JPH07180675A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the corotation of the outer ring of an angular contact ball bearing without causing much weight increase of the whole compressor and the increase of driving torque. CONSTITUTION:The corotation of an angular contact ball bearing 32 is prevented by the interference of the fitting inner diameter of a front housing 30 to which the ball bearing 32 is mounted. Radial force based on compressive reaction and interference is supported by a reinforcing rib 3f only embedding and closing a recessed curve part 30c in the front housing 30 locally, so that the radial diameter enlargement of the front housing 30 is prevented without increasing the wall thickness of the whole front housing 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art As a conventional scroll compressor (hereinafter, simply referred to as a compressor), a compressor disclosed in Japanese Utility Model Laid-Open No. 60-77788 is known. In this compressor, the rear housing, the front end plate, and the front housing form an outer shape as a housing. A boss for mounting the clutch and a base end surface are formed in the front housing, and a bowl shape is formed by the front housing and the front end plate. A fixed scroll composed of a fixed side plate and a fixed spiral body is fixed to the rear housing, and a movable scroll composed of the movable side plate and the movable spiral body is meshed with the fixed scroll in the rear housing by shifting their phases by 180 °. There is. A drive shaft is rotatably supported on the front housing via an angular contact ball bearing, and a drive pin is provided at a rear end of the drive shaft so as to project therefrom. A drive bush for revolving the movable scroll is fitted to the drive pin, and a rotation preventing mechanism for preventing rotation of the movable scroll is provided between the front end plate and the movable side plate of the movable scroll.

In this compressor, when an electromagnetic clutch is brought into contact with the base end face and attached to a boss and the drive shaft is rotationally driven by this electromagnetic clutch, the drive bush is driven by a drive pin to rotate. The rotation of the drive bush is transmitted to the movable scroll via the radial bearing, and the movable scroll is prevented from rotating by the rotation preventing mechanism.
The movable scroll executes only the revolution movement. As a result, the compression chamber formed by the meshing of the fixed scroll and the movable scroll is moved toward the center of the spiral while gradually reducing the volume, so that the refrigerant gas is sucked into the compression chamber from the refrigerant suction port, Are sequentially compressed and discharged into the discharge chamber.

In this type of compressor, since the compression chamber is also formed in the center of the spiral, the drive shaft cannot penetrate in the axial direction, and the drive shaft has a so-called cantilever structure. . Then, a compression reaction force acts on the compression chamber by the compression of the refrigerant gas, and this compression reaction force is applied to the movable scroll,
The thrust force and the radial force act on the drive shaft via the drive bush, the drive pin, and the like. For this reason, the drive shaft is usually supported by an angular contact ball bearing fitted to the housing so as to support the thrust force and the radial force at the same time while continuing suitable rotation in a cantilever structure.

[0005]

However, in the above-mentioned conventional compressor, since the drive shaft is supported by the angular contact ball bearing, the radial force acts relatively on the rolling elements during operation, and the outer ring is There may be a case of turning around with the wearing surface. In this case, since creep occurs on the mounting surface, wear on the mounting surface causes deterioration of reliability.

On the other hand, by merely providing the fitting inner diameter of the mounting surface with a tightening allowance capable of preventing the outer ring from rotating together, not only the radial force based on the compression reaction force but also the radial force based on the tightening allowance are applied to the housing. As a result, the housing is likely to be radially expanded. For example, as shown in FIG. 3, the wearing surface 90 has a minimum necessary thickness.
When the angular contact ball bearing is driven into the front housing 90 in which the fitting inner diameter of a has a tightening margin that can prevent the outer ring 91 from rotating together, stress acts as shown by the arrow in the figure, and the boss 90b, etc. Distortion occurs. If the front housing 90 is deformed in this way, the receiving surface 90c and the base end surface 90d with which the rotation preventing mechanism (not shown) abuts.
Displacement also appears. This makes it difficult for the rotation preventing mechanism to function properly, and causes the base end surface 90d to press the stator of the electromagnetic clutch, which in turn impedes the rotation of the pulley, resulting in an increase in drive torque. On the other hand, if the thickness of the entire front housing is increased so as not to be easily deformed, the weight of the entire compressor is increased and the mountability on a vehicle or the like is impaired.

