JP3812810B2 - Vehicle seat device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat device, and more particularly to a technique for eliminating backlash of a movable member that is rotatably supported by a fixed member.
[0002]
[Prior art]
For example, in a vehicle equipped with a seat belt, a submarine phenomenon may occur in which an occupant gets into the lower side of the waist belt when an impact is applied to the vehicle and the occupant restraint of the seat belt is reduced. The present applicant has previously proposed an occupant restraint device that projects a pipe built in a seat cushion upward when a vehicle impact occurs and restrains the thigh of the occupant backward (Japanese Patent Application No. 2001-138179). issue).
[0003]
The occupant restraint device as described above is required not to operate during normal use but to operate reliably and exhibit performance when an impact occurs. For this reason, in such a device, by designing with a clearance between the component parts, the parts do not interfere with each other even if the plate thickness and molding dimensions vary, and a smooth operation is always ensured. I am doing so. Further, by providing a clearance between parts, there is an advantage that the assemblability is improved.
[0004]
[Problems to be solved by the invention]
However, since the occupant restraint device as described above is provided in the vehicle seat, there are concerns about various adverse effects caused by the clearance provided between the components. In other words, taking into account the occupant's physique, sitting posture, occupant behavior such as getting on and off, movement during sitting, and the case where there is no occupant, the load input to the seat varies considerably. In addition, engine vibration during idling and acceleration, road surface conditions such as general roads and rough roads, and vehicle body vibration due to acceleration, deceleration and cornering, or resonance of such vibrations into the seat and occupant restraint system In consideration of this, the vibration acting on the occupant restraint device also varies considerably. Such loads and vibrations may cause subtle backlash when the sheet is used, or may generate hitting noises, squeaking noises, or fuzzing noises, thereby reducing the merchantability.
[0005]
Therefore, the present invention suppresses the occurrence of rattling and abnormal noise even when various loads and vibrations are applied, and can reliably maintain the operating performance when necessary, and can reduce such performance at a low cost. An object of the present invention is to provide a vehicle seat device that can be achieved with a simple configuration.
[0006]
[Means for Solving the Problems]
The vehicle seat device according to the present invention includes a fixed member fixed to the seat and a movable member rotatably provided on the fixed member. The movable member sandwiches the fixed member and rotates the movable member. A plate portion that is slidably contacted with the fixing member, and at least one of the plate portion and the fixing member is provided with a convex portion that elastically contacts the counterpart member. A gap is provided between the mating member, and at least one of the fixed member and the movable member is provided with a first member provided with a step portion projecting in a direction in which the plate portion is sandwiched, and on the one end side of the step portion. The second member that is in contact with one member and that forms another gap with the first member on the other end side of the step portion is formed separately from each other, and the step portion is separated from the convex portion. At the time of pressing against the mating member by the convex part The other end portion of the second member is characterized to be elastically deformed by the step portion as a fulcrum on the first member side within the other gap.
[0007]
In the vehicle seat device configured as described above, since the convex portion elastically contacts the mating member, the clearance provided between the members is absorbed. In addition, since the convex portion is in contact with the mating member and a gap is provided in the other portion, the frictional resistance is small, and therefore the movable member can be smoothly rotated to reliably perform the required function. Therefore, according to the present invention, even when various loads and vibrations are applied, the occurrence of rattling and abnormal noise is suppressed, and the operating performance can be reliably exhibited when necessary. Moreover, such a performance can be obtained simply by providing a convex portion, and is very inexpensive.
[0008]
Although the plate part which clamps a fixed member is provided in the movable member above, conversely, the plate part which clamps a movable member can be provided in a fixed member. That is, the vehicle seat device of the present invention includes a fixed member fixed to the seat and a movable member rotatably provided on the fixed member. The movable member is sandwiched between the fixed member and the movable member. By providing a plate portion that is in sliding contact with the movable member when rotating, and providing a convex portion that elastically contacts the mating member on at least one of the plate portion and the movable member, a portion other than the convex portion In this case, a gap is provided between the mating parts.
[0009]
Furthermore, in the vehicle seat device of the present invention, by providing another gap, the second member is easily elastically deformed by the convex portion being pressed by the counterpart member. Thereby, the elastic contact of a convex part and a counterpart member is maintained reliably, and generation | occurrence | production of a rattle or unusual noise can be suppressed more effectively.
