JP5437974B2 - Bearing device and regenerator type refrigerator - Google Patents

Description

  The present invention relates to a bearing device for reciprocatingly driving a displacer, and a regenerator type refrigerator equipped with the bearing device, which are provided in a refrigerator that generates refrigerant by expanding refrigerant gas.

  As a cryogenic refrigerator for obtaining an extremely low temperature of about 4K, for example, a Gifford-McMahon (GM) refrigerator is used.

  The GM refrigerator generates cold by supplying a refrigerant gas made of, for example, helium gas from a compressor to an expansion space formed in the cylinder, and expanding the supplied refrigerant gas in the expansion space.

  Each stage of the GM refrigerator has a cylinder and a displacer provided in the cylinder. The displacer is provided in the cylinder so as to be capable of reciprocating along the cylinder, and forms an expansion space between one end of the displacer and the cylinder. Inside the displacer, a refrigerant gas passage for supplying and discharging refrigerant gas to and from the expansion space is formed. In addition, the refrigerant gas passage formed inside the displacer contains a regenerator material for accumulating cold heat in contact with the refrigerant gas.

  Some of such GM refrigerators include, for example, a motor, a crank member, and a scotch yoke in order to drive the displacer back and forth (see, for example, Patent Document 1). In the example shown in Patent Document 1, the motor generates a rotational driving force, and the crank member is rotationally driven by the motor. The scotch yoke reciprocates the displacer by converting the rotational motion of the crank member that is rotationally driven by the motor into reciprocating motion.

  The crank member has a crankshaft serving as a main shaft and a crankpin extending eccentrically with respect to the crankshaft. The Scotch yoke has a yoke plate on which a horizontally long window is formed, and a vertical shaft provided so as to extend in the vertical direction from the central vertical position of the yoke plate. The crank member is connected to the scotch yoke.

  Between the crank member and the scotch yoke, a bearing device is provided for connecting the crank pin of the crank member and the yoke plate of the scotch yoke so as to be relatively rotatable. As the bearing device, for example, a roller follower having an outer ring and an inner ring provided on the center side of the outer ring and incorporating a needle bearing in the outer ring is used. At this time, the inner ring of the roller follower is connected to the crankpin, and the outer ring of the roller follower is connected to a horizontally long window formed on the yoke plate of the scotch yoke so as to roll freely.

Japanese Patent No. 2617681

  However, the bearing device provided in the GM refrigerator has the following problems.

  When a roller follower is used as a bearing device, the roller follower has a load resistance against a load acting in the radial direction, but has a load resistance against a load acting in the rotation axis direction. Not.

  For example, when the roller follower is provided so as to be rotatable around a horizontal axis, a load should not naturally act on the roller follower in the direction of the rotation axis. However, even in such a case, a load may actually act on the roller follower in the direction of the rotation axis.

  The roller follower includes a member provided on the crank member side (center side), for example, a side plate portion (鍔), and a member provided on the scotch yoke side (outer peripheral side), for example, an outer ring. When a load is applied in the direction of the rotation axis in such a roller follower, the side plate portion (鍔) and the outer ring may be relatively displaced in the direction of the rotation axis and come into contact with each other. If the GM refrigerator is operated for a long time in a state where the side plate portion (外) and the outer ring are in contact with each other in the rotation axis direction, the side plate portion (鍔) or the outer ring may be worn, and the roller follower may be damaged. is there.

  Further, the above-described problems are common problems when not only the roller follower but also various bearing devices such as a cam follower are used. Furthermore, the above-described problem is a problem common not only to the GM refrigerator but also to various refrigerators including a bearing device having a rotating member that can rotate around a rotation shaft.

  The present invention has been made in view of the above points, and in the bearing device provided in the refrigerator, when a load is applied in the direction of the rotating shaft, the rotating member on the center side contacts the rotating member on the outer peripheral side. Thus, a bearing device that can be prevented from being worn is provided.

  In order to solve the above problems, the present invention is characterized by the following measures.

  The present invention includes a crank member that includes a cylinder and a displacer provided in the cylinder so as to be capable of reciprocating, is provided in a refrigerator that expands refrigerant gas to generate cold heat, and is driven to rotate. The crank member In a bearing device provided between a scotch yoke for reciprocally driving the displacer by converting the rotational motion of the displacer into a reciprocating motion, a first rotating member rotatable about a rotating shaft, and the first rotating member The second rotating member provided on the scotch yoke side and rotatable about the rotating shaft, the first rotating member, and the second rotating member are relatively displaced in the rotating shaft direction. It is a bearing apparatus which has a contact prevention member which prevents that it contacts.

