JP6271200B2 - Length detection reel - Google Patents

Description

  The present invention relates to a length detection reel for detecting a telescopic position of a boom, an outrigger or the like provided in an aerial work vehicle or the like.

  Conventionally, in an industrial vehicle such as an aerial work vehicle, a detection device for detecting a telescopic position of a boom or an outrigger has been provided. As a detection device for detecting such an expansion / contraction length, for example, in Patent Document 1, when the boom is driven to extend or contract, a cord whose tip is connected to the tip of the boom is fed out or unwound. As the reel body rotates, the output shaft of the reel body rotates, and the potentiometer via the spur gear mechanism is rotated by the rotational output of the speed reducer that meshes with the pinion attached to the tip of the output shaft. Is designed to rotate. Thereby, in the detection apparatus of patent document 1, the voltage signal corresponding to the expansion-contraction position of a boom is output from a potentiometer, and the expansion-contraction length of a boom is detected.

Japanese Patent Laid-Open No. 06-018204

  However, in Patent Document 1, there is a problem that a bearing is used to suppress the swing of the output shaft that transmits the rotation of the drum, and it is necessary to secure a space for providing the bearing.

  The present invention has been made in view of the problems as described above, and is a length detection reel capable of suppressing a decrease in detection accuracy by suppressing a swing of a drum shaft without using a bearing. The purpose is to provide.

  In order to achieve the above object, a length detection reel according to the present invention includes a first base on which a fixed shaft is formed, a drum shaft formed in a protruding shape in one of the rotation center axis directions, A first fitting hole opened on the opposite side of the projecting direction and formed coaxially with the drum shaft, and a second fitting hole formed on the projecting direction side of the drum shaft and formed coaxially with the drum shaft. A drum having a fitting hole, and a winding portion around which a wire having one end fixed to an object is wound in a row in the drum axis direction can be supported in the radial direction of the drum shaft. A second base having an insertion hole into which the drum shaft can be inserted, a sun gear having a fitting shaft that fits into the second fitting hole so as to be coaxial with the drum shaft, and the insertion hole. An annular portion that is provided coaxially and has internal teeth, and a planetary gear that meshes with the sun gear and the internal teeth A planetary gear mechanism, a rotating seat on which a rotation information generating member is installed, a detection unit for detecting rotation information of the rotation information generating member and outputting the rotation information, and decelerating the rotational force of the planetary gear to A reduction mechanism for transmitting to the rotary seat; wherein the first fitting hole is fitted into the fixed shaft so that the drum is rotatable with respect to the first base; and the drum is provided on the first base. The drum base is inserted into the insertion hole so that the drum is rotatable with respect to the second base, and the second base is disposed between the first base and the second base. Is provided on the drum, and the fitting shaft and the second fitting hole are fitted so that the sun gear rotates according to the rotation of the drum, and is arranged on the opposite side of the drum. The annular portion is provided on the second base. .

  (1) According to the length detection reel of the present invention, the drum opens to the fixed shaft of the first base so as to be rotatable with respect to the first base, on the opposite side of the protruding direction of the drum shaft, A first fitting hole formed coaxially is fitted, and a drum shaft is inserted into the insertion hole of the second base body so as to be rotatable with respect to the second base body, and between the first base body and the second base body. Is provided. Further, the sun gear of the planetary gear mechanism opens to the projecting direction side of the drum shaft so as to rotate as the drum rotates, and the fitting shaft is fitted in the second fitting hole formed coaxially with the drum shaft. The planetary gear of the planetary gear mechanism that reduces and transmits the rotational force to the rotary seat on which the rotation information generating member is installed via the reduction mechanism is an internal tooth of an annular portion provided on the second base. And the sun gear. Therefore, in the length detection reel of the present invention, without using a bearing, the drum shaft when the drum rotates, and the swing of the fitting shaft that fits into the second fitting hole so as to be coaxial with the drum shaft. Therefore, it is not necessary to secure a space for providing the bearing, and it is possible to reduce the size and weight and to suppress the decrease in detection accuracy.

