JP2001225664A - Actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an actuator having superior assembling workability. SOLUTION: This actuator is provided with first and second spring lock parts 8d, 9d locked to respective first and second holder lock parts 7b, 7c formed in the both ends of a torsion waiting spring 7 on a rotational movement locus of a wheel gear side presser part 4e of a wheel gear 4 and an output shaft side presser part 6d of a rotational movement member 6; and first and second spring holders 8, 9 having pressure faces 8f, 9f abuttable on collision parts 4f, 6e and 4g, 6f formed in one end and the other end in respective rotational movement direction sides of the wheel gear side presser part 4e of the wheel gear 4 and the output side presser part 6d of the rotational movement member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator used in a switching drive device for switching between two-wheel drive and four-wheel drive or switching between a neutral position and a drive position.

[0002]

2. Description of the Related Art As an actuator of this type, an actuator described in Japanese Patent Application Laid-Open No. 7-179138 is known.

[0003]

In the above actuator, the end of the spiral ring has to be hooked directly to the second part of the first plate, so that there is a problem that the assembling workability is poor.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an actuator having good assembling workability.

[0005]

Configuration of the Invention

[0006]

According to a first aspect of the present invention, there is provided an actuator comprising: a motor having an armature shaft which rotates when energized; a worm formed on the armature shaft of the motor; and a wheel gear side pressing portion. ,
A wheel gear meshed with the worm and rotating, an output shaft rotatably supported in the actuator case and rotatably supported in the actuator case, and a turn coupled to the output shaft to form an output shaft side pressing portion. A torsion wait spring, which is disposed between the moving member, the wheel gear and the rotating member, and has first and second holder locking portions formed at both ends, a wheel gear side pressing portion of the wheel gear, and a rotating member A first spring locking portion locked to the first holder locking portion of the torsion waiting spring on a rotation locus of the output shaft side pressing portion, a wheel gear side pressing portion and an output shaft side pressing portion. A first spring holder having a pressing surface formed at one end on the rotation direction side and capable of contacting a collision portion, and disposed between the wheel gear and the torsion waiting spring; Independently press the wheel gear on the wheel gear side. Spring locking portion locked to the second holder locking portion of the torsion waiting spring on the rotation locus of the output shaft side pressing portion of the rotating member and the rotating member, the wheel gear side pressing portion and the output shaft A second spring holder having a pressing surface formed at the other end of the side pressing portion on the rotation direction side and capable of contacting a collision portion, and disposed between the torsion waiting spring and the rotating member; An output cam protruding out of the actuator case and coupled to an end of the output shaft is provided.

In the actuator according to a second aspect of the present invention, in addition to the configuration of the first aspect, the output shaft side pressing portion of the rotating member is formed inside the rotation locus of the wheel gear side pressing portion of the wheel gear. The output shaft side pressing portion and the wheel gear side pressing portion are always in a non-contact state even when the rotating member and the wheel gear rotate.

In the actuator according to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the first spring holder is disposed on an inner peripheral portion of the torsion waiting spring to prevent the torsion waiting spring from falling down. A first cylindrical guide is formed on the inner peripheral portion of the torsion waiting spring in a pair with the first cylindrical guide to prevent the torsion waiting spring from falling down. And a second cylindrical guide for forming the second guide.

In the actuator according to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the first spring holder has a torsion waiting spring for preventing the torsion waiting spring extending outward from the outer periphery of the one end surface of the first cylindrical guide. The first flange is formed, and the second spring holder is formed with a second flange for preventing a torsion waiting spring extending outward from an outer periphery of one end surface of the second cylindrical guide. It is characterized by:

In the actuator according to a fifth aspect of the present invention, in addition to the configuration of the first, second, third or fourth aspect, the rotating member is provided with first and second case collision portions, and the actuator case has Includes a wheel gear, an output shaft, a rotating member, a first spring holder, a torsion waiting spring, and a second spring holder, and the first and second case collisions caused by the rotation of the rotating member against the actuator case. Due to the collision of the department,
It is characterized in that a stroke regulating projection for regulating the rotation range of the rotating member is formed.

