JPWO2018207624A1 - Rod assembly, nut tightening jig, and supercharger - Google Patents

Abstract

The rod assembly includes a turnbuckle including a first adjustment hole provided at the first end and a second adjustment hole provided at the second end, and a first adjustment screwed into the first adjustment hole of the turnbuckle. A first rod including a first connecting end connected to an external first member on the opposite side of the end and the first adjusting end; and a second adjusting end to be screwed into the second adjusting hole of the turnbuckle And a second rod including a second connecting end connected to an external second member on the opposite side of the second adjusting end, a first nut fitted to the first adjusting end of the first rod, A second nut fitted to the second adjustment end of the second rod. Each of the first nut and the second nut includes a conical surface formed around the central axis on the side opposite to the end surface that contacts the turnbuckle, and the conical surface includes a plurality of recesses at different circumferential positions. Is provided.

Description

  The present disclosure relates to a rod assembly including a turnbuckle, a nut tightening jig for tightening a nut of the rod assembly, and a supercharger including the rod assembly.

  As shown in Patent Documents 1 and 2, a rod that is provided in a supercharger and that can be adjusted in length is known. The rod described in Patent Document 1 is used in an actuator of a waste gate valve, and includes an adjuster for adjusting the length of the rod. The rod described in Patent Document 2 is also used for an actuator of a waste gate valve, and includes a connecting rod and an adjusting rod. A connecting rod is inserted into the screw hole of the adjusting rod. This rod has a lock nut that locks these adjustment positions, and a cylindrical protective sleeve that covers the lock nut. The lock nut is fixed in place so that the rod cannot be easily readjusted.

JP 59-153920 A JP 58-162726 A

  By providing the rod assembly with a turnbuckle, the length of the rod assembly can be adjusted. For example, in the actuator provided in the variable capacity mechanism of the supercharger, the length of the rod assembly can be adjusted in order to adjust the characteristics of the actuator. That is, the user can change the performance or exhaust gas characteristics by adjusting the length of the rod assembly. For example, after the installer has adjusted the length of the rod assembly, a person other than the installer may readjust the length (or tamper with the rod assembly). In the rod described in Patent Document 2, since the protective sleeve is provided, the number of parts increases.

  The present disclosure describes a rod assembly and a supercharger that makes it impossible to readjust the length of the rod assembly once adjusted without increasing the number of parts. The present disclosure also describes a nut tightening jig that allows the length to be adjusted for such a rod assembly.

  A rod assembly according to an aspect of the present disclosure is a turnbuckle extending along a central axis, and includes a first adjustment hole provided at a first end along the central axis and having an internal thread, and a central axis. A turnbuckle including a second adjustment hole provided at the second end along which a female screw is formed, and a second buckle disposed along the central axis, wherein the male screw is formed and screwed into the first adjustment hole of the turnbuckle. A first rod including a first adjusting end and a first connecting end connected to an external first member on the opposite side of the first adjusting end; and a male rod formed along the central axis. A second rod including a second adjustment end that is screwed into the second adjustment hole of the turnbuckle and a second connection end connected to the external second member on the opposite side of the second adjustment end And a turnbuckle while being fitted to the first adjustment end of the first rod A first nut that contacts the first end surface of the first end, and a second nut that is fitted to the second adjustment end of the second rod and contacts the second end surface of the second end of the turnbuckle. The first nut and the second nut each include a conical surface formed around the central axis on the side opposite to the end surface that contacts the turnbuckle, and the conical surface includes a plurality of depressions at different circumferential positions. Is provided.

  One aspect of the present disclosure makes it impossible to readjust the length of the rod assembly without increasing the number of parts.

FIG. 1 is a cross-sectional view illustrating a supercharger according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing the supercharger of FIG. FIG. 3 is a view showing the rod assembly in FIG. 2. 4A is a perspective view of the nut in FIG. 3 viewed from the conical surface side, and FIG. 4B is a perspective view of the nut in FIG. 3 viewed from the flat end surface side. FIG. 5A is a perspective view of the nut tightening jig according to the embodiment as viewed from the prism side, and FIG. 5B is a perspective view of the nut tightening jig as viewed from the nut housing portion side. FIG. 6 is a diagram for explaining a nut tightening method using a nut tightening jig. FIG. 7 is a perspective view of a nut according to another embodiment of the present disclosure as viewed from the conical surface side. FIG. 8 is a perspective view of a nut tightening jig according to another embodiment as viewed from the nut housing portion side. FIG. 9 is an outline view showing a supercharger according to another embodiment of the present disclosure.

  A rod assembly according to an aspect of the present disclosure is a turnbuckle extending along a central axis, and includes a first adjustment hole provided at a first end along the central axis and having an internal thread, and a central axis. A turnbuckle including a second adjustment hole provided at the second end along which a female screw is formed, and a second buckle disposed along the central axis, wherein the male screw is formed and screwed into the first adjustment hole of the turnbuckle. A first rod including a first adjusting end and a first connecting end connected to an external first member on the opposite side of the first adjusting end; and a male rod formed along the central axis. A second rod including a second adjustment end that is screwed into the second adjustment hole of the turnbuckle and a second connection end connected to the external second member on the opposite side of the second adjustment end And a turnbuckle while being fitted to the first adjustment end of the first rod A first nut that contacts the first end surface of the first end, and a second nut that is fitted to the second adjustment end of the second rod and contacts the second end surface of the second end of the turnbuckle. The first nut and the second nut each include a conical surface formed around the central axis on the side opposite to the end surface that contacts the turnbuckle, and the conical surface includes a plurality of depressions at different circumferential positions. Is provided.

