JPH0552273U - Oscillating plate support structure of an oscillating plate compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an oscillating plate support structure of an oscillating plate type compressor, which can securely hold a bearing and an oscillating plate on a drive hub and can make a mass of a balance weight sufficiently large. .. A rocking plate support structure for a rocking plate type compressor in which a rocking plate 24 is rotatably supported on an outer periphery of a boss portion 20c of a drive hub 20 via a bearing 23. A male screw 20e is formed on the outer periphery of the boss portion 20c on the side closer to the tip than the bearing 23, and has a female screw 40a that engages with this male screw 20e.
First balance weight 40 that is screwed into e and presses one end surface of bearing 23, and female screw 5 that is screwed into male screw 20e
0a, and the second balance weight 50 that is screwed into the male screw 20e and presses the first balance weight 40. Female screws of both balance weights 40, 50
Both balance weights are formed so as to be fastened to the male screw 20e by the rotation of the drive hub 20.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an oscillating plate support structure for an oscillating plate compressor, and particularly to an outer periphery of a boss of a drive hub which is rotatably supported by the drive shaft and which is rotated by the rotation of the drive shaft. The present invention relates to an oscillating plate support structure that is rotatably supported via bearings.

[0002]

[Prior Art]

 As an oscillating plate support structure of a conventional oscillating plate type compressor, as shown in FIGS. 3 and 4, a drive hub 101 rotatably and oscillatably supported by a drive shaft 100 is used to rotate a drive shaft 100. It is connected to the drive shaft 100 via a rotation holding member 102 so as to rotate together, and a recess 103a is provided in the inner peripheral edge of the swing plate 103 whose rotation is restricted. A bearing 104 is press-fit into this recess 103a. In the swing plate supporting structure of the swing plate type compressor in which the swing plate 103 is rotatably supported on the outer periphery of the boss portion 101a of the drive hub 101 via 104, the tip end portion of the boss portion 101a of the drive hub 101. A recess 101b and a male screw 101c are provided on the outer circumference, and a balance piece having projections 105a and 106a engaging with the recess 101b is provided on the outer circumference of the boss 101a. Eito 105 and lock washer 106 is fitted, it is what is fastened lock nut 107 further external thread 101c, proposed by the present applicant (Japanese Patent Application No. 3-103850). In this structure, the balance weight 105 is fitted on the outer periphery of the boss portion 101a of the drive hub 101 so that the convex piece 105a is engaged with the concave portion 101b of the boss portion 101a, and the lock washer 106 is formed on the outer periphery of the boss portion 101a. After fitting, the convex piece 106a is engaged with the concave portion 101b, the lock nut 107 is further tightened to the male screw 101c of the boss 101a, and one of the convex portions 106b of the lock washer 106 is bent. The bent convex portion 106b is engaged with the concave portion 107a of the lock nut 107, thereby preventing the lock nut 107 from rotating.

[0003]

However, in the above-described conventional technique, (1) the convex portion 106b of the lock washer 106 that is bent to prevent the lock nut 107 from rotating is shaken by vibration during operation of the compressor. If the lock nut 107 is disengaged from the recess 107a, the lock nut 107 may be loosened, and as a result, the bearing 104 and the rocking plate 103 may not be reliably supported by the drive hub 101. (2) Assembling At this time, first, the balance weight 105 is fitted to the boss portion 101a of the drive hub 101, the convex piece 105a is engaged with the concave portion 101b of the boss portion 101a, and then the lock washer 106 is fitted to the boss portion 101a. The convex piece 106a is engaged with the concave portion 101b, and then the lock nut 107 is tightened to the male screw 101c of the boss portion 101a. Finally, one of the protrusions 106b of the lock washer 106 must be bent, and this bent protrusion 106b must be engaged with the recess 107a of the lock nut 107, which complicates the assembly work. The lock washer 106 and the lock nut 107 are arranged in the concave portion of the balance weight 105, and as described above, the lock nut 107 is tightened, and finally one of the convex portions 106b of the lock washer 106 is bent. Since it is necessary to engage the bent convex portion 106b with the concave portion 107a of the lock nut 107, an empty space is required around the lock nut 107 for performing the above work, and only this space is required. The weight of the balance weight 105 cannot be made sufficiently large. Furthermore, (4) the balance weight 105, Three members, a lock washer 106 and a lock nut 107, are required, and a recess 101b is provided on the outer periphery of the boss portion 101a of the drive hub 101, and the protrusions 105a and 106a are provided on the balance weight 105 and the lock washer 106, respectively. Therefore, there is a problem that the number of parts is large and the processing is complicated and the manufacturing cost is increased.

