JPH0433606A - Inclination angle adjusting device of upper back rest part in back rest seat for vehicle - Google Patents

Abstract

PURPOSE:To easily adjust the upper back rest part by a simple constitution by providing a rotation transmission member between the inside peripheral teeth of the lower Taumel mechanism, and the outside peripheral teeth of the upper reverse Taumel mechanism. CONSTITUTION:The lower Taumel mechanism 19 is constituted of a recessed part 20 of the lower moving bracket 16, inside peripheral teeth 21 of its inside peripheral surface, a projecting part 22 of the lower fixed bracket 18, outside peripheral teeth 23 formed in its outside periphery, and the lower rotary shaft 26. The upper reverse Taumel mechanism 40 is constituted of a recessed part 43 of the upper fixed bracket 41, inside peripheral teeth 44 formed in its inside peripheral surface, a projecting part 45 of the upper moving bracket 42, outside peripheral teeth 46 formed in its outside periphery, and the upper rotary shaft 49. To the outer end side of the upper rotary shaft 49, a passive gear 53 is fixed, and between its gear and a driving gear 29 fixed to a valve end side of the lower rotary shaft 26, a rotation transmission member 54 constituted of a timing belt is stretched round, and the upper reverse Taumel mechanism 40 is interlocked with the lower Taumel mechanism 19. When the lower Taumel mechanism 19 lays down backward the lower back rest part, the upper reverse Taumel mechanism 40 lays down forward the upper back rest part.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an inclination angle adjusting device for an upper backrest portion of a vehicle backrest seat.

(Prior art) Japanese Patent Application Laid-Open No. 60-193729 discloses that the back seat is composed of a seat attached to the vehicle body side and a backrest seat attached to the rear of the seat so as to be rotatable back and forth. The canopy seat is divided into a lower backrest portion and an upper backrest portion, the lower backrest portion is pivotally fixed to the seat sheet so as to be rotatable back and forth, and the upper backrest portion is connected to the lower backrest portion. In a vehicle backrest seat, the seat is fixed to a shaft so as to be rotatable back and forth, and the upper backrest portion is configured to rotate back and forth when the lower backrest portion is rotated back and forth. , the bracket a of the seat, and the arm C of the upper backrest frame b.
A device for adjusting the inclination angle of an upper backrest in a vehicle backrest seat is provided with a parallel link mechanism connected by a connecting rod e parallel to the lower backrest frame d (No. 13). (see figure).

(Problems to be Solved by the Invention) The above-mentioned known device for adjusting the inclination angle of the upper backrest has a structure that also serves as a rod between the bracket a of the seat and the arm C of the paired upper backrest frame b. Since the lower backrest frame d and the connecting rod e are connected to the parallel link mechanism, when the lower backrest frame d tilts backward together with the connecting rod e, the arm C rotates to the left in the figure. The upper backrest frame b gradually tilts forward.

However, with the above configuration, there is no concern about the tensile strength of the connecting rod e, but there is a concern about the compressive strength because it is difficult to make the connecting rod thicker, although there is no other way than to make it thicker.

Therefore, we devised other structures.

(Object of the Invention) Therefore, an object of the present invention is to obtain an apparatus for adjusting the inclination angle of an upper backrest that is less likely to malfunction by utilizing the known Taumel mechanism.

