JP3708804B2 - Actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an actuator, and more particularly to an actuator that can reciprocate an output shaft in a predetermined linear direction by driving means such as an electric motor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is known an actuator that reciprocates an output shaft in the axial direction by, for example, rotating an electric motor, which is a drive source, forward and backward. This actuator, for example, drives a feed nut supported on its housing in forward and reverse rotation, and causes a feed screw screwed into the feed nut to reciprocate linearly. Then, the output shaft integrated with the feed screw is caused to reciprocate linearly, thereby causing the operated portion connected to the tip of the output shaft to reciprocate linearly.
[0003]
[Problems to be solved by the invention]
By the way, there is a case where it is desired to reciprocate an operated member that swings like a lever of a link mechanism using such an actuator. However, with an actuator that only moves the output shaft back and forth, the operated member such as a lever cannot be swung back and forth.
[0004]
Further, in an actuator that drives the output shaft to reciprocate linearly, fluid such as water may enter the main body case from between the output shaft and the opening extending from the opening provided in the main body case. If water intrudes into the main body case, there is a possibility that troubles such as rusting occur in the bearing of the output shaft, the rotor bearing of the electric motor, or the electric motor itself.
[0005]
The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide an actuator capable of reciprocatingly swinging a member to be operated by an output shaft capable of reciprocating linearly. It is to provide.
[0006]
A second object is to provide an actuator that can make it difficult for fluid to occur inside the main body case in addition to the first object.
[0007]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, the invention according to claim 1 is an electric drive means, a base shaft that is reciprocally driven by the electric drive means, and swings around the base end side with respect to the end portion of the base shaft. An output shaft connected to the front end of the main body case and extending to the outside from the opening that opens to the outer surface of the main body case;Provided integrally with the output shaft on the base shaft side with respect to the opening,Output shaftAnd openBetween the mouth and the fluid that has entered the main body case.By interfering with movementFluid entry restriction that restricts entry to the base shaft sideElementThe main point is that
[0008]
According to the first aspect of the present invention, the output shaft having the base end connected to the end of the base shaft that is driven to reciprocate linearly swings around the base end. Therefore, whether the operated member is linearly operated or the operated member is swingable, if the tip of the output shaft is pivotally connected to the operated member and the base shaft is reciprocated linearly, The operated member moves straight or swings through the shaft.
[0009]
  Also,The fluid that has entered the interior through the gap between the output shaft and the opening is prevented from moving by the fluid intrusion restricting means, and is prevented from entering the base shaft.Accordingly, it is difficult for the fluid that has entered from the outside to reach the connecting portion of the base shaft and the output shaft, the support portion of the base shaft, and the electric drive means that are liable to be troubled by the fluid. As a result, it is possible to make it difficult for troubles caused by fluid entering from the outside to enter the connecting portion of the base shaft and the output shaft, the support portion of the base shaft, the electric drive means, and the like.
[0010]
  The invention according to claim 2 is the invention according to claim 1,The fluid intrusion limiting member is formed in a size that covers the opening in the axial direction of the output shaft.This is the gist.
[0011]
  According to the invention described in claim 2, in addition to the operation of the invention described in claim 1,The fluid that has entered the main body through the opening and the output shaft is more reliably restricted from entering the base shaft by the fluid intrusion restricting member.
[0012]
  According to a third aspect of the present invention, in the invention of the second aspect, the output shaft side of the bearing that supports the base shaft on the output shaft side is smaller than the fluid intrusion limiting member on the outer peripheral side of the base shaft. The gist is that a peripheral wall having an outer diameter is formed.
  According to the invention described in claim 3, in addition to the operation of the invention described in claim 2, in the unlikely event that the fluid that has passed through the side of the fluid ingress restricting member and has entered the base shaft side, Further, the penetration into the electric drive means side through the bearing is limited.
  Claim4The invention described in claim 1Any one of Claim 3In the invention described in,PreviousIt is formed so as to cover the opening from the outside and has an insertion hole through which the output shaft is inserted, and by restricting the fluid from the outside to the opening, it passes between the output shaft and the opening. Fluid blocking member for restricting intrusion of fluid into the main body caseFurther equippedThis is the gist.
