JP4215406B2 - Transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission device that moves a vehicle seat by a motor.
[0002]
[Prior art]
In this type of transmission, when the motor is energized, the lead screw is rotated, the lead nut is moved by the rotation of the lead screw, and the sheet moving mechanism coupled to the lead nut moves the seat forward and backward. Things are known.
[0003]
[Problems to be solved by the invention]
In the above transmission device, damper stoppers composed of a metal stopper and a rubber elastic part are fixed to the end of the lead screw, respectively, and the range in which the lead nut collides with the damper stopper is the seat stroke. However, in the case of an electric seat device in which the lead nut is disposed inside the rail member, the stopper portion of the damper stopper that rotates with the lead screw collides with the rail member, resulting in mechanical noise. There was a problem that there was.
[0004]
OBJECT OF THE INVENTION
An object of the present invention is to provide a transmission device having a shock absorbing damper stopper that does not generate abnormal noise even if it interferes with a rail member.
[0005]
[Structure of the invention]
[0006]
[Means for Solving the Problems]
In the transmission device according to the first aspect of the present invention, a lead screw that rotates forward and backward by rotational power generated by a motor, a rail member that is disposed outside the lead screw along the lead screw, and the rail A lead nut member meshed with the lead screw inside the member and driven by rotation of the lead screw; a stopper member disposed inside the rail member; fixed to the lead screw; and the lead nut member A colliding plate member, a main body fixed between the stopper member and the plate member, a stopper member extending from the main body and covering an outer surface of the stopper member facing the rail member; A stopper coating portion disposed integrally, and the rail member of the plate member extending from the main body A plate coating portion that is disposed integrally with the plate member so as to cover the outside of the opposing surface, and is formed to protrude from the main body toward the rail member, and when the lead screw rotates eccentrically, A shock absorbing damper stopper having an elastic member having a rail collision portion capable of colliding is provided.
[0007]
In the transmission device according to claim 2 of the present invention, in addition to the configuration of claim 1, the rail member has a U-shaped cross section having an opening on one surface, and the first rail that supports the lead screw , Having a U-shaped cross section having an opening on a surface opposite to the one surface, being slidably engaged with the first rail in the axial direction, the lead nut member is fixed, and the lead screw is It has the structure which has the 2nd rail covered with this rail.
[0008]
[Effects of the Invention]
In the transmission device according to the present invention, the shock absorbing damper stopper is disposed inside the rail member, and includes a stopper member fixed to the lead screw, a plate member that collides with the lead nut member, and a stopper member and the plate member. Since it has a main body fixed in between and a coating portion that extends from the main body and covers the outer sides of the surfaces of the stopper member and the plate member facing the rail member, it rotates together with the lead screw. At this time, neither the stopper member nor the plate member directly collides with the rail member, and the elastic member mainly collides. Therefore, no mechanical interference sound is generated during driving.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
[0010]
【Example】
1 and 2 show a first embodiment of a transmission according to the present invention.
[0011]
The illustrated transmission device 1 mainly includes a motor 2, a gear box 3, a lead screw 4, a rail member 5, a lead nut member 6, and a shock absorbing damper stopper (hereinafter referred to as a damper stopper) 7. It is used to drive the sheet moving mechanism 30. The seat moving mechanism 30 includes a pair of transmission devices 1, but the other transmission device 1 is not illustrated in FIG. 1.
[0012]
An armature is rotatably accommodated in the motor yoke 2a of the motor 2. The armature shaft provided in the armature is inserted into the gear box 3 and connected to the input portion of the speed reduction mechanism. An output portion of the speed reduction mechanism is connected to a first shaft end portion 4 c formed on the lead screw 4. Since the motor 2 is electrically connected to a sheet drive circuit (not shown), when the sheet advance switch provided in the sheet drive circuit is turned on, the lead screw 4 is rotated in the forward direction. When turned on, the lead screw 4 is reversely rotated.
