JP3233763B2 - Power seat device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power seat and, more particularly, to a vehicle power seat device suitable for driving the power seat.

[0002]

2. Description of the Related Art Conventionally, in a vehicle power seat apparatus of this type, as disclosed in Japanese Patent Publication No. 4-70172, for example, a space is provided on a floor surface in a vehicle cabin in the front-rear direction and in the left-right direction. A pair of left and right seat rails is fixed and the power seat is mounted on both seat rails such that the left and right ends thereof are fixed on the upper rails of the respective seat rails. Then, the nut is non-rotatably held at an intermediate portion of the upper rail via a bracket on the outer side of the inner side wall of the upper rail, and a screw shaft screwed to the nut has its front and rear ends at each end. Each of the lower rails is rotatably supported by front and rear ends of one of the lower rails via a bracket, and is held parallel to and outside the inner wall side wall of the same lower rail. The motor is supported on the front end of one of the lower rails via a bracket so that its rotation axis is orthogonal to the screw axis. further,
A worm wheel is supported by the front end of the screw shaft so as to be relatively non-rotatable and relatively movable in the axial direction in a housing fixed on the bracket supporting the motor as described above. A meshing worm gear is supported by a rotating shaft of the motor in the housing. Thus, when the motor rotates forward or reverse, the worm gear rotates forward or reverse, the worm wheel rotates similarly, the screw shaft rotates in the same direction,
The nut is axially moved forward or backward along the screw shaft to move each upper rail along the lower rail of each seat rail, thereby driving the power seat in the front-rear direction.

[0003]

However, in such a configuration, as described above, the nut is non-rotatably supported on the upper rail via the bracket, while the screw shaft is connected to the motor via the worm gear and the worm wheel. , The nut or upper rail is moved forward and backward.
Therefore, as a matter of course, only a single motor for driving the worm gear is used as the driving source. Therefore, the moving speed of the nut, that is, the power seat, is controlled by the rotation speed of the single motor.
It is regulated to a certain value. In such a case, the rotation speed of the motor is usually set to a single speed, for example, an intermediate setting speed (rotation speed corresponding to 25 (mm / sec)), so that the moving speed of the power seat is also set to this speed. Fixed to the corresponding value. As a result, the moving speed of the power seat cannot be adjusted, and if the moving speed does not match the preference of the seated occupant of the power seat, there is a problem in that the seated occupant is uncomfortable.

[0004] In addition to the power seat apparatus having the above-described configuration, there is a configuration disclosed in Japanese Utility Model Publication No. 4-40984. However, in this configuration, the screw shaft is non-rotatably supported by the lower rail via each bracket, while a nut screwed to the screw shaft is rotatably supported in a holder fixed to the upper rail, The worm gear meshing with the worm wheel formed on the outer peripheral wall of the nut is rotated forward or backward by the motor, so that the upper rail moves in the front-rear direction. Therefore, such a configuration is disclosed in Japanese Patent Publication No. 4-701.
The configuration described in Japanese Patent Publication No. 72 is substantially different only in that the member driven by the motor is a nut, and thus causes the same problems as described above.

On the other hand, it is conceivable to employ a vehicle wiper control device for driving a power seat. In this case, in this wiper control device, a single wiper motor incorporates three brushes arranged out of phase with each other, and by switching energization to each brush, the rotational speed of the wiper motor is reduced. It is designed to switch between high and low two-stage speed. The wiper controller focuses on the fact that the rotational speed of the wiper motor and the total number of conductors of the armature winding are inversely proportional to each other. The number of rotations is increased by apparently decreasing the number. For this reason, the torque of the wiper motor, which changes in proportion to the total number of conductors, decreases with the apparent decrease in the total number of conductors. Naturally, even during this high-speed movement, the thrust is 100 as described above.
(Kgf) required, so 100 (kgf) at high speed
Motor with a large output torque. On the other hand, if the wiper motor is rotated at a low speed, the thrust of each upper rail greatly exceeds 100 (kgf) and increases unnecessarily, so that the strength of the mechanical components such as the seat rails is smaller than that in the above case. Must be much higher, so that
Further enlargement of the mechanical configuration of the seat rail and the like is inevitable.

