Power system and agricultural machine

Abstract

A kind of power system and agricultural machinery, power system includes engine, first output shaft, second output shaft, first motor, second motor, planetary gear device and brake device, the planetary gear device includes sun gear, planet carrier and ring gear, engine is powered by first output shaft;Second output shaft is connected with planet carrier, and second output shaft is used to output power to rear axle;Ring gear is provided with outer tooth on the outer side away from planet carrier, first motor is connected with outer tooth and first output shaft respectively;Second motor is connected with sun gear;Brake device is braked by engaging with outer tooth.This power system can reduce brake torque, and reduce the size of brake.

Description

Technical Field

[0001] This utility model relates to the field of agricultural machinery drive technology, and in particular to a power system and agricultural machinery. Background Technology

[0002] Currently, most agricultural tractors in my country use diesel engines as their power source, resulting in low energy efficiency, poor emissions, and severe pollution. With the continuous improvement of agricultural mechanization in my country and the increasingly severe global energy problem, developing new energy tractors has become an inevitable trend. However, current limitations in battery and charging technologies mean that pure electric tractors cannot meet the needs of actual operations in terms of range and work efficiency. Therefore, developing hybrid tractors has significant technological and application advantages.

[0003] Prior art with application number 202410188802.3 discloses a tractor with a hybrid power system, wherein the hybrid power system includes an engine, a generator, a drive motor, a planetary gear assembly, and a brake. The engine outputs power through the engine output shaft. The generator is linked to the ring gear of the planetary gear assembly and the engine output shaft. The drive motor is linked to the sun gear of the planetary gear assembly. The brake is mounted on the ring gear. When the brake is closed, the brake engages with the ring gear, preventing the ring gear from rotating and transmitting power. When the brake is disengaged, the brake separates from the ring gear, allowing the ring gear to rotate and transmit power.

[0004] Since the brake is connected to the gear ring, the braking force provided by the brake acts directly on the gear ring to overcome the torque transmitted by the gear ring. However, the gear ring transmits a large torque, and the gear ring requires a large braking torque. Therefore, a larger brake is needed to meet the braking requirements of the gear ring, and a larger brake will occupy more space. Utility Model Content

[0005] In view of this, the present invention provides a power system that can significantly reduce braking torque, reduce brake size, and save installation space and weight.

[0006] A power system, comprising: The system comprises an engine, a first output shaft, a second output shaft, a first motor, a second motor, a planetary gear assembly, and a braking device. The planetary gear assembly includes a sun gear, a planet carrier, and a ring gear. The engine is connected to output power through the first output shaft; The second output shaft is linked to the planetary carrier and is used to output power to the rear axle; The gear ring has external teeth on its outer side away from the planetary carrier, and the first motor is linked to the external teeth and the first output shaft respectively. The second motor is linked to the sun gear; The braking device achieves braking through the engagement of the external teeth.

[0007] Optionally, the braking device includes a brake gear, a brake shaft, and a brake, wherein the brake gear is connected to the brake shaft, the brake gear meshes with the external gear, and the brake is used to brake or unlock the brake shaft.

[0008] Optionally, the sun gear is loosely fitted onto the first output shaft.

[0009] Optionally, a first gear is connected to the first output shaft; the power system further includes a transmission shaft, on which a second gear and a third gear are connected, the second gear being linked to the first gear, the third gear meshing with the external gear, and the power output by the engine being transmitted to the first motor via the first gear, the second gear, and the transmission shaft.

[0010] Optionally, the first power shaft of the first motor is connected to the transmission shaft, or a fourth gear is connected to the first power shaft of the first motor, and the fourth gear meshes with the second gear.

[0011] Optionally, the fourth gear is located between the first gear and the second gear, and the fourth gear meshes with the first gear and the second gear respectively.

[0012] Optionally, the first power shaft of the first motor is connected to the transmission shaft, and the power system further includes a first inertial shaft, on which a first idler wheel is connected. The first idler wheel is located between the first gear and the second gear, and the first idler wheel meshes with the first gear and the second gear respectively.

[0013] Optionally, the second gear is fixedly connected to the drive shaft, and the third gear is loosely fitted on the drive shaft. The power system further includes a first shifting mechanism connected to the drive shaft, and the first shifting mechanism includes a first station and a second station. When the first shifting mechanism is in the first working position, the third gear rotates freely relative to the transmission shaft; When the first shifting mechanism is in the second working position, the third gear is engaged with the transmission shaft.

