JP4137741B2 - Lock pin drive structure - Google Patents

Description

  In the present invention, by locking the lock pin, for example, by locking the lock pin to a locked portion of the lid body, or locking the lid body in a closed state, or releasing the lock by inserting the lock pin. The present invention relates to a structure for driving a lock pin.

  As this type of lock pin drive structure, for example, the one described in Patent Document 1 below is known. This lock pin drive structure includes a housing, a lock pin provided so as to be able to appear and retract with respect to the housing, and an electromagnet that linearly drives the lock pin so as to appear and retract with respect to the housing. ing.

  In the lock pin drive structure configured as described above, the fixed iron core is excited by supplying electric power to the electromagnet, and the movable core is drawn to the fixed iron core, thereby causing the lock pin to protrude from the housing. ing. Further, by stopping the supply of electric power to the electromagnet, the movable iron core is moved away from the fixed iron core by the spring force, thereby moving the lock pin so as to be immersed in the casing.

The lock pin driving structure is installed in devices such as an electric washing machine, a clothes dryer, a dishwasher and the like, and the lid provided on these devices is locked in accordance with an electric signal, It is used to avoid the danger of opening the lid.
JP 2002-66189 A

  However, the lock pin drive structure has a problem that noise is loud because excitation sound is generated by an electromagnet and impact sound is generated each time the movable iron core hits the fixed iron core or the like.

  In addition, in the above lock pin drive structure, the lock pin is held in the locked state so that the lock pin can be held and released even when the power is not supplied. It is necessary to have a holding / release mechanism that can be released by being immersed. For this reason, the number of parts is increased, there is a problem in terms of manufacturing cost and reliability, and because of this holding / release mechanism, when the power cannot be energized due to a power failure etc., the lock pin lock state must be released. Had the disadvantage of being difficult.

  The present invention has been made in view of the above circumstances, achieves noise reduction, achieves downsizing and cost reduction, enhances reliability, and further locks the lock pin even when not energized. It is an object of the present invention to provide a lock pin drive structure that can be easily released.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a housing (21), a motor (22) provided in the housing, and a rotation that is installed in the housing and transmitted from the motor. A motion converting means (28) for converting the motion into a linear motion, driven by the motion converting means to move in a linear direction, and locked in a locked portion when moved in a direction protruding from the housing; A lock pin drive structure including a lock pin (25) that releases a locked state with the locked portion when moved in a direction of immersing in a housing, wherein the motion conversion means is transmitted from the motor. The crank plate (23) that is rotationally driven by the rotational force generated, the crank pin (24) provided at the eccentric position of the crank plate, and the top dead center at which the lock pin (25) protrudes from the housing to the maximum extent. in the crank The lock pin support member is provided with an engagement hole (26a) in which a pin abutment surface (26c) is formed at the rear and is coupled to the lock pin. (26) and an elastic elastic member (27) for pressing the lock pin support member forward. A typical example of this elastic expansion / contraction member is a coil spring.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pin contact surface (26c) of the engagement hole (26a) of the lock pin support member (26) is formed in a curved surface shape. It is characterized by being.

  According to a third aspect of the present invention, in the first and second aspects of the present invention, the play in front of the crank pin (24) extends over the entire width of the engagement hole (26a) of the lock pin support member (26). It is characterized by being formed.

  Furthermore, the invention according to claim 4 is the invention according to claims 1 to 3, wherein a clearance (C1) of play ahead of the crank pin (24) is greater than or equal to a stroke (S1) of the lock pin (25). It is characterized by being.

  In the invention according to claims 1 to 4 configured as described above, the preload of the elastic expansion / contraction member always acts on the lock pin, and a forward pressing force is transmitted to the lock pin via the elastic expansion / contraction member. The lock pin appears and disappears in conjunction with the crank pin. In addition, when the lock pin is exposed to the maximum extent, or when it receives an external force in the immersion direction, the external force is absorbed and weakened by the elastic expansion and contraction, and the impact on the crank pin is avoided by play in front of the crank pin. Therefore, damage to the motor provided with the brake mechanism can be prevented. Furthermore, even if it becomes impossible to energize the motor with the lock pin protruding, it is possible to easily release the locked state of the lock pin by applying a force in the immersion direction to the lock pin.

