JPH0533788A - Manufacture of rotary compressor - Google Patents

Abstract

PURPOSE:To fasten a rotor main body so that an engagement hole part of the rotor main body is not deformed in a drum shape by pressurizing a circular protruded part protruded from the outer end face of a rotor to surround the engagement hole part of the rotor main body, plastic flowing wall of the same part in front and rear groups of a shaft and fixing the rotor main body on the shaft. CONSTITUTION:A shaft 16b is press-fit in an engagement hole part 51 of a rotor main body 16a, and a fixed part 41 of the shaft 16b is engaged with the engagement hole part 51. Thereafter, a pressure force W is applied in the shaft direction on an outer peripheral face 45a of a circular protruded part 45 of the rotor main body 16a by a pressure member 57. Then a surplus wall comes into both of two rows of groups 52a, 52b, and connection of the rotor main body 16a and the shaft 16b comes to be stronger. After the rotor main body 16a and the shaft 16b are strongly connected to each other in this way, a rotor 16 with specified rotor outer edge face and shaft outer peripheral face is finished by cutting off the surplus wall and others of the circular protruded part 45 with a lathe and others so that it comes to be in the final shape shown by a broken line 116a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a rotary compressor, and more particularly to a method for easily attaching a rotor body to a shaft.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, a rotary compressor 10 used in an air conditioner for an automobile has a front side block 13 and a rear side block in a casing 11 composed of a front case 11a and a rear case 11b. A cam ring or cylinder (hereinafter, simply referred to as a cylinder) 12 sandwiched between 14 and a rotor body 16 housed in a bore 15 of the cylinder 12.
A rotor 16 having a and a shaft 16b penetrating both blocks 13 and 14 is provided. The rotor body 16a is formed integrally with the shaft 16b, and the shaft 16b is configured to be rotationally driven by a drive source (not shown) via an electromagnetic clutch (not shown) or the like.

As shown in FIG. 6, in the rotor body 16a, slide vanes 19 are slidably provided in five radially formed vane grooves 18, and a bore 15 formed in an inertial circular shape is provided. Inner peripheral surface 15a and contact point 17
It is rotatably provided in the state of being in contact with. A chamber defined by the slide vane 19 and the contact point 17 or between the slide vanes 19 and the inner peripheral surface 15a of the bore 15 is a compression chamber 20 for compressing the refrigerant. In this compression chamber 20, as the rotor 16 rotates, the slide vane 19 projects from the vane groove 18 and rotates while making sliding contact with the inner peripheral surface 15a of the bore 15, and the volume changes accordingly. Is compressed. The refrigerant introduced from the inflow port 22 of the rear case 11b into the compression chamber 20 is sucked into the suction port 23 formed in the rear side block 14.
Flowed in through. Then, after being compressed in the compression chamber 20, it is discharged from the discharge port 24 opened in the cylinder 12 to the outside through the communication passage 25 and the outflow port 26. A discharge valve 27 is provided at the discharge port 24 (see, for example, JP-A-63-173,892).

Reference numeral "30" in the drawing indicates a bearing portion, "3".
1 "is a strip-shaped spring material. The strip-shaped spring material 31 is shown in FIG.
The discharge valve 27 is formed in a plate shape as shown in FIG. Further, "32" is a stopper that regulates the movement amount of the spring member 31, and "33" is a tightening bolt that tightens the cases 11a and 11b, the cylinder 12 and the side blocks 13 and 14.

[0005]

The rotor 16 in the conventional rotary compressor 10 is generally made of iron in which the rotor body 16a and the shaft 16b are integrally formed by casting, but recently, reduction in weight and prevention of vibration have been achieved. High strength aluminum alloys have come to be used to achieve the above. For the purpose of simplifying the shape of the cast product and reducing the material cost, the shaft 16b of the rotor 16 and the rotor body 16a are manufactured separately, the shaft 16b is made of cast iron, and the rotor body 16a is made of aluminum alloy. A rotary compressor has also been proposed. But,
In this rotor 16, the rotor body 16a and the shaft 16
Since the fastening force decreases as the temperature rises due to the difference in coefficient of linear expansion from b, rattling or the like may occur when the rotor 16 rotates.

Therefore, in the rotary compressor disclosed in JP-A-59-68586, as shown in FIG.
Grooves M, M are provided at both ends of the rotor fixing portion F of the shaft 16b, and with the rotor body 16a positioned at the fixing portion F, the outer end surface of the rotor body 16a has pressing members 124, 124 whose corners are substantially right angles. By pressing in the axial direction with, the material forming the rotor body 16a is plastically flowed and pushed into the grooves M, M so that the rotor body 16a does not come off from the shaft 16b.

