JP4777635B2 - Reclining device - Google Patents

Description

  The present invention provides a lower arm provided on the seat cushion side and a lower arm provided rotatably on the lower arm, provided on one of the upper arms provided on the seat back side, and a plane parallel to the rotation plane of the upper arm A pole having an inner tooth formed on the circumference centering on the rotation center axis of the upper arm, and an outer tooth provided on either the lower arm or the upper arm and meshable with the inner tooth And provided on the other of the lower arm and the upper arm, and guiding the pole in a radial direction of a circle around the rotation center axis of the upper arm on a plane parallel to the rotation plane of the upper arm. A guide for engaging / separating the external teeth of the pole with the internal teeth, and moving the pole in a direction in which the external teeth of the pole are separated from the internal teeth. It relates reclining device having a release means for.

  As a reclining device, there exists a thing of a structure as shown in FIGS. 7-9, for example. 7 is a partially cutaway view of a conventional reclining device, FIG. 8 is a cross-sectional view taken along a cutting line AA in FIG. 7, and FIG. In these drawings, a ratchet 5 provided on the upper arm on the seat back side is rotatably attached to the base plate 1 provided on the lower arm on the seat cushion side via a hinge pin 3. Inner teeth 7 are formed on the ratchet 5 on a circumference around the hinge pin 3 that is the rotation center axis of the upper arm on a plane parallel to the rotation plane of the ratchet 5 (upper arm).

  Between the base plate 1 and the ratchet 5, a pole 11 having external teeth 9 that can mesh with the internal teeth 7 is disposed. On the base plate 1, the pole 11 is guided in a radial direction of a circle around the hinge pin 3 that is the rotation center axis of the upper arm on a plane parallel to the rotation plane of the ratchet 5 (upper arm). Guides 13 and 13 ′ for engaging / separating 9 with the internal teeth 7 are formed.

  Further, a cam 15 is attached to the hinge pin 3 so as to rotate integrally with the hinge pin by pushing the back portion of the pole 11 and meshing the outer teeth 9 of the pole 11 with the inner teeth 7 of the ratchet 5. Further, the cam 15 is engaged with the outer end of a spiral spring 17 whose inner end is locked to the base plate 1, and the cam 15 is in a direction in which the outer teeth 9 of the pole 11 mesh with the inner teeth 7 of the ratchet 5. It is biased in the (locking direction).

  The disc-shaped release plate 21 having a hole through which the hinge pin 3 is inserted is arranged so as to be laminated with the cam 15, the pole 11, and the guides 13 and 13 'in the axial direction of the hinge pin 3. On the other hand, the cam 15 is formed with a protrusion 15a that can be fitted into the hole 21a of the release plate 21, so that the release plate 21 and the cam 15 rotate together.

  A convex portion 11 a that engages with a cam groove 21 b formed in the release plate 21 is formed on a surface parallel to the rotation plane of the ratchet 5 (upper arm) of the pole 11. The shape of the cam groove 21b is set to a shape that causes the external teeth 9 of the pole 11 to move away from the internal teeth 7 of the ratchet 5 when the release plate rotates counterclockwise in FIG. For example, see Patent Document 1).

  As a mechanism for moving the external teeth of the pole in a direction away from the internal teeth without using a release plate, there is a mechanism as shown in FIG. In the figure, a pole 33 disposed between the base plate 41 and the ratchet 37 is engaged with / disengaged from the outer teeth 35 of the pole 33 with the inner teeth 39 of the ratchet 37 by guides 45 and 45 ′ formed on the base plate 41. Guided in the direction.

The cam 31 is formed with an arm portion 31a that can be engaged with a groove portion 33a formed on the back portion of the pole 33, and when releasing the lock, the cam 31 is rotated counterclockwise in the figure. The outer teeth 35 of the pole 33 are moved away from the inner teeth 39 of the ratchet 37 (see, for example, Patent Document 2).
JP 2001-87071 A (FIGS. 1 to 3) JP 2001-87069 A (FIG. 4)

However, the reclining device shown in FIGS. 7 to 9 and the reclining device shown in FIG. 10 have the following problems.
(1) Reclining device shown in FIGS. 7 to 9 A portion S where the cam groove 21b of the release plate 21 and the convex portion 11a of the pole 11 abut in the rotational axis direction of the upper arm (axial direction of the hinge pin 3) (see FIG. 8). ) And the position K (see FIG. 8) where the external teeth 9 of the pole 11 and the internal teeth 7 of the ratchet 5 mesh.

