JP5331623B2 - Radiator ventilation structure - Google Patents

Description

  The present invention relates to an improvement in a radiator ventilation structure.

  As a conventional radiator ventilation structure, a radiator grill that can be freely opened and closed is opened and closed by a motor via a gear train and a staggered shaft gear (see, for example, Patent Document 1).

  According to FIG. 1 and FIG. 2 of Patent Document 1, a gear train 8 is connected to a rotating shaft of a motor 9, and a staggered shaft gear 4 is connected to a drive shaft 6 attached to one gear of the gear train 8. The connecting rod 3 is connected to the connecting rod 3, and a plurality of wing-shaped radiator grilles 1 are attached to the connecting rod 3.

When the rotation shaft of the motor 9 rotates, this rotation is transmitted to the drive shaft 6 via the gear train 8, and the gear attached to the drive shaft 6 among the two gears 5 and 7 constituting the staggered shaft gear 4. The rotation is transmitted from 7 to the gear 5 meshing with the gear 7, and the radiator grille 1 is rotated together with the connecting rod 3 attached to the gear 5 to open and close the radiator grille 1.
The staggered shaft gear 4 is a worm gear pair composed of a worm and a worm gear.

Japanese Utility Model Publication No. 58-025228

  For example, when a vehicle enters a puddle during traveling or water splashed by an oncoming vehicle collides with the radiator grill 1, the water transmission overloads the power transmission path from the radiator grill 1 to the motor 9. May cause damage to parts of the power transmission path.

In addition, it is desirable that the radiator grill 1 can be restored even if it does not break when the state of the radiator grill 1 is changed (closed → opened or opened → closed) by the water hammer.
Furthermore, when returning, it is not necessary to detect the rotation angle of the radiator grille 1 with a sensor or the like, so that the structure of the opening / closing device of the radiator grille 1 can be simplified, space saving, and cost reduction can be achieved by reducing the number of parts. It is also desirable to reduce power consumption when holding or returning the radiator grille 1 in the open and closed positions.

  An object of the present invention is to provide a radiator ventilation structure that can absorb external force such as water hammer and can return the open / close state of the opening / closing means, and can further simplify the structure, save space, reduce costs, and save energy. It is in.

According to the first aspect of the present invention, an opening / closing means is provided in an outside air introduction portion that allows the traveling wind to be introduced from the opening at the front end portion of the vehicle body to the vehicle body front portion. In the radiator ventilating structure for controlling the amount of traveling air sent to the provided radiator, the opening / closing means is pivotable with its rotating shaft connected to the rotating shaft side of the driving means, and the traveling wind is sent to the radiator. An open state, a closed state in which traveling wind is blocked from being sent to the radiator, and an intermediate opening state between the open state and the closed state are selectably switched. The rotor is arranged on the inner side in the radial direction of the stator and is supported by a rotating shaft that extends in the same direction as the rotating shaft. The stator includes a stator core having a plurality of teeth protruding toward the rotor, and a plurality of teeth. Part Without even consists of a coil for rotating the rotor by magnetic flux generated during energization while being attached to one rotor, a rotor core mounted on the rotary shaft, mounted in a position opposing the outer peripheral surface of the rotor core It consists of at least two magnets with different magnetic poles, and a non-magnetic pole part without magnetic poles is formed between the magnets with different magnetic poles on the outer peripheral surface of the rotor core, and the rotation direction of the rotor controls the energization of the coil The positioning and holding of the opening / closing means at a predetermined position is performed by at least the attraction force between the magnet and the tooth portion magnetized by the magnet, and the tooth portion is the main tooth on which the coil is mounted. And the other two sub-tooth portions of the main tooth portion, and the main tooth portion and the sub-tooth portion are divided into three equal parts in the circumferential direction around the rotation axis of the rotor. In the rotating position of the rotor in which the attraction force that one of the magnets and one of the sub-tooth portions attracts each other and the attraction force that the other of the magnets attracts the other of the sub-tooth portions balances, the opening / closing means There characterized that you have been configured to be retained while being positioned in the intermediate opening conditions.

For example, when an impact such as a water hammer by water splashed up from an oncoming vehicle is input to the opening / closing means, the turning shaft of the opening / closing means is rotated by the impact to rotate the rotating shaft of the driving means. As a result, the rotor rotates against the attractive force between the magnets attached to the rotor supported by the rotating shaft of the driving means and the teeth of the stator.
When the impact is no longer applied to the opening / closing means, the rotor is rotated to the original position by the attractive force of the magnet and the tooth portion, and the opening / closing means is returned to the original position.

  When the coil is energized, the same magnetic pole is generated in the two sub-tooth portions, so one of the magnets having different magnetic poles attached to the rotor and one of the sub-tooth portions attract each other, and the other magnet and the sub-tooth portion The other side of the rotor repels and the rotor rotates to a predetermined position. As a result, one of the magnets moves to a position close to one of the sub-tooth portions.

  Even when energization is stopped in this state, a magnetic pole different from one of the magnets is generated on one of the sub-tooth portions, and one of the magnets and one of the sub-tooth portions attract each other, so that the opening / closing means is positioned. Retained.

