JP5263652B2 - Actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator capable of connecting members with each other and assuring an highly reliable operation, even though constituted in a simple structure. <P>SOLUTION: A driving shaft 117 is connected to a nut 115 by cotters 120,120. Accordingly, a peripheral phase is freely adjustable, and the phase can be freely determined between the rotation stopper of the nut 115 mostly provided inside the actuator and a connecting surface mostly formed in the driving shaft 117. This causes a remarkable improvement in assembling operability. Further, a suppressing member 121 to prevent the cotters 120, 120 from coming off out of the peripheral groove 115b of the nut 115 protrudes a little from the outer diameter of the nut 115. Therefore, the suppressing member 121 is brought into contact with the inner peripheral surface of a housing 101A, and the shaft core of the nut 115 accurately conforms to the center of the inner peripheral surface of the housing 101A. Moreover, if a material of highly slidable synthesizing resin and the like is used for the suppressing member 121, a friction can be reduced in the outer peripheral surface of the nut 115 and the inner peripheral surface of the housing 101A, resulting in a stable operation. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to an electric actuator used in general industrial electric motors, automobiles, ships, and the like.

In a relatively small vessel that drives a screw with an internal combustion engine, the screw rotation in the forward direction and the screw rotation in the reverse direction are switched via a wire connected to a lever operated by the operator. The dog clutch is switched and engaged with the forward gear or the reverse gear. However, in recent years, there has been a demand for switching the dog clutch by electric drive for labor saving. As such an actuator, for example, one disclosed in Patent Document 1 can be used.
JP 2000-161461 A JP 2001-200191 A

  Here, in the structure shown in Patent Document 1, a female screw is formed on the inner periphery of the nut, a male screw is formed on the outer periphery of the output rod, and both screws are coupled. Moreover, the nut outer peripheral surface stored in a casing is made to contact the casing inner peripheral surface directly, or has a structure separated from the casing.

  Here, in screw connection, it is difficult to match the axial center of the nut and the output rod center, so when aligning the shaft core, it is necessary to separately provide an inlay portion on the nut and the output shaft, Therefore, it was a complicated structure.

  Also, in screw coupling, it is difficult to match the circumferential phase of the nut and the circumferential phase of the output rod. Therefore, when coupling the output rod to the driven member, the circumferential phase of the nut and the driven Since it is difficult to match the circumferential phase of the member, some contrivance is required for the joint of the output rod.

  Furthermore, when the outer peripheral surface of the nut is directly engaged with the inner peripheral surface of the casing, wear occurs on both contact surfaces, which may cause the nut core to shift and the operation to become unsmooth. On the other hand, in the structure where the outer peripheral surface of the nut and the inner peripheral surface of the casing are separated from each other from the beginning, there is inherently a center misalignment, which may cause galling or the like when a heavy load is applied, which may hinder operation. is there.

  In the technique disclosed in Patent Document 2, one end of the inner ring of the rolling bearing is applied to the stepped portion of the shaft, and the other end is divided into two shaft shaft grooves provided with a predetermined width on the end surface side. The bearing bearing member (cotter) is fitted to hold the rolling bearing. Further, this structure includes a cover that holds the fixing member divided into two parts and a circlip that fixes the cover. However, in this conventional example, since it is necessary to process two grooves for a fixing member (cotter) and a circlip at the screw shaft end, and three parts of a cotter, a cover, and a circlip are necessary, In order to ensure improvement in production efficiency and cost reduction at the time, further reduction in the number of parts and processing steps is desired.

  The present invention has been made in view of the problems of the related art, and an object thereof is to provide an actuator capable of connecting members and ensuring a reliable operation while having a simple structure. To do.

