JP4083340B2 - Bearing structure of swash plate type variable capacity compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swash plate type variable capacity compressor that is interposed in a refrigeration cycle of a vehicle air conditioner or the like and is used to compress refrigerant gas.
[0002]
[Prior art]
As is well known, a swash plate type variable capacity compressor has a drive shaft supported by a bearing portion of a compressor housing through a bearing member and is inserted into a crank chamber, and the rotation of the drive shaft is performed by a swash plate in the crank chamber. It is converted to a linear motion of the piston.
[0003]
[Problems to be solved by the invention]
Since the compressor housing is made of a lightweight metal material such as aluminum for the purpose of reducing the weight, the bearing hole diameter of the bearing portion in which the bearing member is fitted changes due to the heat effect, and the sitting stability of the bearing member, that is, There is a possibility that the mounting stability is impaired, and the rotation of the drive shaft and thus the swash plate may be adversely affected.
[0004]
Accordingly, the present invention provides a swash plate type variable capacity compressor that can improve the mounting stability of the bearing member and improve the rotational stability of the drive shaft and swash plate.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, a drive shaft is pivotally supported by a bearing portion of the compressor housing via a bearing member and is inserted into the crank chamber, and rotation of the drive shaft is performed by a swash plate in the crank chamber. In a swash plate type variable displacement compressor adapted to convert into linear motion, the inner peripheral surface of the bearing hole of the bearing portion is cast into the bearing portion and is harder than the bearing portion and has a large heat capacity. It is composed of a cylindrical bush made of a material, and on the outer periphery of the bush, an overhanging portion whose end face is at a right angle with respect to the axis of the oil passage formed in the bearing portion through the crank chamber and the bearing hole is integrally formed. The oil passage is formed by protruding and penetrating through the overhanging portion .
[0007]
【The invention's effect】
According to the first aspect of the invention, the inner peripheral surface of the bearing hole of the bearing portion is cast with a cylindrical bush made of a metal material having a hardness higher than that of the bearing portion and a large heat capacity. Since it is formed, it is difficult for the hole diameter to change due to thermal influence, the mounting stability of the bearing member fitted in the bearing hole is increased, and the rotational stability of the drive shaft and the swash plate can be improved.
[0008]
In addition , since the oil passage is formed at a right angle to the end face of the overhanging portion of the bush, the oil passage can be formed with high accuracy without causing the drill to hit the bushing edge at the time of drilling. Further, since the drill does not hit the bush edge, the life of the drill can be kept long.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0010]
In FIG. 1, reference numeral 1 denotes a compressor housing, a cylinder block having a plurality of cylinder bores 3, a front housing 4 which is disposed in front of the cylinder block 2 and forms a crank chamber 5 between the cylinder block 2, and a cylinder block 2 is provided with a rear housing 6 which is disposed with a valve plate 9 interposed therebetween and forms a refrigerant suction chamber and a refrigerant discharge chamber 8 which are not shown.
[0011]
In the crank chamber 5, a drive plate 11 fixed to the drive shaft 10, a journal 14 slidably connected by a pin 13 to a sleeve 12 slidably fitted to the drive shaft 10, and a boss of the journal 14 And a swash plate 18 in which a screw hole 17 is screwed and fixed to a screw portion 16 formed on the outer periphery of the portion 15.
[0012]
The journal 14 connects the hinge arm 20 to the hinge arm 21 of the drive plate 11 via the arc-shaped long hole 22 and the pin 23 of the hinge arm 21 so that the swing is regulated by the long hole 22. It has become.
[0013]
The pistons 24 disposed in each cylinder bore 3 are connected to the swash plate 18 via a pair of shoes 25 sandwiching the swash plate 18.
[0014]
For example, the inclination angle of the swash plate 18 is controlled by the pressure in the crank chamber 5 which is adjusted by controlling the flow rate of the refrigerant flowing into the refrigerant suction chamber by the pressure control valve mechanism 26 provided in the rear housing 6. The refrigerant discharge capacity is changed by changing the stroke of the piston 24 by changing the angle of the plate 18.
[0015]
Here, the drive shaft 10 is rotatably supported on a bearing member 31 having one end portion fitted in the bearing portion 30 of the cylinder block 2 and the other end portion is fitted in the bearing portion 32 of the front housing 4. The bearing member 33 is rotatably supported by a shaft.
[0016]
