JP3946948B2 - Reclining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reclining device used in a vehicle or the like, and more particularly to a reclining device that adjusts the inclination angle of a seat back steplessly.
[0002]
[Prior art]
In this type of conventional reclining device, an external gear is provided on the lower arm fixed to the seat cushion, an internal gear having more teeth than the external teeth is provided on the upper arm fixed to the seat back, and the rotary shaft The concentric part is rotatably fitted to the lower arm, and the eccentric part of the rotating shaft is rotatably fitted to the upper arm. In this apparatus, the upper arm can be tilted by rotating the rotating shaft .
[0003]
[Problems to be solved by the invention]
A part that regulates the adjustment range of the inclination angle of the seat back is mounted on the outside of the apparatus, which may be touched by an operator's hand or the like .
[0004]
The present invention has been made to solve the above-mentioned problems, and its object is to provide a reclining device in which an operator's hand does not touch parts that regulate the adjustment range of the inclination angle of the seat back. It is in.
[0005]
[Means for Solving the Problems]
Of the present invention to solve the above problems, a first aspect of the present invention, the seat cushion or a first arm that will be fixed to either the seat back, the seat cushion or the seat back of the second and the other to the Ru is fixed An arm, an external gear provided on the outer peripheral surface with external teeth formed thereon , and an internal tooth having a larger number of teeth than the external teeth meshing with the external teeth of the external gear The internal gear provided on the second arm side and the external gear are coaxially and rotatably fitted, and one of the external gear and the internal gear is connected to the other gear. A reclining device having a rotating shaft that revolves around an axis, and changing an opening angle between the first arm and the second arm by rotating the rotating shaft and adjusting an inclination angle of a seat back And the internal teeth And a concave portion is formed so that a substantially arc-shaped space is formed on one of the opposing surfaces of the external gear, and a convex portion protruding into the concave portion is formed on the other of the opposing surfaces, and the side wall of the concave portion and the The adjustment range of the inclination angle of the seat back is regulated by bringing the convex part into contact with each other and regulating the relative rotation between the convex part and the concave part within a certain range. .
[0009]
According to the present invention, the parts that regulate the adjustment range of the inclination angle of the seat back are accommodated in the space between the internal gear and the external gear, and these parts are not touched by the operator's hand, etc. In addition, the reclining device can be downsized as compared with the case where these components are mounted outside.
[0010]
According to a second aspect of the invention, provided at least two protrusions in claim 1, depending on whether to place the sidewalls of the recess between any of the projections, without changing the respective shapes of the internal gear and the external gear, The adjustment range of the inclination angle of the seat back can be set to different values.
The invention according to claim 3 is the invention according to claim 2, wherein when the concave portion provided on one of the opposing surfaces of the internal gear and the external gear is observed in a state where the side wall of the concave portion is located on the left and right, When the opposing surface provided with the convex portion is observed in a state where the convex portion provided on the other of the opposing surfaces of the internal gear and the external gear is positioned on the left and right, the opposing surface is formed. The surface has a symmetrical shape.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 5, a lower arm 10 as a first arm is fixed to a frame (not shown) of a seat cushion with a bolt or the like. In particular, as shown in FIG. 5, a plurality (six) of fitting holes 11 are provided on the lower arm 10 around the center position of the seat back (portion intersecting the tilt center axis of the seat back). It is drilled to be located on the top.
[0012]
The upper arm 20 as the second arm is fixed to a seat back frame (not shown) by bolts or the like. In particular, as shown in FIG. 5, in the upper arm 20, a plurality (six) of fitting holes 21 are provided on the same circumference around the tilt center position of the seat back (a portion intersecting the tilt center axis of the seat back). It is drilled so as to be located above.
[0013]
As shown in FIG. 1 in particular, the gear mechanism 30 is mounted between the lower arm 10 and the upper arm 20 and adjusts the inclination angle of the upper arm 20. The external gear 31 and the internal gear in the gear mechanism 30. A plurality of columnar protrusions 31 a and 32 a that are fitted into the fitting hole 11 of the lower arm 10 and the fitting hole 21 of the upper arm 20 are provided in the lower arm 32.
[0014]
As shown in FIG. 6, the external gear 31 has a substantially disk shape, an external tooth 31 b is formed on the outer peripheral surface, and a cylindrical portion 31 f is formed in the center. The external gear 31 is positioned by inserting a plurality (six) of protrusions 31 a formed on the side surface into the fitting hole 11 of the lower arm 10, and is welded to the lower arm 10 after this positioning.
