JP4534308B2 - Linkage actuator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a linkage operating device applied to a seat seating position adjusting device.
[0002]
[Prior art]
Conventionally, as this type of linkage operating device 90, one as shown in FIG. 5 is generally known. This includes a nut member 91 linked to the drive mechanism 95, a screw rod 92 screwed to the nut member 91 and linked to the driven member, and the nut member 91 received therein and rotatably supported by the nut member 91. And a mounting bracket 94. The nut member 91 is rotated by driving the drive mechanism 95, 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 surface 91 a of a portion of the nut member 91 where a female screw that is screwed with the screw rod 92 is formed passes through the hole 94 a of the mounting bracket 94 and is opened to the outside of the mounting bracket 94.
[0003]
[Problems to be solved by the invention]
However, in the case of the above-described conventional device, for example, when applied to a vertical device that adjusts the height of the seating surface of the seat, when an excessive load from the seat belt acts to lift the seat in an emergency, etc. An excessive load in the direction of F shown in FIG. As a result, in FIG. 5, a tensile load is applied from the female screw in the section a of the nut member 91 and a compression load is applied in the section b. When the fracture condition is observed in the limit strength test, the load mode is changed from compression to tension. It broke at the changing e part.
[0004]
Therefore, the present invention eliminates the portion where the mode changes from compression to tensile load in the nut member when an excessive load is applied, so that the compression load is applied to all portions. The technical problem is to realize the operating device at a low cost.
[0005]
[Means for Solving the Problems]
In order to solve the above technical problem, the technical means taken in the present invention includes a gear box that houses a nut member through which the female screw portion penetrates in the axial direction, and a screw rod that is screwed into the female screw portion. And the nut member and the screw rod are linked to a drive mechanism, wherein the nut member is formed at the axially central portion of the outer peripheral surface, and the axial end surface of the nut member The nut member is rotatably held in the gear box by having a worm tooth having a diameter larger than that of the portion, and having both end surfaces in the axial direction of the worm tooth sandwiched between housings constituting the gear box. together to occur when the inner surface of the axial end face and the gearbox of the nut member, the axial load exceeding a certain value is applied to the screw rod As the inner surface of the axial end face and the gearbox of the nut member by the movement of the serial nut member contacts is that opposed to each other with a gap.
[0006]
According to this technical means, a compressive load is applied to all parts of the nut member, and it is possible to realize a linkage actuator with higher strength at low cost.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Based on FIGS. 1 and 2, the linkage operating device 6 according to the present invention will be described with reference to an example in which the seat seating position adjusting device 80 is applied to the rear vertical mechanism 3. Needless to say, the linkage operating device 4 can be applied to the slide mechanism 1, the front vertical mechanism 2, and the reclining mechanism 9, which are other adjusting mechanisms provided in the seat seating position adjusting device 80, as necessary.
[0008]
Next, as shown in FIG. 1, the rear vertical mechanism 3 includes a rotating shaft 31 and links 32 and 33. The rotating 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 rotary shaft 31, and the tip thereof is rotatably connected to the rear side of the lower arm 92 of the reclining mechanism 9 by a pin 35. The link 33 is fixed to the rotary shaft 31, and a driving mechanism 60 for the rear vertical mechanism is linked to the tip of the link 33 via the linkage operating device 6 for the rear vertical mechanism 3.
[0009]
Next, the relationship between the linkage actuator 6 and the drive mechanism 60 of the rear vertical mechanism 3 will be described in detail.
[0010]
As shown in FIG. 2, the linkage actuating device 6 of the rear vertical mechanism 3 is mainly constituted by a screw rod 61 and a drive mechanism 60, and a reduction gear box 69 of the drive mechanism 60 is a nut member 62 that is screwed into the screw rod 61. Built in. The screw rod 61 is rotatably connected to the link 33 by a pin 64 at one end side thereof. Worm teeth 73 are formed on the outer peripheral surface of the nut member 62. The nut member 62 is housed in the reduction gear box 69 so as not to move in the axial direction of the worm teeth 73. The reduction gear box 69 includes 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 housing 69a, 69b is fastened with three bolts 78 so as to pass through the respective through holes, and is integrally assembled with each other. Furthermore, the bracket 77 is provided with arm portions 79 that are bent and extended in a right-angled direction from both sides of one side of the substantially U-shaped side. A distal end portion 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. Accordingly, the reduction gear box 69 is rotatably supported on a surface orthogonal to the axial direction of the screw rod 61.
