JPH0329983Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Industrial Field of Application) This invention relates to an electric actuator for accelerator control used, for example, in an automatic constant speed driving system for automobiles.

(Prior Art) Conventionally, for example, an actuator for accelerator control in an automatic constant speed driving system for automobiles has been used.
The one shown in Figure 5 was found.

That is, the actuator 100 shown in the figure is
A motor 100, a deceleration mechanism 102 connected to the motor 101, and a clutch mechanism 103 are provided in an actuator housing 104, and a cover 10 is provided.
5 closes the end opening of the actuator housing 104.

The motor 101 has a worm gear 106 press-fitted into the armature shaft 101a, and its front end is fixed to the side wall of the actuator housing 104 via a bracket 101b fixed to the motor 101, and its rear end is fixed to the side wall of the actuator housing 104. housing 10
It is fitted into a motor receiving part 104a provided on the side wall of No. 4.

The reduction mechanism 102 includes a large-diameter gear 108a of a wheel sun gear 108 inserted through an intermediate support shaft 107 and a worm gear 106 of the motor 101 in mesh with each other, and rotates together with a small-diameter gear portion 108b of the wheel sun gear 108 and the intermediate support shaft 107. The planet gear 109 is in mesh with the inner gear 11.
0 and is in mesh state.

Further, a small gear 111 is attached to the intermediate support shaft 107, and this small gear 111 and a sector gear 113 fixed to the output shaft 112 are in mesh with each other.

The clutch mechanism 103 includes a disk 114 attached to the lower end of the inner gear 110 described above.
, below this inner gear 110, the intermediate support shaft 1
By energizing an electromagnetic coil 116 having a bearing 115 that supports the lower end of the intermediate support shaft 107, the rotation of the intermediate support shaft 107 is controlled.

Further, the upper end portion of the aforementioned intermediate support shaft 107 is supported by a bearing 116 provided on the cover 105.

A contact plate 117 attached to the back surface of the sector gear 113 is located below the sector gear 113 of the actuator housing 104.
A switch 120 consisting of a contact block 119 having a contact point 118 that comes into contact with and separates from the motor 101 is provided, and this switch 120 controls the output shaft 112 by supplying and cutting off power to the motor 101. The operating angle is regulated.

(Problem to be Solved by the Invention) However, in the conventional electric actuator 100 described above, since the bearing 116 that supports the upper end of the intermediate output shaft 107 is attached to the cover 105, the actuator housing 104, the small diameter gear portion 108b of the wheel sun gear 108 and the planet gear 109, the large diameter gear portion 108a of the wheel sun gear 108 and the worm gear 106, and the small gear 111 and the sector gear 113 are aligned at predetermined meshing positions (predetermined alignment). ) and said bearing 1
16 into the intermediate support shaft 107,
If the intermediate support shaft 107 is supported by the bearing 116 while the gears of the reduction mechanism 102 are not in a predetermined meshing state, there is a problem in that it cannot be said that abnormal noise will not be generated during operation. It was hot.

Furthermore, since the contact plate 117 attached to the back surface of the sector gear 113 comes into contact with and separates from the contact contacts 118 and 118 as the sector gear 113 meshes with the small gear 111 rotates, the small gear 111 is connected to the sector gear 113. On the other hand, when the intermediate support shaft 107 is supported by the bearing 116 without being in the predetermined meshing state, the contact contacts 118, 118 are moved to the contact plate 117.
It becomes difficult to contact and separate from the
If the contact contacts 118, 118 cannot contact and separate from the contact plate 117 at predetermined positions, there is a problem that power cannot be reliably supplied to the motor 101, resulting in malfunction.This problem is solved. This had become an issue.

(Purpose of the invention) Therefore, this invention was made in view of the above-mentioned conventional problems, and by attaching each gear of the reduction mechanism to the actuator housing side with a predetermined alignment amount, it is possible to It is an object of the present invention to provide an electric actuator that does not generate noise and can operate reliably.

[Structure of the invention] (Means for solving the problem) The electric actuator related to this invention has a positive
a motor that rotates in the opposite direction; a speed reduction mechanism supported by an intermediate support shaft connected to an armature shaft of the motor; an output shaft connected to the armature shaft via the speed reduction mechanism; a clutch mechanism that brings the output shaft into a transmission state and a disconnection state;
In an electric actuator in which a switch that turns on and off power supplied to the motor in conjunction with the output shaft is housed in the actuator housing, an output shaft side fitting that fits into an output shaft support portion that covers the outer periphery of the output shaft. and a switch fixing part for fixing the switch, which maintains a predetermined distance between the output shaft and the intermediate support shaft, fixes the gear shaft holding member in the actuator housing, and fixes the gear shaft holding member in the actuator housing. The present invention is characterized in that the holding member is provided with an intermediate support portion for supporting the intermediate support shaft, and is a means for solving the conventional problems with the above-described electric actuator configuration.

(Function of the invention) In the electric actuator according to this invention, the intermediate shaft is supported by the intermediate shaft support part provided on the gear shaft holding member, and the output shaft is supported by the output shaft side fitting part provided on the gear shaft holding member. The output shaft support part that covers the outer circumference is fitted, and the switch is fixed to the switch fixing part provided on the gear shaft holding member. Since it is attached to the actuator housing side while being held in the same position, the alignment amount of each gear of the reduction mechanism is less likely to deviate from a predetermined value, and the switching of the switch is less likely to go awry.

(Embodiment) An actuator according to an embodiment of this invention will be described below with reference to FIGS. 1 to 4.

That is, the actuator 1 includes a motor 3, a reduction mechanism 4, a gear shaft holding member 5, and a clutch mechanism 6 in an actuator housing 2, and the end opening of the actuator housing 2 is closed with a cover 7. There is.

