DRIVE ELEMENT FOR SCROLL COMPRESSORS AND SCROLL COMPRESSORS

Abstract

The present invention discloses a drive element for a scroll compressor and a scroll compressor having this drive element. The drive element comprises a hub portion having an internal bore, the hub portion having a first end and a second end opposite each other, a flange portion extending radially outward from the first end of the hub portion, the flange portion having a surface facing in a direction from the first end to the second end, the surface of the flange portion having an annular thrust surface and an oil groove. Due to the oil groove provided on the annular thrust surface of the drive element according to the invention, more lubricating oil can be retained on the thrust surface, thereby improving the lubricating performance of the scroll compressor at high speeds.

Description

TECHNICAL FIELD

[0001] Embodiments of the present invention relate to a drive element for a scroll compressor and a scroll compressor having such a drive element. TECHNICAL BACKGROUND

[0002] A conventional scroll compressor has a fixed scroll and an orbiting scroll. The fixed scroll has an end plate and a fixed scroll wrap protruding from the end plate. The orbiting scroll has an end plate and an orbiting scroll protruding from the end plate of the orbiting scroll. The orbiting scroll wrap and the fixed scroll wrap together form a compression chamber for compressing a medium. A motor drives the orbiting scroll via a drive shaft to compress the medium in the compression chamber. SUMMARY OF THE INVENTION

[0003] Embodiments of the present invention provide a drive element for a scroll compressor and a scroll compressor having such a drive element that can improve lubrication between the driven scroll of the scroll compressor and the drive element.

[0004] An embodiment of the present invention provides a drive element for a scroll compressor, comprising: a hub portion having an internal bore, the hub portion having a first end and a second end opposite each other; and a flange portion extending outwardly from the first end of the hub portion in a radial direction of the hub portion, the flange portion having a surface facing in a direction from the second end to the first end, the surface of the flange portion having an annular thrust surface and an oil groove.

[0005] According to one embodiment of the present invention, the oil groove comprises a first oil groove on the annular thrust surface of the surface of the flange portion, the first oil groove extends laterally in a direction from a radial inner side of the annular thrust surface to a radial outer side of the annular thrust surface and extends laterally through a portion of the annular thrust surface, the first oil groove is spaced from a radial outer edge of the annular thrust surface in the radial direction of the hub portion.

[0006] According to one embodiment of the present invention, the first oil groove extends in a radial direction.

[0007] According to one embodiment of the present invention, the first oil groove extends from a radial inner edge of the annular thrust surface.

[0008] According to one embodiment of the present invention, the annular thrust surface extends from an edge of the inner bore of the hub portion in the radial direction of the hub portion.

[0009] According to one embodiment of the present invention, the first oil groove extends from the edge of the inner bore of the hub portion toward the radial outer side of the annular thrust surface and communicates with the inner bore.

[0010] According to an embodiment of the present invention, the oil groove further comprises a second oil groove arranged on the surface of the portion of the flange at a radially outer side of the annular thrust surface of the surface of the portion of the flange, and the second oil groove extends around the annular thrust surface.

[0011] According to an embodiment of the present invention, a depth of the second oil groove is greater than a depth of the first oil groove.

[0012] According to one embodiment of the present invention, the oil groove further comprises a second oil groove arranged on the surface of the portion of the flange on the radially outer side of the annular thrust surface of the surface of the portion of the flange, and the second oil groove extends around the annular thrust surface.

[0013] According to one embodiment of the present invention, the second oil groove is a closed annular oil groove.

[0014] According to one embodiment of the present invention, the drive element further comprises a retaining ring arranged in the second oil groove.

[0015] According to one embodiment of the present invention, the retaining ring has a rectangular cross-section.

[0016] According to one embodiment of the present invention, the retaining ring has a C-shaped cross-section and an opening facing a rotation axis of the drive element.

[0017] According to one embodiment of the present invention, the drive element further comprises an eccentric ring opening in the surface of the flange portion, wherein a portion of the second oil groove corresponding to the eccentric ring opening is arranged on the inside of the eccentric ring opening in the radial direction of the hub portion.