Further, when a wiper motor is used as a motor for driving the power seat, there is a problem that the outer dimensions and weight of the motor are increased and the power consumption is greatly increased, as well as the motor. In this case, a method is conceivable in which a resistor is connected in series to the motor and power is lost by this resistor at low speed rotation. However, even with such a configuration, the same problem as described above occurs. Therefore, the present invention
In order to cope with the above, in a vehicle power seat device, a pair of small motors are effectively used to ensure a compact configuration, thorough and sufficient thrust, and prevention of unnecessary power consumption while ensuring the power seat. Increased travel speed range,
The purpose is to appropriately move the power seat at a speed according to the occupant's preference.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a lower rail and a lower rail are disposed on a floor of a vehicle in parallel with each other along a longitudinal direction of the lower rail. A pair of seat rails each having an assembling upper rail, a power seat mounted on each of the upper rails, and a one-way operation state operated when the power seat is moved in one direction or another direction. Or a driving means for driving the power seat in the one or other direction based on the one-way operating state or the other-direction operating state of the operating means. The feature is that it is configured as follows. That is, the configurational feature of the present invention is characterized in that the one-way operation state of the operation means is the first high-speed mode operation state and the first high-speed mode operation state when the power seat is driven in the one direction in the high-speed mode and the low-speed mode. And a second high-speed mode operation state and a low-speed mode operation when the power seat is driven in the other direction in the high-speed mode and the low-speed mode. A small motor with a fixed-side reduction gear fixed to one outer wall of both lower rails, wherein the driving means has a reduction gear output-side gear rotation shaft along the driving direction of the power seat. A traveling unit having a reduction gear output-side gear rotation shaft coaxially opposed to the reduction gear output-side gear rotation shaft and fixed to an outer wall of the one upper rail corresponding to the one lower rail; The small motor with a reduction gear and the small motor with both reduction gears are coaxially and integrally extended from one of the reduction gear output-side gear rotation shafts and relatively movable into the other reduction gear output-side gear rotation shaft. And a screw shaft to be screwed into
In the first or second low-speed mode operation state of the operation means, one of the small motors with both reduction gears is driven so as to move the power seat in the one direction or the other direction, and the operation means In the first or second high-speed mode operation state, the two small motors with reduction gears are so arranged that the lead of the screw shaft is apparently increased and the power seat is moved in the one direction or the other direction. To drive.

[0008]

According to the present invention, if the operating means is set to the first or second low-speed mode operating state, the driving means switches one of the small motors with both reduction gears to The power seat is driven to move in the one direction or the other direction. Therefore, the screw shaft moves in the one direction or the other direction at a relatively low speed with respect to the small motor with the traveling-side reduction gear, and moves the power seat in the same direction via the upper rails. Also,
If the operating means is set to the first or second high-speed mode operating state, the driving means moves the power seat in the one direction or the other direction so that the lead of the screw shaft is apparently increased. The small motor with both reduction gears is driven as described above. For this reason, the screw shaft moves at a relatively high speed in the one direction or the other direction with respect to the small motor with the traveling side reduction gear, and moves the power seat in the same direction via both upper rails.

[0009]

As described above, the small motors with both reduction gears are mounted on the lower rail and the upper rail of the seat rail, respectively, and the reduction gear output side gear shafts of the motors with both reduction gears are operated by the screw shafts. The operation to drive one of the small motors with both reduction gears or to drive these small motors with reduction gears so that the lead of the screw shaft is apparently increased. Means, and the moving speed range of the power seat is expanded as necessary, so that the thrust on the power seat is ensured within an appropriate value or less and the moving speed of the power seat is secured. Can be accurately and smoothly performed at a speed according to the occupant's preference, that is, at low speed or high speed. Further, as described above, since the thrust to the power seat can be suppressed within the above range, the power seat device of this type is provided in a compact external dimension without increasing the mechanical strength and weight. it can. Further, since the small motor with both reduction gears is employed as described above, the power consumption can be suppressed to a necessary minimum.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a vehicle power seat apparatus according to the present invention. This power seat device is provided with a pair of left and right seat rails RL, RR, and these seat rails RL, RR are arranged in parallel in the front-rear direction on the floor of the vehicle interior of the vehicle at intervals in the left-right direction. It is arranged. The two seat rails RL, RR are configured symmetrically to each other with respect to the longitudinal axis of the vehicle, and the power seat 10 is mounted on the two seat rails RL, RR. The left seat rail RL has a substantially U-shaped cross section.
A lower rail 20 having a U-shape is provided, and the lower rail 20 is fixed to the left side on the floor surface of the passenger compartment along the front-rear direction at a bottom wall thereof. Also, the left seat rail RL is
The upper rail 30 having a substantially inverted U-shaped cross section is provided.
The upper rail 30 is attached to the lower rail 20 so as to be movable in the front-rear direction so as to cover the lower rail 20 from above and outside.

