JPH0573616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an actuator for a constant speed traveling device.

2. Description of the Related Art In recent years, constant speed driving devices have been developed to allow automobiles to travel at a constant speed on expressways and the like. The present invention relates to an actuator in such a constant speed traveling device that receives an input signal from a controller and sends an output to an accelerator linkage mechanism that operates an engine output adjustment device.

[Prior Art] Conventionally, a constant speed traveling device mounted on an automobile has a basic configuration as shown in FIG.

The controller 1 emits control signals to maintain the traveling speed set by the driver, and sends the control signals to the actuator 3 as electrical signals, including control signals for preventing failures and runaways. In many cases, the controller 1 is composed of a computer and its peripheral equipment. The actuator 3 converts the electrical signal into a mechanical signal such as the amount of pull of a control cable. The mechanical signal is transmitted to the accelerator linkage mechanism 4 along with the mechanical signals of other control cables that are pulled based on the depression operation of the accelerator pedal 2. The accelerator linkage mechanism 4 receives input signals from the actuator 3 and the accelerator pedal 2, and issues an output signal to an engine output adjustment device 5 such as a throttle valve or a fuel injection device. The engine output adjustment device 5 is operated by the output signal from the accelerator linkage mechanism 4, and adjusts the throttle amount of the throttle valve, etc., thereby accelerating and decelerating the engine rotation speed, and also has the function of keeping it constant. play.

In a constant speed traveling device having such a basic configuration, during normal constant speed traveling, the actuator 3 controlled by the controller 1 sends a control signal to the accelerator linkage mechanism 4 to operate the engine output adjustment device 5. When a person depresses the accelerator pedal 2 to accelerate the automobile, the accelerator linkage mechanism 4 depresses the accelerator pedal 2.
The engine output adjustment device 5 is operated by giving priority to the output signal from the engine. Further, when the driver stops pressing down on the accelerator pedal 2, the accelerator linkage mechanism 4 is operated again by a control signal from the actuator 3 based on the controller 1.

Since the actuator 3 has the above-mentioned functions, it is required to be able to reliably and quickly convert an input signal into an output signal, and also to be compact so that it does not take up space in the engine room of an automobile. requested.

[Problems to be Solved by the Invention] There are various types of actuators in conventional constant speed traveling devices, but all of them are limited in their overall size by electromagnetic clutch devices, speed reduction mechanisms, etc. As a result, the miniaturization of mechanical parts has lagged behind the advancement of space-saving automobile parts through mechatronics.

In view of these circumstances, the present invention seeks to provide an actuator for a constant speed traveling device that is functionally fully satisfactory and compact.

[Means for solving the problems] The actuator of the constant speed traveling device of the present invention has the following features: (a)
a casing; (b) a cylindrical motor fixed within the casing; and (c) a planet having an engagement recess at the end on the motor side for transmitting rotational driving force from the motor to the output shaft. (d) a cylindrical iron core fixed in a casing so as to surround the motor; and an engagement protrusion capable of engaging with an engagement recess of the reduction gear; A solenoid consisting of a cylindrical electromagnetic coil part that surrounds and is movable in the axial direction, and a solenoid that is arranged coaxially with the electromagnetic coil part and whose end opposite to the reducer is connected to the electromagnetic coil part. (e) an electromagnetic clutch comprising a compression coil spring that is locked and urges the electromagnetic coil portion in the opposite direction of the reducer, that is, in the direction in which the engagement between the engagement recess and the engagement protrusion is released; coupled to the output shaft, and around the outer periphery of which an output wire is wound near the drive end;
and an output pulley to which the drive end is locked;
(f) A return spring for constantly biasing the output pulley in the direction of winding up the wire.

[Operation] When a signal is input from the controller to the electromagnetic coil section (hereinafter simply referred to as the coil section), the coil section is pulled by the iron core and moves in the axial direction against the biasing force of the spring, causing the coil section to move in the axial direction. Since the engaging protrusion and the engaging recess of the speed reducer engage with each other, output can be instantaneously output from the speed reducer. When the motor rotates in this state,
The reduced rotation is transmitted to the output shaft, causing the output pulley to rotate and pulling the wire.

When the coil part is de-energized, the coil part returns to its original position by the action of a compression coil spring (hereinafter simply referred to as a coil spring), and the engagement protrusion of the coil part and the engagement recess of the reducer instantly engage with each other. It comes off.

