Transmission system for a vehicle

Abstract

A transmission system for a vehicle, in particular a front wheel drive vehicle, having an input arranged for connection to a drive source, and an output arranged for connection to a load. The transmission system comprises a transmission which in turn comprises an output shaft connected to the output, a first input shaft and a first speed change transmission coupling the first input shaft to the output shaft, and a second input shaft and a second speed change transmission coupling the second input shaft to the output shaft.

Description

Technical Field

[0001] The present invention relates to a transmission system for a vehicle, the system having an input section arranged for connection to a drive source and an output section arranged for connection to a load. Background Technology

[0002] Transmission systems, such as automatic transmission systems for vehicles, are known. Such transmission systems typically have an input section arranged for connection to a drive source, such as an internal combustion engine, and an output section arranged for connection to a load, such as the vehicle's drivetrain. One type of transmission system includes a gearbox comprising a first input shaft, a first output shaft connected to the output section, and a first speed-changing transmission between the first input shaft and the first output shaft; and further comprising a second input shaft, a second output shaft connected to the output section, and a second speed-changing transmission between the second input shaft and the second output shaft. Therefore, different gears, such as first gear, second gear, third gear, etc., can be associated with the first input shaft or the second input shaft and can be selected individually.

[0003] WO2018 / 192965A1 describes a transmission system including a first coupling member having a first portion connected to an input section and a second portion connected to a first input shaft of the transmission; a second coupling member having a third portion connected to an input section and a fourth portion connected to a second input shaft of the transmission; and another coupling member having a fifth portion connected to the first input shaft and a sixth portion connected to the second input shaft for directly coupling the first and second input shafts to each other. Summary of the Invention

[0004] The object of this invention is to provide a transmission system that is more cost-effective than known transmission systems. Alternatively, or additionally, the object of this invention is to provide a transmission system that allows for smooth transitions via successive drivetrains. Alternatively, or additionally, the object of this invention is to provide a transmission system that offers flexibility in selecting the transmission drivetrain. More generally, the object of this invention is to provide an improved, or at least alternative, transmission system.

[0005] According to one aspect, a transmission system for a vehicle, particularly a front-wheel-drive vehicle, is provided. The transmission system has an input section arranged for connection to a drive source, such as an internal combustion engine and / or an electric motor, and an output section arranged for connection to a load, such as the vehicle's drive system. The transmission system includes a transmission, which further includes an output shaft connected to the output section, a first input shaft and a first speed-changing transmission connecting the first input shaft to the output shaft, and a second input shaft and a second speed-changing transmission connecting the second input shaft to the output shaft.

[0006] In this document, the term speed conversion transmission (speed conversion gear unit) is used to refer to a combination of multiple (e.g., pairs) gears that convert the rotational speed of a corresponding input shaft into a (lower, equal, or higher) rotational speed on an output shaft. A transmission system allows a vehicle to operate in different gears, such as reverse gear, first gear, second gear, third gear, fourth gear, fifth gear, etc. Each speed conversion transmission is associated with one or more transmission gear units. In this document, a transmission gear unit (transmission gear unit) refers to a combination of multiple (e.g., pairs) gears that cause the transmission to operate in a predetermined gear. For example, a first transmission gear unit causes the transmission to operate in first gear, a second transmission gear unit causes the transmission to operate in second gear, and so on. It is understood that different transmission gear units may share one or more gears. For example, a first / second transmission gear unit refers to a combination of multiple (e.g., pairs) gears that cause the transmission to operate in first or second gear, depending on the arrangement of the transmission system's connecting components.

[0007] Accordingly, the transmission system further includes a first coupling member and a second coupling member. The first coupling member includes a first friction element, has a first portion connected to an input section and a second portion connected to a first input shaft of the transmission. The second coupling member includes a second friction element, has a third portion connected to an input section, and a fourth portion connected to a second input shaft of the transmission. The transmission system includes a third coupling member containing a third friction element, having a fifth portion connected to the first input shaft and a sixth portion connected to the transmission drive of the transmission. A fourth coupling member includes a fourth friction element, having a seventh portion connected to the second input shaft and an eighth portion connected to the transmission drive of the transmission. Thus, the number of idle gears in the transmission system is minimized when operating each transmission drive, reducing inertia and frictional losses. Furthermore, this allows input gears of other transmission drives to be connected to the first or second input shaft without additional coupling members and / or bearings, since the first and second input shafts can be connected to each other via the transmission drive using the third and fourth coupling members.

[0008] Optionally, the transmission includes only one output shaft. This achieves a particularly compact construction with low complexity.

[0009] Optionally, the first and second speed change transmissions together include a group of transmission transmissions, each of which, except for the reverse transmission transmission, includes an input gear and an output gear, wherein the input gear of each transmission transmission is connected to or can be connected to the first input shaft or the second input shaft, and wherein the output gear of each transmission transmission is connected to or can be connected to the only output shaft.

[0010] Optionally, the sixth portion of the third connecting member and the eighth portion of the fourth connecting member are connected to the third / fourth or third / fourth / fifth transmission. In this way, the first and second input shafts can be connected to each other via the third / fourth or third / fourth / fifth transmission. This allows the input gears of other transmissions to be connected to the first or second input shaft without the need for additional connecting members and / or bearings. For example, the input gear of the first / second transmission can be connected to the second input shaft. The first / second transmission can be connected to the first input shaft via the third / fourth transmission using the third and fourth connecting members. Similarly, the input gear of the fifth / sixth or fifth / sixth / seventh transmission can be connected to the second input shaft and can be connected to the first input shaft via the third / fourth transmission using the third and fourth connecting members.

[0011] Optionally, the sixth part of the third connecting member and the eighth part of the fourth connecting member are directly connected to the gears of the first or second speed conversion transmission device.

[0012] Optionally, the sixth part of the third connecting member and the eighth part of the fourth connecting member are directly connected to the gears of the third / fourth transmission.

[0013] Optionally, the sixth part of the third connecting member and the eighth part of the fourth connecting member are directly connected to the input gear of the third / fourth transmission.

[0014] Optionally, the first and / or second speed conversion transmission device is axially positioned between the first friction element and the second friction element.

[0015] Optionally, the first friction element is arranged at a first end of the transmission, and / or the second friction element is arranged at the opposite second end of the transmission, for example, on the side of the drive source.

