JP2014219036A - Transmission mechanism and actuator using the transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission mechanism which suppresses increase in the number of components and which can perform a switching operation with a simple operation without enlarging the entire device, and an actuator including the transmission mechanism.SOLUTION: A transmission mechanism which transmits a driving force from an input axis to an output axis includes: a first rotary member to which the driving force is imparted from the input axis side; a second rotary member which imparts the driving force to the output axis; a penetration axis which rotates with the first rotary member and which penetrates the second rotary member so as to arrange it concentrically with the first rotary member; a first restraint part which is arranged on the first rotary member side of the second rotary member and rotates with the second rotary member; and a second restraint part which rotates with the penetration axis and which is arranged disengageably from the first restraint part. The penetration axis protrudes from one end of the second rotary member.

Description

  The present invention relates to a transmission mechanism for transmitting a driving force input from an input shaft to an output shaft, and an actuator using the transmission mechanism, and in particular, even when the input shaft becomes non-rotatable due to locking or the like. The present invention relates to a transmission mechanism having a fail-safe function capable of applying a driving force to an output shaft, and an actuator using the transmission mechanism.

  Conventionally, with a manual operation mechanism that switches between electric operation and manual operation, for example, when the input shaft is locked, ensuring operational safety, improving operability and workability An actuator having a transmission mechanism is known.

  Various structures are known for such a transmission mechanism. For example, as shown in Patent Document 1 below, a rotation operation shaft is rotated by a lever member attached to a housing, and the rotation operation shaft The slide member is advanced and retracted by rotation to switch between manual operation and electric operation.

JP 2008-256030 A

  However, according to the conventional switching structure, the lever member protrudes greatly from the housing, and there is a problem that the size of the entire actuator increases and the operation becomes large. Further, since the rotation operation shaft is configured to be rotatable, the number of parts of the transmission mechanism is increased, and the housing itself is also increased in size.

  The present invention has been made in order to solve the above-described problems, and suppresses an increase in the number of parts, and does not increase the size of the entire apparatus, and can perform a switching operation with a simple operation. And it aims at providing the actuator provided with this transmission mechanism.

  A transmission mechanism according to the present invention is a transmission mechanism that transmits a driving force from an input shaft to an output shaft, the first rotating member to which the driving force is applied from the input shaft side, and a driving force applied to the output shaft. A second rotating member that provides rotation, a penetrating shaft that rotates together with the first rotating member and penetrates the second rotating member so as to be concentrically disposed with the first rotating member, and the second rotation A first restraining portion that is disposed on the first rotating member side of the member and rotates together with the second rotating member, and rotates together with the through shaft and is detachably disposed with respect to the first restraining portion. A second restraining portion is provided, wherein the through shaft protrudes from one end of the second rotating member.

  According to the present invention, the first rotating member to which the driving force is applied from the input shaft side, the second rotating member to apply the driving force to the output shaft, the first rotating member, and the second rotating member rotate together with the second rotating member. A through shaft that penetrates the rotating member so as to be concentrically disposed with the first rotating member, and a first restraining portion that is disposed on the first rotating member side of the second rotating member and rotates together with the second rotating member And a second restraining portion that rotates together with the through shaft and is detachably disposed with the first restraining portion, and the through shaft projects from one end of the second rotating member. And the release of the restraint of the second restraining portion can be performed by pushing the penetrating shaft protruding from the second rotating member, so that it is possible to switch between manual operation and electric operation with a simple configuration and simple operation. .

Sectional drawing for demonstrating the structure of the actuator using the transmission mechanism which concerns on embodiment of this invention. The partial cross section figure for demonstrating the structure of the ball screw apparatus used for the actuator which concerns on embodiment of this invention. The front view of the 1st rotation member used for the transmission mechanism which concerns on embodiment of this invention. The side view of the 2nd rotation member used for the transmission mechanism which concerns on embodiment of this invention. The side view of the penetration axis | shaft used for the transmission mechanism which concerns on embodiment of this invention. The perspective view for demonstrating the structure of the transmission mechanism which concerns on embodiment of this invention. The perspective view for demonstrating the structure of the transmission mechanism which concerns on embodiment of this invention.