At that time, even if the motor rotates in the scale, no torque is transmitted to the output pulley. In this case, the return spring always applies appropriate tension to the wire. Furthermore, even if an external force is applied to the output pulley side, the motor side will not rotate due to the action of the reducer when the engaging protrusion of the coil portion and the engaging recess of the reducer are engaged.

Since the motor, core, and coil portion are configured to fit concentrically into each other, the actuator can have a small overall size and a simple external shape with few protruding parts.

[Example] Next, an example of the actuator of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the actuator of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG. 3 is a partially cutaway perspective view of the actuator shown in FIGS. 1 and 2. 4 are block diagrams of a constant speed traveling device using the actuator of the present invention.

As shown in FIG. 4, the actuator 3 of the present invention converts a control signal from the controller 1 into a control cable operation amount and outputs it to the accelerator linkage mechanism 4.

In FIG. 1, reference numeral 11 denotes a casing of the actuator 3, and the casing 11 has an approximately square columnar appearance. The casing 11 includes a main body 15 for accommodating main parts such as a motor 12, an electromagnetic clutch 13, and a speed reducer 14, a lid 17 fitted into an opening 16 on the motor 12 side of the main body 15, and an output casing for accommodating an output pulley 18. It has a configuration in which a portion 19 and several portions such as a lid 21 fitted into an opening 20 of the output portion 19 are combined. The main body 1
5 is further divided into two rooms S1 and S2 by a partition wall 30 having an opening 29 in the center.

The motor 12 is fixed to a fixing member 25 with screws 26 or the like, and as shown in FIG. 3, the flange portion 27 of the fixing member 25 is fixed to the partition wall 30 with bolts 28 or the like, so that the motor 12 is housed in one of the rooms S1. At this time, the output portion 19 may also be fastened together using a long bolt 28.

Next, the electromagnetic clutch 13 housed in the room S1 will be explained.

The fixing member 25 further includes a screw 3 at one end of a cylindrical iron core 31 so as to be concentric with the motor 12.
It is fixed at 2 etc.

A coil portion 34 covered with a cover 33 is arranged concentrically around the outer periphery of the iron core 31.
It is movable in the axial direction using the outer periphery of 1 as a guide. The coil portion 34 is a coil spring 35 housed in a gap between the motor 12 and the iron core 31 so as to surround the motor 12, and is always biased in the direction of arrow A. The end of movement of the coil part 34 in the direction of arrow A is determined by the cover 33 coming into contact with the power distribution part 36 inserted into the opening 16 of the main body 15 of the casing 11, and the end of movement in the opposite direction is determined as shown in FIG. As shown, a stepped portion 38 of the coil portion 34 is attached to the end portion 37 of the iron core 31.
It is determined by the contact between the two.

A pin 4 is inserted from the end of the coil portion 34 on the partition wall 30 side.
There are about 4 pieces of 1 protruding from it. These pins 4
1 corresponds to the engaging protrusion in the claims.
Although the number of pins is not particularly limited, for example, about 2 to 6 pins are usually used. The pin 41 is fitted into a hole 44 of a bushing 43 made of synthetic resin or the like fitted into a hole 42 formed in the fixing member 25,
It is guided by the bush 43 and stops the coil portion 34 from rotating around its own axis.

A disc-shaped clutch plate 46 having an opening 45 in the center and a stationary internal gear 51 of the deceleration mechanism 14, which will be described later, are provided with the partition wall 30 in between. The periphery is fixed to the outer periphery of the boss portion 53 of the stationary internal gear 51 with serrations or the like. Furthermore, the boss portion 53 is rotatably fitted into the opening 29 formed in the partition wall 30. The clutch plate 46 has the pin 4
1 are formed. These engagement holes 47 correspond to the engagement recesses referred to in the claims. Pin 41, coil part 3
4, the iron core 31, the coil spring 35, the clutch plate 46, etc. constitute the electromagnetic clutch 13 as a whole.

Next, the reduction gear 14 will be explained. Since the present invention uses a planetary gear mechanism, the input shaft is always directly connected to the rotating shaft of the motor, and the input to the reducer can be turned on and off by connecting the internal gear and the coil section. Therefore, the overall configuration can be made even more compact.

Although various types of planetary gear mechanism can be used, it is preferable to use the mysterious gear mechanism (Ferguson's gear) shown below because it has a large reduction ratio.

