JP2003056434A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator that can reliably hold an opening/closing device in a predetermined position without size increase. SOLUTION: The actuator 1 comprises a first lever 10 coupled to an output shaft 9 outside an actuator case 2 and turnable to a neutral position, a closing position and an opening position by respective turning movements of the output shaft 9, a second lever 11 located for engagement with the first lever 10 via a dimension of play and coupled to a driveshaft 17 for driving the opening/ closing device, and a reversing spring member 12 connected to the second lever 11 and a case of the opening/closing device to exert on the second lever 11 elastic forces for holding the second lever 11 respectively in the neutral position, closing position and opening position of the first lever 10.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for electrically opening and closing a switching device such as a bypass valve provided in an automobile engine. 2. Description of the Related Art As this type of actuator, there is known an actuator in which rotation of a motor is transmitted to an output shaft via a clutch built in a reduction mechanism, and a bypass valve is opened and closed by rotation of the output shaft. Have been. However, in the above-described actuator, a return spring is disposed on a drive shaft of the bypass valve to hold the bypass valve in an open state and a closed state, respectively. Because the force of the return spring is strong,
There has been a problem that the driving force of the actuator must be increased, and as a result, the size of the entire actuator is increased. [0004] It is an object of the present invention to provide an actuator capable of securely holding an opening and closing device at a predetermined position without increasing the size. According to the present invention, there is provided an actuator, comprising: an actuator case; an armature that is housed in the actuator case and that rotates forward and backward when energized. A motor having a shaft, a worm provided on the armature shaft of the motor, a wheel gear meshed with the worm, a damper member housed in the wheel gear and coupled to the wheel gear, and a hub member coupled to the damper member An output shaft coupled to the hub member, a first lever coupled to the output shaft outside the actuator case, and rotated to the neutral position, the closed position, and the open position by rotation of the output shaft, A second lever coupled to a drive shaft for driving the opening and closing device, the second lever being arranged to be engageable with the first lever via a play dimension, To the second lever at a neutral position, a closed position, and an open position of the first lever, respectively, to hold the second lever at the neutral position, the closed position, and the open position of the first lever. And a reversing spring member. In the actuator according to the present invention, when the first lever is rotated by the rotation of the output shaft,
The opening and closing device is driven by pushing a second lever which is engaged with the first lever via a play dimension. And when the first lever is in the neutral position, the closed position, and the open position,
Since the reversing spring member applies an elastic force for holding the second lever to the second lever, the first and second levers are
It is held by the reversing spring member at the neutral position, the closed position, and the open position. FIG. 1 to FIG. 3 show a first embodiment of an actuator according to the present invention. The illustrated actuator 1 mainly includes an actuator case 2, a cover 3, a motor 4, a worm 5, a wheel gear 6, a damper member 7, a hub member 8, an output shaft 9, a first lever 10,
The second lever 11 includes a reversing spring member 12. The actuator case 2 has a motor housing 2a and a speed reduction mechanism housing 2b. The motor 4 is fitted into the motor housing 2a by a motor fixing member 4b. A worm 5 rotatably supported by first and second bearings 13 and 14 is connected to an armature shaft 4 a provided in the motor 4.
The first and second bearings 13 and 14 are fixed to the actuator case 2. The wheel gear 6 is housed in the reduction mechanism housing 2b. The wheel gear 6 is meshed with the worm 5. A damper member 7 is fitted in the wheel gear 6. The damper member 7 is made of rubber, and is coupled in the rotation direction of the wheel gear 6. A hub member 8 is fitted to the damper member 7. The hub member 8 is made of metal, and is connected in the rotation direction of the damper member 7. The base end of the output shaft 9 is connected to the hub member 8. The base end of the output shaft 9 is rotatably supported by a third bearing 15. The tip of the output shaft 9
It is rotatably supported by a fourth bearing 16. The third bearing 15 is fixed to the cover 3. Cover 3
Are fixed to the actuator case 2 by screws 18. The fourth bearing 16 is provided in the actuator case 2
Is fixed via a shim 19 to the bottom of the. An output shaft insertion hole 2c is formed at the bottom of the actuator case 2. The output shaft 9 is formed with a lever mounting portion 9a that is disposed so as to protrude from the output shaft insertion hole 2c to the outside of the actuator case 2. The lever mounting portion 9a has a first
An output shaft fixing portion 10b formed in an oval shape is coupled to the base end of the lever 10. A pair of engaging projections 10a, 10a protruding in a rectangular shape toward the opening / closing device 30 side to which the actuator 1 is attached are formed on the side of the distal end of the first lever 10, respectively. As shown in FIG. 2, the opening / closing device 30 includes a second lever mounting portion 30b on a part of a case 30a.
