JP2001164813A - Noise preventive device for vehicle door latch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the noise of a vehicle door latch device. SOLUTION: This noise preventive device door for vehicle door latch device comprises a resin body 1 for a door latch device mounted on a vehicle door; a recessed part 2 formed on the front side of the body 1; a metallic cover plate 41 substantially blocking the front side of the recessed part; and a metallic latch 3 rotatably housed in the recessed part 2, energized in the door opening direction by the elastic force of a coil spring 9, and rotated in the door closing direction against the elastic force of the coil spring 9 by the engagement with a striker 10 fixed to the car body when the door is closed. The outer surface of the latch 3 is covered with a resin film 29, the resin film 29 is partially swollen to form a protruding part 30, and a projection 31 protruded toward the latch 3 is formed on the circumferential surface of the recessed part 2, so that the protruding part 30 abut on the projection 31 of the body when the latch 3 is rotated in the door opening direction by the elastic force of the coil spring 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing abnormal noise of a vehicle door latch device.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventionally known Japanese Patent No. 292216 discloses a resin body a of a door latch device mounted on a vehicle door, a concave portion b formed on the front side of the body a, and A metal cover plate that substantially closes the front side of the concave portion b, and a striker e that is rotatably housed in the concave portion b and is urged in the door opening direction by the elastic force of the coil spring f to close the door when the door is closed; A metal latch d that rotates to close the door against engagement of the coil spring f when engaged.
The outer surface of the latch d is surrounded by a resin film c, and a part of the resin film c is bulged to form a convex portion g. The latch d rotates the door by the elasticity of the coil spring f. A description is given of a device for preventing abnormal noise of a vehicle door latch device in which the projection g contacts the peripheral wall h of the recess b.

[0003]

The above-mentioned known devices include two
There are two issues. The first is the shape of the peripheral wall h of the recess b. In the known device, when the door is opened, the convex portion g of the latch d collides with the peripheral wall h of the concave portion b to muffle the sound. However, since the peripheral wall h is formed on a flat surface, the convex portion g The door is opened and rotated while contacting not only at one point of the peripheral wall h but also over a certain width i as shown in FIG. For this reason, the operation of the latch d becomes heavy. The second is a through hole formed in the convex portion g of the latch d, which is a through hole opened on both the front side and the opposite side, so that pebbles or the like that can enter from between the cover plate and the concave portion. Foreign matter may fit in the hole in the convex part g and be clogged, and the sound deadening effect may be lost.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a door latch device mounted on a vehicle door, comprising a resin body 1, a recess 2 formed on the front side of the body 1, and a front side of the recess 2 substantially. When the metal cover plate 41 to be closed is rotatably housed in the recess 2 and is urged in the opening direction by the elastic force of the coil spring 9 and the door is closed, the elastic force of the coil spring 9 is established by engagement with the striker 10 fixed to the vehicle body. A metal latch 3 that rotates to close the door against the
Is surrounded by a resin film 29, and a part of the resin film 29 is bulged to form a convex portion 30.
The protrusion 3 protruding toward the latch 3
1, wherein the projection 30 contacts the projection 31 of the body 1 when the latch 3 opens and rotates due to the elasticity of the coil spring 9. It is.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes a body of a vehicle door latch device attached to a vehicle door side, and a concave portion 2 is provided on a front side of the body 1,
A latch 3 formed of a metal plate is pivotally supported on a latch shaft 4 above the recess 2. 5 is a striker engagement groove formed on the outer peripheral surface of the latch 3, 6 is a half latch engagement step, 7 is a full latch engagement step, 8 is an arc groove formed on the body 1, 9 is an arc groove Coil spring stored in 8, 1
Reference numeral 1 denotes a protrusion protruding into the arc groove 8 from the latch 3, reference numeral 10 denotes a striker fixed to the vehicle body side, reference numeral 12 denotes a ratchet supported by a ratchet shaft 13 at a lower position of the latch 3,
4 is a coil spring.

Reference numeral 15 denotes a claw portion of the ratchet 12 which engages with the half-latch engagement step 6 or the full-latch engagement step 7 by the elastic force of the coil spring 14, and 16 denotes an entry groove through which the striker 10 passes when the door is closed. , 18 are arc holes formed in the body 1, and 17 are connection projections provided on the ratchet 12, which project through the arc hole 18 to the back side of the body 1. A cover plate 41 made of a metal plate is provided on the front side of the body 1 to substantially close the recess 2.

The latch 3 is urged in the door opening direction by the resilience of the coil spring 9, and rotates by closing the door against the resilience of the coil spring 9 by engagement with the striker 10.

In FIG. 6, reference numeral 19 denotes an open plate which is supported by a shaft 20 on the back side of the body 1, and 21 denotes a rod which is supported by the left end of the open plate 19.
The rod 21 is connected to a door opening handle (not shown) of the door. Reference numeral 22 denotes an up-and-down moving rod pivotally supported at the left end of the open plate 19; 23, a contact portion formed at a part of the up-and-down moving rod 22;
Is a lock plate supported by a shaft 26 at the lower part of the body 1,
27 is a standing piece provided at the center of the lock plate 25;
Is an engagement protrusion provided at the upper end of the upright piece 27 and engages with the elongated hole 24.

The latch 3 is substantially entirely surrounded by a silencing resin film 29, and has a projection 30 bulging toward the peripheral wall 40 of the recess 2 in a part of the resin film 29.