  In addition, at the rotational position of the rotor where one magnet attracts one sub-tooth part and the other magnet attracts the other sub-tooth part, the respective attraction forces are balanced so that the opening / closing means is fully closed. Is positioned and held at an intermediate opening between the position and the fully open position.

When the rotor rotates from the intermediate rotation position of the rotor where the attractive force between one of the magnets and one of the sub-tooth parts and the attractive force between the other of the magnets and the other of the auxiliary tooth parts are balanced, Since the cogging torque is likely to change greatly due to the difference in magnetic force, the opening / closing means can be easily held at an intermediate opening between fully closed and fully opened.
In the invention according to claim 2, the positions of the two magnets are symmetrical with respect to the center line passing through the rotation shaft and the main tooth portion when the stator and the rotor are viewed from the axial direction of the rotation shaft of the rotor. The two magnets are provided in a range of 60 ° to 100 ° around the rotation axis on the outer peripheral surface of the rotor core.

The invention according to claim 3 is characterized in that the rotating shaft is connected to the rotating shaft through a link mechanism.
When the driving means is operated, the rotation of the rotation shaft of the driving means is transmitted to the rotation shaft of the opening / closing means via the link mechanism, and the opening / closing means is opened / closed.

  In the invention according to claim 1, the opening / closing means is connected to the rotating shaft side of the driving means so that the opening / closing means can be turned, and the running wind is sent to the radiator, and the running wind is sent to the radiator. The closed state is blocked so as not to be selected, and the drive means is selected from a rotor supported by a rotating shaft extending in the same direction as the rotating shaft, and a stator disposed radially outside the rotor. The rotor core is composed of a rotor core attached to the rotating shaft and at least two magnets having different magnetic poles attached to the outer peripheral surface of the rotor core, and the stator has a plurality of tooth portions protruding toward the rotor. And a coil that is attached to at least one of the plurality of tooth portions and rotates the rotor by the magnetic flux generated during energization. Switched by a control unit that controls electricity, positioning and holding of the opening and closing means at a predetermined position is performed at least by the attractive force between the magnet and the tooth portion magnetized by this magnet, so that impact such as water hammer is opened and closed When input to the means, the opening / closing means can be rotated by the impact, and the impact can be absorbed. Therefore, it is possible to prevent an overload from acting on components from the opening / closing means to the driving means.

  Furthermore, the opening / closing means can be rotated and returned to the original position by the attractive force between the magnet and the tooth portion, and there is no need for a sensor or the like for detecting the rotation angle for the return. Since the shaft and the rotating shaft of the driving means extend in the same direction, a conventional worm gear pair or the like is not required, and the structure can be simplified, space-saving, and cost can be reduced. Furthermore, power consumption can be suppressed by holding and returning the opening / closing means by magnetic force.

Moreover, in the invention which concerns on Claim 1 , a tooth part consists of the main tooth part to which a coil is mounted | worn, and two other sub tooth parts of this main tooth part, and is in the position which the outer peripheral surface of a rotor core mutually opposes. Since magnets having different magnetic poles are arranged, the closed state and open state of the opening / closing means can be maintained by the attractive force between the magnet and the sub-tooth part even when energization to the coil is stopped. Can be suppressed, and energy saving can be achieved.

  Further, at the intermediate rotation position of the rotor corresponding to the intermediate opening position of the opening / closing means, an attractive force is generated between the magnet having one magnetic pole and the one sub-tooth portion, and at the same time the magnet having the other magnetic pole and the other By generating a suction force with the secondary tooth portion, the opening / closing means can be positioned and held at an intermediate position between the fully open state and the fully closed state. Therefore, the opening / closing means can be controlled more finely by setting the opening / closing means to an intermediate opening.

Further, in the invention according to claim 1 , since the non-magnetic pole portion having no magnetic pole is formed between the magnets having different magnetic poles on the outer peripheral surface of the rotor core, by providing the non-magnetic pole portion, the opening / closing means is fully closed and fully opened. Can be easily maintained at an intermediate opening between the two.
In the invention according to claim 2, for example, when an impact such as a water hammer by water splashed up from an oncoming vehicle is input to the opening / closing means, the rotation shaft of the opening / closing means is rotated by the impact, and the drive means Rotate the rotating shaft. When the impact is no longer applied to the opening / closing means, the rotor is rotated to the original position by the attractive force of the magnet and the tooth portion, and the opening / closing means is returned to the original position.

In the invention according to claim 3 , since the rotating shaft is connected to the rotating shaft via the link mechanism, there is no need to provide a gear between the opening / closing means and the driving means, so that the cost reduction, size reduction, and gearing are achieved. Reduction of mechanical loss by abolition, that is, energy saving can be achieved.

