Four-gear gearbox for automobile

Abstract

The four-gear gearbox comprises a differential mechanism assembly, a first power transmission mechanism, a second power transmission mechanism, a first synchronizer, a second synchronizer, a planet row, a brake and a first gear, a first component of the planet row is connected with an input shaft, and a second component of the planet row is connected with the first gear. The brake is arranged to be used for braking a third component of the planet row, the first synchronizer is arranged to be used for controlling the first power transmission mechanism to be switched between the power transmission state and the power interruption state, and the second synchronizer is arranged to be used for controlling the second power transmission mechanism to be switched between the power transmission state and the power interruption state. The first power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism, and the second power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism. According to the four-gear gearbox for the automobile, through cooperation of the power transmission mechanism, the synchronizer, the brake and the planet row, four-gear power output can be achieved, the problem of gear shifting interruption of the gearbox can be avoided, and the dynamic property of the whole automobile is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gearboxes, and in particular to a four-speed gearbox for an automobile. Background Art

[0002] As the car ownership rate continues to increase, gearboxes that replace traditional car gearboxes are also developing rapidly. In order to improve the efficiency and power of the whole vehicle, the demand for multi-speed gearboxes is getting higher and higher. Multi-speed gearboxes can provide the power required by the whole vehicle under different working conditions and different speeds, but multi-speed gearboxes still have problems such as power interruption, which reduces the power and comfort of the whole vehicle.

[0003] The Chinese patent application number 202411182732.7 discloses a transmission. The transmission includes a power drive mechanism, a first gear, a second gear set, a third gear, a fourth gear and a first motor or an engine, the power drive mechanism includes an engine and the output end of the power drive mechanism is connected to the first gear in a transmission manner, the first motor or the engine is connected to the third gear in a transmission manner; the first gear and the third gear are both meshed with the second gear set in a transmission manner, the second gear set is meshed with the fourth gear in a transmission manner, and the fourth gear is connected to the front axle differential.

[0004] It is hoped to provide a four-speed gearbox for an automobile, in particular, how to avoid the problem of transmission shift interruption and improve the power of the entire vehicle. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a four-speed gearbox for a vehicle, the purpose of which is to avoid the problem of gear shift interruption and improve the power of the whole vehicle.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a four-speed gearbox for a car, including a power output mechanism, a first power transmission mechanism, a second power transmission mechanism, a first synchronizer, a second synchronizer, a clutch, a planetary gear, a brake and a first gear, the first component of the planetary gear is connected to the input shaft, the second component of the planetary gear is connected to the first gear, the brake is configured to brake the third component of the planetary gear, the clutch is configured to control the combination and separation between the first component and the third component of the planetary gear, the first synchronizer is configured to control the first power transmission mechanism to switch between a power transmission state and a power interruption state, the second synchronizer is configured to control the second power transmission mechanism to switch between a power transmission state and a power interruption state, the first power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism, and the second power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism.

[0007] The first component is a ring gear of the planetary gear train, the second component is a planet carrier of the planetary gear train, and the third component is a sun gear of the planetary gear train.

[0008] The first power transmission mechanism includes a first intermediate shaft and a second gear idler on the first intermediate shaft, the first synchronizer is configured to control power transmission and interruption between the second gear and the first intermediate shaft, and the second gear is meshed with the first gear.

[0009] The first power transmission mechanism further includes a third gear disposed on the first intermediate shaft, and the third gear is meshed with a fourth gear disposed on the power output mechanism.

[0010] The first synchronizer is located between the second gear and the third gear.

[0011] The second power transmission mechanism includes a second intermediate shaft and a fifth gear idler on the second intermediate shaft, the second synchronizer is configured to control power transmission and interruption between the fifth gear and the second intermediate shaft, and the fifth gear is meshed with the first gear.

[0012] The second power transmission mechanism further includes a sixth gear disposed on the second intermediate shaft, and the sixth gear is meshed with a fourth gear disposed on the power output mechanism.

[0013] The second synchronizer is located between the fifth gear and the sixth gear.

[0014] The first intermediate shaft is parallel to the second intermediate shaft.