On the other hand, the right seat rail RR has a substantially U-shaped section.
A lower rail 40 having a U-shape is provided, and the lower rail 40 is fixed to the right side on the floor surface of the vehicle interior along the front-rear direction at a bottom wall thereof. Also, the right seat rail RR is
The upper rail 50 having a substantially inverted U-shaped cross section is provided.
The upper rail 50 is mounted on the lower rail 40 so as to be movable in the front-rear direction so as to cover the lower rail 40 from above and outside. The seat portion 11 of the power seat 10
As shown in FIGS. 1 and 2, L-shaped brackets 32 and 33 and upper rails 50 fastened to the front and rear portions of the upper wall 31 of the upper rail 30 at the left and right edges, respectively.
L-shaped brackets 52 and 53 fastened to the front and rear portions of the upper wall 51 are received from below. FIG.
Reference numeral 12 indicates a seat back portion of the power seat 10.

The drive mechanism 60 is provided with a gear box 61 as shown in FIGS. 1 to 4, and the gear box 61 is provided with a bracket 52 in a casing 61a.
Are fastened to the lower surface of the extending portion 52a toward the bracket 32 side. This gear box 61 has a casing 61a.
Worm gear 61b and worm wheel 61c
(See FIG. 6).
b is engaged with the worm wheel 61c with its input shaft orthogonal to the rotation axis of the worm wheel 61c.
However, the input shaft of the worm gear 61b is the upper rail 5
The worm wheel 61c is located at a right angle to the left wall, while the rotation axis of the worm wheel 61c is located along the longitudinal direction of the upper rail 50 and parallel to the left wall.

The DC motor 62 is assembled to the casing 61a of the gear box 61 by its stator in coaxial connection with the input shaft of the worm gear 61b. Power is supplied to the DC motor 62 from the power supply terminal 62a. Made through. However, the reduction ratio of the gear box 61 is selected to a predetermined value in consideration of the moving speed of the power seat 10. Further, a small DC motor is used as the DC motor 62, and the relationship between the thrust and the moving speed of the upper rail 50 obtained under the operation of the DC motor 62 is represented by a straight line indicated by a broken line in FIG. Specified by L1.
In such a case, in the straight line L1, the moving speed 52
(Mm / sec), the thrust is zero, and when the moving speed is zero, the thrust is 50 (kgf) (see reference sign X in FIG. 8). Therefore, for example, the DC motor 6
When the load for No. 2 is the rated load, the moving speed is 32 (m
m / sec).

The rotation shaft of the worm wheel 61c of the gear box 61 is constituted by a longitudinal screw shaft 63 as shown in FIGS. 1 to 4, and the screw shaft 63 has a front end 63a. At the rear end 6 while being coaxially fitted to the worm wheel 61c.
At 3b, a bracket 54 fixed to the rear portion of the left wall of the upper rail 50 is rotatably supported via a receiving member 54a. On the outer peripheral surface of the screw shaft 63, a male screw portion is formed in the axial direction over a predetermined range so as to secure a moving range of the upper rail 50 in the front-rear direction. Thus, in the gearbox 61, the worm gear 61
b is the clockwise direction (see the arrow direction by the solid line shown in FIG. 6)
, The worm wheel 61c rotates forward (see the direction indicated by the solid line arrow in FIG. 6). On the other hand, when the worm gear 61b rotates counterclockwise (see the direction of the arrow indicated by the broken line in FIG. 6), the worm wheel 61c rotates in the reverse direction (see the direction of the arrow indicated by the broken line in FIG. 6).

The gear box 64 has a casing 64
a, the lower rail 40 is fastened to the front end of the lower surface of the bottom wall via the bracket 41.
Similarly to the gear box 61, the casing 64a has a worm gear 64b and a worm wheel 64c built therein (see FIG. 6). In the gearbox 64, the worm gear 64b is connected to the worm wheel 6
The input shaft of the worm gear 64b is perpendicular to the rotation axis of the worm wheel 4c, and the input shaft of the worm gear 64b is located at right angles to the left wall of the upper rail 50. On the other hand, the worm wheel 64 c is coaxially fitted to the screw shaft 63 at the rotation shaft hole, and a female screw portion formed on the inner peripheral surface of the rotation shaft hole of the gear box 64 is It is screwed to the male screw part so as to be relatively movable in the axial direction.

In the gear box 64,
When the worm gear 64b rotates clockwise (see the direction of the arrow indicated by the solid line in FIG. 6), the worm wheel 64b rotates.
c reverses (see the direction of the arrow indicated by the solid line in FIG. 6). This means that the worm wheel 64c advances the screw shaft 63 by the reverse rotation (see the direction of the arrow indicated by the solid line in FIG. 6). On the other hand, when the worm gear 64b rotates in the counterclockwise direction (see the arrow direction indicated by the broken line in FIG. 6), the worm wheel 64c rotates forward (see the arrow direction indicated by the broken line in FIG. 6). This means that the worm wheel 64c causes the screw shaft 63 to move backward (see the arrow direction indicated by the broken line in FIG. 6) by its forward rotation. However, gearbox 64
Is set to the same value as that of the gear box 62.

