JP5482352B2 - Shaft lock mechanism, torque calibration mechanism - Google Patents

Description

  The present invention relates to a shaft lock mechanism that locks a torque transmission shaft of a torque meter in a non-rotatable manner, and a torque calibration mechanism that includes the shaft lock mechanism.

  Conventionally, as a torque calibration device for periodically calibrating the accuracy error of a torque meter that can detect shaft torque, with one end of the torque transmission shaft of the torque meter locked, It is known that a calibration arm is attached and a weight is suspended from the calibration arm for calibration.

  As a shaft lock mechanism applied to such a torque calibration device, in Patent Document 1, a torque meter is placed on a mounting base and fixed, and one end side of the torque transmission shaft (specifically, the torque transmission shaft A pair of left and right cutting surfaces are formed on a part of the outer peripheral surface of the coupling provided on the one end side, and the inner surface of the shaft lock body that is U-shaped upside down inserted from above the shaft is cut. A configuration is disclosed in which the rotation of the torque transmission shaft is regulated by bringing the surface into close contact with no gap.

Japanese Patent No. 3843802

  By the way, since the torque calibration device performs calibration by hanging a weight on a calibration arm attached to the other end of the torque transmission shaft, accurate calibration cannot be performed unless the calibration arm is set horizontally during calibration. . However, in the aspect disclosed in Patent Literature 1, the inverted U-shaped shaft lock body whose inner surface is brought into close contact with the cutting surface without a gap is fixed to the mounting base with a bolt. If horizontal leveling is required, the mounting angle of the calibration arm relative to the shaft must be adjusted. At that time, the operator is forced to carry out the complicated work of adjusting the posture while holding the calibration arm that is long and relatively heavy, and fixing the calibration arm to the shaft in the horizontal position. It was. As a method of adjusting the mounting angle of the calibration arm with respect to the shaft itself, the level of the bolt attached to the calibration arm is once loosened by tightening the bolts inserted into a number of elongated holes formed on the same circumference of the calibration arm. It is possible to adjust the posture of the calibration arm while observing and fix the bolts again by tightening the bolts at the level where the calibration arm is horizontal. It is necessary to adjust the relationship between the two and the work becomes complicated.

  The present invention has been made paying attention to such a problem, and the main purpose thereof is an axis capable of appropriately regulating the rotation of the axis and easily performing horizontal leveling of the calibration arm. It is to provide a locking mechanism.

  That is, the present invention is attached to one end side of a torque transmission shaft of a torque meter capable of detecting shaft torque and can regulate the continuous rotation operation of this torque transmission shaft, and a calibration attached to the other end side of the torque transmission shaft. The present invention relates to a shaft lock mechanism that constitutes a torque calibration mechanism together with an arm.

  Here, the shaft lock mechanism of the present invention is any of these types, one that directly locks one end of the torque transmission shaft of the torque meter, or one that indirectly locks one end of the torque transmission shaft of the torque meter. May be. “Indirectly locking the torque transmission shaft” means “a shaft connected to the torque transmission shaft so as to be integrally rotatable, or a portion (flange portion, etc.) or a member (coupling, etc.) that can rotate integrally with the torque transmission shaft. ) ". Similarly, the calibration arm may be either directly attached to the other end side of the torque transmission shaft or indirectly attached to the other end side of the torque transmission shaft. “A calibration arm that is attached to the torque transmission shaft” means a calibration arm that is connected to a torque transmission shaft or a portion (flange portion, etc.) or a member (coupling, etc.) that can rotate integrally with the torque transmission shaft. Means.

  The shaft lock mechanism according to the present invention includes a shaft lock portion having a contact portion that can come into contact with the irregular shape portion formed on the outer peripheral surface of the torque transmission shaft, and a irregular shape portion by applying a predetermined weight load to the calibration arm. And an adjustment portion that can adjust the rotation angle of the torque transmission shaft and the posture of the calibration arm by moving the shaft lock portion while maintaining the contact state in which the contact portion is brought into contact.

  Here, examples of the “irregularly shaped portion” include a flat portion, a partial elliptical arc portion, or an uneven portion formed on the outer peripheral surface of the shaft. The shape of the contact portion of the shaft lock portion may be appropriately set according to the shape of the irregularly shaped portion. Further, the “movement” of the shaft lock portion may be either “rotational movement” or “parallel movement”, or may be “movement combining rotational movement and parallel movement”.