  In this rod assembly, the first rod is screwed into the first end of the turnbuckle, and the second rod is screwed into the second end. As the turnbuckle is rotated relative to the first rod and the second rod, the overall length of the rod assembly changes. Since each of the first nut and the second nut is provided with a conical surface on the side opposite to the turnbuckle, it is difficult to grip (clamp) the first nut and the second nut. By using a dedicated jig having projections that engage with a plurality of recesses provided on the conical surface, and inserting the jig into the conical surface and rotating it, the first nut and the second nut Can be rotated. In this rod assembly, after the rod assembly is adjusted to a certain length, the first nut and the second nut are rotated using a dedicated jig, and each member is fixed. Thereby, the length which connects an external 1st and 2nd member is adjusted. On the other hand, in the situation where there is no dedicated jig as described above, it is impossible to rotate the first nut and the second nut. Therefore, the turnbuckle cannot rotate with respect to the first and second rods. By using a specially shaped nut having a conical surface and a recess, it is impossible to readjust the length of the rod assembly without increasing the number of parts. For example, after the installer has adjusted the length of the rod assembly, it is possible to prevent a person other than the installer from re-adjusting the length (or tampering with the rod assembly).

  In some embodiments of the rod assembly, each of the plurality of recesses in the first nut or the second nut is a hole that extends in the direction of the central axis. In this case, by providing a long protrusion on a dedicated jig and inserting the protrusion into the hole, the jig can be reliably engaged with the first or second nut. The length of the part contacting in the circumferential direction can be increased, and a sufficient rotational force (torque) can be applied to the first or second nut.

  In some aspects of the rod assembly, the number of recesses in the first nut or the second nut is an odd number. In this case, the plurality of indentations may be arranged at positions deviating from the diameter (that is, the maximum width portion) in the first or second nut. Therefore, it is more difficult to grip (clamp) the first nut or the second nut.

  As another aspect of the present disclosure, a first rod is provided in each of a first adjustment hole provided in a first end portion of a turnbuckle extending along a central axis and a second adjustment hole provided in a second end portion of the turnbuckle. A nut tightening jig for tightening at least one of the nuts, wherein the first rod and the second rod are screwed and the first rod and the second rod are respectively fixed by nuts. The nut includes a conical surface formed around the central axis on the side opposite to the end surface that abuts the turnbuckle, and the conical surface is provided with a plurality of depressions at different circumferential positions. A nut housing portion including an inner peripheral surface facing the conical surface, and two or more engageable with at least two of the plurality of recess portions provided on the inner peripheral surface of the nut housing portion. And projections, nut tightening jig may be provided with a, a prismatic part provided concentrically with respect to the nut with projecting on the side opposite to the nut in the direction of the central axis.

  This nut tightening jig is used for at least one of nuts for fixing the first rod and the second rod to the turnbuckle. Since the nut has a conical surface on the side opposite to the turnbuckle, it is difficult to grasp (clamp) the nut. However, the conical surface is provided with a plurality of depressions. The nut can be rotated by engaging two or more protrusions of the nut tightening jig with two or more hollow portions and rotating the prismatic portion with a rotary tool or the like. On the other hand, in the situation where there is no nut tightening jig, it is impossible to rotate the nut. According to this nut tightening jig, the length can be adjusted even for a rod assembly including a nut having a special shape including a conical surface and a recess.

  In some embodiments of the nut tightening jig, each of the plurality of indentations in the nut is a hole extending in the direction of the central axis, and each of the two or more protrusions extends in the direction of the central axis. It is a pin that can be inserted into the part. In this case, the nut tightening jig can be reliably engaged with the nut by inserting the pin of the nut tightening jig into the hole of the nut. The length of the part contacting in the circumferential direction can be increased, and a sufficient rotational force (torque) can be applied to the nut.

  In some embodiments of the nut tightening jig, the inner peripheral surface of the nut housing portion has a conical shape that can come into contact with the conical surface of the nut. In this case, the nut tightening jig can be securely fitted to the nut.

  In some embodiments of the nut tightening jig, a notch having a width larger than the diameter of at least one of the first rod and the second rod penetrates outward from the nut housing portion along the radial direction of the central axis. The part is formed. In this case, a nut tightening jig can be attached and rotated from the radial direction of the first or second rod. Such accessibility from the radial direction can improve workability when adjusting the length of the rod assembly.

  In some embodiments of the nut tightening jig, the nut tightening jig has a halved structure that is divided into two by a plane including the central axis. In this case, a nut tightening jig can be attached and rotated from the radial direction of the first or second rod. Such accessibility from the radial direction can improve workability when adjusting the length of the rod assembly.

  In some embodiments of the nut tightening jig, the prism portion is provided with a flange portion projecting to the outer peripheral side. In this case, the nut tightening jig can be pressed against the turnbuckle side in the direction of the central axis by pressing a rotating tool or the like against the collar portion. Thereby, a nut fastening jig | tool can be reliably fitted to a nut. Since the pin can be sufficiently inserted into the hole, a sufficient rotational force (torque) can be applied to the nut.