[0016] Optionally, the first and / or second connecting member includes, for example, a planetary gear set comprising at least three rotating members and a friction brake. The at least three rotating members may include a sun gear, a planet carrier, and a ring gear.

[0017] Optionally, the first and / or second connecting member includes, for example, a planetary gear set comprising at least four rotating members and two friction brakes. A first portion of the first connecting member may be associated with a first rotating member of the planetary gear set. A second portion of the first connecting member may be associated with a second rotating member of the planetary gear set. A third rotating member of the planetary gear set may be associated with a first friction element, such as a first friction brake. A fourth rotating member of the planetary gear set may be associated with another friction element, such as another friction brake.

[0018] Optionally, the rotating component of the planetary gear set is directly connected to the gear of the first or second speed conversion transmission.

[0019] Optionally, the first and / or second and / or third and / or fourth coupling member includes a friction clutch, such as a wet or dry plate friction clutch.

[0020] Optionally, the third coupling member includes a third synchronizer, such as a coupling in the form of a closed mechanism, such as a dog clutch and / or a key coupling.

[0021] Optionally, the fourth coupling member includes a fourth synchronizer, such as a coupling in the form of a closed mechanism, such as a dog clutch and / or a key coupling.

[0022] Optionally, the first speed change transmission includes a second, fourth, and sixth speed change transmission.

[0023] Optionally, the first speed change transmission includes an eighth speed change transmission.

[0024] Optionally, the second speed change transmission includes the first, third, and fifth speed change transmissions.

[0025] Optionally, the second speed change transmission includes a seventh speed change transmission.

[0026] Optionally, the first speed change transmission includes a reverse transmission.

[0027] Optionally, the transmission does not have a reverse transmission drive.

[0028] According to an aspect of the invention, a transmission system for a front-wheel-drive vehicle is provided, the transmission system having an input arranged for connection to a drive source and an output arranged for connection to a load. The transmission system includes a transmission, which includes an output shaft connected to the output, a first input shaft and a first speed change transmission connecting the first input shaft to the output shaft, and a second input shaft and a second speed change transmission connecting the second input shaft to the output shaft. The first and second speed change transmissions collectively include a group of transmission transmissions, each transmission transmission including an input gear and an output gear, wherein the input gear is connected to or can be connected to the first or second input shaft, and the output gear is connected to or can be connected to the output shaft. The first and second speed change transmissions also include a linkage, including a first linkage gear connected to or can be connected to the first or second input shaft, and a second linkage gear connected to or can be connected to the output shaft. The first linkage gear meshes with the second linkage gear, wherein the second linkage gear is rotatably connected to the output gear of one of the transmission transmissions.

[0029] Optionally, the second linking gear and the output gear of one of the transmission gears are both mounted on a common linking shaft.

[0030] Alternatively, the axis of rotation of the link shaft may coincide with the axis of rotation of the output shaft. This allows for a compact structure and limits the number of parts.

[0031] Optionally, the second link gear is rotatably connected to the output gear of the third / fourth transmission.

[0032] Optionally, the transmission includes only one output shaft.

[0033] According to an aspect of the invention, a transmission system for a front-wheel-drive vehicle is provided, the transmission system having an input arranged for connection to a drive source and an output arranged for connection to a load. The transmission system includes a transmission, which includes an output shaft connected to the output, a first input shaft and a first speed change transmission connecting the first input shaft to the output shaft, and a second input shaft and a second speed change transmission connecting the second input shaft to the output shaft. The first and second speed change transmissions include a group of transmission transmissions, which in turn include a third / fourth transmission transmission.

[0034] Optionally, the group transmission drive unit further includes a first / second transmission drive unit.

[0035] Optionally, the group transmission further includes a fifth / sixth or fifth / sixth / seventh transmission.

[0036] Optionally, the transmission includes only one output shaft.

[0037] Optionally, each transmission gear includes an input gear and an output gear, wherein the input gear of each transmission gear is connected to or can be connected to a first or second input shaft, and wherein the output gear of each transmission gear is connected to or can be connected to only one output shaft.

[0038] According to an aspect of the invention, a transmission system for a front-wheel-drive vehicle is provided, the transmission system having an input arranged for connection to a drive source and an output arranged for connection to a load. The transmission system includes a transmission, which includes an output shaft connected to the output, a first input shaft and a first speed change transmission connecting the first input shaft to the output shaft, and a second input shaft and a second speed change transmission connecting the second input shaft to the output shaft. The first and second speed change transmissions include a group of transmission transmissions, which includes a third / fourth / fifth transmission transmission.

[0039] Optionally, the group transmission drive unit further includes a first / second transmission drive unit.

[0040] Optionally, the group transmission further includes a sixth / seventh / eighth transmission.

[0041] Optionally, the transmission includes only one output shaft.

[0042] Optionally, each transmission gear includes an input gear and an output gear, wherein the input gear of each transmission gear is connected to or can be connected to a first or second input shaft, and wherein the output gear of each transmission gear is connected to or can be connected to only one output shaft.

[0043] According to one aspect, a vehicle is provided that includes a transmission system according to any of the foregoing embodiments of the present invention.

[0044] It is understood that any one or more of the aforementioned aspects, features, and options can be combined. It is understood that any matter described in one of these aspects can equally apply to any aspect of the others. It is also clear that all aspects, features, and options described in relation to the transmission system are equally applicable to the vehicle. Attached Figure Description

[0045] The present invention will be further described based on exemplary embodiments shown in the accompanying drawings. Exemplary embodiments are given by way of non-limiting description. It should be noted that the drawings are merely illustrative representations of embodiments of the present invention given by way of non-limiting example.

