Servo horn and servo device

Abstract

To secure high fixation strength to an output shaft.SOLUTION: A servo horn comprises: a first member fixed to an output shaft having a shaft side serration of a servo motor; and a second member fixed to the output shaft or the first member. On the first member, an insertion hole which is opened on the output shaft side and into which the output shaft is inserted is formed and a horn side serration to be engaged with the shaft side serration is formed on an inner peripheral surface. The first member has an outer peripheral surface formed as an inclined surface that becomes closer to the center side as it goes in an insertion direction of the insertion hole of the output shaft. On the second member, a fitting hole into which at least part of the first member is fitted is formed. The second member has an inner peripheral surface formed as a taper surface that is pressed against the inclined surface to press the horn side serration against the shaft side serration.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to the technical field of a servo horn fixed to the output shaft of a servo motor and a servo device equipped with a servo motor and a servo horn. [Background technology]

[0002] 2. Description of the Related Art Radio control systems that perform remote control by radio are used for controlled objects such as model cars and airplanes, as well as industrial controlled objects.

[0003] In such radio control systems, a servo device is mounted on the controlled object, and the servo device has a servo motor with an output shaft, a servo horn fixed to the output shaft, etc. (see, for example, Patent Document 1 and Patent Document 2).

[0004] In a servo motor, the driving force is reduced by a group of reduction gears and transmitted to an output shaft, to which a rotating shaft of a variable resistor is connected, and the rotation angle, rotation speed, and rotation direction of the output shaft are controlled based on a signal generated according to the resistance value of the variable resistor and a signal transmitted from a transmitter.

[0005] Shaft-side serrations (outer serrations) are formed on the outer peripheral surface of the output shaft, and a servo horn is fixed to the output shaft. Various types of servo horns with different shapes and sizes are used, and the servo horn has horn-side serrations (inner serrations). Therefore, the horn's horn-side serrations engage with the shaft-side serrations to prevent it from rotating relative to the output shaft, and it is fixed to the output shaft with screws or the like.

[0006] The servo horn has mounting holes formed at predetermined positions, and wires of a linkage mechanism are attached to the mounting holes. The linkage mechanism is connected to a movable part of a controlled object such as a model car.

[0007] In such a radio control system, the driving force of the servo motor is transmitted to the movable part of the controlled object via a servo horn and a linkage mechanism, thereby causing the movable part to operate in response to a signal transmitted from a transmitter. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-243026 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-76120 Summary of the Invention [Problem to be solved by the invention]

[0009] As mentioned above, the servo horn has the role of transmitting the driving force of the servo motor to the linkage mechanism connected to the movable part. Therefore, if the fixed state relative to the output shaft is unstable, the appropriate driving force will not be transmitted to the movable part, and the accurate operating state of the movable part will not be ensured.

[0010] In particular, as described above, the horn-side serrations engage with the shaft-side serrations to prevent the servo horn from rotating relative to the output shaft, but a slight gap (play) is required between the horn-side serrations and the shaft-side serrations to facilitate attachment and detachment of the servo horn to the output shaft, and this gap reduces the positional accuracy of the servo horn in the rotational direction relative to the output shaft. Therefore, it is desirable to ensure a high level of fixation of the servo horn to the output shaft in order to improve the positional accuracy of the servo horn in the rotational direction relative to the output shaft while ensuring ease of attachment and detachment of the servo horn to the output shaft.

[0011] Therefore, an object of the servo horn and servo device according to the present invention is to ensure high fixing strength to the output shaft. [Means for solving the problem]

[0012] A servo horn according to the present invention comprises a first member fixed to an output shaft of a servo motor having shaft-side serrations, and a second member fixed to the output shaft or the first member, wherein the first member has an insertion hole formed on the output shaft side into which the output shaft is inserted, and horn-side serrations formed on its inner peripheral surface to engage with the shaft-side serrations, the outer peripheral surface of the first member being formed as an inclined surface that approaches the center as it goes in the insertion direction of the output shaft into the insertion hole, and the second member has a fitting hole into which at least a part of the first member is fitted, and the inner peripheral surface of the second member is pressed against the inclined surface, forming a tapered surface that presses the horn-side serrations against the shaft-side serrations. The first member has a slot formed therein that communicates with the insertion hole. It is something.

[0013] As a result, when at least a portion of the first member is fitted into the fitting hole of the second member, the tapered surface of the second member is pressed against the inclined surface of the first member, and the horn-side serrations are pressed against the shaft-side serrations.

[0014] A servo device according to the present invention comprises a servo motor having an output shaft on which shaft-side serrations are formed, and a servo horn fixed to the output shaft, the servo horn comprising a first member fixed to the output shaft, and a second member fixed to the output shaft or the first member, the first member having an insertion hole formed on the output shaft side and into which the output shaft is inserted, and horn-side serrations formed on its inner peripheral surface to engage with the shaft-side serrations, the outer peripheral surface of the first member being formed as an inclined surface that approaches the center as it goes in the insertion direction of the output shaft into the insertion hole, the second member having a fitting hole into which at least a part of the first member is fitted, and the inner peripheral surface of the second member being formed as a tapered surface that is pressed against the inclined surface and presses the horn-side serrations against the shaft-side serrations. The first member has a slot formed therein that communicates with the insertion hole. It is something.

