JP2021134536A - Door latch device for automobile - Google Patents

Abstract

To allow a door latch device for an automobile to securely maintain the closed state of a door even when the direction of inertia acting on an inertia lever is reversed during a collision.SOLUTION: An inertia lever 13 is provided that can be rotated from the initial position to the blocked position against the energization force of a torsion spring 26 when an inertia force exceeding a set value is applied. The inertia lever 13, which is brought into contact with an open link 14 when the inertia lever moves from the initial position to the blocked position, causes the open link 14 to move from the unlocked position to the locked position, and also prevents the open link 14 from moving from the locked position to the unlocked position. The torsion spring 26 engages with the inertia lever 13 when the inertia lever 13 moves to the blocked position, thereby holding the inertia lever 13 in the blocked position.SELECTED DRAWING: Figure 9

Description

The present invention relates to an automobile door latch device, and more particularly to an automobile door latch device that maintains a closed state of a door even when a side collision accident or the like occurs.

Conventionally, as an invention capable of maintaining the closed state of the door when the door is impacted by a side collision accident or the like, there are, for example, those described in Cited Documents 1 and 2.

In the invention described in Cited Document 1, the inertial lever is pivotally supported by an open lever that rotates in conjunction with the operation of the outside handle provided on the outside of the vehicle of the door, and the inertia exceeds the set value due to an impact such as a side collision. When a force is applied, the inertial lever can swing from the first position that avoids contact with the housing to the second position that contacts the housing and restrains the open lever, thereby opening the door unexpectedly. It is intended to prevent.

The invention described in Cited Document 2 operates a latch mechanism having an operation receiving portion for disengaging the striker, an open lever that rotates in conjunction with the operation of the outside handle, and a rotational force of the open lever. An inertial lever (“transmission member” in Patent Document 2) that can swing to an unlock position that can be transmitted to the receiving portion and a lock position that cannot be transmitted, and an inertial lever that is urged from the lock position to the unlock position. On the other hand, when an inertial force exceeding the set value is applied to the inertial lever, the inertial lever is provided with a spring member that allows the inertial lever to move from the unlocked position to the locked position. When the spring member moves toward the lock position against the urging force of the spring member due to the action, the spring member locks to the regulating portion to regulate the urging of the inertial lever toward the unlocked position by the spring member. It is designed to prevent the door from opening unintentionally.

Japanese Patent No. 5948786 JP-A-2018-3305

In automobiles, airbags are installed in the passenger compartment to protect occupants when an impact acts on the vehicle body due to a side collision or the like. For this reason, when an impact acts on the vehicle body due to a side collision or the like, the impact is first applied to the door on the impacted side in the inward direction (direction from the outside of the vehicle to the inside of the vehicle), and then the impact is applied. When the airbag is activated, an impact acts in the outward direction (the direction from the inside of the vehicle to the outside of the vehicle). As a result, various movable elements of the automobile door latch device provided in the door are first subjected to an inertial force in the outward direction and then an inertial force in the inward direction.

As described above, when the inertial direction acting on various movable elements is reversed from the outward direction to the inward direction, in the invention described in Patent Document 1, the inertial lever moves from the first position to the second position at the time of a side collision. Nevertheless, there is a problem that the open lever cannot be reliably restrained because it immediately returns to the first position.

Further, also in the invention described in Patent Document 2, since the spring member is locked to the regulating portion to regulate the urging of the inertial lever from the locked position to the unlocked position, it acts on the inertial lever. When the inertial direction is reversed, the spring member may come off the regulation portion and the inertial lever may move to the unlocked position.

In view of the above problems, it is an object of the present invention to provide an automobile door latch device capable of reliably maintaining a closed state of a door even when the inertial direction acting on the inertial lever is reversed at the time of a collision. And.

