JP6260028B2 - Vehicle door latch device - Google Patents

Description

  According to the present invention, when the door inside handle is opened when the lock mechanism is in the locked state, the one-motion operation that can open the door by switching the locked state to the unlocked state is possible. The present invention relates to a vehicle door latch device that can be in a double lock state in which a lock mechanism does not switch from a locked state to an unlocked state even when a lock operating member is unlocked.

As a conventional vehicle door latch device of this type, for example, one described in Patent Document 1 is known.
A door latch device described in Patent Document 1 is linked to a vehicle interior lock operation member of a door, and can be turned to a lock position and an unlock position based on an operation of the vehicle interior lock operation member; Linked to the motor and driven by the motor and the rotation of the first lock lever to rotate the door to the unlocked position and the unlocked position to allow the door to be opened by the vehicle exterior opening operation handle. A movable second lock lever, and a biasing force applied to the first lock lever and the second lock lever so that the second lock lever can be moved from the lock position to the unlock position by following the first lock lever. The first lock lever is brought into contact with the first lock lever at the lock position on the basis of the operation of the torsion coil spring that causes the door to act and the vehicle interior opening operation handle of the door. And an inside lever that forcibly rotates the second lock lever to the unlock position and allows the door to be opened, and a double unlock position that allows the second lock lever to rotate from the lock position to the unlock position. And a block that can move to a double lock position that prevents the second lock lever from rotating from the lock position to the unlock position by contacting the second lock lever or a member that moves in synchronization with the second lock lever. When the inside lever is operated based on the operation of the vehicle interior opening operation handle when the block member is in the double lock position, the first lock lever in the lock position is in contact with the inside lever. Moves to the unlocked position against the urging force of the torsion coil spring, but the second lock in the locked position Bar, by member which moves in synchronism with the second locking lever or abuts against the blocking member, in which so as to be held in the locked position.

Japanese Patent No. 4972803

  In the door latch device described in Patent Document 1, the first lock lever and the second lock lever are configured so that the second lock lever can be driven from the lock position to the unlock position by following the first lock lever. A torsion coil spring that applies an urging force to the first and second lock levers is wound around a coaxial support shaft that pivotally supports the first lock lever and the second lock lever. Therefore, a space for arranging the torsion coil spring must be secured between the opposing surfaces of the first lock lever and the second lock lever, and the pivot of the first lock lever and the second lock lever is correspondingly increased. The dimension of the support in the direction of the support shaft becomes large. In this case, there is a problem that the thickness of the operation unit in which the operation mechanism such as the motor, the first and second lock levers, the inside lever, and the like is assembled increases in the in-vehicle direction and the door latch device becomes large.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle door latch device that can be miniaturized by reducing the size of the first and second lock lever pivots in the direction of the support shaft. .

According to the present invention, the above problem is solved as follows.
The first aspect of the invention is linked to the vehicle interior lock operation member of the door and is pivotally supported by the support shaft so that it can be rotated to the lock position and the unlock position based on the operation of the vehicle interior lock operation member. A lock that is pivotally supported by the first lock lever and the support shaft, and that disables the door from being opened by the vehicle exterior opening operation handle by driving the electric drive source and following the first lock lever. A second lock lever that is pivotable to an unlock position that enables the position and the door to be opened, and a position that is spaced apart from the support shaft in a direction perpendicular to the axial direction. A spring for applying an urging force to the first lock lever and the second lock lever so that the first lock lever can be rotated from the locked position to the unlocked position; Based on the operation of the inner opening operation handle, the first lock lever and the second lock lever are moved to the unlock position by contacting the first lock lever in the lock position, and the door can be opened. The inside lock lever, the double unlock position that allows the second lock lever to rotate from the lock position to the unlock position, and the second lock lever or a member that moves in synchronization with the second lock lever. And a block member that can be moved to a double lock position to prevent rotation of the second lock lever from the locked position to the unlocked position.

