Speed reduction device for electric vehicle

Abstract

Provided by the present invention is a speed reduction device for an electric vehicle, the device comprising: a driving motor; a first planetary gear set, power-connected to the driving motor; a second planetary gear set provided so as to be spaced apart from the the first planetary gear set whilst being power-connected to the driving motor; and a sleeve which connects a first carrier of the first planetary gear set and a second carrier of the second planetary gear set, or the first carrier of the first planetary gear set and a second ring gear of the second planetary gear set, or the second carrier of the second planetary gear set and the second ring gear of the second planetary gear set.

Description

Reduction device for electric vehicles

[0001] The present invention relates to a reduction device for an electric vehicle.

[0002] To comply with exhaust gas regulations and reduce fossil fuel use, demand for electric vehicles (fuel cell vehicles, hydrogen vehicles) is increasing in commercial vehicles such as trucks and buses for freight transport.

[0003] Electric vehicles don't require the complex transmissions found in internal combustion engine vehicles. This is because the power of the electric motor reaches its peak immediately upon starting, sufficiently moving the heavy vehicle body without a transmission.

[0004] Because electric vehicles do not require the maximum power of the drive motor at startup or low speeds, they can use a reduction gear instead of a transmission to generate the necessary power.

[0005] A reduction gear of a conventional electric vehicle may include at least one planetary gear set that transmits power from a drive motor. The planetary gear set may include a sun gear that is connected to the drive motor and power, a plurality of planetary gears that mesh with an outer diameter of the sun gear so as to be externally connected to the sun gear and are formed along the circumference of the sun gear, a connecting portion that is connected to a central axis of the planetary gear to enable rotation of the planetary gear, and a carrier that has a central axis that rotates together with the planetary gears that are connected to the connecting portion and revolve along the circumference of the sun gear, and a ring gear in which the planetary gears mesh with an inner diameter of the plurality of planetary gears so as to be externally connected. The power of the drive motor may be transmitted to a final drive wheel via the planetary gear set.

[0006] However, conventional electric vehicles typically utilize single-stage reduction gears for practicality, but these gears have struggled to meet the performance requirements of electric vehicles. Furthermore, electric vehicles equipped with single-stage reduction gears require high-performance drive motors, which are disadvantageous due to space constraints and cost.

[0007] [Prior Art Literature]

[0008] [Patent Document]

[0009] (Patent Document 1) Republic of Korea Patent Publication No. 10-2012-0036696 (Published on April 18, 2012)

[0010] In order to solve the above-mentioned problem, the present invention provides a reduction device for an electric vehicle that enables multi-stage reduction by allowing the power of a driving motor to pass through a plurality of planetary gear sets.

[0011] In order to achieve the above-mentioned object, the present invention provides a reduction device for an electric vehicle, comprising: a driving motor; a first planetary gear set that is connected to the driving motor for power; a second planetary gear set that is connected to the driving motor for power and is provided at a distance from the first planetary gear set; and a sleeve that connects a first carrier of the first planetary gear set to a second carrier of the second planetary gear set, or connects a first carrier of the first planetary gear set to a second ring gear of the second planetary gear set, or connects a second carrier of the second planetary gear set to a second ring gear of the second planetary gear set.

[0012] In addition, the first planetary gear set may include a first sun gear connected to the drive shaft of the drive motor; a first planetary gear provided around the first sun gear and meshed with an outer diameter of the first sun gear and connected to the first carrier; and a first ring gear fixedly configured while the first planetary gear meshes with an inner diameter; and the second planetary gear set may include a second sun gear connected to the drive shaft of the drive motor; a second planetary gear provided around the second sun gear and meshed with an outer diameter of the second sun gear and connected to the second carrier; and a second ring gear having the second planetary gear meshed with an inner diameter.

[0013] Additionally, the sleeve may include a first engagement portion provided on one side of the inner diameter; and a second engagement portion provided on the other side of the inner diameter.

[0014] In addition, the sleeve may move in the axial direction at the first speed so that the first engagement portion is simultaneously engaged with the outer diameter of the first carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second carrier, move in the axial direction at the second speed so that the first engagement portion is simultaneously engaged with the outer diameter of the first carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second ring gear, and move in the axial direction at the third speed so that the first engagement portion is simultaneously engaged with the outer diameter of the second carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second ring gear.