  As another aspect of the present disclosure, a supercharger including a variable displacement mechanism including any of the rod assemblies described above may be provided. According to this supercharger, since the readjustment of the length of the rod assembly is impossible, the effect of preventing mischief is exhibited. In the variable capacity mechanism, the length of the rod assembly is important in terms of performance and exhaust gas characteristics. A turbocharger in which the length of the rod assembly once adjusted cannot be readjusted has high reliability.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

  A variable capacity supercharger 1 shown in FIG. 1 is applied to, for example, an internal combustion engine of a ship or a vehicle. As shown in FIG. 1, the variable displacement supercharger 1 includes a turbine 2 and a compressor 3. The turbine 2 includes a turbine housing 4 and a turbine impeller 6 housed in the turbine housing 4. The turbine housing 4 has a scroll channel 16 extending in the circumferential direction around the turbine impeller 6. The compressor 3 includes a compressor housing 5 and a compressor impeller 7 housed in the compressor housing 5. The compressor housing 5 has a scroll passage 17 extending in the circumferential direction around the compressor impeller 7.

  The turbine impeller 6 is provided at one end of the rotating shaft 14, and the compressor impeller 7 is provided at the other end of the rotating shaft 14. A bearing housing 13 is provided between the turbine housing 4 and the compressor housing 5. The rotating shaft 14 is rotatably supported by the bearing housing 13 via a bearing 15, and the rotating shaft 14, the turbine impeller 6 and the compressor impeller 7 rotate around the rotation axis H as an integral rotating body 12.

  The turbine housing 4 is provided with an exhaust gas inlet 8 (see FIG. 2) and an exhaust gas outlet 10. Exhaust gas discharged from an internal combustion engine (not shown) flows into the turbine housing 4 through the exhaust gas inlet, flows into the turbine impeller 6 through the scroll passage 16, and rotates the turbine impeller 6. Thereafter, the exhaust gas flows out of the turbine housing 4 through the exhaust gas outlet 10.

  The compressor housing 5 is provided with a suction port 9 and a discharge port (not shown). When the turbine impeller 6 rotates as described above, the compressor impeller 7 rotates via the rotating shaft 14. The rotating compressor wheel 7 sucks external air through the suction port 9, compresses it, and discharges it from the discharge port through the scroll flow path 17. The compressed air discharged from the discharge port is supplied to the aforementioned internal combustion engine.

  Subsequently, the turbine 2 will be further described. The turbine 2 is a variable capacity turbine, and a plurality of variable nozzle blades 23 are provided in a gas inflow passage 21 that connects the scroll passage 16 and the turbine impeller 6. A plurality of variable nozzle blades 23 are arranged on a circumference around the rotation axis H, and each variable nozzle blade 23 rotates around a rotation axis parallel to the rotation axis H. The gas inflow path 21 allows the gas flowing into the turbine impeller 6 from the scroll flow path 16 to pass through. As the variable nozzle blade 23 rotates as described above, the cross-sectional area (throat area) of the gas flow path is optimally adjusted according to the flow rate of the exhaust gas introduced into the turbine 2.

  The turbine 2 includes a variable nozzle unit (variable capacity mechanism) 25 as a drive mechanism for rotating the variable nozzle blade 23 as described above. The variable nozzle unit 25 includes a plurality of variable nozzle blades 23 and a first nozzle ring 31 and a second nozzle ring 32 that sandwich the variable nozzle blade 23 in the axial direction.

  An annular plate-shaped support ring 41 is fixed to the compressor side of the first nozzle ring 31, and a ring-shaped drive ring support member 43 is fixed to the compressor side of the support ring 41. The first nozzle ring 31, the second nozzle ring 32, the support ring 41, and the drive ring support member 43 are connected to each other by a connection pin 35. By attaching the drive ring 28 to the drive ring support member 43, the drive ring 28 is supported so as to be rotatable around the rotation axis H.

  Next, the drive mechanism of the variable nozzle unit 25 will be described with reference to FIG. As shown in FIG. 2, a motor 102 and a rod assembly 100 are provided outside the turbine housing 4 and the compressor housing 5 as a drive mechanism for the variable nozzle unit 25. The motor 102 is fixed to the bracket 101 attached to the compressor 3. The output shaft of the motor 102 is connected to the drive ring 28 in the turbine housing 4 via the first link member 46, the rod assembly 100, the second link member 47, and the drive shaft 48. When the driving force from the motor 102 is input to the driving ring 28, the driving ring 28 rotates about the rotation axis H, and each variable nozzle blade 23 rotates accordingly. Note that the drive source is not limited to the motor 102. The drive source may be, for example, an air-actuated actuator that includes a diaphragm.

  The length of the rod assembly 100 is adjusted in advance by the installer so that the variable nozzle blade 23 rotates by a predetermined angle according to the rotation angle of the output shaft of the motor 102. The rotation angle of the variable nozzle blade 23 is important from the viewpoint of the performance of the turbine 2 and the exhaust gas characteristics. In the rod assembly 100, the length cannot be readjusted with a simple configuration. That is, the rod assembly 100 is configured such that even if something other than the installer tries to readjust the length of the rod assembly 100 for the purpose of mischief or the like, such readjustment will fail. ing. The rod assembly 100 is a so-called tamper resistant rod.

  The rod assembly 100 will be described in detail with reference to FIG. The rod assembly 100 has a central axis A. The rod assembly 100 includes a turnbuckle 50 extending along the central axis A, and a first rod 60 and a second rod 70 provided on both sides of the central axis A of the turnbuckle 50. Each material of the first rod 60 and the second rod 70 is not particularly limited. Known metal materials can be used.