[0046] In the attached diagram:

[0047] Figure 1A A schematic diagram of a transmission system for a vehicle is shown;

[0048] Figure 1B It shows Figure 1A Functional diagram of the transmission system;

[0049] Figure 2 A schematic diagram of the transmission system is shown;

[0050] Figure 3 A schematic diagram of a transmission system 1 for a vehicle is shown;

[0051] Figure 4A A schematic diagram of the transmission system is shown;

[0052] Figure 4B It shows Figure 4A Functional diagram of the transmission system;

[0053] Figure 5A A schematic diagram of the transmission system is shown;

[0054] Figure 5B It shows Figure 5A Functional diagram of the transmission system;

[0055] Figure 6 A schematic diagram of a transmission system for a vehicle is shown;

[0056] Figure 7 A schematic diagram of the transmission system is shown;

[0057] Figure 8A A schematic diagram of the transmission system is shown;

[0058] Figure 8B It shows Figure 8A Functional diagram of the transmission system;

[0059] Figure 9A A schematic diagram of the transmission system is shown;

[0060] Figure 9B It shows Figure 9A Functional diagram of the transmission system;

[0061] Figure 10A A schematic diagram of the transmission system is shown;

[0062] Figure 10B It shows Figure 10A Functional diagram of the transmission system;

[0063] Figure 11AA schematic diagram of the transmission system is shown; and

[0064] Figure 11B It shows Figure 11A Functional diagram of the transmission system. Detailed Implementation

[0065] Figure 1A A schematic diagram of a transmission system 1 for a vehicle is shown. Figure 1B It shows Figure 1A The diagram illustrates the function of a transmission system 1. The transmission system 1 includes an input section 2. The input section 2 is connected to a drive source, which in this case is an internal combustion engine (ICE) and / or an electric motor (EM). The transmission system 1 also includes an output section 4. The output section 4 is connected to a load L, which is, for example, the wheels of a vehicle and / or the drivetrain. The load L may be connected to the output section 4, for example, via a differential transmission (differential gear).

[0066] In this example, the transmission system 1 includes an initial coupling member C0. The initial coupling member C0 includes a friction element, in this case, a friction clutch. The initial coupling member C0 is included in the input section 2 of the transmission system. The initial coupling member C0 connects the input section 2 to a second coupling member C2. The initial coupling member C0 allows the transmission to selectively engage with a drive source, such as an internal combustion engine (ICE). In this example, an electric motor (EM) or generator cannot be disengaged via the initial coupling member C0. For cost-effectiveness and compact construction considerations, the initial coupling member C0 may be omitted. In other transmission systems shown in the figures, the initial coupling member C0 may be omitted.

[0067] The transmission system 1 includes a transmission 8, which is a 6-speed transmission. The transmission 8 has a first input shaft 12 and a second input shaft 14. The transmission has a single output shaft 16 connected to the output section 4. This allows for a compact construction of the transmission system 1 and reduces its complexity.

[0068] The transmission system 1 further includes a first connecting member C1 and a second connecting member C2. In this example, the first connecting member C1 includes a planetary gear set 22 having three rotating members 24, 26, and 28. The first rotating member 24 is connected to the input section 2 and is formed here by a ring gear. The second rotating member 26 is connected to the first input shaft 12 and is formed here by a planet carrier. The third rotating member 28 is connected to the first friction element 30 and is formed here by a sun gear. The first friction element 30 is here a friction brake, such as a wet or dry plate friction brake, which is, for example, normally open.

[0069] When the third rotating member 28 is braked, the gear ratio between the first and second rotating members 24 and 26 is found to be between values ​​one and two, decreasing towards the output. In this example, the gear ratio of the planetary gear set 22 and the transmission 8 is selected such that the lowest forward gear of the transmission system 1 can be reached by closing the brake.

[0070] In this example, the second connecting member C2 includes a second friction element 32. The second connecting member 20 is formed by a friction clutch. This clutch includes a first portion 34 connected to the input portion 2 and a second portion 36 connected to the second input shaft 14. The clutch is a wet or dry plate friction clutch that is conventionally closed by spring force. The second connecting member C2 can be arranged for actuation via an axial thrust bearing.

[0071] Therefore, the first connecting member C1 selectively connects the input section 2 to the first input shaft 12. If the first connecting member C1 connects the input section 2 to the first input shaft 12, the first connecting member C1 connects the input section 2 to the first input shaft 12 while changing the rotational speed (here, reducing the rotational speed). Here, the rotational speed of the first input shaft 12 is reduced relative to the rotational speed of the input section 2 by a factor between one and two. This factor can be, for example, between 1.2 and 1.7, preferably between 1.3 and 1.5. The second connecting member C2 here is a direct connection; if connected, while maintaining the rotational speed, the second connecting member C2 can selectively connect the input section 2 to the second input shaft 14. More generally, the first connecting member C1 connects the input section 2 to the first input shaft 12 at a first speed ratio, while the second connecting member C2 connects the input section 2 to the second input shaft 14 at a second speed ratio, wherein the first and second speed ratios are different.

[0072] The first speed conversion transmission device 38 connects the first input shaft 12 and the output shaft 16. The second speed conversion transmission device 40 connects the second input shaft 14 and the output shaft 16.

[0073] In transmission system 1, the first and second speed change transmissions together comprise a group of transmission transmissions. Each transmission transmission, except for the reverse transmission transmission, includes an input gear and an output gear, wherein the input gear of each transmission transmission is connected or can be connected to the first input shaft 12 or the second input shaft 14, and the output gear of each transmission transmission is connected or can be connected to the output shaft 16.

[0074] The transmission system 1 further includes a third coupling member S0, which includes a third friction element, here a friction clutch. Here, the third coupling member S0 includes a third synchronizer. This synchronizer may include a closed coupling, such as a toothed clutch and / or a keyed coupling. This may also apply to other synchronizers discussed below. The third coupling member S0 has a fifth portion S0a connected to the first input shaft 12, and a sixth portion S0b connected to the transmission drive of the transmission. In this example, the sixth portion S0b is connected to the third / fourth transmission drive 103. In particular, the sixth portion S0b is connected to the input gear 103a of the third / fourth transmission drive.

[0075] The transmission system 1 further includes a fourth coupling member S6, which includes a fourth friction element, here a friction clutch. Here, the fourth coupling member S6 includes a fourth synchronizer. The fourth coupling member S6 has a seventh portion S6a connected to the first and second shafts 14, and an eighth portion S6b connected to the transmission drive of the transmission. In this example, the sixth portion S6b is connected to the third / fourth transmission drive 103. In particular, the eighth portion S6b is connected to the input gear 103a of the third / fourth transmission drive.

[0076] Here, the third connecting member S0 selectively connects the first input shaft 12 to the output shaft 16 via the third / fourth transmission 103 to allow the transmission to operate in the third gear. The fourth connecting member S6 selectively connects the second input shaft 14 to the output shaft 16 via the third / fourth transmission 103 to allow the transmission to operate in the fourth gear.