  With such a shaft lock mechanism, the rotation angle of the torque transmission shaft can be obtained by moving the shaft lock portion with the adjusting portion while maintaining the state where the one end side of the torque transmission shaft is locked so as not to be continuously rotatable with the shaft lock portion. And the posture of the calibration arm attached to the other end of this torque transmission shaft can be adjusted, so that the operator can adjust the posture while holding the calibration arm that is long and relatively heavy, There is no complicated work of fixing the calibration arm to the shaft at the position where the posture is reached.

  Further, in the shaft lock mechanism of the present invention, the adjustment portion is supported by a support portion that is not movable relative to the torque transmission shaft so as to be capable of screwing forward and backward, and a screw that can press a part of the shaft lock portion at the tip portion. If it is configured using an advancing / retracting member and the shaft lock portion is moved according to the screwing depth of the screw advancing / retreating member with respect to the support portion, the adjustment portion can be realized with a simple structure and low cost. Can be achieved.

  Further, the shaft lock mechanism of the present invention is provided with a protruding portion that is provided integrally or integrally with the shaft lock portion and protrudes in a direction away from the center of the shaft than the contact portion between the deformed portion of the shaft and the contact portion. And the shaft lock portion can be moved by pressing the protruding portion with the tip of the screw advance / retreat member. With such a configuration, the protruding portion that is a part of the shaft lock portion is pressed by the distal end portion of the screw advance / retreat member at a position farther from the center of the shaft than the contact portion between the deformed portion of the shaft and the contact portion. Therefore, according to the “principle principle”, the entire shaft lock part including the protruding part can be moved with a relatively small force, the leveling process of the calibration arm can be smoothly performed, and the work efficiency can be improved. Contribute to improvement. In particular, in this case, a small screw can be applied as the screwing advance / retreat member.

  As a preferred embodiment of the shaft lock portion, in a contact state where the contact portion is in contact with the irregularly shaped portion, a shaft in which the contact portion is formed in a region continuous with a pair of opening tip portions positioned at a position where the shaft can be sandwiched. Examples include a lock portion main body and a deformation prevention portion that prevents the distance between the opening tip portions from expanding in a contact state. With such a shaft lock part, the shaft lock part body can be deformed in the direction of expanding the opening tip parts when receiving a load (torque) from the shaft in a state where the continuous rotation of the shaft is restricted. However, such a situation can be avoided by the deformation preventing portion, and a good locking state of the shaft by the shaft locking portion can be maintained. Furthermore, if a protrusion that protrudes in the direction away from the shaft center (radial direction) is provided on the deformation prevention portion, the position at which the shaft lock portion is pressed by the tip of the screwing advance / retreat portion of the adjustment portion is determined. It can be set easily at a position farther from the center of the shaft than the contact point with the irregularly shaped portion, and is suitable.

  The torque calibration mechanism of the present invention includes the above-described shaft lock mechanism attached to one end of the torque transmission shaft of a torque meter capable of detecting shaft torque, and a calibration arm attached to the other end of the torque transmission shaft of the torque meter. It is characterized by having.

  If it is such, it will become the torque calibration mechanism which exhibits the various effect based on the axis | shaft lock mechanism mentioned above, and can perform the attitude | position adjustment of a calibration arm simply and appropriately.

  According to the present invention, by adopting a novel technical idea that the shaft lock part itself is moved in a state where the continuous rotation of the shaft is restricted by the shaft lock part, the rotation of the shaft locked to the shaft lock part is achieved. Since the posture of the calibration arm can be adjusted by adjusting the angle, the leveling process of the calibration arm can be easily performed while appropriately regulating the continuous rotation of the shaft.

The whole structure schematic diagram of the shaft torque calibration mechanism provided with the shaft lock mechanism which concerns on one Embodiment of this invention. The whole structure schematic diagram of the dynamo device applied in the embodiment. The whole figure of the calibration arm applied in the embodiment. The whole schematic diagram of the axis locking mechanism concerning the embodiment. The figure which looked at the axial lock mechanism which concerns on the same embodiment in the locked state along the axial direction. FIG. 5 is a view corresponding to FIG. 5 of the shaft locking mechanism according to the embodiment in the unlocked state. The a direction arrow directional view in FIG.

