JP2011169031A - Door latch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent detection failure of a latch detecting sensor due to adhesion of grease without impairing assembly workability. <P>SOLUTION: In a door latch device LA which includes a cover plate 10, a body 40 made of a synthetic resin, and the latch detecting sensor 210, rotates a latch 20 in the meshing direction in a state where a striker S enters a striker entering groove 11, and obstructs the rotation of the latch 20 in the releasing direction by engaging a ratchet 30 with the rotated latch 20 to restrict deviation of the striker S from the striker entering groove 11, a link notch 46 is formed at a part corresponding to the latch 20 in the body 40, and a link member 220 located on the surface side of the body 40 through the link notch 46 and operated according to the movement of the latch 20 is arranged in the latch 20. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a door latch device applied to a door of a vehicle.

  A vehicle such as a four-wheeled vehicle is provided with a door latch device for maintaining the door closed with respect to the vehicle main body between the vehicle main body and the door. The door latch device is configured by arranging a latch and a ratchet on a cover plate having a striker entry groove. In this door latch device, the latch is engaged with the striker that has entered the striker entry groove, and the ratchet is engaged with the latch to restrict rotation in the opening direction, thereby preventing the striker from departing from the striker entry groove. Is kept closed. On the other hand, when the engagement state of the ratchet with the latch is released, the meshing state between the latch and the striker is also released, and the striker can be deviated from the striker entry groove. Thereby, it becomes possible to open a door with respect to a vehicle main body.

  A door latch device of this type is also provided with a latch detection sensor for detecting the rotational position of the latch. The latch detection sensor is linked to the latch by a link, and can output a detection signal corresponding to the rotational position of the latch. In the door latch device provided with the latch detection sensor, the meshing state of the latch and the striker can be detected based on the detection signal of the latch detection sensor. Therefore, for example, in a state where the latch and the striker are not engaged with each other, it is possible to inform the occupant that the door is half-opened by turning on the interior light (see, for example, Patent Document 1).

Japanese Patent Publication No. 5-57688

  By the way, the cover plate and the striker of the door latch device are generally formed of metal in order to sufficiently secure the mutual meshing strength. However, when the striker comes into contact with the striker entry groove of the cover plate, if both strike, not only a loud striking sound is generated, but there is also a risk of both being damaged.

  Therefore, in recent door latch devices, a buffer material called a main body is disposed on a cover plate to solve the above-described problems. The main body is formed into a thick block shape with a relatively hard synthetic resin material, and has a buffer groove corresponding to the striker entry groove of the cover plate. The body body is attached to the cover plate in such a manner that the buffer groove is matched with the striker entry groove, the tip is matched with the tip surface of the cover plate, and the latch and the ratchet arranged on the cover plate are covered. . The reason why the latch and the ratchet disposed on the cover plate are covered with the main body is to position the meshing position with the striker on the fixed base end side of the striker. According to the door latch device having the main body as described above, since the main body comes into contact with the striker before the striker contacts the cover plate, the impact when the striker enters the striker entry groove is mitigated. At the same time, the generation of the hitting sound can be suppressed.

  However, in the door latch device including the main body, the latch detection sensor linked to the latch is disposed between the main body and the cover plate. Therefore, the latch detection sensor is attached after the main body is attached to the cover plate. It becomes difficult to assemble.

  In an ordinary door latch device, when assembling a latch or a ratchet, grease is applied to make these operations smooth. However, when this grease adheres to the latch detection sensor, it may cause a detection failure. For this reason, it is preferable that the latch detection sensor is assembled last. That is, in order to reliably prevent the detection failure of the latch detection sensor in the door latch device described above, the latch detection sensor must be assembled with the body body once assembled to the cover plate removed. Assembling workability will be significantly impaired.

  In view of the above circumstances, an object of the present invention is to provide a door latch device that can prevent detection failure of a latch detection sensor due to adhesion of grease without impairing assembly workability.

