JP2004297870A - Electromagnetic actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer an inexpensive electromagnetic actuator which enhance the waterproofness of a coil by applying a sealing means for coil to a coil assembly, and besides, enables a reduction in the number of parts and manhour in assembly by the integration of the sealing means and a coupler. <P>SOLUTION: A small strut 38a, into which the proximal end part of a coupler terminal 40 is to be inserted and coupled, is molded integrally at one end face of a bobbin 38, and the lead wire 39a of a coil 39 wrapped on this small strut 38a is connected to the coupler terminal 40, and a coupler 42, which projects outward in the radial direction of a coil assembly 34, holding the coupler terminal 40, and a projection 42a, which projects from the end face of the coil cover 41, wrapping the small strut 38a, are formed integrally with a coil cover 41 which is made around the coil 39 and the bobbin 38 so as to seal the coil 39 to the bobbin 38. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a stationary core supported on a bottom wall of a housing made of a magnetic material, a movable core opposed to the fixed core via an air gap to drive a movable member, and surrounding the fixed and movable cores. A coil assembly in which a coil is wound around a bobbin supported by the housing.
[0002]
[Prior art]
Such an electromagnetic actuator is already known, for example, as disclosed in Patent Document 1 below.
[0003]
[Patent Document 1]
JP 2001-1765 A
[Problems to be solved by the invention]
In such a conventional electromagnetic actuator, since the coil assembly housed in the housing is not provided with a coil sealing means, it cannot be said that the waterproofness is good, and the lead wire connected to the coil must be outside the housing. Since it was pulled out and connected to the terminal of the coupler, it was necessary to provide a coupler holder for holding the coupler in the housing or a member adjacent thereto, and the number of parts and the number of assembly steps were large, and it was difficult to reduce the cost. .
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a coil sealing means to a coil assembly so that the coil has high waterproofness. It is another object of the present invention to provide an inexpensive electromagnetic actuator which can reduce the number of assembly steps.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a fixed core supported on a bottom wall of a housing made of a magnetic material, a movable core opposed to the fixed core via an air gap to drive a movable member, and A coil assembly wound around a bobbin supported by the housing surrounding the fixed and movable cores, and a base end of a coupler terminal is insert-coupled to one end surface of the bobbin. A small supporting column is integrally formed, and a lead wire of the coil wound around the small supporting column is connected to the coupler terminal, and is formed around the coil and the bobbin so as to seal the coil with the bobbin. A coil cover for holding the coupler terminal and projecting radially outward of the coil assembly; and a coil covering the small support and covering an end surface of the coil cover. And a projection projecting to the first, characterized in that integrally formed.
[0007]
According to the first feature, the coil and the coil cover are formed on the outer periphery of the bobbin so as to seal the coil on the bobbin, so that the waterproofness of the coil can be improved.
[0008]
In addition, since the coil cover is formed integrally with a coupler that holds the coupler terminal and protrudes outward in the radial direction, there is no need for a lead wire connected to the coil or a coupler holder that supports the coupler, reducing the number of parts and assembly steps. Therefore, cost can be reduced.
[0009]
On one end surface of the bobbin, a small column for insert-connecting the base end of the coupler terminal is integrally formed. Since the projecting portion protruding from the end face of the cover is formed integrally with the coil cover together with the coupler, the coil lead, the coil cover, the coupler and the projecting portion can be reliably prevented by winding the lead of the coil around the small column. Part molding can be performed.
[0010]
In addition to the first feature, in addition to the first feature, the coupler is exposed to the outside through an opening provided from a peripheral wall to a bottom wall of the housing, and the projecting portion is adjacent to the bottom wall. A second feature resides in the arrangement in the opening.
[0011]
According to the second feature, it is not necessary to provide a housing space for the projecting portion in the housing, and the projecting portion does not protrude from the outer surface of the housing, so that the actuator can be made compact.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below based on preferred embodiments of the present invention shown in the accompanying drawings.
[0013]
1 is a longitudinal sectional view of an active vibration isolating support device provided with the electromagnetic actuator of the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 1 is an enlarged view of a part 4 in FIG. 1, FIG. 5 is a view as viewed in the direction of the arrow 5 in FIG. 4, FIG. 6 is a view as viewed in the direction of the arrow 6 in FIG. 4, FIG. FIG. 4 is an exploded partial longitudinal side view of a connecting bolt, a lock screw, and the like.
