JPH071285Y2 - Motor actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a motor actuator used for moving an air mix door or the like in an air conditioner for an automobile, for example.

(Prior Art) Generally, a motor actuator is provided with a motor and a gear device connected to this motor, as disclosed in Japanese Utility Model Laid-Open No. 60-38811, and the driving force from the motor drives the gear device. The output shaft is decelerated, transmitted to the output shaft, and output from the output shaft. Recently, on the outside of such a motor actuator, a plurality of fixed contacts (not shown) are formed facing the movable member 38 and a rotating member 17 having a movable contact 38 as shown in FIG. The movable substrate 38 and the fixed contact constitute a switch mechanism for generating a plurality of switching signals, and the rotating member 17 has a connecting shaft 16 projecting to the side opposite to the output shaft 10. There has been considered a device that is fitted to transmit the driving force from the motor to the rotating member 17. As a result, a control signal for controlling a load (for example, a mode door or an intake door) other than the load controlled by the motor actuator (for example, an air mix door) is simultaneously formed to simplify the control.

(Problems to be solved by the invention) However, in the conventional motor actuator having such a switch mechanism, since the movable contact is biasedly attached to the rotating member, when mechanical vibration is applied, the rotating member is However, there is a drawback in that the loosely fitted to the connecting shaft, the tilting or rotating of the rotating member causes chattering and the like. In particular, in the case where a large play is intentionally formed between the fitting shaft and the rotating member for the purpose of giving the characteristic pattern of the switch mechanism a hysteresis characteristic for preventing hunting, the above-mentioned drawbacks are remarkable. appear.

Further, in this type of motor actuator, once assembled, it is impossible to change the initial setting of the contact position of the movable contact, so that there is a drawback that the versatility is lacking.

Therefore, an object of the present invention is to provide a motor actuator in which the contact position of the movable contact can be easily adjusted even after assembly.

(Means for Solving the Problem) In the motor actuator of the present invention, the gear train 3 connected to the motor 4 is housed in the first case 1 and is attached to the first case 1. The case 21 of FIG. 2 accommodates the rotating member 17 having the movable contacts 38 and 39 and the substrate 30 having the plurality of fixed contacts 28a to 28g, and the movable contacts 38 and 39 and the plurality of fixed contacts. Contact point 28a ~
28g constitutes a switch mechanism for generating switching signals of a plurality of stages, and any gear of the gear train 3 and the rotating member.
In the motor actuator in which 17 and 17 are connected by a connecting shaft 16, the connecting shaft 16 is press-fitted into an insertion hole 19a formed in the center of the rotating member 17, and the rotating member 17 further includes the first The supporting shaft 20 to be inserted into the through hole 23 formed in the second case 21 is provided, and the adjusting engaging portion 40 is formed at the end of the supporting shaft 20.

(Operation) Therefore, the relative position between the connecting shaft 16 and the rotating member 17 can be changed by applying the adjusting tool from the outside to the adjusting member 40 and rotating the rotating member 17.
Therefore, the movable contact position can be changed even after the assembling.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment according to the present invention, in which an actuator has a first case 1 in which an upper case 1a and a lower case 1b are joined together. A gear storage chamber 2 is formed in the gear storage chamber 1, and a gear train 3 is stored in the gear storage chamber 2.

The gear train 3 includes a worm gear 5 fixed to a drive shaft 4a of a drive motor 4 described below, and a worm wheel 6 that meshes with the worm gear 5, and the worm wheel 6 and the output gear 7 have a plurality of intermediate gears. 8 and 9 are meshed with each other, and an output shaft 10 is integrally provided on the output gear 7. The output shaft 10 projects upward from the first case 1 and a connecting member such as a link is attached to the projecting portion. (Not shown) is connected, and an air-mix door (not shown) is rotated via the connecting member.

A drive motor 4 for driving the gear train 3 is housed in a bottomed cylindrical motor case 11, and a bracket 12 is sandwiched between the motor case 11 and the first case 1.
It is screwed to the case 1.

The drive shaft 4a protruding from the bearing portion 4b at the end of the drive motor 4 is inserted into the first case 1 through the insertion hole 13 formed in the side surface of the first case 1. The worm gear 5 is attached to the drive shaft 4a. Therefore, the gear train 3 is driven by the drive motor 4
Is used as a driving source to rotate the output shaft 10 at a predetermined speed.

