JP5434627B2 - Rotation detector mounting mechanism - Google Patents

Description

  The present invention relates to an attachment mechanism for attaching two types of rotation detectors to a rotation shaft.

  The speed of the motor provided in the chassis dynamometer is detected by an encoder.

  This encoder includes an incremental encoder that can detect at high speed rotation by counting the pulse output of the pulse pickup, and an absolute encoder that can detect position with high accuracy and high resolution by generating multi-digit code output. There is.

  Among these, for example, Patent Document 1 discloses a method related to attachment of an incremental encoder to a chassis dynamometer. Previously, speed detection was performed only with an incremental encoder. However, when high accuracy and high resolution are required at a stop or at a low speed, the incremental encoder alone cannot meet the demand.

  For this reason, an encoder that uses an absolute encoder at low speeds and an incremental encoder at medium and high speeds has been proposed. For example, Patent Document 2 discloses a combination of these two types of encoders.

JP 2001-289721 A. Unexamined-Japanese-Patent No. 2006-313073.

  However, since the thing of patent document 2 has made two types of rotation detectors into an integrated type, when one of the rotation detectors becomes defective, only one of them cannot be replaced. Further, attaching two types of rotation detectors has a problem that the structure is complicated and the cost is increased.

  The present invention has been made based on the above-described problems, and it is an object of the present invention to provide a rotation detector mounting mechanism that is reduced in cost while having a compact and simple structure.

  In order to solve the above problems, the present invention includes a relay shaft that is attached to a rotating shaft and rotates together with the rotating shaft, and a rotating portion that rotates together with the relay shaft. A first rotation detector that detects the number of rotations of the rotation shaft and a fixing member that engages with the relay shaft are in close contact with the rotating portion of the first rotation detector, and the relay shaft and the first rotation detection A rotation transmitting member that rotates together with the rotating portion of the container, and a rotating portion that rotates with the protruding portion by inserting a protrusion provided on the rotation transmitting member, and the rotation shaft based on the rotation of the rotation transmitting member A second rotation detector that detects the number of rotations, a holding member that holds the first rotation detector and suppresses rotation of a portion other than the rotating portion in the second rotation detector, A support member that supports the holding member. Characterized in that was.

  A relay shaft that is attached to the rotation shaft and that rotates together with the rotation shaft; and a rotation portion that rotates together with the relay shaft, and detects a rotation speed of the rotation shaft based on rotation of the relay shaft. A rotation detector and a rotation transmitting member that is brought into close contact with the rotating portion of the first rotation detector by a fixing member that engages with the relay shaft and rotates together with the relay shaft and the rotating portion of the first rotation detector; A second rotation detector that has a rotating part that is inserted into a protrusion provided on the relay shaft and rotates together with the protrusion, and detects the number of rotations of the rotating shaft based on the rotation of the relay shaft; A holding member that holds the first rotation detector and suppresses rotation of a portion other than the rotating portion in the second rotation detector; and a support member that supports the holding member. It is characterized by.

  Further, the relay shaft is attached to the rotating shaft of the chassis dynamometer.

  According to the above configuration, although two types of rotation detectors are attached, the structure can be made compact, simple, and inexpensive, and it is not necessary to use an encoder that integrates the two types. Since two kinds of encoders can be used, the cost can be reduced. Further, the first rotation detector is held by the holding member, the rotation of the second rotation detector excluding the rotating portion of the second rotation detector is suppressed by the holding member, and the holding member is supported by the support member. Thus, even when a frame for fixing the rotation detector cannot be provided around the rotation shaft, two types of rotation detectors can be fixed. Therefore, the present invention is particularly useful when there is no frame that can fix two types of rotation detectors near the rotation axis.

  Further, an insulating layer is provided on the relay shaft and the rotation transmission member, and the fixing member is an insulating member.

  According to the above configuration, the relay shaft is provided with the insulating layer. Thereby, the shaft current generated in the rotating shaft does not flow to the first rotation detector via the relay shaft. Furthermore, the rotation transmission member is provided with an insulating layer, and the fixing member is an insulating member. As a result, no axial current flows through the rotation transmitting member, and therefore no axial current flows through the second rotation detector. Therefore, the first rotation detector and the second rotation detector can detect rotation without being affected by the axial current.

