Seat moving device for vehicle

Abstract

A vehicle seat moving device includes: a lead screw with an external thread formed on its outer peripheral surface and arranged along the front-rear direction of the vehicle at the lower part of the bottom surface of the vehicle's interior space; a drive motor; a worm gear driven to rotate by the drive motor; a worm wheel meshing with and rotating with the worm gear; a transmission gear rotating integrally with the worm wheel; a power transmission belt meshing with the spur gear of the transmission gear and formed in a closed curve shape; a moving wheel with an internal thread formed on its inner peripheral surface that meshes with the external thread, and driven to rotate and move along the lead screw by meshing with the power transmission belt at an outer gear portion on its outer peripheral surface; and a gearbox having an internally formed receiving space for accommodating the worm gear, the worm wheel, the power transmission belt, and the moving wheel, with a portion disposed at the lower part of the bottom surface and another portion disposed at the upper part exposed to the bottom surface.

Description

Technical Field

[0001] This disclosure relates to a vehicle seat moving device, and more specifically, to a vehicle seat moving device that achieves a clean appearance by not exposing part of the guide screw and gearbox that guide the movement of the vehicle seat to the outside, and improves the efficiency of drive force transmission. Background Technology

[0002] Typically, a car interior is equipped with seats for passengers, including the driver's seat, and these seats are designed to be movable in the fore-and-aft direction according to the physical condition or driving habits of the driver or passenger.

[0003] As disclosed in Korean Patent Publication No. 10-1407145, which was applied for and granted by the applicant, a vehicle seat moving device has been used in recent years to move a seat in the front-to-back direction by using a drive source such as electricity, hydraulic pressure, or air pressure and by a simple operation of a switch.

[0004] like Figures 1 to 3 As shown, the vehicle seat moving device 9 is a device that uses the electric power of a drive motor 91 to move the car seat 10 in the front-back direction. It includes: a lead screw 94 arranged along the front-back movement direction of the seat 10; a rotating shaft 92 driven to rotate by the drive motor 91; and a gearbox 93 connected to the rotating shaft 92 to receive the rotational driving force and move along the lead screw 94.

[0005] Inside the gearbox 93, there is a worm 931 and a worm wheel 932. The worm 931 meshes with and rotates with the end 92a of the rotating shaft 92. The worm wheel 932 meshes with and rotates with the worm 931, and its inner circumferential surface meshes with the lead screw 94, thereby moving back and forth along the lead screw 94 by rotating in both directions.

[0006] Additionally, the end 94a of the guide screw 94 is fixedly mounted on the fixed frame 40, which is fixed to the vehicle body. Furthermore, the seat frame 50, which is fixed to the seat, is fixed to the gearbox 93.

[0007] Therefore, when the drive motor 91 rotates in the forward or reverse direction, the rotational driving force is transmitted to the rotating shaft 92, the worm 931 and the worm wheel 932, causing the worm wheel 932 to move forward or backward together with the gearbox 93 and the seat frame 50 on the lead screw 94, thereby moving the seat 10.

[0008] However, the seat moving device 9 constructed as described above is completely exposed to the vehicle's interior space, making it difficult to ensure operational reliability over extended periods. Furthermore, the user cannot fully utilize the space under the seat, and the minimum height Hs of the seat 10 needs to be limited due to the height of the fixing frame 40 and the guide screw 94.

[0009] Therefore, it is necessary to minimize the height occupied by the vehicle seat moving device in the vehicle's interior space to provide users with a comfortable vehicle interior space and to minimize the inflow of foreign objects such as dust into the vehicle seat moving device to ensure the long-term operational reliability of the seat moving device.

[0010] The seat moving device 9 constructed as described above is only used for comparison with this device and is not a description of a construction known prior to the filing date of this disclosure. Summary of the Invention

[0011] (a) Technical problems to be solved

[0012] The purpose of this disclosure is to utilize a more spacious interior space of a vehicle by lowering the installation height of a vehicle seat moving device that moves the seat in the fore-and-aft direction.

[0013] The purpose of this disclosure is to minimize the width of the slit hole formed through the bottom surface of the vehicle's interior space, corresponding to the movement path of the gearbox.

[0014] The purpose of this disclosure is to minimize the amount of foreign matter such as dust that flows in through the slit orifice, thereby improving the operational reliability of the seat moving device.

[0015] At the same time, the purpose of this disclosure is to further improve the power transmission efficiency within the gearbox.