  In a second aspect based on the first aspect, the spring is a torsion coil spring, and the coil portion of the torsion coil spring is locked to one of the first lock lever and the second lock lever. Wrapped and supported on a support shaft provided on the lever, one foot of the torsion coil spring is placed on one of the first lock lever and the second lock lever, and the other The foot pieces are respectively engaged with either one of the first lock lever and the second lock lever, and the coil portion of the torsion coil spring is connected to the other lock lever with respect to the support shaft. It is characterized by being arranged at a position that does not overlap in the axial direction.

  According to the vehicle door latch device of the present invention, the second lock lever is attached to the first lock lever and the second lock lever so that the second lock lever can be driven from the lock position to the unlock position by following the first lock lever. By providing the spring for applying the force at a position separated from the support shaft pivotally supporting the first lock lever and the second lock lever in a direction perpendicular to the axial direction, the spring is provided with the first lock lever and the second lock lever. Compared with the conventional door latch device provided on the support shaft that pivotally supports the lever facing surface, the dimensions of the first and second lock lever support portions in the support shaft direction can be reduced. As a result, the door latch device can be downsized.

It is the front view which looked at the door latch device for vehicles concerning the present invention from the vehicles back. Similarly, it is the side view which looked at the door latch device from the car inside. Similarly, it is an exploded perspective view of a door latch device. It is a side view which shows the internal structure of the operation unit in an unlocked state. It is the disassembled perspective view which looked at the 1st lock lever and the 2nd lock lever from the vehicle outside. Similarly, it is a side view of the first lock lever and the second lock lever after assembly. It is a side view of the principal part of the operation unit in a locked state. It is a side view of the principal part of the operation unit in a double lock state. It is a side view of the principal part of an operation unit when an inside handle is opened in a double lock state. It is a side view of the principal part in the middle of an operation | movement when an inside handle is opened in a locked state. It is a side view of the principal part at the time of completion | finish of operation | movement when an inside handle is opened in a locked state.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the rear side in FIG. 1 and the left side in FIG. 2 are referred to as “front”, the front side in FIG. 1 and the right side in FIG. 2 are referred to as “rear”, and the right side and FIG. The rear side of the drawing in FIG. 2 is referred to as “the vehicle outer side”, and the left side in FIG. 1 and the front side of the drawing in FIG.

  As shown in FIGS. 1 to 4, the door latch device 1 is attached to the inner side of the rear end of a front door (hereinafter referred to as a door) of an automobile and has a meshing mechanism 2 for restraining the door to a closed position. A unit 3 and an operation unit 4 assembled to the meshing unit 3 are provided.

  The meshing unit 3 has a body 5 made of synthetic resin, and a meshing mechanism 2 including a latch 7 that can be engaged with the striker 6 on the vehicle body side and a ratchet 8 that can be engaged with the latch 7 is included in the body 5. Contained. An open lever 9 that can rotate integrally with the ratchet 8 is pivotally supported on the front surface of the body 5. When the door is closed, the striker 6 is engaged with the latch 7, and the ratchet 8 is engaged with the latch 7, thereby preventing the latch 7 from rotating in the opening direction (clockwise in FIG. 1), The door is restrained in the closed position.

  The operation unit 4 includes a synthetic resin casing 11 attached to the front surface of the body 5 via a back plate 10 and a synthetic resin cover 12 that closes an opening of the casing 11 facing the vehicle interior. In FIG. 4, the meshing unit 3 and the cover 12 are omitted in order to clearly show the internal structure of the operation unit 4.