  In addition, an insulating layer is provided on the relay shaft.

  According to the above configuration, the relay shaft is provided with the insulating layer. Thereby, the shaft current generated in the rotating shaft does not flow to the first and second rotation detectors via the relay shaft. Therefore, the first rotation detector and the second rotation detector can detect rotation without being affected by the axial current.

  The first rotation detector is provided in a direction orthogonal to the relay shaft, and the rotation transmitting member, the holding member, and the second rotation detector are provided in the axial direction of the relay shaft. It is characterized by.

  According to the above configuration, no mounting member or the like is provided in the outer peripheral portion of the first rotation detector, that is, in the direction orthogonal to the relay shaft, so that space saving is achieved in the direction orthogonal to the relay shaft. Can do.

  Further, the holding member is formed in a disc shape, and a hole is formed in the center of the disc, and the first rotation detector is held at an outer peripheral end portion of one end face of the disc. The second rotation detector is attached to the inner peripheral end of the other end face of the disk.

  According to the above configuration, the first rotation detector and the second rotation detector are held or attached to different end surfaces of the disc-shaped holding member. That is, since the first and second rotation detectors are held or attached only by the disk-shaped holding member, space saving in the axial direction can be achieved.

  According to the first, third, and seventh aspects of the invention, two types of rotation detectors can be attached, but a compact, simple, and inexpensive structure can be provided, and it is necessary to use an encoder that integrates the two types. However, since it is possible to use two existing individual encoders, the cost can be reduced. In addition, even when the shaft has a much larger diameter than the diameter of the rotating shaft, such as a roller of a chassis dynamometer, and there is no frame for fixing the rotation detector around the rotating shaft, The rotation detector can be fixed. Therefore, the present invention is particularly useful when there is no frame that can fix two types of rotation detectors near the rotation axis.

  According to the invention of claim 2, the relay shaft is provided with the insulating layer. Thereby, the shaft current generated in the rotating shaft does not flow to the first rotation detector via the relay shaft. Furthermore, the rotation transmission member is provided with an insulating layer, and the fixing member is an insulating member. As a result, no axial current flows through the rotation transmitting member, and therefore no axial current flows through the second rotation detector. Therefore, the first rotation detector and the second rotation detector can detect rotation without being affected by the axial current.

  According to the invention of claim 4, the relay shaft is provided with the insulating layer. Thereby, the shaft current generated in the rotating shaft does not flow to the first and second rotation detectors via the relay shaft. Therefore, the first rotation detector and the second rotation detector can detect rotation without being affected by the axial current.

  According to the fifth aspect of the present invention, no mounting member or the like is provided in the outer peripheral portion of the first rotation detector, that is, in the direction orthogonal to the relay shaft, so that space saving is achieved in the direction orthogonal to the relay shaft. Can be achieved.

  According to invention of Claim 6, the 1st rotation detector and the 2nd rotation detector are hold | maintained or attached to the mutually different end surface of the holding member made into the disk shape. That is, since the first and second rotation detectors are held or attached only by the disk-shaped holding member, space saving in the axial direction can be achieved.

FIG. 3 is an overall view of a rotation detector mounting mechanism according to the first embodiment. 1 is a configuration diagram of a relay shaft in Embodiment 1. FIG. The block diagram of the attachment in Example 1. FIG. Configuration diagram of spacer in Examples 1 and 2 FIG. 6 is an overall view of a rotation detector mounting mechanism according to a second embodiment. FIG. 6 is a configuration diagram of a relay shaft in Embodiment 2. The block diagram of the stopper in Example 2. FIG.

  Hereinafter, a rotation detector mounting mechanism according to an embodiment of the present invention will be described in detail with reference to the drawings.

  First, a mounting example of the present invention will be described. The attachment mechanism of the rotation detector of the present invention is attached to a rotating shaft, and when it is attached to a chassis dynamometer, the attachment form is the same as that of Patent Document 1. FIG. 2A of Patent Document 1 is an example of attachment, and the attachment mechanism of the rotation detector of the present invention is attached at the place of the flange 14.

  FIG. 1 is a front cross-sectional view of a rotation detector mounting mechanism in the present embodiment. First, an outline of the configuration in FIG. 1 will be described.