[0014] Optionally, the output end of the planetary carrier is connected to a first driving gear and a second driving gear, and a first driven gear and a second driven gear are loosely fitted on the second output shaft. The first driving gear meshes with the first driven gear, and the second driving gear meshes with the second driven gear. The power system further includes a second shifting mechanism connected to the second output shaft. The second shifting mechanism includes a third station, a fourth station, and a fifth station. When the second shifting mechanism is in the third position, the first driven gear and the second driven gear rotate freely relative to the second output shaft; When the second shifting mechanism is in the fourth position, the first driven gear is engaged with the second output shaft, and the second driven gear rotates freely relative to the second output shaft; When the second shifting mechanism is in the fifth position, the second driven gear is engaged with the second output shaft, and the first driven gear rotates freely relative to the second output shaft.

[0015] Optionally, a fifth gear is connected to the second power shaft of the second motor, and a drive tooth is provided at the input end of the sun gear, the drive tooth being connected to the fifth gear.

[0016] Optionally, the power system further includes a second inertial shaft, on which a second idler wheel is connected. The second idler wheel is located between the fifth gear and the drive gear, and meshes with the fifth gear and the drive gear respectively.

[0017] This application also relates to an agricultural machine, including the aforementioned power system.

[0018] The braking device of the power system of this utility model engages with the external teeth of the gear ring to brake the gear ring. The braking device only requires a small braking force to brake the gear ring, which can greatly reduce the braking torque. Therefore, a smaller brake can meet the braking requirements of the gear ring, saving installation space and weight. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the power system of the first embodiment of this application.

[0020] Figure 2 This is a schematic diagram of the power system according to the second embodiment of this application.

[0021] Figure 3 This is a schematic diagram of the power system according to the third embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the power system according to the fourth embodiment of this application.

[0023] Figure 5 This is a schematic diagram of the power system according to the fifth embodiment of this application. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification.

[0025] In the following description, reference is made to the accompanying drawings, which illustrate several embodiments of the present application. It should be understood that other embodiments may also be used, and changes in mechanical composition, structure, electrical and operational aspects may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered limiting, and the terminology used herein is for describing particular embodiments only and is not intended to limit the present application.

[0026] Although the terms first, second, etc., are used in some instances to describe various elements herein, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0027] Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of a feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition arise only when combinations of elements, functions, steps, or operations are inherently mutually exclusive in some way.

[0028] First Embodiment Figure 1 This is a schematic diagram of the power system according to the first embodiment of this application, as shown below. Figure 1 As shown, the power system includes: Engine 11, first output shaft 12, second output shaft 13, first motor 14, second motor 15, planetary gear assembly 16, and braking device 17. The planetary gear assembly 16 includes a sun gear 161, a planet carrier 162, and a ring gear 163, wherein: Engine 11 outputs power through first output shaft 12; The second output shaft 13 is linked to the planetary carrier 162, and the second output shaft 13 is used to output power to the rear axle. The gear ring 163 has an external tooth 1631 on its outer side away from the planet carrier 162, and the first motor 14 is linked to the external tooth 1631 and the first output shaft 12 respectively. The second motor 15 is linked to the sun gear 161; The braking device 17 achieves braking by engaging with the external gear 1631.

[0029] The braking device 17 of the power system of this application engages with the external teeth 1631 of the gear ring 163 to brake the gear ring 163. The braking device 17 only requires a small braking force to brake the gear ring 163, which can greatly reduce the braking torque. Therefore, the smaller size of the brake 173 can meet the braking requirements of the gear ring 163, saving installation space and weight.

[0030] Optionally, the braking device 17 includes a braking gear 171, a braking shaft 172, and a brake 173. The braking gear 171 is connected to the braking shaft 172 and meshes with an external gear 1631. The brake 173 is used to brake or unlock the braking shaft 172. In this embodiment, the planet carrier 162 meshes with the sun gear 161 and the ring gear 163 via planet gears 1621. The inner side of the ring gear 163 is provided with internal teeth 1632 that mesh with the planet gears 1621.

[0031] Optionally, the first motor 14 is a generator and the second motor 15 is a drive motor, or the second motor 15 is a generator and the first motor 14 is a drive motor.

[0032] Optionally, a portion of the power output from the engine 11 drives the first motor 14 to rotate and generate electricity, while the other portion is transmitted to the power take-off (PTO) device via the first output shaft 12. In this embodiment, the power system also includes a battery, which is electrically connected to both the first motor 14 and the second motor 15. The electricity generated by the first motor 14 is stored in the battery, which is used to provide power to the second motor 15.

