EP3786452A1

EP3786452A1 - Oldham ring and scroll compressor

Info

Publication number: EP3786452A1
Application number: EP19792850.0A
Authority: EP
Inventors: Yoshiki Kobayashi; Yogo Takasu; Hajime Sato; Masahiro Taniguchi; Kazuki Takahashi
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2018-04-25
Filing date: 2019-03-27
Publication date: 2021-03-03
Also published as: CN112292531B; EP3786452A4; AU2019258375B2; WO2019208075A1; JP2019190383A; CN112292531A; JP7016285B2; AU2019258375A1

Abstract

A first distance (D1) between a pair of linear portions (64, 65) in which first Oldham keys (57, 58) are respectively arranged is configured so as to become shorter than a second distance (D2) between a first connecting portion (67) in which a second Oldham key (61) is arranged and a second connecting portion (68) in which a second Oldham key (62) is arranged, and areas of first pressure-receiving surfaces (57a, 58a) of the first Oldham keys (57, 58) are made larger than areas of second pressure-receiving surfaces (61a, 62a) of the second Oldham keys (61,62).

Description

[Technical Field]

The present invention relates to an Oldham ring and a scroll compressor. The present application claims priority based on Japanese Patent Application No. 2018-084536 filed in Japan on April 25, 2018, the contents of which are incorporated herein by reference.

[Background Art]

Scroll compressors that compress fluids (refrigerants) are used in air conditioners, refrigerators, and the like. The scroll compressor rotates the orbiting scroll so as to revolve with respect to the fixed scroll and compresses the fluid by reducing the capacity of the compression chamber formed between the fixed scroll and the orbiting scroll.
The scroll compressor has an Oldham ring for suppressing the rotation of the orbiting scroll. The Oldham ring has an Oldham key.
Patent Document 1 discloses an Oldham ring having an oval shape from the viewpoint of reducing the size of the Oldham ring and the orbiting scroll. The Oldham ring disclosed in Patent Document 1 has a pair of straight linear portions, a first arc portion connecting one end of the pair of straight linear portions, and a second arc portion connecting the other ends of the pair of straight linear portions. It has a part, a first Oldham key provided in each of the pair of straight linear portions and inserted into the groove of the end plate of the orbiting scroll, and a second Oldham key provided in each of the first and second arc portions.
The first Oldham key is arranged on one side of the Oldham ring in the axial direction. The first Oldham key is arranged in the circumferential direction of the Oldham ring and has a first pressure-receiving surface that receives a load from the orbiting scroll. The second Oldham key is located on the other side of the Oldham ring in the axial direction. The second Oldham key has a second pressure-receiving surface arranged in the circumferential direction of the Oldham ring. From the viewpoint of reducing the size of the Oldham ring and the orbiting scroll, the distance between the pair of straight linear portions is configured to be smaller than the distance between the first arc and the second arc.

[Citation List]

[Patent Literature]

[PTL 1] Japanese Unexamined Patent Application, Publication No. H10-54378

[Summary of Invention]

[Technical Problem]

As described above, the Oldham ring disclosed in Patent Document 1 is configured such that the distance between the pair of straight linear portions is smaller than the distance between the first arc and the second arc. The distance between the pair of first Oldham keys is smaller than the distance between the pair of second Oldham rings.
As a result, a load (orbiting load, compression load, etc.) larger than the load received by the second pressure-receiving surface of the second Oldham key acts on the first pressure-receiving surface of the first Oldham key, and the first Oldham key is released. It could be damaged.
Therefore, an object of the present invention is to provide an Oldham ring and a scroll compressor capable of reducing the size and weight of the Oldham ring and the orbiting scroll while suppressing damage to the first Oldham key.

[Solution to Problem]

