JP2010174826A - Scroll type fluid machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the assembling work of a fixed scroll, a rotary scroll, and an auxiliary crank mechanism. <P>SOLUTION: A bolt 27 is fastened to a female screw 44 of a fixed side shaft 38 via a washer 38 for fixing a fixed side ball bearing to the fixed side shaft 38 of an auxiliary crank 37 while applying a preload to the fixed side ball bearing. As a recessed part 46 formed in the fixed side shaft 38 is engaged with a projected part 47 formed in the washer 28, by fastening the bolt 27 while pressing the washer 28 using a tool such as a wrench, a fastening force by fastening the bolt 27 is prevented from being applied to the rotary scroll or the base end of a rotary side bearing 39 of the auxiliary crank 37. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a scroll fluid machine suitable for use in, for example, a compressor, a vacuum pump, an expander, and the like.

  Generally, a scroll type fluid machine has a casing, a drive shaft that is rotatably provided in the casing, a crank portion that is formed on the front end side of the drive shaft and is eccentric with respect to the drive shaft, and a fixed that is fixed to the casing. A scroll and a turning scroll connected to the crank portion of the drive shaft and turning with respect to the fixed scroll are provided. In such a scroll type fluid machine, the drive shaft is rotated by a drive source such as a motor, and the orbiting scroll is orbited with respect to the fixed scroll. Thereby, the fluid in the space formed between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll is compressed or expanded.

  Furthermore, the scroll type fluid machine includes an auxiliary crank mechanism. For example, as described in Patent Document 1, the auxiliary crank mechanism supports a turning-side shaft portion provided on one end side of the auxiliary crank on the turning scroll side via a turning-side ball bearing. The fixed-side shaft provided on the other end side is supported on the fixed scroll side via a fixed-side ball bearing, thereby preventing the turning of the orbiting scroll relative to the fixed scroll while allowing the orbiting scroll to rotate relative to the fixed scroll. To do.

JP-A-11-101185

  By the way, in the manufacture of the scroll type fluid machine, the turning side shaft portion of the auxiliary crank is inserted into the turning side ball bearing previously attached to the turning scroll, and the fixed side of the auxiliary crank is fixed to the fixed side ball bearing previously attached to the fixed scroll. The shaft portion is inserted, and the orbiting scroll and the fixed scroll are overlapped while being positioned. After that, a washer is inserted from the axially outer side of the distal end portion of the stationary side shaft portion into the distal end portion of the stationary side shaft portion of the auxiliary crank, and a mounting member such as a bolt is screwed to the distal end portion of the stationary side shaft portion. By doing so, a preload is applied to the fixed-side ball bearing. That is, as described in Patent Document 1, a female screw is formed in the fixed-side shaft portion from the distal end surface of the fixed-side shaft portion in the axial direction of the fixed-side shaft portion, and this female screw is inserted after the washer is inserted. By tightening the mounting member, the inner ring of the fixed side ball bearing is pressed in the axial direction, and a preload is applied to the fixed side ball bearing.

  When manufacturing such a conventional scroll type fluid machine, when the mounting member is fastened to the tip of the fixed side shaft portion of the auxiliary crank, the orbiting scroll is fixed using a jig or the like, and the fastening force of the mounting member is used. This prevents the orbiting scroll from moving. For this reason, there is a problem that the manufacturing process of the scroll type fluid machine increases or the assembly work of the scroll type fluid machine becomes complicated.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is to provide a scroll fluid machine that can simplify assembly work such as a fixed scroll, a turning scroll, and an auxiliary crank mechanism. There is to do.

  The scroll fluid machine according to the present invention includes an engaging portion that engages the fixed-side shaft portion and the washer with each other when the mounting member is fastened to the female screw of the fixed-side shaft portion of the auxiliary crank. To do.

  According to the present invention, assembly work such as a fixed scroll, a turning scroll, and an auxiliary crank mechanism can be simplified.

It is a longitudinal section showing a scroll type air compressor which is a 1st embodiment of the present invention. It is a longitudinal cross-sectional view which expands and shows the auxiliary | assistant crank mechanism of the scroll type air compressor in FIG. FIG. 3 is a partially broken side view showing an auxiliary crank, a bolt and a washer in the auxiliary crank mechanism in FIG. 2 in an exploded state. It is the top view which looked at the fixed side axial part of the auxiliary | assistant crank in FIG. 3 from the arrow IV-IV direction in FIG. It is the top view which looked at the washer in FIG. 3 from the arrow VV direction in FIG. It is a partially broken side view shown in the state which decomposed | disassembled the auxiliary | assistant crank, the volt | bolt, and the washer of the auxiliary | assistant crank mechanism in the scroll type air compressor which is the 2nd Embodiment of this invention. It is the top view which looked at the fixed side axial part of the auxiliary | assistant crank in FIG. 6 from the arrow VII-VII direction in FIG. It is the top view which looked at the washer in FIG. 6 from the arrow VIII-VIII direction in FIG. FIG. 4 is a partially cutaway side view showing a modification of the auxiliary crank and washer in FIG. 3 and a tool for holding the washer. It is the top view which looked at the washer in FIG. 9 from the arrow XX direction in FIG. It is the top view which looked at the tool in FIG. 9 from the arrow XI-XI direction in FIG. FIG. 7 is a partially broken side view showing a modified example of the auxiliary crank and washer in FIG. 6 and a tool for holding the washer. It is the top view which looked at the washer in FIG. 12 from the arrow XIII-XIII direction in FIG. It is the top view which looked at the tool in FIG. 12 from the arrow XIV-XIV direction in FIG. It is a partially broken side view which shows the other modification of the auxiliary | assistant crank and washer in FIG. 6, the tool for pressing this washer, etc. FIG. It is the top view which looked at the washer in FIG. 15 from the arrow XVI-XVI direction in FIG. It is the top view which looked at the tool in FIG. 15 from the arrow XVII-XVII direction in FIG. It is a longitudinal cross-sectional view which shows the auxiliary | assistant crank mechanism of the scroll type air compressor which is the 3rd Embodiment of this invention.

