KR102520848B1 - Vehicle trunk drive actuator - Google Patents

Abstract

The present invention relates to a drive actuator for a vehicle trunk, which opens and closes the vehicle trunk, comprising: a drive motor; a rotational shaft having a first worm gear formed in a first direction in a first area and a second worm gear formed in a second direction opposite to the first direction in a second area, and rotationally driven by the driving motor; a first worm wheel engaged with the first worm gear; a first transmission gear that rotates integrally with the first worm wheel; a second worm wheel engaged with the second worm gear; a second transmission gear that rotates integrally with the second worm wheel; an output gear that rotates while being simultaneously engaged with the first transmission gear and the second transmission gear; an output shaft that rotates in conjunction with the rotation of the output gear; a driving holder fixed to the output shaft, rotating together with the output shaft, and connected to a connection bracket connected to a trunk hood for a vehicle; It is configured to include, not only can open and close the trunk hood electrically, but also allows the user to manually open and close the trunk hood while suppressing noise and vibration generation and providing a driving actuator for a vehicle trunk with a compact and lightweight structure. .

Description

Drive actuator of vehicle trunk {VEHICLE TRUNK DRIVE ACTUATOR}

The present invention relates to a drive actuator for a trunk for a vehicle, and more particularly, not only can the trunk be opened and closed by the operation of a drive motor, but also allows the trunk to be opened and closed by manual manipulation, and has a small volume and low weight, It relates to a trunk actuator for vehicles with low operating noise and vibration.

In general, a trunk space for loading luggage is provided in a vehicle.

For a long time, trunk hoods have been widely used to open and close the trunk hood by means of a latch structure, but recently, a structure in which a trunk hood is opened and closed by a switching operation using an electric motor has been applied to enhance user convenience.

However, even when the trunk is opened and closed using an electric motor, it is necessary for the user to manually open and close the trunk smoothly. To this end, Korean Patent Laid-open Publication No. 10-2012-0020697 discloses a trunk drive actuator having a structure in which power is transmitted only by a spur gear in order to manually open and close the trunk.

However, since the actuator for power transmission by the spur gear has a large volume and weight, it occupies a lot of space for installation in a vehicle and causes a problem in fuel efficiency due to the increase in weight. In addition to this, since the meshing noise between the spur gears is relatively greater than that of the worm helical gears, the user has to endure inconvenience due to operating noise and vibration.

Accordingly, there is a growing need for a vehicle trunk actuator that allows opening and closing of the trunk by manual as well as electric manipulation, occupies a small volume and weight, and has low operation noise and vibration.

Republic of Korea Patent Publication No. 10-2012-0020697

In order to solve the above conventional problems, the present invention provides a driving actuator for a vehicle trunk that can open and close the trunk by electric power of a drive motor and allows a user to open and close the trunk hood by pushing or pulling it. aims to do

In addition, an object of the present invention is to minimize operating noise and vibration generated during an opening and closing operation by a driving motor and a manual opening and closing operation.

Another object of the present invention is to reduce the volume and weight of the actuator.

In addition, an object of the present invention is to implement a simple and compact structure while more accurately arranging an installation position of a hall sensor for detecting a rotation angle of a drive motor.

The present invention has been derived to achieve the above object, an actuator for opening and closing a trunk for a vehicle, comprising: a driving motor; a rotational shaft having a first worm gear formed in a first direction in a first area and a second worm gear formed in a second direction opposite to the first direction in a second area, and rotationally driven by the drive motor; a first worm wheel engaged with the first worm gear; a first transmission gear that rotates integrally with the first worm wheel; a second worm wheel engaged with the second worm gear; a second transmission gear that rotates integrally with the second worm wheel; an output gear that rotates while being simultaneously engaged with the first transmission gear and the second transmission gear; an output shaft that rotates in conjunction with the rotation of the output gear; a driving holder fixed to the output shaft, rotating together with the output shaft, and connected to a connection bracket connected to a trunk hood for a vehicle; It provides a drive actuator for a vehicle trunk, characterized in that configured to include.

According to the present invention, an advantageous effect of allowing a user to manually close or open the trunk hood arbitrarily without damaging parts is obtained while opening and closing the trunk hood by using the electric rotational torque of the motor driving the vehicle trunk.