[0011]
3 and 4 show the drive mechanism 60 in an enlarged manner. Concentric through holes 69 c and 69 d are formed in the housings 69 a and 69 b of the reduction gear box 69. A boss portion 62a is formed on both sides of the nut member 62 so that the periphery of the female screw portion 65 protrudes. The boss portion 62a is inserted into the through holes 69c and 69d and is rotatably supported. Further, a screw rod 61 is screwed and inserted into the female thread portion 65 of the nut member 62. The boss portion 62a of the nut member 62, which is an insertion support portion for the through holes 69c and 69d, extends to the outside of the through holes 69c and 69d, and the tip surface 62b of the boss portion 62a sandwiches the housings 69a and 69b from both sides. Is attached to the inner surface 77a of the bracket 77 having a substantially U-shape with a slight clearance α.
[0012]
Next, the operation of the interlocking operation device 6 in the rear vertical mechanism 3 having the above configuration will be described.
[0013]
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 is pushed and pulled in the front-rear direction (left-right direction in FIG. 1). And the rotating shaft 31 rotates. The rotation of the rotary shaft 31 causes the link 32 to rotate in the vertical direction (the vertical direction in the drawing in FIG. 1), and as a result, the rear side of the lower arm 92 of the reclining mechanism 9 is moved up and down to move the seat cushion (not shown). C) The rear part moves 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 position of the occupant changes from the seated state to the front and upper direction in an emergency, the point 95 is excessively upward and upward from the seat belt. Load A (FIG. 1) acts. As a result, the link 32 receives a load in the B direction (FIG. 1) and is transmitted to the rotating shaft 31. Further, this load acts to strongly push the screw rod 61 in the direction C in FIGS. 1 and 3 through the link 33. As shown in detail in FIG. 3, when an excessive load acts in the C direction of the screw rod 61, the nut member 62 also moves in the C direction with deformation of each member engaged therewith. On the other hand, the front end surface 62b of the boss portion 62a of the nut member 62 is attached so as to sandwich the housings 69a and 69b from both sides, and is slightly spaced from the inner surface 77a of the bracket 77 constituting a part of the reduction gear box 69. Since they face each other, the tip surface 62b contacts the inner surface 77a. As a result, a compressive force is applied to the nut member 62, and the load mode changing portion in the nut member 62 does not occur, so that a great improvement in strength is achieved.
[0014]
Actually, in order to confirm the effect of the present invention, the following experiment was conducted. That is, an improved product having the same dimensions and structure as those of the conventional product, except for the improvement of the structure in which the front end surface 62b is opposed to the inner surface 77a of the bracket 77 with a slight clearance α as described above, and the conventional linkage actuator. A comparison test of the critical strength was performed. As a result, the improved product did not break at the portion corresponding to the portion e shown in FIG. An improvement of about 40% was obtained in the breaking load. This result has a great effect on the product design in order to achieve a significant reduction in size and weight of the linkage actuator.
[0015]
【The invention's effect】
According to the present invention, when an excessive load is applied to the screw rod and as a result an excessive load is applied to the nut member, the portion where the mode changes from compression to tensile load is eliminated in the nut member, and the strength is further increased. It is possible to realize a high linkage actuator at low cost.
[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 operating device according to the present invention.
FIG. 3 is a partially enlarged view of FIG. 2;
4 is a side view of FIG. 3. FIG.
FIG. 5 is a diagram showing a conventional apparatus.
[Explanation of symbols]
3 Rear Vertical Mechanism 6 Linking Actuator 61 Screw Rod 62 Nut Member 62a Boss Portion 62b Tip Face 65 Female Screw Portion 69 Reduction Gear Box (Gear Box)
80 Seat seating position adjustment device

Claims (1)

A gear box that houses a nut member through which the female screw portion penetrates in the axial direction; and a screw rod that is screwed to the female screw portion, and one of the nut member and the screw rod is linked to a drive mechanism. In the linkage actuator
The nut member has a worm tooth formed at an axially central portion of an outer peripheral surface and configured to have a diameter larger than an axial end surface portion of the nut member, and both axial end surfaces of the worm tooth are the gear box. And the nut member is rotatably held in the gear box, and the axial end face of the nut member and the inner surface of the gear box are subjected to an axial load of a certain value or more. A linkage actuating device, wherein the nut member is caused to move with a gap so that the axial end surface of the nut member and the inner surface of the gear box come into contact with each other due to the movement of the nut member that occurs when acting on the screw rod.

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