JP5678376B2 - Vehicle door latch device - Google Patents

Description

  The present invention relates to a vehicle door latch device including a latch that can be engaged with a striker.

  In the door latch device applied to the back door of the vehicle, as shown in FIG. 8, the base plate A fixed to the back door of the vehicle is formed with an entry groove A1 into which the striker B on the vehicle body side enters when the back door is closed. In addition, a latch C that can be engaged with the striker B and a ratchet D that prevents the latch C from rotating by engaging with the latch C are pivotally supported (see, for example, Patent Document 1).

  The latch C has an engagement groove C1 that engages with the striker B that has entered the entry groove A1 of the base plate A. In order to minimize the deformation of the arm portion C2 of the latch C where the striker B abuts when a large force is applied between the latch C and the striker B due to a vehicle collision or the like, as shown in FIG. The rear edge of the arm portion C2 that is in contact, that is, the inner edge C3 of the engagement groove C1, is the opening side of the striker entry groove A1 from the opening side (left side in FIG. 9) to the back side (right side in FIG. 9). It is inclined to (lower side in FIG. 9).

JP 2010-37781 A

  In the door latch device as described above, when the force F (see FIG. 9) acts on the striker B engaged with the latch C due to a vehicle collision or the like in the direction of the arrow, the striker B engages with the engagement groove C1 of the latch C. Are displaced toward the back side (right side in FIG. 9) of the engaging groove C along the inclined inner edge C3 and displaced toward the opening side (lower side in FIG. 9) of the entry groove A1. As described above, when the striker B is displaced toward the opening side of the entry groove A1, the fixing portion A2 of the base plate A fastened and fixed to the back door by the bolt and the point of action of the force (the point where the striker B contacts the latch C). The distance L between them becomes longer. As a result, the moment of force acting on the fixed portion A2 is increased, and the deformation of the fixed portion A2 and its surroundings is promoted.

  In view of the above problems, an object of the present invention is to provide a vehicle door latch device that can improve the strength by minimizing the deformation of a base plate when a large force is applied between the latch and the striker.

In order to solve the above-mentioned problem, the first invention is a base plate having a striker entry groove that is fixed to either a vehicle body or a door and into which the other striker can enter, and is pivotally supported by the base plate. A latch having an engaging groove that can be engaged with the striker that has entered the door, and a ratchet that engages with the latch and prevents rotation of the latch, and the base plate is formed in the engaging groove of the latch. In a vehicle door latch device in which only a fixed portion that is a predetermined distance away from the engaged striker in the approaching direction side of the striker is fixed to the vehicle body or the door, there is an engagement groove in the engagement groove. And a portion where the striker engaged with the latch can abut is moved from the opening side of the engagement groove toward the back side. An inclined portion inclined toward the opening side of the squid entry groove, successively in the direction of the end of the slope in the inclined portion, not inclined toward the opening side of the front Symbol striker entry groove, the striker of the striker No straight angle with respect to the entering direction of the grooves, and to form a ridge having the striker entry groove predetermined length in the width direction of the the inner portion continuous to the ridge, in the engagement groove the striker is engaged, while contact to the ridge moves from the inclined portion to the raised portion side, by also contacting the inner portion, the as predetermined distance increases the Displacement of the striker toward the opening side of the striker entry groove is prevented.

  In a second aspect based on the first aspect, the latch is formed by coating the surface of a metal plate with a synthetic resin, and the raised portion exposes the metal without being covered with the synthetic resin.

The present invention provides an engagement groove of a latch that does not incline toward the opening side of the striker entry groove at a portion where the striker can come into contact, but is perpendicular or inclined to the entry direction of the striker into the striker entry groove. When a force is applied between the latch and the striker, it is fixed to the door of the base plate when the force acts between the latch and the striker. By preventing the striker from being displaced such that the distance between the fixed portion and the fixed portion is increased, the deformation of the base plate with the fixed portion of the base plate as a fulcrum can be suppressed, and the strength can be improved.