A protrusion 31 protruding toward the latch 3 is integrally formed on the peripheral wall 40 of the concave portion 2. The projection 30 is configured to abut the projection 31. A through hole is formed in the convex portion 30 to provide elasticity, and the through hole is on the front side (the cover plate 41 side).
Is closed, but is a blind hole 32 in which an opening 33 facing the recess 2 is formed on the back side. In addition, as shown in FIG.
1 may be formed of an elastic body separate from the body 1, but acts similarly.

[0011]

When the door is moved in the direction of closing the door, the latch 3 of the latch device closes and rotates against the elasticity of the coil spring 9 by contact with the striker 10 on the vehicle body side. Accordingly, when the claw portion 15 of the ratchet 12 engages with the full latch engagement step 7 of the latch 3, the door closing is completed. When the door is opened, when the door opening handle is opened, the open plate 19 is turned to the left in FIG. 6 to move the vertically movable rod 22 downward, and the connecting projection 17 is lowered at the contact portion 23, so that the ratchet 12 is lowered. Then, the claw portion 15 is disengaged from the full latch engagement step portion 7 and the latch 3 becomes free, and the door is opened and rotated by the elastic force of the coil spring 9 to open the door.

However, when the door is opened as described above, in the known device, since the convex portion g of the latch d rotates while opening over the fixed width i of the peripheral wall h, the operation of the latch d becomes heavy. Also, a hole formed in the convex portion g of the latch d is
Since the through-hole is open to both the front side and the opposite side, foreign matter such as pebbles that can enter from between the cover plate and the concave part fits into the hole in the convex part g and loses the sound deadening effect. There is.

However, in the present application, when the latch 3 is opened by the resilience of the coil spring 9, the projection 30 of the latch 3 is brought into contact with the projection 31 formed on the body 1 so that the bulging members collide with each other. Therefore, the protrusion 30 rotates without colliding with the peripheral wall 40 of the recess 2 until the protrusion 30 abuts on the protrusion 31, and thus rotates slightly.

The bag hole 32 in the convex portion 30 is closed on the cover plate 41 side but open on the body 1 side, so that pebbles or the like which can enter from between the cover plate 41 and the concave portion 2 are provided. Foreign matter is prevented from fitting into the bag hole 32.

[0015]

As described above, according to the present invention, the resin body 1 of the door latch device attached to the vehicle door, the recess 2 formed on the front side of the body 1, and the front side of the recess 2 are substantially formed. A metal cover plate 41 is closed in the recess 2, and is rotatably housed in the recess 2, is urged in the door opening direction by the elastic force of the coil spring 9, and when the door is closed, the striker 10 fixed to the vehicle body engages with the coil spring 9. A metal latch 3 that rotates to close the door against elasticity, the outer surface of the latch 3 being surrounded by a resin coating 29 and
9, a projection 31 is formed on the peripheral wall 40 of the recess 2 by projecting toward the latch 3.
The projection 30 is brought into contact with the projection 31 of the body 1 when the latch 3 is opened and rotated by the resilience of the coil spring 9. Since the projection 30 rotates without colliding with the peripheral wall 40 of the recess 2 until the projection 30 hits the projection 31, the projection 30 rotates lightly. Further, according to the present invention, in the above device, a noise preventing device for a vehicle door latch device in which the cover plate 41 side is closed but the body 1 side is opened in the convex portion 30 is formed. Therefore, foreign matter does not clog the bag hole 32.

[Brief description of the drawings]

FIG. 1 is a diagram of a known example.

FIG. 2 is a front view of the latch device.

FIG. 3 is a diagram of a first embodiment.

FIG. 4 is a sectional view taken along line AA.

FIG. 5 is a diagram of a second embodiment.

FIG. 6 is a rear view of the latch device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... recessed part, 3 ... Latch, 4 ... Latch axis, 5
... Striker engaging groove, 6 ... Half latch engaging step, 7 ...
Full latch engagement stepped part, 8 ... arc groove, 9 ... coil spring, 1
0: striker, 11: protrusion, 12: ratchet, 13
... Ratchet shaft, 14 ... Coil spring, 15 ... Claw, 16
... Entry groove, 17 ... Connection projection, 18 ... Arc hole, 19 ... Open plate, 20 ... Shaft, 21 ... Rod, 22 ... Vertical moving rod, 23 ... Contact part, 24 ... Elongated hole, 25 ... Lock plate, 26 ... shaft, 27 ... standing piece, 28 ... engagement protrusion, 29 ...
Resin coating, 30 ... convex, 31 ... protrusion, 32 ... blind hole, 33
... opening, 40 ... peripheral wall, 41 ... cover plate.

Claims (2)

[Claims] 1. A resin body 1 of a door latch device mounted on a vehicle door, a recess 2 formed on the front side of the body 1, and a metal cover plate 41 for substantially closing the front side of the recess 2. A metal rotatably housed in the concave portion 2 and urged in the door opening direction by the elastic force of the coil spring 9 to close the door against the elasticity of the coil spring 9 by engagement with a striker 10 fixed to the vehicle body when the door is closed. Latch 3
The outer surface of the latch 3 is surrounded by a resin coating 29 and a part of the resin coating 29 is bulged to form a convex portion 30.
And a projection 31 protruding toward the main body 1. When the latch 3 opens and rotates due to the elasticity of the coil spring 9, the projection 30 comes into contact with the projection 31 of the body 1. Abnormal noise prevention device. 2. The body 1 according to claim 1, wherein the cover plate 41 side is closed in the projection 30.
An abnormal noise prevention device for a vehicle door latch device having a bag hole 32 opened on the side.