JP2589275Y2 - Nut member structure in multi-drive device for vehicle electrical components - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut member structure in a multi-drive device for electric components for vehicles such as private cars, buses and trucks.

[0002]

2. Description of the Related Art
In this type of vehicle, for example, like a seat (seat), each operating part can be selectively adjusted according to the physique of the occupant, such as forward and backward movement, up and down movement of a backrest part, vertical movement of a seat part, and the like. There is something like that. In this case, in the case where each of the operating sections is operated by using an independent electric motor, there is a problem that the number of parts increases and the size of the seat itself increases.

[0003] Therefore, it has been attempted to use a single electric motor to selectively perform a plurality of these operations by ON / OFF operations of corresponding switches. Therefore, power from the electric motor is received. The operating screw shaft that rotates forward and reverse
It has already been proposed that a nut member connected to the operating portion is screwed and the nut member is relatively moved with respect to the operating screw shaft so that the alternative operating portion is operated. . In addition, this is provided with a nut body screwed to an operating screw shaft in a casing accommodating a nut member, a plunger externally fitted to the nut body so as to be axially movable and integrally rotated in a direction around the axis, and A return spring that moves the plunger to the other side in the axial direction, an excitation coil that is fitted to the outside of the plunger and forcibly moves the plunger to one side in the axial direction against the return elastic, and a direction around the axis of the operating screw shaft. And a second engagement receiving member to which the plunger moved to the other side in the axial direction is engaged, and is integrally provided in one side of the nut body in a direction around the axis with respect to the operating screw shaft. A first engagement receiving body that rotates but is movably fitted in the axial direction, and is engaged with the plunger that has moved to one side in the axial direction, is provided opposite to the plunger,
A clutch means comprising a yoke plate integrated with a casing to relatively move the plunger by an attraction action of the plunger which has become an exciting iron core with excitation of the exciting coil. When the exciting coil is in the non-excited state and the plunger is moved to the other side in the axial direction and is engaged with the second engagement receiver,
The nut body, the plunger, and the second engagement receiving body on the casing side are integrated, whereby the nut member is relatively moved with respect to the rotating operation screw shaft to operate the operation section. .

[0004] In the nut member configured as described above, when the exciting coil is excited, the plunger serves as an exciting iron core and relatively attracts the yoke plate, whereby the plunger becomes the first engagement receiving member. , And the nut member stops moving relative to the operating screw shaft. In this case, the plunger which moves to engage the first engagement receiver with the excitation of the exciting coil is a yoke. It was configured to move until it abuts (collides) with the plate. However, both the plunger and the yoke plate need to be formed of a ferromagnetic metal material such as iron, and therefore, there is a problem that a collision noise between the metals is generated when the plunger and the yoke plate come into contact with each other. As a means for reducing the generation of the collision sound, it is proposed to provide a washer made of a resin material at the collision portion. However, in this case, the number of parts is increased because the resin washer is required. Rather, the noise is generated when the resin washer is severely pinched between the plunger and the yoke plate, so that further improvement in quietness is desired.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to provide a nut member structure in a multi-drive apparatus for vehicular electrical components which can eliminate these disadvantages. A nut member screwed on an operation screw shaft that rotates forward and reverse in response to the power from the electric motor and relatively moves along with the forward and reverse rotation of the operation screw shaft, thereby operating the operation portion. In a multi-drive device for vehicular electrical components configured to perform the above, a nut body screwed to an operating screw shaft and a movable body in the axial direction with respect to the nut body are provided in a casing accommodating the nut member. A plunger externally fitted to the nut body so as to rotate integrally with the nut in a direction around the axis, a return spring for urging the plunger to move to the other side in the axial direction, and an outer fitting slidably on the outer periphery of the plunger. An exciting coil, A second engagement receiving body, which is integrally supported by the casing, is restricted from rotating integrally with the operating screw shaft in the axial direction, and is engaged with the plunger moved to the other side in the axial direction; The plunger is provided so as to face the side and rotates integrally with the operating screw shaft in the direction around the axis, but freely fits in the axial direction and engages with the plunger that has moved to one side in the axial direction. And a yoke plate opposed to the plunger so as to relatively move the plunger to one side in the axial direction by an attraction action of the plunger which has become an exciting iron core when the exciting coil is excited. And a plunger is provided between the first engagement receiver of the clutch means and the plunger in the first engagement receiver engaging stage before the plunger abuts the yoke plate. Relative to the side It is characterized in that the regulating portion for regulating the movement is provided.