It is a side view of the door latch device concerning the present invention. It is a top view of a door latch device at the time of an engagement state similarly. It is a top view of a door latch device at the time of a separation state similarly. It is an enlarged view of the arrow IV part in FIG. It is a cross-sectional view of a latch. FIG. 5 is an enlarged view of the same part as in FIG. 4, and is an explanatory view showing the displacement of the striker when a force acts between the latch and the striker. FIG. 5 is an enlarged view of the same portion as FIG. 4, and is an explanatory diagram for comparing the striker displacement between the present invention and the prior art. It is a top view of the door latch apparatus for demonstrating a prior art. It is an enlarged view of the arrow IX part in FIG. It is an enlarged view of the principal part (same part as FIG. 4) of 2nd Example concerning this invention. It is an enlarged view of the principal part (same part as FIG. 4) of 3rd Example concerning this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the left side in FIG. 1 and the lower side in FIGS. 2 and 3 are referred to as “front”, and the right side in FIG. 1 and the upper side in FIGS.

  A door latch device 1 according to this embodiment is applied to a back door (hereinafter referred to as a door) 11 pivotally supported at the rear of a vehicle body so as to be opened and closed in the vertical direction, and is a metal base plate 2 fixed to a lower panel of the door 11. And a striker 3 that is pivotally supported by the base plate 2 and fixed to the vehicle body 12 side, and a latch 4 that can be engaged and disengaged, and a metal ratchet 5 that is pivotally supported by the base plate 2 and can be engaged and disengaged by the latch 4.

  In the present embodiment, a configuration in which the door latch device 1 is provided in the door 11 and the striker 3 in the vehicle body 12 will be described. However, the present invention is not limited to this embodiment, and the door latch device 1 is installed in the vehicle body. 12 and the striker 3 may be provided on the door 11 respectively. Furthermore, the door is not limited to the back door 11 and may be a side door, a sliding door, or a trunk lid.

  The base plate 2 has a concave base portion 21 protruding from the lower panel of the back door 11 toward the vehicle body 12, and is bent substantially horizontally in the rear upper portion of the base portion 21. A pair of left and right flange portions 22 and 22 are fixed. At the center in the left-right direction of the base portion 21 of the base plate 2, a striker entry groove 23 is provided in which the front is opened and the rear (back side) is closed so that the striker 3 can enter from the front when the door 11 is closed. The left and right flange portions 22 and 22 are provided with female screw holes 24 and 24 into which the bolts 6 are screwed.

  As shown in FIG. 5, the latch 4 is formed by covering the surface of the metal plate 4A with a synthetic resin 4B that can be slightly elastically deformed. As shown in FIGS. An engaging portion 41 that is pivotally supported on the right side of the striker entry groove 23 on the flat support surface of the base portion 21 and that can be engaged with a claw portion 51 provided at the tip of the ratchet 5, and an engaging portion 41 An arm portion 42 provided on the front side (the side where the striker entry groove 23 opens), and an engagement groove 43 between the engagement portion 41 and the arm portion 42 and engageable with the striker 3 that has entered the striker entry groove 23. As the door 11 is closed, the door 11 is turned from the disengaged state shown in FIG. 3 to the engaged state shown in FIG.

  As shown in FIG. 2, when the latch 4 is in the engaged state, the engaging portion 41 is located behind the back end (rear end) of the striker entry groove 23, and the arm portion 42 is the striker. The front end portion of the base portion 21 extends over the left edge of the striker entrance groove 23 across the entrance groove 23.

As shown in FIGS. 2 and 4, when the striker 3 is engaged with the engagement groove 43 of the latch 4, the latch 4 is located at the front edge of the engagement groove 43 of the latch 4, that is, at the rear edge of the arm portion 42. As shown in FIGS. 4 and 5, the portion where the striker 3 engaged with the engaging groove 43 can come into contact with the rear side (left side in FIGS. 4 and 5) from the opening side (left side in FIGS. 4 and 5). 4 and 5 toward the opening side (lower side in FIGS. 4 and 5) of the striker entry groove 23, and particularly as shown in FIG. 2 is continuous with the end 421a in the inclining direction (in the diagonally lower right direction in FIGS. 2 and 4) and is located between the end 421a and the inner portion 43a of the engaging groove 43 toward the opening side of the striker entry groove 23. Entry into striker entry groove 23 of striker 3 without tilting At right angles to the direction, and a ridge 422 having a predetermined length to (horizontal direction in FIG. 4) the width direction of the striker entry groove 23 is formed. Here, the back part 43a is formed so that the front end and the end 421a of the back part 43a are in the same position in the front-rear direction (the approach direction of the striker 3). That is, when the striker S is displaced from the end 421a of the inclined portion 421 to the inner portion 43a, the striker S is not further displaced toward the opening side of the striker entry groove 23 by contacting the raised portion 422 and the inner portion 43a. It has become.