In order to solve the above problems, the present invention includes an engagement mechanism capable of holding the door in a closed position, an outside lever that can move in the release direction in conjunction with an opening operation of an operation handle arranged on the door, and the above. Attached when an inertial force exceeding the set value acts on the open link that can move to the unlock position that can release the engagement of the meshing mechanism and the lock position that cannot be released based on the movement of the outside lever in the release direction. An inertial lever that can move from the initial position to the block position against the urging force of the urging member is provided, and when the inertial lever moves from the initial position to the block position, the inertial lever comes into contact with the open link. The open link is moved from the unlocked position to the locked position and the movement of the open link from the locked position to the unlocked position is blocked, and the urging member has the inertia when the inertial lever moves to the block position. By engaging with the lever, the inertial lever is held at the block position.

Preferably, the urging member is a torsion spring in which one arm portion is hooked on the inertial lever and the other arm portion is hooked on a base member supporting the inertial lever.

Preferably, the torsion spring holds the inertial lever in the block position by engaging the other arm portion with the inertial lever when the inertial lever moves to the block position.

Preferably, by moving the outside lever in the release direction, the other arm portion of the torsion spring and the inertial lever are disengaged from each other, and the initial position from the block position of the inertial lever is released. Allows you to move to.

Preferably, the open link is in the unlocked position and the inertial lever moves from the initial position to the block position and abuts on the inertial lever to resist the urging force of the spring acting on the open lever. Then move from the unlock position to the lock position.

Preferably, the open link moves from the locked position to the unlocked position by the urging force of the spring as the inertial lever returns from the block position to the initial position.

Preferably, the inertial lever is coaxially supported by the outside lever and can rotate independently of the outside lever.

According to the present invention, when the open link is in the unlock position and the inertial lever moves from the initial position to the block position, the open link is moved from the unlock position to the lock position to unlock from the open link lock position. By blocking the movement of the inertial lever from the block position to the initial position as well as preventing the movement to the position, even if the inertial direction acting on the inertial lever is reversed in the event of a collision or the like, the open link Since the movement from the locked position to the unlocked position and the movement of the inertial lever from the block position to the initial position can be prevented, the closed state of the door can be reliably maintained.

It is a perspective view of the door latch device for automobiles which concerns on this invention. It is an exploded perspective view of the door latch device for automobiles. It is a side view seen from the inside of a car door latch device for a car. It is a front view of the main part of the door latch device for automobiles. It is a side view of a main part seen from the inside of a car when the lock mechanism is in an unlocked state. It is a side view of a main part seen from the inside of a car when the lock mechanism is in a locked state. It is a front view of the main part in the initial stage when an inertial force acts on a door latch device for an automobile. It is a side view of the main part seen from the inside of a car at the initial stage when an inertial force acts on a door latch device for a car. It is a front view of the main part in the final stage when an inertial force acts on an automobile door latch device. It is a side view of the main part seen from the inside of a car at the final stage when an inertial force acts on a door latch device for a car. It is a front view of the main part in the state where the outside lever is released and operated after the inertial force is applied to the door latch device for automobiles.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an automobile door latch device 1, FIG. 2 is an exploded perspective view of the automobile door latch device 1, and FIG. 3 is a side view of the automobile door latch device 1. Note that FIG. 3 shows a state in which the side cover 71 is removed in order to clarify the internal structure of the automobile door latch device 2.

The automobile door latch device 1 closes the door by engaging with a base member 2 mounted in a door that is openably and closably supported on the side surface of the vehicle body and a striker (not shown) that is assembled to the base member 2 and fixed to the vehicle body. It includes a meshing mechanism 3 that can be held in a state and various movable elements described later that are assembled to the base member 2.

The base member 2 is fixed in the door by bolts (not shown), and has a box-shaped synthetic resin body 4 having an open rear surface and a metal body 4 which closes the opening of the body 4 and is fixed in the door together with the body 4. Cover plate 5, metal back plate 6 fixed to the front side of the body 4, casing 7 made of synthetic resin having an L-shape in plan view, and a side cover that closes the side surface of the casing 7 facing the inside of the vehicle. Includes 71 and. The upper parts of the casing 7 and the side cover 71 are covered with the top cover 72 in order to prevent rainwater from entering the casing 7.