[0011]

In the actuator according to the first, second, third, fourth and fifth aspects of the present invention, the first spring of the torsion waiting spring is provided.
The first spring holder having the first spring locking portion to which the holder locking portion is locked is provided on the rotation locus of the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the rotating member. First
The pressing surface provided on the first spring holder has a pressing surface provided on the first spring holder, and the elastic force of the torsion waiting spring causes the pressing portion of the wheel gear on the wheel gear side and the pressing portion of the rotating member on the output shaft side. Are pressed against the collision portions formed at one end on the rotation direction side. The second spring holder having the second spring locking portion in which the second holder locking portion of the torsion wait spring is locked is provided on the wheel gear side pressing portion of the wheel gear and on the output shaft side of the rotating member. Since the second spring locking portion is disposed on the rotation locus of the pressing portion, the pressing surface provided on the second spring holder has the elastic force of the torsion waiting spring, and the wheel gear side pressing portion of the wheel gear. And a collision portion formed at the other end in the rotation direction side of the output shaft side pressing portion of the rotation member. Therefore, the torsion waiting spring is not directly locked to the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the rotating member, and the first and second spring locking of the first and second spring holders. By simply arranging the parts on the rotation trajectory of the wheel gear side pressing part of the wheel gear and the output shaft side pressing part of the rotating member, locking to the torsion waiting spring is performed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the actuator according to the present invention, an actuator which can be used in a two-wheel / four-wheel switching driving device will be described.

In general, in a shift mechanism associated with a two-wheel / four-wheel switching driving device, when a slider is operated by a shift fork fixed to a fork shaft to switch from two-wheel drive to four-wheel drive, the slider is used. Is moved in one direction, and the two gears are spline-fitted. At this time, if the phases of the two gears are shifted, spline fitting cannot be performed. Therefore, the switching drive device is provided with a waiting mechanism composed of a spring, and waits for the movement of the slider until the phases of the two gears match. It has become.

When switching from four-wheel drive to two-wheel drive, the slider is moved in the other direction to release the spline engagement between the two gears. At this time, if the spline fitting is hard, it cannot be released, so that the movement of the slider is waited by the action of the waiting mechanism until the spline fitting is loosened.

The actuator of the present invention is used as a drive source of a shift fork for operating a slider.

FIGS. 1 to 17 show an embodiment of the actuator according to the present invention.

The illustrated actuator 1 mainly includes
It comprises a motor 2, a worm 3, a wheel gear 4, an output shaft 5, a rotating member 6, a torsion waiting spring 7, a first spring holder 8, a second spring holder 9, and an actuator case 10.

The motor 2 is fixed to a lower case 11 which forms a part of an actuator case 10, and is electrically connected to a 2WD / 4WD switching control circuit (not shown). The motor 2 is provided with an armature shaft 2 a protruding into the lower case 11. A worm 3 is formed in the lower case 11 on the armature shaft 2a. The armature shaft 2a is rotated forward when the 2WD 4WD switch provided in the 2WD 4WD switching control circuit is switched to the 4WD mode. On the contrary, the 2WD 4WD switch is set to the 2WD mode. Is rotated in reverse.

A wheel gear 4 is engaged with the worm 3 of the armature shaft 2a. Wheel gear 4 has
As shown in FIG. 2, helical teeth 4b meshed with the worm 3 are formed on the outer peripheral edge of the wheel gear body 4a, and an output shaft insertion hole 4c is formed in the center of the wheel gear body 4a. Is formed. Output shaft insertion hole 4c
Is a wheel gear body 4a and the wheel gear body 4
The output shaft insertion hole 4c is inserted through the output shaft 5 so that the wheel gear 4 is rotatable by the output shaft 5. Supported.

The wheel gear 4 includes a wheel gear body 4
A wheel gear-side pressing portion 4e is formed on the outer edge of a and protrudes in the form of an arc-shaped plate extending in the circumferential direction from the lower surface 4a1. The wheel gear-side pressing portion 4e includes:
A first collision portion 4f is formed at one end, and a second collision portion 4g is formed at the other end.

When the worm 3 of the armature shaft 2a makes a forward rotation, the wheel gear 4 moves about 180 degrees counterclockwise in FIG.
When the worm 3 rotates in the reverse direction, the worm 3 rotates clockwise in FIG. 10 by about 180 degrees.

The output shaft 5 has a base end side of the output shaft main body 5a rotatably supported by a bottom plate 11a of a lower case 11 forming a part of the actuator case 10, and a tip end of the output shaft main body 5a. Actuator case 1
0 is rotatably supported by an upper case 12 forming another part. The output shaft 5 has a cam shaft 5b having a shaft center eccentric to the shaft center of the output shaft body 5a formed at the base end of the output shaft body 5a protruding from the lower case 11. The cam shaft 5b The output cam 13 is fixed. The output cam 13 is used to move a shift fork (not shown).

A pin 14 is inserted into and fixed to the output shaft 5 on the base end side of the output shaft main body 5a, and a turning member 6 is locked to the pin 14. The turning member 6 The output shaft 5 is integrally connected. The turning member 6 is provided with a disc-shaped turning member main body 6a, and a cylindrical tube portion 6b is formed at the center of the turning member main body 6a so as to protrude. An output shaft hole 6c is formed at the center of each of the rotating member main body 6a and the cylindrical portion 6b, and the output shaft hole 6c is inserted into the output shaft 5.

