JPH0313431B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a swash plate type compressor, and in particular, the invention relates to a swash plate type compressor, and in particular, a swash plate type compressor in which the inclination angle of the swash plate is made variable so that the compression capacity is changed by changing the inclination angle of the swash plate. The present invention relates to a variable capacity compressor that allows for variable capacity compressors.

[Prior Art] A conventional variable capacity compressor includes a housing having a cylinder block having a plurality of cylinders, a front end plate facing the cylinder block and supporting a drive shaft, and connecting the cylinder block to the front end plate. a swash plate disposed in a crank chamber formed between the cylinders and connected to the drive shaft so as to have a variable inclination angle; It has a rocking plate that reciprocates the piston, and a rotation prevention mechanism that prevents rotation of the rocking plate, and the rotation prevention mechanism has a tip inserted at a predetermined position on the outer periphery of the rocking plate. It consists of a columnar block having a vertical groove formed therein, and a guide plate whose one side is fitted into the vertical groove of the columnar block and whose both sides are rotatably supported by the front end plate and the cylinder block. By changing the inclination angle of the swash plate, the stroke of the piston changes and the compression capacity changes.
(See No. 17998).

In the conventional case, the guide plate is supported for rotation by inserting pins provided at both ends of the guide plate into holes formed in the front end plate and cylinder block, respectively.

[Problems to be solved] In the conventional case, the guide plate is supported by pins so that it can rotate. For this reason, the force acting on the guide plate acts intensively on the pin of the guide plate, resulting in the inconvenience that the pin is easily damaged.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a variable capacity compressor equipped with a rotation prevention mechanism that is not easily damaged.

[Means for Solving the Problems] According to the present invention, a housing having a cylinder block including a plurality of cylinders, a front end plate facing the cylinder block and supporting a drive shaft, and the cylinder block and A swash plate arranged in a crank chamber formed between the front end plate and connected to the drive shaft so as to have a variable inclination angle, and a swash plate that swings as the swash plate rotates and slides into the cylinder. It has a rocking plate that reciprocates the piston inserted in the piston, and a rotation prevention mechanism that prevents rotation of the rocking plate, and the rotation prevention mechanism is mounted at a predetermined position on the outer periphery of the rocking plate. A columnar block having a longitudinal groove formed at its inserted tip, and one side edge of the columnar block fitted into the longitudinal groove and both ends rotatably supported by the front end plate and the cylinder block. In a variable capacity compressor, the compression capacity is changed by changing the stroke of the piston as the inclination angle of the swash plate changes, and both ends of the guide plate are rotatable. There is obtained a variable capacity compressor characterized in that the supporting means is a disc having a longitudinal groove for receiving the end of the guide plate.

[Function] In the case of the present invention, the guide plate is rotatably supported by a disk having a vertical groove for receiving this end, so the guide plate is firmly supported.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

Referring to FIG. 1, housing 10 has a cylinder block 11 at one end. A plurality of cylinders 12 (only one is shown in FIG. 2) are formed in the cylinder block 11. The other end of the housing 10 is closed by a front end plate 13, and the front end plate 13 and the cylinder block 1 are connected to each other.
1, a crank chamber 14 is formed between the two.

A suction hole 1 is provided on the end face of the cylinder block 11.
A cylinder head 18 is installed via a valve plate 17 having a valve plate 5 and a discharge hole 16. The cylinder head 18 has a suction chamber 19 selectively connected to the cylinder 12 through the suction hole 15 and a discharge chamber 20 selectively connected to the cylinder 12 through the discharge hole 16. In addition, 21, 22
indicate the suction valve and discharge valve, respectively. The cylinder head 18 is provided with a fluid inlet 23 and an outlet 24 connected to a suction chamber 19 and a discharge chamber 20, respectively, and to an external fluid circuit (not shown).

The drive shaft 25 extends from the outside of the front end plate 13 into the crank chamber 14, and is rotatably supported by the front end plate 13 and the cylinder block 11.