[0015] As a result, in the servo horn, when at least a portion of the first member is fitted into the fitting hole of the second member, the tapered surface of the second member is pressed against the inclined surface of the first member, and the horn side serration is pressed against the shaft side serration. [Effects of the Invention]

[0016] According to the present invention, when at least a portion of the first member is fitted into the fitting hole of the second member, the tapered surface of the second member is pressed against the inclined surface of the first member, and the horn side serration is pressed against the shaft side serration, thereby ensuring high fixing strength to the output shaft. [Brief explanation of the drawings]

[0017] [Figure 1] 2 to 13 show an embodiment of the servo horn and servo device of the present invention, and this figure is a perspective view showing the servo device with the servo motor and servo horn separated. [Figure 2] 3 shows the servo horn according to the first embodiment, and this figure is an exploded perspective view of the servo horn. [Figure 3] FIG. 3 is a cross-sectional view of a servo horn. [Figure 4] 5 shows a servo horn according to a second embodiment, and this figure is an exploded perspective view of the servo horn. [Figure 5] FIG. 3 is a cross-sectional view of a servo horn. [Figure 6] 7 and 8 show a servo horn according to a third embodiment, and this figure is an exploded perspective view of the servo horn. [Figure 7] FIG. 3 is a cross-sectional view of a servo horn. [Figure 8] FIG. 2 is a perspective view of a first member. [Figure 9] 10 shows a servo horn according to a fourth embodiment, and this figure is an exploded perspective view of the servo horn. [Figure 10] FIG. 3 is a cross-sectional view of a servo horn. [Figure 11] 12 and 13 show a servo horn according to a fifth embodiment, and this figure is an exploded perspective view of the servo horn. [Figure 12] FIG. 3 is a cross-sectional view of a servo horn. [Figure 13] FIG. 2 is a perspective view of a first member. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a servo horn and a servo device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0019] The servo motor of the servo device has an output shaft, and in the following, directions are indicated with the axial direction of the output shaft as the up-down direction. However, the directions shown below are for the convenience of explanation, and the present invention is not limited to these directions when it comes to implementing the invention.

[0020] <Overall configuration of servo device> First, the overall configuration of the servo device 100 will be described (see FIG. 1).

[0021] The servo device 100 includes a servo motor 50 and a servo horn 1. The servo motor 50 has a case body 51 made of a metal material or the like, necessary parts (not shown) arranged inside the case body 51, and an output shaft 52 protruding upward from the case body 51.

[0022] A control circuit board, a group of reduction gears, an angle sensor, etc. are arranged inside the case body 51. The output shaft 52 is connected to the angle sensor, etc. inside the case body 51, and is rotated at a reduced speed by the group of reduction gears. A sawtooth-shaped shaft-side serrations 52a are formed on the outer circumferential surface of the output shaft 52.

[0023] <Servo horn according to the first embodiment> Next, the servo horn 1 according to the first embodiment will be described (see FIGS. 2 and 3).

[0024] The servo horn 1 is composed of a first member 2 and a second member 3.

[0025] The first member 2 is formed into a shape having a longitudinal direction and consists of a fixed portion 4 fixed to the output shaft 52, protruding portions 5, 5 protruding in the opposite direction from the fixed portion 4, and hole forming portions 6, 6 protruding in the opposite direction from the protruding portions 5, 5.

[0026] The fixed portion 4 has a disk-shaped flat portion 7 facing the vertical direction and a substantially cylindrical tubular portion 8 that protrudes substantially downward from the outer periphery of the flat portion 7. Therefore, a space that opens downward is formed in the fixed portion 4, and this space is formed as an insertion hole 4a.

[0027] The cylindrical portion 8 has an outer peripheral surface formed with an inclined surface 8a that is inclined so that the diameter increases downward. Therefore, the outer diameter of the cylindrical portion 8 is smallest at the upper end and largest at the lower end, and the inclined surface 8a is formed so that it approaches the center as it moves in the insertion direction of the output shaft 52 into the insertion hole 4a. A spiral groove portion 8b is formed on the outer peripheral surface of the cylindrical portion 8.

[0028] Horn-side serrations 8c are formed on the inner peripheral surface of the cylindrical portion 8. The horn-side serrations 8c are formed in a sawtooth shape corresponding to the shaft-side serrations 52a of the output shaft 52. The cylindrical portion 8 is formed with slots 9, 9, for example, at positions 180 degrees apart. The slots 9 penetrate the inside and outside of the cylindrical portion 8, communicate with the insertion hole 4a, and open downward. The positions and number of slots 9 formed on the cylindrical portion 8 are optional.

[0029] The protrusions 5, 5 each protrude from the lower end of the cylindrical portion 8.