  An oil-free scroll air compressor will be described as an example of a scroll fluid machine according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings.

  First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a scroll type air compressor according to a first embodiment of the present invention. In the scroll air compressor 1 shown in FIG. 1, the casing 2 forms an outer frame of the scroll air compressor 1. The casing 2 is a stepped cylindrical body that is substantially closed on one side in the axial direction and opened on the other side. The casing 2 includes a large-diameter cylindrical portion 2A, and a small-diameter bearing cylindrical portion 2B that is formed in a cylindrical shape having a smaller diameter than the large-diameter cylindrical portion 2A and protrudes outward from one axial side of the large-diameter cylindrical portion 2A. And an annular portion 2C formed between the bearing tube portion 2B and the large diameter tube portion 2A.

  Further, on the outer peripheral side of the casing 2, for example, three bearing housing portions 3 (only one is shown) are provided spaced apart in the circumferential direction. The bearing accommodating portion 3 is formed by a stepped circular hole, and a fixed side ball bearing 21 of an auxiliary crank mechanism 20 described later is accommodated therein.

  The drive shaft 4 is rotatably provided in the bearing tube portion 2B of the casing 2 via bearings 5 and 6. The drive shaft 4 has a crank portion 4A. The crank portion 4 </ b> A is formed on the front end side of the drive shaft 4 located on the other side of the casing 2, and is eccentric with a predetermined eccentricity ε with respect to the axis OO of the drive shaft 4. On the other hand, the front end side of the drive shaft 4 located on one side of the casing 2 protrudes to the outside of the casing 2, and a pulley 7 is attached to the protruding portion. The pulley 7 is connected to a motor for rotating the drive shaft 4 via a belt (both not shown). A main balance weight 8 is attached to the crank portion 4 </ b> A, and a sub balance weight 9 is attached to the inside of the pulley 7.

  The fixed scroll 10 is provided on the other side of the casing 2 and is fixed to the open end of the large-diameter cylindrical portion 2A so as to close the large-diameter cylindrical portion 2A of the casing 2 from the other axial side. The fixed scroll 10 includes a plate body 10A formed in a substantially disc shape with the axis OO as the center, a spiral wrap portion 10B erected in the axial direction on the surface of the plate body 10A, and a wrap portion. The cylinder portion 10 </ b> C that surrounds 10 </ b> B and is provided on the outer peripheral side of the plate body 10 </ b> A and a plurality of cooling fins 10 </ b> D that protrude from the back surface of the plate body 10 </ b> A are roughly configured. Further, for example, two suction ports 11 through which air flows into the compression chamber 17 through the suction filter 11 </ b> A are formed on the outer peripheral side of the fixed scroll 10, and the compression in the compression chamber 17 is formed at the center of the fixed scroll 10. A discharge port 12 for discharging air to the outside through the discharge pipe 12A is formed.

  The orbiting scroll 13 is opposed to the fixed scroll 10 and is provided in the large diameter cylindrical portion 2A of the casing 2 so as to be orbitable. The orbiting scroll 13 includes a substantially disc-like plate body 13A disposed to face the plate body 10A of the fixed scroll 10, a spiral wrap portion 13B standing on the surface of the plate body 13A, and a plate body 13A. The plurality of cooling fins 13 </ b> C projecting from the back surface of the cooling fin 13 </ b> C and a back plate 13 </ b> D fixed at the front end side of the cooling fin 13 </ b> C.

  Further, a bottomed cylindrical boss portion 15 is integrally formed on the center side of the back plate 13D so as to be rotatably connected to the crank portion 4A of the drive shaft 4 via a bearing 14. Further, for example, three bearing housing portions 16 (only one is shown) are provided on the outer peripheral side of the back plate 13D so as to be separated in the circumferential direction. The bearing accommodating part 16 is arrange | positioned in the position corresponding to the bearing accommodating part 3 provided in the casing 2, respectively. Each bearing accommodating portion 16 is formed by a circular hole with a bottom, and a turning-side ball bearing 31 of the auxiliary crank mechanism 20 described later is accommodated therein. Further, a plurality of compression chambers 17 are formed between the orbiting scroll 13 and the fixed scroll 10.

  In addition, the scroll type air compressor 1 is provided with a plurality of, for example, three auxiliary crank mechanisms 20 for preventing the rotation of the orbiting scroll 13 relative to the fixed scroll 10 or the casing 2. These auxiliary crank mechanisms 20 are spaced apart in the circumferential direction between the annular portion 2 </ b> C of the casing 2 and the orbiting scroll 13.

