JP2001153037A - Swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable quantity swash plate type compressor solving a lubrication deficiency problem by positively and sufficiently feeding oil mist existing in a crank chamber to a sliding mechanism between a swash plate and a piston. SOLUTION: The swash plate 17 changing an inclination angle is provided with a though hole 26 penetrating through the swash plate in an angle regulating projection 25 provided for regulating the inclination angle and the oil mist in the crank chamber 7 is lead to a shoe 23 between the swash plate and the piston 21 through the through hole. A drive shaft 11 is extended and rotatably supported to the crank chamber. The swash plate is connected to the drive shaft in the crank chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement type swash plate type compressor whose capacity is changed by changing the inclination angle of a swash plate, and more particularly to lubrication of a sliding portion thereof.

[0002]

2. Description of the Related Art A general variable displacement swash plate type compressor includes a drive shaft extending in a crank chamber and rotatably supported, and a swash plate variably connected to the drive shaft in the crank chamber at an inclination angle. , A piston, and a sliding mechanism in which the piston is slidably engaged with a peripheral portion of the swash plate. When the swash plate rotates with the rotation of the drive shaft, the piston reciprocates to compress the gas fluid. At that time, the sliding mechanism always slides on the swash plate and other parts, and thus needs to be lubricated.

[0003] The gas fluid to be compressed usually includes
An appropriate amount of lubricating oil is included to lubricate sliding parts such as bearings. Since the lubricating oil exists in the crankcase as oil mist, lubrication of the sliding mechanism by the oil mist can be expected.

A conventional variable displacement swash plate type compressor is disclosed in Japanese Patent Application Laid-Open No. Hei 10-54347. The variable displacement type swash plate compressor has a swash plate with a projection for regulating the inclination angle (here, this projection is referred to as an “angle regulation projection”). This angle regulating projection can also be expected to maintain a balance around the drive shaft.

[0005]

However, conventionally, since the sliding mechanism has not been actively lubricated, wear and seizure may occur due to insufficient lubrication. In particular, in the case of JP-A-10-54347,
The oil mist scattered by the centrifugal force caused by the rotation of the drive shaft accumulates in the angle regulating projections or is scattered in the axial direction along the angle regulating projections. Can not be supplied enough.
Therefore, poor lubrication occurs in the sliding mechanism, seizure and the like occur, and there is a problem in durability.

Accordingly, an object of the present invention is to provide a variable displacement swash plate type in which oil mist present in a crank chamber is positively and sufficiently supplied to a sliding mechanism between a swash plate and a piston to eliminate insufficient lubrication. An object of the present invention is to provide a compressor.

[0007]

According to the present invention, there is provided a crank chamber in which an oil mist is present, a drive shaft extending into the crank chamber and rotatably supported, and connected to the drive shaft in the crank chamber. A swash plate having a variable inclination angle, a piston, a sliding mechanism slidably engaging the piston with a peripheral portion of the swash plate, and a sliding mechanism provided on the swash plate to regulate the inclination angle. A swash plate compressor including an angle regulating projection, wherein the oil mist lubricates the sliding mechanism. In the swash plate compressor, the angle regulating projection has a through hole penetrating through the swash plate. A swash plate compressor is provided, wherein the oil mist is guided to the sliding mechanism through the hole.

[0008] The through-hole may penetrate the vicinity of the angle regulating protrusion and a portion radially outward of the angle regulating protrusion from the drive shaft side portion.

[0009] The through hole may branch off in the middle and open on both axial sides of the swash plate at a portion radially outside of the angle regulating projection.

According to the present invention, there is provided a cylinder block having a plurality of cylinder bores and one center bore, and a fluid suction chamber and a discharge chamber mounted on an end face of the cylinder block via a valve plate. A drive shaft extending into a crank chamber adjacent to the cylinder block and having one end rotatably supported in a center bore; rotating integrally with the drive shaft and tilting with respect to the drive shaft; A swash plate variably connected to a corner, a piston disposed reciprocally in the cylinder bore, and a shoe interposed between both sides of the swash plate and a neck of the piston; It is configured to convert the rotational movement of the swash plate into reciprocating motion of the piston via a shoe,
A swash plate compressor having a communication passage for communicating a crank chamber and a suction chamber for controlling the tilt angle of the swash plate, and controlling a pressure in the crank chamber to change a tilt angle of the swash plate; A swash plate type compressor having a through hole directed to a sliding portion between the swash plate and the shoe at an angle regulating projection provided on the swash plate to regulate an inclination angle of the swash plate. Is obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A swash plate type compressor according to an embodiment of the present invention will be described with reference to FIG.