[0013]
  Claim4According to the invention described in claim 1,Any one of Claim 3In addition to the operation of the invention described in (1), the fluid that has flown from the outside toward the opening is blocked by the fluid blocking member, and the intrusion into the main body case from between the opening and the output shaft is limited.
[0014]
  Claim5The invention described in claim 14The fluid blocking member is formed so that the output shaft abuts on the inner peripheral surface of the insertion hole when the output shaft swings, and is elastically deformed by a force applied from the output shaft. The gist is that the elastic member allows the output shaft to swing.
[0015]
  Claim5According to the invention described in claim4In addition to the operation of the invention described in (1), since the opening area of the insertion hole through which the output shaft is inserted can be made smaller than the range through which the output shaft passes when swinging, the fluid that has flown from the outside toward the opening However, it is more reliably blocked by the elastic member, and the arrival at the opening is more reliably limited.
[0016]
  Claim6The invention described in claim 15The gist of the invention is that the elastic member is formed to seal between the insertion hole and the output shaft and to seal the opening.
[0017]
  Claim6According to the invention described in claim5In addition, the elastic member prevents the fluid from reaching the opening side from the outside and prevents the body case from entering between the opening and the output shaft.
[0018]
  Claim7The invention described in claim 1 to claim 16In the invention described in any one of the above, the gist is that the opening is formed in a shape that matches the shape of the range through which the output shaft passes.
[0019]
  Claim7According to the invention described in claim 1 to claim 16In addition to the action of the invention described in any one of the above, the gap between the opening and the output shaft is as large as necessary for the output shaft to oscillate. Fluid is blocked by the peripheral portion of the opening, and entry from the opening to the inside is limited.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment of the present invention will be described below with reference to FIGS.
[0021]
As shown in FIG. 1, the actuator 10 includes a body 11, a stepping motor (hereinafter simply referred to as a motor) 12 as an electric drive unit, a base shaft 14, a coupling mechanism 15, an output shaft 16, and the like.
[0022]
The motor 12 is a permanent magnet (PM) type, and its motor case 17 is fixed to the body 11. An excitation coil 18 that forms a stator is provided inside the motor case 17. A drive current is supplied to each excitation coil 18 from the outside in a predetermined excitation sequence via an electrical connector 19 fixed to the body 11.
[0023]
The motor 12 includes a shaft portion 23 and a permanent magnet that are rotatably supported by a bearing 21 supported by the motor case 17 and a bearing 22 supported by a columnar first recess 11 a provided in the body 11. The rotor which consists of 24 is provided. The shaft portion 23 is rotatably supported by both the bearings 21 and 22, and the cylindrical permanent magnet 24 is fixed in a state of being fitted on the shaft portion 23.
[0024]
The shaft portion 23 includes an inner cylinder 25 and an outer cylinder 26 combined in the axial direction. A female screw hole 27 is formed in the inner peripheral surface of the inner cylinder 25. The permanent magnet 24 is fitted on the outer cylinder 26.
[0025]
The rotor composed of the shaft portion 23 and the permanent magnet 24 is urged toward the bearing 21 by the compression coil spring 28 provided in the first recess 11 a of the body 11 via the annular member 29 that abuts the bearing 22. Yes. This is to prevent the position in the axial direction from fluctuating even when vibration is applied to the actuator 10 from the outside.
[0026]
The body 11 is provided with a substantially cylindrical second recess 11b on the opposite side to the first recess 11a. The second recess 11b is provided such that its axis coincides with the axis of the first recess 11a. A through hole 11c is provided between the first recess 11a and the second recess 11b, and a square frame bearing 30 is provided in the through hole 11c.
[0027]
The base shaft 14 is supported by the female screw hole 27 and the bearing 30 so as not to rotate around its axis and to be displaceable in the axial direction. The base shaft 14 includes a feed screw portion 32 that is screwed into the female screw hole 27 and a plate-like shaft portion 33 that is supported by the bearing 30 so as not to rotate around the axis line and to be movable in the axial direction.