Is formed. A connection hole 30c for connecting to the valve body is formed in the second lever attachment portion 30b. A spring locking hole 30d is formed near the connection hole 30c. Around the connection hole 30c, first and second stoppers 30e and 30f for restricting the rotation range of the second lever 11 are formed separately from each other. The second stopper 30f has a screw 30f for fine adjustment.
1 is provided. As shown in FIG. 2, the second lever 11
Is longer than the first lever 10. Near the base end of the second lever 11, a valve body drive shaft fixing hole 1 is provided.
1a is formed. A spring locking hole 11b is formed at the base end of the second lever 11. A pair of first and second stopper collision projections protruding in a rectangular shape in the same direction as the pair of engagement projections 10a, 10a of the first lever 10 are provided on the side of the distal end of the second lever 11. 11c, 11
d are respectively formed. In the second lever 11, the valve body drive shaft 17 is fixed to the valve body drive shaft fixing hole 11a, and the valve body drive shaft 17 is inserted into the connection hole 30c and coupled to the valve body. Since the second lever 11 is disposed with a play dimension between the pair of engagement projections 10a, 10a of the first lever 10, the engagement projections 10a, 10a when the first lever 10 rotates. The first stopper collision projection 11c is pressed by one of the
The first lever 10 and the first lever 10 within a stroke consisting of a range until the first stopper 30e collides with the first stopper 30e and a range where the second stopper collision projection 11d collides with the second stopper 30f of the opening / closing device 30. Rotated in the same direction. The motor 4 is electrically connected to an external valve control circuit. The valve control circuit is built in the engine controller. When a valve open signal is supplied from the engine controller to the valve control circuit, a current is supplied to the motor 4 in the positive direction from the valve control circuit, so that the armature shaft 4a is positively rotated by a predetermined amount, and the worm 5 is rotated. The wheel gear 6 is rotated in the forward direction by a predetermined angle, the hub member 8 is rotated through the damper member 7 in the forward direction together with the output shaft 9, and the first lever 10 is moved to the neutral position A. To the open position B. Thereafter, when a release signal is given from the engine controller to the valve control circuit, a current is supplied in the opposite direction to the motor 4 from the valve control circuit, so that the first lever 10 moves from the open position B to the neutral position A. It is turned back. When a valve closing signal is supplied from the engine controller to the valve control circuit, a current is supplied in the reverse direction to the motor 4 from the valve control circuit, so that the armature shaft 4a is reversely rotated by a predetermined amount, and the worm 5 is rotated. The wheel gear 6 is rotated by a predetermined angle in the reverse rotation direction via the shaft, and the hub member 8 is connected to the output shaft 9 via the damper member 7.
At the same time, the first lever 10 is turned from the neutral position A to the closed position C. Thereafter, when a release signal is given from the engine controller to the valve control circuit, a current is supplied to the motor 4 in the positive direction from the valve control circuit.
To the neutral position A and rotated. First lever 10
Is set to be larger than the rotation range of the valve element provided in the opening / closing device 30. The energization of the motor 4 is cut off by the position detection switch (not shown) provided in the actuator case 2 when the first lever 10 reaches the closed position C and the open position B, respectively. The reversing spring member 12 is provided with a spring main body 12a wound in a coil shape. A second lever locking portion 12b is formed at one end of the spring body 12a. A case locking portion 12c is formed at the other end of the spring body 12a. The reversing spring member 12
The second lever locking portion 12b is locked in the spring locking hole 11b of the second lever 11, and the case locking portion 12c is locked in the spring locking hole 30d of the opening / closing device 30. Reversing spring member 1
2 is a first lever 10 as shown in FIG.
