Multi-motion planetary gear device

Abstract

A multi-motion planetary gear device according to one embodiment of the present invention is characterized by comprising: a sun gear connected to the shaft of an actuator; a carrier having at least one planetary gear arranged along a circumferential direction centered on the sun gear and meshing with the sun gear; a ring gear having an internal gear on its inner surface that meshes with the planetary gear; and a blocker disposed between the ring gear and the carrier and sliding axially according to a tilting stroke and a sliding stroke to restrain the rotation of either the ring gear or the carrier.

Description

Technology Field

[0001] The present invention relates to a multi-motion planetary gear device capable of implementing different motion movements. Background Technology

[0003] Active air skirts automatically adjust the position of the air skirt (a device that controls airflow between the vehicle floor and the road) according to driving conditions, thereby reducing air resistance, improving fuel efficiency, and enhancing stability during high-speed driving. As this system significantly impacts vehicle performance, precise position control and dynamic adjustment capabilities are essential.

[0004] Active air skirts must be able to control the movement of the air skirt in real time according to various conditions, and for this purpose, various types of power transmission devices and drive systems are required. In particular, since air skirts must exhibit various movements depending on the vehicle speed, driving angle, and road conditions, multi-motion control is required. Accordingly, separate actuators are provided for each motion required in the active air skirt.

[0005] However, with this method, there was a problem in that the active air skirt system became complex, which not only lowered system reliability but also increased the weight of the active air skirt. The problem to be solved

[0007] The present invention aims to provide a multi-motion planetary gear device to solve the aforementioned problem.

[0008] Furthermore, it is evident that the technical challenges are not limited to those described above, and that other technical challenges may be derived from the following description. means of solving the problem

[0010] A multi-motion planetary gear device according to one embodiment of the present invention is characterized by comprising: a sun gear connected to the shaft of an actuator; a carrier having at least one planetary gear arranged along a circumferential direction centered on the sun gear and meshing with the sun gear; a ring gear having an internal gear on its inner surface that meshes with the planetary gear; and a blocker disposed between the ring gear and the carrier and sliding axially according to the first motion stroke and the second motion stroke to restrain the rotation of either the ring gear or the carrier.

[0011] The blocker is characterized by sliding in the direction of the carrier during the first motion stroke to fix the carrier, and sliding in the direction of the ring gear during the second motion stroke to fix the ring gear.

[0012] The blocker is characterized by including a first elastic member that supports the blocker in the direction of the ring gear; and a second elastic member that supports the blocker in the direction of the carrier.

[0013] The blocker is characterized by comprising: a first guide portion formed on the edge of the surface facing the carrier and restricting the rotation of the carrier; and a second guide portion formed on the edge of the surface facing the ring gear and restricting the rotation of the ring gear.

[0014] The first guide member comprises a first inclined surface that induces rotation of the carrier and a first stepped portion that limits rotation of the carrier, and the second guide member comprises a second inclined surface that induces rotation of the ring gear and a second stepped portion that limits rotation of the ring gear.

[0015] The above carrier is characterized by including a first cam guide portion formed on the edge of the surface facing the blocker and sliding the blocker in the direction of the ring gear.

[0016] The above ring gear is characterized by including a second cam guide portion formed on the edge of the surface opposite to the blocker and sliding the blocker in the direction of the carrier.

[0017] The above ring gear is characterized by including a first link portion that tilts the active air skirt.

[0018] The above carrier has a first guide slot formed along the circumferential direction, the above blocker has a second guide slot formed along the circumferential direction, and the above ring gear is characterized by having an idler pin formed that is inserted into the first guide slot and the second guide slot.

[0019] The second guide slot is formed by the rotation angle of the first motion stroke, and the first guide slot is formed to be longer than the second guide slot by the rotation angle of the second motion stroke.

[0020] The above carrier is characterized by including a first gear protruding in a ring shape and further including a second gear disposed on the idler pin and meshing with the first gear.

[0021] The above second gear is characterized by including a link connecting part connected to a second link part that slides the inner skirt of the active air skirt. Effects of the invention

[0023] The present invention has the effect of not only being able to perform tilting and sliding motions with a single actuator, but also improving system reliability by reducing the number of parts and making the product lighter.