The actuator of the present invention is an actuator that drives a driven member.
A housing;
An electric motor attached to the housing and having a rotating shaft;
A rotating element connected to the rotating shaft and rotating;
An axial movement element coupled to the driven member and moving in the axial direction in accordance with the rotation of the rotation element;
The axial direction moving element includes the driven member, and forms a through groove that communicates the inner and outer peripheries ,
Cotter said inserted within the through groove, engage the the driven member,
It said driven member, said cotter is characterized Rukoto which have a consuming groove provided on the entire periphery to be engaged.

According to the present invention, the axial movement element includes the driven member and forms a through groove communicating with the inner and outer peripheries, and the cotter inserted into the through groove has the Since it is engaged with the driven member, the driven member and the axial movement element can be coupled to each other with a simple configuration.

  Preferably, the cotter has a half-moon shape, and an annular holding member cut in the circumferential direction is attached to the axial movement element so as to include the cotter inserted into the through groove.

  If the holding member has a hole or notch penetrating the inner and outer peripheries, when the holding member is assembled correctly to the axially moving element, the hole can be inserted into the hole. Since the operator can visually recognize through, it is possible to avoid missing parts and misassembly.

  The holding member is preferably made of resin and is slid with respect to the housing.

  The driven member preferably has a hook groove with which the cotter is engaged.

The cotter engaged with the outer periphery of the rotating element prevents relative movement of the bearing and the rotating element in the relative axial direction, and at least a part of the cotter is included in the power transmission member. This eliminates the need for a circlip or a groove with which the circlip is engaged, thereby reducing costs and reducing the number of components. The power transmission member includes a gear and a coupling member.

  It is preferable that the power transmission member surrounds only a part of the outer periphery of the cotter because the presence or absence of the cotter can be confirmed directly by the operator's eyes.

  The power transmission member is a gear, and it is preferable that the hollow cylindrical portion provided on the gear surrounds only a part of the outer periphery of the cotter because the presence or absence of the cotter can be confirmed directly by the operator's eyes.

  When the hollow cylindrical portion surrounds only the axial end portion side of the cotter, the remaining portion of the cotter is exposed, so that the hollow cylindrical portion is easily visible.

  It is preferable that a cutout or a hole is formed in the hollow cylindrical portion because the cotter can be visually recognized through the cutout or the hole.

  The power transmission member preferably has a convex portion that extends in the axial direction and engages with a concave portion formed on a side surface of the cotter.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an outboard motor using the actuator according to the present embodiment. FIG. 2 is a front view of the actuator according to the first embodiment. FIG. 3 is a view of the actuator of FIG. 2 as viewed in the direction of arrow III. FIG. 4 is a view of the configuration of FIG. 3 taken along line IV-IV and viewed in the direction of the arrow.

  In FIG. 1, the outboard motor 2 has a casing 2a fixed to the hull 1 and a cowling 2b attached to the upper portion thereof. An engine (not shown) in which the output shaft 3 is extended to the casing 2a is mounted inside the cowling 2b. A bevel gear 3 a is attached to the lower end of the output shaft 3.

  A propeller shaft 4 is horizontally disposed below the casing 2a and is rotatably supported. In the figure of the propeller shaft 4, the right end side protrudes outward from the casing 2 a, and the propeller 5 is attached to the end portion.

  The propeller shaft 4 passes through a forward bevel gear 6 and a reverse bevel gear 7 that mesh with the bevel gear 3 a, and a dog clutch 8 is disposed between the bevel gears 6 and 7. The dog clutch 8 can move relative to the propeller shaft 4 in the axial direction but can rotate integrally, and the bevel gears 6 and 7 can rotate relative to each other. Although not shown, the dog clutch 8 has protrusions facing in both axial directions. When the dog clutch 8 moves to the left in the figure, the protrusion engages with the concave portion of the bevel gear 6, and the dog clutch 8 and the bevel gear 6. And rotate together. On the other hand, by moving to the right in the figure, the protrusion engages with the concave portion of the bevel gear 7, and the dog clutch 8 and the bevel gear 7 rotate integrally.

