JPH05149247A - Compressor - Google Patents

Abstract

PURPOSE:To provide a compressor in small size by decreasing a length in the axial direction of a main shaft while preventing its rotational deflection. CONSTITUTION:A compressor comprises a main shaft 5 rotated by a rotational drive source, armature boss 13 fixed to the point end of the main shaft 5, ball bearing 14 rotatably supporting a point end side of the main shaft 5 to a front housing 3 of a compressor housing and a radial bearing 15 for rotatably supporting a rear end side of the main shaft 5 to the front housing 3. In a compressor of supporting rotation of the main shaft 5 by these bearings 14, 15, since this ball bearing 14 is interposed between the armature boss 13 and the front housing 3, rotational deflection of the main shaft can be surely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-point support type compressor having an improved main shaft rotation support structure.

[0002]

2. Description of the Related Art Conventionally, a compressor shown in FIG. 2 is known as a compressor of this type.

That is, 1 is a housing body of a compressor, 2 is a rear housing for sucking and discharging a refrigerant which covers one end opening of the housing body 1, and 3 is a front housing which covers the other end opening of the housing body 1. Component 1,
A compressor housing A is composed of the reference numerals 2 and 3. A projecting cylinder portion 4 is provided at the center of the front housing 3, and a main shaft 5 penetrates into the projecting cylinder portion 4, while an electromagnetic clutch mechanism 6 is provided on the outer surface of the projecting cylinder portion 4 with a ball bearing. It is fixed through 7.

A shaft rotor 8 connected to one end of the main shaft 5 and a swing plate 9 swingable by the rotation of the shaft rotor 8 are installed in the housing body 1. By the swinging action, the piston 10 is reciprocated to compress the refrigerant, and the refrigerant is sucked and discharged through the rear housing 2.

When driving this compressor, the driving force of an automobile engine (not shown) is transmitted to the clutch rotor 11 of the electromagnetic clutch mechanism 6 which is energized, and this clutch rotor is driven.
The torque of the motor 11 is transmitted to the main shaft 5 through the clutch plate 12 and the armature boss 13. The rotation of the main shaft 5 causes the shaft rotor 8 to rotate,
The swing plate 9 is swung to reciprocate the piston 10.

[0006]

In such a compressor, the rotating force of the main shaft 5 causes the shaft rotor 8 to rotate.
Since it is converted into a swinging motion by the swinging plate 9 via the, the main shaft 5 causes a rubbing motion with the radial bearing 15 as a fulcrum. Therefore, in order to suppress the rubbing movement, the tip end side of the main shaft 5 is interposed between the main shaft 5 and the protruding cylindrical portion 4 and the ball bearing 14 is provided.
Is pivotally supported by.

In order to reliably suppress the rubbing movement of the main shaft 5, the ball bearing 14 is arranged near the tip of the main shaft 5, and the distance between the ball bearing 14 and the radial bearing 15 is made as long as possible. It is preferable to set.

However, in the conventional structure, the armature boss 13 of the electromagnetic clutch mechanism 6 is provided on the tip side of the main shaft 5 with respect to the ball bearing 14, and the main shaft 5 is supported thereby. Therefore, due to space restrictions, the ball bearing 14 is interposed between the armature boss 13 arranged at the tip of the main shaft 5 and the radial bearing 15 on the rear end side, and is arranged at the tip of the main shaft 5. Therefore, there is a problem that the rubbing movement of the main shaft 5 cannot be sufficiently suppressed. For this reason, the supporting force of the main shaft 5 is still weak, which is a problem in terms of durability, and further causes vibration and noise. Also, the main shaft 5
Since the installation locations of the armature boss 13 and the ball bearing 14 are separately set in the axial direction of, the whole compressor becomes long in the axial direction of the main shaft 5, and there is a problem that the compressor becomes large. Was.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a compact compressor which prevents the rotational shake of the main shaft and shortens the axial length of the main shaft.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a main shaft rotated by a rotary drive source, an armature boss fixed to the tip of the main shaft, and a tip side of the main shaft. Includes a first bearing that rotatably supports the front housing of the compressor housing, and a second bearing that rotatably supports the rear end side of the main shaft to the front housing. Rotation of the main shaft is performed by each of the bearings. In the supporting compressor, the first bearing is interposed between the armature boss and the front housing.