[0024] Furthermore, since the effects of the present invention described above are naturally manifested by the composition of the described content regardless of whether the inventor is aware of them, the aforementioned effects are merely a few effects based on the described content and should not be recognized as describing all effects that the inventor has grasped or that actually exist.

[0025] In addition, the effects of the present invention should be further understood from the overall description in the specification, and even if not explicitly stated, if an effect can be recognized as such by a person of ordinary knowledge in the technical field to which the described content belongs through the present specification, it should be considered as an effect described in the present specification. Brief explanation of the drawing

[0027] FIG. 1 is a drawing showing an active air skirt according to one embodiment of the present invention. FIG. 2 is a drawing showing the planetary gear device according to one embodiment of the present invention in its entirety. FIG. 3 is a diagram showing a disassembled planetary gear device according to one embodiment of the present invention. FIG. 4 is a drawing showing a cross-section of a planetary gear device according to one embodiment of the present invention. FIG. 5 is a drawing showing the internal configuration of the housing of a planetary gear device according to one embodiment of the present invention. FIG. 6 is a drawing showing, from one side, the internal configuration of the housing of a planetary gear device according to one embodiment of the present invention. FIG. 7 is a drawing showing the internal configuration of the housing of a planetary gear device according to one embodiment of the present invention disassembled from another side. FIG. 8 is a drawing showing the process of deploying an active air skirt by sequentially performing a tilting stroke and a sliding stroke in the stowed state (or initial state) of an active air skirt according to one embodiment of the present invention, and the process of stowing by sequentially performing a sliding stroke and a tilting stroke in reverse. FIG. 9 is a drawing showing the state of the carrier, ring gear, and blocker in the initial state (or stowed state) of an active air skirt according to one embodiment of the present invention. FIG. 10 is a drawing showing the state of the carrier, ring gear, and blocker when a tilting stroke is performed on the outer skirt according to one embodiment of the present invention. FIG. 11 is a drawing showing the state of the carrier, ring gear, and blocker when a sliding stroke is performed on the inner skirt according to one embodiment of the present invention. FIG. 12 is a drawing showing the initial state (or storage state) of the active air skirt (1). Fig. 13 is a drawing showing the tilting stroke performed on the outer skirt of the active air skirt. Figure 14 is a drawing showing the sliding stroke performed on the inner skirt of the active air skirt. Specific details for implementing the invention

[0028] It should be noted that in assigning reference numbers to the components of each drawing in this specification, identical components are given the same number as much as possible, even if they are shown in different drawings.

[0029] Meanwhile, the meaning of the terms described in this specification should be understood as follows. Singular expressions should be understood to include plural expressions unless the context clearly defines otherwise, and terms such as "first," "second," etc. are intended to distinguish one component from another, and the scope of rights should not be limited by these terms. Terms such as "include" or "have" should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0030] The term “at least one” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of “at least one of the first item, the second item and the third item” is not only the first item, the second item, or the third item individually, but also all combinations of items that can be presented from two or more of the first item, the second item, and the third item.

[0031] FIG. 1 is a drawing showing an active air skirt according to an embodiment of the present invention. The active air skirt (1) according to the present invention may include an outer skirt (2), an inner skirt (3), a first link portion (5), a second link portion (6), an actuator (8), and a multi-motion planetary gear device (10, hereinafter referred to as 'planetary gear device').

[0032] The outer skirt (2) forms the outer surface of the active air skirt (1) and can be tilted through a planetary gear device (10) driven by an actuator (8).

[0033] The inner skirt (3) is slidably positioned on the inner side of the outer skirt (2) and can be slid first through the second link portion (6) of the planetary gear device (10) connected to the shaft (9) of the actuator (8) and unfolded beyond the end of the outer skirt (2).

[0034] The first link section (5) is connected to the planetary gear unit (10) and can tilt the outer skirt (2) according to the operation of the planetary gear unit (10). The second link section (6) is connected to the link connecting section (7) of the planetary gear unit (10) and can slide and unfold the inner skirt (2) according to the operation of the planetary gear unit (10). Here, the second link section (6) may have a two-section link structure to allow the inner skirt (2) to slide.

