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 and power-connected to the first planetary gear set; an engagement part provided so as to be spaced apart from the second planetary gear set; and a sleeve which is simultaneously engaged with a first ring gear of the first planetary gear set and the engagement part, or, is simultaneously engaged with the first ring gear and a second carrier 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 cargo 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 by power; a second planetary gear set that is provided at a distance from the first planetary gear set and that is connected to the power of the first planetary gear set; a meshing portion that is provided at a distance from the second planetary gear set; and a sleeve that is simultaneously meshed with a first ring gear of the first planetary gear set and the meshing portion, or with a second carrier of the second planetary gear set and the first ring gear.

[0012] Additionally, the first carrier can be powered by the second ring gear of the second planetary gear set.

[0013] In addition, the sleeve may include a first engagement portion provided on one outer diameter portion facing the first ring gear; a second engagement portion provided on the other outer diameter portion facing the engagement portion; and a third engagement portion that protrudes further in the direction of the first ring gear than the first engagement portion.

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

[0015] In addition, the first planetary gear set may include a first sun gear that is connected to the drive shaft of the drive motor and power; and a first planetary gear that is provided around the first sun gear and is engaged with an outer diameter of the first sun gear and an inner diameter of the first ring gear between the first sun gear and the first ring gear so that the first carrier and power are connected; and the second planetary gear set may include a second sun gear that is fixedly configured; and a second planetary gear that is provided around the second sun gear and is engaged with an outer diameter of the second sun gear and an inner diameter of the second ring gear between the second sun gear and the second ring gear so that the second carrier and power are connected.

[0016] Additionally, the central axis of the second carrier can be connected to the third sun gear of the third planetary gear set.

[0017] In addition, the third planetary gear set is provided around the third sun gear, and includes a third planetary gear that meshes with an outer diameter of the third sun gear and is connected to the third carrier through power; and a third ring gear that meshes with the third planetary gear on an inner diameter; and the central axis of the third carrier can be connected to an intershaft that transmits power to one driving wheel.

[0018] Additionally, the intershaft may be connected to the central axis of the third carrier by penetrating the interior of the driving motor.

[0019] 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 meshes with an outer diameter portion of the third ring gear; and a fourth ring gear that meshes with an inner diameter portion of the fourth planetary gear; and the meshing portion is a fourth carrier, and the fourth carrier can be configured to be connected and fixed to the fourth planetary gear and to be meshable with a second meshing portion of the sleeve on the inner diameter portion.

[0020] Additionally, the central axis of the fourth ring gear can be connected to an axle shaft that transmits power to the other driving wheel.

[0021] In addition, the above-mentioned mating part is a fixed part, and the fixed part is configured to be fixed while being independently configured, and the second mating part of the sleeve can be configured to be mated to the inner diameter.

[0022] In addition, the third planetary gear set may include a third planetary gear that is provided around the third sun gear and is connected to a third carrier that is connected to the differential device and power while engaging with an outer diameter of the third sun gear; and a third ring gear that is fixedly configured and engages with the third planetary gear at an inner diameter.

[0023] In addition, the differential device includes a side gear on one side and a side gear on the other side that are engaged on both sides of the pinion gear, and the side gear on the one side is connected to an intershaft configured to penetrate the inside of the drive motor while transmitting power to a driving wheel on one side, and the side gear on the other side can be connected to an axle shaft that transmits power to a driving wheel on the other side.

[0024] Additionally, the central axis of the second carrier can be connected to an axle device that transmits power to both driving wheels.

[0025] The present invention can achieve multi-stage reduction by having the power of the driving motor pass through a plurality of planetary gear sets.

[0026] 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.

[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] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] As illustrated in Fig. 1, the first embodiment of the present invention may include a driving motor (1), a first planetary gear set, a second planetary gear set, a meshing portion, a third planetary gear set, a fourth planetary gear set, and a sleeve (4). For example, the meshing portion may be a fourth carrier (43).