  FIG. 2 shows the auxiliary crank mechanism 20 in FIG. 1 in an enlarged manner. FIG. 2 shows the configuration of one auxiliary crank mechanism 20 among the plurality of auxiliary crank mechanisms 20 included in the scroll air compressor 1, but the configuration of the other auxiliary crank mechanisms is the same as this. It is.

  In the auxiliary crank mechanism 20 shown in FIG. 2, the fixed-side ball bearing 21 is provided on the fixed scroll 10 side or the casing 2 side, and specifically, is accommodated in the bearing accommodating portion 3 of the casing 2. The fixed-side ball bearing 21 is a rear combination angular ball bearing, and an angular ball bearing 22 positioned on the bottom side of the bearing housing 3 and an angular ball bearing 23 positioned on the opening side of the bearing housing 3 are back-to-back. It is comprised by doing.

  The angular ball bearing 22 is configured by an outer ring 22A positioned on the radially outer side, an inner ring 22B positioned on the radially inner side, and a rolling element 22C that is a steel ball disposed between the outer ring 22A and the inner ring 22B. Has been. Similarly to the angular ball bearing 22, the angular ball bearing 23 also includes an outer ring 23A, an inner ring 23B, and a rolling element 23C.

  The outer rings 22A and 23A are provided in the bearing housing portion 3 of the casing 2 so as not to be displaceable in the radial direction and the axial direction. Specifically, the outer rings 22 </ b> A and 23 </ b> A are press-fitted into the bearing housing portion 3, and the outer circumferential surfaces of the outer rings 22 </ b> A and 23 </ b> A are pressed against the inner circumferential surface of the bearing housing portion 3. As a result, the outer rings 22A and 23A cannot be displaced in the radial direction. Further, the outer rings 22A and 23A are pressed between the pressing plate 25 and the annular step portion 3A of the bearing housing portion 3 by fastening the bolt 24 and attaching the pressing plate 25 to the casing 2. As a result, the outer rings 22A and 23A cannot be displaced in the axial direction.

  The retainer plate 25 is provided with an annular seal member 26 for preventing the lubricating oil filled between the outer rings 22A and 23A and the inner rings 22B and 23B of the fixed side ball bearing 21 from leaking. ing.

  The inner rings 22 </ b> B and 23 </ b> B are fixed between the flange portion 40 of the auxiliary crank 37 and the bolt 27 by screwing the bolt 27 to the female screw 44 of the fixed side shaft portion 38 of the auxiliary crank 37. A washer 28 is provided between the fixed side shaft portion 38 and the bolt 27. By tightening the bolt 27, a preload is applied to the inner rings 22B and 23B. As a result, the bearing gap between the outer rings 22A, 23A and the rolling elements 22C, 23C and the bearing gap between the inner rings 22B, 23B and the rolling elements 22C, 23C are all small.

  Further, a convex portion 47 is formed on the contact surface 28 </ b> A of the washer 28, and a tool mounting portion 48 is formed on the outer peripheral side of the washer 28. The convex portion 47 and the tool mounting portion 48 will be described later.

  On the other hand, the orbiting side ball bearing 31 is provided on the orbiting scroll 13 side, and is specifically accommodated in the bearing accommodating portion 16 of the back plate 13D. The turning-side ball bearing 31 is a front combination angular ball bearing, and is configured by front-facing an angular ball bearing 32 located on the bottom side of the bearing housing 16 and an angular ball bearing 33 located on the opening side. ing.

  The angular ball bearing 32 includes an outer ring 32A, an inner ring 32B, and a plurality of rolling elements 32C, and the angular ball bearing 33 includes an outer ring 33A, an inner ring 33B, and a plurality of rolling elements 33C. The outer rings 32A and 33A are provided in the bearing housing portion 16 of the orbiting scroll 13 so as not to be displaceable in the radial direction and the axial direction. Specifically, the outer rings 32 </ b> A and 33 </ b> A are pressed between the presser plate 35 and the bottom surface of the bearing accommodating portion 16 by fastening the bolts 34 and attaching the presser plate 35 to the orbiting scroll 13. Further, by pretightening the bolt 34, a preload is applied to the outer rings 32A and 33A. As a result, the bearing gap between the outer rings 32A, 33A and the rolling elements 32C, 33C and the bearing gap between the inner rings 32B, 33B and the rolling elements 32C, 33C are all small.

  The retainer plate 35 is provided with an annular seal member 36 for preventing the lubricating oil filled between the outer rings 32A and 33A and the inner rings 32B and 33B of the turning ball bearing 31 from leaking. ing.

  The auxiliary crank 37 is supported by the fixed side ball bearing 21 and the turning side ball bearing 31. The auxiliary crank 37 is inserted into the inner rings 22 </ b> B and 23 </ b> B of the fixed side ball bearing 21, and is inserted into the fixed side shaft portion 38 rotatably supported by the fixed side ball bearing 21 and the inner rings 32 </ b> B and 33 </ b> B of the turning side ball bearing 31. The pivot side shaft portion 39 supported by the pivot side ball bearing 31, the flange portion 40 formed in a hook shape on the base end side of the fixed side shaft portion 38, and the base end side of the swing side shaft portion 39 It is comprised by the flange part 41 formed in the shape, and the connection part 42 which connects the flange part 40 and the flange part 41. As shown in FIG.