According to the present invention, as the rotational torque of the driving motor is transmitted to the trunk hood through the worm gear and the worm wheel, a compact structure with a small volume is realized, and at the same time, the trunk hood is pushed or pulled by adjusting the lead angle of the worm wheel. By allowing force to be received by the worm gear and the worm wheel, an advantageous effect of enabling torque transmission in a compact structure without damaging parts can be obtained.

According to the present invention, a first worm gear in a first direction and a second worm gear in an opposite direction are formed on a rotation shaft driven by a drive motor, respectively, and two worm wheels meshing with them are formed, driving By sharing the burden of torque transmission from the motor to the trunk hood, it is possible to prevent excessive stress between the worm gear and the worm wheel from being concentrated, and to form the worm wheel with a lightweight plastic material to obtain an advantageous effect of contributing to weight reduction.

According to the present invention, the rotation shaft on which the worm gear is formed is installed to be axially movable with respect to the bearing supporting rotation, and at the same time, the frictional resistance between the worm wheel and the worm gear is reduced by forming a play in the axial direction of the rotation shaft in advance. , Manual rotation driving force is transmitted from the trunk hood to the worm gear in a low-friction state, and the worm wheel rotates the worm gear, thereby obtaining an advantageous effect of enabling manual and automatic opening and closing of the trunk in a low-noise state.

According to the present invention, a rotational driving force is applied from a worm wheel to a worm gear during manual and automatic opening and closing of a trunk by forming a clearance between a rotor and a bearing formed on a rotating shaft of a driving motor and interposing an elastic ring in the clearance. By damping the axial force generated in the transmission process by the elastic ring, an advantageous effect of reducing noise and vibration generated during manual and automatic opening and closing can be obtained.

According to the present invention, as the Hall sensor for measuring the rotation angle of the rotation shaft is disposed adjacent to each other on the outer circumferential surface of the ring magnet formed on the rotation shaft, the installation of the control board on which the Hall sensor is mounted is easy and advantageous in realizing a compact configuration as a whole. effect can be obtained.

1 is a schematic diagram showing a configuration of opening and closing a trunk of a vehicle by a drive motor;
2 is a perspective view showing the configuration of an opening/closing actuator of a trunk for a vehicle according to an embodiment of the present invention;
Figure 3 is an exploded perspective view of Figure 2;
Figure 4 is an exploded perspective view showing the configuration of a worm wheel engaged with the worm gear of the rotation shaft of Figure 2;
Figure 5 is a front view of Figure 2;
Figure 6 is a cross-sectional view taken along the line XX of Figure 5;
Figure 7 is a side view of Figure 2;
Fig. 8 is a cross-sectional view taken along the cutting line YY in Fig. 7;
Figure 9a is an enlarged view of 'A' part of Figure 6;
Figure 9b is an enlarged view of part 'B' of Figure 9a;
10 is a view showing a configuration in which the magnetic pole of the ring magnet of FIG. 4 is sensed by a hall sensor;
FIG. 11 is a diagram showing a graph of signals sensed by two Hall sensors of FIG. 10 .

Hereinafter, a drive actuator 100 for a vehicle trunk according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, detailed descriptions of well-known functions or configurations will be omitted to clarify the gist of the present invention.

As shown in the drawing, the drive actuator 100 for a vehicle trunk according to an embodiment of the present invention includes a drive motor 110 that receives power and rotates, and a worm gear rotated by the drive motor 110. The rotating shaft 120 on which 122 is formed, the first worm wheel 131 meshing with the first worm gear 1221 of the rotating shaft 120, and the second worm gear 1222 of the rotating shaft 120 meshing The second worm wheel 141, the first transmission gear 132 rotating integrally with the first worm wheel 131, and the second transmission gear 142 rotating integrally with the second worm wheel 141 , the first transmission gear 132 and the second transmission gear 142, the output gear 150 which rotates at the same time, the output shaft 155 which rotates in conjunction with the rotation of the output gear 150, and the output shaft 155 It is configured to include a driving holder 190 fixed to one end of the output shaft 155 and connected to a hinge arm 91 connected to the trunk hood 9 for a vehicle.

