JP2009133329A - Bearing member and compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the nonuniform contact of a rotating shaft from occurring while reducing the friction occurring on the rotating shaft by the rotation. <P>SOLUTION: This member 71 for a bearing is a cylindrical member which is secured to a holding member 14 other than itself and which supports the rotating shaft 13 by the inner peripheral surface 71b thereof. The portion of the member 71 near an opening end 711 is lower in rigidity than the other portions. Specifically, a groove 71a extending along the extending direction (direction 91) of the rotating shaft 13 is formed in the portion of the member 71 near the opening end 711. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing member, and more particularly to friction with a rotating shaft and per-rotation shaft contact.

  The compressor includes a rotating shaft, a drive unit, and a compression mechanism. The rotating shaft is slidably supported by a housing provided in the compressor. The drive unit is, for example, a motor and can rotate the rotation shaft.

  The compression mechanism is a mechanism for compressing the refrigerant, and includes a fixed portion and a movable portion that mesh with each other. The movable part is eccentric from the center of the rotating shaft and is slidably supported by the rotating shaft. And a movable part revolves around the center of a rotating shaft because a rotating shaft rotates. Thereby, the refrigerant in the space formed by the fixed portion and the movable portion is compressed.

  However, since the movable part is eccentric from the center of the rotation axis, centrifugal force is applied to the movable part during rotation, and the rotation axis swings. For this reason, the rotating shaft rotates in a state where a part of the side surface of the rotating shaft is in contact with the housing (hereinafter referred to as a “single piece state”), so that both the rotating shaft and the housing are worn and eventually compressed. There is a risk of machine failure.

  Therefore, conventionally, a technique has been proposed in which an annular slit is provided in a portion of a housing that supports a rotating shaft. According to such a technique, providing the slit in the housing reduces the rigidity of the portion where the slit is provided. Therefore, when the rotating shaft is swung around, the portion whose rigidity has been lowered is pushed by the rotating shaft and deformed, and the contact of the rotating shaft with the housing is alleviated. Such a technique is disclosed in, for example, Patent Document 1 listed below.

Further, the technique of Patent Document 2 listed below has also been proposed. That is, between the housing and the rotating shaft, a member that can swing itself according to the swinging motion of the rotating shaft is provided. Specifically, the member protrudes toward the housing near the center in the extending direction of the rotating shaft, and only the protruding portion is in contact with the housing. This prevents the rotating shaft and the housing from being worn.
JP 2003-97458 A JP-A-8-31542

  However, in the technique of Patent Document 1, since the rotating shaft is directly supported by the housing, it is difficult to reduce the friction generated between the housing and the rotating shaft. For example, it is conceivable to supply the lubricant to the sliding surface between the housing and the rotating shaft, but the time for which the supplied lubricant stays on the sliding surface is short. For this reason, a mechanism for continuing to supply the lubricant is required, and a mechanism for processing the lubricant that has flowed out from the sliding surface is also required, which complicates the structure.

  Further, in the technique of Patent Document 2, it is difficult to obtain the effect of preventing the rotating shaft and the housing from being worn as compared with the technique of Patent Document 1.

  The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to prevent the rotation shaft from hitting one side while reducing friction generated on the rotation shaft by rotation.

  The bearing member according to the first aspect of the invention is a cylindrical member that is fixed to a holding member different from itself and supports the rotating shaft by its own inner peripheral surface. And the portion near the opening end of the bearing member has lower rigidity than the other portions.

  The bearing member according to the second invention is the bearing member according to the first invention, and a groove extending along the extending direction of the rotating shaft is provided in a portion near the opening end.

  A bearing member according to a third aspect is the bearing member according to the first aspect, wherein a notch is provided in a portion near the opening end.

  A bearing member according to a fourth invention is a bearing member according to any one of the first to third inventions, is a sintered base, and an inner peripheral surface is coated with a resin.

  A bearing member according to a fifth aspect is the bearing member according to any one of the first to third aspects, and is formed of a porous material.

  A compressor according to a sixth invention is a bearing member according to any one of the first to fourth inventions, a rotating shaft supported by the bearing member, and a holding member to which the bearing member is fixed. Is provided.