  The dog clutch 8 is driven in the axial direction by a cam shaft 9. The cam shaft 9 is coupled so as to be displaced in the axial direction in accordance with the rotation of the operation shaft 10. The operation shaft 10 is connected to a drive shaft 117 of an actuator 100 described later via a link member 11.

  In FIG. 4, a cylindrical housing 101 includes an aluminum housing main body 101A, an aluminum or resin cover member 101B assembled with bolts B (FIG. 3) on the end surface thereof, and a motor bracket 101C. . The housing body 101A has a motor chamber 101a and a screw shaft chamber 101b. A motor 102 is disposed in the motor chamber 101a. The motor 102 is fixed to a plate-shaped motor bracket 101C. The motor bracket 101C sandwiches an outer ring of a ball bearing 114 described later between the housing main body 101A and the motor chamber 101a of the housing main body 101A and the screw shaft chamber. It is attached so as to block 101b.

  A rotating shaft 102a of the electric motor 102 protrudes from the motor bracket 101C, and a metal first gear 103 is attached to the end of the rotating shaft 102a so as not to be relatively rotatable by press-fitting. A resin-made second gear 105 is rotatably disposed around the long shaft 104 implanted in the motor bracket 101C, and meshes with the large gear portion 106a of the first gear 103 and the third gear 106. Yes.

  The resin-made third gear 106 has a large gear portion 106a and a small gear portion 106b formed coaxially, and is attached to the end of the screw shaft 107 so as not to be relatively rotatable by serration coupling. A support member 108 is attached to the motor bracket 101C so as to cover a part of the third gear 106. Here, the first gear 103, the second gear 105, and the third gear 106 constitute a first power transmission mechanism.

  A fourth gear 109 disposed adjacent to the second gear 105 is rotatably supported around the long shaft 104. The resin-made fourth gear 109 has a large gear portion 109 a meshed with the small gear portion 106 b of the third gear 106 and a small gear portion 109 b formed coaxially.

  The small gear portion 109 b of the fourth gear 109 meshes with the large gear portion 111 a of the fifth gear 111 that is rotatably supported with respect to the short shaft 110 implanted in the support member 108 in parallel with the long shaft 104. ing. The resin-made fifth gear 111 has a large gear portion 111a and a small gear portion 111b formed coaxially. The small gear portion 111 b meshes with a sixth gear 112 that is disposed adjacent to the fifth gear 111 and rotatably supported around the long shaft 104. A bush for smooth rotation may be disposed between the long shaft 104 and the short shaft 110 and each gear.

  The potentiometer 113 as a sensor is fitted and disposed in the hole 101d of the cover member 101B and is fixed by a machine screw SB (FIG. 2). The measurement shaft 113a is connected to the sixth gear 112 and rotates integrally. It is like that. The tip of the long shaft 104 extending in a cantilever manner is supported by the potentiometer 113 or the hole 101d via the sixth gear 112 and the measurement shaft 113a. The potentiometer 113 can accurately detect an angle within a predetermined range (for example, 90 degrees) of the measurement axis 113a. Here, the first gear 103, the second gear 105, the third gear 106, the fourth gear 109, the fifth gear 111, and the sixth gear 112 constitute a second power transmission mechanism. The cover member 101B has a function as a gear cover for sealing so that foreign matter does not enter each gear. In addition, it is preferable to use different resin materials for the gears to be engaged with each other because wear can be suppressed.

  In FIG. 4, the screw shaft 107 is rotatably supported by a ball bearing 114 on the right end side in the drawing with respect to the housing main body 101A. The screw shaft 107 has a male screw groove 107a on the left end side.

  The screw shaft 107 passes through a cylindrical nut 115. A female screw groove 115a is formed on the inner peripheral surface of the nut 115 so as to face the male screw groove 107a, and a large number of balls 116 are formed in a spiral space (rolling path) formed by both the screw grooves 107a and 115a. It is arranged to roll freely. The nut 115 is provided with a detent (not shown) with respect to the housing main body 101A, and is relatively movable in the axial direction in the screw shaft chamber 101b, but is not relatively rotatable. A nut 115 as an axial movement element, a screw shaft 107 as a rotation element, and a ball 116 as a rolling element constitute a ball screw mechanism, and the ball screw mechanism and the following drive shaft 117 drive the ball screw mechanism. Configure the mechanism.