  The turnbuckle 50 has a cylindrical shape. A first adjustment hole 51 b is provided along the central axis A in the first end 51 on the first rod 60 side of the turnbuckle 50. A second adjustment hole 52b is provided along the central axis A at the second end 52 of the turnbuckle 50 on the second rod 70 side. The first adjustment hole 51b and the second adjustment hole 52b communicate, for example, and penetrate the turnbuckle 50 in the direction of the central axis A. Female screws are formed in the first adjustment hole 51b and the second adjustment hole 52b, respectively. One female thread is a right-hand thread and the other female thread is a left-hand thread. The material of the turnbuckle 50 is not particularly limited. Known metal materials can be used. The external shapes of the first end 51 and the second end 52 are, for example, cylindrical.

  An intermediate portion 53 is provided between the first end portion 51 and the second end portion 52. The outer shape of the intermediate portion 53 has a hexagonal column shape, for example. The intermediate portion 53 is configured to be rotated around the central axis A by a rotary tool such as a spanner.

  The first rod 60 is disposed on the motor 102 side (see FIG. 2). The first rod 60 is disposed along the central axis A. The first rod 60 is screwed into the first end 51 of the turnbuckle 50, and the first link member 46 (the first external member) on the opposite side of the first adjustment end 65. A first connecting end portion 63 to be connected. The first adjustment end 65 is formed with a male screw corresponding to the female screw formed in the first adjustment hole 51b. A first pin 91 is provided at the first connection end 63. The first pin 91 is a connecting pin on the drive source side, and is inserted through a through hole formed in the first link member 46.

  The second rod 70 is disposed on the drive shaft 48 side (see FIG. 2). The second rod 70 is disposed along the central axis A. The second rod 70 is screwed into the second end 52 of the turnbuckle 50, and the second adjustment end 75 is screwed into the second link member 47 (an external second member) on the opposite side of the second adjustment end 75. And a second connecting end portion 73 to be connected. The second adjustment end 75 is formed with a male screw corresponding to the female screw formed in the second adjustment hole 52b. A second pin 92 is provided at the second connection end 73. The second pin 92 is a connecting pin on the drive ring 28 side, and is inserted through a through hole formed in the second link member 47.

  As shown in FIG. 4, a first nut N <b> 1 is fitted to the first adjustment end 65 of the first rod 60. The first nut N <b> 1 screwed into the male screw of the first adjustment end portion 65 is tightened until it abuts on the first end surface 51 a of the first end portion 51 after the length of the rod assembly 100 is adjusted. On the other hand, a second nut N <b> 2 is fitted on the second adjustment end 75 of the second rod 70. The second nut N <b> 2 screwed into the male screw of the second adjustment end 75 is tightened until it abuts on the second end surface 52 a of the second end 52 after the length of the rod assembly 100 is adjusted. In this way, the entire length of the rod assembly 100 is maintained constant.

  As a tamper-proof function, the first nut N1 and the second nut N2 of the rod assembly 100 have a special shape. The first nut N1 and the second nut N2, for example, differ only in the direction of the female screw, and may have the same configuration in other portions. Hereinafter, the first nut N1 and the second nut N2 are collectively referred to simply as a nut N.

  The nut N will be described with reference to FIGS. 3, 4 (a), and 4 (b). The material of the nut N is not particularly limited. The nut N is made of, for example, chromium molybdenum steel (SCM).

  As shown in FIGS. 4A and 4B, the nut N is formed with a through hole 86 that penetrates in the direction of the axis. The diameter of the through hole 86 may be constant in the direction of the axis. The first adjustment end 65 of the first rod 60 or the second adjustment end 75 of the second rod 70 is inserted through the through hole 86 (see FIG. 3). The axis of the nut N coincides with the central axis A of the turnbuckle 50. The nut N is in contact with the first end surface 51a or the second end surface 52a of the turnbuckle 50 in a tightened state.

  The nut N includes an annular contact end surface 81 that contacts the first end surface 51a or the second end surface 52a, and an annular free end surface 82 that is located on the opposite side of the contact end surface 81 in the axial direction. Each of the contact end surface 81 and the free end surface 82 is, for example, a flat surface perpendicular to the axis. The free end face 82 may not be provided.

  The nut N includes a conical surface 83 provided between the contact end surface 81 and the free end surface 82. The conical surface 83 is formed around the central axis A. The axis of the conical surface 83 coincides with the axis of the nut N. The conical surface 83 is formed on the free end surface 82 side. That is, the conical surface 83 is formed on the side opposite to the contact end surface 81. On the free end face 82 side of the nut N, no other part protrudes radially outward of the conical face 83. The conical surface 83 is exposed. The diameter of the conical surface 83 increases as it approaches the turnbuckle 50 side, that is, the contact end surface 81. As a result, the contact end surface 81 has a larger area than the free end surface 82. Note that the inclination angle of the generatrix of the conical surface 83 with respect to the central axis A may be constant or may change in the middle. The inclination angle of the generatrix of the conical surface 83 with respect to the central axis A may be 20 degrees or more, 25 degrees or more, or 30 degrees or more. The inclination angle of the generatrix of the conical surface 83 with respect to the central axis A may be less than 20 degrees. From the viewpoint of making it difficult to grip (clamp) from the outside, the inclination angle of the generatrix of the conical surface 83 with respect to the central axis A is preferably 20 degrees or more.

