JP2002349429A - Variable displacement compressor and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain weight waving and a cost reduction of a rotor, in a variable displacement compressor. SOLUTION: A rotor 7 is constituted of a base board part 22 secured to a drive shaft, a link part 23 constituting partly a hinge mechanism, and a weight part 24 for center of gravity position adjustment adjusting the center of gravity so as to be conformed to a rotational axial line. This rotor 7 is integrally formed by press molding from a sheet of plate material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement compressor used in, for example, a vehicle air conditioner and a method of manufacturing the same.

[0002]

2. Description of the Related Art A variable displacement compressor is disclosed in, for example,
No. 1-264371. FIG. 8 shows a single-headed piston type variable displacement compressor described in the above publication. A swash plate 102 as a swash plate is slidably mounted on a drive shaft 101 rotated from a vehicle engine via a clutch in a state of being inclined,
The rotation of the drive shaft 101 is performed by a swash plate 102 via a hinge mechanism 104 from a rotor 103 fixed to the drive shaft 101.
Is transmitted to A piston 106 is connected to the swash plate 102 via a shoe 105, and the piston 106 reciprocates in a cylinder bore 107 to suck, compress, and discharge refrigerant gas in the cylinder bore 107. Further, the swash plate 102 is configured to be able to change the tilt angle while sliding on the drive shaft 101. By changing the tilt angle, the stroke of the piston 106 is changed, and the discharge capacity is adjusted. In addition, the rotor 103
Base part 108 as a fixed function part for drive shaft 101
And a link part 109 as a hinge function part that forms a part of the hinge mechanism 104 and transmits torque, and a weight part 110 that adjusts the weight balance so that the center of gravity coincides with the rotation axis. Also, the hinge mechanism 104
Is composed of a link portion 109 of the rotor 103 and a hinge pin 111 provided on the swash plate 102.

[0003]

In the variable displacement compressor as described above, the conventional rotor 103 has the above-described base portion 108, link portion 109, and weight portion 110 formed of a single member. It is formed by casting. In such a molding method by casting, since it is not possible to form a complicated shape or a thin-walled shape, for example, it is inevitable that there is excess thickness in the vicinity of the protruding and formed link portion 109. Large weight was caused. Weight portion 110 provided on rotor 103
The rotor 103 becomes heavier in proportion to the weight of the arm portion 109, so that the rotor 103 is also made heavier. As described above, integrally forming the rotor 103 by casting has caused an increase in the weight and an increase in the size of the rotor 103. Also, after forming by casting, the link portion 1
For example, it is necessary to cut the guide hole 109a of No. 09 and the like, and it takes time to process the rotor 103, and there is also a problem that the cost is high in terms of both the material and the production.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce the weight and cost of a rotor in a variable displacement compressor. It is to plan.

[0005]

In order to achieve the above object, a variable displacement compressor according to the present invention has a configuration as described in each of the claims. In the variable displacement compressor according to the first aspect, the rotor is formed of a plate formed by pressing, and the base portion fixed to the drive shaft and the link portion forming a part of the hinge mechanism are integrally formed. Configuration. Therefore, according to the first aspect of the present invention, it is possible to increase the strength and weight of the rotor by using an appropriate plate material, and to eliminate the excess thickness as seen in a conventional casting. Weight reduction becomes possible. In addition, since a plate material is used as a material and can be formed by pressing, manufacturing costs can be reduced because cutting work can be minimized, manufacturing time can be shortened, and the like. Further, since the rotor is formed of one part by pressing, a joining step is not required and productivity is improved as compared with a configuration in which the rotor is divided into a plurality of parts and then manufactured, and then joined to each other.

In the variable displacement compressor according to the second aspect, the rotor is provided with a counter function for adjusting the position of the center of gravity for adjusting the center of gravity so as to coincide with the rotation axis. Thereby, stable rotation of the rotor is ensured.

In the variable displacement compressor according to the third aspect, the link portion is bent at a predetermined angle with respect to the flat portion of the base portion so that at least a part of the link portion enters the projection plane of the base portion. It is configured to be upright. This makes it possible to reduce the size of the rotor in the radial direction and, when the other of the hinge mechanisms is composed of pins, to obtain a degree of freedom in setting the relative position with respect to the pins.