[0018] According to one embodiment of the present invention, the drive element further comprises an eccentric annular opening in the surface of the flange portion, wherein the second oil groove comprises a plurality of second oil groove portions, each of the plurality of second oil groove portions is arranged between adjacent eccentric annular openings, and one end of each of the plurality of second oil groove portions communicates with the eccentric annular opening.

[0019] According to an embodiment of the present invention, the second oil groove extends along a circle, and a center of the circle lies on a rotation axis of the drive element.

[0020] According to one embodiment of the present invention, a bore extending through the portion of the flange for oil outlet is arranged on the radially outer side of the annular thrust surface of the surface of the portion of the flange.

[0021] According to one embodiment of the present invention, the drive element further comprises an annular wedge-shaped projection protruding from the annular thrust surface of the surface of the flange portion, wherein a cross-section of the wedge-shaped projection in the radial direction has a wedge-shaped shape and the wedge-shaped projection has a wedge-shaped projection surface facing axially outward. In the cross-section in the radial direction, a first location of the wedge-shaped projection of the wedge-shaped projection surface has the greatest axial distance in the radial direction from the surface of the flange portion, and a second location of the wedge-shaped projection in the radial direction has zero axial distance from the surface of the flange portion.

[0022] According to one embodiment of the present invention, the first wedge-shaped projection location is arranged on a radially outer side of the second wedge-shaped projection location.

[0023] According to one embodiment of the present invention, the second wedge-shaped projection location is arranged at an edge of the inner bore of the hub portion.

[0024] According to one embodiment of the present invention, an axial distance between the surface of the wedge-shaped projection portion and the surface of the flange portion at the first wedge-shaped projection location is in a range of 0.1 micrometer to 1 millimeter.

[0025] An embodiment of the present invention further provides a scroll compressor comprising: the drive element described above.

[0026] An embodiment of the present invention further provides a scroll compressor comprising: a first scroll having a first end plate and a first scroll wrap projecting downward from the first end plate; a second scroll having a second end plate and a second scroll wrap projecting upward from the second end plate, the second scroll and the first scroll cooperating to form a compression space for compressing refrigerant; a motor; the drive member described above, wherein the drive member is disposed below the second scroll, and the motor drives the first scroll for rotation via the drive member, the first scroll drives the second scroll for rotation, and the second end plate of the second scroll is rotatably supported on the flange portion of the drive member; and a support on which the drive member is rotatably supported.

[0027] According to one embodiment of the present invention, the scroll compressor further comprises: a scroll cover having an end plate with a central bore and a cylindrical portion extending downward from an outer periphery of the end plate, wherein the cylindrical portion of the scroll cover is connected to the flange portion of the drive member, and the end plate of the scroll cover is connected to the first end plate of the first scroll.

[0028] According to one embodiment of the present invention, the scroll compressor further comprises a fixed shaft, a lower end of the fixed shaft being fixed to the bracket, and the hub portion of the drive member being rotatably mounted on the fixed shaft.

[0029] According to one embodiment of the present invention, the inner bore of the drive element has a stepped portion or a concave-convex connecting portion.