  A female screw 44 is bored in the fixed-side shaft portion 38 in the axial direction of the fixed-side shaft portion 38 from a distal end surface 38A (see FIG. 3) of the fixed-side shaft portion 38 located on one side of the casing 2. A bolt 27 is screwed to the through a washer 28. Further, a concave portion 46 that engages with a plurality of convex portions 47 formed on the contact surface 28A (see FIG. 3) of the washer 28 is formed on the distal end surface 38A of the fixed-side shaft portion 38. The recess 46 will be described later.

  The turning-side shaft portion 39 is formed eccentrically with an eccentric amount ε ′ with respect to the fixed-side shaft portion 38 via the flange portions 40, 41 and the like. The amount of eccentricity ε ′ is set to a value almost the same as the amount of eccentricity ε of the drive shaft 4.

  The spacer 43 is inserted into the fixed-side shaft portion 38 of the auxiliary crank 37 and is sandwiched between the flange portion 40 of the auxiliary crank 37 and the inner ring 23 </ b> B of the fixed-side ball bearing 21. The distance in the thrust direction between the fixed scroll 10 and the orbiting scroll 13 is determined by the thickness dimension of the spacer 43.

  The scroll type air compressor 1 having the above configuration operates as follows. That is, in FIG. 1, when the motor is driven, the drive shaft 4 is rotated, and the turning scroll 13 is turned with respect to the fixed scroll 10, the compression chamber 17 is directed from the outer peripheral side to the center side of the wrap portions 10B and 13B. And continuously shrink between them. Thereby, air is taken in from the suction port 11 to the compression chamber 17 located on the outer peripheral side of the wrap portions 10B and 13B. The air taken into the compression chamber 17 is compressed by the continuous reduction of the compression chamber 17 and is discharged from the discharge port 12 through the discharge pipe 12A.

  Further, the auxiliary crank 37 of each auxiliary crank mechanism 20 rotates as the turning scroll 13 turns. The auxiliary crank mechanism 20 prevents the orbiting scroll 13 from rotating relative to the fixed scroll 10. Further, the auxiliary crank mechanism 20 maintains a high-precision gap in the thrust direction between the fixed scroll 10 and the orbiting scroll 13, maintains the airtightness of each compression chamber 17, and the plate 10 </ b> A of the fixed scroll 10 and the orbiting scroll. The collision prevention with 13 lap parts 13B, the collision prevention with the board 13A of the turning scroll 13, and the wrap part 10B of the fixed scroll 10, etc. are achieved.

  FIG. 3 shows the auxiliary crank 37, the bolt 27, and the washer 28 in the auxiliary crank mechanism 20 in FIG. 2 in an exploded state. FIG. 4 shows a front end surface 38A of the fixed-side shaft portion 38 of the auxiliary crank 37 in FIG. FIG. 5 shows the contact surface 28A of the washer 28 in FIG.

  As shown in FIG. 3, between the fixed side shaft portion 38 of the auxiliary crank 37 and the washer 28, when the bolt 27 is fastened to the female screw 44 of the fixed side shaft portion 38, the fixed side shaft portion 38 and the washer 28. The engaging part 45 which mutually engages is provided.

  The engaging portion 45 includes a concave portion 46 provided on the fixed-side shaft portion 38 of the auxiliary crank 37 and a convex portion 47 provided on the washer 28 and engaging the concave portion 46. That is, as shown in FIG. 4, for example, two concave portions 46 are formed in the distal end surface 38 </ b> A of the fixed-side shaft portion 38 so as to be separated in the circumferential direction. On the other hand, as shown in FIG. 5, for example, two convex portions 47 are formed on the contact surface 28 </ b> A of the washer 28 so as to be separated in the circumferential direction. The two concave portions 46 of the fixed-side shaft portion 38 and the two convex portions 47 of the washer 28 are disposed at portions facing each other so as to engage with each other. Further, each recess 46 and each projection 47 are engaged with each recess 46 and each projection 47 to fasten the bolt 27 to the female screw 44 of the fixed side shaft portion 38 and the fixed side shaft. The portion 38 is formed in a shape that does not shift in the circumferential direction.

  Further, the washer 28 is provided with a tool mounting portion 48 for mounting a tool for preventing the washer 28 from rotating together with the bolt 27 when the bolt 27 is fastened to the fixed side shaft portion 38. That is, as shown in FIG. 5, the washer 28 has a hexagonal outer shape, and the outer periphery of the hexagonal washer 28 hits the tool mounting portion 48. In this case, the tool is, for example, a wrench or a spanner.

  In the manufacture of the scroll type air compressor 1, the turning-side shaft portion 39 of the auxiliary crank 37 is inserted into the turning-side ball bearing 31 previously attached to the turning scroll 13, and the fixed-side ball bearing previously attached to the fixed scroll 10. 21, the fixed side shaft portion 38 of the auxiliary crank 37 is inserted, and the orbiting scroll 13 and the fixed scroll 10 are positioned and overlapped. Thereafter, the washer 28 is inserted into the fixed-side shaft portion 38 of the auxiliary crank 37 from the outside in the axial direction of the distal end portion of the fixed-side shaft portion 38, and the concave portion 46 of the fixed-side shaft portion 38 and the convex portion 47 of the washer 28 are connected. Engage with each other. Subsequently, for example, a wrench is mounted on the tool mounting portion 48 of the washer 28, and the washer 28 is pressed by the wrench so as not to rotate. Then, while stopping the washer 28 with the wrench in this way, the bolt 27 is attached to the female screw 44 of the fixed side shaft portion 38 and the bolt 27 is tightened. Accordingly, the fixed side ball bearing 21 is fixed to the fixed side shaft portion 38 while preload is applied to the fixed side ball bearing 21.