When the second lever locking portion 12b and the case locking portion 12c are urged in a direction in which the second lever locking portion 12b and the case locking portion 12c are separated from each other by the elastic force accumulated in the spring body portion 12a, when the second position reaches the neutral position A. Is held at the neutral position A of the first lever 10. FIG.
As shown in (b), the first lever 10 is in the open position B.
, The second lever locking portion 12b and the case locking portion 12 are elastically accumulated in the spring body portion 12a.
and c are urged away from each other,
The second lever 11 is held at the open position B of the first lever 10. As shown in FIG. 3C, when the first lever 10 reaches the closed position C, the reversing spring member 12 is moved to the second position by the elastic force accumulated in the spring body 12a.
The second lever 11 is held at the closed position C of the first lever 10 by being urged in a direction in which the lever locking portion 12b and the case locking portion 12c separate from each other. The actuator 1 having such a structure
The actuator case 2 is fixed near the opening / closing device 30, and the motor 4 is electrically connected to a valve control circuit and mounted on the vehicle body. At this time, the second lever 11 is assembled to the first lever 10 in a state where the first lever 10 is at the neutral position A. Therefore, the second lever 11 is held at the neutral position A of the first lever 10. When a valve open signal is supplied from the engine controller to the valve control circuit, a current is supplied to the motor 4 in the positive direction from the valve control circuit, so that the first lever 10 rotates from the neutral position A to the open position B. Start moving. Then, when the second lever locking portion 12b and the case locking portion 12c approach each other, the reversing spring member 12 is elastically deformed while the elastic force is accumulated in the spring main body portion 12a, and the first lever 11 of the second lever 11 is deformed. Stopper collision projection 11c
Is rotated until it collides with the first stopper 30e of the opening / closing device 30, the valve body is opened, the power supply to the motor 4 is cut off by the position detection switch, and the first lever 10 stops at the open position B. . When the first lever 10 reaches the open position B, the second lever locking portion 12b and the case locking portion 12c are elastically accumulated in the spring body portion 12a.
Are biased in directions away from each other, whereby the second lever 11 is held at the open position B of the first lever 10 by the reversing spring member 12. Thereafter, when a release signal is given from the engine controller to the valve control circuit, a current is supplied in the opposite direction to the motor 4 from the valve control circuit, so that the first lever 10 moves from the open position B to the neutral position A. It is turned back and in the neutral position A,
It is held again by the reversing spring member 12. When a valve close signal is supplied from the engine controller to the valve control circuit, a current is supplied to the motor 4 in the reverse direction from the valve control circuit, so that the first lever 10 moves from the neutral position A to the closed position C. Start turning toward. Then, when the second lever locking portion 12b and the case locking portion 12c approach each other, the reversing spring member 12 is elastically deformed while an elastic force is accumulated in the spring main body portion 12a, and the first lever 11 Stopper collision projection 11c
Is rotated until it collides with the first stopper 30e of the opening / closing device 30, the valve body is opened, the power supply to the motor 4 is cut off by the position detection switch, and the first lever 10 stops at the closed position C. . When the first lever 10 reaches the closed position C, the second lever locking portion 12b and the case locking portion 12c are elastically accumulated in the spring body 12a.
Are biased in directions away from each other, whereby the second lever 11 is held at the closed position C of the first lever 10 by the reversing spring member 12. Thereafter, when a release signal is supplied from the engine controller to the valve control circuit, a current is supplied to the motor 4 in the positive direction from the valve control circuit, so that the first lever 10 moves from the closed position C to the neutral position A. It is turned back and in the neutral position A,
It is held again by the reversing spring member 12. FIG. 4 shows a second embodiment of the actuator according to the present invention. In this case, the pair of engagement projections 10a, 10a of the first lever 10
1 and the other parts are the same as in the first embodiment, and are therefore omitted. The second lever 11 is shown in FIG.
