JP3277580B2 - Oscillating swash plate type variable displacement compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swash plate type variable displacement compressor used in, for example, a vehicle air conditioner.

[0002]

2. Description of the Related Art As a conventional swinging swash plate type variable displacement compressor, the present applicant has proposed, for example, the one disclosed in Japanese Patent Application No. 3-241998. In this compressor, a sphere formed at a base end of a pair of guide pins constituting a hinge mechanism is swingably connected to a lug plate fitted and fixed to a rotary shaft via a spherical bearing, and both guide pins are provided. Are slidably fitted in a pair of parallel through holes of a bearing provided on the back surface of the rotary support. The inner peripheral surface of the boss portion of the rotary support is rotatably supported by a spherical slider fitted slidably in the front-rear direction on the rotary shaft. Further, a swinging swash plate is fitted and fixed to the outer peripheral surface of the boss portion,
A piston is moored to the swing swash plate via a pair of front and rear shoes. Then, when the lug plate is rotated by the rotation of the rotating shaft, the rotating support and the swinging swash plate are swung in the front-rear direction via the hinge mechanism, and the piston is reciprocated in the cylinder bore, and is moved from the suction chamber. After the sucked refrigerant gas is compressed in the cylinder bore, it is discharged to the discharge chamber. In addition, the reciprocating stroke of the piston is changed by changing the tilt angle of the swash plate by changing the pressure difference between the crank chamber pressure acting on the rear surface of the piston and the bore pressure acting on the front surface. The capacity is controlled.

[0003]

In the above-mentioned conventional compressor, the inner peripheral surface of the boss portion of the rotary support is rotatably engaged with the spherical surface of the spherical slider guided on the rotary shaft in any direction. The swash plate receives a compression reaction force via the piston during the compression operation. For this reason, as described above, two guide pins are required to prevent the rotating support from being guided by the spherical surface of the slider and rotating by the compression reaction force, so that not only the number of parts is increased, but also manufacturing and assembly are performed. There was a problem that the work was troublesome. Particularly, since it is necessary to accurately center the pair of guide pins, there is a problem that high processing accuracy is required.

In order to prevent the swing swash plate from rotating due to the compression reaction force, a cylindrical slider is slidably fitted on a rotary shaft, and a pair of left and right connecting pins are used to rotate the cylindrical slider. Has been proposed in which the boss portions are rotatably connected. In this case, the number of the guide pins can be reduced to one.However, since two connection pins are required, the number of parts is increased, and in order to properly align the guide pins and the connection pins when assembling them. Also, high processing accuracy was required.

Further, as a hinge mechanism of a conventional compressor, a long hole is formed in a support arm provided on a lug plate, and a connection penetrates through the long hole through a bearing portion formed on the back surface of the rotary support through a connection pin. There is also proposed a pin in which a pin is supported so as to be able to reciprocate along an arc locus. (For example, 3-
However, in this hinge mechanism of the compressor, however, it is necessary to mount a cylindrical slider on the rotating shaft and connect the boss of the rotating support with a connecting pin, thereby increasing the number of parts.
The problem described above cannot be avoided. In addition, the compression reaction force acting on the swinging swash plate repeatedly acts on the support arm, the connecting pin, and the bearing portion that constitute the hinge mechanism, so that abrasion occurs due to wear, and the swinging swash plate tilts in the front-rear direction. There is a problem that the operation cannot be performed smoothly.

The object is to eliminate the above problems of the present invention, to prevent the moment other than the tilting direction of the swash plate by the compression reaction force of the piston occurring during the compression operation, the front and rear of the rocking swash plate to provide a swash plate type variable displacement compressor capable of performing the tilting operation of the rectangular direction smoothly.

[0007]

Since SUMMARY OF THE INVENTION The present invention to achieve the above object, a cylinder block which forms the shape of the plurality of cylinder bores for accommodating a piston in a housing provided, the rotation by providing a crank chamber in said housing supporting the shaft, together with the said rotating shaft to secure the lug plate, the said lug plate mounted on the tilting <br/> dynamic available-rotating supports the longitudinal direction through the hinge mechanism, the rotary support Rocking swashplate on body
The provided, wherein by rotation of the rotary shaft is swung to the wobble plate is reciprocated in the cylinder bore of the piston, a gas sucked from the suction chamber to discharge into the discharge chamber is compressed in the cylinder bore None, furthermore, the difference between the pressure in the crankcase acting on the back of the piston and the pressure in the bore acting on the front.
By changing the reciprocating stroke of the piston by changing the inclination angle of the swash plate and more adjustment of the difference in the swash plate type variable displacement compressor so as to control the discharge capacity,
A guide surface is formed on the rotation shaft, and the rotation support
A guided surface is formed on the body, and the guide surface is brought into contact with the guided surface.
In this case, the moment other than the tilt direction acting on the rotary support
It has taken a means called for supporting the cement.