A rotor 26 is fixed to the drive shaft 25 and is rotatable together with the drive shaft 25. A swash plate 27 is hingedly connected to the rotor 26 by a pin 28 . Therefore, the swash plate 27 can also rotate with the rotation of the drive shaft 25, and the angle of inclination with respect to the drive shaft 25 is variable due to the hinge connection.

A swing plate 29 is rotatably mounted on the end face of the swash plate 27 facing the cylinder block 11. A piston rod 3 is attached to the outer periphery of this rocking plate.
0 is spherically connected. A piston 31 slidably disposed within the cylinder 12 is coupled to the other end of the piston rod 30.

A radial hole 32 is formed at a lower position on the outer circumference of the rocking plate 29, and a cylindrical block 33 is disposed in the hole 32 so as to be movable in the radial direction of the rocking plate. .

Referring to FIG. 2, a vertical groove 34 is formed in the cylindrical block 33 in the axial direction from the lower end surface.

With reference to FIGS. 1 and 2, crank chamber 1
A guide plate 35 is arranged below the drive shaft 25 in parallel with the drive shaft 25, and the vertical groove 34 of the cylindrical block 33 is fitted into the guide plate 35 from its upper edge. Note that the upper edge of the guide plate 35 has a concave arc shape 36 as shown in the figure.

Both ends of the guide plate 35 are supported by the front end plate 13 and the cylinder block, respectively, and this support allows the guide plate 35 to rotate.

As shown in FIG. 2, diametrical slits 37a and 38a are formed on one side of the disks 37 and 38,
Both ends of the guide plate 35 are fitted into the slits 37a and 38a, respectively. disk 37,
Reference numeral 38 indicates circular holes 39 and 4 formed in the opposing surfaces of the cylinder block 11 and the front end plate 13.
0, respectively.

Cylindrical block 3 attached to rocking plate 29
3 and a guide plate 35 supported by the cylinder block 11 and front end plate 13, the swing plate 29 is prevented from rotating.

A communication hole 41 for communicating the crank chamber 14 and the suction chamber 19 is formed in the cylinder block 11 and the valve plate 17. A pressure sensitive chamber 42 is formed in the middle of this communication hole 41,
A bellows valve 43 is provided within this pressure sensitive chamber 42 . The bellows valve 43 has a pressure inside the crack chamber introduced into the pressure sensitive chamber 41 at a predetermined value (bellows internal pressure).
When the pressure becomes higher, the valve is opened to communicate the suction chamber 19 and the crank chamber 14, thereby lowering the pressure inside the crank chamber 14.

Note that when the internal pressure of the crank chamber 14 is high, the back pressure of the piston 31 becomes high. As a result, piston 3
The bottom dead center position of No. 1 shifts toward the top dead center, and the stroke of the piston becomes smaller. That is, the angle of inclination of the swash plate 27 and the swing plate 29 with respect to the drive shaft 25 becomes smaller (ie, closer to a right angle). In this state, the compression capacity becomes small. Conversely, when the internal pressure of the crank chamber 14 is low, the back pressure of the piston 31 is small, so for the opposite reason as described above, the stroke of the piston becomes large, and the angle of inclination of the swash plate 27 and the rocking plate 29 becomes large. , the compression capacity is large. However, the variable capacity compressor described here is just one example, and it is clear that the present invention is applicable not only to the scope of the mechanism described above.

The operation of the apparatus shown in FIG. 1 will be explained below.

When the drive shaft 25 is rotated by an external drive source (not shown), the rotor 26 and the swash plate 27 rotate together. However, since the rocking plate 29 is rotatably set on the end face of the swash plate 27 and the cylindrical block 33 provided on the rocking plate is fitted into the guide plate 35, the rocking plate 29 rotation is prevented.
Therefore, it follows the slope of the rotating swash plate 27 and swings. That is, the piston rod 30 reciprocates in the axial direction, which causes the piston 31 to reciprocate within the cylinder 12. At this time, the cylindrical block 33 is fitted into the guide plate 35, and the swing plate 29 and the swash plate 27
It reciprocates along the combination body.