  Hereinafter, embodiments of a transmission mechanism according to the present invention and an actuator using the transmission mechanism will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  FIG. 1 is a cross-sectional view for explaining the structure of an actuator using a transmission mechanism according to an embodiment of the present invention, and FIG. 2 shows the structure of a ball screw device used for the actuator according to the embodiment of the present invention. FIG. 3 is a partial cross-sectional view for explaining, FIG. 3 is a front view of a first rotating member used in the transmission mechanism according to the embodiment of the present invention, and FIG. 4 is a transmission according to the embodiment of the present invention. FIG. 5 is a side view of a second rotating member used in the mechanism, FIG. 5 is a side view of a penetrating shaft used in the transmission mechanism according to the embodiment of the present invention, and FIGS. 6 and 7 illustrate the implementation of the present invention. It is a perspective view for demonstrating the structure of the transmission mechanism which concerns on a form.

  As shown in FIG. 1, the actuator 1 using the transmission mechanism 30 according to the present embodiment has a drive source 12 having an input shaft 10 and an output shaft 20, and the input shaft 10, the output shaft 20, A transmission mechanism 30 is interposed between them. These components are housed in a housing 2 to constitute the actuator 1.

  Various element parts such as an electric motor can be used for the drive source 12, and a rotational force for rotating the input shaft 10 is applied. An input gear 11 is attached to the input shaft 10, and the rotational force is transmitted to the transmission mechanism 30 by the input gear 11.

  The output shaft 20 is rotatably held by a bearing 22, and a rotational force is applied from the transmission mechanism 30 by an output gear 21 attached to the output shaft 20.

  The output shaft 20 constitutes the ball screw device 3, and this rotational motion is converted into a linear motion of the nut 23 by rotating the output shaft 20 with a rotational force applied via the transmission mechanism 30. ing. The ball screw device 3 is housed in an outer cylinder 25 attached to the housing 2, and an expansion / contraction part 24 is disposed to be extendable from one end of the outer cylinder 25. Further, a parallel key 26 is attached to the nut 23, and the parallel key 26 engages with a key groove 27 formed along the longitudinal direction on the inner periphery of the outer cylinder 25 to rotate the nut 23. It is regulated.

  The expansion / contraction part 24 is a cylindrical member. One end of the expansion / contraction part 24 is attached to the nut 23, so that the expansion / contraction part 24 moves with the movement of the nut 23, and the output shaft 20 can be accommodated on the inner peripheral side. Thus, since the expansion / contraction part 24 is formed in a cylindrical shape, the output shaft 20 and the expansion / contraction part 24 do not interfere with each other even when the expansion / contraction part 24 is housed in the outer cylinder 25. Can be formed compactly.

  As shown in FIG. 2, the ball screw device 3 used in the actuator 1 according to the present embodiment has an output configured as a screw shaft in which a spiral rolling element rolling groove 20 a is formed on the outer peripheral surface with a predetermined lead. The shaft 20 and a nut hole 23c through which the output shaft 20 penetrates are formed in a cylindrical shape, and the load rolling that faces the rolling element rolling groove 20a formed in the output shaft 20 on the inner peripheral surface of the nut hole 23c. A plurality of balls 29 are arranged between the rolling element rolling groove 20a and the loaded rolling element rolling groove 23a, and the output shaft 20 and the nut 23 are screwed together. Match. Note that the nut 23 is not limited to a cylindrical shape, and for example, a cross-sectional shape orthogonal to the axial direction may be formed in a cylindrical shape such as an external rectangular shape.

  The ball screw device 3 configured as described above is configured such that the nut 23 moves along the axial direction of the output shaft 20 by the relative rotation of the output shaft 20 and the nut 23.

  The nut 23 is formed of a metal such as steel in a cylindrical shape, and a flange 23 b for fixing the nut 23 to a mating part is formed on the outer peripheral surface thereof so as to extend in the radial direction of the nut 23. Seal members 28 are attached to both ends of the nut hole 23c in the axial direction. The seal member 28 prevents dust and the like from entering between the output shaft 20 and the nut 23 and It is possible to prevent the applied lubricant from leaking out of the ball screw device 3.