An output shaft side pressing portion 6d is formed on the upper surface of the rotating member body 6a and protrudes in the form of an arc-shaped plate protruding in the circumferential direction near the outer periphery of the rotating member body 6a. . The output shaft side pressing portion 6d has a third collision portion 6 at one end.
e is formed, and a fourth collision portion 6f is formed at the other end.

The output shaft side pressing portion 6d of the rotating member 6 is disposed inside the rotation locus of the wheel gear side pressing portion 4e of the wheel gear 4 in a non-contact manner with the wheel gear side pressing portion 4e. When the rotational position coincides with the wheel gear side pressing portion 4e, the third collision portion 6e is arranged alongside the first collision portion 4f of the wheel gear side pressing portion 4e, and the fourth collision portion 6f Are arranged side by side with the second collision portion 4g of the wheel gear side pressing portion 4e.

The turning member body 6a of the turning member 6 has a turning range restricting portion cut away from the outer edge of the turning member body 6a in an arc-shaped concave shape on the opposite side of the output shaft side pressing portion 6d. 6g, and a first end is provided at one end of the rotation range restricting portion 6g.
Is formed, and the rotation range restricting portion 6g is formed.
A second case collision portion 6g2 is formed at the other end of the second case.

Between the wheel gear 4 and the rotating member 6,
A first spring holder 8, a torsion waiting spring 7, and a second spring holder 9 are arranged in this order from the wheel gear 4 side to the lower side in FIG.

The torsion waiting spring 7 is a torsion coil spring having an inner diameter larger than the outer diameter of each of the cylindrical portion 4 d of the wheel gear 4 and the cylindrical portion 6 b of the rotating member 6. As shown in FIG. 2, a first holder engaging portion 7b having a hook shape is formed at an upper end portion of a spirally wound spring body 7a, and a hook shape is formed at a lower end portion of the spring body 7a. The formed second holder locking portion 7c is formed.

The first spring holder 8 has a first cylindrical guide 8b having a cylindrical shape, and a second cylindrical guide 8b extending outward from the outer periphery of one end surface (the outer periphery of the upper end surface in FIG. 1) of the first cylindrical guide 8b. 1
Is formed, and a flange 8c that protrudes in a fan shape from the outer edge of the first flange 8a is formed, and a first spring locking portion 8d that protrudes downward from the flange 8c is formed. ing. In the center of the first flange 8a and the first cylindrical guide 8b, a cylindrical portion insertion hole 8e having an inner diameter slightly larger than the outer diameter of the cylindrical portion 4d of the wheel gear 4 is formed. Since the first cylindrical guide 8b is disposed on the inner peripheral portion of the spring main body 7a of the torsion waiting spring 7, it has a function of preventing the spring main body 7a from falling down when elastically deformed. Also, the first flange 8a
Prevents the torsion waiting spring 7 from coming off.

The first spring locking portion 8d has a flat pressing surface opposite to the hook receiving shape portion where the first holder locking portion 7b of the torsion waiting spring 7 is locked. 8f
Are formed. A first collision portion 4f formed on the wheel gear side pressing portion 4e of the wheel gear 4 and a third collision portion 6e formed on the output shaft side pressing portion 6d of the rotating member 6 are formed on the pressing surface 8f. collide.

The first spring locking portion 8d includes a first collision portion 4f formed on the wheel gear side pressing portion 4e of the wheel gear 4 on the pressing surface 8f and the output shaft side pressing portion 6 of the rotating member 6.
When the third collision portion 6e formed in d is colliding and pressed, the third collision portion 6e is used to elastically deform the torsion waiting spring 7 via the first holder locking portion 7b.

At this time, since the first holder locking portion 7b of the torsion waiting spring 7 is not directly locked to the wheel gear side pressing portion 4e of the wheel gear 4, the wheel gear side pressing portion 4e of the wheel gear 4 does not. The volume is reduced. Also,
Since the flange 8c is formed at the end of the first spring locking portion 8d of the torsion waiting spring 7 to which the first holder locking portion 7b is locked, the flange 8c causes the first of the torsion waiting spring 7 to move. Is not easily detached from the first spring locking portion 8d.

The first spring holder 8 includes a first flange 8
a is disposed below the wheel gear main body 4a of the wheel gear 4 in FIG. 1 and the cylindrical portion insertion hole 8e is disposed outside the cylindrical portion 4d of the wheel gear 4. 4 is supported so as to be rotatable independently. Since the first holder locking portion 7b of the torsion waiting spring 7 is locked to the first spring locking portion 8d,
When the torsion waiting spring 7 is elastically deformed so as to reduce the inner diameter of the spring main body 7a, the spring main body 7a is prevented from contacting the cylindrical portion 4d of the wheel gear 4.