  A relay shaft 10 is attached to a roller shaft (not shown), and an incremental encoder 102 configured in a cylindrical shape is provided on the outer peripheral surface of the relay shaft 10.

  A spacer 30 is attached to the fixed portion 102b of the incremental encoder 102, and an absolute encoder 104 is attached to the left end surface of the spacer 30 (holding member).

  The attachment 20 (rotation transmission member) that contacts the rotating portion 102a of the incremental encoder 102 is attached to the rotating portion 102a by using the relay shaft 10, the incremental encoder 102, and the insulating bolt 107 (fixing member). The legs of the insulation bolt 107 are not shown.

  The small-diameter protrusion 27 of the attachment 20 is inserted into the rotating part of the absolute encoder 104. The spacer 30 is supported via the frame 110, the rod 113, the bellows couplings 114a and 114b, the mounting plates 116 and 118, the mounting base 122, and the like.

  The incremental encoder 102 corresponds to the first rotation detector, and the absolute encoder 104 corresponds to the second rotation detector.

  Here, details of each part in FIG. 1 will be described with reference to the drawings. Thereafter, details of the overall configuration will be described with reference to FIG. 1 again.

  The relay shaft 10 will be described with reference to FIG. FIG. 2A is a front view of the relay shaft 10, and FIG. 2B is a left side view of the relay shaft 10.

  The relay shaft 10 attached to the roller shaft has a columnar shape, and four screw holes 11a to 11d penetrate in the axial direction on the same circumference at a predetermined distance in the radial direction from the central axis of the relay shaft 10. And it is drilled at equal intervals.

  Further, the thickness of the cylinder of the relay shaft 10 is not constant, and there are two types, a first cylinder shaft 12 having a large diameter and a second cylinder shaft 13 having a small diameter inserted into the incremental encoder 102.

  Further, an insulating layer 15 a is provided on the annular portion of the left end surface of the first cylindrical shaft 12 that is in contact with the outside, and an insulating layer 15 b is provided on the outer peripheral surface of the second cylindrical shaft 13.

  Further, the screw holes 16a to 16d are formed at equal intervals on a circumference slightly far from the distance from the central axis of the relay shaft 10 to the screw holes 11a to 11d.

  The attachment 20 will be described with reference to FIG. FIG. 3A is a front sectional view of the attachment 20, and FIG. 3B is a left side view of the attachment 20.

  The attachment 20 attached to the rotating part 102a of the incremental encoder 102 includes a disk part 21 and a protrusion part 22 protruding vertically from a substantially central plane of the disk part 21.

  The disc portion 21 includes a large-diameter portion 21a that is in contact with the protruding portion 22, and a small-diameter portion 21b that is formed on a plane opposite to the protruding portion 22 of the large-diameter portion 21a and has a smaller diameter than the large-diameter portion 21a. ing.

  An insulating layer 24a having a predetermined radial width is provided on the peripheral edge of the large-diameter portion 21a on the plane opposite to the protruding portion 22. An insulating layer 24b is provided on the outer peripheral surface of the small diameter portion 21b.

  The screw hole 25 into which the insulating bolt 107 is inserted is drilled from the outer peripheral surface of the small diameter portion 21a parallel to the central axis of the disc portion 21. Further, the four screw holes 25 are drilled at equal intervals on the circumference centered on the central axis of the disc portion 21.

  The protrusion 22 includes a large-diameter protrusion 26 and a small-diameter protrusion 27 that is inserted into the rotating portion of the absolute encoder 104. The small-diameter protrusion 27 has a column whose length is longer than that of the large-diameter protrusion 26, and the diameter of the cylinder is smaller than the diameter of the cylinder of the large-diameter protrusion 26.

  One end face of the large-diameter protrusion 26 is fixed to the left end face of the disc portion 21, and one end face of the small-diameter protrusion 27 is fixed to the other end face. The central axis of the large-diameter protrusion 26 and the small-diameter protrusion 27 is collinear with the central axis of the disk portion 21.

  The spacer 30 is demonstrated using FIG. 4A is a front sectional view of the spacer 30, FIG. 4B is a detailed view of a portion A in FIG. 4A, and FIG. 4C is a left side view of the spacer 30. is there.