(Means for Solving the Problems) Therefore, the present invention comprises a seat 2 attached to the vehicle body side and a back seat 3 attached to the rear of the seat 2 so as to be rotatable back and forth. 3 is divided into a lower backrest part 4 and an upper backrest part 5, the lower backrest part 4 is pivoted to the seat 2 so as to be rotatable back and forth, and the upper backrest part 5 is The lower backrest part 4 is pivotally fixed to the lower backrest part 4 so as to be freely rotatable back and forth, and the upper backrest part 5 moves in conjunction with the lower backrest part 4 when the lower backrest part 4 is rotated back and forth. In the vehicle backrest seat configured to rotate back and forth in the opposite direction, the lower backrest portion 4 side has inner peripheral teeth 21 at the pivot portion between the lower backrest portion 4 and the seat sheet 2. and the lower Taumel mechanism 1 has outer teeth 23 on the seat 2 side.
9, and the shaft stop portions of the upper backrest portion 5 and the lower backrest portion 4 have outer peripheral teeth 46 on the upper backrest portion 5 side and inner peripheral teeth 44 on the lower backrest portion 4 side. An upper reversing Taumel mechanism 40 is provided, and the inner peripheral tooth 21 of the lower Taumel mechanism 19 is provided.
This is an inclination angle adjusting device for an upper backrest portion of a vehicle backrest seat, in which a rotational transmission member 54 is provided between the outer circumferential teeth 46 of the upper reversing Taumel mechanism 40.

Further, the relationship between the inner peripheral teeth and the outer peripheral teeth may be reversed.

(Embodiment) To explain an embodiment of the present invention with the drawings, 1 is a vehicle seat, 2 is a seat for the vehicle, 3 is a backrest attached to the rear of the seat 2 so as to be rotatable back and forth. It is a canopy sheet.

The backrest sheet 3 is formed into two parts: a lower backrest part 4 that supports the lower back and waist, and an upper backrest part 5 that supports the upper back.

In FIG. It is formed into a square frame shape by the lower vertical frame 10.10.

Reference numeral 11 denotes an upper skeleton frame of the upper backrest portion 5, which, like the lower skeleton frame 7, includes an upper horizontal frame 12 and a lower horizontal frame 1.
3 and upper vertical frames 14 and 14 that connect and fix both ends of the upper horizontal frame 12 and the lower horizontal frame 13, respectively, to form a rectangular frame shape.

A vertically long mounting plate 15.15 is fixed to the lower vertical frame 10.10, and a vertically long lower movable bracket (16.16) is attached to the lower end of each of the mounting plates 15.15 by bolts 17, etc. Fix it by.

The lower portion of each of the lower movable brackets 16.16 is connected to a lower fixed bracket fixed to the rear side of the seat 2.
8 and 18, respectively, so as to be rotatable in the front-rear direction.

The left and right lower moving brackets! 6 and the lower fixing bracket 18, there is provided a lower Taumel mechanism 19, 19 constituting a reclining mechanism A for adjusting the inclination angle of the lower backrest 4.

The lower part of the lower movable bracket 16 is bent into a cross-sectional shape and has a circular recess 20 in side view (Figs. 83 and 4), and internal teeth 21 are provided on the inner peripheral surface of the recess 20. Form.

Said lower fixed bracket! 8 is formed with a convex portion 22 having a cross-sectional shape that projects outwardly with a smaller diameter than the concave portion 20, and peripheral teeth 23 are formed on the outer periphery of the convex portion 22.

The concave portion 20 is fitted into the convex portion 22 so that the outer tooth 23 partially meshes with the inner tooth 21 (FIG. 3).

A fitting hole 24 is formed in the center of the convex portion 22 (Fig. 4).
A fitting hole is formed in the center of the recess 20, and a lower rotating shaft 26 in the left and right direction is formed in the fitting hole 24 and the fitting hole 25.
Insert and fit.

The lower rotating shaft 26 has a large-diameter shaft portion 27 and a small-diameter camshaft portion 28 (Fig. 4), the small-diameter camshaft portion 28 is formed eccentrically with respect to the large-diameter shaft portion 27, and the large-diameter shaft portion n is fitted into the fitting hole 24, and the small diameter camshaft portion 28 is fitted into the fitting hole 25.

The small diameter camshaft 28 rotates eccentrically with respect to the large diameter shaft n, thereby exerting a cam action that moves the inner teeth 21 while meshing with the outer teeth 23 (FIG. 8).

As shown in FIG. 3, a drive gear 29 is fixed to the outer end of the large diameter shaft part n, and a dial 30 is fixed to the outer end of the large diameter shaft part 27.
to be fixed.