An object of the present invention is to prevent the outer ring of the angular contact ball bearing from being rotated without causing a significant increase in weight of the entire compressor and an increase in driving torque.

[0008]

In order to solve the above-mentioned problems, a compressor of the present invention has a boss for mounting a clutch and a base end face, and is formed in a bowl shape from the base end face through a concave curved portion. And a fixed scroll having a fixed side plate and a fixed scroll body fixed to the housing, a movable side plate and a movable scroll body housed in the housing and meshing with the fixed scroll to form a compression chamber. A scroll, a drive shaft supported via an angular contact ball bearing mounted in the housing, a drive bush that engages with a drive pin protruding from the rear end of the drive shaft, and revolves the movable scroll; A rotation preventing mechanism that engages with the housing and the movable side plate of the movable scroll to prevent the movable scroll from rotating, and the compression chamber is rotated by the revolution of the movable scroll. In a scroll compressor that is moved in the direction of the spiral center to reduce the volume, the fitting inner diameter of the housing in which the angular contact ball bearing is mounted has a tightening margin that can prevent the ball bearing from rotating together, and A novel measure is taken in that the housing is provided with a reinforcing rib that locally fills the concave portion.

[0009]

In the compressor of the present invention, the drive shaft is supported by the angular contact ball bearing in order to continue the suitable rotation while simultaneously supporting the thrust force and the radial force by the cantilever structure. , Radial force acts relatively large on rolling elements. However, in this compressor, the fitting inner diameter of the mounting surface has a tightening margin that can prevent the outer ring from rotating together, so that the rotation is prevented.

Also in this compressor, not only the radial force based on the compression reaction force, but also the radial force based on the interference is applied to the housing. But,
In this compressor, the reinforcing ribs that only locally fill the concave curved portion of the housing support both radial forces, so that the radial expansion of the housing is achieved without increasing the thickness of the entire housing. Diameter is prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. This compressor, as shown in FIG.
A fixed scroll 2 including a fixed side plate 21, a shell portion 22 which is integrally formed with the fixed side plate 21 and forms an outer shell, and a fixed scroll 23 formed inside the fixed side plate 21 by an involute curve or the like has a movable side plate. The compression chamber 1 is formed by meshing with the movable scroll 4 composed of a movable scroll plate 42 formed of an involute curve or the like inside the movable side plate 41.

The shell portion 22 of the fixed scroll 2 is fastened to the front housing 30 and the rear housing 38 with through bolts (not shown). The front housing 30 has a boss 30a for mounting a clutch and a base end surface 3.
0b is formed, the front housing 30 is
It is formed in a bowl shape from b through the concave curved portion 30c.
In addition, as shown in FIG. 2, the base end surface 30b has a boss 30a.
Electromagnetic clutch stator mounted on (not shown)
It has a concave portion 30d for preventing rotation of the stator and has a shape as shown in order to avoid interference with a welded portion of the stator and interference with a connector (not shown) connected to the stator.

As shown in FIG. 1, a drive shaft 33 extends in the boss 30a via a shaft sealing device 31, and a large diameter portion 33a is formed behind the drive shaft 33. .
The mounting surface 30e of the front housing 30 and the large diameter portion 33a
An interlocking inner ring type double row outward angular contact bearing 32 is interposed between and. Here, the wearing surface 30e
The fitting inner diameter has a tightening allowance capable of preventing the outer ring 32a of the angular contact ball bearing 32 from rotating together.

Further, the front housing 30 is shown in FIG.
As also shown, the reinforcing ribs 30f are formed in the radial direction so as to embed the concave curved portions 30c at three intervals. In addition,
The front housing 30 has an assembling flange 6 having through-holes through which four through bolts pass through in the axial direction.
0 and a mounting flange 61 having a through hole through which two mounting bolts (not shown) penetrate in the direction perpendicular to the axis are formed.

Then, as shown in FIG. 1, a drive pin 34 is projected from the rear end of the large diameter portion 33a of the drive shaft 33. A balance weight 35 and a drive bush 36 are fitted to the drive pin 34, and a boss of a movable side plate 41 is supported by the drive bush 36 via a radial bearing 37. The drive pin 34 has a drive surface 34 a inclined rearward in the rotation direction of the drive shaft 33, and a drive bush 36.
Can be guided in the radial direction along the drive surface 34a.