  The spacer 30 attached to the fixed portion 102b of the incremental encoder 102 is formed in a disc shape, and a hole 31 into which the small-diameter projection portion 27 of the projection portion 22 is inserted is provided at the center. Are formed with steps 32a to 32d. Of these, the step between the step 32b and the step 32c is larger than the other steps.

  Screw holes 33a to 33d are formed through the step 32a so that the screws are screwed from the left end surface toward the right end surface. The screw holes 33a to 33d are for fixing the absolute encoder 104, and are formed at equal intervals on the same circumference on the step 32a with the center of the hole 31 as the center.

  Further, screw holes 34a to 34d are formed through the step 32c so that bolts are screwed from the left end surface toward the right end surface. The screw holes 34 a to 34 d are holes on the step 32 c into which the bolt 103 of FIG. 1 is inserted, and are drilled through the same circumference on the step 32 c centering on the center of the hole 31. The straight line connecting the screw holes 34a and 34b, the straight line connecting the screw holes 34c and 34d, and the straight line connecting the screw holes 33a and 33c are parallel to each other.

  The straight line connecting the screw holes 34a and 34b is inside the screw hole 33b, and the straight line connecting the screw holes 34c and 34d is inside the screw hole 33d.

  Further, screw holes 35a to 35d having a predetermined depth are formed on the outer peripheral side of the screw holes 34a to 34d. The screw holes 35a to 35d are holes into which the bolts 111 of FIG. 1 are inserted. Further, the centers of the screw holes 35a to 35d are on the step 32d, and are formed at equal intervals on the same circumference with the center of the hole 31 as the center.

  As shown in FIG. 4B, a semicircular groove 36 is formed at the end of the step 32c side on the surface connecting the steps 32c and 32d.

  The screw holes 34a to 34d and 35a to 35d do not correspond to the positions of the screw holes in FIGS. 4A and 4C for convenience of explanation, but the actual mounting state is as shown in FIG.

  Returning to FIG. 1, the details of the rotation detector mounting mechanism in the present embodiment will be described.

  The relay shaft 10 attached to the roller shaft is fixed to the roller shaft by inserting a bolt 101 into the screw holes 11a to 11d and screwing the bolt 101 into the roller shaft. The incremental encoder 102 is a penetrating encoder, and detects the rotation of the relay shaft 10 by, for example, an optical method, a magnetic method, or the like.

  The rotating part 102a, which is the inner part of the dotted line of the incremental encoder 102, rotates together with the relay shaft 10 as will be described later, and the outer fixing part 102b does not rotate. In the case of the optical type, a slit portion of a slit disk, a light source, and a light receiving element that rotate together with the rotating portion 102a are disposed inside the fixed portion 102b. The rotation of the relay shaft 10 is detected by detecting the rotation of the slit disk by the light source and the light receiving element.

  There may be a gap between the insulating layer 15a and the incremental encoder 102. Even in that case, since the relay shaft 10 and the attachment 20 are connected by the insulating bolt 107, the attachment 20 can be rotated while suppressing the swing in the direction of the rotation axis.

  The spacer 30 attached to the fixing portion 102b of the incremental encoder 102 is fixed to the fixing portion 102b when the bolt 103 is inserted into the screw holes 34a to 34d and screwed into the fixing portion 102b. In this case, the step 32c formed on the outer peripheral side of the right end surface of the spacer 30 and the fixing portion 102b are in close contact with each other.

  The absolute encoder 104 attached to the spacer 30 is attached to the inner peripheral end of the left end surface of the spacer 30 by attaching a screw (not shown) of the attachment piece 105 to the screw holes 33a to 33d. By attaching in this way, rotation of the part except the rotation part (part to which the slit disk 104a is attached) of the absolute encoder 104 is suppressed.

  In the attachment 20 that contacts the rotating portion 102a of the incremental encoder 102, the insulating bolt 107 is inserted into the screw hole 25 of the attachment 20 and screwed into the screw holes 16a to 16d of the relay shaft 10, and the insulating layer 24a is the left end surface of the rotating portion 102a. It is fixed by sticking to the convex part. Further, the insulating layer 24a is in close contact with the rotating portion 102a and the rotation of the relay shaft 10 is transmitted to the rotating portion 102a, so that the rotating portion 102a rotates together with the relay shaft 10 and the attachment 20.

