JPH0742557U - Actuator - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an actuator that can attach a thermistor extremely easily and reliably. [Structure] Thermistor mounting part 6b of terminal holder 6
An actuator 1 having thermistor locking portions 6d and 6e formed with locking projections for holding the thermistor 10 inserted in the above so as not to fall off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is an actuator used to stop or start a diesel engine by closing or opening a fuel cut valve built into a diesel engine injection pump by power supply. Regarding data

[0002]

[Prior art]

 Japanese Patent Publication No. 54-43128 discloses an actuator for stopping or starting a diesel engine by closing or opening a fuel cut valve built in an injection pump of a diesel engine by power supply. The ones described are known. In the actuator described in the above publication, when electric power is supplied to the motor housed in the actuator case and the motor generates rotational power, the rotational power of this motor causes the worm wheel to rotate and is connected to this worm wheel. It is known that a slider reciprocates. Power is supplied to the motor when the ignition switch is operated to the start side and when the ignition switch is operated to the stop side, so the fuel supply valve is closed or opened by the movement of the slider. Power is supplied to the motor from the external wiring through the terminal and a positive temperature coefficient thermistor (PTC thermistor) for preventing burnout. This thermistor is fixed to the case by soldering the lead wires to the terminal respectively. It was

[0003]

[Problems to be solved by the device]

 In the conventional actuator described above, the thermistor is fixed to the case by soldering the lead wires to the terminals, respectively, so the workability of mounting the thermistor is poor and the electrical connection between the thermistor lead wires and the terminal is secure. If it is not done, there is a problem that power supply to the motor may be hindered, and it has been a problem to solve this problem.

[0004]

[The purpose of the device]

 The actuator according to the present invention is intended to provide an actuator that can attach a thermistor very easily and reliably.

[0005]

[Constitution of device]

[0006]

[Means for Solving the Problems]

 An actuator according to the present invention is connected to an actuator case, a motor that is housed in an actuator case, generates rotational power by power supply, a worm wheel that rotates in the actuator case by the rotational power of the motor, and a worm wheel, and is connected to the worm wheel. A slider that is reciprocated by the rotational power of the wheel, a thermistor that is formed in a disk shape and has external connection parts on both sides, and an external connection terminal for external wiring connection that is connected to one external connection part of the thermistor. Is an actuator that is connected to the other external connection part of the thermistor and has a motor connection terminal for connecting a motor.The actuator case is made of elastic resin and has a thermistor mounting part in the center. Install the terminal holder that has Is located between the first terminal mounting part with the external connection terminal and the first terminal mounting part facing each other. The motor connection terminal is positioned between the external connection terminal and the thermistor external connection part. A second terminal mounting part with a width dimension slightly smaller than that of the thermistor inserted into the thermistor mounting part at the upper part of at least one of the first terminal mounting part and the second terminal mounting part. It has a height dimension slightly larger than the height dimension and is equipped with a thermistor locking part that has a locking projection protruding inside the thermistor mounting part. In the embodiment used, at least one of the external connection terminal and the motor connection terminal is installed in the thermistor mounting part. Only to have and this forming the pressing protrusion that protrudes in an arc shape.

[0007]

[Function of the device]

 In the actuator according to the present invention, when the thermistor is inserted into the thermistor mounting part of the terminal holder, one external connection part of the thermistor is connected to the external connection terminal at the first terminal mounting part and the other external connection part of the thermistor. Is connected to the motor connecting terminal at the second terminal mounting portion, and in this state, the thermistor is held in the thermistor mounting portion by the locking projection of the thermistor locking portion. Therefore, when mounting the thermistor, the electric connection is surely made without using any connecting means such as soldering, and the thermistor does not easily come off.

[0008]

【Example】

 1 to 5 show an embodiment of an actuator according to the present invention, FIG. 1 is a plan view of a state in which a case cover of the actuator is removed, FIG. 2 is a vertical side view of FIG. 4 is a plan view around the terminal holder, FIG. 4 is a side view of FIG. 3, and FIG. 5 is an external perspective view showing an assembling relationship of the thermistor to the terminal holder.