  (2) According to the length detection reel of the present invention, the speed reduction mechanism is provided coaxially with the planetary gear shaft and on the opposite side of the second base with respect to the meshing gear meshing with the sun gear. Since it has a reduction gear and a transmission gear that meshes with the reduction gear to reduce the rotational speed of the drum and transmit the rotational force of the drum to the rotary seat, the rotational force input from the drum shaft is reduced. It is possible to suppress the occurrence of backlash when decelerating and transmitting to the rotary seat, and to further improve the detection accuracy.

  (3) According to the length detection reel of the present invention, the drum is provided with the ridges formed in an annular shape on the outer peripheral sides of the respective surfaces facing the inner surface of the first substrate and the inner surface of the second substrate. Since each of the protrusions is in contact with the inner surface of the first base and the inner surface of the second base, the movement of the drum in the axial direction is suppressed by the first base and the second base. And the detection accuracy can be further improved.

  (4) According to the length detection reel of the present invention, the rotary seat is provided with the annular ridge formed on the surface facing the inner surface of the cover member. Therefore, the movement of the rotating seat in which the rotation information generating member is installed in the direction of the rotation axis can be reliably suppressed by the cover member, and the detection accuracy can be further improved.

It is a schematic sectional drawing which shows an example of embodiment of the reel for length detection which concerns on this invention. It is a schematic plan view which shows an example of embodiment of the length detection reel which concerns on this invention. It is a partially cutaway front view showing an example of an embodiment of a length detection reel according to the present invention. It is a schematic plan view which shows an example of a 1st base | substrate. It is a schematic plan view which shows an example of a drum. It is a schematic plan view which shows an example of a 2nd base | substrate. It is a partially expanded sectional view of FIG. It is a schematic bottom view which shows an example of a sun gear. It is a schematic bottom view which shows an example of a planetary gear and a reduction gear. It is a schematic front view which shows an example of a carrier pin. It is a schematic plan view which shows an example of a carrier plate. It is a schematic perspective view which shows a state when a carrier pin is attached to a carrier plate. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. The length detection reel 1 of the present invention is used, for example, for detecting the extension / contraction length of an object such as a boom or an outrigger provided in an industrial vehicle such as an aerial work vehicle (not shown). As shown in FIG. 1, the length detection reel 1 includes a first base 2 on which a fixed shaft 21 is formed, a drum 3 that is rotatably fitted to the fixed shaft 21, and a rotation center axis of the drum 3. A second base 4 having an insertion hole 41 into which a drum shaft 31 formed in a protruding shape in one direction is inserted, a planetary gear mechanism 5 to which the rotational force of the drum 3 is input, and a rotation information generating member 6 are installed. A rotating seat 7, a detection unit 8 that detects rotation information of the rotation information generating member 6, a reduction mechanism 9 that decelerates the rotational force input from the planetary gear mechanism 5 and transmits it to the rotation seat 7, and a second A first cover member 10 that is a cover member provided on the base 4 is provided.

  In the present embodiment, as shown in FIG. 4, the first base 2 has a drum accommodating portion 22 that accommodates the drum 3 as a concave space on the inside, and the drum 3 can be rotated substantially in the center of the drum accommodating portion 22. A fixed shaft 21 that is pivotally supported is formed. As shown in FIGS. 3 and 4, the wire 11 is wound around a winding portion 34 provided on the outer periphery of the drum 3, and is connected at one end to a tip portion of an object such as an outrigger. 11a. The first base 2 has an opening 18 formed by an upper opening portion 28 and a lower opening portion 48 when the drum 3 is rotated or unwound from the drum housing portion 22 as the object expands and contracts. A guide groove 23 for guiding and a connection portion accommodating portion 24 for accommodating the connecting portion 11a are formed when the wire 11 is wound, so that moisture adhering to the wire 11 does not enter the drum accommodating portion 22. A seal accommodating lower part 49 is formed in the vicinity of the lower opening 28 to form a seal accommodating part 19 together with a seal accommodating upper part 29 for accommodating a seal member (not shown) for sealing. The first base 2 is attached to a predetermined location so that the expansion / contraction length of the object can be detected, and is formed with a bolt hole 25 into which a bolt or the like for attaching to the predetermined location can be inserted. Further, the first base 2 is formed with a screw hole 26 so that the drum 3 can be attached to the second base 4 by screwing in a state where the drum 3 is accommodated in the drum accommodating portion 22. In addition, the 1st base | substrate 2 may be attached to a target object.