The meshing mechanism 3 is pivotally supported by a ratchet shaft 8 in the front-rear direction in an accommodation space formed between the body 4 and the cover plate 5, and meshes with a striker (not shown) on the vehicle body side when the door is closed, and the body 4 The accommodation space between the cover plates 5 includes a ratchet 11 which is pivotally supported by a ratchet shaft 10 in the front-rear direction and can prevent the latch 9 from rotating in the open direction by engaging with the outer peripheral edge of the latch 9 when the door is closed. .. The latch 9 is urged in the open direction by a spring (not shown), and the ratchet 11 is urged in an engaging direction that engages with the outer peripheral edge of the latch 9 by a spring (not shown).

When the door is closed, the latch 9 engages with the striker that enters the striker entry groove 4a of the body 4 from the inside of the vehicle, and rotates from the open position to the closed position. The ratchet 11 keeps the door D in the closed state by engaging with the outer peripheral edge of the latch 9 that has rotated to the closed position and preventing the latch 9 from rotating in the open direction. Since the configuration and operation of the meshing mechanism 3 are the same as those of the prior art, detailed description thereof will be omitted.

The various movable elements assembled to the base member 2 are an outside lever 12 pivotally supported between the casing 7 and the back plate 6 by a rear-facing first pivot 7a provided on the casing 7, and the outside lever 12 When an inertial force equal to or greater than a predetermined value acts due to a side collision or the like, the torsion spring 26 is pivotally supported on the same axis as the urging member, and the torsion spring 26 forms a urging member. A second pivotally supported by a movable inertial lever 13, an open link 14 arranged in the accommodation space between the casing 7 and the side cover 71, and a second pivot 7b provided on the casing 7 and protruding inward of the vehicle. A lock lever 15 and a second lock lever 16 and an inside lever 17 pivotally supported by a third pivot 7c provided on the casing 7 are included.

Further, the casing 7 is integrated with a first key lever 18 which is pivotally supported under the casing 7 and is connected to a key cylinder (not shown) provided on the outside of the vehicle via a connecting rod (not shown). A second key lever 19 that can rotate in the same direction, a motor 20 that can rotate forward and reverse by operating a portable switch or an operation switch provided in the vehicle, and a fourth pivot 7d provided in the casing 7 that protrudes in the vehicle interior direction. A drive gear 21 that is pivotally supported and can rotate forward and reverse by driving the motor 20 is provided.

The open link 14, the first lock lever 15, and the second lock lever 16 constitute a lock mechanism capable of switching between a locked state and an unlocked state. The locked state of the lock mechanism means that the open link 14, the first lock lever 15, and the second lock lever 16 are all in the unlock positions described later, and the outside handle OH forming the operation handle provided on the outside of the door. And the state where the door can be opened by the release operation of the outside lever 12 based on the opening operation of the inside handle IH provided on the inside of the door, and the locked state is the open link 14, the first lock lever 15 and This refers to a state in which all of the second lock levers 16 are in the lock positions described later, and even if the outside lever 12 is released, the door cannot be opened.

The outside lever 12 is pivotally supported by the first pivot 7a and is urged in the initial position direction by the urging force of the spring 22 to abut the stopper portion 7e provided on the casing 7 at the initial position shown in FIG. Is held in.

The vehicle outer connecting portion 12a provided at the vehicle outer end of the outside lever 12 is connected to the outside handle OH via a connecting rod 27 (see FIG. 4) in the vertical direction. As a result, the opening operation of the outside handle OH is transmitted to the vehicle outer connecting portion 12a of the outside lever 12 via the connecting rod 27, and the outside lever 12 resists the urging force of the spring 22 as shown in FIG. It rotates a predetermined angle from the indicated initial position in the release direction (clockwise direction).

The vehicle inside connecting portion 12b provided at the vehicle inside end of the outside lever 12 is inserted into the connecting hole 14a provided at the bottom of the open link 14. As a result, the rotation of the outside lever 12 in the release direction is converted into a linear motion in the vertical direction and transmitted to the open link 14.