Therefore, when the release plate 21 is used to move the external teeth 9 of the pole 11 away from the internal teeth 7 of the ratchet 5 (unlocking operation), the direction M (FIG. 8) causes the pole 11 to float from the upper arm rotation plane. (See below) occurs and the unlocking feeling is not good.
(2) Reclining device shown in FIG. 10 In the rotation axis direction of the upper arm, the arm 31a of the cam 31 and the groove 33a of the pole 33 contact each other, and the external teeth 35 of the pole 33 and the internal teeth 39 of the ratchet 37. It coincides with the meshing location.

  By the way, the guides 45 and 45 'of such a reclining device not only guide the pole 33 but also when the forward or backward force acts on the upper arm in the event of a vehicle collision or the like, It is also a part that prevents the engagement between the teeth 35 and the inner teeth 39 of the ratchet 37 from being released. Therefore, a predetermined strength is required.

  However, of the guides 45 and 45 ′, the guide 45 ′ is smaller than the guide 45 in order to prevent interference with the arm portion 31 a of the cam 31, and it is difficult to ensure a predetermined strength of the guide 45 ′.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a reclining device that has a good unlocking operation feeling and can ensure strength.

The invention according to claim 1 for solving the above problem is provided in either one of the lower arm provided on the seat cushion side, the upper arm provided rotatably on the lower arm, and provided on the seat back side, An inner tooth formed on a circumference centering on the rotation center axis of the upper arm on a plane parallel to the rotation plane of the upper arm, and provided on either the lower arm or the upper arm; A pole having external teeth that can mesh with teeth; and provided on the other of the lower arm and the upper arm, the pole is centered on the rotation center axis of the upper arm on a plane parallel to the rotation plane of the upper arm. and then guided in the radial direction of the circle was a guide for meshing / separating the external teeth of the pawl in said tooth surface and said outer teeth provided Press the pressed surface of the pole that direction, a cam which is meshed with external teeth of said pawl in said teeth, and energizing means external teeth of the pole for urging the pole in a direction meshing with said internal teeth A release means for moving the pole in a direction in which the external teeth of the pole move away from the internal teeth, wherein the release means is arranged in the axial direction of the rotation center axis of the upper arm, the pole, A release plate which is disposed at a position where it is laminated with the guide, and is provided so as to be rotatable around a rotation center axis of the upper arm, and is formed with a protrusion protruding toward the rotation plane of the upper arm of the pole; in the rotation plane parallel to the plane of the upper arm of the pawl, the said external teeth are formed between the pressed surface, the convex portion of the release plate abutment Friendly And a recess having a side wall surface configured to move the pole in a direction in which the outer teeth of the pole move away from the inner teeth by rotating the release plate. It is.
The invention according to claim 2 is the reclining device according to claim 1, wherein the convex portion is provided at a rotation end portion of the release plate.

Usually, the external teeth of the pole mesh with the internal teeth by the urging force of the urging means, and the upper arm is prohibited from rotating with respect to the lower arm (locked state).
When the release plate is rotated against the urging force of the urging means, the convex portion of the release plate comes into contact with the side wall surface of the concave portion of the pole, and the pole moves in a direction in which the outer teeth of the pole are separated from the inner teeth, The upper arm can rotate with respect to the lower arm (unlocked state).

After releasing the force to operate the release plate after rotating the upper arm to the desired position, the pole is guided and moved by the urging force of the urging means, and the outer teeth of the pole mesh with the inner teeth, The rotation of the upper arm relative to the lower arm is again prohibited.
In addition, the recessed part in this specification means the groove | channel and hole which have a base, and the through-hole which does not have a base.

