JP2013194454A - Door latch device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable miniaturization of a door latch device for a vehicle.SOLUTION: A ratchet 8 comprises: a resin body 800 having a bearing cylinder part 801 in which a ratchet shaft 7 is inserted so as to be rotated relative to each other; and a metallic ratchet body 80 having a stopping part 81 and fitted and fixed to the resin body 800 from the axial direction of the ratchet shaft 7. The ratchet body 80 has a shaft hole 82 with which the bearing cylinder part 801 of the resin body 800 is brought into engagement from the axial direction and of which side facing a rotational locus L of tips of engaging parts 62, 63 of a ratch 6 is an opening 821. An outside peripheral surface 8011 on a side facing the rotational locus L among the peripheral surface of the bearing cylinder part 801 is exposed from the opening 821 of the shaft hole 82 in the ratchet body 80 toward the rotational locus L.

Description

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

  A vehicle door latch device pivotally supports a housing fixed to a door, a latch that engages with a striker on the vehicle body side when the door is closed, and a ratchet that engages with the latch and prevents rotation in the opening direction. It is composed by doing. The ratchet is composed of a metal ratchet main body and a resin portion integrated with the ratchet main body by insert molding in order to reduce weight and reduce operating noise. Then, a notch having a width smaller than the outer diameter of the ratchet shaft for pivotally supporting the ratchet is formed in the shaft support portion of the ratchet body, and the ratchet shaft is inserted by filling the notch with a resin portion. By forming the shaft hole, the ratchet can secure a strength for preventing the latch from swinging, and the distance between the ratchet shaft and the latch shaft can be reduced as much as possible (for example, patent document). 1 and 2).

JP 2011-17172 A Japanese Utility Model Publication No. 3-54571

  However, in order to cope with the reduction in the thickness of the door in accordance with the recent reduction in weight of vehicles, it is actually desired that the door latch device be further reduced in size. However, in the conventional door latch device as described above, the ratchet Since the resin part is insert-molded in the metal ratchet body, the cost is increased, and the notch is filled with the resin part to form the shaft hole, so the ratchet shaft and latch shaft Since a large thickness of the resin portion filled in the notch is required between them, there is a limit to downsizing by further reducing the distance between the ratchet shaft and the latch shaft.

  In view of the above problems, an object of the present invention is to provide a vehicle door latch device that can be reduced in cost with a simple configuration.

  In order to solve the above technical problem, the technical means of the present invention includes a housing, a latch pivotally supported on the housing by a latch shaft and engageable with a striker, and pivotally supported on the housing by a ratchet shaft. In the vehicle door latch device comprising a ratchet that prevents the latch engaged with the striker from rotating in the open direction by engaging the blocking portion with the engaging portion, the ratchet shaft is relative to the ratchet. A resin body having a bearing cylinder portion rotatably inserted therein, and a metal ratchet body having the blocking portion and fitted and fixed to the resin body from the axial direction of the ratchet shaft, The ratchet body has a side facing the rotation locus of the tip of the engaging portion of the latch, and the bearing tube portion of the resin body is fitted from the axial direction. The outer circumferential surface of the circumferential surface of the bearing tube portion facing the rotation locus is directed from the opening of the shaft hole in the ratchet body toward the rotation locus. It is exposed.

  Preferably, the resin body further protrudes in the axial direction so as to face the inner circumferential surface opposite to the outer circumferential surface of the circumferential surface of the bearing tube portion with a predetermined distance therebetween. The ratchet body is fitted and fixed between the inner circumferential surface of the bearing tube portion and the wall portion.

  Further preferably, the resin body has a plurality of claws that can be engaged with the ratchet body in the axial direction.

  Further preferably, the width of the opening of the shaft hole in the ratchet main body is wider than the diameter of the ratchet shaft and smaller than the outer diameter of the bearing tube portion.

  According to the present invention, since the ratchet has a configuration in which a metal latch body is fitted and fixed to the resin body from the axial direction, cost can be reduced. Furthermore, by exposing the outer circumferential surface of the bearing tube portion in the resin body toward the turning locus from the opening of the shaft hole in the ratchet body, only the thickness of the bearing tube portion is between the latch shaft and the ratchet shaft. Therefore, the distance between the latch shaft and the ratchet shaft can be made narrower than that of the prior art, and the size can be further reduced.

It is a perspective view of the door latch apparatus of the Example concerning this invention. It is a disassembled perspective view which similarly shows the internal structure of a door latch apparatus. Similarly, it is a front view when the door latch device is in an open state. Similarly, it is a front view when the door latch device is in a half latch state. Similarly, it is a front view of a halfway state in which the door latch device is between a half latch state and a full latch state. Similarly, it is a front view when the door latch device is in a fully latched state. It is a rear view of the principal part when a door latch apparatus is in a full latch state similarly. It is the disassembled perspective view similarly seen from the diagonal back surface of the ratchet. It is an enlarged front view of the principal part when a door latch device is in a full latch state.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the left side in FIGS. 3 to 6 and 9 is the “vehicle inside” of the vehicle, and the right side is the “vehicle outside” of the vehicle.