  According to the present invention, in the bearing device described above, the first rotating member is a side plate portion, and the second rotating member is an outer ring.

  In the bearing device according to the present invention, the contact prevention member is a thrust washer provided concentrically with the rotating shaft.

  According to the present invention, in the above-described bearing device, the contact prevention member is made of a resin having wear resistance.

  In addition, the present invention is provided with a cylinder and a reciprocating motion in the cylinder, forming an expansion space between the cylinder and supplying and discharging a refrigerant gas into the expansion space inside. A displacer in which a gas flow path is formed, a crank member, a rotational drive unit that rotationally drives the crank member, and a rotational motion of the crank member that is rotationally driven by the rotational drive unit to convert the rotational motion into a reciprocating motion, A drive device that includes a scotch yoke that reciprocally drives the displacer, and is housed in the refrigerant gas flow path, and is supplied to the expansion space when the displacer is reciprocated along the cylinder by the drive device. A cold storage material that stores cold heat generated by expanding the refrigerant gas, and the drive device includes the bearing device described above. A cold device refrigerator.

  ADVANTAGE OF THE INVENTION According to this invention, when a load acts in the direction of a rotating shaft in the bearing apparatus with which a refrigerator is equipped, it can prevent that the rotation member of a center side and the rotation member of an outer peripheral side contact and wear.

It is sectional drawing which shows the structure of the GM refrigerator provided with the bearing apparatus which concerns on embodiment. It is a disassembled perspective view of a Scotch yoke mechanism. It is a disassembled perspective view of the rotary valve apparatus of the GM refrigerator provided with the bearing apparatus which concerns on embodiment. It is sectional drawing which shows the structure of the bearing apparatus which concerns on embodiment. It is sectional drawing which shows the structure of the bearing apparatus which concerns on a comparative example. In the bearing device which concerns on a comparative example, it is sectional drawing which shows a mode that the 1st rotation member and the 2nd rotation member are relatively displaced in the rotating shaft direction and are contacting. It is sectional drawing which shows the structure of another example of a bearing apparatus.

Next, a mode for carrying out the present invention will be described with reference to the drawings.
(Embodiment)
With reference to FIG. 1, the bearing apparatus with which the refrigerator which concerns on embodiment was equipped is demonstrated. A GM refrigerator will be described as an example of a refrigerator provided with a bearing device. The GM refrigerator has a two-stage configuration suitable for obtaining a cryogenic temperature of about several K to 20K.

  FIG. 1 is a cross-sectional view illustrating a configuration of a GM refrigerator including a bearing device according to the present embodiment. FIG. 2 is an exploded perspective view of the scotch yoke mechanism 32. FIG. 3 is an exploded perspective view of the rotary valve device 40 of the GM refrigerator provided with the bearing device according to the present embodiment.

  The GM refrigerator has a compressor 1, a cylinder part 2 and a housing part 3.

The compressor 1 sucks refrigerant gas (helium gas) from the low pressure side 1a. Then, the sucked refrigerant gas is increased in pressure to, for example, about 20 kg / cm ² and cooled, and discharged to the high pressure side 1b.

  The cylinder unit 2 includes a first stage cylinder 11, a second stage cylinder 12, a first stage displacer 13, a second stage displacer 14, internal spaces 15 and 16, and cold storage materials 17 and 18.

  The first stage cylinder 11 and the second stage cylinder 12 are arranged in two upper and lower stages. A first stage displacer 13 and a second stage displacer 14 are slidably provided in the first stage cylinder 11 and the second stage cylinder 12, respectively.

  Expansion spaces 21, 22, and 23 are formed between the first stage displacer 13, the second stage displacer 14, and the first stage cylinder 11 and the second stage cylinder 12. An internal space 15 is formed inside the first stage displacer 13. An internal space 16 is formed inside the second stage displacer 14. Cold storage materials 17 and 18 are accommodated in the internal spaces 15 and 16, respectively.

  The expansion spaces 21, 22, 23 are connected to each other through the internal space 15, the internal space 16, and refrigerant gas flow paths L 1 to L 4 provided in the first stage displacer 13 and the second stage displacer 14. ing. Therefore, the internal spaces 15 and 16 are also refrigerant gas flow paths for supplying and discharging refrigerant gas to the expansion spaces 21, 22, and 23.