  The fixed-side shaft portion 38 and the washer 28 are not displaced in the circumferential direction (that is, the rotation direction of the bolt 27 when the bolt 27 is fastened or removed) by the engagement of the concave portions 46 and the convex portions 47. Are combined. As a result, when the bolt 27 is tightened, the washer 28 is prevented from turning by a wrench, so that the auxiliary crank 37 and thus the turning scroll 13 can be prevented from turning. Therefore, even if the orbiting scroll 13 is not fixed using a jig or the like, the orbiting scroll 13 is prevented from moving due to the rotational force when the bolt 27 is tightened (that is, the tightening force) or the rotational force when the bolt 27 is removed. can do.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 shows the auxiliary crank, the bolt and the washer of the auxiliary crank mechanism in the scroll type air compressor according to the second embodiment in an exploded state. FIG. 7 shows the front end surface of the fixed-side shaft portion of the auxiliary crank in FIG. FIG. 8 shows the contact surface of the washer in FIG. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  As shown in FIG. 6, between the fixed side shaft portion 52 of the auxiliary crank 51 and the washer 53 in the auxiliary crank mechanism of the scroll type air compressor according to the second embodiment of the present invention, the bolt 27 is fixed on the fixed side. An engagement portion 55 is provided for engaging the fixed-side shaft portion 52 and the washer 53 with each other when the shaft portion 52 is fastened to the female screw 54.

  The engaging portion 55 has a convex portion 56 provided on the fixed-side shaft portion 52 and a concave portion 57 provided on the washer 53 and engaging the convex portion 56. That is, as shown in FIG. 7, for example, two convex portions 56 are formed on the distal end surface 52 </ b> A of the fixed-side shaft portion 52 so as to be separated in the circumferential direction. On the other hand, as shown in FIG. 8, for example, two concave portions 57 are formed on the contact surface 53 </ b> A of the washer 53 so as to be separated from each other in the circumferential direction. The two convex portions 56 of the fixed-side shaft portion 52 and the two concave portions 57 of the washer 53 are arranged at portions facing each other so as to engage with each other. Further, each convex portion 56 and each concave portion 57 are connected to the washer 53 and the fixed side shaft when the convex portion 56 and each concave portion 57 are engaged to fasten the bolt 27 to the female screw 54 of the fixed side shaft portion 52. The portion 52 is formed in a shape that does not shift in the circumferential direction.

  Further, the washer 53 is provided with a tool mounting portion 58 for mounting a tool for preventing the washer 53 from rotating together with the bolt 27 when the bolt 27 is fastened to the fixed side shaft portion 52. That is, the outer peripheral portion of the hexagonal washer 53 shown in FIG.

  Also in the scroll air compressor of the second embodiment having such a configuration, a washer 53 is used by a wrench when the bolt 27 is tightened, as in the scroll air compressor 1 of the first embodiment described above. By stopping the rotation of the orbiting scroll, the orbiting scroll can be moved by the rotational force when the bolt 27 is tightened (ie, the tightening force) or the rotational force when the bolt 27 is removed without fixing the orbiting scroll using a jig or the like. This can be prevented.

  Further, the washer 28 provided between the fixed side shaft portion 38 of the auxiliary crank 37 and the bolt 27 shown in FIGS. 1 to 3 may be replaced with a washer 61 shown in FIGS. 9 and 10. On the contact surface 61A of the washer 61, two convex portions 62 that engage with the two concave portions 46 of the fixed-side shaft portion 38 of the auxiliary crank 37 are formed, respectively, similarly to the washer 28. The washer 61 has a circular outer shape, and two grooves 63 are formed on the outer peripheral side of the washer 61 with an interval of 180 degrees. These groove portions 63 correspond to a tool mounting portion for mounting a tool for suppressing the washer 61 from rotating together with the bolt 27 when the bolt 27 is fastened to the fixed-side shaft portion 38. In this case, a tool 64 as shown in FIGS. 9 and 11 is used as a tool for suppressing the rotation of the washer 61. A hole 65 through which the head portion of the bolt 27 is passed is formed in the tip portion of the tool 64, and two protrusions 66 for engaging with the two groove portions 63 of the washer 61 are integrally formed. Yes.

  Even with such a configuration, when the bolt 27 is tightened, the washer 61 is prevented from rotating by the tool 64, so that the rotational force at the time of tightening the bolt 27 can be obtained without fixing the orbiting scroll 13 using a jig or the like. Alternatively, it is possible to prevent the orbiting scroll 13 from moving due to the rotational force when the bolt 27 is removed.

  Further, the washer 53 provided between the fixed side shaft portion 52 of the auxiliary crank 51 and the bolt 27 shown in FIG. 6 may be replaced with the washer 71 shown in FIGS. 12 and 13. The washer 71 is formed in a disk shape, for example. Similarly to the washer 53, two contact portions 71 </ b> A of the washer 71 that contacts the fixed side shaft portion 52 of the auxiliary crank 51 respectively engage with the two convex portions 56 of the fixed side shaft portion 52. A recess 72 is formed. In addition, two holes 73 are formed at an interval of 180 degrees on a surface 71B located on the outer peripheral side of the washer 71 and opposite to the contact surface 71A of the washer 71. These holes 73 are contacted with a tool mounting portion for mounting a tool for preventing the washer 71 from rotating together with the bolt 27 when the bolt 27 is fastened to the fixed-side shaft portion 52. In this case, a tool 74 as shown in FIGS. 12 and 14 is used as a tool for suppressing the rotation of the washer 71. A hole 75 through which the head part of the bolt 27 is passed is formed at the tip of the tool 74, and two pins 76 for engaging with the two holes 73 of the washer 71 are attached. .