  In order to achieve the above object, a door latch device according to the present invention has a striker entry groove into which a striker enters, a cover plate provided with a latch and a ratchet at a position sandwiching the striker entry groove, and a mode that covers the latch. The main body body made of a synthetic resin having a buffer groove at a portion corresponding to the striker entry groove and a latch detection sensor for detecting the rotation position of the latch with respect to the main body body is provided on the cover plate. Rotate the latch in the meshing direction with the striker entering, and engage the ratchet with the rotated latch to prevent the latch from rotating in the opening direction and regulate the deviation of the striker from the striker entry groove In the door latch device, a link notch is formed in the body body at the part corresponding to the latch. And, the latch, located on the surface side of the main body through the notch link, characterized in that disposed on the link member that operates in accordance with the movement of the latch.

  Further, the present invention provides a switch plate having a sensor holding portion that is latched to the surface of the main body body via a temporary fixing means provided between the door latch device and the main body, and that holds a latch detection sensor. It is characterized by providing.

  Further, according to the present invention, in the door latch device described above, a guide pin is provided at the distal end portion of the link member along the axis of rotation of the latch, and a guide groove is formed in a portion corresponding to the guide pin in the main body and the switch plate. The leading end of the link member is sandwiched between the main body and the switch plate, and the guide pins are slidably received in the guide grooves of the main body and the switch plate, respectively.

  In the door latch device described above, the present invention is characterized in that linear guide grooves are formed in the main body and the switch plate.

  According to the present invention, in the door latch device described above, the latch detection sensor has a signal cable extending from the sensor body, and the switch plate has a cable holding portion that holds a portion of the signal cable adjacent to the sensor body. It is characterized by having.

  According to the present invention, since the latch detection sensor can be attached to the surface side of the main body, the latch detection sensor can be assembled after the latch, ratchet, and main body are attached to the cover plate. Therefore, even when a sufficient amount of grease is applied to the latch or ratchet, this does not adhere to the latch detection sensor and cause a detection failure. In addition, since the latch, ratchet, main body, and latch detection sensor need only be assembled to the cover plate in order, the assembly operation of the latch detection sensor can be performed satisfactorily.

FIG. 1 is a partially cutaway side view showing a main part of a door latch device according to an embodiment of the present invention. FIG. 2 is a rear view of the door latch device shown in FIG. FIG. 3 is a front view of the door latch device shown in FIG. FIG. 4 is a perspective view of a four-wheeled vehicle to which the door latch device shown in FIG. 1 is applied. FIG. 5 is a conceptual diagram showing an engagement state of the latch and the ratchet of the door latch device shown in FIG. FIG. 6 is a perspective view showing a cover plate, a main body, and a back plate applied to the door latch device shown in FIG. FIG. 7 is a view of a main body applied to the door latch device shown in FIG. FIG. 8 is a conceptual diagram showing the state of the link member and the latch detection sensor when the latch is arranged at the full latch position in the door latch device shown in FIG. FIG. 9 is a conceptual diagram showing a state of the link member and the latch detection sensor when the latch is arranged at the open position in the door latch device shown in FIG. FIG. 10 is an arrow X view in FIG. 9. FIG. 11 is a diagram showing the operation of the actuator unit when the door latch device shown in FIG. 1 is in a locked state. FIG. 12 is a diagram showing the operation of the actuator unit when the door latch device shown in FIG. 1 is in the unlocked state. FIG. 13 is a conceptual diagram of a cable lever applied to the actuator unit of the door latch device shown in FIG. FIG. 14 is a conceptual diagram of an open lever applied to the actuator unit of the door latch device shown in FIG. FIG. 15 is a conceptual diagram of a lock lever applied to the actuator unit of the door latch device shown in FIG. FIG. 16 is a conceptual diagram of a unit cover applied to the actuator unit of the door latch device shown in FIG. FIG. 17 is a cross-sectional view showing a terminal portion of an electric motor applied to the actuator unit of the door latch device shown in FIG. 18 shows a terminal member of an electric motor applied to the actuator unit of the door latch device shown in FIG. 1, where (a) is a Y view in FIG. 17 and (b) is FIG. 18 (a). FIG. FIG. 19 is a conceptual diagram of a switch plate applied to the door latch device shown in FIG. 20 is a rear view of the switch plate shown in FIG.

  Exemplary embodiments of a door latch device according to the present invention will be explained below in detail with reference to the accompanying drawings.