[0014]
First, in FIG. 1, an active vibration isolating support device M including the electromagnetic actuator 31 of the present invention is interposed between the vehicle and a vehicle body frame F in order to elastically support the engine E in a vehicle.
[0015]
The active vibration isolator M has a substantially axially symmetric structure with respect to the axis L, and includes a plate-shaped mounting bracket 11 coupled to the engine E, an inner cylinder 12 welded to the mounting bracket 11, and An outer cylinder 13 coaxially arranged on the outer periphery of the inner cylinder 12, and a first elastic body 14 made of a thick rubber or the like which is vulcanized and bonded to opposing conical surfaces of the inner cylinder 12 and the outer cylinder 13. A first orifice forming member 15, a second orifice forming member 16 and a third orifice forming member 17 are arranged below and vertically integrated with each other below the first elastic body 14. .
[0016]
The first orifice forming member 15 has a disk shape and has an opening 15b at the center thereof. The second orifice forming member 16 has an annular shape with a gutter-shaped cross section having an open upper surface, and is integrated with the first orifice forming member 15 so that the open upper surface is closed by the first orifice forming member 15. Joined. The third orifice forming member 17 also has an annular shape with a gutter-like cross section with an open upper surface, and the third orifice forming member 16 is closed by the second orifice forming member 16 so that the open upper surface is closed by the second orifice forming member 16. They are joined together. The outer peripheral portions of the first and second orifice forming members 15 and 16 are overlapped and integrated with each other, and are fixed to an annular caulking fixing portion 13 a provided continuously below the outer cylinder 13.
[0017]
The outer peripheral surface of an annular second elastic body 18 made of rubber or the like is vulcanized and adhered to the inner peripheral surface of the third orifice forming member 17, and is disposed on the axis L on the inner peripheral surface of the second elastic body 18. Then, the first cap member 19 whose lower surface is opened is vulcanized and bonded. The second cap member 23 and the movable member 20 are sequentially fixed to the first cap member 19 by press-fitting. The lower end of the second cap member 23 is projected below the first cap member 19, and the inner peripheral end of the diaphragm 22 disposed below the second elastic body 18 is formed on the outer peripheral surface of the projected portion. Are vulcanized and adhered. A ring member 21 is vulcanized and bonded to the outer periphery of the diaphragm 22, and the ring member 21 is fixed to the caulking fixing portion 13a together with the outer peripheral portions of the first and second orifice forming members 15, 16. The movable member 20 can move up and down together with the first and second cap members 19 and 23 due to the bending of the second elastic body 18 and the diaphragm 22.
[0018]
Thus, a first liquid chamber 24 in which liquid is sealed is defined between the first elastic body 14 and the second elastic body 18, and a liquid is similarly filled between the second elastic body 18 and the diaphragm 22. A second liquid chamber 25 to be enclosed is defined. These first and second liquid chambers 24 and 25 are communicated with each other via an upper orifice 26 and a lower orifice 27 formed by first to third orifice forming members 15 to 17.
[0019]
The upper orifice 26 is defined between the first and second orifice forming members 15 and 16 for a little less than one round (see FIG. 2), and the partition walls 26a forming both end walls of the upper orifice 26 are first. And between the second orifice forming members 15 and 16. The upper orifice 26 communicates with the first liquid chamber 24 through the through hole 15a of the first orifice forming member 15 on one side of the partition 26a, and communicates with the second orifice forming member 16 on the other side of the partition 26a. It communicates with the lower orifice 27 via 16a.
[0020]
The lower orifice 27 is defined between the second and third orifice forming members 16 and 17 over a little less than one round thereof (see FIG. 3), and the partition walls 27a forming both end walls of the lower orifice 27 are the first. And between the second orifice forming members 15 and 16. The upper orifice 26 communicates with the upper orifice 26 through the through hole 16a on one side of the partition 27a, and the second liquid chamber through the through hole 17a of the third orifice forming member 17 on the other side of the partition 27a. 25. As described above, the first and second liquid chambers 24 and 25 communicate with each other through the upper and lower orifices 26 and 27 connected in series.