[0015]
The internal gear 32 is also substantially disk-shaped as shown in FIG. The internal gear 32 is engraved with internal teeth 32b that are inscribed with the external teeth 31b and that have at least one more tooth than the external teeth 31b of the external gear 31. A circular through hole 32 f is formed in the center of the internal gear 32. The internal gear 32 is positioned by fitting a plurality (six) of cylindrical protrusions 32a on the side surface into the fitting hole 21 of the upper arm 20, and is welded to the upper arm 20 after this positioning.
[0016]
Of the opposing surfaces of the external gear 31 and the internal gear 32, a concave portion 31c is formed on the opposing surface of the external gear 31 so that a substantially arc-shaped space is formed, and on the opposing surface of the internal gear 32, A protruding portion 32c protruding into the recessed portion 31c is formed. Since the internal gear 32 in the gear mechanism 30 adjusts the inclination angle of the seat back, the internal gear 32 naturally rotates with respect to the external gear 31, but it is necessary to limit the rotation range within a certain range. There is also. The concave portion 31c and the convex portion 32c function as the rotation restricting stopper, and the convex portion 32c is brought into contact with the side wall 31d of the concave portion 31c so that the rotation of the internal gear 32 is within a certain range. It is regulated.
[0017]
In the present embodiment, the two convex portions 32c are provided at asymmetric positions with respect to the center of the internal teeth 32b (center of the tip circle). Therefore, as shown in FIG. 7B, the angle between the upper side walls of the two convex portions 32c is θ2, and the angle between the lower side walls of the two convex portions 32c is θ3 (θ2 <θ3). ing. Here, as shown in FIG. 6A, if the angle between the side walls 31d of the external gear 31 is θ1, the rotation range of the internal gear 32 is as follows.
[0018]
First, when the internal gear 32 is assembled to the external gear 31 so that the side wall 31d of the recess 31c exists between the upper side walls of the two convex portions 32c, the rotation range of the internal gear 32 is about “Θ2−θ1”. Conversely, when the internal gear 32 is assembled to the external gear 31 so that the side wall 31d of the concave portion 31c exists between the lower side walls of the two convex portions 32c, the rotation range of the internal gear 32 is determined. Becomes approximately “θ3-θ1” (> θ2-θ1). Therefore, the adjustment range of the inclination angle of the seat back can be set to different values without changing the shapes of the internal gear 32 and the external gear 31.
[0019]
A cylindrical portion 33 a of a cylindrical rotary shaft 33 with a flange as shown in FIG. 8 is rotatably fitted in the cylindrical portion 31 f of the external gear 31. An arcuate notch 33c is formed in the flange 33b of the rotating shaft 33. The rotary shaft 33 is rotationally driven when adjusting the inclination angle of the seat back, and in order to receive this rotational force, a connecting serration is cut on the inner cylindrical surface of the cylindrical portion 33a.
[0020]
A cylindrical bush 34 having excellent wear resistance is fitted and fixed in the through hole 32 f of the internal gear 32. Further, a pair of wedge-shaped members 35 and 36 are inserted between the inner cylindrical surface of the bush 34 and the outer cylindrical surface of the cylindrical portion 31 f of the external gear 31 so as to be in contact with both.
[0021]
The wedge-shaped members 35 and 36 have a plane-symmetric shape, and the shape of the wedge-shaped member 35 is shown in FIG. The inner cylindrical surface 35 a of the wedge-shaped member 35 has an inner diameter that is substantially the same as the outer diameter of the cylindrical portion 31 f of the external gear 31, and the outer cylindrical surface 35 b of the wedge-shaped member 35 is an outer diameter that is substantially the same as the inner diameter of the bush 34. have. The inner cylindrical surface 35a and the outer cylindrical surface 35b of the wedge-shaped member 35 are changed in a wedge shape because the center axes thereof do not coincide with each other.
[0022]
A stepped recess 35c is formed on the end surface of the thin-walled area of the wedge-shaped member 35, and the flange portion 33b of the rotary shaft 33 projects into this space. Therefore, when the rotating shaft 33 rotates counterclockwise in FIG. 2, the side wall 33g of the notch 33c of the rotating shaft 33 contacts the side wall 35g of the recess 35c of the wedge-shaped member 35, and conversely, the rotating shaft 33 is When rotating clockwise in FIG. 2, the side wall 33h of the notch 33c of the rotary shaft 33 comes into contact with the side wall 36g of the wedge-shaped member 36 on the opposite side.