[0028]
The output shaft 16 has a base end connected to an end portion of the base shaft 14 and a distal end side extending to the outside. The base shaft 14 and the output shaft 16 are coupled by the coupling mechanism 15 disposed in the second recess 11b. The output shaft 16 is coupled to the coupling mechanism 15 by press-fitting a columnar protrusion 36 provided at the base end thereof. As shown in FIG. 4, a connecting portion 37 connected to a lever L as an external member to be operated by the actuator 10 is provided at the tip of the output shaft 16. The connecting portion 37 is formed in a plate shape, and is provided with a connecting hole 37a for pin connection to the lever L.
[0029]
The coupling mechanism 15 is a so-called ball joint, and is fixed to the base portion of the output shaft 16 and the ball portion 38 provided integrally with the end portion of the shaft portion 33 of the base shaft 14 as shown in FIGS. The mounting portion 39 and the fixing spring 40 are included.
[0030]
The mount portion 39 includes a substantially cylindrical base portion 41 to which the protrusion 36 is screwed, and a substantially block-shaped ball engaging portion 42 with which the ball portion 38 is engaged. The ball engaging portion 42 includes a ball accommodating portion 43 for engaging the ball portion 38. The ball accommodating portion 43 accommodates the ball portion 38 in the ball accommodating portion 43 from an opening provided on one of its peripheral surfaces, and the accommodated ball portion 38 is rotated in all directions with respect to the axis of the output shaft 16. Hold as possible.
[0031]
The fixing spring 40 is made of a leaf spring formed in a “U” shape, and a locking portion 40b (shown in FIG. 2) is formed at each end of the paired wing portions 40a. The fixing spring 40 is assembled to the ball engaging portion 42 from the peripheral surface side where the ball accommodating portion 43 opens, and each locking portion 40b is elastically sandwiched between the wing portions 40a. Is locked to the opposite peripheral surface. At this time, the fixing spring 40 abuts on the ball portion 38 and is held in the ball housing portion 43.
[0032]
The base shaft 14 and the output shaft 16 are connected by the ball portion 38 engaging with the ball housing portion 43. The output shaft 16 is connected to the base shaft 14 by the connecting mechanism 15, so that the output shaft 16 extends and retracts as the base shaft 14 reciprocates straight. At the same time, the output shaft 16 can be rotated relative to the ball portion 38 in all directions so that the output shaft 16 follows the swinging motion of the pin-coupled lever L as shown by the two-dot chain line in FIG. Swing.
[0033]
The second recess 11b is formed with a cylindrical peripheral wall 44 formed so as to cover the outer peripheral side of the ball portion 38 of the coupling mechanism 15 disposed at a position close to the bottom surface of the second recess 11b. .
[0034]
An annular plate-shaped plate cup 45 as a fluid intrusion restricting means and a fluid intrusion restricting member is fixed to the base 41 of the mount portion 39 in a state of being fitted. The plate cup 45 includes a substantially cylindrical body 45a that is externally fitted to the base 41, and an annular recess 45b provided at an end of the body 45a on the ball engaging portion 42 side. The annular recess 45b has an outer diameter R1 larger than the inner diameter R2 of the peripheral wall 44. The annular recess 45b is formed in a circumferential groove shape that opens toward the output shaft 16 side.
[0035]
On the other hand, an end cap 46 as a main body case is fixed to the body 11 so as to cover the opening of the second recess 11b in a state where the output shaft 16 is penetrated. As shown in FIGS. 3A and 3B, the end cap 46 is formed so as to be folded back from a substantially conical cylindrical outer cylinder portion 46 a fixed to the body 11 and an end portion of the outer cylindrical portion 46 a. And a substantially conical cylindrical inner cylinder portion 46b. And the opening part 46c which the output shaft 16 penetrates is formed in the edge part of the inner cylinder part 46b. In the present embodiment, the opening 46c is formed in a circular shape having an inner diameter R3 that allows the output shaft 16 to swing in all directions. An inner diameter R3 of the opening 46c is smaller than an outer diameter R1 of the annular recess 45b of the plate cup 45. Accordingly, the plate cup 45 restricts the intrusion to the base shaft 14 side by preventing further upward movement of the water that has entered the inside from the opening 46c of the end cap 46. Furthermore, the end cap 46 includes a plurality of drain holes 46d at the bottom of an annular groove formed by the outer cylinder part 46a and the inner cylinder part 46b. Each drain hole 46d naturally discharges the water accumulated at the bottom of the end cap 46 in a state where the actuator 10 is installed in the posture shown in FIG.
