Two-speed manual transmission with double synchro and drivetrain

Abstract

Transmission assembly (1) for a drive train of a motor vehicle, comprising a torque input shaft (2) via which the torque can be selectively transmitted to an output spur gear (6) through a planetary gear set (3) or a separate input spur gear (4), wherein a shift fork-like switching device (5) is provided for selectively establishing a torque-transmitting connection between a planet carrier (21) of the planetary gear set (3) and an output spur gear fixed component on the one hand, and between the torque input shaft fixed input spur gear (4) and the output spur gear fixed component on the other hand, characterized in that the output spur gear fixed component is designed as a transmission spur gear (7) divided into two transmission spur gear halves (8, 9), wherein the transmission spur gear halves (8, 9) are arranged on both sides of the output spur gear.wherein the switching device (5) has a first synchronizing ring (10) and a second synchronizing ring (11), wherein the first synchronizing ring (10) is designed / arranged to establish torque transmission between the planet carrier (21) and the first transmission spur gear half (8) as required, and the second synchronizing ring (11) is designed / arranged to establish torque transmission between the input spur gear (4) and the second transmission spur gear half (9) as required, and the arrangement of the individual parts is such that when the switching device (5) is actuated, torque can be transmitted either only via the first synchronizing ring (10) or the second synchronizing ring (11), and the output spur gear (6) is arranged axially between the two synchronizing rings (10, 11).

Description

[0001] The invention relates to a transmission structure for a drive train of a motor vehicle, such as a passenger car, a truck or another commercial vehicle, with a torque introduction shaft, via which torque can be selectively transferred to an output spur gear by means of a planetary gear or a separate input spur gear.

[0002] The previously known DE 10 2014 223 502 A1 discloses a drive arrangement comprising an electric motor, wherein the electric motor defines a first axis with a rotor shaft, a differential device defining a second axis, wherein the first and second axes are arranged parallel and offset from one another, and a gear section having at least two gears. The gear section is arranged in a torque path between the electric motor and the differential device coaxially to one of the two aforementioned axes. Furthermore, the drive arrangement comprises a gear stage section having an input gear and an output gear, wherein the input gear is arranged coaxially to the first axis and the output gear is arranged coaxially to the second axis. The gear stage section has an intermediate gear device, wherein the intermediate gear device engages with the input gear and the output gear.Furthermore, the gear stage section has exactly one input gear.

[0003] From an older patent application DE 10 2018 112 880 A1, a drive device for a motor vehicle is known, comprising an electric machine which is operatively connected to a transmission device via a drive shaft, wherein the transmission device has at least one planetary stage, a switching device and a differential stage with two output shafts, wherein the planetary stage has a first planetary set with a plurality of planetary gears, wherein the planetary gears of the planetary set are rotatably arranged on a planet carrier and mesh with a first sun gear and a ring gear, wherein the first sun gear is connected in a rotationally fixed manner to the drive shaft, wherein the ring gear is connected in a rotationally fixed manner to a second sun gear, and wherein the planet carrier is operatively connected to the differential stage at least via an intermediate shaft, wherein the switching device is designed toin a first gear stage, to connect the second sun gear in a rotationally fixed manner to a housing of the transmission device, and in a second gear stage, to connect the second sun gear in a rotationally fixed manner to the planet carrier.

[0004] DE 10 2016 216 120 A1 discloses a two-stage planetary drive for a transfer case of a motor vehicle, comprising an input shaft, a planetary carrier with planetary gears, a ring gear, a sun gear, and an axially displaceable shift sleeve. The planetary drive is arranged concentrically within a drive gear. The planetary drive is characterized in that the shift sleeve is non-rotatably coupled to the input shaft. In a first end position, the shift sleeve non-rotatably couples the input shaft to the sun gear, and in a second end position, the input shaft non-rotatably couples the planetary carrier.

[0005] US 7 175 558 B2 and US 5 711 740 A each show a switchable transmission.

[0006] DE 10 2017 115 770 A1 shows a drive device with at least one electric machine, a planetary gear, with at least a first clutch and an output shaft, wherein by means of the first clutch a first power-transmitting operative connection between a rotor shaft of the electric machine and a first connecting shaft of the planetary gear can be engaged or disengaged and a first gear connection is formed between the first connecting shaft and the output shaft of the planetary gear, and wherein the planetary gear has at least one first planetary stage with at least one first sun gear, with a first ring gear and with at least one first set of first planet gears in tooth engagement with the first sun gear and the first ring gear, wherein the rotor shaft, the first connecting shaft and the output shaft have a common central axis, and wherein the output shaft is guided coaxially through the rotor shaft.