It is a perspective view of the front part of the body which shows the radiator ventilation structure concerning the present invention. 1 is a first cross-sectional view of a front portion of a vehicle body showing a radiator ventilation structure according to the present invention. FIG. 6 is a second cross-sectional view of the front portion of the vehicle body showing the radiator ventilation structure according to the present invention. It is explanatory drawing which shows the torque motor (Example 1) of the radiator ventilation structure which concerns on this invention. It is the 1st operation figure (example 1) which shows the operation of the radiator ventilation structure concerning the present invention. It is the 2nd operation figure (example 1) which shows the operation of the radiator ventilation structure concerning the present invention. It is the 3rd operation figure (example 1) which shows the operation of the radiator ventilation structure concerning the present invention. It is a graph (Example 1) which shows the relationship between the rotational torque in the torque motor of the radiator ventilation structure which concerns on this invention, and a rotor rotational angle. It is explanatory drawing which shows the torque motor (Example 2) of the radiator ventilation structure which concerns on this invention. It is a graph (Example 2) which shows the relationship between the rotational torque in the torque motor of the radiator ventilation structure which concerns on this invention, and a rotor rotational angle.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, left, right, front, and rear indicate directions based on the driver who has boarded the vehicle. The drawings are to be viewed in the direction of the reference numerals.

A first embodiment of the present invention will be described. The arrow (FRONT) in the figure indicates the front of the vehicle.
As shown in FIG. 1, a radiator ventilator 11 that controls the amount of traveling air sent to the radiator is attached to the front surface of the bulkhead 10 that constitutes the front body of the vehicle.
The radiator ventilation device 11 includes a shutter mechanism 13 attached to the front surface of the bulkhead 10.

  The shutter mechanism 13 includes a shutter base 14 attached to the bulkhead 10, a plurality of longitudinal support members 16 provided on the shutter base 14, and a plurality of shutters 17 supported by the longitudinal support members 16 so as to be opened and closed. With. Reference numerals 14 a and 14 b are ventilation openings provided at the upper and lower portions of the shutter base 14.

As shown in FIG. 2, the radiator ventilator 11 includes a radiator 22, a duct 22 having a front end connected to an opening 21 a of a grill 21 provided at a front end of a vehicle body and a rear end connected to a shutter mechanism 13. 23, a shutter mechanism 13 disposed in front of the shutter 23, a torque motor 26 connected to each shutter 17 of the shutter mechanism 13 via a link mechanism 24, a control unit 27 that controls the torque motor 26, and a link mechanism 24. The stopper portion 28 restricts the movement of the movable portion. Reference numeral 31 denotes an air conditioner capacitor disposed behind the shutter mechanism 13 and in front of the radiator 23.
In FIG. 2, each shutter 17 of the shutter mechanism 13 is in a closed state (fully closed), and traveling wind is not guided to the radiator 23.

The shutter mechanism 13 includes a plurality of rotating shafts 35 supported by the vertically long member 16 of the shutter base 14, and the shutters 17 are rotatably attached to these rotating shafts 35.
The link mechanism 24 includes a vertically extending slide link 37 connected to a plurality of shutters 17, one end connected to the lower end of the slide link 37 via a connecting pin 38, and the other end connected to the torque motor 26. And an arm link 39 attached thereto.

The shutter 17 and the slide link 37 are swingably connected via a joint 41.
The torque motor 26 is a DC motor that rotates within the range of the rotation angle of the rotation shaft 63 and uses the torque generated on the rotation shaft 63. The torque motor 26 includes a motor case 43. The control unit 27 is accommodated.

The stopper portion 28 includes a lower stopper 46 that restricts the downward movement of the slide link 37 that slides up and down, and an upper stopper 47 that restricts the upward movement of the slide link 37.
In the state shown in the figure, the lower end of the slide link 37 is in contact with the lower stopper 46.

FIG. 3 shows a state in which each shutter 17 of the shutter mechanism 13 is opened (fully opened). While the vehicle is traveling in this state, the traveling wind introduced from the opening 21a of the grill 21 passes through the duct 22, passes between the shutters 17, passes through the air conditioner condenser 31 and the radiator 23, and passes through the air conditioner. Heat is taken from the condenser 31 for the conditioner and the radiator 23.
In the state shown in the figure, the upper end of the slide link 37 is in contact with the upper stopper 47.

  4A and 4B show a state in which the case cover is removed from the motor case 43 of the torque motor 26 (consisting of a case body 51 and a case cover (not shown) that closes the opening of the case body 51). Show.

  In FIG. 4 (a), a motor main body 44 is arranged on the bottom side of the case main body 51, and a control unit comprising a control board on which electronic components are mounted on a printed circuit board so as to cover a part of the motor main body 44. 27 and the motor body 44 and the controller 27 are fastened to the case body 51 with a plurality of screws 53.

  4B, the motor main body 44 includes a stator 61 attached to the case main body 51, a rotor 62 disposed inside the stator 61, and the motor case 43 (FIG. 2) while supporting the rotor 62. And a rotating shaft 63 supported rotatably.

  4C is a front view of the motor main body 44, and the stator 61 includes a stator core 65 formed by laminating a plurality of silicon steel plates, and a coil 66 attached to the stator core 65. FIG.

  The stator core 65 includes a frame-shaped portion 65g that forms a rectangular outer peripheral portion, a main tooth portion 65a that protrudes from one longitudinal end portion of the frame-shaped portion 65g toward the rotor 62, and the longitudinal direction of the frame-shaped portion 65g. Two sub-tooth portions 65 b and 65 c projecting from the corners of the end portions toward the rotor 62 are provided, and these main tooth portions 65 a and sub-tooth portions 65 b and 65 c are provided so as to be close to the rotor 62.