[0030] By providing oil grooves and / or wedge-shaped projections on the annular thrust surface of the drive element, the lubrication performance between the driven scroll and the drive element of the scroll compressor can be improved at high speeds. Short description of the characters Fig. 1 is a schematic cross-sectional view of a scroll compressor according to an embodiment of the present invention; Fig. 1A is a schematic cross-sectional view of a scroll compressor according to another embodiment of the present invention; Fig. 2 is a schematic perspective view of a drive element of a scroll compressor according to an embodiment of the present invention; Fig. 3 is a schematic plan view of the drive element of the Fig. 2 scroll compressor shown; Fig. Figure 4 is a schematic cross-sectional view of the drive element of the scroll compressor along the line AA in Fig. 3; Fig. 5 is a partially enlarged schematic cross-sectional view of the drive element of the scroll compressor of Fig. 4; Fig. 6 is a schematic perspective view of a drive element of a scroll compressor according to an embodiment of the present invention; Fig. Figure 7 is a schematic plan view of the drive element of the scroll compressor of Fig. 6; Fig. Figure 8 is a schematic cross-sectional view of the drive element of the scroll compressor along the line BB in Fig. 7; Fig. 9 is a schematic perspective view of a drive element of a scroll compressor according to an embodiment of the present invention; Fig. 10 is a schematic plan view of the drive element of the scroll compressor of Fig. 9; Fig. Figure 11 is a schematic cross-sectional view of the drive element of the scroll compressor along the line CC in Fig. 10; Fig. 12 i is a schematic perspective view of the drive element of a scroll compressor according to an embodiment of the present invention; Fig. 13 is a schematic plan view of the drive element of the scroll compressor of Fig. 12; Fig. Figure 14 is a schematic cross-sectional view of the drive element of the scroll compressor along the line DD in Fig. 13; Fig. 15 is a schematic perspective view of the drive element of a scroll compressor according to an embodiment of the present invention; Fig. 16 is a schematic plan view of the drive element of the scroll compressor of Fig. 15; Fig. 17 is a schematic cross-sectional view of the drive element of the scroll compressor of Fig. 15; Fig. 18 is a schematic perspective view of a retaining ring of the drive element of the scroll compressor of Fig. 15; Fig. 19 is a schematic perspective view of a drive element of a scroll compressor according to an embodiment of the present invention; Fig. 20 is a schematic plan view of the drive element of the scroll compressor of Fig. 19; Fig. 21 is a schematic cross-sectional view of the drive element of the scroll compressor of Fig. 19; Fig. 22 is a schematic cross-sectional view of a drive element of a scroll compressor according to an embodiment of the present invention; Fig. 23 is a schematic perspective view of a retaining ring of the drive element of the scroll compressor of Fig. 22; Fig. 24 is a partially enlarged schematic cross-sectional view of the drive element of the scroll compressor of Fig. 22; Fig. 25 is a schematic plan view of a drive element of a scroll compressor according to a modified example of the Fig. 3 illustrated embodiment; Fig. 26 is a schematic plan view of a drive element of a scroll compressor according to a modified example of the Fig. 7 illustrated embodiment; Fig. 27 is a schematic plan view of a drive element of a scroll compressor according to a modified example of the Fig. 10 illustrated embodiment; Fig. 28 is a schematic plan view of a drive element of a scroll compressor according to a modified example of the Fig. 13 illustrated embodiment; Fig. 29 is a schematic perspective view of a drive element of a scroll compressor according to an embodiment of the present invention; and Fig. 30 is a schematic plan view of the drive element of the Fig. 29 shown scroll compressor. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0032] As in the Fig. 1 and Fig. 1A, a scroll compressor 100 according to an embodiment of the present invention includes a first scroll 11, a second scroll 12, a scroll cover 6, a bracket 4, a motor 7, and a drive element 3. The first scroll 11 includes a first end plate 112 and a first scroll wrap 113 protruding from the first end plate 112. The second scroll 12 includes a second end plate 123 and a second scroll wrap 124 protruding from the second end plate 123. The second scroll wrap 124 and the first scroll wrap 113 together form a compression chamber for compressing the medium. The bracket 4 is arranged on a side of the second scroll 12 facing away from the first scroll 11. The spiral cover 6 is connected to a flange portion 32 of the drive element 3, for example by screws, and to the first spiral 11, for example by screws, whereby the drive element 3 is firmly connected to the first spiral 11.The drive element 3 is rotatably mounted on the holder 4 and is arranged on the side of the second spiral 12 facing away from the first spiral 11. The motor 7 drives the first spiral 11 to rotate via the drive element 3 and the spiral cover 6, with the first spiral 11 driving the second spiral 12 to rotate.

[0033] Referring to the Fig. 1 and Fig. 1A, the scroll compressor 100 in the present embodiment further includes a fixed shaft 5, the lower end of which is fixed to the bracket 4. The drive member 3 is rotatably mounted on the fixed shaft 5 via a hub portion 31, so that the drive member 3 is rotatably mounted to the bracket 4. The second end plate 123 of the second scroll 12 is rotatably supported on the flange portion 32 of the drive member 3.