The second spring holder 9 has a second cylindrical guide 9b having a cylindrical shape, and a second cylindrical guide 9b extending outward from one end surface outer periphery (the lower end surface outer periphery in FIG. 1) of the second cylindrical guide 9b. 2
And a second spring engaging portion 9d projecting from the outer edge of the second flange 9a in a fan shape and projecting upward in FIG. In the center of the second flange 9a and the second cylindrical guide 9b, a cylindrical portion insertion hole 9e having an inner diameter slightly larger than the outer diameter of the cylindrical portion 6b of the rotating member 6 is formed. . Since the second cylindrical guide 9b is arranged on the inner peripheral portion of the spring main body 7a of the torsion waiting spring 7, it has a function of preventing the spring main body 7a from falling down when it is elastically deformed. Also,
The second flange 9 a serves as a stopper for the torsion waiting spring 7.

The second spring locking portion 9d has a flat pressing surface opposite to the hook receiving portion where the second holder locking portion 7c of the torsion wait spring 7 is locked. 9f
Are formed. On this pressing surface 9f, a second collision portion 4g formed on the wheel gear side pressing portion 4e of the wheel gear 4 and a fourth collision portion 6f formed on the output shaft side pressing portion 6d of the rotating member 6 are provided. collide.

The second spring locking portion 9d has a second collision portion 4g formed on the wheel gear side pressing portion 4e of the wheel gear 4 on the pressing surface 9f and the output shaft side pressing portion 6 of the rotating member 6.
When the fourth collision portion 6f formed in d is collided and pressed, the fourth collision portion 6f is used to elastically deform the torsion waiting spring 7 via the second holder locking portion 7c.

At this time, since the second holder locking portion 7c of the torsion waiting spring 7 is not directly locked to the output shaft side pressing portion 6d of the rotating member 6, the output shaft side pressing portion of the rotating member 6 is not used. 6
The volume of d is reduced.

The second spring holder 9 has a second flange 9
a is disposed on the upper side of the rotating member main body 6a of the rotating member 6 in FIG. 1 and the cylindrical portion insertion hole 9e is disposed outside the cylindrical portion 6b of the rotating member 6, whereby the second spring holder is formed. Reference numeral 9 is rotatably supported by the cylindrical portion 6b. Since the second holder locking portion 7c of the torsion waiting spring 7 is locked to the second spring locking portion 9d, the torsion waiting spring 7 is elastic so as to reduce the inner diameter of the spring main body 7a. When deformed, the spring body 7 is attached to the cylindrical portion 6b of the rotating member 6.
a does not touch.

The output shaft side pressing portion 6d of the rotating member 6 is formed inside the turning locus of the wheel gear side pressing portion 4e of the wheel gear 4. The output shaft side pressing portion 6d and the wheel gear side pressing portion 4e are always in a non-contact state. In addition, the first spring locking portions 8 of the first spring holder 8 are respectively provided on the rotation trajectories of the wheel gear side pressing portion 4e and the output shaft side pressing portion 6d.
d and a second spring locking portion 9d of the second spring holder 9 are arranged. The first spring locking portion 8d of the first spring holder 8 is fitted into the first holder locking portion 7b of the torsion waiting spring 7, and the second holder locking portion 7c of the torsion waiting spring 7 is inserted into the second holder locking portion 7c. Only by fitting the second spring locking portion 9d of the second spring holder 9 against the torsion waiting spring 7
Since the first and second spring holders 8 and 9 are respectively locked, the assembling is extremely simple.

The actuator case 10 includes a lower case 11 and an upper case 12 attached to the lower case 11. The lower case 11 has the output shaft 5 rotatable at a substantially central portion of a bottom plate 11a. An output shaft supporting portion 11c for supporting is formed. In the upper case 12, an output shaft support portion 12b for rotatably supporting the distal end portion of the output shaft 5 is formed substantially at the center of the top plate 12a.

In the actuator 1 having such a structure, the output cam 13 is engaged with the shift fork, and is mounted close to a two-wheel drive / four-wheel switching mechanism (not shown).
The vehicle is electrically connected to a four-wheel drive switching control circuit and mounted on a vehicle.