  Even in such a configuration, when the bolt 27 is fastened, the washer 71 is prevented from turning by the tool 74, so that the rotational force or the bolt 27 is fastened without fixing the orbiting scroll using a jig or the like. It is possible to prevent the orbiting scroll from moving due to the rotational force when the bolt 27 is removed.

  Further, the washer 53 provided between the fixed side shaft portion 52 of the auxiliary crank 51 and the bolt 27 shown in FIG. 6 may be replaced with a washer 81 shown in FIGS. 15 and 16. The washer 81 is formed in a disk shape, for example. Similarly to the washer 53, two contact portions 81A of the washer 81 that contact the fixed side shaft portion 52 of the auxiliary crank 51 are respectively engaged with the two convex portions 56 of the fixed side shaft portion 52. A recess 82 is formed. In addition, two grooves 83 are formed on the surface 81B opposite to the contact surface 81A of the washer 81 with an interval of 180 degrees. These grooves 83 correspond to a tool mounting portion for mounting a tool for preventing the washer 81 from rotating together with the bolt 27 when the bolt 27 is fastened to the fixed-side shaft portion 52. In this case, a tool 84 as shown in FIGS. 15 and 17 is used as a tool for suppressing the rotation of the washer 81. A hole 85 through which the head portion of the bolt 27 is passed is formed at the tip of the tool 84, and two protrusions 86 for engaging with the two grooves 83 of the washer 81 are attached. ing.

  Even with such a configuration, when the bolt 27 is tightened, the washer 81 is prevented from turning by the tool 84, so that the rotational force or the bolt 27 can be tightened without fixing the orbiting scroll using a jig or the like. It is possible to prevent the orbiting scroll from moving due to the rotational force when the bolt 27 is removed.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 18 shows an auxiliary crank mechanism in a scroll type air compressor according to the third embodiment of the present invention. FIG. 18 shows the configuration of one auxiliary crank mechanism among a plurality of auxiliary crank mechanisms included in the scroll type air compressor, but the other auxiliary crank mechanisms have the same configuration. Moreover, about the site | part which is common in other embodiment, it represents with the same name and the same code | symbol.

  In the auxiliary crank mechanism 90 in FIG. 18, the turning-side shaft portion 92 of the auxiliary crank 91 is inserted through the cap member 93 into the inner rings 32 </ b> B and 33 </ b> B of the turning-side ball bearing 31. The cap member 93 is formed in a bottomed cylindrical shape, and includes a disc-shaped bottom portion 93A, a cylindrical portion 93B that extends in the axial direction from the bottom portion 93A, and a flange that extends outward in the radial direction provided on the opening side of the cylindrical portion 93B. 93C. The cap member 93 is press-fitted and fixed to the inner rings 32B and 33B, and rotates integrally with the inner rings 32B and 33B. Further, on the inner peripheral side of the cylindrical portion 93B, a small-diameter hole portion 93D is formed on the bottom side of the cap member 93, and a large-diameter hole is formed on the opening side of the cap member 93 as compared with the diameter of the hole portion 93D. A portion 93E is formed.

  The auxiliary crank 91 is configured by a fixed side shaft portion 94, a turning side shaft portion 92, a flange portion 95, and a flange portion 96 in substantially the same manner as the auxiliary crank 37 in the first embodiment. 97 and two recesses 98 are formed. The diameter of the turning side shaft portion 92 of the auxiliary crank 91 is adapted to the diameter of the small diameter hole portion 93D located on the bottom side of the cap member 93, so that the turning side shaft portion 39 of the auxiliary crank 37 in the first embodiment is used. Smaller than the diameter. The distal end portion of the turning-side shaft portion 92 of the auxiliary crank 91 is tightly fitted in the small-diameter hole portion 93 </ b> D of the cap member 93. As a result, the tip end portion of the turning-side shaft portion 92 is attached to the turning-side ball bearing 31 so as not to be displaced in the axial direction and the radial direction. On the other hand, a gap d1 having a predetermined dimension is formed between the outer periphery of the proximal end portion of the turning-side shaft portion 92 and the large-diameter hole portion 93E of the cap member 93. That is, the base end portion of the turning-side shaft portion 92 is a non-restraining portion 99 that is not restrained by the cap member 93 or the turning-side ball bearing 31. Moreover, the length dimension of the turning-side shaft portion 92 is formed longer than the depth dimension of the cap member 93 including the hole portion 93D and the hole portion 93E. Thus, a gap d2 having a predetermined dimension is formed between the flange portion 93C of the cap member 93 and the flange portion 96 of the auxiliary crank 91, and the flange portion 96C and the flange portion 96 are not in contact with each other. When centrifugal force is applied to the orbiting scroll 13 by the orbiting of the orbiting scroll 13, the non-restraining portion 99 of the orbiting side shaft portion 92 of the auxiliary crank 91 is deformed with the flange portion 96 as a fulcrum by the gaps d1 and d2. 91 is displaced in the radial direction. As a result, the centrifugal force acting on the orbiting scroll 13 can be alleviated from acting on the auxiliary crank 91, and the durability of the auxiliary crank 91 can be prevented from being lowered.