[0077] Furthermore, when the third connecting member S0 connects the first input shaft 12 to the third / fourth transmission drive 103, and the fourth connecting member S6 connects the second input shaft 14 to the third / fourth transmission drive 103, the third connecting member S0 and the fourth connecting member S6 together selectively connect the first input shaft 12 to the second input shaft 14.

[0078] This achieves a highly efficient transmission system 1 because the number of idle gears in the transmission is minimized.

[0079] The transmission system 1 further includes a fifth coupling member S2, which includes a fifth synchronizer friction element, here a friction clutch. The fifth coupling member S2 has a ninth portion S2a connected to the output shaft 16, and a tenth portion S2b connected to the transmission drive of the transmission. In this example, the tenth portion S2b is connected to the first / second transmission drive 101. Specifically, the tenth portion S2b is connected to the output gear 101b of the first / second transmission drive 101.

[0080] The speed conversion transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e., the first connecting member C1 is closed, and the third, fourth, and fifth connecting members S0, S6, and S2 are closed to connect the first input shaft 12 to the output shaft 16 via the first / second transmission 101, then the first / second transmission 101 forms a first gear. Here, the formation of the first gear involves connecting the first input shaft 12 to the second input shaft 14 via the third / fourth transmission. The third / fourth transmission is idled, i.e., the sixth connecting member S5 is open.

[0081] The transmission can be configured such that if the second and fifth connecting members C2 and S2 are closed to connect the second input shaft 12 to the output shaft 16 via the first / second transmission 101, then the first / second transmission 101 forms a second gear. Here, the input gear of the first / second transmission 101a is fixedly connected to the second input shaft 14, but additional connecting members can be provided for selectively connecting the input gear 101a to the second input shaft 14. Forming the second gear does not require idling of other transmissions such as the third / fourth and fifth / sixth transmissions.

[0082] The transmission system 1 further includes a fifth coupling member S2, which includes a fifth synchronizer friction element, here a friction clutch. The sixth coupling member S2 has an eleventh part S5a and a twelfth part S5b, the eleventh part S5a being connected to the output shaft 16, and the twelfth part S5b being connected to the transmission drive of the transmission. In this example, the twelfth part S5b is connected to the third / fourth transmission drive 103. Specifically, the twelfth part S5b is connected to the output gear 103b of the third / fourth transmission drive 103.

[0083] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third and sixth connecting members S0 and S5 are closed to connect the first input shaft 12 and the output shaft 16 via the third / fourth transmission 103, then the third / fourth transmission 103 forms a third gear.

[0084] The speed change transmission can be configured such that if the second, fourth, and sixth connecting members C2, S6, and S5 are closed to connect the second input shaft 12 to the output shaft 16 via the third / fourth transmission 103, then the third / fourth transmission 103 forms a fourth gear.

[0085] The transmission system 1 further includes a seventh coupling member S3, which includes a seventh friction element and a seventh synchronizer, here a friction clutch. The seventh coupling member S3 has a thirteenth portion S3a and a fourteenth portion S3b, the thirteenth portion S3a being connected to the output shaft 16, and the fourteenth portion S3b being connected to the transmission drive of the transmission. In this example, the fourteenth portion S3b is connected to the fifth / sixth transmission drive 105. Specifically, the fourteenth portion S3b is connected to the output gear 105b of the fifth / sixth transmission drive 105.

[0086] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the seventh connecting member S3 is closed to connect the first input shaft 12 to the output shaft 16 via the fifth / sixth transmission 105, then the fifth / sixth transmission 105 forms the fifth gear.

[0087] The speed change transmission can be configured such that if the second, fourth, third, and seventh connecting members C2, S6, S0, and S3 are closed to connect the second input shaft 12 to the output shaft 16 via the fifth / sixth transmission 105, then the fifth / sixth transmission 105 forms the sixth gear.

[0088] A reverse speed change transmission can be formed by reversing the rotation direction of the input unit relative to the forward speed change transmission, for example, by using a first gearbox transmission. For example, the electric motor EM can be arranged to reverse the direction of the input unit.

[0089] As can be seen from Figure 1, the first connecting member C1 is positioned at the first end 42 of the transmission system 1. The second connecting member C2 is positioned at the opposite second end 44 of the transmission system 1. Here, the second end 44 is positioned on one side of the drive source. Here, the first and second speed change transmissions 38 and 40 are axially positioned between the first connecting member C1 and the second connecting member C2. More generally, the first and second speed change transmissions 38 and 40 are axially positioned between the first friction element and the second friction element. This allows for a compact construction of the transmission system.

[0090] The transmission is arranged to achieve continuous shifting through the corresponding first, second, third, fourth, fifth, and sixth gears by alternately engaging the first connecting member C1 and the second connecting member C2.

[0091] Figure 2 A schematic diagram of transmission system 1 is shown. Figure 2 The transmission system 1 shown is... Figure 1AThe transmission system shown differs in that it includes a reverse transmission drive 52, via which the first or second input shafts 12, 14 are connected to the output shaft 16, allowing the transmission 8 to operate in reverse gear. The reverse transmission drive 107 includes an input reverse gear 107a that is connected to or can be connected to the first input shaft 12 or the second input shaft 14. Here, the input reverse gear 107a can be connected to the first input shaft 12.

[0092] The reverse transmission 52 further includes an intermediate shaft 53, which includes first and second intermediate gears 53a and 53b, which are mounted to and rotatably fixed to each other on the intermediate shaft 53. The intermediate shaft 53 reverses the rotational direction of the first or second input shafts 12 and 14. The input reverse gear 107a meshes with the first intermediate gear 53a. The second intermediate gear 53b meshes with the output gear of another transmission. Here, the second intermediate gear 53b meshes with the output gear 101b of the first / second transmission 101.

[0093] In this example, if the third rotating member 28 of the planetary gear set 22 is braked, the input reverse gear 107a is engaged with the first input shaft 12, and the fifth connecting member S2 is closed, the transmission operates in reverse gear. In other words, the transmission operates in reverse gear via the reverse transmission device 52 and the first gear.

