JP2005307556A - Driving force transmitting mechanism of motor-driven electric lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure the operation by simplifying a driving force transmitting mechanism of a motor-driven electric lock. <P>SOLUTION: This driving force transmitting mechanism includes a driving gear 8 and a driven gear 9 respectively rotatably supported on a base shaft 7, wherein the driving and driven gears 8, 9 are rotated independently of each other, the driven gear 9 is guided to move along the axis of rotation, the driven gear 9 is energized to approach the driven gear 8 by an energizing spring 13, an engagement projecting part 16 having an inclined part is formed on one of opposite surfaces of the driving gear 8 and the driven gear 9, and the other surface opposite to the engagement projecting part is provided with an engagement recessed part 18 formed to engage with the above and have the same shape as above. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a driving force transmission mechanism (hereinafter simply referred to as a transmission mechanism) of a motor-driven electric lock, and more particularly to a transmission mechanism that employs a pure mechanical clutch mechanism that is simple in structure and reliable in operation.

  Many high-grade electric locks are so-called motor-driven types that transmit the rotational force of the micromotor directly to the dead bolt control mechanism via the reduction gear train.

  In this case, as shown in FIG. 1, a dead bolt control mechanism such as a so-called dead cam 4 that engages with the dead bolt 1 and directly inserts and removes it from the front plate 3 of the lock box 2 is illustrated via a reduction gear train 5. In addition to being connected to a micromotor that is not connected, it is also connected to an indoor thumb turn or cylinder lock in case of an accident such as a power failure.

  When a power failure occurs due to a fire or earthquake, the dead cam 4 is pivotally controlled from the outdoor side via a cylinder lock with a key to use a thumb turn coaxially connected to the dead cam 4 from the indoor side. Thus, the electric lock is switched to an ordinary cylinder lock, and the door is locked and unlocked.

  By the way, if the dead bolt control mechanism is always connected to both the micro motor and the cylinder lock, one of them becomes the other brake and the electric lock does not move.

  Therefore, a normal motor-driven electric lock is provided with a clutch mechanism coaxially with, for example, the final drive gear 6 shown in FIG. 1, and when the micromotor and the dead bolt control mechanism are connected, the latter and the cylinder lock are disconnected, and the cylinder lock and the dead bolt are separated. When connecting the control mechanism, the latter and the micro motor are separated.

  A conventional clutch mechanism has, for example, a built-in electromagnetic clutch and switches the connection by operating this electromagnetic clutch, or like an electric lock described in, for example, Japanese Utility Model Publication Nos. 3-17012 and 3-51497. In addition, a general bus top mechanism is adopted, and when the dead bolt is driven by the micro motor, the dead bolt control mechanism and the micro motor are automatically and mechanically separated.

  However, both methods are complicated and expensive, and have become a bottleneck for the spread of such motor-driven electric locks.

Therefore, the present applicant has previously proposed a transmission mechanism using a novel mechanical clutch mechanism with the following Patent Documents 1 to 3.
Japanese Patent No. 3500316 JP 2003-232150 A JP 2003-232387 A

  Of course, the transmission mechanism according to the above-mentioned proposal of the present applicant has been put into practical use by exhibiting the intended function. However, the transmission mechanism uses a kind of one-way clutch using a roller or a ball, and the structure is slightly different. There is still room for improvement, such as complexity and the fact that there is a member that rotates while rubbing against the drive shaft.

  Accordingly, an object of the present invention is to propose a novel transmission mechanism that has a simple structure and good transmission efficiency, and that can reliably switch the driving force.

  In order to achieve the above object, the invention described in claim 1 has a drive gear and a driven gear that are rotatably supported on a base shaft, respectively, and these drive and driven gears can be rotated independently of each other. And the driven gear is guided so as to move along the rotation axis, and the driven gear is urged in the direction close to the drive gear, and one of the mutually facing surfaces of the drive gear and the driven gear An engaging protrusion having an inclined portion is formed on the other surface facing the engaging protrusion, and an engaging recess having the same shape as the engaging protrusion is formed on the other surface, and the drive gear is connected to the micromotor via the reduction gear train. The driven gear is connected to the dead cam.

  When the invention according to claim 1 configured as described above operates as a motor-driven electric lock, the driving and driven gears are integrated with each other by engagement with the engaging protrusion and the engaging recess that are fitted to each other. The dead cam is driven by the micromotor via the drive and driven gears and the reduction gear train. On the other hand, when the dead cam is rotated with respect to the fixed drive gear, when the dead cam is turned, Due to the wedge action that occurs between the inclined edge of the engagement recess and the inclined edge of the engaging recess, the driven gear moves in a direction away from the drive gear, the gears slip, and the dead cam becomes free, and unlocking and unlocking operation by key lock or thumb turn Is possible.