  According to the bearing member according to the first aspect of the present invention, the rigidity in the vicinity of the opening end is low, so that it is more easily deformed than the other parts. Therefore, when the rotating shaft swings, a portion with low rigidity (portion near the opening end) is pushed and deformed by the rotating shaft, so that the contact of the rotating shaft with the bearing member is alleviated. Moreover, since the bearing member is a separate member from the holding member, it is easy to process the bearing member to reduce the rigidity.

  Furthermore, since the bearing member is a separate member from the holding member, for example, by using a material that can be impregnated with a lubricant for the bearing member, friction generated between the bearing member and the rotating shaft is reduced. However, the effect (lubrication effect) can be maintained. Further, when the bearing member is a member different from the holding member, the bearing member is easily subjected to processing for enhancing the lubricating effect.

  According to the bearing member according to the second or third invention, the rigidity of the portion in the vicinity of the opening end can be reduced.

  According to the bearing member according to the fourth or fifth invention, the lubricating effect can be maintained.

  According to the compressor of the sixth aspect of the invention, it is possible to alleviate the contact of the rotating shaft with the bearing member while maintaining the lubrication effect.

1. 1 is a cross-sectional view conceptually showing a scroll compressor 1 according to an embodiment of the present invention. Note that FIG. 1 shows a direction 91, and in the following, the tip side of the arrow in the direction 91 is referred to as “upper side” and the opposite side is referred to as “lower side”.

  The scroll compressor 1 includes a housing 11, a motor 12, a rotating shaft 13, a holding member 14, a bearing member 71, and a compression mechanism 16. Hereinafter, each component will be described in detail.

<Case 11>
The casing 11 has a cylindrical shape with the upper end closed, and extends along the direction 91. A motor 12, a rotating shaft 13, a holding member 14, a bearing member 71, and a compression mechanism 16 are accommodated in the housing 11.

<Motor 12>
The motor 12 includes a stator 51 and a rotor 52. The stator 51 is annular and is fixed to the inner wall 11 a of the housing 11. The rotor 52 is provided on the inner peripheral side of the stator 51 and faces the stator 51 via an air gap.

  The rotor 52 can rotate about the shaft 90 and rotates by a magnetic action from the stator 51. In FIG. 1, the direction along the axis 90 coincides with the direction 91.

<Rotating shaft 13>
The rotating shaft 13 extends along the direction 91 and has a main shaft 13a and an eccentric portion 13b. The rotating shaft 13 can rotate around the shaft 90.

  The center of the main shaft 13 a coincides with the shaft 90 and is connected to the rotor 52. The center of the eccentric portion 13b is offset from the shaft 90, and is connected to the upper side of the main shaft 13a.

<Holding member 14>
The holding member 14 is specifically a housing in FIG. 1 and is fitted to the inner wall 11 a of the housing 11. For example, the holding member 14 is fitted to the inner wall 11a by a method such as press fitting or shrink fitting.

  The holding member 14 is provided with a recess 31 opened upward and a hole 33 penetrating from the recess 31 downward. The eccentric portion 13 b of the rotating shaft 13 is accommodated in the recess 31.

<Bearing member 71>
The bearing member 71 will be described in detail in “2. Bearing member” described later.

<Compression mechanism 16>
The compression mechanism 16 includes a fixed scroll 24 and a movable scroll 26 and compresses the refrigerant. As the refrigerant, for example, a mixed refrigerant containing hydrofluorocarbon (HFC) or a refrigerant containing carbon dioxide as a main component can be adopted.

  The fixed scroll 24 includes an end plate 24a and a compression member 24b. The end plate 24a is fixed to the inner wall 11a of the housing 11, and the compression member 24b is connected to the lower side of the end plate 24a. The compression member 24b extends in a spiral shape, and a groove 24c is formed between the spiral members.

  The movable scroll 26 includes an end plate 26a, a compression member 26b, and a bearing 26c. The compression member 26b is connected to the upper side of the end plate 26a and extends in a spiral shape.

  The compression member 26 b fits in the groove 24 c of the fixed scroll 24. In the compression mechanism 16, the space 40 between the compression member 24b and the compression member 26b is used as a compression chamber by being sealed with the end plates 24a and 26a.

  The bearing 26c is connected to the lower side of the end plate 26a and slidably supports the eccentric portion 13b of the rotating shaft 13. The movable scroll 26 revolves around the shaft 90 as the eccentric portion 13 b rotates around the shaft 90.