[0015] In addition, it may include a third planetary gear set that is provided at a distance from the second planetary gear set and is connected to the second planetary gear set by power; and an intershaft that penetrates the inside of the driving motor and transmits the power of the third planetary gear set to one driving wheel.

[0016] In addition, the third planetary gear set includes a third sun gear that is connected to the central axis of the second carrier and is powered; a third planetary gear that is provided around the third sun gear and is connected to the third carrier and is powered while meshing with an outer diameter portion of the third sun gear; and a third ring gear that is connected to an inner diameter portion of the third planetary gear; and the central axis of the third carrier can be connected to the intershaft.

[0017] In addition, the third planetary gear set is connected to the fourth planetary gear set for power, and the fourth planetary gear set is provided along the circumference of the third ring gear, and includes a fourth planetary gear that is connected to the fourth carrier while meshing with the outer diameter of the third ring gear; and a fourth ring gear in which the fourth planetary gear is meshed with the inner diameter; and the fourth carrier is fixedly configured, and the central axis of the fourth ring gear can be connected to an axle shaft that transmits power to the other driving wheel.

[0018] In addition, a third planetary gear set is provided at a distance from the second planetary gear set, and the third planetary gear set includes a third sun gear that is connected to the central axis of the second carrier by power; a third planetary gear that is provided around the third sun gear and is connected to the third carrier by power while engaging with an outer diameter portion of the third sun gear; and a third ring gear that is fixedly configured while engaging with the third planetary gear at an inner diameter portion; and the third carrier can be connected to a differential device by power.

[0019] In addition, the differential device includes a side gear on one side and a side gear on the other side provided on both sides of the pinion gear, the side gear on the one side is connected to an intershaft that transmits power to the driving wheel on the one side, the intershaft penetrates the inside of the driving motor and is connected to the side gear on the one side, and the side gear on the other side can be connected to an axle shaft that transmits power to the driving wheel on the other side.

[0020] Additionally, the central axis of the second carrier can be connected to an axle device that transmits power to both driving wheels.

[0021] The present invention can achieve multi-stage reduction by having the power of the driving motor pass through a plurality of planetary gear sets.

[0022] In addition, the present invention can be used in various types of electric vehicle drive units, such as a central motor or an E-Axle.

[0023] FIG. 1 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a first embodiment of the present invention.

[0024] FIG. 2 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a second embodiment of the present invention.

[0025] FIG. 3 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a third embodiment of the present invention.

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. First, when assigning reference numerals to components in each drawing, it should be noted that identical components are assigned the same numerals as much as possible even if they are shown in different drawings. Furthermore, in describing the present invention, if a detailed description of a related known structure or function is judged to obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, although preferred embodiments of the present invention will be described below, it should be understood that the technical idea of ​​the present invention is not limited thereto and can be modified and implemented in various ways by those skilled in the art.

[0027] FIG. 1 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a first embodiment of the present invention.

[0028] As illustrated in FIG. 1, the first embodiment of the present invention may include a drive motor (1), a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and a sleeve (5) having a first engagement portion (5a) and a second engagement portion (5b) on both sides of an inner diameter.

[0029] The first planetary gear set may include a first sun gear (11), a first planetary gear (12), a first carrier (13), and a first ring gear (14).

[0030] The drive shaft (1a) of the drive motor (1) can be simultaneously connected to the centers of the first sun gear (11) and the second sun gear (21). The power generated from the drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21) through the drive shaft (1a).

[0031] The first planetary gear (12) can be meshed with the outer diameter of the first sun gear (11) so as to be external to the first sun gear (11). The first planetary gear (12) can be configured in multiple numbers along the circumference of the first sun gear (11).

[0032] The first planetary gear (12) can be connected to the first carrier (13). For example, the first carrier (13) can be configured so that the outer diameter (131) can mesh with the first engagement portion (5a) of the sleeve (5) while being connected to the central axis of the first planetary gear (12).

[0033] The first ring gear (14) can be meshed with the first planetary gear (12) on the inner diameter so as to be external to the first planetary gear (12). The first ring gear (14) can be configured to be fixed (F).

[0034] The second planetary gear set may include a second sun gear (21), a second planetary gear (22), a second carrier (23), and a second ring gear (24).