This swash plate type compressor is a variable displacement type swash plate type compressor suitable for being included in a refrigeration cycle of a vehicle air conditioner, and has a plurality of cylinder bores (only one is shown) around an axis. , A cylinder block 3 having one center bore 2 on the axis, a front housing 4 opposed to one axial end of the cylinder block 3, and opposed to another axial end of the cylinder block 3 via a valve plate 5. And a cylinder head 6. Inside the front housing 4, a crank chamber 7 adjacent to the cylinder block 3 is formed. Inside the cylinder head 6, a suction chamber 8 and a discharge chamber 9 are formed adjacent to the valve plate 5. Each cylinder bore 1 communicates with a suction chamber 8 and a discharge chamber 9 via a suction valve and a discharge valve (both not shown). The cylinder block 3, the front housing 4, the valve plate 5, and the cylinder head 6 are connected to each other by fastening means (not shown) such as bolts.

The swash plate compressor further includes a drive shaft 11 that extends through the front housing 4 and extends on the axis. The drive shaft 11 extends into the crank chamber 7, and has one end rotatably supported by a radial bearing 12 in the center bore 2. The intermediate part of the drive shaft 11 is the radial bearing 1
The front housing 4 is rotatably supported by the front housing 4. Rotational power is transmitted to the outer end of the drive shaft 11 during operation.

In the crank chamber 7, the rotor 15 is firmly fixed so as to rotate integrally with the drive shaft 11. The rotor 15 faces the inner wall in the axial direction of the front housing 4 via the thrust bearing 16. Rotor 1
A swash plate 17 is connected to 5 by a hinge mechanism 18. The swash plate 17 rotates integrally with the rotor 15 and has a variable inclination angle with respect to the drive shaft 11. A hole 19 is provided in the swash plate 17 so that the inclination angle of the swash plate 17 can be changed.

The cylinder block 3 is provided with an orifice passage 24 which connects the crank chamber 7 to the discharge chamber 9 via a displacement control valve 20. Thus, the swash plate 1
The configuration is such that the inclination angle of 7 depends on the pressure in the crank chamber 7 controlled by the capacity control valve 20 or the like. In addition, in order to regulate the inclination angle of the swash plate 17, the swash plate 17 has an angle regulating projection 25 which comes into contact with the rotor 15 at the maximum inclination.
Is provided. The angle regulating projection 25 has an arc-shaped inner surface 25a as shown in FIG.

A piston 21 is inserted into each cylinder bore 1 so as to be able to reciprocate in the axial direction. The piston 21 has a neck 22 on the periphery of the swash plate 17 as a sliding mechanism as a shoe 2.
3 slidably engaged. That is, the shoes 23 are interposed between both surfaces of the swash plate 17 and the neck 22 of the piston 21, respectively, and convert the rotational movement of the swash plate 17 into reciprocating motion of the piston 21. Since the inclination angle of the swash plate 17 is variable, the stroke of the piston 21 and the compression capacity are also variable accordingly.

During operation of the swash plate compressor, the drive shaft 1
1 is driven to rotate. When the drive shaft 11 rotates, the swash plate 1
7 also rotates around the axis. As the swash plate 17 rotates, the piston 21 is reciprocated in the cylinder bore 1 via the shoe 23. The gas fluid is compressed by the reciprocation of the piston 21 and transferred from the suction chamber 8 to the discharge chamber 9 through the cylinder bore 1.