  As shown in FIG. 1, a door latch device 1 includes a synthetic resin housing body 2 fixed to a door (not shown) of a vehicle body, and a metal cover plate 3 that closes the surface (rear surface) of the housing body 2. The housing 4 is provided. The housing main body 2 and the cover plate 3 are respectively provided with striker entry grooves 21 and 31 extending from the inside of the vehicle through which the striker S fixed to the vehicle body can enter to the outside of the vehicle.

  2-6, between the housing main body 2 and the cover plate 3 in the housing 4, a latch 6 pivotally mounted by a latch shaft 5 facing the front-rear direction above the striker entry grooves 21, 31 and the striker entry A ratchet 8 pivotally attached by a ratchet shaft 7 facing in the front-rear direction is provided below the grooves 21 and 31. 2 to 6, the cover plate 3 is omitted for convenience of explanation.

  The latch 6 is formed of a metal latch body 60 and a resin portion 600 integrated with the latch body 60 by insert molding. When the door is open, the latch shaft is in the open position (open state) shown in FIG. The striker S is held by the biasing force of the spring 9 wound around 5 and the striker S enters the striker entry grooves 21 and 31 from the arrow direction shown in FIG. Against this, it rotates counterclockwise about the latch shaft 5 and rotates to the half latch position (half latch state) shown in FIG. 4 and to the full latch position (full latch state) shown in FIG. 6 through the intermediate position shown in FIG. Move.

  The latch 6 includes a striker engagement groove 61 that can be engaged with the striker S that has entered the striker entry grooves 21 and 31, a half latch engagement portion 62 that can be engaged with a later-described blocking portion 81 of the ratchet 8, and a full latch engagement. The joint portion 63, the arm portion 64 to which the connecting pin 641 is fixed, and the guide surface 65 on the outermost peripheral surface extending in a circular arc shape by a predetermined angle in the counterclockwise direction around the latch shaft 5 from the tip of the half latch engaging portion 62. And are formed. The connecting pin 641 passes through the through hole 22 formed in an arc shape around the latch shaft 6 in the housing body 2 and protrudes to the back surface (front surface) side, whereby the connecting shaft 641 is connected to the latch shaft 5 on the back surface side of the housing body 2. It is connected to a close lever (not shown) pivotally supported by the same axis. The latch 6 rotates integrally with the close lever when the connecting pin 641 is connected to the close lever.

  5 to 7 and 9, reference symbol L denotes the tip of the half latch engaging portion 62 (including the guide surface 65) and the full latch engaging portion 63 when the latch 6 rotates about the latch shaft 5. The turning trajectory of the tip is shown.

  The close lever is operated by a motor that is driven when the door becomes a half door, and performs an operation of rotating the latch 6 from the half latch position to the full latch position, but this is not directly related to the present invention. Therefore, detailed description is omitted.

  The ratchet 8 has a blocking portion 81 that can be selectively engaged with the half latch engaging portion 62 and the full latch engaging portion 63 of the latch 6 and is engaged by the urging force of the spring 10 supported on the back surface of the housing body 2. When the latch 6 is biased in the open direction (counterclockwise in FIGS. 3 to 6 and 9 and clockwise in FIG. 7), the tip of the blocking portion 81 is the guide surface of the latch 6 as shown in FIG. When the latch 6 is in the half-latch position, the biasing force of the spring 10 is brought into the engagement position where the blocking portion 81 engages with the half-latch engagement portion 62 as shown in FIG. When the latch 6 is between the half latch position and the full latch position, the blocking portion 81 is held at the non-engagement position where it comes into contact with the outer peripheral surface connected to the tip of the full latch engagement portion 63. The latch 6 is blocking portion 81 as shown in FIG. 6 is held by the urging force of the spring 10 in the engaged position to engage fully latched engagement portion 63 when in the fully latched position.

  The blocking portion 81 engages with the half latch engaging portion 62 to prevent the latch 6 in the half latch position from pivoting in the open direction (clockwise in FIG. 4) and hold the door in the half door state. By engaging with the full latch engaging portion 63, the latch 6 in the full latch position is prevented from rotating in the opening direction (clockwise in FIG. 6), and the door is restrained to the fully closed state. When the ratchet 8 is in the engaged position, the ratchet 8 abuts against a stopper 11 formed of rubber fixed to the housing main body 2 to prevent further rotation in the counterclockwise direction.