  A fan-shaped engagement protrusion is formed on one of the mutually opposing surfaces of the drive and driven gears, and an engagement recess is formed on the other, and the driven gear is guided so as to be separated from the drive gear. In addition, the simple mechanism of energizing in the direction close to the drive gear constitutes a driving force transmission mechanism for a motor-driven electric lock that is reliable and rational without using a complicated and expensive clutch mechanism. I was able to.

Embodiments of the present invention will be described below with reference to FIGS.
2 and 3, reference numeral 7 denotes a base shaft, and the base shaft 7 is provided so as to straddle between the two side plates 2, 2 of the lock box and perpendicular thereto.

  The base shaft 7 is supported and guided so that the drive gear 8 and the driven gear 9 can be rotated independently of each other, and the driven gear 9 can be moved along the rotation axis.

  In the illustrated embodiment, a spring that urges the driven gear 9 in the direction of the drive gear 8 is elastically mounted as will be described later, so that the drive gear 8 is not directly fitted to the base shaft 7 and the oblong flange is formed at the lower end. (See FIG. 4 and FIG. 5) is indirectly supported on the base shaft 7 via the spring cylinder 11.

  Therefore, as shown in FIGS. 3 to 5, an oval connecting hole 12 is continuously provided in a hole fitted to the support shaft on the lower surface of the drive gear 8 in FIG. The drive gear 8 is supported on the base shaft 7 with the 11 flanges engaged.

  As shown in FIG. 3, a thick driven gear 9 is supported on the outside of the spring cylinder 11 so as to be rotatable and movable along the length direction of the spring cylinder 11.

  Further, an urging spring 13 as a compression coil spring is elastically mounted in an unnumbered recess formed in the center of the upper surface of the driven gear 9 and on the upper portion of the spring cylinder 11. The position is regulated by the washer 14 and the retaining ring 15.

  On the other hand, as shown in FIG. 6, on the lower surface of the driven gear 9 in FIG. 3, a pair of engagement projections 16 and 16 having a fan-shaped projection on the side surface of the lock box are formed coaxially with respect to the central axis O of the support shaft. Has been.

  In the illustrated embodiment, hatching is given to clearly show the engaging protrusion, but it is not actually hatched. The same applies to an engagement recess described later.

  Here, the fan-shaped engagement protrusion 16 is formed coaxially with respect to the center axis O of the support shaft in the sense that the arc portion of the engagement protrusion 16 forms an arc centered on the center axis O. is there.

  Inclined edges 17 are formed on at least both side ends of the engaging protrusion 16. Here, at least both side ends mean that the arc-shaped portion of the sector-shaped engagement protrusion 16 may be formed, but in the illustrated embodiment, an inclined edge is formed in the arc-shaped portion. It has not been.

  The inclination of the inclined edge is preferably 45 degrees, for example. Here, the inclination of 45 degrees is a horizontal line where the line extending from the upper left to the lower right shows the engagement protrusion when the lowermost inclination edge shown in FIG. This means that the angle intersecting the line segment is 135 degrees.

  On the other hand, as shown in FIG. 4, a pair of engaging recesses 18 and 18 are formed symmetrically and coaxially with respect to the central axis O of the support shaft on the upper surface of the drive gear 8 in FIG.

  Inclined edges 17 are formed on at least both side ends of each engaging recess 18. In the illustrated embodiment, inclined edges that are not numbered are also formed on the outer peripheral portion of each engaging recess 18.

  In FIGS. 4 and 6, the hatched engagement recesses 18 and engagement protrusions 16 have the same shape and the same size, and the same depth and protrusion height. Further, it is desirable that the inclination angle of the inclined edge is the same.

  The drive gear 8 is connected to a micromotor (not shown) via a reduction gear, and the driven gear 9 shown in FIG. 2 is connected to the dead cam 4 via an idle gear 19.

  When the transmission mechanism according to one embodiment of the present invention configured as described above operates as a motor-driven electric lock, the engagement recess 18 of the drive gear 8 and the engagement protrusion 16 of the driven gear 9 are fitted together. In this state, the driving gear 8 and the driven gear 9 are integrally connected because they are held metastable by the elastic force of the biasing spring 13.

  Here, the fact that the drive gear 8 and the driven gear 9 are connected in a metastable manner means that the mechanism shown in FIG. 3 operates as a clutch with a so-called torque limiter.