[0023]
The wedge-shaped members 35, 36 are arranged between the inner cylindrical surface of the bush 34 and the outer cylindrical surface of the cylindrical portion 31 f of the external gear 31 so that the thick side faces each other. The gear 32 is eccentric, and the outer teeth 31b are engaged with the inner teeth 32b. As will be described later, the rotating shaft 33 meshes the internal teeth 32b and the external teeth 31b by the wedge-shaped members 35 and 36, and either the external gear 31 or the internal gear 32 is centered on the other gear shaft. It can be revolved. The wedge-shaped members 35 and 36 receive a biasing force in a direction away from a spring 37 as an elastic member as shown in FIG.
[0024]
The spring 37 includes a one-turn annular portion 37a and end portions 37b and 37c rising from the annular portion 37a. The annular portion 37a is an annular space continuously provided inside the recess 31c of the external gear 31. It is stored inside. Further, the end portion 37b is engaged with a groove portion 35d formed on the side wall on the thick side of the wedge-shaped member 35, and the end portion 37c is formed on a groove portion 36d formed on the side end surface on the thick side of the wedge-shaped member 36. It is locked.
[0025]
The cylindrical pressing member 38 is fitted to the outer peripheral surface of the internal gear 32, and both end portions thereof protrude toward the central axis, and sandwich the external gear 31 and the internal gear 32. Thereby, it can control that the external gear 31 and the internal gear 32 leave | separate in an axial direction. An annular groove 33d is cut at the tip of the rotary shaft 33, and a retaining ring 39 is locked there.
[0026]
Next, the operation of the above embodiment will be described. In a state where no rotational operation force is applied to the rotary shaft 33 from the outside, the spring 37 biases the wedge-shaped members 35 and 36 away from each other, and applies a force in the direction of driving the wedges to the wedge-shaped members 35 and 36. . Therefore, relative movement between the internal gear 32 and the rotary shaft 33 is prohibited, the gear mechanism 30 is in a locked state, and the seat back is locked at that position.
[0027]
In this locked state, for example, when the rotating shaft 33 is rotated counterclockwise in FIG. 2, a force in the direction of pulling out the wedge-shaped member 35 from the gap from the side wall 33g of the rotating shaft 33 to the side wall 35g of the wedge-shaped member 35 acts. The wedge-shaped member 35 rotates counterclockwise with respect to the internal gear 32. As a result, a gap is generated between the wedge-shaped member 35 and the peripheral member, and the internal gear 32 can be moved. Then, the wedge-shaped member 36 receiving the urging force of the spring 37 rotates counterclockwise so as to fill this gap.
[0028]
By this interlocking operation, the wedge-shaped members 35 and 36 rotate counterclockwise together with the rotating shaft 33. The same applies to the clockwise rotation. Therefore, the internal gear 32 is supported by the rotary shaft 33 at an eccentric position where the internal teeth 32b mesh with the external teeth 31b, and the external gear 31, the internal gear 32, and the rotary shaft 33 constitute a gear mechanism. Will be doing.
[0029]
Thus, by rotating the rotary shaft 33, the upper arm 20 can be tilted with respect to the lower arm 10, and the tilt angle of the seat back can be adjusted.
[0030]
In the present embodiment, the lower arm 10 and the upper arm 20, the external gear 31 and the internal gear 32 are separate members, and the external gear 31b is formed on the external gear 31 without using half blow molding. For this reason, the external gear 31 is particularly easy to mold, and the external gear 31 can be manufactured at low cost even with high accuracy. Further, the lower arm 10 and the upper arm 20 and the external gear 31 and the internal gear 32 are connected to the plurality of fitting holes 11 and 21 of the lower arm 10 and the upper arm 20, and the protrusions 31 a and 32 a of the external gear 31 and the internal gear 32. Is positioned by fitting. For this reason, the positioning accuracy and the bonding strength can be ensured, and the assembly is facilitated. As a result, the manufacturing cost can be reduced.