[0030] Mounting holes 6a, 6a that penetrate vertically are formed spaced apart in the longitudinal direction in the hole forming portion 6. The number of mounting holes 6a formed in the hole forming portion 6 and the positions at which the mounting holes 6a are formed in the hole forming portion 6 can be set arbitrarily.

[0031] The second member 3 is formed, for example, in a ring shape with a hexagonal outer shape, and the internal space is formed as a fitting hole 3a. The inner peripheral surface of the second member 3 is formed as a tapered surface 3b that is inclined so that the diameter increases as it goes downward. Therefore, the inner diameter of the second member 3 is smallest at the upper end and largest at the lower end. A screw portion 3c is formed on the inner peripheral surface of the second member 3.

[0032] The inclination angle of the tapered surface 3b of the second member 3 relative to the horizontal plane is slightly larger than the inclination angle of the inclined surface 8a of the first member 2 relative to the horizontal plane. Note that the inclination angle of the tapered surface 3b of the second member 3 relative to the horizontal plane may be the same as the inclination angle of the inclined surface 8a of the first member 2 relative to the horizontal plane.

[0033] In the servo horn 1 configured as described above, first, the output shaft 52 is inserted into the insertion hole 4a of the fixed portion 4, thereby attaching the first member 2 to the output shaft 52. At this time, the horn-side serrations 8c engage with the shaft-side serrations 52a, so that the first member 2 is attached to the output shaft 52 in a state where it is positioned circumferentially relative to the output shaft 52.

[0034] Next, the second member 3 is fixed to the first member 2. The second member 3 is fixed to the first member 2 by rotating the second member 3 relative to the cylindrical portion 8 and threading the threaded portion 3c into the threaded groove portion 8b. When the second member 3 is fixed to the first member 2, the cylindrical portion 8 of the first member 2 is fitted into the fitting hole 3a of the second member 3, and the tapered surface 3b of the second member 3 is pressed against the inclined surface 8a of the first member 2, deforming the cylindrical portion 8 toward the output shaft 52 and pressing the cylindrical portion 8 against the output shaft 52. Therefore, the first member 2 is fixed to the output shaft 52 by deforming the cylindrical portion 8 toward the output shaft 52 and pressing the horn-side serrations 8c against the shaft-side serrations 52a.

[0035] At this time, since the first member 2 has slots 9, 9 formed in the cylindrical portion 8, the cylindrical portion 8 is particularly likely to deform toward the output shaft 52, and the cylindrical portion 8 is pressed against the output shaft 52 with a large force.

[0036] As described above, by fixing the second member 3 to the first member 2 and fixing the first member 2 to the output shaft 52, the servo horn 1 is fixed to the output shaft 52 with high fixing strength. With the servo horn 1 fixed to the output shaft 52, a wire or the like of a linkage mechanism (not shown) is attached to the mounting hole 6a formed in the hole forming portion 6 of the first member 2. The linkage mechanism is connected to a movable part of the controlled object, such as a model automobile. Therefore, the driving force of the servo motor 50 is transmitted to the movable part of the controlled object via the servo horn 1 and the linkage mechanism, and the movable part is operated in accordance with the signal transmitted from the transmitter.

[0037] In the servo horn 1, a hole forming portion 6 is provided in the first member 2, positioned outside the second member 3, and a mounting hole 6a is formed in the hole forming portion 6 to which a linkage mechanism is attached.

[0038] Therefore, since the mounting hole 6a is formed in a portion of the first member 2 that is positioned outside the second member 3, it is possible to freely design the shape and size of the first member 2 and form the mounting hole 6a without impairing the functions of the first member 2 and the second member 3, thereby improving the design freedom regarding the position of the mounting hole 6a on the servo horn 1 and the number of mounting holes 6a to be formed.

[0039] Furthermore, since the first member 2 has a slot 9 formed therein, the first member 2 can be deformed within the range of the width of the slot 9 so that it is pressed against the output shaft 52 when the tapered surface 3b of the second member 3 is pressed against the inclined surface 8a. This ensures high fixing strength of the first member 2 to the output shaft 52 without applying excessive load from the first member 2 to the output shaft 52.

[0040] Furthermore, because the slots 9 are formed in a plurality at equal intervals in the circumferential direction, when the tapered surface 3b is pressed against the inclined surface 8a, a force is applied uniformly to the output shaft 52 from each portion of the first member 2 between the slots 9. This makes it possible to fix the first member 2 with a uniform force being applied to the output shaft 52, and ensures high fixing strength of the first member 2 to the output shaft 52. Furthermore, because the slots 9 are formed in a plurality at equal intervals in the circumferential direction, the load applied from the first member 2 to the output shaft 52 can be evenly distributed. Note that the slots 9 may be formed in a plurality at unequal intervals in the circumferential direction. In this case, a force is applied to the output shaft 52 from each portion of the first member 2 between the slots 9, and therefore high fixing strength of the first member 2 to the output shaft 52 can be ensured.

[0041] Furthermore, a screw groove portion 8b is formed on the outer peripheral surface of the first member 2, and a screw portion 3c that screws into the screw groove portion 8b is formed on the inner peripheral surface of the second member 3.