  1 to 3 show a door latch device according to an embodiment of the present invention. As illustrated in FIG. 4, the door latch device LA exemplified here closes a back door D called a tailgate with respect to the vehicle main body B by meshing with a striker S provided on the vehicle main body B of the four-wheeled vehicle. It is to maintain the state. The back door D is supported on the upper edge of the rear end of the vehicle main body B, and can open and close the rear end opening of the vehicle main body B by rotating around the axis along the left-right direction. .

  As shown in FIGS. 1 to 3 and 5, the door latch device LA of the present embodiment includes a cover plate 10. The cover plate 10 serves as a base of the door latch device LA, and is formed of a metal plate having a relatively large thickness. The cover plate 10 is provided with a striker entry groove 11 in a rectangular plate base portion 10a, and a latch shaft 12 and a ratchet shaft 13 on both sides of the striker entry groove 11. The striker entry groove 11 is a notch provided from the center of the front end of the plate base portion 10a toward the base end, and has a width that allows the striker S to be inserted. The latch shaft 12 and the ratchet shaft 13 are columnar members that protrude from the inner surface of the plate base portion 10a in a manner that is parallel to each other. A latch 20 is rotatably disposed on the latch shaft 12, and a ratchet 30 is rotatably disposed on the ratchet shaft 13.

  The latch 20 is a plate-like member having a meshing groove 21 opened on the outer peripheral surface, and can rotate around the axis of the latch shaft 12 in a manner that the meshing groove 21 intersects the striker entry groove 11. . When the latch 20 is rotated counterclockwise in FIG. 5 (hereinafter referred to as the “opening direction”), as shown in FIG. 5A, the striker 21 has an opening in the engagement groove 21 formed in the plate base portion 10a. The hook portion 22 that matches the opening of the entry groove 11 and is located on the right side of the engagement groove 21 is retracted from the striker entry groove 11 (hereinafter, the position of the latch 20 shown in FIG. "Unlatch position"). Further, in this unlatched position, the striker contact portion 23 of the latch 20 that faces the hook portion 22 across the engagement groove 21 is inclined so as to gradually approach the opening of the striker entry groove 11 toward the tip. Placed in. When the latch 20 is rotated clockwise (hereinafter referred to as “meshing direction”) from the state shown in FIG. 5A, the hook portion 22 of the latch 20 gradually enters the striker as shown in FIG. 5B. As shown in FIG. 5C, the hook portion 22 crosses the depth of the striker entry groove 11 so that the opening of the striker entry groove 11 is moved. The position of the latch 20 shown in FIG. 5B is hereinafter referred to as “half latch position”, and the position of the latch 20 shown in FIG. 5C is referred to as “full latch position”.

  The ratchet 30 is a plate-like member having a latch engagement portion 31, a first release operation input portion 32, and a second release operation input portion 33. And is arranged so as to be rotatable around the axis of the ratchet shaft 13. The latch engaging portion 31 is a portion extending radially outward from the ratchet shaft 13, and when the ratchet 30 rotates clockwise in FIG. 5, the striker contact portion 23 of the latch 20 or It is possible to engage with the outer peripheral claw portion 24. Specifically, as shown in FIG. 5B, when the latch 20 is rotated clockwise with the latch 20 disposed at the half latch position, the latch engaging portion 31 of the ratchet 30 24, and when the latch 20 rotates clockwise with the latch 20 disposed at the fully latched position, the latch engaging portion 31 of the ratchet 30 makes contact with the striker of the latch 20, as shown in FIG. The engagement with the portion 23 prevents the latch 20 from rotating in the opening direction at each position. Therefore, if the ratchet 30 is engaged with the latch 20 with the striker S entering the striker entry groove 11 of the latch 20, the movement in the release direction from the half latch position or the full latch position is prevented, and the vehicle body B is prevented from moving. Thus, the back door D can be kept closed.