In order to solve the above problems, the Oldham ring of the present invention employs the following solutions. An Oldham ring according to an aspect of the present invention includes: an Oldham ring main body provided with a pair of straight linear portions extending in the first direction and facing each other in a second direction orthogonal to the first direction, a first connecting portion connecting one end of the pair of straight linear portions and a second connecting portion connecting the other end of the pair of straight linear portions and facing the first connecting portion in the first direction; a first Oldham key provided on each of the surfaces of the pair of straight linear portions arranged on one side of an axis of the Oldham ring main body orthogonal to the first direction and the second direction and having a first pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, and receiving a load; and a second Oldham key provided on each of the surfaces of the first connecting portion and the second connecting portion arranged on the other side of the axis and having a second pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, and receiving a load, wherein a first distance between the pair of straight linear portions in the second direction is shorter than a second distance between the first connecting portion and the second connecting portion in the first direction, and the area of the first pressure-receiving surface is larger than the area of the second pressure-receiving surface.
According to the present invention, the first distance between the pair of straight linear portions in the second direction is made shorter than the second distance between the first connecting portion and the second connecting portion in the first direction. This makes it possible to reduce the size of the Oldham ring and the orbiting scroll in the second direction.
As a result, it is possible to reduce the size and weight of the Oldham ring and the orbiting scroll.
Further, by making the area of the first pressure-receiving surface of the first Oldham key, which is shorter than the axis of the Oldham ring main body, larger than the area of the second pressure-receiving surface of the second Oldham key, It is possible to reduce the surface pressure of the first pressure-receiving surface that receives a load larger than the load received by the second pressure-receiving surface, and prevent the first Oldham key from being damaged.
That is, according to the present invention, it is possible to reduce the size and weight of the Oldham ring and the orbiting scroll while suppressing damage to the first Oldham key.
Further, in the Oldham ring according to one aspect of the present invention, the height of the first Oldham key may be higher than the height of the second Oldham key in the axial direction in which the axis extends.
In this way, by making the height of the first Oldham key higher than the height of the second Oldham key in the axial direction, the area of the first pressure-receiving surface in the second direction can be larger than the area of the second pressure-receiving surface without increasing the size of the Oldham ring.
Further, in the Oldham ring according to one aspect of the present invention, the length of the first Oldham key in the second direction may be longer than the length of the second Oldham key in the first direction.
In this way, by making the length of the first Oldham key in the second direction longer than the length of the second Oldham key in the first direction, the area of the first pressure-receiving surface can be made larger than the area of the second pressure-receiving surface.
Further, in the Oldham ring according to one aspect of the present invention, the width of the first Oldham key in the first direction may be wider than the width of the second Oldham key in the second direction.
In this way, by making the width of the first Oldham key in the first direction wider than the width of the second Oldham key in the second direction, the connection strength between the Oldham key main body and the first Oldham key can be increased.
As a result, damage to the first Oldham key can be prevented.
Further, in the Oldham ring according to the one aspect of the present invention, the first Oldham key may be arranged so as not to protrude outward from the outer surface of the straight linear portion.
In this way, by arranging the first Oldham key so as not to protrude outward from the outer surface of the straight linear portion, it is possible to suppress the enlargement of the Oldham ring in the second direction.
Further, in the Oldham ring according to one aspect of the present invention, the first connecting portion and the second connecting portion each have a circular arc shape.
In this way, by forming the shapes of the first connecting portion and the second connecting portion into an arc shape, respectively, the stress received by the first connecting portion and the second connecting portion can be reduced as compared with the case where the first connecting portion and the second connecting portion are formed in a linear shape.
Further, in the Oldham ring according to one aspect of the present invention, an area of the cut surface of the straight linear portion formed by cutting the straight linear portion in a plane orthogonal to the first direction may be larger than a first area of a cut surface of the first connecting portion formed by cutting the first connecting portion in a plane orthogonal to the extending direction of the first connecting portion and a second area of a cut surface of the second connecting portion formed by cutting the second connecting portion in a plane orthogonal to the extending direction of the second connecting portion.
The straight linear portion is more susceptible to greater stress than the arcuate first and second connecting portions.
Therefore, by making the cross section of the straight linear portion larger than the first cross section of the first connecting portion and the second cross section of the second connecting portion, the strength of the straight linear portion is improved and damage to the straight linear portion can be prevented.
Further, in the Oldham ring according to one aspect of the present invention, the first connecting portion and the second connecting portion may be provided with an inner peripheral surface connected to the inner surfaces of the pair of straight linear portions and having a semicircular shape when viewed from the axial direction in which the axis extends, and an outer peripheral surface connected to the outer surfaces of the pair of straight linear portions and having a semicircular shape when viewed from the axial direction, the intermediate position of the inner peripheral surface and the outer peripheral surface of the first connecting portion is matched with the intermediate position of straight line connecting one end of the pair of straight linear portions connected to the first connecting portion, the intermediate position of the inner peripheral surface and the outer peripheral surface of the second connecting portion may be matched with the intermediate position of straight line connecting the other end of the pair of straight linear portions connected to the second connecting portion.
In this way, by matching the center positions of the inner and outer peripheral surfaces of the first connecting portion with the intermediate position of the straight line connecting one ends of the pair of straight linear portions connected to the first connecting portion, the inner surface of the pair of straight linear portions and the inner peripheral surface of the first connecting portion can be connected by a smooth surface, and the outer surface of the pair of straight linear portions and the outer peripheral surface of the first connecting portion can be connected by a smooth surface.
As a result, stress concentration can be suppressed on the boundary part between the inner surface of the pair of straight linear portions and the inner peripheral surface of the first connecting portion, and the boundary part between the outer surface of the pair of straight linear portions and the outer peripheral surface of the first connecting portion.
Further, by matching the center position of the inner and outer peripheral surfaces of the second connecting portion with the intermediate position of the straight line connecting the other ends of the pair of straight linear portions connected to the second connecting portion, the inner surface of the pair of straight linear portions and the inner peripheral surface of the second connecting portion can be connected by a smooth surface, and the outer surface of the pair of straight linear portions and the outer peripheral surface of the second connecting portion can be connected by a smooth surface.
As a result, stress concentration can be suppressed on the boundary part between the inner surface of the pair of straight linear portions and the inner peripheral surface of the second connecting portion, and the boundary part between the outer surface of the pair of straight linear portions and the outer peripheral surface of the second connecting portion.
Further, in the Oldham ring according to one aspect of the present invention includes a Oldham ring main body provided with a pair of straight linear portions extending in the first direction and facing each other in a second direction orthogonal to the first direction, a first connecting portion connecting one end of the pair of straight linear portions, and a second connecting portion connecting the other end of the pair of straight linear portions and facing the first connecting portion in the first direction; a first Oldham key is provided on each of the surfaces of the pair of straight linear portions arranged on one side of an axis of the Oldham ring main body orthogonal to the first direction and the second direction; and a second Oldham key is provided on each of the surfaces of the first connecting portion and the second connecting portion arranged on the other side of the axis, wherein a first distance between the pair of straight linear portions in the second direction is shorter than a second distance between the first connecting portion and the second connecting portion in the first direction, and the first Oldham key is arranged so as not to protrude outward from the outer surface of the straight linear portion.
In this way, by making the first distance between the pair of straight linear portions in the second direction shorter than the second distance between the first connecting portion and the second connecting portion in the first direction, the size of the Oldham ring and the orbiting scroll in the second direction can be reduced.
As a result, it is possible to reduce the size and weight of the Oldham ring and the orbiting scroll.
Further, by arranging the first Oldham key so as not to project outward from the outer surface of the straight linear portion, the size of the Oldham ring and the orbiting scroll in the second direction can be further reduced.
Further, in the Oldham ring according to one aspect of the present invention, the first Oldham key may have a first pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, the second Oldham key may have a second pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, the height of the first Oldham key in the axial direction in which the axis of the Oldham ring main body extends may be higher than the height of the second Oldham key in the axial direction.
In this way, by making the height of the first Oldham key in the axial direction of the Oldham ring main body higher than the height of the second Oldham key in the axial direction, the first pressure-receiving surface can make the area of the second pressure-receiving surface larger than the area of the second pressure-receiving surface without increasing the size of the Oldham ring.
As a result, the surface pressure received by the first pressure-receiving surface due to the load can be reduced, and damage to the first Oldham key can be suppressed.
Further, the scroll compressor according to one aspect of the present invention is a scroll compressor that compresses a fluid, and includes the Oldham ring, a shaft extending in the axial direction in which the axis of the Oldham ring main body extends; an orbiting scroll provided on the shaft and including an end plate in which formed with a groove into which the first Oldham key is inserted; a fixed scroll provided opposite to the orbiting scroll and forming a compression chamber for compressing the fluid between the rotating scroll; and a housing for housing the Oldham ring, the shaft, the orbiting scroll and the fixed scroll.
In this way, by providing the above-mentioned Oldham ring, the gap formed between the structure composed of the miniaturized Oldham ring and the orbiting scroll and the inner surface of the housing can be made large, so that the fluid can be easily moved in the direction in which the shaft extends.

[Advantageous Effects of Invention]

According to the present invention, it is possible to reduce the size and weight of the Oldham ring and the orbiting scroll while suppressing damage to the first Oldham key.

[Brief Description of Drawings]

[FIG.1] It is sectional drawing which shows the schematic structure of the scroll compressor which concerns on 1st Embodiment of this invention.
[FIG.2] It is a top view of the orbiting scroll shown in FIG. 1 as viewed from the shaft side.
[FIG.3] It is a top view of the Oldham ring shown in FIG. 1 as viewed from the turning scroll side.
[FIG.4] It is a side view which A views the Oldham ring shown in FIG.3.
[FIG.5] It is a top view which looked at the Oldham ring shown in FIG. 1 from the shaft side.
[FIG.6] It is a cross-sectional view of one straight linear portion shown in FIG. 3 in the A1-A2 line direction (a cross-sectional view when one straight linear portion is cut at a plane orthogonal to the direction in which one straight linear portion extends).
[FIG.7] It is a cross-sectional view of the other straight linear portion shown in FIG. 3 in the B1-B2 line direction (a cross-sectional view when the other straight linear portion is cut at a plane orthogonal to the direction in which the other straight linear portion extends).
[FIG.8] It is a cross-sectional view of the first connecting portion shown in FIG. 3 in the direction of E1-E2 (a cross-sectional view when the first connecting portion is cut at a plane orthogonal to the direction in which the first connecting portion extends).
[FIG.9] It is a cross-sectional view of the second connecting portion shown in FIG. 3 in the F1-F2 line direction (cross-sectional view when the second connecting portion is cut at a plane orthogonal to the direction in which the second connecting portion extends).
[FIG. 10] It is a top view which looked at the Oldham ring and the orbiting scroll shown in FIG.1.
[FIG.11] It is a top view which looked at the Oldham ring which concerns on 2nd Embodiment of this invention from the turning scroll side.
[FIG. 12] It is the figure which B-viewed the Oldham ring shown in FIG.11.
[FIG.13] It is a top view which looked at the Oldham ring which concerns on 3rd Embodiment of this invention from the turning scroll side.
[FIG.14] It is a top view which looked at the Oldham ring which concerns on 4th Embodiment of this invention from the turning scroll side.
[FIG. 15] It is the figure which C-viewed the Oldham ring shown in FIG.14.