  Here, reference numeral 65d is a protrusion protruding outward from the frame-shaped portion 65g so as not to affect the magnetic flux generated in the frame-shaped portion 65g, and 65e is a case main body 51 (see FIG. 5A). This is a screw insertion hole formed in the protrusion 65d so as to pass a screw attached with a screw.

  When the angles formed by the center line 71 passing through the center of the main tooth portion 65a and the center lines 72 and 73 of the sub tooth portions 65b and 65c are θ1, respectively, for example, θ1 is 40 ° to 60 °, and θ1 = 60. In the case of °, the main tooth portion 65 a and the sub tooth portions 65 b and 65 c are arranged at positions equally divided into three in the circumferential direction around the rotation shaft 63 of the rotor 62.

  As described above, the main tooth portion 65a and the sub tooth portions 65b and 65c are arranged at a position equally divided into three in the circumferential direction around the rotation shaft 63 of the rotor 62, or at positions almost equally divided into three in the circumferential direction. Be placed.

The rotor 62 includes a rotor core 76 formed by laminating a plurality of silicon steel plates, and arc-shaped permanent magnets 77 and 78 fitted in recesses 76b and 76b formed on the outer peripheral surface 76a of the rotor core 76. The rotor core 76 is attached to the rotating shaft 63.
Since the rotor convex portions 76d and 76e provided between the concave portions 76b and 76b of the rotor 62 are located between the two magnets 77 and 78, they are non-magnetic pole portions having no magnetic poles.

  In the state shown in the figure, the magnets 77 and 78 are arranged at positions symmetrical with respect to the center line 71 of the main tooth portion 65a. When the opening angle of the arcs of the magnets 77 and 78 is θ2, for example, θ2 is 60 ° to 100 °.

One of the magnets 77 has an N pole on the outer surface of the arc and an S pole on the inner surface of the arc. In the drawing, the magnetic pole “N” on the outer surface side is shown.
The other magnet 78 has an S pole on the outer surface of the arc and an N pole on the inner surface of the arc. In the drawing, the magnetic pole “S” on the outer surface side is shown.

  FIG. 4D is a front view of the control unit 27, and the control unit 27 includes a printed circuit board 81 and electronic components (FET 82, diode 83, capacitor 84, etc.) attached to the printed circuit board 81. Reference numeral 87 denotes a screw insertion hole opened in the printed circuit board 81 for passing a screw for attaching the control unit 27 together with the stator core 65, and 88 denotes a rotor 62 (see FIG. 4C) for avoiding interference. It is a notch formed in the printed circuit board 81 along the outer peripheral surface of the rotor 62.

  4 (a) and 4 (c), the stator core 65 of the stator 61 is made of metal, and the controller 27 is attached to the stator core 65, so that heat generated by the controller 27 can be released from the stator core 65. The operation of the control unit 27 can be stabilized. Further, it is not necessary to provide a special cooling means for the control unit 27, and the cost can be reduced.

The operation of the shutter mechanism 13 and the torque motor 26 described above will be described next.
FIG. 5A shows a state where the shutter 17 of the shutter mechanism 13 is closed (fully closed). The coil 66 of the stator 61 is not energized.
At this time, due to the magnetic field around the magnet 77, an S pole is generated at the tip of the auxiliary tooth portion 65b of the stator core 65 and an N pole is generated at the tip of the main tooth portion 65a.

  As a result, a magnetic flux (a bundle of magnetic lines of force, indicated by a thin line in the figure, the same applies hereinafter) flowing from the sub-tooth portion 65b of the stator core 65 to the main tooth portion 65a via the frame-like portion 65g is generated. Since the magnet 77 and the sub-tooth portion 65b are attracted to each other, the rotor 62 is positioned and held at a position where the shutter 17 is closed by this magnetic force without energizing the coil 66.

In FIG. 5B, when the coil 66 of the stator 61 is energized, the stator core 65 becomes an electromagnet, and a magnetic flux indicated by a thick line is generated in the stator core 65.
As a result, the N pole (shown in bold) is at the tip of the subtooth portion 65b, the S pole (shown in bold) is at the tip of the main tooth 65a, and the tip of the subtooth 65c. N pole (shown in bold) is generated.

  Since the strength of the magnetic pole generated by the electromagnet exceeds the strength of the magnet 77, the N pole of the auxiliary tooth 65b and the N pole of the magnet 77 repel each other, and the S pole of the main tooth 65a and the S of the magnet 78 The poles repel each other, and the N pole of the sub-tooth portion 65c and the S pole of the magnet 78 attract each other, so that the rotor 62 rotates in the direction indicated by the white arrow.

Thereby, as shown in FIG.5 (c), the shutter 17 opens.
Further, the magnet 78 of the rotor 62 is close to the sub-tooth portion 65c, and an N pole (with parentheses) is generated at the tip of the sub-tooth portion 65c of the stator core 65 by the magnetic field around the magnet 78, and the main tooth portion 65a An S pole (with parentheses) is generated at the tip.

FIG. 6A shows a state where the shutter 17 of the shutter mechanism 13 is opened. The coil 66 of the stator 61 is not energized.
As in the case of FIG. 5C, an N pole is generated at the tip of the auxiliary tooth portion 65c of the stator core 65, and an S pole is generated at the tip of the main tooth portion 65a.