As shown in FIG. 3, the inside lever 17 is an operation handle that is pivotally supported by the third pivot 7c of the casing 7 and that the connecting portion 17a provided at the lower end is provided inside the door by the Bowden cable 28. By being connected to the inside handle IH, it rotates clockwise from the initial position shown in FIG. 3 around the third pivot 7c based on the opening operation of the inside handle IH. The clockwise rotation of the inside lever 16 is transmitted to the outside lever 12 when the bent portion 17b provided on the inside lever 17 abuts on the abutted portion 12c provided on the outside lever 12 from below. .. As a result, the outside lever 12 rotates in the release direction based on the opening operation of the inside handle IH.

The first lock lever 15 is pivotally supported on the inner surface of the casing 7 by the second pivot 7b of the casing 7, and the connecting portion 15a provided at the lower end is provided inside the door via a Bowden cable (not shown). It is connected to a lock knob (not shown), and a connecting protrusion 15b provided at the bottom is connected to a long hole 19a provided in the second key lever 19 via a connecting arm 23.

Further, on the outer circumference of the arc portion 15c provided on the front portion of the first lock lever 15, when the drive gear 21 is rotated by the drive of the motor 20, a plurality of protrusions 21a provided on the drive gear 21 (see FIG. 3). An engaging recess 15d is provided in which any one of the protrusions 21a can engage with the first lock lever 15 in the rotation direction. As a result, the first lock lever 15 is set at a predetermined angle counterclockwise from the unlock position shown in FIGS. It moves to the rotated lock position shown in FIG. 6 and vice versa. The unlocked position and the locked position of the first lock lever 15 are elastically held by the urging force of the holding spring 24 supported on the inner surface of the casing 7. When the first lock lever 15 is in the unlocked position, it comes into contact with a stopper portion (not shown) provided on the casing 7 from the clockwise side, and when it is in the locked position, it is provided on the casing 7. By contacting the other stoppers (not shown) from the counterclockwise side, the stoppers are held at the respective positions.

The holding spring 24 is a torsion spring, and the coil portion 24a is supported by the support portion 7f provided on the casing 7, and the columnar protrusion provided on the first lock lever 15 between the arm portions 24b and 24c. By sandwiching the 15e, when the first lock lever 15 is in the unlocked position, the first lock lever 15 is given a clockwise urging force to be held in the unlocked position, and the first lock lever 15 is held. When in the locked position, a counterclockwise urging force for holding the first lock lever 15 in the locked position is applied to the first lock lever 15.

The second lock lever 16 is rotatably pivotally supported coaxially with the first lock lever 15, and is first driven by the urging force of the spring 25 acting between the first lock lever 15 and the second lock lever 16. In the state of being urged in the clockwise direction (unlocking direction) with respect to the lock lever 15, as shown in FIGS. It is held in the indicated normal position. Therefore, during normal operation, the second lock lever 16 also follows the movement of the first lock lever 15 from the unlock position to the lock position and vice versa, and the second lock lever 16 also moves from the unlock position to the lock position and vice versa. Move to.

The spring 25 is arranged around the second pivot 7b, and one arm portion is hooked on the first lock lever 15 and the other arm portion is hooked on the second lock lever 16. The second lock lever 16 is given a clockwise urging force to the 15.

The urging force of the spring 25 acting on the first lock lever 15 and the second lock lever 16 is set to be smaller than the urging force of the holding spring 24 that holds the first lock lever 15 in the locked position and the unlocked position. Will be done.

The upper part of the second lock lever 16 is opened by engaging the connecting protrusion 16a provided on the upper part with the elongated hole 14b in the vertical direction provided in the open link 14 so as to be slidable in the vertical direction. The links 14 are movably connected in the vertical direction.