  As shown in FIG. 1, the shaft lock mechanism 1 according to an embodiment of the present invention is attached to one end of a torque transmission shaft T1 of a torque meter T capable of detecting shaft torque. A torque calibration mechanism X is configured with a calibration arm A attached to the other end of the shaft T1.

  Torque applied to the power transmission system test device Y (dynamo device) shown in FIG. 2 that can measure the output characteristics such as the generated torque of the motor or the power generation characteristics of the generator by using this torque calibration mechanism X Calibration (calibration) of the total T can be performed.

  A power transmission system test apparatus Y shown in FIG. 2 is arranged between a dynamometer D, an electric motor M which is a specimen arranged opposite to the dynamometer D at a predetermined interval, and the dynamometer D and the electric motor M. Torque meter T. In the present embodiment, an intermediate bearing unit U is disposed between the torque meter T and the electric motor M, and the dynamometer D, the electric motor M, and the intermediate bearing unit U are fixed on a common base B. In the power transmission system testing apparatus Y of the present embodiment, a single specimen (a motor M in the illustrated example) selected from a plurality of kinds of specimens (for example, an electric motor and a motor) is attached to a common specimen bracket K. It is set to be able to. One end side of the torque transmission shaft T1 of the torque meter T is connected to the rotating shaft D1 of the dynamometer D through the coupling Ca, and the other end side of the torque transmission shaft T1 is a flange portion F provided on one end side of the intermediate shaft U1. It is connected to. The rotating shaft M1 of the electric motor M is connected to a flange portion F provided on the other end side of the intermediate shaft U1 via a coupling Cb. With the above configuration, the rotating shaft D1 of the dynamometer D and the rotating shaft M1 of the electric motor M are concentrically connected via the torque meter T, the intermediate bearing unit U, the couplings Ca and Cb, and rotate integrally. It is possible.

  Here, the torque meter T has, for example, a strain generating portion (not shown) that generates strain due to torsion caused by the rotation of the torque transmission shaft T1, and the strain of the strain gauge attached to the strain generating portion is represented by an electric quantity. And the transmission torque is measured. Although FIG. 1 and FIG. 2 show a flange type torque meter T having flange portions at both ends, other types of torque meters T can be applied. When the specimen is the electric motor M, the dynamometer D becomes a “pseudo load”, and the torque meter T measures characteristics such as the transmission torque with respect to the rotational speed of the electric motor M as the specimen. When the specimen is a generator, the dynamometer D becomes a “pseudo motor”, and the power generation characteristics are measured by rotating the generator as the specimen.

  The torque meter T used in such a power transmission system testing apparatus Y requires periodic calibration (calibration) work in order to confirm accuracy. Such a calibration process can be performed by the torque calibration mechanism X.

  The torque calibration mechanism X according to the present embodiment includes a shaft lock mechanism 1 that fixes one end of the torque transmission shaft T1 so that continuous rotation is impossible, and a calibration arm A that is attached to the other end of the torque transmission shaft T1. The calibration is performed by suspending the weight W from the arm A.

  As shown in FIG. 1, the calibration arm A is connected to a flange portion F provided on the other end side of the intermediate shaft U <b> 1 released from the connection state with the rotating shaft M <b> 1 of the electric motor M in the power transmission system test device Y, for example. It can be installed. Since one end side of the intermediate shaft U1 is connected to the other end side of the torque transmission shaft T1 of the torque meter T via the flange portion F, the calibration arm A transmits the torque of the torque meter T via the intermediate shaft U1. It can be understood that it is indirectly attached to the other end side of the shaft T1. As shown in FIG. 3, the calibration arm A is a long one extending in a direction orthogonal to the longitudinal direction (stretching direction) of the torque transmission shaft T1, and has the other end of the torque transmission shaft T1 at the center in the width direction. For example, a fixing portion that can be fixed by a fastening member A1 such as a bolt is provided on the side, and suspension portions A2 that can suspend a weight W are provided at both ends in the longitudinal direction. In the present embodiment, a suspension rod (which may be a string) may be applied as the suspension A2 to suspend the weight W.

  The shaft lock mechanism 1 of the present embodiment fixes a rotating shaft D1 of a dynamometer D connected to one end side of a torque transmission shaft T1 of a torque meter T via a coupling Ca. Therefore, the shaft lock mechanism 1 can be regarded as one that indirectly fixes one end side of the torque transmission shaft T1 of the torque meter T.

