JPH0749143Y2 - Actuator sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a sealing device for a motor drive actuator used for a door lock device, a trunk lid opener, etc. of an automobile.

[Prior Art] Conventionally, such an actuator transmits the rotation of a motor housed in a housing to a screw bolt, and moves a nut member having a screwing portion with the screw bolt forward and backward in the axial direction of the screw bolt with respect to the housing. It is possible. Then, one end of this nut member is connected to an operating rod connected to an operation lever of a door lock device or the like, and a motor is rotated in response to a control signal to lock or unlock the door lock device. The actuator arranged in the door of such a vehicle needs a waterproof measure to protect it from rainwater that intrudes into the door, and therefore, conventionally, a substantially square shape is formed around the entire mating surface of the divided housing. The endless packing is mounted and the specially shaped boot is provided on the sliding part with the nut member.

[Problems to be Solved by the Invention] However, in such a conventional actuator seal device, a substantially rectangular endless packing is mounted on the entire circumference of the mating surface of the housing, and the sliding portion with the nut member has a special shape. Since the boots are installed, the outer shape of the housing must be designed to match the optimum shape of the endless packing, which limits the freedom of design, and as a result makes it difficult to reduce the size. There was a problem of becoming.
In addition, the seal structure near the sliding portion becomes complicated, which causes a cost increase.

An object of the present invention is to solve the conventional problems described above, and to provide an actuator seal device that can reduce the cost of the packing shape by a simple structure including the sliding portion without depriving the housing design freedom. To provide.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a screw bolt rotated by a motor housed in a housing, a screwing portion of the screw bolt, and an axis line of the screw bolt. And a nut member having an opposing wall parallel to the motor, wherein the nut member is movable in the axial direction with respect to the housing in accordance with rotation of the motor. A housing, the housing is divided into two parts including the protruding part, and a packing mounting recess is formed on at least one side of the housing on the side where the protruding part is provided. The projecting recess is formed in a step shape along the axis line, and a ridge corresponding to the recess is formed on the other of the split mating surfaces. And mounting the linear packing in the recess while exposing it to the outer peripheral side in the projecting portion, and further mounting one end to the nut member and the other end inscribed in the packing to the projecting portion. The boot member is provided.

[Operation] According to the present invention, the linear packing is mounted in the recess formed on at least one of the split mating surfaces of the housing on the side including the protruding portion while exposing the outer peripheral side of the protruding portion.

Then, the housing is assembled by bringing a ridge formed on the other of the split mating surfaces into contact with the packing, and the other end of the boot member having one end attached to the nut member is inscribed in the packing while the other end is inscribed. Be attached to.

Therefore, the housing mating surface including the projecting portion is sealed by the contact between the linear packing and the ridge, and the projecting portion which is the sliding portion of the nut member is sealed by the boot member, so that the intrusion of water into the housing. Is completely prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 5 show one embodiment of the present invention. In the figure, 10 is a resin housing and a lower housing
The upper housing 10B and the upper housing 10B are divided into two parts.

Reference numeral 11 denotes a motor housed and fixed in the lower housing 10A, and a screw screw made of resin through a centrifugal clutch 12.
Rotate 13 As shown in FIG. 2, the centrifugal clutch 12 has a magnet 11D penetrated in a radial hole 11C formed in a boss member 11B fixed to an output shaft 11A of a motor 11.
On the other hand, a protrusion 13B is provided on the inner peripheral surface of the cylindrical base portion 13A of the screw bolt 13. In addition,
The tip of the output shaft 11A of the motor 11 is fitted into a fitting hole 13C formed at the center of the screw bolt 13 axis, and supports one end of the screw bolt 13.

14 is a screwing portion 1 that is screwed with the screw portion 13D of the screw bolt 13.
A resin nut member having 4A and an opposing wall portion 14B integrally extending from the screwing portion 14A and including an opposing wall surface parallel to the axis of the screw bolt 13, and is located further distally than the opposing wall portion 14B. Has a disc-shaped flange portion 14C and a locking piece portion 14E provided with a hole 14D for locking an unillustrated actuating rod or the like.

Further, on the upper surface of the screwed portion 14A, a conductive contact plate 14F and
14G are provided, which come into contact with the wiring board 10C attached to the inner surface of the upper housing 10B and perform a predetermined switch operation as the nut member 14 moves.

Reference numeral 15 is a resin bearing member, which has a body portion 15A and leg portions 15B. The leg portion 15B is rotatably supported around bearing shafts 10D and 10E provided in the lower and upper housings 10A and 10B in a direction parallel to the facing wall surface and orthogonal to the axis of the screw bolt 13. It The body portion 15A is provided with a fitting hole 15C into which the tip portion of the screw bolt 13 is fitted, and the side facing the facing wall surface is formed as an arc surface 15D.

The end surfaces of the lower and upper housings 10A and 10B along which the nut member 14 is slidably guided are shown in FIGS.
As shown in the figure, semi-annular protrusions 10F and 10G, respectively
Are provided, and semi-annular projections 10H and 10I are provided on the outer peripheral surfaces of the protrusions 10F and 10G, respectively.

In addition, a protrusion is provided on the split mating surface 10J of the lower housing 10A.
Recessed portion 10K for mounting the linear packing 16 including 10F
Are formed. However, it should be noted that the concave portion 10K on the split mating surface has a groove shape, whereas the protruding portion 10F has a step shape in which the outer wall of the groove is missing. A protrusion 10L is formed on the division mating surface (not shown) of the upper housing 10B at a position facing the above-mentioned recess 10K.