[0036]
A compression coil spring 47 that biases the plate cup 45 toward the bottom surface of the second recess 11b is interposed between the annular recess 45b of the plate cup 45 and the outer cylinder 46a and the inner cylinder 46b of the end cap 46. Has been. The compression coil spring 47 urges the base shaft 14 toward the feed screw portion 32 via the coupling mechanism 15 to which the plate cup 45 is fixed.
[0037]
Next, the operation of the actuator configured as described above will be described.
As shown in FIG. 4, the actuator 10 is used in a state in which the base shaft 14 is substantially vertical and the output shaft 16 is disposed below the base shaft 14.
[0038]
When a drive current is supplied to the excitation coil 18 in a predetermined excitation sequence so as to drive the motor 12 in the normal direction, the rotor rotates by a rotation angle corresponding to the number of steps commanded by this drive current. Then, the feed screw portion 32 is linearly driven so as to extend from the female screw hole 27 by the rotation of the shaft portion 23, and the base shaft 14 moves straight to the second recess 11b side by the amount of displacement corresponding to the same number of steps. As a result, the output shaft 16 extends from the body 11 by a displacement corresponding to the same number of steps.
[0039]
On the contrary, when the drive current is supplied to the exciting coil 18 so as to drive the motor 12 in the reverse direction from the state where the output shaft 16 is extended, the rotor rotates in the reverse direction by the rotation angle corresponding to the commanded number of steps. To do. Then, the feed screw portion 32 is linearly driven so as to be immersed in the female screw hole 27 by the rotation of the shaft portion 23, and the base shaft 14 is linearly moved to the first recess 11 a side by the amount of displacement corresponding to the same number of steps. As a result, the output shaft 16 is immersed in the body 11 by a displacement amount corresponding to the same number of steps.
[0040]
At this time, the output shaft 16 moves the lever L pin-connected to the connecting portion 37 while swinging around the base end side as shown by a two-dot chain line in FIG. Make reciprocating rocking motion.
[0041]
By the way, when water is applied to the actuator 10 from below, the water that has entered from the opening 46c hits the annular recess 45b of the plate cup 45 formed at the outer diameter R1 larger than the inner diameter R3 of the opening 46c. Access to the upper side is restricted. At this time, since the annular recess 45b is formed so as to open downward, the water that has struck the lower surface of the annular recess 45b is less likely to splash laterally. For this reason, the water hitting the annular recess 45b is more reliably restricted from reaching upward.
[0042]
Further, a peripheral wall 44 having an inner diameter R2 smaller than the outer diameter R1 of the annular recess 45b of the plate cup 45 is provided around a through hole 11c through which the base shaft 14 is inserted and communicated with the inside of the motor 12. For this reason, the water that passes through the side of the annular recess 45b and reaches the upper side of the annular recess 45b is prevented from reaching the through hole 11c by the peripheral wall 44. As a result, even if water applied from below to the actuator 10 reaches above the annular recess 45b, it does not reach the through hole 11c, and the possibility of reaching the motor 12 side from the through hole 11c is extremely low.
[0043]
According to the embodiment described in detail above, the following effects can be obtained.
(1) In this embodiment, the output shaft 16 is connected to the end portion of the base shaft 14 that is driven to reciprocate linearly so as to be swingable around the base end side. Therefore, the operated member such as the lever L can be reciprocally swung by the output shaft 16 capable of reciprocating linearly.
[0044]
At this time, since the output shaft 16 swings, no bending moment is applied from the lever L to the base shaft 14 that moves straight, and no excessive force is applied to the base shaft 14, the shaft portion 23, the bearing 30, and the like. Further, it is not necessary to provide a special engagement hole such as a long hole in the connection portion 37 as in the case where the lever L is swung by a conventional output shaft that does not swing.
