A transmission structure and a transmission

Abstract

This invention provides a transmission structure and gearbox, which includes an inner input shaft and an outer input shaft that are coaxially and interlocked with the two output shafts of a dual-clutch transmission. The output shaft is coaxial with the inner input shaft, forming a longitudinal structure. An intermediate shaft is parallel to and spaced apart from the inner input shaft. Two gears are fixedly mounted on each of the outer and inner input shafts. One gear and a fixed synchronizer are movably mounted on the output shaft. Five gears and two synchronizers are correspondingly mounted on the intermediate shaft. This transmission structure and gearbox adjust the transmission configuration between the inner and outer input shafts using three synchronizers. The intermediate shaft can be used to achieve transmission between the inner and outer input shafts, increasing the number of configurable gears. This allows for a longitudinal gearbox design with six forward gears and one reverse gear through five sets of gears. Since only four gears are movably connected, their small proportion effectively improves overall transmission efficiency.

Description

Technical Field

[0001] This invention relates to the field of transmission technology, and in particular to a transmission structure and a transmission. Background Technology

[0002] Dual-clutch transmissions have advantages such as simple structure and manufacturing process, low cost, and high transmission efficiency, and are now widely used in the passenger vehicle field.

[0003] In the commercial vehicle sector, manual transmission vehicles still dominate. For example, mid-to-low-end pickup trucks on the market are typically equipped with 5MT (five-speed manual transmission) or 6MT (six-speed manual transmission), with a few equipped with 6AT (six-speed automatic transmission).

[0004] In the prior art, an eight-speed longitudinal dual-clutch transmission design (publication number: CN102352913A) is disclosed. It achieves eight forward gears and one reverse gear through four synchronizers and seven pairs of gear meshing. It has a large number of forward gears, but its structure is relatively complex, with a long longitudinal length, high cost, and a large number of gears that are movably connected to the shaft, resulting in low overall transmission efficiency. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a transmission structure and gearbox to solve the problems of long longitudinal length, numerous movable transmission gears, and low overall transmission efficiency in existing automatic gearboxes.

[0006] This invention provides a transmission structure comprising a dual clutch, an inner input shaft, an outer input shaft, an output shaft, and an intermediate shaft, wherein...

[0007] The inner input shaft and the outer input shaft are nested and coaxially arranged, and are respectively connected to the two output shafts of the dual clutch. The output shaft is coaxially arranged with the inner input shaft, and the intermediate shaft is parallel and spaced apart from the inner input shaft.

[0008] The outer input shaft is fixedly provided with a first gear and a second gear, and the inner input shaft is fixedly provided with a third gear and a fourth gear, with the fourth gear located at the end of the inner input shaft near the output shaft.

[0009] The intermediate shaft is movably equipped with a fifth gear, a sixth gear, and a seventh gear, and is fixedly equipped with an eighth gear and a ninth gear. The fifth gear is connected to the first gear via a reverse idler gear. The fifth gear and the sixth gear are selectively connected to the intermediate shaft via a first synchronizer. The sixth gear and the seventh gear are also selectively connected via a second synchronizer. The sixth gear, the seventh gear, and the eighth gear are respectively meshed with the second gear, the third gear, and the fourth gear.

[0010] A tenth gear is movably mounted on the output shaft, and a third synchronizer is fixedly mounted thereon. The tenth gear meshes with the ninth gear, and the tenth gear and the fourth gear are selectively connected to the output shaft via the third synchronizer.

[0011] Optionally, in reverse gear, the external input shaft is connected to the power source via the dual clutch, the first synchronizer connects the fifth gear to the intermediate shaft, the second synchronizer is idle, and the third synchronizer connects the tenth gear to the output shaft.

[0012] Optionally, in first gear, the external input shaft is connected to the power source via the dual clutch, the first synchronizer is idle, the second synchronizer connects the sixth gear and the seventh gear, and the third synchronizer connects the tenth gear to the output shaft.

[0013] Optionally, in second gear, the inner input shaft is connected to the power source via the dual clutch, the first synchronizer is idle, the second synchronizer is idle, and the third synchronizer connects the tenth gear to the output shaft.