The DC motor 65 is assembled to the casing 64a of the gear box 64 by its stator in coaxial connection with the input shaft of the worm gear 64b. Power is supplied to the DC motor 65 through the power supply terminal 65a. Made through. However, as the DC motor 65, a small DC motor similar to a conventional power seat motor (40 W to 50 W) is employed, and the thrust and moving speed of the upper rail 50 obtained by the operation of the DC motor 65 are obtained. Is specified by a straight line L2 indicated by a solid line in FIG. In such a case, the movement speed 2
When the speed is 0 (mm / sec), the thrust is zero, and when the moving speed is zero, the thrust is 100 (kgf). Therefore, for example, when the load on the DC motor 65 is the rated load, the moving speed is 16 (mm / sec). In FIG. 2, reference numeral 34 denotes the left lower rail 20.
2 shows a bracket fixed to the front part of the lower surface of the right wall of FIG.

Next, an electric circuit configuration of the present invention will be described with reference to FIGS. The operation switch mechanism 70 is mounted at an appropriate position in the passenger compartment of the vehicle. The operation switch mechanism 70 switches between two sets of fixed contacts 71 to 73 and 74 to 76 and switches between the fixed contacts 71 to 76. And a switching contact 77 which is grounded. As shown in FIG. 7, one set of fixed contacts 71 to 73 is arranged symmetrically with respect to the other set of fixed contacts 74 to 76 with respect to the switching contact 77, Numerals 72 are arranged so as to be connected in series and selectively switched on by a switching contact 77. The fixed contact 73 is a fixed contact 7
2 and a switching contact 77 is arranged so as to be switched on. On the other hand, both fixed contacts 74 and 75
Are arranged so as to be connected in series and selectively switched on by a switching contact 77. The fixed contact 76 is arranged so as to be turned on by the switching contact 77 together with the fixed contact 75.

The drive circuit E has a relay composed of a relay coil 80a and a switching relay switch 80b, and a relay composed of a relay coil 90a and a normally open relay switch 90b. The relay coil 80a is connected to a DC power supply (13. 5 (V)) and the operation switch mechanism 70
Is connected between the fixed contact 71 and the fixed contact 71. The relay coil 80a is connected to the switching contact 7 of the operation switch mechanism 70.
Only when the fixed contact 7 is turned on to one of the fixed contacts 71 and 72, the power is supplied from the DC power supply and excited.
The change-over relay switch 80b includes a pair of fixed contacts 8
1, 82 and a switching contact 83. The switching contact 83 is applied to the fixed contact 81 in a demagnetized state of the relay coil 80a.
It is supplied to the fixed contact 82 by the excitation of 0a. The fixed contact 81 is grounded, while the fixed contact 82 is connected to the positive terminal of the DC power supply (13.5 (V)).

The relay coil 90a has one end connected to the positive terminal of the DC power supply (13.5 (V)). The other end of the relay coil 90a has a backflow preventing diode D1. Connected to the fixed contact 71 of the operation switch mechanism 70 via the
And is connected to the fixed contact 74 via. Thus, the switching contact 77 of the operation switch mechanism 70 is
1 and 72 or only one of the two fixed contacts 74 and 75, the relay coil 90a
Are supplied with power from the DC power supply and are excited. The normally open relay switch 90b closes when the relay coil 90a is excited.

The driving circuit E includes a relay coil 100
a and a switching relay switch 100b, a relay coil 110a and a normally open relay switch 1
10b, and a relay coil 1
Reference numeral 00a is connected between the positive terminal of the DC power supply (13.5 (V)) and the fixed contact 74 of the operation switch mechanism 70. The relay coil 100a is energized by being supplied with power from the DC power supply only when the switching contact 77 of the operation switch mechanism 70 is in a state of being closed to one of the fixed contacts 74 and 75. Switching relay switch 10
0b is constituted by a pair of fixed contacts 101 and 102 and a switching contact 103, and the switching contact 103
Are the fixed contacts 10 in the demagnetized state of the relay coil 100a.
1 and, on the other hand, are applied to the fixed contact 102 by excitation of the relay coil 100a. Note that the fixed contact 101
Is grounded, while the fixed contact 102 is connected to the DC power source (1).
3.5 (V)). One end of the relay coil 110a is connected to the positive terminal of the DC power supply (13.5 (V)), and the other end of the relay coil 110a is connected to both fixed contacts 73 of the operation switch mechanism 70. , 76 are connected. Thus, the switching contact 77 of the operation switch mechanism 70 is
3, 76, the relay coil 110a
Is supplied with power from the DC power supply and is excited. The normally open relay switch 110b closes when the relay coil 110a is excited.