[0016] (II) Technical Solution

[0017] To achieve the above objectives, this disclosure provides a vehicle seat moving device, characterized in that it includes: a lead screw with an external thread formed on its outer peripheral surface and arranged along the front-rear direction of the vehicle at the lower part of the bottom surface of the vehicle's interior space; a drive motor; a worm gear driven to rotate by the drive motor; a worm wheel meshing with the worm gear and rotating integrally with the worm wheel; a power transmission belt meshing with the spur gear of the power transmission belt and formed in a closed curve shape; a moving wheel with an internal thread formed on its inner peripheral surface that meshes with the external thread, and driven to rotate and move along the lead screw by meshing with the power transmission belt at an outer gear portion on its outer peripheral surface; and a gearbox having an internally formed receiving space for accommodating the worm gear, the worm wheel, the power transmission belt, and the moving wheel, and a portion of which is disposed at the lower part of the bottom surface, and another portion of which is disposed at the upper part of the bottom surface, wherein a portion of the gearbox is exposed through a slit formed on the bottom surface.

[0018] The purpose is to configure a guide screw that serves as a path for moving the seat in the lower part of the vehicle's interior space, and to expose only a portion of the gearbox that moves along the guide screw with the seat in the upper part of the bottom surface. This not only allows the guide screw to be concealed from the outside to improve the user's utilization of the space under the seat, but also reduces the seat's installation height and improves operational reliability throughout its entire life cycle by significantly reducing the amount of foreign matter flowing into the slit orifice.

[0019] The worm gear and the transmission gear can be formed as a single, integrally molded transmission gear body. This allows for a smaller internal space within the gearbox while reducing the number of components, thus enabling power transmission in a compact structure.

[0020] In addition, the transmission gear body has a protrusion at the center of rotation that protrudes along the axial direction, instead of a separate through shaft, and the protrusion is configured to be rotatable by a bushing provided in the gearbox, thereby accurately maintaining the position of the rotating shaft inside the gearbox while reducing the number of parts.

[0021] Except for the slit orifice, the guide screw can be sealed. Therefore, foreign matter will not flow into the guide screw except through the slit orifice, thus more effectively preventing contamination caused by foreign matter.

[0022] The worm gear, which is spaced apart and arranged parallel to each other, and moves together with the moving wheels arranged on the two columns of the lead screws, can be configured to receive rotational driving force from a transmission shaft that is rotated by the drive motor.

[0023] In particular, the width of the gearbox in the passage area through the slit orifice is formed to be thinner compared to the width of the upper and lower sides of the gearbox. Therefore, by minimizing the width of the slit orifice, the amount of foreign matter flowing into the lead screw can be reduced.

[0024] Furthermore, the power transmission belt has a recessed portion in the middle region between the transmission gear and the moving wheel. This not only allows for a smaller slit width, but also, due to the increased engagement angle between the power transmission belt and the transmission gear and moving wheel, enables the transmission of rotational driving force with minimal power loss, thereby improving energy efficiency.

[0025] For this purpose, preferably, the gearbox protrudes inward in the passage area to guide the recessed portion that forms the power transmission belt.

[0026] The term "front-to-back direction" and similar terms used in this specification and claims are defined as referring to the direction of movement of the seat.

[0027] The term "upper side" and similar terms used in this specification and claims are defined as the direction from the bottom surface toward the seat.

[0028] In this specification and claims, "front" and similar terms are defined as the direction from the drive motor toward the gearbox.

[0029] The term "inner side" and similar terms used in this specification and claims are defined as referring to the direction toward the center between the segmented housings forming the gearbox.

[0030] The term “width” and similar terms used in this specification and claims are defined as referring to the length direction of the torque transmission shaft 120.

[0031] (III) Beneficial Effects

[0032] As described above, according to this disclosure, a vehicle seat moving device is provided, wherein the device is configured to provide a guide screw that serves as a path for moving the seat in the lower part of the bottom surface of the vehicle's interior space, and only a portion of the gearbox that moves along the guide screw with the seat is exposed in the upper part of the bottom surface, thereby not only concealing the guide screw from the outside to improve the user's utilization of the space under the seat, but also expanding the height adjustment range of the seat by lowering the seat's setting height.

[0033] In other words, in this disclosure, a guide screw is provided at the bottom of the vehicle's interior space, and only a portion of the gearbox that moves along the guide screw is exposed above the bottom surface and moves, thereby achieving the advantageous effect of utilizing the spacious interior space of the vehicle by lowering the installation height of the seat moving device.