  As shown in FIG. 4 and the like, a deformed portion D2 is formed on the outer peripheral surface of a portion of the rotating shaft D1 of the dynamometer D that can be directly locked by the shaft locking mechanism 1. In the present embodiment, as the irregularly shaped portion D2, flat portions parallel to each other formed so as to have a two-sided width in opposing regions (upper and lower regions in FIG. 4) of the outer peripheral surface of the rotation axis D1 of the dynamometer D are formed. Adopted. In the following description, a portion that is not a flat portion of the outer peripheral surface of the rotation axis D1 may be referred to as an arc portion D3.

  As shown in FIG. 4, the shaft lock mechanism 1 has a shaft lock portion 2 having a contact portion 21a that can come into contact with the deformed portion D2 of the rotary shaft D1, and a weight W having a predetermined weight suspended from the calibration arm A. The shaft lock portion 2 is moved while maintaining the contact state in which the contact portion 21a is brought into contact with the irregularly shaped portion D2, thereby rotating the rotation angle D1 of the dynamometer D (the rotation angle of the torque transmission shaft T1 of the torque meter T). ) And the adjustment unit 3 that can adjust the posture of the calibration arm A, and the base unit 4 that is directly fixed to the dynamometer D.

  The shaft lock portion 2 has an abutting portion 21a and a lock position (L) (see FIG. 5) that restricts the rotation of the rotary shaft D1, and an unlock position (U) that allows the rotation of the rotary shaft D1 ( The shaft lock portion main body 21 slidably movable between the shaft lock portion main body 21 and the shaft lock portion main body 21 at least in the lock position (L) is deformed by a load from the rotation shaft D1 (torque of the rotation shaft D1). And a deformation preventing portion 22 that prevents the deformation.

  The shaft lock portion main body 21 connects a pair of contact portions 21a spaced slightly wider than the two-surface width of the irregularly shaped portion D2 formed on the outer peripheral surface of the rotation shaft D1, and one end portions of these contact portions 21a. And a connecting portion 21b that has a substantially U-shape. The shaft lock portion main body 21 has a pair of opening tip portions 21c set in a region continuous with the contact portion 21a (see FIG. 5 and the like). In this embodiment, the inner method of the contact portions 21a is set slightly larger (for example, several mm) than the dimension between the deformed portions D2 of the rotation axis D1, and the contact portions 21a and the deformed portions D2 are mutually connected. In this case, a slight gap is formed between the contact portion 21a and the irregularly shaped portion D2. Accordingly, even when the shaft lock portion main body 21 is positioned at the lock position (L), the rotation shaft D1 is in a state of being rotatable by the gap. The shaft locking mechanism 1 according to the present embodiment is configured such that when the relative relationship between the contact portion 21a and the deformed portion D2 is not parallel, for example, when the rotation shaft D1 rotates by a predetermined angle (for example, ± several degrees), Each irregularly shaped portion D2 (specifically, a region in the vicinity of the boundary between the irregularly shaped portion D2 and the circular arc portion D3) simultaneously contacts the abutting portion 21a, and the shaft lock portion main body 21 continuously rotates the rotating shaft D1. Can be completely regulated (not shown). Further, the shaft lock portion main body 21 is provided with a handle 21d for moving the shaft lock portion main body 21 between the lock position (L) and the unlock position (U). In the present embodiment, a handle 21d is provided in the connecting portion 21b of the shaft lock portion main body 21.

  The deformation prevention part 22 is mainly composed of a frame-shaped deformation prevention part main body 22a capable of holding the shaft lock part main body 21 therein, and the lock position (L) of the shaft lock part main body 21 in the deformation prevention part main body 22a. The movement with the unlock position (U) is allowed. In the present embodiment, since the shaft lock portion main body 21 having a substantially U-shape is applied, the deformation preventing portion main body 22a is set in a substantially rectangular shape. The deformation preventing portion main body 22a is provided with a guide portion 22b for guiding the movement of the shaft lock portion main body 21 between the lock position (L) and the unlock position (U) (see FIG. 4; The part 22b is omitted). In the present embodiment, a guide portion 22b is provided on the surface of the deformation preventing portion main body 22a facing the torque meter T, and the shaft locking portion main body 21 is prevented from unexpectedly falling out of the deformation preventing portion 22 by the guide portion 22b. doing. The deformation prevention unit body 22a is provided with a stopper 22c that prevents the shaft lock unit body 21 moved from the unlock position (U) to the lock position (L) from moving further in the same direction. (See FIG. 5, which is omitted in FIG. 4). The shaft lock unit body 21 moved from the lock position (L) to the unlock position (U) is further restricted from moving in the same direction by contacting the deformation prevention unit body 22a itself. Further, a recess 22d that avoids interference with the rotation axis D1 is formed on the inner side surface of the deformation prevention unit main body 22a.