[0045]
(2) In addition, in the present embodiment, a plate provided with an annular recess 45b having an outer diameter R1 larger than the inner diameter R3 of the opening 46c of the end cap 46 at the base end of the output shaft 16 inside the end cap 46. The cup 45 was fixed integrally. Therefore, even when water that has been applied to the actuator 10 from below in a state where the output shaft 16 is directed downward enters the inside through the opening 46c, the plate cup 45 prevents the plate cup 45 from reaching further upward. As a result, even if the water has entered the inside vigorously, it becomes difficult to reach the bearing 22, the exciting coil 18 and the like constituting the motor 12 from the through hole 11c, and there is a possibility that rust is generated in each of these constituent members. Lower. Therefore, troubles such as malfunctions that occur in the motor 12 due to water entering from the outside can be prevented as much as possible.
[0046]
(3) In addition, in the present embodiment, the annular recess 45b of the plate cup 45 is formed in a circumferential groove shape that opens toward the distal end side of the output shaft 16, so that the water hitting the annular recess 45b from below is upward. It is hard to scatter. Therefore, the water reaching the upper part of the annular recess 45b is more reliably restricted, and the water reaching the bearing 30 is more reliably restricted.
[0047]
(4) In addition, in the present embodiment, the outer diameter R1 of the annular recess 45b of the plate cup 45 fixed to the output shaft 16 around the opening on the output shaft 16 side of the through hole 11c through which the base shaft 14 is inserted is smaller. A peripheral wall 44 having an inner diameter R2 was provided. Therefore, even if the water that has vigorously entered the inside through the opening 46c passes the side of the annular recess 45b and reaches the upper side, the water hits the peripheral wall 44 and is prevented from reaching the through hole 11c. As a result, even water that could not be prevented by the plate cup 45 does not reach the bearing 22, the excitation coil 18, and the like that constitute the motor 12 from the through hole 11 c, and rust is generated in each of these constituent members. There is nothing.
[0048]
(5) Further, in the present embodiment, the end cap 46 that closes the second recess 11b that houses the coupling mechanism 15 is provided, and the conical inner cylinder portion 46b whose inner diameter becomes smaller toward the inner side is provided on the end cap 46. And the opening part 46c was provided in the upper end of this inner cylinder part 46b. Therefore, it is difficult for water that has been vigorously applied to the actuator 10 from below to enter the inside through the opening 46c. As a result, the water that vigorously enters the inside is restricted, so that it is possible to more reliably prevent the occurrence of trouble due to the water that has entered from the outside.
[0049]
(6) In this embodiment, the water accumulated in the groove in the state where the actuator 10 is installed at the bottom of the annular groove formed by the outer cylinder 46a and the inner cylinder 46b of the end cap 46. A water drain hole 46d for naturally discharging water was provided. Therefore, the water that has entered from the opening 46c does not collect in the groove, so even if vibration is applied to the actuator 10 from the outside, the water accumulated in the groove does not jump upward and reach the through hole 11c. .
[0050]
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment is different from the first embodiment only in that the actuator 10 of the first embodiment is assembled with a fluid ingress restricting means, a fluid blocking member, and a rubber cover 50 as an elastic member. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only the rubber cover 50 will be described in detail.
[0051]
As shown in FIG. 5, the rubber cover 50 is formed so as to cover the end cap 46 from the outside. As shown in FIGS. 6A and 6B, the rubber cover 50 is formed with substantially the same thickness, and the upper side thereof is a substantially conical cylindrical outer fitting portion 50a whose diameter gradually decreases toward the lower side. The lower side has a substantially conical cylindrical opening end 50b whose diameter gradually increases as it goes downward. Inside the opening end 50b is an insertion hole 50c for allowing the output shaft 16 to pass therethrough.
[0052]
The rubber cover 50 is fixed so that the outer fitting portion 50a is fitted on the end cap 46, and covers the opening 46c from the outside. And the front end side of the output shaft 16 is extended outside from the insertion hole 50c. The connecting portion 37 is disposed outside the rubber cover 50.
[0053]
The rubber cover 50 is formed so as to contact the inner peripheral surface of the insertion hole 50c when the output shaft 16 swings. The rubber cover 50 is elastically deformed by the force applied from the output shaft 16 to swing the output shaft 16. Allow.