[0010]
When providing another gap as described above, if the distance between the stepped portion and the convex portion is increased, the deformation resistance of the second member decreases, and conversely, if the distance is shortened, the deformation resistance of the second member increases. . Therefore, when used in a situation in which a considerably intense vibration occurs, it is possible to effectively suppress the occurrence of looseness and abnormal noise by shortening the distance between the stepped portion and the convex portion. In addition, it is preferable that step portions are provided on both side portions of the first member, and the pair of step portions and the convex portions are arranged so as to form an isosceles triangle having the convex portions as apexes. With this configuration, the elastic deformation of the second member can be made uniform.
[0011]
In addition, as means for bringing the convex portion into elastic contact with the mating member, the convex portion itself can be made of an elastic material instead of providing the other gap.
[0012]
The present invention can be applied to a seat occupant restraint device. For example, the fixed member is fixed to the seat cushion, and the movable member protrudes above the seat cushion by being rotated by a drive mechanism that is driven when a possibility of a vehicle collision or a vehicle collision is detected. It can be constituted as follows. Thereby, the movement to the front of a passenger | crew's buttocks at the time of a collision can be suppressed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A. Configuration of Embodiment An embodiment of the present invention will be described with reference to FIGS. This embodiment is an example in which the present invention is applied to an occupant restraint device. FIG. 1 is a perspective view showing a vehicle seat according to an embodiment. The seat 1 shown in the figure includes a cushion member 11 made of a foam material or the like and a seat frame 12 that supports the cushion member 11 in a seat cushion. A pair of subassemblies 2 a and 2 b constituting an occupant restraint device that cooperates with the seat belt 13 are attached to the left and right sides of the seat frame 12.
[0014]
As shown in FIGS. 2 and 3, the sub-assemblies 2 a and 2 b include arms (movable members) 6 that can rotate upward, and pipes 60 are installed on the free ends of the arms 6. ing. When there is a possibility of collision with the vehicle or when the vehicle collides, the pipe 60 pushes the cushion member 11 upward to support the occupant's thigh and suppress the forward movement of the buttocks and waist. It is supposed to be. In addition, the pipe 60 is deformed by an impact force received from the occupant and relieves the impact force.
[0015]
As shown in FIG. 1, a convex surface portion 64 is provided in front of the pipe 60 so as to form a surface substantially parallel to the upper surface of the cushion member 11 together with the upper surface of the pipe 60. The convex portion 64 prevents the pipe 60 from giving a foreign body feeling to the occupant's thigh when the occupant is seated on the seat 1.
[0016]
As shown in FIGS. 3 and 4A, the subassembly 2a on the right side in the traveling direction of the seat 1 has a substantially rectangular cylindrical casing (fixing member) 3 and a shaft at the front end of the casing 3. The arm 6 is rotatably supported by 33, a power generation mechanism 8 that rotates the arm 6 upward, and a one-way clutch 9 that prevents the arm 6 from returning downward. The left subassembly 2b includes almost the same components as the subassembly 2a except that the power generation mechanism 8 is not provided. Therefore, the components of the subassembly 2b are assigned the same reference numerals as those of the subassembly 2a, and detailed description thereof is omitted.
[0017]
As shown in FIG. 4A, the casing 3 includes a main body (first member) 30 having a U-shaped cross-section with one side surface opened, and a lid for closing the opening of the main body 30. Nail formed in the main body 30 after the power generation mechanism 8 and the one-way clutch 9 are accommodated in the main body 30 from the side, and then the opening is closed by the lid 50. These are fixed and held in the casing 3 by caulking 31.
[0018]
As shown in FIG. 6, the main body 30 and the lid 50 are curved along the contour of the cylinder 80 of the power generation mechanism 8. Further, the body portion 30 and the lid portion 50 are formed with holes 32 and 52 that are open to the side, and the flanges 81 and the one-way clutch 9 that are formed at the front end portion of the cylinder 80 are formed in the holes 32 and 52. Are engaged.