The large-diameter shaft portions 27 of the left and right lower Taumel mechanisms 19 are connected and fixed by a left-right connecting shaft 31, and the connecting shaft 31 operates the left and right lower Taumel mechanisms 19 at the same time.

Reference numeral 32 denotes a reinforcing plate provided inside the lower fixing bracket 18, and the lower fixing bracket 18 is held between the lower movable bracket 16 and the reinforcing plate 32 from the left and right sides. 3
Reference numeral 3 denotes a presser pin that presses down the lower end of the lower movable bracket 16, and the lower end of the lower movable bracket 16 is held down by the lower fixing bracket 18.

As described above, the lower Taumel mechanism 19 includes the recess 20 of the lower movable bracket 16, the inner teeth 21 on the inner peripheral surface of the recess 20, and the protrusion 2 of the lower fixed bracket 18.
2, outer peripheral teeth 23 formed on the outer periphery of the convex portion 22, and the lower rotating shaft 26.

Thus, each of the upper end portions of the mounting plate 15.15 is provided with a vertically elongated upper fixing bracket (41.41) and a lower portion of the upper fixing bracket (41.41) fixed thereto (FIG. 3).
1 is an upper movable bracket fixed to the upper vertical frame 14.14 of the upper skeleton frame 11) 42.
42 so as to be rotatable in the front and rear directions.

Between the left and right upper fixed brackets 41 and upper movable brackets 42, there is an upper reversing Taumel mechanism 40 constituting an upper back tilting mechanism B that tilts the upper backrest 5 forward with respect to the lower backrest 4. .40 respectively (second
figure).

The upper backrest tilting mechanism B is such that when the entire backrest seat 3 is rotated backward by the lower Taumel mechanism 19, the lower backrest portion 4 tilts backward, but the upper backrest portion 5 conversely falls forward. It is a mechanism that allows

As shown in FIG. 5, a recess 43 having a cross-sectional shape is formed in the upper part of the upper fixing bracket 41, and internal teeth 44 are formed on the inner peripheral surface of the recess 43. A protrusion 45 having a cross-sectional shape that protrudes outward is formed on the outer surface of the upper movable bracket 42, and outer circumferential teeth 46 that partially mesh with the inner circumferential teeth 44 are formed on the outer periphery of the protrusion 45.

A fitting hole 47 is formed at the center of the recess 43 , a fitting hole 48 is formed at the center of the convex portion 45 , and the large diameter cam shaft portion 50 of the upper rotating shaft 49 is fitted into the fitting hole 48 . The small diameter cam shaft portion 51 is fitted into the fitting hole 47, and the large diameter cam shaft portion 50 is fitted into the fitting hole 47.
is eccentric with respect to the small diameter shaft portion 51. The upper rotating shaft 4
An end of a connecting shaft 52 is fixed to the inner end of the connecting shaft 9, and the upper reversing Taumel mechanisms 40 on both left and right sides are operated simultaneously by the connecting shaft 52.

As described above, the upper reversal mechanism 40 includes the recess 43 of the front soil fixing bracket 41, the internal teeth 44 formed on the inner peripheral surface of the recess 43, and the upper movable bracket 42.
a convex portion 45 and outer peripheral teeth 46 formed on the outer periphery of the convex portion 45.
and an upper rotating shaft 49.

However, the upper reversing Taumel mechanism 40 and the lower Taumel mechanism 19 are different in the relationship between the inner teeth and the outer teeth. Since the teeth 46 are formed, even if the lower rotating shaft 26 of the lower Taumel mechanism 19 and the upper rotating shaft 49 of the upper reversing Taumel mechanism 40 rotate in the same direction (FIGS. 8 and 9), the lower Taumel mechanism 1
9, when the lower backrest part 4 is tilted back as shown in Fig. 9,
The upper reversing Taumel mechanism 40 causes the upper movable bracket 42 to fall forward.

