JP5844075B2 - Vehicle latch device - Google Patents

Description

  The present invention relates to a latch device, and more particularly, to a latch device used for fixing a vehicle component.

  In general, a seat provided so as to be rotatable with respect to the vehicle body is provided with a latch device on a leg or the like, and the latch device is fixed to the vehicle body by engaging with a striker fixed to the vehicle body. Such a latch device is configured, for example, as disclosed in Patent Document 1 such that a rotating part such as a latch or a ratchet is supported on a base plate. The base plate, the latch, and the ratchet are made of metal.

Japanese Patent No. 4318213

  However, when a metal latch or ratchet is provided as a mechanical component on a metal base plate, a metal sound is generated due to the metals contacting each other during operation. Such a metallic noise may not be very preferable depending on the location where the latch device is provided.

  The present invention has been made in view of the above-described background, and an object of the present invention is to provide a good feeling of operation by reducing the contact between metals in a vehicle latch device.

The present invention that solves the above-described problems is a vehicle latch device that locks or unlocks by engaging or disengaging from a rod-shaped portion, and is housed in the housing and is mounted in the housing. And a latch having a metal hook-like portion that is movably supported and engageable with the rod-like portion, and the housing is located on one side of the latch with respect to the latch in a rotation axis direction of the latch. It has the 1st wall which opposes, and the 2nd wall which opposes the said latch on the other side in the said rotation axis direction with respect to the said latch, and both the said 1st wall and the said 2nd wall are resin It is characterized by.

  According to such a configuration, since the housing supporting the latch using metal is made of resin, the contact between the inner wall of the housing and the side surfaces of the latch (surfaces at both ends in the rotation axis direction) is a contact between the metals. This eliminates the metal sound and provides a smooth operating feeling.

  In the vehicle latch device described above, it is preferable that the casing is formed in a box shape by combining two members, and the two members are integrally formed by being connected by a hinge.

  If the two members that make up the housing are connected and integrally formed by hinges, the two members can be molded at the same time, reducing costs and combining the two members into a box shape. Even during the work, the work can be done instantly without worrying about the direction of the members, so the productivity is very good.

  In the above-described vehicle latch device, the housing integrally includes a first shaft that protrudes inward, and the latch includes a first hole portion that fits into the first shaft, and the first shaft. It is desirable that the latch is rotatably supported by the housing by the engagement of the first hole portion.

  As described above, the first hole portion of the latch is supported by the first shaft of the housing formed of resin, so that the metal sound can be reduced and a smoother operation feeling can be obtained.

  Further, in the vehicle latch device described above, the latch is engaged with the rod-shaped portion by being accommodated in the housing and rotatably supported by the housing, and engaging the latch. Further comprising a metal ratchet that maintains a possible closed state and an open state that separates from the rod-like portion, the housing integrally has a second shaft that protrudes inward, and the ratchet is attached to the second shaft. It is desirable that a second hole portion to be fitted is provided, and that the ratchet is rotatably supported by the housing by the engagement of the second shaft and the second hole portion.

  In this way, the second hole portion of the ratchet is supported by the second shaft of the housing formed of resin, so that the metal sound can be reduced and a smoother operational feeling can be obtained.

  In the vehicle latch device described above, the first shaft is formed in a cylindrical shape, and further includes a first fastening member that penetrates the inside of the cylinder of the first shaft and fixes the vehicle latch device to another device. It is desirable. Alternatively, the second shaft is preferably formed in a cylindrical shape, and further includes a second fastening member that penetrates the inside of the cylinder of the second shaft and fixes the vehicle latch device to another device.

When the latch or ratchet is pivotally supported by the resin shaft, the rigidity is lowered if the resin shaft is formed into a cylindrical shape, but the rigidity of the shaft can be increased by penetrating the fastening member inside. In addition, by providing the fastening part with a function of reinforcing the shaft, the number of parts can be reduced as compared with the case where a separate reinforcing part is provided. Further, it becomes possible to mold the axial wall thickness of the same and the housing, it is possible to improve the accuracy of the molding.

  In the vehicle latch device described above, it is preferable that the housing has a first rib protruding toward the inside of the housing around the first shaft.

  As described above, since the first rib is provided inside the housing, the contact portion between the latch and the ratchet and the housing is reduced, so that the operational feeling can be made smoother.

In the vehicle latch device described above, the closed device is accommodated in the housing and is rotatably supported by the housing, and engages with the latch so that the latch can engage with the rod-shaped portion. A metal ratchet that maintains a state and an open state that is detached from the rod-like portion, and a metal ratchet that is rotatably supported by the latch and that engages the ratchet to transmit the operation of the ratchet to the latch A lever member; and a biasing member that engages with the lever member and the ratchet. The housing has a second shaft that protrudes inward, and the ratchet is attached to the second shaft. a second hole portion to be fitted, said second bore and a flange projecting in the axial direction of the second hole portion around said second axis and said second said by engagement of the hole ratchet Is pivotally supported by the housing. Are, the lever member, the latch can when in the closed state, a constitution in which in contact with the flange by the urging force of the urging member.