  The component housing space formed between the casing 11 and the cover 12 includes a first motor 13 for locking / unlocking operation that serves as an electric drive source, and a vehicle interior / exterior direction integrally provided in the casing 11. A worm wheel 14 that is pivotally supported by a supporting shaft 111 and that can be rotated by driving the first motor 13, a second motor 15 for double lock operation, and a supporting shaft 112 that is provided in the casing 11 and faces the inside and outside of the vehicle. Based on the block lever 16 pivotally supported and rotated by a predetermined angle by the drive of the second motor 15, the lock provided on the vehicle exterior side of the door, and the lock and unlock operations by the key cylinder KC for unlock operation. A first key lever 17 that can be rotated from a position in a locking direction (counterclockwise in FIG. 4) and an unlocking direction (clockwise in FIG. 4); An upper end portion is coupled to the lower portion of the lever 17, and in synchronization with the operation of the first key lever 17 accompanying the operation of the key cylinder KC, the locking direction (clockwise in FIG. 4) and the unlocking direction (see FIG. 4). 4 is pivoted to a second key lever 18 that rotates by a predetermined angle (counterclockwise in FIG. 4) and a support shaft 113 that is coaxial with the second key lever 18, and rotates between an unlock position shown in FIG. 4 and a lock position shown in FIG. A movable linkage lever 19 is pivotally supported between the casing 11 and the cover 12 by a support shaft 114 that is provided integrally with the casing 11 and faces the inside and outside of the vehicle, and drives the key cylinder KC, the lock knob LK, and the first motor 13. The first lock lever 20 that can be rotated to the unlock position shown in FIG. 4 and the lock position shown in FIG. -20 and pivotally supported by a support shaft 114 that is coaxial with the first lock lever 20, and a biasing force of a torsion coil spring 30 to be described later acts integrally with the first lock lever 20, and the linkage lever 4 and the second lock lever 21 that can be rotated to the unlock position shown in FIG. 4 and the lock position shown in FIG. 7, and the second lock lever 21, together with the second lock lever 21, as shown in FIG. 4. 7 swings from the unlock position to the lock position shown in FIG. 7 or vice versa, and when the second lock lever 21 is in the lock position, the second lock lever 21 moves upward from the lock position and the second lock lever 21 is unlocked. When in the locked position, the first lift lever 22 is movable in the upward opening direction from the unlock position, and is provided coaxially with the first lift lever 22. 4, the unlocking position shown in FIG. 4 integrally with the first lift lever 22, the second lift lever 23 movable in the locking position shown in FIG. 7 and the upward opening direction, and the vehicle provided integrally with the casing 11. An inside lever 24 that is pivotally supported by an inside / outside support shaft 115 and rotates by a predetermined angle from the standby position shown in FIG. 4 in the open direction (clockwise) by opening an inside handle IH provided on the inside of the door. The lower end of the first and second lift levers 22 and 23 is pivotally supported by a front and rear support shaft 116 provided at the lower portion of the casing 11 and swingable in the front and rear direction. In addition, an outside lever 25 linked to an outside handle provided on the vehicle exterior side of the door is provided.

  The first motor 13, the worm wheel 14, the linkage lever 19, the first and second lock levers 20, 21 and the like are unlocked so that the engagement state of the meshing mechanism 2 with the striker 6 can be released, and cannot be released. An operation mechanism that can be switched to a locked state is configured. The locked state of the operating mechanism is a state where at least the linkage lever 19 and the second lock lever 21 are in the locked position, and the unlocked state of the operating mechanism is the linkage lever 19, the first and second lock levers 20, 21. Are in the unlocked position. Therefore, even if only the first lock lever 20 moves to the unlock position in the locked state, the lock state of the operation mechanism is maintained unless the linkage lever 19 and the second lock lever 21 move to the lock position.

  In the lower part of the casing 11, an operating force transmission member 26 that can transmit the operating force of the connecting portion 201 of the first lock lever 20, the connecting portion 241 of the inside lever 24, and the inside handle IH that forms the door inside opening operation handle. A lid member 28 made of synthetic resin that conceals the end of the operation force transmission member 27 that can transmit the operation force of the lock knob LK that forms the door interior lock operation member of the door is openably and closably connected. The lid member 28 is opened during the assembly of the parts to the casing 11 and is closed after the operating force transmission members 26 and 27 are connected to the connecting portion 201 of the first lock lever 20 and the connecting portion 241 of the inside lever 24, respectively. Is done.

  At the front of the linkage lever 19, when the linkage lever 19 is in the lock position and the block lever 16 is in a double lock position (see FIGS. 8 and 9) described later, a block portion 161 provided on the block lever 16 is provided. A protrusion-shaped blocked portion 191 that can be engaged with is provided. As shown in FIG. 9, the locked position of the second lock lever 21 synchronized with the linkage lever 19 and the linkage lever 19 by engaging the block portion 191 of the block lever 16 in the double lock position with the blocked portion 191. To the unlock position is prevented.