[0015] The present invention is used for a four-speed gearbox of an automobile, and can realize four-speed power output through the cooperation of a power transmission mechanism, a synchronizer, a brake and a planetary gear, thereby avoiding the problem of gear shift interruption of the transmission and improving the power of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] This specification includes the following drawings, which show the following contents:

[0017] Figure 1 It is the overall structural diagram of the four-speed gearbox of the present invention used for automobile;

[0018] Figure 2 The present invention is a first-gear power flow diagram of a four-gear transmission for an automobile;

[0019] Figure 3 The present invention is a second-gear power flow diagram of a four-gear transmission for an automobile;

[0020] Figure 4The present invention is a three-speed power flow diagram of a four-speed gearbox for an automobile;

[0021] Figure 5 The present invention is a four-speed power flow diagram of a four-speed gearbox for an automobile;

[0022] Markings in the figure are: 1. first gear; 2. second gear; 3. third gear; 4. fourth gear; 5. fifth gear; 6. sixth gear; 7. first synchronizer; 8. second synchronizer; 9. brake; 10. planetary gear; 11. first intermediate shaft; 12. second intermediate shaft; 13. output shaft; 14. input shaft; 15. drive motor or engine; 16. clutch. DETAILED DESCRIPTION

[0023] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0024] It should be noted that, in the following embodiments, the "first", "second", "third", "fourth", "fifth" and "sixth" do not represent an absolute distinction in structure and / or function, nor do they represent a sequence of execution, but are merely for the convenience of description.

[0025] like Figures 1 to 5 As shown, the present invention provides a four-speed gearbox for a vehicle, comprising a power output mechanism, a first power transmission mechanism, a second power transmission mechanism, a first synchronizer 7, a second synchronizer 8, a planetary gear 10, a clutch, a brake 9 and a first gear 1, wherein the first component of the planetary gear 10 is connected to the input shaft 14, the second component of the planetary gear 10 is connected to the first gear 1, the brake 9 is configured to brake the third component of the planetary gear 10, the clutch is connected to the first component and the third component of the planetary gear 10, the clutch is configured to control the combination and separation between the first component and the third component of the planetary gear 10, the first synchronizer 7 is configured to control the first power transmission mechanism to switch between a power transmission state and a power interruption state, the second synchronizer 8 is configured to control the second power transmission mechanism to switch between a power transmission state and a power interruption state, the first power transmission mechanism in the power transmission state transmits the power from the first gear 1 to the power output mechanism, and the second power transmission mechanism in the power transmission state transmits the power from the first gear 1 to the power output mechanism.

[0026] Specifically, if Figure 1As shown, the planetary gear 10 includes a sun gear, a ring gear, a planet carrier and planetary gears. The planetary gears are rotatably arranged on the planet carrier. A plurality of planetary gears are arranged. The planetary gears mesh with the sun gear, and the planetary gears mesh with the ring gear. In the embodiment of the present invention, the first component is the ring gear of the planetary gear 10, the second component is the planet carrier of the planetary gear 10, and the third component is the sun gear of the planetary gear 10. One end of the input shaft 14 is coaxially fixedly connected with the ring gear, and the other end of the input shaft 14 is connected to the power source, which is a driving motor or an engine 15. The clutch is connected to the first component and the third component of the planetary gear 10, and the clutch is configured to control the combination and separation between the first component and the third component of the planetary gear 10. One end of the clutch is connected to the input shaft 14 and the first component of the planetary gear 10, and the other end of the clutch is connected to the third component of the planetary gear 10. When the clutch is in the engaged state, the first component and the third component of the planetary gear 10 are firmly connected together, and the power of the input shaft 14 is transmitted to the first component and the third component of the planetary gear 10 through the clutch, and the first component and the third component of the planetary gear 10 rotate synchronously. When the clutch is in the disengaged state, the power connection between the first component and the third component of the planetary gear 10 is cut off, and the power of the input shaft 14 can only be transmitted to the first component of the planetary gear 10 through the clutch.

[0027] The first gear 1 is coaxially fixedly connected to the planet carrier, and the first gear 1 can selectively transmit power to the first power transmission mechanism and the second power transmission mechanism, and then the first power transmission mechanism or the second power transmission mechanism transmits the power to the power output mechanism. This structure of the planetary gear 10 can flexibly adjust the distribution and transmission of power according to different working conditions and shifting requirements. During the shifting process, the planetary gear 10 can cooperate with the first power transmission mechanism and the second power transmission mechanism. For example, when the first power transmission mechanism is shifting, the planetary gear 10 can adjust its internal power transmission relationship (such as controlling the state of the sun gear through the brake 9) so that the entire power system can maintain power continuity at the moment of shifting, and assist in achieving shifting without power interruption.

[0028] like Figure 1As shown, the first power transmission mechanism includes a first intermediate shaft 11 and a second gear 2 which is loosely mounted on the first intermediate shaft 11. The first synchronizer 7 is configured to control the power transmission and interruption between the second gear 2 and the first intermediate shaft 11, and the second gear 2 is meshed with the first gear 1. The first synchronizer 7 is disposed on the first intermediate shaft 11. When the first synchronizer 7 is meshed with the second gear 2, the second gear 2 rotates synchronously with the first intermediate shaft 11 through the first synchronizer 7, and the second gear 2 transmits power to the first intermediate shaft 11. At this time, the first power transmission mechanism is in a power transmission state. When the first synchronizer 7 is separated from the second gear 2, the second gear 2 and the first intermediate shaft 11 cannot rotate synchronously. At this time, the first power transmission mechanism is in a power interruption state, and the first power transmission mechanism cannot transmit power to the power output mechanism.