The rotating shaft 50 of the motor 12 is connected through the opening 29 of the partition wall 30 to the reducer 14 housed in the space S2 on the right side of the main body 15 in the drawing.

The reducer 14 includes a small-diameter pinion 54 fixed on the rotating shaft 50 of the motor 12, and a pinion 5.
A planetary gear 56 is meshed with 4 and is itself pivotally supported by carriers 55a and 55b;
It is composed of two internal gears 51 and 52 that mesh with each other. The numbers of teeth of the two internal gears are somewhat different from each other, and the reduction mechanism as a whole constitutes a so-called wonder gear mechanism (Ferguson's gear). The reduction ratio of this is, for example, 1/
It can be around 500.

As described above, the boss portion 53 of one of the internal gears 51 and 52 is coupled to the clutch plate 46 (hereinafter referred to as a stationary internal gear), and A boss portion 57 of 52 (hereinafter referred to as a rotating internal gear) is fixed onto an output shaft 58 by serrations or the like.

The carriers 55a and 55b are composed of two ring-shaped plates, and are slidably arranged on the side surfaces of the stationary internal gear 51 and the rotating internal gear 52, respectively, and as described above, are arranged on the sides of the stationary internal gear 51 and the rotating internal gear 52, respectively. 60 is supported. Note that the shaft 60 may be freely rotatable with respect to the carrier. Carrier 5 on the other hand
The outer periphery of the carrier 55a is slidably supported by the inner periphery of an annular projection 62 formed on the inner surface of the stationary internal gear 51, and the inner periphery of the other carrier 55b is supported by the inner periphery of the boss portion 57 of the rotating internal gear 52. It is slidably supported by the outer periphery.

Next, while referring to Figures 1 and 2, select the output pulley 1.
The configuration around 8 will be explained.

A protrusion 71 is formed on the outer side surface of the rotating internal gear 52, and the protrusion 71 is attached to the casing 11.
Both ends of a torsion coil spring 74 are locked together with a protrusion 73 provided on the partition wall 72 of the output portion 19. The torsion coil spring 74 biases the rotary internal gear 52 and, in turn, the output pulley 18 via the output shaft 58 in the direction of winding the wire 78 around the output pulley 18 (in the direction of arrow C in FIG. 2).

The output shaft 58 is rotatably supported by a boss portion 79 formed on the partition wall 72 of the output portion 19, and is further supported by a bearing portion of the lid 21 together with a boss portion 80 of the output pulley 18 fixed to the outer periphery of the output shaft 58. 81
It is also supported by.

A groove 82 for engaging the wire 78 and a locking portion 84 for locking a locking piece 83 fixed to the end of the wire 78 are provided on the outer periphery of the output pulley 18, respectively.

Micro switches 86 and 87 for limiting the rotation angle of the output pulley 18 are provided between the lid 21 that closes one end of the output portion 19 of the casing 11 and the output pulley 18. The lead wires of the microswitches 86 and 87 are led toward the power distribution section 36 through, for example, the vicinity of the inner corner of the rectangular cylindrical casing 11.

Next, the operation of the actuator constructed as described above will be explained.

When the coil section 34 is not energized by a command from the controller 1, the coil section 34 moves in the direction of arrow A by the biasing force of the coil spring 35, and the engagement between the pin 41 and the clutch plate 46 is disengaged.
Therefore, in that state, the stationary internal gear 51 is free to rotate.

When the coil section 34 is energized by the command from the controller 1, the coil section 34 and the iron core 31
Attract each other. At this time, since the iron core 31 is fixed to the casing 11 by the fixing member 25, the coil portion 34 moves in the direction of arrow B, and the pin 41 and the engagement hole 47 of the clutch plate 46 engage with each other. In this state, the stationary internal gear 51 cannot rotate, so when the motor 12 rotates in response to a command from the controller 1, the rotation reduced by the reducer 14 is transmitted to the output shaft 58. As a result, the output pulley 18 rotates in the direction of arrow C, and the wire 78 is wound onto the output pulley 18.

The pulling operation of the wire 78 at that time is transmitted to the accelerator linkage mechanism 4 shown in FIG. 3, and if there is no operation from the clutch pedal 2, the pulling operation of the wire is transmitted to the engine output adjustment device 5, for example. A vehicle such as a car is driven at a constant speed. Note that when the driver operates the accelerator pedal 2 while driving at a constant speed, the accelerator linkage mechanism 4 functions to give priority to the operating force from the accelerator pedal 2, and when the accelerator pedal 2 is released, the accelerator linkage mechanism 4 functions to give priority to the operating force from the accelerator pedal 2. The engine output adjustment device 5 is operated based on the operation.