A passive gear 53 is fixed to the outer end of the upper rotating shaft 49, and a rotational transmission member 54 constituted by a timing belt is hooked between the passive gear 53 and the driving gear 29 to rotate the upper rotating shaft. The Taumel mechanism 40 is connected to the lower Taumel mechanism 1.
Link with 9.

This rotation transmission mechanism may be any type, for example, a bevel gear 57.5 is connected to the lower rotation shaft 26 and the upper rotation shaft 49.
7 and bevel gear 5 between bevel gears 57 and 57.
Alternatively, a rotary transmission shaft 59 having a fixed rotation transmission shaft 58 may be provided.

Reference numeral 55 indicates a reinforcing plate provided inside the upper movable bracket 42, and 56 indicates an abutment pin that abuts on the upper end of the upper fixed bracket 41, and presses the upper part of the upper fixed bracket 41 against the movable bracket 42 side.

In addition, in the relationship between the inner peripheral teeth 21 and the inner peripheral teeth 44 and the outer peripheral teeth 23 and the outer peripheral teeth 46, the number of teeth and the pitch are different, or the driving gear 29 and the passive gear 5 are different.
By changing the gear ratio of 3, the ratio of forward tilting of the upper backrest 5 can be changed.1 For example, when the lower backrest 4 is reclined backwards, the upper backrest 5 is It is also possible to move the seat in parallel in this state, or to make the lower backrest 4 suddenly fall forward relative to the rearward reclining state.

(effect) Next, we will discuss the effect.

The present invention has the above-mentioned configuration, and the backrest sheet 3 is vertically divided into a lower backrest part 4 and an upper backrest part 5, and the lower movable bracket 16 of the lower frame 7 of the lower backrest part 4 is The lower movable bracket 16 is pivotally fixed to the lower fixed bracket 18 of the seat 2 so as to be rotatable back and forth, and the lower movable bracket 16 is formed with inner peripheral teeth 21, which are connected to the outer peripheral teeth 23 of the lower fixed bracket 18. Therefore, when a person sits on the vehicle seat 1 and rotates the dial 30 of the reclining mechanism A, the lower rotating shaft 26 rotates, and the small diameter cam shaft portion 28 of the lower rotating wheel 26 rotates. The inner peripheral teeth 21 of the lower movable bracket 16 rotate eccentrically with respect to the shaft part n, and the inner peripheral teeth 21 of the lower movable bracket 16 are rotated by the outer peripheral teeth 23 due to the cam action caused by the eccentric rotation of the small diameter cam shaft part 28.
The lower moving bracket 7 is rotated clockwise as shown in FIG. 8 while engaging with the lower rotating shaft 26, and the lower moving bracket 7 is rotated rearward around the large diameter shaft portion 27 of the lower rotating shaft 26, thereby tilting the lower backrest portion 4 rearward. .

Thus, the upper backrest 5's upper skeleton frame 11 is pivotally fixed to the upper part of the lower skeletal frame 7 of the lower backrest 4 via the upper backrest inclination mechanism B so as to be rotatable back and forth. The tilting mechanism B has internal teeth 44 formed on the upper fixed bracket 41 of the lower skeletal frame 7 and outer teeth 46 formed on the upper movable bracket 42 of the upper skeletal frame 11. The rotation of the drive gear 29 rotates, and the rotation of the drive gear 29 is transmitted to the passive gear 53 by the rotation transmission member 54, and the passive gear 53 rotates the upper rotating shaft 49 of the upper reversing Taumel mechanism 40 of the upper backrest tilting mechanism B As the upper rotating shaft 49 rotates around its small diameter shaft portion 51, the large diameter cam shaft portion 50 of the upper rotating shaft 49 rotates eccentrically and rotates while meshing the outer teeth 46 with the inner teeth 44. do.

In this case, the upper reversing Taumel mechanism 40 is different from the lower Taumel mechanism 19 in the opposite structure in terms of the relationship between the inner peripheral teeth and the outer peripheral teeth, so the outer peripheral teeth 46 themselves are different from those of the lower Taumel mechanism 19 as shown in FIG. Lower rotating shaft 2 of lower Taumel mechanism 19
6, it rotates clockwise, but this rotation causes the outer tooth 46 to rotate clockwise.
moves counterclockwise along the inner peripheral teeth 44.