  When the ratchet is supported by the resin shaft, if the lever member is brought into contact with the resin shaft in order to prevent play of the lever member, the resin shaft may be worn out. A flange that protrudes in the axial direction of the hole is provided around the hole, and the lever member is brought into contact with the flange to prevent play of the lever member even when a resin shaft is employed, and Wear can also be prevented.

According to the structure of Claim 1, the contact of the inner wall of a housing | casing and the side surface of a latch is lose | eliminated not a metal-to-metal contact, metal sound can be lost, and a smooth operation feeling can be obtained. In addition, even when a resin shaft is used for supporting the ratchet, play of the lever member can be prevented and wear of the resin can also be prevented.

  According to the configuration of the second aspect, the two members can be formed at a time, and the cost can be reduced. Also, when the two members are combined into a box shape, the directions of the members are Productivity is very good because the work can be done instantly without worrying about

  According to the configuration of the third aspect, the first hole portion of the latch is supported by the first shaft of the housing formed of resin, thereby reducing metal noise and obtaining a smoother operating feeling. Can do.

According to the structure of Claim 4 , while the rigidity of the axis | shaft of the resin which supports a latch can be made high, reduction of a number of parts can be aimed at.

According to the structure of Claim 5 , while the rigidity of the axis | shaft of resin which supports a ratchet can be made high, reduction of a number of parts can be aimed at.

According to the structure of Claim 6 , the contact part of a latch and a housing | casing can be decreased, and an operation feeling can be made smoother.

It is a perspective view of a seat frame of a vehicle seat provided with a vehicle latch device. It is a disassembled perspective view of the latch apparatus for vehicles. It is the front view which looked at the reinforcement board and the lower plate from the inner side. It is a perspective view of a load receiving member. FIG. 4 is an exploded perspective view (a) of a reinforcing plate, a lower plate and a load receiving member of a vehicle latch device, and a sectional view taken along line III-III (a) in a state in which these are assembled. It is sectional drawing which shows the latch apparatus for vehicles in a locked state. It is sectional drawing explaining the structure which pivotally supports a latch. It is a figure explaining operation | movement of the latch apparatus for vehicles, and shows the state which pulled the rod a little. It is a figure explaining operation | movement of the latch apparatus for vehicles, and shows the state which pulled the rod large. It is a figure explaining operation | movement of the latch apparatus for vehicles, and shows the state which returned the rod and the ratchet contacted the latch. It is a figure explaining operation | movement of the latch apparatus for vehicles, and shows a lock release state.

  Hereinafter, an embodiment of a vehicle latch device according to the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, a vehicle latch device 1 according to an embodiment is provided, for example, on a side frame S <b> 1 that constitutes a backrest of a frame S of a vehicle seat such as an automobile that is an example of another device. . As an example, a bracket S2 made of sheet metal is welded to the side frame S1, and the vehicle latch device 1 is connected to a welding nut WN fixed to the bracket S2 as an example of a first fastening member and a second fastening member. The bolt 90 is fixed.

The vehicle latch device 1 is configured by housing a mechanical component such as a latch 30 in a housing 2. The housing 2 is formed with an entrance groove 2A that opens to the right in FIG. 1, and the latch 30 is in a closed state or an open state when the hook-shaped portion advances or retracts into the entrance groove 2A. . The vehicle latch device 1 can be locked by being pressed and engaged with a rod-like portion (see FIG. 6) of a striker fixed to the vehicle body from an unlocked state in which the latch 30 is opened. Further, the vehicle latch device 1, as will be described later, by pulling the rod 7 0, and a latch 30 so that it can be unlocked by operating from the closed state to the open state.

  As shown in FIG. 2, the vehicle latch device 1 mainly includes a housing 2, a latch 30, a ratchet 40, a lever member 50, a rod 70, and a load receiving member 80. . In the following description of the configuration of the vehicle latch device 1, for the sake of convenience, the top, bottom, left, right, and front and rear directions indicated by arrows in FIG. 2 are used. Needless to say, it can be used in a posture.

  The housing 2 includes a resin resin housing 10 and a steel plate (metal) reinforcing plate 20 having a specific gravity larger than that of the resin but having a large elastic coefficient. In general, a robust vehicle latch device employed in a vehicle or the like is configured such that each member such as a steel latch is supported by a steel plate base. The vehicle latch device 1 is configured to reduce the weight significantly by adopting the resin casing 10 and to secure necessary rigidity and strength by partially providing the reinforcing plate 20.

  The resin casing 10 is integrally formed by connecting a tray-like lower case 10 </ b> A and an upper case 10 </ b> B that are open on one side by a hinge 19 formed of a thin portion. Such a resin casing 10 can be formed by integral molding with a set of molds. The upper case 10B can be rotated around the hinge 19 with respect to the lower case 10A, and is shaped like a box by matching the openings of the upper case 10B and the lower case 10A.

  The lower case 10A has a flat base portion 16A and a side wall portion 17A that rises at a part of the outer edge of the base portion 16A and is formed in a tray shape. An entry groove 15A corresponding to the entry groove 2A is formed on the lower edge of the base portion 16A. Further, from the base portion 16A, the cylindrical first shaft 11 and the second shaft 12 extend inward on the left and right sides of the entrance groove 15A and slightly apart upward from the entrance groove 15A. Both the first shaft 11 and the second shaft 12 are integrated with the base portion 16A.