[0042] Therefore, since the second member 3 is fixed by rotating and screwing it relative to the first member 2, the second member 3 can be fixed to the first member 2 without using a separate screw member, thereby reducing the number of parts and facilitating the work of fixing the second member 3 to the first member 2.

[0043] <Servo horn according to the second embodiment> Next, a servo horn 1A according to a second embodiment will be described (see FIGS. 4 and 5).

[0044] Furthermore, the servo horn 1A described below differs from the servo horn 1 described above only in that the second member is fixed to the first member by a screw member. Therefore, only the parts that differ from the servo horn 1 will be described in detail, and other parts will be given the same symbols as those used for similar parts in the servo horn 1 and will not be described again.

[0045] The servo horn 1A is composed of a first member 2A and a second member 3A.

[0046] The first member 2A is composed of a fixed portion 4, protruding portions 5A, 5A, and hole-forming portions 6, 6.

[0047] The cylindrical portion 8 of the fixed portion 4 does not have a screw groove portion 8b formed therein.

[0048] The protrusions 5A, 5A each protrude from the lower end of the cylindrical portion 8. A screw hole 5a is formed in the protrusion 5A, penetrating vertically.

[0049] The second member 3A is formed in a shape having a longitudinal direction, and the internal space is formed as a fitting hole 3a. No threaded portion 3c is formed on the inner peripheral surface of the second member 3A. Screw insertion holes 3d, 3d that penetrate vertically are formed at both ends of the second member 3A in the longitudinal direction.

[0050] In the servo horn 1A configured as described above, first, the output shaft 52 is inserted into the insertion hole 4a of the fixed portion 4, thereby attaching the first member 2A to the output shaft 52. At this time, the horn-side serrations 8c engage with the shaft-side serrations 52a, so that the first member 2A is attached to the output shaft 52 in a state where it is positioned circumferentially relative to the output shaft 52.

[0051] Next, the second member 3A is fixed to the first member 2A. The second member 3A is fixed to the first member 2A by inserting the screw members 60, 60 into the screw insertion holes 3d, 3d of the second member 3A and screwing them into the threaded holes 5a, 5a. When the second member 3A is fixed to the first member 2A, the cylindrical portion 8 of the first member 2A is fitted into the fitting hole 3a of the second member 3A, and the tapered surface 3b of the second member 3A is pressed against the inclined surface 8a of the first member 2A, deforming the cylindrical portion 8 toward the output shaft 52 and pressing the cylindrical portion 8 against the output shaft 52. Therefore, the first member 2A is fixed to the output shaft 52 by deforming the cylindrical portion 8 toward the output shaft 52 and pressing the horn-side serrations 8c against the shaft-side serrations 52a.

[0052] At this time, since the first member 2A has slots 9, 9 formed in the cylindrical portion 8, the cylindrical portion 8 is particularly likely to deform toward the output shaft 52, and the cylindrical portion 8 is pressed against the output shaft 52 with a large force.

[0053] As described above, second member 3A is fixed to first member 2A, and first member 2A is fixed to output shaft 52, so that servo horn 1A is fixed to output shaft 52 with high fixing strength.

[0054] In the servo horn 1A, a hole forming portion 6 is provided in the first member 2A, positioned outside the second member 3A, and a mounting hole 6a is formed in the hole forming portion 6 to mount a linkage mechanism.

[0055] Therefore, since the mounting hole 6a is formed in a portion of the first member 2A positioned outside the second member 3A, it is possible to freely design the shape and size of the first member 2A and form the mounting hole 6a without impairing the functions of the first member 2A and the second member 3A, thereby improving the design freedom regarding the position of the mounting hole 6a on the servo horn 1A and the number of mounting holes 6a to be formed.

[0056] Furthermore, since a slot 9 is formed in the first member 2A, when the tapered surface 3b of the second member 3A is pressed against the inclined surface 8a, the first member 2A can be deformed within the range of the width of the slot 9 so that it is pressed against the output shaft 52. Therefore, high fixing strength of the first member 2A to the output shaft 52 can be ensured without applying excessive load from the first member 2A to the output shaft 52.

[0057] Furthermore, since a plurality of slots 9 are formed at equal intervals in the circumferential direction, when the tapered surface 3b is pressed against the inclined surface 8a, a uniform force is applied to the output shaft 52 from each portion of the first member 2A between the slots 9. Therefore, the first member 2A can be fixed to the output shaft 52 with a uniform force being applied to the output shaft 52, and high fixing strength of the first member 2A to the output shaft 52 can be ensured.

[0058] <Servo horn according to the third embodiment> Next, a servo horn 1B according to a third embodiment will be described (see FIGS. 6 to 8).

[0059] Furthermore, the servo horn 1B described below differs from the servo horn 1 described above only in that both the first and second members are fixed to the output shaft by screw members. Therefore, only the parts that differ from the servo horn 1 will be described in detail, and other parts will be given the same symbols as those used for similar parts in the servo horn 1 and will not be described again.

[0060] The servo horn 1B is composed of a first member 2B and a second member 3B.