  The first release operation input unit 32 and the second release operation input unit 33 of the ratchet 30 each function as an operation unit when the ratchet 30 is rotated counterclockwise in FIG. The first release operation input portion 32 is a portion that extends radially outward from the ratchet shaft 13 at a position adjacent to the latch engagement portion 31. The second release operation input unit 33 extends along the extending direction of the ratchet shaft 13 after extending from the ratchet shaft 13 in a radially outward direction at a position shifted by approximately 180 ° from the first release operation input unit 32. Part.

  Although not shown in the figure, the latch 20 is provided with a latch spring for rotating the latch 20 counterclockwise in FIG. In FIG. 5, a ratchet spring for rotating the ratchet 30 clockwise in FIG.

  The cover plate 10 is provided with a main body 40 and a back plate 50 as shown in FIGS. The main body 40 is formed into a thick block shape with a relatively hard synthetic resin material, and is formed in a size that covers the inner surface of the front end of the cover plate 10 as shown in FIGS. . In the main body 40, shaft insertion holes 41 and 42 are formed at portions corresponding to the latch shaft 12 and the ratchet shaft 13, and a buffer groove 43 is formed at a portion corresponding to the striker entry groove 11. The shaft insertion holes 41 and 42 are through holes having inner diameters that fit into the latch shaft 12 and the ratchet shaft 13, and the length along the axial direction is shorter than the latch shaft 12 and the ratchet shaft 13. . The buffer groove 43 is a notch provided from the center of the front end of the main body 40 toward the base end, and is formed to have a slightly narrower width than the striker entry groove 11. The opening end portion of the buffer groove 43 has a size that allows the striker S to be inserted, while the rear end portion of the buffer groove 43 is formed so that the width gradually decreases toward the back. A reference numeral 44 in FIG. 7 is an elastic member for a cushion attached to the innermost part of the buffer groove 43.

  The main body 40 is disposed on the inner surface side of the cover plate 10 so as to cover the latch 20 and the ratchet 30 by inserting the latch shaft 12 and the ratchet shaft 13 into the corresponding shaft insertion holes 41 and 42. The body body 40 attached to the cover plate 10 is positioned and arranged so that the front end surface thereof coincides with the front end surface of the cover plate 10 and the inner wall surfaces on both sides of the buffer groove 43 protrude from the inner wall surfaces on both sides of the striker entry groove 11. The Reference numeral 45 in FIGS. 6 and 7 is an opening for operation formed at the tip of the main body 40. This opening 45 for operation is a through-hole for operating the 2nd cancellation | release operation input part 33 of the ratchet 30 covered with the main body 40 from the outside.

  As shown in FIGS. 1, 2, and 6, the back plate 50 is separated from the main body 40 by a latch cover portion 50 </ b> A that covers the base end surface of the main body 40 and the base end of the latch cover portion 50 </ b> A. A plate-like member having a unit holding portion 50B bent in a direction and integrally forming the latch cover portion 50A and the unit holding portion 50B. The latch cover portion 50 </ b> A of the back plate 50 has shaft mounting holes 51, 52 at portions corresponding to the shaft insertion holes 41, 42 of the main body 40, and is notched at a portion corresponding to the striker entry groove 11 of the cover plate 10. It has a groove 53 and is connected to the cover plate 10 by caulking the tip of the latch shaft 12 and the tip of the ratchet shaft 13 in the shaft mounting holes 51 and 52. As apparent from FIG. 6, a lever insertion opening 54 is provided at a portion of the latch cover portion 50 </ b> A corresponding to the first release operation input portion 32 of the ratchet 30. The lever insertion opening 54 is a through hole for operating the first release operation input portion 32 from the outside, and has a long side that is rectangular along the left-right direction of the ratchet cover portion 50A. The release operation part 131 is formed in such a width that it can swing in the left-right direction by the rotation of

  The unit holding part 50B of the back plate 50 is a part for holding the actuator unit 100 as shown in FIGS. The actuator unit 100 is for releasing the latch engaging portion 31 of the ratchet 30 with respect to the latch 20, and includes an open lever shaft 101, a lock lever shaft 102, and an electric motor 110. ing.

  As shown in FIGS. 11 and 12, the open lever shaft 101 is provided on the side edge portion of the unit holding portion 50B of the back plate 50 close to the lever insertion opening 54, and the cable lever 120 and the open lever 130 are provided. It is rotatably supported.

