JPH0455267Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a swash plate type compressor, in particular, the inclination angle of the swash plate is made variable, and 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 swash plate type compressor is known in which a swash plate is rotated to cause a oscillating plate to swing and reciprocate a piston. In such a swash plate type compressor, in order to change the compression capacity, the angle of the swash plate with respect to the drive shaft is variable, and the compression capacity can be controlled by controlling the inclination angle of the swash plate. A variable compressor is disclosed, for example, in Japanese Patent Laid-Open No. 77578/1983.

By the way, in a swash plate type compressor, it is necessary to prevent the rotation of the oscillating plate. Such a rocking plate rotation prevention mechanism is shown, for example, in Japanese Patent Application No. 62-36444.

The structure of the compressor and rotation prevention mechanism will be schematically explained with reference to FIGS. 2 and 3.

Referring to FIG. 2, housing 10 has a cylinder block 11 at one end. A plurality of cylinders 12 (only one is shown in the figure) 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 surface of the swash plate 27 facing the cylinder block 11 using a boss 271. A piston rod 30 is ball-coupled to the outer periphery of the swing plate 29. At the other end of the piston rod 30 is a cylinder 1.
A piston 31 is coupled to the piston 2, which is slidably provided within the piston 2.

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. 3, a vertical groove 34 is formed in the cylindrical block 33 in the axial direction from the lower end surface.

With reference to FIGS. 2 and 3, 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 from the upper edge of the guide plate 35. The upper edge of the guide plate 35 has an arcuate shape 36 with a downward convex portion 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. 3, diametrical slits 37a, 38a are formed on one side of the disks 37, 38, and guide plates 35 are formed in the slits 37a, 38a.
Both ends are fitted. 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 33 attached to rocking plate 29
and the guide plate 35 supported by the cylinder block 11 and the front end plate 13,
Rotation of the swing plate 29 is prevented.

[Problems to be Solved by the Invention] In this type of compressor, the guide plate 35 receives the force that prevents the rotation of the rocking plate 29 due to compression.
This rotation blocking force varies due to variations in force that occur during suction, compression, and discharge operations of the square piston. Therefore, fluctuations in the rotation blocking force become a source of vibration, and the guide plate 35 - discs 37, 38 - cylinder block 1
1 (front end plate 13), which causes an increase in vibration and noise in various parts.

Moreover, the vertical grooves 37a and 3 are simply provided in the discs 37 and 38.
8a, the alignment accuracy between the guide plate 35 and the discs 37, 38 is poor, and the cylinder block 11 and front end plate 13
It is difficult to assemble.

Therefore, the technical object of the present invention is to provide a variable capacity compressor that can suppress as much as possible the generation of vibrations caused by the diaphragm and its rotation prevention mechanism.

Another object of the present invention is to provide a variable capacity compressor with improved ease of assembling a rotation prevention mechanism.

[Means for Solving the Problems] In the present invention, the rotation prevention mechanism is attached at a predetermined position on the outer periphery of the rocking plate so as to be movable in the radial direction, and a vertical groove is formed at the tip. from a columnar block and 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 holders provided on the front end plate and the cylinder block, respectively; The holder is characterized in that a cylindrical block made of a resin material is provided with a square hole of a predetermined depth into which the guide plate is inserted.

[Function] With this structure, the resin holder absorbs vibrations traveling from the rocking plate to the cylinder block or front end plate via the guide plate because it is made of resin. Further, the guide plate is attached to the cylinder block and the front end plate in a state in which the guide plate is attached in advance.

[Example] Examples of the present invention will be described below.

FIG. 1 shows the main parts of the present invention, and the parts not shown are the same as FIG. 2. In the present invention, the holder 4 serves as a support member for the guide plate 35.
1 and 42 are made of a resin material (for example, polyimide or polyamide) into a cylindrical block, and the part into which the guide plate 35 is inserted is formed into a square hole 42 of a predetermined depth.
a (the holder 41 is not shown).
This is done so that both ends of the guide plate 35 do not protrude from the square holes of the holders 41 and 42, and also because resin material has a lower transmission rate of high frequency components of vibration than metal material. This is due to the fact that we focused on Moreover, the assembly of the guide plate 35 to the main body is as follows:
This is done after attaching holders 41 and 42 to both ends.

[Effects of the invention] According to the invention, by using a resin material as the holder of the guide plate in the rocking plate rotation prevention mechanism, the transmission of vibrations is prevented as much as possible, thereby reducing the generation of vibrations and noise in the compressor. can be suppressed.
Further, since both ends of the guide plate are fitted into the square holes of the holder, the fitted portions of the guide plate do not protrude outside the holder. Therefore, the guide plate does not come into contact with the cylinder block or the front end plate, which has the effect of suppressing vibration. In addition, since the holders can be attached to both ends of the guide plate before it can be assembled into the main body, ease of assembly to the cylinder block and front end plate is improved.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of the main parts of the present invention, Figure 2 is a sectional view of the main parts of a variable displacement compressor to which the present invention is applied, and Figure 3 is the same as that already proposed in Figure 2. FIG. 3 is an exploded perspective view of the rocking plate 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, 4
1,42...Holder.

Claims (1)

[Claims for Utility Model Registration] 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 a housing formed between the cylinder block and the front end plate. a swash plate disposed in a crank chamber and attached to the drive shaft so as to have a variable inclination angle; a swash plate that swings as the swash plate rotates to cause the piston to reciprocate within the cylinder; A variable displacement compressor comprising: a rotation prevention mechanism that prevents rotation of a plate, and a stroke of the piston changes according to a change in an inclination angle of the swash plate, and the compression capacity changes. The columnar block is inserted into a predetermined position on the outer periphery of the rocking plate and has a vertical groove formed at its tip, one side edge is fitted into the vertical groove of the columnar block, and both ends are fitted. and a guide plate rotatably supported by holders provided on the fluorocarbon, the end plate, and the cylinder block, respectively, and the holder has a cylindrical block made of a resin material with a predetermined depth for inserting the guide plate. A variable capacity compressor characterized by having a square hole.