According to the present invention, the clutch operation can be performed more quietly with this configuration.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a seat mounted on a vehicle such as a passenger car, and an electric drive device 2 according to the present invention is provided below the seat 1 to move the seat 1 forward and backward, and to seat the seat. The height of the front part and the rear part can be selectively adjusted, and these three types of operations can be performed in the embodiment.

That is, the electric drive unit 2 is provided integrally below the seat 1, but the electric drive unit 2
The reduction gear mechanisms 5 and 6 provided at the left and right ends of the output shaft 4 projecting in the left-right direction from the electric motor 3 are integrally fixed to the lower surface of the seat 1. 7, 8 is the first,
The second operating screw shafts, the operating screw shafts 7, 8, each have an axial line extending in the front-rear direction, and a locking portion extending in the axial direction on the outer periphery (in this embodiment, one-chamfered). However, it may be a two-sided chamfer, or may be a groove or the like.) 7a and 8a are formed. The operating screw shafts 7 and 8 rotate around the axis in connection with the drive of the electric motor 3, and the rear ends of these shafts are turned to support members 1 a projecting from the rear end of the lower surface of the seat 1. It is movably supported, and the shaft front ends are connected to the reduction gear mechanisms 5 and 6, and are transmitted to the first and second operating screw shafts 7 and 8 in a state where the driving of the electric motor 3 is reduced. It is configured as follows. Further, first nut members 9 and 10 are respectively screwed to the operation screw shafts 7 and 8 at a position intermediate between the operation screw shafts 7 and 8. The lower surfaces of 9, 10
It is provided integrally with a support 2a integral with the floor surface, and is set so as to relatively move back and forth with respect to the operation screw shafts 7, 8 based on the rotation of the operation screw shafts 7, 8. And, as will be described later, a clutch body (corresponding to the plunger of the present invention)
When the second shift position 20 is set, the seat 1 moves back and forth by relative movement of the first nut members 9 and 10 with respect to the operating screw shafts 7 and 8 based on the rotation of the operating screw shafts 7 and 8. Is set to

On the other hand, the position of the first operating screw shaft 7 on the front side of the first nut member 9 and the position of the second operating screw shaft 8 on the rear side of the first nut member 10 are located at the second position. The nut members 12 and 13 are screwed with each other, and when the clutch body 20 is at the second shift position as described later, the second nut members 12 and 13 are rotated based on the rotation of the operation screw shafts 7 and 8. It is adapted to move back and forth relative to the operating screw shafts 7 and 8. These second nut members 12 and 13 are connected to height adjusting mechanisms 16 and 17 disposed in front and rear of the seat 1 via connecting rods 14 and 15, respectively. The height is adjusted individually.

The first nut members 9 and 10 and the second nut members 12 and 13 provided on the first and second operating screw shafts 7 and 8, respectively, have the following configuration. Although the relative movement with respect to the operating screw shafts 7 and 8 is set so as to be selectively intermittently switched, each of the nut members 9, 10, 12 and 13 includes an electromagnetic clutch having the same configuration. Therefore, for convenience, the configuration of the electromagnetic clutch of the first nut member 9 will be described below.

That is, the nut member 9 is housed in a casing 18 having a through-hole 18a penetrating the operating screw shaft 7 so as to be freely movable on the operating screw shaft 7. The casing 18 has a box shape whose upper part is open. A cylindrical rotating body (corresponding to the first engagement receiving body of the present invention) 19 formed of a resin material is slidably provided on one side of the casing 18.
The rotating body 19 has an inner cylindrical surface engaged with a locking portion 7 a formed on the operation screw shaft 7, and the rotation of the operation screw shaft 7 about the axis is integrally rotated with the operation screw shaft 7. Although it moves, the operation screw shaft 7 is set so as to be free from the operation screw shaft 7 for axial movement by penetrating loosely.
Further, on the outer periphery of the other side of the rotating body 19, as described later,
A first clutch receiving portion 19a is formed of an engaging groove (spline groove) which is removably engaged with a first clutch engaging portion 20a formed on the clutch body 20. Incidentally, a nut body 21 is adjacent to the other side of the rotating body 19 with a gap therebetween. The nut body 21 is screwed into the operating screw shaft 7 in a penetrating manner. A plurality of engagement grooves 2 oriented in a direction
1a is engraved.