  The left end of the screw shaft 107 penetrates into a bag hole 117a formed in the round shaft-shaped drive shaft 117. The right end of the drive shaft 117 in the drawing is coaxially fitted to the nut 115 and is connected by a cotter (described later) and moves integrally as will be described later. The drive shaft 117 is supported by the bush 118 so as to be movable in the axial direction with respect to the housing body 101A, and a seal 119 is disposed on the left side (external side) of the bush 118, and the housing body 101A and the drive shaft 117 are disposed. Prevents foreign matter such as seawater and dust from entering between. A hole 117b for connecting to the link member 11 is formed at the end of the drive shaft 117 protruding from the housing main body 101A.

  FIG. 5 is a view of the configuration of FIG. 4 taken along the line VV and viewed in the direction of the arrow. FIG. 6 is an exploded view of the nut 115 and the drive shaft 117. In FIG. 6, a circumferential groove 115 b is formed on the outer periphery of the nut 115, and the bottom surface of the circumferential groove 115 b has a shape that is scraped off by two parallel surfaces sandwiching the axis, thereby the circumferential groove 115 b. And through-grooves 115c and 115c (see FIG. 5) that communicate with the inner peripheral surface of the nut 115 are formed. On the other hand, in the vicinity of the end of the drive shaft 117, a circumferential groove 117c is formed as a hanging groove. In addition, the inner peripheral surface of the nut 115 and the outer peripheral surface of the drive shaft 117 have dimensions that allow a spigot fit.

  At the time of assembly, the end of the drive shaft 117 is inserted into the nut 115, and the meniscus cotters 120, 120 are inserted into the circumferential groove 115b with the through grooves 115c, 115c positioned radially outward of the circumferential groove 117c. Insert from above and below. Then, the flat portions 120a and 120a of the cotters 120 and 120 pass through the through grooves 115c and 115c, protrude from the inner peripheral surface of the nut 115, and engage with the peripheral groove 117c of the drive shaft 117 (FIG. 5). reference). In such a state, the nut 115 and the drive shaft 117 are connected in the axial direction without backlash in a state where the shaft cores are aligned by fitting with a spigot and move integrally.

  Thereafter, the holding member 121 formed by cutting out a part of the ring (that is, C-shaped) is fitted into the circumferential groove 115b of the nut 115 while being elastically deformed. Accordingly, the cotters 120 and 120 are fixed to the inner periphery of the holding member 121 while being placed in the through grooves 115c and 115c, and the cotters 120 and 120 are prevented from coming out of the peripheral groove 115b. If the holding member 121 is made of a resin having excellent slidability and is fitted in the circumferential groove 115b of the nut 115 and has an outer diameter slightly larger than the outer diameter of the nut 115, the movement of the nut 115 is performed. Since it sometimes slides with respect to the inner periphery of the housing 101A, it is possible to avoid contact between metals and reduce wear and drag torque.

  In FIG. 1, the wiring 102b of the motor 102 and the wiring 113b of the potentiometer 113 extend to the cowling 2b side and are further connected to a drive circuit (not shown).

  FIG. 9 is a view seen from the side in a state in which the nut 115 and the drive shaft 117 according to the modification of the present embodiment are connected. FIG. 10 is an enlarged view showing a part indicated by an arrow X in the configuration of FIG. In this modification, a hole 121a penetrating the inner and outer periphery is formed in the holding member 121 fitted in the circumferential groove 115b of the nut 115.