The open link 14 is connected to the outside lever 12 by inserting the vehicle inside connecting portion 12b of the outside lever 12 into the connecting hole 14a provided at the lower part, and the second lock is formed in the elongated hole 14b facing in the vertical direction. The connecting protrusion 16a of the lever 16 is slidably engaged in the vertical direction to be connected to the second lock lever 16. As a result, as shown in FIGS. 3 and 5, when the second lock lever 16 is in the unlocked position, the open link 14 is held in the unlocked position in a posture in which the longitudinal direction faces substantially straight upward. As shown in 6, when the second lock lever 16 is in the locked position, the upper portion is held in the locked position in a posture of facing diagonally forward and upward.

The open link 14 is in a position where it can contact the unlocked arm portion 11a provided on the ratchet 11 from below when it is in the unlocked position and cannot contact the released arm portion 11a when it is in the locked position. A displaced release portion 14c and a blocked portion 14d located near the lower side of the release portion 14c and projecting rearward in a mountain shape are provided.

When the first and second lock levers 15 and 16 rotate from the unlock position to the lock position, the connecting protrusion 16a of the second lock lever 16 comes into contact with the front edge of the elongated hole 14b of the open link 14. As a result, the open link 14 also rotates around the vehicle inside connecting portion 12b of the outside lever 12 (around the rotation axis orthogonal to the rotation axis direction of the outside lever 12 and the inertial lever 13), and is unlocked. Move from to the lock position. Further, when the first lock levers 15 and 16 rotate from the locked position to the unlocked position, the connecting protrusion 16a of the second lock lever 16 comes into contact with the trailing edge of the elongated hole 14b of the open link 14. , The open lever 14 also rotates around the vehicle inner connecting portion 12b of the outside lever 12 and moves from the locked position to the unlocked position.

With the above configuration, as shown in FIG. 5, when the outside lever 12 is rotated from the initial position to the release direction by the opening operation of the outside handle OH or the inside handle IH when the lock mechanism is in the unlocked state, the open link The 14 goes straight upward from the unlocked position, and the release portion 14c of the open link 14 comes into contact with the released arm portion 11a of the ratchet 11 from below, thereby rotating the ratchet 11 in the release direction. As a result, the engagement relationship between the ratchet 11 and the latch 9 is released, and the door D can be opened.

As shown in FIG. 6, when the lock mechanism is in the locked state, when the outside lever 12 rotates in the release direction based on the opening operation of the outside handle OH or the inside handle IH, the open link 14 becomes Although it moves diagonally upward from the locked position, the ratchet 11 cannot be rotated in the release direction because the release portion 14c does not abut against the released arm portion 11a of the ratchet 11. Therefore, when the lock mechanism is in the locked state, the engagement relationship between the ratchet 11 and the latch 9 is maintained, and the door D cannot be opened.

The inertial lever 13 is pivotally supported by a first pivot 7a coaxial with the outside lever 12 so as to be rotatable by a predetermined angle independently of the outside lever 12, and is counterclockwise in FIG. 4 due to the urging force of the torsion spring 26. It is held at the initial position shown in FIG. 4 in contact with a stopper (not shown) provided on the casing 7 by being urged to the position, and an inertial force exceeding the set value is applied in the outward direction (clockwise in FIG. When acting in the outward direction), it rotates from the initial position in the block direction (clockwise in FIG. 4) against the urging force of the torsion spring 26.

The inertial lever 13 has a counter weight 13a provided on the upper portion away from the center of rotation (first pivot 7a) and an end portion facing the inside of the vehicle away from the center of rotation on the blocked portion 14d of the open link 14. The block portion 13b that can be brought into contact, the hooked portion 13c to which one arm portion 26a of the torsion spring 26 is hooked, and the other arm portion 26b of the torsion spring 26 can be engaged with each other in the rotation direction of the inertial lever 13. A hook portion 13d is provided.

