JPH0671951U - Power type drive mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of motors in the power seat. [Structure] A pair of meshing surfaces 14 are provided on the surfaces of the nut 14 and the clutch member 22, which cannot rotate with respect to the lead screw 12, facing each other.
b and 22b are formed respectively. Then, the engagement hole 24,
The nut 14 is locked under the engagement between the engaging pieces 26a, and when the nut is unlocked, the meshing surface of the clutch member
An arm 26 that meshes between 14b and 22b to rotate the nut integrally with the lead screw 12 is swing-controlled by a solenoid 30.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power type drive mechanism which moves a target movable member in a corresponding direction under the operation associated with driving of a motor.

[0002]

[Prior art]

 For example, so-called power seats, whose seat position and seating posture can be adjusted under the control of motor drive, are widely provided as front seats for passenger cars.

The power seat is formed, for example, with a seating posture control device such as a seat slide device, a seat lifter, and a recliner device. The tilt angle of the seat itself (tilt angle) and the tilt angle of the seat back (reclining angle) can be adjusted individually.

[0004]

[Problems to be solved by the device]

 However, since the seating posture control device mounted on the power seat as described above is generally configured to include a motor as a drive source individually, normally, a motor corresponding to the number of seating posture control devices is provided. , Are located throughout the power seat. Therefore, in the known configuration, the total number of motors in the power seat is likely to increase, which may increase the overall weight of the power seat, complicate the configuration, and increase the cost. This is not preferable.

In particular, since the seat slide device and the seat lifter both use the movable member as the seat itself, they are usually arranged at adjacent positions below the seat cushion. Therefore, securing a space for disposing the drive mechanism, the motor, and the like under the seat may lead to deterioration of cushioning property of the seat and increase in size of the entire seat.

An object of the present invention is to provide a power type drive mechanism capable of reducing the number of motors in a power seat.

[0007]

[Means for Solving the Problems]

 According to the present invention, in order to achieve this object, the lead screw is formed in a non-circular detent shape with a non-circular cross section, and a clutch member having a meshing surface on one side has a corresponding detent shape. Is not rotatable with respect to the lead screw and is movable in the axial direction. Further, the nut is formed into a substantially columnar shape having a meshing surface corresponding to the meshing surface of the clutch member on the opposite surface and a plurality of engaging holes on the outer peripheral surface, and is rotatably attached to the case body. There is.

An arm whose swing is restricted with respect to the case main body by the restricting means is formed with an engaging piece that engages with an engaging hole of a nut, and a clutch member is pivotally attached to the arm. The nut is held by the lead screw by being pivotally supported and unlocking the nut when the arm swings and engaging the engagement surfaces of the nut and the clutch member.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a power-type drive mechanism 10 according to the present invention includes a lead screw 12 that rotates in conjunction with the drive of a motor (not shown) and a nut that is screwed to the lead screw. And 14 are formed. A DC geared motor is usually used as the motor.

The lead screw 12 is connected to an output shaft (not shown) of the motor, and is generally erected and rotatably supported between a pair of fixing members (not shown).

As can be seen from FIG. 3 in addition to FIG. 1, the nut 14 has, for example, a cylindrical shape, and a threaded portion 14 a to be screwed with the lead screw 12 is formed in the center of the axis line in advance. . As shown in FIGS. 1 to 3, the nut 14 is rotatably attached to a case main body 18 which is a base portion of the drive mechanism 10 via a bearing, for example, a pair of thrust ball bearings 16.

As shown in FIGS. 1 and 2, the case main body 18 is usually fixed to a bracket 20 and is attached to a movable member of the seating posture control device, for example, a seat in a seat sliding device, via the bracket. It is connected. In other words, the case body 18 is supported so as to prevent the rotation of the lead screw 12 integrally, and is movable in the axial direction of the lead screw along with the movable member of the seating posture control device. There is.

Here, as shown in FIGS. 2 and 3, in the present invention, the lead screw 12 has, for example, a non-rotating shape with a non-circular cross section having a partial notch 12a along the axial direction. A clutch member 22 that is formed and has a through-hole 22a having a rotation-stop shape corresponding to the lead screw is attached at a position adjacent to the nut 14 so as to be movable in the axial direction of the lead screw and integrally rotatable. There is.

As can be seen from FIG. 1, the opposing surfaces of the nut 14 and the clutch member 22 are formed as, for example, a pair of meshing surfaces 14b and 22b having corresponding irregularities that can mesh with each other. Has been done. In such a configuration, the engagement and disengagement between the engagement surfaces 14b and 22b can be switched by moving the clutch member 22 with respect to the nut 14 along the axis of the lead screw 12.

As can be seen from FIGS. 1 to 3, a plurality of engaging holes 24 are formed in advance on the outer peripheral surface of the nut 14, and engaging pieces that can be inserted into and engaged with the engaging holes are provided. An arm 26 having 26a is pivotally attached to, for example, a support shaft 29 of the bracket 20 so as to be swingable with respect to the case body.

