JP2554627Y2 - Rotary compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mounting structure of a rotor portion in a rotary compressor.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a rotary compressor 10 used for an air conditioner for an automobile or the like includes a front side block 13 and a rear side block 13 in a casing 11 comprising a front case 11a and a rear case 11b. A cam ring or cylinder (hereinafter, simply referred to as a cylinder) 12 sandwiched between the rotor 14 and a rotor body 16 housed in a bore 15 of the cylinder 12.
a and a rotor 16 having a shaft 16 b provided through both side blocks 13, 14.
The rotor body 16a is integrally formed 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. 4, the rotor main body 16a has slide vanes 19 slidably provided in five radially formed vane grooves 18, and a cylindrical bore 15 is formed. It is rotatably provided in a state of being closest to the inner peripheral surface 15a and the contact point 17. A chamber defined between the slide vane 19 and the contact point 17 or between the slide vanes 19, the inner peripheral surface 15a of the bore 15, and the outer peripheral surface of the rotor is a compression chamber 20 for compressing the refrigerant. In the compression chamber 20, the slide vane 19 projects from the vane groove 18 with the rotation of the rotor 16 and rotates while sliding on the inner peripheral surface 15a of the bore 15, and the volume changes with the rotation. Is compressed. The compression chamber 20 has an inlet 2 of the front case 11a.
The refrigerant flowing from 6 flows through a suction port 23 opened in the front side block 13. Then, after being compressed in the compression chamber 20, it is discharged to the outside from the outlet 22 through the communication passage 25 from the discharge port 24 opened in the cylinder 12. The discharge port 24 is provided with a discharge valve 27 (see, for example, JP-A-63-173892).

In the figure, reference numeral "30" denotes a bearing portion, and "31" denotes a belt-shaped spring material. The band-shaped spring member 31 is formed in a plate shape as shown in FIG. "32" is a stopper for restricting the amount of movement of the spring member 31, and "33" is a tightening bolt for tightening 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 cast iron in which a rotor body 16a and a shaft 16b are integrally formed by forging. To prevent such problems, high-strength aluminum alloys have been used. For the purpose of simplifying the shape and reducing material costs, a rotary compressor has been proposed in which the rotor body 16a and the shaft 16b are manufactured separately, the shaft 16b is made of cast iron, and the rotor body 16a is made of an aluminum alloy. ing. However, in the rotor 16, since the fastening force decreases with the temperature rise due to the difference in the linear expansion coefficient between the rotor body 16a and the shaft 16b, there is a possibility that rattling or the like may occur during rotation of the rotor.

Therefore, in a rotary compressor disclosed in Japanese Patent Application Laid-Open No. Sho 59-68586, as shown in FIG.
Grooves M, M are provided at both ends of a rotor fixing portion F of the shaft 16b. With the rotor main body 16a positioned at the fixing portion F, the outer end surface of the rotor main body 16a is
The material constituting the rotor body 16a is caused to plastically flow by being pressed in the axial direction by 24, 124, etc., and is pushed into the grooves M, M so that the rotor body 16a does not come off the shaft 16b. .

However, even if the rotor body 16a is a relatively soft aluminum alloy, the plastic flow of the material requires a large force, so that the through-hole portion O of the rotor body 16a is deformed into a drum shape, Body 16a and shaft 16
There has been a problem that the fastening force due to the pressure b decreases and the shaft may be bent. Also, the rotor body 16a
Even when the through hole O is not deformed when the shaft 16b is fastened to the shaft 16b, there is a large residual stress in the rotor main body 16a. Therefore, the through hole O of the rotor main body 16a is deformed as the temperature increases, and the fastening force is increased. Is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems, and has a rotary body capable of securely fastening a rotor body and a shaft such that a through hole of the rotor body does not deform into a drum shape. It is intended to provide a compressor.

[0009]

A rotary compressor according to the present invention for achieving the above object has a rotor body housed in a bore of a cylinder sandwiched between a front side block and a rear side block; a rotor comprising a shaft mounted so as to transmit the rotation to the rotor body, the rotary compressor in which the shaft is rotatably supported by the block, the
The shaft is formed on the rotor body.
Has an outer diameter larger than the inner diameter of the through hole where the
Serration that fits large-diameter part and concave and convex with the rotor body
And the serration on the opposite side of the large diameter portion.
A cylindrical member attached to a shaft end;
The rotor is inserted into the through hole of the
The large-diameter portion is directly fitted to the
The cylindrical member is pressed against the shaft in contact with the shaft.
Between the cylindrical member and the large diameter portion
The rotor body is sandwiched.

It is preferable that the rotor body is made of a high-strength aluminum alloy and the shaft is made of steel. It is preferable that the rotor body be connected to the shaft by serrations or the like. Further, it is more preferable that the coefficient of linear expansion of the tubular member is substantially the same as that of the shaft.

[0011]

In the rotary compressor according to the present invention, a large-diameter portion having an outer diameter larger than the through-hole portion of the rotor body is provided on the shaft, and the large-diameter portion is inserted from the other end of the shaft. Since the rotor body is sandwiched by the cylindrical member, the axial pressing force applied to the rotor body can be reduced compared with the case where the rotor material is plastically flowed in the groove provided on the shaft, and the through hole is formed. It is possible to prevent the drum-shaped deformation of the portion and the deformation due to the residual stress, and secure a secure fastening force. The linear expansion coefficient of the cylindrical member and shaft is
If they are substantially the same, there is no fear that the tubular member comes off due to a rise in temperature. Also, if the shaft and the rotor body are connected by serration, the connection strength between them is improved, and even if there is a compression reaction force applied to the rotor body or a frictional force of the sliding portion when the compressor is used, the connection between the rotor body and the shaft may occur. There is no play between them.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a rotor according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a main part of a section taken along line 2-2 of FIG. In the following description, description will be made with reference to FIGS.

