JP2001343057A - Linkage operative apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an inexpensive nut member which has high critical fracture strength. SOLUTION: End faces 62b of a boss section 62a of a nut member 62 is set face-to-face with an inner face 77a of a bracket 77 with a small clearance α, and also it is so constructed that the end face 62b is moved in contact with the inner face 77a when an excessive load is acting upon a screw rod 61, thereby eliminating the portion where the mode changes from compression to tensile load within the nut member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlocking operation device applied to a seating position adjusting device.

[0002]

2. Description of the Related Art Conventionally, as this kind of linked operation device 90, one shown in FIG. 5 is generally known.
This includes a nut member 91 linked to the drive mechanism 95,
It has a screw rod 92 screwed with the nut member 91 and linked to the driven member, a housing 93 that accommodates the nut member 91 and rotatably supports the nut member 91, and a mounting bracket 94. And the driving mechanism 9
The nut member 91 is rotated by the driving of the nut 5, and the screw rod 92 is moved in the axial direction by the rotation of the nut member 91, so that the driven member is moved. In such a drive mechanism 90, an end face 91 a of a portion formed with a female screw to be screwed with the screw rod 92 of the nut member 91 is formed.
Is opened through the hole 94a of the mounting bracket 94 to the outside of the mounting bracket 94.

[0003]

However, in the above-mentioned conventional apparatus, when applied to, for example, a vertical apparatus for adjusting the height of a seating surface of a seat, an excessive load from a seat belt is applied in an emergency or the like. , An excessive load acts on the screw rod 92 in the direction of F shown in FIG. As a result, in FIG.
In section a, a tensile load was applied from the female screw, and in section b, a compressive load was applied. When the breaking condition was observed in the critical strength test, the specimen broke at section e where the load mode changed from compression to tension.

[0004] Therefore, the present invention eliminates the part where the mode changes from compression to tensile load in the nut member when an excessive load is applied, so that the compressive load is applied to all parts, so that the strength is increased. It is an object of the present invention to realize an inexpensive linked operating device at a low cost.

[0005]

Means for Solving the Problems To solve the above technical problems, the technical means taken in the present invention is to provide a gear box for accommodating a nut member having a female screw portion extending axially, A coupling actuating device having a screw rod screwed with a screw portion, wherein one of the nut member and the screw rod is coupled to a drive mechanism;
The axial end surface of the nut member and the inner surface of the gear box are opposed to each other with a gap therebetween, and when a load of a certain value or more is applied to the screw rod, the axial end surface of the nut member and the inner surface of the gear box come into contact with each other. That is to say,

[0006] According to this technical means, a compressive load is applied to all portions of the nut member, and it is possible to realize a higher-strength linked operation device at low cost.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 and 2, a linkage operating device 6 according to the present invention will be described with reference to an example applied to a rear vertical mechanism 3 of a seating position adjusting device 80. FIG. Naturally, the linkage operating device 4 can be applied to other adjustment mechanisms provided in the seating position adjustment device 80, such as the slide mechanism 1, the front vertical mechanism 2, and the reclining mechanism 9, if necessary.

Next, as shown in FIG. 1, the rear vertical mechanism 3 includes a rotating shaft 31 and links 32 and 33. The rotation shaft 31 is rotatably supported via an arm-shaped bracket 34 fixed to the upper rail 11 of the slide mechanism 1. The link 32 is fixed to the rotation shaft 31, and the tip thereof is rotatably connected to the rear side of the lower arm 92 of the reclining mechanism 9 by the pin 35. The link 33 is fixed to the rotating shaft 31, and a driving mechanism 60 for the rear vertical mechanism is linked to the tip of the link 33 via a linking operation device 6 for the rear vertical mechanism 3.

Next, the structure of the linking operation device 6 of the rear vertical mechanism 3 and the drive mechanism 60 will be described in more detail.

As shown in FIG. 2, the linking operation device 6 of the rear vertical mechanism 3 mainly includes a screw rod 6
1 and a drive mechanism 60, and the reduction gear box 69 of the drive mechanism 60 has a built-in nut member 62 screwed to the screw rod 61. Screw rod 61
Is rotatably connected to the link 33 by a pin 64 at one end thereof. Worm teeth 73 are formed on the outer peripheral surface of the nut member 62. The nut member 62 is accommodated in the reduction gear box 69 so as not to move in the axial direction of the worm teeth 73. Also, the reduction gear box 69
Is composed of a combination of two resin housings 69a and 69b, and a bracket 77 having a substantially U-shape so as to sandwich the housings 69a and 69b from both sides. The bracket 77 and the housings 69a and 69b pass through the respective housings 69a and 69b. They are fastened with three bolts 78 so as to pass through the holes, and are integrally assembled together. Further, the bracket 77 is provided with arm portions 79 at both ends of one side of the substantially U-shape and bent at right angles from the surface thereof. The tip of the arm portion 79 is rotatably supported by a pin 76 with respect to a bracket 75 fixed to the upper rail 11 of the slide mechanism 1. Thus, the reduction gear box 69 is rotatably supported on a surface orthogonal to the axial direction of the screw rod 61.