  According to the first aspect of the present invention, the release means is disposed at a position where the pole and the guide are stacked in the axial direction of the rotation center axis of the upper arm and is centered on the rotation center axis of the upper arm. A release plate that is rotatably provided and formed with a projection that protrudes toward a rotation plane of the upper arm of the pole, and a plane parallel to the rotation plane of the upper arm of the pole. A convex portion is abuttable and comprises a concave portion having a side wall surface that is set in a shape that moves the pole in a direction in which the outer teeth of the pole move away from the inner teeth by rotating the release plate. In the direction of the rotation axis of the upper arm, the part where the convex part of the release plate abuts the side wall of the concave part of the pole, and the outside of the pole And a substantially same position as the meshing portion between the ratchet inner teeth.

  Therefore, when the release plate is used to move the external teeth of the pole away from the internal teeth of the ratchet (unlocking operation), there is no moment in the direction of lifting the pole from the upper arm rotation plane. Feeling is good.

  Further, since the release plate is disposed at a position where the pole and the guide are stacked in the axial direction of the rotation center axis of the upper arm, the release plate and the guide do not interfere with each other. Therefore, the strength of the guide can be easily secured.

  Embodiments of the present invention will be described with reference to FIGS. 1 is a view showing the appearance of the reclining device according to the present embodiment, FIG. 2 is a sectional view taken along the line CC in FIG. 1, FIG. 3 is a rear view of FIG. 1, and FIG. 5 is a cross-sectional view taken along the cutting line EE of FIG. 1, and FIG. 6 is a view with the release plate of FIG. 5 removed.

  As shown in FIG. 2, in the reclining device of this embodiment, the base plate 100 is attached to the lower arm 201 on the seat cushion side, and the ratchet 130 is attached to the upper arm 202 on the seat back side.

  As shown in FIGS. 1 to 4, a ratchet holding portion 100 b bent in the rotation axis direction of the base plate 100 is formed on the outer peripheral portion of the disk-shaped base plate 100, and further, the outer peripheral portion of the base plate 100 and the ratchet The disc-shaped base plate 100 and the disc-shaped ratchet 130 are joined to each other so as to be relatively rotatable by attachment brackets 205 provided on the outer periphery of the disc 130. The ratchet holding portion 100b prohibits the movement of the base plate 100 and the ratchet 130 in the direction orthogonal to the rotation axis, and the mounting bracket 205 prohibits the movement of the base plate 100 and the ratchet 130 in the rotation axis direction. A hole 101 and a hole 131 are formed in a portion through which the rotation center axis of the base plate 100 and the ratchet 130 passes, and a pin 120 is inserted through the hole 101 and the hole 131.

  As shown in FIGS. 2 and 4, a substantially circular recess 132 centering on the rotation center axis of the ratchet 130 is formed on the surface of the ratchet 130 facing the base plate 100. Internal teeth 133 are engraved.

  As shown in FIGS. 2 and 4, the concave portion 104 is also formed on the surface of the base plate 100 facing the concave portion 132 of the ratchet 130, and as shown in FIG. Guide protrusions 105 and 106 are projected toward the bottom, and guide protrusions 107 and 108 are projected toward the ratchet 130 at the bottom of the bottom surface.

  On the surface of the base plate 100 opposite to the ratchet 130 side, a plurality of coupling protrusions 100a for attaching to the lower arm 201 on the seat cushion side are on the same circumference centering on the hole 101 (center of tilting of the ratchet 130). Are arranged at equal intervals. On the other hand, on the surface of the ratchet 130 opposite to the base plate 100 side, a plurality of coupling protrusions 130a for attaching to the upper arm 202 on the seat back side have the same circle centered on the hole 131 (the tilting center of the ratchet 130). It is arrange | positioned at equal intervals on the circumference.

  As shown in FIG. 5, the pole 140 is sandwiched between the guide surfaces 105 a and 106 a of the guide protrusions 105 and 106, and is slidably guided in a direction orthogonal to the rotation center axis of the ratchet 130. The inner teeth 133 of the ratchet 130 can be engaged with each other.

  Similarly, the pole 150 is sandwiched between the guide surfaces 107 a and 108 a of the guide protrusions 107 and 108, and is slidably guided in a direction perpendicular to the rotation center axis of the ratchet 130, and the outer teeth 151 at the front end portion are formed inside the ratchet 130. It is configured to be able to mesh with the teeth 133.