[0035] In this way, the active air skirt (1) according to the present invention requires multi-motion as tilting of the outer skirt (2) and sliding of the inner skirt (3) are performed.

[0036] In the conventional case, actuators (8) were provided for each outer skirt (2) and inner skirt (3), or multi-motion was implemented through additional brakes or electrical devices. Consequently, not only did costs increase, but system reliability was low due to the complex system, and there was a problem that the fuel efficiency and performance of the vehicle deteriorated as the space and weight of the active air skirt (1) increased.

[0037] To solve this problem, the present invention enables multi-motion to be performed through a planetary gear device (10) connected to a single actuator (8).

[0038] According to the present invention, the planetary gear device (10) is connected to the shaft (9) of the actuator (8) to tilt the outer skirt (2) through the first link portion (5) and slide the inner skirt (3) through the second link portion (6).

[0039] Although the planetary gear device (10) according to the present invention has been described as being applied to an active air skirt, it can be applied to various aerodynamic devices such as spoilers, active air flaps, and diffusers, and can also be applied to devices for power transmission.

[0040] In addition, although the planetary gear device (10) was described as performing tilting and sliding, it is capable of performing various operations through two different rotational movements in addition to tilting and sliding.

[0041] However, below, for convenience of explanation, the planetary gear device (10) is described as being applied to an active air skirt, and the first motion and the second motion, which are two different operations performed through two different rotational movements, are described as performing tilting and sliding, with the first motion being tilting and the second motion being sliding.

[0042] In addition, the first motion stroke, which is the movement for performing the first motion, will be described as a tilting stroke, and the second motion stroke, which is the movement for performing the second motion, will be described as a sliding stroke.

[0043] Hereinafter, the planetary gear device (10) according to the present invention will be described in more detail with reference to FIGS. 2 to 10.

[0044] FIG. 2 is a drawing showing the planetary gear device (10) according to an embodiment of the present invention in its entirety. FIG. 3 is a drawing showing the planetary gear device (10) according to an embodiment of the present invention in a disassembled state. FIG. 4 is a drawing showing a cross-section of the planetary gear device (10) according to an embodiment of the present invention. FIG. 5 is a drawing showing the internal configuration of the housing of the planetary gear device (10) according to an embodiment of the present invention. FIG. 6 is a drawing showing the internal configuration of the housing of the planetary gear device (10) according to an embodiment of the present invention in a disassembled state from one side. FIG. 7 is a drawing showing the internal configuration of the housing of the planetary gear device (10) according to an embodiment of the present invention in a disassembled state from another side.

[0045] As illustrated in FIGS. 2 to 7, the planetary gear device (10) according to the present invention may include a housing (11), a housing cover (15), a sun gear (20), a carrier (30), a ring gear (40), and a blocker (50).

[0046] The housing (11) has a hole formed therein through which the shaft (9) of the actuator (8) passes, and each component is arranged therein. The housing (11) has a first guide hole (14) formed on the side so that the first link part (5) can move. The housing (11) has a support member (13) formed therein to which the blocker (50), to be described later, is fixed.

[0047] The housing cover (13) covers the housing (11) so that each component can be accommodated. The housing cover (13) has a second guide hole (16) formed therein so that the link connecting part (7), to which the second link part (5) is connected, can move.

[0048] The sun gear (20) is connected to the shaft (9) of the actuator (8) to transmit power to each component. At least one planetary gear (32), which will be described later, is arranged along the circumferential direction in the radial direction of the sun gear (20). The sun gear (20) can mesh with the planetary gear (32) to transmit power to the actuator (8).

[0049] The carrier (30) is positioned so that the shaft (9) of the actuator (8) connected to the sun gear (20) passes through it, and is positioned between the housing cover (13) and the blocker (50) to be described later.

[0050] The carrier (30) is equipped with at least one planetary gear (32) that meshes with the sun gear (20). The planetary gear (32) may be arranged along the circumferential direction around the sun gear (20). Although the drawing shows three planetary gears (32), this is merely one embodiment and is not limited thereto. The planetary gear (32) meshes with the internal gear (42) of the ring gear (40) to be described later.