[0034] In particular, in this disclosure, a slit hole corresponding to the movement path of the gearbox is formed on the bottom surface of the vehicle's interior space, and the width of the gearbox is made smaller in the passage area through which the gearbox passes, so that the width of the slit hole is made smaller, thereby minimizing the amount of foreign matter such as dust flowing in through the slit hole, which can have the beneficial effect of improving the operational reliability of the seat moving device.

[0035] In addition, in this disclosure, the outer width of the gearbox is small in the passage area through which the gearbox passes, and an inwardly protruding protrusion is provided inside the gearbox in the passage area to form the width of the power transmission belt connecting the moving wheel and the transmission gear into a concave shape, thereby further increasing the area of ​​the power transmission belt covering the moving wheel and the transmission gear, and transmitting the rotational driving force with higher transmission efficiency, thereby achieving the beneficial effect of improving energy efficiency. Attached Figure Description

[0036] The above and other objects, features and advantages of this device will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0037] Figure 1 This is a perspective view showing the structure of a vehicle seat moving device mounted on a seat.

[0038] Figure 2 It is shown Figure 1 A perspective view of the structure of a vehicle seat moving device.

[0039] Figure 3 yes Figure 2 The longitudinal section view of part "A".

[0040] Figure 4 This is a perspective view showing one side portion of the construction of a vehicle seat moving device according to one embodiment of the present device.

[0041] Figure 5 yes Figure 4 An exploded perspective view of the gearbox.

[0042] Figure 6 It is shown Figure 4 A three-dimensional view of the internal assembly of the gearbox with a portion removed.

[0043] Figure 7 It is used for explanation Figure 4A perspective 3D diagram illustrating the operating principle of a gearbox.

[0044] Figure 8 yes Figure 7 Side perspective view.

[0045] Figure 9 yes Figure 7 Front perspective view.

[0046] Figure 10 This is a perspective view showing the lead screw section on one side, excluding the drive motor.

[0047] Figure 11 It is shown Figure 4 A three-dimensional view of the end of the rotating shaft.

[0048] Best practice

[0049] To achieve the above objectives, this device provides a vehicle seat moving device, characterized in that it includes: a lead screw with an external thread formed on its outer peripheral surface and arranged along the front-rear direction of the vehicle at the lower part of the bottom surface of the vehicle's interior space; a drive motor; a worm gear driven to rotate by the drive motor; a worm wheel that meshes with and rotates with the worm gear; a transmission gear that rotates integrally with the worm wheel; a power transmission belt that meshes with the spur gear of the transmission gear and is formed in a closed curve shape; a moving wheel with an internal thread formed on its inner peripheral surface that meshes with the external thread, and driven to rotate and move along the lead screw by meshing with the power transmission belt at an outer gear portion on its outer peripheral surface; and a gearbox that internally forms a receiving space for accommodating the worm gear, the worm wheel, the power transmission belt, and the moving wheel, and a portion of which is disposed at the lower part of the bottom surface, and another portion of which is disposed at the upper part of the bottom surface, wherein a portion of the gearbox is exposed through a slit formed on the bottom surface. Detailed Implementation

[0050] Hereinafter, preferred embodiments of the device will be described in detail with reference to the accompanying drawings, but the invention is not limited or restricted by these embodiments. For reference, the same reference numerals in this specification denote substantially the same components, and under this rule, descriptions may be based on content shown in other drawings, and content that is obvious or repetitive to those skilled in the art may be omitted.

[0051] As shown in the attached figures, the vehicle seat moving device 100 includes: a drive motor 110; a torque transmission shaft 120, which rotates 120r in either the forward or reverse direction via the drive motor 110; a gearbox 130, which is connected to the end of the torque transmission shaft 120 on its upper side, with a lead screw 180 passing through the lower side of the gearbox 130, having an internal receiving space, and connected to the seat 10; a worm gear 140, which is disposed in the upper end space X4 of the receiving space of the gearbox 130 to receive rotational driving force from the torque transmission shaft 120; and a transmission gear body 150, which has a helical gear portion 151 that meshes with the external thread of the worm gear 140. A spur gear 152, coaxially and integrally formed with the helical gear 151, is disposed in the upper side space X5 of the receiving space of the gearbox 130; a moving wheel 170, separated from the transmission gear body 150 to the lower side, is disposed in the lower end space X7 of the gearbox 130; a power transmission belt 160 meshes with the spur gear 152 of the transmission gear body 150 and the outer gear 170a of the moving wheel 170 to transmit rotational driving force in the vertical direction; and a guide screw 180 serves as a path for moving the gearbox 130 and the seat 10 in the front-rear direction by rotating the moving wheel 170.