[0033] Optionally, the power output from the second motor 15 is transmitted to the rear axle via the sun gear 161, planet carrier 162, and second output shaft 13.

[0034] Optionally, the sun gear 161 is loosely fitted onto the first output shaft 12.

[0035] Optionally, such as Figure 1As shown, a first gear 121 is connected to the first output shaft 12; the power system also includes a drive shaft 18, on which a second gear 181 and a third gear 182 are connected. The second gear 181 is linked to the first gear 121, and the third gear 182 meshes with the external gear 1631. The power output by the engine 11 is transmitted to the first motor 14 via the first gear 121, the second gear 181, and the drive shaft 18. In this embodiment, the first motor 14 meshes with the external gear 1631 of the gear ring 163 through the third gear 182, which increases the radial installation space of the first motor 14.

[0036] Optionally, such as Figure 1 As shown, the first power shaft 141 of the first motor 14 is connected to the transmission shaft 18. In this embodiment, the first power shaft 141 and the transmission shaft 18 are coaxially arranged, and the power output by the engine 11 is transmitted to the first motor 14 via the first gear 121, the transmission shaft 18, and the first power shaft 141.

[0037] Optionally, such as Figure 1 As shown, the second gear 181 is fixedly connected to the drive shaft 18, and the third gear 182 is loosely fitted on the drive shaft 18. The power system also includes a first shifting mechanism 19, which is connected to the drive shaft 18. The first shifting mechanism 19 includes a first station and a second station. When the first shifting mechanism 19 is in the first working position, the third gear 182 rotates freely relative to the transmission shaft 18, that is, the third gear 182 and the transmission shaft 18 can rotate independently. At this time, the gear ring 163 can drive the third gear 182 to rotate freely relative to the transmission shaft 18. When the first shifting mechanism 19 is in the second position, the third gear 182 is engaged with the transmission shaft 18, that is, the third gear 182 and the transmission shaft 18 can rotate synchronously. At this time, the gear ring 163 can drive the third gear 182 and the transmission shaft 18 to rotate synchronously.

[0038] Optionally, such as Figure 1 As shown, the output end of the planetary carrier 162 is connected to a first driving gear 1622 and a second driving gear 1623. A first driven gear 131 and a second driven gear 132 are loosely fitted onto the second output shaft 13. The first driving gear 1622 meshes with the first driven gear 131, and the second driving gear 1623 meshes with the second driven gear 132. The power system also includes a second shifting mechanism 21, which is connected to the second output shaft 13. The second shifting mechanism 21 includes a third station, a fourth station, and a fifth station. When the second shifting mechanism 21 is in the third position, the first driven gear 131 and the second driven gear 132 rotate freely relative to the second output shaft 13, that is, the first driven gear 131, the second driven gear 132 and the transmission shaft 18 can rotate independently. At this time, the planetary carrier 162 can drive the first driven gear 131 and the second driven gear 132 to rotate freely relative to the second output shaft 13. When the second shifting mechanism 21 is in the fourth position, the first driven gear 131 is engaged with the second output shaft 13, and the second driven gear 132 rotates freely relative to the second output shaft 13. That is, the first driven gear 131 and the second output shaft 13 can rotate synchronously, and the second driven gear 132 and the second output shaft 13 can rotate independently. At this time, the planetary carrier 162 can drive the first driven gear 131 and the second output shaft 13 to rotate synchronously. When the second shifting mechanism 21 is in the fifth position, the second driven gear 132 is engaged with the second output shaft 13, and the first driven gear 131 rotates relative to the second output shaft 13. That is, the second driven gear 132 and the second output shaft 13 can rotate synchronously, and the first driven gear 131 and the second output shaft 13 can rotate independently. At this time, the planetary carrier 162 can drive the second driven gear 132 and the second output shaft 13 to rotate synchronously.

[0039] Optionally, a fifth gear 152 is connected to the second power shaft 151 of the second motor 15, and a drive tooth 1611 is provided at the input end of the sun gear 161, which is connected to the fifth gear 152. In this embodiment, the fifth gear 152 meshes with the drive tooth 1611 of the sun gear 161.

[0040] Optionally, the powertrain includes a pure electric mode, a range-extended mode, and a hybrid mode; the pure electric mode includes pure electric mode 1 and pure electric mode 2; the range-extended mode includes range-extended mode 1 and range-extended mode 2; and the hybrid mode includes hybrid mode 1 and hybrid mode 2.

