JPH10196531A - Variable capacity swash plate compressor and surface treatment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a polishing process unnecessary, and to prevent the deformatin of a sliding face of a swash plate, by performing the surface treatment by the gas nitrosulphurizing treatment, or electroless Ni-P-B plating, onto the swash plate and a projecting part which forms a part of a link mechanism mounted on the swash plate. SOLUTION: In a variable capacity swash plate compressor, a thrust flange 40 for transmitting the rotation of a shaft 5 to a swash plate 10, is fixed on a front side edge of the shaft 5, the thrust flange 40 and the swash plate 10 are connected through a link mechanism 41 in which a point part 43a of a rod is fitted in a guide groove 10f formed on a bracket (projecting part) 10e in such manner that it is relatively slidable, and the swash plate is mounted in such manner that it can be inclined to a face vertical to the shaft 5. On this occasion, the surface treatment is performed onto the swash plate 10 and the projecting part 10e by the gas nitrosulphurizing method or the electroless Ni-P-b plating method. Thereby the surface of the swash plate 10 and the projecting part 10e are hardened, and the abrasion resistance, the lubricating characteristics and the durability can be improved.

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 and a surface treatment method for the variable displacement type swash plate type compressor.

[0002]

2. Description of the Related Art A thrust flange for transmitting rotation of the shaft to a swash plate is fixed to a front end of a shaft of a variable displacement type swash plate compressor. The thrust flange is connected to a front head via a thrust bearing. Is rotatably supported on the inner wall surface. The thrust flange and the swash plate are connected via a link mechanism, and the swash plate can be inclined with respect to a plane perpendicular to the shaft.

The swash plate is supported by a shaft so as to be tiltable. A shoe for supporting one end of the connecting rod is held by a retainer on the sliding surface of the swash plate. The other end of the connecting rod is fixed to the piston.

The link mechanism includes a bracket provided on a front surface of a swash plate, a linear guide groove provided on the bracket, and a rod screwed to a thrust flange. The spherical tip of the rod is fitted into the guide groove so as to be relatively slidable.

The aforementioned shaft, swash plate, bracket, and rod are formed of an iron-based material.

When the rotational power of the vehicle engine is transmitted to the shaft, the rotational force of the shaft is transmitted to the swash plate via the thrust flange and the link mechanism, and the swash plate rotates.

The rotation of the swash plate causes the shoe to relatively rotate on the sliding surface of the swash plate, so that the rotational force from the swash plate is converted into a linear reciprocating motion of the piston. The piston reciprocates in the cylinder bore, resulting in a change in the volume in the cylinder bore,
The suction, compression and discharge of the refrigerant gas are sequentially performed by this volume change. The inclination angle of the swash plate changes according to a change in the pressure of the crank chamber in which the swash plate is housed, and a high-pressure refrigerant gas having a capacity corresponding to the inclination angle is discharged.

[0008]

During operation of the compressor, the shoe slides (relatively rotates) on the sliding surface of the swash plate.
The inner peripheral surface of the swash plate slides on the outer peripheral surface of the shaft, and the tip of the rod slides on the guide groove (relative sliding).

Conventionally, in order to suppress the wear of the swash plate, bronze spraying or molybdenum disulfide (MoS
2) coating or quenching and tempering of the entire swash plate.

[0010] However, the heat treatment of the swash plate causes thermal distortion and requires a polishing step after the heat treatment. However, there is a problem that the hardness increases greatly and the tool is consumed greatly.

In addition, in the surface treatment of the sliding surface of the swash plate, pretreatment such as blasting and polishing before treatment and polishing after treatment are required, so that the operation is complicated.

Further, in the surface treatment by thermal spraying or coating, if there is a protruding portion like a bracket of a swash plate, the coating is difficult and the coating is not uniform. As a method for avoiding this, there is a method in which the swash plate is composed of two parts, a surface treatment is performed for each part, and the respective parts are joined together after the surface treatment. In addition to the rise, there is a problem that the sliding surface of the swash plate is distorted by stress generated at the time of joining.

The present invention has been made in view of such circumstances, and its object is to eliminate the need for a polishing step, to minimize the distortion of the sliding surface of the swash plate, and to increase the manufacturing cost. An object of the present invention is to provide a plate compressor.

