JPH0336295Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a reclining device that adjusts the inclination angle of a seat back of an automobile, etc. More specifically, the invention relates to a reclining device that adjusts the inclination angle of a seat back of an automobile, etc. The present invention relates to a reclining device that adjusts the reclining angle by converting the tilting motion of the upper arm through the tilting motion.

(Prior Art) A reclining device has already been proposed in which a chain transmission device is used and an operating handle is disposed at a position away from the center of tilting of the seat bag. In the case of such a configuration, since the operation handle can be placed at an optimal position, there is an advantage that operability when adjusting the reclining angle is improved. By the way, in this type of reclining device, when vibration or the like is applied to the seat, the chain vibrates greatly. Therefore, in conventional devices, the chain guide is fixedly attached to the lower arm to suppress its vibration.

(Problem that the invention attempts to solve) However, the chain guide in conventional equipment
As mentioned above, it is a fixed chain guide that is integrally fixed to the lower arm, and cannot cope with the loosening of the chain due to variations in parts and assembly accuracy, or the loosening of the chain due to long-term use.
At times, there were problems with the chain's vibration becoming excessive, causing the chain to come off the sprocket and making loud noises.

The present invention was developed in view of the above problems, and its purpose is to provide a reclining device that can suppress chain vibration to a minimum, that is, a reclining device that can prevent the chain from coming off and reduce the generation of abnormal noise. be.

(Means for Solving the Problems) The present invention which solves the above problems has a lower arm fixed to the seat cushion side, an inner gear and an upper arm having a through hole concentric with the inner gear and fixed to the seat back side. an outer gear meshing with the inner gear of the upper arm; a sub-plate fixed to the lower arm having a through hole concentric with the outer gear; a concentric portion and an eccentric portion rotating in the through hole of the sub-plate and the through hole of the upper arm; a rotating shaft that is movably inserted through the shaft and whose concentric portion is rotatably supported by the lower arm;
An operating handle rotatably attached to the lower arm, a sprocket provided on each of the operating handle side and the rotating shaft side, and a sprocket between the operating handle side sprocket and the rotating shaft side sprocket. a chain hung parallel to the chain, an idler provided so as to be slidable in a direction intersecting the tensioning direction of the chain, a hook secured to the idler, and the hook moved in a direction in which the tension of the chain increases. The reclining angle is adjusted by converting rotation of the operating handle into tilting of the upper arm via the chain and gear train.

(Function) In the reclining device of the present invention, the idler biased by the tension spring constantly presses a part of the chain in a direction that intersects with the chain tensioning direction, in other words, in a direction that increases the tension of the chain. There is. Therefore, slack in the chain due to parts and assembly accuracy and over time is quickly absorbed, so the chain does not come off and the occurrence of abnormal noise is reduced.

(Example) Hereinafter, an example of the present invention will be described in detail using FIGS. 1 to 8. In these figures, 1
2 is a lower arm that is fixed to the seat cushion side (seat cushion frame) with screws, etc., and 2 is an upper arm that is similarly fixed to the seat back side (seat back frame). The Atsupah arm 2
An inner gear 2a is embossed on one side by precision press processing or the like. Further, holes 2e and 5f are drilled in the upper part of the upper arm 2 at the attachment position to the seatback frame as attachment holes to the seatback frame. Reference numeral 3 denotes a sub-plate disposed adjacent to the upper arm 2. An outer gear 3a is embossed on the side surface of the upper arm 2 facing the inner gear 2a by precision press machining or the like, and the lower part thereof is attached to the lower arm 1 by a rivet 4. It is fixed. The number of teeth of the inner gear 2a is selected to be at least one more than the number of teeth of the outer gear 3a.

5 is an eccentric portion 5a and a concentric portion 5 connected thereto;
b, 5c, etc., with an eccentric portion 5a
is rotatably inserted into the center hole of the upper arm 2, the concentric portion 5b is rotatably inserted into the bush 6 of the lower arm 1, and the concentric portion 5c is rotatably inserted into the center hole of the sub-plate 3. It is inserted. Furthermore, the end of this rotating shaft 5 (the concentric part 5c side)
A sprocket 7 is attached to the rotary shaft 5 so as to rotate together with the rotary shaft 5. With the above configuration, the inner gear 2a of the upper arm 2
and the outer gear 3a of the sub-plate 3 mesh,
A planetary gear mechanism is formed.

