JPH0229209A - Reclining adjuster - Google Patents

Abstract

PURPOSE:To enable execution of excellent reclining operation and to reduce the cost of a product having excellent durability by a method wherein a seat back bracket is guided by a seat cushion bracket by means of a relation between the protrusion of a slide part and the groove of a guide part and rotated around one point of the upper part of the seat cushion. CONSTITUTION:When a seat back 14 is forced to rise frontwardly, with a control knob 15 rotated in the direction of a clockwise rotation arrow mark A, a press contact state between a tension spring 27 of a spring coupler and the inner peripheral surface of a case 23 is rendered ineffective, a rotation force from the control knob 15 is transmitted through an adjuster shaft 21 and a hold ring 24 to rotate a rotary body 25. Rotation of the rotary body 25 causes guidance of a line part 13a of protrusion of a seat bracket 13, a tooth part 13d of which is engaged with a pinion hear 25a, along a groove part 12a of a seat cushion bracket 12, and the seat back bracket is rotated upward around a center 0. The rotation center 0 of the seat back brackets 13 and 13' is set so as to coincide with the hip point of the hip joint of a user when the user sits down a reclining seat.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a reclining adjuster that is attached between a seat cushion bracket and a seat pack bracket and can freely adjust the inclination angle of the seat back. .

(Prior Art) A conventional reclining adjuster is the Xi! shown in FIG. JI! There was a type that was continuously adjustable using gears.

This conventional reclining adjuster has a sprocket 3 rotatably attached to the rear end of a seat cushion bracket 1 via a shaft 2.

The seat back bracket 5 has a gear 4 fixed to the seat cushion bracket 1 and having a sprocket 3 and a coaxial external gear 4A formed on the side surface.

Its lower end is rotatably penetrated by the eccentric part 2A of the shaft 2,
The eccentric part 2 of the shaft 2 is attached to the side of this seat back bracket 5.
The internal gear 5A formed coaxially with a is the external gear 4A of gear 4.
It is installed in a state where it is engaged with the

And I of the internal gear 5A of this seat back bracket 5
The fI number is greater than the number of teeth of the external gear 4A of the gear 4, and the internal gear 5A rotates eccentrically by the eccentric portion 2A of the shaft 2 that rotates integrally with the sprocket 3, and rotates around the external gear 4A of the gear 4 in a so-called manner. Due to the planetary motion, the inclination of the seat back bracket 5 gradually changes.

In the reclining adjuster shown in FIG. 1, the sprocket 3 is rotated by the rotation of the reclining operation knob 6 being transmitted via the sprocket 7 and the chain 8.

(Problem to be Solved by the Invention) However, in the conventional reclining adjuster as described above, when the reclining adjustment is performed using the operation knob 6, the internal gear 5A makes a planetary movement around the external gear 4A of the gear 4, and the seat Since the back bracket 5 performs a so-called cyclonic movement, the movement of the seat back supported by the seat back bracket 5 periodically increases or decreases and is not constant, resulting in a good reclining operation feeling. I couldn't get it.

In addition, in the conventional reclining adjuster, the moment load from the seatback is received by the shaft 2 and the meshing portion between the internal gear 5A of the seatback bracket 5 and the external gear 4A of the gear 4. Since the gear 4A normally meshes with two to three teeth, a high load is applied to the meshing tooth portion, resulting in a problem in single-strength durability. In addition, in order to give gears high durability, each gear needs processing such as heat treatment.

Another problem was that it caused high costs.

Furthermore, in the conventional reclining adjuster,
Since precision is required for each gear, special processing methods such as fine blanking must be used to form the teeth on the gear 4 and seat back bracket 5, which contributes to high costs such as mold costs. was.

This invention has the following features: 1. This was done in order to eliminate the drawbacks of the conventional reclining adjuster as described above. That is, the object is to provide a reclining adjuster that allows a smooth reclining operation, is excellent in durability, and can be manufactured at a low cost.

