JPH0210314Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a variable displacement wobble plate compressor used for compressing refrigerant gas in vehicle air conditioners, etc., and in particular, its maximum discharge capacity can be adjusted. The present invention relates to a variable capacity rocking plate compressor.

(Prior Art and its Problems) Conventionally, a rotation holding member is integrated with a drive shaft and rotates together with the drive shaft, and a swing plate is rotated along with the drive shaft to swing along the axial direction of the drive shaft. a swing plate mounting member, the discharge capacity is made variable by controlling the inclination angle of the swing plate integrally with the swing plate mounting member to change the stroke amount of the piston; A variable displacement wobble plate compressor is known that is configured such that the stroke amount of the piston is maximized by a member coming into contact with the rotation holding member.

However, with conventional compressors of this type, the maximum discharge capacity, which determines the maximum cooling capacity of the air conditioner, depends on the conditions of the vehicle in which the compressor is installed, that is, the temperature in the area where the vehicle is used is extremely high. It differs depending on whether or not the vehicle is large or not. In such cases, conventional compressors do not have a mechanism to easily adjust their maximum discharge capacity, so it is necessary to manufacture various compressors with different maximum discharge capacities depending on the vehicle conditions, or to adjust the maximum discharge capacity depending on the vehicle conditions. Each time there was a difference, the contact surface between the rotation holding member and the rocking plate mounting member had to be machined to adjust the maximum stroke amount of the piston, which resulted in an increase in manufacturing costs. .

(Purpose of the invention) The present invention was made in consideration of the above circumstances, and is a variable displacement type shaker that can reliably adjust the maximum discharge volume with a simple configuration without increasing the manufacturing cost. The purpose of the present invention is to provide a moving plate compressor.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a rotation holding member that is integrated with a drive shaft and rotates together with the drive shaft, and a rocking plate that rotates together with the drive shaft and supports the drive shaft. and a rocking plate mounting member that swings along the axial direction of the rocking plate, and by controlling the inclination angle of the rocking plate integrally with the rocking plate mounting member to change the stroke amount of the piston, the discharge capacity can be changed. is variable, and the variable displacement wobble plate compressor is configured such that the stroke amount of the piston is maximized when the wobble plate mounting member comes into contact with the rotation holding member. An adjusting member for adjusting the maximum stroke amount of the piston is provided between the abutting surfaces of the piston and the rotation holding member.

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

FIG. 1 shows a variable capacity oscillating plate compressor showing a first embodiment of the present invention. In the figure, 1 is the housing of the compressor, and the housing 1 is the cylinder block 2.
A cylinder head 4 is airtightly attached to one end surface of the cylinder block 2 (the left end surface in the figure) via a valve plate 3, and a cylinder head 4 is airtightly attached to the other end surface of the cylinder block 2 (the right end surface in the figure). and a head member 5. The housing 1
A crank chamber 6 is defined inside by the end surface of the cylinder block 2 on the side of the head member 5, and the inner circumferential wall and inner surface of the head member 5.
The cylinder block 2 has a plurality of cylinders arranged at predetermined intervals in the circumferential direction, centered on the drive shaft 7 disposed substantially along the center line of the housing 1, and with the axis parallel to that of the drive shaft 7. A number of cylinders 8 are provided, and a piston 9 is slidably fitted into each cylinder 8.

One end surface of the cylinder head 4 (left end surface in the figure)
A discharge port 4a through which compressed refrigerant gas is discharged and an insertion hole 4b for a pressure regulating screw 11 which adjusts the set pressure of the pressure regulating valve 10 are respectively formed in the opening. A discharge chamber 12 is formed approximately in the center of the cylinder head 4, and a cover 13 is provided in the discharge chamber 12 to cover the discharge port 3a formed in the valve plate 3. The discharge port 3 is connected to the discharge port 3 through a hole 13a drilled in the center.
a and the discharge chamber 12 are communicated with each other. The discharge port 3a is provided with a discharge valve 14, and the discharge valve 14 is screwed into a small diameter hole 15c of a center hole 15, which will be described later, provided in the cylinder block 2. A suction chamber 16 is formed on the outer peripheral side of the discharge chamber 12, and the suction chamber 16 communicates with the cylinder 8 through a suction port 3b formed in the valve plate 3. Note that a suction valve 47 is provided in the suction port 3b.

