A dual clutch transmission structure

Abstract

A dual-clutch transmission structure, a first countershaft is provided with a fourth gear, an eighth gear, a third gear and a seventh gear with clearance fit, a fourth-eight gear synchronizer is arranged between the fourth gear and the eighth gear and is circumferentially fixed on the first countershaft, a third-seven gear synchronizer is arranged between the third gear and the seventh gear and is circumferentially fixed on the first countershaft; a second countershaft is provided with a second gear, a sixth gear, a first gear and a fifth gear with clearance fit, a second gear and a sixth gear synchronizer is arranged between the second gear and the sixth gear and is circumferentially fixed on the second countershaft, a fifth gear synchronizer is arranged between the first gear and the fifth gear and is circumferentially fixed on the second countershaft; a solid shaft and a reverse gear shaft are arranged in parallel and staggered, a reverse gear is circumferentially fixed on one end of the reverse gear shaft, and the other end of the reverse gear shaft is clearance fit with a reverse gear output gear, the reverse gear output gear is meshed with the first driving gear, and a reverse gear synchronizer is arranged between the reverse gear and the reverse gear output gear and is circumferentially fixed on the reverse gear shaft.

Description

Technical Field

[0001] The invention relates to the field of dual-clutch transmissions, and in particular to a dual-clutch transmission structure. Background Art

[0002] At present, the patent "Dual Clutch Transmission" with the authorization publication number CN 105723116 B discloses a dual clutch transmission structure, such as Figure 1 As shown, the dual clutch transmission structure includes a first clutch K1a and a second clutch K2a for connecting power, wherein the second clutch K2a is fixedly connected to a hollow shaft 11a, and a first driving gear Z11a, a second driving gear Z21a, and a third driving gear Z31a are fixedly arranged circumferentially on the hollow shaft 11a;

[0003] The first clutch K1a is fixedly connected to a solid shaft 12a, the solid shaft 12a passes through the hollow shaft 11a and is located on the same axis as the hollow shaft 11a. The solid shaft 12a is circumferentially fixed with a fourth driving gear Z41a and a fifth driving gear Z51a.

[0004] The solid shaft 12a is staggeredly arranged in parallel with a first secondary shaft 13a, and a first output gear Z01a is fixedly arranged in the circumferential direction at one end of the first secondary shaft 13a;

[0005] The ninth shifting unit S9a is arranged coaxially with the first countershaft 13a. The ninth shifting unit S9a is arranged between the second gear plane Z2a and the fourth gear plane Z4a. The ninth shifting unit S9a is used to connect the floating gear Z22a of the second gear plane Z2a to the first floating gear Z42a of the fourth gear plane Z4a in a rotationally fixed manner. The first coupling element of the ninth shifting unit S9a is permanently connected to the floating gear Z22a of the second gear plane Z2a in a rotationally fixed manner. The second coupling element of the ninth shifting unit S9a is permanently connected to the first floating gear Z42a of the fourth gear plane Z4a in a rotationally fixed manner. The ninth shifting unit S9a is engaged only in the first forward transmission gear V1a, the ninth forward transmission gear V9a and the reverse transmission gear R2a. The ninth shifting unit S9a is engaged only in these labyrinth gears.

[0006] The above technical solution has a total of 8 floating gears, which are arranged as an 8-forward gear transmission. It needs 1 forward gear combination to be realized, and the combined gear position requires multi-stage gear meshing transmission, which is inefficient. In order to ensure the comprehensive transmission efficiency of the transmission, the combination of 1 gear is the best choice. However, after the combination of 1 gear, Z43a as a reverse gear can only cooperate with the 3rd gear to form a reverse gear ratio, which makes it difficult to design the total reverse gear ratio.

[0007] Moreover, there are 2 pairs of 2-speed conjugated gears in the forward gear (Z51a, Z52a, Z53a; Z11a, Z12a, Z13a), and 1 combined gear (1st gear). The gear ratio of the high gear is restricted by the conjugation, and the gear ratio of the low gear is restricted by the combined gear. It is difficult to design an ideal gear ratio, the total speed ratio of the reverse gear is small, the clutch is difficult to match, and the risk of friction ablation is high. Summary of the invention

[0008] The purpose of the present invention is to provide a dual-clutch transmission structure to address the corresponding deficiencies of the prior art, which can combine 8 sets of reverse gear ratios. Not only is the reverse gear ratio selection flexible, but the axial structure is compact, and the reverse gear synchronizer is arranged at the reverse gear 1st stage deceleration, and the synchronizer capacity requirement is low.