The present invention has been made in view of such conventional problems, and it is possible to securely hold the bearing and the oscillating plate on the drive hub and to make the mass of the balance weight sufficiently large. It is an object of the present invention to provide an oscillating plate support structure for an oscillating plate compressor, which can be easily assembled and processed to reduce the manufacturing cost.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention makes a drive hub, which is rotatably and swingably supported by a drive shaft, rotate with the rotation of the drive shaft. In a rocking plate support structure of a rocking plate type compressor, in which a bearing is press-fitted into a recess, and the rocking plate is rotatably supported on the outer periphery of the boss portion of the drive hub via the bearing, A male screw is formed on the outer periphery of the boss portion closer to the tip end side than the bearing, and has a female screw that is screwed to this male screw on the inner periphery, and is screwed into the male screw to press the bearing into the recess. Balance weight, and a second balance weight having an internal thread that is screwed to the male thread on the inner periphery and tightened on the male thread to press the first balance weight toward the bearing side. Balance weight An internal thread, in which the two balanced web site by the rotation of the drive hub is formed in a direction tightened to the external thread.

[0006]

[Action]

 A male screw is formed on the outer periphery of the boss of the drive hub on the side closer to the tip than the bearing, and a female screw that engages with this male screw is provided on the inner periphery.Tighten the male screw to mount the bearing in the recess of the vibration plate. A first balance weight that presses to the male screw, and a second balance weight that has a female screw that is screwed into the male screw on the inner circumference and that is screwed into the male screw to push the first balance weight toward the bearing side. Since the female screws of both balance weights are formed in the direction in which both balance weights are tightened into the male screws by the rotation of the drive hub, both balance weights serve as double nuts and the bearing and oscillating plate are connected to the drive hub. Both balance weights are fastened to their bosses by the rotation of the drive hub during the operation of the compressor, and both balance weights are supported. Loosening of is prevented.

[0007]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a vertical sectional view of an oscillating plate type variable displacement compressor having an oscillating plate supporting structure according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a housing of the compressor. The housing 1 is a cylinder block 2, a rear head 4 airtightly attached to one end surface (the left end surface in the drawing) of the cylinder block 2 via a valve plate 3, and the other end surface (the right end surface in the drawing) of the cylinder block 2. It consists of a front head 5 airtightly attached to. Inside the housing 1, a crank chamber 6 is defined by an end surface of the cylinder block 2 on the front head 5 side and an inner peripheral surface and an inner end surface of the front head 5. The cylinder block 2 has a plurality of driving shafts 7 arranged substantially along the center line of the housing 1 at the center and parallel to that of the driving shafts 7 at predetermined intervals in the circumferential direction. Cylinders 8 are provided, and pistons 9 are slidably fitted in the respective cylinders 8.

A discharge port (not shown) for discharging the compressed refrigerant gas is formed in one end wall (the left end wall in the drawing) of the rear head 4. A discharge chamber 10 is formed in a substantially central portion inside the rear head 4, and the discharge chamber 10 communicates with a discharge port. The valve plate 3 is provided with a discharge port 3a which communicates with the cylinder 8 and the discharge chamber 10. The discharge port 3a is opened and closed by a discharge valve 12, and the discharge valve 12 is attached to the rear head 4 side of the valve plate 3 with a set screw 14 together with the discharge valve stopper 13. A suction chamber 15 is formed on the outer peripheral side of the discharge chamber 10, and the suction chamber 15 is connected to the cylinder 8 via a suction port 3c formed in the valve plate 3. The suction port 3c is opened and closed by a suction valve 15a, and the suction valve 15a is attached to the cylinder plate 2 side of the valve plate 3.

The suction chamber 15 is connected to an outlet of an evaporator of an air conditioner (not shown) via a suction port (not shown), and the discharge chamber 10 is connected to an inlet of a condenser (not shown) via a discharge port. .