[Description of Embodiments]

Hereinafter, embodiments to which the present invention has been applied will be described in detail with reference to the drawings.

(First Embodiment)

With reference to FIG.1, the scroll compressor 10 of the first embodiment will be described.
In FIG.1, O indicates the axis of the shaft main body 35 (hereinafter referred to as "axis O"), O1 indicates the eccentric axis of the eccentric shaft 36 (hereinafter referred to as "eccentric axis O1"), the X direction indicates the first direction, and Z direction indicates the height directions of the scroll compressor 10.
The scroll compressor 10 includes a housing 11, a suction pipe 13, a discharge pipe 15, a main bearing 17, a sub bearing 19, a shaft 21, an oil supply pump 22, a drive unit 23, and a scroll compressor main body 24, a bush assembly 25, and an Oldham ring 27.
The housing 11 has a closed structure and has a hollow part inside the housing 11.
The housing 11 has a tubular part 31, a bottom part 32, and a cover portion 33. The tubular part 31 is a member having a cylindrical shape and extends in the Z direction. The upper and lower ends of the tubular part 31 are open ends. The bottom part 32 is provided so as to close the lower end of the tubular part 31. The cover portion 33 is provided so as to close the upper end of the tubular part 31.
The housing 11 houses a main bearing 17, a sub bearing 19, a shaft 21, an oil supply pump 22, a drive unit 23, a scroll compressor main body 24, a bush assembly 25, and an Oldham ring 27. The inside of the housing 11 is divided by the scroll compressor main body 24 into a suction chamber 11A arranged below the scroll compressor main body 24 and a discharge chamber 11B arranged above the scroll compressor main body 24.
The suction pipe 13 is provided in the central part of the tubular part 31. The suction pipe 13 communicates with the suction chamber 11A formed in the housing 11. The suction pipe 13 causes a fluid (for example, a refrigerant gas which is a working fluid) to be introduced into the suction chamber 11A from the outside of the housing 11.
The discharge pipe 15 is provided on the cover portion 33. The discharge pipe 15 communicates with the discharge chamber 11B. When the scroll compressor 10 is used as an outdoor unit of a commercial multi air conditioner, the discharge pipe 15 is connected to, for example, a plurality of indoor units (not shown) to be used. The fluid compressed by the scroll compressor main body 24 (hereinafter, referred to as "high pressure fluid") is discharged to the discharge pipe 15. Then, the discharged high-pressure fluid is supplied to the destination.
The main bearing 17 is fixed to the inner wall of the housing 11. The main bearing 17 is arranged between the connecting position between the suction pipe 13 and the housing 11 and the scroll compressor main body 24. The main bearing 17 supports one end 35A of the shaft main body 35 extending in the axis O direction in a rotatable state.
The shaft 21 has a shaft main body 35 and an eccentric shaft 36. The shaft main body 35 has a cylindrical shape. The shaft main body 35 has one end 35A arranged on the scroll compressor main body 24 side and the other end 35B arranged on the bottom 32 side. The shaft main body 35 is supported by a main bearing 17 and a sub bearing 19 in a state of being rotatable around the axis O.
The eccentric shaft 36 is provided at one end 35A of the shaft main body 35. The eccentric shaft 36 has an eccentric axis O1 offset (eccentric) with respect to the axis O as a central axis. The eccentric shaft 36 is a columnar shaft smaller than the outer diameter of the shaft main body 35. The eccentric shaft 36 having such a configuration revolves around the axis O1 when the shaft main body 35 rotates around the axis O.
The oil supply pump 22 is provided below the sub bearing 19. The oil supply pump 22 supplies lubricating oil to the bearing main body constituting the main bearing 17 and the sub bearing 19.
The drive unit 23 is housed in the housing 11. The drive unit 23 is arranged so as to surround the outer peripheral surface of the central part of the rotary shaft main body 35. The drive unit 23 rotates the shaft main body 35.
The scroll compressor main body 24 is provided between the main bearing 17 and the discharge chamber 11B. The scroll compressor main body 24 has a fixed scroll 41 and an orbiting scroll 42.
The fixed scroll 41 is arranged between the orbiting scroll 42 and the discharge chamber 11B. The fixed scroll 41 has an end plate 45 and a fixed scroll lap 46.
The end plate 45 is a disk-shaped plate material and is fixed to the inner wall of the housing 11. The end plate 45 faces the orbiting scroll 42 arranged below the fixed scroll 41.
The end plate 45 has a discharge port 45A. The discharge port 45A is a hole formed so as to penetrate the center of the end plate 45 and extends in the Z direction. The discharge port 45A discharges the high-pressure fluid that has been compressed by the scroll compressor main body 24 into the discharge chamber 11B.
The fixed scroll lap 46 is provided on the surface (lower surface) of the end plate 45 facing the orbiting scroll 42. The fixed scroll lap 46 is erected in the Z direction. The fixed scroll lap 46 is a wall body formed in a spiral shape when viewed from the Z direction. As the fixing lap 46, for example, a plate-shaped member wound around the center of the end plate 45 can be used.
Next, the orbiting scroll 42 will be described with reference to FIGS. 1 and 2. In FIG. 2, the Y direction is the second direction, which is orthogonal to the X direction and the Z direction shown in FIG.1.
The orbiting scroll 42 is arranged between the fixed scroll 41 and the main bearing 17. The orbiting scroll 42 has an end plate 48, an orbiting scroll lap 49, a boss portion 51, and a groove 53.
The end plate 48 is a disk-shaped plate material and faces the end plate 45 in the Z direction. The orbiting scroll lap 49 is provided on the surface of the end plate 48 facing the end plate 45. The orbiting scroll lap 49 is erected in the Z direction. The orbiting scroll lap 49 is a wall body formed in a spiral shape when viewed from the Z direction. As the orbiting scroll lap 49, for example, a plate-shaped member wound around the center of the end plate 48 can be used.
The orbiting scroll lap 49 having the above configuration is arranged so as to mesh with the fixed scroll lap 46 described above. As a result, a compression chamber 24A, which is a space for compressing the fluid, is partitioned between the swirl lap 49 and the fixed scroll lap 46. The volume of the compression chamber 24A changes as the orbiting scroll lap 49 swivels with respect to the fixed scroll 41. As a result, the fluid (refrigerant) in the compression chamber 24A is compressed.
The boss portion 51 is provided at the center of the surface 48a of the end plate 48 facing the shaft 21. The boss portion 51 is a cylindrical member and projects in the direction toward the sub bearing 19. The boss portion 51 is arranged so as to surround the outer circumference of the eccentric shaft 36.
A bearing is provided on the inner peripheral surface of the boss portion 51. Lubricating oil is supplied to the bearing from the oil supply pump 22.
Two grooves 53 are formed on the surface 48a side of the end plate 48. The two grooves 53 face each other with the boss portion 51 in between in a plan view. The two grooves 53 extend to the outer circumference of the end plate 48.
With reference to FIG.1, the bush assembly 25 is provided between the orbiting scroll 42 and the shaft 21. The bush assembly 25 connects the orbiting scroll 42 and the shaft 21. The bush assembly 25 has a bush 25A provided between the eccentric shaft 36 and the boss portion 51.
Next, the Oldham ring 27 will be described with reference to FIGS.1 to 10. In FIG.3, C1 is an intermediate position of a straight line connecting one end 64A of the straight linear portion 64 and one end 65A of the straight linear portion 65 (hereinafter, referred to as "intermediate position C1"), C2 is the center position of the inner peripheral surface 67c and the outer peripheral surface 67d of the first connecting portion 67 formed in a semicircular shape (hereinafter referred to as "center position C2"), C3 is the intermediate position of the straight line connecting the other end 64B of the straight linear portion 64 and the other end 65B of the straight linear portion 65 (hereinafter referred to as "intermediate position C3"), and C4 is the center position of the inner peripheral surface 68c and the outer peripheral surface 68d of the second connecting portion 68 formed in a semicircular shape (hereinafter referred to as "center position C4").
Further, in FIG.3, L1 is the length of the first Oldham key 57 in the Y direction (hereinafter, referred to as "length L1"), L2 is the length of the first Oldham key 58 in the Y direction (hereinafter, "length L2"), L3 is the length of the second Oldham key 61 in the X direction (hereinafter referred to as "length L3"), and L4 is the length of the second Oldham key 62 in the X direction (hereinafter referred to as "length L4").
Further, in FIG.3, O2 is the axis of the Oldham ring main body 55 (hereinafter, referred to as "axis O2"), G1 is the width of the straight linear portion 64 in the direction in which the straight linear portion 64 extends (hereinafter, referred to as "width G1"), G2 is the width of the straight linear portion 65 in the direction in which the straight linear portion 65 extends (hereinafter referred to as "width G2"), G3 is the width of the first connecting portion 67 in the direction in which the first connecting portion 67 extends (hereinafter referred to as "width G3"), and G4 is the width of the second connecting portion 68 in the direction in which the second connecting portion 68 extends (hereinafter, referred to as "width G4").