The motor 3 has a worm gear 8 on the armature shaft 3a.
This motor 3 has a bracket 3c fixed to the yoke 3b of the motor 3, and an end bracket 3d fixed to the actuator housing 2.

A wheel sun gear 10 is inserted through the intermediate support shaft 9 provided in the reduction mechanism 4, and the large diameter gear portion 10a of the wheel sun gear and the worm gear 8 of the motor 3 are provided in mesh with each other. The gear portion 10b and a planet gear 11 rotating together with the intermediate output shaft 9 are in mesh with each other, and the planet gear 11 is in mesh with an inner gear 12.

Further, the lower end side of the intermediate support shaft 9 is fixed to a holder 11a that supports the planet gear 11, so that the intermediate support shaft 9 rotates integrally with the holder 11a.

A small gear 1 is attached to the upper end of this intermediate support shaft 9.
3 is attached, and the small gear 13 is a sector gear 1 fixed to an output shaft 15 supported by a bearing 14 fixed to the actuator housing 2.
6, it is in the engaged state.

On the other hand, as shown in FIG. 3, the gear shaft holding member 5 includes an intermediate shaft support portion 5a provided with a bearing 14 that supports the upper end side of the aforementioned intermediate shaft 9, and an intermediate shaft support portion 5a provided in the actuator housing 2. Output shaft 15
The output shaft side fitting part 5b fits into the cylindrical output shaft support part 14a that covers the outer periphery of the bearing 14 that supports the motor control switch 18, and the switch fixing part 5b which fixes the switch terminal 19 forming a part of the motor control switch 18. It is integrally provided with a portion 5c.

Further, a bearing 17 that rotatably supports the intermediate support shaft 9 is attached to the intermediate support shaft support portion 5a at approximately the center position, and there are three places on the outer circumferential side of this bearing 17 for inserting screws 20. A screw hole 5d is provided.

The output shaft side fitting portion 5b that fits onto the output shaft 15 has an inner diameter slightly larger than the outer diameter of the output shaft support portion 14a, and has a state in which it is fitted onto the output shaft support portion 14a. The amount of alignment from the center of the output shaft 15 to the center of the intermediate support shaft 9 is determined to be a predetermined value.

Further, the switch fixing portion 5c is provided with three openings 5f, each having the same shape, into which a switch terminal 19 having a substantially U-shaped cross section can be inserted. The power to the motor 3 is turned on and off by contacting and separating protrusions 18a and 18a provided therein.

On the other hand, the clutch mechanism 6 includes a bearing 20 that supports the lower end side of the intermediate output shaft 9 described above, and a disk 20 attached to the lower end of the inner gear 12.
An electromagnetic coil 22 that electrically attracts 1 is provided.

As a result, the upper end side of the intermediate support shaft 9 is inserted into the intermediate support shaft support 5a of the gear shaft holding member 5, and the output shaft support portion 14a is fitted into the output shaft side fitting portion 5b of the gear shaft holding portion 5. state, insert the screw 20 into the screw hole 5d.
When screwing into the actuator housing 2, the gear holding member 5 is rotated clockwise or counterclockwise in FIG. Adjust the distance to the shaft 15 to the specified alignment amount, and then tighten the screw 2.
0 and fix it.

Then, since the distance from the intermediate support shaft 9 to the output shaft 15 becomes a predetermined value, the protrusion 1 of the sector gear 16
8a, 18a can contact and separate from the switch terminals 19, 19 without any deviation.

Therefore, according to the embodiment described above, even when the cover 7 is removed from the actuator housing 2, it is possible to operate the deceleration mechanism 4, the clutch mechanism 6, and the motor 3.
Fine adjustment between each gear becomes extremely easy.

[Effects of the invention] As explained above, since the electric actuator of this invention has the above-mentioned configuration, the distance between the intermediate support shaft and the output shaft can be maintained at a predetermined size by the gear shaft holding member. Since it is attached to the actuator housing side while being held, the alignment amount of each gear of the reduction mechanism does not deviate from the predetermined value, and the switch is properly switched. This has the excellent effect of reducing operating noise and ensuring reliable operation.

[Brief explanation of drawings]

FIG. 1 is a plan view of an electric actuator in an embodiment of this invention with the cover removed;
2 is a side sectional view of the electric actuator in FIG. 1, FIG. 3 is a plan view of the gear shaft fixing member that constitutes the electric actuator in FIG. 1, and FIG. 4 is an A of the gear shaft fixing member in FIG. 3. -A sectional view and FIG. 5 are side sectional views of a conventional electric actuator. DESCRIPTION OF SYMBOLS 1... Electric actuator, 2... Actuator housing, 3... Motor, 3a... Armature shaft, 4... Reduction mechanism, 5... Gear shaft holding member, 5
a... Intermediate spindle support part, 5b... Output shaft side fitting part, 5c... Switch fixing part, 6... Clutch mechanism, 9... Intermediate spindle, 14a... Output shaft support part,
15...Output shaft, 18...Switch.

Claims (1)

[Claims for Utility Model Registration] A motor that rotates in forward and reverse directions, a speed reduction mechanism supported by an intermediate support shaft connected to the armature shaft of the motor, and a speed reduction mechanism connected to the armature shaft via the speed reduction mechanism. An actuator housing includes an output shaft, a clutch mechanism that transmits or interrupts the power of the motor to the output shaft, and a switch that turns on and off the power supplied to the motor in conjunction with the output shaft. In the electric actuator housed in A gear shaft holding member is fixed in the actuator housing to maintain a predetermined spacing between the shafts, and the gear shaft holding member is provided with an intermediate support shaft supporting portion that supports the intermediate support shaft. Electric actuator.