  As shown in FIG. 7, when the linkage lever 19 is in the locked position, the first and second key levers 17 and 18 rotate in the unlocking direction from the neutral position based on the unlocking operation of the key cylinder KC. When the key lever 18 contacts one side of the contacted portion 192 of the linkage lever 19, the linkage lever 19 rotates counterclockwise and moves to the unlock position shown in FIG. Further, as shown in FIG. 4, when the linkage lever 19 is in the unlock position, the second and second key levers 17 and 18 rotate in the locking direction from the neutral position based on the locking operation of the key cylinder KC. When the key lever 18 abuts against the other side portion (the portion opposite to the one side portion) of the contacted portion 192 of the linkage lever 19, the linkage lever 19 rotates in the clockwise direction and is shown in the lock position shown in FIG. To turn.

  The connecting portion 201 at the lower end of the first lock lever 20 is connected to the lock knob LK via the operating force transmission member 27. Thereby, the lock / unlock operation of the lock knob LK is transmitted to the first lock lever 20 via the operation force transmitting member 27, and the first lock lever 20 has the unlock position shown in FIG. 4 and the lock shown in FIG. Rotate to position.

  The first lift lever 22 can be rotated by a predetermined angle in the front-rear direction around the operating end 251 by inserting the operating end 251 of the outside lever 25 into a drum-shaped bearing hole 222 provided in the lower part. It is pivotally supported.

  The lower end portion of the first lock lever 20 is provided with a one-motion acting portion 202 to which the one-motion acting portion 242 provided on the inside lever 24 can directly contact when it is in the locked position.

  The second lock lever 21 rotated to the unlock position shown in FIG. 4 and the lock position shown in FIG. 7 is elastically held at each position by the elastic force of the holding spring 29 supported by the casing 11.

  As shown in FIGS. 4 to 6, the first lock lever 20 has a spring support portion facing forward for supporting a torsion coil spring 30 that biases the first lock lever 20 and the second lock lever 21. 203 is integrally provided so as not to face the lower part of the second lock lever 21, that is, to protrude forward from the front lower end 211 of the lower part of the second lock lever 21. The casing 303 is provided on a support shaft provided at a position where the portion 303 is separated from the support shaft 114 of the first and second lock levers 20 and 21 in a direction orthogonal to the axial direction, that is, on the side surface on the vehicle outer side of the spring support portion 203. It is supported by a support shaft 204 that protrudes in the direction toward the inside and outside of the vehicle. One foot piece 301 of the torsion coil spring 30 is formed on a locking projection 205 integrally provided on the side surface of the first lock lever 20 on the vehicle exterior side, and the other foot piece 302 is formed on the second lock lever 21. It is respectively latched by the latching protrusion 212 provided in the lower end part of the side surface outside a vehicle. Accordingly, the coil portion 303 of the torsion coil spring 30 is disposed at a position that does not overlap with the first lock lever 20 in the axial direction of the support shaft 114.

  The second lock lever 21 is applied with a biasing force in the counterclockwise direction, that is, the lock direction, with respect to the first lock lever 20 by the torsion coil spring 30. The second lock lever 21 urged in the lock direction has its lower upper edge abutted against the lower surface of the locking piece 206 provided on the upper edge of the first lock lever 20 and facing the vehicle outward direction, so that the lock direction In the normal state (the state shown in FIG. 4 and FIG. 7) in which the rotation is prevented, the first lock lever 20 is driven to integrally rotate from the lock position to the unlock position.