  The first shaft 11 has a bolt hole 11H that is a through hole having a circular cross section along the axial direction. The second shaft 12 also has a bolt hole 12H that is a through hole having a circular cross section along the axial direction. Both the bolt hole 11 </ b> H and the bolt hole 12 </ b> H have substantially the same diameter as the shaft portion 91 of the bolt 90.

  Around the first shaft 11 in the base portion 16A, two first ribs 14P and 14Q are formed so as to protrude toward the inside of the resin casing 10 in an arc shape centering on the first shaft 11 (see FIG. (See also 3). The first ribs 14P and 14Q are formed in a range facing the operating latch 30. A second rib 14R is also formed around the second shaft 12 in the base portion 16A so as to project toward the inside of the resin casing 10 in an arc shape centered on the second shaft 12 (see also FIG. 3). . The second rib 14R is formed in a range facing the ratchet 40 that operates.

  On the outer side of the lower case 10A, as shown in FIG. 5A, there are provided reinforcing projections 20 and positioning protrusions 11J and 12J for positioning in the vertical and horizontal directions at the edges of the bolt holes 11H and 12H. In addition, a recess 18 is formed at the innermost edge of the entrance groove 15A by being thin and recessed from the other outer surface. An engagement hole penetrating the base portion 16A is formed at the upper end of the recess 18. 18P is formed.

  The upper case 10 </ b> B is configured substantially symmetrically with the lower case 10 </ b> A with respect to the hinge 19 with respect to the inside of the resin casing 10 except that the first shaft 11 and the second shaft 12 are not provided. As shown in FIG. 2, the upper case 10B includes a flat base portion 16B and a side wall portion 17B that rises at a part of the outer edge of the base portion 16B and is formed in a tray shape. An entry groove 15B corresponding to the entry groove 2A is formed on the upper edge (lower side after assembly) of the base portion 16B. Also, the base portion 16B is formed on the left and right sides of the entry groove 15B with a small distance from the entry groove 15A to the lower side (the upper side after assembly), and bolt holes 13P and 13Q corresponding to the bolt holes 11H and 12H, respectively. ing.

  Around the bolt hole 13P in the base portion 16B, two first ribs 14S and 14T are formed in an arc shape with the bolt hole 13P as the center, toward the inside of the resin casing 10, symmetrically with the first ribs 14P and 14Q. Protrusively formed. In addition, the second rib 14U is formed around the bolt hole 13Q in the base portion 16B so as to project inward toward the inside of the resin casing 10 in an arc shape centering on the bolt hole 13Q, symmetrically with the second rib 14R. ing.

  As shown in FIGS. 2 and 5A, the reinforcing plate 20 is formed so as to cover the outside of the lower case 10 </ b> A except for a part of the upper portion, and has a flat base portion 21 and a base portion 21. Side walls 27 rising from the left and right ends of the outer edge toward the inside are provided. Although not shown in detail, the side wall 27 of the reinforcing plate 20 can be temporarily assembled with the lower case 10A by engaging with the side wall 17A of the lower case 10A.

  Positioning holes 22 and 23 are formed in the base portion 21 so as to correspond to the positioning protrusions 11J and 12J of the lower case 10A. Further, an entry groove 25 corresponding to the entry groove 2 </ b> A is formed at the lower edge of the base portion 21.

  As shown in FIG. 5A, a flange 28 that is bent and raised toward the outside is formed on the outer edge of the reinforcing plate 20. The flange 28 is a part that contacts the load receiving member 80 and supports the force received by the load receiving member 80 from the rod-like portion P1 (see FIG. 6) of the striker P. The flange 28 is provided at the bottom of a recess 29 provided in the upper portion in the outline of the reinforcing plate 20 when viewed from the axial direction of the first shaft 11, that is, facing the base portion 21. By providing the flange 28 using such a recess 29 of the reinforcing plate 20, the size of the reinforcing plate 20 can be reduced, and the plate of the reinforcing plate 20 can be made efficient.

  The latch 30 is a member that engages and disengages the rod-like portion P1 of the striker P and locks or unlocks the vehicle latch device 1. As shown in FIG. 2, the latch 30 is formed by punching a thick metal plate, has a first hole portion 31 that penetrates in the thickness direction, and the first hole portion 31 fits outside the first shaft 11. Thus, the resin casing 10 is rotatably supported. Specifically, the latch 30 includes a metal latch body 30A, and a resin cover 30B that covers a part of the front surface and side edges of the latch body 30A. The cover 30 </ b> B is provided to improve the slidability with the ratchet 40.