[0035] The second sun gear (21) can be provided at a distance from the first sun gear (11).

[0036] The second planetary gear (22) can be meshed with the outer diameter of the second sun gear (21) so as to be external to the second sun gear (21). The second planetary gear (22) can be configured in multiple numbers along the circumference of the second sun gear (21).

[0037] The second planetary gear (22) can be connected to the second carrier (23).

[0038] For example, the second carrier (23) may be configured with a connecting portion (233) that is connected to the central axis (222) of the second planetary gear (22) to enable rotation of the second planetary gear (22), and a central axis (232) that is connected to the center of the third sun gear (31) while being connected to the connecting portion (233).

[0039] For example, the outer diameter (231) of the second carrier (23) can be configured to be engageable with the first engagement portion (5a) or the second engagement portion (5b) of the sleeve (5).

[0040] In Fig. 1, the connecting portion (233) of the second carrier (23) is illustrated as being formed radially from the central axis (232), but this is by no means limited to this, and for example, the connecting portion (233) may be formed in various shapes such as a circle.

[0041] In Fig. 1, the connecting portion (233) of the second carrier (23) is illustrated as being formed radially from the central axis (232), but this is by no means limited to this, and for example, the connecting portion (233) may be formed in various shapes such as a circle.

[0042] The second ring gear (24) can be meshed with the second planetary gear (22) on the inner diameter so that it is external to the second planetary gear (22).

[0043] The sleeve (5) can move axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter (231) of the second carrier (23). The sleeve (5) can move axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter (241) of the second ring gear (24). The sleeve (5) can move axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter (231) of the second carrier (23) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter (241) of the second ring gear (24).

[0044] For example, the sleeve (5) can move in the mating direction by the operation of an actuator (not shown).

[0045] The third planetary gear set may include a third sun gear (31), a third planetary gear (32), a third carrier (33), and a third ring gear (34).

[0046] The third sun gear (31) may be provided at a distance from the second sun gear (21). The center of the third sun gear (31) may be connected to the central axis (232) of the second carrier (23). The power of the second carrier (23) may be transmitted to the third sun gear (31).

[0047] The third planetary gear (32) can be meshed with the outer diameter of the third sun gear (31) so as to be external to the third sun gear (31). The third planetary gear (32) can be configured in multiple numbers along the circumference of the third sun gear (31).

[0048] The third planetary gear (32) can be connected to the third carrier (33). The central axis (332) of the third carrier (33) can be connected to the intershaft (3).

[0049] The intershaft (3) can transmit power to one driving wheel (not shown). The intershaft (3) can pass through the interior of the driving motor (1) and be connected to the central axis (332) of the third carrier (33).

[0050] The third ring gear (34) can be meshed with the third planetary gear (32) on the inner diameter so that it is externally connected to the third planetary gear (32).

[0051] The fourth planetary gear set may include a fourth planetary gear (42), a fourth carrier (43), and a fourth ring gear (44).

[0052] The fourth planetary gear (42) may be meshed with the outer diameter of the third ring gear (34) so ​​as to be external to the third ring gear (34). The fourth planetary gears (42) may be configured in multiple numbers along the circumference of the third ring gear (34). The third ring gear (34) may serve as a sun gear that transmits power to the fourth planetary gear (42).

[0053] The fourth planetary gear (42) can be connected to the fourth carrier (43). The fourth carrier (43) can be configured as fixed (F).

[0054] The fourth ring gear (44) can be meshed with the fourth planetary gear (42) on the inner diameter so that it is externally connected to the fourth planetary gear (42).

[0055] The central axis (442) of the fourth ring gear (44) can be connected to an axle shaft (not shown) for power. For example, the axle shaft (not shown) can transmit power to the other driving wheel (not shown).

[0056] The following describes the power flow during gear shifting of the first embodiment of the present invention.

[0057] As shown in Fig. 1, the sleeve (5) moves axially by the operation of the first speed actuator (not shown), so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23). As a result, the first carrier (13) and the second carrier (23) can be driven as one.

[0058] The power of the first gear drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0059] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0060] Since the first carrier (13) and the second carrier (23) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13).

[0061] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second sun gear (21) can be transmitted to the third sun gear (31) via the second planetary gear (22) and the second carrier (23).