As the piston 31 reciprocates within the cylinder 12, fluid is sucked from the suction chamber 19 through the suction hole 15, compressed, and discharged from the discharge hole 16 into the discharge chamber 20. That is, the fluid is compressed.

During the process of suction and discharge of fluid due to the reciprocating motion of the piston 31, fluid flows into the crank chamber from between the piston 31 and the cylinder 12. That is, blow-by gas is present. This blow-by gas increases the internal pressure of the crank chamber 14. As a result, as described above, the inclination of the swash plate 27 and the rocking plate 29 becomes smaller, and the compression capacity becomes smaller. after that,
When the internal pressure of the crank chamber 14 becomes equal to or higher than a certain pressure, the bellows valve 43 opens, and the crank chamber 14 and the suction chamber 1
9 communicates with each other. In this way, the internal pressure of the crank chamber 14 decreases, and as described above, the angle of inclination between the swash plate 27 and the rocking plate 29 increases, resulting in a large compression capacity.

When assembling this compressor, in particular, the rotation prevention mechanism must be assembled using the hole 3 of the cylinder block 11.
9, the guide plate 35 is placed in the crank chamber so that its tip is inserted into the slot 37a of the disk 37, and the cylindrical block 33 is fitted into the upper part of the guide plate 35. Then, insert the combination of the rocking plate 29 and the swash plate 27 into the housing while inserting the head of the cylindrical block 33 into the hole 32 of the rocking plate 29, and then remove the other parts. After it is assembled into the housing 10, the disc 38 is fitted to the other end of the guide plate 35, and the front end plate 13 is inserted from above into the housing 10, with the disc 38 inserted into the hole 40. This is done by attaching.

[Effects of the Invention] As described above, according to the configuration of the present invention, the guide plate is rotatably supported by the disk having the vertical groove for receiving this end, so that the support of the guide plate is strengthened. Moreover, this can be done reliably and damage to the guide plate can be prevented.

Further, in the present invention, since the guide plate is rotatably supported by the disc, the diameter of the hole that receives this disc is large, and therefore the diameter of the processing tool for forming this hole is also large. Of course it gets bigger,
For this reason, the rigidity of the processing tool is also increased, which has the effect of improving workability compared to the conventional case where a hole with a small diameter is formed to receive a pin provided on a guide plate.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a variable displacement compressor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a rotation prevention mechanism, and FIG. 3 is an exploded perspective view of a conventional rotation prevention mechanism. DESCRIPTION OF SYMBOLS 10... Housing, 11... Cylinder block, 12... Cylinder, 13... Front end plate, 14... Crank chamber, 25... Drive shaft, 27... Swash plate, 29... Rocking plate, 31... ... Piston, 33 ... Cylindrical block, 34 ... Vertical groove, 35 ... Guide plate, 37, 38 ... Disc.

Claims (1)

[Claims] 1. A housing having a cylinder block including a plurality of cylinders, a front end plate facing the cylinder block and supporting a drive shaft, and a crank chamber disposed within a crank chamber formed between the cylinder block and the front end plate. a swash plate connected to the drive shaft such that its inclination angle is variable; a oscillation plate that swings as the swash plate rotates and reciprocates a piston slidably inserted into the cylinder; a rotation prevention mechanism that prevents rotation of the rocking plate; the rotation prevention mechanism includes a columnar block having a longitudinal groove formed in its tip inserted at a predetermined position on the outer periphery of the rocking plate; , a guide plate whose one side edge is fitted into the vertical groove of the columnar block and whose both ends are rotatably supported by the front end plate and the cylinder block, and is adapted to change the inclination angle of the swash plate. Therefore, in the variable capacity compressor in which the compression capacity is changed by changing the stroke of the piston, the means for rotatably supporting both ends of the guide plate includes a vertically divided groove for receiving the ends of the guide plate. A variable capacity compressor characterized in that it is a disc having a variable capacity.