  Furthermore, in this embodiment, in the state (the internal space of the deformation prevention part main body 22a) surrounded by the deformation prevention part main body 22a in the state where the shaft lock mechanism 1 is attached to one end side of the dynamometer D (the shaft lock mechanism attachment state). Is set so that the rotation axis D1 of the dynamometer D disposed at a position closer to a predetermined direction (left direction in FIGS. 4 and 5) than the center of the inner space of the deformation prevention unit main body 22a. ing. And the deformation | transformation prevention part 22 is further spaced apart from the rotating shaft D1 of the dynamometer D in the part which is relatively separated from the rotating shaft D1 of the dynamometer D in the shaft locking mechanism attachment state in the deformation preventing part main body 22a. A projecting portion 22e that is projected in the direction (right direction in FIG. 4) is integrally or integrally provided. The deformation preventing unit 22 is set so as to be able to rotate within an angular range of, for example, about ± several degrees with the shaft lock unit main body 21 being held. In the present embodiment, long holes 22f that allow the rotation of the deformation preventing portion 22 are formed in the protruding portion 22e and the deformation preventing portion main body 22a, respectively, and a fastening member 23 that is individually inserted into each of the long holes 22f is a base that will be described later. Screwed into a screw hole 41 (see FIG. 7) formed in a part of the portion 4.

  The base portion 4 has a flat plate shape that allows the shaft lock portion main body 21 and the deformation prevention portion 22 to be backed up from the dynamometer D side, and avoids interference with the rotation axis D1 of the dynamometer D when the shaft lock mechanism is attached. An opening 42 is provided. The base portion 4 is fixed to the dynamometer D by a fixing member 43 such as a knock pin and a fastening member 44 such as a bolt (see FIG. 7). In the present embodiment, the shaft lock portion main body 21, the deformation prevention portion 22 and the base portion 4 are each formed in one plate shape or block shape, and if these portions are based on the shape and functional surface, the “lock plate (lock Block) ”,“ Rotating plate (rotating block) ”, and“ Fixed plate (fixed block) ”.

  The adjustment unit 3 includes a screw advance / retreat member 31 that can be screwed forward / backward between a pressing position where the tip part presses a part of the shaft lock part 2 and a non-pressing position separated from the shaft lock part 2. A support portion 32 that supports the advance / retreat member 31 so as to be able to advance and retreat is provided. In the present embodiment, a screw (hereinafter referred to as “angle adjusting screw 31”) is applied as the screwing advance / retreat member 31, and the protruding portion 22e of the shaft lock portion 2 can be pressed by the tip of the angle adjusting screw 31. It is configured. Specifically, the support portions 32 are respectively arranged at positions where the protruding portions 22e of the deformation preventing portion 22 can be sandwiched from above and below, and the tip ends of the angle adjusting screws 31 supported by the support portions 32 so as to be able to advance and retract. Thus, the upward and downward surfaces of the protrusion 22e can be pressed. Each support portion 32 has a screwing target portion 32a to which the angle adjusting screw 31 can be screwed. As the screwing target portion 32a, a nut (see FIG. 4) arranged so that the screw hole is communicated with a screw insertion hole 32b formed by penetrating the support portion 32 in the thickness direction (height direction), or the support portion 32. Screw holes formed so as to penetrate in the thickness direction (height direction).