In the variable displacement compressor according to the fourth aspect, the counter function is constituted by a hole formed in the base portion. Thus, by changing the position or size of the hole, the position of the center of gravity can be easily adjusted, and the weight of the rotor can be reduced by the amount provided with the hole.

In the variable displacement compressor according to the fifth aspect, the counter function is constituted by a weight portion formed on the opposite side of the arm portion with respect to the rotation axis of the base portion. The weight portion can be formed by, for example, applying a process of projecting the outer shape of the base portion to the outer peripheral side, increasing the thickness of the base portion, folding the periphery, or the like.

Further, according to the method of manufacturing a variable displacement compressor according to claims 6 to 9, for example, a plate material such as a cold-rolled steel plate or carbon steel for machine structure is prepared and punched out by a press. By performing processing such as bending and drawing, it is possible to easily manufacture a rotor that is lighter than that obtained by casting. By using the plate material, the shape of the finished product can be approximated only by press working, so that the number of man-hours for cutting can be reduced.
Also, since the link part is molded integrally with the base part,
The number of components is reduced to only one, and the number of molding steps and the number of joining steps after molding can be reduced, for example, as compared with the case where separate molding is performed for each part.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 1, the front housing 1 is joined to a front end surface of a cylinder block 2. The rear housing 3 is joined to a rear end surface of the cylinder block 2 via a valve plate 4. The front housing 1, the cylinder block 2, and the rear housing 3 constitute a housing of the compressor. The crank chamber 5 is formed so as to be surrounded by the front housing 1 and the cylinder block 2. The drive shaft 6 is
It is supported rotatably between the front housing 1 and the cylinder block 2 and penetrates through the crank chamber 5. The drive shaft 6 is connected to a vehicle engine (not shown) as an external drive source via a clutch mechanism such as an electromagnetic clutch. Therefore, the drive shaft 6 is rotationally driven by the connection of the clutch mechanism when the vehicle engine is started.

A rotor 7 is fixedly fixed to the drive shaft 6 so as to be integrally rotatable in the crank chamber 5. The swash plate 8
The drive shaft 6 is housed in the crank chamber 5 in a state where the drive shaft 6 is inserted through an insertion hole 8 a penetrating through the center. Rotor 7
And a swash plate 8, a hinge mechanism 20 is interposed,
Both are connected. The hinge mechanism 20 includes a link 23 provided on the rotor 7 and a hinge pin 9 provided on the swash plate 8 side.

In the cylinder block 2, a plurality of cylinder bores 2a are formed at predetermined intervals around the axis L of the drive shaft 6, and the tip of the single-headed piston 11 is
Is housed in The rear end of the piston 11 is moored to the outer periphery of the swash plate 8 via a pair of shoes 12. Therefore, the rotational motion of the drive shaft 6 is transmitted through the rotor 7, the hinge mechanism 20, the swash plate 8 and the shoe 12 to the piston 11.
The piston 11 reciprocates in the cylinder bore 2a as the swash plate 8 rotates.

The suction chamber 3a and the discharge chamber 3b are separately arranged in the rear housing 3. Suction port 4
a, the suction valve 4b, the discharge port 4c, and the discharge valve 4d are formed on the valve plate 4, respectively. The refrigerant gas in the suction chamber 3a is sucked into the cylinder bore 2a via the suction port 4a and the suction valve 4b by moving from the top dead center side of the piston 11 to the bottom dead center side. Cylinder bore 2
The refrigerant gas sucked into a is compressed to a predetermined pressure by moving from the bottom dead center side of the piston 11 to the top dead center side, and is discharged to the discharge chamber 3b through the discharge port 4c and the discharge valve 4d. Is done.

The bleed passage 15 includes a crank chamber 5 and a suction chamber 3a.
And connect. The air supply passage 16 connects the discharge chamber 3 b and the crank chamber 5. The capacity control valve 17 which is an electromagnetic valve is interposed on the air supply passage 16. The opening degree of the air supply passage 16 is adjusted by the capacity control valve 17, the pressure of the crank chamber 5 is changed, and the crank chamber 5 acting before and after the piston 11 is changed.
And the pressure of the cylinder bore 2a is adjusted.
As a result, the inclination angle of the swash plate 8 is changed, the stroke amount of the piston 11 is changed, and the discharge capacity is adjusted.