[0034] As in the Fig. 1 and Fig. As shown in Figure 1A, in embodiments of the present invention, the motor 7 may be an axial flux motor or a radial flux motor. In some embodiments, the motor 7 includes a rotor 71 and a stator 72 mounted on the support 4, with the rotor 71 of the motor 7 rotating the first scroll 11 by driving the drive member 3 to rotate.

[0035] According to the Fig. 2 to 4, 6 to 17, 19 to 22, and 25 to 30, the drive element 3 according to an embodiment of the present invention comprises: a hub portion 31 with an inner bore 30, the hub portion 31 having a first end 311 and a second end 312 which are opposite to each other; and a flange portion 32 which extends outwardly from the first end 311 of the hub portion 31 in the radial direction of the hub portion 31, the flange portion 32 having a surface 321 which faces in a direction from the first end 311 to the second end 312, the surface 321 of the flange portion 32 having an annular thrust surface 3210 and an oil groove.

[0036] According to the Fig. 6 to 17 and Fig. 26 to 30, in one embodiment of the present invention, the oil groove comprises a first oil groove 331 on the annular thrust surface 3210 of the surface 321 of the portion 32. The first oil groove 331 extends laterally in a direction from a radially inner side of the annular thrust surface 3210 to a radially outer side of the annular thrust surface 3210 and extends laterally through a portion of the annular thrust surface 3210. The first oil groove 331 is spaced from a radially outer edge 3211 of the annular thrust surface 3210 in the radial direction of the hub portion 31. The first oil groove 331 may extend in the radial direction or at an acute angle to the radial direction. According to one example of the present invention, the first oil groove 331 extends from a radially inner edge 3212 of the annular thrust surface 3210.The first oil groove 331 can also extend from a different position, for example, at a certain distance from the radial inner edge 3212 of the annular thrust surface 3210 in the radial direction. In the embodiment shown in the figures, the annular thrust surface 3210 extends in the radial direction from an edge 300 of the inner bore 30 of the hub portion 31. For example, the first oil groove 331 extends from the edge 300 of the inner bore 30 of the hub portion 31 toward the radial outer side of the annular thrust surface 3210 and is in communication with the inner bore 30. The annular thrust surface 3210 can also extend from a different position in the radial direction of the hub portion 31, for example, at a certain distance from the edge 300 of the inner bore 30 of the hub portion 31 in the radial direction.In one embodiment of the present invention, the first oil groove 331 may comprise at least one oil groove or two or more oil grooves distributed at a certain interval (e.g., equidistant) in a circumferential direction. By providing a first oil groove on the thrust surface, the first oil groove can receive lubricating oil even when the compressor is running at high speed and supply lubricating oil to a friction pair between the drive element and the second scroll.

[0037] According to the Fig. 9 to 17, 19 to 22 and 27 to 30, the oil groove in one embodiment of the present invention further comprises a second oil groove 332 arranged on the surface 321 of the portion 32 of the flange on the radially outer side of the annular thrust surface 3210 of the surface 321 of the portion 32 of the flange, wherein the second oil groove 332 extends around the annular thrust surface 3210. According to Fig. 9 to 17 and Fig. 27 to 30, in one embodiment of the present invention, the second oil groove 332 is deeper than the first oil groove 331. The second oil groove 332 can hold lubricating oil and prevent the lubricating oil from flowing out of the thrust surface due to centrifugal force in the radial direction directly from the first oil groove.

[0038] According to the Fig. 9 to 11, 15 to 17, 19 to 22, 27, 29 and 30, in one embodiment of the present invention, the second oil groove 332 is a closed annular oil groove. According to the Fig. 15 to 18, 22 and 23, the drive element 3 in one embodiment of the present invention further comprises a retaining ring 35 arranged in the second oil groove 332. As shown in the Fig. 17 and Fig. 18, the retaining ring 35 may have a rectangular or square cross-section and be solid. Fig. In the embodiments shown in Figures 22 to 24, the retaining ring 35 has a C-shaped cross-section and an opening 351 facing a rotational axis of the drive element 3. An outer part of the retaining ring may be a C-shaped section 352 made of wear-resistant material (e.g., Teflon), and an inner part thereof is provided with a spring 353 as a holder. In other words, the Fig. 18 and Fig. 23 shown retaining rings 35 can be inserted into the second oil groove 332 of the Fig. 9 to 11 respectively Fig. 19 to 21. The retaining ring can prevent a portion of the lubricating oil from flowing radially out of the contact area between the drive element and the second scroll.