[0051] The planetary gear (32) rotates according to the rotation of the sun gear (20) to rotate the ring gear (40) on which the internal gear (42) is formed, or to rotate the carrier (30). Specifically, when the carrier (30) is fixed by the blocker (50) to be described later, the planetary gear (32) rotates on its own axis so that the ring gear (40) is rotated by the internal gear (42). When the ring gear (40) is fixed by the blocker (50) to be described later, the planetary gear (32) revolves along the sun gear (20) and rotates the carrier (30). At this time, the rotation direction of the carrier (30) has a direction opposite to the rotation direction of the ring gear (40).

[0052] The carrier (30) has a fixed portion (35) formed along the circumferential direction in which a planetary gear (32) is disposed on the surface facing the blocker (50). In addition, the carrier (30) has a first guide slot (36) formed along the circumferential direction in which an idler pin (44) of a ring gear (40), to be described later, is inserted. Here, the first guide slot (36) can be formed to the rotation angle of the tilting stroke and the sliding stroke. At this time, the first guide slot (36) stops the carrier (30) so that the idler pin (44) is caught during the sliding stroke, thereby completing the sliding stroke of the carrier (30).

[0053] A first gear (34) is formed on the surface of the carrier (30) facing the housing cover (13) in a ring shape. The first gear (34) meshes with a second gear (46) connected to an idler pin (44) to be described later.

[0054] Meanwhile, the carrier (30) has a first cam guide portion (300) formed on the edge of the surface facing the blocker (50) to push the blocker (50) in the direction of the ring gear (40) when rotated. The first cam guide portion (300) engages with the first guide portion (500) formed on the edge of the blocker (50) to be described later so that the carrier (30) is fixed, or pushes the first guide portion (500) in the direction of the ring gear (40) so that the blocker (50) is separated, thereby allowing the carrier (30) to rotate.

[0055] As shown in FIG. 5, the first cam guide section (300) is formed with a first cam inclined section (302) formed at an angle so that the blocker (50) is smoothly separated, and a first cam stepped section (304) formed so that the rotation of the carrier (30) by the blocker (50) is restricted.

[0056] A fixing hole (310) is formed in the carrier (30) into which the first fixing projection (520) of the blocker (50), which will be described later, is inserted. The fixing hole (310) allows the first fixing projection (520) of the blocker (50) to be inserted to restrict the rotation of the carrier (30). Here, a stepped groove may be extended along the circumferential direction in the fixing hole (310) so that the first fixing projection (520) can rotate along the rotation direction.

[0057] The ring gear (40) is positioned so that the shaft (9) of the actuator (8) to which the sun gear (20) is connected passes through it, and is positioned between the housing (11) and the blocker (50).

[0058] The ring gear (40) is equipped with an internal gear (42) that meshes with the planetary gear (32) on its inner surface.

[0059] The internal gear (42) causes the ring gear (40) to rotate according to the rotation of the planetary gear (32). At this time, the internal gear (42) rotates when the planetary gear (32) rotates and is fixed when it revolves.

[0060] Specifically, when the blocker (50), which will be described later, fixes the carrier (30), the planetary gear (32) may rotate according to the rotation of the sun gear (20) and may rotate according to the rotation of the planetary gear (32). When the blocker (50) fixes the ring gear (40), the planetary gear (42) may be fixed so that the planetary gear (32) revolves around the sun gear (20) according to the rotation of the sun gear (20).

[0061] A first link portion (5) is formed on the surface of the ring gear (40) facing the housing (11). The first link portion (5) is formed to protrude outwardly from the ring gear (40) and can move along the first guide hole (14) of the housing (11) when the ring gear (40) rotates.

[0062] An idler pin (44) is formed on the ring gear (40) on the surface facing the blocker (50). The idler pin (44) is inserted into the first guide slot (36) of the carrier (30) and the second guide slot (52) of the blocker (50) to be described later, and moves within the range of the first guide slot (36) and the second guide slot (52) according to the rotation of the ring gear (40).

[0063] A second gear (46) that meshes with the first gear (34) of the carrier (30) is disposed on the idler pin (44). Here, the second gear (46) revolves along the first gear (34) when the ring gear (40) rotates, and rotates according to the rotation of the first gear (34) when the ring gear (40) is fixed. Specifically, when the carrier (30) is fixed by the blocker (50) to be described later, the second gear (46) revolves around the first gear (34) as the ring gear (40) rotates and moves along the idler pin (44). When the ring gear (40) is fixed by the blocker (50) to be described later, the first gear (34) rotates according to the rotation of the carrier (30), and the second gear (46) rotates according to the rotation of the first gear (34).