[0062] The power transmitted to the third sun gear (31) can be transmitted to the third planetary gear (32).

[0063] Since the central axis (332) of the third carrier (33) is connected to the intershaft (3) and the central axis (442) of the fourth ring gear (44) is connected to the axle shaft (not shown), the power transmitted to the third planetary gear (32) can be transmitted to the intershaft (3) via the third carrier (33) and at the same time transmitted to the axle shaft (not shown) via the third ring gear (34), the fourth planetary gear (42), and the fourth ring gear (44).

[0064] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0065] Power transmitted to the axle shaft (not shown) can be transmitted to the other drive wheel (not shown).

[0066] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The fourth carrier (43) is configured to be fixed (F) and can serve to support the fourth planetary gear (42) so that the fourth planetary gear (42) can rotate.

[0067] As shown in Fig. 1, by the operation of the second speed actuator (not shown), the sleeve (5) moves axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the first carrier (13) and the second ring gear (24) can be driven as one.

[0068] The power of the second gear drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0069] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0070] Since the first carrier (13) and the second ring gear (24) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second ring gear (24) via the first carrier (13).

[0071] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second sun gear (21) can be transmitted to the third sun gear (31) via the second planetary gear (22) and the second carrier (23).

[0072] The power transmitted to the third sun gear (31) can be transmitted to the third planetary gear (32).

[0073] Since the central axis (332) of the third carrier (33) is connected to the intershaft (3) and the central axis (442) of the fourth ring gear (44) is connected to the axle shaft (not shown), the power transmitted to the third planetary gear (32) can be transmitted to the intershaft (3) via the third carrier (33) and at the same time transmitted to the axle shaft (not shown) via the third ring gear (34), the fourth planetary gear (42), and the fourth ring gear (44).

[0074] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0075] Power transmitted to the axle shaft (not shown) can be transmitted to the other drive wheel (not shown).

[0076] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The fourth carrier (43) is configured to be fixed (F) and can serve to support the fourth planetary gear (42) so that the fourth planetary gear (42) can rotate.

[0077] As shown in Fig. 1, by the operation of the third speed actuator (not shown), the sleeve (5) moves axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the second carrier (23) and the second ring gear (24) can be driven as one unit.

[0078] The power of the third-speed drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0079] The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0080] Since the second carrier (23) and the second ring gear (24) are driven integrally and the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second planetary gear (22) can be transmitted to the third sun gear (31) via the second carrier (23).

[0081] The power transmitted to the third sun gear (31) can be transmitted to the third planetary gear (32).

[0082] Since the central axis (332) of the third carrier (33) is connected to the intershaft (3) and the central axis (442) of the fourth ring gear (44) is connected to the axle shaft (not shown), the power transmitted to the third planetary gear (32) can be transmitted to the intershaft (3) via the third carrier (33) and at the same time transmitted to the axle shaft (not shown) via the third ring gear (34), the fourth planetary gear (42), and the fourth ring gear (44).

[0083] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0084] Power transmitted to the axle shaft (not shown) can be transmitted to the other drive wheel (not shown).

[0085] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The fourth carrier (43) is configured to be fixed (F) and can serve to support the fourth planetary gear (42) so that the fourth planetary gear (42) can rotate.

[0086] FIG. 2 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a second embodiment of the present invention.

[0087] As illustrated in FIG. 2, the second embodiment of the present invention may include a drive motor (1), a first planetary gear set, a second planetary gear set, a third planetary gear set, and a differential device (4).

[0088] The configuration of the drive motor (1), the first planetary gear set, the second planetary gear set, and the sleeve (5) of the second embodiment of the present invention is the same as that of the first embodiment, so a detailed description of the configuration thereof is omitted.

[0089] The third planetary gear set may include a third sun gear (31), a third planetary gear (32), a third carrier (33), and a third ring gear (34).

[0090] The third sun gear (31) may be provided at a distance from the second sun gear (21). The third sun gear (31) may be powered by the central axis (232) of the second carrier (23). The power of the second carrier (23) may be transmitted to the third sun gear (31).

[0091] The third planetary gear (32) can be meshed with the outer diameter of the third sun gear (31) so as to be external to the third sun gear (31). The third planetary gears (32) can be configured in multiple numbers along the circumference of the third sun gear (31). The third planetary gears (32) can be connected to the third carrier (33) for power.