The driving motor 110 receives a current through a commutator and includes a rotor 111 integrally assembled with the rotating shaft 120, spaced apart from the rotor 111 in the radial direction, and a N-pole permanent magnet 112N. A stator 112 in which S-pole permanent magnets 112S are alternately arranged and a ring magnet in which N-pole magnets and S-pole magnets are alternately magnetized by being formed in a ring shape at a position spaced apart in the axial direction from the rotor 111 (113) and a casing (114) for fixing the permanent magnet (112).

The rotor 111 rotates forward or reverse by interaction with the stator 112 while being supplied with current through the commutator. The ring magnet 113 is fixed to the rotating shaft 120 so that the N-pole magnet and the S-pole magnet are alternately magnetized and surround the rotating shaft 120.

And, as shown in FIG. 10, two hall sensors 119a and 119b for measuring the hole count of the ring magnet 113 are installed on the control board 119 installed at a position spaced apart from the outer circumferential surface of the ring magnet 113. It is arranged spaced apart in the tangential direction of the ring magnet 113, and detects the number of rotations of the rotating shaft 120.

Here, the brush holder 117 on which the control board 119 is installed is provided with a central penetrating portion through which the rotating shaft 120 passes, and is installed in a non-rotating state, and the terminal of the signal line 118 to which control signals and power are supplied to the outside. is connected to the control board 119 of the brush holder 117 to monitor hall count signals Sa and Sb of the hall sensors 119a and 119b of the control board 119.

As shown in FIG. 11, the hall count signal Sa measured by the a-th Hall sensor 119a and the hall count signal Sb measured by the b-th Hall sensor 119b are 90 per cycle. The distance and position of the a-th Hall sensor 119a and the b-th Hall sensor 119b are determined so as to have a phase difference by degrees. Here, a phase difference of 90 degrees means that a phase difference of 1/4 of one period is generated.

As such, the control board 119 equipped with the hall sensors 119a and 119b is installed on the brush holder 117 and is installed outside the outer circumferential surface of the ring magnet 113, thereby reducing the installation space of the control board 119. It is possible to obtain the effect of increasing measurement accuracy while minimizing it.

The rotating shaft 120 is formed of a metal material such as steel and is rotationally driven by the rotor 111 of the drive motor 110, and a first worm gear 1221 is formed in a first direction in a first region, In the second area, a second worm gear 1222 is formed in a second direction opposite to the first direction. According to another embodiment of the present invention, instead of the worm gear 122 being formed on the rotation shaft 120 on which the rotor 111 of the drive motor 110 is installed, the pinion is coupled to the rotation shaft of the drive motor 110. A worm gear shaft that interlocks with the rotation of (not shown) may be configured to be formed separately.

The first worm wheel 131 meshes with the first worm gear 1221 disposed in the first area of the rotating shaft 120 and rotates, and the second worm wheel 141 is disposed in the second area of the rotating shaft 120. It engages with the second worm gear 1222 and rotates. Here, since the rotational torque of the drive motor 110 is distributed and transmitted to the two worm wheels 131 and 141, the load acting on the first worm wheel 131 and the second worm wheel 141 is divided in half. , It is possible to prevent excessive stress from being concentrated between the worm gears 1221 and 1222 and the worm wheels 131 and 141 in the course of transmitting rotational torque from the drive motor 110 to the trunk hood 9. Accordingly, the worm wheels 131 and 141 and the transmission gears 132 and 142 may be formed of a light plastic or resin material to contribute to reducing the weight of the driving actuator 100 .

At this time, since the first worm gear 1221 and the second worm gear 1222 are worm gears formed in opposite directions, the first worm wheel 131 and the second worm gear meshing with them 1221 and 1222 The wheel 141 rotates in the same direction. Referring to FIG. 4, for example, when the rotary shaft 120 rotates in the forward direction 120r, the first worm wheel 131 meshed with the first worm gear 1221 rotates clockwise 131r, and at the same time The second worm wheel 141 engaged with the 2 worm gear 1222 also rotates clockwise 141r. Conversely, when the rotating shaft 120 rotates in the reverse direction, the first worm wheel 131 meshing with the first worm gear 1221 rotates counterclockwise, and at the same time, the second worm wheel 131 meshing with the second worm gear 1222. The worm wheel 141 also rotates counterclockwise.

The first transmission gear 132 integrally coaxially formed with the first worm wheel 131 rotates integrally with the first worm wheel 131, and the second transmission gear integrally formed coaxially with the second worm wheel 141 ( 142) rotates integrally with the second worm wheel 141. Here, the transmission gears 132 and 142 are formed as helical gears to transmit rotational torque to the output gear 150 more efficiently.