[0021]
A cylindrical bracket 28 is further fixed to the caulking fixing portion 13a, and is fixed to the vehicle body frame F, so that the active vibration isolation support device M is attached to the vehicle body frame F. The cylindrical bracket 28 and the outer cylinder 13 constitute a support casing C of the active vibration isolation support device M.
[0022]
An actuator support member 30 is fixed to the cylindrical bracket 28, and an electromagnetic actuator 31 for driving the movable member 20 is supported by the actuator support member 30.
[0023]
In FIG. 4, the actuator 31 includes a bottomed cylindrical housing 32 made of a magnetic material having an open upper surface, and a flange 32 a formed at an upper end thereof is fixed to the actuator support member 30. The housing 32 is a magnetic material, and a fixed core 33, a coil assembly 34, and an upper yoke 35 are sequentially mounted inside the housing 32. The fixed core 33 has a suction surface 33a at its upper part, a positioning shaft 33b protruding at its lower surface, and a stepped flange-like lower yoke 36 formed on the outer periphery. The positioning shaft 33b is pressed into the positioning hole 37 of the bottom wall 32b in close contact with the bottom wall 32b. Thus, the fixed core 33 is fixed to the housing 32.
[0024]
The coil assembly 34 includes a bobbin 38 made of synthetic resin disposed on the outer periphery of the fixed core 33, and a coil 39 wound around the bobbin 38. A small pillar 38a projecting downward is protruded from the outer periphery of the lower flange of the bobbin 38, and the base end of the coupler terminal 40 is insert-coupled to the small pillar 38a when the small pillar 38a is formed. The lead wire 39a of the coil 39 is wound around the small column 38a, and the tip is connected to the coupler terminal 40 by soldering, electric welding, or the like.
[0025]
After connecting the lead wire 39a to the coupler terminal 40, in order to seal the coil 39 to the bobbin 38, a cylindrical coil cover 41 that is in close contact with the upper and lower end surfaces of the bobbin 38 and the outer peripheral surface of the coil 39 is injected with synthetic resin. Molded. At this time, the coil cover 41 holds the coupler terminal 40 and projects outward in the radial direction of the cover 41. The coil 42 covers the small support rod 38a and the lead wire 39a and covers the lower end surface of the cover 41. The protruding portion 42a is integrally formed. The coupler 42 is disposed so as to be exposed to the outside of the housing 32 through an opening 43 provided from the bottom wall 32b to the peripheral wall of the housing 32 (see FIGS. 5 and 6). It is arranged in the opening 43 so as to be adjacent to the bottom wall 32b.
[0026]
An annular seal member 45 is mounted on the upper end surface of the coil assembly 34, particularly on the upper end surface of the coil cover 41. A plurality of sealing ridges 46, 46 concentrically surrounding the fixed core 33 are integrally formed on the lower end surface of the coil assembly 34, particularly on the lower end surfaces of the bobbin 38 and the coil cover 41. An elastic plate 47 is interposed between the lower yoke 36 and the thin outer peripheral portion 36a. The elastic plate 47 is formed of an elastic material such as NBR or silicon rubber.
[0027]
The upper yoke 35 is fixed to the inner peripheral surface of the housing 32 by press-fitting so as to press and hold the coil assembly 34 toward the lower yoke 36. As a result, the sealing member 41 and the elastic plate 47 are compressed, so that the coil assembly 34 is elastically supported between the upper yoke 35 and the lower yoke 36 without play. 39 is improved in waterproofness. In particular, the sealing ridges 46, 46 on the lower end surfaces of the bobbin 38 and the coil cover 41 bite into the upper surface of the elastic plate 47 to further ensure the seal with the elastic plate 47. If rainwater, washing water, or the like that has entered the housing 32 accumulates at the bottom of the housing 32, even if there is poor adhesion between the coil cover 41, the coil 39, and the bobbin 38, not only water will enter the coil 39 but also the inner periphery of the bobbin 38. It is also possible to reliably prevent inundation on the side.
[0028]
A thin cylindrical bearing member 50 is slidably fitted on the inner peripheral surface of the cylindrical portion 35a disposed on the inner periphery of the bobbin 38 of the upper yoke 35. At the upper end of the bearing member 50, an inward flange 50a facing inward in the radial direction is formed, and at the lower end thereof, an outward facing outward flange 50b is integrally formed. 50b is superposed on the thick inner peripheral portion 36b of the lower yoke 36 via an annular elastic plate 51, and a set spring 52 composed of a coil spring is contracted between the outward flange 50b and the fixed core 33. Thus, the bearing member 50 is elastically held on the lower yoke 36, and its vibration is prevented.