[0014] Optionally, in the third gear state, the external input shaft is connected to the power source via the dual clutch, the first synchronizer connects the sixth gear to the intermediate shaft, the second synchronizer is idle, and the third synchronizer connects the tenth gear to the output shaft.

[0015] Optionally, in fourth gear, the external input shaft is connected to the power source via the dual clutch, the first synchronizer is idle, the second synchronizer connects the sixth gear and the seventh gear, and the third synchronizer connects the fourth gear and the output shaft.

[0016] Optionally, in the fifth gear state, the inner input shaft is connected to the power source via the dual clutch, the first synchronizer is idle, the second synchronizer is idle, and the third synchronizer connects the fourth gear to the output shaft.

[0017] Optionally, in the sixth gear mode, the external input shaft is connected to the power source via the dual clutch, the first synchronizer connects the sixth gear to the intermediate shaft, the second synchronizer is idle, and the third synchronizer connects the fourth gear to the output shaft.

[0018] The present invention also provides a transmission that includes the transmission structure described above.

[0019] The transmission structure provided by this invention includes a dual clutch, an inner input shaft, an outer input shaft, an output shaft, and an intermediate shaft. The inner and outer input shafts are nested and coaxially arranged, and are respectively connected to the two output shafts of the dual clutch. The output shaft is coaxially arranged with the inner input shaft, forming a longitudinal structure. The intermediate shaft is parallel to and spaced apart from the inner input shaft. A first gear and a second gear are fixedly arranged on the outer input shaft, and a third gear and a fourth gear are fixedly arranged on the inner input shaft, with the fourth gear positioned at the end of the inner input shaft near the output shaft. A fifth gear, a sixth gear, and a seventh gear are movably arranged on the intermediate shaft, and an eighth gear and a ninth gear are fixedly arranged. The fifth gear is connected to the first gear... The gears are connected via a reverse idler gear. The fifth and sixth gears are selectively connected to the intermediate shaft via a first synchronizer, and the sixth and seventh gears are also selectively connected via a second synchronizer. The sixth, seventh, and eighth gears mesh with the second, third, and fourth gears, respectively. The transmission from the outer input shaft to the inner input shaft can be achieved through the intermediate shaft, thus increasing the transmission ratio configuration and available gears using a limited number of gears. A tenth gear is movably mounted on the output shaft, meshing with the ninth gear, and the tenth and fourth gears are selectively connected to the output shaft via a third synchronizer. This transmission structure adjusts the transmission configuration between the inner input shaft, outer input shaft, intermediate shaft, and output shaft using three synchronizers, and can achieve transmission between the inner input shaft and outer input shaft using the intermediate shaft. It fully utilizes a limited number of gears to increase the number of available transmission ratio configurations and gears, thus achieving a longitudinally mounted transmission design with six forward gears and one reverse gear through five sets of gears. Only four gears are movably connected to the corresponding transmission shafts, representing a small proportion and effectively improving overall transmission efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of the transmission structure in this invention.

[0021] Explanation of reference numerals in the attached diagram: 10-Dual clutch, 21-External input shaft, 22-Internal input shaft, 23-Intermediate shaft, 24-Output shaft, 301-First gear, 302-Second gear, 303-Third gear, 304-Fourth gear, 305-Fifth gear, 306-Sixth gear, 307-Seventh gear, 308-Eighth gear, 309-Ninth gear, 310-Tenth gear, 311-Reverse idler gear, 41-First synchronizer, 42-Second synchronizer, 43-Third synchronizer.

[0022] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0023] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] To address the problems of long longitudinal length, numerous movable gear configurations, and low overall transmission efficiency in existing automatic transmissions, this invention provides a transmission structure. This structure includes an inner input shaft and an outer input shaft, which are coaxially nested and connected to the two output shafts of a dual-clutch transmission. The output shaft is coaxial with the inner input shaft, forming a longitudinal structure. An intermediate shaft is parallel to and spaced apart from the inner input shaft. Two gears are fixedly mounted on each of the outer and inner input shafts. One gear and a fixed synchronizer are movably mounted on the output shaft. The intermediate shaft has five gears and one or two synchronizers. This transmission structure and gearbox adjust the transmission configuration between the inner and outer input shafts using three synchronizers. The intermediate shaft can be used to achieve transmission between the inner and outer input shafts, increasing the number of configurable gears. This allows for a longitudinal transmission design with six forward gears and one reverse gear using five sets of gears. With only four movable gears, the overall transmission efficiency is significantly improved.