In the actuator 1, if the two-wheel drive four-wheel changeover switch is not switched and the two-wheel drive four-wheel changeover control circuit does not energize the motor 2, as shown in FIG. Is located at the return position A1 and its first collision portion 4f
Are in contact with the pressing surface 8f formed on the first spring engaging portion 8d of the first spring holder 8, and the output shaft 5 and the rotating member 6 are moved from the output shaft side pressing portion 6d to the return position B1. So,
The first case collision portion 6g1 is in contact with the projection 11b of the lower case 11, and the fourth case collision portion 6f
Abuts against a pressing surface 9f formed on the second spring engaging portion 9d of the second spring holder 9, and the 2WD / 4WD switching mechanism is 2
It is in the driving position.

At this time, the first holder locking portion 7b and the second holder locking portion 7c of the torsion waiting spring 7 are connected to the first spring locking portion 8d and the second spring locking portion 8d of the first spring holder 8. A biasing force is applied in a direction to bring the second spring locking portions 9d of the spring holder 9 closer to each other, the first spring locking portion 8d of the first spring holder 8 is at the position C1, and the second spring holder The 9 second spring locking portion 9d is at the position D1.

When the two-wheel drive mode is switched to two-wheel drive by the two-wheel drive four-wheel drive switching mechanism, the two-wheel drive four-wheel drive switch is switched from the two-wheel drive mode to four
When the mode is switched to the driving mode, the motor 2 is energized in the forward rotation direction from the 2WD 4WD switching control circuit, so that the wheel gear 4 rotates counterclockwise in FIG. 3 as shown in FIG. And the wheel gear side pressing portion 4 of the wheel gear 4
e, the second collision portion 4g collides against the pressing surface 9f of the second spring engagement portion 9d of the second spring holder 9, and the first spring holder is provided with an urging force from the torsion waiting spring 7. 8, the first spring locking portion 8d rotates counterclockwise,
Since the pressing surface 8f collides with and presses the third collision portion 6e of the output shaft side pressing portion 6d of the rotating member 6, the wheel gear 4 is moved from the position A1 to the position A2. The first spring holder 8 is rotated from a position C1 in FIG. 3 to a position C2 in FIG. At this time, the first collision portion 4f of the wheel gear side pressing portion 4e and the third collision portion 6e of the output shaft side pressing portion 6d abut on the pressing surface 8f,
The second collision portion 4g of the wheel gear side pressing portion 4e and the fourth collision portion 6f of the output shaft side pressing portion 6d are in contact with the pressing surface 9f.

When the wheel gear 4 is still rotated, as shown in FIG. 5, the wheel gear side pressing portion 4e of the wheel gear 4 is rotated to the position A3, and the output shaft side pressing of the rotating member 6 is performed. The portion 6d is also rotated to the position B3 in the same manner as the wheel gear side pressing portion 4e of the wheel gear 4 via the second spring locking portion 9d, the torsion waiting spring 7 and the first spring locking portion 8d, and 4, the second collision portion 4g of the wheel gear side pressing portion 4e and the output shaft side pressing portion 6 of the rotating member 6.
d, the second spring holder 9 is rotated to the position D3 by the pressing of the fourth collision portion 6f, and the first spring holder 8 is the first holder of the torsion waiting spring 7. It is urged by the locking portion 7b and rotated to the position C3. At this time, the output shaft 5 is moved from the position B1 in FIGS.
3 is turned.

Here, in the shift mechanism, if the two gears spline-fitted by the slider moved by the shift fork are out of phase, the shift fork cannot move and the output cam 13 is restrained. . For this reason, since the wheel gear 4 continues to rotate counterclockwise in FIG. 5, the wheel gear side pressing portion 4e of the wheel gear 4 is rotated to the position A4 as shown in FIG. The output shaft side pressing portion 6d of the rotating member 6 coupled to the output shaft 5 remains stopped at the position B3. on the other hand,
The second spring holder 9 rotates from the position D3 to the position D4 when the pressing surface 9f of the second spring locking portion 9d is pressed by the second collision portion 4g of the wheel gear side pressing portion 4e of the wheel gear 4. The first spring holder 8 is provided with a first spring locking portion 8.
The pressing surface 8f of d is at the position C3 while colliding with the third collision portion 6e of the output shaft side pressing portion 6d of the rotating member 6.

Since the wheel gear 4 continues to rotate counterclockwise in FIG. 6, the wheel gear side pressing portion 4e of the wheel gear 4 is rotated to the stroke end position A5 as shown in FIG. In the second spring holder 9, the pressing surface 9 f of the second spring locking portion 9 d is pressed by the second collision portion 4 g of the wheel gear side pressing portion 4 e of the wheel gear 4 to the position D.
Although it is rotated from 4 to the position D5, the output shaft side pressing portion 6d of the rotating member 6 remains stopped at the position B3. The torsion waiting spring 7 is elastically deformed and the urging force is accumulated since the second spring locking portion 9d of the second spring holder 9 is rotated to the position D5.