[0013]
In the lead screw 4, a first shaft end 4c is formed at one end of a lead screw main body 4b in which a screw portion 4a is formed, and a second shaft end 4d is formed at the other end of the lead screw main body 4b. Has been. The second shaft end 4d is rotatably supported by a support member (not shown).
[0014]
A lead nut member 6 is engaged with the threaded portion 4 a of the lead screw 4. The lead nut member 6 is fixed to the lower rail 8 provided in the seat moving mechanism 30. The threaded portion 4a of the lead screw 4 has an outer diameter dimension d1. An upper rail 5 is disposed outside the lead screw 4. The upper rail 5 is formed in a U-shaped cross section having an opening on the lower rail 8 side along the length direction of the lead screw 4, and is fixed to the gear box 3 of the motor 2 together with the seat. The upper rail 5 supports the lead screw 4. The upper rail 5 is supported so as to be movable in the front-rear direction on the lower rail 8 by engaging with the lower rail 8. The lower rail 8 is formed in a U-shaped cross section having an opening on the upper rail 5 side, and is fixed to the floor panel of the vehicle body. A nut member 6 is movably disposed inside the upper rail 5. The inner side of the upper rail 5 has a width dimension L1 shown in FIG. The upper rail 5 moves together with the seat, the motor 2 and the lead screw 4 with respect to the lead nut member 6 fixed to the lower rail 8 when the lead screw 4 is rotated. The combination of the upper rail 5 and the lower rail 8 may be reversed.
[0015]
The damper stopper 7 is an end portion of the screw portion 4a of the lead screw 4, and is disposed in a pair on the first shaft end portion 4c side and the second shaft end portion 4d side. FIG. 2 illustrates only one damper stopper 7. The damper stopper 7 includes a metal stopper member 7a, a metal plate member 7b, and a rubber elastic member 7c.
[0016]
In the stopper member 7a, a flange 7a2 is formed at an end portion of the stopper member body 7a1 having a cylindrical shape that is disposed on the lead nut member 6 side. The flange 7a2 has an outer diameter dimension d2 and a width dimension L2. The outer diameter dimension d2 of the flange 7a2 is sufficiently smaller than the inner width dimension L1 of the rail member 5. The stopper member main body 7a1 is fixed by crimping the threaded portion 4a of the lead screw 4.
[0017]
The plate member 7b has an annular plate shape, and has an outer diameter d3 that is substantially the same as the outer diameter d2 of the flange 7a2 of the stopper member 7a, and a width L3 that is substantially the same as the width L2 of the flange 7a2. Has been. The outer diameter dimension d3 of the plate member 7b is sufficiently smaller than the inner width dimension L1 of the upper rail 5. The plate member 7b has an inner diameter d4 that is slightly larger than the outer diameter d1 of the threaded portion 4a of the lead screw 4.
[0018]
The elastic member 7c is integrally provided with an elastic member main body 7c1, a rail collision portion 7c2, a stopper member coating portion 7c3, and a plate member coating portion 7c4 that form an annular plate shape.
[0019]
The elastic member main body 7c1 has an annular plate-like appearance, and has a width dimension L4 larger than the width dimension L2 of the flange 7a2 and the width dimension L3 of the plate member 7b. The elastic member body 7c1 is slightly larger than the outer diameter d1 of the threaded portion 4a of the lead screw 4 and has an inner diameter d4 that is substantially the same as that of the plate member 7b.
[0020]
The rail collision portion 7c2 is disposed on the outer edge portion of the elastic member main body 7c1. The rail collision portion 7c2 is formed to protrude toward the outer periphery of the curved elastic member body 7c1. The rail collision portion 7c2 has an outer diameter dimension d5. The outer diameter d5 of the rail collision portion 7c2 is slightly smaller than the inner width L1 of the upper rail 5, and is larger than the outer diameter d2 of the flange 7a2 of the stopper member 7a and the outer diameter d3 of the plate member 7b.