The clutch body 20 is formed of a steel material and functions as a plunger for an electromagnetic clutch. The clutch body 20 has a cylindrical shape, the other half has a small-diameter inner cylindrical shape, and the inner cylindrical surface has the nut-shaped member. An engagement receiving groove 20b is formed so as to engage integrally with the mating groove 21a in the direction around the axis but to allow the axial movement.
Further, one half portion of the clutch body 20 forms a large-diameter inner cylindrical portion 20c and loosely fits the rotating body 19, and when the clutch body 20 moves to one side as described later, the clutch body 20 is closed. One end of the body engagement receiving groove 20b is set so as to be removably engaged with the first clutch receiving portion 19a formed on the rotating body 19, and thus the clutch body engaging receiving groove is provided. The one end side of 20b is configured to be the first clutch engaging portion 20a.

On the other hand, a clutch receiving body (corresponding to the second engagement receiving body of the present invention) 22 is provided on the other side of the casing 18, and the clutch receiving body 22 is provided in a cylindrical portion. And a square plate-like flange portion 22a is formed integrally with the flange portion 22a. The clutch receiving body 22 is formed with a large-diameter inner cylinder part on one side in which the clutch body 20 is fitted, and a small-diameter inner cylinder on the other side in which the nut body 21 is loosely fitted. A second clutch receiving portion 22b removably engaged with a second clutch engaging portion 20d formed on the other side surface of the clutch body 20 is provided on a step surface between the large-diameter inner cylinder portion and the small-diameter inner cylinder portion. Are formed. Then, as described later, the clutch body 20 moves to the other side and the second clutch engaging portion 20d engages with the second clutch receiving portion 22b, so that the clutch body 20 rotates around the axis with respect to the casing 18. Direction, so that the clutch body 20
The rotation of the operation screw shaft 7 around the axis is regulated, but the relative movement in the axial direction is provided freely.

Reference numeral 23 denotes a coil bobbin integrally incorporated in the casing 18, and the coil bobbin 23
Is provided so that the outer periphery of the clutch body 20 is slidably fitted to the outside of the clutch body 20, and is provided so that the rotation around the axis with respect to the casing 18 is regulated. The exciting coil 24 is wound. Meanwhile, 2
Reference numeral 5 denotes a yoke plate which is made of a steel material and is located on one side of the casing 18 and slidably fits on the outer periphery of the rotating body 19. The yoke plate 25 has the other side face 25 a of the clutch body 20. It is arranged opposite to the side end surface 20e. Further, the other side of the yoke plate 25 and the clutch body 2
Between the step portion 20f formed in the inner cylindrical portion of the zero
A clutch ammunition 26 for returning the clutch body 20 to the other side is interposed. Then, when the excitation coil 24 is energized, the clutch body 20 serves as an excitation iron core, so that the yoke plate 25 is relatively attracted.

By the way, as described above, the exciting coil 24
The clutch body 20 moves to the yoke plate 25 side due to the excitation, and the first clutch engaging portion 20a engages with the first clutch receiving portion 19a, but the clutch body 20 moves to the yoke plate 25 side. Is regulated before the clutch body 20 collides with the yoke plate 25, and the collision is regulated as follows. That is, the movement amount A of the clutch body 20 due to the excitation of the exciting coil 24 is smaller than that of the clutch body 2 at the time of non-excitation.
0 and the other side 2 of the yoke plate 25
It is sufficient that the distance B is less than the distance B (A <B). Therefore, in the present embodiment, before the one side end surface 20e of the clutch body 20 comes into contact with the other side surface portion 25a of the yoke plate 25, One side end 20g of the first clutch engaging portion 20a is in contact with the groove inner end 19b of the first clutch receiving portion 19a formed on the outer peripheral surface on the other side of the rotating body 19, and the yoke of the clutch body 20 is further increased. The movement to the plate 25 side is restricted, so that the clutch body 20
A restricting portion for restricting the contact of the first member with the yoke plate 25 is configured.