[0014]

According to a first aspect of the present invention, there is provided a variable displacement type swash plate type compressor, comprising: a rotating member fixed to a rotating shaft and rotating integrally with the rotating shaft;
A swash plate that is tiltably supported on the rotating shaft, is connected to the rotating member via a link mechanism, and rotates integrally with the rotating member, and relatively rotates on a sliding surface of the swash plate. A piston that is connected to the swash plate via a shoe and linearly reciprocates in a cylinder bore as the swash plate rotates, wherein the swash plate is provided with a convex portion that constitutes a part of the link mechanism. In the displacement type swash plate type compressor, the swash plate and the projections are subjected to a surface treatment by a gas sulphonitriding method or an electroless nickel-phosphorus-boron plating method.

As described above, since the swash plate and the projections are subjected to the surface treatment by the gas sulfide nitriding treatment method or the electroless nickel-phosphorus-boron plating treatment method, the abrasion resistance due to the surface hardening of the swash plate and the projections is obtained. The properties or lubrication properties are improved.

According to a second aspect of the present invention, there is provided a variable displacement type swash plate type compressor, comprising: a rotating member fixed to a rotating shaft and rotating integrally with the rotating shaft; A swash plate connected to the rotating member, and integrally rotating with the rotation of the rotating member; and a swash plate connected to the swash plate via a shoe relatively rotating on a sliding surface of the swash plate. A piston that linearly reciprocates in a cylinder bore as the cylinder rotates, and wherein the swash plate is provided with a convex portion that constitutes a part of the link mechanism. The part is subjected to a surface treatment by a gas sulfide nitriding treatment method or an electroless nickel-phosphorus-boron plating treatment method.

As described above, the swash plate and the convex portion are subjected to the surface treatment by the gas sulfide nitriding method or the electroless nickel-phosphorus-boron plating method, so that both the swash plate and the convex portion are processed in one step. Since surface treatment can be performed, a uniform film can be formed even with a complicated shape, and the processing temperature is low and the distortion is small, a polishing step after the processing becomes unnecessary.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a variable displacement type swash plate type compressor according to one embodiment of the present invention.

A rear head 3 is fixed to one end face of a cylinder block 1 of the variable displacement type swash plate type compressor via a valve plate 2, and a front head 4 is fixed to the other end face. A plurality of cylinder bores 6 are provided in the cylinder block 1 at predetermined intervals in the circumferential direction around the shaft 5.
Are arranged. A piston 7 is slidably accommodated in each of the cylinder bores 6.

A crank chamber 8 is provided in the front head 4.
A swash plate 10 is accommodated in the crank chamber 8. The swash plate 10 is mounted on the shaft 5 so as to be tiltable. The swash plate 10 is connected to the piston 7 via shoes 50,50. The shoes 50, 50 are arranged so as to sandwich the swash plate 10, and the flat portions 50b,
50b is in contact with the sliding surfaces 10a and 10c of the swash plate 10.

A concave portion 51 into which a part of the swash plate 10 enters is formed at one end 7a of the piston 7, and concave portions 51a and 51b facing the moving direction of the piston 7 are formed in the concave portion 51. The shoes 50, 5 are provided on the concave portions 51a, 51b.
The 0 convex surfaces 50a, 50a are slidably supported.

The rear head 3 has a discharge chamber 12 and a suction chamber 13 located around the discharge chamber 12. The rear head 3 is provided with a suction port 3a that communicates with an outlet of an evaporator (not shown), and a communication path (not shown) is provided between the suction port 3a and the suction chamber 13. A regulating valve 32 is provided.
2, the pressure in the suction chamber 13 and the pressure in the crank chamber 8 are adjusted.

The valve plate 2 has a discharge port 16 for communicating the cylinder bore 6 with the discharge chamber 12 and a suction port 15 for communicating the cylinder bore 6 with the suction chamber 13.
Are provided at predetermined intervals in the circumferential direction. The discharge port 16 is opened and closed by a discharge valve 17, and the discharge valve 17 is fixed to a rear head side end surface of the valve plate 2 by a bolt 19 and a nut 20 together with a valve retainer 18.

The suction port 15 is opened and closed by a suction valve 21, and the suction valve 21 is disposed between the valve plate 2 and the cylinder block 1. The bolt 19 is provided with a guide hole 19a for guiding the high-pressure refrigerant gas in the discharge chamber 12 to the radial bearing 24 and the thrust bearing 25.

