JP2000257571A - Oldham's coupling and compressor with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an Oldham's coupling and a scroll compressor provided with the coupling capable of improving the efficiency of oil supply to slide sections on a rear surface of a movable scroll member and a thrust load receive face of a housing receiving it by improving the sealing property of a clearance in the axial direction of an Oldham's key and an Oldham's key groove to prevent oil passing in this clearance. SOLUTION: In an Oldham's coupling which is provided with an Oldham's ring 10 arranged between a rear surface of a movable scroll member 70 and a housing 32 and employs key grooves 21, 22 and a key 14 to connect the rear surface of the movable scroll member 70 with the Oldham's ring 10 and connect the housing 32 with the Oldham's ring 10, a sealing member 1 sealing a clearance between the key 14 and the groove 21 corresponding to it is provided in the key 14 to improve the sealing property and flow of oil is introduced into a connection part having no key to improve the lubrication property by oil of the rear surface of the movable scroll member 70 and a face opposing to the housing 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Oldham coupling, and more particularly, to an Oldham coupling used for a rotation preventing mechanism of a scroll member of a scroll compressor and a scroll compressor using the same.

[0002]

2. Description of the Related Art Conventionally, a scroll compressor is used in a refrigerant circuit of an air conditioner for a vehicle (Japanese Patent Laid-Open No. 8-3199).
No. 58, hereinafter referred to as prior art 1 discharge). FIG. 4 is a cross-sectional view of a scroll compressor according to the related art 1. Referring to FIG. 4, the scroll compressor 50 includes a pair of scroll members 60 and 70 between a casing 31 and a housing 32 provided therein, and rotates the main shaft 34 by torque transmitted from an external drive source. Accordingly, one scroll member 70 (hereinafter, referred to as a movable scroll member) is connected to the other scroll member 60 (hereinafter, referred to as a movable scroll member) via a large diameter portion 38, an eccentric pin 39, and an eccentric bush 40 provided at one end of the main shaft 34. , Which is called a fixed scroll member) to compress the fluid by performing a revolving motion that prevents rotation. Here, in order to prevent the movable scroll member 70 from rotating, the housing 3
2 and key grooves 21 and 22 are provided on the back surface of the movable scroll member 70 in a direction orthogonal to the center axis of the main shaft 34 and in directions orthogonal to each other. , And a key that is inserted into the key grooves 21 and 22 and that is movable in the directions of the key grooves 21 and 22, respectively, constitutes an Oldham coupling.

FIG. 5 is a partial sectional view showing the Oldham coupling shown in FIG. 6 is a diagram showing the Oldham ring of FIG. 4, wherein FIG. 6 (a) is a plan view, FIG. 6 (b) is a front view, and FIG. 6 (c) is a side view at the position of FIG. 6 (a). FIG. 6D is a sectional view taken along the line VID-VID in FIG. 6A, FIG. 6E is a sectional view taken along the line VIE-VIE in FIG.
FIG. 7F is a sectional view taken along line VIF-VIF of FIG.

Referring to FIGS. 5 and 6, an Oldham ring 80 includes a circular ring portion 81 and first keys 82 and 83 provided on one surface of the ring portion 81 so as to face each other.
And second keys 84, 8 provided at positions 90 degrees different from the first keys 82, 83 on the outer peripheral portion of the ring portion 81.
5 is provided. As shown in FIGS. 6D, 6E and 6F, the ring portion 81, the first keys 82 and 83, and the second
The keys 84 and 85 are rectangular in cross section. First key 8
2 and 83 are inserted into the groove 22 provided on the back surface of the movable scroll member 70, and the second keys 84 and 85 are inserted into the key groove 21 provided on the surface of the housing 32 facing the movable scroll member 70. ing.

[0005]

However, as shown in FIG. 5, the key 84 of the Oldham ring 80 according to the prior art 1 has a certain gap in the axial direction with respect to the key groove 21 as shown in FIG. The lubrication efficiency is maintained by the forced lubrication by the high and low pressure differential pressure lubrication, and the lubrication efficiency to the sliding portion of the back surface of the orbiting scroll 70 and the thrust load receiving surface of the housing 32 receiving it is reduced due to oil leakage from the gap. I have.