The switching relay switches 80b and 100b and the normally open relay switches 90
The connection relationship between the DC motors 62 and 65 will be described. One end of the DC motor 65 includes a switching contact 83, a relay switch 110b, and a DC motor 62.
And is connected to the other end of the DC motor 65 via the. Also,
The other end of the DC motor 65 is connected to a switching contact 103 via a relay switch 90b. Thus, the DC motor 65 is supplied with power from the DC power supply (13.5 (V)) via the fixed contact 82 and the switching contact 83, and rotates clockwise (corresponding to the reverse rotation of the worm wheel 64c, ie, the forward movement of the screw shaft 63). On the other hand, power is supplied from the DC power source via the fixed contact 102, the switching contact 103, and the relay switch 90b, and the motor rotates counterclockwise (corresponding to the forward rotation of the worm wheel 64c, that is, the backward movement of the screw shaft 63). The DC motor 62 is supplied with power from the DC power supply (13.5 (V)) via a fixed contact 82, a switching contact 83, and a relay switch 110b, and is rotated clockwise (forward rotation of the screw shaft 63, that is, a power seat). 10). On the other hand, power is supplied from the DC power source via the fixed contact 102, the switching contact 103, and the relay switch 90b to rotate counterclockwise (reverse rotation of the screw shaft 63, that is, reverse of the power seat 10). Corresponding). Note that, in FIG.
Reference numeral 6 denotes a surge voltage absorbing diode.

The moving mode of the power seat 10 in the embodiment constructed as described above will be described. (1). The switching contact 77 of the operation switch mechanism 70 is fixed to the fixed contact 7
1, the relay coil 80a is connected to the diode D3
And the switching contact 83 of the switching relay switch 80b is turned on to the fixed contact 82 by being excited by the power supply from the DC power source under the backflow preventing action. At the same time, the relay coil 90a is excited by the power supply from the DC power supply under the forward biasing action of the diode D1, and closes the relay switch 90b. Therefore, the DC motor 65
Are rotated clockwise by being supplied from the DC power supply.

Then, the worm gear 64b of the speed reducer 64
Is rotated clockwise (see FIG. 6), and the worm wheel 64 is rotated.
c reverses. Accordingly, the screw shaft 63 pushes the upper rail 50 of the seat rail RR in the forward direction via the speed reducer 61 and the two brackets 52 and 54 as the screw shaft 63 advances. Therefore, the two seat rails RL, RR advance their respective upper rails 30, 50 along the respective lower rails 20, 40 to move the power seat 10 in the same direction. In such a case, since the rotation of the DC motor 62 remains stopped, the forward moving speed of the power seat 10 is maintained at a low speed determined by the rotation speed according to the load of the DC motor 65 and the reduction ratio of the speed reducer 64. The low speed value and the thrust corresponding thereto are determined by a straight line L2 (see FIG. 8) according to the load on the DC motor 65. In this state, when the power seat 10 reaches the occupant's desired forward position, the switching contact 77 of the operation switch mechanism 70 is switched.
Is released from the fixed contact 71, the relay coil 8
0a changes the switching contact 83 to the fixed contact 82 due to the demagnetization.
To the fixed contact 81 and the relay coil 90
“a” opens the relay switch 90b by the demagnetization. Therefore, the rotation of the DC motor 65 and the forward movement of the screw shaft 63 and the upper rails 30 and 50 stop, and the low-speed forward mode of the power seat 10 ends.

(2). In such a state, when the switching contact 77 of the operation switch mechanism 70 is turned on to the fixed contact 74 in such a state, the relay coil 90a is turned on by the DC power supply 13 under the forward bias action of the diode D2. .5 (V) to close the relay switch 90b, and at the same time, the relay coil 100a is excited by the power supply from the DC power supply to turn the switching contact 103 of the relay switch 100b into the fixed contact 102. . Therefore, the DC motor 65 is supplied with power from the DC power supply and rotates counterclockwise.