  According to this modified example, if the cotter 120 is correctly assembled before the restraining member 121 is assembled to the circumferential groove 115b, the operator can visually recognize the cotter 120 through the hole 121a. A pair can be avoided. It is preferable that one hole 121a is provided for each cotter 120. However, even when only a single hole 121a is formed, two holes 121a can be obtained by rotating the restraining member 121 relative to the nut 115. Assembly confirmation of the cotters 120 and 120 can also be performed. The shape of the hole 120 is not limited to a circle, but may be a rectangle or a slit, or may be provided with a notch that connects the inner and outer periphery on the side surface of the holding member instead of the hole.

  Next, the operation of the present embodiment will be described. Here, since the bevel gear 3a is always meshed with both the forward bevel gear 6 and the reverse bevel gear 7, the bevel gear 6 to which power is transmitted from the bevel gear 3a as long as the internal combustion engine is operating. , 7 are rotating in opposite directions. However, in the neutral state, as shown in FIG. 1, since the dog clutch 8 is not engaged with any of the bevel gears 6 and 7, the power of the output shaft 3 is not transmitted to the propeller shaft 4 and the propeller 5 It will not rotate.

  Here, it is assumed that the operator operates a lever (not shown) in the forward direction from the neutral state. Then, in FIG. 4, electric power having a predetermined polarity is supplied to the motor 102, and the rotating shaft 102a rotates in a predetermined direction. Since the rotational force of the rotating shaft 102a is transmitted to the screw shaft 107 via the first gear 103, the second gear 105, and the third gear 106, the nut 115 is moved to the left in FIG. 4 according to the rotation of the screw shaft 107. It is displaced to. When the nut 115 is displaced to the left, the drive shaft 117 moves in a protruding direction, so that the link member 11 pivots in FIG. Accordingly, the operation shaft 10 rotates in a predetermined direction, the cam shaft 9 moves to the left via a cam mechanism (not shown), and the dog clutch 8 is engaged with the forward bevel gear 6. As a result, the power of the output shaft 3 can be transmitted to the propeller shaft 4 via the bevel gears 3a and 6 and the dog clutch 8, and the propeller 5 can be rotated forward.

  On the other hand, the rotational force of the rotating shaft 102a is applied to the measuring shaft 113a of the potentiometer 113 via the first gear 103, the second gear 105, the third gear 106, the fourth gear 109, the fifth gear 111, and the sixth gear 112. Communicated. A signal corresponding to the rotation of the measuring shaft 113a is input from the potentiometer 113 to a drive circuit (not shown) via the wiring 113b. If it is determined that the screw shaft 107 is rotated by a predetermined rotation amount based on the signal, the drive circuit stops the power supply to the motor 102.

  On the other hand, when the operator operates a lever (not shown) in the reverse direction, in FIG. 4, power having a reverse polarity is supplied to the motor 102, and the rotating shaft 102 a rotates in the reverse direction. With this operation, the drive shaft 117 of the actuator 100 moves in the retracting direction. Accordingly, the operating shaft 10 rotates in the reverse direction via the link member 11 in FIG. 1, the cam shaft 9 moves to the right via the cam mechanism (not shown), and the dog clutch 8 is engaged with the reverse bevel gear 7. Let As a result, the power of the output shaft 3 can be transmitted to the propeller shaft 4 via the bevel gears 3a and 7 and the dog clutch 8, and the propeller 5 can be rotated in the reverse direction.

  According to the present embodiment, since the drive shaft 117 is connected to the nut 115 by the cotters 120, 120, the phase in the circumferential direction can be freely adjusted, and the nut 115 that is often installed inside the actuator is rotated. Since the circumferential phase between the stopper and the coupling surface with the other member formed on the drive shaft 117 can be freely set, the assemblability is significantly improved. Further, since the holding member 121 that prevents the cotters 120, 120 from coming out of the circumferential groove 115b of the nut 115 protrudes slightly from the outer diameter of the nut 115, the holding member 121 and the inner peripheral surface of the housing 101A are in contact with each other. Then, the axis of the nut 115 and the center of the inner peripheral surface of the housing 101A coincide with each other with high accuracy. In addition, if a material such as a synthetic resin having a high sliding characteristic is used for the holding member 121, wear on the outer peripheral surface of the nut 115 and the inner peripheral surface of the housing 101A is suppressed, and a stable operation can be obtained.