The suction chamber 15 communicates with the crank chamber 6 via a communication passage 16. The communication passage 16 includes a first passage portion 17 provided in the cylinder block 2, a passage portion 3e provided in the valve plate 3, and a second passage portion 18 provided in the rear block 4. The first passage portion 17 includes a hole portion 17 a provided on the crank chamber 6 side of the cylinder block 2 and a hole portion 17 b provided on the valve plate 3 side. The second passage portion 18 includes a hole portion 18a communicating with the passage portion 3e and a hole portion 18b communicating with the hole portion 18a.

A pressure adjusting valve 19 is provided in the communication passage 16. The pressure control valve 19 controls the pressure in the crank chamber 6 by opening and closing the communication passage 16. The pressure regulating valve 19 is composed of a solenoid valve, and when not energized, the valve body 19a contacts the valve seat 19b to keep the valve closed, and when energized, the valve body 19a separates from the valve seat 19b and opens. In other words, the crank chamber 6 and the suction chamber 15 communicate with each other via the communication passage 16.

An end of the drive shaft 7 on the rear head 4 side is rotatably supported in a center hole of the cylinder block 2 via a bearing 34, and an end of the drive shaft 7 on the front head 5 side is in a center hole of the front head 5. It is rotatably supported via a bearing 36.

A rotation holding member 21 for transmitting the rotation of the drive shaft 7 to the drive hub 20 is fitted on the outer peripheral surface of the drive shaft 7 on the front head 5 side, and the rotation holding member 21 has a thrust bearing 22 interposed therebetween. It is supported by 5.

The drive hub 20 is slidably in contact with the outer periphery of a hinge ball 11 which is loosely fitted to the drive shaft 7 and axially slidably fitted to the outer periphery of a substantially middle portion of the drive shaft 7 in the axial direction. The hinge ball 11 rotatably and swingably supports the drive shaft 7. A convex piece 20a is provided on one surface of the drive hub 20, and a connecting pin 20b is fixed to the convex piece 20a. Since the connecting pin 20b is engaged with the guide hole 21a provided in the rotation holding member 21, the drive hub 20 rotates together with the rotation holding member 21 as the drive shaft 7 rotates, and the drive hub 20 is driven. It is swingable in the axial direction with respect to the shaft 7 and the rotation holding member 21.

As shown in FIGS. 1 and 2, the boss portion 20c of the drive hub 20 is provided with a recess 20d and a male screw 20e on the outer periphery of the front end. An oscillating plate 20 is rotatably supported on the outer periphery of the boss portion 20c of the drive hub 20 via an angular ball bearing (may be a tapered roller bearing) 23. The angular type ball bearing 23 is press-fitted into a recess 24 a provided on the inner peripheral edge of the rocking plate 24. A thrust bearing 25 is provided between the end surface of the oscillating plate 24 and the end surface of the drive hub 20.

A first balance weight 40 and a second balance weight 50 are attached to the male screw 20e of the boss portion 20c of the drive hub 20.

The first balance weight 40 is an annular body and has an internal thread 40a that is screwed into the external thread 20e. Further, on the end face of the first balance weight 40 on the bearing 23 side, there is provided an abutting portion 40b (see FIG. 1) that presses one end face of the inner ring 23a of the bearing 23 when tightened with the male screw 20e. An annular recess 40c for accommodating the second balance weight 50 is formed on the end surface on the side opposite to the bearing. A plurality of notches 40d are formed on the outer peripheral portion of the end surface of the first balance weight 40 on the side opposite to the bearing, to which the claws of a tightening tool (not shown) engage.

The second balance weight 50 is an annular body and has an internal thread 50a that is screwed into the external thread 20e. The second balance weight 50 is fitted into the annular recess 40c of the first balance weight 40 up to about half its thickness (see FIG. 1), and one end face 50b of the second balance weight 50 is bottom face 40e of the annular recess 40c. Can be contacted with. A plurality of notches 50c are formed on the outer peripheral portion of the end surface of the second balance weight 50 on the side opposite to the bearing, to which the claws of a tightening tool (not shown) engage.

The female screws 40a and 50a of the first balance weight 40 and the second balance weight 50 are fastened to the male screws 20e of the boss portion 20c by the rotation of the drive hub 20. It is formed in the direction to be inserted. That is, since the drive hub 20 rotates to the right as the drive shaft 7 rotates in the direction of arrow A in FIG. 1, the female screws 40a and 50a of both balance weights 40 and 50 are right-handed screws.

Further, in this embodiment, the inertial masses of the first balance weight 40 and the second balance weight 50 are made substantially equal to each other.