  Also in the third embodiment of the scroll type air compressor having such a configuration, when the bolt 27 is tightened, the washer 28 is prevented from turning by a tool such as a wrench or a spanner, so that the orbiting scroll is used. Even if 13 is not fixed, it is possible to prevent the orbiting scroll 13 from moving due to the rotational force when the bolt 27 is fastened or the rotational force when the bolt 27 is removed.

  In the third embodiment of the scroll type air compressor, the gaps d1 and d2 are formed so that the unconstrained portion 99 of the turning side shaft portion 92 in the auxiliary crank 91 can be displaced, and the turning scroll 13 is acted upon turning. A configuration is employed in which the durability of the auxiliary crank 91 is prevented from being lowered by the centrifugal force. For the convenience of adopting such a configuration, when the bolt 27 is fastened to the female screw 97 of the fixed side shaft portion 94, it is assumed that the washer 28 is not pressed by a tool so as not to rotate (or the auxiliary crank 91 is fixed). If there is no engaging portion for mutually engaging the side shaft portion 94 and the washer 28), a tightening force by tightening the bolt 27 is applied to the auxiliary crank 91. For this reason, the auxiliary crank 91 is inclined and the orbiting scroll 13 comes out of the fixed scroll 10 side, or a large stress is applied to the base end of the orbiting side shaft portion 92 of the auxiliary crank 91, and the orbiting side shaft portion 92 is bent or broken. It is assumed that However, according to the third embodiment of the scroll type air compressor of the present invention, when the bolt 27 is tightened, the washer 28 is stopped by a tool such as a wrench or a spanner, so that the bolt 27 is tightened when the bolt 27 is tightened. It is possible to prevent force from being applied to the auxiliary crank 91. Thereby, it is possible to prevent the auxiliary crank 91 from inclining and the orbiting scroll 13 from coming out of the fixed scroll 10 side. Moreover, it can prevent that a big stress is added to the base end of the turning side axial part 92 of the auxiliary | assistant crank 91, and can prevent that the turning side axial part 92 bends or bends.

  In each of the above embodiments, an oil-free scroll air compressor is used as an example of the scroll fluid machine. However, the present invention is not limited to this, and a refrigerant compressor, a vacuum pump, and an expander that compress refrigerant are used. It can also be applied to other scroll type fluid machines.

  Further, the shapes of the concave portions 46, 57, 72, 82, 98 and the convex portions 47, 56, 62 constituting the engaging portions 45, 55 shown in FIGS. 3 to 17, and the shapes of the tool mounting portions 48, 58, etc. Furthermore, the shape of the tools 64, 74, and 84 is not limited to that shown in the figure. Other shapes may be employed as long as they are suitable for engaging the fixed-side shaft portion and the washer with each other when the mounting member is fastened to the internal thread of the fixed-side shaft portion of the auxiliary crank. Further, the number of the concave portions 46, 57, 72, 82, 98 and the convex portions 47, 56, 62 is not limited.

  As described above, the scroll fluid machine according to the first aspect of the present invention includes the mounting member that is screwed into the female screw of the fixed-side shaft portion of the auxiliary crank and fixes the fixed-side ball bearing between the auxiliary crank and the flange portion. A washer provided between the fixed side shaft portion and the mounting member, and an engaging portion for engaging the fixed side shaft portion and the washer with each other when the mounting member is fastened to the female screw of the fixed side shaft portion. It has. With such a configuration, when the mounting member is fastened to the female screw of the fixed-side shaft portion of the auxiliary crank in the manufacture of the scroll fluid machine, a jig or the like can be obtained by tightening the mounting member while holding the washer with a tool. Even if the orbiting scroll is not fixed by using this, it is possible to prevent the orbiting scroll from moving due to the tightening force generated by tightening the mounting member. Accordingly, the process of fixing the orbiting scroll using a jig or the like can be omitted in the assembly process of the fixed scroll, the orbiting scroll and the auxiliary crank mechanism at the time of manufacturing the scroll type fluid machine. Assembly work such as scroll and auxiliary crank mechanism can be simplified.

  Specifically, according to the scroll type air compressor 1 according to the first embodiment of the present invention described above, in the manufacture of the scroll type air compressor 1, the bolt 27 is connected to the fixed side shaft portion 38 of the auxiliary crank 37. When tightening to the female screw 44, the bolt 27 is tightened while holding the washer 28 with a tool, so that the tightening force generated by tightening the bolt 27 without fixing the orbiting scroll 13 using a jig or the like. Thus, the orbiting scroll 13 can be prevented from moving. Therefore, the assembling work of the fixed scroll 10, the orbiting scroll 13, the auxiliary crank mechanism 20, and the like can be simplified.

  Further, like the scroll type air compressor according to the third embodiment of the present invention described above, gaps d1 and d2 are formed around the base end portion of the turning side shaft portion 92 in the auxiliary crank 91, and the turning side shaft portion is formed. When the non-restraining portion 99 is provided at the base end portion of 92, when the bolt 27 is fastened to the fixed side shaft portion 94 of the auxiliary crank 91 in the manufacture of the scroll type air compressor, a tool is used. By tightening the bolt 27 while holding the washer 28, it is possible to prevent a large stress from being applied to the base end of the turning-side shaft portion 92 of the auxiliary crank 91 due to the tightening force generated by tightening the bolt 27. It is possible to prevent the durability of 91 from being lowered.