  Further, the small-diameter protrusion 27 of the attachment 20 is inserted into the rotating portion of the absolute encoder 104 and is fixed to the rotating portion with a screw 106. As described above, the attachment 20 rotates together with the relay shaft 10, and the absolute encoder 104 detects this rotation. That is, the slit disk 104a of the absolute encoder 104 rotates with the rotating portion of the absolute encoder 104, and the rotation is detected by a light source and a light receiving element (not shown).

  The frame 110 attached to the outer peripheral side of the left end surface of the spacer 30 is fixed by screwing the bolt 111 into the screw holes 35a to 35d. Further, the frame 110 is provided with a pipe 112 through which an electric cable connected to the absolute encoder 104 is passed.

  At the center of the left end surface of the frame 110, one end of a bellows coupling 114b is fixed by a bolt 115. One end of a rod 113 is attached to the other end of the bellows coupling 114b, and one end of a bellows coupling 114a is attached to the other end of the rod 113. The other end of the bellows coupling 114 a is attached to the upper part of the attachment plate 116 with a bolt 117.

  A mounting plate 118 is attached to the lower portion of the mounting plate 116 with bolts 119. The mounting plate 118 is attached to the mounting base 122 with bolts 121 through vibration-proof rubber 120. The mounting base 122 is attached and fixed to a support column (not shown).

  The frame 110, the rod 113, the bellows couplings 114a and 114b, the bolts 115, 117, 119, and 121, the mounting plates 116 and 118, the anti-vibration rubber 120, and the mounting base 122 correspond to support members.

  As described above, the relay shaft 10 passes through the incremental encoder 102, and the attachment 20 is attached to the rotating portion 102 a by the relay shaft 10, the incremental encoder 102 and the insulating bolt 107. The spacer 30 is fixed to the incremental encoder 102, and the absolute encoder 104 is fixed to the spacer 30. As a result, the present invention can be constructed in a compact, simple and inexpensive structure while attaching two types of rotation detectors, and it is not necessary to use an integral encoder, and two existing individual types can be used. Since an encoder can be used, cost reduction can be achieved.

  In addition, the incremental encoder 102 is held by the spacer 30, the absolute encoder 104 is attached to the spacer 30, and the spacer 30 is supported by the frame 110 and the like. Therefore, even when the diameter of the rotating shaft is much larger than the diameter of the rotating shaft, such as a roller of a chassis dynamometer, and the frame for fixing the incremental encoder 102 cannot be provided around the rotating shaft, the incremental encoder 102 And the absolute encoder 104 can be fixed. Therefore, the present invention is particularly useful when there is no frame that can fix two types of rotation detectors near the rotation axis.

  In addition, since no attachment member or the like is provided at the outer peripheral portion of the incremental encoder 102, that is, in the direction orthogonal to the relay shaft 10, space saving can be achieved in the direction orthogonal to the relay shaft 10.

  Further, the incremental encoder 102 and the absolute encoder 104 are held or attached to different end surfaces of the disc-shaped spacer 30. That is, since the incremental encoder 102 and the absolute encoder 104 are held or attached only by the disk-shaped spacer 30, space saving in the axial direction can be achieved.

  Further, since the insulating layers 15 a and 15 b are provided on the relay shaft 10, the shaft current generated in the roller shaft does not flow through the incremental encoder 102. Further, the shaft current does not flow through the absolute encoder 104 due to the insulating bolt 107 and the insulating layers 24a and 24b for fixing the attachment 20. Therefore, the incremental encoder 102 and the absolute encoder 104 can detect rotation without being affected by the shaft current.

  FIG. 5 is a front cross-sectional view of the rotation detector mounting mechanism in the present embodiment.

  This embodiment differs from the first embodiment in the portions of the relay shaft 40 and the stopper 50. The relay shaft 40 attached to the roller shaft is greatly different from the relay shaft 10 in that a portion corresponding to the protrusion 21 of the attachment 20 in FIG. 1 is added. The stopper 50 in contact with the rotating portion 102a of the incremental encoder 102 is provided in place of the attachment 20 in order to transmit the rotation of the relay shaft 40 to the rotating portion 102a of the incremental encoder 102.