As shown in FIG. 1, a spring 29 is provided on the outer periphery of the drive shaft 7 between the hinge ball 11 and the rotation holding member 21, and the hinge ball 11 causes the hinge ball 11 to move to the cylinder block 2. It is biased to the side (left side in the figure). A stopper 30 is provided so as to project from the hinge ball 11 to the drive shaft 7 on the cylinder block 2 side, and a plurality of disc springs 31 and coils are provided on the outer periphery of the drive shaft 7 between the stopper 30 and the hinge ball 11. Il springs 32 are sequentially interposed, and the hinge balls 11 are urged toward the front head 5 side (right side in the figure) by these springs 31 and 32.

The tip 24b of the swing plate 24 facing the piston 9 and the piston 9 are rotatably connected to each other by a piston rod 35 having balls 33a and 33b at both ends. The piston 9 axially reciprocally slides in the cylinder 8 by the piston rod 35 in accordance with the swing motion of the swing plate 24, and sucks and compresses the refrigerant gas.

A restraint pin 37 is provided on the oscillating plate 24, and a cylindrical slipper 38 is provided at an end of the restraint pin 37. The slipper 38 is engaged with a groove 60 extending in the axial direction of the drive shaft 7, and the rotation of the rocking plate 24 is restricted by this engagement.

Next, the operation of the oscillating plate type variable displacement compressor according to the embodiment having the above configuration will be described.

When the rotational power of the engine (not shown) is transmitted to the drive shaft 7 via the drive belt, pulley, and clutch (not shown) and the drive shaft 7 rotates, this rotation is transmitted to the drive hub 20 via the rotation holding member 21. When transmitted, the drive hub 20 rotates together with the rotation holding member 21. By this rotation, the swing plate 24, which is restricted in rotation, swings about the hinge ball 11 as a fulcrum.

When the pressure adjusting valve 19 is closed, the pressure in the crank chamber 6 rises, the tilt angle of the oscillating plate 24 decreases, the capacity decreases, and when the pressure adjusting valve 19 is opened, The pressure in the crank chamber 6 decreases, the inclination angle of the oscillating plate 24 increases, and the capacity increases.

The procedure for mounting the first balance weight 40 and the second balance weight 50 on the boss portion 20c of the drive hub 20 is as follows.

First, the female screw 40a of the first balance weight 40 is screwed into the male screw 20e of the boss portion 20c, and the claw of a tightening tool (not shown) is engaged with the notch portion 40d to move the first balance weight 40. The second balance weight 50 is tightened to the boss portion 20c, and then the female screw 50a of the second balance weight 50 is screwed to the male screw 20e of the boss portion 20c. Tighten the balance weight 50 to the boss 20c (see FIG. 1).

In this way, when the first balance weight 40 and the second balance weight 50 are mounted on the boss portion 20c, the abutting portion 40b of the first balance weight 40 is attached to the angular type ball bearing 23. The one end surface of the inner ring 23a is pushed into the recess 24a of the oscillating plate 24, and the one end surface 50b of the second balance weight 50 abuts the bottom surface 40e of the annular recess 40c of the first balance weight 40. 40 is pushed to the bearing 23 side. Moreover, the female screws 40a and 50a of the balance weights 40 and 50 are formed in the direction in which the balance weights 40 and 50 are tightened by the male screw 20e of the boss portion 20c by the rotation of the drive hub 20. The balance weights 40 and 50 serve as double nuts to tighten and support the bearing 23 and the oscillating plate 24 on the drive hub 20, and both the balance weights 40 and 50 are rotated by the rotation of the drive hub 20 during operation of the compressor. The balance weights are tightened to prevent the balance weights from loosening. As a result, the angular type ball bearing 23 and the rocking plate 24 can be reliably supported by the drive hub 20.

Further, when the first balance weight 40 and the second balance weight 50 are attached to the boss portion 20 c, the abutting portion 40 b of the first balance weight 40 is attached to the angular type ball bearing 23. Since one end surface of the inner ring 23a is pushed into the recess 24a of the rocking plate 24, the ball 23c of the bearing 23 moves in the axial direction, and the inner peripheral surface of the inner ring 23a is inclined, so that the ball 23c moves in the radial direction. When the inner peripheral surface of the outer ring 23b is pushed by this movement, the inner peripheral surface of the outer ring 23b is also inclined, so that the outer ring 23b is pushed in the radial direction and the axial direction. As a result, the axial clearance and radial clearance between the end surface of the angular type ball bearing 23 and the oscillating plate 24 are eliminated, and vibration due to play is prevented from occurring and noise can be suppressed.