  According to the scroll fluid machine of the second aspect of the present invention, the fixed side shaft portion 38 of the auxiliary crank 37 and the washer 28 are engaged with each other as in the scroll air compressor 1 of the first embodiment, for example. The engaging portion 45 is configured by a concave portion 46 provided on the fixed-side shaft portion 38 and a convex portion 47 provided on the washer 28, whereby the bolt 27 (attachment member) is fixed to the fixed-side shaft of the auxiliary crank 37. When fastened to the female screw 44 of the portion 38, it is possible to easily realize the engaging portion 45 that can reliably engage the fixed-side shaft portion 38 and the washer 28 with each other.

  According to the scroll type fluid machine of the third aspect of the invention, the fixed side shaft portion 52 of the auxiliary crank 51 and the washer 53 are engaged with each other as in the scroll type air compressor of the second embodiment. The bolt 27 (mounting member) can also be connected to the fixed side shaft of the auxiliary crank 51 by forming the engaging portion 55 from a convex portion 56 provided on the fixed side shaft portion 52 and a concave portion 57 provided on the washer 53. When fastened to the female screw 54 of the portion 52, it is possible to easily realize the engaging portion 55 that can reliably engage the fixed-side shaft portion 52 and the washer 53 with each other.

  According to the scroll fluid machine of the fourth aspect of the present invention, for example, like the scroll air compressor 1 of the first embodiment (see FIG. 5), the bolt 27 (attachment member) is fixed to the auxiliary crank 37 fixed side. Since the tool mounting portion 48 for mounting a tool for preventing the washer 28 from rotating together with the bolt 27 when screwed to the shaft portion 38 is formed in the washer 28, the bolt 27 is fixed to the auxiliary crank 37. When the tool is fastened to the shaft portion 38, the tool is attached to the tool mounting portion 48 of the washer 28, so that the washer 28 can be reliably pressed by the tool, and the tightening force when the bolt 27 is fastened is the orbiting scroll. 13 or the auxiliary crank 37 can be reliably prevented from being added to the base end of the turning side shaft portion 39. Further, in the scroll type air compressor of the second embodiment, the tool mounting portion 58 (see FIG. 8) of the washer 53, the groove portion 63 of the washer 61 in FIG. 10, the hole 73 of the washer 71 in FIG. 16, the washer 53, 61, 71, or 81 can be securely held by a wrench, spanner, or tool 64, 74, 84, and the tightening force when the bolt 27 is tightened is turned orbiting. 13 or the auxiliary crank 37 can be reliably prevented from being added to the base end of the turning side shaft portion 39.

1 Scroll type air compressor (scroll type fluid machine)
2 Casing 4 Drive shaft 4A Crank portion 10 Fixed scroll 13 Orbiting scroll 20, 90 Auxiliary crank mechanism 21 Fixed side ball bearing 27 Bolt (mounting member)
28, 53, 61, 71, 81 Washer 31 Rotating side ball bearing 37, 51, 91 Auxiliary crank 38, 52, 94 Fixed side shaft part 39, 92 Rotating side shaft part 44, 54, 97 Female thread 45, 55 Engagement part 46, 57, 72, 82, 98 Concave portion 47, 56, 62 Convex portion 48, 58 Tool mounting portion 63 Groove portion (tool mounting portion)
73 holes (tool mounting part)
83 Groove (Tool mounting part)

Claims (4)

A casing, a drive shaft that is rotatably provided in the casing and has a crank portion at a front end side thereof, a fixed scroll fixed to the casing, and connected to the crank portion and pivots with respect to the fixed scroll. A orbiting scroll that compresses or expands the fluid and an auxiliary crank mechanism that prevents rotation of the orbiting scroll relative to the fixed scroll or the casing,
The auxiliary crank mechanism includes a fixed side ball bearing provided on the fixed scroll side or the casing side, a turning side ball bearing provided on the orbiting scroll side, and a fixed side supported in the fixed side ball bearing. In a scroll type fluid machine comprising a shaft, and an auxiliary crank comprising a pivot side shaft portion formed eccentrically with respect to the fixed side shaft portion via a flange portion and supported in the pivot side ball bearing,
An attachment member that is screwed into a female screw drilled in the axial direction in the fixed-side shaft portion and fixes the fixed-side ball bearing between the flange portion, and between the fixed-side shaft portion and the attachment member A washer provided, and an engaging portion that engages the fixed-side shaft portion and the washer when the attachment member is fastened to the female screw of the fixed-side shaft portion. Scroll type fluid machine.   2. The scroll fluid machine according to claim 1, wherein the engaging portion includes a concave portion provided in the fixed-side shaft portion and a convex portion provided in the washer and engaged with the concave portion.   2. The scroll fluid machine according to claim 1, wherein the engaging portion includes a convex portion provided on the fixed-side shaft portion and a concave portion provided on the washer and engaged with the convex portion. .   The washer is provided with a tool mounting portion for mounting a tool for suppressing rotation of the washer together with the mounting member when the mounting member is fastened to the fixed-side shaft portion. The scroll fluid machine according to claim 1, 2, or 3.

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