[0009] The object of the present invention is achieved by adopting the following scheme: a dual clutch transmission structure, comprising a first clutch and a second clutch, wherein the second clutch is fixedly connected to a hollow shaft, and a first driving gear, a second driving gear, and a third driving gear are fixedly arranged circumferentially on the hollow shaft;

[0010] The first clutch is fixedly connected to a solid shaft, the solid shaft passes through the hollow shaft and is located on the same axis as the hollow shaft, and the solid shaft is circumferentially fixed with a fourth driving gear, a fifth driving gear, and a sixth driving gear;

[0011] The solid shaft is staggeredly arranged in parallel with a first secondary shaft, and a first output gear is circumferentially fixedly disposed at one end of the first secondary shaft;

[0012] The first secondary shaft is also provided with a fourth gear, an eighth gear, a third gear and a seventh gear in clearance fit, a fourth-eighth gear synchronizer is provided between the fourth gear and the eighth gear and is circumferentially fixed on the first secondary shaft, and a third-seventh gear synchronizer is provided between the third gear and the seventh gear and is circumferentially fixed on the first secondary shaft;

[0013] The first driving gear is meshed with the fourth gear gear, the third driving gear is meshed with the eighth gear gear, the sixth driving gear is meshed with the third gear gear, and the fourth driving gear is meshed with the seventh gear gear;

[0014] The solid shaft is also staggered and arranged in parallel with a second secondary shaft, and a second output gear is fixedly arranged in the circumferential direction at one end of the second secondary shaft;

[0015] The second secondary shaft is also provided with a second gear, a sixth gear, a first gear and a fifth gear in clearance fit, a second sixth gear synchronizer is provided between the second gear and the sixth gear and is circumferentially fixed on the second secondary shaft, and a fifth gear synchronizer is provided between the first gear and the fifth gear and is circumferentially fixed on the second secondary shaft;

[0016] The second driving gear is meshed with the second gear, the third driving gear is meshed with the sixth gear, the fifth driving gear is meshed with the first gear, and the fourth driving gear is meshed with the fifth gear;

[0017] The solid shaft is also staggered and arranged in parallel with a reverse gear shaft. A reverse gear is fixedly arranged at one end of the reverse gear shaft in the circumferential direction. The other end of the reverse gear shaft is clearance-matched with a reverse gear output gear. The reverse gear output gear is meshed with the first driving gear. A reverse gear synchronizer is arranged between the reverse gear and the reverse gear output gear and is circumferentially fixed on the reverse gear shaft.

[0018] The present invention has the following beneficial effects: the second clutch is fixedly connected to a hollow shaft, and the first driving gear, the second driving gear, and the third driving gear are fixedly arranged circumferentially on the hollow shaft;

[0019] The first clutch is fixedly connected to a solid shaft, the solid shaft passes through the hollow shaft and is located on the same axis as the hollow shaft, and the solid shaft is circumferentially fixed with a fourth driving gear, a fifth driving gear, and a sixth driving gear;

[0020] The solid shaft is staggeredly arranged in parallel with a first secondary shaft, and a first output gear is circumferentially fixedly disposed at one end of the first secondary shaft;

[0021] The first secondary shaft is also provided with a fourth gear, an eighth gear, a third gear and a seventh gear in clearance fit, a fourth-eighth gear synchronizer is provided between the fourth gear and the eighth gear and is circumferentially fixed on the first secondary shaft, and a third-seventh gear synchronizer is provided between the third gear and the seventh gear and is circumferentially fixed on the first secondary shaft;

[0022] The first driving gear is meshed with the fourth gear gear, the third driving gear is meshed with the eighth gear gear, the sixth driving gear is meshed with the third gear gear, and the fourth driving gear is meshed with the seventh gear gear;