On the other hand, the clutch body 20 is
Is in the non-excited state, it returns to the other side by receiving the urging force of the clutch ammunition 26. In this state, the first clutch engaging portion 20a on one side is separated from the first clutch receiving portion 19a (engagement). The second clutch engagement portion 20d on the other side is located at the second shift position where it is engaged (engaged) with the second clutch receiving portion 22b. On the other hand, when the exciting coil 24 is excited by a switch operation (not shown),
The clutch body 20 is attracted by the yoke plate 25 to one side against the urging force of the clutch ammunition 26 and moves.
The first clutch engaging portion 20a on one side is engaged with the first clutch receiving portion 19a, while the second clutch engaging portion 20d on the other side is engaged.
Is set to be at the first shift position apart from the second clutch receiving portion 22b, and thus the clutch operating means is constituted. When the operating screw shaft 7 rotates in the first shift position state, the clutch body 20 rotates integrally with the rotating body 19, but is freely connected to the clutch receiving body 22, and the clutch body 20, Rotating body 1
9. The nut body 21 rotates together with the operating screw shaft 7 (co-rotation).
Then, the clutch 1 is in the clutch continuous state in which the sheet 1 does not move and does not move. On the other hand, when the operating screw shaft 7 rotates in the second shift position state, the clutch body 20
Although it is free from the rotating body 19, the rotation is regulated integrally with the clutch receiving body 22, whereby the clutch 1 is configured to be in a clutch disconnected state in which the sheet 1 moves.

In the embodiment of the present invention configured as described above, when adjusting the front-back position of the seat 1 or the front-back height of the seat 1, for example, when adjusting the front-side height of the seat 1, The energizing of the exciting coil 24 provided on the third nut member 12 is cut off to move the clutch body 20 to the rotating body 1.
9 can be freely moved to engage with the clutch receiving member 22, whereby the corotation of the clutch body 20 with the operating screw shaft 7 is restricted, and the electric motor 3 is rotated. The front height of the seat 1 is adjusted following the rotation of the operation screw shaft 7 accompanying the forward / reverse drive, and when the front / rear position is adjusted, the first and second nut members 9 and 10 are moved. The other nut members 12, 13 may be brought into a non-moving state.

As described above, in the embodiment in which the present invention is implemented, the front-back position adjustment and the height adjustment of the seat 1 are automatically performed by the electric driving force. It can be performed by selectively switching the corresponding clutch operating means on and off, so that the drive control of the plurality of adjusting mechanisms can be performed by driving from one electric motor. There is no need to provide a dedicated electric motor for the adjustment mechanism. As a result, these adjustment parts of the seat 1 are largely used, so that the number of parts can be reduced, the weight and size of the apparatus can be reduced, and the apparatus can be greatly contributed to simplification. Cost reduction can also be achieved.

Further, in this device, when the exciting coil 24 is excited by the switch operation and the clutch body 20 becomes the exciting iron core and the yoke plate 25 is attracted, the clutch body 20 is moved to the first clutch engaging portion 20a. In the state of being engaged with the first clutch receiving member 19a, the first clutch receiving portion one side end 2 is inserted into the first clutch receiving portion groove deep end 19b.
Relative movement is performed until 0g abuts, and further movement is restricted, so that the one end surface 20e on one side of the clutch body separates with a slight gap S without abutting against the other side surface portion 25a of the yoke plate. Moreover, the collision caused by the stoppage of the movement of the clutch body 20 is received by the rotating body 19 formed of a resin material, so that the collision noise is reduced. The sound pressure spectra of the collision sound of the present embodiment and those of the embodiment in which the collision sound was reduced by using a resin washer were measured. The measurement results shown in FIGS. 6 and 7 were obtained. Was. According to this, the sound pressure level (dB) at each frequency is higher in the embodiment in which the present invention is implemented.
Is clearly observed, and the overall sound pressure level (overall sound pressure level) of the resin washer is 77.7 dB.
(A), the result of the embodiment of the present invention is 72.6 dB (A), which confirms that the collision sound is clearly reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and as in the second embodiment shown in FIG.
A step surface portion 19c for regulating the movement of the clutch body 20 as a plunger may be formed on the outer peripheral surface of the rotating body 19 as the first clutch receiving body. In this manner, the movement of the clutch body 20 is achieved. As the regulating ability increases, the groove inner end 19b of the first clutch receiving portion 19a can be protected.