Next, the structure of the rotor 7, which is a feature of the present embodiment, will be described with reference to FIGS.
The rotor 7 includes a base portion 22 fixed to the drive shaft 6, a link portion 23, and a weight portion 24 for offsetting the load imbalance of the rotor 7 by the link portion 23. It is formed integrally from a plate material (plate) such as carbon steel for use (S35C, S45C). The base part 22 has a through hole 22a at the center.
And is fixedly fastened to the drive shaft 6 inserted through the through-hole 22a so as to be integrally rotatable.
The through-hole 22a is formed in a cylindrical portion that extends rearward along the drive shaft 6 from the center of the base portion 22, that is, a boss portion 22c. A thrust bearing 25 is interposed between the front surface of the base 22 and the front housing 1. The thrust bearing 25 surrounds the drive shaft 6.
The compression reaction force generated by the reciprocating operation of the piston 11 is transmitted to the front housing 1 via the piston 11, the shoe 12, the swash plate 8, the hinge mechanism 20, and the thrust bearing 25.
It is accepted by.

A link portion 23 which constitutes one of the hinge mechanisms 20 has a piston 1 on the rear upper portion of the base portion 22.
The first swash plate 8 defining the top clearance is provided at a position corresponding to the top dead center corresponding position D. Link part 23
On both left and right sides straddling the axis L of the drive shaft 6, are bent from the left and right edges of the outer peripheral upper edge of the base portion 22 to the rear side, respectively, and stand substantially at right angles. Further, the left and right link portions 23 are formed in a substantially U-shape in which the front end side is inclined obliquely downward, whereby the left and right link portions 23 are disposed so as to enter the projection plane of the base portion 22. In this case, the swash plate 8 that constitutes the other of the hinge mechanism 20 is formed by arranging the link part 23 in the projection plane of the base part 22.
The relative position with the hinge pin 9 on the side can be easily set, and the rotor 7 can be made compact in the outer peripheral direction. A long hole 26 is formed in the link portion 23.

The weight portion 24 is formed integrally with the lower portion of the rear surface of the base portion 22. Since the link portion 23 is provided on the upper side of the rotor 7, the center of gravity of the rotor 7 is deviated above the axis L of the drive shaft 6, which is the center of rotation. In order to eliminate the bias, the weight portion 24 is provided below the axis L, that is, at the lower end of the rotor 7 opposite to the link portion 23. Weight part 24
Adjustment of the center of gravity by
Alternatively, it can be performed by bending the periphery. In the present embodiment, a plurality of holes 27 are provided on the link portion 23 side of the base portion 22, and the position of the center of gravity is adjusted by the correlation between the position and size of the holes 27 and the shape of the weight portion 24. Has been made. That is, in the present embodiment, by providing the weight portion 24 and the hole 27 in the rotor 7, a counter function for adjusting the position of the center of gravity of the rotor 7 is provided. Thereby, the center of gravity of the rotor 7 is adjusted to coincide with the rotation axis (the axis L of the drive shaft 6).

Next, the swash plate 8 and the pin 9 constituting the other of the hinge mechanism 20 will be described. As shown in FIG. 1, the swash plate 8 has a substantially disk shape, and an insertion hole 8a is provided in the center, and the drive shaft 6 is inserted into the insertion hole 8a in a tiltable manner. On the front surface of the swash plate 8, a protrusion 8b protrudes toward the rotor 7, and a hinge pin 9 is attached to a tip of the protrusion 8b. The hinge pin 9 is slidably engaged with the long hole 26 of the link part 23. Therefore, the swash plate 8 has a slide guide relationship with the long hole 26 of the link portion 23 and an insertion hole 8 a formed by the drive shaft 6.
, Can be slid with respect to the drive shaft 6 while tilting in the direction of the axis L thereof.