The illustrated actuator 1 is mainly composed of a motor 3, a worm wheel 4, a slider 5, a terminal holder 6, an external connection terminal 7, a motor connection terminal 8 and an external connection housed in an actuator case 2. It is also composed of a terminal 9 for dual-purpose motor connection and a thermistor 10 for preventing burnout. An opening portion of the actuator case 2 is covered with a case cover 2a.

A worm 3c is formed on a portion of the motor shaft 3a provided on the motor 3 so as to project from the motor case 3b. An armature (not shown) is housed in the motor case 3b of the motor 3, and a brush (not shown) for supplying a current to the armature coil of the armature is provided on the outside of the motor case 3b. Is connected to the motor connection terminal 8 and the external connection / motor connection terminal 9 respectively, the current is supplied to the brush from the motor connection terminal 8 / external connection / motor connection terminal 9 through the motor terminals 3d and 3e. As a result, the armature rotates and the motor shaft 3a also rotates. A worm wheel 4 meshes with the worm 3c of the motor shaft 3a.

The worm wheel 4 is rotatably supported by the actuator case 2. A shaft-shaped wheel pin 4a is provided on the worm wheel 4, and the wheel pin 4a is rotatably connected to one end of the link 11 and the other end of the link 11 is inside the actuator case 2. It is rotatably connected to a slider pin 5a provided as a shaft near one end of a slider 5 mounted so as to be linearly movable. Since one end of the return spring 12 is locked to the wheel pin 4a and the other end of the return spring 12 is locked to the slider pin 5a, the slider 5 is returned to the output side every half rotation of the worm wheel 4. It is forcibly moved to the side with the elastic repulsion force of the return spring 12. An output cable 13 is connected near the other end of the slider 5, and the output cable 13 is connected to a fuel cut valve in an injection pump (not shown). Therefore, half-rotation of the worm wheel 4 causes the slider 5 to move. When it moves to the output side, the fuel cut valve is opened to allow the fuel supply, and when the slider 5 moves to the return side, the fuel cut valve is closed to prevent the fuel supply.

On the other hand, the motor connection terminal 8 and the external connection / motor connection terminal 9 are attached to the terminal holder 6 together with the external connection terminal 7.

The terminal holder 6 is made of a resin having elasticity and is arranged below the actuator case 2. The terminal holder 6 has a groove-shaped thermistor mounting portion 6b provided inside the actuator case 2, which is one side of the main body 6a having a rectangular shape, and the other side of the main body 6a is an actuator. A connector connecting portion 6c for connecting a connector (not shown) to the outside of the case 2 is provided.

The width dimension of the opening portion of the thermistor mounting portion 6b is larger than the thickness dimension between the external connection portions 10a and 10b of the thermistor 10 which will be described later, and the depth dimension of the opening portion of the thermistor mounting portion 6b is the thermistor 10 described above. On both sides of the thermistor mounting part 6b of the terminal holder 6, there are provided thermistor locking parts 6d and 6e, which are formed to have a height dimension larger than the depth dimension of the thermistor mounting part 6b, at symmetrical positions. Locking projections 6d1 and 6e1 are formed at the upper ends of the thermistor locking portions 6d and 6e, respectively, and projecting like wedges into the thermistor mounting portion 6b.

The distance between the thermistor locking portions 6d and 6e is slightly smaller than the outer diameter of the thermistor 10. Since the terminal holder 6 is formed of a resin having elasticity, the thermistor locking portions 6d and 6e are elastically deformed when the thermistor 10 is inserted into the thermistor mounting portion 6b, and the thermistor mounting portion 6 of the thermistor 10 is deformed. Since the thermistor 10 is inserted into the thermistor mounting portion 6b and the locking projections 6d1 and 6e1 are locked to the upper side of the thermistor 10, the thermistor 10 is inserted into the thermistor mounting portion 6b. It has a function to prevent it from falling out.

A first terminal mounting portion 6f formed in a wall shape is formed between the thermistor mounting portion 6b of the terminal holder 6 and the connector connecting portion 6c and is connected to the locking pieces 6d and 6e. The external connection terminal 7 is attached by being fitted to the first terminal attachment portion 6f.