[0054]
Therefore, the rubber cover 50 restricts the water that enters the main body through the space between the opening 46c and the output shaft 16 by restricting the water applied to the opening 46c from the outside.
[0055]
According to the embodiment described above in detail, the effects described in (1) to (6) in the first embodiment and the effects described below can be obtained.
(1) In the present embodiment, the rubber cover 50 that extends the output shaft 16 to the outside from the insertion hole 50c with the opening 46c covered from the outside restricts water applied to the opening 46c from the outside. Therefore, the water that has rushed to the actuator 10 from below is blocked by the rubber cover 50, and the arrival at the opening 46c is more reliably restricted. As a result, it is possible to more reliably limit the water that enters the inside of the main body from the opening 46c, and it is possible to more reliably prevent the trouble that occurs in the motor 12 due to the water that has entered from the outside.
[0056]
(2) In addition, in the present embodiment, the rubber cover 50 is brought into contact with the inner peripheral surface of the insertion hole 50 c when the output shaft 16 swings, and is elastically deformed by the force applied from the output shaft 16. Accordingly, since it is not necessary to increase the opening area of the insertion hole 50c sufficiently so that the output shaft 16 does not come into contact when swinging, water applied from the outside hardly reaches the opening 46c through the insertion hole 50c. .
[0057]
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIGS. The present embodiment differs from the first embodiment only in that the fluid boot restricting means, the fluid blocking member, and the rubber boot 60 as an elastic member are assembled to the actuator 10 of the first embodiment. Accordingly, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and only the rubber boot 60 is described in detail.
[0058]
As shown in FIG. 8, the rubber boot 60 is provided so as to be fitted on the end cap 46. As shown in FIGS. 7 (a) and 7 (b), the rubber boot 60 has an upper fitting portion 60a that gradually decreases in diameter toward the lower portion, and a lower portion that is a bellows portion 60b and a fixed end 60c. Yes. Inside the fixed end 60c is an insertion hole 60d through which the output shaft 16 is inserted.
[0059]
The rubber boot 60 is fixed so that the outer fitting portion 60a is fitted to the end cap 46, and covers the opening 46c from the outside. The output shaft 16 is extended to the outside from the insertion hole 60d in a state where the fixed end 60c is engaged with the circumferential groove 16a provided at the tip thereof. At this time, the space between the output shaft 16 and the insertion hole 60d is sealed. The connecting portion 37 is disposed outside the rubber boot 60.
[0060]
Further, in the rubber boot 60, when the output shaft 16 extends / immerses, the bellows portion 60b expands and contracts, and the fixed end 60c remains engaged with the circumferential groove 16a. Further, when the output shaft 16 swings, the bellows portion 60b is elastically deformed by the force applied from the output shaft 16 to allow the output shaft 16 to swing.
[0061]
Accordingly, the rubber boot 60 prevents water from entering the main body through the space between the opening 46c and the output shaft 16.
According to the embodiment described above in detail, the effects described in (1) to (6) in the first embodiment and the effects described below can be obtained.
[0062]
(1) In the present embodiment, the rubber boot 60 that seals between the output shaft 16 and the insertion hole 60d and seals the opening 46c blocks water applied to the opening 46c from the outside. Accordingly, water flying from below is blocked by the rubber boot 60 and prevented from reaching the opening 46c. As a result, the intrusion of water from the opening 46c to the inside is prevented, so that it is possible to prevent the trouble that occurs in the motor 12 due to the water that has entered from the outside.
[0063]
(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIGS. This embodiment is different from the first embodiment only in that the end cap 46 of the first embodiment is changed to an end cap 70. Accordingly, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only the end cap 70 will be described in detail.
[0064]
As shown in FIGS. 11A and 11B, the end cap 70 includes an outer cylinder portion 70 a and an inner cylinder portion 70 b similar to the end cap 46. An opening 70c through which the output shaft 16 is inserted is formed at the end of the inner cylindrical portion 70b. In the present embodiment, the opening 70c is substantially matched to the shape of the range that passes when the output shaft 16 swings on the same plane so as to allow only the swing of the output shaft 16 on a specific plane. It is formed in an oval shape. A plurality of drain holes 70d are formed at the bottom of the annular groove formed by the outer cylinder part 70a and the inner cylinder part 70b.