  As described above, the first lock lever 20 and the second lock lever 21 are biased so that the second lock lever 21 can be driven from the lock position to the unlock position by following the first lock lever 20. The torsion coil spring 30 to be actuated is supported by a support shaft 204 provided on a side surface of the first lock lever 20 on the vehicle outer side of the spring support portion 203 at a position protruding forward from the front lower end 211 of the lower portion of the second lock lever 21. When supported, the torsion coil spring 30 does not have to be fitted to the support shaft 114 that pivotally supports the torsion coil spring 30 between the opposed surfaces of the first lock lever 20 and the second lock lever 21 as in the conventional door latch device. Get better. As a result, it is not necessary to secure a space for disposing the torsion coil spring 30 between the opposing surfaces of the first lock lever 20 and the second lock lever 21, and the first lock lever 20, the second lock lever 21, Can be arranged close to the axial direction of the support shaft 114, and therefore the dimension of the pivot support portion of the first lock lever 20 and the second lock lever 21 in the support shaft 114 direction can be reduced. Thereby, the thickness of the operation unit 4 in the vehicle interior / exterior direction can be reduced, and the door latch device 1 can be downsized.

  As shown in FIG. 7, when the first and second lock levers 20 and 21 and the linkage lever 19 are in the locked position, the unlocking operation of the key cylinder KC is performed by the first key lever 17, the second key lever 18, and the linkage lever 19. The first lock lever 20 is transmitted to the first lock lever 20 via the second lock lever 21 and the torsion coil spring 30. As shown in FIG. 4, when the first and second lock levers 20, 21 and the linkage lever 19 are in the unlock position, the lock operation of the key cylinder KC is the same as the unlock operation. The signal is transmitted to the first lock lever 20 through the key lever 17, the second key lever 18, the linkage lever 19, the second lock lever 21, and the torsion coil spring 30.

  A first protrusion 214 protruding outward from the vehicle is provided on one side surface (surface facing the vehicle outer side) of the upper end portion of the operating arm portion 213 facing the upper side of the second lock lever 21. The engagement lever 19 is engaged with the elongated hole 193.

  A columnar second protrusion 215 that protrudes inward of the vehicle is provided on the surface of the operating arm 213 of the second lock lever 21 opposite to the surface on which the first protrusion 214 is provided. The second protrusion 215 is slidably engaged with the first long groove 221 provided in the first lift lever 22 in the vertical direction, whereby the second lock lever 21 and the first lift lever 22 are linked. ing.

  The second lock lever 21 is provided with first and second engagement arms 216 and 217, and the first engagement arm 216 and the second engagement arm 217 sandwich the rotation surfaces on both sides of the worm wheel 14. Are spaced apart from each other in the axial direction of the support shaft 114 and are also spaced apart by a predetermined angle in the rotational direction.

  The first engagement arm 216 has a rotational surface that is close to and opposed to one rotational surface of the worm wheel 14 (a surface that faces the cover 12), and is equidistant from the one rotational surface of the worm wheel 14 in the circumferential direction. It can contact | abut with respect to either of the three 1st engaging protrusions 141 provided in this. Further, the second engagement arm 217 has a rotation surface that is close to and opposed to the other rotation surface of the worm wheel 14 (a surface that faces the casing 11), and is provided with three second rotation surfaces provided on the other rotation surface of the worm wheel 14. It can come into contact with either of the two engaging protrusions 142. The second engagement protrusion 142 has the same shape as the first engagement protrusion 141 and is provided so as to be back-to-back and mirror-symmetrical. The illustration is omitted.

  The worm wheel 14 is rotated forward and backward by the rotation of the first motor 13 by meshing with the worm 31 fixed to the rotation shaft of the first motor 13.

  As shown in FIG. 7, when the linkage lever 19, the first and second lock levers 20, 21 are in the locked position, the first engagement arm 216 of the second lock lever 21 is connected to the first worm wheel 14. The second engagement arm 217 is located outside the rotation locus of the second engagement protrusion 142 of the worm wheel 14 and is located within the rotation locus of the first engagement protrusion 141.

  As shown in FIG. 4, when the linkage lever 19, the first and second lock levers 20, 21 are in the unlock position, the first engagement arm 216 of the second lock lever 21 is connected to the first worm wheel 14. The second engagement arm 217 is positioned within the rotation locus of the second engagement protrusion 142 of the worm wheel 14 and is located outside the rotation locus of the first engagement protrusion 141.