Next, a method of manufacturing the rotor 7 by press working will be described with reference to FIGS. 3 (A) to 3 (C). First, as a first step, as shown in FIG. 3A, a cold-rolled steel sheet or carbon steel for machine structure (S35C, S45
A plate material W having required dimensions such as C) is prepared. Then the second
As a process, as shown in FIG. 3B, an intermediate product A is formed by punching from the prepared plate material W. This intermediate product A has a base 22 having a circular hole in the center,
It has a link portion 23 extending horizontally continuously from the upper left and right sides of the base portion 22 and a weight portion 24 extending over an area of approximately 180 degrees below the base portion 22. A hole 27 is provided in the link portion 23 side, and the link portion 2
3 has a flat plate shape having a long hole 26 respectively. In this case, there is no problem even if the process of cutting out the plate material W into a predetermined outer shape and the process of making holes are separately performed.

Next, as a third step, as shown in FIG. 3 (C), a drawing process is applied to the periphery of the hole of the base portion 22 in the intermediate product A, whereby the through-hole extending at a predetermined length toward the rear surface side. A boss portion 22c having a hole 22a is formed. Next, as a fourth step, as shown in FIG. 3D, bending processing is performed on the left and right link portions 23, and the link portions 23 are bent toward the rear side of the base portion 22. Thus, the rotor 7 having a predetermined shape is formed by press working. In the molding process of the intermediate product A, the outer shape of the weight portion 24 is
It is formed in a semicircular shape centered on the axis. On the other hand, the link portion 23 extends outward from an extension of the outline of the weight portion 24 (indicated by a two-dot chain line in the figure). Also,
A cut A1 is provided from the outer periphery of the base portion 22 toward the extension base of the left and right link portions 23, whereby the bent portion of the link portion 23 is set at a position close to the extension of the outline of the weight portion 24. . For this reason, bending can be performed easily. Further, the link portion 23 is formed in a substantially U-shape, and in the bent state, the base portion 22 is formed.
Extend toward the center in the projection plane. As a result, the required engagement length with the hinge pin 9 can be easily secured.

The rotor 7 after press forming has a sliding surface, such as a long hole 26 of the link portion 23, an inner peripheral surface of the through hole 22a, a contact surface 22b of the thrust bearing 25, and the like. Surface treatment is applied to improve strength and abrasion resistance.

According to the present embodiment configured as described above, the rotor 7 including the base portion 22, the link portion 23, and the weight portion 24 is formed by pressing a cold-rollable steel plate or carbon steel for machine structure. By integrally forming using a plate material such as this, it is possible to achieve high strength and light weight of itself, and it is possible to eliminate extra thickness which is inevitable in integral molding by casting etc., and to reduce weight. Can be planned. In addition, costs can be reduced by using a plate material as a raw material, minimizing cutting work due to forming by pressing, shortening a manufacturing time, and the like. Also, by using a plate material,
Since the shape of the finished product can be approached only by pressing, the man-hour for cutting can be reduced. In addition, the rotor 7 includes a base 22,
Since the link part 23 and the weight part 24 are integrally formed, the number of parts is only one point. For example, the number of molding steps and the number of joining steps after molding can be reduced as compared with the case where separate molding is performed for each part. .

The present invention is not limited to the above-described embodiment, but can be appropriately modified without departing from the gist of the present invention. Regarding the hinge mechanism 20, for example, as shown in FIGS. 4 and 5, the left and right link portions 23 of the rotor 7 are each bent into a C shape, and the spherical portion 9a of the hinge pin 9 provided on the swash plate 8 side is formed. Engage. In addition,
The state before bending is shown by a virtual line. Also in this configuration, substantially the same operation and effect as the above-described embodiment can be exerted. 6 and 7, the link portion 23 is formed in a cylindrical shape and the spherical portion 9a of the hinge pin 9 provided on the swash plate 8 side is provided.
Is engaged. In this case, the link portion 23 before bending is used.
Is set to extend upward as indicated by a virtual line. Also in this configuration, substantially the same operation and effect as in the first embodiment can be exerted.