[0064] Meanwhile, a link connection part (7) to which the second link part (6) is connected is formed in the central part of the second gear (46). Accordingly, when the carrier (30) rotates the second gear (46), the second link part (6) slides the inner skirt (3), and when the ring gear (40) rotates the second gear (46), only joint movement occurs in the second link part (6), and the inner skirt (3) is fixed.

[0065] Meanwhile, the ring gear (40) has a second cam guide portion (400) formed on the edge of the surface facing the blocker (50) to push the blocker (50) toward the carrier (30) when rotated. The second cam guide portion (400) engages with the second guide portion (510) formed on the edge of the blocker (50), which will be described later, to fix the ring gear (40), or pushes the second guide portion (510) toward the carrier (30) to separate the blocker (50), thereby allowing the ring gear (40) to rotate.

[0066] As shown in FIG. 5, the second cam guide section (400) is formed with a second cam inclined section (402) formed at an angle so that the blocker (50) is smoothly spaced apart, and a second cam stepped section (304) formed so that the rotation of the ring gear (40) by the blocker (50) is restricted.

[0067] A fixing groove (410) is formed on the surface of the ring gear (40) facing the blocker (50), into which the second fixing projection (530) of the blocker (50), which will be described later, is inserted. The fixing groove (410) can restrict the rotation of the ring gear (40) by inserting the second fixing projection (530) of the blocker (50).

[0068] Here, a stepped groove may be extended along the circumferential direction in the fixed groove (410) so that the second fixed projection (530) can rotate along the rotational direction.

[0069] The blocker (50) is positioned between the carrier (30) and the ring gear (40) and slides axially according to the tilting stroke and sliding stroke to restrict the rotation of either the carrier (30) or the ring gear (40).

[0070] The blocker (50) can be slid in the direction of the carrier (30) during a tilting stroke to fix the carrier (30), and can be slid in the direction of the ring gear (40) during a sliding stroke to fix the ring gear (40).

[0071] A second guide slot (52) is formed along the circumferential direction in the blocker (50). An idler pin (44) of the ring gear (40) is inserted into the second guide slot (52) and guides the idler pin (44) when the ring gear (40) rotates. At this time, the second guide slot (52) can be formed to the rotation angle of the tilting stroke. The second guide slot (52) stops the ring gear (40) so that the tilting stroke of the ring gear (40) can be completed by engaging the idler pin (44) during the tilting stroke.

[0072] Here, the second guide slot (52) is positioned to overlap with the first guide slot (36) of the carrier (30). One end of the second guide slot (52) may be aligned with one end of the first guide slot (36), or the other end of the second guide slot (52) may be aligned with the other end of the first guide slot (36).

[0073] Specifically, when tilting stroke and when starting sliding stroke, one end of the second guide slot (52) is positioned to align with one end of the first guide slot (36) of the carrier (30), and when the sliding stroke is completed, the other end of the second guide slot (52) and the other end of the first guide slot (36) are positioned to align.

[0074] During the tilting stroke, the idler pin (44) rotates from one end to the other along the first guide slot (36) and the second guide slot (52) due to the rotation of the ring gear (40), so the first guide slot (36) and the second guide slot (52) are positioned with one end aligned, but during the sliding stroke, the second guide slot (52) rotates from the other end to one end due to the rotation of the carrier (30).

[0075] Accordingly, the second guide slot (52) can be formed by the rotation angle of the tilting stroke, and the first guide slot (52) can be formed by the rotation angle of the tilting stroke and the sliding stroke.

[0076] In the blocker (50), fixing parts (54) are formed on both sides, and insertion holes (55) are formed in the fixing parts (54). The fixing parts (54) are inserted into the support member (13) of the housing (11) through the insertion holes (55). Accordingly, the blocker (50) can be fixed to the housing (11).

