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CN-121993565-A - Transmission device for vehicle

CN121993565ACN 121993565 ACN121993565 ACN 121993565ACN-121993565-A

Abstract

A transmission device (300) for a vehicle includes an input member (132) drivingly connected to an electric motor, a first planetary gear system (140) including a first sun gear (141), a first ring gear (144) rotatably connected to the input member through a first sleeve (146) rotatably connected to an output member (81) and a second sleeve (145), respectively, a crawler unit (390) drivingly connected between the first planetary gear system (140) and the output member, the first sleeve configured to selectively rotatably connect the first sun gear to a stationary member (149 a,149 b), the second sleeve configured to selectively rotatably connect the first ring gear to the stationary member via a third sleeve (395) rotatably connected to the stationary member and configured to selectively rotatably connect one gear member of the crawler unit to the stationary member to rotate the first ring gear in an opposite direction to the first planetary gear carrier.

Inventors

  • John Falkesong
  • Anders Heidman

Assignees

  • 沃尔沃卡车集团

Dates

Publication Date
20260508
Application Date
20251028
Priority Date
20241108

Claims (15)

  1. 1. A transmission arrangement (300, 9300) for a vehicle (1), comprising: An input member (132, 8132) configured to be drivingly connected to the electric motor (10, 810), -A first planetary gear system (140) comprising a first sun gear (141), a first ring gear (144) and a first planet carrier (142) carrying a first set of planet gears (143), wherein the first sun gear (141) and the first ring gear (144) are selectively rotatably connectable to the input member (132, 8132) by means of a first sleeve (146) and a second sleeve (145), respectively, and wherein the first planet carrier (142) is rotatably connected to the output member (81, 981), A crawler unit (390) comprising a plurality of gear members, the crawler unit (390) being configured to selectively drivingly connect the first ring gear (144) to the output member (81, 981), Wherein the first sleeve (146) is further configured to selectively rotationally connect the first sun gear (141) to a stationary member (149 a, 149 b) of the transmission device, and wherein the second sleeve (145) is further configured to selectively rotationally connect the first ring gear (144) to the stationary member (149 a, 149 b) via a third sleeve (395), Wherein the third sleeve (395) is rotationally connected to the stationary member (149 a, 149 b), and wherein the third sleeve (395) is further configured to selectively rotationally connect one of the plurality of gear members of the crawler unit (390) to the stationary member (149 a, 149 b) to rotate the first ring gear (144) in an opposite direction compared to a rotational direction of the first planet carrier (142).
  2. 2. The transmission arrangement of claim 1, wherein the third sleeve (395) is axially displaceable relative to the stationary member (149 a, 149 b) between a first position in which it is engageable with the second sleeve (145) and a second position in which it rotationally connects the one of the plurality of gear members of the creeper unit (390) to the stationary member (149 a, 149 b), Preferably, wherein in its second position, the third sleeve (395) is not engageable with the second sleeve (145).
  3. 3. The transmission device according to claim 2, further comprising a first shift lever (51) movably connected to a first shift fork (5) configured to move the first sleeve (146), a second shift lever (61) movably connected to a second shift fork (6) configured to move the second sleeve (145), and a third shift lever (71) movably connected to the third shift fork (7) configured to move the third sleeve (395).
  4. 4. A transmission arrangement according to claim 3, wherein the first, second and third shift forks (5, 6, 7) are pivoting shift forks.
  5. 5. The transmission arrangement according to claim 3 or 4, wherein the first shift lever (51) is configured to move the first sleeve (146) between a first position in which the first sleeve rotationally connects the first sun gear (141) to the stationary member (149 a, 149 b), a neutral position and a second position in which the first sleeve rotationally connects the first sun gear (141) to the input member (132, 8132).
  6. 6. The transmission arrangement according to any one of claims 3-5, wherein the second shift lever (61) is configured to move the second sleeve (145) between a first position in which the second sleeve rotationally connects the first ring gear (144) to the input member (132, 8132), a neutral position and a second position in which the second sleeve is engageable with the third sleeve (395).
  7. 7. The transmission arrangement according to claims 5 and 6, wherein the first and second shift levers (51, 61) are arranged to physically prevent simultaneous positioning of the first sleeve (146) in its first position and positioning of the second sleeve (145) in its second position, and wherein the first and third shift levers (51, 71) are arranged to physically prevent simultaneous positioning of the first sleeve (146) in its first position and positioning of the third sleeve (395) in its second position.
  8. 8. The transmission arrangement according to claim 7, wherein the first and second shift levers (51, 61) are coaxial and have shift lever ends (51 e, 61 e) that are configured to contact each other and prevent simultaneous movement of the first sleeve (146) to its first position and movement of the second sleeve (145) to its second position, and/or Wherein the first shift lever (51) and the third shift lever (71) are coaxial and have shift lever ends (51 e, 71e 1) that are configured to contact each other and prevent the first sleeve (146) from moving to its first position and the third sleeve (395) from moving to its second position at the same time.
  9. 9. The transmission arrangement according to any one of claims 3 to 8, wherein at least one of the shift levers (51, 61, 71) comprises at least one lateral extension (51 x1,51 x2, 61x1, 61x2, 71x1, 71x 2), each lateral extension (51 x1,51 x2, 61x1, 61x2, 71x1, 71x 2) being configured to be in contact with a portion of another one of the shift levers (51, 61, 71).
  10. 10. The transmission arrangement according to any one of claims 3 to 9, wherein the first, second and third shift levers (51, 61, 71) are arranged to physically prevent the first sleeve (146) from being rotationally connected with the input member (132, 8132), the second sleeve (145) with the input member (132, 8132) and the third sleeve (395) with the one of the plurality of gear members of the crawler unit (390) at the same time.
  11. 11. The transmission arrangement of claim 10, wherein the second and third shift levers (61, 71) are configured to contact each other and prevent the third sleeve (395) from moving to its second position when the second sleeve (145) rotationally connects the input member (132, 8132) to the first ring gear (144) and vice versa, Preferably, wherein the second shift lever (61) and the third shift lever (71) are coaxial and have shift lever ends (61 e2, 71e 1) configured to contact each other.
  12. 12. The transmission arrangement of any one of the preceding claims, wherein the crawling unit (390) comprises a second planetary gear system (390), the plurality of gear members of the crawling unit (390) comprising a second sun gear (391), a second ring gear (394) and a second planet carrier (392) carrying a second set of planet gears (393), Preferably, wherein the third sleeve (395) is configured to selectively rotationally connect the second planet carrier (392) to the stationary member (149 a, 149 b), and/or Wherein the second ring gear (394) is rotationally connected to the first planet carrier (142) and the second sun gear (391) is rotationally connected to the first ring gear (144).
  13. 13. Transmission arrangement according to any one of the preceding claims, wherein the output member (81) is a differential carrier (81) of a differential gear set (80) configured to distribute torque to a first drive shaft (89 a) and a second drive shaft (89 b) arranged coaxially with the first planetary gear system (140).
  14. 14. A drivetrain (200, 8200) for an electric vehicle (1), the drivetrain (200, 8200) comprising: -an electric motor (10,810), and -A transmission device (300,9300) according to any one of the preceding claims, wherein the input member (132,8132) of the transmission device is drivingly connected or connectable to the electric motor (10,810).
  15. 15. A vehicle (1) comprising a transmission arrangement (300,9300) according to any one of claims 1 to 13, or a drivetrain (200,8200) according to claim 14.