[0039] As in the Fig. 2 to 4, 6 to 17, 19 to 22 and 25 to 30, the drive element 3 further comprises eccentric ring openings 326 in the surface 321 of the flange portion 32. The drive element 3 may comprise three eccentric ring openings 326. In the Fig. 9 to 11, 15 to 17 and 27, portions of the second oil groove 332 corresponding to the eccentric ring openings 326 are arranged on the inner sides of the eccentric ring openings 326 in the radial direction of the hub portion 31. In the embodiments shown in the Fig. 12 to 14 and Fig. 28, the second oil groove 332 comprises a plurality of second oil groove sections 3320, wherein each of the plurality of second oil groove sections 3320 is arranged between adjacent eccentric annular openings 326 and one end 3321 of each of the plurality of second oil groove sections 3320 is connected to the eccentric annular opening 326. The second oil groove 332 may extend along a circle, and the center of the circle lies on the axis of rotation of the drive element 3. In the embodiments shown in the Fig. 19 to 22 and Fig. 29 to 30, the drive element 3 further comprises an annular second oil groove 332 arranged on the surface 321 of the portion 32 of the flange on the radially outer side of the annular thrust surface 3210 of the surface 321 of the portion 32 of the flange. The second oil groove 332 may extend along a circle, wherein the center of the circle lies on the rotational axis of the drive element 3 and the portions of the second oil groove 332 corresponding to the eccentric annular openings 326 are arranged on the outer sides of the eccentric annular openings 326 in the radial direction of the hub portion 31. In the embodiments shown in the Fig. In the embodiments shown in Figures 19 to 22, the first oil groove 331 was omitted and only the second oil groove was retained.

[0040] According to the Fig. 2, 3, 6, 7, 9, 10, 12, 13, 15, 16, 25 to 30, the drive element 3 in some embodiments of the present invention further comprises an oil drain hole 325 extending through the flange portion 32 and arranged on the radially outer side of the annular thrust surface 3210 on the surface 321 of the flange portion 32. In other embodiments of the present invention (see Fig. 19 and Fig. 20), the drive element 3 further comprises an oil drain hole 325 extending through the flange portion 32 and located at a portion of the annular thrust surface 3210 that lies on its radially outer side. In the embodiment shown in the figures, the drive element 3 comprises three oil drain holes 325. The oil drain holes 325 can be any number of oil drain holes 325. As the lubricating oil flows to the end of the thrust surface, the lubricating oil flows into the oil drain holes and eventually returns to an oil tank at the bottom.

[0041] According to the Fig. 2 to 5 and 25, in some embodiments of the present invention, the drive element 3 further comprises an annular wedge-shaped projection 36 protruding from the annular thrust surface 3210 of the surface 321 of the flange portion 32. The wedge-shaped projection 36 has a wedge-shaped cross-section in the radial direction, and the wedge-shaped projection 36 has a wedge-shaped projection surface 360. In the cross-section in the radial direction, a first wedge-shaped projection location 361 of the wedge-shaped projection surface 360 has the greatest axial distance from the surface 321 of the flange portion 32 in the radial direction, and a second wedge-shaped projection location 362 of the wedge-shaped projection surface 360 has no axial distance from the surface 321 of the flange portion 32 in the radial direction. The first wedge-shaped projection location 361 can be arranged on a radial outer side or a radial inner side of the second wedge-shaped projection location 362.In the embodiment shown in the figures, the second wedge-shaped projection location 362 is arranged on the edge 300 of the inner bore 30 of the hub section 31. The second wedge-shaped projection location 362 can also be located at a certain distance in the radial direction from the edge 300 of the inner bore 30 of the hub section 31. At the first wedge-shaped projection location 361, the axial distance between the wedge-shaped projection surface 360 and the surface 321 of the flange section 32 is in a range of 0.1 micrometers to 1 millimeter. Fig. 2 to 5, the annular thrust surface 3210 of the surface 321 is provided with an annular wedge-shaped projection 36, but without a first oil groove 331 and a second oil groove 332. In the embodiments shown in the Fig. In the embodiments shown in Figures 19 to 24, the annular thrust surface 3210 of the surface 321 is provided with an annular wedge-shaped projection 36 and a second oil groove 332, but without a first oil groove 331. Furthermore, at least one of the three elements—the wedge-shaped projection 36, the first oil groove 331, and the second oil groove 332—may be present on the surface 321. For example, the annular thrust surface 3210 of the surface 321 may be provided with only the first oil groove 331, the surface 321 may be provided with only the second oil groove 332, or only the first oil groove 331 and the second oil groove 332 may be provided. By providing a wedge-shaped projection on the thrust surface, the formation of an oil film between the second scroll and the drive element is promoted.