  As shown in FIGS. 1 and 5, the drum 3 includes a drum shaft 31 formed in a protruding shape on one side in the rotation center axis direction when the drum 3 rotates, and a side opposite to the protruding direction of the drum shaft 31. A first fitting hole 32 formed coaxially with the drum shaft 31, a second fitting hole 33 opened on the projecting direction side of the drum shaft 31 and formed coaxially with the drum shaft 31, The wire 11 has a winding portion 34 wound around the outer periphery in a plurality of rows in the direction of the drum shaft 31. Further, the drum 3 is formed with an attachment hole 35 for attaching the proximal end portion 11 b of the wire 11.

  As shown in FIG. 1, the drum 3 is provided on the first base 2 in a state where the first fitting hole 32 is fitted to the fixed shaft 21 so as to be rotatable with respect to the first base 2. The drum shaft 31 is disposed so as to be coaxial with the fixed shaft 21 of the first base 2. As shown in FIG. 5, the drum shaft 31 has a second fitting that opens on the protruding side of the drum shaft 31. A joint hole 33 is formed. The second fitting hole 33 is formed in a D shape in plan view, and is fitted to the fitting shaft 51 a of the sun gear 51 so that the sun gear 51 described later rotates as the drum 3 rotates.

  Also, the drum 3 is formed with a ridge 36 formed in an annular shape on the outer peripheral side of each surface facing the inner surface 27 of the first base 2 and the inner surface 47 of the second base 4 in the axial direction of the drum shaft 31. The ridges 36 are formed on the inner surface of the first base 2 when the second base 4 is mounted on the first base 2 and the drum 3 is provided between the first base 2 and the second base 4. 27 and the inner surface 47 of the second substrate 4. Therefore, the movement of the drum 3 in the direction of the drum shaft 31 is suppressed by the first base 2 and the second base 4. In the length detection reel 1 according to this embodiment, as shown in FIG. 3, the drum 3 is configured so that the wire 11 is fed out from the vicinity of the center in the direction of the drum shaft 31. In addition, since a force is also applied in the direction of the drum shaft 31, the structure is also supported in the direction of the drum shaft 31 in this way.

  The drum 3 includes a spring 12 that urges the drum 3 in the direction in which the wire 11 is rewound, and a base end portion 12 a of the spring 12 is fixed to the fixed shaft 21 of the first base 2. The leading end 12 b of the mainspring spring 12 is fixed to the inner peripheral surface 37 of the drum 3, and is fixed to the formed notch 21 a. Accordingly, when the drum 3 is rotated by driving the object in the extending direction and the wire 11 is fed out, an urging force is applied in the direction in which the wire 11 is rewound around the drum 3 by the mainspring 12. When the object is driven in the contraction direction, the drum 3 rotates in the direction of rewinding the wire 11 by the urging force of the mainspring spring 12, and the wire 11 can be automatically wound around the winding portion 34. The length detection reel 1 of the present invention is mainly used for detecting the expansion / contraction length of an object such as a boom or an outrigger provided in an industrial vehicle such as an aerial work vehicle. Therefore, as shown in FIGS. 1 and 5, the wire 11 is wound over a plurality of circumferences in the axial direction of the winding portion 34.

  As shown in FIGS. 1 and 6, the second base 4 has an insertion hole 41 that can support the drum shaft 31 in the radial direction of the drum shaft 31 and into which the drum shaft 31 can be inserted. The second base 4 is provided on the drum 3 by inserting the drum shaft 31 into the insertion hole 41 so that the drum 3 can rotate with respect to the second base 4, and the drum 3 is connected to the first base 2 and the second base 4. It will be in the state arrange | positioned between the base | substrates 4. FIG. In the present embodiment, an example is shown in which the drum shaft 31 is supported by the insertion hole 41 so as to prevent the drum shaft 31 from moving in the radial direction. However, the drum shaft 31 is prevented from moving or tilting in the radial direction. If it can suppress and the backlash of the drum 3 can be suppressed, you may comprise so that a drum axis | shaft may be indirectly supported between the insertion hole 41 and the drum axis | shaft 31 via packing (not shown).