[0023] The solid shaft is also staggered and arranged in parallel with a second secondary shaft, and a second output gear is fixedly arranged in the circumferential direction at one end of the second secondary shaft;

[0024] The second secondary shaft is also provided with a second gear, a sixth gear, a first gear and a fifth gear in clearance fit, a second sixth gear synchronizer is provided between the second gear and the sixth gear and is circumferentially fixed on the second secondary shaft, and a fifth gear synchronizer is provided between the first gear and the fifth gear and is circumferentially fixed on the second secondary shaft;

[0025] The second driving gear is meshed with the second gear, the third driving gear is meshed with the sixth gear, the fifth driving gear is meshed with the first gear, and the fourth driving gear is meshed with the fifth gear;

[0026] The solid shaft is also staggered and arranged in parallel with a reverse gear shaft. A reverse gear is fixedly arranged at one end of the reverse gear shaft in the circumferential direction. The other end of the reverse gear shaft is clearance-matched with a reverse gear output gear. The reverse gear output gear is meshed with the first driving gear. A reverse gear synchronizer is arranged between the reverse gear and the reverse gear output gear and is circumferentially fixed on the reverse gear shaft.

[0027] In summary, the present invention can combine 8 sets of reverse gear ratios. Not only is the reverse gear ratio selection flexible, but the axial structure is compact. The reverse gear synchronizer is arranged at the reverse gear 1st stage reduction, and the synchronizer capacity requirement is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a dual clutch transmission structure of the prior art;

[0029] Figure 2 It is a structural schematic diagram of the present invention;

[0030] Figure 3 It is a schematic diagram of a specific implementation of the present invention. DETAILED DESCRIPTION

[0031] like Figures 2 to 3 As shown, a dual clutch transmission structure includes a first clutch K1 and a second clutch K2, wherein the second clutch K2 is fixedly connected to a hollow shaft 11, and a first driving gear Z11, a second driving gear Z21, and a third driving gear Z31 are fixedly arranged circumferentially on the hollow shaft 11;

[0032] The first clutch K1 is fixedly connected to a solid shaft 12, the solid shaft 12 passes through the hollow shaft 11 and is located on the same axis as the hollow shaft 11. The solid shaft 12 is circumferentially fixed with a fourth driving gear Z41, a fifth driving gear Z51, and a sixth driving gear Z61;

[0033] The solid shaft 12 is staggeredly arranged in parallel with a first secondary shaft 13, and a first output gear Z01 is fixedly arranged in the circumferential direction at one end of the first secondary shaft 13;

[0034] The first countershaft 13 is also provided with a fourth gear Z12, an eighth gear Z32, a third gear Z62, and a seventh gear Z42 with clearance fit, a fourth-eighth gear synchronizer T48 is provided between the fourth gear Z12 and the eighth gear Z32 and is circumferentially fixed on the first countershaft 13, and a third-seventh gear synchronizer T37 is provided between the third gear Z62 and the seventh gear Z42 and is circumferentially fixed on the first countershaft 13;

[0035] The first driving gear Z11 is meshed with the fourth gear gear Z12, the third driving gear Z31 is meshed with the eighth gear gear Z32, the sixth driving gear Z61 is meshed with the third gear gear Z62, and the fourth driving gear Z41 is meshed with the seventh gear gear Z42;

[0036] The solid shaft 12 is also arranged in parallel and staggered with a second secondary shaft 14, and a second output gear Z02 is fixedly arranged at one end of the second secondary shaft 14 in the circumferential direction;

[0037] The second countershaft 14 is also provided with a second gear Z23, a sixth gear Z33, a first gear Z53, and a fifth gear Z43 with clearance fit, a second-sixth gear synchronizer T26 is provided between the second gear Z23 and the sixth gear Z33 and is circumferentially fixed on the second countershaft 14, and a fifth gear synchronizer T15 is provided between the first gear Z53 and the fifth gear Z43 and is circumferentially fixed on the second countershaft 14;

[0038] The second driving gear Z21 is meshed with the second gear Z23, the third driving gear Z31 is meshed with the sixth gear Z33, the fifth driving gear Z51 is meshed with the first gear Z53, and the fourth driving gear Z41 is meshed with the fifth gear Z43;

[0039] The solid shaft 12 is also staggered and arranged in parallel with a reverse gear shaft 15. A reverse gear Z54 is circumferentially fixed on one end of the reverse gear shaft 15. The other end of the reverse gear shaft 15 is clearance-matched with a reverse gear output gear Z14. The reverse gear output gear Z14 is meshed with the first driving gear Z11. A reverse gear synchronizer TR is circumferentially fixed on the reverse gear shaft 15 and arranged between the reverse gear Z54 and the reverse gear output gear Z14.