The suction chamber 16 is connected to an outlet of an evaporator of an air conditioner (not shown) through an inlet (not shown).
The discharge chambers 12 are respectively connected to inlets of condensers (not shown) via the discharge ports 4a.

A center hole 15 consisting of a large diameter hole 15a, a medium diameter hole 15b, and a small diameter hole 15c is concentrically bored in approximately the center of the cylinder block 2 from the head member 5 side toward the cylinder head 4 side. has been done. A bearing portion 17 of the drive shaft 7 is accommodated in the medium diameter hole 15b of the center hole 15.

A housing hole 18 is formed in the cylinder block 2, and a valve body 10a and a base plate 10 are inserted into the housing hole 18.
b, a bellows 10c interposed between the substrate 10b and the valve body 10a, and a cylindrical body 1 housing these.
The pressure regulating valve 10 constituted by 0d is housed therein. The pressure regulating valve 10 is a normally open solenoid valve, is provided between the discharge chamber (high pressure chamber) 12 and the crank chamber 6, and is connected to the pressure regulating screw 1.
1 adjusts the set pressure, and is electrically connected to the output part of an air control unit (not shown), and the opening degree of the valve body 10a is controlled by a signal from the air control unit, thereby opening the crank chamber. 6 pressure is controlled.

The drive shaft 7 has an end on the cylinder head 4 side rotatably supported in a medium diameter hole 15b of the center hole 15 of the cylinder block 2 via a bearing 17, and an end on the head member 5 side. is rotatably supported in the center hole 19 of the head member 5 via a bearing portion 20. The shaft end of the drive shaft 7 on the head member 5 side is located in a protruding cylindrical portion at the center of the outer end surface of the head member 5, and a clutch (not shown) and a pulley (not shown) are attached to the outer shaft end. Connected. The pulley is a drive belt (not shown) attached to the pulley on the output shaft side of the vehicle engine (not shown).
The rotation of the engine is transmitted to the drive shaft 7.

A rotation holding member 22 that transmits the rotation of the drive shaft 7 to the rocking plate mounting member 21 is fitted on the outer peripheral surface of the drive shaft 7 on the head member 5 side, and the rotation holding member 22 supports a thrust bearing device 23. It is supported by the head member 5 via the head member 5. The rotation holding member 2
The lower portions of the opposing surfaces of the swing plate mounting member 2 and the rocking plate mounting member 21 are rotatably coupled via a link arm 24. That is, the link arm 24
One end is rotatably attached to the lower side of one side of the rotation holding member 22 by a pin 25, and the other end is rotatably attached to the lower side of one side of the swing plate mounting member 21 by a pin 26. combined.

The swing plate mounting member 2 of the rotation holding member 22
An adjustment plate (adjustment member) 27 for determining the maximum discharge capacity of the compressor is fixed at a predetermined position on the upper side of the surface facing the compressor 1 . Approximately at the center of the adjustment plate 27 is a hemispherical protrusion 28, and when the swing plate mounting member 21 is rotated to the maximum in the clockwise direction in FIG. A predetermined position on the upper side of the surface of the moving plate mounting member 21 facing the rotation holding member 22 comes into contact with the protrusion 28, thereby limiting the maximum tilt position of the swinging plate 29. By limiting the maximum stroke amount of the piston 9, the maximum displacement of the compressor is determined. Therefore, the maximum discharge capacity of the compressor is inversely proportional to the thickness of the adjustment plate 28.

The center hole 21a of the rocking plate mounting member 21 is loosely fitted around the outer periphery of the drive shaft 7, and a hinge ball is fitted around the outer periphery of the approximately intermediate portion of the drive shaft 7 so as to be slidable in the axial direction. It is in sliding contact with the outer periphery of 30. The hinge ball 30 and the rotation holding member 22
A wavy spring 31 is interposed on the outer periphery of the drive shaft 7 between the cylinder block 2 and the cylinder block 2, and biases the hinge ball 30 toward the cylinder block 2 (leftward in the figure). Further, a stopper 32 is provided on the drive shaft 7 on the side of the cylinder block 2 from the hinge ball 30.
A plurality of leaf springs 33 and a plurality of coil springs 34 are successively interposed on the outer periphery of the drive shaft 7 between the stopper 32 and the hinge ball 30, and the hinge ball 30 is connected to the head member 5. side (right side in the figure).