[0027] Specifically, such as Figure 1 The diagram shows the main structure of the transmission structure in this invention, which includes a dual clutch 10, an inner input shaft 22, an outer input shaft 21, an output shaft 24, and an intermediate shaft 23, as well as five sets of gears and three synchronizers mounted on each shaft, providing a longitudinal transmission configuration with six forward gears and one reverse gear.

[0028] The inner input shaft 22 and the outer input shaft 21 are nested and coaxially arranged, and are respectively connected to the two output shafts of the dual clutch 10 for transmission. The output shaft 24 is coaxially arranged with the inner input shaft 22, and the intermediate shaft 23 is arranged parallel to and spaced apart from the inner input shaft 22. The gear arrangement on the inner input shaft 22 and the outer input shaft 21 can be flexibly adjusted according to their length and specific transmission efficiency requirements.

[0029] A first gear 301 and a second gear 302 are fixedly mounted on the external input shaft 21. A third gear 303 and a fourth gear 304 are also fixedly mounted on the external input shaft 21. The fourth gear 304 is located at the end of the inner input shaft 22 near the output shaft 24, so that the fourth gear 304 can be directly connected to the output shaft for transmission through the third synchronizer 43.

[0030] A fifth gear 305, a sixth gear 306, and a seventh gear 307 are movably mounted on the intermediate shaft 23, while an eighth gear 308 and a ninth gear 309 are fixedly mounted. The fifth gear 305 is connected to the first gear 301 via a reverse idler gear 311. The fifth gear 305 and the sixth gear 306 are selectively connected to the intermediate shaft 23 via a first synchronizer 41. The sixth gear 306 and the seventh gear 307 are also selectively connected via a second synchronizer 42. The sixth gear 306, the seventh gear 307, and the eighth gear 308 are respectively engaged with the second gear 302, the third gear 303, and the fourth gear 304. Thus, when the first synchronizer 41 connects the fifth gear 305 or the sixth gear 306, or when the second synchronizer 42 connects the sixth gear 306 and the seventh gear 307, the outer input shaft 21 can be connected to the inner input shaft 22, expanding the transmission ratio configuration.

[0031] Furthermore, the second synchronizer 42 is fixedly connected to the sixth gear 306, requiring only a single-sided synchronizer, which reduces the cost of the synchronizer.

[0032] A tenth gear 310 is movably mounted on the output shaft 24. The tenth gear 310 meshes with the ninth gear 309, and the tenth gear 310 and the fourth gear 304 are selectively connected to the output shaft 24 via a third synchronizer 43.

[0033] Specifically, in reverse gear, the external input shaft 21 is connected to the power source via the dual clutch 10. The first synchronizer 41 connects the fifth gear 305 to the intermediate shaft 23. The second synchronizer 42 is idle. The third synchronizer connects the tenth gear 310 to the output shaft 24. A total of five gears, including the first gear 301, the reverse idler gear 311, the fifth gear 305, the ninth gear 309, and the tenth gear 310, participate in the transmission, including two movable gears. The internal input shaft 22 does not participate in the transmission.

[0034] In first gear, the external input shaft 21 is connected to the power source via the dual clutch 10, the first synchronizer 41 is idle, the second synchronizer 42 connects the sixth gear 306 and the seventh gear 307, and the third synchronizer connects the tenth gear 310 to the output shaft 24. A total of four pairs of gears participate in the transmission, including three movable gears. The internal input shaft 22 does not participate in the transmission.

[0035] In second gear, the inner input shaft 22 is connected to the power source via the dual clutch 10. The first synchronizer 41 is idle, the second synchronizer 42 is idle, and the third synchronizer connects the tenth gear 310 to the output shaft 24. The transmission is carried out by the fourth gear 304, the eighth gear 308, the ninth gear 309, the tenth gear 310, and the third synchronizer, for a total of two pairs of gears, including one movable gear. The outer input shaft 21 does not participate in the transmission.