  Further, flanges 19 and 20 are provided on the outer periphery of the lower portion of the first stage cylinder 11 and the second stage cylinder 12 so as to be thermally coupled, respectively.

  As shown in FIG. 1, the housing part 3 includes a drive device 30 and a rotary valve device 40.

  The drive device 30 includes a motor 31 and a scotch yoke mechanism 32. The motor 31 generates a rotational driving force. The motor 31 corresponds to the rotation drive unit in the present invention.

  As shown in FIG. 2, the scotch yoke mechanism 32 includes a crank member 33 and a scotch yoke 34, converts the rotational driving force generated by the motor 31 into a reciprocating driving force, and the first stage displacer 13 and the second stage displacer 13. This is for reciprocating the eye displacer 14.

  The crank member 33 is fixed to the rotation shaft 31 a of the motor 31 and is driven to rotate by the motor 31. The crank member 33 is configured such that a crank pin 33b is provided at a position eccentric from a position where the crank member 33 is attached to the rotation shaft 31a of the motor 31. Therefore, when the crank member 33 is attached to the rotating shaft 31a of the motor 31, the rotating shaft 31a and the crank pin 33b are in an eccentric state.

  The scotch yoke 34 includes a yoke plate 35, a vertical shaft 36, and a bearing device 60. The scotch yoke 34 is provided in the housing portion 3 so as to be capable of reciprocating in the Z1 and Z2 directions in FIG. 2 (FIG. 1). A vertical shaft 36 is provided at the central vertical position of the yoke plate 35 so as to extend in the vertical direction (Z1 and Z2 directions). The vertical shaft 36 is supported by sliding bearings 38a and 38b so as to be slidable in the vertical direction (Z1 and Z2 directions).

  The yoke plate 35 is formed with a horizontally long window 35a extending in the directions of arrows X1 and X2 in FIG. 2, and a bearing device 60 is provided in the horizontally long window 35a. The bearing device 60 is provided to be able to roll in the directions of the arrows X1 and X2 within the horizontally long window 35a.

  As will be described later, the bearing device 60 includes an inner ring 61 and an outer ring 62 that are provided to be rotatable relative to each other, and the inner ring 61 is fixed to the crank pin 33b. As the bearing device 60, for example, a roller follower or a cam follower can be used. In the present embodiment, an example in which a roller follower is used as the bearing device 60 will be described below.

  When the rotation shaft 31a rotates with the crank pin 33b engaged with the roller follower 60, the crank pin 33b rotates (eccentric rotation) so as to draw an arc, and the scotch yoke 34 moves in the directions of arrows Z1 and Z2 in FIG. Reciprocate. At this time, the roller follower 60 reciprocates in the horizontal window 35a in the directions of arrows X1 and X2 in FIG.

  A vertical shaft 36 provided at the lower part of the scotch yoke 34 is connected to the first stage displacer 13. Therefore, the Scotch yoke 34 reciprocates the first stage displacer 13 in the directions of arrows Z1 and Z2 in FIG.

  By having such a structure, the crank member 33 is restrained from moving in the axial direction (Y1, Y2 direction) of the crank pin 33b, and the scotch yoke 34 is also in the axial direction (Y1, Y2 direction) of the crank pin 33b. Movement to is restricted.

  As shown in FIG. 1, the rotary valve device 40 is provided between the compressor 1 and the first stage cylinder 11 and the second stage cylinder 12. The rotary valve device 40 is for controlling the flow of the refrigerant gas. Specifically, the rotary valve device 40 guides the refrigerant gas sent from the high-pressure side 1b of the compressor 1 into the first stage cylinder 11 and the second stage cylinder 12, and also the first stage cylinder 11 The refrigerant gas sent from the second stage cylinder 12 is guided to the low pressure side 1 a of the compressor 1.

  As shown in FIGS. 1 and 3, the rotary valve device 40 includes a valve body 41 and a valve plate 42. The valve body 41 and the valve plate 42 have flat surfaces, and the flat surfaces are in surface contact with each other.

  The valve body 41 is fixed in the housing part 3 by a fixing pin 43. The valve plate 42 is engaged with the tip of the crank pin 33b so that the valve plate 42 rotates as the crank pin 33b rotates (eccentric rotation) around the crank shaft 33a (the rotation shaft 31a of the motor 31). ing.