However, even if the rotor body 16a is a relatively soft aluminum alloy, a large force is required for the plastic flow of the material, so the through hole portion O of the rotor body 16a is as shown by the broken line in the figure. It deforms like a drum, and the fastening force due to the pressure of the rotor body 16a and the shaft 16b decreases,
There was a problem that the shaft could bend. Further, even if the through hole portion O is not deformed when the rotor body 16a and the shaft 16b are fastened to each other, a large residual stress exists in the rotor body 16a, so that the through hole portion O of the rotor body 16a is deformed as the temperature rises. However, there is a drawback that the fastening force is lowered.

The present invention has been made to solve such a conventional problem, and securely fastens the rotor body and the shaft so that the fitting hole portion of the rotor body is not deformed like a drum. It is an object of the present invention to provide a method for manufacturing a rotary compressor that can be used.

[0009]

In order to achieve the above-mentioned object, the present invention provides a rotor body housed in a bore of a cylinder sandwiched between a front side block and a rear side block, and both the blocks. In a method of manufacturing a rotary compressor including a rotor having a shaft penetrating therethrough, grooves are formed on outer peripheral surfaces of both end portions of a fixed portion of the shaft to which the rotor body is fixed, and the rotor body into which the shaft is press fitted is fitted. An annular convex portion is projected from the outer end surface of the rotor so as to surround the abutment portion, and the annular convex portion is pressed by a pressure member, and the meat of the annular convex portion is plastically flowed into both grooves of the shaft, and the rotor body is attached to the shaft. It is a method of manufacturing a rotary compressor, characterized in that it is fixed.

The annular convex portion is an inclined surface having a predetermined angle which gradually approaches the shaft direction as the outer peripheral surface thereof is separated from the rotor outer end surface, and the outer peripheral surface of the annular convex portion has an angle substantially the same as the inclined surface. It is preferable to pressurize by a pressurizing member having an inclined surface, and in the rotor, after the rotor main body is fixed to the shaft by plastic flow, the excess thickness of the annular convex portion is scraped off, and the predetermined rotor outer end surface and the shaft are removed. It is preferable to use the outer peripheral surface. Further, it is preferable that the shaft is made of steel, and the rotor body is made of an aluminum alloy, and that the fixed portion of the shaft and the rotor body are connected by concave and convex fitting by serration.

[0011]

In the method of manufacturing the rotary compressor according to the present invention, the annular convex portion is projected from the outer end surface of the rotor so as to surround the fitting hole portion of the rotor body, and the annular convex portion is pressed by the pressing member, Since the rotor main body is fixed to the shaft by plastically flowing the meat of the annular convex portion into both grooves of the shaft, the rotor main body and the shaft can be fastened only by pressurizing the annular convex portion with the pressing member, The axial pressing force applied to the rotor body during this fastening can also be minimized. Therefore, it is possible to prevent the drum-shaped deformation of the fitting hole portion,
A reliable fastening force can be secured.

Further, the shape of the annular convex portion is an inclined surface having a predetermined angle such that the outer peripheral surface thereof gradually approaches the shaft direction as it is separated from the rotor outer end surface, and the outer peripheral surface of the annular convex portion is substantially the same as the inclined surface. When pressure is applied from the axial direction by the pressing member having the inclined surface of the same angle, a large component force is concentrated on the annular convex portion, and the axial pressing force applied to the rotor body at the time of fastening is further reduced. Furthermore, after the rotor main body is fixed to the shaft by plastic flow and the surplus wall of the annular convex portion is cut off, a desired rotor can be easily obtained.
If the rotor main body and the shaft are fitted in serrations by serrations, it is possible to obtain a coupling strength between the rotor main body and the shaft that sufficiently opposes the compression reaction force applied to the rotor main body when using the compressor or the frictional force of the sliding portion. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a rotary compressor according to the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a rotor according to an embodiment of the present invention,
2 is an enlarged view of a main part of a cross section taken along line 2-2 of FIG.
And FIG. 4 is an enlarged cross-sectional view of a main part for explaining the method according to the present invention. In the following description, FIGS.
It will be explained with reference to also.