[0042] According to the Fig. 1, Fig. 2, Fig. 3, Fig. 6, Fig. 7, Fig. 9, Fig. 10, Fig. 12, Fig. 13, Fig. 15, Fig. 16, Fig. 19, Fig. 20 and Fig. 25 to 30, the flange portion 32 of the drive element 3 in these embodiments of the invention has a bore 323 for connection to the drive element, wherein the bore 323 for connection to the drive element of the flange portion 32 of the drive element 3 has a threaded portion, as in Fig. 1. The spiral cover 6 is firmly connected to the flange portion 32 of the drive element 3 via screws and the threaded portion of the bore 323. The spiral cover 6 is also connected to the first spiral 11 by bolts, and thus the drive element 3 is firmly connected to the first spiral 11.

[0043] According to the Fig. 1, 2, 3, 6, 7, 9, 10, 12, 13, 15, 16, 19, 20, 25 to 30, in these embodiments of the invention, the flange portion 32 of the drive element 3 has a drive pin bore 322. The scroll cover 6 has a scroll cover bore, and a pin is inserted into the scroll cover bore and the pin bore 322 of the flange portion 32 of the drive element 3 to fix the relative positions of the scroll cover 6 and the drive element 3, thereby fixing the relative positions of the first scroll 11 and the drive element 3.

[0044] When the compressor is operating, lubricating oil is pumped from the oil tank at the bottom through the inner bore 30 of the hub section 31 to the thrust surface. Centrifugal force causes the lubricating oil to flow from the inside of the thrust surface of the drive element to the outside of the thrust surface. The first oil groove and / or the second oil groove can hold more oil to form an oil film and partially prevent lubricating oil from flowing out of the thrust surface.

[0045] According to embodiments of the present invention, the compressor can partially prevent the flow of lubricating oil from the thrust surface at high speed.

[0046] Although the above embodiments have been described, some features of the above embodiments may be combined to form new embodiments.

[0047] For example, the wedge-shaped projection 36, although it is only used in the Fig. 2 to 5 and Fig. 25 shown embodiments, may be present in any embodiment of the invention.