For example, the key 84 of the Oldham ring 80 slides in the direction indicated by the arrow 27,
The thickness of the key 84 is kept smaller than the distance between the thrust load receiving surface 23 receiving the thrust load as indicated by an arrow 78 and the bottom of the key groove, and the gaps 28 and 29 are formed in the axial direction. As shown by an arrow 26 from the high-pressure side 25 to the low-pressure side 24, the oil flows and comes off.

Therefore, a technical problem of the present invention is to improve the sealing performance of the axial gap between the Oldham key and the Oldham keyway, thereby preventing the gap from evacuating the oil, and removing the rear surface of the movable scroll from the rear. An object of the present invention is to provide a thrust coupling capable of improving the lubrication efficiency of a sliding portion of a receiving surface of a receiving thrust load on a receiving surface and a scroll compressor using the same.

[0008]

According to the present invention, there is provided an Oldham ring disposed between a rear surface of a movable scroll member and a housing, and a connection between the rear surface of the movable scroll member and the Oldham ring, and In the Oldham coupling using a key groove and a key for coupling the housing and the Oldham ring, a sealing material for sealing a gap between the key and the corresponding groove is provided on the key to improve sealing performance. In addition, an Oldham coupling is obtained, in which an oil flow is guided to the coupling portion without the key, and the lubricating property by the oil on the opposing surface between the back surface of the movable scroll member and the housing is improved. .

Further, according to the present invention, there is provided a scroll compressor comprising the Oldham coupling.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a scroll fluid using an Oldham coupling according to an embodiment of the present invention.
As shown in FIG. 1, the scroll fluid machine 20 includes a cup-shaped casing 31, a housing 32 provided in the casing, and a front plate 33 that abuts the casing 31 and the housing 32 and covers one open end of the casing 31. And In the space formed by the casing 31 and the housing 32, a fixed scroll member 60 and a movable scroll member 70 are arranged.
The fixed scroll member 60 includes a side plate 61 and a spiral body 62 that draws an involute curve disposed on one end surface of the side plate 61.
And a protrusion 63 provided at the other end. A discharge hole 64 is provided in the center of the spiral body 62 through the side plate 61, and includes a discharge valve 65 and a retainer 66 for adjusting the opening of the discharge valve 65 so as to cover the discharge hole 64. ,
These are fixed to the other end surface of the side plate 61 via bolts 67. A discharge chamber 69 is defined by the inside of the bottom of the casing 31 and the other end surface of the side plate 61. In addition, the fixed scroll member 60 is
It is fixed to the housing 32.

The movable scroll member 70 includes a side plate 71,
A spiral body 72 provided on one surface of the side plate 71 and having the same shape as the involute curve meshing with the spiral body 6 of the fixed scroll member 60, and a boss portion 73 provided on the other surface of the side plate 71 so as to protrude in a cylindrical shape. ing. A key groove 22 of an Oldham coupling, which will be described later, is provided on the back surface (back surface) of the movable scroll member 70.

The cylindrical projection 3 of the front plate 33
A main shaft 34 is provided to penetrate 3a from the outside to the inside. Inside the main shaft 34 (in the figure, closer to the scroll member)
Is provided with a flange portion 35, and the housing 32,
It is rotatably supported between the front plate 33 and a bearing 45 via a bearing 45. Further, a large diameter portion 38 is provided inside the flange portion 35 (in the drawing, on the scroll member side), and is supported in the housing 32 via a bearing 44. An eccentric pin 39 is provided to protrude from an inner eccentric position further from the end of the large diameter portion 38, and is provided at an eccentric position of the eccentric bush 40 supported and accommodated in the boss 73 of the movable scroll member 70 via the bearing 42. Through hole 4 provided
1 is inserted. A counterbalance weight 43 is provided around the large-diameter portion 38 of the eccentric bush 40.