[0033] The first planetary gear set may include a first sun gear (11) that is powered by a drive shaft (1a) of a drive motor (1), a first planetary gear (12) that is powered by the first sun gear (11), a first carrier (13) that is powered by the first planetary gear (12), and a first ring gear (14) that is powered by the first planetary gear (12).

[0034] The central axis of the first sun gear (11) can be connected to the driving shaft (1a) of the driving motor (1).

[0035] The first planetary gear (12) may be configured in plurality along the circumference of the first sun gear (11). The first planetary gear (12) may be meshed with the outer diameter of the first sun gear (11) and the inner diameter of the first ring gear (14) between the first sun gear (11) and the first ring gear (14). The central axis of the first planetary gear (12) may be connected to the first carrier (13).

[0036] The inner diameter of the first ring gear (14) can be configured to be meshed with the first meshing portion (4a) or the third meshing portion (4c) of the sleeve (4).

[0037] The second planetary gear set may include a second sun gear (21) formed at a distance from the first sun gear (11), a second planetary gear (22) connected to the second sun gear (21) by power, a second carrier (23) connected to the second planetary gear (22) by power, and a second ring gear (24) connected to the second planetary gear (22) by power.

[0038] The central axis of the second sun gear (21) can be configured to be fixed (F).

[0039] The second planetary gear (22) may be configured in multiple numbers along the circumference of the second sun gear (21).

[0040] The second planetary gear (22) can be engaged with the outer diameter of the second sun gear (21) and the inner diameter of the second ring gear (24) between the second sun gear (21) and the second ring gear (24). The central axis of the second planetary gear (22) can be connected to the second carrier (23).

[0041] The first carrier (13) and the second ring gear (24) can be connected to power.

[0042] The sleeve (4) may have a first engagement portion (4a), a second engagement portion (4b), and a third engagement portion (4c). The first engagement portion (4a) may be formed on an outer diameter portion on one side of the sleeve (4) facing the first ring gear (14). The second engagement portion (4b) may be formed on an outer diameter portion on the other side facing the fourth planetary gear set. The third engagement portion (4c) may be formed to further protrude from the first engagement portion (4a) toward the first ring gear (14).

[0043] The sleeve (4) can be moved axially by the actuator (A).

[0044] 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) so that the second planetary gear (22) can rotate, 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). For example, the outer diameter (231) of the second carrier (23) may be configured so as to be able to engage with the first engagement portion (4a) of the sleeve (4).

[0045] 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.

[0046] The third planetary gear set may include a third sun gear (31) connected to the central axis (232) of the second carrier (23) and the power, a third planetary gear (32) connected to the third sun gear (31) and the power, a third carrier (33) connected to the third planetary gear (32) and the power, and a third ring gear (34) connected to the third planetary gear (32) and the power.

[0047] The third planetary gear (32) may be provided 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) through power by meshing with the outer diameter of the third sun gear (31).

[0049] The central axis (332) of the third carrier (33) can be connected to the intershaft (2). The intershaft (2) can pass through the driving motor (1) and be connected to the central axis (332) of the third carrier (33).

[0050] The intershaft (2) can transmit power to one driving wheel (not shown).

[0051] A third planetary gear (32) can be meshed with the inner diameter of the third ring gear (34). The third ring gear (34) can serve as a sun gear of the fourth planetary gear set.

[0052] The fourth planetary gear set may include a fourth planetary gear (42) that meshes with the outer diameter of the third ring gear (34), and a fourth ring gear (44) that is connected to the fourth planetary gear (42) through power.

[0053] The meshing part provided at a gap from the second planetary gear set is a fourth carrier (43), and the fourth carrier (43) can be configured as fixed (F). The fourth carrier (43) can be connected to the central axis of the fourth planetary gear (42).

[0054] The fourth planetary gear (42) may be provided in multiple numbers along the circumference of the third ring gear (34).

[0055] The fourth planetary gear (42) can be meshed with the outer diameter of the third ring gear (34).

[0056] The fourth planetary gear (42) can be meshed with the inner diameter of the fourth ring gear (44).