Further, in FIG.3, W1 is the width of the first Oldham key 57 in the X direction (hereinafter referred to as "width W1"), W2 is the width of the first Oldham key 58 in the X direction (hereinafter referred to as "width W2"), W3 indicates the width of the second Oldham key 61 in the Y direction (hereinafter referred to as "width W3"), and W4 indicates the width of the second Oldham key 62 in the Y direction (hereinafter referred to as "width W4").
In FIG.4, the first Oldham key 57 hidden behind the first Oldham key 58 is shown by a dotted line. Further, in FIG.4, H1 is the height of the first Oldham key 57 in the axis O2 direction (Z direction) (hereinafter, referred to as "height H1"), H2 is height of the first Oldham key 58 in the axis O2 direction (Z direction) (hereinafter referred to as "height H2"), H3 is the height of the second Oldham key 61 in the axis O2 direction (Z direction) (hereinafter referred to as "height H3"), and H4 is the height of the second Oldham key 62 in the axis O2 direction (Z direction) (hereinafter, referred to as "height H4").
In FIG.3, the same components as those of the structure shown in FIG.1 are designated by the same reference numerals. In FIGS.3 to 9, the same components are designated by the same reference numerals. In FIG.10, the same components as those of the structures shown in FIGS.2 and 3 are designated by the same reference numerals.
The Oldham ring 27 is a member for suppressing the rotation of the orbiting scroll 42 (rotation around the eccentric axis O1) and is provided between the orbiting scroll 42 and the main bearing 17.
The Oldham ring 27 has an Oldham ring main body 55, a first Oldham key 57, 58, and a second Oldham key 61, 62.
The Oldham ring main body 55 has A pair of straight linear portions 64 and 65, a first connecting portion 67, and a second connecting portion 68.
The straight linear portions 64 and 65 extend in the X direction (first direction), respectively. The straight linear portions 64 and 65 are arranged so as to face each other in the Y direction (second direction) so as to be separated from each other.
The straight linear portion 64 has one end 64A and the other end 64B arranged in the X direction, surfaces 64a and 64b, an inner surface 64c, and an outer surface 64d. The surface 64a is a surface arranged on one side of the axis O2, and a part of the surface 64a faces the orbiting scroll 42 in the Z direction. The surface 64b is a surface arranged on the other side of the axis O2, and is arranged on the opposite side of the surface 64a.
The inner surface 64c is a surface facing the straight linear portion 65 in the Y direction. The outer surface 64d is a surface arranged on the opposite side of the inner surface 64c.
The cut surface 64e of the straight linear portion 64 formed by cutting the straight linear portion 64 on a plane (virtual plane) orthogonal to the X direction is a rectangle. The width of the straight linear portion 64 in the Y direction is the width G1. Further, the thickness of the straight linear portion 64 in the Z direction is set to the thickness M1.
The straight linear portion 65 has one end 65A and the other end 65B arranged in the X direction, surfaces 65a and 65b, an inner surface 65c, and an outer surface 65d. The surface 65a is a surface arranged on one side of the axis O2, and a part of the surface 65a faces the orbiting scroll 42 in the Z direction. The surface 65b is a surface arranged on the other side of the axis O2, and is arranged on the opposite side of the surface 65a.
The inner surface 65c is a surface facing the straight linear portion 64 in the Y direction. The outer surface 65d is a surface arranged on the opposite side of the inner surface 65c.
The cut surface 65e of the straight linear portion 65 formed by cutting the straight linear portion 65 on a plane (virtual plane) orthogonal to the X direction is rectangular. The width G2 of the straight linear portion 65 in the Y direction is configured to be equal to the width G1 of the straight linear portion 64.
Further, the thickness M2 of the straight linear portion 65 in the Z direction is configured to be equal to the thickness M1 of the straight linear portion 64.
The first connecting portion 67 connects one end 64A of the straight linear portion 64 and one end 65A of the straight linear portion 65. The first connecting portion 67 is a member having an arc shape.
By forming the first connecting portion 67 into an arc shape in this way, the stress received by the first connecting portion 67 can be reduced as compared with the case where the first connecting portion 67 is formed in a linear shape.
The first connecting portion 67 has surfaces 67a and 67b, an inner peripheral surface 67c, and an outer peripheral surface 67d.
The surface 67a is a surface arranged on one side of the axis O2. The surface 67b is a surface arranged on the other side of the axis O2 and is arranged on the opposite side of the surface 67a.
The inner peripheral surface 67c is a surface connected to the inner surfaces 64c and 65c of the straight linear portions 64 and 65. The inner peripheral surface 67c has a semicircular shape when viewed from the axis O2 direction.
The outer peripheral surface 67d is a surface connected to the outer surfaces 64d and 65d of the straight linear portions 64 and 65. The outer peripheral surface 67d has a semicircular shape when viewed from the axis O2 direction.
The center position C2 of the inner peripheral surface 67c and the outer peripheral surface 67d of the first connecting portion 67 is matched with the intermediate position C1 of the straight line connecting one end 64A of the straight linear portion 64 and one end 65A of the straight linear portion 65.
In this way, by matching the center position C2 of the inner peripheral surface 67c and the outer peripheral surface 67d of the first connecting portion 67 with the intermediate position C1 of the straight line connecting the one ends 64A and 65A, the inner surfaces 64c, 65c of the pair of straight linear portions 64, 65 and the inner peripheral surface 67c of the first connecting portion 67 can be connected with a smooth surface, and the outer surfaces 64d, 65d of the pair of straight linear portions 64, 65 and the outer peripheral surface 67d of the first connecting portion 67 can be connected with a smooth surface.
As a result, stress concentration can be suppressed at the boundary part between the inner surfaces 64c and 65c of the pair of straight linear portions 64 and 65 and the inner peripheral surface 67c of the first connecting portion 67, and at the boundary between the outer surfaces 64d and 65d of the pair of straight linear portions 64 and 65 and the outer peripheral surface 67d of the first connecting portion 67.
The cut surface 67e of the first connecting portion 67 formed by cutting the first connecting portion 67 on a plane (virtual surface) orthogonal to the extending direction of the first connecting portion 67 is formed to be rectangular.
The width G3 of the straight linear portion 64 orthogonal to the extending direction of the first connecting portion 67 is configured to be equal to the widths G1 and G2 of the straight lines 64 and 65.
Further, the thickness M3 of the first connecting portion 67 in the Z direction is configured to be equal to the thicknesses M1 and M2 of the straight linear portions 64 and 65.
The second connecting portion 68 connects the other end 64B of the straight linear portion 64 and the other end 65B of the straight linear portion 65. The second connecting portion 68 is a member having an arc shape.
By forming the second connecting portion 68 into an arc shape in this way, the stress received by the second connecting portion 68 can be reduced as compared with the case where the second connecting portion 68 is formed in a linear shape.
The second connecting portion 68 has surfaces 68a and 68b, an inner peripheral surface 68c, and an outer peripheral surface 68d.
The surface 68a is a surface arranged on one side of the axis O2. The surface 68b is a surface arranged on the other side of the axis O2 and is arranged on the opposite side of the surface 68a.
The inner peripheral surface 68c is a surface connected to the inner surfaces 64c and 65c of the straight linear portions 64 and 65. The inner peripheral surface 68c has a semicircular shape when viewed from the axis O2 direction.
The outer peripheral surface 68d is a surface connected to the outer surfaces 64d and 65d of the straight linear portions 64 and 65. The outer peripheral surface 68d has a semicircular shape when viewed from the axis O2 direction.
The center position C4 of the inner peripheral surface 68c and the outer peripheral surface 68d of the second connecting portion 68 coincides with the intermediate position C3 of the straight line connecting the other end 64B of the straight linear portion 64 and the other end 65B of the straight linear portion 65.
In this way, by matching the center position C4 of the inner peripheral surface 68c and the outer peripheral surface 68d of the second connecting portion 68 with the intermediate position C3 of the straight line connecting the other ends 64B and 65B, the inner surfaces 64c, 65c of the pair of straight linear portions 64, 65 and the inner peripheral surface 68c of the second connecting portion 68 can be connected with a smooth surface, and outer surfaces 64d, 65d of the pair of straight linear portions 64, 65 and the outer peripheral surface 68d of the second connecting portion 68 can be connected with a smooth surface.