  An annular outer peripheral surface 85 may be formed between the conical surface 83 and the contact end surface 81. The outer peripheral surface 85 is formed at an end portion on the abutting end surface 81 side, and extends in parallel with the central axis A, for example. The outer peripheral surface 85 has the largest diameter among the outer peripheral surfaces (including the conical surface 83) of the nut N with respect to the central axis A. The outer peripheral surface 85 of the nut N is the same as or smaller than the respective diameters of the first end 51 and the second end 52 of the turnbuckle 50. Therefore, as shown in FIG. 3, with the nut N attached, the outer peripheral surface 85 is flush with the first end 51 and the second end 52, or the first end 51 and the first end The two end portions 52 are recessed inward in the radial direction.

  The conical surface 83 is provided with a plurality of hole portions (recess portions) 84 at different positions in the circumferential direction. For example, five holes 84 are provided at equal intervals in the circumferential direction. Each hole 84 extends in the direction of the central axis A (parallel to the central axis A), and has a certain diameter in the direction of the central axis A, for example. Each hole 84 has a cylindrical shape parallel to each other. Each hole 84 penetrates from the conical surface 83 toward the contact end surface 81, for example. The opening on the conical surface 83 side of the hole portion 84 is, for example, an ellipse that is inclined with respect to the central axis A (see FIG. 4A). The opening on the contact end face 81 side of the hole 84 is, for example, a circular shape perpendicular to the central axis A (see FIG. 4B). Instead of the hole portion 84 penetrating from the conical surface 83 to the contact end surface 81, a recess portion having a bottom surface that opens to the conical surface 83 but does not penetrate the contact end surface 81 may be formed.

  Since the conical surface 83 is exposed and only the opening of the hole 84 is formed in the conical surface 83, it is difficult to grip (clamp) the nut N from the outside. Even if the nut N can be gripped (clamped), the tool or the like slides on the conical surface 83, and the nut N cannot be rotated.

  The number of holes 84 is, for example, five, but is not limited to five. An odd number of holes 84 is advantageous from the viewpoint of preventing tampering. The number of holes 84 is based on the diameter of the hole 84, the size and strength of the nut N, the torque required to rotate the nut N, the strength of the nut tightening jig 200 for rotating the nut N, and the like. And can be determined appropriately.

  Next, the nut tightening jig 200 will be described with reference to FIGS. 5 (a), 5 (b), and 6. FIG. When the nut N is tightened (or loosened) with respect to the rod assembly 100 of the present embodiment, the nut tightening jig 200 is used. The nut tightening jig 200 is a dedicated jig for rotating the nut N having a special shape. The material of the nut fastening jig 200 is not particularly limited. The nut tightening jig 200 is made of, for example, chromium molybdenum steel (SCM).

  As shown in FIGS. 5A and 5B, the nut tightening jig 200 has a rod housing portion 206 extending along the direction of the central axis A and a nut housing communicating with the rod housing portion 206. A portion 202 is formed. The rod housing portion 206 and the nut housing portion 202 are combined to penetrate the nut fastening jig 200 in the direction of the central axis A. When the nut tightening jig 200 is used, the first adjusting end 65 of the first rod 60 or the second adjusting end 75 of the second rod 70 is fitted into the rod housing portion 206 (see FIG. 6). ).

  The nut housing portion 202 includes an inner peripheral surface 203 having a size and shape corresponding to the conical surface 83 of the nut N. The inner peripheral surface 203 faces the conical surface 83 of the nut N when the nut tightening jig 200 is used. The inner peripheral surface 203 has, for example, a conical shape that can come into contact with the conical surface 83 of the nut N. More specifically, the inner peripheral surface 203 has a conical shape in which a part in the circumferential direction is cut out corresponding to a cutout portion 207 described later.

  As shown in FIG. 5B, a plurality of pins (projections) 204 are provided on the inner peripheral surface 203 of the nut housing portion 202. For example, four pins 204 are arranged at a predetermined interval in the circumferential direction. The base of each pin 204 is integrated with a horseshoe-shaped step surface 205 formed between the inner peripheral surface 203 and the rod housing portion 206. Each pin 204 extends in the direction of the central axis A (parallel to the central axis A), and has a constant diameter in the direction of the central axis A, for example. Each pin 204 has a cylindrical shape parallel to each other. The diameter of each pin 204 is smaller than the diameter of each hole 84.

  Each pin 204 is disposed so as to be inserted into each hole 84 of the nut N. That is, the above-described predetermined interval is equal to the interval between the center lines of the adjacent holes 84 when the center line of the pin 204 is used as a reference. A tapered tip end portion 204 a for facilitating entry of the pin 204 into the hole portion 84 may be provided at the tip end of the pin 204.

  The nut tightening jig 200 is formed with a notch 207 penetrating from the nut housing portion 202 toward the outside along the radial direction of the central axis A. The width of the notch 207 (the smallest part of the size in the direction perpendicular to the central axis A) is the first adjustment end 65 of the first rod 60 and the second adjustment end 75 of the second rod 70, respectively. Larger than the diameter of

  Thereby, the notch 207 allows the first adjustment end 65 of the first rod 60 and the second adjustment end 75 of the second rod 70 to pass from the outside to the rod accommodating portion 206 or from the rod accommodating portion 206 to the outside. (See FIG. 6).

  By forming the notches 207, the number of pins 204 is smaller than the number of holes 84. More specifically, when the nut tightening jig 200 is used, four pins 204 are inserted into the four holes 84 out of the five holes 84, and a pin is inserted into one hole 84. 204 is not inserted. (At this time, the notch 207 faces one hole 84.)