A lubricating oil is stored in the crank chamber 7 for lubricating the radial bearing 14 and the thrust bearing 16. During operation, the lubricating oil scatters and is supplied to the radial bearing 14 and the thrust bearing 16. Also, some of the lubricating oil
As is well known, it is contained in the gas fluid and circulates through the refrigeration cycle to reach the discharge chamber 9. A part of the gas fluid containing the lubricating oil in the discharge chamber 9 passes through the orifice passage 24 and the crank chamber 7.
Discharged. As a result of these, the crankcase 7
Lubricant fills as oil mist.

The oil mist around the drive shaft 11 is guided radially outward along the axial end surface of the swash plate 17 and is supplied to a sliding surface between the swash plate 17 and the shoe 23. . At this time, in order to prevent the oil mist from accumulating in the angle regulating protrusion 25 or being scattered in the axial direction along the angle regulating protrusion 25, the swash plate 17 penetrates from the angle regulating protrusion 25. An extended through hole 26 is provided. The through hole 26 is formed in the vicinity of the angle regulating projection 25 and on the drive shaft 11 side, that is, in the inner surface 25a.
a, a plurality of, for example, three outlet openings 26 are provided on both sides in the axial direction of the swash plate 17 in a portion radially outside the angle regulating projection 25 in the middle thereof.
c.

According to this structure, during operation, the drive shaft 11
Is received by the angle regulating projection 25 and flows out through the through hole 26 to both axially outer sides of the radially outer portion of the swash plate 17, and positively and sufficiently contacts the sliding surface of the shoe 23. As a result, the lubrication of the sliding mechanism is improved, and the durability is improved.

[0021]

As described above, according to the present invention,
An oil mist present in the crank chamber is positively and sufficiently supplied to the sliding mechanism between the swash plate and the piston to provide a variable displacement type swash plate compressor in which insufficient lubrication is eliminated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a swash plate type compressor according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a swash plate in the swash plate compressor of FIG. 2 as viewed from an axial direction.

[Explanation of symbols]

 Reference Signs List 1 cylinder bore 2 center bore 3 cylinder block 4 front housing 5 valve plate 6 cylinder head 7 crank chamber 11 drive shaft 15 rotor 17 swash plate 18 hinge mechanism 20 capacity control valve 21 piston 23 shoe 24 orifice passage 25 angle regulating protrusion 26 penetration Hole 26a Inlet opening 26b Branch part 26c Outlet opening

Claims (4)

[Claims] 1. A crankcase in which an oil mist is present,
A drive shaft extending in the crank chamber and rotatably supported, a swash plate having a variable inclination angle connected to the drive shaft in the crank chamber, a piston, and the piston mounted on a peripheral portion of the swash plate. A sliding mechanism slidably engaged, and an angle regulating projection provided on the swash plate for regulating the inclination angle, wherein the oil mist lubricates the sliding mechanism. In the swash plate type compressor, a swash plate type compressor is characterized in that a through hole penetrating the swash plate is provided in the angle regulating projection, and the oil mist is guided to the sliding mechanism through the through hole. . 2. The swash plate type compression according to claim 1, wherein the through hole penetrates from the drive shaft side portion to a portion radially outward of the angle regulating projection near the angle regulating projection. Machine. 3. The swash plate compressor according to claim 1, wherein the through hole branches midway and opens on both axial sides of the swash plate at a portion radially outside the angle regulating projection. 4. A cylinder block having a plurality of cylinder bores and one center bore, a cylinder head having a fluid suction chamber and a discharge chamber mounted on an end surface of the cylinder block via a valve plate, A drive shaft extending into the crank chamber adjacent to the cylinder block and having one end rotatably supported in the center bore, and integrally connected to the drive shaft and variably connected to the drive shaft at a tilt angle; A swash plate, a piston disposed reciprocally in the cylinder bore, and a shoe interposed between both sides of the swash plate and a neck of the piston, and A crank configured to convert the rotational motion of the swash plate into a reciprocating motion of the piston, and having a communication passage for communicating a crank chamber and a suction chamber for controlling the tilt angle of the swash plate; In the swash plate type compressor that changes the inclination angle of the swash plate by controlling the pressure in the room, the swash plate and the angle regulating protrusion provided on the swash plate to regulate the inclination angle of the swash plate A swash plate type compressor having a through-hole directed toward a sliding portion with the shoe.