[0008]

[Action] the change of the difference between the present invention bore pressure acting on the crank chamber pressure and the front acting on the back of the piston
Ri, swash plate is tilted in the longitudinal direction through the hinge mechanism, the displacement of the compressor is adjusted stroke of the piston is changed. Compression reaction force acting on the piston acts on the swash plate, the moment due to the reaction force is supported by the guide surface of the rotating shaft from the guide surface of the rotating support. Therefore <br/> Te, tilting the compression reaction force hinge mechanism acting on the rotating support
Not acting as a motor Mento other than the direction, it is possible to simplify the M o <br/> instrument supporting structure, longitudinal tilting operation of the swash plate can be smoothly performed.

[0009]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG. 1, a front housing 2 is joined and fixed to a front end surface of the center housing 1. A rear housing 3 is joined and fixed to a rear end surface of the center housing 1 via a valve plate 4. The center housing 1 is integrally formed with a cylinder block 1b having a plurality of cylinder bores 1a. A rotary shaft 6 is rotatably supported in bearings 7 and 8 in a crank chamber 5 formed in the center housing 1. A piston 9 is fitted in the cylinder bore 1a so as to be able to reciprocate . A lug plate 10 is fitted and fixed to the rotating shaft 6. Similarly, a slider 11 having a spherical surface is supported on the rotating shaft 6 so as to be able to reciprocate in the front-rear direction. A rotating support 12 is rotatably supported on the spherical surface of the slider 11. The rotating support 12 is tilted in the front-rear direction by the lug plate 10 via a hinge mechanism 13.
It is connected to whether capacity.

As shown in FIGS. 2 and 3, the hinge mechanism 13 includes a bearing 14 protruding forward near the outer periphery of the lug plate 10 and a connecting pin 15 inserted through the bearing 14 so as to be rotatable in the left-right direction. Have. The hinge mechanism 13 is inserted through an insertion hole 15a formed at an end of the connection pin 15 so as to be reciprocally slidable, and a fitting hole 12b formed in a connection portion 12a integrally formed on the back surface of the rotary support 12. And a guide pin 16 which is fitted and fixed on the guide pin 16. On the back surface of the rotary support 12, two parallel guided surfaces 12c, which are slidably contacted so as to sandwich the two guide surfaces 6a, 6a on the outer peripheral surface of the rotary shaft 6 from both left and right sides. 12d.

As shown in FIG. 1, a rotary swinging swash plate 17 is fitted and fixed to the outer peripheral portion of the rotary support 12. The rotary swinging swash plate 17 is inserted into a recess 18 formed at the base end of the piston 9 and a pair of front and rear shoes 19, 1 is inserted.
It is moored to the piston 9 via 9.

A suction chamber 21 and a discharge chamber 22 are formed in the rear housing 3 by a partition wall 20. A suction valve plate 23 having a suction valve 23a formed on the front surface of the valve plate 4 and a discharge valve plate 24 having a discharge valve 24a formed on the rear surface of the valve plate 4. A retainer 25 for regulating the open position of the discharge valve 23a is joined and fixed to the rear surface of the discharge valve plate 24.

The rear housing 3 has a capacity control valve 2
7, 28 are provided. The capacity control valve 27 opens and closes an air supply passage for supplying refrigerant gas from the discharge chamber 22 to the crank chamber 5. The other volume control valve 28 opens and closes a bleed passage that communicates with the suction chamber 21 from the crank chamber 5. The stroke of the piston 9 is changed by adjusting the pressure difference between the crank chamber pressure acting before and after the piston 9 and the suction chamber pressure to control the inclination angle of the rotary swinging swash plate 17 to thereby change the stroke of the piston 9. Is to be adjusted.

Next, the operation of the variable displacement compressor configured as described above will be described. In a state where the compressor is stopped, as shown in FIG. 1, the rotary support 17 is moved to the front side together with the slider 11 and the rotary support 12, and the tilt angle of the rotary support 17 is maximum and the maximum capacity operation is possible. In state. When an electromagnetic clutch (not shown) is turned on in this state, the rotating shaft 6 is rotated by the power of the engine.

The rotation of the rotation shaft 6 causes the lug plate 1 to rotate.
The rotation support 12 and the swinging swash plate 17 are rotated in the maximum inclined state via the bearings 0, the bearings 14, the connecting pins 15 and the guide pins 16. As a result, the piston 9 reciprocates in the cylinder bore 1a, compresses the refrigerant gas sucked from the suction chamber 21 into the cylinder bore 1a, and discharges it to the discharge chamber 22.

In the early stage of the operation of the compressor, the cooling load in the vehicle compartment is high and the suction pressure is high, so that the capacity control valve 28 is opened, and from the working chamber in the cylinder bore 1a, between the piston 9 and the inner peripheral surface of the cylinder bore. The gas blown into the crank chamber 5 is reduced to the suction chamber 21 through the bleed passage. For this reason, the pressure difference between the crank chamber pressure acting on the back surface of the piston 9 and the bore pressure acting on the front surface is large, and the rotary swing swash plate 17 is operated at the maximum inclination angle.

