JPS5826602Y2 - Reclining seat mechanism - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a reclining seat mechanism.

Seat tilting mechanisms are available for vehicle seats that provide appropriate angular adjustment of the seat and backrest by rotation of gears in a gearing system that locks itself in the adjusted position.

Such a seat is described in British Patent No. 1,091,994, the structure of which includes two hinge plates, one of which carries an internally toothed ring gear and the other plate an eccentric. It has a spur gear mounted for movement and engaged with a ring gear.

In this case, adjustment is achieved by the difference in the number of teeth between the two gears.

The disadvantage of this structure is that the drawing board moves eccentrically and this movement is transmitted to the backrest, so that during use, the backrest will combine the rotational movement with the movement of the axis of rotation, a phenomenon called waltzing J-motion. This is to create a phenomenon similar to floating.

Another structure known from GB 1 170 708 comprises a ring gear on each hinge plate and two spur gears which are rotated simultaneously and eccentrically and which engage two ring gears in each case.

This construction avoids the drawbacks of "waltzing" but is more expensive to fabricate.

Moreover, another structure is described in German patent no. A gear support is provided for mounting four pinions on one circle, one set of four pinions engaging one ring gear and the other set engaging the other ring gear.

This gear support is rotated so that the pinions rotate along their respective ring gears, and rotation is accomplished by other gears engaged with external teeth on the gear support.

Although the pinion used in this construction is easier and cheaper to manufacture, this construction has a total of 12
The disadvantage of having several gears is encountered.

The present invention provides an improved reclining seat mechanism.

That is, the present invention includes first and second hinge plates attached to the seat and the backrest, respectively, and hinged to each other, and an inward-facing hinge plate formed on each hinge plate, one of which has a larger number of teeth than the other. a toothed ring gear, a control gear inserted coaxially with the two ring gears facing each other, and at least two or more gears disposed between the control gear and the two ring gears and meshed with both the gears. a planetary gear; and a handle wheel for rotating the control gear and adjusting the relative angle of the first hinge plate and the second hinge plate, and the difference in the number of teeth between the two wheel gears and the planetary gear. The gist of this is that the numbers are the same.

The following description will be made with reference to the accompanying drawings.

Referring to FIG. 1, the vehicle seat shown here has a seat 11 and a backrest 12, and the backrest 12 is connected to the seat 1.
1 is vertically and angularly adjustable.

Adjustment is performed by the first hinge plate 14 hinged to the second hinge plate 15.
This is performed by a seat tilting mechanism 13 having a.

A first hinge plate 14 is attached to the backrest 12 and a second hinge plate 15 is attached to the seat 11.

In the figure, reference numeral 11 denotes a knob (handle wheel), and as will be described later, the inclination of the backrest is adjusted by manually rotating this knob 1T.

Furthermore, both hinge plates may be provided on opposite sides of the seat, but these need not have adjustment controls.

The hinge axes of plates 14 and 15 are coaxial with the tilt axis of the backrest.

The first hinge plate 14 is formed integrally with a boss defining a first ring gear 20 having internal teeth 21 .

Hinge plate 14 defines a coaxial recess 29 adjacent the boss.

The second hinge plate 15 is a second ring gear 2 having inwardly protruding teeth 23.
It is equipped with 2.

The second ring gear 22 has an annular boss 25 coaxial with the teeth 23, which boss rotatably engages in a recess 26 of the second hinge plate 15. The second ring gear 22 is normally fixed.

Further, the second ring gear 22 has a recess 27 and the first ring gear 2
0 rotatably engages the recess 27.

The recess 29 of the first hinge plate receives and arranges a support 33, which has embossing projections 33a, 33b, 33c.

It has 33d.

The control gear arrangement 35 consists of a control gear 34 with a head 36, which has an auxiliary washer 31 and an elastic packing 3.
I support 8.

The control gear 34 extends through an opening 40 in the support and through an opening 41 in the second hinge plate 15.

Furthermore, a washer 42 is received by the control gear 34 and a bolt 43 engages coaxially within the control gear to secure the support and both hinge plates between this bolt and the head 36.

Prior to assembly, the four planetary gears 45-48 are rotatably engaged with respective projections 33a-33d and meshed with control gear 34, and meshed with both of each planetary gear 20.22.

The first ring gear 20 has more teeth than the second ring gear 22,
The first ring gear has 25 teeth 21 and the second ring gear has 2
It has one tooth 23.