The inertial lever 13 is held and set at the initial position shown in FIG. 4 by being urged counterclockwise in FIG. 4 by the urging force of the torsion spring 26 and abutting against a stopper (not shown) provided on the back plate 6. When an inertial force exceeding the value acts in the outward direction (direction from the inside of the vehicle to the outside of the vehicle), the counter weight 26b acts in the block direction (clockwise) against the urging force of the torsion spring 26 from the initial position. It rotates to the block position shown in FIG. 9 which is rotated by a predetermined angle in the direction).

The block portion 13b of the inertial lever 13 is in a position that does not block the movement of the open link 14 from the locked position to the unlocked position when the inertial lever 13 is in the initial position, and the inertial lever 13 is moved from the initial position to the block position. In the process of moving, the open link 14 in the unlocked position is forcibly moved to the locked position by contacting the blocked portion 14d of the open link 14 from below, and the inertial lever 13 is in the state of being moved to the block position. Enters the movement locus of the blocked portion 14d of the open link 14 and prevents the open link 14 from moving from the locked position to the unlocked position.

As shown in FIG. 4, in the torsion spring 26, the coil portion 26c is supported by the support portion 7g provided on the casing 7, and one arm portion 26a is hooked on the hooked portion 13c of the inertial lever 13. The other arm portion 26b bent in a crank shape abuts on the lower portion 6a of the back plate 6 to give an urging force in the counterclockwise direction to the inertial lever 13. The portion of the torsion spring 26 on which the other arm portion 26b is engaged is not limited to the back plate 6, and the body 4 or the casing 7 may be used instead of the back plate 6.

The other arm portion 26b of the torsion spring 26 is on the rotation locus of the hook portion 13e of the inertial lever 13 when the inertial lever 13 is in or near the initial position and is in contact with the lower portion 6a of the back plate 6. When the inertial lever 13 rotates by a predetermined angle from the initial position in the block direction, the inertial lever 13 slides over the inclined portion 13e provided in front of the hook portion 13d in the inertial lever 13 as shown by the solid line in FIG. By engaging with the hook portion 13d, the inertial lever 13 is prevented from returning to the initial position and held at the block position.

When the outside lever 12 rotates in the release direction (clockwise in FIG. 9) based on the opening operation of the outside handle OH while the inertial lever 13 is held at the block position, it is shown in FIG. As described above, the lower edge portion 12d of the outside lever 12 abuts on the other arm portion 26b of the torsion spring 26 from above, and the arm portion 26b is pushed down to remove the arm portion 26b from the hook portion 13d. can. As a result, the inertial lever 13 enables the torsion spring 26 to return from the block position to the initial position by the urging force of one arm portion 26a.

Next, based on FIGS. 4 to 11, the operation of the automobile door latch device 1 according to the present embodiment, particularly the case where an impact acts on the automobile door latch device 1 due to a side collision or the like will be described.

In the normal state, as shown in FIG. 4, the inertial lever 13 is held in the initial position by the urging force of the torsion spring 26. When the inertial lever 13 is in the initial position, as shown in FIGS. 4 to 6, the block portion 13b retracts out of the movement locus of the blocked portion 14d of the open link 14 and is retracted from the lock position of the open link 14. It is in a position that does not block the movement to the unlock position.

For example, as shown in FIGS. 4 and 5, it is assumed that a side collision accident or the like occurs while the vehicle is running or the vehicle is stopped when the lock mechanism is in the unlocked state. In this case, since an impact acts on the door on the side affected by the collision from the outside of the vehicle to the inside of the vehicle, the reaction to the door latch device 1 for automobiles is the outward direction (right in FIG. 4). Inertial force in the direction) acts.

When an inertial force in the outward direction acts on the door latch device 1 for automobiles, the inertial lever 13 is centered on the first pivot 7a against the urging force of the spring 26 by the counterweight 13a provided at the upper end portion. It rotates in the block direction (clockwise) from the initial position.