(Means for Achieving the Object) In order to achieve the above object, the present invention provides a pair of seat cushion brackets each having an arcuate guide portion disposed on both sides of the seat cushion and each having an arcuate guide portion centered at a point above the seat cushion. and a sliding part formed to have the same curvature as the guide part of this seat cushion bracket, and a tooth part extending along an arc having the same curvature as the guide part, and the unevenness between the sliding part and the guide part. a pair of seat back brackets, each of which is rotatably attached to the seat cushion bracket around the one point; and a binion gear that is rotatably attached to the seat cushion bracket and meshes with the arc-shaped teeth of the seat back bracket. The reclining operation section has a reclining operation section.

In addition, in order to achieve the problem, in the above configuration, one of the guide part and the sliding part is an arcuate groove part, and the other part is an arcuate protrusion part, and this protrusion part is inserted into the groove part of the sliding part (+E). It is preferable that the seat back bracket be attached to the seat cushion so as to be rotatable about one point on the seat cushion, and that a lubricating member such as a resin member be provided between the groove and the protrusion. It is preferable to intervene.

Further, in the above configuration, it is preferable that one point above the seat cushion is set to coincide with the hip joint of the person sitting on the seat.

Furthermore, in the above configuration, the reclining operation section includes a spring coupler and an operation knob provided on a side part of the seat cushion, and rotation of the operation knob in both directions is transmitted to the pinion gear via the spring coupler. It is preferable to do so.

(Function) The reclining adjuster according to the present invention is a seat back bracket in which, when adjusting the reclining position, a rotational force is input from the reclining operation part to rotate the pinion gear, so that the two circular arc teeth engage with the pinion gear. However, the sliding portion is guided by the guide portion of the seat cushion bracket in accordance with the direction of rotation of the pinion gear, thereby rotating upward or downward around a point above the seat cushion.

Therefore, when the seat back bracket is rotated upward, the seat back fixed between the pair of seat back brackets is raised forward.

Conversely, when the seat back bracket is rotated downward, the seat back is tilted rearward and the reclining adjustment is performed.

If one of the guide portion of the seat cushion bracket and the sliding portion of the seat back bracket is an arc-shaped groove and the other is an arc-shaped protrusion, the seat If the back bracket is guided to rotate around a point above the seat cushion, and a lubricating part such as a resin member is interposed between the groove and the protrusion, this groove and Smooth sliding between the protrusions is achieved.

Also, if one point on one side of the seat cushion is set to match the hip joint of the person sitting on the seat,
The center of rotation of the seat back coincides with the center of flexion of the upper body of the person sitting on the reclining seat relative to the lower body.

In addition, if the reclining operation unit includes a spring coupler and an operation knob provided on the side of the seat cushion, and the rotation of this operation knob in both directions is transmitted to the pinion gear via the spring coupler, the operation knob side Rotation of the pinion gear is allowed only when there is a rotational input from.

(Example) This invention will be described in more detail below based on an example shown in two drawings.

FIG. 1 shows a reclining adjuster lO according to the present invention.
This figure shows a reclining seat for a vehicle equipped with a seat back bracket 13 that is slidably attached to seat cushion brackets 12 fixed to a base on both sides of a seat cushion 11. Seat back! 4 is fixed. 15 is an operation knob for adjusting reclining. Also, the center 0 shown in the diagram is the seat back bracket! It is the center of rotation of 3.

FIG. 2 is a diagram showing how the seat cushion bracket 12 and seat back bracket 13 are assembled.
The figure is an exploded view of FIG. 2, and the seat cushion brackets 12 and 12' on both sides of the seat cushion have arcuate grooves 12a and 12'a that open inward and are centered at the center 0 in FIG. (guide portions) are formed, and resin guides 12b, 12'b are fitted into these groove portions 12a, 12'a.
, 12'b and a hole 12d formed in the groove 12a.

That is, the entire inner wall surface of the groove portion 12a is covered with a synthetic resin having a small coefficient of friction. In addition, the seat cushion bracket 12.12' has grooves 12a, +2 whose 1-edges are folded back inward and centered at the center 0.
' The arc-shaped guide part 12e has the same curvature as a.
, 12'e are formed.