Since the tip circles defined by each set of teeth 21 and 23 are the same, and the difference in the number of teeth between both teeth 21 and 23 is 4,
There are four positions where both ring gears 20 and 22 can mesh with the teeth of the planetary gear at the same time, and these positions are divided into two sets, with two positions located on a straight line in the diametrical direction. It's the location.

Each planetary gear is placed at these positions.

That is, one position where the teeth or gap portions of both ring gears 20, 22 coincide is obtained for each interval divided by the difference in the number of teeth on the circumference.

From this, if the difference in the number of teeth was three instead of four, three planetary gears would be provided.

A knob 17 in the form of a handle wheel is secured to the control gear assembly by a bolt 51 and a washer 52, which bolt engages in a threaded opening 53 of the control gear.

The rotation of the knob 1[gamma] therefore causes a concomitant rotation of the control gear 34 and the planet gears 45-48, the planet gears rotating about their own axes and about the axis of the control gear.

Thereby, the ring gear 20.degree. 22 is effectively generated more relatively angularly, with the arrangement position of the teeth 21.degree. 23 moving slowly around the main hinge axis.

The hinge plates 14, 15 are thus moved angularly together or separately depending on the direction of rotation of the knob 17, resulting in an adjustment of the inclination of the backrest 12.

In vehicles without rear doors, it is necessary to tilt the backrest 12 forward in order to enter and exit the rear of the vehicle.

For such tilting, a lever device 28 is provided separately from the gear device described above.

The stop 67 is connected to the two projections 7 on the hinge plate 14 so as to define the limits of relative angular movement of the two hinge plates 14,15.
Can work with one of 5.76.

In addition, the ring gear 22 has a projection 6 that engages the end of the arm 63.
1, which arm serves as a stop to prevent a forward inclination of the backrest, ie a clockwise angular movement of the hinge plate 14, as can be seen in FIG.

Similarly, the ring gear 22 has a projection 61 which engages a stop 67 to prevent the backrest from tilting backwards.

The arm 63 is spring loaded into engagement with the projection 61 by a spring 66 engaged between the lever 68 and the hinge plate 15.

The lever 68 has a tongue 71 on the part that is engaged with the opening lower portion 1a of the arm for movement of the lever by the arm, and the lever 68 and the arm 63 are pivoted about a common pivot member 65.

The lever further has a portion 69 with a tongue 69a that engages in an elongated slot 77 in the hinge plate 15, which slot γ7 limits the movement of the lever.

Furthermore, a rivet 60 is provided, on which an arm 63 slides.

Swinging of the lever releases the arm 63 from the protrusion 61 to allow the backrest to tilt forward.

In practice, the lever may be swung by remote actuation by means of a linkage or cable connection between the actuator and the lever 68.

The mechanism described above uses several gear wheels and is particularly robust while being inexpensive to manufacture; furthermore, the mechanism can withstand high loads.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the seat tilting mechanism according to the present invention shown in the position of use on a vehicle seat, Fig. 2 is an exploded perspective view showing the seat tilting mechanism according to the present invention in an enlarged manner, and Fig. 3 is a seat tilting mechanism according to the present invention. A side view of the mechanism, FIG. 4 is a cross-sectional view of the seat tilting mechanism taken along line fV-IV in FIG. Explanation of symbols, 11... Seat, 12... Backrest,
13...Seat tilting mechanism, 14.15...Hinge plate,
20.22... Ring gear, 21.23... Inward teeth, 3
4... Control gear, 45-48... Planetary gear, 17.
...knob, 67...stop, 63...arm, 6
8... Lever 69a, 71... Tongue piece, 51... Bolt.

Claims (1)

[Scope of utility model registration request] first and second hinge plates respectively attached to the seat and the backrest and hinged to each other; and a first hinge plate and a second hinge plate, which are formed on each hinge plate and have the same tooth tip circle, and one has a larger number of teeth than the other. a control gear inserted coaxially with the mutually opposing double-wheel gears, and at least two gears disposed between the control gear and the double-wheel gears and meshed with both gears. at least one planetary gear, and a handle for rotating the control gear and adjusting the relative angle of the first and second hinge plates;
A reclining seat mechanism characterized in that the difference in the number of teeth between the two wheel gears and the number of the planetary gears are the same.