As a result, stress concentration can be suppressed at the boundary part between the inner surfaces 64c and 65c of the pair of straight linear portions 64 and 65 and the inner peripheral surface 68c of the second connecting portion 68, and at the boundary between the outer surfaces 64d and 65d of the pair of straight linear portions 64 and 65 and the outer peripheral surface 68d of the second connecting portion 68.
The cut surface 68e of the second connecting portion 68 formed by cutting the second connecting portion 68 on a plane (virtual surface) orthogonal to the extending direction of the second connecting portion 68 is formed to be rectangular.
The width G4 of the straight linear portion 64 orthogonal to the extending direction of the second connecting portion 68 is configured to be equal to the widths G1 and G2 of the straight linear portions 64 and 65 and the width G3 of the first connecting portion 67.
Further, the thickness M4 of the second connecting portion 68 in the Z direction is configured to be equal to the thicknesses M1 and M2 of the straight linear portions 64 and 65 and the thickness M3 of the first connecting portion 67.
Therefore, in the first embodiment, the areas of the cut surfaces 64e and 65e of the straight linear portions 64 and 65, the first area of the cut surface 67e of the first connecting portion 67, and the cut surface 68e of the second connecting portion 68. The second areas of the above are configured to be equal.
The first Oldham key 57 is provided on the surface 64a located at the center of the straight linear portion 64.
The first Oldham key 57 is inserted into one of the two grooves 53 of the orbiting scroll 42.
The first Oldham key 57 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 57a for receiving a load.
The first Oldham key 57 projects to the outside of the outer surface 64d of the straight linear portion 64. The length L1 of the first Oldham key 57 in the Y direction is configured to be larger than the width G1 of the straight linear portion 64.
The first Oldham key 58 is provided on the surface 65a located at the center of the straight linear portion 65. The first Oldham key 58 faces the first Oldham key 57 in the Y direction. The first Oldham key 58 is inserted into the other groove 53 of the two grooves 53 of the orbiting scroll 42.
The first Oldham key 58 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 58a for receiving a load.
The first Oldham key 58 projects to the outside of the outer surface 65d of the straight linear portion 65. The length L2 of the first Oldham key 58 in the Y direction is configured to be larger than the width G2 of the straight linear portion 65.
The width W2 of the first Oldham key 58 in the X direction is configured to be equal to the width W1 of the first Oldham key 57. Further, the height H2 of the first Oldham key 58 is configured to be equal to the height H1 of the first Oldham key 57.
The lengths L1 and L2 of the first Oldham keys 57 and 58 are configured to be longer than the lengths L3 and L4 of the second Oldham keys 61 and 62.
The second Oldham key 61 is provided on a surface 67a located at the center of the first connecting portion 67. The second Oldham key 61 is inserted into a groove (not shown) formed in the fixed scroll 41.
The second Oldham key 61 is arranged in the circumferential direction of the Oldham ring main body 55 and has a second pressure-receiving surface 61a for receiving a load.
The second Oldham key 61 projects outward from the outer peripheral surface 67d of the first connecting portion 67 in the X direction. The length L3 of the second Oldham key 61 in the X direction is configured to be larger than the width G3 of the first connecting portion 67.
The width W3 of the second Oldham key 61 in the Y direction is configured to be equal to the widths W1 and W2 of the first Oldham keys 57 and 58. Further, the height H3 of the second Oldham key 61 is configured to be equal to the heights H1 and H2 of the first Oldham keys 57 and 58.
The second Oldham key 62 is provided on a surface 68a located at the center of the second connecting portion 68. The second Oldham key 62 faces the second Oldham key 61 in the X direction.
The second Oldham key 62 is inserted into a groove (not shown) formed in the fixed scroll 41. The second Oldham key 62 is arranged in the circumferential direction of the Oldham ring main body 55 and has a second pressure-receiving surface 62a that receives a load.
The second Oldham key 62 projects to the outside of the outer peripheral surface 68d of the second connecting portion 68. The length L4 of the second Oldham key 62 in the Y direction is configured to be larger than the width G4 of the second connecting portion 68.
The width W4 of the second Oldham key 62 in the Y direction is configured to be equal to the widths W1 and W2 of the first Oldham keys 57 and 58 and the width W3 of the second Oldham key 61.
Further, the height H4 of the second Oldham key 62 is configured to be equal to the heights H1 and H2 of the first Oldham keys 57 and 58 and the height H3 of the second Oldham key 62.
That is, the first and second Oldham keys 57, 58, 61, 62 are Oldham keys having different lengths and the same width and height.
In the Oldham ring 27 of the first embodiment, the first distance D1 between the pair of straight linear portions 64, 65 in the Y direction is configured to be shorter than the second distance D2 between the first connecting portion 67 and the second connecting portion 68 in the X direction.
In this way, the first distance D1 between the pair of straight linear portions 64, 65 in the Y direction is made shorter than the second distance D2 between the first connecting portion 67 and the second connecting portion 68 in the X direction. This makes it possible to reduce the size of the Oldham ring 27 and the orbiting scroll 42 in the Y direction.
As a result, the Oldham ring 27 and the orbiting scroll 42 can be made smaller and lighter.
On the other hand, when the first distance D1 is shorter than the second distance D2, the first pressure-receiving surfaces 57a and 58a receive a load larger than the load received by the second pressure-receiving surfaces 61a and 62a.
However, as described above, the lengths L1 and L2 of the first Oldham keys 57 and 58 are configured to be longer than the lengths L3 and L4 of the second Oldham keys 61 and 62.
In this way, by making the lengths L1 and L2 of the first Oldham keys 57 and 58 longer than the lengths L3 and L4 of the second Oldham keys 61 and 62, the area of the first pressure-receiving surfaces 57a and 58a can be made larger than the area of the second pressure-receiving surfaces 61a and 62a.
As a result, the surface pressure (surface pressure due to the load) of the first pressure-receiving surfaces 57a, 58a that receives a load larger than the load received by the second pressure-receiving surfaces 61a, 62a is reduced, and the first Oldham key 57 damage can be suppressed.
According to the Oldham ring 27 of the first embodiment, as described above, the first distance D1 between the pair of straight linear portions 64, 65 in which the first Oldham keys 57, 58 are arranged is shorter than the second distance D2 between the first connecting portion 67 in which the second Oldham key 61 is arranged and the second connecting portion 68 in which the second Oldham key 62 is arranged, the size and weight of the Oldham ring 27 and the orbiting scroll 42 can be reduced.
Further, by making the lengths L1 and L2 of the first Oldham keys 57 and 58 longer than the lengths L3 and L4 of the second Oldham keys 61 and 62, the area of the second pressure-receiving surface 61a of the second Oldham keys 61 and 62 , the area of the first pressure-receiving surfaces 57a, 58a of the first Oldham keys 57, 58 can be made larger than the area of the second pressure-receiving surface 61a, 62a of the second Oldham keys 61 and 62.
As a result, it is possible to reduce the surface pressure received by the first pressure-receiving surfaces 57a and 58a due to the load, so that damage to the first Oldham keys 57 and 58 can be suppressed.
Further, according to the scroll compressor 10 provided with the Oldham ring 27, by having the miniaturized Oldham ring 27 and the orbiting scroll 42, the gap formed between the Oldham ring 27 and the orbiting scroll 42 and the inner surface of the housing 11 can be enlarged.
As a result, the fluid can be easily moved in the Z direction in which the shaft 21 extends.
In the first embodiment, as an example, the case where the thicknesses M1 and M2 of the straight linear portions 64 and 65 and the thicknesses M3 and M4 of the first and second connecting portions 67 and 68 are equal, the widths G1 and G2 of the straight linear portions 64, 65 and the widths G3 and G4 of the first and second connecting portions 67 and 68 are equal has been described ,but for example, the thicknesses M1 and M2 of the straight linear portions 64 and 65 are made thicker than the thicknesses M3 and M4 of the first and second connecting portions 67 and 68, or the widths G1 and G2 of the straight linear portions 64 and 65 are made wider than the widths of the first and second connecting portions 67 and 68, is used, the cross-sectional area of the cut surfaces 64e and 65e of the straight linear portions 64 and 65 may be made larger than the first cross-sectional area of the cut surface 67e of the first connecting portion 67 and the second cross-sectional area of the cut surface 68e of the second connecting portion 68.
In this way, by making the cross-sectional area of the cut surfaces 64e and 65e of the straight linear portions 64, 65 larger than the first cross-sectional area of the cut surface 67e of the first connecting portion 67 and the second cross-sectional area of the second of the cut surfaces 68e of the second connecting portion 68, the strength of the straight linear portions 64, 65 is improved, and damage to the straight linear portions 64, 65 can be suppressed.