[0021]

In summary, since the present invention is constructed as described above, a plurality of movement adjustments such as adjustment of the front and rear position of the seat can be performed by changing the clutch body and the rotating body in the nut members provided correspondingly. It is only necessary to switch between the engagement with the clutch receiver and the engagement with the clutch receiver. As a result, a plurality of multi-position adjustments can be performed from one electric motor. Therefore, the number of parts can be reduced and the weight and size can be effectively reduced.

In addition, in this device, when the yoke plate of the plunger is attracted by the excitation of the exciting coil, one side of the plunger is engaged with the first engagement receiving member. In the receiving member engaging stage, the plunger is moved by the restricting portion provided between the plunger and the first engaging receiving member so that further relative movement toward the yoke plate is restricted. Since the side end portion does not contact the other side surface portion of the yoke plate, the collision due to the stoppage of the movement of the plunger is received by the first clutch receiving body formed of the resin material, thereby reducing the collision noise. I do.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a sheet.

FIG. 2 is a schematic explanatory view showing an electric seat moving device.

FIG. 3 is a longitudinal sectional view showing a state where a nut member is in a second shift position.

FIG. 4 is a longitudinal sectional view showing a state where the nut member is in a first shift position.

FIG. 5 is an enlarged view of a main part.

FIG. 6 is a sound pressure spectrum diagram during a clutch operation of the first embodiment.

FIG. 7 is a sound pressure spectrum diagram during a conventional clutch operation.

FIG. 8 is an enlarged view of a main part of the second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet 3 electric motor 7 first operating screw shaft 9 first nut member 12 second nut member 19 rotating body 19a first clutch receiving portion 19b groove deep end 20 clutch body 20a first clutch engaging portion 20d second clutch engaging Part 20e One side end face 21 Nut body 22 Clutch receiving body 22b Second clutch receiving part 23 Coil bobbin 24 Exciting coil 25 Yoke plate 25a Other side surface 26 Clutch ammunition

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-110536 (JP, A) JP-A-56-135326 (JP, A) JP-A-5-63964 (JP, U) JP-A-60-135 89044 (JP, U) Hira 3-85227 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60N 2/00-2/54

Claims (1)

(57) [Scope of request for utility model registration] A nut member screwed on an operating screw shaft that rotates forward and backward by receiving power from an electric motor relatively moves with the forward and reverse rotation of the operating screw shaft, thereby operating the operating portion. In a multi-drive device for vehicular electrical components configured to perform the above, a nut body screwed to an operating screw shaft and a movable body in the axial direction with respect to the nut body are provided in a casing accommodating the nut member. A plunger externally fitted to the nut body so as to rotate integrally with the nut in a direction around the axis, a return spring for urging the plunger to move to the other side in the axial direction, and an outer fitting slidably on the outer periphery of the plunger. An exciting coil, and a second engagement receiving body integrally supported by the casing, the integral rotation of the operating screw shaft in the direction around the axis being restricted, and the plunger moving to the other side in the axial direction engaging with the casing. Is installed in a state facing one side of the nut A first engagement receiving body that is integrally rotatable in the direction around the axis with respect to the driving screw shaft, but is freely movably fitted in the axial direction, and is engaged with the plunger moved to one side in the axial direction; A clutch means comprising a yoke plate opposed to the plunger so as to relatively move the plunger to one side in the axial direction by an attraction action of the plunger which has become an exciting core with the excitation of the exciting coil, is provided.
In addition, between the first engagement receiver of the clutch means and the plunger, a restriction for restricting the relative movement toward the yoke plate in the first engagement receiver engagement stage before the plunger abuts the yoke plate. A nut member structure in a multi-drive device of a vehicular electrical component, wherein the nut portion is provided.