  The nut tightening jig 200 includes a prism portion 201 that protrudes on the opposite side of the nut N in the direction of the central axis A. The rectangular column part 201 is provided concentrically with respect to the nut N and the nut accommodating part 202. The prism portion 201 has, for example, a shape in which a part of a regular hexagonal column is cut out. More specifically, two of the six side surfaces are cut out and one corner of the six corners is missing corresponding to the above-described cutout 207. The prism portion 201 includes a U-shaped end portion 201 a on the side opposite to the nut N. The nut housing portion 202 ends in the middle of the prism portion 201 on the central axis A.

  On the turnbuckle 50 side (see FIG. 3) of the prism portion 201, a flange portion 208 is provided to project to the outer peripheral side. The flange 208 has a predetermined thickness in the direction of the central axis A and extends perpendicular to the central axis A. The flange 208 has an annular shape with a part in the circumferential direction cut away. The diameter of the collar portion 208 is larger than the diameter of each of the first end portion 51 and the second end portion 52 of the turnbuckle 50.

  In the rod assembly 100 of the present embodiment, the first rod 60 is screwed into the first end 51 of the turnbuckle 50 and the second rod 70 is screwed into the second end 52. When the turnbuckle 50 is rotated with respect to the first rod 60 and the second rod 70, the overall length of the rod assembly 100 changes. Since each of the first nut N1 and the second nut N2 is provided with a conical surface 83 on the opposite side to the turnbuckle 50, it is difficult to grip (clamp) the first nut N1 and the second nut N2. It has become. Using a nut fastening jig 200 having a pin 204 inserted into and engaged with a plurality of holes 84 provided in the conical surface 83, the nut fastening jig 200 is fitted into the conical surface 83 and rotated. Thus, the first nut N1 and the second nut N2 can be rotated. In this rod assembly 100, after the rod assembly 100 is adjusted to a certain length, the first nut N1 and the second nut N2 are rotated using the nut tightening jig 200, and each member is fixed. The Thereby, the length which connects the external 1st link member 46 and the 2nd link member 47 is adjusted. On the other hand, in the situation where there is no nut tightening jig 200, the clamping force cannot be transmitted to the first nut N1 and the second nut N2, and the tool slides. Therefore, it is impossible to rotate the first nut N1 and the second nut N2. Therefore, the turnbuckle 50 cannot rotate with respect to the first rod 60 and the second rod 70. By using the nut N having a special shape including the conical surface 83 and the hole 84, the length of the rod assembly 100 cannot be readjusted without increasing the number of parts. For example, after the contractor adjusts the length of the rod assembly 100, a person other than the contractor readjusts the length of the rod assembly 100 (or tampers with the rod assembly 100). Things can be prevented.

  The nut N can be rotated by inserting and engaging the four pins 204 of the nut tightening jig 200 with respect to the four holes 84 and rotating the prism portion 201 with a rotary tool such as a spanner. . According to the nut tightening jig 200, the length of the rod assembly 100 including the nut N having a special shape including the conical surface 83 and the hole 84 can be adjusted.

  By inserting the pin 204 of the nut tightening jig 200 into the hole 84 of the nut N, the nut tightening jig 200 can be reliably engaged with the nut N. The length of the portion in contact with the circumferential direction (rotational direction) can be increased, and a sufficient rotational force (torque) can be applied to the nut N.

  The five holes 84 are arranged at positions deviating from the diameter (that is, the maximum width portion) in the first nut N1 or the second nut N2. Therefore, it is more difficult to firmly hold (clamp) the first nut N1 or the second nut N2.

  In the nut tightening jig 200, the inner peripheral surface 203 of the nut receiving portion 202 has a conical shape that can come into contact with the conical surface 83 of the nut N, so that the nut tightening jig 200 is securely fitted to the nut N. Can be made. At this time, the step surface 205 of the nut tightening jig 200 may abut on the free end surface 82 of the nut N.

  According to the nut tightening jig 200 in which the notch 207 is formed, the nut tightening jig 200 is attached and rotated from the radial direction of the first rod 60 or the second rod 70 as shown in FIG. Can do. Such accessibility from the radial direction can improve workability when the length of the rod assembly 100 is adjusted. For example, when the first rod 60 and the second rod 70 are connected to the first link member 46 and the second link member 47, the nut tightening jig 200 is attached to or removed from the rod assembly 100. can do. This is also effective from the viewpoint of preventing mischief. There is no problem in accessing a rotary tool such as a spanner to the nut tightening jig 200.

  Since the prism portion 201 is provided with the flange portion 208, the nut tightening jig 200 can be pressed against the turnbuckle 50 in the direction of the central axis A by pressing a rotary tool or the like against the flange portion 208. Thereby, the nut fastening jig 200 can be reliably fitted to the nut N. Since the pin 204 can be sufficiently inserted into the hole portion 84, a sufficient rotational force (torque) can be applied to the nut N.

  Furthermore, since the outer peripheral surface 85 is flush with the first end portion 51 and the second end portion 52, or is recessed more radially inward than the first end portion 51 and the second end portion 52, It is also impossible to grip (clamp) the outer peripheral surface 85 of the nut N from the outside in the radial direction.

  Since the hole portion 84 is provided in the conical surface 83, the radial size can be reduced. Unlike the present embodiment, a form in which a hole opening in a flat surface perpendicular to the central axis A is also conceivable, but in that case, the entire nut is increased in size and is easily gripped from the outside in the direction. The disadvantage can arise.