[0065]
As shown in FIGS. 9 and 10, the end cap 70 is fixed to the body 11 such that the length direction of the opening 70 c coincides with the direction in which the output shaft 16 swings (the G direction shown in FIG. 10). Yes. Therefore, the end cap 70 more effectively prevents water from entering the main body through the space between the opening 46 c and the output shaft 16 than the end cap 46 from the outside.
[0066]
According to the embodiment described above in detail, the effects described in (1) to (6) in the first embodiment and the effects described below can be obtained.
(1) In the present embodiment, the shape of the opening 70c is made to match the shape of the range through which the output shaft 16 passes. Accordingly, since the gap between the opening 70c and the output shaft 16 is as large as necessary for the output shaft 16 to oscillate, the water that enters the inside through the opening 70c from the outside is more reliably limited. The As a result, it is possible to more reliably prevent troubles that occur in the motor 12 and the like due to water entering from the outside.
[0067]
(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. The present embodiment is different from the first embodiment only in that a water blocking plate 80 is provided in the first embodiment. Accordingly, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Only the water blocking plate 80 will be described in detail.
[0068]
As shown in FIG. 12, the water blocking plate 80 is made of, for example, a metal plate extending with the same width, and is fixed to the body 11 of the actuator 10 together with the motor 12. The water blocking plate 80 extends from the motor 12 side to the end cap 46, and is formed so that its tip 81 covers the opening 46c from the outside in a state where the output shaft 16 is inserted. As shown in FIG. 13, the distal end portion 81 is provided with an insertion hole 81 a through which the output shaft 16 is inserted. The insertion hole 81a is formed in a long hole that matches the range through which the output shaft 16 passes when swinging only on a specific plane. As a result, the water blocking plate 80 prevents the opening 46c from being splashed from the outside.
[0069]
According to this embodiment described in detail above, the effects described in (1) to (6) in the first embodiment and the effects described below can be obtained.
(1) In this embodiment, the water blocking plate 80 that covers the opening 46c by inserting the output shaft 16 through the insertion hole 81a at a position away from the opening 46c is provided. Therefore, the water that has flown into the actuator 10 from below is blocked by the water blocking plate 80, and the arrival at the opening 46c is restricted. As a result, the water that enters the inside from the opening 46c is limited, so that it is possible to more reliably prevent the trouble that occurs in the motor 12 due to the water that has entered from the outside.
[0070]
Further, the water shield plate 80 may be used also as a heat shield plate provided to protect the actuator 10 from the heat of a nearby high temperature source, for example. In this case, it is not necessary to add a new part.
[0071]
Hereinafter, embodiments other than the above-described embodiment will be listed.
In the above embodiment, a compression coil spring that urges the output shaft 16 in the extending direction may be provided between the body 11 and the annular member 29. In this case, the annular recess 45b of the plate cup 45 may be formed so as to open to the base shaft 14 side.
[0072]
In the above embodiment, the electric drive means is not limited to a rotary motor that requires a feed mechanism, and may be a linear stepping motor that directly drives the output shaft linearly.
[0075]
  Hereinafter, the technical idea grasped from each embodiment mentioned above is described with the effect.
  ・  PreviousThe insertion hole is formed in a shape that matches the shape of the range through which the output shaft passes when it swings.TheAccording to such a configuration, the fluid that reaches the opening through the insertion hole and the output shaft is restricted, and the fluid that enters between the opening and the output shaft and enters the inside of the main body is restricted. .
[0076]
  ・  SaidA method of using an actuator, wherein the actuator is used in a posture in which the base shaft is disposed in a substantially vertical direction and the output shaft is disposed below the base shaft. According to such a configuration, it is possible to prevent the fluid flying mainly from below from entering the inside of the main body with respect to the actuator.