3 and 4, the drive mechanism 60 is shown in an enlarged manner. Housing 69a, 6 of reduction gear box 69
9b is formed with concentric through holes 69c and 69d. Boss portions 62a are formed on both sides of the nut member 62 so as to protrude around the female screw portion 65, and the boss portions 62a are formed.
Are rotatably supported by being inserted into the through holes 69c and 69d. Further, the screw rod 61 is screwed and inserted into the female screw portion 65 of the nut member 62. Through hole 69
Nut member 62 serving as a fitting support portion for fitting with c and 69d
Of the boss portion 62a extends outside the through holes 69c and 69d,
The tip surface 62b of the boss portion 62a is connected to the housing 69a, 69b.
And is opposed to the inner surface 77a of the bracket 77 having a substantially U-shape with a slight gap α.

Next, the operation of the interlocking operation device 6 of the rear vertical mechanism 3 having the above configuration will be described.

In the rear vertical mechanism, when the nut member 62 is rotated by the operation of the drive mechanism 60 and the screw rod 61 is moved in the axial direction, the link 33 moves in the front-rear direction (the left-right direction in FIG. 1). The rotation shaft 31 is rotated by being pushed and pulled. The rotation of the rotation shaft 31 causes the link 32 to rotate in the vertical direction (the vertical direction in FIG. 1), and as a result, the lower arm 9 of the reclining mechanism 9
2 is moved up and down, and the rear part of the seat cushion (not shown) is moved up and down. On the other hand, when an anchor of a seat belt (not shown) is attached to the point 95 of the lower arm 92 and the occupant changes its position from the seated state to the upper front in an emergency, the point 95 is excessively upward and upward from the seat belt. The load A (FIG. 1) acts. Thus, the link 32 receives a load in the direction B (FIG. 1) and is transmitted to the rotating shaft 31. Further, this load acts to strongly push the screw rod 61 through the link 33 in the direction C in FIGS. As shown in detail in FIG.
When an excessive load acts on the screw rod 61 in the direction C, the nut member 62 also moves in the direction C with the deformation of the members engaged with the nut member 62. On the other hand, the tip surface 62b of the boss portion 62a of the nut member 62 is connected to the housing 69a, 69.
Since the inner surface 77a of the bracket 77 which is attached so as to sandwich b from both sides and constitutes a part of the reduction gear box 69 is opposed to the inner surface 77a with a small gap α, the distal end surface 62b contacts the inner surface 77a. As a result, a compressive force acts on all the nut members 62, and there is no change in the load mode in the nut members 62. Therefore, the strength is greatly improved.

Actually, in order to confirm the effect of the present invention, the following experiment was conducted. That is, as described above, the distal end surface 62b
A comparison test of the limit strength between the improved product having the same dimensions and structure as the conventional product and the conventional linkage operating device, except for the improvement of the structure in which the structure was made to face the inner surface 77a of the bracket 77 with a small gap α. . As a result, in the improved product, no fracture occurred at the portion corresponding to the portion e shown in FIG. 5 which was observed in the conventional product, and all of the products were in the failure mode due to tooth damage. And about 40% improvement in breaking load was obtained. This result has a great effect on the product design in significantly reducing the size and weight of the linkage actuator.

[0015]

According to the present invention, when an excessive load acts on the screw rod, and as a result, an excessive load acts on the nut member, the portion in the nut member where the mode changes from compression to tensile load is changed. Therefore, it is possible to realize an inexpensive linked operation device having higher strength.

[Brief description of the drawings]

FIG. 1 is a perspective view of a power seat device having a cooperative operation device according to the present invention.

FIG. 2 is a side view showing a cooperative operation device according to the present invention.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is a view showing a conventional device.

[Explanation of symbols]

 3 Rear Vertical Mechanism 6 Linking Actuator 61 Screw Rod 62 Nut Member 62a Boss 62b Tip Surface 65 Female Thread Part 69 Reduction Gear Box (Gear Box) 80 Seat Seating Position Adjustment Device

Claims (1)

[Claims] 1. A gear box for accommodating a nut member through which a female screw portion extends axially, and a screw rod screwed with the female screw portion, wherein one of the nut member and the screw rod is provided. In a linkage operating device linked to a drive mechanism, an axial end surface of the nut member and an inner surface of the gear box are opposed to each other with a gap, and when a load equal to or more than a certain value acts on the screw rod,
A cooperative actuator, wherein an axial end surface of the nut member and an inner surface of the gear box are in contact with each other.