  As shown in FIGS. 11 to 13, the cable lever 120 includes an operation output portion 121 and a cable engagement portion 122, and is disposed at the base end portion of the open lever shaft 101. The operation output portion 121 of the cable lever 120 is a portion extending from the open lever shaft 101 toward the center side of the unit holding portion 50B. The cable engaging portion 122 of the cable lever 120 is a portion extending in the radially outward direction at a position shifted by approximately 180 ° from the operation output portion 121, and the extending end portion extends from one side edge of the unit holding portion 50B. It protrudes to the outside. Although not clearly shown in the drawing, an operation cable linked to an operation handle (not shown) provided on the back door D is engaged with the extended end portion of the cable engagement portion 122.

  As shown in FIGS. 11, 12, and 14, the open lever 130 includes a release operation output portion 131 and an engagement input portion 132, and is positioned at a position overlapping the cable lever 120 on the distal end side of the open lever shaft 101. It is arranged. The release operation output portion 131 of the open lever 130 extends radially outward from the open lever shaft 101 toward the latch cover portion 50A of the back plate 50, and its tip portion enters the inside through the lever insertion opening 54. is doing. As shown by a two-dot chain line in FIG. 5C, the release operation output portion 131 of the open lever 130 is the first in the figure when the latch engaging portion 31 of the ratchet 30 is engaged with the latch 20. It is located on the right side of the 1 release operation input part 32, and can contact the first release operation input part 32 of the ratchet 30 when the open lever 130 rotates around the axis of the open lever shaft 101. As shown in FIG. 14, the engagement input portion 132 of the open lever 130 is a portion extending from the open lever shaft 101 toward the center side of the unit holding portion 50 </ b> B at a position shifted by approximately 90 ° from the release operation output portion 131. It is. The engagement input portion 132 is provided with a slider 133. The slider 133 includes a slide base 133a that is movably disposed along the extending direction of the engagement input portion 132, an engagement pin 133b that projects from the surface of the slide base 133a that faces the unit holding portion 50B, and a slide. The base 133a includes a cam pin 133c projecting on a surface separated from the unit holding portion 50B. When the slider 133 is disposed on the proximal end side of the engagement input portion 132, the slider 133 can be engaged with the operation output portion 121 of the cable lever 120 via the engagement pin 133b. When it is moved to the side, it can be disengaged from the operation output portion 121 of the cable lever 120. In addition, an open lever spring 134 that rotates the open lever 130 counterclockwise in FIGS. 11 and 12 is interposed between the open lever 130 and the unit holding portion 50B.

  As shown in FIGS. 11 and 12, the lock lever shaft 102 of the actuator unit 100 is provided at a position closer to the center side than the open lever shaft 101 and apart from the latch cover portion 50A in the unit holding portion 50B. The lever 140 is rotatably supported.

  As shown in FIGS. 11, 12, and 15, the lock lever 140 includes a cam lever portion 141 and a sector gear portion 142, and the lock lever 140 overlaps with the engagement input portion 132 of the open lever 130. It is disposed on the shaft 102. The cam lever portion 141 extends radially outward from the lock lever shaft 102 toward the latch cover portion 50 </ b> A, and has a cam groove 143. The cam groove 143 is a curved notch formed so that a portion toward the open lever shaft 101 is concave. A cam pin 133c of the slider 133 passes through the cam groove 143 so as to be slidable. The sector gear portion 142 is a portion formed in a fan shape centering on the lock lever shaft 102 at a position shifted from the cam lever portion 141 by approximately 180 °, and has a gear 144 on an arc-shaped outer peripheral surface.

  As shown in FIGS. 2, 11, and 12, the electric motor 110 is disposed in a portion of the unit holding portion 50 </ b> B that is farthest from the latch cover portion 50 </ b> A, and a worm gear 112 is provided on the output shaft 111. The worm gear 112 meshes with a gear 144 formed on the sector gear portion 142 of the lock lever 140, and can rotate the lock lever 140 about the axis of the lock lever shaft 102 when the electric motor 110 is driven. is there.