The latch 30 has a groove 32 that engages with the rod-shaped portion P <b> 1, and a portion that forms the outside of the groove 32 is a hook-shaped portion 33. In addition, the latch 30 is formed with a lock recess 34 that is recessed so as to approach the first hole 31 at the upper right edge in the posture of FIG. 6. An outer peripheral portion adjacent to the left side of the lock recess 34 is an opening contact surface 35 that the ratchet 40 contacts to maintain the latch 30 in an open state when the latch 30 is opened. The open contact surface 35 is a convex curved surface toward the outside, and the direction from the outer peripheral surface toward the center of the curvature circle (in FIG. 6) in the entire range where the lock engaging portion 42A of the ratchet 40 described later contacts. (See arrow) is shifted to one side, here right side, with respect to the axis of rotation of the latch 30. For this reason, the force received by the latch 30 from the lock engaging portion 42A acts to rotate the latch 30 in the clockwise direction, that is, toward the open state.
Further, since the latch 30 pivotally supports the lever member 50, a pin 36 protruding to the front side is press-fitted.

  The ratchet 40 is a metal substantially plate-like member, and the second hole portion 41 penetrating in the thickness direction is fitted to the outside of the second shaft 12 of the resin casing 10 to rotate to the resin casing 10. Supported as possible. The rotation axis of the ratchet 40 is parallel to the rotation axis of the latch 30. The ratchet 40 has a substantially fan-shaped main body portion 42 at the upper left of the second hole portion 41, and a lock engaging portion 42 </ b> A with which the lower left corner of the main body portion 42 contacts the latch 30. The lock engaging portion 42A enters the lock recess 34 of the latch 30 in the closed state of the latch 30 to maintain the closed state of the latch 30, and in contact with the open contact surface 35 in the open state of the latch 30. Functions to maintain state.

  An arm 43 that extends further upward is formed from the upper part of the main body portion 42, and a hook 44 is formed at the tip of the arm 43 to hook the right end of a tension spring 75 as an example of a biasing member. By engaging the end of the tension spring 75 with the hook 44 having the tip of the arm 43 shaped like a hook, another part such as a rivet is fixed to the arm 43 so that the end of the tension spring 75 is engaged. The number of parts can be reduced compared to the structure to be stopped. Further, a hole 48 is formed in the arm 43 as shown in FIG. 2, and a rod 70 for operating the vehicle latch device 1 from the locked state to the unlocked state is coupled to the hole 48 so as to be swingable by a rivet 71. Has been.

  As shown in FIG. 6, a pin 45 projecting forward is press-fitted to the right side of the lock engaging portion 42 </ b> A in the main body portion 42. As shown in FIG. 2, the ratchet 40 has a flange 47 that protrudes forward in the axial direction of the hole around the second hole portion 41. The flange 47 protrudes in a size corresponding to the thickness of the lever member 50, and when the latch 30 is closed, the lever member 50 abuts against the flange 47 by the urging force of the tension spring 75, thereby preventing play of the lever member 50. It has come to be.

  The lever member 50 is an operation mechanism for interlocking the operation of the ratchet 40 with the latch 30. The lever member 50 is a long and thin plate-like member, and is supported by the latch 30 so that the hole 51 formed at substantially the center in the longitudinal direction fits the pin 36 of the latch 30.

In the posture of FIG. 6, the lever member 50 has an operation arm 52 extending from the rotation shaft toward the lower right and an operation arm 53 extending upward. The operating arm 52 is formed with a deformed rectangular guide hole 52A. The pin 45 of the ratchet 40 enters the guide hole 52A. The distal end of the operating arm 52 is a stopper surface 52B that contacts the flange 47 of the ratchet 40 and prevents the lever member 50 from playing. A hook 54 is formed at the tip of the operation arm 53, and the left end of the tension spring 75 is hooked on the hook 54. The end of the tension spring 75 is secured to the operation arm 53 by locking the end of the tension spring 75 with a hook 54 having a hook-like shape at the tip of the operation arm 53. The number of parts can be reduced as compared with the structure that locks.

  In addition, when attaching the tension spring 75, it is preferable that the hook 44 and the hook 54 have the same height (position in the axial direction of the first shaft 11). Thus, in order to make the height of the hook 44 and the hook 54 coincide with each other, the thickness of the portion of the hook 44 is made different from the thickness of the main body portion 42 of the ratchet 40 or the vicinity of the tip of the operation arm 53 is bent. The height position of 54 may be adjusted.

  As described above, each end of the tension spring 75 is hooked on the ratchet 40 and the lever member 50, and applies a biasing force so as to always attract the main body 42 of the ratchet 40 and the operation arm 53 of the lever member 50. This urging force also acts to give a force for urging the lock engaging portion 42 </ b> A of the ratchet 40 toward the latch 30.

  The load receiving member 80 is a resin member that receives a load from the striker P in contact with the rod-like portion P1 of the striker P. As shown in FIG. 4, the load receiving member 80 mainly includes a rectangular main body portion 81 that spreads toward the end, and an engaging claw 82 that engages the resin casing 10 and the reinforcing plate 20. An end surface 81 </ b> A of the end portion of the main body 81 is a surface that contacts the flange 28 of the reinforcing plate 20 and transmits the load received from the striker P to the reinforcing plate 20. The end of the main body 81 opposite to the end surface 81 </ b> A is connected to the engaging claw 82 by a substantially semicircular connecting portion 83. Accordingly, as shown in FIG. 5B, the load receiving member 80 has a U-shaped cross section due to the main body portion 81, the connecting portion 83, and the engaging claw 82.