Then, the clutch member 22 is pivotally attached to and pivotally supported on the arm 26 by, for example, a support ring 27 having a support pin 27 a and a mounting member 28, and the swinging of the arm about the support shaft 29 is performed. Along with the movement of the lead screw 12 along the axis, the engagement and disengagement between the nut and the engagement surfaces 14b and 22b of the clutch member are switched.

As the mounting member 28, a C-ring that can be fitted in the fitting groove 22b of the clutch member can be usually used. In such a configuration, the C ring (mounting member) 28 is fitted into the fitting groove 22c of the clutch member, so that the support ring 27 is sandwiched between the flange 22d of the clutch member 22 and Detachment is prevented.

The swinging of the arm 26, that is, the engagement between the engagement surfaces 14b and 22b of the nut and the clutch member, and the release of the engagement are performed by the restricting means 30. As the regulating means 30, for example, an electromagnetic solenoid that can switch expansion / contraction of the movable shaft 30b with respect to the main body 30a by supplying or shutting off an electric current can be used. The solenoid (regulating means) 30 is usually attached to the bracket 20 outside the case body 18.

Note that the configuration of the solenoid (regulating means) 30 is known, and the configuration of the solenoid itself is not the purpose of this invention, so it will not be described in detail.

As shown in FIG. 3, in such a configuration, when the solenoid 30 is extended, the nut 14 is rotated with respect to the case body 18 under the engagement between the engagement hole 24 and the engagement piece 26a. The lock is disabled, and the connection between the nut and the meshing surfaces 14b and 22b of the clutch member is released.

In such a locked state of the nut 14, when the lead screw 12 rotates under the driving of the motor, the case main body 18 moves the lead screw 12 against the lead screw as the nut 14 is screwed and retracted with respect to the lead screw. Move along the axis. Then, under the movement of the case body 18, the corresponding movable member of the seating posture control device moves, and the position of the movable member is adjusted.

Further, as shown in FIG. 4, when the solenoid 30 is contracted, the nut 14 is unlocked when the engagement piece 26a is disengaged from the engagement hole 24 due to the swing of the arm 26. In addition, the movement of the clutch member 22 in the nut direction along the axis of the lead screw 12 causes the engagement surfaces 14b and 22b to engage with each other so that the nut and the clutch member are integrally rotatable.

In such a state, the lock of the nut 14 is released, and the clutch member 22 that rotates integrally with the lead screw 12 is connected to the nut under the engagement between the engagement surfaces 14b and 22b. Therefore, the nut rotates together with the clutch member together with the lead screw. In other words, when the nut 14 is unlocked, the nut does not advance or retract with respect to the lead screw 12.Therefore, the movable member does not move with the case body 18, and the nut with respect to the lead screw, that is, the case body does not move. Position is retained.

Therefore, in the unlocked state of the nut 14, the movement of the movable member of the seating posture control device is prevented regardless of the driving of the motor. In other words, even if one lead screw 12 is provided with a plurality of nuts 14, that is, the drive mechanism 10, only one drive mechanism can be arbitrarily selected and moved, so that a plurality of lead screws can be used. The number of motors can be reduced by sharing the same drive mechanism.

In particular, in the seat slide device and the seat lifter, if the lead screw 12, that is, the motor is shared, the installation space of the motor and the like below the seat can be partially reduced, so that the installation space can be reduced. It comes off. Therefore, it is possible to prevent an increase in the installation space of the drive mechanism of each device and the like below the seat, and to ensure sufficient cushioning of the seat.

In the present invention, the nut is locked and unlocked under the movement of the clutch member 22 with respect to the nut 14 and the swing of the arm 26. That is, since the nut 14 does not move in the axial direction of the lead screw except for the screw advancement and the screw retraction with respect to the lead screw 12, the load resistance in the axial direction is large.

Therefore, the present invention can be sufficiently used for a seating posture control device such as a seat slide device and a seat lifter that exerts a large load, and the range of use can be expanded.

Further, a solenoid 30 serving as a regulation means of the arm 26 is located outside the case body 18. Therefore, the case body 18 does not increase in size, and the overall size of the drive mechanism 10 can be sufficiently suppressed. From this point also, the overall size of the seat is prevented from increasing.

It should be noted that although the power seat drive mechanism 10 of the present invention can be effectively used as a configuration in which the motors of the seat slide device and the seat lifter are shared, the present invention is not limited to this, and other seating posture control is possible. Needless to say, it can also be used as a drive mechanism of a device.

Here, in the embodiment, the lead screw 12 is formed in a non-circular cross-section having the notch 12a along the axial direction, but the rotation preventing rotation of the clutch member with respect to the lead screw is prevented. The shape is not limited to the illustrated shape, as long as it has a stop shape.

Further, the restricting means 30 is exemplified as an electromagnetic solenoid, but through the arm 26, the engagement between the nut and the engagement surfaces 14b and 22b of the clutch member, the engagement release, and the engagement hole of the nut are performed. 24, it suffices to switch between engagement and disengagement between the engagement pieces 26a of the arm, that is, lock and unlock of the nut 14. Therefore, the restricting means 30 is not limited to a solenoid, and may be configured to swing the arm 14 between predetermined positions by, for example, a small motor or the like.