[0029]
When the movable core 53 descends toward the fixed core 33, the elastic plate 51 receives the lower end of the movable core 53 in a buffered manner in order to avoid abutment between the two cores 33 and 53, and defines the lower limit thereof. , Also serves as a descent stopper for the movable core 53.
[0030]
A movable core 53 having a suction surface 53a facing the suction surface 33a of the fixed core 33 via an air gap g is slidably fitted to the bearing member 50. The upper end of a connection bolt 55 that loosely penetrates a relatively large diameter through hole 54 that opens into the movable member 20 is screwed into the lower end of the connection bolt 55 around the through hole 54 of the movable core 53. An adjusting nut 56 for supporting the lower end surface is screwed. At this time, a set spring 57 for holding the movable core 53 at a position supported by the adjusting nut 56 is contracted between the movable member 20 and the movable core 53. Thus, the movable core 53 is elastically sandwiched between the adjusting nut 56 screwed to the connecting bolt 55 integrated with the movable member 20 and the set spring 57. A radial ventilation groove 58 communicating with the through hole 54 is formed on an upper end surface of the adjusting nut 56 which is in pressure contact with the movable core 53, and when the movable core 53 moves up and down, air flows in spaces above and below the movable core 53. It is designed to facilitate distribution.
[0031]
Thus, if the screwing position of the adjusting nut 56 with respect to the connecting bolt 55 is advanced or retracted, the vertical position of the movable core 53, that is, the suction surfaces 33 a of the movable core 53 and the fixed core 33, The air gap g between 53a can be adjusted. The adjustment position of the adjustment nut 56 is screwed into the adjustment nut 56 from below, tightened, and fixed by the lock screw 59.
[0032]
As shown in FIGS. 7 and 8, the screw portion of the connection bolt 55 has a normal right-hand thread, whereas the screw portion of the lock screw 59 has a left-hand thread. When the lock screw 59 is tightened by another tool while being held at the predetermined adjustment position by the tool, the torque of the lock screw 59 is transmitted to the connection bolt 55 by friction, and the connection bolt 55 is drawn into the lock screw 59 side. Therefore, it is possible to reliably lock the adjusting nut 56 at the adjusting position.
[0033]
At the center of the fixed core 33, an adjusting work hole 60 for allowing the adjusting nut 56 to enter and exit is provided. The lock screw 59 and the adjusting nut 56 can be operated by a tool inserted into the adjusting working hole 60. It has become. The adjusting hole 60 includes a screw hole 60a and a fitting hole 60c having a diameter larger than that of the screw hole 60a and connected to a lower end of the screw hole 60a via an annular shoulder 60b. On the other hand, the stopper 61 for closing the adjusting work hole 60 has a bottomed cylindrical shape with an open upper end. The screw cylinder 61a screwed into the screw hole 60a while receiving the adjusting nut 56, and the fitting hole 60c. And a bottom portion 61c, and a seal member 64 closely attached to the inner peripheral surface of the fitting hole 60c is mounted on the outer periphery of the flange portion 61b. A polygonal tool engagement projection 62 is formed on the lower surface of the bottom portion 61c.
[0034]
The screw cylinder 61a is screwed into the screw hole 60a and tightened until the flange 61b fitted in the fitting hole 60c abuts the shoulder 60b. Can be closed.
[0035]
An elastic plate 63 is joined to the upper surface of the bottom portion 61c of the plug 61, and the bottom portion 61c receives the lower end of the adjusting nut 56 through the elastic plate 63 so as to regulate the lowering limit of the movable member 20. Has become. However, when the adjusting nut 56 comes into contact with the bottom 61c of the plug 61, after the movable core 53 reaches the above-described lower limit by the lowering of the movable member 20, the movable member 20 further descends while compressing the set spring 57. This is the case.