[0021]
The stopper member coating portion 7c3 is formed in a thin plate shape on the lead nut member 6 side of the rail collision portion 7c2 so as to cover the outer edge portion of the stopper member 7a. The stopper member coating 7c3 has an outer diameter d6. The outer diameter dimension d6 of the stopper member coating part 7c3 is slightly smaller than the outer diameter dimension d5 of the rail collision part 7c2.
[0022]
The plate member coating portion 7c4 is formed in a thin plate shape on the side opposite to the lead nut member 6 of the rail collision portion 7c2 so as to cover the outer edge portion of the plate member 7b. The plate member coating portion 7c4 has the same outer diameter d6 as the stopper member coating portion 7c3. The outer diameter d6 of the plate member coating part 7c4 is slightly smaller than the outer diameter d5 of the rail collision part 7c2.
[0023]
In the damper stopper 7, the lead screw 4 moves with the sheet while rotating, and the impact force when the plate member 7b collides with the lead nut member 6 at the stroke end of the sheet is mainly caused by the elastic member body 7c1 of the elastic member 7c. By being absorbed, the impact force at that time is alleviated. Further, while the lead screw 4 rotates and moves with the sheet, the rail collision portion 7c2 protruding and arranged outside the stopper member 7a and the plate member 7b is in sliding contact with the inside of the rail member 5, so that the stopper member 7a and the plate Since none of the members 7b directly collide with the rail member 6, no mechanical interference sound is generated during driving.
[0024]
【The invention's effect】
As described above, according to the transmission device according to the present invention, the shock absorbing damper stopper is disposed inside the rail member, the stopper member fixed to the lead screw, and the plate member that collides with the lead nut member. A main body fixed between the stopper member and the plate member, and a coating portion extending from the main body and covering the outer sides of the surfaces of the stopper member and the plate member facing the rail member, Therefore, when rotating together with the lead screw, neither the stopper member nor the plate member directly collides with the rail member, and the elastic member mainly collides. Therefore, no mechanical interference sound is generated during driving. Therefore, even if it interferes with the rail member, there is an excellent effect of having a damper stopper that does not generate abnormal noise.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a first embodiment of a transmission according to the present invention.
2 is a cross-sectional view illustrating an assembly relationship between a lead screw and a damper stopper in the transmission shown in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transmission apparatus 2 Motor 4 Lead screw 5 (Rail member) (1st rail) Upper rail 6 Lead nut member 7 Shock damper damper 7a Stopper member 7b Plate member 7c Elastic member 7c1 (Main body) Elastic member main body 7c2 Rail collision part 7c3 (Coating part) Stopper member coating part 7c4 (Coating part) Plate member coating part 8 (Rail member) (Second rail) Lower rail

Claims (2)

A lead screw that rotates forward and backward by the rotational power generated by the motor;
A rail member disposed outside the lead screw along the lead screw;
A lead nut member meshed with the lead screw inside the rail member and driven by rotation of the lead screw;
A stopper member disposed inside the rail member and fixed to the lead screw;
A plate member that collides with the lead nut member;
A main body fixed between the stopper member and the plate member;
A stopper coating that extends from the main body and covers the outside of the surface of the stopper member that faces the rail member, and is disposed integrally with the stopper member; and the rail member of the plate member that extends from the main body A plate coating portion that is disposed integrally with the plate member so as to cover the outside of the surface that faces the rail member, and protrudes from the main body toward the rail member, and the rail member when the lead screw rotates eccentrically. And a shock absorbing damper stopper having an elastic member having a rail collision portion capable of colliding with the power transmission device. The rail member has a U-shaped cross section having an opening on one surface, and a first rail that supports the lead screw;
It has a U-shaped cross section having an opening on the opposite surface to one surface, is slidably engaged with the first rail in the axial direction, a lead nut member is fixed, and the lead screw is The transmission device according to claim 1, further comprising a second rail that covers the first rail.

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