[0052] The drive motor 110 is driven to rotate by an externally supplied power source, and both sides of the rotor are respectively connected to the torque transmission shaft 120, so that the torque transmission shaft 120 rotates forward and backward by 120r. The drive motor 110 moves in the same direction as the gearbox 130 in the forward and backward direction.

[0053] The torque transmission shaft 120 is formed by winding a thin thread 122 to be able to bend and deform, and the end 120e is compressed to form a non-circular cross section and inserted into the non-circular receiving groove 140i of the worm gear 140.

[0054] Therefore, the rotational driving force of the drive motor 110 is transmitted to the worm 140 while generating a torsional displacement of the torque transmission shaft 120, thereby causing the worm 140 to rotate. At the same time, even if there is a deviation between the travel distance of the gearbox 130 and the travel distance of the drive motor 110, the rotational driving force is smoothly transmitted from the drive motor 110 to the worm 140 because the thin wire 122 allows for bending deformation due to its winding formation.

[0055] like Figure 5 As shown, the gearbox 130 is formed by connecting two segmented housings 130A and 130B with fixing bolts 138 to provide an internal accommodating space. A U-shaped connecting slider 132x can be provided to integrally bind and fix the two segmented housings 130A and 130B to prevent lower separation when the two segmented housings 130A and 130B are connected.

[0056] In the upper end space X4 of the gearbox 130, the worm gear 140 is rotatably accommodated. In the upper side space X5 of the gearbox 130, the transmission gear body 150 is rotatably accommodated in a position perpendicular to the worm gear. In the lower end space X7 of the gearbox 130, the moving wheel 170 is rotatably accommodated parallel to the transmission gear body 150, and the power transmission belt 160 is accommodated, such that the power transmission belt 160 connects the spur gear portion 152 of the transmission gear body 150 and the outer gear portion 170a of the moving wheel 170 in the vertical direction.

[0057] The worm gear 140 is rotatably mounted in the upper end space X4 via bushings 146 on both sides, and accommodates the end 120e of the torque transmission shaft 120 so as to rotate integrally with the rotation 120r of the torque transmission shaft 120.

[0058] The worm gear 140 is rotatably mounted in the upper space X4 of the gearbox 130 under the rotatable support of the bushing 146 at the center of rotation.

[0059] In the transmission gear body 150, a helical gear portion 151 that meshes with a worm gear 140 and a spur gear portion 152 that meshes with a power transmission belt 160 are integrally formed. That is, the helical gear portion 151 forms a worm gear, the spur gear portion 152 forms a transmission gear, and the helical gear portion 151 and the spur gear portion 152 are injection molded into a single body. For example, it can be formed by sequentially injection molding the transmission gear having the spur gear portion 152 after forming the worm gear having the helical gear portion 151.

[0060] Therefore, it is not necessary to set up a separate component to transmit the rotational driving force from the worm gear 151, which has a helical gear section 151 that receives the rotational driving force from the worm 140, to the transmission gear 152, thereby forming a more compact structure.

[0061] Rotational protrusions 155 are formed at the rotational centers of both ends of the transmission gear body 150 in the direction of rotation axis, and the rotational protrusions 155 are rotatably disposed in the upper space X5 of the gearbox 130 via an annular bushing 156.

[0062] The power transmission belt 160 is formed in a closed curve shape and is configured to mesh with the spur gear portion 152 of the transmission gear forming the transmission gear body 150 and the outer gear portion 170a formed on the outer peripheral surface of the moving wheel 170. The spur gear portion 152 and the outer gear portion 170a are formed as gears with equal spacing to mesh with the protrusion 160a formed on the inner surface of the power transmission belt 160.

[0063] The power transmission belt 160 is formed of a flexible material such as rubber or resin, and is configured to cover the spur gear portion 152 of the transmission gear body 150 and the outer gear portion 170a of the moving wheel 170, so as to transmit rotational driving force from the transmission gear body 150 to the moving wheel 170.