[0036] In the third gear state, the external input shaft 21 is connected to the power source via the dual clutch 10. The first synchronizer 41 connects the sixth gear 306 to the intermediate shaft 23. The second synchronizer 42 is idle. The third synchronizer connects the tenth gear 310 to the output shaft 24. The transmission is carried out by the second gear 302, the sixth gear 306, the ninth gear 309, and the tenth gear 310, including two movable gears. The internal input shaft 22 does not participate in the transmission.

[0037] In fourth gear, the external input shaft 21 is connected to the power source via the dual clutch 10. The first synchronizer 41 is idle. The second synchronizer 42 connects the sixth gear 306 and the seventh gear 307. The third synchronizer connects the fourth gear 304 to the output shaft 24. The transmission is carried out by the second gear 302, the sixth gear 306, the seventh gear 307, and the third gear 303, including two movable gears. The intermediate shaft 23 does not participate in the transmission.

[0038] In fifth gear, the inner input shaft 22 is connected to the power source via the dual clutch 10. The first synchronizer 41 is idle, the second synchronizer 42 is idle, and the third synchronizer connects the fourth gear 304 to the output shaft 24. The inner input shaft 22 and the output shaft 24 are directly coaxially driven, resulting in the highest transmission efficiency.

[0039] In sixth gear, the external input shaft 21 is connected to the power source via the dual clutch 10. The first synchronizer 41 connects the sixth gear 306 to the intermediate shaft 23. The second synchronizer 42 is idle. The third synchronizer connects the fourth gear 304 to the output shaft 24. The transmission is carried out by the second gear 302, the sixth gear 306, the eighth gear 308, and the fourth gear 304, including a movable gear. All transmission shafts participate in the transmission.

[0040] The difference between the synchronizer settings for sixth gear and third gear lies only in the third synchronizer 43. Thus, by changing the setting state of the third synchronizer 43, the cross-gear operation between sixth gear and third gear can be achieved, which can be used for emergency deceleration and acceleration needs.

[0041] In particular, only one moving gear is involved in the transmission in the second and sixth gears, while no moving gear is involved in the fifth gear. This reduces the participation rate of the moving gear with low transmission efficiency, improves the overall transmission efficiency, especially in the high-speed fifth and sixth gears, where the number of moving gears involved is one and zero respectively, resulting in high transmission efficiency, reduced energy loss, improved energy efficiency ratio of the vehicle at high speeds, and enhanced environmental performance.

[0042] Shifting between third and fourth gear requires switching the states of two synchronizers. However, shifting between other adjacent gears only requires driving one synchronizer to switch states, resulting in minimal interference and high stability during gear changes. Designing the gear requiring the switching of two synchronizers to be between third and fourth gear allows the vehicle's higher speed at this point to reduce the impact of power interruption during gear changes, thus improving the driving experience.

[0043] The number of teeth of each gear is selected according to the above gear configuration relationship and specific speed requirements. This application does not impose any special restrictions on this, and all specific speed ratio configurations are within the protection scope of this application without departing from the gear configuration scheme of this application.

[0044] For example, in a specific instance, the gear ratios from first to sixth gear are 4.740, 3.192, 2.216, 1.485, 1, and 0.694, respectively, while the reverse gear ratio is -4.844, which can meet the gear shifting requirements of the compatible vehicle models.

[0045] The present invention also provides a transmission with the above-described transmission structure, wherein the dual clutch involved in this application is mainly used to provide dual clutch function, and the specific configuration of the dual clutch is not particularly limited.