(Second Embodiment)

The Oldham Ring 75 of the second embodiment will be described with reference to FIGS. 11 and 12.
In FIG.11, L5 indicates the length of the first Oldham key 76 in the Y direction (hereinafter referred to as "length L1"), and L6 indicates the length of the first Oldham key 77 in the Y direction (hereinafter referred to as "length L2"). In FIG. 11, the same components as those of the structure shown in FIG.3 are designated by the same reference numerals.
In FIG.12, H5 indicates the height of the first Oldham key 76 in the axis O2 direction (Z direction) (hereinafter, referred to as "height H5"), and H6 indicates the height of the first Oldham key 77 in the axis O2 direction (Z direction) (Hereinafter, referred to as "height H6"). In FIG.12, the same components as those of the structures shown in FIGS.4 and 11 are designated by the same reference numerals.
The Oldham ring 75 is configured in the same manner as the Oldham ring 27 of the first embodiment except that it has the first Oldham keys 76, 77 in place of the first Oldham keys 57, 58 constituting the Oldham ring 27.
The first Oldham key 76 is configured in the same manner as the Oldham key 57 except that the length L5 is shorter than the length L1 of the first Oldham key 57 and the height H5 is higher than the height H1 of the first Oldham key 57.
The length L5 of the first Oldham key 76 can be made the same length as the lengths L3 and L4 of the second Oldham keys 61 and 62, for example.
The first Oldham key 76 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 76a having a larger area than the second pressure-receiving surfaces 61a and 62a.
The first Oldham key 77 is configured in the same manner as the first Oldham key 58 except that the length L6 is shorter than the length L2 of the first Oldham key 58 and the height H6 is higher than the height H2 of the first Oldham key 58.
The length L6 of the first Oldham key 77 can be made the same length as the lengths L3 and L4 of the second Oldham keys 61 and 62 and the length L5 of the first Oldham key 76, for example.
The first Oldham key 77 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 77a having a larger area than the second pressure-receiving surfaces 61a and 62a.
According to the Oldham Ring 75 of the second embodiment, by making the heights H5 and H6 of the first Oldham keys 76, 77 higher than the heights H3 and H4 of the second Oldham keys 61, 62 without making the lengths L5 and L6 of the first Oldham keys 76, 77 longer than the lengths L3 and L4 of the second Oldham keys 61,62, the area of the first pressure-receiving surface 76a, 77a can be made larger than the area of the second pressure-receiving surfaces 61a, 62a without making the size of the Oldham ring 75 larger in the Y direction, and the surface pressure received by the first pressure-receiving surfaces 76a, 77a due to the load can be reduced.
As a result, it is possible to reduce the size and weight of the Oldham ring 75 and the orbiting scroll while suppressing damage to the first Oldham keys 76 and 77.