  First, the relay shaft 40 and the stopper 50 will be described, and then the entire mounting mechanism in the present embodiment will be described.

  The relay shaft 40 will be described with reference to FIG. FIG. 6A is a front view of the relay shaft 40, and FIG. 6B is a left side view of the center shaft 40.

  The shapes of the first cylindrical shaft 42 and the second cylindrical shaft 43 of the relay shaft 40 attached to the roller shaft are substantially the same as the first relay shaft 12 and the second relay shaft 13 of the relay shaft 10 in FIG. The screw holes 41a and 41c are substantially the same as the screw holes 11a and 11c. The relay shaft 40 is significantly different from the relay shaft 10 in that a protrusion 45 is provided on the left end surface of the second cylindrical shaft 43.

  The protrusion 45 includes a third cylindrical shaft 47 and a fourth cylindrical shaft 48. The third cylindrical shaft 47 has a circular diameter that is substantially the same as that of the large-diameter protrusion 26, and the length of the cylinder is longer than that of the large-diameter protrusion 26. The fourth cylindrical shaft 48 has substantially the same shape as the small diameter protrusion 27.

  One end surface of the third cylindrical shaft 47 is fixed to the left end surface of the second cylindrical shaft 43, and one end surface of the fourth cylindrical shaft 48 is fixed to the other end surface. The central axes of the third cylindrical axis 47 and the fourth cylindrical axis 48 are collinear with the central axes of the first cylindrical axis 42 and the second cylindrical axis 43.

  Four screw holes 41a to 41d are formed in the same circumference at a predetermined distance from the central axis of the relay shaft 40 so as to penetrate in the axial direction and be equally spaced. The screw holes 46a and 46b are formed at equal intervals on a circumference slightly far from the distance from the central axis of the central axis 40 to the screw holes 41a to 41d.

  Note that an insulating layer is formed on the entire surface of the relay shaft 40 by anodizing.

  Next, the stopper 50 will be described with reference to FIG. The stopper 50 in contact with the rotating portion 102a of the incremental encoder 102 is formed in a disc shape, and a hole 51 with its central axis as the center is formed so that the projection 45 passes therethrough. In addition, two screw holes 52a and 52b are bored at equal intervals on the same circumference spaced a predetermined distance from the central axis of the stopper 50.

  An insulating layer is also formed on the entire surface of the stopper 50 by alumite treatment. The stopper 50 corresponds to a rotation transmission member.

  Next, the rotation detector mounting mechanism in this embodiment will be described with reference to FIG.

  Only the relay shaft 40 and the stopper 50 different from those of the first embodiment will be described, and the changed parts associated therewith will be described.

  The relay shaft 40 attached to the roller shaft is fixed to the roller shaft by inserting the bolt 101 into the screw holes 41a to 41d and screwing the bolt 101 into the roller shaft.

  The fourth cylindrical shaft 48 of the relay shaft 40 is inserted into the rotating portion of the absolute encoder 104 and is fixed to the rotating portion by a screw 106. That is, the absolute encoder 104 detects the rotation of the relay shaft 40.

  The stopper 50 in contact with the rotating portion 102a of the incremental encoder 102 has a bolt 130 inserted into the screw holes 52a and 52b of the stopper 50 and screwed into the screw holes 46a to 46d of the relay shaft 40, and a convex portion on the left end surface of the rotating portion 102a. It is fixed by sticking to. The legs of the bolt 130 are not shown. Further, the rotation of the relay shaft 40 is transmitted to the rotating portion 102 a via the stopper 50, so that the rotating portion 102 a rotates together with the relay shaft 40 and the stopper 50.

  In this case, the bolt 130 attached to the relay shaft 40 is a standard bolt, not an insulation bolt, because the relay shaft 40 and the stopper 50 are anodized.

  In this embodiment, the relay shaft 40 and the protrusion 45 are integrally formed. Thereby, it becomes a structure simplified more than Example 1, and in addition to the effect of Example 1, cost reduction can be aimed at further.

  Further, since an insulating layer is provided on the relay shaft 40 by anodizing, shaft current generated in the roller shaft does not flow through the incremental encoder 102 and the absolute encoder 104.