[0036]
In the bearing member 50, the opposing suction surfaces 33a, 53a of the fixed core 33 and the movable core 53 are all formed in a conical surface so as to define a conical cylindrical air gap g therebetween. The suction surface 53 a of the movable core 53 is arranged so as to surround the suction surface 33 a of the fixed core 33. Accordingly, a relatively large suction force and a relatively long stroke of the movable core 53 can be obtained even in the fixed core 33 and the movable core 53 having relatively small diameters in the bearing member 50.
[0037]
Moreover, since the suction surface 53a of the movable core 53 is formed on the inner peripheral surface side of the core 53, a sufficiently long support span of the movable core 53 by the bearing member 50 is ensured regardless of the suction surface 53a. Therefore, stable lifting of the movable core 53 can be guaranteed. In this case, forming a low friction material layer such as Teflon on the outer peripheral surface of the movable core 53 is effective in obtaining a more stable and smooth lifting and lowering of the movable core 53.
[0038]
The set spring 57 is formed of a coil spring, and is arranged concentrically with the connection bolt 55 by fitting into the large-diameter portion 55a at the base of the connection bolt 55. An annular spring seat 65 made of a steel plate is interposed between the set spring 57 and the movable core 53 to prevent the wear of the movable core 53. The spring seat 65 has inner and outer concentric positioning cylinders 66 and 67 that stand along the inner and outer peripheral surfaces of the set spring 57 from the inner and outer peripheral edges thereof. 67 is formed to be longer than the inner positioning cylinder 66. To facilitate insertion of the set spring 57 between the positioning cylinders 66, 67, funnels 66a, 67a are formed at the upper ends of the positioning cylinders 66, 67. A low friction material layer such as Teflon is formed on at least one of the opposed contact surfaces of the spring seat 65 and the movable core 53 so that the spring seat 65 can slide well on the movable core 53.
[0039]
Referring again to FIG. 1, an electronic control unit U is connected to the coil 39 of the actuator 31 via a coupler 42. The electronic control unit U has a rotation speed sensor Sa for detecting the engine rotation speed, and an active vibration isolation support. The detection signals of the load sensor Sb for detecting the load input to the device M and the acceleration sensor Sc for detecting the acceleration acting on the engine E are input.
[0040]
Next, the operation of this embodiment will be described.
[0041]
When the actuator 31 of the active vibration isolator M is inactive, the first and second liquid chambers 24 and 25 communicating with each other via the upper and lower orifices 26 and 27 are maintained at the same pressure. However, since the pressure receiving area of the first cap member 19 connected to the movable member 20 in the first liquid chamber 24 is larger than the pressure receiving area of the second liquid chamber 25, the difference in the area of the first liquid chamber 24 The downward load multiplied by the pressure acts on the movable member 20, and when the load and the repulsive force of the second elastic body 18 are balanced, the movable member 20 is stopped, and the fixed core 33 and the movable core 20 are stopped. A predetermined initial air gap g is formed between the suction surfaces 33a, 53a.
[0042]
Thus, when low frequency shake vibration is generated in the engine E while the vehicle is running, when the first elastic body 14 is deformed by the load input from the engine E and the volume of the first liquid chamber 24 changes, Liquid flows between the first and second liquid chambers 24 and 25 which are communicated with each other via the upper and lower orifices 26 and 27. As the volume of the first liquid chamber 24 increases or decreases, the volume of the second liquid chamber 25 decreases or expands accordingly. However, the change in the volume of the second liquid chamber 25 is absorbed by the elastic deformation of the diaphragm 22. At this time, since the shapes and dimensions of the upper and lower orifices 26 and 27 and the spring constant of the first elastic body 14 are set so as to exhibit a high spring constant and a high damping force in the frequency range of the shake vibration, Vibration transmitted from the engine E to the vehicle body frame F can be effectively reduced.
[0043]
In such a low-frequency shake vibration region of the engine E, the actuator 31 is kept in an inactive state.
[0044]
When the engine E generates vibration having a frequency higher than the shake vibration, that is, idle vibration or muffled sound vibration generated when the engine E is in an idle state, the upper part connecting the first and second liquid chambers 24 and 25 and The liquid orifices in the lower orifices 26 and 27 are brought into a liquid stick state, and the vibration proof function can be exhibited. In such a case, the actuator 31 is driven to exert the vibration proof function.