  In the second aspect of the present invention, the lock pin comes and goes according to a moving speed pattern based on a specific curve deviated from the sine curve.

  In the invention according to claim 3, since the play is always maintained in front of the crankpin regardless of where the crankpin is positioned, the lock pin can be used regardless of the position of the crankpin. It is possible to avoid the impact on the crankpin caused by the external force acting on the motor, and to prevent the motor including the brake mechanism from being damaged.

  Furthermore, in the invention described in claim 4, when an external force in the immersing direction is received with the lock pin protruding to the maximum extent, even if the immersive length of the lock pin due to the external force reaches the stroke of the lock pin, Since it is possible to reliably avoid the impact on the pins, it is possible to prevent the motor including the brake mechanism from being damaged.

  According to the first to fourth aspects of the present invention, the pre-load of the elastic expansion / contraction member always acts on the lock pin, and the forward pressing force is transmitted to the lock pin via the elastic expansion / contraction member. Since the lock pin comes and goes, it is possible to reduce noise by preventing generation of excitation sound by an electromagnet or impact sound when the movable iron core hits the fixed iron core or the like. In addition, when the lock pin is exposed to the maximum extent, or when it receives an external force in the immersion direction, the external force is absorbed and weakened by the elastic expansion and contraction, and the impact on the crank pin is avoided by play in front of the crank pin. Therefore, even if the brake torque of the motor provided with the brake mechanism is large, there is no possibility that parts (for example, a speed reducer incorporated in the motor) are damaged. Furthermore, even if the motor cannot be energized with the lock pin protruding, it can easily be released from the locking pin by applying a force in the immersive direction to the lock pin. The locking state of the lock pin can be easily released. In addition, since an expensive holding / releasing mechanism is unnecessary, downsizing and cost reduction can be realized, and reliability can be improved.

  According to the second aspect of the present invention, since the lock pin comes and goes according to the moving speed pattern based on the specific curve deviated from the sine curve, the speed of the lock pin can be arbitrarily adjusted. Can do.

  According to the third aspect of the present invention, a play is always maintained in front of the crankpin regardless of where the crankpin is positioned. The impact on the crank pin caused by the external force acting on the pin can be avoided to prevent the motor including the brake mechanism from being damaged.

  Furthermore, according to the invention described in claim 4, when the lock pin is exposed to an external force in the immersing direction with the protrusion protruding to the maximum, even if the immersive length of the lock pin due to the external force reaches the stroke of the lock pin, Since it is possible to reliably avoid an impact on the crankpin, even if the brake torque of the motor provided with the brake mechanism is large, there is no possibility of damaging components (for example, a speed reducer incorporated in the motor).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a first embodiment of a lock pin drive structure according to the present invention, wherein (a) is a horizontal cross-sectional view showing a state when the lock pin is fully projected, and (b) is a lock pin maximum protruding. (C) is a vertical cross-sectional view showing a state when the lock pin is immersed.

  As shown in FIG. 1, the lock pin driving structure includes a housing 21 formed in a rectangular container shape by a bottom surface portion 21 a and four side surface portions 21 b, and one side surface portion 21 b of the housing 21. A circular guide hole 21c is formed in the. A motor 22 is mounted on the bottom surface portion 21a of the casing 21, and a lock pin 25 is connected to the motor 22 via a motion conversion means 28 so as to be able to appear and retract by a predetermined stroke S1. The motor 22 incorporates a detent torque brake mechanism and a reduction gear.

  The motion converting means 28 includes a crank plate 23, a crank pin 24, a lock pin support member 26, and a coil spring (elastic elastic member) 27. Here, a disc-shaped crank plate 23 is coaxially fitted to the output shaft 22 a of the motor 22, and the crank pin 24 stands upright on the crank plate 23. Further, a block-like lock pin support member 26 is supported above the crank plate 23 so as to be able to advance and retreat in a form that is elastically urged toward the guide hole 21c by a coil spring 27. A rectangular engagement hole 26a is formed in a substantially central portion of the hole 26 so as to penetrate vertically. A pin contact surface 26c is formed in a flat shape at the rear portion of the engagement hole 26a, and the crank pin 24 is in contact with the pin contact surface 26c. Here, in the front of the crank pin 24, a play of a predetermined clearance C1 is formed over the entire width of the engagement hole 26a between the front end of the engagement hole 26a and the pin non-contact surface 26b. C1 is greater than or equal to the stroke S1 of the lock pin 25. Further, a columnar lock pin 25 is integrally connected to the front surface of the lock pin support member 26 in a form slidably supported in the guide hole 21c.