[0077] The blocker (50) may include a first elastic member (56) and a second elastic member (58) to elastically support the fixed part (54). The first elastic member (56) is inserted into the support member (13) in the direction from the carrier (30) to the ring gear (40) and elastically supports the fixed part (54) in the direction of the ring gear (40). The second elastic member (58) is inserted into the support member (13) in the direction from the ring gear (40) to the carrier (30) and elastically supports the fixed part (54) in the direction of the carrier.

[0078] Accordingly, the blocker (50) can be elastically supported by the first elastic member (56) and the second elastic member (58) and slide axially along the support member (13) of the housing (11).

[0079] Meanwhile, the blocker (50) includes a first guide part (500) that restricts the rotation of the ring gear (30) and a second guide part (510) that restricts the rotation of the carrier (40).

[0080] The first guide portion (500) is formed on the edge of the surface facing the carrier (30). The first guide portion (500) can be pushed in the direction of the ring gear (30) by the first cam guide portion (300) of the carrier (30), or can engage with the first cam guide portion (300) to restrict the rotation of the carrier (30).

[0081] To this end, the first guide portion (500) is formed to correspond to the first cam guide portion (300). The first guide portion (500) includes a first inclined surface (502) that guides the rotation of the carrier (30) and a first stepped portion (504) that limits the rotation of the carrier (30).

[0082] The second guide portion (510) is formed on the edge of the surface facing the ring gear (40). The second guide portion (510) can be pushed in the direction of the carrier (30) by the second cam guide portion (400) of the ring gear (40), or can engage with the second cam guide portion (400) to restrict the rotation of the ring gear (40).

[0083] To this end, the second guide portion (510) is formed to correspond to the second cam guide portion (400). The second guide portion (510) includes a first inclined surface (512) that guides the rotation of the ring gear (40) and a second stepped portion (514) that limits the rotation of the ring gear (40).

[0084] Meanwhile, the blocker (50) may include a first fixing projection (520) and a second fixing projection (530) so as to fix the carrier (30) and the ring gear (40) respectively during the tilting stroke and sliding stroke.

[0085] The first fixing projection (520) is formed on a surface facing the carrier (30) and is inserted into the fixing hole (310) of the carrier (30) so as to fix the carrier (30). Accordingly, the first fixing projection (520) is inserted into the fixing hole (310) at the start of the tilting stroke so as to fix the carrier (30).

[0086] The second fixing projection (530) is formed on a surface facing the ring gear (40) and is inserted into the fixing groove (410) of the ring gear (40) so as to fix the ring gear (40). Accordingly, the second fixing projection (530) is inserted into the fixing groove (410) at the start of the sliding stroke so as to fix the ring gear (40).

[0088] Meanwhile, the planetary gear device (10) according to the present invention, according to the above-described embodiment, performs a tilting stroke and a sliding stroke, and will be explained in more detail with reference to FIGS. 8 to 14.

[0089] FIG. 8 is a drawing showing the process of unfolding the active air skirt (1) by sequentially performing a tilting stroke and a sliding stroke in the stowed state (or initial state) of the active air skirt (1) according to one embodiment of the present invention, and the process of stowing it by sequentially performing a sliding stroke and a tilting stroke in reverse.

[0090] FIG. 9 is a drawing showing the state of the carrier (30), ring gear (40), and blocker (50) in the initial state (or stowed state) of the active air skirt (1) according to one embodiment of the present invention. FIG. 10 is a drawing showing the state of the carrier (30), ring gear (40), and blocker (50) when a tilting stroke is performed on the outer skirt (2) according to one embodiment of the present invention. FIG. 11 is a drawing showing the state of the carrier (30), ring gear (40), and blocker (50) when a sliding stroke is performed on the inner skirt (3) according to one embodiment of the present invention.

[0091] FIG. 12 is a drawing showing the initial state (or stowed state) of the active air skirt (1), FIG. 13 is a drawing showing the performing of a tilting stroke on the outer skirt (2) of the active air skirt (1), and FIG. 14 is a drawing showing the performing of a sliding stroke on the inner skirt (3) of the active air skirt (1).

[0092] Hereinafter, with reference to FIG. 8, it will be explained how to perform a tilting stroke and a sliding stroke in the stowed state (or initial state) of the active air skirt (1).

