JP2020016056A - Electric lock - Google Patents

Abstract

To provide an electric lock capable of reducing rotational torque when a thumb turn is manually operated.SOLUTION: An electric lock of the present invention includes: a cam which rotates around a rotary shaft together with a thumb turn and extends along the rotary shaft; a first spur gear which is arranged at one end of the cam and rotates around the rotary shaft; a motor which drives the rotary shaft and an output shaft which extends to a twisted position to rotate by input of an unlocking signal; a first bevel gear arranged coaxially with the output shaft at one end of the output shaft; and a clutch mechanism which is arranged between the first spur gear and the first bevel gear. The clutch mechanism has a plurality of gears threadedly engaged with each of the first spur gear and the first bevel gear, transmits the rotation of the first bevel gear to the first spur gear, and suppresses the transmission of the rotation of the first spur gear to the first bevel gear.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electric lock.

2. Description of the Related Art Conventionally, an electric lock configured to be unlockable by inputting an unlocking signal is known.
As such an electric lock, Patent Document 1 discloses a configuration including a motor connected to a thumb turn via a plurality of gears. In this electric lock, the rotation of the motor in response to the input of the unlock signal enables the thumb turn to rotate through the gears to unlock.

JP 2005-023688 A

  However, in the above-mentioned conventional electric lock, when the thumb turn is manually operated and the electric lock is unlocked and unlocked, it is necessary to rotate a motor connected to the thumb turn through a plurality of gears. There was a problem of becoming.

  Therefore, an object of the present invention is to provide an electric lock that can reduce a rotational torque when a thumb turn is manually operated.

  In order to solve the above-described problem, the electric lock of the present invention rotates around a rotation axis together with a thumb turn, and a cam extending along the rotation axis, and is disposed at one end of the cam, and is arranged around the rotation axis. A first spur gear that rotates, a motor that rotationally drives an output shaft that extends to a position twisted with the rotation shaft by inputting an unlocking signal, and a motor that is coaxially arranged with the output shaft at one end of the output shaft. A first bevel gear, and a clutch mechanism disposed between the first spur gear and the first bevel gear, wherein the clutch mechanism includes the first spur gear and the first bevel gear. A plurality of gears screwed with the respective gears, wherein the rotation of the first bevel gear is transmitted to the first spur gear, and the rotation of the first bevel gear is transmitted to the first bevel gear; To be done.

  The clutch mechanism further includes a second spur gear screwed with the first spur gear, and a second bevel gear arranged coaxially with the second spur gear and screwed with the first bevel gear. A clutch disc disposed coaxially with the common shaft between the second spur gear and the second bevel gear, wherein the clutch disc controls rotation of the second bevel gear. The transmission to the second spur gear and the transmission of the rotation of the second spur gear to the second bevel gear may be suppressed.

  Further, the clutch disc may include an engagement protrusion protruding toward the second bevel gear side along the common shaft.

  In the second bevel gear, an engagement groove with which the engagement protrusion engages may be formed on an inner end surface of the second bevel gear facing the second spur gear along the common axis.

  Further, the clutch disc may be biased toward the second bevel gear side along the common shaft.

  The output shaft of the motor may be perpendicular to the rotation axis in a plan view as viewed from a direction orthogonal to the rotation shaft and the output shaft in the thumb turn.

  In the electric lock of the present invention, a clutch mechanism is arranged between a first bevel gear arranged at one end of an output shaft of a motor and a first spur gear arranged at one end of a cam which rotates together with a thumb turn. Have been. Therefore, when the thumb turn is manually rotated, the rotation torque transmitted to the first spur gear via the cam is suppressed from being transmitted to the first bevel gear by the clutch mechanism. There is no need to rotate the output shaft of the motor in which one bevel gear is arranged. This makes it possible to reduce the rotational torque when manually operating the thumb turn.