[0013] The rotary compressor 10 of the present embodiment comprises:
As shown in FIGS. 3 and 4, the front side block 1 includes a casing 11 including a front case 11a and a rear case 11b.
The cylinder 12 is sandwiched between the rear block 3 and the rear side block 14. The rotor 16 rotatably provided in the cylinder 12 has a rotor body 16a and a shaft 16b, and the shaft 16b is connected to both side blocks 12,13.
We support in. The rotor body 16a is fitted and fixed to a shaft 16b, and is housed in the bore 15 of the cylinder 12. As shown in FIGS. 1 and 2, the rotor 16 is formed by combining a rotor body 16a and a shaft 16b. The rotor body 16a is made of a high-strength aluminum alloy, and the shaft 16b is made of steel. . The rotor main body 16a is provided with a through hole portion 41 for fitting with the shaft 16b, and a serration 55 is formed on a part of the inner peripheral surface of the through hole portion 41. On the other hand, the shaft 16b has a large-diameter portion 52 having an outer diameter D larger than the inner diameter d of the through-hole portion 41 at an end of the portion 51 to which the rotor main body 16a is fixed. The end portion has a small-diameter end portion 53 slightly smaller than the outer diameter of the portion 51. A serration 55 formed in a part of the portion 51 is fitted into the through-hole portion 41 in an uneven manner. The shaft 16b is connected to the rotor body 16
a is inserted so as to contact the large-diameter portion 52, and the serration 55 is fitted into the concave and convex at this insertion. The connection between the shaft 16b and the rotor body 16a is strengthened by the concave-convex fitting, and the rotational force of the shaft 16b is reliably applied to the rotor body 16a against a compression reaction force or a sliding friction force applied to the rotor body 16a when the compressor is used. Will be communicated.

In particular, in this embodiment, the rotor body 16a
Is clamped and fixed between the large-diameter portion 52 and the cylindrical member 57 press-fitted into the small-diameter end portion 53. Thus, if the rotor main body 16a is sandwiched between the cylindrical member 57 and the large diameter portion 52, the axial pressing force applied to the rotor main body 16a is reduced, and the drum-shaped deformation of the through-hole portion 41 in the rotor main body 16a is reduced. Can be prevented, and a reliable fastening force can be secured.

Here, the cylindrical member 57 is connected to the shaft 16b.
It is preferable to form them from materials having substantially the same linear expansion coefficient. This is because there is no problem such as the tubular member 57 coming off due to the temperature rise. Further, the outer diameter of the cylindrical member 57 is changed to the large diameter portion 5.
2, the hole diameters of both side blocks 13, 14 and the bearings 30, 30 are the same when supporting the large-diameter portion 52 and the small-diameter end portion 53 with the front side block 13 and the rear side block 14. And processing and assembly are facilitated.

The present invention is not limited to the above embodiment. For example, as the material of the rotor body 16a, ceramic, heat-resistant resin, or the like can be used in addition to a high-strength aluminum alloy .

[0017]

[Effects of the Invention] As described above, according to the present invention,
The shaft has a large-diameter portion where the through-hole portion of the rotor body abuts, and the rotor body is sandwiched between the large-diameter portion and a cylindrical member inserted from the end of the shaft. As a result, the axial pressing force applied to the rotor body can be reduced, and the through-hole portion of the rotor body does not deform like a drum, a secure fastening force can be secured, and there is no deformation due to residual stress due to the pressing force. It becomes a lightweight and durable rotary compressor.

[Brief description of the 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 in FIG.

FIG. 3 is a sectional view showing a rotary compressor.

FIG. 4 is a sectional view taken along line 4-4 in FIG.

FIG. 5 is a sectional view showing a conventional rotor.

[Explanation of symbols]

Reference Signs List 10 rotary compressor 12 cylinder 13 front side block 14 rear side block 15 bore 16
... rotor, 16a ... rotor body, 16
b: shaft, 41: through-hole part,
51: fixed portion, 52: large diameter portion, 53: other end portion, 55: serration, 57: cylindrical member, d: inside diameter of through hole portion, D: outside diameter of large diameter portion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Asai 4-3-1, Yashiki, Narashino-shi, Chiba Seiko Seiki Co., Ltd. 62-112964 (JP, U)

Claims (3)

(57) [Scope of request for utility model registration] 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 a shaft (16b) mounted to transmit rotation to the shaft (16a).
6b) is rotatably supported by the blocks (13) and (14), wherein the shaft (16b) is formed on the rotor body (16a).
Of the through hole (41) into which the shaft (16b) is inserted
A large diameter portion (52) having an outer diameter (D) larger than the inner diameter (d);
Serrations (55) to be fitted unevenly with the rotor body (16a)
Of the large diameter portion (52) with respect to the serration (55).
A cylindrical member (57) attached to the opposite shaft end.
Then, the rotor body (16a) is inserted into the through-hole portion (41) of the rotor body (16a),
Serrations (55) are directly engaged with the rotor body (16a).
And the large diameter portion (52) is brought into contact with the rotor body (16a).
The cylindrical member (57) is pressed against the shaft (16b) in the compressed state.
By inserting the cylindrical member (57) and the large diameter portion (52)
A rotor body (16a) sandwiched between the rotary compressor and the rotary compressor. 2. The rotor body (16a) is made of a high-strength aluminum alloy, and the shaft (16b) is made of steel.
A rotary compressor according to item 1. 3. The cylindrical member (57) has a linear expansion coefficient of
Rotary compressor of claim 1 Yafuto and (16b) Ru substantially the same der.