  As a result, a magnetic flux (indicated by a thin line) flowing from the main tooth portion 65a to the sub tooth portion 65c of the stator core 65 through the frame-like portion 65g is generated, and the magnet 78 and the sub tooth portion 65c are attracted. Therefore, even if the coil 66 is not energized, the rotor 62 is positioned and held at the position where the shutter 17 is opened.

  In FIG. 6B, when the coil 66 of the stator 61 is energized in the direction opposite to that in FIGS. 5B and 5C, the stator core 65 becomes an electromagnet, and a magnetic flux indicated by a thick line is generated in the stator core 65.

As a result, an S pole (bold) is generated at the distal end of the auxiliary tooth 65c, an N pole (bold) is generated at the distal end of the main tooth 65a, and an S pole (bold) is generated at the distal end of the auxiliary tooth 65b. .
Since the strength of the magnetic pole generated by the electromagnet exceeds the strength of the magnet 78, the S pole of the sub-tooth portion 65c and the S pole of the magnet 78 repel each other, and the N pole of the main tooth portion 65a and the N pole of the magnet 77 The poles repel each other, and the south pole of the auxiliary tooth portion 65b and the north pole of the magnet 77 attract each other, so that the rotor 62 rotates in the direction indicated by the white arrow.

As a result, the shutter 17 is closed as shown in FIG.
Further, since the magnet 77 of the rotor 62 is close to the sub-tooth portion 65b, an S pole (with parentheses) is generated at the tip of the sub-tooth portion 65b of the stator core 65 by the magnetic field around the magnet 77 and the main tooth portion 65a. N poles (with parentheses) are generated at the tip of each.
Therefore, even when the energization of the coil 66 is stopped, the rotor 62 is positioned and held at a position where the shutter 17 is closed as in the case of FIG.

  As shown in FIG. 7, the shutter 17 is not fully energized by the rotor 62 of the motor main body 44, and the shutter 17 is in the fully closed position (position indicated by a two-dot chain line) and the fully open position (indicated by a broken line). It is also possible to position and hold at an intermediate position (position indicated by a solid line) between the two positions.

  That is, when the end portion of the magnet 77 is close to the sub tooth portion 65b and the end portion of the magnet 78 is close to the sub tooth portion 65c, an S pole is generated at the tip of the sub tooth portion 65b, and the sub tooth portion 65c. N pole is generated at the tip of the magnet, and the magnet 77 and the sub-tooth portion 65b, and the magnet 78 and the sub-tooth portion 65c are attracted to each other. It can be positioned and held at the intermediate opening position.

  In FIG. 8A, the vertical axis of the graph is the rotational torque for rotating the rotor of the torque motor, the positive side with respect to zero is the torque in the shutter opening direction, and the negative side is the torque in the shutter closing direction. It is. The horizontal axis is the rotation angle of the rotor, zero is the intermediate opening, the positive side is the opening direction, α is the rotation angle when the shutter is fully open, the negative side is the closing direction, and -α is the rotation angle when the shutter is fully closed It is.

  Further, the solid line represents the rotational torque required to rotate the rotor from the outside when the torque motor is not energized, and the broken line represents the rotor driving torque (rotation torque) when the torque motor is energized.

  When the torque motor is not energized, when the rotor rotates in the opening direction from -α where the rotor rotation angle is fully closed, the rotation torque gradually increases from -Ta on the negative side (the absolute value of the rotation torque). The value becomes smaller and close to zero), and the rotation torque becomes zero at the rotor rotation angle -β. When the rotor further rotates, the direction of the rotation torque changes from the shutter closing direction to the shutter opening direction. At the same time, the maximum value Tb in the shutter opening direction is reached at the rotor rotation angle −γ, and the rotation torque decreases again (close to zero) at the maximum value Tb, and the rotor opening angle is zero (intermediate opening of the shutter). The rotation torque becomes zero.

  Further, when the rotor rotation angle increases, the direction of the rotation torque changes to the direction of the shutter closing direction, and at the rotor rotation angle γ, the rotation torque becomes a minimum value −Tb in the shutter closing direction, and this minimum value. The rotational torque increases again at −Tb (the absolute value of the rotational torque decreases and approaches zero), and the rotational torque becomes zero at the rotor rotational angle β. When the rotor is further rotated, the direction of the rotation torque is changed to be in the shutter opening direction, the rotor rotation angle is α, the rotation torque is Ta, and the shutter is fully opened.

  Since the direction of the rotational torque is in the shutter opening direction near the rotor rotational angle −γ and the shutter is closed in the vicinity of the rotor rotational angle γ, rotational torque is generated to hold the shutter at the intermediate opening position. If the rotational torque of the rotor (ie, Tb) is set higher than the torque input to the shutter that is assumed due to an impact such as water hammer, the rotor will return to its original position (intermediate opening position) even if the impact is input. ) And the shutter open / closed state can be maintained.

  Further, since Ta> Tb, even when the shutter is fully closed or fully opened, the rotational torque Ta is larger than the torque due to the impact such as water hammer. Alternatively, it can be returned to the fully open position.