[0011]

According to the present invention, since the first bearing is interposed between the armature boss and the front housing,
The fixed position of the first bearing is the same position as the armature boss in the axial direction of the main shaft, and the first bearing is arranged closer to the front end side of the main shaft. As a result, rotational shake of the main shaft is reliably suppressed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross section of an essential part of an embodiment of a compressor according to the present invention, and the same components as those of the conventional compressor shown in FIG.

That is, 3 is a front housing, 4 is a protruding cylindrical portion which projects from the center of the front housing 3, and 5
Is a main shaft that penetrates the protruding cylinder portion 4, 6 is an electromagnetic clutch mechanism that is connected to an automobile engine (not shown), 7
Is a ball bearing for fixing the electromagnetic clutch mechanism 6 to the protruding cylindrical portion 4. When the electromagnetic clutch mechanism 6 is energized, an electromagnetic force is generated, the clutch plate 12 is attracted to the clutch rotor 11, and the two are connected. As a result, the clutch plate 12
Also, the armature boss 13 connected to the leaf spring 12a via the leaf spring 12a rotates, and the main shaft 5 rotates accordingly.

The present invention has a characteristic structure in the support structure of the main shaft 5 in the compressor having such a structure.

That is, a ball bearing (first bearing) 1 is provided between the outer surface of the tubular portion 13a of the armature boss 13 that is crimped to the tip of the main shaft 5 and the inner surface of the protruding tubular portion 4 on the leading end side.
4 is interposed. The ball bearing 14 has an outer ring 14a.
Is fitted into the cutout portion 4a of the protruding tubular portion 4, and the inner ring 14b is interposed between the fixing ring 1 and the outer surface of the tubular portion 13a.
4c, and the armature boss 13 and the main shaft 5 are rotatably fixed to the front housing 3. On the other hand, the rear end side of the main shaft 5 is rotatably fixed to the front housing 3 by a radial bearing (second bearing) 15.

According to this embodiment, as described above, the fixed position of the ball bearing 14 is the same position as the armature boss 13 in the axial direction of the main shaft 5, which is the more distal position of the main shaft 5. The distance between the ball bearing 14 and the radial bearing 15 is increased, so that the main shaft 5 is stably supported. As a result, the rotational shake of the main shaft 5 is reliably suppressed.

[0017]

As described above, according to the present invention,
Since the first bearing is interposed between the armature boss and the front housing, the first bearing is located at the more distal end position of the main shaft, and the distance between the first bearing and the second bearing is lengthened. Rotational shake of the main shaft is reliably suppressed. Further, since the fixed position of the first bearing is the same position as the armature boss in the axial direction of the main shaft, and it is not necessary to provide the installation space for the first bearing in the axial direction of the main shaft, the shaft of the main shaft is not required. The directional length can be shortened, and the compressor can be downsized.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a compressor according to the present invention.

FIG. 2 is an overall cross-sectional view of a conventional compressor

[Explanation of symbols]

A ... Compressor housing, 3 ... Front housing, 5 ...
Main shaft, 13 ... amateur boss, 14 ... ball bearing, 15 ... radial bearing.

Claims (1)

[Claims] 1. A main shaft rotated by a rotary drive source, an armature boss fixed to a tip of the main shaft, and a first shaft for pivotally supporting a tip side of the main shaft to a front housing of a compressor housing. In a compressor that includes a bearing and a second bearing that supports the rear end side of the main shaft in the front housing, and supports the rotation of the main shaft by the bearings, the first bearing may be provided in the compressor. A compressor characterized by being interposed between a mature boss and the front housing.