  A cross-sectional oval portion 123 is formed in the intermediate portion of the pin 120, and an oval hole 171 of the cam 170 is fitted in the cross-sectional oval portion 123. For this reason, the cam 170 is fitted to the pin 120 in a relatively non-rotatable state.

  The cam 170 rotates together with the pin 120, and as shown in FIG. 6, three pressing portions 174a, 174b, 174c, 175a, 175b, and 175c are formed at the upper portion and three portions at the lower portion. Of the three pressing portions, the back portions 142 and 152 of the poles 140 and 150 are pushed in the direction of the external teeth 141 and 151 with the central pressing portions 174b and 175b, and the external teeth 141 and 151 of the poles 140 and 150 are ratchet. It meshes with 130 internal teeth 133. The remaining pressing portions 174a and 175a and the pressing portions 174c and 175c are set so as to come into contact when the poles 140 and 150 are tilted due to a collision or the like and prohibit further tilting of the poles 140 and 150. Yes.

  As shown in FIGS. 2, 4, and 5, in the axial direction of the pin 120 provided along the rotation center axis, the release plate 180 includes a cam 170, poles 140 and 150, guide protrusions 105, 106, 107, and so on. A hole 181 through which the pin 120 is inserted is formed at a position where it is stacked with the layer 108.

  As shown in FIGS. 5 and 6, the cam 170 is formed with protrusions 176 and 177 protruding toward the ratchet 130, and these protrusions 176 and 177 are formed at the edge of the hole 180 of the release plate 180 and are arranged in the radial direction. Are fitted into small elongated holes 182 and 183 extending to For this reason, the cam 170 and the release plate 180 rotate in conjunction with each other.

  As shown in FIGS. 2 and 5, the release plate 180 is formed with projections 183 and 184 that protrude toward the rotation plane of the ratchet 130 (upper arm) of the poles 140 and 150.

  On the other hand, as shown in FIGS. 2 and 6, the projections 183 and 184 of the release plate 180 are engaged with the surfaces parallel to the rotation plane of the ratchet 130 (upper arm) of the poles 140 and 150. By rotating, cam grooves 144 and 154 as concave portions having side walls set in a shape in which external teeth 141 and 151 of poles 140 and 150 move poles 140 and 150 away from internal teeth 133 of ratchet 130. Is formed.

  As shown in FIGS. 5 and 6, spiral springs 191 and 195 as urging means have inner ends hooked to hooks 111 and 112 of the base plate 100 and outer ends hooked to step portions 178 and 179 of the cam 170. The cam 170 is turned and biased so that the cam 170 pushes the back surface of the poles 140 and 150.

  The operation of the reclining device having the above configuration will be described. Normally, the cam 170 pushes the back surface of the poles 140 and 150 due to the urging force of the spiral springs 191 and 195, and the external teeth 141 and 151 of the poles 140 and 150 mesh with the internal teeth 133 of the ratchet 130. ) The rotation of 130 is prohibited (locked state).

  Here, when the pin 120 is rotated and the cam 170 is rotated in the clockwise direction against the urging force of the spiral springs 191 and 195 in FIG. 6, the pressing of the cam 170 on the back surfaces of the poles 140 and 150 is released. At the same time, the projections 183 and 184 of the release plate 180 are guided by the cam grooves 144 and 154 of the poles 140 and 150, and the outer teeth 141 and 151 of the poles 140 and 150 are separated from the inner teeth 133 of the ratchet 130. The poles 140 and 150 are retracted, the meshing between the external teeth 141 and 151 of the poles 140 and 150 and the internal teeth 133 of the ratchet 130 is released, and the ratchet (seat back) 130 can be tilted (unlocked state). .

  When the seat back is tilted to a desired angle and the operation force to the pin 120 is released, the cam 170 pushes the back surface of the poles 140 and 150 by the biasing force of the spiral springs 191 and 195, and the external teeth 141 of the poles 140 and 150 , 151 meshes with the internal teeth 133 of the ratchet 130 again, and the ratchet (seat back) 130 returns to a state in which the rotation is prohibited.