[0094] Figure 2 The transmission system 1 shown differs from the transmission system shown in Figure 1 in that the planetary gear set 22 is located on the second end 44 instead of the first end 44. This achieves a compact construction, especially for transmissions that include an additional intermediate shaft 53.

[0095] Figure 3 A schematic diagram of a transmission system 1 for a vehicle, particularly for a front-wheel drive vehicle, is shown. Figure 3 The transmission system 1 shown is with Figure 1AThe transmission system shown differs in that transmission 8 includes a linkage 58 (connecting gear section), sometimes referred to as a "jump". This linkage enables transmission 8 to operate in at least seven gears plus an optional reverse gear. Linkage 58 includes a separate linkage shaft 59 that extends substantially parallel to at least the first input shaft 12. The linkage includes a first linkage gear 58a, which is connected to or can be connected to the first input shaft 12 or the second input shaft 14, and a second linkage gear 58b, which is connected to or can be connected to the linkage shaft 59. The first linkage gear 58a meshes with the second linkage gear 58b. The second linkage gear 58b is rotatably fixedly connected to a third linkage gear 58c. Here, the second linkage gear 58b and the third linkage gear 58c are mounted on a common shaft. The third linkage gear 58c meshes with the input gear of the transmission drive. Here, the third linkage gear 59c meshes with the input gear 103a of the third / fourth transmission drive 103.

[0096] like Figure 3 The transmission system 1 shown includes an eighth connecting member S1, which here includes an eighth synchronizer. The eighth connecting member S1 has a fifteenth portion S1a and a sixteenth portion S1b, the fifteenth portion S1a being connected to the first input shaft 12, and the sixteenth portion S1b being connected to the transmission drive of the transmission. In this example, the sixteenth portion S1b is connected to the input gear 58a of the linkage drive 58.

[0097] In a compact configuration, the third synchronizer of the third connecting member S0 and the eighth synchronizer of the eighth connecting member S1 can form a dual synchronizer unit. This dual synchronizer unit allows selective engagement of either the third connecting member S0 or the eighth connecting member S1.

[0098] exist Figure 3 In the transmission system shown, the speed change transmission can be selected such that if the second, fourth, eighth and seventh connecting members C2, S6, S1 and S3 are closed to connect the second input shaft 14 to the output shaft 16 via the third / fourth transmission 103, the second input shaft 14 and the fifth / sixth / seventh transmission 105, then the fifth / sixth / seventh transmission 105 forms the seventh gear.

[0099] and Figure 1A , 1B Compared to the transmission system 1 shown in Figure 2, the linkage enables the transmission 8 to operate in a first auxiliary gear, wherein the auxiliary first gear is formed via the linkage. Thus, at least relative to... Figure 1A , 1B With respect to the first gear of the transmission system shown in Figure 2, a different gear ratio can be obtained than that of the first gear, such as a larger or smaller gear ratio.

[0100] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, fourth and fifth connecting members S0, S6 and S2 are closed to connect the first input shaft 12 to the output shaft 16 via the link transmission, the second input shaft 14 and the first / second transmission transmission 101, then the first / second transmission transmission 101 forms an auxiliary first gear.

[0101] Optionally, in the use of transmission system 1, neither the first gear, the auxiliary first gear, nor the second gear is used. For example, during continuous shifting, the first gear is skipped.

[0102] Figure 4A A schematic diagram of a transmission system 1 for a vehicle, particularly for a front-wheel drive vehicle, is shown. Figure 4B It shows Figure 4A Functional diagram of transmission system 1. Figure 4A , 4B The transmission system 1 shown is... Figure 1A , 1B The difference in the transmission system shown is that the transmission 8 includes a link drive 58, sometimes referred to as a "jump". Figure 4A , 4B The transmission system 1 shown is... Figure 3 The difference in the transmission system shown is that the connecting drive 58 is basically located on the output shaft, making it possible to omit it. Figure 3 The connecting shaft 59 and the third connecting gear 58c are shown. This achieves a particularly compact and robust construction. This connecting transmission allows the transmission 8 to operate with at least seven gears plus an optional reverse gear.

[0103] The linkage transmission includes a first linkage gear 58a and a second linkage gear 58b. The first linkage gear 58a is connected to or can be connected to a first input shaft 12 or a second input shaft 14, and the second linkage gear 58b is connected to or can be connected to an output shaft. The first linkage gear 58a and the second linkage gear 58b mesh. The second linkage gear 58b is rotatably and fixedly connected to one of the output gears of the transmission. Here, the second linkage gear 58b is rotatably and fixedly connected to the output gear 103b of the third / fourth transmission 103. Through this linkage transmission, the transmission system 1 can operate with seven transmissions plus a reverse transmission. Figure 4A , 4B As shown, transmission system 1 includes a fifth / sixth / seventh transmission drive unit, compared to which... Figure 1A , 1BThe diagram shows the fifth / sixth transmission. Both the second link gear 58b and the output gear 103b of the third / fourth transmission are mounted on a common link shaft 58c. The axis of rotation of the link shaft 58c coincides with the axis of rotation of the output shaft.

[0104] like Figure 4A , 4B The transmission system 1 shown includes an eighth coupling member S1, which includes an eighth synchronizer. The eighth coupling member S1 has a fifteenth portion S1a and a sixteenth portion S1b. The fifteenth portion S1a is connected to the first input shaft 12, and the sixteenth portion S1b is connected to the transmission drive of the transmission. In this example, the sixteenth portion S1b is connected to the input gear 58a of the linkage drive 58.

[0105] The speed change transmission can be configured such that if the second, fourth, eighth and seventh connecting members C2, S6, S1 and S3 are closed to connect the second input shaft 12 to the output shaft 16 via the third / fourth transmission 103, the second input shaft 14 and the fifth / sixth / seventh transmission 105, then the fifth / sixth / seventh transmission 105 forms the seventh gear.

[0106] In a compact configuration, the third synchronizer of the third connecting member S0 and the eighth synchronizer of the eighth connecting member S1 can form a dual synchronizer unit. This dual synchronizer unit allows selective engagement of either the third connecting member S0 or the eighth connecting member S1.

[0107] A reverse speed change transmission can be formed by reversing the rotational direction of the input unit relative to the forward speed change transmission, for example, by using a first gearbox transmission. For example, the electric motor EM can be arranged to reverse the direction of the input unit.