Then, the worm gear 64b of the speed reducer 64
Rotates counterclockwise (see FIG. 6), and the worm wheel 6
4c is reversed, whereby the screw shaft 63 pulls the upper rail 50 of the seat rail RR in the reverse direction via the speed reducer 61 and both brackets 52 and 54 due to the backward movement. Therefore, the two seat rails RL, RR move their respective upper rails 30, 50 backward along the respective lower rails 20, 40 to move the power seat 10 in the same direction. In such a case, the low value of the backward moving speed of the power seat 10 and the low value and the thrust for the low value are the same as described above. In such a state, when the power seat 10 reaches the desired reverse position of the occupant, the operation switch mechanism 70
Release of the switching contact 77 into the fixed contact 74, the relay coil 90a returns the relay switch 90b to the open state by degaussing, and the relay coil 1
00a turns on the switching contact 103 from the fixed contact 102 to the fixed contact 101 due to the demagnetization. Therefore, the rotation of the DC motor 65 and the backward movement of the screw shaft 63 and the upper rails 30 and 50 stop, and the low-speed backward mode of the power seat 10 ends.

(3). High-speed forward mode of the power seat 10 The switching contact 77 of the operation switch mechanism 70 is applied to both the fixed contacts 72 and 73. Then, the DC motor 65 rotates clockwise as in the case of the low-speed forward mode described above. At the same time, the relay coil 110a is supplied with power from the DC
Close. Therefore, the DC motor 62 rotates clockwise by being supplied with power from the DC power supply.

When the two DC motors 65 and 62 rotate clockwise in this way, the worm wheel 64c of the speed reducer 64
With the reverse rotation (see FIG. 6) and the forward rotation of the worm wheel 61c of the speed reducer 61 (see FIG. 6), the screw shaft 63 moves forward and the seat rails RL and RR move their upper rails 30 and 50. By moving forward at high speed, the power seat 10 is moved in the same direction. In such a case, since the rotation directions of the worm wheel 64c and the worm wheel 61c are opposite to each other, the lead of the screw shaft 63 is apparently increased. Accordingly, if the rotation speeds of the worm wheels 64c and 61c are N1 and N2, respectively, and the lead of the screw shaft 63 is L, the moving speed of the upper rails 30 and 50 is V = (N1 + N2) L.
Specified by. This moving speed is represented by both straight lines L in FIG.
8 is specified by a broken line L3 formed by the algebraic sum of 1 and L2. In the folding line L3, when the thrust is 50 (kgf) or less, the thrust is given by the sum of the two straight lines L1 and L2.
In the range of 0 (kgf) or less, it is given only by the straight line L2. Accordingly, the moving speed is 48 (mm / sec) with respect to the thrust at the time of the rated load on both DC motors 65 and 62.
c).

For this reason, when both the DC motors 65 and 62 are rotating clockwise, the forward moving speed of the power seat 10 is less than 50 (kgf).
At the load of 5, the corresponding high-speed value determined by V = (N1 + N2) L is maintained. The high-speed value and the thrust corresponding thereto are determined by the broken line L3 (see FIG. 8) according to the load on the DC motor 65. In addition, 50 (k
The thrust in the range of gf) to 100 (kgf) is the same as in the forward low-speed mode. In such a state, when the power seat 10 reaches the occupant's desired forward position, the fixed contacts 72, 7 of the switching contact 77 of the operation switch mechanism 70.
3 is released, the relay coil 80a switches the switching contact 83 from the fixed contact 82 to the fixed contact 81 by demagnetizing the relay coil 80a.
a indicates that each relay switch 90b, 110b
Open. Therefore, the rotation of both the DC motors 65 and 62 and the forward rotation of the screw shaft 63 stop, and the high-speed forward mode of the power seat 10 ends.

(4). High-speed reverse mode of the power seat 10 After the above-described high-speed forward mode ends, the switching contact 77 of the operation switch mechanism 70 is turned on to both fixed contacts 75 and 76. Then, as in the case of the low-speed reverse mode described above, the DC motor 62 rotates counterclockwise. At the same time, as in the high-speed forward mode, the relay coil 110a closes the relay switch 110b by the excitation, and rotates the DC motor 62 counterclockwise. When both the DC motors 65 and 62 rotate counterclockwise in this manner, the screw shaft is driven by the forward rotation of the worm wheel 64c of the speed reducer 64 (see FIG. 6) and the reverse rotation of the worm wheel 61c of the speed reducer 61 (see FIG. 6). 63 reversely reverses and both seat rails R
L and RR move the upper rails 30 and 50 backward at high speed to move the power seat 10 in the same direction.
In such a case, the moving speed of both upper rails 30 and 50 becomes V = (N1 + N2) L due to an apparent increase in the lead of the screw shaft 63, as in the above-described forward high-speed mode.
Is identified by the broken line L3 in FIG.