[0029] like Figure 1 As shown, the first power transmission mechanism further includes a third gear 3 disposed on the first intermediate shaft 11 , the third gear 3 is meshed with a fourth gear 4 disposed on the power output mechanism, and the third gear 3 is coaxially fixedly connected to the first intermediate shaft 11 .

[0030] like Figure 1 As shown, in the embodiment of the present invention, the first synchronizer 7 is located between the second gear 2 and the third gear 3 .

[0031] The second power transmission mechanism includes a second intermediate shaft 12 and a fifth gear 5 which is loosely mounted on the second intermediate shaft 12. The second synchronizer 8 is configured to control the power transmission and interruption between the fifth gear 5 and the second intermediate shaft 12. The fifth gear 5 is meshed with the first gear 1. The second synchronizer 8 is disposed on the second intermediate shaft 12. When the second synchronizer 8 is meshed with the fifth gear 5, the fifth gear 5 rotates synchronously with the second intermediate shaft 12 through the second synchronizer 8. The fifth gear 5 transmits power to the second intermediate shaft 12. At this time, the second power transmission mechanism is in a power transmission state. When the second synchronizer 8 is separated from the fifth gear 5, the fifth gear 5 cannot rotate synchronously with the second intermediate shaft 12. At this time, the second power transmission mechanism is in a power interruption state, and the second power transmission mechanism cannot transmit power to the power output mechanism.

[0032] like Figure 1 As shown, the second power transmission mechanism further includes a sixth gear 6 disposed on the second intermediate shaft 12 , the sixth gear 6 is meshed with the fourth gear 4 disposed on the power output mechanism, and the sixth gear 6 and the second intermediate shaft 12 are coaxially fixedly connected.

[0033] like Figure 1 As shown, in the embodiment of the present invention, the second synchronizer 8 is located between the fifth gear 5 and the sixth gear 6 .

[0034] like Figure 1As shown, in the embodiment of the present invention, the first intermediate shaft 11 is parallel to the second intermediate shaft 12 , the first intermediate shaft 11 is supported by two bearings, and the second intermediate shaft 12 is also supported by two bearings.

[0035] like Figure 1 As shown, the power output mechanism includes an output shaft 13 and a fourth gear 4 arranged on the output shaft 13. The output shaft 13 is parallel to the first intermediate shaft 11 and the second intermediate shaft 12. The output shaft 13 is supported by two bearings.

[0036] In the embodiment of the present invention, the first synchronizer 7 and the second synchronizer 8 are used to control the power transmission and interruption in the first power transmission mechanism and the second power transmission mechanism respectively. When the synchronizer is in a certain position, it can ensure that the power transmission between the relevant gears and the shaft is continuous, and when the synchronizer moves to another position, it can interrupt such power transmission. The synchronizer can switch from one gear to another without interrupting the power flow of the entire transmission system. This is because during the gear shifting process, one synchronizer can control the power transmission of the current gear, while the other synchronizer prepares the power transmission of the next gear.

[0037] The first power transmission mechanism and the second power transmission mechanism both include gears (the second gear 2 and the fifth gear 5) that are loosely mounted on the shaft, and these gears are connected or disconnected with the shaft through synchronizers. This design allows one gear to remain connected to the shaft while the other gear is ready to be connected to the shaft during gear shifting, thereby achieving seamless gear shifting.

[0038] During a gear shift, such as from first gear to second gear, the first synchronizer 7 can gradually interrupt the power transmission in the first power transmission mechanism, while the second synchronizer 8 prepares and starts the power transmission in the second power transmission mechanism. Since both power transmission mechanisms are connected to the same input source and the same output, gear switching can be achieved without interrupting the power flow of the entire transmission system. This design allows the vehicle's power and speed to be maintained during the gear shift, thereby improving the smoothness and comfort of driving.

[0039] like Figure 2 As shown, when the gearbox works in the first gear, the brake 9 is closed, the first synchronizer 7 is engaged with the second gear 2, the first power transmission mechanism is in the power transmission state, the clutch is in the disengaged state, the power of the input shaft 14 is transmitted to the ring gear of the planetary row 10, and after the power increases the speed ratio from the planetary row 10, the power is transmitted from the first gear 1 to the second gear 2, and the second gear 2 drives the third gear 3 to rotate synchronously through the first intermediate shaft 11, and then the power is transmitted from the third gear 3 to the fourth gear 4, and the power is output through the output shaft 13 to achieve the first gear ratio.