  The entire inclined portion 421 of the metal in the latch 4 is covered with the synthetic resin 4B, and the protruding portion 422 of the metal is covered with the synthetic resin 4B on the side closer to the inclined portion 421, that is, the left half is exposed with the metal. .

  The ratchet 5 is pivotally supported on the left side of the striker entry groove 23 in the base portion 21 by a ratchet shaft 8 facing upward and downward, and at the rear portion, when the latch 4 is in an engaged state as shown in FIG. A claw portion 51 is provided that engages with the four engaging portions 41 to prevent the latch 4 from rotating from the engaged state to the disengaged state.

  The female screw holes 24, 24 provided in the flange portions 22, 22 of the base plate 2 are positioned rearward from the striker 3 engaged with the engagement groove 43 of the latch 4, that is, at a distance L away from the striker 3 in the entry direction. Is provided.

  When the door 11 is closed, the striker 3 enters the striker entry groove 23 of the base plate 2 from the direction of the arrow shown in FIG. 3 and engages with the engagement groove 43 of the latch 4. As a result, the latch 4 rotates clockwise from the disengaged state shown in FIG. 3 to the engaged state shown in FIG. 2 against the urging force of the spring 9 wound around the latch shaft 7. . The ratchet 5 is rotated by the urging force of the spring 10 wound around the ratchet shaft 8, and the claw portion 51 engages with the engaging portion 41 of the latch 4, thereby moving the latch 4 from the engaged state to the disengaged state. Is prevented and the door 11 is restrained to the closed state.

When, for example, a force F forward diagonally to the right acts on the striker 3 meshed with the latch 4 due to a vehicle collision or the like, before the force F acts, as shown in FIG. The striker 3 that is in the center and is engaged with the engagement groove 43 of the latch 4 moves along the inclined portion 431 while deforming the synthetic resin 4B that covers the inner peripheral edge of the engagement groove 43 of the latch 4. As shown in FIG. 6, it is slightly displaced forward and diagonally to the right, and immediately contacts the metal raised portion 422 and also contacts the inner portion of the engaging groove 43. Thereby, the forward displacement of the striker 3 is prevented. At this time, since the raised portion 422 with which the striker 3 abuts is made of metal, the striker 3 can be reliably prevented from moving forward.

  When comparing the displacement of each striker 3 of the present embodiment and the prior art based on FIG. 1 and FIG. 7, in the present embodiment, since the raised portion 422 is formed on the right side of the inclined portion 421, the solid line The striker 3 shown is stopped at the position a in contact with the raised portion 422, whereas in the conventional technique, the inclined portion 421 is formed as far as the inner side of the engaging groove 43, so that the striker 3 indicated by a two-dot chain line is shown. Is displaced to a position b displaced further forward than the position a. As a result, the distance between the fixing portion of the flange portion 22 in the base plate 2 fastened and fixed to the door 11 by the bolt 6 and the force application point (the point where the striker 3 abuts the engagement groove 43 of the latch 4). L (see FIG. 2) is shorter in the present embodiment than in the prior art, the moment of force acting on the fixed portion is reduced, and deformation of the flange portion 22 of the base plate 2 with the fixed portion as a fulcrum is minimized. The strength can be improved.

  10 and 11 show the second and third embodiments of the present invention, respectively. In the second and third embodiments, the striker 3 that is in the front edge of the engagement groove 43 of the latch 4, that is, the rear edge of the arm portion 42 and is engaged with the engagement groove 43 of the latch 4 can contact. Since the other parts are the same as those in the above embodiment, the same parts are denoted by the same reference numerals as those in the above embodiment, and detailed description thereof is omitted.