  In the present embodiment, as shown in FIG. 6, the second base 4 is formed with a guide groove 42 for guiding the movement of the wire 11 and the opening 18 together with the lower opening 28, as in the first base 2. An opening upper portion 48 that forms the opening upper portion 48 together with the seal accommodating portion 19 is provided. Further, the second base 4 has a bolt hole 44 through which a bolt for attaching to a predetermined portion of the object can be inserted, and a screw hole 44 for attaching to the first base 2, and a bolt hole 25 of the first base 2. And at positions corresponding to the screw holes 26, respectively. Further, a screw hole 46 for attaching the first cover member 10 and a screw hole 47 for attaching the second cover member 13 are formed on the second base 4. In the present embodiment, the drum 3 is accommodated in the housing by fixing the second base 4 onto the first base 2.

  As shown in FIGS. 1 and 7, the planetary gear mechanism 5 transmits the rotational force of the drum 3 input from the drum shaft 31 to the speed reduction mechanism 9 and is coaxial with the drum shaft 31. The sun gear 51 having a fitting shaft 51a that fits into the second fitting hole 33, the annular portion 52 that is provided coaxially with the insertion hole 41 and has the inner teeth 52a, and meshes with the sun gear 51 and the inner teeth 52a. And a planetary gear 53.

  The sun gear 51 rotates in accordance with the rotation of the drum 3, and as shown in FIGS. 1 and 8, the sun gear 51 is fitted with a second fitting hole 33 formed coaxially with the drum shaft 31. 51a and teeth 51b that mesh with the meshing gear 53a of the planetary gear 53. As shown in FIG. 8, the fitting shaft 51 a is formed in a D shape substantially the same as the second fitting hole 33, and the sun gear 5 also rotates simultaneously with the rotation of the drum shaft 31. Yes. In addition, the shape of the fitting shaft 51a and the second fitting hole 33 is not limited to this shape, and may be any shape that allows the sun gear 51 to be rotated in accordance with the rotation of the drum 3. . Further, as shown in FIG. 13, a planetary gear 53 is provided around the sun gear 51 so as to mesh with the teeth 51b.

  As shown in FIG. 7, the planetary gear 53 includes a meshing gear 53a that meshes with the teeth 51b of the sun gear 51 and the internal teeth 52a of the annular portion 52, a carrier pin 53b into which the meshing gear 53a is inserted, and a carrier pin 53b. And two carrier plates 53c for supporting the both ends of each.

  As shown in FIG. 10, the carrier pin 53 b includes a substantially cylindrical body portion 14 and support shafts 15 provided on both ends of the body portion 14. As shown in FIG. 9, the meshing gear 53 a is inserted and attached to the body portion 14. In addition, as shown in FIG. 11, the carrier plate 53c has support holes 17 for supporting the support shaft 15 rotatably in the ring-shaped plate body 16 by the number of carrier pins 53b. Yes. Therefore, as shown in FIG. 12, the support shafts 15 at both ends of each carrier pin 53b are rotatably supported by the support holes 17 of the respective carrier plates 53c. As shown in FIG. 7, the support shaft 15 of the carrier pin 53b located on the annular portion 52 side abuts on the annular projection 52b of the annular portion 52, and the support shaft of the carrier pin 53b located on the rotating seat 7 side. 15 is in contact with the annular protrusion 7 b of the rotary seat 7, so that each carrier pin 53 b is supported by the annular portion 52 and the rotary seat 7. Therefore, as shown in FIG. 13, each of the meshing gears 53a revolves around the sun gear 51 while rotating around the carrier pin 53b between the sun gear 51 and the annular portion 52. The plate 53c is configured to rotate.