(A) It is a front view of the door to which the electric lock concerning one embodiment of the present invention was adopted, (b) It is a rear view of the door shown in (a). It is a perspective view of the door shown in FIG. It is a perspective view showing the locking part of the electric lock concerning one embodiment of the present invention. It is a top view of the locking part shown in FIG. It is a side view of the locking part shown in FIG. FIG. 4 is an enlarged view of the clutch mechanism shown in FIG. 3 excluding a second bevel gear. FIG. 4 is a perspective view showing the back side of the tooth surface of the second bevel gear shown in FIG. 3. FIG. 4 is an enlarged view of the clutch mechanism shown in FIG. 3 excluding a second bevel gear and a part of a second spur gear.

Hereinafter, an electric lock 1 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, an electric lock 1 of the present invention is a lock capable of unlocking and locking a door 2 by inputting an electric or magnetic unlocking signal. used.
The door 2 has a plate-shaped door body 20 whose front and back faces in the front-rear direction, a knob 21 that is attached to the door body 20, and opens and closes the door 2 by an operation. And a latch 22 that can be moved in and out.

The electric lock 1 has a deadbolt 3 for locking and unlocking the door 2 based on the unlocking signal, a receiving unit 4 for receiving an input of the unlocking signal, and an input of the unlocking signal to the receiving unit 4. And a locking unit 10 for operating the position of the dead bolt 3 while rotating the lock.
The deadbolt 3 locks the door 2 by protruding outward from the side edge of the door 2 and unlocks the door 2 by retracting the door 2 from the side edge of the door 2. Note that the deadbolt 3 may be provided on the door 2 instead of the electric lock 1.

  As shown in FIGS. 3 to 5, the locking unit 10 includes a cam 11 that rotates around the rotation axis O1 together with the thumb turn 30, a first spur gear 12 disposed at one end of the cam 11, and an input of an unlocking signal. As a result, the motor 13 that rotates the output shaft 13A is rotated, the first bevel gear 14 disposed at one end of the output shaft 13A, and the first bevel gear 12 and the first bevel gear 14 are disposed. And a clutch mechanism 15.

The cam 11 extends along the rotation axis O1. The rotation axis O1 extends along the direction in which the door 2 is opened and closed.
The first spur gear 12 rotates around the rotation axis O1. The first spur gear 12 is a semicircular gear, and is arranged coaxially with the rotation axis O1. In the outer peripheral edge portion of the first spur gear 12, the size of the central angle about the rotation axis O1 in the portion where the teeth are formed is 180 ° or less.

The motor 13 has an output shaft 13A extending to the position twisted with the rotation axis O1, and a motor body 13B to which the output shaft 13A is connected.
As shown in FIG. 4, the output shaft 13A is at right angles to the rotation axis O1 in a plan view as viewed from a direction orthogonal to the rotation axis O1 of the thumb turn 30 and the output shaft 13A. The motor main body 13B has a straight cylindrical shape, and extends along the output shaft 13A.

The first bevel gear 14 is arranged coaxially with the output shaft 13A. The first bevel gear 14 has a trapezoidal conical shape whose diameter gradually increases toward the motor body 13B along the output shaft 13A.
The clutch mechanism 15 has a plurality of gears that are screwed with the first spur gear 12 and the first bevel gear 14, respectively.

That is, the clutch mechanism 15 includes a second spur gear 16 that is screwed with the first spur gear 12, and a second bevel gear that is disposed coaxially with the second spur gear 16 and that is screwed with the first bevel gear 14. 17 and a clutch disc 18 (see FIG. 6) disposed between the second spur gear 16 and the second bevel gear 17.
The common axis O2 of the second spur gear 16 and the second bevel gear 17 extends parallel to the rotation axis O1.

Further, the clutch mechanism 15 includes a support shaft 19 that penetrates the second spur gear 16 and the second bevel gear 17 integrally and is arranged coaxially with the common shaft O2.
The support shaft 19 is arranged coaxially with the common shaft O2. The support shaft 19 is orthogonal to the output shaft 13A of the motor 13.