Therefore, due to the counterclockwise movement of the outer peripheral teeth 46, the upper movable bracket 42 is tilted forward with respect to the upper fixed bladder 2 41, and the upper movable bracket 42 is tilted forward with respect to the upper vertical frame 14 of the upper skeleton frame 11. Then, the upper backrest portion 5 is caused to fall forward via the upper skeleton frame 11.

Therefore, when the lower backrest 4 tilts backward, the upper backrest 5 falls forward, and the upper back of the seated person is supported by the upper backrest 5, maintaining a comfortable posture.

(Effects) Conventionally known Japanese Patent Application Laid-Open No. 60-193729 discloses a seat that is composed of a seat attached to the vehicle body side and a back seat that is attached to the rear of the seat so as to be rotatable back and forth. The seat is divided into a lower backrest portion and an upper backrest portion, the lower backrest portion is pivotally fixed to the seat so as to be rotatable back and forth, and the upper backrest portion is connected to the lower backrest portion. The vehicle backrest seat is configured such that the lower backrest portion is pivoted so as to be rotatable back and forth, and when the lower backrest portion is rotated back and forth, the upper backrest portion is rotated back and forth in conjunction with the rotation of the lower backrest portion. In a vehicle backrest seat, a parallel link mechanism is provided in which a bracket a of a seat and an arm C of the upper backrest frame b are connected by a connecting rod e parallel to the lower backrest frame d. A device for adjusting the inclination angle of the upper backrest is described (see FIG. 13).

In the known device, the inclination angle adjustment device of the upper backrest portion is as follows:
Since the bracket a of the seat and the arm C of the paired upper backrest frame b are connected in a parallel link mechanism by the lower backrest frame d, which also serves as a rod, and the connecting rod e, the lower The backrest frame d is connected to the connecting rod e
When the arm C rotates to the left in the figure, the upper backrest frame b gradually tilts forward. However, in the above configuration, the connecting rod e has no tensile strength, but has a large compressive strength. There's no other way but to do it,
I'm worried because it's difficult to make it thicker.

However, the present invention includes a seat 2 attached to the vehicle body side,
It consists of a backrest sheet 3 attached to the rear part of the seat 2 so as to be rotatable back and forth, and the backrest sheet 3 has a lower backrest section 4.
and an upper backrest part 5, the lower backrest part 4 is pivotally fixed to the seat 2 so as to be rotatable back and forth, and the upper backrest part 5 is fixed to the lower backrest part 4. The upper backrest portion 5 is pivoted so as to be rotatable back and forth, and the upper backrest portion 5 rotates back and forth in the opposite direction to the lower backrest portion 4 in conjunction with the lower backrest portion 4 when the lower backrest portion 4 is rotated back and forth. In the vehicle backrest seat configured to do so, the pivot portion between the lower backrest portion 4 and the seat sheet 2 has inner peripheral teeth 21 on the lower backrest portion 4 side and outer peripheral teeth 21 on the seat sheet 2 side. A lower Taumel mechanism 19 that is a tooth 23 is provided, and a shaft stop between the upper backrest portion 5 and the lower backrest portion 4 has outer peripheral teeth 46 on the upper backrest portion 5 side, and the lower backrest portion 4 An upper reversing Taumel mechanism 40 whose sides are internal teeth 44 is provided, and the inner circumferential teeth 2 of the lower Taumel mechanism 19 are
1 and the outer circumferential teeth 46 of the upper reversing Taumel mechanism 40, the rotary transmission member 54 is provided.