  A sector gear 162 is provided on the outer periphery of the block lever 16, and the sector gear 162 meshes with a worm 32 fixed to the rotating shaft of the second motor 15 so as to be reversibly reversible, thereby operating the operation switch and the key cylinder KC. Based on the rotation of the second motor 15 by the unlocking operation, it is possible to rotate between a double unlock position (see FIGS. 4 and 6) and a double lock position (see FIGS. 8 and 9). The second motor 15 is controlled so that it can be driven only when the linkage lever 19 is in the locked position.

  When the block lever 16 is in the double unlock position, the blocked portion 191 of the linkage lever 19 cannot be engaged with the portion of the block lever 16 adjacent to the linkage lever 19 and the block lever 16 is in the block position. When the linkage lever 19 is in the locked position, the block portion 161 that can be engaged with the blocked portion 191 of the linkage lever 19 and the release arm portion 181 provided on the second key lever 18 are brought into contact with each other in the rotational direction. A possible double unlocked portion 163 is provided.

  When the block lever 16 is in the double unlock position, the block portion 161 retracts out of the movement locus of the block portion 191 and moves the linkage lever 19 from the lock position to the unlock position and vice versa. In other words, when the operation mechanism is allowed to switch from the locked state to the unlocked state, and when the block lever 16 is in the double lock position, the block moves into the movement locus of the blocked portion 191 and the blocked portion By engaging 191, the movement of the linkage lever 19 from the locked position to the unlocked position is prevented.

  When the block lever 16 is in the double unlocked position, the double lock release portion 163 retreats out of the movement locus of the release arm portion 181 of the second key lever 18 as shown in FIGS. When the block lever 16 is in the double lock position, as shown in FIG. 8, the block lever 16 enters the movement track of the release arm portion 181 and is based on the rotation from the neutral position of the second key lever 18 to the unlocking direction. To contact the release arm 181. Thereby, the block lever 16 rotates from the double lock position to the double unlock position while reversing the second motor 15.

Next, the operation of the door latch device according to the above-described embodiment, particularly the operation in the one-motion operation and the double lock state will be described.
When the inside handle IH is opened in the locked state shown in FIG. 7 and the inside lever 24 is rotated in the open direction (clockwise in FIG. 7) from the standby position, as shown in FIG. When the portion 242 directly contacts the one-motion acting portion 202 of the first lock lever 20, the first lock lever 20 is forcibly rotated from the lock position to the unlock position. Immediately after this, the open action portion 243 of the inside lever 24 contacts the open action portion 253 of the outside lever 25, and as shown in FIG. 11, the first and second lock levers 20, 21 and the linkage lever 19 are moved. While moving to the unlock position, the outside lever 25 is rotated from the standby position in the opening direction. As a result, even if the linkage lever 19 and the first and second lock levers 20 and 21 are in the locked position, that is, in the locked state, the operation mechanism in the locked state is switched to the unlocked state by opening the inside handle IH. One-motion operation that can open the door becomes possible.

  When the operation switch is double-locked and the second motor 15 rotates in the double-lock direction, the block lever 16 rotates counterclockwise from the double-unlock position shown in FIG. 7 to the double-lock position shown in FIG. Rotate to stop.

  When the block lever 16 rotates to the double lock position, as shown in FIG. 8, the block portion 161 of the block lever 16 enters the movement locus of the blocked portion 191 of the linkage lever 19 in the lock position, and the linkage lever Thus, a double lock state in which the movement from the lock position of 19 to the unlock position is prevented.

  In the double-locked state, the linkage lever 19, the first and second lock levers 20, 21, the first and second lift levers 22, 23 are in the locked position. The door cannot be opened.

  In the double lock state shown in FIG. 8, the block lever 16 is in the block position, and the movement of the linkage lever 19 from the locked position to the unlocked position is prevented, and in synchronization with the linkage lever 19. The second lock lever 21, the first and second lift levers 22, 23 that move to the respective positions are also in a state in which the movement from the lock position to the unlock position is prevented.