2. Bearing member The bearing member 71 is a member different from the holding member 14, and for example, a sintered base material or the like is used. The bearing member 71 has a cylindrical shape, is fixed to the inner peripheral side of the hole 33 of the holding member 14, and supports the rotary shaft 17 by its own inner peripheral surface 71 b. That is, the bearing member 71 functions as a bearing that slidably supports the rotating shaft 17.

  By making the bearing member 71 a member different from the holding member 14, it becomes easy to perform processing (FIGS. 2 and 3) on the bearing member 71 for lowering the rigidity described later.

  The inner peripheral surface 71b of the bearing member 71 is coated with resin. Therefore, the effect (lubricating effect) can be maintained while reducing the friction generated between the bearing member 71 and the rotary shaft 13.

  Moreover, since the bearing member 71 is a separate member from the holding member 14, the bearing member 71 can be easily coated with resin. In other words, the bearing member 71 is easily subjected to processing for enhancing the lubricating effect.

  2 and 3 are a sectional view and a top view, respectively, conceptually showing the shape of the bearing member 71. A groove 71a extending along the extending direction (direction 91) of the rotary shaft 13 is provided in the vicinity of the upper opening end 711 of the bearing member 71 (FIG. 2). And the groove | channel 71a is extended along the circumferential direction 92 around the rotating shaft 13, and the shape of the groove | channel 71a seen from the top is one continuous ring (FIG. 3).

  According to the shape of the bearing member 71, the portion in the vicinity of the opening end 711 is less rigid than the other portions and easily deforms. Therefore, when the rotating shaft 13 is swung around, the portion in the vicinity of the opening end 711 is pushed and deformed by the rotating shaft 13, and the contact of the rotating shaft 13 with the bearing member 71 is alleviated. Specifically, it is as follows.

  For example, as in the case of the bearing member 79 shown in FIG. 4, when a notch 79 a is provided in advance on the inner peripheral side of the portion in the vicinity of the opening end 791 in order to prevent one-side contact, It is difficult to make the angle θ1 of the notch 79a coincide with the angle θ2 at which 13 is inclined from the axis 90. FIG. 4 shows the case where the angle θ1 is larger than the angle θ2, but in this case, a gap is formed between the rotary shaft 13 and the inner peripheral surface 71b in the inclined direction, and the rotary shaft 13 There is a risk of encouraging whirling.

  However, according to the bearing member 71 described above, as shown in FIG. 5, the portion in the vicinity of the opening end 711 is deformed according to the angle θ <b> 2 of the rotating shaft 13 when swinging. And since the groove | channel 71a is closed with the deformation | transformation of the part of the opening end 711 vicinity, the rigidity of the part increases. Therefore, it is difficult to form a gap between the rotary shaft 13 and the inner peripheral surface 71b in the direction in which the rotary shaft 13 is inclined, and therefore, the swinging of the rotary shaft 13 is hardly promoted.

<Modification 1>
In the bearing member 71 shown in FIG. 3, the shape of the groove 71 a when viewed from above is a single continuous ring, but the bearing member 72 shown in FIG. 6 is replaced with the bearing member 71. It may be adopted.

  FIG. 6 is a top view conceptually showing the bearing member 72. A plurality of holes 72 a extending along the extending direction (direction 91) of the rotating shaft 13 are provided in the vicinity of the opening end 721 on the upper side of the bearing member 72. The plurality of holes 72a are annularly arranged around the rotation shaft 13 in a state of being separated from each other. The hole 72a can be grasped as a groove provided in the bearing member 72.

  According to the bearing member 72 shown in FIG. 6, as in the bearing member 71, the rigidity of the portion in the vicinity of the opening end 721 is reduced, so that the contact between the rotating shaft 13 and the bearing member 72 can be reduced. Can do. In addition, since it is only necessary to provide the hole 72a in the bearing member 72, the processing to the bearing member 72 is easy.

  In FIG. 6, the shape of the hole 72a when viewed from above is round, but the shape is not limited to this and may be other shapes. For example, as shown in FIG. 7, a plurality of holes 72 a extending by a predetermined length along the circumferential direction 92 may be provided.

<Modification 2>
Instead of the bearing member 71, a bearing member 73 shown in FIGS. 8 and 9 may be employed. 8 and 9 are sectional views conceptually showing the bearing member 73. A notch 73 a is provided on the outer peripheral side of the portion near the opening end 731 of the bearing member 73.

  Specifically, in FIG. 8, a notch 73 a is provided without leaving the end face of the opening end 731. In FIG. 9, a notch 73 a is provided leaving a part of the end face of the opening end 731.

