Longitudinally-arranged two-gear driving system

Abstract

The utility model relates to a longitudinally-arranged two-gear driving system which comprises an engine, a torsion damper, an input shaft, an intermediate shaft, a power generator, a clutch assembly, a driving motor, a bevel gear driving shaft and a differential mechanism assembly. The input shaft is connected with the torsion damper, the intermediate shaft and the clutch assembly, the generator is connected with the first gear through the intermediate shaft, the clutch assembly is constantly meshed with the second gear of the input shaft, and the clutch assembly can be controlled to be connected with a first clutch combination point or a second clutch combination point of the clutch assembly. The driving motor is connected with the bevel gear driving shaft through a clutch assembly. The precious space in the transmission case is released by shortening the bevel gear driving shaft, and the space utilization efficiency is improved; the shortened shaft design is beneficial to reducing the overall weight and improving the energy efficiency and the acceleration performance of the vehicle; the optimized design reduces the vibration of the transmission system, improves the NVH characteristics, and improves the riding experience.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle drive systems, and in particular to a two-speed drive system with a longitudinal layout. Background Art

[0002] In the design of existing electric vehicle and hybrid vehicle drive systems, the two-speed drive system with a longitudinal layout is an important part for improving energy utilization efficiency and expanding the vehicle driving performance range. Usually, a bevel gear drive shaft is included in the transmission case of such systems, which is used to adjust the output torque and speed to adapt to different driving conditions. The bevel gear drive shaft is responsible for transmitting power between the clutch, the drive motor and the differential. However, in order to match the overall layout of the transmission case and meet the requirements of transmission ratio transformation, the bevel gear drive shaft is often designed to be relatively long, which increases the complexity and volume of the system to a certain extent.

[0003] Currently, the two-speed drive system with a longitudinal layout has the following technical problems:

[0004] 1. Space Occupancy: The overly long bevel gear drive shaft occupies too much internal space of the transmission case, restricting the arrangement of the clutch shaft, the drive motor or other key components.

[0005] 2. Bending Stress: The long shaft bears a large bending stress when transmitting torque, increasing the risk of fatigue damage and affecting the system life.

[0006] 3. Weight Increase: The long shaft design leads to more material usage, increasing the system weight and affecting the energy consumption efficiency and dynamic performance of the vehicle.

[0007] 4. Vibration and Noise: The long shaft is prone to generating vibration and noise, affecting the ride comfort and the vehicle NVH performance. Summary of the Utility Model

[0008] In view of this, the utility model provides a two-speed drive system with a longitudinal layout, which releases the precious space in the transmission case and improves the space utilization efficiency by shortening the length of the bevel gear drive shaft.

[0009] The two-speed drive system with a longitudinal layout provided by the utility model adopts the following technical solutions:

[0010] A two-speed drive system with a longitudinal layout, comprising an engine, a torsional damper, an input shaft, an intermediate shaft, a generator, a clutch assembly, a drive motor, a bevel gear drive shaft, and a differential assembly; the torsional damper is coaxially and fixedly arranged with the crankshaft of the engine, the input shaft is provided with an input shaft first gear and an input shaft second gear, the input shaft is connected to the torsional damper, the intermediate shaft, and the clutch assembly, the generator is connected to the first gear through the intermediate shaft, the clutch assembly is constantly meshed with the input shaft second gear, the clutch assembly has a clutch first engagement point or a clutch second engagement point, and the clutch assembly can be manipulated to engage with the clutch first engagement point or the clutch second engagement point, so that the clutch assembly engages with the bevel gear drive shaft at different speed ratios, and the drive motor is connected to the bevel gear drive shaft through the clutch assembly.

[0011] Optionally, a bevel gear drive shaft second gear is arranged on the bevel gear drive shaft, and the drive motor is constantly meshed with the bevel gear drive shaft second gear.

[0012] Optionally, the bevel gear drive shaft second gear is located in the middle of the bevel gear drive shaft.

[0013] Optionally, the differential assembly is provided with a main reduction gear, the bevel gear drive shaft is provided with a bevel gear drive shaft fourth gear, and the bevel gear drive shaft fourth gear meshes with the main reduction gear.

[0014] Optionally, the input shaft is constantly meshed with the intermediate shaft, and the intermediate shaft is constantly meshed with the generator output shaft.

[0015] Optionally, the generator has a generator output shaft for transmitting the power of the generator to the intermediate shaft, the drive motor has a motor drive shaft and a motor output shaft, and the motor drive shaft transmits the power to the bevel gear drive shaft through the motor output shaft.