[0108] The reverse speed conversion transmission can alternatively be formed, for example, by means of a linkage transmission 58. Here, an intermediate gear can be provided between the first linkage gear 58a and the second linkage gear 58b to reverse the direction. Note that this configuration does not allow the transmission to operate in seventh gear.

[0109] and Figure 3 Similar to the transmission system 1 shown, the linkage enables the transmission 8 to operate in a first auxiliary gear, which is formed via the linkage. Thus, at least relative to... Figure 1A , 1B With respect to the first gear of the transmission system shown in Figure 2, a different gear ratio can be obtained than that of the first gear, such as a larger gear ratio.

[0110] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, fourth and fifth connecting members S0, S6 and S2 are closed to connect the first input shaft 12 to the output shaft 16 via the link transmission, the second input shaft 14 and the first / second transmission transmission 101, then the first / second transmission transmission 101 forms an auxiliary first gear.

[0111] Optionally, in the use of transmission system 1, one of the first gear, auxiliary first gear, and second gear may not be used. For example, during continuous shifting, the first gear may be skipped.

[0112] Figure 5A A schematic diagram of a transmission system for a vehicle is shown. Figure 5B It shows Figure 5A Functional diagram of transmission system 1. Figure 5A , 5B The transmission system 1 shown is... Figure 4A , 4B The difference in the transmission system 1 shown is the inclusion of a separate reverse transmission drive 52. This allows the transmission 8 to be operated in reverse without relying on, for example, the battery life of the electric motor. The transmission system 1 connects the first or second input shafts 12, 14 to the output shaft 16 via the reverse transmission drive 52 for operation in reverse gear. The reverse transmission drive 52 includes an intermediate shaft 53, which includes a first intermediate gear 53a and a second intermediate gear 53b, which are mounted on the intermediate shaft 53 and rotatably fixed to each other on the intermediate shaft 53. The intermediate shaft 53 reverses the rotational direction of the first or second input shafts 12, 14. The first intermediate gear 53a meshes with the input gear of the transmission drive. In this example, the first intermediate gear 53a meshes with the input gear 103a of the third / fourth transmission drive 103. The second intermediate gear 53b meshes with the output gear of another transmission drive. Here, the second intermediate gear 53b meshes with the output gear 101b of the first / second transmission 101.

[0113] like Figure 5A , 5B The transmission system 1 shown includes a ninth connecting member S4, which includes a ninth synchronizer. The ninth connecting member S4 has a seventeenth part S4a and an eighteenth part S4b, the seventeenth part S4a being connected to a first intermediate gear 53a and the eighteenth part S4b being connected to a second intermediate gear 53b.

[0114] If the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, ninth and fifth connecting members S0, S4, S4 and S2 are closed, the transmission operates in the reverse gear.

[0115] Alternatively, if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the eighth, ninth and fifth connecting members S1, S4, S2 are closed, the transmission operates in the reverse gear.

[0116] A dedicated actuation device can be provided for actuating the ninth coupling member S4 independently of any other coupling member in the transmission system 1, for example, engaging and disengaging the ninth coupling member S4. This minimizes the shift time between any forward and reverse gears. It also provides a modular component of the transmission system, where a reverse gear can be provided as an optional added feature. For example, in an electrically driven vehicle, the ninth coupling member S4 can be omitted, as such a vehicle can be reverse-driven by reversing the rotation direction of the electric motor. The ninth coupling member S4 can be, for example, hydraulically and / or electromechanically actuated.

[0117] In this example, the parking brake component P is included and disposed on the intermediate shaft 53.

[0118] Figure 6 A schematic diagram of a transmission system 1 for a vehicle is shown. Figure 6 The transmission system 1 shown is... Figure 5A , 5B The difference in the transmission system shown is that the planetary gear set 22 is located on the second end 44. The reverse transmission device is omitted in transmission system 1, but it is understood that a reverse transmission drive may be included.

[0119] Figure 7 A schematic diagram of transmission system 1 is shown. Figure 7 The transmission system 1 shown is... Figure 6 The difference in the transmission system shown is that the axial sequence of the transmission drive is reversed.

[0120] Figure 8A A schematic diagram of transmission system 1 is shown. Figure 8B It shows Figure 8A Functional diagram of transmission system 1. Figure 8A , 8B The transmission system 1 shown is... Figure 1A , 1BThe difference in the illustrated transmission system is that the planetary gear set 22 includes a fourth rotating member 29. This fourth rotating member 29 is formed here by a second sun gear. In this example, the first rotating member 24 is connected to the input section 2. The second rotating member 26 is connected to the first input shaft 12. The third rotating member 28 is connected to the first connecting member C1. The fourth rotating member is connected to another connecting member C3. The first connecting member C1 includes a friction brake, such as a wet or dry plate friction brake, which is, for example, normally open. Here, the third connecting member C3 is a friction brake, such as a wet or dry plate friction brake, which is, for example, normally open. Figure 8A , 8B The transmission system 1 can be operated in eight gears, plus an optional reverse gear.

[0121] Here, the first and second speed conversion transmissions 38 and 40 are axially positioned between, on one hand, the first and further connecting members C1 and C3, and on the other hand, the second connecting member C2. In this example, the second connecting member C2 is axially positioned between the rotating member and the first connecting member C1. It is understood that this is also possible in embodiments where the planetary gear set 22 includes three rotating members and a friction element.

[0122] It is understood that, in the embodiment shown in the foregoing figures, the planetary gear set may also be provided with at least four rotating members and first and further connecting members C1, C3.

[0123] like Figure 8A , 8B As shown, the transmission includes a first / second transmission drive 101, a third / fourth / fifth transmission drive 103, and a sixth / seventh / eighth transmission drive 105.

[0124] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, fourth and fifth connecting members S0, S6 and S2 are closed to connect the first input shaft 12 to the output shaft 16 via the first / second transmission 101, then the first / second transmission 101 forms a first gear.

[0125] The speed-changing transmission can be configured such that if the second and fifth connecting members C2 and S2 are closed to connect the second input shaft 12 to the output shaft 16 via the first / second transmission 101, then the first / second transmission 101 forms a second gear. Here, the input gear of the first / second transmission 101a is fixedly connected to the second input shaft 14, but additional connecting members can be provided for selectively connecting the input gear 101a to the second input shaft 14. Forming the second gear does not require the idling of other transmissions, such as the third / fourth / fifth and sixth / seventh / eighth transmissions.