According to such a configuration, the following effects can be obtained.
(1) In the axial direction of the rotation center axis, it is disposed at a position where the poles 140 and 150 and the guide protrusions 105 to 108 are stacked, and is provided to be rotatable around a pin 120 provided along the rotation center axis. A release plate 180 having projections 183 and 184 protruding toward the rotation plane of the ratchet 130 of the poles 140 and 150 and a plane parallel to the rotation plane of the ratchet 130 of the poles 140 and 150 are formed. When the projections 183 and 184 of the 180 are engaged and the release plate 180 is rotated, the external teeth 141 and 151 of the poles 140 and 150 are moved in a direction away from the internal teeth 133 of the ratchet 130. Rotation by providing cam grooves 144 and 154 as recesses having side wall surfaces set to Locations where the projections 183 and 184 of the release plate 180 abut the cam grooves 144 and 154 of the poles 140 and 150 in the axial direction of the central axis, the external teeth 141 and 151 of the poles 140 and 150, and the internal teeth of the ratchet 130 The position that meshes with 133 is substantially the same position.

  Accordingly, when the outer teeth 141 and 151 of the poles 140 and 150 are moved away from the inner teeth 133 of the ratchet 130 using the release plate 180 (unlocking operation), the poles 140 and 150 are moved from the rotation plane of the ratchet 130. Since there is no moment in the direction to lift, the unlocking feeling is good.

 (2) Since the release plate 180 is arranged at a position where the poles 140 and 150 and the guide protrusions 105 to 108 are stacked in the axial direction of the rotation center axis, the release plate 180 and the guide protrusions 105 to 108 interfere with each other. There is nothing. Therefore, the strength of the guide protrusions 105 to 108 can be easily ensured.

  The present invention is not limited to the above embodiment. For example, the ratchet 130 may be attached as a lower arm to the frame 201 on the seat cushion side, and the base plate 100 may be attached to the upper arm 202 on the seat back side. The number of poles (140, 150) may be one or more, and the biasing of the cam 170 is not limited to the method using the spiral springs 191, 195.

It is a figure which shows the external appearance of the reclining apparatus of this example. It is sectional drawing in the cutting line CC of FIG. It is a rear view of FIG. It is sectional drawing in the cutting line DD of FIG. It is sectional drawing in the cutting line EE of FIG. It is the figure which removed the release plate of FIG. It is a partially broken view of the conventional reclining device. FIG. 8 is a cross-sectional view taken along a cutting line AA in FIG. 7. FIG. 9 is a cross-sectional view taken along a cutting line BB in FIG. 8. It is a figure explaining another prior art example.

Explanation of symbols

120 pin 130 ratchet 133 inner tooth 140,150 pole 141,151 outer tooth 144,154 cam groove 180 release plate 183,184 convex part

Claims (2)

The lower arm provided on the seat cushion side, provided rotatably on the lower arm, provided on either one of the upper arms provided on the seat back side, on a plane parallel to the rotation plane of the upper arm, Internal teeth formed on the circumference around the rotation center axis of the upper arm,
A pole provided on either one of the lower arm and the upper arm and having external teeth that can mesh with the internal teeth;
Provided on the other of the lower arm and the upper arm, on a plane parallel to the rotation plane of the upper arm, guiding the pole in a radial direction of a circle around the rotation center axis of the upper arm, A guide for engaging / separating the external teeth of the pole with the internal teeth;
A cam that presses the pressed surface of the pole facing the surface on which the external teeth are provided, and meshes the external teeth of the pole with the internal teeth;
A biasing means for biasing the pole in a direction in which the outer teeth of the pole mesh with the inner teeth;
Release means for moving the pole in a direction in which the outer teeth of the pole are separated from the inner teeth;
In a reclining device having
The release means is:
In the axial direction of the rotation center axis of the upper arm, it is disposed at a position where it is stacked with the pole and the guide, and is provided to be rotatable around the rotation center axis of the upper arm, and the rotation plane of the upper arm of the pole A release plate formed with a convex portion protruding toward the
In a plane parallel to the rotation plane of the upper arm of the pole, formed between the external teeth and the pressed surface, the convex portion of the release plate can be contacted, and by rotating the release plate, A recess having a side wall set in a shape for moving the pole in a direction in which the outer teeth of the pole move away from the inner teeth;
A reclining device comprising: 2. The reclining device according to claim 1, wherein the convex portion is provided at a rotating end portion of the release plate.

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