  An engaging projection 82A that engages with the engaging hole 18P of the lower case 10A protrudes on the opposite side of the main body 81 at the tip of the engaging claw 82. In addition, a substantially semicircular protrusion 84 similar to the connection portion 83 protrudes on the opposite side of the main body portion 81 at the base end of the engaging claw 82. The semicircular shape of the connecting portion 83 closely follows the shape of the innermost portion of the entry groove 25 of the reinforcing plate 20, and the semicircular shape of the protrusion 84 is the innermost portion of the entry groove 15A of the lower case 10A. It closely follows the shape. A resin sheet 89 excellent in slidability is attached to the end surface of the load receiving member 80 opposite to the end surface 81A. The surface of the resin sheet 89 is a load receiving surface 89A as an example of a load receiving portion in contact with the striker P. The load receiving surface 89A is disposed between the two bolts 90 when viewed from the direction of receiving the load from the rod-shaped portion P1 (from the bottom to the top in FIG. 6). As a result, the force received by the load receiving surface 89A is supported by the two bolts 90 in a well-balanced manner so that an unnecessary rotational moment is not generated in the vehicle latch device 1.

  As shown in FIG. 5B, when the lower case 10 </ b> A and the reinforcing plate 20 are in close contact with each other, there is a gap between the lower case 10 </ b> A and the reinforcing plate 20 due to the recess 18 of the lower case 10 </ b> A. It is like that. The load receiving member 80 is reinforced by inserting the engaging claw 82 into the gap between the recess 18 and the reinforcing plate 20 while inserting the reinforcing plate 20 between the main body 81 and the engaging claw 82. It arrange | positions so that the board 20 may be pinched | interposed. The engaging protrusion 82A at the tip of the engaging claw 82 enters and engages with the engaging hole 18P of the lower case 10A. The end surface 81A of the load receiving member 80 is in contact with the flange 28 of the reinforcing plate 20 so that the load from the striker P received by the load receiving surface 89A can be transmitted to the reinforcing plate 20.

  As shown in FIG. 7, the lower case 10 </ b> A and the upper case 10 </ b> B are fastened to each other by a bolt 90 to have a box shape, and are fixed to the bracket S <b> 2 together with the reinforcing plate 20. The bolt 90 includes a shaft portion 91, a screw portion 92 provided at the distal end of the shaft portion 91, and a flanged head 93 provided at the proximal end. The shaft portion 91 has a diameter larger than that of the crest portion of the screw portion 92, and receives a fastening force when the shaft portion 91 is fastened to the welding nut WN at the stepped portion. As a result, the cost can be reduced as compared to the case where a metal collar is used instead of forming the shaft portion 91 thick.

  Each of the lower case 10A and the upper case 10B is assembled into a box shape with the respective members such as the latch 30 assembled therein and the opening sides thereof facing each other, and the positioning protrusions 11J and 12J shown in FIG. Are fitted in the positioning holes 22 and 23 of the reinforcing plate 20, respectively. Thus, the resin casing 10 and the reinforcing plate 20 are positioned and combined. As shown in FIG. 7, in the vehicle latch device 1 assembled in this way, the shaft portion 91 of the bolt 90 is inserted into the bolt hole 11H, and the screw portion 92 is screwed into the welding nut WN of the bracket S2. This is fixed to the bracket S2. A spring washer 95 is interposed between the flanged head 93 and the reinforcing plate 20, and the vehicle latch device 1 is sandwiched between the bracket S 2 and the flanged head 93 by the elastic force of the spring washer 95. .

  Here, as can be seen from FIG. 7, the wall on one side of the housing 2 in the rotation axis direction of the latch 30 is constituted by the resin housing 10, and the outer wall of the other side is the reinforcing plate 20. It is comprised by. The reinforcing plate 20 functions as a seating surface that is located outside when the vehicle latch device 1 is attached to the frame S by the bolt 90 and receives the fastening force of the bolt 90. Thus, by positioning the reinforcing plate 20 on the outer side, it is possible to directly receive the fastening force by the reinforcing plate 20 and to protect the resin casing 10 from an external impact or the like. It has become. Here, the fastening state in the first shaft 11 by the bolt 90 has been described with reference to FIG. 7, but the fastening in the second shaft 12 by the bolt 90 is exactly the same. Therefore, the description of the fastening in the second shaft 12 is omitted.

The operation of the vehicle latch device 1 configured as described above will be described.
In the state before the operation of FIG. 6, the rod-like portion P1 of the striker P is in the deepest part of the entry groove 2A of the housing 2, and the hook-like portion 33 of the latch 30 holds the rod-like portion P1 from below. A lock engaging portion 42A enters the lock recess 34 of the latch 30 to restrict the rotation of the latch 30. That is, the latch 30 is in a closed state, and the vehicle latch device 1 is in a locked state. At this time, the tension spring 75 generates a tensile force, and the lock engaging portion 42 </ b> A of the ratchet 40 is in contact with the bottom of the lock recess 34. Further, the rod-like portion P1 of the striker P is in contact with the load receiving surface 89A of the load receiving member 80, and the load applied to the vehicle latch device 1 from the striker P via the load receiving member 80 is the flange 28 of the reinforcing plate 20. (Refer to FIG. 5 (a), (b)), and the reinforcing plate 20 receives.