A second terminal mounting portion 6g is formed on the terminal holder 6 at a position facing the first terminal mounting portion 6f via the thermistor mounting portion 6b, and the second terminal mounting portion 6g is formed. The motor connecting terminal 8 is attached by being fitted to 6g.

The external connection terminal 7 is formed of a metal that is electrically conductive and has a slight elasticity, and a fixing portion 7a having a "U" -shaped cross section is provided substantially in the center. In addition, a rectangular base 7b is provided along the first terminal mounting portion 6f on the inside of the actuator case 2, which is one side of the fixing portion 7a, and at three locations on the base 7b. Is formed with pressing projections 7c, 7d, and 7e that protrude in an arc shape toward the inside of the thermistor mounting portion 6b. The external connection terminal 7 is connected to an external wiring (not shown) on the external side of the actuator case 2, which is the other side of the fixing portion 7a.

Like the external connection terminal 7, the motor connection terminal 8 is made of a metal that is electrically conductive and has a slight elasticity, and has a substantially U-shaped cross section for fixing in the center thereof. A part 8a is provided, and a rectangular base 8b extending from the fixing part 8a into the thermistor mounting part 6b is provided along the second terminal mounting part 6g. At two positions on the base 8b, the pressing projections 7c, 7d, and 7e of the external connection terminal 7 are asymmetrical with the pressing projections 8c and 8d protruding inward into the thermistor mounting portion 6b. Are formed respectively.

The motor connection terminal 8 extends from the fixing portion 8 a to the vicinity of the motor 3 and is connected to one motor terminal 3 d of the motor 3.

The external connection / motor connection terminal 9 is formed of a metal that is electrically conductive and has a slight elasticity like the motor connection terminal 8 and the external connection terminal 7. The terminal 9 for external connection and motor connection has a fixing portion 9a provided substantially at the center attached to the actuator case 2, and the inside of the actuator 2 which is one side of the fixing portion 9a is a motor. 3 and is connected to the other motor terminal 3e of the motor 3 and the outside of the actuator case 2, which is the other side of the fixing portion 9a, is connected to an external wiring (not shown).

On the other hand, the thermistor 10 has a positive characteristic (PTC thermistor), and has external connecting portions 10b and 10c on both surfaces of a disk-shaped main body 10a. The thermistor 10 is mounted in the thermistor mounting portion 6b of the terminal holder 6.

Here, the pressing protrusions 7c, 7d, 7e formed on the base 7b of the external connection terminal 7 are provided on the side of the first terminal mounting portion 6f in the thermistor mounting portion 6b provided in the terminal holder 6. Projecting toward the inside of the thermistor mounting portion 6b, and on the side of the second terminal mounting portion 6g in the thermistor mounting portion 6b, a holding protrusion 8c formed on the base 8b of the motor connection terminal 8 is provided. , 8d are projected toward the inside of the thermistor mounting portion 6b, the pressing protrusions 7c, 7d, 7e of the external connection terminal 7 and the pressing protrusions 8c, 8d of the motor connection terminal 8 are spaced apart from each other by the thermistor 10. The width is smaller than the width between the external connection parts 10b and 10c, and by inserting the thermistor 10 there, the external connection terminal By pressing one of the external connection parts 10b of the thermistor 10 with the pressing projections 7b, 7c, 7d of 7, and pressing the other external connection part 10c of the thermistor 10 with the pressing projections 8c, 8d of the motor connecting terminal 8. The thermistor 10 is held immovably from both sides.

When mounting the thermistor 10 in the actuator 1 having such a structure, the terminal holder 6 to which the external connection terminal 7, the motor connection terminal 8 and the external connection / motor connection terminal 9 are attached is attached. When the thermistor 10 is inserted into the thermistor mounting portion 6b from the upper side in FIG. 4, the thermistor locking portions 6d and 6e are elastically deformed to allow the thermistor 10 to be inserted into the thermistor mounting portion 6b. By locking the locking projections 6d1 and 6e1 on the upper side of the thermistor 10, the thermistor 10 is inserted into the thermistor mounting portion 6b by insertion from one side. At the same time, the pressing projections 7c, 7d, 7e of the external connection terminal 7 are elastically deformed to press one external connection portion 10b of the thermistor 10 so that the external connection terminal 7 receives one external connection portion 10b of the thermistor 10. Is connected, and the pressing projections 8c and 8d of the motor connecting terminal 8 are elastically deformed to press the other external connecting portion 10c of the thermistor 10 to connect the motor connecting terminal 8 to the other external connecting of the thermistor 10. Since the portion 10c is connected, the thermistor 10 is immovably pressed from both sides, and the thermistor 10 is held by the terminal holder 6 in the thermistor mounting portion 6b so that the thermistor 10 cannot slip off and move.