The second spur gear 16 is a circular gear having a smaller diameter than the first spur gear 12 and having teeth formed all around the outer peripheral edge. An accommodation recess 16 </ b> A recessed along the common axis O <b> 2 is formed in the inner peripheral portion of the second spur gear 16.
The effective diameter of the second bevel gear 17 is equal to the effective diameter of the first bevel gear 14. Here, the effective diameter refers to an intermediate diameter between the maximum diameter and the minimum diameter.
The second bevel gear 17 has a trapezoidal conical shape whose diameter gradually increases toward the second spur gear 16 along the common axis O2. The maximum diameter of the second bevel gear 17 is equal to the outer diameter of the second spur gear 16.

As shown in FIG. 6, the clutch board 18 has a ring shape. The clutch disc 18 has a common shaft O2 inserted therein and is arranged coaxially with the common shaft O2. The clutch disc 18 is arranged so as to fit into the accommodation recess 16 </ b> A of the second spur gear 16.
The clutch disc 18 has an engagement projection 18A protruding toward the second bevel gear 17 along the common axis O2. The engagement projection 18A is formed on an outer end face of the clutch disc 18 facing the second bevel gear 17 along the common axis O2.

  A plurality of the engagement protrusions 18A are arranged on the outer end surface of the clutch disc 18 at intervals in a circumferential direction around the common axis O2. In the illustrated example, four engagement protrusions 18 </ b> A are arranged on the clutch board 18. The engagement projection 18A has a hemispherical shape. The number of the engagement projections 18A can be arbitrarily changed.

  As shown in FIG. 7, an engagement groove 17A in which an engagement protrusion 18A engages is formed on an inner end surface of the second bevel gear 17 facing the second spur gear 16 along the common axis O2. I have. Four engagement grooves 17A are arranged at positions facing the engagement protrusions 18A. The engagement groove 17A has a circular shape in a front view.

When the engagement protrusion 18A is fitted into the engagement groove 17A, the engagement groove 17A and the engagement protrusion 18A are circumferentially engaged.
Therefore, with the rotation of the second bevel gear 17 in the circumferential direction, the clutch disc 18 rotates in the circumferential direction in synchronization with the second bevel gear 17. Then, the second spur gear 16 in which the clutch disc 18 is fitted in the housing recess 16 </ b> A rotates in synchronization with the second bevel gear 17.

As shown in FIG. 8, the clutch disc 18 is biased toward the second bevel gear 17 along the common axis O2. A spring washer 40 is disposed in a portion of the housing recess 16A located on the side of the second spur gear 16 along the common axis O2 with respect to the clutch disc 18.
The spring washer 40 is arranged coaxially with the common axis O2. The clutch disc 18 is urged by the spring washer 40 toward the second bevel gear 17 along the common axis O2. For this reason, the engagement projection 18A is urged toward the second bevel gear 17 side.

The clutch mechanism 15 transmits the rotation of the first bevel gear 14 to the first spur gear 12 and suppresses the rotation of the first spur gear 12 from being transmitted to the first bevel gear 14.
Such movement of the clutch mechanism 15 will be described in detail below together with the movement of each member.

First, the behavior of the clutch mechanism 15 when the motor 13 is driven will be described.
As shown in FIGS. 4 and 8, when the output shaft 13A of the motor 13 rotates, the first bevel gear 14 arranged on the output shaft 13A rotates. Thereby, the second bevel gear 17 of the clutch mechanism 15 that is screwed with the first bevel gear 14 rotates.

  At this time, the second bevel gear 17 is pressed from the first bevel gear 14 toward the second spur gear 16 along the common axis O2 by the tooth surface profile of the first bevel gear 14. Thus, the clutch disc 18 pressed by the second bevel gear 17 is displaced toward the second spur gear 16 against the urging force of the spring washer 40.

At this time, the engagement protrusion 18A of the clutch disc 18 is engaged with the engagement groove 17A of the second bevel gear 17. Therefore, the clutch disc 18 rotates with the rotation of the second bevel gear 17. Thereby, the second spur gear 16 with the clutch disc 18 fitted inside rotates, and the first spur gear 12 screwed with the second spur gear 16 rotates.
Thus, the clutch mechanism 15 transmits the rotation of the second bevel gear 17 to the second spur gear 16, and the clutch mechanism 15 transmits the rotation of the first bevel gear 14 to the first spur gear 12 is transmitted.