  When the inside handle IH is opened in the double-locked state, the opening operation of the inside handle IH is transmitted to the inside lever 24 via the operating force transmission member 26, and the inside lever 24 is in the standby position shown in FIG. As shown in FIG. 9, the one-motion acting part 242 directly contacts the one-motion acting part 202 of the first lock lever 20 in the locked position. Only the lock lever 20 rotates from the locked position to the unlocked position (clockwise in FIG. 9) against the urging force of the torsion coil spring 30.

Therefore, in the double lock state, even if the inside handle IH is opened and the inside lever 24 rotates in the open direction, the linkage lever 19, the second lock lever 21, the first and second lift levers 22, 23 are not Since it remains in the locked position, the door cannot be opened, and the anti-theft property is improved.
Note that when the opening operation of the inside handle IH is released from the above state and the inside lever 24 returns to the standby position, the first lock lever 20 returns to the locked position again by the urging force of the torsion coil spring 30.

  When the lock knob LK is unlocked in the double lock state, the first lock lever 20 rotates from the lock position to the unlock position against the urging force of the torsion coil spring 30. However, since the linkage lever 19, the second lock lever 21, the first and second lift levers 22 and 23 are held in the locked position, the locked state is not switched to the unlocked state. When the unlocking operation of the lock knob LK is released, the lock knob LK and the first lock lever 17 return to the locked position again by the biasing force of the torsion coil spring 30. Therefore, in the double-locked state, even if the lock knob LK is unlocked, it is not switched to the unlocked state, so that the anti-theft property is improved.

  When the operation switch is double unlocked and the second motor 15 rotates in the double unlock direction, the block lever 16 rotates clockwise from the double lock position shown in FIG. 8 to the double unlock position. Then stop.

  When the block lever 16 rotates to the double unlock position, as shown in FIG. 7, the block portion 161 of the block lever 16 retracts out of the movement locus of the blocked portion 191 of the linkage lever 19 at the lock position, and the linkage lever 19 and the first and second lock levers 20, 21 and the first and second lift levers 22, 23 can be moved from the locked position to the unlocked position.

  In the double lock state shown in FIG. 8, when the key cylinder KC is unlocked, the first key lever 17 rotates from the neutral position in the unlocking direction (clockwise in FIG. 4). 2 is transmitted to the key lever 18. As a result, the second key lever 18 rotates counterclockwise from the neutral position shown in FIG. 8, the release arm portion 181 of the second key lever 18 abuts against the double-lock release portion 163 of the block lever 16, and the block lever 16 is rotated to the double unlock position while reversing the second motor 15, and is brought into contact with the contacted portion 192 to rotate the linkage lever 19 to the unlock position. As a result, the double lock state is released, and the first and second lock levers 20 and 21, the first and second lift levers 22 and 23 are moved to the unlock position to be in the unlock state.

  As described above, in the door latch device 1 according to the present invention, the first lock lever 20 can be moved from the lock position to the unlock position by the second lock lever 21 following the first lock lever 20. And a position where the torsion coil spring 30 for applying a biasing force to the second lock lever 21 is separated from the support shaft 114 pivotally supporting the first and second lock levers 20 and 21 in a direction perpendicular to the axial direction thereof, that is, A support shaft facing the direction of the second lock lever 21 provided on the outer side surface of the spring support portion 203 of the first lock lever 20 at a position protruding forward from the front lower end 211 of the lower portion of the second lock lever 21. 204, and the coil portion 303 of the torsion coil spring 30 is disposed so as not to overlap in the axial direction of the support shaft 114. Compared with a conventional door latch device in which a torsion coil spring is provided on a support shaft that pivotally supports the opposite surfaces of the first and second lock levers 20, 21, the dimensions of the first and second lock levers 20 and 21 in the direction of the support shaft 114 are larger. Can be small. As a result, the thickness of the operation unit 4 in the vehicle interior / exterior direction can be reduced, and the door latch device 1 can be downsized.

  Further, since the support shaft 204 is provided on the spring support portion 203 of the first lock lever 20 at a position away from the second lock lever 21, the first and second lock levers 20 and 21 are attached to the support shaft 114. Even after pivoting, the torsion coil spring 30 can be easily assembled to the support shaft 204.