In this state, after the case cover 2a is attached to the actuator case 2 with screws (not shown) and the assembling is completed, the external connection terminal 7, the motor connection terminal 8, the one motor terminal 3d of the motor 3, the motor When the motor terminal 3e on the other side of 3 and the terminal 9 for external connection and motor connection are energized, the motor shaft 3a rotates forward to rotate the worm wheel 4 half a turn, and the slider 5 outputs via the link 11. The fuel cut valve connected to the output cable 13 is opened to open the fuel cut valve to allow the fuel supply.

When electricity is applied to the external connection / motor connection terminal 9, the other motor terminal 3e of the motor 3, one motor terminal 3d of the motor 3, the motor connection terminal 8 and the external connection terminal 7. When the motor shaft 3a rotates in the reverse direction, the worm wheel 4 further rotates half way, and the slider 5 moves to the return side via the link 11 to close the fuel cut valve connected to the output cable 13. Will be blocked.

[0027]

[Effect of device]

 As described above, since the actuator according to the present invention has the above-mentioned configuration, when the thermistor is mounted, the electric connection is surely made without using any connecting means such as soldering, and moreover, it does not fall out. Since it can be carried out without any need, it has an excellent effect that the thermistor can be mounted extremely easily and surely.

[Brief description of drawings]

FIG. 1 is a plan view of an actuator according to the present invention with a case cover removed.

FIG. 2 is a vertical sectional side view of the actuator shown in FIG.

FIG. 3 is a plan view around a terminal holder in the actuator shown in FIG.

FIG. 4 is a plan view of the terminal holder shown in FIG.

5 is an external perspective view showing an assembling relationship of the thermistor to the terminal holder in the actuator shown in FIG.

[Explanation of symbols]

 1 actuator 2 actuator case 3 motor 4 worm wheel 5 slider 6 terminal holder 6b thermistor mounting part 6d, 6e thermistor locking part 6d1, 6e1 locking protrusion 6f first terminal mounting part 6g second terminal mounting part 7 for external connection Terminal 8 Terminal for motor connection 10 Thermistor 10b, 10c External connection part

Claims (2)

[Scope of utility model registration request] 1. An actuator case, a motor that is housed in the actuator case and generates rotational power by power supply, a worm wheel that rotates in the actuator case by rotational power of the motor, and a worm wheel connected to the worm wheel. A slider that is reciprocally moved by the rotational power of the worm wheel, a thermistor that is formed in a disk shape and has external connection parts on both sides, and is connected to one external connection part of the thermistor for external connection for external wiring connection. A terminal, an actuator having a motor connection terminal for connecting a motor, which is connected to the other external connection portion of the thermistor, and is made of a resin having elasticity in an actuator case,
A terminal holder having a thermistor mounting portion is provided in the center, and the terminal holder is provided with a first terminal mounting portion to which the external connection terminal is mounted, and a first terminal mounting portion facing the first terminal mounting portion. A second terminal mounting portion in which the terminal for mounting is mounted with a width dimension slightly smaller than the dimension between the external connecting portions of the thermistor with respect to the external connecting terminal, the first terminal mounting portion and the second terminal mounting portion. The thermistor engaging part having an engaging projection protruding into the thermistor attaching part with a height dimension slightly larger than that of the thermistor inserted in the thermistor attaching part at least on the upper part of the terminal attaching part An actuator characterized by being equipped with. 2. A pressing protrusion protruding in an arc shape toward the thermistor mounting portion is formed on at least one of the external connection terminal and the motor connection terminal.
Actuator described in.