[0019]
As shown in FIG. 3, a mounting portion 53 projecting sideways is formed at the rear end portion of the lid portion 50, and a reinforcing member 54 is welded to the mounting portion 53. The mounting portion 53 and the reinforcing member 54 are fastened to the seat frame 12 by bolts, and the shaft 33 is fastened to the seat frame 12 by bolts 33a (shown in FIG. 5) passing therethrough.
[0020]
As shown in FIG. 7, the power generation mechanism 8 includes a cylinder 80 fixed to the casing 3, a piston 83 accommodated in an inner hole 82 of the cylinder 80, and a proximal end side of the piston 83. And a fixed gas generation mechanism 84. Between the piston 83 and the gas generation mechanism 84, a seal member 85 made of an elastic material and a coil spring 86 for biasing the base 83a of the piston 83 forward are interposed. In the figure, reference numeral 85a denotes an O-ring that seals between the base 83a and the inner peripheral surface of the cylinder 80.
[0021]
The one-way clutch 9 described above is provided at the front end of the power generation mechanism 8. The one-way clutch 9 includes an engagement piece 91 that selectively engages with a screw 83 b formed on the outer periphery of the piston 83 inside a casing 90 that is penetrated by the piston 83, and the engagement piece 91 that is connected to the base portion of the piston 83. The coil spring 92 is configured to be biased toward the 83a side. As shown in FIG. 7, the upper surface of the engagement piece 91 and the inner surface of the casing 90 are formed in a taper. As a result, when the piston 83 is moved forward, the engagement piece 91 moves forward and upward along the taper, whereby the engagement between the engagement piece 91 and the screw 83b is released. Conversely, when the piston 83 tries to move to the base 83a side, the engagement state between the engagement piece 91 and the screw 83b is maintained.
[0022]
Next, the arm 6 and the mounting structure between the arm 6 and the casing 3 will be described. The arm 6 has a U-shaped cross section provided with a pair of plate portions 61 parallel to each other, and sandwiches both side surfaces of the casing 3 by the plate portions 61. A hole 65 is formed in the base end portion of the plate portion 61. On the other hand, holes 35 and 55 are formed in the main body portion 30 of the casing 3 and the front end portion of the lid portion 50. These holes 65, 35, 55 are penetrated by the shaft 33, whereby the arm 6 is rotatably supported by the casing 3.
[0023]
The plate portion 61 of the arm 6 is formed with a long hole 67 that is positioned below the hole 65 and extends in the vertical direction. On the other hand, a hole 87 is formed in the front end portion of the piston 83, and long holes 37 and 57 extending in the front-rear direction are formed in the main body portion 30 and the lid portion 50 of the casing 3 at positions corresponding to the holes 87. Yes. The holes 87 and the long holes 67, 37, 57 are penetrated by the shaft 34, whereby the front end portion of the piston 83 is rotatably connected to the lower end portion of the arm 6. A washer 69 is fitted to the tip of the shaft 34, and the tip of the shaft 34 is caulked to prevent it from coming off.
[0024]
Next, features of the present invention shown in the subassembly 2b of FIG. 3 will be described. This feature does not appear in the subassembly 2a in FIG. 3, but this also has an equivalent configuration. As shown in the drawing, a pair of step portions 40 arranged in the vertical direction in FIG. 3 is formed at the edge portion forming the opening of the main body portion 30. As a result, the thickness H ₂ of the portion on the front end side of the step portion 40 of the main body 30 is smaller than the thickness H ₁ of the portion on the rear end side of the step portion 40. For this reason, in the state where the lid portion 50 is attached to the main body portion 30, as shown in FIG. 4A, the gap between the front end portion of the main body portion 30 and the lid portion 50 is (H ₁ -H ₂ ). 41 is formed.
[0025]
The thickness of the casing 3, a plus thickness t of the lid portion 50 to the thickness _{H 1 (H 1 + t)} . On the other hand, the inner dimension H ₃ between the plate portions 61 of the arm 6 is set slightly larger than the thickness (H ₁ + t) of the casing 3. That is, a clearance (gap) of C ₂ : (H ₃ −H ₁ −t) / 2 is provided between the casing 3 and the arm 6 on one side.