  Further, unlike the present embodiment, a conical nut is joined to a hexagonal nut, and a form in which this joint is cut after tightening is also conceivable. However, when this form is applied to the rod assembly 100, Unnecessary hexagon nuts remain on the first rod 60 or the second rod 70.

  According to the nut N and the nut tightening jig 200 of the present embodiment, the above inconvenience does not occur, and readjustment (mischief) can be appropriately prevented.

  According to the variable capacity supercharger 1, since the readjustment of the length of the rod assembly 100 is impossible, an effect of preventing mischief is achieved. In the variable nozzle unit 25, the length of the rod assembly 100 is important in terms of performance and exhaust gas characteristics. The supercharger in which the length of the rod assembly 100 once adjusted cannot be readjusted has high reliability.

  A nut NA and a nut tightening jig 200A according to another embodiment of the present disclosure will be described with reference to FIGS. As shown in FIG. 7, the difference between the nut NA and the nut N of the previous embodiment is that the three recesses 84A that do not penetrate in the direction of the central axis A are opposite to the contact end surface 81. The end face on the side is not a flat surface but is uneven. Each recess 84A has a shape corresponding to a part of a column that is parallel to each other and extends in the direction of the central axis A. A plurality of tooth portions 89 are provided on the end surface opposite to the contact end surface 81. For example, six tooth portions 89 are provided at equal intervals in the circumferential direction. Each tooth portion 89 includes a steep slope 89a directed rearward and a gentle slope 89b directed forward based on the rotation direction when the nut NA is tightened. The steep slope 89a is inclined at a larger angle than the gentle slope 89b with reference to a plane perpendicular to the central axis A.

  As shown in FIG. 8, the nut tightening jig 200A is different from the nut tightening jig 200 of the previous embodiment in that three pins 204A extending in the direction of the central axis A are provided, and the nut This is that a plurality of engaging portions 209 are provided in the accommodating portion 202. The three cylindrical pins 204A can be inserted into and engaged with the recess 84A. For example, six engaging portions 209 are provided at equal intervals in the circumferential direction. Each engaging portion 209 includes an engaging wall surface 209a directed forward and a sliding wall surface 209b directed rearward with reference to the rotation direction when the nut NA is tightened. The engagement wall surface 209a is inclined with a larger angle than the sliding wall surface 209b with reference to a plane perpendicular to the central axis A.

  When the nut tightening jig 200 </ b> A is used, the engaging portion 209 of the nut tightening jig 200 </ b> A enters a trough formed between the tooth portions 89 of the nut NA. When the nut tightening jig 200A is rotated in the rotation direction at the time of tightening the nut NA, the engagement wall surface 209a of the engagement portion 209 is engaged with the steep slope 89a of the tooth portion 89, and a rotational force ( Torque). However, when the nut tightening jig 200A is rotated in the opposite direction to loosen the nut NA, the sliding wall surface 209b of the engaging portion 209 slides in a state of being in contact with the gentle slope 89b of the tooth portion 89, A sufficient rotational force (torque) is not applied to the nut NA. Even with the nut NA having such a special shape, the length of the rod assembly 100 cannot be readjusted without increasing the number of parts. For example, after the contractor adjusts the length of the rod assembly 100, a person other than the contractor readjusts the length of the rod assembly 100 (or tampers with the rod assembly 100). Things can be prevented. Further, according to the nut tightening jig 200A, it is possible to adjust the length of the rod assembly 100 including the nut NA having a special shape including the conical surface 83 and the recessed portion 84A.

  Further, in the nut tightening jig 200A, the pin 204A can be easily molded because the rigidity required for the pin 204A is low. That is, the nut tightening jig 200A has a shape with improved productivity. The recessed portion 84A of the nut NA is used for tightening (for example, during adjustment) with a relatively small torque. Therefore, the rigidity of the pin 204A may be relatively small.

  With reference to FIG. 9, a variable capacity supercharger 1A according to another embodiment will be described. The difference between the rod assembly 100A and the rod assembly 100 of the above embodiment is that the first rod 60 is not provided with a pin, and the first rod 60 is connected to an air-actuated actuator 150 including a diaphragm. It is. The turbine housing 4 of the variable capacity turbocharger 1A is provided with a bypass passage 111 that allows the exhaust gas inlet 8 and the exhaust gas outlet 10 to communicate with each other, and a valve body 112 that can open and close the opening of the bypass passage 111. ing. That is, the variable capacity supercharger 1A has a waste gate valve mechanism. The second rod 70 of the rod assembly 100A is connected to the valve body 112 via the second pin 92, the link member 128, the stem 121, and other members (such as a valve mounting plate). In such a variable capacity supercharger 1 </ b> A, the same operation and effect as the variable capacity supercharger 1 can be achieved.

  As mentioned above, although embodiment of this indication was described, this invention is not limited to the said embodiment.

  The number of depressions may be three, or may be seven or more. The number of depressions may be an even number such as two, four, six or more. A hollow part or a hole part may extend in the circumferential direction (or chord direction). The recess or hole may be a lateral hole extending in the circumferential direction.

  In the 1st nut and the 2nd nut, the number and shape of a hole (recessed part) may differ. In that case, a separate nut fastening jig may be used for each of the first nut and the second nut.

  The nut tightening jig may not be provided with a notch. If the first nut N1 and / or the second nut N2 are tightened in a state where the first pin 91 and the second pin 92 are not connected to the external first member and the second member, the nut tightening jig is tightened. It can later be removed from the end of the rod assembly. In that case, the structure which can remove the 1st pin 91 and / or the 2nd pin 92 may be employ | adopted so that the 1st rod 60 and / or the 2nd rod 70 may be extracted from a nut clamping jig | tool. However, a configuration in which the first pin 91 and / or the second pin 92 are not provided may be employed.