A predetermined number of rotation preventing pins 51a extending in the axial direction are provided between the front housing 30 and the movable side plate 41.
With a movable ring 51 having a rotation preventing pin 51a
Is engaged with a restriction hole 30g recessed in the front housing 30 and a restriction hole 41a recessed in the movable side plate 41 via steel liners, respectively, whereby the radial action of the drive shaft 33 and the movable side plate 41 is exerted. The force is received to prevent the movable side plate 41 from rotating. Here, the front and rear surfaces of the movable ring 51 provided with the rotation prevention pin 51a receive the radial force in a suitable manner, so that the front housing 3
0 and the movable side plate 41 have a gap of several tens of μm. On the other hand, the front and rear surfaces of the movable ring 51, which is not provided with the rotation prevention pin 51a, slidably abuts on the front housing 30 and the movable side plate 41, whereby the thrust force acting from the movable side plate 41 is received. ing. The rotation prevention pin 51a, the movable ring 51, and the regulation hole 3
A rotation prevention mechanism is configured by 0 g and 41 a.

Further, the front housing 30 is shown in FIG.
1, a suction flange 62 having a refrigerant suction port connected to the refrigeration circuit is formed, and the refrigerant suction port communicates with the inside of the compression chamber 1 at the suction stage by the opening of the movable ring 51, as shown in FIG. Has been done. Furthermore, the rear housing 38
A discharge chamber 39 is formed therein, and the discharge chamber 39 is communicated with a discharge port 2 penetrating the central portion of the fixed side plate 21 through a discharge valve mechanism 3, and a refrigerant discharge port (not shown). Is connected to the refrigeration circuit.

In this compressor configured as described above,
When the electromagnetic clutch is brought into contact with the base end surface 30b and attached to the boss 30a, and the drive shaft 33 is rotationally driven by this electromagnetic clutch, the drive bush 36 is driven by the drive pin 34 to rotate. The rotation of the drive bush 36 is transmitted to the movable side plate 41 via the radial bearing 37, and
Is the rotation prevention pin 51a, the movable ring 51, and the regulation hole 30.
Since the rotation is prevented by g and 41a, the movable scroll 4 executes only the revolution movement along the revolution circle. As a result, the compression chamber 1 formed by the fixed side plate 21, the fixed spiral body 23, the movable side plate 41, and the movable spiral body 42.
Are sequentially moved toward the center of the spiral while the volume is reduced, so that the refrigerant gas is sucked from the refrigeration circuit into the compression chamber 1 at the suction stage from the refrigerant suction port. After that, the refrigerant gas compressed by the movement of the compression chamber 1 is discharged through the discharge port 2 and the discharge valve mechanism 3.
Is discharged to the discharge chamber 39 via. During this time, the drive bush 36 is guided in the radial direction along the drive surface 34a of the drive pin 34 by the drive force of the drive shaft 33, thereby absorbing the small tolerance and the like of the fixed spiral body 23 and the movable spiral body 42. .

The compression reaction force acts in the compression chamber 1 due to the compression of the refrigerant gas. This compression reaction force is applied to the front and rear surfaces of the movable ring 51, the movable side plate 41, and the front housing 3.
0, there is a gap that allows sliding, there is a gap between the radial bearing 37 and the drive bush 36, and the drive bush 36 can move in the radial direction. 4, drive bush 36, drive pin 3
Drive shaft 3 as thrust force and radial force via 4 etc.
Act on 3. Here, the angular contact ball bearing 32 that supports the drive shaft 33 having a cantilever structure simultaneously supports the thrust force and the radial force.

Thus, even in this compressor, a relatively large radial force acts on the rolling elements 32b of the angular contact ball bearing 32 during operation. However, in this compressor, since the fitting inner diameter of the mounting surface 30e has a tightening margin capable of preventing the outer ring 32a from being rotated together, the rotation is prevented. Therefore, in this compressor, by preventing the outer ring 32a from rotating together, it is possible to avoid the occurrence of creep on the wearing surface 30e, which eliminates wear and the like on the wearing surface 30e, and thus achieves high reliability. it can.