(Third Embodiment)

The Oldham Ring 80 of the third embodiment will be described with reference to FIG.13.
In FIG.13, W5 indicates the width of the first Oldham key 81 in the X direction (hereinafter referred to as "width W5"), and W6 indicates the length of the first Oldham key 82 in the X direction (hereinafter referred to as "width W6"). In FIG.13, the same components as those of the structure shown in FIG.11 are designated by the same reference numerals.
The Oldham ring 80 is configured in the same manner as the Oldham ring 27 of the second embodiment except that it has the first Oldham keys 81 and 82 in place of the first Oldham keys 76 and 77 constituting the Oldham ring 75.
The first Oldham key 81 is configured in the same manner as the first Oldham key 76 except that it has a width W5 wider than the width W1 of the first Oldham key 76.
The first Oldham key 81 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 81a having a larger area than the second pressure-receiving surfaces 61a and 62a.
The first Oldham key 82 is configured in the same manner as the first Oldham key 77 except that it has a width W6 wider than the width W2 of the first Oldham key 77.
The first Oldham key 82 is arranged in the circumferential direction of the Oldham ring main body 55 and has a first pressure-receiving surface 82a having a larger area than the second pressure-receiving surfaces 61a and 62a.
According to the Oldham ring 80 of the third embodiment, by making the widths W5 and W6 of the first Oldham keys 81 and 82 wider than the widths W3 and W4 of the second Oldham keys 61 and 62 without making the lengths L5 and L6 of the first Oldham keys 76, 77 longer than the lengths L3 and L4 of the second Oldham keys 61,62, the area of the first pressure-receiving surface 81a, 82a can be made larger than the area of the second pressure-receiving surfaces 61a, 62a without making the size of the Oldham ring 80 larger in the Y direction, and the surface pressure received by the first pressure-receiving surfaces 81a, 82a due to the load can be reduced.
As a result, it is possible to reduce the size and weight of the Oldham ring 80 and the orbiting scroll while suppressing damage to the first Oldham keys 81 and 82.

(Fourth Embodiment)

The Oldham Ring 85 of the fourth embodiment will be described with reference to FIGS. 14 and 15.
In FIG.14, L7 indicates the length of the first Oldham key 86 in the Y direction (hereinafter referred to as "length L7"), and L8 indicates the length of the first Oldham key 87 in the Y direction (hereinafter referred to as "length L7"). In FIG.13, the same components as those of the structure shown in FIG.3 are designated by the same reference numerals.
In FIG.15, H7 indicates the height of the first Oldham key 86 in the axis O2 direction (hereinafter, referred to as "height H7"), and H8 indicates the height of the first Oldham key 87 in the axis O2 direction (hereinafter, "height H8"). In FIG. 15, the same components as those of the structures shown in FIGS. 4 and 14 are designated by the same reference numerals.
The Oldham ring 85 is configured in the same manner as the Oldham ring 27 of the first embodiment except that it has the first Oldham keys 86, 87 in place of the first Oldham keys 57, 58 constituting the Oldham ring 27.
The first Oldham key 86 is configured in the same manner as the first Oldham key 57 except that the length L7 in the Y direction has the same size as the width G1 of the straight linear portion 64 so as not to protrude to the outside of the outer surface 64d of the straight linear portion 64, and the height H7 is higher than the height H1 of the first Oldham key 57 and the heights H3 and H4 of the second Oldham keys 61, 62.
The first Oldham key 86 has a first pressure-receiving surface 86a arranged in the circumferential direction of the Oldham ring main body 55.
The first Oldham key 87 is configured in the same manner as the first Oldham key 58 except that the length L8 in the Y direction has the same size as the width G2 of the straight linear portion 65 so as not to protrude to the outside of the outer surface 65d of the straight linear portion 65, and the height H8 is higher than the height H2 of the first Oldham key 58 and the heights H3 and H4 of the second Oldham keys 61, 62.
The first Oldham key 87 has a first pressure-receiving surface 87a arranged in the circumferential direction of the Oldham ring main body 55.
According to the Oldham ring 85 of the fourth embodiment, by making the length L7, L8 of the first Oldham keys 86, 87 equal to the widths G1 and G2 of the straight linear portions 64, 65 and making the height H1, H2 of the first Oldham keys 86, 87 higher than the height H3, H4 of the second Oldham keys 61, 62 so that the first Oldham keys 86, 87 do not protrude to the outside of the outer surfaces 64d, 65d of the straight linear portions 64, 65, the area of the first pressure-receiving surface 86a, 87a can be made larger than the area of the second pressure-receiving surfaces 61a, 62a without making the size of the Oldham ring 85 larger in the Y direction, and the surface pressure received by the first pressure-receiving surfaces 81a, 82a due to the load can be reduced.
As a result, it is possible to reduce the size and weight of the Oldham ring 85 and the orbiting scroll while suppressing damage to the first Oldham keys 86 and 87.
Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.
In the first embodiment, by making the length L1, L2 of the first Oldham keys 57, 58 longer than the lengths L3, L4 of the second Oldham keys 61, 62, the area of the first pressure-receiving surfaces 57a, 58a are made longer than the area of the second pressure-receiving surfaces 61a, 62a, in the second embodiment, by making the heights H5, H6 of the first Oldham keys 76, 77 longer than the heights L3, L4 of the second Oldham keys 61, 62, the area of the first pressure-receiving surfaces 76a, 77a are made longer than the area of the second pressure-receiving surfaces 61a, 62a, in the third embodiment, by making the widths W5, W6 of the first Oldham keys 81, 82 longer than the widths W3, W4 of the second Oldham keys 61, 62, the area of the first pressure-receiving surfaces 81a, 82a are made longer than the area of the second pressure-receiving surfaces 61a, 62a. However, for example, by appropriately combining these three forms (length, height, width), the area of the first pressure-receiving surface of the first Oldham key may be larger than the area of the second pressure-receiving surface.
Further, in the first to fourth embodiments, as an example, as shown in FIG.1, the case where the Oldham rings 27, 75, 80, 85 are arranged below the orbiting scroll 42 has been described. However, for example, the Oldham rings 27, 75, 80, 85 may be arranged between the fixed scroll 41 and the orbiting scroll 42. In this case, the second Oldham keys 61, 62 of the Oldham rings 27, 75, 80, 85 are inserted into the grooves (not shown) formed in the fixed scroll 41.
Further, in the first to fourth embodiments, the case where the first and second connecting portions 67 and 68 have an arc shape has been described as an example, but the shapes of the first and second connecting portions 67 and 68 may have a shape other than the arc shape. Specifically, the shapes of the first and second connecting portions 67 and 68 may be formed by one straight linear portion, or a plurality of straight linear portions extending in the directions intersecting each other may be connected to each other.