  When the shutter is opened from the fully closed state, the drive torque (rotation torque) of the torque motor when the torque motor is energized is opposite to the rotation torque -Ta at the time of non-energization at the rotor rotation angle -α. In the shutter opening direction, the absolute value becomes Tc, which increases as the rotor rotation angle increases. However, as the rotor rotation angle increases, the rate of increase in rotation torque gradually decreases, and the rotor rotation angle becomes smaller. Immediately after passing zero, it becomes maximum, and then gradually decreases until the rotor rotation angle becomes α.

  In particular, when the rotor rotation angle is -α to -β, it is necessary to rotate the rotor against the cogging torque in the closing direction generated by the attractive force between the magnet and the sub-tooth portion. This is because when the moving angle is β to α, the cogging torque in the opening direction generated by the attractive force between the magnet and the sub-tooth portion is generated, so that the driving torque of the torque motor can be reduced.

  When the shutter is closed from the fully open state, the driving torque (rotation torque) of the torque motor when the torque motor is energized is opposite to the rotation torque Ta when the energization is not performed at the rotor rotation angle α (shutter closing). Direction), the absolute value becomes -Tc, and gradually decreases as the rotor rotation angle decreases. However, as the rotor rotation angle decreases, the decrease rate of the rotation torque gradually decreases (the absolute value of the rotation torque). Immediately after the rotor rotation angle exceeds zero, it becomes minimum (absolute value is maximum), and thereafter gradually increases until the rotor rotation angle becomes -α.

FIGS. 8B to 8F show the rotor rotation position corresponding to the predetermined rotor rotation angle of FIG. 8A.
FIG. 8B shows the rotation position of the rotor 62 when the rotor rotation angle is −α. That is, the magnet 77 is close to the center portion in the circumferential direction so as to face the center portion of the width of the sub-tooth portion 65b.

  FIG. 8C shows the rotation position of the rotor 62 when the rotor rotation angle is −β. That is, the magnet 77 is opposed to the sub-tooth portion 65b, and the magnet 78 is located between the sub-tooth portion 65c and the main tooth portion 65a.

  FIG. 8D shows the rotation position of the rotor 62 when the rotor rotation angle is zero. That is, the attractive force between the magnet 77 and the sub-tooth portion 65b is balanced with the attractive force between the magnet 78 and the sub-tooth portion 65c.

  FIG. 8E shows the rotational position of the rotor 62 when the rotor rotational angle is β. That is, the magnet 78 is opposed to the sub-tooth portion 65c, and the magnet 77 is positioned between the sub-tooth portion 65b and the main tooth portion 65a.

  FIG. 8F shows the rotation position of the rotor 62 when the rotor rotation angle is α. That is, the magnets 78 are close to each other so that the central portion in the circumferential direction of the magnet 78 faces the central portion of the width of the auxiliary tooth portion 65c.

Next, a second embodiment of the present invention will be described.
As shown in FIG. 9, the torque motor 90 is a DC motor that rotates within the range of the rotation angle of the rotation shaft 63 and uses the torque generated on the rotation shaft 63. 2), a stator 61 attached to the motor case 43, a rotor 91 disposed inside the stator 61, and a rotating shaft that supports the rotor 91 and is rotatably supported by the motor case 43. 63.

The rotor 91 includes a rotor core 93 formed by laminating a plurality of silicon steel plates, and arc-shaped permanent magnets 95 and 96 attached to the outer peripheral surface 93a of the rotor core 93. The rotor core 93 is attached to the rotating shaft 63. Installed.
In the state shown in the figure, the magnets 95 and 96 are arranged at positions symmetrical with respect to the center line 71 of the main tooth portion 65a. The opening angle of the arcs of the magnets 95 and 96 is 180 °.

One magnet 95 has an N pole on the outer surface of the arc and an S pole on the inner surface of the arc. In the drawing, the magnetic pole “N” on the outer surface side is shown.
The other magnet 96 is magnetized with an S pole on the outer surface of the arc and an N pole on the inner surface of the arc. In the drawing, the magnetic pole “S” on the outer surface side is shown.

  At the positions of the magnets 95 and 96 in the figure, an S pole is generated at the tip of the auxiliary tooth portion 65b of the stator 61 and an N pole is generated at the tip of the auxiliary tooth portion 65c. The S pole attracts each other, the S pole of the magnet 96 and the N pole of the auxiliary tooth portion 65 c attract each other, and the rotational torque of the rotational shaft 63 becomes zero, and the shutter connected to the rotational shaft 63. Are positioned and held at an intermediate opening.

In FIG. 10, the vertical axis of the graph is the rotational torque for rotating the rotor of the torque motor, the positive side with respect to zero is the torque in the shutter opening direction, and the negative side is the torque in the shutter closing direction. The horizontal axis is the rotation angle of the rotor, zero is the intermediate opening, the positive side is the opening direction, α is the rotation angle when the shutter is fully open, the negative side is the closing direction, and -α is the rotation angle when the shutter is fully closed It is.
Further, the solid line represents the rotational torque required to rotate the rotor from the outside when the torque motor is not energized, and the broken line represents the rotor driving torque (rotation torque) when the torque motor is energized.