Reference numerals 8 and 9 denote hook members that are locked to the upper arm 2, and their heads 8a and 9a regulate the distance between the lower arm 1 and the sub-plate 3. The body portion 9b of the hook member 9 also functions as a stopper for regulating the adjustment range of the reclining angle. That is, the body 9b of the hook member 9 is located in the notch 3e of the sub-plate 3, and allows the upper arm 2 to tilt within the range where the front end 3f and rear end 3g of the notch 3e contact the copper part 8b. are doing. or,
Reference numeral 10 denotes a ring made of an elastic member (rubber, synthetic resin, etc.), which is disposed between the lower arm 1 and the upper arm 2 to accommodate the play in the lateral direction shown in FIG. Furthermore, 11 is a cover plate attached to the lower arm 2 with a plurality of pins 12.

A brake mechanism 13 is attached to the lower arm 1 (see especially FIGS. 3 and 4), and an operating handle 4 is attached to one end of the handle shaft of the brake mechanism 13.

In this brake mechanism 13, a stopper case 15 is riveted to the lower arm 1 while being fitted into a hole 1a of the lower arm 1;
The cover bracket is riveted to the cover bracket. A handle shaft 17 is inserted into each central hole of the stopper case 15 and cover bracket 16, and the handle shaft 7 is rotatably supported there. A partially cutout core 17a is provided near the end of the handle shaft 17 on the stopper case 15 side, and a serration portion 17b for attaching the operating handle 14 is provided near the end on the cover bracket 16 side. It is provided. 18 is a sprocket shaft rotatably inserted into the handle shaft 17;
A tongue portion 1 that enters the notch of the core 17a at one end
8a, and a sprocket 18b on the outer periphery. Reference numeral 19 denotes a stopper spring (coil sling) disposed within the stopper case 15 so as to be in pressure contact with the inner wall of the stopper case 15, and both ends thereof are bent inward to form a hook 19a. Here, the core 17a is attached to the hook 19a.
The hook 19a is located in a space inside the bent portion, and the tongue portion 18a is located in a space outside the bent portion of the hook 19a.

20 is a chain wound between the sprocket 18b and the sprocket 7;
An idler 21 having a similar shape to a sprocket is in contact with (engages with) the intermediate portion of the sprocket. Reference numeral 22 denotes a stepped pin into which the idler 21 is rotatably inserted, the ends of which are loosely inserted into the elongated hole 1a of the lower arm 1 and the elongated hole 11a of the cover plate 11, and are prevented from coming off by an E-ring 23. being done. The elongated holes 1a and 11a have the same shape as shown in FIGS. 6 and 7, and their longitudinal direction is selected to be perpendicular to the direction in which the chain 20 is stretched. Therefore, the idler 21 is supported so as to be slidable in the longitudinal direction of the elongated holes 1a and 11a. 2
Reference numeral 4 designates a hook having a shape as shown in FIG. 8, and is made of wire rod in order to reduce costs. A pair of arcuate ends 24a of this hook 24 are located above the small diameter circumferential end 21a of the idler 21 (see FIG. 1).
sliding into contact with. Also, the folded portion 24b of the hook 24
One end of a tension spring 25 is hooked to. The other end of the tension spring 25 is hooked to a hook 1b formed by cutting and raising a portion of the lower arm 1. This hook 1b is located on the downward extension of the elongated holes 1a and 11 (see FIGS. 1 and 5).