[0064] In particular, the power transmission belt 160 is configured to cover the transmission gear and the moving wheel 170 of the transmission gear body 150 at angles ang5 and ang7 of more than 180 degrees, respectively, so as to transmit the rotational driving force from the transmission gear to the power transmission belt 160 without power loss, and at the same time transmit the rotational driving force from the power transmission belt 160 to the moving wheel 170 without power loss, thereby minimizing the load required to transmit the rotational driving force of the drive motor to the moving wheel 170, which helps to minimize power consumption.

[0065] In particular, the power transmission belt 160 can not only smoothly transmit power between the transmission gear body 150 and the moving wheel 170 that are separated vertically within the gearbox 130, but also maintains a constant shape or does not occupy too much space. Therefore, it can achieve the advantage of transmitting rotational driving force in the form of a narrow slit hole 89 with a small width w formed on the bottom surface 88 of the vehicle's interior space IN.

[0066] The movable wheel 170 is rotatably disposed in the lower end space X7 of the gearbox 130 and is configured to be movable along the lead screw 180.

[0067] For this purpose, an internal thread 170b is formed on the inner circumferential surface of the movable wheel 170, which engages with the external thread formed on the outer circumferential surface of the guide screw 180, and is configured to be in a tightened state between the external thread of the guide screw 180 and the internal thread 170b of the movable wheel 170. In addition, an external thread 170a is formed on the outer circumferential surface of the movable wheel 170, and is configured to engage with the power transmission belt 160.

[0068] like Figure 5 As shown, the movable wheel 170 has an extension 170e at its end in the axial direction of the lead screw 180. This extension is inserted into a bushing 176 provided on the gearbox 130 and is rotatably disposed relative to the gearbox 130. Friction-reducing washers 179 are provided on both sides of the outer gear portion 170a in the axial direction to reduce friction with the gearbox 130. The inner diameter of the friction-reducing washer 179 is larger than the outer diameter of the extension 170e. A washer 178 is provided outside the friction-reducing washer 179, and an annular damper 177 is provided between the washer 178 and the bushing 176 to withstand the minute impacts caused by the clearance between the bushing 176 and the movable wheel 170. The annular damper 177 is formed of a compressible material such as rubber and serves to mitigate the minute impacts generated at the moment the movable wheel 170 stops moving in the forward and backward directions.

[0069] like Figure 4 As shown, the outer peripheral surface of the guide screw 180 has an external thread portion that engages with the internal thread portion 170b of the movable wheel 170. The guide screw 180 is disposed on the support surface 87 of the setting space MM between the vehicle's interior space IN and exterior space OUT.

[0070] In a preferred embodiment of this device, the space MM is designed to be closed, ensuring that there is no channel for foreign matter to enter except through the slit hole 89 formed on the bottom surface 88. For this purpose, the guide screw 180 is fixedly mounted on the support surface 87, and this can be achieved by mounting the gearbox 130 to the guide screw 180 and fixing the position of the support surface 87 relative to the bottom surface 88. For example, the support surface 87 can be formed of a robust material that does not deform under external forces and can be part of the vehicle body.

[0071] like Figure 10 As shown, the two ends of the lead screw 180 are supported by support platforms 188 and 189 fixed to the support surface 87.

[0072] The front support platform 189, which is bent at an acute angle ang to the support surface, accommodates and fixes the front part of the guide screw 180. Therefore, even if a force causes the seat 10 to tilt forward 66 due to a sudden accident or other event, and thus generates a torque indicated by the reference numeral M, the bending portion of the front support platform 189 can minimize seat disengagement while protecting passenger safety.

[0073] The rear support platform 188 has a through hole through which the rear of the guide screw 180 passes. With the rear of the guide screw 180 passing through the through hole, the rear of the guide screw 180 is fixed by tightening the fastening nut 186.

[0074] Annular end dampers 182 are provided at both ends of the lead screw 180. The end dampers are formed of soft rubber material to absorb shocks. Therefore, even if the vehicle seat 10 stops suddenly at the front or rear of its travel, the end dampers 182 can absorb the stopping impact of the seat, thereby providing passengers with the advantages of seat movement comfort and stability.

[0075] On the other hand, such as Figure 4 As shown, a thin and elongated slit hole 89 is formed on the bottom surface 88 of the vehicle interior space IN, and the gearbox 130 is arranged to pass through the slit hole 89. Therefore, as... Figure 8 As shown, the outer surface of the gearbox 130 is formed such that the width gradually decreases from the upper side toward the passage area A6, and after passing the boundary 135 of the passage area A6, the width gradually increases toward the lower side.