  In the second embodiment, as shown in FIG. 10, the portion in the engaging groove 43 of the latch 4 where the striker 3 engaged with the latch 4 can come into contact is the same as in the above embodiment. An inclined portion 421, a first raised portion 423 continuous to the right side of the inclined portion 421 and perpendicular to the approach direction of the striker 3, and a rear side of the striker entry groove 23 continuous to the right side of the first raised portion 423 (see FIG. 10), that is, a second raised portion 424 inclined to the opposite side of the inclined portion 421 is formed. As a result, when a rightward force is applied to the striker 3 meshed with the latch 4 due to a vehicle collision or the like, the striker 3 engaged with the engagement groove 43 of the latch 4 is indicated by a two-dot chain line. It is displaced from the 3A position shown to the 3B position shown by the solid line, and immediately comes into contact with the second raised portion 424 where the metal is exposed, and also comes into contact with the inner portion of the engagement groove 43. Thereby, since the forward displacement of the striker 3 is prevented, the same or more operational effects as those of the above embodiment can be achieved.

  In the third embodiment, as shown in FIG. 11, the portion in the engagement groove 43 of the latch 4 where the striker 3 engaged with the latch 4 can come into contact is the same as in the above embodiment. An inclined portion 421 and a second raised portion 425 that continues to the right side of the inclined portion 421 and is inclined to the back side (upper side in FIG. 11) of the striker entry groove 23, that is, the opposite side of the inclined portion 421 are formed. As a result, when a rightward force is applied to the striker 3 meshed with the latch 4 due to a vehicle collision or the like, the striker 3 engaged with the engagement groove 43 of the latch 4 is indicated by a two-dot chain line. It is displaced from the 3A position shown to the 3B position shown by the solid line and immediately comes into contact with the second raised portion 425 where the metal is exposed, and also comes into contact with the inner part of the engagement groove 43. Thereby, since the forward displacement of the striker 3 is prevented, the same or more operational effects as those of the above embodiment can be achieved.

DESCRIPTION OF SYMBOLS 1 Door latch apparatus 2 Base plate 3 Striker 4 Latch 4A Metal plate 4B Synthetic resin 5 Ratchet 6 Bolt 7 Latch shaft 8 Ratchet shaft 9 Spring 10 Spring 11 Back door 12 Car body 21 Base part 22 Flange part 23 Strike entry groove 24 Female screw hole 41 Engagement Part 42 arm part 43 engaging groove 51 claw part 421 inclined part 422 raised part 423 first raised part 424, 425 second raised part

Claims (2)

A base plate that is fixed to either the vehicle body or the door and has a striker entry groove into which the other striker can enter, and an engagement groove that is pivotally supported by the base plate and engages with the striker that has entered the striker entry groove. And a ratchet that engages with the latch to prevent rotation of the latch, and the base plate enters the striker more than the striker engaged with the engagement groove of the latch. In the vehicle door latch device in which only a fixed portion that is a predetermined distance away in the direction side is fixed to the vehicle body or the door,
The portion of the latch that is in the engagement groove and on which the striker engaged with the latch can come into contact is formed on the opening side of the striker entry groove from the opening side of the engagement groove toward the back side. an inclined portion inclined toward, continuous in the direction of the end of the slope in the inclined portion, not inclined toward the opening side of the front Symbol striker entry groove, the approach direction to the striker entry groove of the striker a ridge having a straight corner without the, and a predetermined length in the width direction of the striker entry groove for, formed by the inner portion continuous to the ridge,
The striker engaged with the engagement groove, with contact to the ridge moves into the raised portion side from said inclined portion, by also contacting the inner portion, wherein the predetermined distance is A door latch device for a vehicle, wherein the striker is prevented from being displaced toward the opening side of the striker entry groove.   The latch is formed by coating a surface of a metal plate with a synthetic resin, the inclined portion is covered with the synthetic resin, and the raised portion exposes the metal without being covered with the synthetic resin. The vehicle door latch device according to claim 1.

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