  Further, the ratchet 8 includes various links (not shown) on a door opening handle (not shown) provided outside or inside the door, and an open lever (not shown) pivotally supported on the back surface of the housing body 2. By being connected to each other, the door opening handle is turned to open from the engagement position in the release direction (clockwise in FIGS. 4 and 6) against the biasing force of the spring 10 based on the opening operation of the door opening handle. Then, when the blocking portion 81 is rotated to a release position (a position slightly rotated in the release direction from the non-engagement position) completely disengaged from the half latch engagement portion 62 or the full latch engagement portion 63, the latch 6 The door can be opened by turning in the opening direction.

  The ratchet 8 which is a characteristic part of the present invention is formed of a metal ratchet main body 80 and a ratchet main body 80, and a resin made of a synthetic resin to which the ratchet main body 80 is fitted and fixed from the axial direction of the ratchet shaft 7. Formed from the body 800.

  The ratchet body 80 has a substantially omega shape that opens on the side facing the rotation locus L when viewed from the axial direction of the ratchet shaft 7, and is supported by forming a shaft hole 82 having an opening 821 on the side facing the rotation locus L. Part 83, the aforementioned blocking part 81 formed at one end of the supported part 83, and an arm part 84 extending in the vehicle interior direction from the other end of the supported part 83.

  The resin body 800 is inserted so that the ratchet shaft 7 can rotate relatively, and the ratchet body 80 is fitted from the axial direction of the ratchet shaft 7, and from the one end portion of the support portion 802 to the outside of the vehicle. A hooking portion 804 that hooks one end 101 of the protruding spring 10, a connecting portion 805 that is formed at the other end portion of the support portion 802 and protrudes rearward and into which a bent portion (not shown) formed in the open lever is fitted. Have A first small protrusion 807 (see FIGS. 3, 7, and 8) that protrudes upward is formed on the upper surface of the hook portion 804, and a protrusion piece 806 that is formed so as to face the inner surface 8051 of the connecting portion 805. A second small protrusion 808 (see FIGS. 7 and 8) protruding downward is provided at the tip.

  The support portion 802 is a bearing that protrudes forward in a cylindrical shape so that it can be fitted into the shaft hole 82 of the ratchet body 80 from the axial direction of the ratchet shaft 7 and that the ratchet shaft 7 is relatively rotatably inserted. A cylindrical portion 801 is formed.

  The support portion 802 is separated by a predetermined distance from the lower side of the bearing tube portion 801, that is, the inner circumferential surface 8012 opposite to the outer circumferential surface 8011 facing the rotation locus L in the circumferential surface of the bearing tube portion 801. On the opposite side, a wall portion 803 that protrudes forward in an arc shape in parallel with the bearing cylinder portion 801 is formed. The wall portion 803 is not formed at a portion that intersects the line X connecting the center of the latch shaft 5 and the center of the ratchet shaft 7.

  In a state where the ratchet body 80 is fitted and fixed to the resin body 800 from the axial direction of the ratchet shaft 7, the supported portion 83 of the ratchet body 80 includes the inner circumferential surface 8012 and the wall portion 803 of the bearing tube portion 801 of the resin body 800. The arm portion 84 is fitted between the inner side surface 8051 of the connecting portion 805 and the protruding piece portion 806, and the first and second small protruding portions 807 and 808 are connected to the resin body 800 by the ratchet body 80. In order to prevent it from moving in the axial direction of the ratchet shaft 7, it is engaged with the front side of the ratchet body 80 to prevent it from being pulled out. Thereby, the ratchet main body 80 is securely fitted and fixed to the resin body 800. Further, the outer circumferential surface 8011 of the bearing tube portion 801 is exposed so as to directly face the rotation locus L from the opening 821 of the shaft hole 82 in the ratchet body 80.

  As shown in FIG. 9, the opening width W of the opening 821 of the shaft hole 82 in the ratchet body 80 is narrower than the outer shape D1 of the bearing tube portion 801 of the resin body 800 and wider than the diameter D2 of the ratchet shaft 7. Set to Thus, the ratchet 8 can be pivotally supported by the ratchet shaft 7 and the outer circumferential surface 8011 of the bearing tube portion 801 is exposed from the opening 821, and the outer circumferential surface 8011 of the bearing tube portion 801 is rotated. It is possible to approach the movement locus L.

  Further, when the blocking portion 81 of the ratchet 8 is in an engagement position where the opening 821 is engaged with the full latch engaging portion 63 (or the half latch engaging portion 62) of the latch 6, the blocking portion 81 and the full latch engaging portion 63 are provided. Are directed in a direction c substantially perpendicular to a line b connecting the contact point a and the center of the ratchet shaft 7. As a result, when a force in the opening direction is applied to the latch 6 when the door is closed, the force acting on the blocking portion 81 of the ratchet 80 becomes a compressive load toward the center of the ratchet shaft 7. A load that widens the opening width W of the opening 821 of 82 does not act.