[0016] Optionally, a clutch first gear and a clutch shaft are arranged on the clutch assembly, and the intermediate shaft is constantly meshed with the clutch first gear for transmitting power to the clutch shaft.

[0017] Optionally, a clutch second gear and a clutch third gear are arranged on the clutch assembly, and the clutch second gear and the clutch third gear can be manipulated to be selectively connected to the clutch shaft.

[0018] Optionally, a bevel gear drive shaft third gear is arranged on the bevel gear drive shaft, and the clutch third gear is constantly meshed with the bevel gear drive shaft third gear.

[0019] In summary, the present utility model includes at least one of the following beneficial technical effects: by shortening the length of the bevel gear drive shaft, valuable space inside the transmission case is released, improving space utilization efficiency; the structural optimization reduces the bending stress of the bevel gear drive shaft, enhancing the reliability and durability of the transmission system; the shortened shaft design helps to reduce the overall weight, improving the vehicle's energy efficiency and acceleration performance; the optimized design reduces the vibration of the transmission system, improving the NVH characteristics and enhancing the riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.

[0022] Description of the reference numerals: 1, engine; 2, torsional damper; 3, first gear of the input shaft; 4, second gear of the input shaft; 5, intermediate shaft; 6, generator output shaft; 7, generator; 8, first gear of the clutch; 9, second gear of the clutch; 10, first engagement point of the clutch; 11, clutch assembly; 12, second engagement point of the clutch; 13, third gear of the clutch; 14, clutch shaft; 15, drive motor; 16, motor drive shaft; 17, first gear of the bevel gear drive shaft; 18, bevel gear drive shaft; 19, motor output shaft; 20, second gear of the bevel gear drive shaft; 21, third gear of the bevel gear drive shaft; 22, fourth gear of the bevel gear drive shaft; 23, differential assembly; 24, main reduction gear; 25, input shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following uses specific specific examples to illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0024] The following will further elaborate on the present utility model in conjunction with the attached Figure 1 for a more detailed description.

[0025] An embodiment of the present utility model discloses a two-speed drive system with a longitudinal layout.

[0026] Refer to Figure 1, A two-speed drive system with a longitudinal layout includes an engine 1, a torsional damper 2, an input shaft 25, an intermediate shaft 5, a generator 7, a clutch assembly 11, a drive motor 15, a bevel gear drive shaft 18, and a differential assembly 23; the torsional damper 2 is coaxially and fixedly arranged with the crankshaft of the engine 1. The input shaft 25 is provided with an input shaft first gear 3 and an input shaft second gear 4. The input shaft 25 is connected to the torsional damper 2, the intermediate shaft 5, and the clutch assembly 11. The generator 7 is connected to the first gear through the intermediate shaft 5. The clutch assembly 11 is constantly meshed with the input shaft second gear 4. The clutch assembly 11 has a clutch first engagement point 10 or a clutch second engagement point 12. The clutch assembly 11 can be manipulated to engage with the clutch first engagement point 10 or the clutch second engagement point 12, so that the clutch assembly 11 engages with the bevel gear drive shaft 18 at different speed ratios. The drive motor 15 is connected to the bevel gear drive shaft 18 through the clutch assembly 11. By shortening the length of the bevel gear drive shaft 18, valuable space in the transmission case is released, and the space utilization efficiency is improved; the structural optimization reduces the bending stress of the bevel gear drive shaft 18, improving the reliability and durability of the drive system; the shortened shaft design helps to reduce the overall weight, enhancing the vehicle's energy efficiency and acceleration performance; the optimized design reduces the vibration of the drive system, improves the NVH characteristics, and enhances the riding experience.

[0027] In this embodiment, the torsional damper 2 is coaxially arranged with the crankshaft of the engine 1, and the torsional damper 2 and the crankshaft of the engine 1 are fixed by bolts. The generator 7 is connected to the input shaft first gear 3 through the intermediate shaft 5. The clutch assembly 11 is constantly meshed with the input shaft second gear 4. The clutch assembly 11 can be manipulated to engage the clutch first engagement point 10 with the clutch second engagement point 12, so that the clutch assembly 11 engages with the bevel gear drive shaft 18 at different speed ratios, achieving the purpose of the engine 1 directly driving in two speeds.

[0028] The longitudinal two-speed drive system of the present utility model can achieve the engine 1 directly driving in two speeds, reduce the length and stress deformation of the bevel gear drive shaft 18, and enhance the stiffness of the bevel gear drive shaft 18.