This seat cushion bracket 12. At 12',
The seat back bracket 1 is attached to the resin guides 12b and 12'b fitted in the grooves +2a and 12'a.
3. An arcuate protrusion 13a protruding from the side surface of 13'
(sliding part) is fitted to the seat back bracket 13.13' so as to be movable, and the upper edge of the seat back bracket 13.13' is connected to the guide part 12.12.
'It is installed in a mated state.

This seat back bracket 13.13' has an upper edge 13b, a lower edge 13c and a protrusion 13a as a guide part 12c of the seat cushion bracket 12.12'.
It has an arcuate shape formed to have the same curvature as the groove 12a, and the protrusion 13a is the groove 12a of the seat cushion bracket 12.12'.

Along 12'a, the L edge tab is also connected to the guide part 12e.
By moving inwardly along the respective lines, it is rotatable in a vertical plane, and a tooth portion 13d is formed in the shape of a circular arc at the lower edge portion 13c. With the protrusion 13a of the seat back bracket 13.13' fitted into the grooves 12a, 12'a of the seat cushion bracket 12.12', the seat back brackets 13, 1
3' lower edge at (13c is a pair of brackets 12' fixed to the seat cushion bracket 12, 12',
12' carried by 1' and its upper edge 13b
In the guide portions 12c and 12'o of the seat cushion bracket 12.12', the guide portions 12c
, 12' Resin shoe 1 fitted into the bent part of c.
2g and 12'g, the resin guide part 12b
.

12' b is slidably held at j■1 (see Fig. 4).

The following two structures are the same on both sides of the seat cushion 11, and are symmetrically constructed.

One bracket 1 of the seat cushion brackets 12 and 12' fixed to both sides of the seat cushion 11
As particularly shown in FIG. 4, the adjuster shaft 21 is inserted into the holes 12h and 12'h drilled in the lower part of the groove 12a of the reclining seat for a passenger car. is inserted, and the large diameter portion 21a of the adjuster shaft 21 is rotatably supported while passing through a case 23 fixed to the outer wall surface of the seat cushion bracket 12' with a pin 22 on the outside of the hole 12'h. There is. Furthermore, Fig. 3 and Fig. 4 are as follows.
The case where the entrance/exit door is opposite to the seat is shown.

The inside of the large diameter portion 21a of the adjuster shaft 21 passes through the center of the tension spring retaining ring 24 housed in the case 23, and the spline portion 21b formed on the shaft 21 extends around the inner circumference of the retaining ring 24. By meshing with the parts, the shaft 21 rotates integrally with the shaft 21. Adjuster shaft 2 again! A rotating part 25 having a pinion gear 25a formed on the outer circumferential part is fitted into the distal end of the rotating part 25, and a protruding part 25b formed on the outer outer circumferential part of this rotating part 25 so as to protrude axially outward is attached to the retaining ring. The one-rotation part 25 rotates integrally with the adjuster shaft 21 by being inserted into a notch 24a formed on the outer periphery of the adjuster shaft 24 and engaging with the notch 24a. The distal end of the rotary part 25 passes through the support bracket 2B fixed to the inner wall of the seat cushion bracket 12' by a pin 22 inside the hole 12'h, and is rotatably supported by the support bracket 2B. Also, the pinion gear 25a meshes with the teeth 13'd of the seat back bracket 13'.

As shown in FIG. 5, the protrusion 25b of the rotating part 5 is loosely fitted into the notch 24a of the retaining ring 24 with a predetermined gap on both sides in the circumferential direction, and is held within the gap. The ring 24 and the rotating part 25 can rotate relative to each other. The outer circumferential surface of the retaining ring 24 and the outer circumferential surface of the protruding portion 25b form one cylindrical surface.

A tension spring 27 is interposed between this cylindrical surface and the inner peripheral surface of the case 23 with its outer diameter reduced, and both ends 27a of this tension spring 27 are connected to the protrusion 25.
They are fitted into the gaps on both sides of b to form a spring coupler.