[0061] The first member 2B is composed of a fixed portion 4B, protruding portions 5, 5, and hole-forming portions 6, 6.

[0062] The fixed portion 4B has a disk-shaped flat portion 7B facing the up-down direction and a cylindrical portion 8 protruding substantially downward from the outer periphery of the flat portion 7B.

[0063] The fixed portion 4B has a screw insertion hole 7a formed in the center of the flat portion 7B, penetrating vertically. No screw groove 8b is formed in the cylindrical portion 8 of the fixed portion 4B.

[0064] The second member 3B has, for example, a circular outer shape and an internal space formed as a fitting hole 3a. No threaded portion 3c is formed on the inner peripheral surface of the second member 3B. A screw insertion hole 3d is formed in the center of the second member 3B, penetrating vertically.

[0065] In the servo horn 1B configured as described above, first, the output shaft 52 is inserted into the insertion hole 4a of the fixed portion 4B, thereby attaching the first member 2B to the output shaft 52. At this time, the horn-side serrations 8c of the first member 2B engage with the shaft-side serrations 52a, so that the first member 2B is attached to the output shaft 52 in a state where it is positioned circumferentially relative to the output shaft 52.

[0066] Next, the first member 2B and the second member 3B are fastened together to be fixed to the output shaft 52. The first member 2B and the second member 3B are fixed to the output shaft 52 by inserting the screw members 60 sequentially through the screw insertion holes 3d of the second member 3B and the screw insertion holes 7a of the first member 2B, and then screwing them into threaded holes formed in the center of the output shaft 52. When the first member 2B and the second member 3B are fixed to the output shaft 52, the cylindrical portion 8 of the first member 2B is fitted into the fitting hole 3a of the second member 3B, and the tapered surface 3b of the second member 3B is pressed against the inclined surface 8a of the first member 2B, deforming the cylindrical portion 8 toward the output shaft 52 and pressing the cylindrical portion 8 against the output shaft 52. Therefore, the first member 2B is fixed to the output shaft 52 by the cylindrical portion 8 being deformed toward the output shaft 52 and the horn-side serrations 8c being pressed against the shaft-side serrations 52a.

[0067] At this time, since the first member 2B has slots 9, 9 formed in the cylindrical portion 8, the cylindrical portion 8 is particularly likely to deform toward the output shaft 52, and the cylindrical portion 8 is pressed against the output shaft 52 with a large force.

[0068] As described above, first member 2B and second member 3B are fixed to output shaft 52, whereby servo horn 1B is fixed to output shaft 52 with high fixing strength.

[0069] In the servo horn 1B, a hole forming portion 6 is provided in the first member 2B, positioned outside the second member 3B, and a mounting hole 6a is formed in the hole forming portion 6 to which a linkage mechanism is attached.

[0070] Therefore, since the mounting holes 6a are formed in a portion of the first member 2B that is positioned outside the second member 3B, it is possible to freely design the shape and size of the first member 2B and form the mounting holes 6a without impairing the functions of the first member 2B and the second member 3B, thereby improving the design freedom regarding the position of the mounting holes 6a on the servo horn 1B and the number of mounting holes 6a to be formed.

[0071] Furthermore, since a slot 9 is formed in the first member 2B, the first member 2B can be deformed within the width of the slot 9 so that it is pressed against the output shaft 52 when the inner surface of the second member 3B is pressed against the inclined surface 8a, thereby ensuring high fixing strength of the first member 2B to the output shaft 52 without applying excessive load from the first member 2B to the output shaft 52.

[0072] Furthermore, since a plurality of slots 9 are formed at equal intervals in the circumferential direction, when the tapered surface 3b of the second member 3B is pressed against the inclined surface 8a, a uniform force is applied to the output shaft 52 from each portion between the slots 9, 9 in the first member 2B. Therefore, the first member 2B can be fixed with a uniform force being applied to the output shaft 52, and high fixing strength of the first member 2B to the output shaft 52 can be ensured.

[0073] Furthermore, in the servo horn 1B, the first member 2B and the second member 3B are fixed to the output shaft 52 by tightening them together, so that the fixing work of the first member 2B and the second member 3B can be performed at once, thereby improving the workability of the fixing work.

[0074] <Servo horn according to the fourth embodiment> Next, a servo horn 1C according to a fourth embodiment will be described (see FIGS. 9 and 10).

[0075] Furthermore, the servo horn 1C described below differs from the servo horn 1 described above in that the shapes of parts of the first and second members are different, the second member is fixed to the first member with a screw member, and mounting holes are formed in the second member.Therefore, only the parts that differ from the servo horn 1 will be described in detail, and the other parts will be given the same symbols as those used for similar parts in the servo horn 1 and will not be described again.

[0076] The servo horn 1C is composed of a first member 2C and a second member 3C.

[0077] The first member 2C is composed of a fixed portion 4 and protruding portions 5C, 5C.

[0078] The cylindrical portion 8 of the fixed portion 4 does not have a screw groove portion 8b formed therein.