[0045]
That is, the electronic control unit U controls energization of the coil 39 of the actuator 31 based on detection signals input from the engine speed sensor Sa, the load sensor Sb, the acceleration sensor Sc, and the like. More specifically, when the engine E is biased downward by vibration and the first elastic body 14 is deformed downward to reduce the volume of the first liquid chamber 24 and increase its hydraulic pressure, the coil 39 is excited. Then, the movable core 53 is sucked toward the fixed core 33. As a result, the movable core 53 descends while deforming the second elastic body 18 to increase the volume of the first liquid chamber 24, thereby suppressing an increase in the pressure of the first liquid chamber 24. The active vibration isolation support device M generates an active support force for preventing transmission of a downward load from the engine E to the vehicle body frame F.
[0046]
Contrary to the above, when the engine E is biased upward to increase the volume of the first liquid chamber 24 and increase the pressure in the chamber 24, the coil 39 is demagnetized and the movable core 53 is released. As a result, the movable core 53 rises due to the repulsive force of the second elastic body 18 and reduces the volume of the first liquid chamber 24, so that a decrease in the pressure of the chamber 24 can be suppressed. The type anti-vibration support device M generates an active support force for preventing transmission of an upward load from the engine E to the vehicle body frame F.
[0047]
During such an operation, when the pressure in the first liquid chamber 24 increases rapidly due to the excessive increase in the downward load from the engine E to the first elastic body 14, and an excessive downward load is applied to the movable member 20, First, the movable member 20 lowers the movable core 53 to its lower limit, that is, until the lower end surface of the core 53 comes into contact with the elastic plate 51 on the thick inner peripheral portion 36b of the lower yoke 36, Thereafter, the set spring 57 is compressed and deformed, and the adjusting nut 56 is separated from the lower surface of the movable core 53, so that the movable member 20 is allowed to move further toward the fixed core 33. Therefore, the excessive load of the movable member 20 is absorbed by the set spring 57, thereby preventing the fixed core 33 and the movable core 53 from contacting each other and preventing the movable core 53 and the elastic plate 51 from being overloaded. Can be secured.
[0048]
If the lowering of the movable member 20 reaches a predetermined amount after the movable core 53 reaches the lowering limit, the adjusting nut 56 is connected to the bottom 61 c of the plug 61 fixed to the fixed core 33 via the elastic plate 63. As a result, an excessive increase in load of the set spring 57 can be suppressed, and an increase in overload on the fixed core 33 and the movable core 53 can be prevented.
[0049]
By the way, the initial air gap g between the suction surfaces 33a and 53a of the fixed core 33 and the movable cores 33 and 53 when the actuator 31 is not operated depends on the characteristics regarding the thrust and displacement of the movable member 20 in the active vibration isolator M. Although it depends, the initial air gap g may not be within the allowable range due to an integrated manufacturing error of each part from the mounting part of the second elastic body 18 to the movable core 53. In such a case, As described above, the initial air gap g can be appropriately and easily adjusted by moving the screwing position of the adjusting nut 56 to the connecting bolt 55 forward and backward. Therefore, by exciting the coil 39, a predetermined thrust and displacement can be applied to the movable member 20 with high accuracy, and the performance of the active vibration isolator M can be improved.
[0050]
In addition, if the adjusting nut 56 is operated to prepare a plurality of types of active vibration isolation support devices M having different initial air gaps g between the fixed core 33 and the movable cores 33 and 53, characteristics corresponding to a plurality of vehicle types are also provided. The active type anti-vibration support device M can be easily obtained, which can contribute to cost reduction.
[0051]
Moreover, since the adjusting nut 56 is formed from the adjusting work hole 60 of the fixed core 33 opened to the outside of the housing 32, after the assembly of the active vibration isolating support device M is completed, regardless of the assembly error of each part, the initial air gap is adjusted. g can be performed accurately.
[0052]
The fixed core 33 becomes hollow by having the adjusting work hole 60, but the positioning shaft 33b integral therewith is press-fitted into the positioning hole 37 of the bottom wall 32b of the housing 32, and the flange-like lower yoke 36 is fitted to the bottom wall. By being in close contact with 32b, the fixed core 33 is strongly reinforced, so that it can sufficiently withstand a contact impact from the movable core 53, and does not cause displacement. Moreover, since the lower yoke 36 effectively increases the magnetic path around the coil assembly 34 in cooperation with the housing 32 and the upper yoke 35, the attraction force between the fixed and movable cores 33, 53 is increased. Can be.