That is, the outer peripheral portion of the tension spring 27 is pressed against the inner peripheral surface of the case 23 in a standby state.

When there is a rotational input from the adjuster shaft 21 side, one end 27a of the tension spring 27 engages with one of the circumferential side edges of the notch 24a, and the outer diameter of the tension spring 27 is contracted. By releasing the pressure contact state with the case 23, the adjuster shaft 21
rotation is allowed, but when there is a rotational input from the 1-rotation part 25 side, one end of the tension spring 27 engages with the circumferential side of the protrusion 25b, and the spring 27
The rotation of the nine rotating portion 25 is prevented by being biased in a direction in which the outer diameter of the rotating portion 25 is further expanded.

Further, a reclining adjuster operation knob 15 is attached to the outer end of the adjuster shaft 21 so as to rotate therewith.

The seat cushion bracket 12 on the opposite side to the seat cushion bracket +2' to which this operation knob 15' is attached has an adjuster shaft 21 on the inside thereof.
Binion 28 is coaxial with .

The outer end 28a of the shaft portion is connected to the seat cushion bracket 12.
In addition, the inner end 28b of the shaft portion is connected to the seat cushion bracket 1.
Each support bracket 30 is rotatably supported by a support bracket 30 fixed to the inner wall of 2 by a pin 29. The tooth portion 13d of the seat back bracket 13 is connected to the inner wall of the seat cushion bracket 12 and the support bracket 30.
It meshes with the pinion 28 between the two.

This binion 28 and the rotating portion 25 of the opposite seat cushion bracket are connected by a connecting rod 31.
The rotating part 25 and the binion 28 are configured to rotate integrally.

Note that in this embodiment, the seat back bracket 13.
The center of rotation O of 13' is set to coincide with the hip point of a person when he or she sits on this reclining seat.

Next: Adjustment of the reclining seat using the -1-λ reclining adjuster will be explained.

When trying to raise the seat back forward.

When the operating knob 15 is rotated in the clockwise direction (arrow A) in FIG. The rotational force from is transmitted via the adjuster shaft 21 and the retaining ring 24 to rotate the rotating body 25.

By the rotation of this rotating body 25, the pinion gear 2
The seatback bracket 13, in which the toothed portion 5a and the toothed portion 13d of the seatback bracket 13 engage with each other, is rotated upward about the center 0, with the protruding portion 13a guided along the groove portion 12a of the seat cushion bracket 12.

At the same time, the pinion 28 is also rotated integrally with the rotary body 25 by connection with the connecting rod 31, and the pinion 28 and the toothed portion 13d of the other seat back bracket 13 mesh with each other.
center O in synchronization with one seat back bracket 13.
It rotates in two directions around the center.

By such rotation of the seat back brackets 13 on both sides, the seat back 14 is pulled forward as shown by the chain line α in FIG.

In addition, when attempting to tilt the seat back 14 backwards, the operating knob 15 is rotated in the opposite direction (in the direction of arrow B in FIG. 1), and the spring coupler is released and the rotating body 25 is rotated, and at the same time, the pinion 28 is also rotated in the opposite direction, and the tooth portions 13d of each are rotated to the pinion gear 25a or the pinion 2B.
The seat back brackets 13 on both sides that mesh with the seat cushion bracket 12 are guided by the guide portions 12a of the seat cushion bracket 12 and rotated downward about the center 0. As a result, the seat back 14 is tilted rearward as indicated by the chain line β in FIG.

In the reclining operation as described above, the seat back 14 is pulled up centering on the hip point of the person sitting on the seat because the center O is set to coincide with the hip point of the person sitting on the seat. He will be inclined towards it.

Furthermore, when the weight of the person sitting on the seat is applied to the seat back 14 and a backward moment is applied to the seat back 14, the load is transferred to the seat back bracket 13.
The entire joint surface between the protruding portion 13a and the guide portion 12a of the seat cushion bracket 12 and the bracket! 2" and is supported at these portions, the load on the meshing portion between the tooth portion 13d and the pinion gear 25a or the pinion 28 is significantly reduced.