The swing plate mounting member 21 is connected to the swing plate 29 via a bearing portion 35 and thrust bearing devices 36 and 37.
is rotatably provided, and the thrust bearing device 3
6 and 37 are fixed to the swing plate mounting member 21 by a bearing holding plate 38. The tip 29a of the rocking plate 29 facing the piston 9 is rotatably connected to the piston 9 by a piston rod 39 having balls 39a and 39b at both ends, and the piston 9 As the plate 29 swings, the piston rod 39 reciprocates in the axial direction within the cylinder 8, thereby sucking and compressing the refrigerant gas.

One restrant pin 40 is provided on the swing plate 29 from near the center to the outer end thereof,
A plate-shaped slipper 41 is rotatably provided on the outer periphery of the restrant pin 40 near its outer end.

On the inner circumferential surface of the housing 1 facing the slipper 41, there is a groove extending from the end surface of the cylinder block 2 on the side of the head member 5 to the inner circumferential surface of the head member 5 and parallel to the axial direction of the drive shaft 7. Two guide plates 42 are provided, and the restant pin 4
0 and the slipper 41 are adapted to move along a groove formed between the two guide plates 42. Therefore, the swing plate 29 is connected to the guide plate 4.
2 restrains the movement of the drive shaft 7 in the circumferential direction, and swings around the hinge ball 30 in a direction parallel to the axial direction of the drive shaft 7.

Next, the operation of the variable capacity oscillating plate compressor of the present invention having the above structure will be explained.

The rotation of the engine (not shown) is transmitted to the drive shaft 7 through a drive belt (not shown), a pulley, a clutch (not shown), etc.
When the rotation holding member 22 and the swing plate holding member 21 rotate together with the drive shaft 7, the swing plate 2
9 performs a rocking motion in a direction parallel to the axial direction of the drive shaft 7 using the hinge ball 30 as a fulcrum, and the rocking plate 29
The piston 9 reciprocates and slides within the cylinder 8 via a piston rod 39 connected to the piston rod 39, thereby sucking in and compressing the refrigerant gas.

As described above, the maximum discharge capacity of the compressor is determined by the maximum stroke amount of the piston 9, which is determined by the contact between the rocking plate mounting member 21 and the protrusion 28 of the adjustment plate 27.

FIG. 2a shows a case where the maximum discharge capacity of the compressor is large, and FIG. 2b shows a case where the maximum discharge capacity is small, and both differ only in the thickness of the adjustment plate 27. In other words, adjustment plates 27 are prepared with various thicknesses depending on the desired maximum discharge capacity, and for the former with a large maximum discharge capacity, the adjustment plate 27 with a small thickness t ₁ is used with a small maximum discharge capacity. In the latter case, an adjustment plate 27 having a large thickness t ₂ is provided at a predetermined position on the upper side of one side of the rotation holding member 22 . Therefore, the first part of the rocking plate 29 shown in FIG. The maximum inclination position in the clockwise direction in the figure increases in proportion to the difference in the thickness of the adjustment plate 27, and the maximum stroke amount and maximum discharge capacity of the piston 9 also increase accordingly.