  Also, the nut 23 has a return pipe formed on the inner periphery with a direction changing path that changes the traveling direction of the ball 29 that has rolled in the rolling element rolling groove 20a to return to the original position of the rolling element rolling groove 20a. 29a is attached. By this return pipe 29a, the ball 29 that has rolled the rolling element rolling groove 20a in the circumferential direction of the output shaft 20 is returned to the original position, thereby realizing infinite circulation of the ball 29. Further, the return pipe 29 a is inserted and fixed in an attachment hole drilled along the radial direction of the nut 23.

  The transmission mechanism 30 includes a first rotating member 31 and a second rotating member 32, and the first rotating member 31 and the second rotating member 32 are arranged so as to be concentrically arranged. The through shaft 33 that penetrates the member 31 and the second rotating member 32 is combined. In the present embodiment, both the first rotating member 31 and the second rotating member 32 are gears.

  As shown in FIG. 3, the first rotating member 31 has a first tooth portion 31 a formed on the outer periphery, and a center hole 34 a through which the above-described through shaft 33 passes is drilled in the center. Further, a groove 34 on the notch is formed in the center hole 34a.

  As shown in FIG. 4, the second rotating member 32 has a second tooth portion 32 a formed on the outer periphery, an operation means attachment portion 37 extending in the axial direction at one end, and a first restraining portion on the other end surface. 35 is formed. Further, a through hole 36 is formed so as to penetrate the second tooth portion 32 a and the operation means attachment portion 37. A plurality of first restraining portions 35 are formed along the outer edge of the through hole 36 and are formed as claw portions protruding in the axial direction. Further, the outer periphery of the operation means attachment portion 37 is chamfered according to the tool so that a tool for manually rotating the second rotating member 32 can be attached.

  As shown in FIG. 5, the penetrating shaft 33 is a long cylindrical member, and a second restraining portion 38 that engages with the first restraining portion 35 described above is formed. Specifically, the second restraining portion 38 is formed as a groove-like engaging portion that engages with the claw portion so as to correspond to the claw portion of the first restraining portion 35.

  A gear mounting portion 39 and an extension portion 40 extend in the axial direction at both ends of the second restraining portion 38 in the axial direction, and the gear mounting portion 39 is inserted into the center hole 34 a of the first rotating member 31. Then, the extension portion 40 is inserted into the through hole 36 of the second rotating member 32, so that the transmission mechanism 30 is integrally combined.

  The gear mounting portion 39 is formed with a key groove 39a along the axial direction, and a key 44 as a protrusion inserted into the key groove 39a is formed with a groove 34 formed on the first rotating member 31. By engaging, the penetrating shaft 33 and the first rotating member 31 can be rotated together.

  The first rotating member 31 is arranged so as to be movable in the axial direction along the through hole 36 of the second rotating member 32 together with the through shaft 33.

  Further, the penetrating shaft 33 is urged toward the second rotating member 32 by the urging means 41. Any member may be applied to the urging unit 41 as long as the penetrating shaft 33 can be urged toward the second rotating member 32. For example, a coil spring is preferably used.

  Further, the operating means mounting portion 37 of the second rotating member 32 protrudes to the outside of the housing 2, and the extension portion 40 of the penetrating shaft 33 protrudes from the end surface of the operating means mounting portion 37. The second rotating member 32 is attached to the housing 2 so as not to move in the axial direction by a C clip or the like.

  Next, the operation of the transmission mechanism 30 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 6, in the normally used electric operation state, the penetrating shaft 33 is biased toward the second rotating member 32 by the biasing means 41, so that the second shaft formed on the penetrating shaft 33 is used. The restraining portion 38 and the first restraining portion 35 formed on the second rotating member 32 are engaged with each other. In this state, since the first rotating member 31 and the second rotating member 32 rotate together, the rotational force of the input gear 11 is transmitted to the output gear 21 via the transmission mechanism 30.