  In the center of the valve body 41, a refrigerant gas intake hole 44 connected to the high-pressure side 1b of the compressor 1 is penetrated. As shown in FIG. 3, the valve plate side end surface 45 is provided with an arc-shaped groove 46 on a concentric circle centered on the refrigerant gas intake hole 44. The valve body 41 is provided with a through hole 48 having one end opened in the arc-shaped groove 46 and the other end opened as a discharge hole 47 in the side surface of the valve body 41. Further, the discharge hole 47 communicates with the expansion space 23 through a passage 49.

  On the valve body side end surface 50 of the valve plate 42, a groove 51 extending in the radial direction from the center thereof is provided. Further, an arc-shaped hole 53 is formed at a position on the same circumference as the arc-shaped groove 46 of the valve body 41 so as to penetrate from the valve body-side end face 50 to the opposite end face 52 of the valve plate 42.

  The refrigerant gas intake hole 44, the groove 51, the arc-shaped groove 46, and the through hole 48 constitute an intake valve. Further, the exhaust hole is configured by the through hole 48, the arc-shaped groove 46, and the arc-shaped hole 53.

  When the scotch yoke 34 reciprocates in the Z1 and Z2 directions, the first-stage displacer 13 and the second-stage displacer 14 are reciprocated in the Z1 and Z2 directions, respectively, in the first-stage cylinder 11 and the second-stage cylinder, respectively. The cylinder 12 reciprocates between the bottom dead center LP and the top dead center UP.

  When the first stage displacer 13 and the second stage displacer 14 reach the bottom dead center LP, the exhaust valve is closed and a refrigerant gas flow path is formed between the through hole 48, the arc-shaped groove 46, and the groove 51. Is done. The high-pressure refrigerant gas begins to fill the expansion space 23 via the passage 49 in the housing part 3. Thereafter, the first-stage displacer 13 and the second-stage displacer 14 start to rise past the bottom dead center LP, and the refrigerant gas passes from the top to the bottom of the regenerator materials 17 and 18 and fills the expansion spaces 21 and 22. It will be done.

  When the first stage displacer 13 and the second stage displacer 14 reach the top dead center UP, the intake valve is closed and the refrigerant gas is interposed between the through hole 48 and the arc-shaped groove 46 and the arc-shaped hole 53. A flow path is formed. The high-pressure refrigerant gas adiabatically expands to generate cold heat, cools the flanges 19 and 20 with the generated cold heat, and passes from the bottom to the top while cooling the regenerator materials 17 and 18. Begin refluxing to side 1a. At this time, the generated cold energy is stored by using the regenerator materials 17 and 18 as a regenerator.

  Thereafter, when the first stage displacer 13 and the second stage displacer 14 reach the bottom dead center LP, the exhaust valve is closed and the intake valve is opened to complete one cycle. In this way, by repeating the cycle of compression and expansion of the refrigerant gas, the refrigerator generates cold and can store the generated cold.

  Instead of the rotary valve device 40, a switching device constituted by an intake valve and an exhaust valve is provided on the compressor 1 side outside the housing portion 3, and the compressor 1 and the expansion spaces 21 to 23 are provided by the switching device. May be connected so that the intake valve and the exhaust valve can be switched in synchronization with the reciprocation of the displacer. When the first stage displacer 13 and the second stage displacer 14 reciprocate, the connection between the expansion spaces 21 to 23 and the low pressure side 1a and high pressure side 1b of the compressor 1 is switched by the switching device. The cycle of refrigerant gas compression and expansion can be repeated.

  Next, the configuration of the roller follower (bearing device) 60 will be described. FIG. 4 is a cross-sectional view showing the configuration of the bearing device (roller follower 60) according to the present embodiment. In FIG. 4, the crank pin 33b of the crank member 33 is also shown.

  As shown in FIG. 4, the roller follower 60 includes an inner ring 61, an outer ring 62, a rolling element 63, a cage 64, a large-diameter stepped portion 65, a side plate portion (ridge) 66, a seal 67, and a contact prevention member 68.

  In the present embodiment, as described above, since the inner ring 61 is engaged with the crank pin 33b, the outer ring 62 is provided on the scotch yoke 34 side of the inner ring 61. Accordingly, the side plate portion (鍔) 66 corresponds to the first rotating member in the present invention, and the outer ring 62 corresponds to the second rotating member in the present invention.