  When the torque motor is not energized, when the rotor rotates in the opening direction from -α where the rotor rotation angle is fully closed, the rotation torque gradually increases linearly from -Ta on the negative side (rotation) The absolute value of the torque gradually decreases linearly and approaches zero), and the rotation torque becomes zero at a rotor rotation angle of zero (the intermediate opening of the shutter).

Further, when the rotor rotation angle is increased, the direction of the rotation torque is changed from the direction of the shutter closing direction to the direction of the shutter opening direction, and further increases linearly, the rotor rotation angle is α, and the rotation torque is Ta. And the shutter is fully open.
As described above, the torque motor 90 (see FIG. 9) can hold the rotor and the rotation shaft at the fully closed position, the intermediate opening degree, and the fully opened position when the power is not supplied.

  When the shutter is opened from the fully closed state, the torque motor drive torque (rotation torque) when the torque motor is energized is the rotation torque at non-energization at the rotor rotation angle -α (shutter fully closed). In the direction opposite to Ta (shutter opening direction), the absolute value becomes Tc and increases as the rotor rotation angle increases. However, as the rotor rotation angle increases, the increase rate of the rotation torque gradually decreases. Immediately after the rotor rotation angle exceeds zero, it becomes maximum, and thereafter gradually decreases until the rotor rotation angle becomes α (shutter fully open).

  This is because when the rotor rotation angle is -α to zero, it is necessary to rotate the rotor against the cogging torque in the closing direction generated by the attraction force between the magnet and the sub-tooth portion. This is because, in the range of zero to α, the cogging torque in the opening direction generated by the attraction force between the magnet and the sub-tooth portion is generated, so that the driving torque of the torque motor can be reduced.

  When the shutter is closed from the fully open state, the driving torque (rotation torque) of the torque motor when the torque motor is energized is opposite to the rotation torque Ta when the energization is not performed at the rotor rotation angle α (shutter closing). Direction), the absolute value becomes -Tc, and gradually decreases as the rotor rotation angle decreases. However, as the rotor rotation angle decreases, the decrease rate of the rotation torque gradually decreases (the absolute value of the rotation torque). Immediately after the rotor rotation angle exceeds zero, it becomes minimum (absolute value is maximum), and thereafter gradually increases until the rotor rotation angle becomes -α.

  As shown in FIG. 2 and FIG. 4 described above, the grill 21 serving as the outside air introduction portion that allows the traveling wind to be introduced into the front portion of the vehicle body from the opening portion of the front end portion of the vehicle body, that is, the opening portion 21 a of the grill 21, and the duct 22. Is provided with a shutter mechanism 13 as an opening / closing means, and a radiator ventilation structure for controlling the amount of traveling air sent to a radiator 23 provided at the front of the vehicle body by opening / closing the shutter mechanism 13 with a torque motor 26 as a driving means. In the shutter mechanism 13, the rotation shaft 35 is connected to the rotation shaft 63 side of the torque motor 26 so as to be rotatable, and the traveling wind is sent to the radiator 23, and the traveling wind is sent to the radiator 23. When the torque motor 26 is arranged on the inner side in the radial direction of the stator 61, the closed state in which the motor is shut off is switched to be selectable. The rotor 61 is supported by a rotating shaft 63 that extends in the same direction as the rotating shaft 35, and the stator 61 includes a main tooth portion 65 a and a sub tooth portion 65 b as a plurality of tooth portions protruding toward the rotor 62. A stator core 65 having 65c, and a coil 66 that is attached to at least one of the plurality of main tooth portions 65a and auxiliary tooth portions 65b and 65c and rotates the rotor 62 by magnetic flux generated during energization. The rotor core 76 is attached to the rotary shaft 63, and the permanent magnets 77 and 78 as at least two magnets having different magnetic poles attached to the outer peripheral surface 76a of the rotor core 76. Is switched by the control unit 27 that controls the energization of the shutter mechanism 13, and the shutter mechanism 13 is positioned and held at a predetermined position at least A permanent magnet 77 and 78, characterized in that it is carried out by the suction force of the auxiliary teeth portion 65b, 65c which are magnetized by these permanent magnets 77 and 78.

  With the above configuration, when an impact such as water hammer is input to the shutter mechanism 13, the shutter mechanism 13 can be rotated by the impact and the impact can be absorbed. Therefore, it is possible to prevent an overload from acting on the components from the shutter mechanism 13 to the torque motor 26.

  Furthermore, the shutter mechanism 13 can be rotated and returned to the original position by the attractive force of the permanent magnets 77 and 78 and the auxiliary teeth 65b and 65c, and a sensor or the like for detecting the rotation angle for the return is necessary. In addition, since the rotation shaft 35 of the shutter mechanism 13 and the rotation shaft 63 of the torque motor 26 extend in the same direction, there is no need for a conventional worm gear pair or the like, which simplifies the structure, saves space, and costs. Reduction can be achieved. Furthermore, power consumption can be suppressed by holding and returning the shutter mechanism 13 by magnetic force.

  As shown in FIG. 4C, the tooth portion is composed of a main tooth portion 65a to which the coil 66 is attached and the other two sub tooth portions 65b and 65c of the main tooth portion 65a. Permanent magnets 77 and 78 having different magnetic poles are arranged at positions facing each other on the outer peripheral surface 76 a of 76.