  The annular portion 52 is formed in an annular shape, and the second base body is coaxial with the insertion hole 41 as shown in FIG. 1 so that the sun gear 51 can be arranged at the annular center. 4 is provided on the side opposite to the drum 3 on the upper side. As shown in FIGS. 7 and 13, the annular portion 52 protrudes in the radial direction from an inner tooth 52 a that meshes with the meshing gear 53 a of the planetary gear 53, an annular projection 52 b that contacts the carrier plate 53 c, and an outer peripheral surface. Projecting portion 52c. As shown in FIG. 7, the annular portion 52 is fixed on the second base 4 by the protruding portion 52 c being pressed in the radial direction and the axial direction by the first cover member 10. Accordingly, even when the planetary gear 53 rotates, the movement of the inner teeth 52a in the axial direction and the outward movement in the radial direction are indirectly restricted by the cover member 10 and remain in the same position. That is, when the rotation of the sun gear 51 is transmitted to the annular portion 52 via the planetary gear 53 according to the rotation of the drum 3, the radial force of the sun gear 51 can be supported by the annular portion 52. As long as it has such an action, the annular portion 52 may be integral with the second base body 4. Accordingly, the sun gear 51 is supported from a direction perpendicular to the axis by the planetary gear 53 whose movement in the radial direction is restricted by the cover member 10. Therefore, the drum 3 fitted so as to rotate together with the sun gear 51 is also supported by the planetary gear 53 so as to suppress shaft blurring, and is supported together with the fixed shaft 21 and the insertion hole 41 to prevent the drum 3 from shaking. can do.

  The speed reduction mechanism 9 reduces the rotational force of the drum 3 input via the planetary gear mechanism 5 and transmits it to the rotary seat 7. In this embodiment, as shown in FIG. And the reduction gear 91 inserted and attached to the carrier pin 53 b so as to be coaxial with the reduction gear 91, and the rotational speed of the drum 3 is reduced to transmit the rotational force of the drum 3 to the rotary seat 7. Transmission gear 92.

  The reduction gear 91 is used to reduce the rotation of the drum 3 via the planetary gear 53. In the present embodiment, as shown in FIGS. 7 and 9, the carrier pin is the same as the meshing gear 53a. It is inserted and attached to 53b, provided so that it may be located in the rotation seat 7 side on the opposite side to the 2nd base | substrate 4 with respect to the meshing gear 53a, and a diameter is formed larger than the meshing gear 53a. The transmission gear 92 is for reducing the rotational force of the planetary gear 53 by the reduction gear 91 and transmitting it to the rotary seat 7. In the present embodiment, the rotary seat 7 is provided as internal teeth. Therefore, as shown in FIG. 14, when the reduction gear 91 rotates, the rotating seat 7 rotates via the transmission gear 92. In the present embodiment, an example in which the reduction gear 91 is provided coaxially with the planetary gear 53 is shown, but the present invention is not limited to this, and any gear that reduces the rotation of the planetary gear 53 can be used. Alternatively, one or a plurality of gears may be used. Further, the transmission gear 92 may be any one that can reduce the rotational force of the planetary gear 53 by the reduction gear 91 and transmit it to the rotary seat 7. The reduction mechanism 9 is a reduction mechanism using a spur gear or the like. May be. Accordingly, the speed reduction mechanism 9 may be any mechanism as long as the speed reduction is finally transmitted to the transmission gear 92 (including the speed reduction by the transmission gear itself) and the reduced rotational force is transmitted to the rotary seat 7.

  The rotary seat 7 rotates with the rotational force of the drum 3 decelerated via the speed reduction mechanism 9, and a rotation information generating member 6 is installed at the center as shown in FIGS. . Therefore, when the rotary seat 7 rotates, the rotation information generating member 6 also rotates. The rotation information generation member 6 is a member that generates rotation information of the drum 3 by the rotation of the drum 3, and the rotation information is detected by the detection unit 8. In this embodiment, a magnet is used, but an electrical signal, light, or the like can be used as long as rotation information can be generated in addition to the magnet. Further, the rotary seat 7 has a ridge 7a formed in an annular shape on the surface facing the inner surface of the first cover member 10, and an annular protrusion 7b that protrudes opposite to the ridge 7a and contacts the carrier plate 53c. And have. Since the protruding portion 7 a is provided so as to contact the inner surface of the first cover member 10 when the first cover member 10 is attached to the second base 4, it is parallel to the fitting shaft 51 a of the rotary seat 7. Movement in any direction can be suppressed. In the length detection reel 1, the rotation information generating member 6 installed on the rotary seat 7 is provided so as to be coaxial with the drum shaft 31 via the planetary gear mechanism 5 and the speed reduction mechanism 9. Yes.