Power is supplied to the drive motor 4 by a connector (not shown) provided integrally with the lower case 1b, and a substrate 14 connected to this connector and arranged under the gear housing chamber 2
And, it is designed to be performed via a lead wire 15 connected to the substrate 14.

Further, the output gear 7 is integrally provided with a connecting shaft 16, the connecting shaft 16 protruding downward through the substrate 14 and the lower case 1b, and the rotating member 17 is connected to the protruding portion. The rotating member 17 includes a flat plate portion 18 formed in a disc shape, a connecting bearing portion 19 projecting upward from the center of the flat plate portion 18, and a support shaft 20 projecting downward from the center of the flat plate portion 18. Consists of
It is housed in a second case 21 provided so as to cover a part of the lower case 1b, and a spindle is provided in a through hole 23 formed in a boss portion 22 provided inside the second case 21. 20 is rotatably inserted and supported.

The connecting shaft 16 includes a large-diameter portion 16a and a small-diameter portion 16b having a smaller diameter than the large-diameter portion 16a and protruding downward from the large-diameter portion 16a. Engaging piece 16 along
c and 16c are extended downward. On the other hand, in the connecting bearing portion 19 of the rotating member 17, an insertion hole 19a having a diameter slightly larger than that of the small diameter portion 16b is formed, and the engagement piece 16 is provided around the insertion hole
Engagement recesses 19b, 19b are formed that are larger than the widths of c, 16c and that engage with the engagement pieces 16c, 16c in the rotational direction. As a result, the small diameter portion 16b of the connecting shaft 16 is loosely inserted into the connecting bearing portion 19, and a play 24 is formed between the engaging pieces 16c, 16c and the engaging recesses 19b, 19b. Hysteresis is added to the switching characteristic between the blowout mode and the suction mode to prevent hunting.

25 and 26 are switch mechanisms that generate switching signals in multiple stages.
As is known from Japanese Utility Model Laid-Open No. 62-146612, 5 is a movable contact 27 provided on the output gear 7, which is used for controlling the rotation speed of a blower (not shown), for example.
It is composed of a plurality of fixed contacts (not shown) formed on the substrate 14 so as to face the movable contact, so that the rotation speed of the blower can be changed according to the position of the movable contact 27 in contact with the fixed contact. Has become.

On the other hand, 26 is used to control, for example, the blowout mode and the suction mode, and as shown in FIGS. 3 and 4, the fixed contacts 28a to 28g and the movable contact 3 are also provided.
It is composed of 8 and 39. The fixed contacts 28a to 28g are formed, for example, by printed wiring on a substrate 30 that is arranged to face the flat plate portion 18 of the rotating member 17 at a predetermined interval, and has a hole 31 through which the connecting bearing portion 19 is inserted. Concentric circles are provided as the center. Among them, the fixed contact 28a is continuously provided over the entire circumference, is always in contact with the movable contacts 38 and 39, and is connected to the common terminal (com terminal) 32. Further, the other fixed contacts 28b to 28g are separately formed with a predetermined length according to the switching pattern of the suction mode and the blowing mode, and the fixed contacts 28b to 28d are connected to the suction mode terminal 33 and fixed contacts. 28e to 28g are connected to the blowout mode terminal 34, respectively. The substrate 30 on which these fixed contacts are formed is a step portion 35 formed inside the second case 21.
Screwed to each terminal 32, 33, 34 in the second case
It is connected to an external control circuit (not shown) via a lead wire 37 drawn from a notch hole 36 formed in 21.

The movable contacts 38.39 are attached to the rotating member 17 by screws or the like, and are symmetrically attached to the insertion hole 19a, for example, two. That is, each movable contact 3
8,39 are com contacts 38a, 39a and switching contacts 38b, 38 from the flat plate portion 18.
c, 39b, 39c are the same ones that are formed so as to project obliquely, and the contacts are arranged concentrically so that the contacts project in the same direction as the rotation direction and each contact comes close to the flat plate part of the other movable contact. ing. The com contacts 38a, 39a both slide on the fixed contact 28a, and the switching contacts 38b, 38c are fixed contacts 28e-2.
The switching contacts 39b and 39c slide on the fixed contacts 28b to 28d on the 8g. Therefore, the movable contact 3
Depending on the movement of 8, 39, the com terminal 32 and the inhalation mode terminal 33
The conduction state between the discharge mode terminal 34 and the discharge mode terminal 34 is changed, and the suction mode and the discharge mode are controlled in accordance with the conduction state.