[0057] The central axis (442) of the fourth ring gear (44) can be connected to an axle shaft (not shown) for power. The axle shaft (not shown) can transmit power to the other driving wheel (not shown).

[0058] The following describes the power flow during gear shifting of the first embodiment of the present invention.

[0059] As shown in Fig. 1, by the operation of the first speed actuator (A), the sleeve (4) moves axially so that the second engagement portion (4b) can be simultaneously engaged with the inner diameter (431) of the fourth carrier (43) and the third engagement portion (4c) can be simultaneously engaged with the inner diameter (141) of the first ring gear (14). As a result, the first ring gear (14) can be fixed.

[0060] The power of the first gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0061] Since the power of the first carrier (13) and the second ring gear (24) is connected and the first ring gear (14) is fixed, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13), the second ring gear (24), and the second planetary gear (22).

[0062] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second carrier (23) can be transmitted to the third planetary gear (32) via the third sun gear (31).

[0063] Since the central axis (332) of the third carrier (33) is connected to the intershaft (2) 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 (2) 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] Power transmitted to the intershaft (2) 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] As shown in Fig. 1, the sleeve (4) moves axially by the operation of the second speed actuator (A) so that the first engagement portion (4a) can be simultaneously engaged with the inner diameter portion (141) of the first ring gear (14) and the outer diameter portion (231) of the second carrier (23). As a result, the first ring gear (14) and the second carrier (23) can be driven as one unit.

[0067] The power of the second gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0068] Since the power of the first carrier (13) and the second ring gear (24) is connected and the first ring gear (14) and the second carrier (23) are driven as one, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) through the first carrier (13), the second ring gear (24), and the second planetary gear (22), and at the same time, can be transmitted to the second carrier (23) through the first ring gear (14).

[0069] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second carrier (23) can be transmitted to the third planetary gear (32) via the third sun gear (31).

[0070] Since the central axis (332) of the third carrier (33) is connected to the intershaft (2) 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 (2) 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).

[0071] Power transmitted to the intershaft (2) can be transmitted to one driving wheel (not shown).

[0072] Power transmitted to the axle shaft (not shown) can be transmitted to the other drive wheel (not shown).

[0073] 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.

[0074] As illustrated in FIG. 2, the second embodiment of the present invention may include a driving motor (1), a first planetary gear set, a second planetary gear set, a third planetary gear set, a sleeve (4), and a meshing portion. For example, the meshing portion may be a fixed portion (5).

[0075] The configuration of the drive motor (1), the first planetary gear set, the second planetary gear set, the third planetary gear set, and the sleeve (4) of the second embodiment of the present invention is the same as that of the first embodiment, so a detailed description of the configuration is omitted.

[0076] The third ring gear (34) of the third planetary gear set can be configured as fixed (F). The third carrier (33) of the third planetary gear set can be connected to the differential device (3) through a central shaft (332).

[0077] The differential device (3) may include a side gear (3b) on one side and a side gear (3c) on the other side that mesh with each other on both sides of the pinion gear (3a).

[0078] One side gear (3b) can be connected to the intershaft (2) for power. The intershaft (2) can be connected to the one side gear (3b) by penetrating the interior of the driving motor (1).

[0079] Power transmitted to the differential device (3) can be simultaneously transmitted to one side gear (3b) and the other side gear (3c) via the pinion gear (3a).

[0080] Power transmitted to one side gear (3b) can be transmitted to one side drive wheel (not shown) via the intershaft (2).

[0081] Power transmitted to the other side gear (3c) can be transmitted to the other side drive wheel (not shown) via the axle shaft (not shown).

[0082] The following describes the power flow during gear shifting in the second embodiment of the present invention.

[0083] As shown in Fig. 2, by the operation of the first speed actuator (A), the sleeve (4) moves axially so that the second engagement portion (4b) can be simultaneously engaged with the inner diameter portion (5a) of the fixed portion (5) and the third engagement portion (4c) can be simultaneously engaged with the inner diameter portion (141) of the first ring gear (14). As a result, the first ring gear (14) can be fixed.