[Industrial Applicability]

The present invention is applicable to Oldham rings and scroll compressors.

[Reference Signs List]

10: Scroll compressor
11: Housing
11A: Suction chamber
11B: Discharge chamber
13: Suction pipe
15: Discharge pipe
17: Main bearing
19: Sub bearing
21: Shaft
22: Oil supply pump
23: Drive unit
24: Scroll compressor main body
24A: Compression chamber
25: Bush assembly
27, 75, 80, 85: Oldham ring
31: Tubular part
32: Bottom part
33: Cover portion
35: Shaft main body
35A: One end
35B: The other end
36: Eccentric shaft
41: Fixed scroll
42: Orbiting scroll
45, 48: End plate
45A: Discharge port
46: Fixed lap
48a, 64a, 64b, 65a, 65b, 67a, 67b, 68a, 68b: Surface
49: Orbiting lap
51: Boss portion
53: Groove
55: Oldham ring main body
57, 58, 76, 77, 81, 82, 86, 87: First Oldham key
57a, 58a, 76a, 77a, 81a, 82a, 86a, 87a: First pressure-receiving surface
61, 62: Second Oldham key
61a, 62a: Second pressure-receiving surface
64, 65: Straight linear portion
64A, 65A: One end
64B, 65B: The other end
64c, 65c: Inner surface
64d, 65d: Outer surface
64e, 65e, 67e, 68e: Cut surface
67: First connecting portion
67c, 68c: Inner peripheral surface
67d, 68d: Outer peripheral surface
68: Second connecting portion
C1, C3: Intermediate position
C2, C4: Center position
D1: first distance
D2: second distance
G1 to G4, W1 to W6: Width
H1 to H8: Height
L1 to L8: Length
M1 to: M4 Thickness
O, O2: Axis
O1: Eccentric axis

Claims

An Oldham ring comprising:
an Oldham ring main body provided with a pair of straight linear portions extending in the first direction and facing each other in a second direction orthogonal to the first direction, a first connecting portion connecting one end of the pair of straight linear portions and a second connecting portion connecting the other end of the pair of straight linear portions and facing the first connecting portion in the first direction;

a first Oldham key provided on each of the surfaces of the pair of straight linear portions arranged on one side of an axis of the Oldham ring main body orthogonal to the first direction and the second direction and having a first pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, and receiving a load; and

a second Oldham key provided on each of the surfaces of the first connecting portion and the second connecting portion arranged on the other side of the axis and having a second pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body, and receiving a load, wherein

a first distance between the pair of straight linear portions in the second direction is shorter than a second distance between the first connecting portion and the second connecting portion in the first direction, and

the area of the first pressure-receiving surface is larger than the area of the second pressure-receiving surface.
The Oldham ring according to claim 1, wherein
the height of the first Oldham key is higher than the height of the second Oldham key in the axial direction in which the axis extends.
The Oldham ring according to claim 1 or 2, wherein
the length of the first Oldham key in the second direction is longer than the length of the second Oldham key in the first direction.
The Oldham ring according to any one of claims 1 to 3, wherein
the width of the first Oldham key in the first direction is wider than the width of the second Oldham key in the second direction.
The Oldham ring according to any one of claims 1 to 4, wherein
the first Oldham key is arranged so as not to protrude outward from the outer surface of the straight linear portion.
The Oldham ring according to any one of claims 1 to 5, wherein
the first connecting portion and the second connecting portion each have a circular arc shape.
The Oldham ring according to claim 6, wherein
an area of a cut surface of the straight linear portion formed by cutting the straight linear portion in a plane orthogonal to the first direction is larger than a first area of a cut surface of the first connecting portion formed by cutting the first connecting portion in a plane orthogonal to the extending direction of the first connecting portion and a second area of a cut surface of the second connecting portion formed by cutting the second connecting portion in a plane orthogonal to the extending direction of the second connecting portion.
The Oldham ring according to claim 6 or 7, wherein
the first connecting portion and the second connecting portion are provided with an inner peripheral surface connected to the inner surfaces of the pair of straight linear portions and having a semicircular shape when viewed from the axial direction in which the axis extends, and an outer peripheral surface connected to the outer surfaces of the pair of straight linear portions and having a semicircular shape when viewed from the axial direction,
the intermediate position of the inner peripheral surface and the outer peripheral surface of the first connecting portion is matched with the intermediate position of straight line connecting one end of the pair of straight linear portions connected to the first connecting portion,
the intermediate position of the inner peripheral surface and the outer peripheral surface of the second connecting portion is matched with the intermediate position of straight line connecting the other end of the pair of straight linear portions connected to the second connecting portion.
An Oldham ring comprising:
a Oldham ring main body provided with a pair of straight linear portions extending in the first direction and facing each other in a second direction orthogonal to the first direction, a first connecting portion connecting one end of the pair of straight linear portions, and a second connecting portion connecting the other end of the pair of straight linear portions and facing the first connecting portion in the first direction,

a first Oldham key is provided on each of the surfaces of the pair of straight linear portions arranged on one side of an axis of the Oldham ring main body orthogonal to the first direction and the second direction; and

a second Oldham key is provided on each of the surfaces of the first connecting portion and the second connecting portion arranged on the other side of the axis, wherein

a first distance between the pair of straight linear portions in the second direction is shorter than a second distance between the first connecting portion and the second connecting portion in the first direction, and
the first Oldham key is arranged so as not to protrude outward from the outer surface of the straight linear portion.
The Oldham ring according to claim 9, wherein
the first Oldham key has a first pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body,
the second Oldham key has a second pressure-receiving surface arranged in the circumferential direction of the Oldham ring main body,
the height of the first Oldham key in the axial direction in which the axis of the Oldham ring main body extends is higher than the height of the second Oldham key in the axial direction.
A scroll compressor that compresses a fluid, the scroll compressor comprising:
the Oldham ring according to any one of claims 1 to 10;

a shaft extending in the axial direction in which the axis of the Oldham ring main body extends;

an orbiting scroll provided on the shaft and including an end plate in which formed with a groove into which the first Oldham key is inserted;

a fixed scroll provided opposite to the orbiting scroll and forming a compression chamber for compressing the fluid between the rotating scroll; and

a housing for housing the Oldham ring, the shaft, the orbiting scroll and the fixed scroll.