When the phases of the two gears match,
As shown in FIG. 8, the restraint of the output cam 13 is released, and when the wheel gear-side pressing portion 4e of the wheel gear 4 is at the stroke end position A5 and the second spring holder 9 is at the position D5, twisting is performed. Due to the urging force applied from the first holder locking portion 7b of the waiting spring 7, the first spring locking portion 8d of the first spring holder 8 is moved from the position C3 to the position C4.
When the first collision portion 4f is pressed by the pressing surface 8f formed on the first spring engagement portion 8d of the first spring holder 8, the rotation member 6 Is rotated to the stroke end position B4 of the output shaft side pressing portion 6d that collides with the convex portion 11b of the lower case 11, and the output shaft 5 rotates from the position B3 to the position B4, and at a predetermined position therebetween. The rotating output cam 13 moves the shift fork, and the two-wheel drive four-wheel switching mechanism shifts the four-wheel drive
It is switched to the drive position.

The 2WD 4WD switch is set to 4 from the 2WD mode.
If the two gears are not out of phase when switched to the driving mode, the process skips from the state shown in FIG. 5 to the state shown in FIG. From the position A3 to the position A3 ', the output shaft 5 and the output shaft side pressing portion 6d of the rotating member 6 are moved from the position B3 to the wheel gear side pressing portion 4 of the wheel gear 4.
e, is rotated to the same position B4 as the position A3 ', and the output cam 13 rotating at a predetermined position therebetween moves the shift fork to switch the two-wheel drive four-wheel switching mechanism to the four-wheel drive position. . The second spring holder 9 is provided with a second spring locking portion 9d.
Is rotated from the position D3 to the position D4 ′, and the first spring holder 8 is moved from the position C3 to the position C4 from the position C3.
Is rotated until. The output shaft 5 and the rotating member 6 are
The second case collision portion 6g2 is formed by the convex portion 11 of the lower case 11.
The rotation stops at the stroke end position B4 of the output shaft side pressing portion 6d that collides with b.

Then, as shown in FIG. 10, the output shaft side pressing portion 6d of the rotating member 6 is moved to the stroke end position B4.
With the wheel gear 4 stopped, the wheel gear side pressing portion 4e is rotated from the position A3 'to the stroke end position A5, and the second spring locking portion 9 of the second spring holder 9 is rotated.
d is rotated from position D4 'to position D5. The first spring locking portion 8d of the first spring holder 8 stops at the position C4.

When the 2WD 4WD switch is set to 2 from the 4WD mode
When the mode is switched to the driving mode, the motor 2 is energized in the reverse rotation direction by the 2WD / 4WD switching control circuit, so that the wheel gear 4 starts rotating clockwise in FIG. At this time, if the shift fork cannot move due to the spline fitting of the two gears, the output cam 13 is restrained as shown in FIG. The shaft-side pressing portion 6d does not move while stopped at the stroke end position B4, and the second spring holder 9
The pressing surface 9f of the second spring locking portion 9d is
d from the position D5 colliding with the fourth collision portion 6f to the position D5
', And the wheel gear 4 is rotated by returning the wheel gear side pressing portion 4e to the return position A1.
The first collision portion 4f formed on the wheel gear side pressing portion 4e of the wheel gear 4 has the pressing surface 8 of the first spring locking portion 8d.
In the first spring holder 8 against which f has collided, the first spring locking portion 8d is pressed and rotated to the position C1, and the torsion waiting spring 7 is elastically deformed, and the urging force is accumulated.

Then, the torsion waiting spring 7 connects the first spring engaging portion 8d of the first spring holder 8 to the second spring holder 9
Is applied in a direction approaching the second spring locking portion 9d. When the spline fitting between the two gears is loosened, the restraint on the output cam 13 is released, and the torsion waiting spring 7 is released.
12, the second spring locking portion 9d of the second spring holder 9 is rotated from the position D5 'to the position D1, and the fourth collision portion 6f is moved to the second position, as shown in FIG. The rotating member 6 that is in contact with the pressing surface 9f formed on the second spring locking portion 9d of the spring holder 9 causes the output shaft side pressing portion 6d to return from the position B4 to the stroke end position B1 and rotate.
The output cam 13 rotating at a predetermined position in the meantime moves the shift fork, and the two-wheel drive four-wheel switching mechanism is switched from the four-wheel drive position to the two-wheel drive position. Note that the output shaft 5 and the rotating member 6 are such that the first case collision portion 6g1 is
The rotation stops at the return position B1 of the output shaft side pressing portion 6d colliding with the convex portion 11b.