[0041] When the power system is in pure electric first gear working mode, the brake 173 brakes the brake shaft 172, the first shift mechanism 19 switches to the first position, the second shift mechanism 21 switches to the fourth position, and the second motor 15 drives the system.

[0042] When the power system is in pure electric 2nd gear working mode, the brake 173 brakes the brake shaft 172, the first shift mechanism 19 switches to the first position, the second shift mechanism 21 switches to the fifth position, and the second motor 15 drives the system.

[0043] When the power system is in range-extending 1st gear working mode, the brake 173 brakes the brake shaft 172, the first shift mechanism 19 switches to the first position, the second shift mechanism 21 switches to the fourth position, the engine 11 drives the first motor 14 to generate electricity, and the second motor 15 drives the engine.

[0044] When the power system is in range-extending 2nd gear working mode, the brake 173 brakes the brake shaft 172, the first shift mechanism 19 shifts to the first position, the second shift mechanism 21 shifts to the fifth position, the engine 11 drives the first motor 14 to generate electricity, and the second motor 15 drives the engine.

[0045] When the power system is in hybrid 1st gear working mode, the brake 173 unlocks the brake shaft 172, the first shift mechanism 19 switches to the second position, the second shift mechanism 21 switches to the fourth position, and the engine 11 and the second motor 15 are driven.

[0046] When the power system is in hybrid 2-speed working mode, the brake 173 unlocks the brake shaft 172, the first shift mechanism 19 switches to the second position, the second shift mechanism 21 switches to the fifth position, and the engine 11 and the second motor 15 are driven.

[0047] Second Embodiment Figure 2 This is a schematic diagram of the power system according to the second embodiment of this application, as shown below. Figure 2 As shown, the power system of this embodiment has a similar structure and function to the power system of the first embodiment. The difference is that a fourth gear 142 is connected to the first power shaft 141 of the first motor 14, and the fourth gear 142 meshes with the second gear 181. This arrangement can increase the installation space of the first motor 14.

[0048] Third Embodiment Figure 3 This is a schematic diagram of the power system according to the third embodiment of this application, as shown below. Figure 3 As shown, the power system of this embodiment has a similar structure and function to the power system of the second embodiment, the difference being the different positions of the first motor 14.

[0049] Optionally, the fourth gear 142 is located between the first gear 121 and the second gear 181, and the fourth gear 142 meshes with the first gear 121 and the second gear 181 respectively.

[0050] The arrangement of the first motor 14 in this embodiment not only increases the installation space of the first motor 14, but also changes the rotation direction of the second output shaft 13.

[0051] Fourth embodiment Figure 4 This is a schematic diagram of the power system according to the fourth embodiment of this application, as shown below. Figure 4 As shown, the power system of this embodiment has a similar structure and function to the power system of the first embodiment, except that the power system also includes a first inertial shaft 22.

[0052] Optionally, a first idler wheel 221 is connected to the first idler shaft 22. The first idler wheel 221 is located between the first gear 121 and the second gear 181, and the first idler wheel 221 meshes with the first gear 121 and the second gear 181 respectively.

[0053] In this embodiment, a first idler gear 221 is arranged between the first gear 121 and the second gear 181, which can both increase the installation space of the first motor 14 and change the rotation direction of the second output shaft 13.

[0054] Fifth embodiment Figure 5 This is a schematic diagram of the power system according to the fifth embodiment of this application, as shown below. Figure 5 As shown, the power system of this embodiment has a similar structure and function to the power system of the above embodiment, except that the power system also includes a second inertial shaft 23.

[0055] Optionally, a second idler wheel 231 is connected to the second idler shaft 23. The second idler wheel 231 is located between the fifth gear 152 and the drive gear 1611, and the second idler wheel 231 meshes with the fifth gear 152 and the drive gear 1611 respectively.

[0056] In this embodiment, a second idler gear 231 is arranged between the fifth gear 152 and the drive gear 1611. This design can be applied to any of the above embodiments, and this arrangement can increase the installation space of the second motor 15.

[0057] Sixth Embodiment This application also relates to an agricultural machine including the aforementioned power system. In this embodiment, the agricultural machine is, for example, a tractor, but is not limited thereto.