Claims

[1] Drive element for a scroll compressor, comprising: - a hub portion having an internal bore, the hub portion having a first end and a second end opposite each other; and - a flange portion extending outwardly from the first end of the hub portion in a radial direction of the hub portion, the flange portion having a surface facing in a direction from the first end to the second end, the surface of the flange portion having an annular thrust surface and an oil groove. [2] The drive element according to claim 1, wherein the oil groove comprises a first oil groove on the annular thrust surface of the surface of the flange portion, the first oil groove extends laterally in a direction from a radially inner side of the annular thrust surface to a radially outer side of the annular thrust surface and extends laterally through a portion of the annular thrust surface, and the first oil groove is spaced from a radially outer edge of the annular thrust surface in the radial direction of the hub portion. [3] The drive element according to claim 2, wherein the first oil groove extends in the radial direction. [4] A drive element according to claim 2, wherein the first oil groove extends from a radially inner edge of the annular thrust surface. [5] Drive element according to claim 2, wherein the annular thrust surface extends from an edge of the inner bore of the hub portion in the radial direction of the hub portion. [6] A drive element according to claim 5, wherein the first oil groove extends from the edge of the inner bore of the hub portion toward the radially outer side of the annular thrust surface and communicates with the inner bore. [7] The drive element according to claim 1, wherein the oil groove further comprises a second oil groove disposed on the surface of the portion of the flange at a radially outer side of the annular thrust surface of the surface of the portion of the flange, the second oil groove extending around the annular thrust surface. [8] The drive element according to claim 2, wherein the oil groove further comprises a second oil groove disposed on the surface of the portion of the flange on the radially outer side of the annular thrust surface of the surface of the portion of the flange, the second oil groove extending around the annular thrust surface. [9] The drive element according to claim 8, wherein the depth of the second oil groove is greater than the depth of the first oil groove. [10] The drive element according to claim 7 or 8, wherein the second oil groove is a closed annular oil groove. [11] The drive element according to claim 10, further comprising a retaining ring disposed in the second oil groove. [12] The drive element according to claim 11, wherein the retaining ring has a rectangular cross-section. [13] Drive element according to claim 11, wherein the retaining ring has a C-shaped cross-section and an opening facing an axis of rotation of the drive element. [14] A drive element according to claim 7 or 8, further comprising an eccentric ring opening in the surface of the flange portion, wherein portions of the second oil groove corresponding to the eccentric ring opening are arranged on inner sides of the eccentric ring opening in the radial direction of the hub portion. [15] A drive element according to claim 7 or 8, further comprising eccentric annular openings in the surface of the flange portion, wherein the second oil groove has a plurality of second oil groove portions, each of the plurality of second oil groove portions is arranged between adjacent eccentric annular openings, and one end of each of the plurality of second oil groove portions communicates with an eccentric annular opening. [16] The drive element according to claim 15, wherein the second oil groove extends along a circle and a center of the circle lies on a rotational axis of the drive element. [17] Drive element according to claim 2, further comprising an oil drain bore extending through the portion of the flange and disposed on the radially outer side of the annular thrust surface of the surface of the flange portion. [18] The drive element according to any one of claims 1 to 9, further comprising an annular wedge-shaped projection protruding from the annular thrust surface of the surface of the flange portion, wherein a cross section of the wedge-shaped projection in a radial direction has a wedge-shaped shape and the wedge-shaped projection has a wedge-shaped projection surface facing axially outward, wherein in the cross section in the radial direction, a first wedge-shaped projection location of the wedge-shaped projection surface has a greatest axial distance from the surface of the flange portion in the radial direction and a second wedge-shaped projection location has no axial distance from the surface of the flange portion in the radial direction. [19] Drive element according to claim 18, wherein the first wedge-shaped projection location is arranged on a radially outer side of the second wedge-shaped projection location. [20] The drive element according to claim 19, wherein the second wedge-shaped projection location is arranged at an edge of the inner bore of the hub portion. [21] The drive element according to claim 18, wherein at the first wedge-shaped projection location, an axial distance between the wedge-shaped projection surface and the surface of the flange portion is in a range of 0.1 micrometer to 1 millimeter. [22] Scroll compressor comprising the drive element according to one of claims 1 to 21. [23] A scroll compressor having a first scroll which: - a first end plate and a first turn of the spiral projecting downwardly from the first end plate; - a second spiral having a second end plate and - a second spiral coil projecting upwardly from the second end plate, the second spiral and the first spiral cooperating to form a compression chamber for compressing refrigerant; - an engine; - the drive element according to claim 1, wherein the drive element is arranged below the second spiral, the motor drives the first spiral to rotate by means of the drive element, the first spiral drives the second spiral to rotate, and the second end plate of the second spiral is rotatably supported on the flange portion of the drive element; and - a holder, wherein the drive element is rotatably mounted on the holder. [24] A scroll compressor according to claim 23, further comprising a scroll cover having an end plate with a central bore and a cylindrical portion extending downwardly from an outer periphery of the end plate, the cylindrical portion of the scroll cover being connected to the flange portion of the drive member, and the end plate of the scroll cover being connected to the first end plate of the first scroll. [25] A scroll compressor according to claim 23, further comprising a fixed shaft, a lower end of the fixed shaft being fixed to the bracket, and the hub portion of the drive member being rotatably mounted on the fixed shaft. [26] A scroll compressor according to claim 23, wherein the inner bore of the drive member has a stepped portion or a concave-convex connecting portion.

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