  An inner ring 61 is incorporated in the outer ring 62. Between the inner peripheral surface of the outer ring 62 and the outer peripheral surface of the inner ring 61, there is provided a rolling element 63 made of a roller for making the outer ring 62 rotatable relative to the inner ring 61. As the rolling element 63, for example, a cylindrical shape (needle bearing), a spherical shape (ball bearing) or the like can be used. In addition, a cage 64 is provided between the inner peripheral surface of the outer ring 62 and the outer peripheral surface of the inner ring 61 to maintain the spacing between the adjacent rolling elements 63.

  A large-diameter step portion 65 is formed on the inner peripheral surface of the outer ring 62 at both ends along the rotation axis so that the inner peripheral surface of the outer ring 62 is notched. A pair of side plate portions (ridges) 66 are fitted and fixed to the end portions of the inner ring 61 on the outer peripheral surface of the inner ring 61 and facing the large-diameter stepped portion 65.

  As a material of the inner ring 61, the outer ring 62, the rolling element 63, the cage 64, and the side plate part (鍔) 66, for example, martensitic stainless steel such as SUS440C or ferritic stainless steel subjected to appropriate thermosetting treatment, A precipitation hardened stainless steel such as SUS630, or an austenitic stainless steel such as SUS316 subjected to a surface hardening treatment can be used.

  In an annular space S formed between the inner ring 61 and the outer ring 62, a lubricant made of grease, for example, is injected. A seal 67 is provided on the inner peripheral surface of the large-diameter stepped portion 65 provided on both sides in the axial direction of the outer ring 62 to seal the lubricant in sliding contact with the outer peripheral surface of the side plate portion (鍔) 66. . As the seal 67, a synthetic rubber such as NBR or ACN (acrylic rubber) can be used.

  The contact preventing member 68 is provided between the first rotating member provided on the crank member 33 side and the second rotating member provided on the scotch yoke mechanism 32 side of the first rotating member. . The contact preventing member 68 is for preventing the first rotating member and the second rotating member from making a relative displacement in the rotating shaft direction of the roller follower 60 and contacting.

  The first rotating member and the second rotating member are provided on the roller follower 60 on the crank member 33 side and the scotch yoke 34 side, respectively, so as to be rotatable around the rotating shaft, and a load acts in the rotating shaft direction. Any member that may come into contact when it is relatively displaced is acceptable. Therefore, in the present embodiment, the first rotating member can be, for example, the side plate portion (鍔) 66 fitted and fixed to the inner ring 61, and the second rotating member can be, for example, the outer ring 62. be able to. That is, since there is a possibility that the side plate portion (鍔) 66 and the outer ring 62 may come into contact with each other, the contact prevention member 68 is preferably provided between the side plate portion (鍔) 66 and the outer ring 62. As a result, the contact between the side plate portion (６６) 66 and the outer ring 62 can be prevented, and even when a load is applied in the direction of the rotation axis and relative displacement is caused, the contact between the side plate portion (鍔) 66 and the outer ring 62 can be prevented. It is possible to prevent sliding and wear due to sliding.

  Further, as the contact preventing member 68, for example, a thrust washer is preferably used. Thereby, it is possible to prevent contact between the side plate portion (６６) 66 and the outer ring 62 using a simple member, and even when a load is applied in the direction of the rotation axis and relative displacement is caused, the side plate portion (鍔) 66. The sliding between the outer ring 62 and the outer ring 62 and the wear due to the sliding can be prevented.

  Moreover, it is preferable that the contact prevention member 68 is comprised with resin which has abrasion resistance. Thereby, even when the contact prevention member 68 itself contacts the side plate portion (saddle) 66 or the outer ring 62, it is possible to prevent generation of wear powder due to wear of the contact prevention member 68 itself. As the resin having wear resistance, for example, a fluororesin, a PEEK resin, or the like can be used.

  In FIG. 4, the side plate portion (板) 66 and the thrust washer 68 and the thrust washer 68 and the outer ring 62 are shown in contact with each other. However, in practice, there are minute gaps between the side plate portion (鍔) 66 and the thrust washer 68, and between the thrust washer 68 and the outer ring 62, and the gap is surrounded by the surroundings. As in the annular space S, the above-described lubricant made of grease, for example, is injected. Accordingly, the side plate portion (鍔) 66 and the thrust washer 68 and between the thrust washer 68 and the outer ring 62 are configured to be freely rotatable relative to each other without sliding through the lubricant.