  According to the bearing member 73 shown in FIGS. 8 and 9, the rigidity of the portion in the vicinity of the opening end 731 is reduced similarly to the bearing member 71, so that the rotation shaft 13 is prevented from contacting the bearing member 73. Can be relaxed. Moreover, the notch 73a is easier to process into the bearing member than the grooves 71a and 72a.

  The shape of the bearing member is not limited to any of the shapes shown in FIGS. 3 and 6 to 9, and the rigidity of the portion near the opening end of the bearing member is the rigidity of the other portion. Any other shape may be used as long as the shape is lower than that.

  Moreover, it is preferable to shape | mold the bearing member which exhibits the shape shown by FIG.3 and FIGS.6-9, and another shape, for example using a metal mold | die. This is because, after forming the bearing member, processing for reducing the rigidity of the portion near the opening end is not necessary.

<Modification 3>
Instead of the bearing member 71, a bearing member 74 shown in FIG. 10 may be employed. FIG. 10 is a sectional view conceptually showing the bearing member 74. A material 74 having a lower rigidity than the other portions is used for the portion 74 a in the vicinity of the opening end 741 of the bearing member 74. For example, a material having a Young's modulus lower than that used for the other portions is used for the portion 74a.

  Also with the bearing member 74 shown in FIG. 10, the rigidity of the portion in the vicinity of the opening end 731 is reduced, so that the contact of the rotating shaft 13 with the bearing member 74 can be reduced. In addition, since it is not necessary to provide the grooves 71a, 72a, the notches 73a, etc., the manufacture of the bearing member 74 is simplified.

<Modification 4>
The bearing member 71 described above is a sintered base material, and the inner peripheral surface 71b is coated with resin. However, the bearing member 71 may be formed of, for example, a porous material.

  According to the bearing member 71 according to the present modification, the bearing member 71 can be impregnated with the lubricant. For this reason, a lubricant can be supplied between the bearing member 71 and the rotary shaft 13, and thus friction generated between the bearing member 71 and the rotary shaft 13 can be reduced. In addition, since the lubricant is impregnated in the bearing member 71, leakage of the lubricant can be prevented, and the lubricating effect can be maintained.

3. Application to other compressors The above-described technique can also be applied to other compressors such as a rotary compressor. Also in this case, as described above, the bearing members 71 to 74 can alleviate the contact of the rotating shaft 13 with the bearing members 71 to 74 while maintaining the lubricating effect.

It is sectional drawing which shows notionally the scroll compressor concerning embodiment of this invention. It is sectional drawing which shows notionally the shape of the member for bearings. It is a top view which shows notionally the shape of the member for bearings. It is a figure which shows notionally the shape of the member 79 for bearings. It is a figure which shows notionally the shape of the member 71 for bearings after deform | transforming. It is a top view which shows notionally the modification 1 of the member for bearings. It is a top view which shows notionally the modification 1 of the member for bearings. It is sectional drawing which shows the modified example 2 of the member for bearings notionally. It is sectional drawing which shows the modified example 2 of the member for bearings notionally. It is sectional drawing which shows notionally the modification 3 of the member for bearings.

Explanation of symbols

13 Rotating shaft 14 Holding member 71-74 Bearing member 71a, 72a Groove (hole)
71b Inner peripheral surface 73a Notch 711-1141 Open end

Claims (6)

A cylindrical member (71; 72; 73; 74) fixed to a holding member (14) different from itself and supporting the rotating shaft (13) by its inner peripheral surface (71b),
The member for bearings in which the part near the opening end (711; 721; 731; 741) of the said cylindrical member has rigidity lower than another part.   The bearing member according to claim 1, wherein a groove (71a; 72a) extending along an extending direction of the rotating shaft (13) is provided in the portion in the vicinity of the opening end (711; 721). .   The bearing member according to claim 1, wherein a notch (73 a) is provided in the portion near the opening end (731).   The bearing member according to any one of claims 1 to 3, wherein the bearing member is a sintered base material, and an inner peripheral surface (71b) is coated with a resin.   The bearing member according to any one of claims 1 to 3, wherein the bearing member is formed of a porous material. The bearing member (71-74) according to any one of claims 1 to 5,
A rotating shaft (13) supported by the bearing member;
And a holding member (14) to which the bearing member is fixed.

Images