[0029] The clutch assembly 11 is provided with a clutch first gear 8 and a clutch shaft 14. The intermediate shaft 5 is constantly meshed with the clutch first gear 8 for transmitting power to the clutch shaft 14.

[0030] The bevel gear drive shaft 18 is provided with a bevel gear drive shaft second gear 20. The drive motor 15 is constantly meshed with the bevel gear drive shaft second gear 20.

[0031] The bevel gear drive shaft second gear 20 is located in the middle of the bevel gear drive shaft 18. The drive motor 15 is connected to the bevel gear drive shaft 18 in the middle of the clutch assembly 11, reducing the length and stress deformation of the bevel gear drive shaft 18 and enhancing the stiffness of the bevel gear drive shaft 18.

[0032] The clutch assembly 11 is provided with a second clutch gear 9 and a third clutch gear 13, and the second clutch gear 9 and the third clutch gear 13 can be operatively connected to the clutch shaft 14 selectively.

[0033] The bevel gear drive shaft 18 is provided with a third bevel gear drive shaft gear 21, and the third clutch gear 13 is constantly meshed with the third bevel gear drive shaft gear 21.

[0034] The differential assembly 23 is provided with a main reduction gear 24, the bevel gear drive shaft 18 is provided with a fourth bevel gear drive shaft gear 22, the fourth bevel gear drive shaft gear 22 is meshed with the main reduction gear 24, the input shaft 25 is constantly meshed with the intermediate shaft 5, and the intermediate shaft 5 is constantly meshed with the generator output shaft 6.

[0035] The generator 7 has a generator output shaft 6, and the generator output shaft 6 is used to transmit the power of the generator 7 to the intermediate shaft 5. The drive motor 15 has a motor drive shaft 16 and a motor output shaft 19, and the motor drive shaft 16 transmits the power to the bevel gear drive shaft 18 through the motor output shaft 19.

[0036] In this embodiment, the input shaft 25 is constantly meshed with the intermediate shaft 5 and the clutch assembly 11, the intermediate shaft 5 is constantly meshed with the generator 7. According to the vehicle operating conditions, the generator 7 selects two modes of generating electricity or not generating electricity. The intermediate shaft 5 is constantly meshed with the first clutch gear 8 of the clutch assembly 11 to transmit the power to the clutch shaft 14. The second clutch gear 9 of the clutch assembly 11 is constantly meshed with the first bevel gear drive shaft gear 17, the third clutch gear 13 is constantly meshed with the third bevel gear drive shaft gear 21, and the second clutch gear 9 and the third clutch gear 13 are selectively connected to the clutch shaft 14. By changing the first clutch engagement point 10 and the second clutch engagement point 12, the connection between the clutch assembly 11 and the bevel gear drive shaft 18 is realized. The fourth bevel gear drive shaft gear 22 is constantly meshed with the main reduction gear 24 of the differential assembly 23 to realize the direct drive function of the engine 1 in two different gears; the drive motor 15 is constantly meshed with the second bevel gear drive shaft gear 20, and the second bevel gear drive shaft gear 20 is located in the middle of the bevel gear drive shaft 18. According to the vehicle operating conditions, the drive motor 15 selects two modes of driving or not driving;

[0037] By setting the input shaft 25 to be constantly meshed with the intermediate shaft 5, and the intermediate shaft 5 to be constantly meshed with the generator 7, the power generation condition is realized; by setting the engagement states of the clutch second gear 9 and the clutch third gear 13 with the clutch shaft 14, the direct drive function of the engine 1 in two different gears is realized; the drive motor 15 is constantly meshed with the bevel gear drive shaft second gear 20, and the bevel gear drive shaft second gear 20 is located in the middle of the bevel gear drive shaft 18, reducing the bending stress of the bevel gear drive shaft 18, shrinking the size of the power system, and improving the structural compactness of the power system, thereby realizing the lightweight and compactness of the product.

[0038] The utility model has spatial optimization: by shortening the length of the bevel gear drive shaft 18, valuable space in the transmission box is released, improving the space utilization efficiency; stress reduction: the structural optimization reduces the bending stress of the bevel gear drive shaft 18, improving the reliability and durability of the transmission system; lightweight: the shortened shaft design helps to reduce the overall weight, improving the vehicle energy efficiency and acceleration performance; vibration and noise reduction: the optimized design reduces the vibration of the transmission system, improves the NVH characteristics, and enhances the riding experience.