  As shown in FIGS. 2 and 3, the actuator unit 100 described above is provided with a unit cover 150. The unit cover 150 is formed of a synthetic resin material, and has a size that covers the entire portion of the actuator unit 100 excluding the cable engagement portion 122 of the cable lever 120. The back plate 50 is fastened by fastening means such as screws. It is attached to.

  As shown in FIGS. 16 and 17, the unit cover 150 is provided with a pair of terminal members 152 and 153 in a motor accommodating portion 151 that accommodates the electric motor 110. The terminal members 152 and 153 serve as power supply terminals for the electric motor 110. As shown in FIGS. 16 to 18, the terminal members 152 and 153 have cover engaging portions 152a and 153a at one end and the other end. The contact portion 152b, 153b is provided in the portion. The cover engaging portions 152a and 153a are portions that are mounted and locked in terminal mounting holes 154 provided in the unit cover 150, and have locking claw pieces 152c and 153c. The locking claw pieces 152c and 153c are strip portions in which one end side of the terminal members 152 and 153 is a base end, and a distal end located on the other end side is a free end. As representatively shown in FIG. 18, the locking claw pieces 152 c and 153 c are surrounded by the cover engaging portions 152 a and 153 a around the entire circumference except for the plate thickness direction, from the base end toward the tip. Gradually inclines in the out-of-plane direction. As shown in FIG. 3, one end of each of the terminal members 152 and 153 protrudes outward from a terminal mounting hole 154 opened on the outer surface of the unit cover 150 to constitute a connector connection terminal. As shown in FIGS. 3 and 17, the terminal mounting hole 154 is engaged in such a manner that the terminal mounting hole 154 is surrounded by the engagement hole 154a having a size that can be inserted through the cover engagement portions 152a and 153a, and the engagement hole 154a. The pawl pieces 152c and 153c have locking pawl holes 154b that can prevent the pawl pieces 152c and 153c from coming off. The locking claw hole 154b has a protrusion 154c that can be locked to the locking claw pieces 152c and 153c. The terminal members 152 and 153 are reliably prevented from being detached from the unit cover 150 by locking the locking claw pieces 152c and 153c to the protrusion 154c. In addition, since the cover engaging portions 152a and 153a and the engaging hole portion 154a are held so as to surround the locking claw pieces 152c and 153c, one end portion of the terminal members 152 and 153 is prevented from being displaced. It is possible to reliably connect a connector (not shown) of the power feeding cable. The contact portions 152b and 153b are provided at positions where the electric motor 110 is connected to an input terminal of the electric motor 110 when the electric motor 110 is accommodated in the motor accommodating portion 151 of the unit cover 150. Therefore, if a connector (not shown) of a power feeding cable is connected to the terminal mounting hole 154, power can be supplied to the electric motor 110 accommodated in the unit cover 150.

  In the actuator unit 100 configured as described above, when the electric motor 110 is driven and the lock lever 140 is arranged in a counterclockwise direction in the drawing as shown in FIG. The slider 133 is moved to the distal end side in the engagement input portion 132 of the open lever 130 via the cam pin 133c penetrating the pin 143 (locked state). In this state, as shown in FIG. 11B, the unillustrated operation handle provided on the back door D is opened, and the cable lever 120 is rotated clockwise in the drawing via the operation cable. Even in this case, the operation output portion 121 of the cable lever 120 and the engagement pin 133b of the slider 133 are not engaged. Therefore, the open lever 130 does not rotate depending on the opening operation of the operation handle (not shown), and the release operation output part 131 of the open lever 130 does not contact the first release operation input part 32 of the ratchet 30.

  On the other hand, the electric motor 110 is driven from the state shown in FIG. 11, and the lock lever 140 is rotated clockwise in the figure, so that the lock lever 140 is rotated clockwise as shown in FIG. When arranged, the slider 133 moves to the proximal end side in the engagement input portion 132 of the open lever 130 via the cam pin 133c penetrating the cam groove 143 (unlocked state). In this state, as shown in FIG. 12B, the unillustrated operation handle provided on the back door D is opened, and the cable lever 120 is rotated clockwise in the drawing via the operation cable. In this case, since the operation output portion 121 of the cable lever 120 is engaged with the engagement pin 133b of the slider 133, the open lever 130 is rotated clockwise in the drawing via the slider 133. As a result, the release operation output portion 131 of the open lever 130 comes into contact with the first release operation input portion 32 of the ratchet 30 and rotates the ratchet 30 counterclockwise in FIG. Even in the engaged state, this is released, and the latch 20 is allowed to rotate in the opening direction.