The radial bearing 24 and the thrust bearing 25 support the rear end of the shaft 5, and the front end of the shaft 5 is rotatably supported by a radial bearing 26.

A thrust flange 40 for transmitting the rotation of the shaft 5 to the swash plate 10 is fixed to the front end of the shaft 5, and the thrust flange 40 is provided on the inner wall surface of the front head 4 via a thrust bearing 33. It is rotatably supported. The thrust flange 40 and the swash plate 10 are connected via a link mechanism 41, and the swash plate 10 can be inclined with respect to a plane perpendicular to the shaft 5.

A winding spring 44 is mounted between the thrust flange 40 and the stopper 46, and a winding spring 47 is mounted between the stopper 45 and the stopper 48.

The link mechanism 41 includes a bracket (projection) 10e provided on the front surface 10c of the swash plate 10, a linear guide groove 10f provided on the bracket 10e,
And a rod 43 screwed to the thrust flange 40. The longitudinal axis of the guide groove 10f is inclined at a predetermined angle with respect to the front surface 10c of the swash plate 10. Rod 43
Is fitted in the guide groove 10f so as to be relatively slidable.

The shaft 5, the swash plate 10, the bracket 10e, the thrust flange 40, the rod 43, and the shoe 50 are formed of an iron-based material.
0e is subjected to a surface treatment by a gas sulfide nitriding treatment method or an electroless nickel-phosphorus-boron plating treatment method.

In the gas sulphiditriding method, N and S are diffused into steel in an atmosphere of NH 3, X gas (sulfur element gas) and N 2. The electroless nickel-phosphorus-boron plating method is a plating method for forming a nickel electroless plating film containing, for example, 0.5 to 3.0% by weight of phosphorus and 0.05 to 2.0% by weight of boron. Either treatment method can improve the wear resistance or lubrication characteristics of the swash plate 10 and the bracket 10e.

Next, the operation of the variable displacement type swash plate type compressor will be described.

When the rotational power of the vehicle-mounted engine (not shown) is transmitted to the shaft 5, the rotational force of the shaft 5 is transmitted to the swash plate 10 through the thrust flange 40 and the link mechanism 41, and the swash plate 10 rotates.

The rotation of the swash plate 10 causes the shoe 50 to move
The rotation of the swash plate 10 is converted into a linear reciprocating motion of the piston 7 because the rotation is relatively performed on the zero sliding surfaces 10a and 10c. The piston 7 reciprocates in the cylinder bore 6, and as a result, the volume in the cylinder bore 6 changes, and the suction, compression and discharge of the refrigerant gas are sequentially performed by this volume change, and the capacity of the piston according to the inclination angle of the swash plate 10 is increased. High pressure refrigerant gas is discharged. At the time of suction, the suction valve 21 opens, and low-pressure refrigerant is sucked from the suction chamber 13 into the compression chamber in the cylinder bore 6,
During discharge, the discharge valve 17 is opened, and high-pressure refrigerant is discharged from the compression chamber to the discharge chamber 12.

When the heat load decreases and the pressure regulating valve 32 closes the communication passage, and the pressure in the crank chamber 8 increases, the swash plate 10
Of the piston 7 becomes small, and as a result, the stroke amount of the piston 7 becomes small and the discharge capacity decreases.

On the other hand, when the heat load increases and the pressure regulating valve 32 opens the communication passage and the pressure in the crank chamber 8 decreases, the inclination angle of the swash plate 10 increases, and as a result, the stroke amount of the piston 7 decreases. This increases the discharge capacity.

During the above operation, the shoe 50 slides on the sliding surfaces 10a and 10c of the swash plate 10 (relative rotation), and the inner peripheral surface of the center hole 10g of the swash plate 10 slides on the outer peripheral surface of the shaft 5. And
The tip 43a of the rod 43 slides (relatively slides) in the guide groove 10f.

According to the variable displacement type swash plate type compressor of this embodiment, the swash plate 10 and the bracket 10e are subjected to the surface treatment by the gas sulfide nitriding treatment or the electroless nickel-phosphorus-boron plating treatment. In addition, wear resistance due to surface hardening is improved, and lubricity is obtained.