  Next, switching to manual operation is performed by pushing in a button-shaped extension 40 protruding from the operation means mounting portion 37 as shown in FIG. Since the first rotating member 31 is attached so as to be movable in the axial direction as described above, the first restricting portion 35 and the second restricting portion 38 are engaged by pushing the extension portion 40. The second rotating member 32 can be rotated independently even if the input shaft 10 is unrotatable due to the failure of the drive source 12 or the fixing of the input shaft 10 due to the failure of the drive source 12. The rotation of the second rotating member 32 may be performed with bare hands, or may be rotated by attaching an operation means such as a predetermined tool to the operation means attachment portion 37. With this configuration, the output shaft 20 can be easily rotated with a small force, and the size of the actuator can be made compact by removing the operating means during electric operation.

  Thus, since the actuator 1 using the transmission mechanism 30 according to the present embodiment urges the through shaft 33 by the urging member 41, the operation of pushing the extension 40 protruding from the second rotating member 32. Only manual operation and electric operation can be switched. With this configuration, the number of parts can be reduced, and the overall size of the transmission device 30 can be formed in a compact manner. Moreover, since it can switch to manual operation only by pushing the extension part 40, compared with the conventional switching operation, switching operation can be performed by very simple operation.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. For example, in the transmission mechanism of the present embodiment, the case where the first restraining portion and the second restraining portion are configured as the claw portion and the engaging portion has been described, but the first restraining portion and the second restraining portion are described. The part is not limited to this, and for example, the first rotating member and the second rotating member may be integrally rotated using a friction plate.

  Further, in the present embodiment, the case where the first rotating member and the second rotating member are formed using a pair of gears has been described, but the first rotating member and the second rotating member are configured in this manner. For example, a speed reduction mechanism may be configured by meshing a plurality of gears.

  In the present embodiment, the case where the first rotating member and the second rotating member are engaged with each other using gears has been described. However, the shapes of the first rotating member and the second rotating member are described. Is not limited to this, for example, the first rotating member and the second rotating member are constituted by a timing belt wheel, a sprocket, a pulley, and the like, and the input shaft, the first rotating member, the output shaft, and the second rotating member, It is also possible to construct a structure in which a timing belt, a chain and a belt are stretched to give a driving force.

  In this embodiment, the ball screw device using the return pipe is described as the ball screw device. However, the ball screw device is not limited to this. For example, an infinite circulation type ball screw device using a deflector is adopted. Alternatively, a finite circulation ball screw device or a sliding type that does not have rolling elements may be employed. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Actuator, 10 Input shaft, 12 Drive source, 20 Output shaft, 30 Transmission mechanism, 31 1st rotation member, 32 2nd rotation member, 33 Through-shaft, 34 Groove, 35 1st restraint part, 36 Through-hole , 38 Second restraint, 44 keys.

Claims (6)

A transmission mechanism that transmits driving force from an input shaft to an output shaft,
A first rotating member to which a driving force is applied from the input shaft side;
A second rotating member for applying a driving force to the output shaft;
A through shaft that rotates with the first rotating member and penetrates the second rotating member so as to be concentrically disposed with the first rotating member;
A first restraining portion disposed on the first rotating member side of the second rotating member and rotating together with the second rotating member;
A second restraining portion that rotates together with the penetrating shaft and is detachably disposed with the first restraining portion;
The transmission mechanism, wherein the penetrating shaft protrudes from one end of the second rotating member. The transmission mechanism according to claim 1, wherein
A transmission mechanism comprising urging means for urging the penetrating shaft toward the second rotating member. The transmission mechanism according to claim 1 or 2,
The first rotating member and the penetrating shaft are associated with a groove formed along one of the first rotating member and the penetrating shaft along the axial direction and a protrusion formed on the other shaft. A transmission mechanism characterized by combining. The transmission mechanism according to any one of claims 1 to 3,
An operation mechanism is detachably formed at one end of the second rotating member. The transmission mechanism according to any one of claims 1 to 4,
The first restraining portion is a claw portion protruding from the end surface of the second rotating member toward the first rotating member,
The transmission mechanism, wherein the second restraining portion is an engaging portion that engages with the claw portion. An input shaft;
An output shaft;
An actuator comprising: the transmission mechanism according to claim 1, which transmits a driving force from the input shaft to the output shaft.

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