[0026]
Further, the front end portions of the main body portion 30 and the lid portion 50 are formed with convex portions 45 that protrude outward. The convex portion 45 is formed by projecting the main body portion 30 and the lid portion 50 in the thickness direction by press molding. As shown in FIG. A trapezoidal cross section formed by half blanking as shown in FIG. The height H ₄ of the convex portion 45 is slightly higher setting than the clearance C _2. For this reason, the front end portion of the casing 3 is pressed from both sides in accordance with a dimension (H ₄ -C ₂ ) in which the height H ₄ of the convex portion 45 exceeds the clearance C ₂ , whereby the lid portion 50 is It is elastically deformed around the portion connecting 40 and 40, and its front end is bent inward within the gap 41. That is, the convex portion 45 elastically contacts the plate portion 61 of the arm 6 when the lid portion 50 is bent.
[0027]
In FIG. 3, reference numeral 88 denotes a connector, and reference numeral 89 denotes a spring for elastically pressing the connector 88 against the power generation mechanism 8 to prevent it from coming off. The spring 89 is locked to the two convex pieces of the reinforcing member 54. Has been. The connector 88 is connected to a sensor (not shown), and ignites the gas generation mechanism 84 in the power generation mechanism 8 when the sensor detects the possibility of a vehicle collision or the collision of the vehicle. Reference numeral 78 denotes a resin stopper, which is press-fitted into a hole 58 formed in the lid portion 50 through a hole 68 formed in the plate portion 61 of the arm 6. The stopper 78 prevents the arm 6 from rotating (particularly upward) due to vibration or the like, and is sheared when the occupant restraint device is operated.
[0028]
B. Operation of the embodiment Next, the operation of the vehicle seat device having the above configuration will be described. When there is a possibility of collision with a vehicle such as an automobile, or when the vehicle collides, the sensor detects this and ignites the gas generation mechanism 84 of the power generation mechanism 8. The ignited gas generating mechanism 84 releases the gas, thereby pushing the piston 83 forward. As a result, the arm 6 rotates in the clockwise direction in the drawing, and the pipe 60 rises to partially push up the cushion member 11. Thereby, a passenger | crew's buttocks and waist | hip | lumbar part are restrained and it suppresses that a passenger | crew moves ahead. At this time, the one-way clutch 9 is operated so that the piston 83 does not return to the rear end side. Further, the pipe 60 is deformed by an impact on the occupant and relaxes the impact force. Note that the possibility of a vehicle collision may be detected based on the deceleration of the vehicle, the distance to surrounding vehicles or objects, and the like.
[0029]
In the vehicle seat device having the above-described configuration, the convex portion 45 formed on the main body portion 30 and the lid portion 50 of the casing 3 elastically contacts the plate portion 61 of the arm 6. The clearance provided between the two is absorbed. Moreover, since only the convex part 45 is in contact with the arm 6 and a gap is provided in the other part, the frictional resistance is small. Therefore, the arm 6 rotates smoothly and functions as an occupant restraint device reliably. can do.
[0030]
Thus, in the above vehicle seat device, the occurrence of rattling and abnormal noise is suppressed even when various loads and vibrations are applied, and the performance as an occupant restraint device can be reliably exhibited when necessary. . Moreover, such a performance can be obtained simply by providing the projection 45 on the casing 3 and is very inexpensive.
[0031]
In particular, in the above embodiment, since the step portion 40 is formed at the opening edge of the main body portion 30 of the casing 3 and the gap 41 is provided between the lid portion 50, the convex portion 45 is the plate portion 61 of the arm 6. The lid 50 is easily elastically deformed by being pressed by. Thereby, the elastic contact of the convex part 45 and the arm 6 is reliably maintained, and generation | occurrence | production of a rattle or unusual noise can be suppressed more effectively.
[0032]
C. Modification Example ( 1) The force for pressing the convex portion 45 can be adjusted by the position of the step portion 40. In the above embodiment, the stepped portion 40 is disposed at the position indicated by the alternate long and short dash line in FIG. 4A. However, the stepped portion 40 is moved closer to the convex portion 45 as shown in FIG. As a result, even if the deformation resistance of the lid 50 is increased and a considerably intense vibration occurs, it is possible to suppress the occurrence of looseness and abnormal noise. In this case, in order to make the elastic deformation of the lid part 50 uniform, it is desirable to arrange the stepped part 40 so as to form a substantially isosceles triangle having the convex part 45 as a vertex.