  The shaft locking mechanism 1 according to the present embodiment adjusts the pressing force to the protruding portion 22e according to the screwing depth of each angle adjusting screw 31, thereby the deformation preventing portion 22 and the deformation preventing portion. The rotation angle of the rotation axis D1 of the dynamometer D that is the lock target shaft can be adjusted by rotating the shaft lock portion main body 21 held by the shaft 22, that is, rotating the entire shaft lock portion 2. In the present embodiment, one end portions (end portions on the dynamometer D side) of the pair of support portions 32 arranged at positions where the protruding portions 22e can be sandwiched are connected by the connection portions 33, and the support portions 32 and the connection portions 33 are blocked. The connecting portion 33 is fixed to the base portion 4 with an appropriate fastening member 34. In the present embodiment, the connection portion 33 is disposed on the back surface (the surface on the dynamometer D side) of the protruding portion 22e, and the connection portion 33 is fitted in the fitting recess 45 provided in the base portion 4. By fixing, a good fixed state is maintained and deformation of the support portion 32 is prevented.

  As shown in FIG. 2, the shaft lock mechanism 1 can be mounted even when the power transmission system test apparatus Y is normally used. That is, when the shaft lock mechanism 1 is mounted near the rotation axis D1 of the dynamometer D and the shaft lock portion 2 is set to the unlock position (U), the rotation shaft D1 of the dynamometer D can be continuously rotated. Thus, it rotates together with the intermediate shaft U1 and the torque transmission shaft T1 of the torque meter T according to the rotational speed of the electric motor M. Then, characteristics such as a transmission torque with respect to the rotational speed of the electric motor M can be measured by the torque meter T.

  On the other hand, when calibration of the shaft torque of the torque meter T is performed, the connection state between the intermediate shaft U1 and the motor M (specifically, the rotation shaft D1 of the motor M and the other end of the intermediate shaft U1 via the coupling Cb). The shaft lock portion main body 21 is moved from the unlock position (U) to the lock position (L). At this time, the operator applies an operation force to grip the handle 21d provided on the shaft lock portion 2 (or simply push it with a fingertip without picking it) and bring the shaft lock portion main body 21 closer to the rotation axis D1 side of the dynamometer D. do it. With this operating force, the shaft lock portion main body 21 smoothly moves from the unlock position (U) to the lock position (L) while being guided by the guide portion 22b. The shaft lock portion main body 21 that has moved from the unlock position (U) to the lock position (L) abuts against the stopper 22c, and further slide movement in the same direction is restricted.

  When the relationship between the contact portion 21a of the shaft lock portion main body 21 moved to the lock position (L) and the irregularly shaped portion D2 formed on the rotation shaft D1 of the dynamometer D is in a parallel state, as described above, A gap of about several mm is formed between the contact portion 21a and the irregularly shaped portion D2. When the calibration arm A is fixed to the other end side of the intermediate shaft U1, the intermediate shaft U1 connected to the rotating shaft D1 of the dynamometer D via the torque meter T so as to be integrally rotatable is different from the contact portion 21a. As a result, the calibration arm A can be tilted according to the rotation angle of the intermediate shaft U1. The shaft lock mechanism 1 according to the present embodiment has a pair of corner vicinity regions that are diagonally opposite to each other with differently-shaped portions D2 (specifically, boundary portions between the different-shaped portions D2 and the arc-shaped portions D3) as the rotating shaft D1 rotates. ) Is brought into a locked state in which the rotation operation of the rotation axis D1 in the same direction can be restricted when the contact portion 21a comes into pressure contact with the contact portion 21a.

  Since the torque calibration mechanism X performs calibration by suspending the weight W from the calibration arm A, it is necessary to adjust the calibration arm A to a horizontal posture.

  Therefore, the torque calibration mechanism X of the present embodiment is configured such that the shaft lock unit 2 in the state where the rotation shaft D1 of the shaft lock mechanism 1 is locked so as not to rotate is rotated by the adjustment unit 3 within a predetermined angle range. The rotation angle of the rotation axis D1 of D and the posture of the calibration arm A can be adjusted horizontally. Specifically, the operator only performs the work of adjusting the screwing depth of each angle adjusting screw 31 in the shaft lock mechanism 1, and the horizontal angle of the rotation axis D1 of the dynamometer D and the posture of the calibration arm A are horizontal. Can be adjusted. More specifically, an operation in which the operator further screwes into at least one of the angle adjusting screws 31 among the angle adjusting screws 31 supported in a state of being screwed to the screwing target portion 32a of the support portion 32. When a force is applied, the tip of the angle adjusting screw 31 that has passed through the support portion 32 hits the protruding portion 22e of the deformation preventing portion 22, and when an operation force for further screwing the angle adjusting screw 31 continues to be applied, the angle adjusting screw The protrusion 22e can be pressed by the tip of 31. Due to this pressing force, the protruding portion 22e and the deformation preventing portion main body 22a formed integrally or integrally with the protruding portion 22e move along the long hole 22f. In the present embodiment, the projecting portion 22e and the deformation preventing portion main body 22a, that is, the deformation preventing portion 22 are configured to rotate several degrees around the rotation axis D1 of the dynamometer D. As the deformation prevention unit 22 rotates, the shaft lock unit main body 21 held in the deformation prevention unit main body 22 a also rotates in the same direction by the rotation angle of the deformation prevention unit 22.