When the inertial lever 13 rotates in the block direction, the upper end of the block portion 13b first comes into contact with the blocked portion 14d of the open link 14 from below, as shown in FIGS. 7 and 8, in the initial stage. As a result, the open link 14 in the unlocked position is slightly forcibly rotated in the locking direction around the vehicle inner connecting portion 12b of the outside lever 12. At the same time, the other arm portion 26b of the torsion spring 26 rides on the inclined portion 13e provided in front of the hook portion 13d, and is twisted in the disengagement direction (clockwise in FIG. 7). In this case, as shown in FIG. 8, the open link 14 and the second lock lever 16 move in the locking direction, but the first lock lever 15 stops at the unlocked position due to the holding force of the holding spring 24. Maintain the state.

Further, the rotation of the inertial lever 13 in the block direction progresses, and as shown in FIGS. 9 and 10, when the inertial lever 13 rotates by a predetermined angle and rotates to the position indicated by the chain double-dashed line, the inertial lever 13 By completely contacting the blocked portion 14d of the open link 14, the block portion 13b forcibly moves the open link 14 to the locked position and enters the movement locus of the blocked portion 14d to open. Prevents the link 14 and the second lock lever 16 from moving to the unlocked position. On the other hand, the other arm portion 26b of the torsion spring 26 gets over the inclined portion 13e of the inertial lever 13 and is displaced to a position where it can be engaged with the hook portion 13d.

After that, when the inertial force disappears, as shown by the solid line in FIG. 9, the inertial lever 13 is slightly returned counterclockwise by the urging force of one arm portion 26a of the torsion spring 26, and the hook portion 13d is torsioned. The spring 26 is held at the block position by abutting against the other arm portion 26 from the counterclockwise side.

When the inertial lever 13 is held at the block position, the block portion 13b enters the movement locus of the blocked portion 14d at the open link 14 to prevent the open lever 14 from moving from the locked position to the unlocked position. do.

The urging force of the spring 25 acting between the first lock lever 15 and the second lock lever 16 is set to be smaller than the urging force of the spring 24 that holds the first lock lever 15 in the unlocked position. Therefore, even when the open link 14 is forcibly moved from the unlocked position to the locked position by the rotation of the inertial lever 13 in the block direction, the open link 14 and the second lock lever 16 still have the spring 25. Although it moves to the locked position against the urging force, the first lock lever 15 is held in the unlocked position by the urging force of the spring 24.

After that, when the airbag (not shown) installed in the vehicle interior is activated by the impact of the side collision, the impact in the direction outside the vehicle acts on the door on the side of the collision. An inertial force in the vehicle interior direction, that is, a force for returning to the initial position acts on the inertial lever 13.

However, in the present embodiment, the hook portion 13d of the inertial lever 13 is engaged with the other arm portion 26b of the torsion spring 26 to prevent the inertial lever 13 from returning to the initial position, so that the inertial lever 13 is prevented from returning to the initial position. The inertial lever 13 does not return to the initial position even if the direction of the inertial force acting on the force is reversed. Therefore, no matter what direction a force acts on the open link 14 forced to move to the lock position, the lock position of the open link 14 is surely maintained, so that the closed state of the door can be surely maintained. ..

After that, when it becomes necessary to open the door, the inertial lever 13 is returned to the initial position and the open link 14 and the second lock lever 16 are unlocked by the first opening operation of the outside handle OH or the inside handle IH. The door can be opened by returning to the position and opening the outside handle OH or the inside handle IH for the second time.

Specifically, as shown in FIGS. 9 and 10, when the outside lever 12 rotates in the release direction based on the first opening operation of the outside handle OH while the inertial lever 13 is held at the block position. As shown in FIG. 11, the lower edge portion 12d of the outside lever 12 abuts on the other arm portion 26b of the torsion spring 26 from above, so that the other arm portion 26b is brought into contact with the hook portion 13d of the inertial lever 13. Can be removed from. As a result, the inertial lever 13 returns to the initial position by the urging force of one arm portion 26a of the torsion spring 26.

When the inertial lever 13 returns to the initial position, the block portion 13b retracts out of the movement locus of the blocked portion 14d of the open link 14, so that the open link 14 and the second lock lever 16 are unlocked by the urging force of the spring 26. After returning to the position, the lock mechanism is unlocked.