[0077]
  ・  PreviousThe main body is provided with fluid drain holes (drain holes 46d and 70d) for naturally discharging water that has entered the inside through the opening to the outside in a posture in which the actuator is installed. According to such a configuration, it is possible to prevent the fluid that has entered and accumulated inside the main body from bouncing due to vibrations that the actuator receives from the outside and not enter the inside of the main body.
[0078]
【The invention's effect】
  eachClaimIn termsAccording to the described invention, the operated member can be directly reciprocated with the output shaft capable of reciprocating linearly. In addition, the intrusion of fluid into the main body case through the opening extending the output shaft is restricted, or the intrusion of the fluid that has entered the main body case from the opening into the inner side is restricted, and the main body is restricted. It is possible to prevent troubles due to fluids from occurring inside the case.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an actuator of a first embodiment.
FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG.
3A is a front view showing an end cap, and FIG. 3B is a sectional view taken along line BB in FIG. 3A.
FIG. 4 is a schematic diagram of an actuator showing an operating state.
FIG. 5 is a schematic cross-sectional view showing an actuator of a second embodiment.
6A is a front view of a rubber cover, and FIG. 6B is a cross-sectional view taken along the line CC of FIG.
7A is a front view of a rubber boot, and FIG. 7B is a sectional view taken along line DD of FIG.
FIG. 8 is a schematic cross-sectional view showing an actuator according to a third embodiment.
FIG. 9 is a schematic cross-sectional view showing an actuator according to a fourth embodiment.
FIG. 10 is a schematic front view of the same.
11A is a front view of the end cap, and FIG. 11B is a sectional view taken along line EE of FIG.
FIG. 12 is a schematic side view showing the actuator of the fifth embodiment.
FIG. 13 is an F view of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Actuator, 12 ... Stepping motor as electric drive means, 14 ... Base shaft, 16 ... Output shaft, 45 ... Plate cup as fluid intrusion restricting means and fluid ingress restricting member, 46 ... End cap as main body case, 46c ... Opening 50, fluid intrusion restricting means, rubber cover as fluid blocking member and elastic member, 50c ... insertion hole, 60 ... fluid intrusion restricting means, rubber boot as fluid blocking member and elastic member, 60d ... insertion hole, 70c ... Opening portion, 80 ... water intrusion restricting means and water blocking plate as fluid blocking member, 81a ... insertion hole.

Claims (7)

Electric drive means (12);
A base shaft (14) driven to reciprocate linearly by the electric drive means (12);
The base shaft (14) is connected to the end portion of the base shaft (14) so as to be swingable around the base end side. An output shaft (16),
Than said opening (46c) provided integrally with the output shaft (16) in said base shaft (14) side, the main body case through between said output shaft (16) to open the mouth portion and (46c) ( the base shaft (14) has a fluid ingress restricting member for restricting the entry of the side (4 5) actuator by interfering with the movement of the entering fluid into the 46). 2. The actuator according to claim 1, wherein the fluid intrusion limiting member is formed in a size (outside diameter R <b> 1) that covers the opening in the axial direction of the output shaft . On the output shaft side of the bearing (30) that supports the base shaft on the output shaft side, a peripheral wall (44) having an outer diameter (R2) smaller than that of the fluid intrusion limiting member is formed on the outer peripheral side of the base shaft. The actuator according to claim 2 . The opening (46c) is formed so as to cover from the outside and has an insertion hole (60d, 81a) through which the output shaft (16) is inserted, and restricts fluid applied to the opening (46c) from outside And a fluid blocking member (50, 60, 80) for restricting the ingress of fluid into the main body case (46) between the output shaft (16) and the opening (46c). The actuator as described in any one of Claims 1-3. The fluid blocking member is formed so that the output shaft (16) abuts against the inner peripheral surface of the insertion hole (50c, 60d) when the output shaft (16) is swung, and by the force applied from the output shaft (16). The actuator according to claim 4, wherein the actuator is an elastic member (50, 60) which is elastically deformed to allow the output shaft (16) to swing . The actuator according to claim 5 , wherein the elastic member (60) is formed to seal between the insertion hole (60d) and the output shaft (16) and to seal the opening (46c). . The said opening part (46c, 70c) is formed in the shape match | combined with the shape of the range which passes, when this output shaft (16) rock | fluctuates. Actuator.

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