Description

Transmission device for vehicle Technical Field The present disclosure relates generally to transmission devices. In a particular aspect, the present disclosure relates to a transmission device for a vehicle, a powertrain, and a vehicle. The present disclosure is applicable to heavy vehicles such as trucks, buses, and construction equipment, as well as other vehicle types. The invention is particularly suitable for electric vehicles. Although the present disclosure may be described with respect to a particular vehicle, the present disclosure is not limited to any particular vehicle. Background In recent years, there has been a trend to develop a drivetrain having at least one electric prime mover, i.e., having at least one electric motor to propel a vehicle. For heavy vehicles driven by electric motors, a transmission is needed that is capable of achieving multiple gear states, a large gear ratio across a range, to achieve startability and efficiency at cruising speeds. For launch and creep, the transmission needs to provide a large reduction ratio, while at cruising speeds it is often desirable to use as little gear mesh as possible to reduce power losses and increase range. It is also desirable to provide a compact transmission. In view of this, efforts have been made to develop improved techniques related to electric powertrain systems for vehicles. Disclosure of Invention According to a first aspect of the present disclosure, a transmission device for a vehicle is provided. The transmission device includes: an input member configured to be drivingly connected to an electric motor, A first planetary gear system comprising a first sun gear, a first ring gear, and a first planet carrier carrying a first set of planet gears, wherein the first sun gear and the first ring gear are selectively rotatably connected to the input member by a first sleeve and a second sleeve, respectively, and wherein the first planet carrier is rotatably connected to the output member, A crawler unit (crawler unit) comprising a plurality of gear members, the crawler unit configured to selectively drivingly connect the first ring gear to the output member, Wherein the first sleeve is further configured to selectively rotationally couple the first sun gear to a stationary member of the transmission device, and wherein the second sleeve is further configured to selectively rotationally couple the first ring gear to the stationary member via a third sleeve, Wherein the third sleeve is rotationally coupled to the stationary member, and wherein the third sleeve is further configured to selectively rotationally couple one of the plurality of gear members of the crawler unit to the stationary member to rotate the first ring gear in an opposite direction as compared to a direction of rotation of the first planet carrier. The first aspect may seek to provide, in at least some aspects, an improved transmission arrangement for a vehicle driven by an electric motor. In particular, the present invention seeks to provide a transmission arrangement that is compact and robust and that provides selectable gear ratios over a large range of decelerations. Technical benefits may include a compact transmission device that enables a variety of selectable speed ratios, including large reduction ratios suitable for creep. By the non-rotating third sleeve being rotationally connected to the stationary member (such as to the transmission housing) and the second sleeve being configured to rotationally connect the first ring gear to the stationary member via the third sleeve, a transmission device may be further provided which reduces the risk of inadvertent locking of the gear member due to an inadvertent simultaneous rotational connection with the stationary member. This may increase robustness and facilitate shifting compared to a transmission device in which the second sleeve is configured to directly rotationally connect the first ring gear to the stationary member without using the third sleeve. In the following and throughout the specification, the terms "rotationally connected to" and "rotationally connected to" should be interpreted as a component of the transmission device being connected to another component of the transmission device in such a way that the components are configured to rotate in the same direction and at the same rotational speed. Thus, when these components are rotationally coupled to each other, they will rotate in the same direction and at the same rotational speed, or they will all be prevented from rotating. For example, when the originally rotatable component is rotationally connected to the stationary member, it is prevented from rotating relative to the stationary member. The term "rotatably coupled" should be interpreted as "selectively connectable for common rotation". A "drive connection" of two rotating components is understood to mean that torque can be transmitted between the components and the rotational speed of the