In the above configuration, when the motor 4 is energized to drive the motor 4, the driving force is transmitted to the output gear 7 via the worm gear 5, the worm wheel 6, and the intermediate gear 8.
This output gear is rotated. When the output shaft 10 is rotated by the rotation of the output gear 7 and the connecting shaft 16 is also rotated, and the locking pieces 16c, 16c of the connecting shaft 16 come into contact with the engaging recesses 19b, 19b in the rotational direction, from that point of time. The rotating member 17 starts to rotate.
Since the movable contacts 38, 39 provided on the rotating member 17 are provided symmetrically with respect to the insertion hole 19a, the connecting shaft 1
Even if 6 and the rotating member 17 are loosely connected, the rotating member 17 is held horizontally, and the contact position of the movable contacts 38, 39 is changed by the frictional force between the movable contacts 38, 39 and the substrate 30. It is maintained without being displaced even by mechanical vibration.

In FIG. 5, another embodiment of the connecting shaft 16 and the rotating member 17 is shown.

The connecting shaft 16 has a convex portion 16d that fits into a lateral groove formed at the base end of the output shaft 10 at one end, and the other end has an insertion hole 19a for the rotating member 17.
Has been pressed into. Further, unlike the above-described embodiment, the rotating member 17 is provided with the adjustment engaging portion 40 on the support shaft 20.
The adjusting engagement portion 40 is formed, for example, in a hexagonal hole extending in the central axis direction of the support shaft 20. Since the other points are the same as those in the above-mentioned embodiment, the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to this structure, since the movable contact is provided symmetrically and the connecting shaft 16 is press-fitted into the rotating member 17, further rattling is eliminated, and the contact position of the movable contact is reduced. The displacement and the inclination of the rotating member 17 are reliably prevented. Further, according to the above-mentioned embodiment, once the motor actuator is assembled, the contact positions of the movable contacts 38, 39 cannot be adjusted, but by providing the adjustment engaging portion 40 as in this embodiment, The adjustment tool (hexagonal spanner) 41 is applied to the adjustment engaging portion 40, and a force larger than the frictional force between the connecting shaft 16 and the rotating member 17 is applied in the rotation direction to rotate the connecting shaft 16 and the rotating shaft. The contact position can be adjusted by changing the relative position to the member 17.

The shape of the adjustment engaging portion 40 is not limited to the hexagonal hole, and any shape such as a convex portion may be used as long as a force can be applied in the rotating direction of the rotating member 17 by an adjusting tool or a hand.

(Effects of the Invention) As described above, according to the present invention, the support shaft of the rotating member is inserted into the through hole of the case, and the adjustment engagement portion is provided on the support shaft to rotate the support shaft with the fitting shaft. The relative position to the moving member can be changed from the outside, and the initial adjustment of the contact position of the movable contact can be easily performed even after the motor actuator is assembled.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a motor actuator in the first invention, and FIG. 2 is an exploded perspective view of the same,
FIG. 3 is a bottom view showing a substrate provided with fixed contacts,
FIG. 4 is a plan view showing a rotating member provided with a movable contact, FIG. 5 is a partially cutaway sectional view showing an embodiment of a motor actuator in the second invention, and FIG. 6 is a conventional motor actuator. It is an exploded perspective view showing. 1 ... First case, 3 ... Gear train, 4 ... Motor, 16
...... Connecting shaft, 17 ...... Rotating member, 19a …… Insertion hole, 20 ……
Support shaft, 21 …… second case, 23 …… through hole, 28a-28g…
… Fixed contact, 30 …… Board, 38, 39 …… Moving contact, 40 ……
Adjustment engaging part.

Claims (1)

[Scope of utility model registration request] 1. A gear train 3 connected to a motor 4 is housed in a first case 1 and movable contacts 38, 39 are provided in a second case 21 attached to the first case 1. A switch for accommodating a rotating member 17 and a substrate 30 provided with a plurality of fixed contacts 28a to 28g, and generating a plurality of switching signals by the movable contacts 38, 39 and the plurality of fixed contacts 28a to 28g. In a motor actuator that constitutes a mechanism and in which any gear of the gear train 3 and the rotating member 17 are connected by a connecting shaft 16, the connecting shaft 16 is formed at the center of the rotating member 17. Press into the insertion hole 19a,
A support shaft 20 to be inserted into a through hole 23 formed in the second case 21 is further provided at the center of the rotating member 17, and the support shaft 20 is provided.
A motor actuator characterized in that an adjusting engaging portion (40) is formed at an end portion of the.