[0093] Here, the storage state of the active air skirt (1) means that it is stored in the initial state of the active air skirt as shown in FIG. 12.

[0094] First, the tilting stroke is as follows.

[0095] As illustrated in FIG. 8, when the actuator (8) is driven in the first direction while in the storage state, the sun gear (20) rotates in the same first direction as the actuator (8). Here, the first direction is described as clockwise (CW) in FIG. 8, but is not limited thereto and may be counterclockwise (CCW) or any one of the directions.

[0096] When the sun gear (20) rotates in the first direction, the planetary gear (32) can rotate in the second direction opposite to the first direction. Here, the second direction is described as counterclockwise (CCW) in FIG. 8, but is not limited thereto and may be clockwise (CW) and may mean a direction opposite to the first direction.

[0097] Here, the planetary gear (32) can rotate in the second direction because the carrier (30) is constrained to rotate in the second direction as shown in FIG. 9.

[0098] Specifically, when the active air skirt (1) is in a stowed state, as shown in FIG. 9, the gap (Y) between the first guide portion (500) of the blocker (50) and the first cam guide portion (300) of the carrier (30) is 0 and they are in close contact with each other. In addition, the gap (X) between the second guide portion (510) of the blocker (50) and the second cam guide portion (400) of the ring gear (40) has a predetermined distance (e.g., 3 mm) and they are spaced apart from each other. At this time, the first fixing projection (520) of the blocker (50) is inserted into the fixing hole (310) of the carrier (30), and the second fixing projection (530) of the blocker (50) is not inserted into the fixing groove (410) of the ring gear (40).

[0099] Accordingly, the carrier (30) is fixed by the first guide part (500) and the first cam guide part (300), and the first fixing projection (520) and the fixing hole (310), thereby restricting rotation in the second direction. Additionally, the ring gear (40) is not restricted from rotation in the first direction because the blocker (50) is spaced apart.

[0100] Accordingly, as illustrated in FIG. 10, the ring gear (40) can rotate in a first direction with the internal gear (42) of the ring gear (40) meshing with the planetary gear (32). Here, the ring gear (40) can rotate by an angle of rotation of the tilting stroke, for example, from 0° to 90°.

[0101] In this case, as shown in FIG. 13, the active air skirt (1) can be tilted.

[0102] When the tilting stroke is completed, as shown in FIG. 10, the gap (Y) between the first guide portion (500) of the blocker (50) and the first cam guide portion (300) of the carrier (30) is spaced apart from each other with a predetermined distance (e.g., 1.5 mm). Additionally, the gap (X) between the second guide portion (510) of the blocker (50) and the second cam guide portion (400) of the ring gear (40) is spaced apart from each other with a predetermined distance (e.g., 1.5 mm). At this time, the first fixing projection (520) of the blocker (50) is disengaged from the fixing hole (310) of the carrier (30) so that the fixing of the carrier (30) is released, and the second fixing projection (530) of the blocker (50) is also disengaged from the fixing groove (410) of the ring gear (40).

[0103] At this time, the ring gear (40) is stopped as the idler pin (44) engages with the second guide slot (52) of the blocker (50). Accordingly, the ring gear (40) is fixed and its rotation in the first direction is restricted by the blocker (50).

[0104] With the first direction of rotation of the ring gear (40) restricted, the sliding stroke is as follows.

[0105] First, as shown in FIG. 10, the planetary gear (32) can revolve because the rotation of the ring gear (40) is constrained. Accordingly, the carrier (30) can rotate in a second direction by an angle of rotation of the sliding stroke, for example, from 0° to 60°. In this case, as shown in FIG. 14, the inner skirt of the active air skirt (1) can be slid and unfolded.

[0106] When the sliding stroke is completed, as shown in FIG. 11, the gap (Y) between the first guide portion (500) of the blocker (50) and the first cam guide portion (300) of the carrier (30) has a predetermined distance (e.g., 3 mm) and is spaced apart from each other. In addition, the gap (X) between the second guide portion (510) of the blocker (50) and the second cam guide portion (400) of the ring gear (40) is 0 and is in close contact with each other. At this time, the first fixing projection (520) of the blocker (50) is detached from the fixing hole (310) of the carrier (30), and the second fixing projection (530) of the blocker (50) is inserted into the fixing groove (410) of the ring gear (40) and fixed. Accordingly, the rotation of the carrier (30) is not constrained, and the rotation of the ring gear (40) is constrained.