Next, the behavior of the clutch mechanism 15 when the thumb turn 30 is manually rotated will be described.
When the thumb turn 30 is manually rotated, the cam 11 connected to the thumb turn 30 rotates around the rotation axis O1. As a result, the first spur gear 12 disposed at one end of the cam 11 rotates, so that the second spur gear 16 screwed with the first spur gear 12 rotates around the common axis O2.

At this time, the second spur gear 16 and the clutch disc 18 are biased by the spring washer 40 toward the second spur gear 16 along the common axis O2. On the other hand, since the motor 13 is not rotating, the second bevel gear 17 does not receive the pressing force from the first bevel gear 14.
Therefore, a gap is easily generated between the clutch disc 18 and the second bevel gear 17, and the engagement groove 17 </ b> A of the second bevel gear 17 is easily disengaged from the engagement projection 18 </ b> A of the clutch disc 18.

When the rotational torque of the second spur gear 16 is transmitted to the second bevel gear 17 via the clutch disc 18, the repulsive force along the common axis O 2 received from the spherical surface of the engagement projection 18 A of the clutch disc 18. The second bevel gear 17 is separated from the clutch disc 18 in the direction of the common axis O2. Thereby, the second spur gear 16 idles with respect to the second bevel gear 17.
In this manner, the clutch disc 18 prevents the rotation of the second spur gear 16 from being transmitted to the second bevel gear 17, so that the clutch mechanism 15 allows the rotation of the first spur gear 12 to The transmission to the bevel gear 14 is suppressed.

As described above, according to the electric lock 1 according to the present embodiment, the first bevel gear 14 disposed at one end of the output shaft 13A of the motor 13 and the one end of the cam 11 rotating together with the thumb turn 30 are provided. The clutch mechanism 15 is disposed between the first spur gear 12 disposed.
For this reason, when the thumb turn 30 is manually rotated, the rotation torque transmitted to the first spur gear 12 via the cam 11 is suppressed from being transmitted to the first bevel gear 14 by the clutch mechanism 15. This eliminates the need to rotate the output shaft 13A of the motor 13 on which the first bevel gear 14 is disposed. Thereby, the rotational torque when manually operating the thumb turn 30 can be reduced.

Further, since the clutch mechanism 15 includes the second spur gear 16, the second bevel gear 17, and the clutch disc 18, the function of the clutch mechanism 15 can be realized with a small number of parts.
Also, since the engagement protrusion 18A is formed on the clutch disc 18 and the engagement groove 17A is formed on the second bevel gear 17, the engagement protrusion 18A is engaged with the engagement groove 17A, so that the second protrusion is formed. The rotational force of the bevel gear 17 can be reliably transmitted to the clutch disc 18.

  Further, since the clutch disc 18 is urged toward the second bevel gear 17, the pressing force applied from the first bevel gear 14 toward the second bevel gear 17 is applied to the second bevel gear 17. 17 can oppose the urging force received from the clutch board 18. Thereby, the second bevel gear 17 and the clutch disc 18 can be firmly engaged with each other, and the rotational torque of the second bevel gear 17 is transmitted to the second spur gear 16 via the clutch disc 18. It can be transmitted reliably.

  Further, since the output shaft 13A of the motor 13 forms a right angle with respect to the rotation axis O1 in a plan view viewed from a direction orthogonal to the rotation axis O1 and the output shaft 13A of the thumb turn 30, the motor 13 rotates. It is possible to suppress bulkiness in the direction of the axis O1, and the electric lock 1 can be made compact.

  It should be noted that the above-described embodiments are merely examples of typical embodiments of the present invention. Therefore, various modifications may be made to the above embodiment without departing from the spirit of the present invention.

For example, in the above embodiment, the configuration in which the clutch mechanism 15 includes the second spur gear 16, the second bevel gear 17, and the clutch disc 18 has been described, but the present invention is not limited to such a mode. The clutch mechanism 15 may be constituted by other gears or clutch members.
Further, in the above-described embodiment, the configuration in which the clutch disc 18 is disposed between the second spur gear 16 and the second bevel gear 17 has been described, but the present invention is not limited to such a mode. For example, a plurality of gears may be arranged on the output shaft 13A of the motor 13, and the clutch board 18 may be arranged between them.