Thereafter, when the temperature in the vehicle interior decreases and the cooling load is reduced, and the pressure in the suction chamber 21 decreases, the displacement control valve 28 closes the bleed passage, so that the pressure in the crank chamber 5 increases. The swash plate 17 rises and the differential pressure increases.
Of the piston 9 decreases, the stroke of the piston 9 decreases,
The displacement of the compressor is reduced.

When the tilt angle of the swash plate 17 decreases from the maximum tilt angle shown in FIG. 3 as shown in FIG. 4, the rotating support 12 is guided by the spherical surface of the slider 11 and rotates. The slider 11 itself is moved forward along the rotating shaft 6, and the guide pin 16 is rotated forward about the connecting pin 15 as shown in FIG.
Move down along. The guided surfaces 12c, 12d of the rotary support 12 are left and right guide surfaces 6a, 6a of the rotary shaft 6.
And is moved forward by the sliding guide.

Further, in the operating state of the compressor, the compression pressure P acts on the front side as shown by an arrow in FIG. 5 due to the high pressure of the working chamber in the cylinder bore 1a received by the piston 9. This compression reaction force P, the swash plate 17 mode Mento M acts. This moment M is parallel to the guide surface 12c of the rotary support 12, draft internal surface 6a of the rotary shaft 6 through 12d, the 6a, it is possible to reliably receive.
As a result, by eliminating the effect of Mo Men <br/> preparative M other than the tilting direction of the hinge mechanism 13, can be prevented knitting wear of the hinge mechanism 13, it can exert a stable tilting support function.
Further, motor Mento M can easily be manufactured and assembly work by simplifying the structure for supporting the.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) In the above embodiment, the guide surfaces 6a, 6a are guided on the outer peripheral surface of the rotary shaft 6 having a circular cross section. However, as shown in FIG. Forming guide surfaces 6a, 6a in the shape of a circle, and slidingly contacting the guided surfaces 12c, 12d on the side of the rotary support 12.

(2) As shown in FIG. 7, a through hole 6b is formed in the rotating shaft 6, and a planar guide surface 6 is formed on both left and right sides of the through hole.
a, 6a, and a guide rod 31 forming a hinge mechanism is inserted into the through hole 6b, and the planar guided surfaces 31a, 31a formed on both sides thereof are connected to the guide surfaces 6a, 6a.
Sliding on

[0022]

As described above in detail, the present invention relates to a rotating shaft
The abutment between the guide surface of the rotating support and the guided surface of the rotating support causes the swash plate to swing due to the compression reaction force of the piston generated during the compression operation .
<br/> Ki out to prevent rotation of the non-tilted direction with a simple configuration Rutotomoni, that-out <br/> in that perform tilting movement operation of the swash plate smoothly.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing an embodiment in which the present invention is embodied in an oscillating swash plate type variable displacement compressor.

FIG. 2 is a cross-sectional view near a hinge mechanism.

FIG. 3 is a longitudinal sectional view of a large capacity state near a hinge mechanism.

FIG. 4 is a longitudinal sectional view of a small capacity state near a hinge mechanism.

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

FIG. 6 is a partial sectional view showing another example of the present invention.

FIG. 7 is a partial sectional view showing another example of the present invention.

[Explanation of symbols]

Reference Signs List 1 center housing, 1a cylinder bore, 1b cylinder block, 2 front housing, 3 rear housing, 5 crank chamber, 6 rotating shaft, 6a guide surface, 9
Piston, 10 lug plate, 11 slider,
12 rotating support, 12c, 12d guided surface, 13
Hinge mechanism, 14 bearings, 15 connecting pins, 16 guide pins, 17 rotation swash plate, 21 suction chamber, 22 discharge chamber.

Continued on the front page (72) Inventor Takeshi Takeshi 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) F04B 27/08 F04B 27/10 F04B 27/14

Claims (3)

(57) [Claims] 1. A provided a cylinder block in which form form a plurality of cylinder bores for accommodating a piston in a housing, supports a rotating shaft provided with a crank chamber within said housing, solid lug plate to said rotary shaft The rotating support is tilted forward and backward on the lug plate via a hinge mechanism.
While attached to whether ability swash plate to the rotary support
The provided, wherein by rotation of the rotary shaft is swung to the wobble plate is reciprocated in the cylinder bore of the piston, so as to discharge the gas sucked from the suction chamber into the compression and the discharge chamber in the cylinder bore Between the pressure in the crankcase acting on the back of the piston and the pressure in the bore acting on the front .
By changing the reciprocating stroke of the piston by changing the inclination angle of the by Ri swash plate for adjusting the difference in the swash plate type variable displacement compressor so as to control the discharge capacity, the rotary shaft Forming a guide surface and supporting the rotation
A guided surface is formed on the body, and the guide surface is brought into contact with the guided surface.
In this case, the moment other than the tilt direction acting on the rotary support
Rocking Dohasu plate type variable displacement compressor for supporting the cement. 2. The at least one of the guide surface and the guided surface.
The swinging oblique according to claim 1, wherein is a plane extending in the axial direction.
Plate type variable capacity compressor. 3. The guide surface and the guided surface are axes of the rotation shaft.
The pair according to claim 1 or 2, which is provided for the line.
Swash plate type variable displacement compressor.