  In this way, the calibration arm A becomes horizontal in the entire shaft lock portion 2 in a contact state where the deformed portion D2 formed on the rotation shaft D1 of the dynamometer D is in contact with the contact portion 21a of the shaft lock portion main body 21. When the rotation axis is moved up to, the rotation axis D1 itself of the dynamometer D also rotates in the same direction. As a result, the torque transmission shaft T1 and the intermediate shaft U1 of the torque meter T that rotate integrally with the rotation shaft D1 also rotate in the same direction as the rotation shaft D1, and the calibration arm A fixed to the other end of the intermediate shaft U1 also rotates. Change the posture. Therefore, the operator can perform horizontal adjustment (horizontal leveling) of the calibration arm A simply by adjusting the screwing depth of the angle adjusting screw 31 as appropriate, and the weight W is suspended from the calibration arm A in a horizontal posture. Thus, the predetermined calibration work can be appropriately performed.

  Moreover, in the present embodiment, the deformation preventing portion 22 is provided with a protruding portion 22e that protrudes away from the center of the rotation axis D1 in the radial direction relative to the deformation preventing portion 22, and the protruding portion 22e is provided with an angle adjusting screw. Since the deformation preventing portion 22, the shaft lock portion main body 21, and the rotation shaft D <b> 1 are rotationally moved by being pressed by 31, the portion where the angle adjusting screw 31 hits the protruding portion 22 e, and the shaft lock portion 2 It is possible to ensure a sufficiently long distance between the contact portion 21a and the portion that contacts the irregularly shaped portion D2 of the rotating shaft D1, and, based on the lever principle, a relatively small angle adjusting screw 31 is used as a screwing advance / retreat member. It is possible to change the posture of the calibration arm A by rotating and moving the deformation preventing unit 22, the shaft lock unit main body 21, and the rotating shaft D1 with a light operating force. Furthermore, when the deformation preventing unit 22 and the shaft lock unit main body 21 are rotated in the same direction as the direction in which the torque from the rotation axis D1 is received, the posture adjustment processing of the calibration arm A can be performed with a lighter operating force.

  In particular, since the shaft lock mechanism 1 according to the present embodiment holds the shaft lock portion main body 21 in the frame-shaped deformation prevention portion 22, the shaft lock portion main body 21 is unexpectedly deformed by the torque from the rotating shaft D1. Since the protrusion 22e is provided in the deformation prevention portion 22, the position where the angle adjusting screw 31 hits the protrusion 22e is set at the position of the shaft lock portion 2. The contact portion 21a can be efficiently set at a position farther from the axis center of the rotation axis D1 than the position where the contact portion 21a contacts the deformed portion D2 of the rotation axis D1.

  In addition, this invention is not limited to embodiment mentioned above. For example, in the above-described embodiment, the flat portion (straight flat surface) formed on the outer peripheral surface of the shaft is illustrated as the irregular shape portion, but a partial elliptic arc portion is applied instead of or in addition to the flat portion. You can also And the shape and number of the contact part of an axis | shaft lock part should just be suitably set according to the number of the shape of a different shape part. Further, when a pair of flat portions are formed as irregularly shaped portions on the outer peripheral surface of the shaft, the pair of flat portions may be set in a relationship that is not parallel to each other, for example, a C shape or a substantially C shape, In this case, the pair of contact portions may be formed in a C shape or a substantially C shape in accordance with the shape of the flat portions.

  In the above-described embodiment, the mode in which the shaft lock unit is rotated by the adjustment unit has been exemplified. However, if the shaft lock unit is translated in a direction different from the longitudinal direction (extension direction) of the shaft, The shaft can be rotated by a vertical movement, a diagonal movement, or a parallel movement in any direction of the horizontal direction), and the calibration arm posture adjustment process can be performed appropriately.