  Therefore, the incremental encoder 102 and the absolute encoder 104 can detect rotation without being affected by the shaft current. Since the stopper 50 is provided with an insulating layer by anodizing, the influence of the axial current can be further suppressed.

Although the present invention has been described in detail only for the specific examples described above, it is obvious to those skilled in the art that various changes and modifications are possible within the scope of the technical idea of the present invention. Such variations and modifications are naturally within the scope of the claims.

DESCRIPTION OF SYMBOLS 10,40 ... Relay shaft 11a-11d, 16a-16d, 25, 33a-33d, 34a-34d, 35a-35d, 41a-41d, 46a, 46b, 52a, 52b ... Screw hole 12, 42 ... 1st cylindrical shaft DESCRIPTION OF SYMBOLS 13, 43 ... 2nd cylindrical shaft 15a, 15b, 24a, 24b ... Insulating layer 20 ... Attachment 21 ... Disc part 21a ... Large diameter part 21b ... Small diameter part 22, 45 ... Projection part 26 ... Large diameter projection part 27 ... Small diameter Projection 30 ... Spacer 31, 51 ... Hole 32a-32d ... Step 36 ... Groove 47 ... Third cylindrical shaft 48 ... Fourth cylindrical shaft 50 ... Stopper 101, 103, 111, 115, 117, 119, 121, 130 ... Bolt DESCRIPTION OF SYMBOLS 102 ... Incremental encoder 102a ... Rotating part 102b ... Fixed part 104 ... Absolute encoder 105 ... Mounting piece 106 ... Screw 107 ... Absolutely Bolt 110 ... frame 112 ... tube 113 ... rod 114a, 114b ... bellows coupling 116, 118 ... mounting plate 120 ... rubber cushion 122 ... mount

Claims (7)

A relay shaft attached to the rotating shaft and rotating together with the rotating shaft;
A first rotation detector that has a rotating portion that rotates together with the relay shaft, and detects the number of rotations of the rotating shaft based on the rotation of the relay shaft;
A rotation transmitting member that is in close contact with the rotating portion of the first rotation detector by a fixing member that engages with the relay shaft and rotates together with the relay shaft and the rotating portion of the first rotation detector;
A second rotation detector that has a rotating part that is inserted into the rotation transmitting member and rotates together with the protruding part, and that detects the number of rotations of the rotating shaft based on the rotation of the rotation transmitting member. When,
A holding member that holds the first rotation detector and suppresses rotation of a portion other than the rotating portion in the second rotation detector;
And a support member for supporting the holding member.   The rotation detector mounting mechanism according to claim 1, wherein an insulating layer is provided on the relay shaft and the rotation transmission member, and the fixing member is an insulating member. A relay shaft attached to the rotating shaft and rotating together with the rotating shaft;
A first rotation detector that has a rotating portion that rotates together with the relay shaft, and detects the number of rotations of the rotating shaft based on the rotation of the relay shaft;
A rotation transmitting member that is in close contact with the rotating portion of the first rotation detector by a fixing member that engages with the relay shaft and rotates together with the relay shaft and the rotating portion of the first rotation detector;
A second rotation detector that has a rotating portion that is inserted into and rotates with the protruding portion provided on the relay shaft, and that detects the number of rotations of the rotating shaft based on the rotation of the relay shaft;
A holding member that holds the first rotation detector and suppresses rotation of a portion other than the rotating portion in the second rotation detector;
And a support member for supporting the holding member.   The rotation detector mounting mechanism according to claim 3, wherein an insulating layer is provided on the relay shaft and the rotation transmission member.   The first rotation detector is provided in a direction orthogonal to the relay shaft, and the rotation transmission member, the holding member, and the second rotation detector are provided in an axial direction of the relay shaft. The rotation detector mounting mechanism according to any one of claims 1 to 4.   The holding member is formed in a disc shape, a hole is formed in the center of the disc, and holds the first rotation detector at an outer peripheral end of one end surface of the disc, The rotation detector mounting mechanism according to any one of claims 1 to 5, wherein the second rotation detector is attached to an inner peripheral end portion of the other end face of the disc.   The rotation detector attachment mechanism according to any one of claims 1 to 6, wherein the relay shaft is attached to a rotation shaft of a chassis dynamometer.

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