The operation of the reclining device configured as described above will be explained next. First, when the operating handle 14 is rotated, the handle shaft 17 and the core 17a formed integrally therewith also rotate. Immediately after this rotation starts, the hook 19a of the stopper spring 19 comes into contact with the notched end of the core 17a, but the diameter of the stopper spring 19 is reduced and the stopper case 15
Since the contact resistance with the handle shaft 17 is reduced,
The rotation of the sprocket shaft 18 is performed smoothly, and the sprocket shaft 18 also rotates together with the handle shaft 17 by the tongue portion 18a. Therefore, the rotating shaft 5 rotates via the chain 20, and the upper arm 2 also rotates with a constant reduction ratio due to the planetary gear mechanism. Therefore, the reclining angle can be adjusted within the range where the front and rear ends 3f and 3g of the notch 3e of the sub-plate 3 come into contact with the trunk 9b of the hook member 9. In the reclining device having the above configuration, even if a rotational force is generated to cause the rotation shaft 15 to rotate due to vibration or the like, the rotational force is
Since the outer diameter of the stopper spring 19 is expanded through the tongue portion 18a of the sprocket shaft 18 to increase the pressing force between the stopper spring 19 and the stopper case 15, the rotary shaft 5 cannot rotate.

Moreover, in this configuration, the tension spring 25
is constantly urging the idler 21 downward in FIGS. 1 and 5 via the hook 24. Therefore, the chain 20 is pressed by the idler 21 and is always kept under sufficient tension. Therefore, the chain 20 does not become slack.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible. For example, idler 21
The mounting position may be any other location as long as the slack in the chain 2 can be taken up. Furthermore, if the sub-plate 3 is configured to be rotatable with respect to the lower arm 1, the reclining angle can be easily roughly adjusted.

(Effects of the invention) As explained above, according to the invention, the idler biased by the tension spring moves a part of the chain in a direction that intersects with the direction in which the chain is tensioned, in other words, the tension in the chain increases. It is constantly pressed in the direction of Therefore, slack in the chain due to parts and assembly precision and over time is quickly absorbed, so the chain does not come off and the occurrence of abnormal noise is reduced.

[Brief explanation of drawings]

Figure 1 is an enlarged cross-sectional view of AA in Figure 5, Figure 2 is an enlarged cross-sectional view of BB in Figure 5, Figure 3 is an enlarged cross-sectional view of CC in Figure 5, and Figure 4 shows the main parts of Figure 3. Exploded perspective view,
FIG. 5 is a block diagram of a main part showing an embodiment of the present invention, FIG. 6 is a partial explanatory diagram of a lower arm, and FIG. 7 is a partial explanatory diagram of a cover plate. FIG. 8 is an explanatory view of the hook, with A being a front view and B being a side view. 1...Lower arm, 2...Atsupa arm, 2a
...Inner gear, 3...Sub plate, 3a...
Outer gear, 5... Rotating shaft, 5a... Eccentric part, 5b, 5c... Concentric part, 7... Sprocket, 1... Cover plate, 12... Pin, 13...
...Brake mechanism, 14...Operation handle, 15...
...Stopper case, 16...Cover bracket,
17...handle shaft, 18...sprocket shaft,
18b...Sprocket, 19...Stopper spring, 20...Chain, 21...Idler,
22...Pin, 23...E ring, 24...Hook, 25...Tension spring.

Claims (1)

[Scope of utility model registration request] A lower arm fixed to the seat cushion side, an upper arm fixed to the seat back side having an inner gear and a through hole concentric with the inner gear, an outer gear meshing with the inner gear of the upper arm and a through hole concentric with the outer gear. and a sub-plate fixed to the lower arm, a concentric part and an eccentric part rotatably inserted into the through-hole of the sub-plate and the through-hole of the upper arm, and the concentric part is rotatably supported by the lower arm. a rotating shaft, an operating handle rotatably attached to the lower arm, a sprocket provided on each of the operating handle side and the rotating shaft side, a sprocket on the operating handle side, and the rotating shaft. A chain hung parallel to the sprocket on the shaft side, an idler provided so as to be slidable in a direction crossing the direction in which the chain is tensioned, a hook locked to the idler, and a tension of the chain. A reclining device comprising a tension spring that biases the hook in an increasing direction, converting rotation of the operating handle into tilting of an upper arm via the chain and gear train to adjust the reclining angle.