at a temperature of 30 ° C. and a compressor rotation speed of 1900 to 4400 rpm, and the compressor discharge capacity was 96 cm ³ .
In comparison with the noise level of the conventional example indicated by the thin line, in the present embodiment including the modified example, the fifth-order component of the compressor rotation speed is attenuated by about 10 dB or more for all sounds (frequency), The sound that was remarkable as an abnormal sound was reduced to the extent that it could not be distinguished from other sounds.

[0033]

As described above, according to the present invention, the compressor is attached by being attached to the attachment bracket by the attachment boss portion provided on the compressor case, and the attachment bracket is fixed at a portion different from the attachment portion of the attachment boss. In the compressor case, the orientation of the cylinder was set so that the maximum vibration line passing through the center of the cylinder and the vicinity of the discharge port was approximately parallel to the mounting surface of the mounting bracket. Even if the mounting bracket attached to the fixed side at a different position from the above is in a cantilevered state, the vibration of the compressor does not largely act in the bending direction of the mounting bracket. Therefore, it is possible to prevent the generation of abnormal noise due to the intense vibration of the mounting bracket.

Since the vibration of the compressor does not greatly affect the direction in which the mounting bracket is bent, the vibration of the mounting bracket can be effectively suppressed even when the general cross section of the mounting bracket is plate-like, and abnormal noise can be prevented. Is very effective.

By setting the major axis direction of the cylinder at 41 ° to 90 ° with respect to the direction parallel to the mounting surface, the maximum vibration line can be made substantially parallel to the mounting surface on the mounting bracket. it can. When the major axis direction of the cylinder is set to 66 ° with respect to the direction parallel to the mounting surface, the maximum vibration line becomes parallel to the mounting surface to the mounting bracket, and the maximum vibration suppressing effect of the mounting bracket is obtained. , Abnormal noise is prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a diagram showing a modified example.

FIG. 4 is a diagram showing a noise level in the embodiment in comparison with a conventional example.

FIG. 5 is a vertical sectional view showing a conventional gas compressor.

6 is a cross-sectional view taken along the line AA in FIG.

FIG. 7 is an external side view of a conventional compressor.

FIG. 8 is a plan view showing a mounting bracket.

9 is a sectional view taken along line CC of FIG.

FIG. 10 is a diagram showing a noise level in a conventional example.

[Explanation of symbols]

10A, 10 compressor 11 compressor case 11a housing 11b front head 13 Front side suction chamber 14 Refrigerant gas intake port 15 Discharge chamber 16 Refrigerant gas discharge port 18 lip seal 20 front side blocks 22 Suction port 23 Rotating shaft support 24 pulley 25 electromagnetic clutch 26, 33 oil passage 30 rear side block 31 Rear inlet 32 Through support hole 34, 36 communication passage 35 recess 35a Constriction 37 Small recess 38 Boss 40 cylinders 41 Communication hole 42 outlet 43 Reed valve 44 Discharge chamber 46 through hole 48 compression chamber 50 rotor 51 rotation axis 56 vane groove 58 vanes 59 Back pressure chamber 60 cyclone block 62 oil separator 64 seal ring 70, 71, 72 mounting boss 73 Through hole 74 volts 80 mounting bracket 82, 83, 84 boss 85 Compressor mounting hole 91, 92, 93, 94 Boss 95 Engine mounting hole 100 engine block L major axis direction R closed space S mounting surface

Claims (5)

[Claims] 1. A compression chamber in which an elliptical cylinder and a rotor having a plurality of vanes that are biased in a radial direction and rotatably provided in the cylinder are housed in a compressor case and are partitioned by vanes in the cylinder. And a compressor having a discharge port provided in the vicinity of the short diameter part of the cylinder, is attached to the attachment bracket by attaching it to the attachment bracket, and the attachment bracket is attached to the attachment portion of the attachment boss. The compressor is characterized in that it is mounted on a fixed side at different parts, and in the cylinder, the maximum vibration line passing through the center of the cylinder and the vicinity of the discharge port is substantially parallel to the mounting surface to the mounting bracket in the compressor case. Mounting structure. 2. The mounting bracket is generally plate-shaped in cross section, and is provided with bosses each having a mounting hole in a connecting portion with a mounting boss of a compressor case and a mounting portion with a fixed side. The compressor mounting structure according to claim 1. 3. The compressor mounting structure according to claim 1, wherein the cylinder has a major axis direction set to 41 ° to 90 ° with respect to a direction parallel to the mounting surface. 4. The compressor mounting structure according to claim 3, wherein the cylinder has a major axis direction set to 66 ° with respect to a direction parallel to the mounting surface. 5. An elliptical cylinder, a rotor provided with a plurality of vanes that are urged in a radial direction and rotatably provided in the cylinder, and an attachment portion to a fixed side, and the cylinder and the rotor are accommodated. A compressor case, which forms a compression chamber partitioned by vanes in the cylinder, and provides a discharge port in the vicinity of the minor diameter part of the cylinder, and the cylinder is mounted with a plurality of mounting parts of the compressor case. A compressor characterized in that the major axis direction is set to 41 ° to 90 ° with respect to the direction parallel to the plane.