Even if a load is applied to the upper backrest portion 5, the outer tooth 46 rotates while meshing with the inner tooth 44 with a slight force, so a rotary transmission member 54 with a simple structure can be used and there are fewer failures. play.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the vehicle seat, Fig. 2 is a perspective view of the frame of the vehicle seat, Fig. 3 is a longitudinal sectional front view of main parts, Fig. 4 is an assembled perspective view of the lower Taumel mechanism, and Fig. 5 is a perspective view of the frame of the vehicle seat. An assembled perspective view of the upper reversing Taumel mechanism, Fig. 6 is a side view of the lower Taumel mechanism, Fig. 7 is a side view of the upper Taumel mechanism, Fig. 8,
Figure 9 is an explanatory diagram of the action of the Taumel mechanism, Figures 10 to 12
The figure is a working state diagram, FIG. 13 is a diagram of a second embodiment of the rotational transmission mechanism, and FIG. 14 is a known side view. Explanation of symbols■...vehicle seat, 2...seat seat, 3...
Backrest seat, 4... Lower backrest part, 5... Upper backrest part, 6... Reclining mechanism, 7... Lower skeleton frame, 8... Upper horizontal frame, 9... Lower part. Horizontal frame, 10...
・Lower vertical frame, 11... Upper skeleton frame, 12...
Upper horizontal frame, 13... Lower horizontal frame, 14... Upper vertical frame,
15...Mounting plate, 16...Lower moving bracket, 1
7... Bolt, 18... Lower fixing bracket, 19
...lower Taumel mechanism, 20...recess, 21...
Inner tooth, 22... Convex portion, 23... Outer tooth, 24.2
5... Fitting hole, 26... Lower rotating shaft, 27... Large diameter shaft portion, 28... Small diameter cam shaft portion, 29... Drive gear, 30... Dial, 31...・Connection shaft, 32...
Reinforcement plate, 33... Holder pin, 40... Upper reversal Taumel mechanism, 41... Upper fixing bracket, 42...
・Upper movable bracket, 43... Concavity, 44... Inner tooth, 45... Convex part, 46... Outer tooth, 47.48
... Fitting hole, 49 ... Upper rotating shaft, 50 ... Large diameter cam shaft section, 51 ... Small diameter shaft section, 52 ... Connection shaft, 5
3... Gear, 54... Rotation transmission member, 55... Reinforcement plate, 56... Contact pin, 57. 58... Bevel gear, 59... Rotation transmission shaft. Figure 14 Figure 12 Figure 1 Figure 1, Display of the case 1990 Patent Application No. 141978 2, Title of the invention Inclination angle adjustment device 3 of the upper backrest part of a vehicle backrest seat, Case of the person making the correction Relationship between patent applicant representative Yu Yanagibashi - 4, Agent (1) Amend the drawings (Figures 2, 4 to 11, 13, and 14).

Claims (1)

[Claims] It consists of a seat 2 attached to the vehicle body side, and a back seat 3 attached to the rear of the seat 2 so as to be rotatable back and forth,
The backrest seat 3 is divided into a lower backrest part 4 and an upper backrest part 5, and the lower backrest part 4 is pivoted to the seat sheet 2 so as to be rotatable back and forth, and the upper backrest part 4 is rotatably fixed to the seat sheet 2. The canopy part 5 is pivotally fixed to the lower backrest part 4 so as to be rotatable back and forth, and the upper backrest part 5 interlocks with the lower backrest part 4 when it is rotated back and forth. In a vehicle backrest seat configured to rotate back and forth in the opposite direction to the lower backrest portion 4, the lower backrest portion 4 is attached to a shaft stop between the lower backrest portion 4 and the seat seat 2. A lower Taumel mechanism 19 is provided, which has inner peripheral teeth 21 on the side and outer peripheral teeth 23 on the seat 2 side, and the upper backrest part An upper reversing Taumel mechanism 40 is provided, in which the 5 side is an outer peripheral tooth 46 and the lower backrest part 4 side is an inner peripheral tooth 44,
A rotational transmission member 54 is provided between the inner teeth 21 of the lower Taumel mechanism 19 and the outer teeth 46 of the upper reversing Taumel mechanism 40.
An inclination angle adjustment device for an upper backrest portion of a vehicle backrest seat provided with.