  Although the embodiment of the present invention has been described above, the following various modifications and changes can be made to the present embodiment without departing from the gist of the present invention.

(I) The torsion coil spring 30 is wound around a support shaft provided on the second lock lever 21 side. At this time, the lower portion of the second lock lever 21 is elongated so as not to face the first lock lever 20, and the support shaft projects in the direction of the first lock lever 20 in the elongated portion. Should be provided.
(Ii) A spring that applies an urging force to the first lock lever 20 and the second lock lever 21 is replaced with a torsion coil spring 30, and a tension spring or the like is used.
(Iii) The operating force transmission member 27 is not connected to the first lock lever 20, and the lock knob LK is eliminated. In this case, the vehicle interior lock operation member is constituted by an operation switch and a vehicle interior opening operation handle.

DESCRIPTION OF SYMBOLS 1 Door latch apparatus 2 Engagement mechanism 3 Engagement unit 4 Operation unit 5 Body 6 Striker 7 Latch 8 Ratchet 9 Open lever 10 Back plate 11 Casing 12 Cover 13 1st motor (electric drive source)
14 Worm wheel 15 Second motor 16 Block lever (block member)
17 First Key Lever 18 Second Key Lever 19 Linking Lever 20 First Lock Lever 21 Second Lock Lever 22 First Lift Lever 23 Second Lift Lever 24 Inside Lever 25 Outside Lever 26 Operation Force Transmission Member 27 Operation Force Transmission Member 28 Lid Member 29 Holding spring 30 Torsion coil spring 31, 32 Worm 111-116 Support shaft 251 Operating end 252 Outer vehicle connecting part 141 First engagement protrusion 142 Second engagement protrusion 161 Block part 162 Sector gear 163 Double lock release part 181 Release arm part 191 Blocked part 192 Contacted part 193 Long hole 201 Connecting part 202 One-motion acting part 203 Spring support part 204 Support shaft 205 Locking protrusion 206 Locking piece 211 Front lower end 212 Locking protrusion 213 Actuating arm 214 first Projection 215 Second projection 216 First engagement arm 217 Second engagement arm 221 First long groove 222 Bearing hole 241 Connection portion 242 One-motion operation portion 243 Open operation portion 251 Operation end portion 252 External connection portion 253 Opened operation Part 301, 302 Foot piece 303 Coil part IH Inside handle (car interior opening operation handle)
KC Key cylinder LK Lock knob (Inside lock operation member)

Claims (2)

A first lock lever that is linked to the vehicle interior lock operation member of the door and is pivotally supported by a support shaft so as to be pivotable to a lock position and an unlock position based on an operation of the vehicle interior lock operation member;
A lock position that is pivotally supported by the support shaft and that is driven by an electric drive source and driven by the first lock lever so that the door cannot be opened by the vehicle exterior opening operation handle, and the door opening. A second lock lever that can be pivoted to an unlocked position,
Provided at a position spaced apart from the support shaft in a direction perpendicular to the axial direction thereof, so that the second lock lever can be driven from the lock position to the unlock position by following the first lock lever. A spring for applying a biasing force to the first lock lever and the second lock lever;
Based on the operation of the vehicle interior opening operation handle of the door, the first lock lever and the second lock lever are moved to the unlock position by contacting the first lock lever at the lock position, and the door Inside lever that can be opened,
By abutting on a double unlock position that allows the second lock lever to rotate from the lock position to the unlock position, and the second lock lever or a member that moves in synchronization with the second lock lever, A vehicular door latch device comprising: a block member movable to a double lock position that prevents rotation of the second lock lever from a lock position to an unlock position. The spring is a torsion coil spring, and the coil portion of the torsion coil spring is supported by being wound around a support shaft provided on one of the first lock lever and the second lock lever. The one foot of the torsion coil spring is used as one of the first lock lever and the second lock lever, and the other foot is used as the first lock lever and the second lock lever. Lock to either lock lever or the other lock lever,
2. The vehicle door latch device according to claim 1, wherein the coil portion of the torsion coil spring is disposed at a position that does not overlap with the other lock lever in the axial direction of the support shaft.

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