[0039] The innovative layout and geometric shape design of the bevel gear drive shaft 18 of the utility model realizes the efficient reduction of the length of the bevel gear drive shaft 18 through a non-linear axial shortening strategy or an integrated gear component design, while ensuring that the transmission efficiency is not affected.

[0040] The specific structural design for shortening the bevel gear drive shaft 18 of the utility model, the new connection method between the bevel gear drive shaft 18 and the surrounding components, and the special material or surface treatment technology for reducing the bending stress.

[0041] The integrated design of the multi-stage reducer of the utility model: by integrating the multi-stage reducer in the drive system, the requirement for the length of the bevel gear drive shaft 18 is reduced, but the system complexity may increase.

[0042] The application of lightweight materials such as carbon fiber in the utility model: Although it cannot directly shorten the length of the bevel gear drive shaft 18, it can reduce the weight and alleviate some problems caused by the long shaft.

[0043] Specific examples are used in this article to elaborate on the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model. The above is only the preferred implementation method of the utility model. It should be noted that due to the limited nature of written expression and objectively existing infinite specific structures, for those of ordinary skill in the art, without departing from the principle of the utility model, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the utility model to other occasions without improvement, shall be regarded as the protection scope of the utility model.

Claims

1. A two-speed drive system with a longitudinal layout, characterized in that: The invention comprises an engine (1), a torsional vibration damper (2), an input shaft (25), an intermediate shaft (5), a generator (7), a clutch assembly (11), a drive motor (15), a bevel gear drive shaft (18) and a differential assembly (23); the torsional vibration damper (2) is coaxially fixedly arranged with the crankshaft of the engine (1); the input shaft (25) is provided with an input shaft first gear (3) and an input shaft second gear (4); the input shaft (25) is connected to the torsional vibration damper (2), the intermediate shaft (5) and the clutch assembly (11); the generator (7 ... The intermediate shaft (5) is connected to the first gear (3), the clutch assembly (11) is constantly meshed with the second gear (4) of the input shaft, the clutch assembly (11) has a first clutch engagement point (10) or a second clutch engagement point (12), the clutch assembly (11) can be manipulated to engage with the first clutch engagement point (10) or the second clutch engagement point (12), so that the clutch assembly (11) is engaged with the bevel gear drive shaft (18) at different speed ratios, and the drive motor (15) is connected to the bevel gear drive shaft (18) via the clutch assembly (11).

2. The longitudinally arranged two-speed drive system according to claim 1, characterized in that: The bevel gear drive shaft (18) is provided with a bevel gear drive shaft second gear (20), and the drive motor (15) is constantly meshed with the bevel gear drive shaft second gear (20).

3. The longitudinally arranged two-speed drive system according to claim 2, characterized in that: The second gear (20) of the bevel gear drive shaft is located in the middle of the bevel gear drive shaft (18).

4. The longitudinally arranged two-speed drive system according to claim 1, characterized in that: The differential assembly (23) is provided with a main reduction gear (24), and the bevel gear drive shaft (18) is provided with a bevel gear drive shaft fourth gear (22), and the bevel gear drive shaft fourth gear (22) is meshed with the main reduction gear (24).

5. The longitudinally arranged two-speed drive system according to claim 4, characterized in that: The input shaft (25) is constantly meshed with the intermediate shaft (5), and the intermediate shaft (5) is constantly meshed with the generator output shaft (6).

6. The longitudinally arranged two-speed drive system according to claim 5, characterized in that: The generator (7) has a generator output shaft (6), and the generator output shaft (6) is used to transmit the power of the generator (7) to the intermediate shaft (5). The drive motor (15) has a motor transmission shaft (16) and a motor output shaft (19), and the motor transmission shaft (16) transmits the power to the bevel gear drive shaft (18) through the motor output shaft (19).

7. The longitudinally arranged two-speed drive system according to claim 1, characterized in that: The clutch assembly (11) is provided with a clutch first gear (8) and a clutch shaft (14), and the intermediate shaft (5) is constantly meshed with the clutch first gear (8) for transmitting power to the clutch shaft (14).

8. The longitudinally arranged two-speed drive system according to claim 7, characterized in that: The clutch assembly (11) is provided with a clutch second gear (9) and a clutch third gear (13), and the clutch second gear (9) and the clutch third gear (13) can be manipulated to be selectively connected to the clutch shaft (14).

9. The longitudinally arranged two-speed drive system according to claim 8, characterized in that: The bevel gear drive shaft (18) is provided with a bevel gear drive shaft third gear (21), and the clutch third gear (13) is constantly meshed with the bevel gear drive shaft third gear (21).

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