Also in this compressor, the radial force based on the compression reaction force acts on the front housing 30. The front housing 3 has a fitting inner diameter of the mounting surface 30e with a tightening margin capable of preventing the outer ring 32a from rotating together.
On the other hand, when driving the angular contact ball bearing 32 against 0, the radial force based on the interference also acts on the front housing 30. However, in this compressor, the radial force based on the interference is reliably supported by the reinforcing rib 30f together with the radial force based on the compression reaction force.
Therefore, in this compressor, the front housing 30
Is not expanded in the radial direction, the rotation preventing mechanism functions properly, and the pulley of the electromagnetic clutch is maintained rotatably, so that the driving torque does not increase.

The reinforcing ribs 30f merely fill the concave curved portions 30c of the front housing 30 with three intervals, and do not increase the thickness of the entire front housing 30. Therefore, in this compressor, the weight of the entire compressor does not increase so much, and excellent mountability in a vehicle or the like can be exhibited. It should be noted that it is also possible to pre-process a reverse strain that allows for the strain in the housing in advance and absorb the radial force based on the interference due to this reverse strain.

Further, a conical housing having a space between the reinforcing ribs may be embedded.

[0024]

As described above in detail, since the compressor of the present invention has the structure described in the claims, it does not increase the weight and drive torque of the compressor as a whole. , It is possible to prevent the outer ring of the angular contact ball bearing from rotating together. That is, in this compressor, since the outer ring can be prevented from rotating together, the occurrence of creep on the wearing surface is avoided, wear on the wearing surface is eliminated, and high reliability can be achieved.

Further, in this compressor, since the deformation of the housing is prevented, the rotation preventing mechanism functions favorably, and the pulley of the clutch is favorably kept rotatably.
No increase in drive torque occurs. Furthermore, since this compressor employs a reinforcing rib that only partially fills the recessed curved portion of the housing, the entire compressor does not increase in weight so much, and the It can exhibit excellent mountability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a compressor according to an embodiment.

FIG. 2 is a front view of the front housing according to the compressor of the embodiment.

FIG. 3 is a stress diagram when a bearing is driven into a front housing having a tightening margin.

[Explanation of symbols]

30 ... Front housing 22 ... Shull part 38 ... Rear housing 30a ... Boss 30b ... Base end face 30c ... Recessed curved part 2 ... Fixed scroll 21 ... Fixed side plate 23 ... Fixed scroll body 4 ... Movable scroll 41 ... Movable side plate 42 ... Movable scroll body 1 ... Compression chamber 32 ... Angular contact ball bearing 33 ...
Drive shaft 34 ... Drive pin 36 ... Drive bush 51a, 51, 30a, 41a ... Rotation prevention mechanism (51a
... Rotation prevention pin, 51 ... Movable ring, 30g, 41a ...
Restriction hole) 30e ... Mounting surface 32a ... Outer ring 30f
... Reinforcing ribs

Front page continuation (72) Inventor Susumu Miyagawa 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (72) Inventor Yasushi Watanabe 2-chome, Toyota town, Kariya city, Aichi stock corporation Toyota Industries Co., Ltd. In-house (72) Inventor Tetsuhiko Fukunuma 2-1-1 Toyota-cho, Kariya City, Aichi Stock Company Toyota Industries Corp.

Claims (1)

[Claims] 1. A clutch mounting boss and a base end surface,
A housing formed in a bowl shape from the base end surface via a concave curved portion, a fixed scroll fixed to the housing and having a fixed side plate and a fixed scroll, and housed in the housing and meshed with the fixed scroll. Movable scroll having a movable side plate and a movable scroll forming a compression chamber, a drive shaft supported by an angular contact ball bearing installed in the housing, and a drive projecting from the rear end of the drive shaft. The movable bush is provided with a drive bush that engages with a pin to revolve the movable scroll, and a rotation preventing mechanism that engages with the movable side plate of the housing and the movable scroll to prevent the movable scroll from rotating. A scroll-type compressor in which the compression chamber is moved in the direction of the center of a spiral by movement to reduce the volume, wherein the angular contact ball bearing is mounted. The fitting inner diameter of the housing has a tightening margin capable of preventing the ball bearing from rotating together, and the housing is provided with a reinforcing rib for locally filling the concave curved portion. Scroll type compressor.