[0092] The third ring gear (34) can be meshed with the third planetary gear (32) on the inner diameter so as to be external to the third planetary gear (32). The third ring gear (34) can be configured as fixed (F). The third carrier (33) can be connected to the differential device (4) for power.

[0093] The differential device (4) may include a pinion gear (4a) that is connected to the third carrier (33) by power, a side gear (4b) on one side that is engaged with both sides of the pinion gear (4a), and a side gear (4c) on the other side.

[0094] One side gear (4b) can be connected to an intershaft (3) that transmits power to one side drive wheel (not shown). The intershaft (3) can be connected to the one side gear (4b) by passing through the drive motor (1).

[0095] The other side gear (4c) can be connected to an axle shaft (2) that transmits power to the other side drive wheel (not shown).

[0096] The following describes the power flow during gear shifting in the second embodiment of the present invention.

[0097] As shown in Fig. 2, the sleeve (5) moves axially by the operation of the first speed actuator (not shown), so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23). As a result, the first carrier (13) and the second carrier (23) can be driven as one.

[0098] The power of the first gear drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0099] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0100] Since the first carrier (13) and the second carrier (23) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13).

[0101] The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0102] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second planetary gear (22) can be transmitted to the third sun gear (31) via the second carrier (23).

[0103] The power transmitted to the third sun gear (31) can be transmitted to the third planetary gear (32).

[0104] Since the third carrier (33) is connected to the differential device (4), the power transmitted to the third planetary gear (32) can be transmitted to the differential gear (4).

[0105] Power transmitted to the differential device (4) can be transmitted to the pinion gear (4a).

[0106] Power transmitted to the pinion gear (4a) can be transmitted to the intershaft (3) via the side gear (4b) on one side and simultaneously transmitted to the axle shaft (2) via the side gear (4c) on the other side.

[0107] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0108] Power transmitted to the axle shaft (not shown) can be transmitted to the other drive wheel (not shown).

[0109] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The third ring gear (34) is configured to be fixed (F) and can serve to support the third planetary gear (32) so that the third planetary gear (32) can rotate.

[0110] As shown in Fig. 2, the sleeve (5) moves axially by the operation of the second speed actuator (not shown), so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the first carrier (13) and the second ring gear (24) can be driven as one.

[0111] The power of the second gear drive motor (1) can be transmitted simultaneously to the first sun gear (11) and the second sun gear (21).

[0112] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0113] Since the first carrier (13) and the second ring gear (24) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second ring gear (24) via the first carrier (13).

[0114] The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0115] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second planetary gear (22) can be transmitted to the third sun gear (31) via the second carrier (23).

[0116] The power transmitted to the third sun gear (31) can be transmitted to the third planetary gear (32).

[0117] Since the third carrier (33) is connected to the differential device (4), the power transmitted to the third planetary gear (32) can be transmitted to the differential device (4).

[0118] Power transmitted to the differential device (4) can be transmitted to the pinion gear (4a).

[0119] Power transmitted to the pinion gear (4a) can be transmitted to the intershaft (3) via the side gear (4b) on one side and simultaneously transmitted to the axle shaft (2) via the side gear (4c) on the other side.

[0120] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0121] Power transmitted to the axle shaft (2) can be transmitted to the other driving wheel (not shown).

[0122] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The third ring gear (34) is configured to be fixed (F) and can serve to support the third planetary gear (32) so that the third planetary gear (32) can rotate.

[0123] As shown in Fig. 2, by the operation of the third speed actuator (not shown), the sleeve (5) moves axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the second carrier (23) and the second ring gear (24) can be driven as one.

[0124] The power of the third-speed drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21). The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0125] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second planetary gear (22) can be transmitted to the third planetary gear (32) through the second carrier (23) and the third sun gear (31).

[0126] Since the third carrier (33) is connected to the differential device (4), the power transmitted to the third planetary gear (32) can be transmitted to the differential device (4) via the third carrier (33).

[0127] Power transmitted to the differential device (4) can be transmitted to the pinion gear (4a).

[0128] Power transmitted to the pinion gear (4a) can be transmitted to the intershaft (3) via the side gear (4b) on one side and simultaneously transmitted to the axle shaft (2) via the side gear (4c) on the other side.