The output gear 150 is installed in a state of meshing with the first transmission gear 132 and the second transmission gear 142 at the same time, and the first transmission gear 132 and the second transmission gear 142 rotate in the same direction. It receives rotational driving force from and is driven to rotate. The output gear 150 rotates integrally with the output shaft 155, and at the end of the output shaft 155, a drive holder 190 connecting the hinge arm 91 connected to the trunk hood 9 in the accommodation space 190x is provided. It is fixed.

Accordingly, when the drive motor 110 rotates the rotating shaft 120 in the forward or reverse direction, accordingly, the two worm wheels 131 and 141 meshed with the worm gears 1221 and 1222 of the rotating shaft 120 are identical. direction, and the output gear 150 is rotated while the transmission gears 132 and 142 integrally formed with the worm wheels 131 and 141 rotate in the same direction, thereby rotating the hinge arm 91 of the trunk hood 9 ) serves to open or close the trunk hood 9 by moving 91d.

Meanwhile, there is a case where the user manually applies a force Mx to lift the trunk hood 9 or a force Mx' to press it down. Conventionally, the driving actuator is composed of only a spur gear or a helical gear to allow a user to manually open and close the trunk hood 9 while opening and closing the trunk hood 9 using an electric motor. However, spur gears and helical gears have limitations in increasing the volume and weight of the actuator.

According to a preferred embodiment of the present invention, since the rotational driving force of the drive motor 110 is transmitted from the worm gears 1221 and 1222 to the worm wheels 131 and 141 as described above, the volume of the drive actuator 100 and By significantly lowering the weight compared to the prior art, it is possible to obtain an effect of higher fuel efficiency while occupying less installation space of the vehicle.

At the same time, when forces (Mx, Mx') manually applied by the user act on the trunk hood 9, the output shaft 155, the output gear 150, and the transmission gear ( 132 and 142, the worm wheels 131 and 141, and the worm gears 1221 and 1222, rotational torque is transmitted.

In order to transmit rotational driving force from the worm wheels 131 and 141 to the worm gear 122, the lead angle (ang) of the first worm wheel 131 and the second worm wheel 141 is 7 degrees to 30 degrees. It is preferable that a road lead angle (ang) is formed. This is because when the lead angle (ang) of the worm wheels 131 and 141 is less than 7 degrees, the back drive torque is large, so that the rotation of the worm wheels 131 and 141 is not transmitted to the worm gear 123. condition, and at the same time, when the lead angle of the worm wheels 131 and 141 is greater than 30 degrees, frictional loss of the threaded surface in the process of transmitting rotational driving force from the worm gear to the worm wheel increases, resulting in lower transmission efficiency. More preferably, the lead angle of the worm wheels 131 and 141 is preferably formed at 10 to 20 degrees, and through this, optimal torque transmission is achieved by reducing the frictional loss of the screw surface while being almost unaffected by the back drive torque. this becomes possible

On the other hand, when the worm gears 1221 and 1222 and the worm wheels 131 and 141 rotate in meshing state, the rotation shaft 120 on which the worm gears 1221 and 1222 are formed rotates toward one side or the other side according to the direction of rotation. As much as the axial force (120F) acts.

Above all, according to a preferred embodiment of the present invention, both ends of the rotating shaft 120 are rotationally supported by bearings 128 and 129, and in particular, the outer diameter of the rotating shaft 120 is larger than that of the inner rings of the bearings 128 and 129. It is formed smaller and is installed to enable sliding movement (120d) with respect to any one or more inner rings of bearings 128 and 129. At the same time, the insulation bracket 111a of the rotor 111 integrally installed on the rotating shaft 120 with an insulating material is disposed to have an axial clearance c between the bearing 128 and the bearing 128 .

Therefore, when the worm gears 1221 and 1222 and the worm wheels 131 and 141 are meshed with each other and rotate in the forward or reverse direction, an axial force 120F equal to the gear backlash in one or the other direction acts on the rotating shaft 120. , The rotating shaft 120 moves in the axial direction by the length corresponding to the axial gap c by the axial force 120F (120d), and the axial force 120F moves the worm gears 1221 and 1222 and the worm gears 1221 and 1222. A large stress is prevented from being concentrated on the contact surface of the meshing teeth of the wheels 131 and 141.