In the above operation, when the tension applied to the wire 78 is loosened, the rotating internal gear 52 and the output pulley 18 rotate in the direction of arrow C due to the biasing force of the torsion coil spring 74 when the stationary internal gear 51 is free. , the wire 78 can be wound onto the output pulley to take up any slack in the wire. That is, the torsion coil spring 74 acts as a return spring.

Conversely, when the stationary internal gear 51 is stopped by the electromagnetic clutch 13, the reduction ratio of the reducer 14 is extremely large (usually about 1/500), so even if the wire 78 is pulled by an external force, the rotating internal gear gear 52
does not rotate. Thereby, the angular position of the output pulley 18 can be fixed at a predetermined set position.

In the actuator of the present invention, the annular projection 62 formed on the output portion 19 of the casing 11 is fitted into the circular opening formed on the main body 15, so that the output portion 19 can freely rotate around the central axis of the output shaft 58. When configured in such a manner, it becomes easy to apply rotational biasing force to the torsion coil spring 74 in advance. That is, in order to give initial deflection to the torsion coil spring 74, both ends of the torsion coil spring are engaged with the protrusions 71 and 72, respectively, and the output part 19 is fitted to the main body 15, and then the output part is rotated at a desired angle or number of times. Then, in this state, the output portion 19 may be fixed to the main body 15 with a bolt 28 or the like.

[Effects of the Invention] In the actuator of the constant speed traveling mechanism of the present invention, the electromagnetic clutch mechanism is configured in a cylindrical shape capable of housing a motor therein, so that the overall shape is extremely simple without any protrusions. It's getting old.
Furthermore, since a planetary gear mechanism is employed as the reduction mechanism, the overall size is reduced, and the installation space in an automobile or the like is extremely small.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the actuator of the present invention, FIG. 2 is a sectional view taken along the line X-X in FIG. 1, and FIG. 3 is a partially cutaway perspective view of the actuator shown in FIGS. 1 and 2. 4 are block diagrams of a constant speed traveling device using the actuator of the present invention. Main symbols in the drawing, 3...actuator, 11
... Casing, 12 ... Motor, 13 ... Electromagnetic clutch, 14 ... Reducer, 18 ... Output pulley, 31 ... Iron core, 34 ... Coil part, 35 ...
Coil spring, 41...pin, 46...clutch plate, 47...engaging hole, 58...output shaft, 74...
Torsion coil spring, 78...wire.

Claims (1)

[Claims] 1. An actuator for operating a wire whose driven end is connected to an accelerator linkage mechanism, the actuator comprising: (a) a casing; and (b) a cylindrical motor fixed within the casing. (c) a reduction gear consisting of a planetary gear mechanism for transmitting the rotational driving force from the motor to the output shaft and having an engagement recess at the end on the motor side; (d) a reduction gear that surrounds the motor; A cylindrical electromagnetic coil portion that includes a cylindrical iron core fixed in a casing and an engagement protrusion that can be engaged with an engagement recess of the speed reducer, and that surrounds the iron core and is movable in the axial direction. a solenoid which is disposed coaxially with the electromagnetic coil part, and whose end opposite to the reduction gear is locked to the electromagnetic coil part, and the electromagnetic coil part is moved in the opposite direction of the reduction gear, that is, the engagement part. (e) an electromagnetic clutch consisting of a compression coil spring for biasing the engagement recess and the engagement protrusion in a direction in which the engagement is released; The area near the drive end is wrapped,
An actuator for a constant speed traveling device comprising: an output pulley to which the drive end is locked; and (f) a return spring for constantly biasing the output pulley in a direction to wind up a wire. 2. The planetary gear mechanism includes a pinion provided on the rotating shaft of the motor, a planetary gear that meshes with the pinion and is pivotally supported by a carrier provided rotatably around the rotation center of the motor; a stationary internal gear that meshes with the planetary gear and is formed with the engagement recess capable of engaging with the engagement protrusion of the coil portion; and a stationary internal gear that meshes with the planetary gear and is somewhat different from the stationary internal gear. The actuator according to claim 1, comprising a rotating internal gear having a number of teeth and coupled to the output shaft.