  Next, referring to the comparative example, in the bearing device according to the present embodiment, when a load is applied in the direction of the rotation axis of the roller follower, the first rotating member and the second rotating member come into contact with each other and wear out. The effect which can prevent doing is demonstrated. FIG. 5 is a cross-sectional view illustrating a configuration of a bearing device (roller follower 160) according to a comparative example. FIG. 6 is a cross-sectional view showing a state in which the first rotating member and the second rotating member are in relative displacement and contact with each other in the rotation axis direction in the bearing device (roller follower 160) according to the comparative example.

  As shown in FIG. 5, the bearing device (roller follower 160) according to the comparative example has an inner ring 61, an outer ring 62, a rolling element 63, a cage 64, a large-diameter step portion 65, and a side plate portion (鍔) 66. These are the same as the bearing device (roller follower 60) according to the embodiment. However, the bearing device (roller follower 160) according to the comparative example does not have a contact preventing member.

  When the crank shaft 33a and the crank pin 33b of the crank member 33 are provided, and the vertical shaft 36 of the scotch yoke 34 is provided so as to extend in the vertical direction, the rotation shaft of the roller follower 160 is also the crank shaft. It extends in the same direction as the rotation axis of 33a. Further, as described above, the crank member 33 is restrained from moving in the axial direction (Y1, Y2 direction) of the crank pin 33b, and the scotch yoke 34 is also moved in the axial direction (Y1, Y2 direction) of the crank pin 33b. Movement is constrained. Therefore, originally, no load should act on the roller follower 160 in the rotation axis direction.

  However, the inventors have actually found that a load acts on the roller follower 160 in the direction of the rotation axis in the GM refrigerator having the roller follower 160 arranged as described above as a bearing device.

  As described above, the cause of the load acting on the roller follower 160 in the direction of the rotation axis where the load should not be applied can be, for example, the dimensional tolerance of each member.

  For example, there may be a case where the crank member 33 reciprocates slightly in the axial direction (Y1, Y2 direction) of the roller follower 160 as the crank member 33 rotates due to a dimensional tolerance of the crank member 33 or the like. Further, due to dimensional tolerances of the scotch yoke 34, the yoke plate 35, the laterally long window 35a, the vertical shaft 36, the sliding bearings 38a, 38b, etc., the scotch yoke 34 is moved to the shaft of the roller follower 160 as the scotch yoke 34 moves up and down. The case where it reciprocates minutely in the direction (Y1, Y2 direction) can be considered. Further, due to the dimensional tolerances of the inner ring 61, the outer ring 62, the cage 64, the side plate portion (鍔) 66, etc. of the roller follower 160, the inner ring 61 and the outer ring are accompanied by the rotational movement of the crank member 33 and the vertical movement of the scotch yoke 34. 62, the cage 64, the side plate portion (鍔) 66, and the like may be reciprocally moved in the axial direction (Y1, Y2 direction) of the roller follower 160.

  Then, the side plate portion (鍔) 66 that is the first rotating member provided on the crank member 33 side and the outer ring 62 that is the second rotating member provided on the scotch yoke 34 side of the first rotating member, There may be a relative displacement in the direction of the rotation axis and contact. This contact is referred to as a so-called metal touch when both the side plate portion (鍔) 66 and the outer ring 62 are made of metal. FIG. 6 shows a state in which the side plate portion (saddle) 66 and the outer ring 62 are in contact with each other while being relatively displaced in the rotation axis direction (Y1, Y2 direction) of the roller follower 160.

  As shown in a region I surrounded by a dotted line in FIG. 6, when the GM refrigerator is operated for a long time in a state where the side plate portion (と) 66 and the outer ring 62 are in contact, the side plate portion (鍔) 66 and the outer ring There is a possibility that both or any of 62 may be worn and the roller follower 160 may be damaged.

  On the other hand, the bearing device (roller follower 60) according to the present embodiment performs the first rotation between the side plate portion (板) 66 that is the first rotating member and the outer ring 62 that is the second rotating member. A contact preventing member 68 for preventing contact between the member and the second rotating member is provided. Therefore, due to the dimensional tolerance of each member, etc., when the side plate portion (鍔) 66 and the outer ring 62 are relatively displaced in the rotational axis direction of the roller follower 60 as the crank member 33 rotates and the scotch yoke 34 moves up and down. However, it is possible to prevent contact between the side plate portion (鍔) 66 and the outer ring 62. Even when the GM refrigerator is operated for a long time, neither the side plate portion (部) 66 nor the outer ring 62 is worn, and the roller follower 60 is damaged due to wear of the side plate portion (鍔) 66 or the outer ring 62. There is no fear.