[0084] The power of the first gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0085] Since the first carrier (13) and the second ring gear (24) are connected in power and the first ring gear (14) is fixed, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13), the second ring gear (24), and the second planetary gear (22).

[0086] Since the central axis (232) of the second carrier (23) is connected to the third sun gear (31), the power transmitted to the second carrier (23) can be transmitted to the third planetary gear (32) via the third sun gear (31).

[0087] Since the third carrier (33) is connected to the differential device (3), the power transmitted to the third planetary gear (32) can be transmitted to the differential device (3) via the third carrier (33).

[0088] Power transmitted to the differential device (3) can be simultaneously transmitted to one side gear (3b) and the other side gear via the pinion gear (3a).

[0089] Power transmitted to one side gear (3a) can be transmitted to one side drive wheel (not shown) via the intershaft (2).

[0090] Power transmitted to the other side gear (3c) can be transmitted to the other side drive wheel (not shown) via the axle shaft (not shown).

[0091] As shown in Fig. 2, the sleeve (4) moves axially by the operation of the second speed actuator (A), so that the first engagement portion (4a) can be simultaneously engaged with the inner diameter portion (141) of the first ring gear (14) and the outer diameter portion (231) of the second carrier (23). As a result, the first ring gear (14) and the second carrier (23) can be driven as one unit.

[0092] The power of the second gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0093] Since the power of the first carrier (13) and the second ring gear (24) is connected and the first ring gear (14) and the second carrier (23) are driven as one, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) through the first carrier (13), the second ring gear (24), and the second planetary gear (22), and at the same time, can be transmitted to the second carrier (23) through the first ring gear (14).

[0094] Since the third carrier (33) is connected to the differential device (3), the power transmitted to the second carrier (23) can be transmitted to the differential device (3).

[0095] Power transmitted to the differential device (3) can be simultaneously transmitted to one side gear (3b) and the other side gear (3c) via the pinion gear (3a).

[0096] Power transmitted to one side gear (3b) can be transmitted to one side drive wheel (not shown) via the intershaft (2).

[0097] Power transmitted to the other side gear (3c) can be transmitted to the other side drive wheel (not shown) via the axle shaft (not shown).

[0098] 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.

[0099] As illustrated in FIG. 3, the third embodiment of the present invention may include a driving motor (1), a first planetary gear set, a second planetary gear set, a sleeve (4), and a meshing portion. For example, the meshing portion may be a fixed portion (5).

[0100] The configuration of the drive motor (1), the first planetary gear set, the second planetary gear set, the sleeve (4), and the meshing portion of the third embodiment of the present invention is the same as that of the first embodiment, so a detailed description of the configuration is omitted.

[0101] The central axis (232) of the second carrier (23) of the second planetary gear set can be connected to an axle device (not shown). Power transmitted to the axle device (not shown) can be transmitted to both driving wheels (not shown).

[0102] The following describes the power flow during gear shifting in the third embodiment of the present invention.

[0103] As shown in Fig. 3, by the operation of the first speed actuator (A), the sleeve (4) moves axially so that the second engagement portion (4b) can be simultaneously engaged with the inner diameter portion (5a) of the fixed portion (5) and the third engagement portion (4c) can be simultaneously engaged with the inner diameter portion (141) of the first ring gear (14). As a result, the first ring gear (14) can be fixed.

[0104] The power of the first gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0105] Since the first carrier (13) and the second ring gear (24) are connected in power and the first ring gear (14) is fixed, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) via the first carrier (13), the second ring gear (24), and the second planetary gear (22).

[0106] The power transmitted to the second carrier (23) can be transmitted to both driving wheels (not shown) via an axle device (not shown).

[0107] As shown in Fig. 3, the sleeve (4) moves axially by the operation of the second speed actuator (A), so that the first engagement portion (4a) can be simultaneously engaged with the inner diameter portion (141) of the first ring gear (14) and the outer diameter portion (231) of the second carrier (23). As a result, the first ring gear (14) and the second carrier (23) can be driven as one unit.