[0053]
On the other hand, the upper limit of the movable core 53 is defined by its upper end abutting on the inward flange 50 a of the bearing member 50. When the movable core 53 abuts against the inward flange 50a, the impact force is transmitted to the set spring 52 via the bearing member 50 and the outward flange 50b and is absorbed by its elasticity. The spring 52 also serves as a shock absorbing member for protecting the movable core 53 and the bearing member 50 from an impact force.
[0054]
The movable core 53 is elastically held by an adjusting nut 56 by a set spring 57, and a sufficient play is provided between the inner surface of the through hole 54 of the movable core 53 and the connecting bolt 55. And the connecting bolt 55 can be relatively swung. Therefore, even when a load in the tilt direction is applied to the movable member 20 during the operation of the active vibration isolator M, the movable core can be swung by the swing of the connecting bolt 55. A favorable sliding relationship with the bearing member 50 can be maintained by preventing the inclination of the bearing 53. In this case, the set spring 57 moves in the lateral direction at least in accordance with the swing of the connecting bolt 55. Between the set spring 57 and the movable core 53, a spring seat 65 holding the lower end of the set spring 57 is provided. And a low friction material layer is formed on the contact surface between the spring seat 65 and the movable core 53, so that the spring seat 65 accompanying the set spring 57 slides smoothly on the upper surface of the movable core 53. As a result, the generation of wear powder from the movable core 53 can be effectively suppressed. Therefore, it is possible to prevent troubles caused by the wear powder, for example, the wear powder from entering the sliding portion of the bearing member 50 and the movable core 53 and hindering the movement of the movable core 53.
[0055]
The bearing member 50 is mounted at a fixed position on the lower yoke 36 by an extremely simple structure in which the set spring 52 is contracted between the outward flange 50b at the lower end thereof and the upper yoke 35. High precision is not required, and cost can be reduced. In addition, since the set spring 52 is arranged on the outer peripheral side of the bearing member 50, even if abrasion powder is generated between the set spring 52 and a portion where the set spring 52 is pressed, the bearing member of the abrasion powder is generated. The elastic powder 51 is provided between the outward flange 50b and the lower yoke 36 so that the wear powder can be prevented from entering the bearing member 50. The elastic member 51 can surely prevent the problem, and the bearing member 50 can exhibit good guideability to the movable core 53 for a long time.
[0056]
Further, the repulsive force of the set spring 52 is supported by the upper yoke 35 connected to the housing 32 and does not act on the movable core 53, so that the fixed spring due to the repulsive force of the set spring 52 and the effective suction force between the movable cores 33, 53 And the output performance of the movable core 53 can be improved.
[0057]
In the coil assembly 34, the coil 39 and the coil cover 41 that is in close contact with the outer peripheral surface of the bobbin 38 are molded so as to seal the coil 39 to the bobbin 38, so that the waterproofness of the coil 39 can be improved. Moreover, since the coil cover 41 is formed integrally with the coupler 42 that holds the coupler terminal 40 and protrudes outward in the radial direction, the lead wire connected to the coil 39 and the coupler holder that supports the coupler are not required, and the number of parts and the number of parts are reduced. The number of assembly steps is reduced, and the cost can be reduced.
[0058]
On one end surface of the bobbin 38, a small column 38a for insert-connecting the base end of the coupler terminal 40 is integrally formed. The small column 38a is connected to the coupler terminal 40 and has a lead wire 39a of the coil 39. Is wound, and thereafter, a projection 42a projecting from the lower end surface of the coil cover 41 and surrounding the small column 38a and the lead wire 39a is formed integrally with the coil cover 41 together with the coupler 42, so that the lead wire 39a of the coil 39 is By winding around the small support column 38a, the coil cover 41, the coupler 42, and the protrusion 42a can be formed while reliably preventing the lead wire 39a from being loosened.
[0059]
Further, when the coupler 42 is exposed to the outside through an opening 43 provided from the peripheral wall of the housing 32 to the bottom wall 32b, the protrusion 42a is disposed in the opening 43 so as to be adjacent to the bottom wall 32b. Therefore, there is no need to provide a housing space for the protrusion 42a in the housing 32, and the protrusion 42a does not protrude from the outer surface of the housing 32, so that the actuator 31 can be made more compact.