In the above-described embodiment, the rotor 7
The counter function for adjusting the position of the center of gravity is constituted by a combination of the weight portion 24 provided on the lower side of the base portion 22 and the hole 27 provided on the base portion 22. Either one may be constituted. In short, the counter function does not need to have a mode in which the weight portion 24 is provided in a specific area of the rotor 7 or the form in which the punching hole 27 is provided. It is enough if it is adjusted. The direction and position of bending when setting the link portion 23 can be arbitrarily changed. In the illustrated embodiment, the bending portion extends outside the base end portion 22 and is bent inward. Although it was an aspect,
It may be formed so as to be cut and raised in the plane of the base portion 22.

[0026]

As described in detail above, according to the present invention,
In the variable displacement compressor, the weight of the rotor can be reduced and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a variable displacement compressor.

FIG. 2 is a front view of a rotor.

FIG. 3 is an explanatory diagram of a rotor manufacturing process.

FIG. 4 is a front view showing a modification of the hinge mechanism.

FIG. 5 is a plan view schematically showing the hinge mechanism of FIG.

FIG. 6 is a front view showing another modification of the hinge mechanism.

FIG. 7 is a plan view schematically showing the hinge mechanism of FIG.

FIG. 8 is a sectional view showing a conventional technique.

[Explanation of symbols]

 Reference Signs List 6 Drive shaft 7 Rotor 8 Swash plate 9 Hinge pin 20 Hinge mechanism 22 Base part 23 Link part 24 Weight part 27 Hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takenori Sawa 2-1-1, Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Hirohiko Tanaka 2-1-1, Toyota-cho, Kariya-shi, Aichi Pref. F-term in Toyota Industries Corporation (Reference) 3H076 AA06 BB50 CC20 CC99

Claims (9)

[Claims] A drive shaft, a swash plate attached to the drive shaft in an inclined state, a piston coupled to the swash plate so as to reciprocate in a cylinder bore by rotation of the swash plate, A rotor fixed to a drive shaft, and a hinge mechanism provided between the rotor and the swash plate, the hinge mechanism connecting the swash plate to the rotor so that the swash plate can be tilted and transmit torque. A variable displacement compressor in which the stroke of the piston changes in accordance with a change in the inclination angle of the rotor, wherein the rotor is formed of a plate formed by pressing, and includes a base portion fixed to a drive shaft and the hinge mechanism. A variable displacement compressor characterized in that a link part forming a part thereof is integrally formed. 2. The variable displacement compressor according to claim 1, wherein the rotor is provided with a counter function for adjusting the position of the center of gravity for adjusting the center of gravity to coincide with the rotation axis. Characteristic variable displacement compressor. 3. The variable displacement compressor according to claim 1, wherein the link portion is bent at a predetermined angle with respect to a plane portion of the base portion, and at least a part of the link portion is bent. A variable displacement compressor characterized by being erected so as to enter into a projection plane of (1). 4. The variable displacement compressor according to claim 2, wherein said counter function is constituted by a hole formed in said base portion. 5. The variable displacement compressor according to claim 2, wherein the counter function is constituted by a weight portion formed on the opposite side of the link portion with respect to a rotation axis of the base portion. A variable displacement compressor. 6. A drive shaft, a swash plate attached to the drive shaft in an inclined state, a piston connected to reciprocate in a cylinder bore by rotation of the swash plate with respect to the swash plate, A rotor fixed to a drive shaft, and a hinge mechanism provided between the rotor and the swash plate, the hinge mechanism connecting the swash plate to the rotor so that the swash plate can be tilted and transmit torque. A method of manufacturing a variable displacement compressor in which the stroke of the piston changes in accordance with a change in the inclination angle of the base, the base being fixable to the drive shaft by applying a pressing process to one plate. A method of manufacturing a variable displacement compressor, wherein a link part forming a part of the hinge mechanism is integrally formed. 7. A method of manufacturing a variable displacement compressor according to claim 6, further comprising the step of forming a hole for adjusting the position of the center of gravity in the base portion. Production method. 8. The method for manufacturing a variable displacement compressor according to claim 6, further comprising the step of forming a weight portion on the opposite side of the link portion across the rotation axis of the base portion. A method for manufacturing a variable displacement compressor. 9. The method for manufacturing a variable displacement compressor according to claim 6, wherein the link portion is punched out while extending outward from an outer periphery of the base portion. A method for manufacturing a variable displacement compressor, characterized in that, after being bent from its extending base portion, it is formed so as to enter the projection plane of the base portion.