In other words, if the rotating shaft 120 is coupled to the inner rings of the bearings 128 and 129 in an interference fit state, or if the rotating shaft 120 is restricted from moving 120d in the axial direction, the worm gear 1221 , 1222) and the worm wheels 131 and 141 are meshed with each other to rotate in the forward or reverse direction, and the worm gears 1221 and 1222 meshed with each other by the axial force 120F pushing the rotating shaft 120 in one or the other direction A large stress is concentrated on the contact surface of the teeth of the wheels 131 and 141, so that a high friction state is inevitably maintained. Due to this, when the user manually opens and closes the trunk hood 9, the rotational driving force must be transmitted from the worm wheels 131 and 141 to the worm gears 1221 and 1222. If large stress is concentrated between the wheels 131 and 141 and maintained in a high friction state, the rotation of the worm gears 1221 and 1222 is restricted, resulting in a problem in that the manual opening and closing operation cannot be smoothly operated.

However, in the present invention, the rotating shaft 120 is installed to enable sliding movement 120d with respect to the bearings 128 and 129 while being rotationally supported by the bearings 128 and 129, and the rotational shaft 120 in the axial direction As it is installed to have an axial gap c allowing sliding movement, the axial force 120F of the rotating shaft 120 generated by the engagement rotation of the worm gears 1221 and 1222 and the worm wheels 131 and 141 Since the axis of rotation 120 is allowed to move 120d in the axial direction, stress is not concentrated on the meshing teeth of the worm gears 1221 and 1222 and the worm wheels 131 and 141. Accordingly, when the user manually applies force (Mx, Mx') to open and close the trunk hood 9, the worm wheels 131 and 141 rotate in the forward or reverse direction, and the worm wheels 131 and 141 rotate. As the worm gears 1221 and 1222 engaged therewith also rotate in the forward or reverse direction by rotation, the user's manual manipulation can be smoothly allowed.

In particular, as shown in FIGS. 9A and 9B , an elastic ring 160 may be interposed in an axial gap c between the one side bearing 128 and the rotor 111 while wrapping the rotational shaft 120. there is. That is, the elastic ring 160 is disposed to be interposed between the inner ring 128i of the one side bearing 128 disposed outside the rotor 111 and the insulation bracket 111a fixing the rotor 111 to the rotation shaft. and is compressed and deformed by the axial movement of the rotating shaft 120. Through this, when the rotating shaft 120 slides in the direction toward the one-sided bearing 128, the elastic ring 160 is compressed and serves to reduce the noise and vibration caused by the movement. .

On the other hand, when the user forcibly opens and closes the trunk, when the movement 120d in the axial direction of the rotating shaft 120 is instantaneously generated by the backlash of the gear, the flexible elastic ring 160 is provided with an insulation bracket ( 111a) and the force 160F trying to escape the inner ring 128i of the bearing 128 acts, and the elastic ring 160 rides on the bearing shield 128x surrounding the ball of the bearing 128 from its original position. Exodus problems may arise. Furthermore, if the state in which the elastic ring 160 is positioned between the inner ring 128i of the bearing 128 and the insulating bracket 111a of the rotor 111 is not maintained, the axial movement of the rotating shaft 120 (120d) The back drive torque increases rapidly due to the impact force, causing serious problems such as damage to gear teeth such as worm wheels 131 and 141 or worm gears 1221 and 1222 or making it impossible to manually open and close the trunk. do.

In order to prevent this, as shown in FIG. 9B, a ring-shaped receiving groove 120x for accommodating the elastic ring 160 is formed on the rotating shaft 120, and the elastic ring 160 is placed in the receiving groove 120x. Some or more can be accommodated. In this way, as a part of the elastic ring 160 is accommodated in the receiving groove 120x, despite the impulse force 160F acting on the elastic ring 160, the insulation bracket 111a and the bearings 128 and 129 It becomes possible to more reliably maintain the state pinched between the inner races. Therefore, the state in which the elastic ring 160 is positioned between the inner ring 128i of the bearing 128 and the insulating bracket 111a of the rotor 111 is stably maintained, and thus, the axial direction of the rotating shaft 120 By restraining the back drive torque from rapidly increasing due to the impact force according to the movement 120d, damage to gear teeth such as the worm wheels 131 and 141 or the worm gears 1221 and 1222 does not occur, and the manual trunk The advantageous effect of allowing the opening and closing process to continue reliably can be obtained.