  When the rod 70 is pulled from the state before the operation shown in FIG. 6, the vehicle latch device 1 first rotates the ratchet 40 clockwise as shown in FIG. 8, and the pin 45 of the ratchet 40 moves the guide hole 52A. The lever member 50 is rotated counterclockwise while the tension spring 75 is extended. In FIG. 8, there is almost no change from FIG. 6, but the force applied to the lever member 50 tries to rotate the latch 30 clockwise little by little via the pin 36.

  When the rod 70 is further pulled, as shown in FIG. 9, the ratchet 40 is further rotated clockwise, and the lock engaging portion 42 </ b> A is completely detached from the lock concave portion 34. Then, the latch 30 is rotated clockwise by the force received from the lever member 50 via the pin 36, and the lock engaging portion 42 </ b> A faces the open contact surface 35 of the latch 30.

  When the rod 70 is returned to the tension spring 75 from the state shown in FIG. 9, the lock engaging portion 42 </ b> A of the ratchet 40 comes into contact with the open contact surface 35 of the latch 30 as shown in FIG. 10. . At this time, the force with which the ratchet 40 pushes the latch 30 is directed from the contact point between the lock engaging portion 42A and the open contact surface 35 toward the center of curvature of the open contact surface 35, as indicated by a thick arrow in FIG. Since the center of curvature of the open contact surface 35 is shifted to the right with respect to the center of rotation of the latch 30 within the range of contact with the lock engaging portion 42A, the ratchet 40 pushes the latch 30 by the biasing force of the tension spring 75. The force acts as a force (rotational moment) that rotates the latch 30 clockwise, that is, toward the open state.

  Therefore, when the latch 30 rotates clockwise while the opening contact surface 35 slides on the lock engaging portion 42A due to this rotational moment, the latch 30 is opened as shown in FIG. 11, and the rod-like portion P1 of the striker P is opened. Can be detached from the entry groove 2A. That is, the vehicle latch device 1 is unlocked.

  When returning the vehicle latch device 1 from the unlocked state to the locked state, the rod-like portion P1 of the striker P enters the entrance groove 2A from the state shown in FIG. Turn counterclockwise. Then, the lock engaging portion 42A that has been in contact with the open contact surface 35 slides on the open contact surface 35, and when the latch 30 is sufficiently rotated, the lock engaging portion 42A is locked by the urging force of the tension spring 75. It enters the recess 34. That is, it returns to the locked state of FIG.

  In the process of the above operation, the vehicle latch device 1 according to the present embodiment is supported by the resin casing 10 so that the latch 30, ratchet 40 and lever member 50 can be rotated. Sometimes the sound caused by the friction of these components with the housing does not become a metallic sound, and noise can be suppressed. Further, since the sliding of the resin casing 10 and the latch 30, the ratchet 40, and the lever member 50 is not the friction between the metals but the friction between the metal and the resin, a smooth operational feeling can be obtained.

  In particular, the vehicle latch device 1 of the present embodiment includes a first hole 31 of the latch 30 and a second hole of the ratchet 40, respectively, by the first shaft 11 and the second shaft 12 formed integrally with the resin housing 10. Since the part 41 is supported, there is no contact between metals, a metal sound is eliminated, and a smooth operating feeling can be obtained. Further, first ribs 14P, 14Q, 14S, 14T and second ribs 14R, 14U along the rotation direction of the latch 30 and the ratchet 40 are formed on the inner surface of the resin casing 10, and the latch 30 and the ratchet 40 are Since the sliding is performed by the inner surface of the resin casing 10 and these ribs, the operating sound of the vehicle latch device 1 can be reduced, the sliding resistance can be reduced, and a good operating feeling can be obtained. Furthermore, since the latch 30 has a resin cover 30B on the side that slides with the ratchet 40, the contact between the metal of the latch 30 and the ratchet 40 is suppressed, so that the metal sound is suppressed and smooth operation is achieved. A feeling can be obtained.

  Further, since the resin casing 10 has a specific gravity smaller than that of a conventional base formed of a steel plate, the vehicle latch device 1 can be reduced in weight. And the above-mentioned 1st axis | shaft 11 and the 2nd axis | shaft 12 are made into a cylindrical shape, the change of the thickness of the resin housing | casing 10 is decreased, and the precision of shaping | molding has improved. Furthermore, the strength reduction due to the first shaft 11 and the second shaft 12 being cylindrical, and the shaft portion 91 of the bolt 90 is fitted therein to reinforce each shaft to a solid structure, Sufficient rigidity can be ensured. And since the member for comprising this solid structure uses the volt | bolt 90 which is components required in order to fasten the vehicle latch apparatus 1 to the flame | frame S which is another apparatus, separate parts are used. The number of parts can be reduced as compared with the case of use, so that the cost can be reduced and the weight of the vehicle latch device 1 can be reduced.