[0079] The protrusions 5C, 5C each protrude from the lower end of the cylindrical portion 8. The protrusions 5C, 5C each have a screw hole 5a, 5a that penetrates vertically.

[0080] The second member 3C comprises a cover portion 10 that covers the fixed portion 4, protrusions 11, 11 protruding in the opposite direction from the cover portion 10, and hole forming portions 12, 12 protruding in the opposite direction from the protrusions 11, 11.

[0081] A space that opens downward is formed in the cover portion 10, and this space is formed as a fitting hole 10a. The cover portion 10 has an inner peripheral surface that is formed as a tapered surface 10b that is inclined so that the diameter increases as it goes downward.

[0082] The protrusions 11, 11 are each formed with a screw insertion hole 11a, 11a that penetrates vertically.

[0083] Mounting holes 12a, 12a that penetrate vertically are formed spaced apart in the longitudinal direction in the hole forming portion 12. The number of mounting holes 12a formed in the hole forming portion 12 and the positions at which the mounting holes 12a are formed in the hole forming portion 12 can be set arbitrarily.

[0084] In the servo horn 1C configured as described above, first, the first member 2C is attached to the output shaft 52 by inserting the output shaft 52 into the insertion hole 4a of the fixed portion 4. At this time, the horn-side serrations 8c of the first member 2C engage with the shaft-side serrations 52a, so that the first member 2C is attached to the output shaft 52 in a state where it is positioned circumferentially relative to the output shaft 52.

[0085] Next, the second member 3C is fixed to the first member 2C. The second member 3C is fixed to the first member 2C by inserting the screw members 60, 60 into the screw insertion holes 11a, 11a of the second member 3C and threading them into the screw holes 5a, 5a. When the second member 3C is fixed to the first member 2C, the cylindrical portion 8 of the first member 2C is fitted into the fitting hole 10a of the second member 3C, and the tapered surface 10b of the second member 3C is pressed against the inclined surface 8a of the first member 2C, deforming the cylindrical portion 8 toward the output shaft 52 and pressing the cylindrical portion 8 against the output shaft 52. Therefore, the first member 2C is fixed to the output shaft 52 by deforming the cylindrical portion 8 toward the output shaft 52 and pressing the horn-side serrations 8c against the shaft-side serrations 52a.

[0086] At this time, since the first member 2C has slots 9, 9 formed in the cylindrical portion 8, the cylindrical portion 8 is particularly likely to deform toward the output shaft 52, and the cylindrical portion 8 is pressed against the output shaft 52 with a large force.

[0087] As described above, second member 3C is fixed to first member 2C, and first member 2C is fixed to output shaft 52, whereby servo horn 1C is fixed to output shaft 52 with high fixing strength.

[0088] In the servo horn 1C, a hole forming portion 12 is provided in a second member 3C, positioned outside the first member 2C, and a mounting hole 12a is formed in the hole forming portion 12 to which a linkage mechanism is attached.

[0089] Therefore, since the mounting hole 12a is formed in a portion of the second member 3C that is positioned outside the first member 2C, it is possible to freely design the shape and size of the second member 3C and form the mounting hole 12a without impairing the functions of the first member 2C and the second member 3C, thereby improving the design freedom regarding the position of the mounting hole 12a in the servo horn 1C and the number of mounting holes 12a to be formed.

[0090] Furthermore, since a slot 9 is formed in the first member 2C, the first member 2C can be deformed within the width of the slot 9 so that it is pressed against the output shaft 52 when the inner surface of the second member 3C is pressed against the inclined surface 8a, thereby ensuring high fixing strength of the first member 2C to the output shaft 52 without applying excessive load from the first member 2C to the output shaft 52.

[0091] Furthermore, since a plurality of slots 9 are formed at equal intervals in the circumferential direction, when the tapered surface 3b of the second member 3C is pressed against the inclined surface 8a, a uniform force is applied to the output shaft 52 from each portion between the slots 9, 9 in the first member 2C. Therefore, the first member 2C can be fixed to the output shaft 52 with a uniform force being applied to it, and high fixing strength of the first member 2C to the output shaft 52 can be ensured.

[0092] <Servo horn according to the fifth embodiment> Next, a servo horn 1D according to a fifth embodiment will be described (see FIGS. 11 to 13).

[0093] Furthermore, the servo horn 1D described below differs from the servo horn 1 described above in that the shapes of parts of the first and second members are different, that both the first and second members are fixed to the output shaft by screw members, and that mounting holes are formed in the second member.Therefore, only the parts that differ from the servo horn 1 will be described in detail, and the other parts will be given the same symbols as those used for similar parts in the servo horn 1 and will not be described again.

[0094] The servo horn 1D is composed of a first member 2D and a second member 3D.

[0095] The first member 2D is configured by a fixed portion 4D.

[0096] The fixed portion 4D has a disk-shaped flat portion 7D facing up and down and a cylindrical portion 8D protruding substantially downward from the outer periphery of the flat portion 7D. The fixed portion 4D has a screw insertion hole 7a formed in the flat portion 7D that penetrates vertically. The cylindrical portion 8D of the fixed portion 4D does not have a screw groove portion 8b formed therein. The cylindrical portion 8D has, for example, four slots 9, 9, ... formed at equal intervals in the circumferential direction.