  FIG. 7 is a cross-sectional view showing the periphery of a bearing of an actuator according to another embodiment. FIG. 8 is a perspective view of the cotter. In the present embodiment, the screw shaft 107 has a first flange portion 107b and a second flange portion 107c. A large-diameter portion 107d and a small-diameter portion 107e are formed between the first flange portion 107b and the second flange portion 107c. The inner ring of the bearing 114 is fitted into the large-diameter portion 107d by press fitting, and the end face is brought into contact with the first flange portion 107b.

  As shown in FIG. 8, the cotters 220 and 220 have a shape like a half of a donut plate shape. The cotters 220 and 220 are inserted to face each other from the outside in the radial direction of the small-diameter portion 107e, and their inner edges are arranged on the outer periphery of the small-diameter portion 107e. Engaged. With the cotters 220 and 220 engaged with the outer periphery of the small diameter portion 107e, the cotters 220 and 220 are sandwiched between the inner ring of the bearing 114 and the second flange portion 107c. Thereby, the inner ring of the bearing 114 can be prevented from coming off.

  However, since the cotters 220 and 220 may fall off as they are, the hollow cylindrical portion 106c formed in the third gear 106 made of resin (or metal) fixed to the screw shaft 107 may be replaced with the second flange portion 107c. It extends from the side and covers the outer periphery of the cotters 220 and 220. As a result, the cotters 220 and 220 cannot move in a direction away from the small diameter portion 107e, that is, can be prevented from coming off. According to the present embodiment, a circlip or the like is unnecessary, and an actuator that is simple, has a small number of parts, and is excellent in assemblability is provided. Since other configurations are the same as those of the above-described embodiment, the description thereof is omitted. The power transmission member including the cotters 220 and 220 is not limited to a gear but may be a coupling member.

  FIG. 11 is a cross-sectional view showing the periphery of a bearing of an actuator according to still another embodiment. 12A is a side view of the cotter, and FIG. 12B is a view of one cotter of FIG. 12A as viewed in the direction of the arrow XIIB. In the present embodiment, a gear 306 which is a power transmission member is serrated to the end of the screw shaft 107 and has a central portion 306a formed with a small gear on the outer periphery, and extends radially from the central portion 306a. Flange portion 306b, an annular gear portion 306c formed on the outer periphery of the flange portion 306b, an axial direction extending from the flange portion 306b, and projecting outward (leftward) from the axial end of the gear portion 306c. A hollow cylindrical portion 306d.

  As shown in FIG. 12, the cotter 320 includes a fan-shaped flange portion 320b having a semicircular cutout 320a that engages with the small-diameter portion 107e of the screw shaft 107, and a half extending in the axial direction from the outer edge of the flange portion 320b. It consists of a cylindrical part 320c. The cotter 320 preferably has a hardness of HRC15 or higher.

  As shown in FIG. 11, when the gear 306 is assembled to the screw shaft 107 from the right side with the pair of cotters 320, 320 facing each other and assembled to the screw shaft 107, the motor bracket 101 </ b> C and the gear portion 306 c of the gear 306 A gap CL is generated between the two. The hollow cylindrical portion 306d of the gear 306 extends to the vicinity of the motor bracket 101C and surrounds only the end portion side of the semi-cylindrical portion 320c of the cotter 320. Other configurations are the same as those in the above-described embodiment, and thus description thereof is omitted.

  When the operator looks into the gap CL from the direction indicated by the arrow Y in the assembled state, when the cotter 320 is assembled at a fixed position, the cotter 320 is placed between the hollow cylindrical portion 306d and the motor bracket 101C. The part will be visually recognized. On the other hand, when the cotter 320 is not assembled due to a shortage or the like, the screw shaft 107 is visually recognized instead of the cotter 320 when the operator looks into the gap CL. Thereby, it is possible to inspect whether or not the cotter 320 is assembled at a fixed position without disassembling the gear 306.