[0060]
The present invention is not limited to the above embodiment, and various design changes can be made without departing from the gist of the present invention. For example, in the above embodiment, the movable member 20 and the connecting bolt 55 are separately formed and screwed together to be integrated. However, both the members 20 and 55 may be integrally formed of the same material. Also, the fitting portion between the positioning shaft 33b of the fixed core 33 and the positioning hole 37 of the bottom wall 32b of the housing 32 can be fixed by welding instead of press-fitting.
[0061]
【The invention's effect】
As described above, according to the first aspect of the present invention, a fixed core supported on a bottom wall of a housing made of a magnetic material, and a movable core which is opposed to the fixed core via an air gap to drive a movable member And a coil assembly formed by winding a coil around a bobbin supported by the housing and surrounding the fixed and movable cores, wherein one end surface of the bobbin is provided with a base end of a coupler terminal. Are formed integrally with each other, the lead wire of the coil wound around the small support is connected to the coupler terminal, and the coil and the bobbin are sealed around the bobbin so as to seal the coil to the bobbin. A coupler that holds the coupler terminal and protrudes radially outward of the coil assembly in a coil cover to be molded; The protrusion that protrudes from the coil is integrally formed, so that the coil cover can enhance the waterproofness of the coil. In addition, the integration of the coil cover and the coupler eliminates the need for a lead wire connected to the coil and a coupler holder that supports the coupler. Thus, the number of parts and the number of assembling steps are reduced, and the cost can be reduced. In addition, by winding the lead wire of the coil around the small column, the coil cover, the coupler, and the protrusion can be formed while reliably preventing the lead wire from loosening.
[0062]
According to a second aspect of the present invention, in addition to the first aspect, the coupler is exposed to the outside through an opening provided from the peripheral wall to the bottom wall of the housing, and the projecting portion is connected to the bottom. Since the housing is disposed adjacent to the wall in the opening, there is no need to provide a housing space for the protrusion in the housing, and the protrusion does not protrude from the outer surface of the housing, so that the actuator can be made compact.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an active vibration isolating support device including the electromagnetic actuator of the present invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. 1. FIG. 3 is a sectional view taken along line 3-3 of FIG. 4 is an enlarged view of a main part of FIG. 1 [FIG. 5] A view of arrow 5 in FIG. 4 [FIG. 6] A view of arrow 6 of FIG. 4 [FIG. 7] A perspective view of an adjustment nut in FIG. Disassembled partial longitudinal side view of nut, connecting bolt and lock screw [Explanation of symbols]
g Air gap 20 Movable member 31 Electromagnetic actuator 32 Housing 32b Bottom wall 33 Fixed core 34 Coil assembly 38 bobbin 38a small column 39 coil 39a lead wire 40 coupler terminal 41 coil cover 42 coupler 42a projecting part 43 ··· Opening 53 ···· Movable core

Claims (2)

A fixed core (33) supported on a bottom wall (32b) of a housing (32) made of a magnetic material is opposed to the fixed core (33) via an air gap (g) to drive the movable member (20). A movable core (53), and a coil assembly (39) wound around a bobbin (38) supported by the housing (32) surrounding the fixed and movable cores (33, 53). 34), comprising:
On one end surface of the bobbin (38), a small support (38a) for insert-connecting the base end of the coupler terminal (40) is integrally formed, and the small support (38a) is wound around the small support (38a). A coil formed on the outer periphery of the coil (39) and the bobbin (38) such that a lead wire (39a) is connected to the coupler terminal (40) and the coil (39) is sealed in the bobbin (38). A cover (41) that holds the coupler terminal (40) and protrudes radially outward of the coil assembly (34), and the small support (38a) wraps the coil cover (38). 41. An electromagnetic actuator, wherein a projection (42a) projecting from the end face of (41) is integrally formed. The electromagnetic actuator according to claim 1,
The coupler (42) is exposed to the outside through an opening (43) provided from the peripheral wall of the housing (32) to the bottom wall (32b), and the projection (42a) is connected to the bottom wall (32b). An electromagnetic actuator, wherein the electromagnetic actuator is disposed in the opening (43) so as to be adjacent to each other.

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