[0107] At this time, the carrier (30) is stopped as the first guide slot (36) of the carrier (30) engages with the idler pin (44) of the ring gear (40). Accordingly, the carrier (30) is restricted from rotating in the second direction. However, since the carrier (30) is separated from the blocker (50), it can perform rotation in the first direction. This is to allow the sliding stroke and tilting stroke to proceed in reverse order.

[0108] In this way, a tilting stroke and a sliding stroke can be performed through the planetary gear device (10) according to the present invention while the active air skirt is in a retracted state. In addition, if the above-described sequence is performed in reverse, the active air skirt can be retracted through a sliding stroke and a tilting stroke.

[0109] Those skilled in the art to which the present invention pertains will understand that the above-described invention may be implemented in other specific forms without altering its technical concept or essential features.

[0110] Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention. Explanation of the symbols

[0112] 1: Active Air Skirt 2: Outer skirt 3: Inner skirt 5: 1st link section 6: Second link section 8: Actuator 10: Multi-motion planetary gear system 11: Housing 15: Housing cover 20: Sun Gear 30: Carrier 40: Ring gear 50: Blocker

Claims

Claim 1 A multi-motion planetary gear device characterized by comprising: a sun gear connected to the shaft of an actuator; a carrier having at least one planetary gear arranged along the circumferential direction around the sun gear and meshing with the sun gear; a ring gear having an internal gear on its inner surface that meshes with the planetary gear; and a blocker disposed between the ring gear and the carrier and sliding axially according to a first motion stroke and a second motion stroke to restrain the rotation of either the ring gear or the carrier. Claim 2 A multi-motion planetary gear device according to claim 1, wherein the blocker slides in the direction of the carrier during the first motion stroke to fix the carrier, and slides in the direction of the ring gear during the second motion stroke to fix the ring gear. Claim 3 A multi-motion planetary gear device according to claim 1, wherein the blocker comprises: a first elastic member supporting the blocker in the direction of the ring gear; and a second elastic member supporting the blocker in the direction of the carrier. Claim 4 A multi-motion planetary gear device according to claim 1, wherein the blocker comprises: a first guide portion formed on the edge of a surface facing the carrier and restricting the rotation of the carrier; and a second guide portion formed on the edge of a surface facing the ring gear and restricting the rotation of the ring gear. Claim 5 A multi-motion planetary gear device according to claim 4, wherein the first guide portion comprises a first inclined surface that induces rotation of the carrier and a first stepped portion that limits rotation of the carrier, and the second guide portion comprises a second inclined surface that induces rotation of the ring gear and a second stepped portion that limits rotation of the ring gear. Claim 6 A multi-motion planetary gear device according to claim 1, wherein the carrier comprises a first cam guide portion formed on the edge of a surface opposite to the blocker and sliding the blocker in the direction of the ring gear. Claim 7 A multi-motion planetary gear device according to claim 1, wherein the ring gear is formed at the edge of a surface opposite to the blocker and includes a second cam guide portion that slides the blocker in the direction of the carrier. Claim 8 A multi-motion planetary gear device according to claim 1, characterized in that the ring gear includes a first link portion that tilts an active air skirt. Claim 9 A multi-motion planetary gear device according to claim 1, wherein the carrier has a first guide slot formed along the circumferential direction, the blocker has a second guide slot formed along the circumferential direction, and the ring gear has an idler pin formed that is inserted into the first guide slot and the second guide slot. Claim 10 A multi-motion planetary gear device according to claim 9, wherein the second guide slot is formed by the rotation angle of the first motion stroke, and the first guide slot is formed to be longer than the second guide slot by the rotation angle of the second motion stroke. Claim 11 A multi-motion planetary gear device according to claim 9, wherein the carrier comprises a first gear protruding in a ring shape and further comprises a second gear disposed on the idle pin and meshing with the first gear. Claim 12 A multi-motion planetary gear device according to claim 11, wherein the second gear comprises a link connecting portion connected to a second link portion that slides the inner skirt of the active air skirt.

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