[0040] In this embodiment, when the first clutch K1 is disconnected and the second clutch K2 is engaged, the first driving gear Z11 starts to transmit power to the fourth gear Z12 and the reverse output gear Z14 of the first gear plane Z1; the second driving gear Z21 starts to transmit power to the second gear Z23 of the second gear plane Z2; the third driving gear Z31 starts to transmit power to the eighth gear Z32 and the sixth gear Z33 of the third gear plane Z3;

[0041] At this time, if the 4th and 8th gear synchronizer T48 is in the switching unit S1, the power transmitted to the 4th gear Z12 is transmitted to the first output gear Z01 of the output gear plane Z0 through the 4th and 8th gear synchronizer T48, and the transmission output outputs forward power according to the 4th gear;

[0042] If the 4th and 8th gear synchronizer T48 is in the switching unit S2, the power transmitted to the 8th gear Z32 is transmitted to the first output gear Z01 of the output gear plane Z0 through the 4th and 8th gear synchronizer T48, and the transmission outputs forward power according to the 8th gear;

[0043] If the second and sixth gear synchronizer T26 is in the switching unit S7, the power transmitted to the sixth gear Z33 is transmitted to the second output gear Z02 of the output gear plane Z0 through the second and sixth gear synchronizer T26, and the transmission output outputs forward power according to the sixth gear;

[0044] If the second and sixth gear synchronizer T26 is in the switching unit S8, the power transmitted to the second gear Z23 is transmitted to the second output gear Z02 of the output gear plane Z0 through the second and sixth gear synchronizer T26, and the transmission output outputs forward power according to the second gear;

[0045] If the reverse gear synchronizer TR is in the switching unit S9, the power transmitted to the reverse gear output gear Z14 is transmitted to the reverse gear Z54 set on the reverse gear shaft 15 through the reverse gear synchronizer TR. The transmission outputs reverse power according to the state of the switching unit where the 4th and 8th gear synchronizer T48 or the 2nd and 6th gear synchronizer T26 is located.

[0046] When the first clutch K1 is engaged and the second clutch K2 is disengaged, the fourth driving gear Z41 starts to transmit power to the seventh gear Z42 and the fifth gear Z43 of the fourth gear plane Z4; the fifth driving gear Z51 starts to transmit power to the first gear Z53 and the reverse gear Z54 of the fifth gear plane Z5; the sixth driving gear Z61 starts to transmit power to the third gear Z62 of the sixth gear plane Z6;

[0047] At this time, if the 3rd-7th gear synchronizer T37 is in the switching unit S3, the power transmitted to the 7th gear Z42 is transmitted to the first output gear Z01 of the output gear plane Z0 through the 3rd-7th gear synchronizer T37, and the transmission output outputs forward power according to the 7th gear;

[0048] If the 3rd-7th gear synchronizer T37 is in the switching unit S4, the power transmitted to the 3rd gear Z62 is transmitted to the first output gear Z01 of the output gear plane Z0 through the 3rd-7th gear synchronizer T37, and the transmission output outputs forward power according to the 3rd gear;

[0049] If the one-fifth gear synchronizer T15 is in the switching unit S5, the power transmitted to the first gear gear Z53 is transmitted to the second output gear Z02 of the output gear plane Z0 through the one-fifth gear synchronizer T15, and the transmission output outputs forward power according to the one-gear gear position;

[0050] If the first five-speed synchronizer T15 is in the switching unit S6, the power transmitted to the fifth-speed gear Z43 is transmitted to the second output gear Z02 of the output gear plane Z0 through the first five-speed synchronizer T15, and the transmission outputs forward power according to the fifth gear;

[0051] If the reverse gear synchronizer TR is in the switching unit S9, the power transmitted to the reverse gear Z54 is transmitted to the reverse gear output gear Z14 through the reverse gear synchronizer TR, and the transmission outputs reverse power according to the state of the switching unit where the 15th gear synchronizer T15 or the 37th gear synchronizer T37 is located.