According to the above-mentioned embodiment, since the inertial masses of the first balance weight 40 and the second balance weight 50 are made substantially equal to each other, both balance weights are started at the time of starting the compressor. Inertia moments acting on 40 and 50 are almost equal, and both balance weights 40 and 50 do not loosen at the time of starting.

Further, according to the above-described embodiment, the second balance weight 50 is fitted into the annular recess 40c of the first balance weight 40 up to about half its thickness (see FIG. 1). It is possible to shorten the axial length occupied by both balance weights 40 and 50.

[0034]

[Effect of the device]

 As described above in detail, according to the swing plate support structure of the swing plate compressor of the present invention, the drive hub rotatably and swingably supported by the drive shaft is rotated by the rotation of the drive shaft. In order to rotate, a recess is formed in the inner peripheral edge of the swing plate, and a bearing is press-fitted into this recess, and the swing plate is rotatably supported on the outer periphery of the boss portion of the drive hub via this bearing. In the oscillating plate support structure of the oscillating plate compressor, a male screw is formed on the outer periphery of the boss portion of the drive hub on the side closer to the front end than the bearing, and has an internal screw thread to be screwed to the male screw on the inner periphery, It has a first balance weight that is screwed into the male screw and presses the bearing into the recess, and a female screw that is screwed into the male screw on the inner circumference, and is screwed into the male screw to the first balance weight. The second balancer that pushes to the bearing side And a site, said both balance weight internal thread, with the configuration wherein both balance weight by rotation of the Dora Ibuhabu is is formed in the direction tightened to the male screw, the following effects can be obtained.

(1) Both balance weights function as double nuts to support the bearing and the oscillating plate by tightening them on the drive hub, and both balance weights are rotated by the drive hub during the operation of the compressor so that the boss portion thereof is rotated. The balance weights are prevented from loosening. Therefore, the bearing and the oscillating plate can be securely held on the drive hub.

(2) After the first balance weight is screwed into the male screw of the boss portion of the drive hub, the second balance weight may be screwed into the male screw, so that there is a space around the second balance weight 6. There is no need to provide space, and the masses of both balance weights can be made sufficiently large correspondingly, which increases the degree of freedom in design.

(3) When attaching both balance weights to the boss portion of the drive hub, after tightening the first balance weight into the male screw of the boss portion of the drive hub, attach the second balance weight to the male screw. Since it only has to be tightened, the work of assembling the oscillating plate, bearing, and balance weight on the drive hub can be simplified, and the manufacturing cost can be reduced.

(4) Further, the bearing and the oscillating plate may be used as members for supporting and fixing them to the drive hub, and two balance weights may be manufactured. Moreover, each balance weight has a female screw on the inner peripheral surface. Since the shape is simple, the number of parts is small, the manufacturing is easy, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an oscillating plate compressor having an oscillating plate support structure according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of an embodiment of the present invention.

FIG. 3 is a sectional view showing an oscillating plate support structure of a conventional oscillating plate compressor.

FIG. 4 is an exploded perspective view showing a part of the rocking plate support structure shown in FIG.

[Explanation of symbols]

 7 Drive Shaft 20 Drive Hub 20c Boss 20e Male Thread 23 Angular Ball Bearing (Bearing) 24 Swing Plate 24a Recess 40 First Balance Weight 40a Female Thread 50 Second Balance Weight 50a Female Thread

Claims (1)

[Scope of utility model registration request] 1. A drive hub, which is rotatably and swingably supported by a drive shaft, is made to rotate with the rotation of the drive shaft, a recess is provided in an inner peripheral edge of the swing plate, and a bearing is press-fitted into the recess. In an oscillating plate support structure of an oscillating plate type compressor in which the oscillating plate is rotatably supported on the outer periphery of a boss portion of the drive hub via the bearing, A male screw is formed on the outer periphery on the tip side, and a female screw that is screwed to this male screw is provided on the inner periphery. A second balance weight that has an internal thread that is screwed into the inner periphery and that is tightened into the external thread to press the first balance weight toward the bearing side. Hub The balance plate support structure of a swing plate type compressor, wherein both balance weights are formed in a direction in which the balance weights are tightened by the rotation of the.