  The detection unit 8 is for detecting rotation information of the rotation information generating member 6 installed on the rotary seat 7 and is provided at a position facing the rotation information generating member 6 on the first cover member cover 10. ing. The detection unit 8 includes, for example, a magnetoresistive element or the like, and outputs rotation information obtained from the rotation information generating member 6 to an unillustrated control circuit as an electric signal. For example, a potentiometer or the like can be used as 6 and the detection unit 8. In the control circuit, the expansion / contraction position of the object is obtained based on the rotation information output from the detection unit 8. The rotation information generating member 6 and the detection unit 8 are not particularly limited as long as the rotation information of the rotation seat 7 can be detected.

  The first cover member 10 is provided on the second base 4, and the detection unit 8 is installed at a position facing the rotation information generating member 6. Further, in the length detection reel 1, a second cover member 13 is provided so as to cover the detection unit 8 and the first cover member 10, and rainwater or the like is not applied to the detection unit 8 or the like from the outside. .

  Hereinafter, the operation of the length detection reel 1 according to the present invention will be described with reference to the drawings. In the length detection reel 1, when the object is extended, the drum 3 rotates with the extension, and the wire 11 is fed out. Further, as the drum 3 rotates, the sun gear 51 rotates in the direction indicated by the arrow in FIG. When the sun gear 51 rotates, the meshing gear 53a of the planetary gear 53 that meshes with the teeth 51a of the sun gear 51 rotates in the opposite direction to the sun gear, and around the sun gear 51 in the same direction as the rotation direction of the sun gear 51. As a result of the revolution, the carrier plate 53c also rotates in the same direction as the rotation direction of the sun gear 51. At this time, the reduction gear 91 shown in FIG. 14 is inserted and attached to the carrier pin 53b in the same manner as the meshing gear 53a, so that the sun gear 51 rotates around the sun gear 51 while rotating similarly to the meshing gear 53a. Revolves in the same direction as the rotation direction. Then, as shown in FIG. 14, when the reduction gear 91 rotates, the transmission gear 92 rotates in the same direction as the rotation of the reduction gear 91, and accordingly, the rotary seat 7 rotates in the direction opposite to the rotation direction of the sun gear 51. Will be decelerated to rotate. Further, when the object is contracted, the drum 3 rotates in the opposite direction to that when the object is extended. Accordingly, the arrows shown in FIGS. 11 is wound around the winding section 34 of the drum.

  The embodiment of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the scope of the idea of the present invention.

  The reel for length detection according to the present invention can be effectively used as a reel for length detection for detecting the expansion / contraction position of a boom or an outrigger provided in an industrial vehicle such as an aerial work vehicle.

DESCRIPTION OF SYMBOLS 1 Length detection reel 2 1st base | substrate 21 Fixed shaft 3 Drum 31 Drum shaft 32 1st fitting hole 33 2nd fitting hole 34 Winding part 36 Projection part 4 2nd base | substrate 41 Insertion hole 5 Planetary gear mechanism 51 Sun gear 51a Fitting shaft 52 Annular portion 52a Inner teeth 53 Planetary gear 53a Engagement gear 6 Rotation information generating member 7 Rotating seat 8 Detection portion 9 Reduction mechanism 91 Reduction gear 92 Transmission gear 10 Cover member 11 Wire

Claims (4)