[0108] The power of the second gear drive motor (1) can be transmitted to the first planetary gear (12) via the first sun gear (11).

[0109] Since the first carrier (13) and the second ring gear (24) are connected by power and the first ring gear (14) and the second carrier (23) are driven as one, the power transmitted to the first planetary gear (12) can be transmitted to the second carrier (23) through the first carrier (13), the second ring gear (24), and the second planetary gear (22), and at the same time, can be transmitted to the second carrier (23) through the first ring gear (14).

[0110] Since the central axis (232) of the second carrier (23) is connected to the axle device (not shown), the power transmitted to the second carrier (23) can be transmitted to the driving wheels on both sides (not shown) via the axle device (not shown).

[0111] 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.

[0112] 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 and having power connected to the first planetary gear set; A meshing part provided at a distance from the second planetary gear set; and A sleeve that is simultaneously engaged with the first ring gear of the first planetary gear set and the engagement portion, or is simultaneously engaged with the first ring gear and the second carrier of the second planetary gear set; A reduction device for an electric vehicle including:

2. In paragraph 1, The above first carrier is, A reduction gear for an electric vehicle, characterized in that the second ring gear of the second planetary gear set is connected to the power.

3. In paragraph 2, The above sleeve, A first engagement portion provided on one outer diameter portion facing the first ring gear; A second mating portion provided on the outer diameter of the other side facing the mating portion; and A third engagement portion protruding further in the direction of the first ring gear than the first engagement portion; A reduction device for an electric vehicle including:

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

5. In paragraph 4, The above first planetary gear set, A first sun gear connected to the drive shaft of the above drive motor; and A first planetary gear provided around the first sun gear, which meshes with the outer diameter of the first sun gear and the inner diameter of the first ring gear between the first sun gear and the first ring gear and is powered by the first carrier; Including, The above second planetary gear set, A second sun gear having a fixed configuration; and A second planetary gear provided around the second sun gear, which meshes with the outer diameter of the second sun gear and the inner diameter of the second ring gear between the second sun gear and the second ring gear and is powered by the second carrier; A reduction device for an electric vehicle including:

6. In paragraph 5, The central axis of the above second carrier is, A reduction gear for an electric vehicle characterized in that the third sun gear of the third planetary gear set is connected to the power.

7. In paragraph 6, The above third planetary gear set, A third planetary gear provided around the third sun gear, which is connected to the third carrier by 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 an intershaft that transmits power to one driving wheel.

8. In paragraph 7, The above intershaft is, A reduction gear for an electric vehicle, characterized in that it penetrates the interior of the driving motor and is connected to the central axis of the third carrier.

9. In paragraph 7, 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 and meshed 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 gear for an electric vehicle, characterized in that the above-mentioned engagement portion is a fourth carrier, and the fourth carrier is connected to and fixed to the fourth planetary gear, and the second engagement portion of the sleeve is configured to be engaged with the inner diameter portion.

10. In paragraph 9, The central axis of the above fourth ring gear is A reduction device for an electric vehicle characterized by being connected to an axle shaft that transmits power to the driving wheels on the other side.

11. In paragraph 5, The above-mentioned mating part is a fixed part, The above fixed part, A reduction gear for an electric vehicle characterized in that it is independently configured and fixedly configured, and the second engagement portion of the sleeve is configured to be engageable with the inner diameter.

12. In paragraph 11, The above third planetary gear set, A third planetary gear which is provided around the third sun gear and is connected to a third carrier that is connected to the differential device and power while engaging with the outer diameter of the third sun gear; and A third ring gear having a fixed configuration, wherein the third planetary gear is engaged with the inner diameter; A reduction device for an electric vehicle including:

13. In paragraph 12, 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 that are engaged on both sides of a pinion gear, the side gear on the one side being connected to an intershaft configured to penetrate the inside of the drive motor while transmitting power to a driving wheel on one side, 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.

14. In paragraph 11, 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.

Images