  As shown in FIGS. 3 and 5, when the ratchet 8 is in the non-engagement position, the opening 821 of the shaft hole 82 in the ratchet main body 80 faces in the direction d (direction toward the center of the latch shaft 5). Thus, the outer peripheral surface 8011 of the bearing cylinder portion 801 in the resin body 800 is close to the rotation locus L and faces the rotation locus L. Thereby, when the ratchet 8 is in the non-engagement position and the release position, the line X connecting the center of the latch shaft 5 and the center of the ratchet shaft 7 is directed from the opening 821 toward the rotation locus L. Since there is nothing other than the outer circumferential surface 8011 of the exposed bearing cylinder 801, the distance between the latch shaft 5 and the ratchet shaft 7 can be reduced, and the door lock device 1 can be easily downsized. .

  As described above, the ratchet 8 includes the metal ratchet main body 80 and the resin body 800 formed separately from the ratchet main body 80, and the ratchet main body 80 is attached to the resin body 800 from the axial direction of the ratchet shaft 7. By fitting and fixing, it becomes possible to mold the bearing tube portion 801 with higher accuracy than insert molding, and to reduce the cost.

  Further, the outer circumferential surface 8011 of the bearing cylinder portion 801 in the resin body 800 is exposed from the opening 821 of the shaft hole 82 in the ratchet body 80 toward the rotation locus L, so that the ratchet 8 is in the disengaged position and When in the release position, the bearing cylinder of the resin body 800 is located between the center of the ratchet shaft 7 and the rotation locus L of the latch 6 on the line X connecting the center of the latch shaft 5 and the center of the ratchet shaft 7. Since there are no elements other than the portion 801, a layout in which the ratchet shaft 7 is as close as possible to the rotation locus L of the latch 6 is possible. Thereby, the distance between the latch shaft 5 and the ratchet shaft 7 can be reduced, and the door lock device 1 can be easily downsized.

DESCRIPTION OF SYMBOLS 1 Door latch apparatus 2 Housing main body 21 Striker entrance groove 22 Through-hole 3 Cover plate 31 Striker entrance groove 4 Housing 5 Latch shaft 6 Latch 60 Latch main body 61 Striker engagement groove 62 Half latch engagement part 63 Full latch engagement part 64 Arm part 641 Connecting pin 65 Guide surface 600 Resin portion 7 Ratchet shaft 8 Ratchet 80 Ratchet body 81 Blocking portion 82 Shaft hole 821 Opening 83 Supported portion 84 Arm portion 800 Resin body 801 Bearing cylinder portion 8011 Outer circumferential surface 8012 Inner circumferential surface 802 Support Portion 803 Wall portion 804 Hooking portion 805 Connection portion 8051 Inner side surface 806 Projection piece portion 807 First small projection portion 808 Second small projection portion 9 Spring 10 Spring 11 Stopper 101 One end L Rotation locus S Strike

Claims (4)

A housing, a latch pivotally supported on the housing by a latch shaft, and engageable with a striker; and a housing that is pivotally supported by a ratchet shaft and engages with the striker by engaging a blocking portion with the engaging portion of the latch. In the vehicle door latch device provided with a ratchet that prevents the latch from rotating in the opening direction,
The ratchet includes a resin body having a bearing tube portion in which the ratchet shaft is relatively rotatably inserted, and a metal having the blocking portion and fitted and fixed to the resin body from the axial direction of the ratchet shaft. Including a ratchet body made of,
The ratchet body has a shaft hole in which the bearing tube portion of the resin body is fitted from the axial direction, and the side facing the rotation locus of the tip of the engagement portion of the latch is opened,
The outer circumferential surface of the circumferential surface of the bearing tube portion facing the rotation locus is exposed from the opening of the shaft hole in the ratchet body toward the rotation locus. Door latch device. The resin body further includes a wall portion projecting in the axial direction so as to face the inner circumferential surface opposite to the outer circumferential surface of the circumferential surface of the bearing tube portion with a predetermined distance therebetween. And
2. The vehicle door latch device according to claim 1, wherein the ratchet body is fitted and fixed between the inner circumferential surface of the bearing tube portion and the wall portion.   3. The vehicle door latch device according to claim 1, wherein the resin body has a plurality of claws that can engage with the ratchet body in the axial direction.   The width of the opening of the shaft hole in the ratchet body is wider than the diameter of the ratchet shaft and narrower than the outer diameter of the bearing tube portion. Vehicle door latch device.

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