  FIG. 13 is a cross-sectional view showing the periphery of a bearing of an actuator according to still another embodiment. 14 (a) is a side view of the gear, and FIG. 14 (b) is a view of the gear of FIG. 14 (a) as viewed in the direction of the arrow XIVB. In contrast to the embodiment shown in FIG. 11, in this embodiment, the hollow cylindrical portion 306d of the gear 306 'is extended, and notches 306e are formed at equal intervals in the circumferential direction. The small gear portion 306f formed on the outer periphery of the main body 306a meshes with the large gear portion 109a (FIG. 4) of the fourth gear 109. Other configurations are the same as those in the above-described embodiment, and thus description thereof is omitted.

  As shown in FIG. 13, when the gear 306 is assembled to the screw shaft 107 from the right side with the pair of cotters 320, 320 facing each other and assembled to the screw shaft 107, the hollow cylindrical portion 306d of the gear 306 ' It enters into the central hole of the bracket 101C and surrounds the semicylindrical portion 320c of the cotter 320 in the axial direction, but the cotter 320 is exposed in the radial direction through the notch 306e.

  When the operator looks into the gap CL from the direction indicated by the arrow Y in the assembled state, when the cotter 320 is assembled at a fixed position, a part of the cotter 320 is visually recognized through the notch 306e of the hollow cylindrical portion 306d. The Rukoto. On the other hand, when the cotter 320 is not assembled due to a shortage or the like, the screw shaft 107 is visually recognized instead of the cotter 320 when the operator looks into the gap CL. Accordingly, it is possible to inspect whether or not the cotter 320 is assembled at a fixed position without disassembling the gear 306 '. In addition, you may provide a hole instead of a notch.

  FIG. 15 is a cross-sectional view showing the periphery of a bearing of an actuator according to still another embodiment. 16A is a side view of the cotter, and FIG. 16B is a view of one cotter of FIG. 16A viewed in the direction of the arrow XVIB. Compared to the embodiment shown in FIGS. 11 and 12, in this embodiment, the configuration of the cotter is changed.

  More specifically, the cotter 320 ′, as shown in FIG. 16, extends in the axial direction from the fan-shaped flange portion 320b having a semicircular cutout 320a that engages with the screw shaft 107, and the flange portion 320b. It consists of a semi-cylindrical part 320c and a groove-like recess 320d formed on the side surface of the semi-cylindrical part 320c. Other configurations are the same as those in the embodiment shown in FIGS.

  As shown in FIG. 15, when the gear 306 is assembled to the screw shaft 107 from the right side with the pair of cotters 320 ′ and 320 ′ facing and assembled to the screw shaft 107, the hollow cylindrical portion of the gear 306 (here, The convex portion 306d engages with the concave portion 320d formed on the side surface without surrounding the semi-cylindrical portion 320c of the cotter 320 ′.

  When the operator looks into the gap CL from the direction indicated by the arrow Y in the assembled state, when the cotter 320 'is assembled in a fixed position, a part of the outer periphery of the cotter 320' is visually recognized. On the other hand, when the cotter 320 'is not assembled due to a missing item or the like, when the operator looks into the gap CL, the hollow cylindrical portion 306d of the gear 306 is visually recognized instead of the cotter 320'. Thereby, it is possible to inspect whether or not the cotter 320 ′ is assembled at a fixed position without disassembling the gear 306. In addition, visibility can be improved by changing the color of the cotter 320 'and the screw shaft 107 or the hollow cylindrical portion 306d.

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be modified or improved as appropriate. The actuator according to the present invention can be used not only for ships but also for vehicles and general industrial machines.