[0097] The second member 3D is composed of a cover portion 10D that covers the fixed portion 4D, protrusions 11D, 11D protruding in the opposite direction from the cover portion 10D, and hole-forming portions 12, 12 protruding in the opposite direction from the protrusions 11D, 11D.

[0098] The cover portion 10D has a space that opens downward, and this space is formed as a fitting hole 10a. The cover portion 10D has an inner circumferential surface that is formed as a tapered surface 10b that is inclined so that the diameter increases as it goes downward. A screw insertion hole 10c that penetrates vertically is formed in the center of the cover portion 10D.

[0099] Mounting holes 12a, 12a that penetrate vertically are formed spaced apart in the longitudinal direction in the hole forming portion 12. The number of mounting holes 12a formed in the hole forming portion 12 and the positions at which the mounting holes 12a are formed in the hole forming portion 12 can be set arbitrarily.

[0100] In the servo horn 1D configured as described above, first, the output shaft 52 is inserted into the insertion hole 4a of the fixed portion 4D, thereby attaching the first member 2D to the output shaft 52. At this time, the horn-side serrations 8c engage with the shaft-side serrations 52a, so that the first member 2D is attached to the output shaft 52 in a state where it is positioned circumferentially relative to the output shaft 52.

[0101] Next, the first member 2D and the second member 3D are fastened together to be fixed to the output shaft 52. The first member 2D and the second member 3D are fixed to the output shaft 52 by inserting the screw members 60 sequentially through the screw insertion holes 10c of the second member 3D and the screw insertion holes 7a of the first member 2D and then screwing them into threaded holes formed in the center of the output shaft 52. When the second member 3D is fixed to the output shaft 52, the cylindrical portion 8D of the first member 2D is fitted into the fitting hole 10a of the second member 3D, and the tapered surface 10b of the second member 3D is pressed against the inclined surface 8a of the first member 2D, deforming the cylindrical portion 8D toward the output shaft 52 and pressing the cylindrical portion 8D against the output shaft 52. Therefore, the first member 2D is fixed to the output shaft 52 by the cylindrical portion 8D being deformed toward the output shaft 52 and the horn-side serrations 8c being pressed against the shaft-side serrations 52a.

[0102] At this time, since the first member 2D has slots 9, 9, ... formed in the cylindrical portion 8D, the cylindrical portion 8D is particularly likely to deform toward the output shaft 52, and the cylindrical portion 8D is pressed against the output shaft 52 with a large force.

[0103] As described above, the first member 2D and the second member 3D are fixed to the output shaft 52, and thus the servo horn 1D is fixed to the output shaft 52 with high fixing strength.

[0104] In the servo horn 1D, a hole forming portion 12 is provided in a second member 3D, positioned outside the first member 2D, and a mounting hole 12a is formed in the hole forming portion 12 to which a linkage mechanism is attached.

[0105] Therefore, since the mounting holes 12a are formed in a portion of the second member 3D that is positioned outside the first member 2D, it is possible to freely design the shape and size of the second member 3D and form the mounting holes 12a without impairing the functions of the first member 2D and the second member 3D, thereby improving the design freedom regarding the position of the mounting holes 12a in the servo horn 1D and the number of mounting holes 12a to be formed.

[0106] Furthermore, since a slot 9 is formed in the first member 2D, the first member 2D can be deformed within the range of the width of the slot 9 so that it is pressed against the output shaft 52 when the inner surface of the second member 3D is pressed against the inclined surface 8a.Therefore, high fixing strength of the first member 2D to the output shaft 52 can be ensured without applying excessive load from the first member 2D to the output shaft 52.

[0107] Furthermore, since a plurality of slots 9 are formed at equal intervals in the circumferential direction, when the tapered surface 10b of the second member 3D is pressed against the inclined surface 8a, a uniform force is applied to the output shaft 52 from each portion between the slots 9, 9, ... in the first member 2D. Therefore, the first member 2D can be fixed with a uniform force being applied to the output shaft 52, and high fixing strength of the first member 2D to the output shaft 52 can be ensured.

[0108] Furthermore, in the servo horn 1D, the first member 2D and the second member 3D are fixed to the output shaft 52 by tightening them together, so the fixing work of the first member 2D and the second member 3D can be performed at once, thereby improving the workability of the fixing work.

[0109] <Summary> As described above, in the servo horns 1, 1A, 1B, 1C, 1D and the servo device 100, the outer peripheral surfaces of the first members 2, 2A, 2B, 2C, 2D are formed as inclined surfaces 8a that approach the center as they move in the insertion direction into the insertion hole 4a of the output shaft 52, the second members 3, 3A, 3B, 3C, 3D are formed with mating holes 3a, 10a into which at least a portion of the first members 2, 2A, 2B, 2C, 2D are fitted, and the inner peripheral surfaces of the second members 3, 3A, 3B, 3C, 3D are pressed against the inclined surfaces 8a, forming tapered surfaces 3b, 10b that press the first members 2, 2A, 2B, 2C, 2D toward the output shaft 52.