  Further, as the shaft lock portion, a member mainly composed of a member corresponding to the shaft lock portion main body in the above-described embodiment, that is, a member that does not include the deformation prevention portion may be applied. In this case, it is preferable that a protruding portion is formed on a part of the shaft lock portion main body, and this protruding portion is pressed by the distal end portion of the screw advance / retreat member.

  Moreover, it can replace with a screw and can also apply a bolt as a screwing advance / retreat member of an adjustment part. In particular, when a threaded advance / retract member having a spherically formed tip that can be pressed against a part of the lock portion is applied, the screw advance / retreat member and the lock portion can be brought into point contact. Thus, it is possible to maintain a stable contact state and perform the calibration arm posture adjustment more smoothly and accurately.

  Further, the shaft lock unit body is not moved between the unlock position and the lock position, but is attached only to the position where the shaft to be locked is locked, that is, the dynamo device in the case of normal use as a dynamo device. You may remove it from

  Moreover, the aspect which locks the coupling and flange which are arrange | positioned at one end side to a torque transmission shaft by a shaft locking mechanism, and the aspect which directly locks a torque transmission shaft are employable. Further, the calibration arm may be one that can be directly attached to the other end side of the torque transmission shaft of the torque meter.

  The shaft lock mechanism may be attached to either the load side or the drive side of the torque transmission shaft, and the calibration arm may be attached to the side of the torque transmission shaft opposite to the side to which the shaft lock mechanism is attached.

  Furthermore, in the above-described embodiment, a mode in which a minute gap can be formed between the deformed portion of the shaft and the contact portion of the shaft lock portion is illustrated. However, the contact portion of the deformed portion of the shaft and the contact portion of the shaft lock portion. A small gap may not be formed between the two, and the two may contact each other without any gap.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Shaft lock mechanism 2 ... Shaft lock part 21 ... Shaft lock part main body 21a ... Contact part 22 ... Deformation prevention part 22e ... Projection part 3 ... Adjustment part 31 ... Screw advance / retreat member (screw for angle adjustment)
32 ... support part 4 ... base part A ... calibration arm D1 ... rotating shaft D2 ... irregularly shaped part T ... torque meter X ... torque calibration mechanism

Claims (5)

It is attached to one end of the torque transmission shaft of a torque meter capable of detecting shaft torque and can regulate continuous rotation of the shaft, and constitutes a torque calibration mechanism together with a calibration arm attached to the other end of the torque transmission shaft A shaft locking mechanism that
A shaft lock portion having a contact portion that can come into contact with the irregularly shaped portion formed on the outer peripheral surface of the torque transmission shaft;
While maintaining a contact state in which a load of a predetermined weight is applied to the calibration arm and the contact portion is brought into contact with the deformed portion, the shaft lock portion is moved to rotate the torque transmission shaft and the calibration arm. An axis lock mechanism comprising an adjustment unit capable of adjusting a posture. The adjustment portion is formed by using a screw advance / retreat member that is supported by a support portion that is not movable relative to the torque transmission shaft so as to be capable of screwing / retreating and that can press a part of the shaft lock portion at a tip portion. The shaft lock mechanism according to claim 1, wherein the shaft lock portion is moved according to a screwing depth of the screw advance / retreat member. A protrusion provided integrally or integrally with the shaft lock portion and protruding in a direction away from the center of the shaft with respect to a contact portion between the deformed portion of the shaft and the contact portion; The shaft lock mechanism according to claim 2, wherein the shaft lock portion is moved by being pressed by the screw advance / retreat member. The shaft lock portion is
A shaft lock portion main body in which the contact portion is formed in a region continuous with a pair of opening tip portions positioned at locations where the shaft can be sandwiched in the contact state;
The shaft locking mechanism according to claim 3, further comprising: a deformation preventing portion that prevents a distance between the opening front end portions from expanding in the contact state, and the protrusion is provided on the deformation preventing portion. The shaft lock mechanism according to claim 1, which is attached to one end side of a torque transmission shaft of a torque meter capable of detecting shaft torque, and a calibration arm attached to the other end side of the torque transmission shaft. Torque calibration mechanism characterized by that.

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