  With the above configuration, even when energization of the coil 66 is stopped, the closed state and the open state of the shutter mechanism 13 can be maintained by the attractive force between the permanent magnets 77 and 78 and the auxiliary tooth portions 65b and 65c. Consumption can be suppressed and energy saving can be achieved.

  In addition, at the intermediate rotational position of the rotor 62 corresponding to the intermediate opening position of the shutter mechanism 13, an attractive force is generated between the permanent magnet 77 having the N pole as one magnetic pole and the one auxiliary tooth portion 65 b, At the same time, the shutter mechanism 13 is positioned and held at an intermediate position between the fully open state and the fully closed state by generating an attractive force between the permanent magnet 78 having the S pole as the other magnetic pole and the other auxiliary tooth portion 65c. Can do. Therefore, the opening / closing control of the shutter mechanism 13 can be performed more finely by setting the shutter mechanism 13 to the intermediate opening.

  As shown in FIGS. 4C and 8A, non-magnetic pole portions 76d and 76e having no magnetic poles are formed between the permanent magnets 77 and 78 having different magnetic poles on the outer peripheral surface 76a of the rotor core 76. Therefore, by providing the non-magnetic pole portions 76d and 76e, the shutter mechanism 13 can be easily held at an intermediate opening between the fully closed state and the fully opened state.

  As shown in FIG. 2 above, since the rotation shaft 35 is connected to the rotation shaft 63 via the link mechanism 24, there is no need to provide a gear between the shutter mechanism 13 and the torque motor 26. Cost reduction, downsizing, and reduction of mechanical loss by eliminating gears, that is, energy saving can be achieved.

  In the first and second embodiments, the permanent magnets 77, 78, 95, and 96 are used for the rotors 62 and 91. However, the present invention is not limited to this, and an electromagnet may be used for the rotor instead of the permanent magnet.

  The radiator ventilation structure of the present invention is suitable for an automobile.

  DESCRIPTION OF SYMBOLS 11 ... Radiator ventilation device, 13 ... Opening / closing means (shutter mechanism), 21, 22 ... Outside air introduction part (grill, duct), 21a ... Opening part, 23 ... Radiator, 24 ... Link mechanism, 26, 90 ... Driving means (torque) Motor), 27 ... control unit, 35 ... rotating shaft, 61 ... stator, 62, 91 ... rotor, 63 ... rotating shaft, 65 ... stator core, 65a ... tooth portion (main tooth portion), 65b, 65c ... tooth portion ( (Sub-tooth portion), 66 ... coil, 76, 93 ... rotor core, 76d, 76e ... non-magnetic pole part (rotor convex part), 77, 78, 95, 96 ... magnet (permanent magnet).

Claims (3)

Opening / closing means is provided in an outside air introduction portion that enables introduction of traveling wind from the opening at the front end of the vehicle body to the vehicle body front, and the opening / closing means is opened / closed by a driving means and sent to a radiator provided at the vehicle body front portion. In the radiator ventilation structure that controls the amount of the traveling wind,
The opening / closing means is connected to the rotating shaft side of the driving means so that the opening / closing means is rotatable, and the running wind is sent to the radiator, and the running wind is not sent to the radiator. The closed state to block, and the intermediate opening state between the open state and the closed state are switched to be selectable,
The driving means includes a stator and a rotor that is disposed on the radially inner side of the stator and supported by the rotating shaft that extends in the same direction as the rotating shaft,
The stator includes a stator core having a plurality of teeth protruding toward the rotor, and a coil that is attached to at least one of the plurality of teeth and rotates the rotor by magnetic flux generated during energization. ,
The rotor is composed of a rotor core attached to the rotating shaft and at least two magnets having different magnetic poles attached to positions facing each other on the outer peripheral surface of the rotor core,
On the outer peripheral surface of the rotor core, a non-magnetic pole part having no magnetic pole is formed between the magnets having the different magnetic poles,
The rotation direction of the rotor is switched by a control unit that controls energization of the coil,
Positioning and holding the opening / closing means at a predetermined position is performed at least by the attraction force between the magnet and the tooth portion magnetized by the magnet ,
The tooth portion is composed of a main tooth portion to which the coil is attached and the other two sub tooth portions of the main tooth portion,
The main tooth portion and the sub tooth portion are arranged at a position equally divided into three in the circumferential direction around the rotation axis of the rotor,
In the rotational position of the rotor, the attraction force in which one of the magnets and one of the sub-tooth portions attract each other and the attraction force with which the other of the magnets attracts the other of the sub-tooth portions are balanced. radiator ventilation structure but characterized that you have been configured to be retained while being positioned in the intermediate opening conditions. The positions of the two magnets are symmetrical with respect to a center line passing through the rotating shaft and the main tooth portion when the stator and the rotor are viewed from the axial direction of the rotating shaft of the rotor.
2. The radiator ventilation structure according to claim 1 , wherein the two magnets are provided in a range of 60 ° to 100 ° around the rotation axis on an outer peripheral surface of the rotor core . The pivot shaft radiator ventilation structure according to claim 1 or claim 2 wherein, characterized in that it is connected to the rotary shaft via a link mechanism.

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