Further, since the swash plate 10 and the bracket 10e are subjected to the surface treatment by the gas sulphonitriding method or the electroless nickel-phosphorus-boron plating method, the sliding surfaces 10a and 10c of the swash plate 10 and the swash plate 10e are processed. Surface treatment can be performed on the central hole 10g and the bracket 10e in a single step, a uniform film is formed even with a complicated shape, and the processing temperature is low and the distortion is small, so that the polishing step after the processing is unnecessary, While the work of the surface treatment of the swash plate 10 becomes easy,
FIG. 2 is a longitudinal sectional view showing a variable displacement type swash plate type compressor according to another embodiment of the present invention. . Portions common to the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted.

In the embodiment of FIG. 1, a pair of shoes 50,
50 are arranged on both sides of the swash plate, and
Has been described in the case where the present invention is applied to a variable displacement type swash plate type compressor having a structure in which the piston is directly supported by one end 7a of the piston 7, but in the embodiment of FIG. The present invention was applied to a variable displacement swash plate type compressor having a structure in which a rod 111 was interposed.

The swash plate 110 is mounted on the shaft 5 so as to be tiltable. A shoe 150 for supporting the spherical one end 11a of the connecting rod 11 so as to be relatively rotatable is held by a retainer 53 on the sliding surface 10a of the swash plate 110. A retainer 53 is attached to the boss 10b of the swash plate 110, and the retainer 53 is supported by a lock plate 55 fixed to the boss 10b by a stopper 54.
The other end 11b of the connecting rod 11 is a piston 7
It is fixed to.

The shoe 150 is a connecting rod 1
1 and a washer 15 for supporting the rear end surface of the connecting rod 11 relatively rotatably.
And 2.

The basic operation of the variable displacement type swash plate type compressor of the embodiment of FIG. 2 is the same as that of the variable displacement type swash plate type compressor of the embodiment of FIG. 1, and the effect of the embodiment of FIG. Same as the form.

[0044]

As described above, according to the variable displacement type swash plate type compressor of the first aspect of the present invention, the abrasion resistance and lubrication characteristics due to the surface hardening of the swash plate and the projections are improved.

According to the surface treatment method of the second aspect of the present invention,
Surface treatment can be applied to both the swash plate and the projection in one step, a uniform film is formed even in a complicated shape, the wear resistance or lubrication properties are improved, and the processing temperature is low and distortion is small, Since the polishing step after the processing is not required, the work of surface treatment of the swash plate and the convex portion is facilitated, and it is not necessary to divide the swash plate into a plurality of parts, so that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a variable displacement swash plate type compressor according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a variable displacement swash plate type compressor according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 5 shaft 6 cylinder bore 7 piston 10 swash plate 10a swash plate sliding surface 10e bracket 10f guide groove 40 thrust flange 41 hinge mechanism 43 rod 43a rod tip 50 shoe

Claims (2)

[Claims] A rotating member fixed to a rotating shaft and rotating integrally with the rotating shaft; a rotating member supported by the rotating shaft so as to be tiltable, connected to the rotating member via a link mechanism, and rotating the rotating member. A swash plate that rotates integrally with the swash plate, and a piston that is connected to the swash plate via a shoe that relatively rotates on a sliding surface of the swash plate, and that linearly reciprocates in a cylinder bore as the swash plate rotates. A variable displacement type swash plate compressor, wherein the swash plate is provided with a convex portion that constitutes a part of the link mechanism, wherein the swash plate and the convex portion are formed by a gas sulfide nitriding method or an electroless nickel method. A variable displacement type swash plate type compressor, which has been subjected to a surface treatment by a phosphorus-boron plating method. A rotating member fixed to a rotating shaft and rotating integrally with the rotating shaft; a rotating member supported by the rotating shaft so as to be tiltable, connected to the rotating member via a link mechanism, and rotating the rotating member. A swash plate that rotates integrally with the swash plate, and a piston that is connected to the swash plate via a shoe that relatively rotates on a sliding surface of the swash plate, and that linearly reciprocates in a cylinder bore as the swash plate rotates. A variable displacement type swash plate compressor, wherein the swash plate is provided with a convex portion that constitutes a part of the link mechanism, wherein the swash plate and the convex portion are formed by a gas sulfide nitriding method or an electroless nickel method. A surface treatment method for a variable displacement swash plate type compressor, wherein the surface treatment is performed by a phosphorus-boron plating method.