  The nut tightening jig may have a halved structure that is divided into two by a plane including the central axis A. In this case, the nut tightening jig divided from the radial direction of the first rod 60 or the second rod 70 can be attached so as to be aligned, and the nut can be rotated. Such accessibility from the radial direction can improve workability when adjusting the length of the rod assembly. For example, when the first rod 60 and the second rod 70 are connected to the first link member 46 and the second link member 47, the nut tightening jig 200 is attached to or removed from the rod assembly 100. can do. This is also effective from the viewpoint of preventing mischief.

  The inner peripheral surface of the nut tightening jig does not have to be conical. The inner peripheral surface of the nut tightening jig may have, for example, an uneven shape that partially contacts the conical surface of the nut.

  The shape of the recess formed in the nut is not limited to a cylindrical hole. Other structures may be employed as long as the protrusion of the nut tightening jig can be engaged (concave and recessed) with the recess and a rotational force can be applied to the nut.

  After adjusting the length of the rod assembly 100, the recess or hole may be closed. In that case, readjustment cannot be performed even if a nut tightening jig is used.

  Some aspects of the present disclosure make it impossible to readjust the length of the rod assembly without increasing the number of parts. A nut tightening jig capable of adjusting the length is also provided for a rod assembly including a nut having a special shape including a conical surface and a recessed portion. A reliable turbocharger is provided in which the length of the rod assembly once adjusted cannot be readjusted.

DESCRIPTION OF SYMBOLS 1, 1A Variable capacity type | mold supercharger 50 Turn buckle 51 1st end part 51a 1st end surface 51b 1st adjustment hole 52 2nd end part 52a 2nd end surface 52b 2nd adjustment hole 60 1st rod 63 1st connection end part 65 First adjustment end 70 Second rod 73 Second connection end 75 Second adjustment end 81 Abutting end face (end face)
83 Conical surface 84 Hole (dent)
84A hollow part 89 tooth part 100, 100A rod assembly 200, 200A nut tightening jig 201 prismatic part 202 nut housing part 203 inner peripheral surface 204, 204A pin (protrusion)
207 Notch 209 Engagement part A Center axis N Nut N1 First nut N2 Second nut

Claims (10)

A turnbuckle extending along a central axis, a first adjustment hole provided at a first end along the central axis and formed with a female screw, and a female screw provided at a second end along the central axis A turnbuckle including a second adjustment hole formed with
A first adjusting end disposed along the central axis and having a male screw formed and screwed into the first adjusting hole of the turnbuckle; and an external first member opposite to the first adjusting end. A first rod including a first connecting end to be connected;
A second adjustment end disposed along the central axis and having a male screw formed and screwed into the second adjustment hole of the turnbuckle; and an external second member opposite to the second adjustment end. A second rod including a second connecting end to be connected;
A first nut fitted into the first adjustment end of the first rod and in contact with a first end surface of the first end of the turnbuckle;
A second nut fitted into the second adjustment end of the second rod and abutting against a second end surface of the second end of the turnbuckle;
Each of the first nut and the second nut includes a conical surface formed around the central axis on a side opposite to an end surface that contacts the turnbuckle, and the conical surface has different circumferential positions. A rod assembly provided with a plurality of depressions.   2. The rod assembly according to claim 1, wherein each of the plurality of depressions in the first nut or the second nut is a hole that extends in a direction of the central axis.   The rod assembly according to claim 1 or 2, wherein the number of the plurality of depressions in the first nut or the second nut is an odd number. A first rod and a second rod are screwed into a first adjustment hole provided at the first end of the turnbuckle extending along the central axis and a second adjustment hole provided at the second end of the turnbuckle, respectively. A nut tightening jig for tightening at least one of the nuts, wherein the first rod and the second rod are each used for a rod assembly fixed by a nut;
The nut includes a conical surface formed around the central axis on the side opposite to the end surface that contacts the turnbuckle, and the conical surface is provided with a plurality of recesses at different circumferential positions. And
A nut housing portion including an inner peripheral surface facing the conical surface of the nut;
Two or more protrusions provided on the inner peripheral surface of the nut housing portion and capable of engaging with at least two of the plurality of depressions, respectively.
A nut tightening jig comprising: a prismatic portion protruding in a direction opposite to the nut in the direction of the central axis and provided concentrically with the nut. Each of the plurality of depressions in the nut is a hole extending in the direction of the central axis,
The nut tightening jig according to claim 4, wherein each of the two or more protrusions is a pin that extends in a direction of the central axis and can be inserted into the hole.   The nut tightening jig according to claim 4 or 5, wherein the inner peripheral surface of the nut housing portion has a conical shape capable of contacting the conical surface of the nut.   The notch part which penetrates toward the exterior from the nut accommodating part along the radial direction of the central axis, and has a width larger than the diameter of at least one of the first rod and the second rod is formed. The nut tightening jig as described in any one of 4-6.   The nut tightening jig according to any one of claims 4 to 6, which has a halved structure that is divided into two by a plane including the central axis.   The nut tightening jig according to any one of claims 4 to 8, wherein the prism portion is provided with a flange portion projecting outward.   The supercharger provided with the variable capacity mechanism containing the rod assembly as described in any one of Claims 1-3.

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