In this embodiment, the linear packing 16 is made of rubber having a circular cross section. Further, 17 is a boot member having a rubber bellows, one end of which is a nut member 14
The disk-shaped flange portion 14C is engaged and mounted, and the other end is engaged with the annular protrusions 10H and 10I and mounted on the protruding portions 10F and 10G. At this time, the inner peripheral surface of the boot member 17 is the outer peripheral surface of the annular protrusions 10F and 10G and the linear packing.
Close to 16.

After assembling the actuator of the present embodiment having the above-mentioned configuration, after mounting the linear packing 16 cut to an appropriate length in the recess 10K of the lower housing 10A in which the motor 11, the screw bolt 13 and the nut member 14 are mounted. The ridges 10L of the upper housing 10B are brought into contact with the linear packing 16 and the mating surfaces are butted, and the upper and lower housings 10A and 10B are joined by screws or the like.

Then, as described above, both ends of the boot member 17 may be attached by engaging with the annular flange portion 14C and the annular protrusions 10H and 10I of the nut member 14, respectively. As a result, not only the mating surfaces of the upper and lower housings, but also the projections 10F and 1F that constitute the sliding guides of the end surface of the housing 10 and the nut member 14
Even in the continuous part with 0G, the linear packing 16 and the boot member
Since the inner peripheral surface of 17 is brought into close contact with the inner peripheral surface, the sealing is completely performed.

In this state, when the motor 11 rotates, the centrifugal force causes the magnet 11D to project from the radial direction 11C and engage with the protrusion 13B, thereby connecting the centrifugal clutch 12 and screw bolt.
13 rotates. Then, as the screw bolt 13 rotates, the nut member 14 moves in the axial direction, and the housing 10
Projected or retracted from. As a result, an operating rod (not shown) can be driven to cause the door lock device, the trunk lid opener, or the like to perform a predetermined operation.

At this time, the tip of the screw bolt 13 is the bearing member.
Since it is fitted and supported in the fitting holes 15C of 15, the support is surely performed.

Further, even if the screw bolt 13 whirls due to the flexibility or the like of the screw bolt 13 formed of resin, the bearing member 15 rotates about the rotation axis of the leg 15B. No twisting occurs in the fitting portion between the tip portion and the fitting hole 15C, and the braking force does not act on the rotation of the screw bolt 13. Therefore, the load on the motor 11 is reduced. Further, even when the bearing member 15 is rotated, since the side facing the facing wall surface of the body portion 15A is formed as an arc surface 15D, it is kept in a non-contact state with the nut member 14 and slides on the nut member 14. Does not give resistance.

Thus, the nut member 14 operates smoothly without being affected by the bearing member 15, and the load on the motor 11 is also reduced.

In the present embodiment, an example in which the linear packing is partially attached to the protrusions 10F, 10G side of the housing mating surface is shown, but this is the protrusion 10F, 10G side when the actuator is mounted in the door or the like. This is because it is usually taken to face upwards, and of course when using it for other purposes, the linear packing is also continuously attached to the mating surface on the opposite side of the protrusions 10F, 10G, It goes without saying that the sealing can be performed regardless of the mounting direction of the actuator.

[Effects of the Invention] As is apparent from the above description, according to the present invention, a protrusion is provided at a penetrating portion of the nut member in the housing, and the housing is formed into two parts including the protrusion. , At least on the side where the protrusion is provided,
A packing mounting recess is formed on one of the split mating surfaces of the housing, the packing mounting recess is formed in a step shape along the axis at the projecting portion, and a protrusion corresponding to the recess is formed on the other split mating surface. And a linear packing is attached to the recess while exposing the outer periphery of the protrusion, and one end is attached to the nut member and the other end is inscribed in the protrusion on the packing. Since the boot member that is installed while being installed is provided, the housing shape can be designed without being affected by the shape of the packing, and the need for a packing length that matches the recess length is eliminated, and the packing length can be reduced. It is possible to simplify management and obtain a low-priced actuator seal device.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention with an upper housing removed, FIG. 2 is a sectional view taken along the line AA of FIG. 1 including the upper housing, and FIG. 3 is a housing according to an embodiment of the present invention. FIG. 4 is a perspective view showing the vicinity of the protruding portion, FIG. 4 is a sectional view taken along the line BB of FIG. 2, and FIG. 5 is a sectional view taken along the line CC of FIG. 10 …… Housing, 10A …… Lower housing, 10B …… Upper housing, 10H, 10I …… Projection, 10K …… Recess, 10L
...... Ridge, 11 …… Motor, 13 …… Screw bolt, 14
...... Nut member, 15 …… Seal member, 16 …… Packing,
17 …… Boots member.

Claims (1)

[Scope of utility model registration request] 1. A motor comprising a screw bolt that is rotated by a motor housed in a housing, and a nut member that has a threaded portion that engages with the screw bolt and a facing wall that is parallel to the axis of the screw bolt. An actuator capable of moving the nut member in the axial direction with respect to the housing in accordance with rotation of the housing, a protrusion is provided at a penetrating portion of the nut member in the housing, and the housing is divided into two parts including the protrusion. Forming a packing mounting recess on one of the split mating surfaces of the housing at least on the side where the projection is provided, and forming the packing mounting recess in a step shape along the axis in the projection. At the same time, a ridge corresponding to the recess is formed on the other of the split mating surfaces, and a linear packing is attached to the protrusion on the recess. And a boot member that is mounted while being exposed to the outer peripheral side, and further has one end mounted on the nut member and the other end mounted on the protrusion while being inscribed in the packing. apparatus.