The rotary compressor 10 of this embodiment is
As shown in FIGS. 5 and 6, a casing 11 including a front case 11a and a rear case 11b is provided, and a cylinder 12 is provided between the front side block 13 and the rear side block 14 provided in the casing 11.
Is sandwiched between. The rotor 16 rotatably provided in the cylinder 12 includes a rotor body 16a and a shaft 16
b, the shaft 16b has both side blocks 12,
It penetrates through 13. The rotor body 16 a is fitted and fixed to the shaft 16 b and is housed in the bore 15 of the cylinder 12.

The rotor 16 is shown in FIGS. 1, 2 and 4.
As shown in FIG. 3, the rotor body 16a and the shaft 16b are combined together, the rotor body 16a is made of a high-strength aluminum alloy, and the shaft 16b is made of steel. The rotor body 16a is provided with a fitting hole portion 51 for fitting the shaft 16b.
A serration 53 is provided on a part of the inner peripheral surface of No. 1 so as to engage with the shaft 16b in a concavo-convex manner. on the other hand,
The shaft 16b has two annular grooves 52 on the outer peripheral surface of both end portions of the fixed portion 41 to which the rotor body 16a is fixed.
a and 52b are provided.

Particularly, in this embodiment, the shaft 16b is
A ring-shaped convex portion 45 is projected from the rotor outer end surface 43 so as to surround the fitting hole portion 51 of the rotor body 16a into which is pressed. The annular convex portion 45 is pressed by a pressing member 57 (see FIGS. 3 and 4) such as a punch, and the meat is attached to the shaft 16b.
The rotor body 16a is fixed to the shaft 16b by plastically flowing into both the grooves 52a and 52b.

Referring to FIGS. 3 and 4, first, the shaft 16b is fitted into the fitting hole 51 of the rotor body 16a.
Then, as shown in FIG. 3, the fixed portion 41 of the shaft 16b is fitted into the fitting hole portion 51. Next, the pressure member 5
7, a pressing force W is applied to the outer peripheral surface 45a of the annular convex portion 45 of the rotor body 16a in the axial direction. In this case, the outer peripheral surface 45a of the annular convex portion 45 is an inclined surface having a predetermined angle θ, for example, 45 degrees so as to approach the shaft direction, and the outer peripheral surface 45a of the annular convex portion 45 serves as a pressing member. Since the inclination angle of the end contacting the inclined surface is substantially the same as that of the outer peripheral surface 45a, the pressing member 57 is used.
The force that pressurizes the wall of the annular convex portion 45 to plastically flow is
It becomes W cos θ, and a relatively large force close to the pressing force W can be applied. Therefore, the excess meat is shown in FIG.
As shown in (2), the two grooves 52a and 52b are inserted into both grooves, and the connection between the rotor body 16a and the shaft 16b becomes stronger. It should be noted that the inclination angle θ of the outer peripheral surface 45a of the annular convex portion 45 does not necessarily have to be 45 degrees, and the pressing force W of the pressing member 57 when the shaft 16b and the rotor body 16a are fastened is the groove 52.
Any angle may be used as long as it is set so that an effective component force is exerted in the a and 52b directions. After the rotor body 16a and the shaft 16b are connected more firmly in this manner, the surplus meat of the annular convex portion 45 is ground using a lathe or the like so that the final shape shown by the broken line 116a in the drawing is obtained. Then, the rotor 16 having the predetermined outer end surface of the rotor and the outer peripheral surface of the shaft is finished.

The rotor 1 formed by such a method
6 is an annular convex portion 4 on the two grooves 52a, 52b by minimizing the axial pressing force applied to the rotor body 16a.
The meat of No. 5 is inserted and the shaft 16b and the rotor body 16
Since it is fastened with a, the drum-shaped deformation of the fitting hole portion 51 can be prevented even though the fastening is strong. Also,
Due to the concavo-convex fitting by the serrations 53, the connection between the rotor body 16a and the shaft 16b can sufficiently oppose even if a compression reaction force applied to the rotor body 16a or a frictional force of a sliding portion acts when the compressor is used. Therefore, as compared with the conventional rotary compressor, the durability becomes excellent in the operation at high load and high speed.

The present invention is not limited to the above embodiment, and for example, as the material of the rotor body 16a, ceramics, resins, etc. can be used in addition to the high-strength aluminum alloy. Also, the groove 52
Since the rotor body 16a is sufficiently fixed to the shaft 16b only by fitting and fastening the a and 52b and the meat of the annular convex portion 45, it is not always necessary to provide the concave and convex fitting means such as the serration.