[0007] DE 10 2018 111 798 A1 shows a drive device with an electric machine, in particular for an electrically powered motor vehicle.The drive device for a motor vehicle comprises an electric machine which is operatively connected to a transmission device via a drive shaft, wherein the transmission device has at least one planetary stage, a switching device and a differential stage with two output shafts, wherein the planetary stage has a first planetary set with a plurality of planetary gears, wherein the planetary gears of the planetary set are rotatably arranged on a planet carrier and mesh with a first sun gear and with a ring gear which is stationary on a housing of the transmission device, wherein the switching device is designed to couple the planet carrier to the differential stage at least via an intermediate shaft in a first gear stage and to couple a second sun gear, which is connected in a rotationally fixed manner to the drive shaft, to the differential stage at least via the intermediate shaft in a second gear stage.In particular, the switching device is arranged in a plane with the differential stage, this plane being arranged perpendicular to the drive shaft.

[0008] Since it has been found that a permanently stationary ring gear has disadvantages, the aim of the present invention is to remedy this situation and, in particular, to provide an improved bearing arrangement to avoid the planetary gear having to rotate in a block. The objective of the present invention is therefore to achieve a better bearing arrangement and a better moment of inertia behavior.

[0009] The object is achieved by a device according to claim 1.

[0010] This object is achieved according to the invention in a generic transmission structure in that a shift fork-like switching device is provided for selectively establishing a torque-transmitting connection between a planet carrier of the planetary gear and a component fixed to the output spur gear on the one hand and between the input spur gear fixed to the torque introduction shaft and the component fixed to the output spur gear on the other hand.

[0011] In other words, the inventive solution to the problem lies in the introduction of a double synchronizer, which is actuated by a double shift fork. This "double synchronizer" is located to the left and right of the spur gear. The "double synchronizer" thus consists of two standard synchronizers, each of which shifts a gear. A first synchronizer ring locks the planetary carrier against the relevant spur gear, while the second synchronizer ring is open. First gear is then engaged. Second gear is engaged when the first synchronizer ring is open and the second synchronizer ring locks the input shaft against the spur gear.

[0012] It is advantageous if the component fixed to the output spur gear is designed as a one-piece / integral transmission spur gear or a transmission spur gear split into two transmission halves, with the transmission spur gear halves being arranged on either side of the output spur gear, i.e., axially before or after the output spur gear. It should be noted that a transmission spur gear half does not exactly mean a division of a transmission spur gear into two equal halves, but also a division deviating from a 50 / 50 division. If such a division into two transmission spur gear halves is used instead of a one-piece / integral transmission spur gear, a particularly clever actuation can be achieved.

[0013] It is advantageous if the shifting device has a first synchronizer ring and a second synchronizer ring, which can also be referred to as shift sleeves. The first synchronizer ring is designed and arranged to establish torque transmission as needed between the planet carrier and the first spur gear half, and the second synchronizer ring is designed and arranged to establish torque transmission as needed between the input spur gear and the second spur gear half. The selective actuation can then be designed to be particularly robust.

[0014] To avoid undesired switching states, it is advantageous if the individual components are arranged in such a way that, when the switching device is actuated, torque can be transmitted only via the first synchronizer ring or only via the second synchronizer ring. This means that either one or the other synchronizer ring is in the power flow.

[0015] It has also proven effective if the output spur gear is arranged axially between the two synchronizer rings.

[0016] Advantageous embodiments are claimed in the subclaims and are explained in more detail below.

[0017] An advantageous embodiment is also characterized in that a differential gear is connected upstream of the output spur gear, via which torque can be transmitted via two output shafts.

[0018] If an intermediate gear with at least one intermediate spur gear / fixed spur gear is present between the output spur gear and the differential gear, the design of the gear structure according to requirements is simplified.

[0019] It is also expedient if the intermediate gear has a first fixed spur gear with a larger circumference, which is connected upstream of a fixed spur gear with a smaller circumference in the power flow.

[0020] It is beneficial for good functioning if the ring gear is (permanently) fixed to the housing.

[0021] The invention also relates to a drive train of a motor vehicle with at least one drive unit, such as an electric machine and / or an internal combustion engine, which drives a torque introduction shaft in order to supply torque through a transmission corresponding to the transmission structure of the invention.

[0022] The invention is explained in more detail below with the aid of a drawing. The basic design of the transmission structure is shown schematically. Shown are: Fig. 1 shows a first embodiment of a transmission structure according to the invention in the first gear position, and Fig. 2 the gearbox structure Fig. 1 in operating position in second gear.

[0023] The figures are merely schematic and serve only to clarify the invention. The same elements are designated by the same reference numerals.