[0052] It can be seen that the present invention can combine 8 sets of reverse gear ratios, which not only has flexible reverse gear ratio selection but also has a compact axial structure. The reverse gear synchronizer TR is arranged at the reverse gear 1st stage reduction, and the synchronizer capacity requirement is low. Of course, if necessary, the first driving gear Z11 and the second driving gear Z21 can be integrated into a design and replaced by one gear to reduce the overall axial size.

[0053] The "gear plane" is particularly understood to be a transmission plane having at least one gear pair, which includes at least two gears that mesh with each other and are used to transmit power flow in at least one transmission gear. Preferably, all gears in the gear plane are interactively connected in pairs.

[0054] The term “output gear plane” refers in particular to an additional gear plane which serves to output the power flow from the dual clutch transmission in all transmission gears.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A dual clutch transmission structure, comprising a first clutch (K1) and a second clutch (K2), characterized in that: The second clutch (K2) is fixedly connected to a hollow shaft (11), and a first driving gear (Z11), a second driving gear (Z21), and a third driving gear (Z31) are fixedly provided circumferentially on the hollow shaft (11); The first clutch (K1) is fixedly connected to a solid shaft (12), the solid shaft (12) passes through the hollow shaft (11) and is located on the same axis as the hollow shaft (11), and the solid shaft (12) is circumferentially fixed with a fourth driving gear (Z41), a fifth driving gear (Z51), and a sixth driving gear (Z61); The solid shaft (12) and a first secondary shaft (13) are arranged in parallel and staggered, and a first output gear (Z01) is fixedly provided in the circumferential direction at one end of the first secondary shaft (13); The first secondary shaft (13) is also provided with a fourth gear (Z12), an eighth gear (Z32), a third gear (Z62), and a seventh gear (Z42) in a clearance fit; a fourth-eighth gear synchronizer (T48) is provided between the fourth gear (Z12) and the eighth gear (Z32) and is circumferentially fixed on the first secondary shaft (13); and a third-seventh gear synchronizer (T37) is provided between the third gear (Z62) and the seventh gear (Z42) and is circumferentially fixed on the first secondary shaft (13); The first driving gear (Z11) meshes with the fourth gear gear (Z12), the third driving gear (Z31) meshes with the eighth gear gear (Z32), the sixth driving gear (Z61) meshes with the third gear gear (Z62), and the fourth driving gear (Z41) meshes with the seventh gear gear (Z42); The solid shaft (12) is also arranged in parallel and staggered with a second secondary shaft (14); a second output gear (Z02) is circumferentially fixedly disposed at one end of the second secondary shaft (14); The second secondary shaft (14) is also provided with a second gear (Z23), a sixth gear (Z33), a first gear (Z53), and a fifth gear (Z43) in a clearance fit; a second-sixth gear synchronizer (T26) is provided between the second gear (Z23) and the sixth gear (Z33) and is circumferentially fixed on the second secondary shaft (14); and a fifth gear synchronizer (T15) is provided between the first gear (Z53) and the fifth gear (Z43) and is circumferentially fixed on the second secondary shaft (14); The second driving gear (Z21) meshes with the second gear (Z23), the third driving gear (Z31) meshes with the sixth gear (Z33), the fifth driving gear (Z51) meshes with the first gear (Z53), and the fourth driving gear (Z41) meshes with the fifth gear (Z43); The solid shaft (12) is also arranged in parallel with a reverse gear shaft (15) in a staggered manner. A reverse gear (Z54) is circumferentially fixedly arranged at one end of the reverse gear shaft (15). The other end of the reverse gear shaft (15) is clearance-matched with a reverse gear output gear (Z14). The reverse gear output gear (Z14) is meshed with a first driving gear (Z11). A reverse gear synchronizer (TR) is circumferentially fixed on the reverse gear shaft (15) and arranged between the reverse gear (Z54) and the reverse gear output gear (Z14).

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