  On the other hand, the door latch device LA is provided with a detection unit 200 for detecting the rotational position of the latch 20 with respect to the cover plate 10 as shown in FIG. The detection unit 200 includes a latch detection sensor 210 and a link member 220 for operating the latch detection sensor 210.

  As shown in FIGS. 19 and 20, the latch detection sensor 210 includes a swing lever 212 and a plunger 213 in the sensor body 211, and swings in a direction in which the tip of the swing lever 212 approaches the sensor body 211. In this case, it is called a micro switch that detects this via the plunger 213, and is sandwiched between the surface of the main body 40 and the latch cover portion 50A of the back plate 50 via the switch plate 230. Is retained. The switch plate 230 is configured in a plate shape having a plate thickness sandwiched between the surface of the main body 40 and the latch cover portion 50A, and the latch detection sensor 210 is provided on the inner surface (sensor holding portion) 230a. keeping. The switch plate 230 is provided with a cable holding portion 231. The cable holding portion 231 is a linear recess for laying and holding the signal cable 214 extending from the sensor body 211 of the latch detection sensor 210 in a bent state. The switch plate 230 is attached to the surface of the main body 40 via the temporary fixing means 300 in a state where the latch detection sensor 210 is sandwiched between the switch plate 230 and the surface of the main body 40. The temporary fixing means 300 is for simply locking the switch plate 230 to the main body 40.

  In the present embodiment, as shown in FIGS. 7 to 10, the body body 40 is provided with a pair of positioning pins 301 and a pair of temporary fixing claws 302, while as shown in FIGS. 19 and 20, The temporary fixing means 300 is configured by providing a pair of positioning holes 303 and a pair of temporary fixing hooks 304. As shown in FIG. 7, the positioning pin 301 has a thin cylindrical shape, and protrudes from the main body 40 in a manner in which the positioning pins 301 are parallel to each other. As shown in FIGS. 7 to 10, the temporary fastening claws 302 are convex portions formed on the surface of the main body 40 along the plate thickness direction, and the amount of protrusion gradually increases as they approach the cover plate 10. In addition, a locking surface is provided at a portion facing the cover plate 10. The positioning hole 303 is an opening having an inner diameter that fits with the positioning pin 301 and is formed in a manner of penetrating the switch plate 230 in a portion corresponding to each positioning pin 301. As shown in FIG. 10, the temporary fixing hook 304 has a size large enough to cover the temporary fixing claw 302 and has an opening large enough to allow the temporary fixing claw 302 to be loosely fitted in the center. It has a tongue-like shape and is provided at a portion corresponding to each temporary fixing claw 302.

  The link member 220 is for transmitting the operation of the latch 20 to the swing lever 212 of the latch detection sensor 210. As shown in FIGS. 5, 8, and 9, the link member 220 has a latch pin 221 at one end, while the other A guide pin 222 is provided at the end. The latch pin 221 passes through the main body 40 via a link notch 46 formed in the main body 40, and a tip end thereof is pivotally fixed to the end surface of the latch 20. The guide pin 222 protrudes from both the front and back surfaces of the link member 220, and each protruding end portion is slidably accommodated in guide grooves 47 and 232 provided in the main body 40 and the switch plate 230. As shown in FIGS. 7 to 9, 19, and 20, the guide grooves 47 and 232 form a straight line along the extending direction of the striker entry groove 11. The tip of the swing lever 212 extending from the sensor main body 211 of the latch detection sensor 210 intersects with the portion located on the back side of the guide grooves 47 and 232.