{Circle around (2)} Instead of providing the stepped portion 40, the inner surface of the front end portion of the lid portion 50 can be cut and thinned to thereby provide a gap between the opening edge portion of the main body portion 30.
(3) The convex portion 45 can be provided on the inner surface of the plate portion 61 of the arm 6.
(4) Instead of providing the gap 41 in the casing 3, the rear end portion of the plate portion 61 of the arm 6 can be thinned to facilitate elastic deformation.
(5) The above embodiment is configured such that the plate portion of the arm sandwiches the casing, but conversely, the casing can sandwich the arm. In this case, the convex portion can be provided on either or both of the casing and the arm.
(6) The present invention can also be applied to a seat reclining device.
[0033]
【The invention's effect】
As described above, according to the present invention, at least one of the plate portion and the fixing member is provided with a convex portion that elastically contacts the mating member, so that the mating part and other parts can be separated from the mating portion. Since there is a gap between them, the occurrence of rattling and abnormal noise is suppressed even when various loads and vibrations are applied, and the operating performance can be reliably demonstrated when necessary. Performance can be achieved with an inexpensive configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a seat to which an occupant restraint device according to an embodiment of the present invention is applied.
FIG. 2 is a side view of the seat shown in FIG.
FIG. 3 is an exploded perspective view of the passenger restraint apparatus according to the embodiment.
4A is a perspective view showing an arm and a casing in the embodiment, FIG. 4B is a cross-sectional view taken along the line BB in FIG. 4A, and FIG. 4C is a cross-sectional view showing a modified example of FIG. D) is a side view showing a modified example of (A).
FIG. 5 is a side view showing the occupant restraint device of the embodiment.
6 is a cross-sectional view taken along line VI-VI in FIG.
FIG. 7 is a longitudinal sectional view showing a power generation mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sheet | seat, 3 ... Casing (fixed member), 6 ... Arm (movable member),
12 ... seat frame, 30 ... main body (first member), 40 ... step,
41 ... gap, 45 ... convex part, 50 ... lid part (second member).

Claims (4)

A fixed member fixed to the seat; and a movable member rotatably provided on the fixed member. The fixed member is sandwiched between the fixed member and the fixed member when the movable member rotates. A plate portion that is slidably in contact with the other member, and at least one of the plate portion and the fixing member is provided with a convex portion that elastically contacts the counterpart member, so that the counterpart member a gap between,
At least one of the fixed member and the movable member is provided with a first member provided with a step portion protruding in a direction in which the plate portion is sandwiched, and the first member is in contact with the first member on one end side of the step portion. In addition, the second member that forms another gap with the first member on the other end side of the step portion is formed separately from each other, and the step portion is separated from the convex portion. Placed in
The other end portion of the second member is elastically deformed toward the first member within the range of the other gap with the stepped portion as a fulcrum when the convex portion is pressed against the mating member. A vehicle seat device. A fixed member fixed to the seat; and a movable member rotatably provided on the fixed member. The movable member is sandwiched between the movable member and the movable member when the movable member rotates. A plate portion that is in sliding contact with the other member, and at least one of the plate portion and the movable member is provided with a convex portion that is elastically in contact with the counterpart member . a gap between,
At least one of the fixed member and the movable member is provided with a first member provided with a step portion protruding in a direction in which the plate portion is sandwiched, and the first member is in contact with the first member on one end side of the step portion. In addition, the second member that forms another gap with the first member on the other end side of the step portion is formed separately from each other, and the step portion is separated from the convex portion. Placed in
The other end portion of the second member is elastically deformed toward the first member within the range of the other gap with the stepped portion as a fulcrum when the convex portion is pressed against the mating member. A vehicle seat device. Claim 1, wherein the respectively provided with stepped portions on both sides of the first member, and the convex portion and the pair of step portions, is arranged a convex portion so as to form an isosceles triangle having vertices Or the vehicle seat apparatus of 2. The fixed member is fixed to a seat cushion, and the movable member protrudes above the seat cushion by being rotated by a driving mechanism that is driven when a possibility of a vehicle collision or a vehicle collision is detected, The vehicle seat device according to any one of claims 1 to 3 , wherein this suppresses the forward movement of the occupant's buttocks.

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