Therefore, when both the DC motors 65 and 62 are rotating in the counterclockwise direction, the reverse movement speed of the power seat 10 is less than 50 (kgf).
At the load of 5, the corresponding high-speed value determined by V = (N1 + N2) L is maintained. The high-speed value and the thrust corresponding thereto are determined by the broken line L3 (see FIG. 8) according to the load on the DC motor 65. In addition, 50 (k
The thrust in the range from gf) to 100 (kgf) is the same as in the reverse low speed mode. In this state, when the power seat 10 reaches the occupant's desired reverse position, the fixed contacts 75, 7 of the switching contact 77 of the operation switch mechanism 70 are provided.
6 is released, the relay coil 100a closes the switching contact 103 from the fixed contact 102 to the fixed contact 101 due to the demagnetization of the relay coil 100a.
a and 110a are demagnetized so that each relay switch 90
b, 110b are opened. Therefore, the rotation of both the DC motors 65 and 62 and the reverse reversal of the screw shaft 63 stop, and the high-speed reverse mode of the power seat 10 ends.

As described above, in this embodiment, the DC motor 65 and the speed reducer 64 are mounted on the lower rail 40, while the DC motor 62 and the speed reducer 61 are mounted on the upper rail 50, and the worm wheel of the speed reducer 61 is mounted on the lower rail 40. A worm wheel of a speed reducer 64 was screwed to the screw shaft 63 supported so as to be relatively movable. When the power seat 10 is moved forward or backward at a low speed under the drive of the drive circuit E accompanying the operation of the operation switch mechanism 70, the rotation of the DC motor 62 and the speed reducer 61 is stopped. By moving the worm wheel of the speed reducer 64 in reverse or forward with the operation of the DC motor 65 to move the screw shaft 63 forward or backward, the power seat 10 is moved forward or backward at a low speed. On the other hand, when the power seat 10 is moved forward or backward at a high speed, the reduction gear 61 associated with the operation of the DC motor 62 is operated under the reverse or forward rotation of the worm wheel of the reduction gear 64 associated with the operation of the DC motor 65. The worm wheel is rotated forward or backward to cause the screw shaft 63 to apparently increase its lead so as to rotate forward or reverse, thereby moving the power seat 10 forward or backward at high speed. As a result, the operating speed range of the power seat 10 is expanded by operating the operation switch mechanism 70, and the power seat 10 is moved at a speed according to the passenger's preference, that is, at a low speed or a high speed.
Can be moved accurately and smoothly. In other words, in connection with the operation of the operation switch mechanism 70, the two DC motors 6
The basic function for securing the moving speed of the power seat 10 is secured by the DC motor 65 among the second and 65, and the auxiliary function for securing the moving speed of the power seat 10 is secured by the DC motor 62. As a result, the moving speed range of the power seat 10 is expanded, so that in the state where the occupant is seated on the power seat 10 (rated state), the two direct current motors can be used to achieve high and low second speeds, and The power seat 10 can be moved accurately and smoothly at a speed according to the preference, that is, at a low speed or a high speed.

In such a case, as described above, both small DC motors 65 and 62 are employed, and
By utilizing the cooperative operation of the two reduction gears 61 and 64 and the screw shaft 63 provided by the gears 5 and 62, the power seat 10 can be moved in the front-rear direction. Therefore, when the seated occupant protrudes his or her feet, the same maximum thrust of 100 (kgf) is obtained regardless of the height and the thrust on the power seat 10 is 100 (k).
gf) The movement adjustment of the power seat 10 can be smoothly performed at a high-low switching speed while ensuring no excess or shortage in the following range. Further, the thrust on the power seat 10 is set to 100
(Kgf) or less, so that this type of power seat device can be provided with a compact external size without increasing the mechanical strength and weight. Also,
Since the small DC motors 65 and 62 are employed, power consumption can be suppressed to a necessary minimum. In addition, the screw shaft 63
Is meshed at one end with a worm gear 61b via a worm wheel 61c, and is meshed at the other end with a worm wheel 64c, so that the screw shaft 63 is connected to the worm gear 61b and the worm. The wheel 64c is structurally separated from the wheel 64c. For this reason, even if an unreasonable load such as distorting the screw shaft 63 occurs, the load is absorbed by the structurally separated configuration as described above, so that the screw shaft 63 is not distorted, The original mechanism can be properly exhibited.

In the above embodiment, the speed reducer 64
And the DC motor 65 are attached to the lower rail 40, while the speed reducer 61 and the DC motor 62 are connected to the upper rail 5.
Although an example in which the speed reducer 64 and the DC motor 65 are mounted on the upper rail 50 is described instead, the speed reducer 61 and the DC motor 62 are mounted on the lower rail 40 instead. Even in this case, the same operation and effect as the above embodiment can be achieved. Also,
In the above-described embodiment, an example has been described in which the drive mechanism 60 is provided on the right seat rail RR. Alternatively, the drive mechanism 60 may be provided on the left seat rail RL. Rail RR, RL
The driving mechanism 60 may be applied to both of them.