The housing 32 is provided with a lubricating oil circulation control mechanism 45 for guiding lubricating oil to a drive mechanism.

An electromagnetic clutch 51 for controlling transmission of torque from an external drive source to the main shaft is provided around the protrusion 33a of the front plate 33. Electromagnetic clutch 5
Reference numeral 1 denotes a hollow and double cylindrical rotor 52, an electromagnet device 53 disposed in the rotor 52, an armature 54 facing one end surface of the rotor 52, and an armature 54.
And a fixing portion 55 connected to one end of the main shaft 34 via a leaf spring 54a. The electromagnetic clutch 51 causes one end of the rotor 52 rotated by an external drive source to attract the armature 54 by the operation of the electromagnet device 53, and transmits the rotation of the rotor 52 to the main shaft 34.

The housing 32 is provided with a key groove 21 constituting an Oldham coupling. Between the housing 32 and the side plate 71 of the movable scroll member 70 and around the boss 73 of the movable scroll member 70, keys inserted into the key groove 21 of the housing 32 and the key groove 22 of the movable scroll member 70, respectively. To 14,15
And an Oldham ring 10 having 12,13.

The keyway 21 of the housing 32, the keyway 22 of the movable scroll member 22, and the Oldham ring 10
Thus, an Oldham coupling that prevents the movable scroll member 22 from rotating when driven is configured.

The scroll fluid machine 20 having such a configuration is described.
When the electromagnetic clutch 51 operates, the torque is transmitted to the main shaft 34 from the external power source. The rotation of the main shaft 34 is converted from the large diameter portion 38 into a turning motion of the eccentric pin 39 and the eccentric bush 32, and is converted into a turning motion of the movable scroll member 70 with respect to the fixed scroll member 60, which is prevented from rotating by the Oldham coupling. You.

When the scroll members 60 and 70 are driven, the fluid sucked from the suction port 58 is turned from the surroundings toward the center as a fluid pocket 77 formed between the two spiral bodies 62 and 72. While moving along the wall of 72, it is gradually compressed and discharged from the discharge hole 64 to the discharge chamber 69, passes through the discharge passage 75, and is discharged from the discharge port 57.
From the fluid machine 20 to a circuit outside the fluid machine 20.

FIG. 2 is a partial cross-sectional view of the vicinity of the Oldham ring of the Oldham coupling used in the scroll fluid machine of FIG. 1, FIG. 3A is a plan view of the Oldham ring, and FIG.
FIG. 3C is a front view, and FIG. 3C is a side view produced so as to correspond to the plan view of the Oldham ring of FIG. FIG. 3 (d)
3A is a sectional view taken along the line IIID-IIID of the Oldham ring of FIG. 3A, and FIG. 3E is a sectional view taken along the line IIIE-IIIE of FIG. 3A.

The Oldham ring 10 shown in FIGS. 2 and 3
Are a ring portion 11, first keys 12 and 13 provided on one surface side of the ring portion 11, and first keys 12, 13 and 9
It has second keys 14 and 15 which are shifted from the 0 ° angle and protrude from the outer periphery of the ring portion 11.

The first keys 12 and 13 are engaged with the key groove 22 provided on the movable scroll member 70, and the second keys 14 and 15 are engaged with the key groove 2 provided on the housing 32.
1 is engaged.

As shown in FIG. 3, the first and second keys 1
Grooves 12a, 1 are provided on the upper and lower surfaces of 2, 13, 14, 15 respectively.
3a, 14a and 15a are provided respectively. Further, sealing materials 1 and 2 are provided in the grooves 12a, 13a, 14a and 15a so as to protrude from the opening surfaces of these grooves. The sealing material is made of an elastic material such as rubber, and is fixed to the groove with an adhesive. However, the material and the fixing method are not limited as long as the sealing material is used.

Referring to FIG. 2, a key groove 21 is formed between the sliding surface of the housing 32 and the movable scroll member 70, that is, the thrust load receiving surface 23, and the key 14 is formed therein. Although inserted, the gap between the groove and the key is sealed by the sealing material 1 so that oil does not flow from the high-pressure side 25 to the low-pressure side 24.