Subsequently, in the second opening operation of the outside handle OH or the inside handle IH, the door D can be opened by rotating the outside lever 12 in the release direction.

When the lock mechanism is in the locked state and an impact acts on the door, the inertial lever 13 rotates in the block direction from the initial position, but the block portion 13b is the blocked portion of the open link 14. Without abutting against 14d from below, it enters the movement restriction of the blocked portion 14d and prevents the open link 14 from moving from the locked position to the unlocked position.

1 Automotive door latch device 2 Base member 3 Mating mechanism 4 Body 4a Striker entry groove 5 Cover plate 6 Back plate 6a Lower part 7 Casing 7a 1st pivot 7b 2nd pivot 7c 3rd pivot 7d 4th pivot 7e Stopper 7f Support 7g Support part 71 Side cover 72 Top cover 8 Latch shaft 9 Latch 10 Ratchet shaft 11 Ratchet 11a Unreleased arm part 12 Outside lever 12a Car outside connection part 12b Car inside connection part 12c Contacted part 12d Lower edge part 13 Inertial lever 13a Counter weight 13b Block part 13c Hook part 13d Hook part 13e Inclined part 14 Open link 14a Connecting hole 14b Long hole 14c Release part 14d Blocked part 15 First lock lever 15a Connecting part 15b Connecting protrusion 15c Arc part 15d Engagement Recess 15e Protrusion 15f Stopper 16 2nd lock lever 16a Connecting protrusion 17 Inside lever 17a Connecting 17b Bent 18 1st key lever 19 2nd key lever 19a Long hole 20 Motor 21 Drive gear 21a Protruding 22 Spring 23 Connecting arm 24 Holding spring 24a Coil part 24b, 24c Arm part 25 Spring 26 Torsion spring (biasing member)
26a One arm part 26b The other arm part 26c Coil part 27 Connecting rod 28 Bowden cable OH Outside handle (operation handle)
IH inside handle (operation handle)

Claims (7)

With a meshing mechanism that can hold the door in the closed position,
An outside lever that can move in the release direction in conjunction with the opening operation of the operation handle arranged on the door,
An open link that can move to an unlock position that can disengage the meshing mechanism and a lock position that cannot be disengaged based on the movement of the outside lever in the release direction, and
When an inertial force exceeding the set value is applied, an inertial lever that can move from the initial position to the block position against the urging force of the urging member is provided.
When the inertial lever moves from the initial position to the block position, the inertial lever moves the open link from the unlocked position to the locked position by abutting on the open link, and moves from the locked position to the unlocked position of the open link. Block the movement,
The urging member is an automobile door latch device, characterized in that when the inertial lever moves to a block position, the inertial lever is held at the block position by engaging with the inertial lever. The first aspect of the present invention, wherein the urging member is a torsion spring in which one arm portion is hooked on the inertial lever and the other arm portion is hooked on a base member supporting the inertial lever. Door latch device for automobiles. 2. The torsion spring according to claim 2, wherein when the inertial lever moves to the block position, the other arm portion engages with the inertial lever to hold the inertial lever at the block position. Door latch device for automobiles. By moving the outside lever in the release direction, the other arm portion of the torsion spring and the inertial lever are disengaged from each other, and the inertial lever moves from the block position to the initial position. 3. The automobile door latch device according to claim 3. The open link is in the unlocked position, and when the inertial lever moves from the initial position to the block position and comes into contact with the inertial lever, it is unlocked against the urging force of the spring acting on the open lever. The automobile door latch device according to any one of claims 1 to 4, wherein the door latch device moves from the lock position to the lock position. The automobile door latch device according to claim 5, wherein the open link moves from the locked position to the unlocked position by the urging force of the spring when the inertial lever returns from the block position to the initial position. The automobile door latch device according to any one of claims 1 to 6, wherein the inertial lever is coaxially supported by the outside lever and can rotate independently of the outside lever. ..

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