It is the schematic of the outboard motor using the actuator concerning this Embodiment. It is a front view of the actuator of a 1st embodiment. FIG. 3 is a diagram when the actuator of FIG. 2 is viewed in the direction of arrow III. It is the figure which cut | disconnected the structure of FIG. 3 by the IV-IV line and looked at the arrow direction. It is the figure which cut | disconnected the structure of FIG. 4 by the VV line and looked at the arrow direction. It is a figure which decomposes | disassembles and shows the nut 115 and the drive shaft 117. FIG. It is sectional drawing which shows the bearing periphery of the actuator concerning another embodiment. It is a perspective view of a cotter. It is the figure seen from the side in the state which connected the nut 115 and drive shaft 117 concerning the modification of this Embodiment. It is a figure which expands and shows the site | part shown by the arrow X of the structure of FIG. It is sectional drawing which shows the bearing periphery of the actuator concerning another embodiment. 12A is a side view of the cotter, and FIG. 12B is a view of one cotter of FIG. 12A as viewed in the direction of the arrow XIIB. It is sectional drawing which shows the bearing periphery of the actuator concerning another embodiment. 14 (a) is a side view of the gear, and FIG. 14 (b) is a view of the gear of FIG. 14 (a) as viewed in the direction of the arrow XIVB. It is sectional drawing which shows the bearing periphery of the actuator concerning another embodiment. 16A is a side view of the cotter, and FIG. 16B is a view of one cotter of FIG. 16A viewed in the direction of the arrow XVIB.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hull 2 Outboard motor 2a Casing 2b Cowling 3 Output shaft 3a Bevel gear 4 Propeller shaft 5 Propeller 6 Forward bevel gear 7 Reverse bevel gear 8 Dog clutch 9 Cam shaft 10 Operation shaft 11 Link member 12 Breather pipe 17 Drive shaft 100 Actuator 101 Housing 101A Housing body 101B Cover member 101C Motor bracket 101a Motor chamber 101b Screw shaft chamber 101d Hole 102 Motor 102a Rotating shaft 102b Wiring 103 First gear 104 Long shaft 105 Second gear 106 Third gear 106a Large gear portion 106b Small gear portion 107 screw shaft 107a male screw groove 108 support member 109 fourth gear 109a large gear portion 109b small gear portion 110 short shaft 111 fifth gear 111a large gear portion 111b small gear portion 112 sixth gear 113 potentiometer 113a Measuring shaft 113b Wiring 114 Ball bearing 115 Nut 115a Female thread groove 116 Ball 117 Drive shaft 117a Bag hole 118 Bush 119 Seal 120, 220 Cotter 121 Holding member 121a Hole 306, 306 'Gear 306a Center part 306b Flange part 306c Gear part 306c Flange Part 306d Hollow cylindrical part 306e Notch 320, 320 'Cotter 320a Notch 320b Flange part 320c Semi-cylindrical part 320d Recess CL Clearance Y Arrow B Bolt

Claims (4)

In an actuator that drives a driven member,
A housing;
An electric motor attached to the housing and having a rotating shaft;
A rotating element connected to the rotating shaft and rotating;
An axial movement element coupled to the driven member and moving in the axial direction in accordance with the rotation of the rotation element;
The axial direction moving element includes the driven member, and forms a through groove that communicates the inner and outer peripheries ,
Cotter said inserted within the through groove, engage the the driven member,
The driven member, the actuator which the cotter is characterized Rukoto which have a consuming groove provided on the entire periphery to be engaged.   The cotter has a half-moon shape, and an annular holding member cut in a circumferential direction is attached to the axial movement element so as to include the cotter inserted into the penetrating structure. Item 10. The actuator according to Item 1. An annular restraining member is attached to the axial movement element so as to enclose the cotter inserted in the through groove,
The actuator according to claim 2, wherein the holding member has a hole or a notch penetrating the inner and outer peripheries.   The actuator according to claim 2, wherein the holding member is made of resin and slides with respect to the housing.

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