[0110] Therefore, when at least a portion of the first member 2, 2A, 2B, 2C, 2D is fitted into the fitting holes 3a, 10a of the second member 3, 3A, 3B, 3C, 3D, the tapered surfaces 3b, 10b are pressed against the inclined surface 8a and the horn side serration 8c is pressed against the shaft side serration 52a, thereby ensuring high fixing strength to the output shaft 52.

[0111] Furthermore, when the tapered surfaces 3b, 10b of the second members 3, 3A, 3B, 3C, 3D are pressed against the inclined surface 8a, a force is applied uniformly in the circumferential direction from the first members 2, 2A, 2B, 2C, 2D to the output shaft 52, so that the first members 2, 2A, 2B, 2C, 2D can be fixed to the output shaft 52 with a uniform force being applied to the output shaft 52.

[0112] <Other> The above shows an example in which the servo device 100 is equipped with a servo motor 50 and a servo horn 1, but if a servo horn 1A, a servo horn 1B, a servo horn 1C or a servo horn 1D is used instead of the servo horn 1, the servo device 100 is configured to be equipped with a servo motor 50 and a servo horn 1A, a servo horn 1B, a servo horn 1C or a servo horn 1D. [Explanation of symbols]

[0113] 100 Servo Device 50 servo motors 52 Output shaft 52a shaft side serration 1 servo horn 2. First member 3 Second member 3a mating hole 3b Tapered surface 3c Threaded part 4a Insertion hole 6 Hole forming part 6a Mounting hole 8a Slope 8b Spiral groove 8c horn side serration 9 Slit 1A servo horn 2A First member 3A Second member 1B Servo Horn 2B First member 3B Second member 1C Servo Horn 2C First component 3C Secondary Component 10a Mating hole 10b Tapered surface 12 Hole forming part 12a Mounting hole 1D Servo Horn 2D First part 3D Secondary Part

Claims

1. a first member fixed to an output shaft of a servo motor having shaft-side serrations; a second member fixed to the output shaft or the first member, an insertion hole that opens toward the output shaft and into which the output shaft is inserted is formed in the first member, and horn-side serrations that engage with the shaft-side serrations are formed on an inner peripheral surface of the first member; the first member has an outer peripheral surface formed as an inclined surface that approaches a center side in an insertion direction of the output shaft into the insertion hole, a fitting hole into which at least a part of the first member is fitted is formed in the second member; the second member has an inner peripheral surface formed as a tapered surface that is pressed against the inclined surface and presses the horn-side serrations against the shaft-side serrations, The first member has a slot formed therein that communicates with the insertion hole. Servo horn.

2. the first member is provided with a hole forming portion positioned outside the second member, A mounting hole for mounting a linkage mechanism is formed in the hole forming portion.

2. The servo horn of claim 1.

3. the second member is provided with a hole forming portion positioned outside the first member, A mounting hole for mounting a linkage mechanism is formed in the hole forming portion.

2. The servo horn of claim 1.

4. The slots are formed in a plurality at intervals in the circumferential direction.

2. The servo horn of claim 1.

5. A first member fixed to an output shaft having shaft side serrations of a servo motor; a second member fixed to the output shaft or the first member, an insertion hole that opens toward the output shaft and into which the output shaft is inserted is formed in the first member, and horn-side serrations that engage with the shaft-side serrations are formed on an inner peripheral surface of the first member; the first member has an outer peripheral surface formed as an inclined surface that approaches a center side in an insertion direction of the output shaft into the insertion hole, a fitting hole into which at least a part of the first member is fitted is formed in the second member; the second member has an inner peripheral surface formed as a tapered surface that is pressed against the inclined surface and presses the horn-side serrations against the shaft-side serrations, the first member is provided with a hole forming portion positioned outside the second member, A mounting hole for mounting a linkage mechanism is formed in the hole forming portion. Servo horn.

6. a spiral groove portion is formed on the outer peripheral surface of the first member, A threaded portion that threadably engages with the threaded groove portion is formed on the inner peripheral surface of the second member.

6. A servo horn according to claim 1, claim 2, claim 3, claim 4 or claim 5.

7. a servo motor having an output shaft on which shaft side serrations are formed; a servo horn fixed to the output shaft, The servo horn is a first member fixed to the output shaft; a second member fixed to the output shaft or the first member, an insertion hole that opens toward the output shaft and into which the output shaft is inserted is formed in the first member, and horn-side serrations that engage with the shaft-side serrations are formed on an inner peripheral surface of the first member; the first member has an outer peripheral surface formed as an inclined surface that approaches a center side in an insertion direction of the output shaft into the insertion hole, a fitting hole into which at least a part of the first member is fitted is formed in the second member; the second member has an inner peripheral surface formed as a tapered surface that is pressed against the inclined surface and presses the horn-side serrations against the shaft-side serrations, The first member has a slot formed therein that communicates with the insertion hole. Servo device.

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