[0076] That is, the outer width x of the gearbox 130 in the passage area A6 through the slit hole 89 is smaller than the width y of the upper and lower sides of the gearbox 130, making the overall width w of the slit hole 89 smaller. As a result, the amount of foreign matter flowing in through the slit hole 89 in the installation space MM of the guide screw 180 located below the bottom surface 88 is very small, thereby significantly reducing the possibility of increased load or malfunction due to contamination of the guide screw.

[0077] Because the outer width x in the passage area A6 of the gearbox 130 is relatively smaller, the width direction spacing in the passage area A6 of the internal accommodating space of the gearbox 130 is also smaller compared to the width direction spacing of its upper and lower sides. That is, the segmented housings 130A and 130B facing each other in the gearbox 130 are joined to form an internal accommodating space, and the spacing between the inner wall surfaces of the segmented housings 130A and 130B in the accommodating portion of the power transmission belt 160 in the gearbox 130 is formed to be the smallest in the passage area A6.

[0078] For example, such as Figure 5 As shown, the inner wall surface 135i of the segmented housing 130A forming the gearbox 130 can be inclined such that the width gradually decreases from the upper side to the passage area and gradually increases from the passage area to the lower side, so that the width corresponding to the passage area is minimized. Furthermore, an inwardly protruding protrusion 139 is formed on the inner wall surface of the gearbox 130 in the passage area A6. As described above, since the internal shape of the gearbox 130 is formed to have the narrowest width direction gap in the passage area A6, the power transmission belt 160, which connects the transmission gear and the moving wheel 170 in a closed curve shape, is guided by the inner wall surface or the protrusion 139 in the passage area A6 to form a recessed portion, and the recessed portion in the passage area A6 will form the minimum width xx of the power transmission belt 160. For example, the width xx of the power transmission belt 160 in the passage area A6 is formed to be less than or equal to 1 / 2 of the diameter of the transmission gear or the moving wheel 170.

[0079] As described above, since the power transmission belt 160 is formed to have a minimum width xx in the passage area A6, the contact angle ang5 of the spur gear portion 152 of the power transmission belt 160 covering the transmission gear body 150 and the contact angle ang7 of the outer gear portion 170a of the moving wheel 170 will exceed 180 degrees and make contact at a large angle of approximately 220 degrees to 260 degrees. This improves the transmission efficiency of the rotational driving force transmitted through the power transmission belt 160 and reduces the load on the drive motor. Therefore, it is possible to obtain the advantage of moving the seat by consuming a small amount of battery.

[0080] like Figure 7As shown, in a vehicle seat moving device 100 constructed as described above according to an embodiment of the present device, when the drive motor 110 rotates the torque transmission shaft 120 in a first direction, causing the worm gear 140, which rotates together with the torque transmission shaft 120, to rotate R1 in the first direction, the transmission gear body 150, having a helical gear portion 151 meshing with the worm gear 140, rotates R2 in the second direction, and the power transmission belt 160, which covers the transmission gear body 150 and the moving wheel 170 in a closed curve shape, rotates in an infinite loop in the direction marked R3. Simultaneously, the moving wheel 170 rotates R4 in the same second direction as the transmission gear body 150 via the power transmission belt 160. Since the moving wheel 170 is in a state where the internal thread portion 170b of its inner circumferential surface meshes with the external thread portion of the lead screw 180, the rotation of the moving wheel 170 in the second direction causes the gearbox 130 to move forward d1. Since the gearbox 130 is engaged with the seat 10, the seat 10 also moves forward together.

[0081] Conversely, when the drive motor 110 rotates the torque transmission shaft 120 in a direction opposite to the first direction, causing the worm 140, which rotates with the torque transmission shaft 120, to rotate in the opposite direction of the first direction (reverse of R1), the transmission gear body 150, having a helical gear portion 151 meshing with the worm 140, rotates in the opposite direction of the second direction (reverse of R2). The power transmission belt 160, which encloses the transmission gear body 150 and the moving wheel 170 in a closed curve shape, rotates in an infinite loop in the opposite direction of the direction marked R3. Simultaneously, the moving wheel 170 rotates via the power transmission belt 160 in the opposite direction of the second direction (reverse of R4), the same as the transmission gear body 150. Since the moving wheel 170 is in a state where the internal thread portion 170b on its inner circumferential surface meshes with the external thread of the lead screw 180, the rotation of the moving wheel 170 in the opposite direction of the second direction causes the gearbox 130 to move backward. Since the gearbox 130 is engaged with the seat 10, the seat 10 also moves backward.