Therefore, according to the Oldham ring 10 according to the embodiment of the present invention, the efficiency of oil supply to the thrust load receiving surface 23 is improved by improving the sealing property of the axial gap between the Oldham key and the Oldham keyway. ,
The sliding surface, abnormal wear and welding due to oil film shortage can be prevented, and lubricity to the drive mechanism can be improved.

[0026]

As described above, according to the present invention, the gap between the key of the Oldham ring and the keyway of the Oldham ring in the axial direction is closed by the sealing material, so that the gap is released from the high pressure side to the low pressure side through this gap. By stopping the oil flow, the lubrication efficiency to the sliding point on the back of the movable scroll and the thrust load receiving surface of the housing that receives it is improved,
It is possible to provide an Oldham coupling capable of preventing abrasion and welding of a sliding surface due to oil film shortage, and a scroll compressor using the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a scroll fluid using an Oldham coupling according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of the vicinity of an Oldham ring of the Oldham coupling used in the scroll fluid machine of FIG. 1;

FIG. 3A is a plan view of an Oldham ring.
(B) is a front view of an Oldham ring. (C) is a side view produced so as to correspond to the plan view of the Oldham ring of (a). (D) of the Oldham ring of (a)
It is a IIID-IIID line sectional view. (E) is III of (a)
FIG. 3 is a sectional view taken along line E-IIIE.

FIG. 4 is a cross-sectional view of a scroll compressor according to the related art 1.

FIG. 5 is a partial sectional view showing the Oldham coupling of FIG. 4;

FIG. 6 is a view showing the Oldham ring of FIG. 4;
Is a plan view, (b) is a front view, (c) is a side view at the position of (a), (d) is a sectional view taken along the line VID-VID of (a),
(E) is a sectional view taken along the line VIE-VIE of (a), (f) is (a)
FIG. 6 is a sectional view taken along line VIF-VIF of FIG.

[Explanation of symbols]

 1, 2 Sealing material 10 Oldham ring 11 Ring portion 12, 13 First key 12a, 13a groove 14, 15 Second key 14a, 15a groove 20 Scroll fluid machine 21, 22 Key groove 23 Thrust load receiving surface 24 Low pressure side 25 High-pressure side 28, 29 Clearance 31 Casing 32 Housing 33 Front plate 33a Projecting portion 34 Main shaft 35 Flange 38 Large diameter portion 40 Eccentric bush 41 Through hole 42, 44 Bearing 43 Counterbalance weight 45 Lubricating oil circulation control mechanism 50 Scroll type compression Machine 51 Electromagnetic clutch 52 Rotor 53 Electromagnet device 54 Armature 55 Fixed member 57 Discharge port 58 Suction port 60 Fixed scroll member 61, 71 Side plate 62, 72 Spiral body 63 Projecting portion 64 Discharge hole 65 Discharge valve 66 Retainer 67 Vol 69 the discharge chamber 70 the movable scroll member 73 boss 76 the discharge passage 80 Oldham ring 81 ring 82, 83 the first key 84 and 85 the second key

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA17 AB03 BB01 BB16 BB44 BB50 CC05 CC08 CC19 CC22 CC33 CC38 3H039 AA02 AA12 BB04 BB11 BB12 BB15 BB25 CC02 CC08 CC16 CC22 CC27 CC31 CC33 CC35 CC42

Claims (2)

[Claims] An Oldham ring is provided between a rear surface of a movable scroll member and a housing, and a key is provided for coupling the rear surface of the movable scroll member to the Oldham ring and coupling the housing to the Oldham ring. In the Oldham coupling using a groove and a key, a seal material for sealing a gap between the key and the corresponding groove is provided on the key to improve sealing performance, and to a coupling part without the key. An Oldham coupling, which guides the flow of oil to improve the lubricity of the surface of the movable scroll member facing the rear surface of the movable scroll member with the oil. 2. A scroll compressor comprising the Oldham coupling according to claim 1.