[0126] The speed change transmission can be configured such that if the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third and sixth connecting members S0 and S5 are closed to connect the first input shaft 12 to the output shaft 16 via the third / fourth / fifth transmission 103, then the third / fourth / fifth transmission 103 forms the third gear.

[0127] The speed change transmission can be configured such that if the second, fourth, and sixth connecting members C2, S6, and S5 are closed to connect the second input shaft 12 to the output shaft 16 via the third / fourth / fifth transmission 103, then the third / fourth / fifth transmission 103 forms a fourth gear.

[0128] The speed change transmission can be configured such that if the fourth rotating member 29 of the planetary gear set 22 is braked, i.e., the further connecting member C3 is closed, and the third and sixth connecting members S0 and S5 are closed to connect the first input shaft 12 to the output shaft 16 via the third / fourth / fifth transmission 103, then the third / fourth / fifth transmission 103 forms the fifth gear.

[0129] The speed change transmission can be configured such that if the third rotating member 29 of the planetary gear set 22 is braked, and the second and seventh connecting members C2 and S3 are closed to connect the first input shaft 12 to the output shaft 16 via the fifth / sixth / seventh transmission 105, then the sixth / seventh / eighth transmission 105 forms the sixth gear.

[0130] The speed change transmission can be configured such that if the second, fourth, third and seventh connecting members C2, S6 and S5 are closed to connect the second input shaft 12 to the output shaft 16 via the third / fourth / fifth transmission 105, then the sixth / seventh / eighth transmission 105 forms the seventh gear.

[0131] The speed change transmission can be configured such that if the fourth rotating member 29 of the planetary gear set 22 is braked and the seventh connecting member S3 is closed to connect the first input shaft 12 to the output shaft 16 via the fifth / sixth / seventh transmission 105, then the sixth / seventh / eighth transmission 105 forms the eighth gear.

[0132] Figure 9A A schematic diagram of transmission system 1 is shown. Figure 9B It shows Figure 9A Functional diagram of transmission system 1. Figure 9A , 9B The transmission system 1 shown is... Figure 1A , 1B The difference in the transmission system shown is that the output gear 103b of the third / fourth transmission 103 is mounted on a further output shaft 17, which is separate from the first output shaft 16. An intermediate gear 53b is also mounted on the further output shaft 17, which is rotatably connected to the output gear 103b of the third / fourth transmission 103. The intermediate gear 53b meshes with the output gear 101b of the first / second transmission 101.

[0133] To enable the transmission 8 to operate in reverse, the transmission includes a ninth connecting member S4, which includes a ninth synchronizer. The ninth connecting member S4 has a seventeenth portion S4a, which is connected to the output gear 103b of the third / fourth transmission 103, and an eighteenth portion S4b, which is connected to the intermediate gear 53b.

[0134] If the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, ninth and fifth connecting members S0, S4 and S2 are closed, the transmission operates in the reverse gear.

[0135] A dedicated actuation device can be provided to actuate the ninth coupling member S4 independently of any other coupling member in the transmission system 1, for example, engaging and disengaging the ninth coupling member S4. This minimizes the shift time between any forward and reverse gears. It also provides a modular component of the transmission system, where a reverse gear can be provided as an optional added feature. For example, in an electrically driven vehicle, the ninth coupling member S4 can be omitted, as such a vehicle can be reverse-driven by reversing the rotation direction of the electric motor. The ninth coupling member S4 can be, for example, hydraulically and / or electromechanically actuated.

[0136] The transmission system 1 also includes a sixth coupling member S5, which includes a sixth synchronizer. The sixth coupling member S5 has an eleventh portion S5a and a twelfth portion S5b. The eleventh portion S5a is connected to a further output shaft 17, and the twelfth portion S5b is connected to the transmission drive of the transmission. In this example, the twelfth portion S5b is connected to the third / fourth transmission drive 103. Specifically, the twelfth portion S5b is connected to the output gear 103b of the third / fourth transmission drive 103. Here, the output gear 103b of the third / fourth transmission drive is connected to or may be connected to the further output shaft 17.

[0137] Figure 10A A schematic diagram of transmission system 1 is shown. Figure 10B It shows Figure 10A Functional diagram of transmission system 1. Figure 10A , 10B The transmission system 1 in Figure 8A , 8B The difference in the transmission system shown is that it is equipped with, for example, Figure 3 The linkage 58 shown includes a separate linkage shaft extending at least substantially parallel to the first input shaft 12. The reversing mechanism is omitted in FIG10. The transmission can be reversed, for example, by reversing the rotational direction of the input section, or by reversing the rotational direction of the electric motor EM.

[0138] Figure 11A A schematic diagram of transmission system 1 is shown. Figure 11B It shows Figure 11A Functional diagram of transmission system 1. Figure 11A , 11B The transmission system 1 shown is... Figure 10A , 10B The difference in the transmission system shown is that an intermediate gear 53b is provided on the second output shaft 17 for operating the transmission with a reverse transmission drive. The intermediate gear 53b can be rotatably connected to the output gear 103b of the third / fourth transmission drive 103. Here, the intermediate gear 53b meshes with the output gear 101b of the first / second transmission drive 101.

[0139] If the third rotating member 28 of the planetary gear set 22 is braked, i.e. the first connecting member C1 is closed, and the third, ninth and fifth connecting members S0, S4 and S2 are closed, the transmission operates in the reverse gear.

[0140] Alternatively or additionally, if the third rotating member 28 of the planetary gear set 22 is braked, i.e., the first connecting member C1 is closed, and the eighth, ninth and fifth connecting members S1, S4, S2 are closed, the transmission operates in the reverse gear.

[0141] The invention is described herein with reference to specific examples of embodiments thereof. However, it will be apparent that various modifications and changes can be made therein without departing from the spirit of the invention. For the purposes of clarity and concise description, features are described herein as part of the same or different examples or embodiments; however, alternative embodiments having combinations of all or some of the features described in these different embodiments are also contemplated.