[0031]
Further, since the external gear 31 and the internal gear 32 are supported by the pressing member 38 along the entire circumference, the axial connection strength between the external gear 31 and the internal gear 32 is increased. Furthermore, parts (rotation restriction stoppers) for regulating the adjustment range of the inclination angle of the seat back are accommodated in the space between the internal gear 32 and the external gear 31, and the operator's hand touches these parts. The reclining device can be downsized as compared with the case where these components are mounted outside.
[0032]
Further, since the two convex portions 32c are provided, the seat back of the seat back can be changed without changing the shapes of the internal gear 32 and the external gear 31 depending on which of the convex portions 32c the side wall 31d of the concave portion 31c is disposed. The adjustment range of the tilt angle can be set to different values.
[0033]
The present invention is not limited to the above embodiment. For example, in the above embodiment, the external gear 31 is attached to the lower arm 10 and the internal gear 32 is attached to the upper arm 20, but the reverse may be possible. Moreover, the number of the convex parts 32c may be one, or three or more. The number and arrangement of the protrusions 31a and 32a and the fitting holes 11 and 21 are not limited to the above embodiment.
[0037]
【The invention's effect】
As described above , according to the first aspect of the present invention, the parts that regulate the adjustment range of the inclination angle of the seat back are accommodated in the space between the internal gear and the external gear, and these parts are stored in the operator. The reclining device can be reduced in size as compared with the case where these parts are attached to the outside.
[0038]
According to the second aspect of the present invention, the adjustment range of the inclination angle of the seat back can be set to different values without changing the shapes of the internal gear and the external gear.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a left side view (the upper arm and the lower arm are deleted) in the embodiment of FIG.
FIG. 3 is a right side view of the embodiment of FIG. 1 (upper arm and lower arm are deleted);
4 is an exploded perspective view of a main part in the embodiment of FIG. 1. FIG.
FIG. 5 is a view for explaining the coupling between the gear mechanism and the upper arm and the lower arm.
FIG. 6 is a view showing an external gear, and FIG. 6B is a cross-sectional view taken along line AA of FIG.
FIG. 7 is a view showing an internal gear, in which (a) is a cross-sectional view taken along line BB of (b).
8A and 8B are views showing a rotating shaft, and FIG. 8B is a cross-sectional view taken along the line CC of FIG.
9A and 9B are enlarged views showing a wedge-shaped member, where FIG. 9A is a plan view and FIG. 9B is a front view.
10A and 10B are views showing a spring, where FIG. 10A is a plan view and FIG. 10B is a front view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Lower arm 11 Fitting hole 20 Upper arm 21 Fitting hole 30 Gear mechanism 31 External gear 31a Protrusion 31b External tooth 31c Recess 32 Internal gear 32a Protrusion 32b Internal tooth 32c Protrusion 33 Rotating shaft 34 Bush 35, 36 Wedge-shaped member 37 Spring 38 Holding member

Claims (3)

A first arm that will be fixed to either the seat cushion or the seat back, and a second arm that will be fixed to the other of the seat cushion or the seat back, provided on the first arm, on the outer circumferential surface of the external teeth an external gear formed are internal teeth engraved a larger number of teeth than the external teeth meshed with external teeth of the external gear, and an internal gear provided on the second arm side, the outer teeth A rotating shaft that is coaxially and rotatably fitted to a gear and revolves one of the external gear and the internal gear about the other gear shaft, and rotates the rotating shaft. A reclining device that adjusts an inclination angle of a seat back by changing an opening angle between the first arm and the second arm , wherein one of the opposing surfaces of the internal gear and the external gear A substantially arc-shaped space is formed in And forming a convex portion projecting into the concave portion on the other of the opposing surfaces, contacting a side wall of the concave portion with the convex portion, and relative to the convex portion and the concave portion. A reclining device that regulates an adjustment range of an inclination angle of a seat back by restricting rotation within a certain range . The adjustment range of the inclination angle of the seat back without changing each shape of the internal gear and the external gear by providing at least two convex portions and arranging the side wall of the concave portion between which convex portions. The reclining device according to claim 1 , wherein a different value can be set . The concave portion provided in one of the opposing surfaces of the internal gear and the external gear has a symmetrical shape when observed in a state where the side walls of the concave portion are positioned on the left and right, and the internal gear When the opposing surface on which the convex portion is provided is observed in a state where the convex portion provided on the other of the opposing surfaces of the external gear and the external gear is positioned on the left and right, the opposing surface has a symmetrical shape. The reclining device according to claim 2 .

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