[0040] like Figure 3As shown, when the gearbox works in the second gear, the brake 9 is closed, the second synchronizer 8 is engaged with the fifth gear 5, the second power transmission mechanism is in the power transmission state, the clutch is in the disengaged state, the power of the input shaft 14 is transmitted to the ring gear of the planetary row 10, and after the power increases the speed ratio from the planetary row 10, the power is transmitted from the first gear 1 to the fifth gear 5, and the fifth gear 5 drives the sixth gear 6 to rotate synchronously through the second intermediate shaft 12, and then the power is transmitted from the sixth gear 6 to the fourth gear 4, and the power is output through the output shaft 13 to achieve a 2nd gear ratio.

[0041] like Figure 4 As shown, when the gearbox works in the third gear, the brake 9 is turned on, the brake 9 brakes the sun gear, the clutch is in a coupled state, the ring gear and the sun gear cannot rotate relative to each other, the second synchronizer 8 is engaged with the fifth gear 5, the second power transmission mechanism is in a power transmission state, the power of the input shaft 14 is transmitted to the planetary row 10, the power is transmitted from the planetary row 10 to the first gear 1, and then the power is transmitted from the first gear 1 to the fifth gear 5, the fifth gear 5 drives the sixth gear 6 to rotate synchronously through the second intermediate shaft 12, and then the power is transmitted from the sixth gear 6 to the fourth gear 4, and the power is output through the output shaft 13 to achieve a 3rd gear ratio.

[0042] like Figure 3 As shown, when the gearbox works in the fourth gear, the brake 9 is turned on, the clutch is in the engaged state, the ring gear and the sun gear cannot rotate relative to each other, the first synchronizer 7 is engaged with the second gear 2, the first power transmission mechanism is in the power transmission state, the power of the input shaft 14 is transmitted to the planetary row 10, the power is transmitted from the planetary row 10 to the first gear 1, and then the power is transmitted from the first gear 1 to the second gear 2, the second gear 2 drives the third gear 3 to rotate synchronously through the first intermediate shaft 11, and then the power is transmitted from the third gear 3 to the fourth gear 4, and the power is output through the output shaft 13 to achieve a 4th gear ratio.

[0043] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A four-speed gearbox for an automobile, characterized in that: It includes a power output mechanism, a first power transmission mechanism, a second power transmission mechanism, a first synchronizer, a second synchronizer, a clutch, a planetary gear, a brake and a first gear. The first component of the planetary gear is connected to the input shaft, the second component of the planetary gear is connected to the first gear, the brake is configured to brake the third component of the planetary gear, the clutch is configured to control the engagement and separation between the first component and the third component of the planetary gear, the first synchronizer is configured to control the first power transmission mechanism to switch between a power transmission state and a power interruption state, the second synchronizer is configured to control the second power transmission mechanism to switch between a power transmission state and a power interruption state, the first power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism, and the second power transmission mechanism in the power transmission state transmits power from the first gear to the power output mechanism.

2. The four-speed gearbox for automobiles according to claim 1, characterized in that: The first component is a ring gear of the planetary gear train, the second component is a planet carrier of the planetary gear train, and the third component is a sun gear of the planetary gear train.

3. The four-speed gearbox for automobiles according to claim 1, characterized in that: The first power transmission mechanism includes a first intermediate shaft and a second gear idler on the first intermediate shaft, the first synchronizer is configured to control power transmission and interruption between the second gear and the first intermediate shaft, and the second gear is meshed with the first gear.

4. The four-speed gearbox for automobiles according to claim 3, characterized in that: The first power transmission mechanism further includes a third gear disposed on the first intermediate shaft, and the third gear is meshed with a fourth gear disposed on the power output mechanism.

5. The four-speed gearbox for automobiles according to claim 4, characterized in that: The first synchronizer is located between the second gear and the third gear.

6. The four-speed gearbox for automobile according to any one of claims 3 to 5, characterized in that: The second power transmission mechanism includes a second intermediate shaft and a fifth gear idler on the second intermediate shaft, the second synchronizer is configured to control power transmission and interruption between the fifth gear and the second intermediate shaft, and the fifth gear is meshed with the first gear.

7. The four-speed gearbox for automobiles according to claim 6, characterized in that: The second power transmission mechanism further includes a sixth gear disposed on the second intermediate shaft, and the sixth gear is meshed with a fourth gear disposed on the power output mechanism.

8. The four-speed gearbox for automobiles according to claim 7, characterized in that: The second synchronizer is located between the fifth gear and the sixth gear.

9. The four-speed gearbox for automobiles according to claim 6, characterized in that: The first intermediate shaft is parallel to the second intermediate shaft.

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