[0129] The power transmitted to the intershaft (3) can be transmitted to one driving wheel (not shown).

[0130] Power transmitted to the axle shaft (2) can be transmitted to the other driving wheel (not shown).

[0131] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can serve to support the first planetary gear (12) so that the first planetary gear (12) can rotate. The third ring gear (34) is configured to be fixed (F) and can serve to support the third planetary gear (32) so that the third planetary gear (32) can rotate.

[0132] FIG. 3 is a drawing schematically showing the configuration of a reduction device for an electric vehicle according to a third embodiment of the present invention.

[0133] As illustrated in FIG. 3, the third embodiment of the present invention may include a driving motor (1), a first planetary gear set, and a second planetary gear set.

[0134] The configuration of the drive motor (1), the first planetary gear set, the second planetary gear set, and the sleeve (5) of the third embodiment of the present invention is the same as that of the first embodiment, so a detailed description of the configuration thereof is omitted.

[0135] The second carrier (23) can be connected to the second planetary gear (22) and the central axis (232) can be connected to an axle device (not shown).

[0136] The power of the second carrier (23) can be transmitted to an axle device (not shown).

[0137] Power transmitted to the axle device (not shown) can be transmitted to both driving wheels (not shown).

[0138] The following describes the power flow during gear shifting in the third embodiment of the present invention.

[0139] As shown in Fig. 3, the sleeve (5) moves axially by the operation of the first speed actuator (not shown), so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23). As a result, the first carrier (13) and the second carrier (23) can be driven as one.

[0140] The power of the first gear drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0141] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0142] Since the first carrier (13) and the second carrier (23) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13).

[0143] The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0144] Since the central axis (232) of the second carrier (23) is connected to the axle device (not shown), the power transmitted to the second planetary gear (22) can be transmitted to the axle device (not shown) via the second carrier (23).

[0145] Power transmitted to the axle device (not shown) can be transmitted to both driving wheels (not shown).

[0146] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can play a role in supporting the first planetary gear (12) so that the first planetary gear (12) can rotate.

[0147] As shown in Fig. 3, the sleeve (5) moves axially by the operation of the second speed actuator (not shown), so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (131) of the first carrier (13) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the first carrier (13) and the second ring gear (24) can be driven as one.

[0148] The power of the second gear drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21).

[0149] The power transmitted to the first sun gear (11) can be transmitted to the first planetary gear (12).

[0150] Since the first carrier (13) and the second ring gear (24) are driven integrally, the power transmitted to the first planetary gear (12) can be transmitted to the second ring gear (24) via the first carrier (13).

[0151] The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0152] Since the central axis (232) of the second carrier (23) is connected to the axle device (not shown), the power transmitted to the second planetary gear (22) can be transmitted to the axle device (not shown) via the second carrier (23).

[0153] Power transmitted to the axle device (not shown) can be transmitted to both driving wheels (not shown).

[0154] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can play a role in supporting the first planetary gear (12) so that the first planetary gear (12) can rotate.

[0155] As shown in Fig. 3, by the operation of the third speed actuator (not shown), the sleeve (5) moves axially so that the first engagement portion (5a) can be simultaneously engaged with the outer diameter portion (231) of the second carrier (23) and the second engagement portion (5b) can be simultaneously engaged with the outer diameter portion (241) of the second ring gear (24). As a result, the second carrier (23) and the second ring gear (24) can be driven as one.

[0156] The power of the third-speed drive motor (1) can be simultaneously transmitted to the first sun gear (11) and the second sun gear (21). The power transmitted to the second sun gear (21) can be transmitted to the second planetary gear (22).

[0157] Since the central axis (232) of the second carrier (23) is connected to the axle device (not shown), the power transmitted to the second planetary gear (22) can be transmitted to the axle device (not shown) via the second carrier (23).

[0158] Power transmitted to the axle device (not shown) can be transmitted to both driving wheels (not shown).

[0159] Meanwhile, the first ring gear (14) is configured to be fixed (F) and can play a role in supporting the first planetary gear (12) so that the first planetary gear (12) can rotate.

[0160] As discussed above, the present invention enables multi-stage reduction by transmitting power from a drive motor through multiple planetary gear sets. Furthermore, the present invention can be applied to various types of electric vehicle drive units, such as central motors or e-axles.