[0046] The transmission structure and gearbox provided by this invention are equipped with an inner input shaft and an outer input shaft that are respectively connected to the two output shafts of a dual clutch and are nested and coaxially arranged. The output shaft is coaxially arranged with the inner input shaft, forming a longitudinal structure. The intermediate shaft is arranged parallel to and spaced apart from the inner input shaft. Two gears are fixedly arranged on each of the outer input shaft and the inner input shaft. One gear and a synchronizer are movably arranged on the output shaft. Five gears and one or two synchronizers are correspondingly arranged on the intermediate shaft. The transmission configuration between the inner input shaft, the outer input shaft, the intermediate shaft, and the output shaft can be adjusted through the three synchronizers. The transmission between the inner input shaft and the outer input shaft can be realized by using the intermediate shaft. The number of configurable gears can be increased. Thus, a longitudinal gearbox design with six forward gears and one reverse gear can be realized through five sets of gears. Moreover, there are only four movably connected gears, which account for a small proportion and can effectively improve the overall transmission efficiency.

[0047] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The above-described embodiments are merely illustrative of several specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A transmission structure, characterized by, The transmission comprises a double clutch, an inner input shaft, an outer input shaft, an output shaft and an intermediate shaft, wherein, the inner input shaft is coaxially nested with the outer input shaft and is respectively drivingly connected with two output shafts of the double clutch, the output shaft is coaxially arranged with the inner input shaft, and the intermediate shaft is arranged in parallel with the inner input shaft at intervals; the outer input shaft is fixedly provided with a first gear and a second gear, the inner input shaft is fixedly provided with a third gear and a fourth gear, and the fourth gear is arranged at the end of the inner input shaft close to the output shaft; the intermediate shaft is movably provided with a fifth gear, a sixth gear and a seventh gear, and is fixedly provided with an eighth gear and a ninth gear, the fifth gear and the first gear are drivingly connected through a reverse idler gear, the fifth gear and the sixth gear are selectively drivingly connected with the intermediate shaft through a first synchronizer, the sixth gear and the seventh gear are also selectively drivingly connected through a second synchronizer, and the sixth gear, the seventh gear and the eighth gear are respectively meshingly connected with the second gear, the third gear and the fourth gear; the output shaft is movably provided with a tenth gear and is fixedly provided with a third synchronizer, the tenth gear is meshingly connected with the ninth gear, and the tenth gear and the fourth gear are selectively drivingly connected with the output shaft through the third synchronizer; in the fourth gear state, the outer input shaft is drivingly connected with a power source through the double clutch, the first synchronizer is idle, the second synchronizer drivingly connects the sixth gear with the seventh gear, and the third synchronizer drivingly connects the fourth gear with the output shaft.

2. The transmission arrangement of claim 1, wherein in the reverse gear state, the outer input shaft is drivingly connected with the power source through the double clutch, the first synchronizer drivingly connects the fifth gear with the intermediate shaft, the second synchronizer is idle, and the third synchronizer drivingly connects the tenth gear with the output shaft.

3. The transmission arrangement of claim 1, wherein, in the first gear state, the outer input shaft is drivingly connected with the power source through the double clutch, the first synchronizer is idle, the second synchronizer drivingly connects the sixth gear with the seventh gear, and the third synchronizer drivingly connects the tenth gear with the output shaft.

4. The transmission arrangement of claim 3, wherein, in the second gear state, the inner input shaft is drivingly connected with the power source through the double clutch, the first synchronizer is idle, the second synchronizer is idle, and the third synchronizer drivingly connects the tenth gear with the output shaft.

5. The transmission arrangement of claim 4, wherein, in the third gear state, the outer input shaft is drivingly connected with the power source through the double clutch, the first synchronizer drivingly connects the sixth gear with the intermediate shaft, the second synchronizer is idle, and the third synchronizer drivingly connects the tenth gear with the output shaft.

6. The transmission arrangement of claim 5, wherein, in the fifth gear state, the inner input shaft is drivingly connected with the power source through the double clutch, the first synchronizer is idle, the second synchronizer is idle, and the third synchronizer drivingly connects the fourth gear with the output shaft.

7. The transmission arrangement of claim 6, wherein, In the sixth gear state, the outer input shaft is drivingly connected with the power source through the double clutch, the first synchronizer drivingly connects the sixth gear with the intermediate shaft, the second synchronizer is idle, and the third synchronizer drivingly connects the fourth gear with the output shaft.

8. A transmission characterized by, The transmission structure according to any one of claims 1 to 7.

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