Further, in the above embodiment, the DC motors 62 and 65 are mounted on the upper rail 30 and the lower rail 20 via the speed reducers 61 and 64, respectively. , 64 may be mounted on the upper rail 30 and the lower rail 20 via the DC motors 62, 65, respectively. Further, in practicing the present invention, the operation states of the two DC motors 62 and 65 in the above embodiment may be interchanged. In such a case, the type of each motor is
The present invention is not limited to the DC motors 62 and 65, but may be modified as appropriate. Further, in the above-described embodiment, the example in which the power seat 10 is moved in the front-rear direction of the vehicle has been described. Alternatively, for example, when the power seat 10 is moved in the left-right direction like a wagon vehicle, the power seat 10 may be moved. You may apply and implement this invention.

In practicing the present invention, the mounting position of the driving mechanism 60 on the seat rail RL is not limited to the right side thereof, but may be mounted on the left side of the seat rail RL as long as space is allowed. May be. In implementing the present invention, each reduction gear 6
The speed reduction ratios of 1 and 64 do not have to match each other. Further, the gear configuration of each of the speed reducers 61 and 64 may be appropriately changed and implemented as necessary, such as a combination of a pair of bevel gears. Further, in the above-described embodiment, the intersection between the straight line L1 and the horizontal axis in FIG. 8 is described as 50 (kgf) (see the symbol X in FIG. 8). However, the present invention is not limited to this. The present invention may be implemented with appropriate changes. In addition, although the example in which the intersection between the straight line L2 and the horizontal axis in FIG. 8 is set to 100 (kgf) has been described, the intersection is not limited to this, and the intersection may be appropriately changed according to the specifications of the power seat 10 and implemented. Is also good. In implementing the present invention, the configuration of the operating mechanism 70 is not limited to the configuration described in the above embodiment, and may be appropriately changed and implemented. The present invention is not limited to the configuration described in the example. For example, a semiconductor switching element or the like may be employed instead of the relay, and the embodiment may be implemented to ensure substantially the same function as the drive circuit E.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of a right seat rail and a driving mechanism of FIG. 2;

FIG. 4 is a left side view of the same.

5 is a rear view of the drive mechanism as viewed from an arrow A shown in FIG. 4 of the drive mechanism.

FIG. 6 is a configuration diagram showing a relationship between both reduction gears of a drive mechanism and a screw shaft.

FIG. 7 is an electric circuit configuration diagram for driving a driving mechanism.

FIG. 8 is a graph showing a relationship between a thrust on a power seat and a moving speed thereof.

[Explanation of symbols]

RL, RR: seat rail, 10: power seat, 20, 40: lower rail, 30, 50:
Upper rail, 60 ... drive mechanism, 61, 64 ...
・ Reducers, 62, 65: DC motor, 63: Screw shaft, 70: Switch mechanism, 80a to 110
a ... relay coil, 80b, 100b ... switching relay switch, 90b ... relay switch.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60N 2/06

Claims (1)

(57) [Claims] 1. A pair of seat rails respectively provided on a floor surface of a vehicle in parallel with a space therebetween, and each of which has a lower rail and an upper rail movably mounted on the lower rail along the longitudinal direction thereof. And a power seat mounted on each of the upper rails; operating means that is operated when the power seat is moved in one direction or another direction to be in a one-way operation state or another direction operation state; A power seat device comprising: a driving unit that drives the power seat in the one direction or the other direction based on the one-way operation state or the other-direction operation state. A first high-speed mode operation state and a low-speed mode operation state when driving in the one direction in the high-speed mode and the low-speed mode; The other direction operation state of the operation means includes a second high speed mode operation state and a low speed mode operation state when the power seat is driven in the other direction in the high speed mode and the low speed mode. Means, having a reduction gear output side gear rotation shaft along the driving direction of the power seat, a small motor with a fixed side reduction gear fixed to one outer wall of the both lower rails, and the reduction gear output side gear rotation shaft A small motor with a traveling-side reduction gear fixed to an outer wall of the one upper rail corresponding to the one lower rail, and a small-size motor with both the reduction gears. A screw shaft extending coaxially and integrally from one of the reduction gear output-side gear rotation shafts of the motor and screwed relatively movably into the other reduction gear output-side gear rotation shaft; In one of the first and second low-speed mode operation states, one of the small motors with both reduction gears is driven so as to move the power seat in the one direction or the other direction. Or driving the small motors with both reducers in the second high-speed mode operation state so that the lead of the screw shaft is apparently increased and the power seat is moved in the one direction or the other direction. Power seat device characterized by the above-mentioned.