[0161] The above description is merely an illustrative description of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications, changes, and substitutions may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical idea of ​​the present invention, but rather to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments and the accompanying drawings. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. Drive motor; A first planetary gear set connected to the above driving motor and power; A second planetary gear set provided at a distance from the first planetary gear set while being connected to the driving motor and power; and A sleeve connecting the first carrier of the first planetary gear set and the second carrier of the second planetary gear set, or connecting the first carrier of the first planetary gear set and the second ring gear of the second planetary gear set, or connecting the second carrier of the second planetary gear set and the second ring gear of the second planetary gear set; A reduction device for an electric vehicle including:

2. In paragraph 1, The above first planetary gear set, A first sun gear connected to the drive shaft of the above drive motor; A first planetary gear provided around the first sun gear, which is connected to the first carrier while engaging with the outer diameter of the first sun gear; and A first ring gear fixedly configured by meshing the first planetary gear with the inner diameter; Including, The above second planetary gear set, A second sun gear connected to the drive shaft of the above drive motor; A second planetary gear provided around the second sun gear, which is connected to the second carrier while engaging with the outer diameter of the second sun gear; and A second ring gear in which the second planetary gear is engaged with the inner diameter; A reduction device for an electric vehicle including:

3. In paragraph 2, The above sleeve, A first mating portion provided on one side of the inner diameter; and A second mating part provided on the other side of the inner diameter; A reduction device for an electric vehicle including:

4. In paragraph 3, The above sleeve, In the first speed, the first engagement portion is simultaneously engaged with the outer diameter of the first carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second carrier. In the second gear, the first engagement portion is simultaneously engaged with the outer diameter of the first carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second ring gear. A reduction gear for an electric vehicle, characterized in that the first engagement portion is simultaneously engaged with the outer diameter of the second carrier and the second engagement portion is simultaneously engaged with the outer diameter of the second ring gear, moving in the axial direction of the third gear.

5. In paragraph 4, A third planetary gear set provided at a distance from the second planetary gear set and having power connected to the second planetary gear set; and An intershaft that penetrates the interior of the above driving motor and transmits the power of the third planetary gear set to one driving wheel; A reduction device for an electric vehicle including:

6. In paragraph 5, The above third planetary gear set, A third sun gear connected to the central axis of the second carrier; A third planetary gear provided around the third sun gear, which is connected to the third carrier and power while engaging with the outer diameter of the third sun gear; and A third ring gear in which the third planetary gear is engaged with the inner diameter; Including, A reduction gear for an electric vehicle, characterized in that the central axis of the third carrier is connected to the intershaft.

7. In paragraph 6, The above third planetary gear set is connected to the fourth planetary gear set by power, The above fourth planetary gear set, A fourth planetary gear provided along the circumference of the third ring gear, which is connected to the fourth carrier while engaging with the outer diameter of the third ring gear; and A fourth ring gear in which the fourth planetary gear is engaged with the inner diameter; Including, A reduction device for an electric vehicle, characterized in that the fourth carrier is fixedly configured, and the central axis of the fourth ring gear is connected to an axle shaft that transmits power to the driving wheel on the other side.

8. In paragraph 4, A third planetary gear set is provided at a distance from the second planetary gear set, The above third planetary gear set, A third sun gear connected to the central axis of the second carrier; A third planetary gear provided around the third sun gear, which is connected to the third carrier and power while engaging with the outer diameter of the third sun gear; and A third ring gear fixedly configured by meshing the third planetary gear with the inner diameter; Including, A reduction device for an electric vehicle, characterized in that the third carrier is connected to a differential device and power.

9. In paragraph 8, A reduction gear for an electric vehicle, characterized in that the differential device includes a side gear on one side and a side gear on the other side provided on both sides of a pinion gear, the side gear on the one side being connected to an intershaft that transmits power to a driving wheel on one side, the intershaft is connected to the side gear on the one side by penetrating the inside of the driving motor, and the side gear on the other side being connected to an axle shaft that transmits power to a driving wheel on the other side.

10. In paragraph 4, A reduction device for an electric vehicle, characterized in that the central axis of the second carrier is connected to an axle device that transmits power to the driving wheels on both sides.

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