From the state shown in FIG. 10 in which the two-wheel drive is switched to four-wheel drive by the two-wheel drive four-wheel switching mechanism, the two-wheel drive four-wheel switch is switched from the four-wheel drive mode to the two-wheel drive mode, and the wheel gear 4 is set to the timepiece in FIG. When the spline fitting of the two gears is loose at that time, the state changes from FIG. 10 to FIG. 13 and the wheel gear side pressing portion 4e of the wheel gear 4
From the stroke end position A5 to the same position A as the stroke end position B4 of the output shaft side pressing portion 6d of the rotating member 6.
4 ', and the wheel gear 4 returns clockwise in FIG. 13 and continues to rotate. The wheel gear side pressing portion 4e of the wheel gear 4 is moved from the stroke end position A5 to the position A.
4 ′, the second rotation of the torsion waiting spring 7
In the second spring holder 9 to which the urging force is applied from the holder locking portion 7c, the second spring locking portion 9d is rotated from the position D5 to the position D5 '.

As the wheel gear 4 continues to return and rotate, as shown in FIG. 14, the wheel gear 4 pushes the wheel gear side pressing portion 4e to the position A2, and the rotating member 6 pushes the output shaft side. The pressing portion 6d is rotated to the return position B1, respectively, the first spring holder 8 has its first spring locking portion 8d from position C4 to position C2, and the second spring holder 9 has its second spring The spring locking portion 9d is rotated from the position D5 'to the position D1. At the return position B1, the first case collision portion 6g1 collides with the projection 11b of the lower case 11, and the output shaft pressing portion 6d stops. In the meantime, the output cam 13 moves the shift fork, and the two-wheel drive four-wheel switching mechanism is switched from the four-wheel drive position to the two-wheel drive position.

As shown in FIG. 15, the wheel gear-side pressing portion 4e of the wheel gear 4 is returned and rotated from the position A2 to the return position A1 so that the wheel gear 4 continues to return and rotate. 1 spring holder 8 is at position C
2 to the position C1.

As described above, in the actuator 1,
The first spring holder 8 having the first spring locking portion 8d in which the first holder locking portion 7b of the torsion waiting spring 7 is locked,
By disposing the first spring engaging portion 8d on the rotation locus of the wheel gear side pressing portion 4e of the wheel gear 4 and the output shaft side pressing portion 6d of the rotating member 6, the first spring holder 8 Is formed at one end of the wheel gear-side pressing portion 4e of the wheel gear 4 and the output shaft-side pressing portion 6d of the rotating member 6 on one side in the rotation direction by the elastic force of the torsion waiting spring 7. The pressed collision portions 4f and 6e are pressed. The second spring holder 9 having the second spring locking portion 9d in which the second holder locking portion 7c of the torsion waiting spring 7 is locked is connected to the wheel gear side pressing portion 4e of the wheel gear 4 and the rotation. By disposing the second spring locking portion 9d on the rotation trajectory of the output shaft side pressing portion 6d of the moving member 6,
The pressing surface 9f provided on the second spring holder 9 rotates the wheel gear side pressing portion 4e of the wheel gear 4 and the output shaft side pressing portion 6d of the rotating member 6 by the elastic force of the torsion waiting spring 7. Collision part 4 formed at the other end in the direction side
g and 6f are pressed. Therefore, the torsion waiting spring 7 is not directly locked to the wheel gear side pressing portion 4e of the wheel gear 4 and the output shaft side pressing portion 6d of the rotating member 6, and the first and second spring holders 8, 9 The first and second spring locking portions 8d and 9d are arranged on the rotation locus of the wheel gear side pressing portion 4e of the wheel gear 4 and the output shaft side pressing portion 6d of the rotating member 6, respectively. Is locked.

Note that the actuator 1 in this embodiment is
Has been described as an actuator used in a two-wheel drive four-wheel drive drive device, but it can also be used as an actuator for a switch drive device such as a neutral position drive position.

[0059]

As described above, according to the actuator according to the first, second, third, fourth and fifth aspects of the present invention, the first holder locking portion of the torsion waiting spring is locked. In the first spring holder having the first spring locking portion, the first spring locking portion is disposed on the rotation locus of the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the rotating member. Accordingly, the pressing surface provided on the first spring holder has one end on the rotation direction side of the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the turning member respectively due to the elastic force of the torsion waiting spring. Is pressed against the collision portion formed in the first portion. Then, the second spring holder having the second spring locking portion in which the second holder locking portion of the torsion waiting spring is locked,
A pressing surface provided on the second spring holder by arranging the second spring locking portion on the rotation locus of the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the rotating member. Presses a collision portion formed at the other end in the rotation direction of the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the turning member by the elastic force of the torsion waiting spring. Therefore, the torsion waiting spring is not directly locked to the wheel gear side pressing portion of the wheel gear and the output shaft side pressing portion of the rotating member, and the first and second spring locking of the first and second spring holders. Simply by arranging the parts on the rotation trajectory of the wheel gear side pressing part of the wheel gear and the output shaft side pressing part of the rotating member, locking to the torsion waiting spring is performed. Therefore, an excellent effect that the assembling workability is improved is exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of an actuator according to the present invention.