As shown in (a), (b) and (c), when the first lever 10 rotates, the second stopper is pressed by one of the engagement protrusions 10a and 10a. The range until the collision protrusion 11d collides with the second stopper 30f of the opening / closing device 30 and the first stopper collision protrusion 11c
Is rotated in the same direction as the first lever 10 within a stroke consisting of a range until the first lever 30 collides with the first stopper 30e of the opening / closing device 30. As shown in FIG.
When the first lever 10 reaches the neutral position A, the direction in which the second lever locking portion 12b and the case locking portion 12c separate from each other due to the elastic force accumulated in the spring body portion 12a of the reversing spring member 12. The second is
Is held at the neutral position A of the first lever 10. As shown in FIG. 3B, when the first lever 10 reaches the closed position C, the elastic force accumulated in the spring body 12a of the reversing spring member 12 causes the second lever locking portion 12b And the case locking portion 12c are urged in the directions in which the second lever 11
Is held at the closed position C of the first lever 10. As shown in FIG. 4C, when the first lever 10 reaches the open position B, the spring body 12 of the reversing spring member 12
a of the second lever locking portion 12
The second lever 11 is held at the open position B of the first lever 10 by urging the b and the case locking portion 12c away from each other. As described above, according to the actuator of the present invention, when the first lever is rotated by the rotation of the output shaft, the first lever is provided with a play dimension. The opening / closing device is driven by pushing the second lever that is engaged through the opening / closing device. When the first lever is at the neutral position, the closed position, or the open position, the reversing spring member applies an elastic force for holding the second lever to the second lever. Is held by the reversing spring member at the neutral position, the closed position, and the open position. Therefore, there is an excellent effect that the opening / closing device can be securely held at a predetermined position without increasing the size.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view for explaining an assembling relationship of components in a first embodiment of an actuator according to the present invention. FIG. 2 is an external perspective view for explaining an assembling relationship between each lever and a reversing spring member in the actuator shown in FIG. 1; FIG. 3A is a state diagram when the first lever in the actuator shown in FIG. 1 is at a neutral position, and FIG.
FIG. 3 is a state diagram when the first lever in the actuator shown in FIG. 1 is in the open position, and FIG. 3C is a state diagram when the first lever in the actuator shown in FIG. 1 is in the closed position. . FIG. 4A shows a second example of the actuator according to the present invention.
FIG. 4B is a state diagram when the first lever is in the neutral position in the embodiment, FIG. 4B is a state diagram when the first lever shown in FIG. 4A is in the open position, and FIG. It is a state diagram when the 1st shown lever is in a closed position. [Description of Signs] 1 Actuator 2 Actuator case 4 Motor 4a Armature shaft 5 Worm 6 Wheel gear 7 Damper member 8 Hub member 9 Output shaft 10 First lever 11 Second lever 12 Reversing spring member 17 Drive shaft (valve drive) axis)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // F16K 31/04 F16K 31/04 K F02D 33/00 318G F-term (reference) 3H062 BB04 CC01 DD13 EE07 HH10 3J009 DA17 EA06 EA19 EA23 EA32 ED05 FA10 3J062 AA02 AB02 AB26 AC07 BA12 CG83 5H605 BB05 CC01 CC03 CC08 DD09 EA19 FF06 GG06 5H607 AA12 BB01 CC03 CC05 DD19 EE32 EE36 EE54 EE60 FF13 FF22

Claims (1)

Claims: 1. An actuator case, a motor housed in the actuator case and having an armature shaft that rotates forward and backward when energized, a worm provided on the armature shaft of the motor, A wheel gear meshed with a worm; a damper member housed in the wheel gear and coupled to the wheel gear; a hub member coupled to the damper member; an output shaft coupled to the hub member; A first lever coupled to the output shaft outside the actuator case, and pivoted to a neutral position, a closed position, and an open position by rotation of the output shaft; A second lever coupled to a drive shaft for driving the opening / closing device, the second lever being provided in the second lever and the opening / closing device. A reversing spring member connected to the case and applying an elastic force to the second lever at the neutral position, the closed position, and the open position of the first lever to hold the second lever, respectively. Actuator.