At this time, the elastic ring 160 has a depth of the receiving groove 128x of the rotating shaft 120 so as to maintain a state of being sandwiched between the insulation bracket 111a of the rotor 111 and the inner rings of the bearings 128 and 129. It is decided. For example, the depth of the receiving groove 128x may be set to 20% to 50% of the diameter of the elastic ring 160 . As shown in FIG. 9B, an inclined chamfer 111ay is provided on the bottom surface of the end of the insulation bracket 111a facing the receiving groove 128x, and at the same time, an inclined chamfer 128iy is provided on the bottom surface of the inner ring of the bearing 128. ) is provided, so that the sandwiched state between the insulation bracket 111a and the inner rings of the bearings 128 and 129 can be more reliably maintained despite the impulsive force 160F acting on the elastic ring 160. Here, the 'bottom surface' refers to a surface in contact with the axis of rotation.

Although not shown in the drawing, an axial clearance is formed in the form of play in the other bearing 129 supporting the other side of the rotation shaft 120, and an elastic ring is interposed in the axial clearance, so that the rotation shaft 120 moves in the other direction. It may be configured to reduce noise and vibration generated during sliding movement.

Meanwhile, instead of an elastic ring being installed at the other end of the rotary shaft 120, a cap 170 made of a compressible deformable material and accommodating the end of the rotary shaft 120 may be provided. Here, the cap 170 is formed in the form of a groove for accommodating the other end of the rotation shaft 120, and is formed of a material that is compressed and deformed by sliding movement 120d in the direction of the other side of the rotation shaft 120. For example, the cap 170 may be formed of a material such as urethane, rubber, plastic, or resin.

Accordingly, in a state in which the rotation shaft 120 slides in one direction, an empty space (gap or axial clearance) that is not filled with the rotation shaft 120 is generated inside the groove of the cap 170, and the rotation shaft 120 In the state of sliding in the other end direction, the rotating shaft 120 fills the inside of the groove of the cap 170 to reduce or remove the empty space. Through this, it is possible to obtain an effect of reducing noise and vibration generated during the sliding movement of the rotating shaft 120 in the other direction.

However, the present invention is not limited to a configuration in which the cap 170 is provided at the other end of the rotation shaft 120, and although not illustrated in the drawings, the other end of the rotation shaft 120 is also like one end of the rotation shaft 120, the bearing ( The inner ring of 129) is formed to be able to slide with respect to the rotating shaft 120, and at the same time, a protruding part similar to the insulation bracket 111a is formed at the other end of the rotating shaft 120 (for example, the other end of the second worm gear) An elastic ring (not shown) capable of elastic deformation may be interposed between the inner ring and the bearing 129 .

The driving actuator 100 of the vehicle trunk according to an embodiment of the present invention configured as described above converts the rotational torque of the driving motor 110 to the trunk hood 9 through the worm gear 122 and the worm wheels 131 and 141. ), a compact structure with a small volume is implemented, and at the same time, the range of lead angles of the warham wheels 131 and 141 is set to 7 degrees to 30 degrees, so that the trunk hood 9 is pushed or pulled (Mx , Mx') is accommodated by the worm gear 122 and the worm wheels 131 and 141, thereby obtaining an advantageous effect of enabling torque transmission in a compact structure without damaging parts.

Above all, in the present invention, the rotation shaft 120 on which the worm gear 122 is formed is installed so as to be axially movable with respect to the bearing for rotation support, and at the same time, the clearance c in the axial direction of the rotation shaft 120 is formed in advance By doing so, the frictional resistance between the worm wheels 131 and 141 and the worm gears 1221 and 1222 is reduced, so that the manual rotation driving force is transmitted from the trunk hood 9 to the worm gear 122 in a low-friction state. By rotating the worm gears 1221 and 1222 by the worm wheels 131 and 141, an advantageous effect of enabling manual and electrically operated opening and closing of the trunk with low noise and low vibration can be obtained.

In the above, preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited only to these specific embodiments, and can be appropriately changed within the scope described in the claims.