FIG. 2 is an external perspective view for explaining an assembling relationship of main parts of the actuator shown in FIG. 1;

FIG. 3 is an operation explanatory diagram of the actuator shown in FIG. 1;

FIG. 4 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 5 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 6 is an operation explanatory diagram of the actuator shown in FIG. 1;

FIG. 7 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 8 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 9 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 10 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 11 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 12 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 13 is an operation explanatory view of the actuator shown in FIG. 1;

FIG. 14 is an operation explanatory diagram of the actuator shown in FIG. 1;

FIG. 15 is an operation explanatory view of the actuator shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Actuator 2 Motor 2a Armature shaft 3 Worm 4 Wheel gear 4e Wheel gear side pressing part 4f First collision part 4g Second collision part 5 Output shaft 6 Rotating member 6d Output shaft side pressing part 6e Third collision part 6f Fourth collision part 6g1 First case collision part 6g2 Second case collision part 7 Torsion waiting spring 7b First holder locking part 7c Second holder locking part 8 First spring holder 8a First flange 8b 1st cylindrical guide 8d 1st spring locking part 8f (1st pressing surface) pressing surface 9 2nd spring holder 9a 2nd flange 9b 2nd cylindrical guide 9d 2nd spring locking Portion 9f (Second pressing surface) Pressing surface 10 Actuator case 11b (Stroke regulating protrusion) Convex portion 13 Output cam

Claims (5)

[Claims] A motor having an armature shaft that rotates when energized; a worm formed on the armature shaft of the motor; a wheel gear formed with a wheel gear side pressing portion, meshing with the worm, and rotating; An output shaft rotatably supported in the actuator case and rotatably supported in the actuator case; a rotating member coupled to the output shaft and formed with an output shaft side pressing portion; A torsion waiting spring disposed between the moving member and first and second holder locking portions at both ends; a wheel gear side pressing portion of the wheel gear; and an output shaft side pressing portion of the rotating member. A first spring locking portion locked to the first holder locking portion of the torsion waiting spring on a rotation locus of the torsion waiting spring, and rotation of the wheel gear side pressing portion and the output shaft side pressing portion, respectively. A first spring holder disposed between the wheel gear and the torsion waiting spring, the first spring holder having a pressing surface formed at one end on the direction side and capable of contacting a collision portion; Is independently locked on the rotation locus of the wheel gear-side pressing portion of the wheel gear and the output shaft-side pressing portion of the rotating member by the second holder locking portion of the torsion waiting spring. A spring engaging portion, and a pressing surface formed on the other end in the rotation direction of the wheel gear side pressing portion and the output shaft side pressing portion, the pressing surfaces being capable of abutting against a collision portion, and the torsion waiting spring; An actuator, comprising: a second spring holder disposed between the rotating member and an output cam protruding outside the actuator case and coupled to an end of the output shaft. 2. The output shaft side pressing portion of the turning member is formed inside the turning locus of the wheel gear side pressing portion of the wheel gear, and the output shaft side pressing portion is also turned by the turning member and the wheel gear. The actuator according to claim 1, wherein the pressing portion and the wheel gear-side pressing portion are always in a non-contact state. 3. A first spring holder is provided with a first cylindrical guide disposed on an inner peripheral portion of the torsion waiting spring to prevent the torsion waiting spring from falling down, and a second spring holder is provided. Is characterized in that a second cylindrical guide is formed on the inner peripheral portion of the torsion waiting spring in pair with the first cylindrical guide to prevent the torsion waiting spring from falling down. The actuator according to claim 1 or 2, wherein 4. The first spring holder is formed with a first flange for preventing a torsion waiting spring extending outward from an outer periphery of one end surface of the first cylindrical guide, and the second spring holder is provided with: 4. The actuator according to claim 3, wherein a second flange for preventing a torsion waiting spring extending outward from an outer periphery of the one end surface of the second cylindrical guide is formed. 5. A rotating member is provided with first and second case collision portions, and an actuator case is provided with a wheel gear, an output shaft, a rotating member, a first spring holder, a torsion waiting spring, and a second case. A second spring holder is accommodated in the actuator case, and a stroke restricting convex portion for restricting a rotation range of the rotating member by a collision of the first and second case collision portions due to the rotation of the rotating member. Claim 1 characterized by being formed
5. The actuator according to 2, 3, or 4.