A first base on which a fixed shaft is formed;
A drum shaft formed in a projecting shape in one of the rotation center axis directions; a first fitting hole formed on the opposite side of the projecting direction of the drum shaft and coaxially with the drum shaft; and the drum shaft A second fitting hole formed coaxially with the drum shaft and a wire having one end fixed to the object are wound around the outer periphery side by side in the drum shaft direction. A drum having a winding part;
A second base body that can be supported in a radial direction of the drum shaft and has an insertion hole into which the drum shaft can be inserted;
A sun gear having a fitting shaft that fits into the second fitting hole so as to be coaxial with the drum shaft; and an annular protrusion provided on the opposite side of the inner tooth and the second base body , coaxially with the insertion hole. an annular portion having a section, a planetary gear mechanism having a planetary gear meshing with said internal teeth and said sun gear,
A rotating seat on which the rotation information generating member is installed;
A detection unit that detects rotation information of the rotation information generating member and outputs the rotation information;
A reduction mechanism that reduces the rotational force of the planetary gear and transmits it to the rotary seat;
The first fitting hole is fitted to the fixed shaft so that the drum is rotatable with respect to the first base, and the drum is provided on the first base;
The drum base is inserted into the insertion hole so that the drum can rotate with respect to the second base, and the second base is placed between the first base and the second base. Provided on the drum,
The fitting shaft and the second fitting hole are fitted so that the sun gear rotates according to the rotation of the drum,
The annular portion is provided on the second base so as to be arranged on the opposite side of the drum ,
The planetary gear meshing with the sun gear and the internal teeth; and the annular portion that is indirectly fixed to the second base or integral with the second base, and the planetary protrusion is formed by the annular protrusion. by supporting the gear, length detecting reel characterized that you support a force in the radial direction of the sun gear. 2. The length detection reel according to claim 1 , wherein the rotary seat has an annular protrusion that supports the planetary gear on the second base side . 3. A first base on which a fixed shaft is formed;
A drum shaft formed in a projecting shape in one of the rotation center axis directions; a first fitting hole formed on the opposite side of the projecting direction of the drum shaft and coaxially with the drum shaft; and the drum shaft A second fitting hole formed coaxially with the drum shaft and a wire having one end fixed to the object are wound around the outer periphery side by side in the drum shaft direction. A drum having a winding part;
A second base body that can be supported in a radial direction of the drum shaft and has an insertion hole into which the drum shaft can be inserted;
A sun gear having a fitting shaft that fits into the second fitting hole so as to be coaxial with the drum shaft; an annular portion that is provided coaxially with the insertion hole and has internal teeth; A planetary gear mechanism having a planetary gear meshing with the internal teeth;
A rotating seat on which the rotation information generating member is installed;
A detection unit that detects rotation information of the rotation information generating member and outputs the rotation information;
A reduction mechanism that reduces the rotational force of the planetary gear and transmits it to the rotary seat;
The first fitting hole is fitted to the fixed shaft so that the drum is rotatable with respect to the first base, and the drum is provided on the first base;
The drum base is inserted into the insertion hole so that the drum can rotate with respect to the second base, and the second base is placed between the first base and the second base. Provided on the drum,
The fitting shaft and the second fitting hole are fitted so that the sun gear rotates according to the rotation of the drum,
The annular portion is provided on the second base so as to be arranged on the opposite side of the drum,
Each of the drums is provided with an annular ridge formed on the outer peripheral side of each surface facing the inner surface of the first substrate and the inner surface of the second substrate,
3. The length detection reel according to claim 1, wherein each of the protrusions is in contact with an inner surface of the first base and an inner surface of the second base. 4. A first base on which a fixed shaft is formed;
A drum shaft formed in a projecting shape in one of the rotation center axis directions; a first fitting hole formed on the opposite side of the projecting direction of the drum shaft and coaxially with the drum shaft; and the drum shaft A second fitting hole formed coaxially with the drum shaft and a wire having one end fixed to the object are wound around the outer periphery side by side in the drum shaft direction. A drum having a winding part;
A second base body that can be supported in a radial direction of the drum shaft and has an insertion hole into which the drum shaft can be inserted;
A sun gear having a fitting shaft that fits into the second fitting hole so as to be coaxial with the drum shaft; an annular portion that is provided coaxially with the insertion hole and has internal teeth; A planetary gear mechanism having a planetary gear meshing with the internal teeth;
A rotating seat on which the rotation information generating member is installed;
A detection unit that detects rotation information of the rotation information generating member and outputs the rotation information;
A reduction mechanism that reduces the rotational force of the planetary gear and transmits it to the rotary seat;
The first fitting hole is fitted to the fixed shaft so that the drum is rotatable with respect to the first base, and the drum is provided on the first base;
The drum base is inserted into the insertion hole so that the drum can rotate with respect to the second base, and the second base is placed between the first base and the second base. Provided on the drum,
The fitting shaft and the second fitting hole are fitted so that the sun gear rotates according to the rotation of the drum,
The annular portion is provided on the second base so as to be arranged on the opposite side of the drum,
A cover member for suppressing movement of the rotary seat in a direction parallel to the fitting shaft;
The rotating seat is provided with a protruding ridge formed in an annular shape on the surface facing the inner surface of the cover member,
The reel for length detection according to any one of claims 1 to 3, wherein the protruding portion is in contact with an inner surface of the cover member.

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