Therefore, in this lock pin drive structure, when the lock pin 25 in the immersed state is protruded to the maximum and is locked to the locked portion (not shown), the motor 22 is energized and the crank plate 23 is rotated halfway. Let Then, the crank pin 24 moves from the bottom dead center to the top dead center along the arcuate path, but the preload of the coil spring 27 always acts on the lock pin support member 26 and eventually the lock pin 25, Since a forward pressing force is transmitted to the lock pin 25 via the coil spring 27, the lock pin 25 moves forward in conjunction with the crank pin 24 while being pressed by the coil spring 27, and FIG. As shown to b), it will protrude from the housing | casing 21 to the maximum and will be in the state latched by the to-be-locked part. At this time, since the lock pin 25 moves forward in accordance with a movement speed pattern based on a sine curve (sine curve), the movement speed of the lock pin 25 is set immediately after the start of advance (near the bottom dead center) and immediately before the end of advance (top dead). Near the point) and at the midpoint between them.

Further, when the lock pin 25 locked to the locked portion is thus immersed and the locked state is released, the motor 22 is energized to further rotate the crank plate 23 half a turn. Then, the crank pin 24 moves from the top dead center to the bottom dead center of the lock pin 25 along the arcuate path. Then, as shown in FIG. 1C, the casing 21 is immersed, and the locked state with respect to the locked portion is released. At this time, since the lock pin 25 moves backward in accordance with a movement speed pattern based on a sine curve (sine curve), the movement speed of the lock pin 25 is set immediately after the reverse start (near the top dead center) and immediately before the reverse end (bottom dead). Near the point) and at the midpoint between them.

  Thus, in this lock pin drive structure, the rotary motion of the motor 22 is converted into a linear reciprocating motion via the motion conversion means 28, and thus the lock pin 25 is driven in a linear direction, so an electromagnet is used. In this case, it is possible to prevent the generation of excitation noise and impact sound when the movable iron core comes into contact with the fixed iron core, and the noise can be reduced. Since the pressing force of the lock pin 25 is determined by the elastic force (spring constant) of the coil spring 27, the elastic force of the coil spring 27 can be changed and set to an arbitrary pressing force.

  Further, no matter where the crank pin 24 is positioned, play is maintained over the entire width of the engagement hole 26a of the lock pin support member 26 in front of the crank pin 24. Even if an external force in the immersion direction is applied unexpectedly, the external force is absorbed by the coil spring 27 and weakened, and an impact on the crank pin 24 is avoided. Moreover, since the clearance C1 in front of the crank pin 24 is equal to or greater than the stroke S1 of the lock pin 25, even if the immersion length of the lock pin 25 due to such an external force reaches the stroke S1 of the lock pin 25, the lock pin 25 It is possible to reliably avoid a situation in which 25 impacts the crankpin 24. Therefore, even if the brake torque (detent torque) of the motor 22 is large, there is no possibility that parts such as a speed reducer incorporated in the motor 22 are damaged.

  Furthermore, when a power failure or the like occurs with the lock pin 25 protruding and the motor 22 cannot be energized, the crank plate 23 cannot be rotated to release the lock pin 25 from being locked. Since play is formed in front of the pin 24, the locked state of the lock pin 25 can be easily released manually by applying a force in the immersion direction directly to the lock pin 25 with, for example, a string.

  In addition, unlike the conventional lock pin drive structure in which the lock pin is driven by an electromagnet, there is no need for a lock pin holding and releasing mechanism, and the number of parts can be reduced accordingly. As a result, the reliability of the lock pin drive structure can be improved.