In addition, in the two-legged embodiment, a case was shown in which the additional knob 15 was attached directly to the adjuster shaft 21, but similarly to the conventional one shown in FIG. 6, the operation knob is attached to the front side of the seat cushion, The rotational force may be transmitted to the adjuster shaft via the adjuster shaft.

In addition, the above reclining adjuster is for 9 passenger cars, electric towels,
It is applicable to various reclining seats for other vehicles, theaters, etc.

(Effects of the Invention) As described above, the present invention allows the seat back bracket to rotate about one point on one side of the seat cushion l while being guided by the uneven relationship between the sliding part and the guide part. By doing so, the seatback moves uniformly and smoothly in response to rotational input from the reclining operation part, making it possible to obtain a good reclining operation feeling, and the moment load applied to the seatback is reduced as compared to conventional methods. The product is supported by the sliding surface of the sliding part and the guide part, rather than by the meshing part of the gear, and has excellent durability.This eliminates the need for special processes to increase the strength of the meshing part, unlike conventional products. It becomes possible to reduce the cost.

In addition, since the seat back bracket rotates around a point above the seat cushion, if the point above the seat cushion is set to coincide with the hip joint of the person sitting on the reclining seat, the Since the center of flexion of the person's upper body coincides with the center of rotation of the seat back, there is no need for the two people to correct their sitting positions during the reclining operation.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a reclining seat equipped with a reclining adjuster according to the present invention, FIG. 2 is a side view showing an embodiment of the reclining adjuster according to the present invention, FIG. 3 is an exploded view of the same embodiment, and FIG. The figure is a sectional view showing the reclining operation part of the same embodiment, FIG. 5 is a view showing the spring coupler of the reclining operation part of FIG. 4,
FIG. 6 is an exploded view showing a conventional reclining adjuster. 10... Reclining adjuster 11... Seat cushion 12, 12'... Seat cushion bracket 12
a, 12'a...Groove portion 12b, 12'b...Resin guide 13, 1
3'... Seat back bracket 13a, 13
' a = Projection portion 13 d, 13' d... Tooth portion 14... Seat back 15... Operation knob 21.
...Adjuster shaft 23...Case 24...Retaining ring 25...
・Rotating part 25a... Binion gear 27...
・Tension spring 28...Pinion applicant: Aisin Seiki Co., Ltd. Agent Patent attorney: Asahi Kato ■ Figure 5 Figure 4

Claims (1)

[Scope of Claims] 1. A pair of seat cushion brackets disposed on both sides of the seat cushion, each having an arcuate guide portion centered at a point above the seat cushion, and a curvature that is the same as the guide portion of the seat cushion bracket. It has a sliding part and a tooth part extending along an arc of the same curvature as the guide part, and the uneven relationship between the sliding part and the guide part allows the seat cushion bracket to be centered on the one point, respectively. The reclining operation part includes a pair of rotatably attached seat back brackets, and a reclining operation section rotatably attached to the seat cushion bracket and having a pinion gear that meshes with the arc-shaped teeth of the seat back bracket. Features a reclining adjuster. 2. One of the guide portion and the sliding portion is an arcuate groove and the other is an arcuate protrusion, and the protrusion is slidably fitted into the groove to form a seat back bracket. 2. The reclining adjuster according to claim 1, wherein the reclining adjuster is rotatably attached to the seat cushion about a point above the seat cushion. 3. The reclining adjuster according to claim 2, wherein a lubricating member is interposed between the groove and the protrusion. 4. The reclining adjuster according to claim 1, wherein one point above the seat cushion is set to coincide with the hip joint of a person sitting on the seat cushion. 5. The recliner according to claim 1, wherein the reclining operation part includes a spring coupler and an operation knob provided on a side part of the seat cushion, and rotation of the operation knob in both directions is transmitted to the pinion gear via the spring coupler. Adjuster.