  According to the detection unit 200 configured as described above, when the latch 20 moves with respect to the cover plate 10, the position of the link member 220 with respect to the guide grooves 47 and 232 changes accordingly. The position of the plunger 213 changes via the swing lever 212. Therefore, from the output result of the latch detection sensor 210, it is possible to detect whether the current latch 20 is located at the open position or the full latch position. As a result, for example, in a state where the latch 20 and the striker S are not engaged with each other, it is possible to inform the occupant that the back door D is in a half-open state by turning on the interior light.

  Moreover, since the link member 220 is arranged on the surface side of the main body 40 through the link notch 46 formed in the main body 40, the latch 20, the ratchet 30, and the main body 40 are attached to the cover plate 10. After that, the latch detection sensor 210 can be assembled. Accordingly, even when the grease is sufficiently applied to the latch 20 and the ratchet 30, there is no possibility that it adheres to the latch detection sensor 210 and causes a detection failure. Furthermore, since the latch 20, the ratchet 30, the main body 40, and the latch detection sensor 210 may be assembled to the cover plate 10 in order, the assembly operation of the latch detection sensor 210 can be performed satisfactorily. Further, as shown in FIGS. 9 and 10, the switch plate 230 is disposed in the back of the striker entry groove 11 that does not overlap the link cutout 46, thereby confirming the connection state between the latch pin 221 and the link member 220. Therefore, the reliability as the apparatus is high.

  In this case, since the latch detection sensor 210 is attached to the main body 40 via the switch plate 230, the handleability of the latch detection sensor 210 configured to be relatively small can be improved. In addition, since the signal cable 214 extending from the sensor main body 211 is held by the cable holding portion 231 of the switch plate 230, even if a tensile force acts on the signal cable 214, this may be soldered to the signal cable 214. The reliability of the latch detection sensor 210 can be significantly improved without being added to the portion. In addition, the switch plate 230 is attached to the main body 40 after being temporarily fixed via the temporary fixing means 300 and then sandwiched between the back cover 50 and the latch cover portion 50A. For this reason, as described above, as the temporary fixing means 300, the positioning pin 301 is fitted into the positioning hole 303, and only the positioning along the surface of the main body 40 is surely performed. For such a direction, it is sufficient to loosely fit each other, such as the temporary fixing claws 302 and the temporary fixing hooks 304, to prevent the falling off. Thereby, the mounting work of the switch plate 230 to the main body 40 can be easily performed, and the workability thereof can be improved.

DESCRIPTION OF SYMBOLS 10 Cover plate 11 Striker entrance groove 20 Latch 30 Ratchet 40 Main body body 46 Link notch 47,232 Guide groove 200 Detection unit 210 Latch detection sensor 214 Signal cable 220 Link member 230 Switch plate 231 Cable holding part 300 Temporary fixing means B Vehicle main body D Backdoor S striker

Claims (5)

A cover plate having a striker entry groove into which a striker enters and having a latch and a ratchet at a position sandwiching the striker entry groove, and a portion corresponding to the striker entry groove disposed on the cover plate so as to cover the latch A synthetic resin main body body having a buffer groove and a latch detection sensor for detecting the rotation position of the latch with respect to the main body body, while rotating the latch in the meshing direction with the striker entering the striker entry groove, In the door latch device which prevents the rotation of the latch in the opening direction by engaging the ratchet with the rotated latch and regulates the deviation of the striker from the striker entry groove,
In the body body, a link notch is formed in the part corresponding to the latch,
A door latch device characterized in that the latch is provided with a link member that is positioned on the surface side of the main body through the link cutout and that operates in accordance with the movement of the latch.   The switch plate having a sensor holding portion that holds the latch detection sensor and is latched to the surface of the main body through a temporary fixing means provided between the main body and the body. Door latch device.   A guide pin is provided at the tip of the link member along the axis of rotation of the latch, while a guide groove is formed in a portion corresponding to the guide pin in the main body and the switch plate, and the tip of the link member is connected to the main body and the switch plate. The door latch device according to claim 2, wherein the guide pin is slidably received in the guide groove of the main body and the switch plate.   The door latch device according to claim 3, wherein a linear guide groove is formed in the main body and the switch plate. The latch detection sensor is a signal cable extending from the sensor body.
The door latch device according to claim 2, wherein the switch plate includes a cable holding portion that holds a portion of the signal cable adjacent to the sensor main body.

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