However, if an electromagnetic solenoid is used as the restricting means 30, the nut 14 can be locked and unlocked smoothly and reliably by the switching control of the current supply to the solenoid and the interruption, so that the configuration is complicated. Can be sufficiently prevented.

Although the embodiment is embodied as a drive mechanism for a power seat of a passenger car or the like, a power seat is sufficient as the drive mechanism, and the invention is not limited to this. For example, a train, an airplane, a ship, etc. The drive mechanism of the present invention may be applied to a sheet or a sheet for bean jam, hairdressing and the like.

The above-described embodiments are for explaining the present invention, and do not limit the present invention in any way, and all the modifications and alterations made within the technical scope of the present invention are also applicable. It goes without saying that it is included in the invention.

[0036]

[Effect of device]

 As described above, according to the power type drive mechanism according to the present invention, even if a plurality of drive mechanisms are provided in one lead screw, movement of each drive mechanism can be restricted. The number of motors can be reduced by sharing with. Therefore, it is possible to reliably prevent an increase in the overall weight of the seat, a complicated structure, and an increase in cost.

In particular, if the power type drive mechanism of the present invention is used as the drive mechanism for the seat slide device and the seat lifter, the installation space for the motor and the like under the seat can be partially reduced. Can be reduced. Therefore, it is possible to prevent an increase in the installation space of the drive mechanism of each device and the like below the seat, and to ensure sufficient cushioning of the seat.

Since the nut moves in the axial direction of the lead screw only by screwing the screw forward and backward with respect to the lead screw, the load resistance in the axial direction is large. Therefore, it can be fully used for a seating posture control device such as a seat slide device, a seat lifter, and the like, where a large load acts, and the range of use is expanded.

Further, if an electromagnetic solenoid is used as the regulation means, the nut can be locked and unlocked smoothly and reliably by controlling the switching of supply and interruption of current to the solenoid, so that the structure is sufficiently complicated. Can be prevented.

Further, by disposing the solenoid serving as the arm regulating means outside the case body, the case body does not become large, and the overall size of the drive mechanism can be sufficiently suppressed. From the point of view, it is possible to prevent the overall size of the seat from increasing.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a power type drive mechanism according to the present invention when a nut is locked.

FIG. 2 is a schematic perspective view of a power type drive mechanism.

FIG. 3 is a schematic exploded perspective view of a power type drive mechanism.

FIG. 4 is a schematic cross-sectional view of a power type drive mechanism similar to FIG. 1 when the nut is unlocked.

[Explanation of symbols]

 10 Power type drive mechanism 12 Lead screw 14 Nut 14b Engagement surface 18 Case body 22 Clutch member 22b Engagement surface 24 Engagement hole 26 Arm 30 Control means (solenoid)

Claims (3)

[Scope of utility model registration request] 1. A lead screw that rotates in association with driving of a motor; and a nut that is screwed into the lead screw and that moves in the axial direction of the lead screw under screwing and screwing with respect to the rotation of the lead screw. In a power type drive mechanism for moving a target movable member in a corresponding direction under the operation of driving a motor, the lead screw is formed in a non-circular cross-section detent shape, and , A clutch member having a meshing surface on one side is provided so as to be non-rotatable and axially movable with respect to the lead screw under a corresponding detent shape, and a nut meshes with the meshing surface of the clutch member. It is formed into a substantially cylindrical shape having a plurality of engaging holes on its outer peripheral surface and a surface on the opposite surface, and is rotatably attached to the case body, and An arm for engaging and disengaging the nut with respect to the case body under the engagement hole, engagement between the engagement pieces, and engagement release. , Swingably provided with respect to the case main body, the clutch member is pivotally attached to and pivotally supported by the arm, and the swinging of the arm is regulated by the regulating means, and the nut is locked with the swing of the arm, and ,nut,
By releasing the meshing between the meshing surfaces of the clutch member, the nut can be screwed in and out with the rotation of the lead screw, and by unlocking the nut and meshing between the meshing surfaces, the nut can be integrated with the lead screw. A power type drive mechanism characterized by being able to rotate to prevent movement of the nut in the axial direction. 2. The regulating means is an electromagnetic solenoid that controls expansion and contraction of the movable shaft with respect to the main body under the switching of supply and interruption of electric current. The free end of the movable shaft of the solenoid is provided with one end of the arm. Under the rocking motion of the nut as the movable shaft expands and contracts, the engagement holes of the nut, the engagement between the engagement pieces of the arm, the disengagement, and the engagement between the engagement surfaces of the nut and the clutch member. 2. The power type drive mechanism according to claim 1, wherein disengagement can be switched almost integrally. 3. The power type drive mechanism according to claim 2, wherein the solenoid serving as the regulation means is arranged outside the case body in which the nut is housed.