[0020]

As described above, according to the present invention,
An annular convex portion is projected from the outer end surface of the rotor so as to surround the fitting hole portion of the rotor body, and the annular convex portion is pressed by a pressing member to plastically flow the meat of the annular convex portion into both grooves of the shaft. Since the main body is fixed to the shaft, the rotor main body and the shaft can be fastened by simply pressing the annular convex portion with the pressurizing member, and the axial pressing force applied to the rotor main body at the time of this fastening is also minimized. Therefore, the fitting hole can be prevented from being deformed, and a reliable fastening force can be secured.

Further, the outer peripheral surface of the annular convex portion is an inclined surface having a predetermined angle which gradually approaches the shaft direction as the outer peripheral surface is separated from the rotor outer end surface, and the outer peripheral surface of the annular convex portion is
If pressure is applied from the axial direction by a pressure member having an inclined surface having substantially the same angle as this inclined surface, a large component force is concentrated on the annular convex portion, and the axial pressing force applied to the rotor body at the time of fastening is further reduced. Will be things.

Further, after the rotor body is fixed to the shaft by plastic flow, the surplus wall of the annular convex portion is cut off.
A desired rotor can be easily obtained. If the rotor body and the shaft are fitted into each other by serrations, it is possible to obtain a coupling strength between the rotor body and the shaft that sufficiently opposes the compression reaction force applied to the rotor body or the frictional force of the sliding portion when the compressor is used. .

[Brief description of drawings]

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

FIG. 2 is an enlarged view of a main part of a cross section taken along line 2-2 of FIG.

FIG. 3 is an enlarged sectional view of an essential part for explaining the method of the present invention.

FIG. 4 is an enlarged sectional view of an essential part for explaining the method of the present invention.

FIG. 5 is a cross-sectional view showing a rotary compressor.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a cross-sectional view showing a coupled state of a shaft and a rotor of a conventional rotary compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Rotary compressor 12 ... Cylinder, 13 ... Front side block, 14 ... Rear side block, 15 ... Bore 16 ... Rotor, 16a ... Rotor main body, 19 ... Slide vane, 21 ... Shaft, 41 ... Fixed part, 43 ... Outside rotor End surface, 45 ... Annular convex portion, 45a ... Outer peripheral surface, 51 ... Fitting hole portion, 52a, 52b ... Groove 53 ... Serration θ ... Inclination angle of outer peripheral surface.

Claims (5)

[Claims] 1. A rotor body (16a) housed in a bore (15) of a cylinder (12) sandwiched between a front side block (13) and a rear side block (14), and both blocks ( In a method of manufacturing a rotary compressor provided with a rotor (16) having a shaft (16b) penetrating through (13) and (14), a shaft (16) to which the rotor body (16a) is fixed.
Grooves (52a) on the outer peripheral surface of both ends of the fixed part (41) of b)
, (52b) are formed, and an annular convex portion (45) is projected from the rotor outer end surface (43) so as to surround the fitting hole portion (51) of the rotor body (16a) into which the shaft (16b) is press-fitted, The annular convex portion (45) is pressed by the pressing member (57), and the meat of the annular convex portion (45) is plastically flowed into both the grooves (52a) and (52b) of the shaft (16b) to make the rotor body ( A method for manufacturing a rotary compressor, characterized in that 16a) is fixed to a shaft (16b). 2. The annular convex portion (45) is an inclined surface having a predetermined angle (θ) that gradually approaches the shaft direction as the outer peripheral surface (45a) is separated from the rotor outer end surface (43).
The manufacturing of a rotary compressor according to claim 1, wherein the outer peripheral surface (45a) of the (45) is pressed by a pressing member (57) having an inclined surface having substantially the same angle as the inclined surface. Method. 3. The rotor (16) cuts off excess thickness of the annular projection (45) after the rotor body (16a) is fixed to the shaft (16b) by plastic flow, and a predetermined rotor outer end surface ( 43)
3. The method for manufacturing a rotary compressor according to claim 1, wherein the outer peripheral surface of the shaft (16b) is formed. 4. The shaft (16b) is made of cast iron,
The method of manufacturing a rotary compressor according to claim 1, wherein the rotor body (16a) is made of an aluminum alloy. 5. The method of manufacturing a rotary compressor according to claim 1, wherein the fixed portion (41) of the shaft (16b) and the rotor body (16a) are connected by serrations (53). .