  That is, when a load torque is applied to the driven gear 9 during rotation of the micromotor and a difference occurs between the load torque and the drive torque of the drive gear 8, there is a difference between the engagement protrusion 16 and the engagement recess 18. As a result, a wedge action is generated at the inclined edge of the rim, and the engagement protrusion 16 is detached from the engagement recess 18 and tries to ride on the portion not hatched in FIG.

  However, since the driven gear 9 is pressed against the drive gear 8 by the elastic force of the urging spring 13, the drive and driven gears 8 and 9 rotate in an integrally coupled state unless the torque difference becomes excessive. Then, the driving force of the micromotor is amplified and transmitted to the dead cam 4, and the dead bolt 1 (see FIG. 1) is inserted into the strike hole of the door frame or pulled out to lock and unlock the door opening.

  At this time, the maximum transmission torque that becomes the limit for operating the torque limiter depends on both the inclination of the engaging protrusion 18 and the inclined edges 17 and 17 of the engaging recess and the elasticity of the biasing spring 13. It goes without saying that various changes can be made by changing.

  On the other hand, when it becomes impossible to lock and unlock as an electric lock due to a power failure, battery overdischarge, or the like, the dead cam 4 is rotated in a predetermined direction by a key turn from the outdoor side and a thumb turn (not shown) from the indoor side.

  At this time, since the micromotor is stopped, the load torque applied to the drive gear 8 via the reduction gear train becomes excessive, and the driven action is caused by the wedge action generated between the engagement protrusion 16 and the engagement recess 18. The gear 9 moves in a direction away from the drive gear 8 against the elasticity of the biasing spring 13.

  Since the driven gear 9 rotates while moving in the thrust direction away from the drive gear 8, the dead cam 4 rotates in a predetermined direction integrally with the key lock or thumb turn, and thus can be locked and unlocked by the key lock or thumb turn. become.

  At this time, since the locking operation and the unlocking operation are normally reversed in the rotation direction of the combined key or thumb turn, the inclined edges on both sides of the engaging protrusion 16 and the engaging recess 18 are necessary.

  Further, when the engagement protrusion 16 is separated from the engagement recess 18 and rides on the flat surface portion, and further rotates and fits into the engagement recess 18 again, the one inclined edge and the other inclined edge are joined. In addition, since they are fitted after sliding, there is no sudden fitting and noise, and the locking / unlocking operation with the key lock or thumb turn is quiet and smooth.

  Furthermore, since torque is transmitted in the tangential direction in the engagement of the engaging protrusion and the engaging recess as a torque limiter, the shape of the engaging protrusion and the recesses 16 and 18 is a sector shape having a long radial dimension. However, the present invention can be applied to other shapes, for example, a frustoconical engagement protrusion and a bowl-shaped engagement recess (both not shown) fitted to the engagement protrusion.

  Further, torque can be transmitted if at least one engaging protrusion 16 and one engaging recess 18 are provided, but if a plurality of sets are symmetrically set with respect to the gear rotation center, rotation is smooth.

  The present invention is not limited to the illustrated embodiment, and can be implemented with various modifications.

  For example, in the illustrated embodiment, the engagement protrusion 16 is formed on the driven gear 9 and the engagement recess 18 is formed on the drive gear 8. It is.

The partial side view of the lock box of the electric lock which shows an example of the conventional drive mechanism. FIG. 3 is a schematic partial sectional plan view of a clutch mechanism used in the drive mechanism according to the present invention. Sectional drawing of a clutch mechanism. The top view of a drive gearwheel. The bottom view of a drive gearwheel. The bottom view of a driven gear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dead bolt 2 Lock box 4 Dead cam 5 Reduction gear train 7 Base shaft 8 Drive gear 9 Driven gear 13 Energizing spring 16 Engagement protrusion 17 Inclined edge 18 Engagement recessed part

Claims (2)

  Each has a drive gear and a driven gear rotatably supported on the base shaft so that the drive and driven gears can be rotated independently of each other, and the driven gear can be moved along the rotation axis. In addition to guiding, the driven gear is urged in a direction close to the drive gear, and an engagement protrusion having an inclined portion on one of the mutually opposing surfaces of the drive gear and the driven gear is formed on the engagement protrusion. A motor drive characterized by forming an engaging recess of the same shape that fits on the other surface facing each other, connecting a drive gear to a micromotor through a reduction gear train, and connecting a driven gear to a dead cam. Electric lock driving force transmission mechanism.   2. The engagement protrusion is a fan shape having inclined edges formed at least on both side ends, and the engagement recess is a recess having the same shape and the same size as the engagement protrusion. Drive force transmission mechanism for motor-driven electric locks.

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