[0082] The vehicle seat moving device 100 constructed as described above according to one embodiment of the present device is configured such that a guide screw 180 serving as a path for moving the seat is provided on the lower part of the bottom surface 88 of the vehicle's interior space IN, and only the upper part of the gearbox 130, which moves along the guide screw 180 with the seat 10, is exposed on the upper part of the bottom surface 88. Therefore, the guide screw 180, which is easily contaminated by foreign objects, is concealed from the outside, and the surface of the guide screw 180 is kept clean for a long time, thereby achieving the advantageous effect of ensuring the operational reliability of the seat moving device.

[0083] Furthermore, by arranging the existing guide screw 180, which is located in the interior space of the vehicle, outside the interior space IN, not only can the space utilization rate under the seat 10 of the vehicle be improved, but the minimum height of the seat can also be further reduced, thereby providing the advantage of a wider range of seat height adjustment.

[0084] In particular, since the width x of the passage area A6 corresponding to the position of the slit hole 89 through which the gearbox 130 passes is formed to be relatively small, the width w of the slit hole 89 can be formed to be very narrow. Therefore, not only can the amount of foreign matter such as dust flowing in through the slit hole be minimized, but the width xx of the middle part of the power transmission belt 160 can also be formed to be relatively small, so that the contact angle with the transmission gear body 150 and the contact angle with the moving wheel 170 can be formed to be larger. This can result in the beneficial effects of improving the transmission efficiency of the rotational driving force and reducing the load on the motor.

[0085] As described above, the preferred embodiments of the device have been explained, but those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A vehicle seat moving device, characterized in that, include: The lead screw has an external thread formed on its outer peripheral surface and is arranged along the front-rear direction of the vehicle at the bottom of the vehicle's interior space. Drive motor; The torque transmission shaft rotates via the drive motor; The worm gear is driven to rotate via the torque transmission shaft; The transmission gear body meshes with and rotates with the worm gear; A power transmission belt meshes with the transmission gear body; The movable wheel has an internal thread formed on its inner circumferential surface that meshes with the external thread, and is driven to rotate and move along the lead screw via the power transmission belt. The transmission gear body includes a worm wheel that meshes and rotates with the worm and a transmission gear that meshes with the power transmission belt. The power transmission belt is formed such that the contact angle of the outer gear portion of the worm gear covering the transmission gear body and the moving wheel exceeds 180 degrees. The vehicle seat moving device further includes: a gearbox forming an internal receiving space, the receiving space accommodating the worm gear, the transmission gear body, the power transmission belt, and the moving wheel. A portion of the gearbox is disposed on the lower part of the bottom surface, and another portion of the gearbox is exposed on the upper part of the bottom surface. Another part of the gearbox is exposed through a slit formed on the bottom surface.

2. The vehicle seat moving device according to claim 1, characterized in that, The movable wheel includes an outer gear portion that meshes with the power transmission belt, and the outer gear portion meshes with a protrusion formed on the inner surface of the power transmission belt.

3. The vehicle seat moving device according to claim 1, characterized in that, The transmission gear body includes a rotating protrusion formed at the center of rotation, the rotating protrusion being rotated by a bushing in the gearbox.

4. The vehicle seat moving device according to claim 1, characterized in that, The movable wheel is rotatably mounted inside the gearbox via bushings. An annular damper is provided between the bushing and the outer gear section.

5. The vehicle seat moving device according to claim 1, characterized in that, An annular end damper is provided at the end of the lead screw.

6. The vehicle seat moving device according to claim 1, characterized in that, The gearbox includes a passage area extending through the slit orifice, the outer width of which is formed to be smaller compared to the upper and lower sides of the gearbox.

7. The vehicle seat moving device according to claim 6, characterized in that, The gearbox includes segmented housings facing each other, the segmented housings being joined to form the receiving space inside, and the spacing between the inner wall surfaces of the segmented housings in the receiving portion that receives the power transmission belt is minimized in the passage area within the gearbox.

8. The vehicle seat moving device according to claim 7, characterized in that, The power transmission belt connects the transmission gear body and the moving wheel in a closed curve shape, and includes a recessed portion formed by a protrusion projecting inward on the inner wall surface in the passage area.

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