  In addition, according to the present embodiment, it is possible to provide load resistance to both the radial load and the rotational axis load without changing the size and appearance of the roller follower. Therefore, a change due to the influence of a disturbance such as stress can be prevented without changing the design of the current GM refrigerator, that is, the robustness can be improved.

  In the present embodiment, an example has been described in which the first rotating member is, for example, the side plate portion (鍔) 66 fitted and fixed to the inner ring 61, and the second rotating member is, for example, the outer ring 62. . Here, in the example shown in FIG. 4, the thrust washer 68 is also provided between the side plate portion (鍔) 66 and the cage 64. For this reason, the contact between the side plate portion (鍔) 66 and the cage 64 can be prevented, and the wear between the side plate portion (６６) 66 and the cage 64 can also be prevented.

  In FIG. 4, the thrust washer 68 and the large-diameter step portion 65 are shown in contact with each other. However, in practice, a minute gap is provided between the thrust washer 68 and the large-diameter step portion 65, and the gap, for example, the grease described above, as in the surrounding annular space S, is provided. A lubricant consisting of Therefore, the thrust washer 68 and the large-diameter step portion 65 are configured to be freely rotatable relative to each other without sliding through the lubricant.

  In the present embodiment, an example in which a roller follower having an inner ring and an outer ring is used as the bearing device has been described. However, the present invention can also be applied to an example in which a cam follower having a stud shaft is used instead of the inner ring as the bearing device.

  Further, in the present embodiment, as shown in FIG. 4, the example in which the thrust washer 68 is also provided between the side plate portion (鍔) 66 and the cage 64 has been described. However, in the present invention, as shown in FIG. 7, a thrust washer 68 a may be provided only between the outer ring 62 and the side plate portion (saddle) 66.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims. Can be modified or changed.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Cylinder part 3 Housing part 11 1st stage cylinder 12 2nd stage cylinder 13 1st stage displacer 14 2nd stage displacer 15, 16 Internal space 17, 18 Cold storage material 21, 22, 23 Expansion space 30 Drive device 31 Motor 31a Rotating shaft 32 Scotch yoke mechanism 33 Crank member 33a Crank shaft 33b Crank pin 34 Scotch yoke 40 Rotary valve device 41 Valve body 42 Valve plate 60 Roller follower (bearing device)
61 Inner ring 62 Outer ring 63 Rolling element 64 Cage 65 Large diameter step part 66 Side plate part (部)
67 Seal 68 Contact prevention member

Claims (5)

A crank member that includes a cylinder and a displacer provided in the cylinder so as to be capable of reciprocating, and that is provided in a refrigerator that expands refrigerant gas to generate cold heat; and a rotationally driven crank member; In a bearing device provided between a scotch yoke that reciprocates and converts the displacer into a reciprocating motion,
A first rotating member rotatable around a rotation axis;
A second rotating member provided on the scotch yoke side of the first rotating member and rotatable about the rotating shaft;
A bearing device comprising: a contact preventing member that prevents the first rotating member and the second rotating member from making a relative displacement in the direction of the rotating shaft and contacting. The first rotating member is a side plate portion,
The bearing device according to claim 1, wherein the second rotating member is an outer ring.   The bearing device according to claim 1, wherein the contact prevention member is a thrust washer provided concentrically with the rotating shaft.   The bearing device according to any one of claims 1 to 3, wherein the contact preventing member is made of a resin having wear resistance. A cylinder,
A displacer provided in the cylinder so as to be capable of reciprocating and forming an expansion space between the cylinder and a refrigerant gas passage for supplying and discharging refrigerant gas to and from the expansion space. When,
A drive including a crank member, a rotational drive unit that rotationally drives the crank member, and a scotch yoke that converts the rotational motion of the crank member that is rotationally driven by the rotational drive unit into a reciprocating motion and reciprocally drives the displacer Equipment,
Cold storage that is stored in the refrigerant gas flow path and stores cold heat generated by expanding the refrigerant gas supplied to the expansion space when the displacer is reciprocated along the cylinder by the driving device. With materials,
The said drive device is a regenerator-type refrigerator provided with the bearing apparatus in any one of Claims 1-4.

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