[0142] Transmission systems can be implemented in vehicles such as cars, recreational vehicles, trucks, buses, bicycles, motorcycles, lawnmowers, agricultural vehicles, construction vehicles, golf carts, handcarts, and robotic vehicles. Other vehicles are also possible. The illustrated embodiment relates to a vehicle with four wheels, but vehicles with different numbers of wheels can also be utilized. It can also be seen that multiple transmission systems are included in the vehicle.

[0143] Actuation of the connecting components can be achieved using a hydraulic actuation system. However, other embodiments may include actuation using mechanical, electromechanical, or electrohydraulic systems. Combinations of actuation systems for different components of the transmission are also conceivable.

[0144] The electric motor or engine of a vehicle including the transmission system according to the invention can be or include any combination of an internal combustion engine and an electric motor. Other electric motors and engines are also possible, such as fuel cell motors. In some embodiments, the electric motor is a hybrid engine and / or may include multiple types of engines and / or electric motors. For example, a hybrid electric vehicle may include a gasoline engine and an electric motor. Other examples are possible.

[0145] The invention is described herein with reference to specific examples of embodiments thereof. However, it will be apparent that various modifications, variations, substitutions, and alterations can be made therein without departing from the spirit of the invention. For the purpose of clarity and concise description, features are described herein as part of the same or separate embodiments; however, alternative embodiments having combinations of all or some of the features described in these separate embodiments are also contemplated and understood to fall within the framework of the invention as outlined by the claims. Therefore, the specification, drawings, and examples should be considered illustrative rather than restrictive. The invention is intended to cover all substitutions, modifications, and variations falling within the spirit and scope of the appended claims. Furthermore, many of the elements described are functional entities that can be implemented as independent or distributed components or in combination with other components in any suitable combination and location.

[0146] In the claims, any reference signs enclosed in parentheses should not be construed as limiting the claims. The word “comprising” does not exclude the presence of other features or steps besides those listed in the claims. Furthermore, the words “a” and “an” should not be construed as limited to “only one” but are used to mean “at least one” and do not exclude multiples. The mere fact that certain means are stated in mutually different claims does not indicate that combinations of these means cannot be advantageously used.

Claims

1. A transmission system for a front-wheel drive vehicle, comprising an input portion arranged for connection to a drive source and an output portion arranged for connection to a load, and including: The transmission includes: The output shaft connected to the output section, A first input shaft and a first speed conversion transmission device connecting the first input shaft to the output shaft, and The second input shaft and the second speed conversion transmission device that connects the second input shaft to the output shaft. Furthermore, the first speed change transmission device and the second speed change transmission device together comprise a group of transmission transmission devices, the group of transmission transmission devices including at least a first transmission transmission device, a second transmission transmission device, and a third transmission transmission device, and each of the first transmission transmission device, the second transmission transmission device, and the third transmission transmission device includes an input gear and an output gear, wherein the input gear of the first transmission transmission device is connected to a first input shaft, the input gear of the second transmission transmission device is connected to a second input shaft, and the output gear of each transmission transmission device can be connected to the output shaft; A first connecting member including a first friction element, the first connecting member having a first portion and a second portion, the first portion being connected to the input portion, and the second portion being connected to the first input shaft of the transmission. The system includes a second connecting member comprising a second friction element, the second connecting member having a third portion and a fourth portion, the third portion being connected to the input section, and the fourth portion being connected to the second input shaft of the transmission. The third connecting member has a fifth part and a sixth part, the fifth part being connected to the first input shaft, and the sixth part being directly connected to the input gear of the third transmission device. A fourth connecting member, having a seventh portion and an eighth portion, wherein the seventh portion is connected to the second input shaft, and the eighth portion is directly connected to the input gear of the third transmission gearbox. A linkage transmission device includes a first linkage gear connected to or connectable to the first input shaft or the second input shaft, and a second linkage gear, wherein the first linkage gear meshes with the second linkage gear, and wherein the second linkage gear is rotatably connected to a gear of the third transmission transmission device.

2. The transmission system according to claim 1, characterized in that, The transmission includes only one output shaft.

3. The transmission system according to claim 1, characterized in that, The third transmission drive is a third / fourth transmission drive used to enable the transmission to operate in the third or fourth gear.

4. The transmission system according to claim 3, characterized in that, The second transmission drive is a first / second transmission drive for operating the transmission in a first or second gear, and wherein the first transmission drive is a fifth / sixth transmission drive for operating the transmission in a fifth or sixth gear, or wherein the first transmission drive is a fifth / sixth / seventh transmission drive for operating the transmission in a fifth or sixth gear.

5. The transmission system according to claim 1, characterized in that, The first and / or second speed conversion transmission device is axially disposed between the first friction element and the second friction element.

6. The transmission system according to claim 5, characterized in that, The first friction element is disposed at a first end of the transmission, and / or the second friction element is disposed at the opposite second end of the transmission.

7. The transmission system according to claim 1, characterized in that, The first and / or second connecting member includes a planetary gear set comprising at least three rotating members and a friction brake.

8. The transmission system according to claim 7, characterized in that, The rotating component of the planetary gear set is directly connected to the gear of the first speed change transmission device or the second speed change transmission device.

9. The transmission system according to claim 1, characterized in that, The first and / or second and / or third and / or fourth connecting member includes a friction clutch.

10. The transmission system according to claim 1, characterized in that, The first speed conversion transmission device includes a reverse transmission device.

11. The transmission system according to claim 1, characterized in that, The transmission does not have a reverse transmission drive.

12. The transmission system according to claim 1, characterized in that, Both the second link gear and the output gear of the third transmission are mounted on a common link shaft.

13. The transmission system according to claim 12, characterized in that, The axis of rotation of the link shaft coincides with the axis of rotation of the output shaft.

14. The transmission system according to claim 1, characterized in that, The second link gear is rotatably connected to the output gear of the third / fourth transmission.

15. The transmission system according to claim 1, characterized in that, in, The third transmission gear unit j is a third / fourth / fifth transmission gear unit used to enable the transmission to operate in the third, fourth or fifth gear.

16. The transmission system according to claim 15, characterized in that, The second transmission drive is a first / second transmission drive used to enable the transmission to operate in a first or second gear.

17. The transmission system according to claim 16, characterized in that, The first transmission is a sixth / seventh / eighth transmission, used to enable the transmission to operate in the sixth, seventh or eighth gear.

18. A vehicle comprising a transmission system according to claim 1.

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