100: drive actuator 110: drive motor
111: rotor 111a: insulation bracket
119: control board 119a, 119b: hall sensor
120: rotation axis 122: worm gear
1221: first worm gear 1222: second worm gear
131: first worm wheel 132: first transmission gear
141: second worm wheel 142: second transmission gear
150: output gear 155: output shaft
160: elastic ring 170: cap

Claims (13)

As a driving actuator for opening and closing the vehicle trunk,
a drive motor;
a rotational shaft having a first worm gear formed in a first direction in a first area and a second worm gear formed in a second direction opposite to the first direction in a second area, and rotationally driven by the driving motor;
a first worm wheel engaged with the first worm gear;
a first transmission gear that rotates integrally with the first worm wheel;
a second worm wheel engaged with the second worm gear;
a second transmission gear that rotates integrally with the second worm wheel;
an output gear that rotates while being simultaneously engaged with the first transmission gear and the second transmission gear;
an output shaft that rotates in conjunction with the rotation of the output gear;
a driving holder fixed to the output shaft, rotating together with the output shaft, and connected to a connection bracket connected to a trunk hood for a vehicle;
Including, both ends of the rotating shaft are rotatably supported by bearings, installed to be movable in the axial direction with respect to the inner ring of the bearing, and an axial clearance of a predetermined gap between the rotor of the drive motor and the bearing A drive actuator for a vehicle trunk, characterized in that formed.
According to claim 1,
The drive actuator for a vehicle trunk, characterized in that the first worm wheel and the first transmission gear are integrally molded of a plastic material, and the second worm wheel and the second transmission gear are integrally molded of a plastic material.
According to claim 1,
A drive actuator for a vehicle trunk, characterized in that the rotor of the drive motor, the first worm gear, and the second worm gear are installed together on the rotation shaft.
delete delete According to claim 1,
A driving actuator for a vehicle trunk, characterized in that the lead angle of the first worm wheel and the second worm wheel is formed from 7 degrees to 30 degrees.
According to claim 1,
A drive actuator for a vehicle trunk, characterized in that a cap covering an end of a material capable of compressive deformation is provided at one end of the rotating shaft.
According to claim 1,
A drive actuator for a vehicle trunk, characterized in that an elastic ring formed of a material capable of elastic deformation is provided in an axial clearance space between the rotor of the drive motor and the bearing.
According to claim 8,
The drive actuator for a vehicular trunk, characterized in that the elastic ring is interposed between an insulating bracket fixing the rotor and an inner ring of the bearing, and is compressed and deformed by an axial movement of the rotating shaft.
According to claim 9,
A drive actuator for a trunk for a vehicle, characterized in that a ring-shaped accommodating groove accommodating the elastic ring is formed on the rotating shaft, and at least a portion of the elastic ring is accommodated in the accommodating groove.
According to claim 10,
A driving actuator for a vehicle trunk, characterized in that an inclined chamfer is formed on at least one of a bottom surface of an end of the insulation bracket facing the receiving groove and a bottom surface of the inner ring of the bearing.
As a driving actuator for opening and closing the vehicle trunk,
a drive motor;
a rotational shaft having a first worm gear formed in a first direction in a first area and a second worm gear formed in a second direction opposite to the first direction in a second area, and rotationally driven by the driving motor;
a first worm wheel engaged with the first worm gear;
a first transmission gear that rotates integrally with the first worm wheel;
a second worm wheel engaged with the second worm gear;
a second transmission gear that rotates integrally with the second worm wheel;
an output gear that rotates while being simultaneously engaged with the first transmission gear and the second transmission gear;
an output shaft that rotates in conjunction with the rotation of the output gear;
a driving holder fixed to the output shaft, rotating together with the output shaft, and connected to a connection bracket connected to a trunk hood for a vehicle;
In the drive motor, a ring magnet having N and S poles alternately magnetized is provided to surround the rotating shaft, and a hole count of the ring magnet is measured on a control board installed at a position spaced apart from an outer circumferential surface of the ring magnet. A drive actuator for a vehicle trunk, characterized in that two hall sensors are disposed.
According to claim 12,
The vehicle trunk drive actuator, characterized in that the distance and location of the hall sensors are determined so that the hall count signal detected by the hall sensor has a phase difference of 90 degrees between unit signals.

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