Further, in the above-described embodiment, the configuration in which the engagement protrusion 18A is formed on the clutch disc 18 has been described, but the present invention is not limited to such an aspect. The engagement protrusion 18 </ b> A may not be formed on the clutch disc 18, but may be formed on the inner end surface of the second bevel gear 17 so as to project toward the second spur gear 16.
Further, in the above-described embodiment, the configuration in which the engagement protrusion 18A has a hemispherical shape has been described, but the present invention is not limited to such an aspect. The shape of the engagement projection 18A can be arbitrarily changed.

In the above-described embodiment, the configuration in which the engagement groove 17A is formed on the inner end surface of the second bevel gear 17 facing the second spur gear 16 along the common axis O2 has been described. However, the present invention is not limited to this. The engagement groove 17 </ b> A may not be formed on the inner end surface of the second bevel gear 17, and an engagement groove that is recessed toward the second spur gear 16 may be formed on the clutch disc 18.
Further, in the above-described embodiment, the configuration in which the engagement groove 17A has a circular shape in plan view has been described, but the present invention is not limited to such an aspect. The shape of the engagement groove 17A can be arbitrarily changed.

  Further, in the above-described embodiment, the configuration in which the clutch disc 18 is biased toward the second bevel gear 17 side has been described, but the present invention is not limited to such an aspect. The clutch disc 18 may not be biased toward the second bevel gear 17 side.

  Further, in the above-described embodiment, the configuration has been described in which the output shaft 13A is perpendicular to the rotation axis O1 in a plan view, but is not limited to such an aspect. The output shaft 13A may form an angle that is not perpendicular to the rotation axis O1 in plan view.

  Further, the present invention is not limited to the above-described modified examples, and these modified examples may be selected and appropriately combined, or may be modified in other ways.

DESCRIPTION OF SYMBOLS 1 Electric lock 11 Cam 12 1st spur gear 13 Motor 14 1st bevel gear 15 Clutch mechanism 16 2nd spur gear 17 2nd bevel gear 17A Engagement groove 18 Clutch board 18A Engagement projection 30 Thumb turn

Claims (6)

A cam that rotates about a rotation axis with the thumb turn and extends along the rotation axis;
A first spur gear disposed at one end of the cam and rotating around the rotation axis;
A motor that rotates an output shaft extending to the position of the rotation shaft and the torsion by inputting an unlocking signal,
A first bevel gear arranged coaxially with the output shaft at one end of the output shaft;
A clutch mechanism disposed between the first spur gear and the first bevel gear,
The clutch mechanism has a plurality of gears screwed with the first spur gear and the first bevel gear, respectively, and transmits rotation of the first bevel gear to the first spur gear, An electric lock for suppressing rotation of a first spur gear from being transmitted to the first bevel gear. The clutch mechanism,
A second spur gear screwed with the first spur gear;
A second bevel gear arranged coaxially with the second spur gear and screwed with the first bevel gear;
A clutch disc disposed coaxially with the common shaft between the second spur gear and the second bevel gear;
2. The clutch disc according to claim 1, wherein the clutch disc transmits the rotation of the second bevel gear to the second spur gear and suppresses the rotation of the second bevel gear from being transmitted to the second bevel gear. 3. Electric lock.   3. The electric lock according to claim 2, wherein the clutch disc includes an engagement protrusion protruding toward the second bevel gear along the common shaft. 4.   The engagement groove with which the engagement projection engages is formed on the inner end surface of the second bevel gear that faces the second spur gear along the common axis. 3. The electric lock according to 3.   5. The electric lock according to claim 2, wherein the clutch disc is urged toward the second bevel gear side along the common shaft. 6. The output shaft in the motor,
The rotation axis in the thumb turn, and a right angle to the rotation axis in a plan view viewed from a direction orthogonal to each of the output shaft, according to any one of claims 1 to 5, wherein An electric lock as described.

Images