  Since the shaft that supports the latch 30 and the ratchet 40 is made of resin, there is a possibility that the shaft may be worn when the lever member 50 is directly applied to the shaft in order to prevent play of the metal lever member 50. In the vehicle latch device 1 of this embodiment, the flange 47 is provided around the second hole 41 of the ratchet 40 so that the lever member 50 is brought into contact with the outer periphery of the flange 47, so that the resin shaft is prevented from being worn. In addition, the play of the lever member 50 can be prevented to prevent unnecessary noise from being generated.

  In the vehicle latch device 1 according to this embodiment, when the lock engaging portion 42A of the ratchet 40 is in contact with the open contact surface 35 of the latch 30, this contact force rotates the latch 30 toward the open state. Since it works so as to be moved, it is possible to prevent the latch 30 from stopping in an unexpected posture.

  Further, since the reinforcing plate 20 constitutes the entry groove 2A (25) for guiding the rod-like portion P1, the resin casing 10 is adopted while suppressing the wear of the entry groove 2A due to the operation of the vehicle latch device 1. As a result, it is possible to suppress a decrease in durability. Moreover, the rigidity reduction of the housing | casing 2 by employ | adopting the resin housing | casing 10 is reinforced with the reinforcement board 20 which partially covers the resin housing | casing 10, and the required rigidity is also ensured.

  And since the lower case 10A and the upper case 10B are connected integrally by the hinge 19, the resin housing | casing 10 can be shape | molded at once, and cost reduction is possible. Further, when the vehicle latch device 1 is assembled, since the orientations of the lower case 10A and the upper case 10B are determined by the hinge 19, the contents of the lower case 10A are sequentially assembled to the upper case. Productivity is very good because 10B can be closed without worrying about its orientation.

  The vehicle latch device 1 of this embodiment includes a resin load receiving member 80, and the load receiving member 80 is in direct contact with the rod-like portion P1 of the striker P. The load can be received softly to improve the operational feeling. The load receiving member 80 is engaged with both the reinforcing plate 20 and the resin casing 10, but the engagement claw 82 is engaged with an engagement hole 18 </ b> P provided in the resin casing 10. Therefore, it is not necessary to form the engagement hole 18P in the reinforcing plate 20 made of a steel plate, and manufacturing is easy. Further, since the load receiving surface 89A of the load receiving member 80 is disposed between the centers of the bolts 90 in the direction connecting the centers of the bolts 90 when viewed from the axial direction of the first shaft 11, the load receiving surface 89A. Can be supported by the two bolts 90 in a well-balanced manner, and an unnecessary rotational moment can be prevented from being generated in the vehicle latch device 1.

  The vehicle latch device 1 according to the present embodiment is positioned by the engagement between the positioning protrusions 11J and 12J provided on the resin casing 10 and the positioning holes 22 and 23 of the reinforcing plate 20, Since the positioning protrusions 11J and 12J are provided at the edge of the hole through which the bolt 90 passes, the configuration is simpler than that provided with a separate positioning protrusion and hole, and the positioning protrusions 11J and 12J and the positioning protrusion 11J are positioned. Engagement with the holes 22 and 23 is ensured.

  Further, since the flange 28 of the reinforcing plate 20 is provided in the concave portion 29 in the outline of the reinforcing plate 20 when viewed from the axial direction of the first shaft 11, it is possible to realize the downsizing of the reinforcing plate 20 and the efficiency of plate cutting. . Further, since the reinforcing plate 20 is located on the outside when the vehicle latch device 1 is attached to the frame S, the reinforcing plate 20 can directly receive a fastening force by the reinforcing plate 20 and from an external impact or the like. The resin casing 10 can be protected.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified and implemented.
For example, in the above-described embodiment, the shaft that pivotally supports the latch 30 or the ratchet 40 is configured integrally with the resin casing 10, but the shaft itself may be a metal shaft. Also, when a resin shaft is employed, it may be employed for only one of the latch 30 and the ratchet 40.

  In the embodiment described above, the lower case 10A and the upper case 10B are integrally formed by the hinge 19, but they may be formed separately.

  In the above-described embodiment, an example of a specific fixing structure of the vehicle latch device 1 using the two bolts 90 has been described. However, the fixing structure is not limited to that illustrated. That is, the fastening member may be a rivet instead of a bolt, and the portion where the fastening member fixes the vehicle latch device is not limited to the portion of the resin shaft as illustrated.

  In the embodiment, the engagement hole 18P with which the engagement claw 82 engages is a through hole, but the engagement hole may be a concave hole.

In the embodiment, the lower case 10A and the upper case 10 B, which had been both formed in a tray shape, or one of the other in the tray-like be formed in a plate shape.

  Furthermore, the vehicle latch device 1 may be provided not only when used for the backrest of a vehicle seat such as a vehicle, but also for a seat or a leg of the vehicle seat. It can also be used as a locking device. The vehicle seat may also be a ship or airplane seat other than a vehicle.