Here, as shown in FIG. 1 (a), in order to avoid the impact on the crank pin 24 caused by the external force acting on the lock pin 25, the crank pin 24 is positioned wherever the crank pin 24 is positioned. The case has been described in which the engagement hole 26a is formed in a rectangular shape so that play is formed in front of the pin 24 over the entire width of the engagement hole 26a of the lock pin support member 26. However, it is assumed that the external force in the immersive direction is actually applied to the lock pin 25 in most cases when the lock pin 25 protrudes to the maximum extent or is in the immersive state. When it is considered that the countermeasure is sufficient, it is not necessary to form the play in front of the crank pin 24 over the entire width of the engagement hole 26a of the lock pin support member 26. For example, the engagement hole 26a of the lock pin support member 26 is formed as T. It may be formed in a letter shape so that play is formed only in front of the crank pin 24 when the lock pin 25 is positioned at the top dead center or the bottom dead center.

Here, in order to drive the lock pin 25 according to the movement speed pattern based on the sine curve, the pin contact surface 26c of the lock pin support member 26 is formed in a flat shape as shown in FIG. Although the case has been described, it is possible to arbitrarily change the moving speed pattern of the lock pin 25 according to the use of the lock pin drive structure and the like by forming the pin contact surface 26c into various curved surfaces. . For example, as shown in FIG. 2, when the pin contact surface 26c of the lock pin support member 26 is formed in a convex arcuate curved surface, the lock pin 25 appears and disappears according to a moving speed pattern based on a curve slightly deviated from a sine curve. However , the moving speed of the lock pin 25 becomes slow in the vicinity of the top dead center and the bottom dead center. Therefore, when the lock pin 25 is moved to the top dead center or the bottom dead center based on the rotation time or position detection signal of the motor 22, the change in the stop position of the lock pin 25 due to variations in the rotation time of the motor 22 or the position detection signal. Therefore, it is effective for applications that require high-precision positioning of the lock pin 25. Further, as shown in FIG. 3, if the pin contact surface 26c of the lock pin support member 26 is formed in a concave arcuate curved surface, the lock pin 25 appears and disappears according to a moving speed pattern based on a curve slightly deviated from the sine curve. However , the moving speed of the lock pin 25 increases in the vicinity of the top dead center and the bottom dead center. Therefore, the sensitivity at the beginning of the movement of the lock pin 25 becomes sharp, which is effective for applications where the response of the lock pin 25 is required.

It is sectional drawing which shows 1st Embodiment of the lock pin drive structure which concerns on this invention, Comprising: (a) is a horizontal sectional view which shows the state at the time of lock pin maximum protrusion, (b) is the state at the time of lock pin maximum protrusion (C) is a vertical sectional view showing a state when the lock pin is immersed. It is a horizontal sectional view showing a 2nd embodiment of a lock pin drive structure concerning the present invention. It is a horizontal sectional view showing a 3rd embodiment of a lock pin drive structure concerning the present invention.

Explanation of symbols

21 Housing 22 Motor 23 Crank Plate 24 Crank Pin 25 Lock Pin 26 Lock Pin Support Member 26a Engagement Hole 26c Pin Contact Surface 27 Coil Spring (Elastic Elastic Member)
28 Motion conversion means C1 Clearance of play S1 Stroke of lock pin

Claims (4)

A housing (21), a motor (22) provided in the housing, a motion converting means (28) installed in the housing and converting a rotational motion transmitted from the motor into a linear motion; Driven by the motion conversion means to move in a linear direction, engages with the locked portion when moved in the direction protruding from the housing, and moves with the locked portion when moved in the direction of immersing into the housing. A lock pin drive structure comprising a lock pin (25) for releasing the locking state of
The motion conversion means includes a crank plate (23) that is rotationally driven by the rotational force transmitted from the motor, a crank pin (24) provided at an eccentric position of the crank plate, and the lock pin (25). The crank pin is loosely inserted so that play can be formed in front of it at the top dead center protruding from the housing to the maximum, and an engagement hole (26a) having a pin contact surface (26c) formed at the rear portion is provided. A lock pin drive structure comprising: a lock pin support member (26) connected to the lock pin; and an elastic elastic member (27) for pressing the lock pin support member forward. The lock pin drive structure according to claim 1, wherein the pin contact surface (26c) of the engagement hole (26a) of the lock pin support member (26) is formed in a curved surface. 3. The lock pin drive according to claim 1, wherein the play in front of the crank pin (24) is formed over the entire width of the engagement hole (26a) of the lock pin support member (26). Construction. 4. The lock pin according to claim 1, wherein a clearance (C1) of play ahead of the crank pin (24) is equal to or greater than a stroke (S1) of the lock pin (25). Driving structure.

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