Further, the adjustment plate 27 is provided with a protrusion 28, and since the rocking plate mounting member 21 always comes into contact with the protrusion, the contact surface in the direction perpendicular to the axial direction of the drive shaft 7 at the time of this contact. The position is substantially constant regardless of the thickness of the adjustment plate 27. Therefore, the amount of change in the maximum stroke amount is determined by the adjustment plate 2.
The maximum discharge capacity changes in proportion to the maximum stroke amount, and by changing only the thickness of the adjustment plate 27, it is possible to easily and The maximum discharge capacity can be smoothly adjusted to a desired value.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention, in which only the shape of the adjustment plate 27 is different from the first embodiment described above, and the same parts as the first embodiment are The same reference numerals are given. That is, the adjustment plate 27 of this embodiment
does not have the protrusion 28 provided in the first embodiment described above, and instead, the contact surface of the adjustment plate 27 with the swing plate mounting member 21 is inclined at a predetermined angle with respect to the axis of the drive shaft 7. It is constructed with an inclined flat surface. For this reason, the swing plate mounting member 21 and the adjustment plate 27 always come into contact over their entire surfaces when they are in contact with each other.
Therefore, the maximum stroke amount of the piston 9 is
As in the first embodiment described above, since the thickness of the adjustment plate 27 changes in proportion to the amount of change, the thickness determined by the inclination angle of the contact surface with the rocking plate mounting member 21 was adjusted in advance. By installing the adjustment plate 27, the maximum discharge capacity of the compressor can be easily and smoothly adjusted to a desired value as in the first embodiment described above.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention.
The same parts as in the first embodiment described above are given the same reference numerals. The adjusting plate 27 of this embodiment is provided with a protrusion 28 similar to that of the first embodiment. A hole 43 is bored in the upper side of the adjusting plate 27.
3, the tip of an adjustment screw 44 is loosely fitted.
A pair of washers 45 are provided on both sides of the adjustment plate 27 in contact with the side surfaces thereof and fitted onto the adjustment screws 44. As a result, the adjusting plate 27
The displacement in the axial direction of the drive shaft 7 can be adjusted by rotating the adjusting screw 44 in forward and reverse directions. The male threaded portion 44a of the adjustment screw 44 is connected to the rotation holding member 2.
Further, the head 44b of the adjustment screw 44 protrudes outward from the other end surface (the side opposite to the adjustment plate 27) of the rotation holding member 22.

Therefore, in this third embodiment, the desired maximum discharge capacity can be obtained by adjusting the stroke of the adjusting screw 44 and adjusting the displacement of the adjusting plate 27 along the axial direction of the drive shaft 7. Can be done. That is, in this third embodiment, there is no need to prepare a large number of adjusting plates with different thickness dimensions.
Although it is a single adjustment plate, the maximum discharge capacity can be adjusted to any value within the adjustment range using the adjustment screw.

(Effects of the Invention) As detailed above, the present invention includes a rotation holding member that is integrated with a drive shaft and rotates together with the drive shaft;
a swing plate mounting member that rotates together with the drive shaft to swing the swing plate along the axial direction of the drive shaft, and controls the inclination angle of the swing plate integrally with the swing plate mounting member. The variable displacement type is configured such that the discharge capacity is made variable by changing the stroke amount of the piston, and the stroke amount of the piston is maximized when the rocking plate mounting member comes into contact with the rotation holding member. The wobble plate compressor is characterized in that an adjustment member for adjusting the maximum stroke amount of the piston is provided between the contact surfaces of the wobble plate mounting member and the rotation holding member.

Therefore, there is an effect that the maximum discharge capacity can be easily and reliably adjusted with a simple configuration without substantially increasing the manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is a side view of the variable displacement rocking plate compressor of the present invention, Fig. 2 is an enlarged view of the main parts with some of the circular parts in Fig. 1 omitted, and Fig. 3 is a second embodiment of the present invention. FIG. 4 is an enlarged view of main parts showing a third embodiment of the present invention. 7... Drive shaft, 9... Piston, 21... Rocking plate mounting member, 22... Rotation holding member, 27... Adjustment plate (adjustment member), 29... Rocking plate.

Claims (1)

[Scope of utility model registration request] a rotation holding member that is integrated with the drive shaft and rotates together with the drive shaft; and a swing plate mounting member that rotates together with the drive shaft to swing the swing plate along the axial direction of the drive shaft; By controlling the inclination angle of the rocking plate integrally with the rocking plate mounting member and changing the stroke amount of the piston, the discharge capacity is made variable, and by the rocking plate mounting member coming into contact with the rotation holding member. In a variable displacement wobble plate compressor configured to maximize the stroke amount of the piston, the maximum stroke amount of the piston is adjusted between the contact surfaces of the wobble plate mounting member and the rotation holding member. A variable capacity oscillating plate compressor, characterized in that it is provided with an adjusting member.