DESCRIPTION OF SYMBOLS 1 Vehicle latch apparatus 2 Housing | casing 2A Entrance groove 10 Resin housing | casing 10A Lower case 10B Upper case 11 1st axis | shaft 11H Bolt hole 11J Positioning protrusion 12 2nd axis | shaft 12H Bolt hole 13P Bolt hole 13Q Bolt hole 14P, 14Q, 14S, 14T first rib 14R, 14U second rib 15A entry groove 15B entry groove 18 recess 18P engagement hole 19 hinge 20 reinforcing plate 21 base portion 22 positioning hole 25 entry groove 28 flange 29 recess 30 latch 30A latch body 30B cover 31 first Hole portion 32 Groove 33 Gutter-shaped portion 34 Lock recess 35 Open contact surface 40 Ratchet 41 Second hole portion 42 Main body portion 42A Lock locking portion 47 Flange 50 Lever member 52B Stopper surface 70 Rod 75 Tension spring 80 Load receiving member 82 Engagement Joint claw 82A Engagement protrusion 89 The load bearing surface 90 volts P striker P1 rod portion S frame S1 side frame S2 brackets WN welding nuts

Claims (10)

A vehicle latch device that locks or unlocks by engaging or disengaging from a rod-shaped part,
A housing,
A latch that is housed in the housing and is rotatably supported by the housing and has a metal bowl-shaped portion that can be engaged with the rod-shaped portion;
The housing has a first wall facing the latch on one side in the rotation axis direction of the latch with respect to the latch, and a second wall facing the latch on the other side in the rotation axis direction with respect to the latch. And have a wall
It said first wall and said second wall, Ri both resin der,
The housing is accommodated in the housing and is rotatably supported by the housing, and is engaged with the latch so that the latch can be engaged with the rod-shaped portion and opened to be detached from the rod-shaped portion. A metal ratchet to maintain the condition,
A metal lever member that is rotatably supported by the latch and that is engaged with the ratchet to transmit the operation of the ratchet to the latch;
A biasing member that engages the lever member and the ratchet;
The housing integrally has a second shaft protruding inward,
The ratchet includes a second hole that fits into the second shaft, and a flange that protrudes in the axial direction of the second hole around the second hole,
The ratchet is rotatably supported by the housing by the engagement of the second shaft and the second hole, and the lever member is configured so that when the latch is in a closed state, A vehicle latch device which is in contact with the flange by an urging force .   2. The vehicle latch device according to claim 1, wherein the casing is formed in a box shape by combining two members, and the two members are integrally formed by being connected by a hinge. The housing integrally has a first shaft protruding inward,
The latch has a first hole that fits into the first shaft,
3. The vehicle latch device according to claim 1, wherein the latch is rotatably supported by the housing by the engagement of the first shaft and the first hole portion. The first shaft is formed in a cylindrical shape,
4. The vehicle latch device according to claim 3, further comprising a metal first fastening member that penetrates the inside of the cylinder of the first shaft and fixes the vehicle latch device to another device. 5. The second shaft is formed in a cylindrical shape,
4. The device according to claim 1 , further comprising a second metal fastening member that penetrates the inside of the cylinder of the second shaft and fixes the vehicle latch device to another device . 5. The vehicle latch device according to the item .   4. The vehicle latch device according to claim 3, wherein the housing includes a first rib protruding toward the inside of the housing around the first shaft. 5. Before Kikatamitai is formed in a box shape by combining two members, the two members are integrally formed connected by a hinge,
Wherein the first wall has a second axis and the first axis inwardly projecting integrally
The latch has a first hole that fits into the first shaft,
The latch is rotatably supported by the housing by the engagement of the first shaft and the first hole ,
Before Stories second wall has a first hole into which the metal of the first fastening member for fixing the vehicle latch device to another device, the metal of the second fastening member for fixing the vehicle latch device to another device A second hole through which
The tip of the first shaft is in contact with the edge of the first hole,
2. The vehicle latch device according to claim 1, wherein a tip end of the second shaft is in contact with an edge of the second hole. A vehicle latch device that locks or unlocks by engaging or disengaging from a rod-shaped part,
A housing,
A latch that is housed in the housing and is rotatably supported by the housing and has a metal bowl-shaped portion that can be engaged with the rod-shaped portion;
The housing is made of resin;
The housing is accommodated in the housing and is rotatably supported by the housing, and is engaged with the latch so that the latch can be engaged with the rod-shaped portion and opened to be detached from the rod-shaped portion. A metal ratchet to maintain the condition,
A metal lever member that is rotatably supported by the latch and that is engaged with the ratchet to transmit the operation of the ratchet to the latch;
A biasing member that engages the lever member and the ratchet;
The housing integrally has a second shaft protruding inward,
The ratchet includes a second hole that fits into the second shaft, and a flange that protrudes in the axial direction of the second hole around the second hole,
The ratchet is rotatably supported by the housing by the engagement of the second shaft and the second hole, and the lever member is configured so that when the latch is in a closed state, A vehicle latch device which is in contact with the flange by an urging force. 9. The vehicle latch device according to claim 8 , wherein the casing is formed in a box shape by combining two members, and the two members are integrally formed by being connected by a hinge. The housing integrally has a first shaft protruding inward,
The latch has a first hole that fits into the first shaft,
The vehicle latch device according to claim 8 or 9 , wherein the latch is rotatably supported by the housing by the engagement of the first shaft and the first hole.

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