[0024] In Fig. Figure 1 shows a first embodiment of a transmission assembly 1 according to the invention. The transmission assembly 1 is intended for use in a drive train (not shown in full) of a motor vehicle, in particular a passenger car. Torque, e.g., from an internal combustion engine and / or an electric motor, is transferred to a torque introduction shaft 2, which can also be referred to as an input shaft. Torque can be transferred to a planetary gear 3 via the torque introduction shaft. However, an input spur gear 4 is also mounted on the torque introduction shaft 2 in a rotationally fixed manner. The mounting used here also includes means for axially fastening the input spur gear 4 to the torque introduction shaft 2.

[0025] Depending on the switching position of a switching device 5, torque is transmitted either from the right side or from the left side into Fig. 1 to an output spur gear 6. In particular, torque is transmitted via a transmission spur gear 7. The transmission spur gear 7 is divided into two essentially equal-sized transmission spur gear halves 8 and 9.

[0026] The switching device 5 is designed like a shift fork and has two synchronizer rings 10 and 11. The two synchronizer rings 10 and 11 are connected to each other via a link 12.

[0027] In all shift positions, the output spur gear 6 transmits torque to an intermediate gear 13, namely to a first fixed spur gear 14 and, via an intermediate shaft 15, to a second fixed spur gear 16. The second fixed spur gear 16 then transmits torque to a differential gear 17. The input torque 18 is thus divided into two partial output torques 19 and 20.

[0028] It is noteworthy that a planet carrier 21 of the planetary gear 3, which supports the planets / planetary gears 22, can be connected to the first transmission spur gear half 8 via the first synchronizer ring 10, whereas the input spur gear 4 can be connected to the first transmission spur gear half 9 via the second synchronizer ring 11.

[0029] It is noticeable that a ring gear 23 is supported on a housing 24. A sun gear of the planetary gear 3 is designated by the reference numeral 25.

[0030] When compared with the Fig.2 it is noticeable that only one of the two synchronizer rings 10 and 11 can be present in the torque flow. List of reference symbols 1 Gearbox structure 2 Torque introduction shaft 3 planetary gears 4 Input spur gear 5 Switching device 6 Output spur gear 7 Transmission spur gear 8 Transmission spur gear half 9 Transmission spur gear half 10 first synchronizer ring (right of the transmission spur gear) 11 second synchronizer ring (left of the transmission spur gear) 12 backdrop 13 intermediate gear 14 first fixed spur gear 15 Intermediate shaft 16 second fixed spur gear 17 differential gears 18 Input torque 19 Partial output torque 20 partial output torque 21 planet carrier 22 Planet / planetary gear 23 ring gear 24 housings 25 Sun / Sun Wheel

Claims

[1] Gearbox structure (1) for a drive train of a motor vehicle, with a torque introduction shaft (2) via which the torque can be selectively transferred to an output spur gear (6) by a planetary gear (3) or a separate input spur gear (4), wherein a shift fork-like switching device (5) is provided for selectively establishing a torque-transmitting connection between a planet carrier (21) of the planetary gear (3) and a component fixed to the output spur gear on the one hand and between the input spur gear (4) fixed to the torque introduction shaft and the component fixed to the output spur gear on the other hand, characterized bythat the component fixed to the output spur gear is designed as a transmission spur gear (7) divided into two transmission spur gear halves (8, 9), wherein the transmission spur gear halves (8, 9) are arranged on both sides of the output spur gear, wherein the switching device (5) has a first synchronizer ring (10) and a second synchronizer ring (11), wherein the first synchronizer ring (10) is designed / arranged for establishing a torque transmission between the planet carrier (21) and the first transmission spur gear half (8) as required, and the second synchronizer ring (11) is designed / arranged for establishing a torque transmission between the input spur gear (4) and the second transmission spur gear half (9) as required, and the arrangement of the individual parts is such thatthat when the switching device (5) is actuated, torque can be transmitted either only via the first synchronizer ring (10) or the second synchronizer ring (11) and the output spur gear (6) is arranged axially between the two synchronizer rings (10, 11). [2] Gearbox assembly (1) according to claim 1, characterized by that a differential gear (17) is connected upstream of the output spur gear (6), via which torque (19, 20) can be transferred to two output shafts. [3] Gearbox assembly (1) according to claim 2, characterized by that an intermediate gear (13) with at least one intermediate spur gear / fixed spur gear (14, 16) is present between the output spur gear (6) and the differential gear (17). [4] Gearbox assembly (1) according to claim 3, characterized by that the intermediate gear (13) has a first fixed spur gear (14) with a larger circumference, which is connected upstream of a fixed spur gear (16) with a smaller circumference in the power flow. [5] Gear assembly (1) according to one of claims 1 to 4, characterized by that a ring gear (23) of the planetary gear (3) is fixed to the housing (24). [6] Drive train of a motor vehicle with at least one drive unit which drives a torque introduction shaft (2) in order to transmit torque through a transmission corresponding to the transmission structure according to one of the preceding claims.

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