The cylinder block 2, the front housing 4 and the rear housing 6 constituting the compressor housing 1 are made of die-cast aluminum material for weight reduction. The bearing holes 34 of the cylinder block 2 and the front housing 4, The cylindrical bushes 36 and 37 made of a metal material having a higher hardness and a higher heat capacity than the aluminum material such as iron are integrally formed on the inner peripheral surface of at least the portion where the bearing members 31 and 33 are fitted. It is formed by casting.
[0017]
An oil seal 38 is fitted and disposed adjacent to the bearing member 33 at a position outside the bearing member 33 of the bearing hole 35 of the front housing 4.
[0018]
The bearing portion 32 of the front housing 4 is provided with an oil passage 40 that obliquely penetrates between the bearing member 33 of the bearing hole 35 and the oil seal 38 and the crank chamber 5. The oil supply structure is adopted so as to improve the cooling performance of the oil seal 38 and the lubricity of the oil seal 38 and the bearing member 33 by capturing and introducing the mist-like oil into the oil passage 40. On the outer periphery of one end portion near the oil seal 38 that enters the region where the oil passage 40 is formed, a projecting portion 41 whose end face is perpendicular to the axis of the oil passage 40 is integrally projected. The oil passage 40 is formed through 41.
[0019]
In FIG. 1, 27 is a reed valve for opening and closing the discharge port 28 of the valve plate 9, 29 is a reed valve for opening and closing a suction port outside the drawing of the valve plate 9, and 39 supports the reed valve 27 and regulates the opening degree. Indicates a retainer.
[0020]
According to the structure of the above embodiment, the inner peripheral surfaces of the bearing holes 34 and 35 of the bearing portions 30 and 32 in which the bearing members 31 and 33 that pivotally support the drive shaft 10 are fitted are arranged on the bearing portions 30 and 32. Since the cylindrical bushes 36 and 37 made of a metal material such as iron having a higher hardness and higher heat capacity than the aluminum material forming the member 32 are integrally formed, the bearing holes 34 and 35 are formed. It is difficult for the hole diameter to change due to the heat effect, and the mounting stability of the bearing members 31 and 33 can be increased, and the rotational stability of the drive shaft 10 and the swash plate 18 can be improved. Therefore, the compression performance and the sound vibration performance are improved. Can be improved.
[0021]
Further, since the oil passage 40 is formed in the projecting portion 41 on the outer periphery of the end portion of the bush 37 on the bearing portion 32 side at a right angle to the end face, the drill hits the end edge of the bush 37 at the time of drilling and escapes. Therefore, the oil passage 40 can be formed with high accuracy, and since the drill does not hit the edge of the bush 37, the life of the drill can be kept long.
[0022]
In the case where the oil passage 40 is formed obliquely as described above, the oil passage 40 may be bent halfway or the front housing 4 of the front housing 4 may be bent in order to avoid contact with the edge of the bush 37. The axial direction dimension of the bearing portion 32 is increased so that the position of the oil seal 38 is further moved to the left side (the clutch side outside the figure) in FIG. 1 so that the oil passage 40 is disengaged from the position of the bush 37. However, in these cases, the processability of the oil passage 40 is deteriorated. In the latter case, the width of the front housing 4 is increased and the housing 1 is enlarged. Although the problem which becomes disadvantageous in weight arises, these problems can be solved by projecting the overhang | projection part 41 in the bush 37 as mentioned above, and also the durability of a drill It is possible to increase.
[0023]
Furthermore, although the bearing portion closer to the clutch that transmits the driving force of the compressor receives a larger load, the presence of the overhanging portion 41 on the outer periphery of the end portion of the bush 37 increases the drag force of the bearing portion 32 and improves the bearing performance. Can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor housing 5 Crankshaft 10 Drive shaft 18 Swash plate 24 Piston 30, 32 Bearing part 31, 33 Bearing member 34, 35 Bearing hole 36, 37 Bush 40 Oil passage 41 Overhang part

Claims (1)

The drive shaft (10) is pivotally supported on the bearing portions (30), (32) of the compressor housing (1) via the bearing members (31), (32), and is inserted into the crank chamber (5). In the swash plate type variable capacity compressor, in which the rotation of the drive shaft (10) is converted into linear motion of the piston (24) by the swash plate (18) in the crank chamber (5), the bearing portion (30), The inner peripheral surfaces of the bearing holes (34) and (35) of (32) are cast and formed in the bearing portions (30) and (32), and the hardness is higher than that of the bearing portions (30) and (32). , Composed of cylindrical bushes (36), (37) made of a metal material having a large heat capacity ,
On the outer periphery of the bush (37), an end surface is projected so as to be perpendicular to the axis of the oil passage (40) formed through the bearing portion (32) through the crank chamber (5) and the bearing hole (35). A bearing part structure for a swash plate type variable displacement compressor, characterized in that a part (41) protrudes integrally and penetrates the projecting part (41) to form the oil passage (40) .

Images