[0058] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A power system, characterized in that, include: The engine (11), first output shaft (12), second output shaft (13), first motor (14), second motor (15), planetary gear assembly (16), and braking device (17) are provided. The planetary gear assembly (16) includes a sun gear (161), a planet carrier (162), and a ring gear (163), wherein: The engine (11) outputs power through the first output shaft (12); The second output shaft (13) is linked to the planetary carrier (162), and the second output shaft (13) is used to output power to the rear axle; The gear ring (163) has an external tooth (1631) on the outer side away from the planet carrier (162), and the first motor (14) is linked to the external tooth (1631) and the first output shaft (12) respectively. The second motor (15) is linked to the sun gear (161); The braking device (17) achieves braking by engaging with the external teeth (1631).

2. The power system as described in claim 1, characterized in that, The braking device (17) includes a brake gear (171), a brake shaft (172), and a brake (173). The brake gear (171) is connected to the brake shaft (172), and the brake gear (171) meshes with the external gear (1631). The brake (173) is used to brake or unlock the brake shaft (172).

3. The power system as described in claim 1, characterized in that, The sun gear (161) is loosely fitted onto the first output shaft (12); and / or, The first output shaft (12) is connected to a first gear (121); the power system also includes a transmission shaft (18), on which a second gear (181) and a third gear (182) are connected. The second gear (181) is linked to the first gear (121), and the third gear (182) meshes with the external gear (1631). The power output by the engine (11) is transmitted to the first motor (14) via the first gear (121), the second gear (181), and the transmission shaft (18).

4. The power system as described in claim 3, characterized in that, The first power shaft (141) of the first motor (14) is connected to the transmission shaft (18), or a fourth gear (142) is connected to the first power shaft (141) of the first motor (14), and the fourth gear (142) meshes with the second gear (181).

5. The power system as described in claim 4, characterized in that, The fourth gear (142) is located between the first gear (121) and the second gear (181), and the fourth gear (142) meshes with the first gear (121) and the second gear (181) respectively.

6. The power system as described in claim 3, characterized in that, The first power shaft (141) of the first motor (14) is connected to the transmission shaft (18). The power system also includes a first inertial shaft (22), on which a first idler wheel (221) is connected. The first idler wheel (221) is located between the first gear (121) and the second gear (181). The first idler wheel (221) meshes with the first gear (121) and the second gear (181) respectively.

7. The power system as described in claim 3, characterized in that, The second gear (181) is fixedly connected to the transmission shaft (18), and the third gear (182) is loosely fitted on the transmission shaft (18). The power system also includes a first shifting mechanism (19), which is connected to the transmission shaft (18). The first shifting mechanism (19) includes a first station and a second station. When the first shifting mechanism (19) is in the first working position, the third gear (182) rotates idling relative to the transmission shaft (18); When the first shifting mechanism (19) is in the second working position, the third gear (182) is engaged with the transmission shaft (18).

8. The power system as described in claim 7, characterized in that, The output end of the planetary carrier (162) is connected to a first driving gear (1622) and a second driving gear (1623). A first driven gear (131) and a second driven gear (132) are loosely fitted on the second output shaft (13). The first driving gear (1622) meshes with the first driven gear (131), and the second driving gear (1623) meshes with the second driven gear (132). The power system also includes a second shifting mechanism (21), which is connected to the second output shaft (13). The second shifting mechanism (21) includes a third station, a fourth station, and a fifth station. When the second shifting mechanism (21) is in the third position, the first driven gear (131) and the second driven gear (132) rotate freely relative to the second output shaft (13); When the second shifting mechanism (21) is in the fourth position, the first driven gear (131) is engaged with the second output shaft (13), and the second driven gear (132) rotates freely relative to the second output shaft (13); When the second shifting mechanism (21) is in the fifth position, the second driven gear (132) is engaged with the second output shaft (13), and the first driven gear (131) rotates idling relative to the second output shaft (13).

9. The power system according to any one of claims 1 to 8, characterized in that, A fifth gear (152) is connected to the second power shaft (151) of the second motor (15), and a drive tooth (1611) is provided at the input end of the sun gear (161), the drive tooth (1611) being connected to the fifth gear (152); and / or, The power system also includes a second inertial shaft (23), on which a second idler wheel (231) is connected. The second idler wheel (231) is located between the fifth gear (152) and the drive gear (1611), and the second idler wheel (231) meshes with the fifth gear (152) and the drive gear (1611) respectively.

10. An agricultural machine, characterized in that, Includes the power system described in any one of claims 1 to 9.

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